DS-information DS/IEC TS 62578:2015
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1 DS-information DS/IEC TS 62578: udgave Effektelektroniske systemer og udstyr Driftsbetingelser og karakteristika for aktive nettilkoblede konvertere (AIC), inklusive konstruktionsmæssige anbefalinger for emissionsværdier under 150 khz Power electronics systems and equipment Operation conditions and characteristics of active infeed converter (AIC) applications including design recommendations for their emission values below 150 khz
2 DS/IEC TS 62578:2015 København DS projekt: M ICS: Første del af denne publikations betegnelse er: DS/IEC TS, hvilket betyder, at det er en international teknisk specifikation, der har status som DS-information. Denne publikations overensstemmelse er: IDT med: IEC TS 62578:2015. DS-publikationen er på engelsk. Denne publikation erstatter: DS/IEC/TS 62578:2009. DS-publikationstyper Dansk Standard udgiver forskellige publikationstyper. Typen på denne publikation fremgår af forsiden. Der kan være tale om: Dansk standard standard, der er udarbejdet på nationalt niveau, eller som er baseret på et andet lands nationale standard, eller standard, der er udarbejdet på internationalt og/eller europæisk niveau, og som har fået status som dansk standard DS-information publikation, der er udarbejdet på nationalt niveau, og som ikke har opnået status som standard, eller publikation, der er udarbejdet på internationalt og/eller europæisk niveau, og som ikke har fået status som standard, fx en teknisk rapport, eller europæisk præstandard DS-håndbog samling af standarder, eventuelt suppleret med informativt materiale DS-hæfte publikation med informativt materiale Til disse publikationstyper kan endvidere udgives tillæg og rettelsesblade DS-publikationsform Publikationstyperne udgives i forskellig form som henholdsvis fuldtekstpublikation (publikationen er trykt i sin helhed) godkendelsesblad (publikationen leveres i kopi med et trykt DS-omslag) elektronisk (publikationen leveres på et elektronisk medie) DS-betegnelse Alle DS-publikationers betegnelse begynder med DS efterfulgt af et eller flere præfikser og et nr., fx DS 383, DS/EN 5414 osv. Hvis der efter nr. er angivet et A eller Cor, betyder det, enten at det er et tillæg eller et rettelsesblad til hovedstandarden, eller at det er indført i hovedstandarden. DS-betegnelse angives på forsiden. Overensstemmelse med anden publikation: Overensstemmelse kan enten være IDT, EQV, NEQ eller MOD IDT: Når publikationen er identisk med en given publikation. EQV: Når publikationen teknisk er i overensstemmelse med en given publikation, men præsentationen er ændret. NEQ: Når publikationen teknisk eller præsentationsmæssigt ikke er i overensstemmelse med en given standard, men udarbejdet på baggrund af denne. MOD: Når publikationen er modificeret i forhold til en given publikation.
3 TECHNICAL SPECIFICATION SPECIFICATION TECHNIQUE IEC TS Edition colour inside Power electronics systems and equipment Operation conditions and characteristics of active infeed converter (AIC) applications including design recommendations for their emission values below 150 khz Systèmes et équipements électroniques de puissance Conditions de fonctionnement et caractéristiques des convertisseurs à alimentation active (AIC), y compris les recommandations de conception pour leurs valeurs d'émission inférieures à 150 khz IEC TS 62578: (en-fr)
4 2 IEC TS 62578:2015 IEC 2015 CONTENTS FOREWORD... 9 INTRODUCTION Scope Normative references Terms and definitions General system characteristics of PWM active infeed converters connected to the power supply network General Basic topologies and operating principles General Operating principles Equivalent circuit of an AIC Filters Pulse patterns Control methods Control of current components Active power factor correction AIC rating General Converter rating under sinusoidal conditions Converter rating in case of harmonic currents Converter rating under dynamic conditions Electromagnetic compatibility (EMC) considerations for the use of AICs General Low-frequency phenomena (<150 khz) General Emerging converter topologies and their advantages for the power supply network Active equalizing of the power supply network Measured power supply network impedances in the range between 2 khz to 20 khz Proposal of an appropriate line impedance stabilisation network (LISN) from 2 khz to 9 khz Effects on industrial equipment in the frequency band 2 khz to 9 khz High-frequency phenomena (> 150 khz) General Mitigation of distortion Immunity EMI filters Audible noise effects Leakage currents Aspects of system integration and dedicated tests Characteristics of a PWM active infeed converter of voltage source type and two level topology General General function, basic circuit topologies... 46
5 IEC TS 62578:2015 IEC Power control Dynamic performance Desired non-sinusoidal line currents Undesired non-sinusoidal line currents Availability and system aspects Operation in active filter mode Characteristics of a PWM active infeed converter of voltage source type and three level topology General function, basic circuit topologies Power control Dynamic performance Undesired non-sinusoidal line currents Availability and system aspects Characteristics of a PWM Active Infeed Converter of Voltage Source Type and Multi Level Topology General function, basic circuit topologies Power control Dynamic performance Power supply network distortion Availability and system aspects Characteristics of a F3E AIC of the Voltage Source Type General function, basic circuit topologies Power control and line side filter Dynamic performance Harmonic current Characteristics of an AIC of Voltage Source Type in Pulse Chopper Topology General General function, basic circuit topologies Desired non-sinusoidal line current Undesired non-sinusoidal line current Reliability Performance Availability and system aspects Characteristics of a two level PWM AIC of current source type (CSC) General General function, basic converter connections Power control Dynamic performance Line current distortion Operation in active filter mode Availability and system aspects Annex A (informative) A.1 Control methods for AICs in VSC (Voltage Source Converter) topology A.1.1 General A.1.2 Considerations of control methods A.1.3 Short-circuit ride through functionality for decentralized power infeed with AIC A.1.4 Fault ride through mode... 70
6 4 IEC TS 62578:2015 IEC 2015 A.2 Examples of practical realized AIC applications A.2.1 AIC of current source type (CSC) A.2.2 Active infeed converter with commutation on the d.c. side (reactive power converter) A.3 Details concerning two level and multi-level AICs in VSC Topology A.3.1 Properties of active infeed converters (PWM) with different number of levels A.3.2 Examples of typical waveforms of AICs A.3.3 Construction and realization A.4 Basic transfer rules between voltage and current distortion of an AIC A.5 Examples of the influence of AICs to the voltage quality A.6 Withstand capability of power capacitors towards distortion in the range of 2 khz to 9 khz A.6.1 General A.6.2 Catalogue information about permissible harmonic load A.6.3 Frequency boundaries for permissible distortion levels A.6.4 Frequency spectrum of active infeed converters A.6.5 Conclusion A.7 Impact of additional AIC filter measures in the range of 2 khz to 9 khz A.7.1 General A.7.2 Example of a PDS constellation (AIC and CSI) A.7.3 Conclusion A.8 Example of the power supply network impedance measurement A.8.1 General A.8.2 Basic principle of measurement A.8.3 Harmonic component injection methods for measurement A.8.4 Harmonic current generation by disturbing device A.8.5 References based on current injection by disturbance (Method A) A.8.6 References based on sinusoidal single frequency injection (Method B) Annex B (informative) B.1 Basic considerations for design recommendations of AICs in the range of 2 khz to 9 khz B.1.1 Overview B.1.2 General B.1.3 Withstand capability of power capacitors connected to the power supply network and recommendation for the compatibility in the frequency range 2 khz to 9 khz B.1.4 Basic conditions for setting the capacitor withstand capability curve B.1.5 Matching of AIC converters (2-Level PWM) to different power supply network conditions without overloading the power capacitor burden B.1.6 Considerations in regard to medium voltage power supply networks B.1.7 AIC filtering considerations B.1.8 AIC appropriate technical and economical amount B.1.9 Frequency range from 2 khz to 9 khz B.2 Design recommendations for conducted emission of low voltage AICs in the reasonable context of higher frequencies between 9 khz and 150 khz B.2.1 General B.2.2 Data collection results B.2.3 Conclusions Bibliography
7 IEC TS 62578:2015 IEC Figure 1 AIC in VSC topology, basic structure Figure 2 AIC in CSC topology, basic structure Figure 3 Equivalent circuit for the interaction of the power supply network with an AIC Figure 4 Voltage and current vectors of line and converter at fundamental frequency for different load conditions Figure 5 The basic issues of EMC as tools of economics Figure 6 Typical power supply network current i L (t) and voltage u LN (t) of a phase controlled converter with d.c. output and inductive smoothing Figure 7 Typical power supply network current i L (t) and voltage u LN (t) of an uncontrolled converter with d.c. output and capacitive smoothing Figure 8 Typical power supply network current i L (t) and voltage u LN (t) of an AIC realized by a PWM Converter with capacitive smoothing without additional filters Figure 9 Example of attainable active and reactive power of the AIC (VSC-type) at different line to line voltages in per unit (with 10 % combined transformer and filter inductor short-circuit voltage, X/R ratio = 10/1, d.c. voltage = 6,5 kv) Figure 10 Principle of compensating given harmonics in the power supply system by using an AIC and suitable control simultaneously Figure 11 Typical Voltage Distortion in the Line-to-Line and Line-to-Neutral Voltage generated by an AIC without additional filters (u in % and t in degrees) Figure 12 Basic characteristic of the relative voltage distortion (59th harmonic) of one AIC operated at a pulse frequency of 3 khz versus R SCe with the line impedance according to Figure 13 Basic characteristic of the relative current emission (59th harmonic) of one AIC at a pulse frequency of 3 khz versus R SCe with the line impedance according to Figure 14 Single phase electric circuit of the three commonly used differential mode passive line filter topologies for VSC and one example for passive damping Figure 15 Example of the attenuation of the VSC line to line voltage to the line to line voltage at the IPC with state of the art differential mode passive line filter topologies Figure 16 Connection of the power supply network impedance measurement equipment Figure 17 Example of the measured impedance of a low-voltage transformer under no load condition S = 630 kva, u k = 6,08 % Figure 18 Measured variation of the power supply network impedance over the course of a day at one location Figure 19 Power supply network impedance with partly negative imaginary part Figure 20 Distribution of power system impedance (measured between phase and neutral conductor) in low-voltage systems versus frequency Figure 21 Statistical distribution of positive-sequence impedance versus frequency in low-voltage power supply networks Figure 22 Equivalent circuit describing the power supply network impedance Figure 23 Circuit topology for power system simulation Figure 24 Approximated and measured 50 % impedance curve Figure 25 Single phase circuit topology according to IEC used for line impedance stabilisation network Figure 26 Three-phase circuit topology for the line impedance stabilisation network Figure 27 Impedance variation in the 90 % curve of the LISN described in Figure Figure 28 PDS with large d.c. capacitance... 43
8 6 IEC TS 62578:2015 IEC 2015 Figure 29 PDS with large capacitance and line inductor Figure 30 PDS with a large d.c. capacitance and inductors in the d.c. link Figure 31 Basic EMI filter topology Figure 32 Block diagram of a PDS with high frequency EMI filter system Figure 33 Basic illustration of a topology of a two level PWM voltage source AIC Figure 34 Typical waveforms of voltages u S1N / U LN, 1 and voltage u S12 / U LN, 1 at pulse frequency of 4 khz Figure 35 Typical waveforms of the common mode voltage u CM / U LN,1 at pulse frequency of 4 khz. Power supply frequency is 50Hz Figure 36 Waveform of the current i L1 / I equ at pulse frequency of 4 khz, relative impedance of u SCV,equ = 6 % Figure 37 Block diagram of a two level PWM AIC Figure 38 Distortion of the current i L1 of reactance X equ, pulse frequency: 4 khz, relative reactance of u SCV,equ = 6 % Figure 39 Typical voltages u L1N / U LN, 1 and u L12 / U LN, 1 at pulse frequency of 4 khz, relative reactance u SCV,equ = 6 %, R SCe = Figure 40 Basic topology of a three level AIC. For a Power Drive System (PDS) the same topology may be used also on the load side Figure 41 Typical curve shape of the phase-to-phase voltage of a three level PWM converter Figure 42 Example of a sudden load change of a 13 MW three level converter where the current control achieves a response time within 5 ms Figure 43 Typical topology of a flying capacitor (FC) four level AIC using IGBTs Figure 44 Typical curve shape of the phase-to-phase voltage of a multi-(four)- level AIC Figure 45 Distorting frequencies and amplitudes in the line voltage (measured directly at the bridge terminals in Figure 25 and the line current of a multilevel (four) AIC (transformer with 10 % short-circuit voltage) Figure 46 Topology of a F3E AIC Figure 47 Line side filter and equivalent circuit for the F3E-converter behaviour for the power supply network Figure 48 Current transfer function together with R SCe = 100 and R SCe = 750 and a line side filter: G(f) = i L1 / i conv Figure 49 PWM voltage distortion over power supply network impedance for F3Einfeed including power supply network side filter Figure 50 Input current spectrum of a 75kW-F3E-converter Figure 51 Harmonic spectrum of the input current of an F3E-converter with R SCe = Figure 52 An illustration of a distortion effect caused by a single phase converter with capacitive load Figure 53 a.c. to a.c. AIC pulse chopper, basic circuit Figure 54 Illustration of a converter topology for a current source AIC Figure 55 Typical waveforms of currents and voltages of a current source AIC with high switching frequency Figure 56 Typical block diagram of a current source PWM AIC Figure 57 Current source AIC used as an active filter to compensate the harmonic currents generated by a nonlinear load Figure 58 Step response (reference value and actual value) of current source AIC with low switching frequency [33]... 68
9 IEC TS 62578:2015 IEC Figure A.1 Principle sketch for combined voltage- and current-injecting modulation example for phase leg R Figure A.2 Example for controlled phase current during a voltage dip at the power supply network using hysteresis plus PWM control Figure A.3 Typical waveforms of electrical power supply network current and voltage for a current source AIC with low switching frequency [33] Figure A.4 Currents and voltages in a (semiconductor) valve device of an AIC and a machine side converter both of the current source with low pulse frequency [33] Figure A.5 Total harmonic distortion of electrical power supply network and motor current [33] remains always below 8 % (triangles in straight line) in this application Figure A.6 Basic topology of an AIC with commutation on the d.c. side (six pulse variant) Figure A.7 Dynamic performance of a reactive power converter Figure A.8 Line side current for a twelve pulse Reactive Power Converter in a capacitive and inductive operation mode (u SCV,equ = 15 %) Figure A.9 The origin of the current waveform of a RPC by the line voltage (sinusoidal) and the converter voltage (rectangular) Figure A.10 Two level topology with nominal voltage of maximum V and timescale of 5 ms/div Figure A.11 Three level topology with nominal voltage of maximum V and timescale of 5 ms/div Figure A.12 Four level topology with nominal voltage of maximum V and timescale of 5 ms/div Figure A.13 General influence of significant characteristics to the voltage distortion and current distortion Figure A.14 Measured reduction of voltage distortion when four AICs are connected to the power supply network Figure A.15 Excerpts from a catalogue information of a power capacitor manufacturer; 760 V AC; (rated voltage: 690 V AC) for temperature calculation Figure A.16 Reactive power and losses of a power capacitor supplied by a source with constant reference voltage and variable frequency (R cp = f(h)) Figure A.17 Apparent power and losses of a typical power capacitor at different voltage distortion levels and the critical frequency boundaries (at singular frequency) where the temperature rise reaches substantial values (vertical arrows) Figure A.18 Voltage spectrum of an AIC and the impact of a line impedance reduction to the temperature of the capacitor (from 10 K to 0,44 K) and the composition of the spectrum Figure A.19 A wind turbine plant and a mine winder drive connected on the same power line Figure A.20 Power supply network configuration for the plant of Figure A.19 with allocated measurement points Figure A.21 Regular current of the CSI (AIC-filter disabled) and amplification of the current in case of resonance caused by the AIC-filter circuit (when AIC filter is enabled) Figure A.22 Basic principle of impedance measurement Figure A.23 Harmonic current generation by disturbing device Figure A.24 Measurement by switching a resistor Figure A.25 Measurement by a capacitor bank Figure A.26 A 6,6 kv power supply network impedance measurement system for islanding detection by injecting interharmonics... 92
10 8 IEC TS 62578:2015 IEC 2015 Figure B.1 Withstand capability level towards harmonic voltages in the power supply network in view of permissible temperature rise within capacitors if the voltage distortion is determined either by one predominating frequency (upper line) or if the distortion is predominantly determined by a harmonic spectrum, caused by several parallel operated AICs (2-Level PWM) (lower line) Figure B.2 Harmonic voltage spectrum of one 2-Level PWM AIC with acceptable temperature increase of a power capacitor not exceeding 10 K Figure B.3 Maximum voltage distortion of a spectrum, caused by several AICs (single phase topologies) Figure B.4 Maximum voltage distortion of a spectrum, caused by several AICs (three phases topologies) Figure B.5 Spreadsheet of matching single phase AICs (2-level) to different power supply network conditions in order to apply the power capacitor limit curves Figure B.6 Spreadsheet of matching three phases AICs (2-level) to different power supply network conditions in order to apply the power capacitor limit curves Figure B.7 Illustration of the typical power supply network resonance frequency by increasing AIC filtering population, versus the voltage distortion level Figure B.8 Sketch of the typical size/cost of an AIC application versus switching frequency of the AIC Figure B.9 Illustration of the probability of overload and stress problems for the power supply network and the equipment connected thereto, depending on stipulated distortion levels fixed in miscellaneous assumptions Figure B.10 Results of the data collection versus the maximum values proposed in the IEC TS for products rated above 75 kva Figure B.11 Results of the data collection versus the maximum values proposed in the IEC TS for products rated below 75 kva Figure B.12 Results of the data collection versus the maximum values proposed in the IEC TS for products rated above 75 kva Figure B.13 Recommended maximum emission values for AIC of different categories in the range from 9 khz up to 150 khz Table 1 Parameters of line impedance stabilisation network for different power system impedance curves Table 2 Parameters of the LISN described in Figure 25 and Figure Table A.1 Condition state 1: positive current limit reached, transistor T1 is switch-off to reduce the current Table A.2 Condition state 2: negative current limit reached, transistor T2 is switch-off to reduce the current Table A.3 Condition state 0: current in phase R within tolerance range, pure voltage injection active (e.g. with PWM) Table A.4 Comparison of different PWM AICs of VSC topology Table A.5 Voltage distortion on both power lines (II and III) without and with filter circuit (the filter had been designed to achieve 0,2 % distortion level on the MV-power line) Table A.6 Current distribution within the network described for specific frequencies and on allocated measurement points as pointed out in Figure A Table B.1 AIC design recommendation for a maximum distortion factor in the frequency range from 2 to 9 khz Table B.2 Recommended maximum emission values for AIC of different categories in the range from 9 khz up to 150 khz
11 IEC TS 62578:2015 IEC INTERNATIONAL ELECTROTECHNICAL COMMISSION POWER ELECTRONICS SYSTEMS AND EQUIPMENT Operation conditions and characteristics of active infeed converter (AIC) applications including design recommendations for their emission values below 150 khz FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as IEC Publication(s) ). Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with may participate in this preparatory work. International, governmental and nongovernmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for Standardization (ISO) in accordance with conditions determined by agreement between the two organizations. 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international consensus of opinion on the relevant subjects since each technical committee has representation from all interested IEC National Committees. 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any misinterpretation by any end user. 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications transparently to the maximum extent possible in their national and regional publications. Any divergence between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter. 5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any services carried out by independent certification bodies. 6) All users should ensure that they have the latest edition of this publication. 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and members of its technical committees and IEC National Committees for any personal injury, property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications. 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. The main task of IEC technical committees is to prepare International Standards. In exceptional circumstances, a technical committee may propose the publication of a technical specification when the required support cannot be obtained for the publication of an International Standard, despite repeated efforts, or The subject is still under technical development or where, for any other reason, there is the future but no immediate possibility of an agreement on an International Standard. Technical specifications are subject to review within three years of publication to decide whether they can be transformed into International Standards. IEC TS 62578, which is a technical specification, has been prepared by IEC technical committee TC 22: Power electronic systems and equipment.
12 10 IEC TS 62578:2015 IEC 2015 This second edition cancels and replaces the first edition published in This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) IEC TS 62578, in its revised version includes observed values out of practical applications for emission values below 150 khz. b) Therefore the document has been extended compared to the first edition, several detailed analysis results are given in the extended Annexes. c) Design recommendations have been derived from the international working group by an assessment of the power supply impedances between 2 khz and 9 khz, a comprehensive analysis of the withstand capability of power capacitors against harmonic currents injected by AIC, immunity tests of equipment and considerations about shifted resonances in the power supply network with increased population of undamped filter capacitors. The text of this technical specification is based on the following documents: Enquiry draft 22/235/DTS Report on voting 22/239/RVC Full information on the voting for the approval of this technical specification can be found in the report on voting indicated in the above table. The French version of this technical specification has not been voted upon. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. The committee has decided that the contents of this publication will remain unchanged until the stability date indicated on the IEC web site under " in the data related to the specific publication. At this date, the publication will be transformed into an International standard, reconfirmed, withdrawn, replaced by a revised edition, or amended. IMPORTANT The 'colour inside' logo on the cover page of this publication indicates that it contains colours which are considered to be useful for the correct understanding of its contents. Users should therefore print this document using a colour printer.
13 IEC TS 62578:2015 IEC INTRODUCTION This revision of the technical specification IEC TS is necessary because active infeed converters (AIC) are a state of the art technology in power electronic products and will be of major importance in order to realize the "smart grid" and the "energy efficiency" initiatives. AICs in industrial and domestic use are necessary to feedback energy from an energy source (e.g. solar panels, fuel cells or wind turbines) or from a motor load to the power supply network and make it available for other consumers instead of dissipating it as a waste-heat to the environment. Dispersed power generating equipment uses AICs to synchronise their voltages and currents to the power supply network or to exchange electrical energy between energy storage devices such as batteries and consumers. Utilities will require information on how to correctly apply the AICs in order to mitigate harmonics in the power supply network. AICs can also be used to mitigate pre-existing harmonics in the supply system information on this is of interest to utilities. Different possible topologies of AICs are described together with their specific advantages. Warning: The recommendations of maximum emission values for conducted emissions <150 khz defined in this document are based on observations and experience gained from state of the art AICs operating today in most power supply networks together with other equipment without creating intolerable interference and should lead to an increased acceptance of using AICs. Nevertheless it has to be highlighted that electromagnetic environment is subject to changes e.g. because of smart grid deployment and that emission limits that are currently under development by the IEC EMC Committees may be different to the maximum emission values recommended in this document. This document is being issued in the Technical Specification series of publications (according to the ISO/IEC Directives, Part 1, ) as a prospective standard for provisional application in the field of power electronics because there is an urgent need for guidance on the design and use of active infeed converters (AIC) today and in smart grid environments. It remains unclear during revision of this document, how and when the smart grid vision will be realized and to what extent in the future. AICs will be the "key link components" if several electrical energy storage devices or storage technologies and energy users are to be connected together and will interact under "smart grid behaviour" conditions. The power supply network may adapt its future characteristics compared to the state of the art while increasing the installed density of AIC.
14 12 IEC TS 62578:2015 IEC 2015 POWER ELECTRONICS SYSTEMS AND EQUIPMENT Operation conditions and characteristics of active infeed converter (AIC) applications including design recommendations for their emission values below 150 khz 1 Scope This Technical Specification IEC TS describes the operation conditions and typical characteristics of active infeed converters (AIC) of all technologies and topologies which can be connected between the electrical power supply network (lines) a.c. side and a constant current or voltage type d.c. side and which can convert electrical power (active and reactive) in both directions (generative or regenerative). Applications with active infeed converters are commonly used with the d.c. sides of adjustable speed power drive systems (PDS), uninterruptible power systems (UPS), active filters, photovoltaic systems, wind turbine systems, battery backed power management systems etc. of all voltages and power ratings. Active infeed converters are generally connected between the electrical power supply network (a.c. side) and a current or voltage d.c. side, with the objective to avoid emitting low frequency harmonics (e.g. less than 1 khz) by synthesizing a sinusoidal a.c. current. Some of them can additionally compensate the pre-existing harmonic distortion of a given supply side voltage. They are moreover able to control the power factor of a power supply network section by moving the electrical power (active and reactive) in both directions (generative or regenerative), which enables energy saving in the system and stabilizes the power supply voltage or enables coupling of renewable energy sources or electrical energy storage devices to the supply. A practical and analytical approach for emission values for AICs in power supply networks is given, which is based on the latest results for line impedance values between 2 khz and 9 khz and withstand capability of capacitors connected directly to the supply. This results in design recommendations for emission values below 150 khz. The following is excluded from the scope. Requirements for the design, development or further functionality of active infeed applications. Probability of interactions or influences of the AIC with other equipment caused by parasitic elements in an installation or caused by poor electronic design as well as their mitigations. "Overhead line" power supply networks because of lack of information (measurements) of their three phase impedances. This could be the subject for future editions. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
15 IEC TS 62578:2015 IEC IEC (all parts), International Electrotechnical Vocabulary (available at IEC TR 60725:2012, Consideration of reference impedances and public supply network impedances for use in determining the disturbance characteristics of electrical equipment having a rated current 75 A per phase IEC , Adjustable speed electrical power drive systems Part 3: EMC requirements and specific test methods IEC , Adjustable speed electrical power drive systems Part 5-1: Safety requirements Electrical, thermal and energy IEC , Uninterruptible power systems (UPS) Part 1: General and safety requirements for UPS IEC 62103, Electronic equipment for use in power installations IEC :2002, Electromagnetic compatibility (EMC) Part 4-7: Testing and measurement techniques General guide on harmonics and interharmonics measurements and instrumentation, for power supply systems and equipment connected thereto IEC :2002/AMD1:2008 CISPR , Radio disturbance and immunity measuring apparatus Measuring apparatus 3 Terms and definitions For the purposes of this document, the terms and definitions given in IEC and the following apply 3.1 active equalization of the power supply network AEP ability of an AIC to enable and combine smart grid functionalities with a specific main application Note 1 to entry: Specific main applications include: reduce or avoid emitting low frequency harmonics (e.g. less than 2 khz) from the power supply network by synthesizing a sinusoidal line current contributes to controlling the reactive power of a power supply network exchanging the electrical power (active and reactive) in generative or regenerative modes stabilization of the power supply voltage and energy saving in the supply system exchanging electrical energy between power supply networks or other power generations applications like fuel cells and electrical energy storage devices coupling of decentralized power sources (e.g. from renewable energy) to the power supply network. 3.2 a.c. filter filter consisting of passive components, such as inductors, capacitors and resistors connected to the a.c. side of a converter, designed to reduce the circulation of harmonic currents in the associated system 3.3 active filter AIC operating as a filter to control the specific a.c. side harmonic and interharmonics voltages or currents usually without active power flow
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