JP2016526370A - 電流形コンバータの差動保護方法及び継電保護装置 - Google Patents
電流形コンバータの差動保護方法及び継電保護装置 Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/32—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
- H02H3/34—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors of a three-phase system
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/28—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at two spaced portions of a single system, e.g. at opposite ends of one line, at input and output of apparatus
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/28—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at two spaced portions of a single system, e.g. at opposite ends of one line, at input and output of apparatus
- H02H3/30—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at two spaced portions of a single system, e.g. at opposite ends of one line, at input and output of apparatus using pilot wires or other signalling channel
- H02H3/305—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at two spaced portions of a single system, e.g. at opposite ends of one line, at input and output of apparatus using pilot wires or other signalling channel involving current comparison
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
- H02H3/28—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at two spaced portions of a single system, e.g. at opposite ends of one line, at input and output of apparatus
- H02H3/30—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at two spaced portions of a single system, e.g. at opposite ends of one line, at input and output of apparatus using pilot wires or other signalling channel
- H02H3/307—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at two spaced portions of a single system, e.g. at opposite ends of one line, at input and output of apparatus using pilot wires or other signalling channel involving comparison of quantities derived from a plurality of phases, e.g. homopolar quantities; using mixing transformers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/1216—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for AC-AC converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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Abstract
Description
継電保護装置によって、保護対象の電流形コンバータ両側の電流トランスの二次側電流をサンプリングして、引込線側の三相電流iNa、iNb、iNc、及び引出線側の三相電流iMa、iMb、iMcを得るステップと、
前記引込線側の三相電流と前記引出線側の三相電流を整流して、等価の引込線側の入力電流iNと引出線側の出力電流iMを得るステップと、
両側の電流トランスの電流変成比に基づき前記引込線側の入力電流と前記引出線側の出力電流を換算し、過渡差動電流idiffと過渡制動電流iresを得るステップと、
前記過渡差動電流と前記過渡制動電流に基づき差動電流Idiffと制動電流Iresを得るステップと、
前記差動電流Idiffと制動電流Iresに基づき差動保護を実現するステップと、を含む電流形コンバータの差動保護方法。
前記差動電流と前記制動電流により折れ線比率制動特性又は可変勾配比率制動特性に基づき差動保護を実現するステップを含む。
前記引込線側の三相電流と前記引出線側の三相電流を整流して、等価の引込線側の入力電流iNと引出線側の出力電流iMを得るように配置された整流ユニットと、
両側の電流トランスの電流変成比に基づき前記引込線側の入力電流と前記引出線側の出力電流を換算して、過渡差動電流idiffと過渡制動電流iresを得るように配置された第1取得ユニットと、
前記過渡差動電流と前記過渡制動電流に基づき差動電流Idiffと制動電流Iresを得るように配置された第2取得ユニットと、
前記差動電流Idiffと制動電流Iresに基づき差動保護を実現するように配置された差動保護ユニットと、を含む継電保護装置。
(1)電流サンプリング
継電保護装置によって、電流トランスCT2の二次側電流をサンプリングして、引込線側の三相電流(CT電流二次値)データシーケンスiNa(n)、iNb(n)、iNc(n)を得る。また、継電保護装置によって、電流トランスCT4の二次側電流をサンプリングして、引出線側の三相電流(CT電流二次値)データシーケンスiMa(n)、iMb(n)、iMc(n)を得る。符号nはサンプリングシリアル番号を示し、下付きNa、Nb、Ncは引込線側(グリッド側)のa相、b相、c相を示し、下付きMa、Mb、Mcは引出線側のa相、b相、c相を示す。Wはサンプリングデータウィンドウの長さであり、中国の継電保護装置では、通常、Wを24とする。
整流方法は、
(一)、継電保護装置の内部において、ハードウェアの三相整流ブリッジによって、整流後の等価の引込線側の入力電流iNと引出線側の出力電流iMを得るハードウェア整流と、
(二)、まず、サンプリングによって引込線側の三相電流と引出線側の三相電流の値を得、次に、計算によって、等価の引込線側の入力電流iNと引出線側の出力電流iMを得るソフトウェア整流(デジタル整流とも呼ばれる)との2種がある。
上記の等価の両側電流を引算し、下式5によって計算して過渡差動電流を得る。
差動電流と制動電流の計算は、
差動電流、制動電流の計算方法は二つある。
保護対象の電流形コンバータ両側の電流トランスの二次側電流をサンプリングして、引込線側の三相電流iNa、iNb、iNcと、引出線側の三相電流iMa、iMb、iMcを得るように配置されたサンプリングユニットと、
前記引込線側の三相電流と前記引出線側の三相電流を整流して、等価の引込線側の入力電流iNと引出線側の出力電流iMを得るように配置された整流ユニットと、
両側の電流トランスの電流変成比に基づき前記引込線側の入力電流と前記引出線側の出力電流を換算して、過渡差動電流idiffと過渡制動電流iresを得るように配置された第1取得ユニットと、
前記過渡差動電流と前記過渡制動電流に基づき差動電流Idiffと制動電流Iresを得るように配置された第2取得ユニットと、
前記差動電流Idiffと制動電流Iresに基づき差動保護を実現するように配置された差動保護ユニットと、を含む。
前記差動電流と前記制動電流に基づき、折れ線比率制動特性又は可変勾配比率制動特性によって差動保護を実現するように配置された。
Claims (17)
- 継電保護装置によって、保護対象の電流形コンバータ両側の電流トランスの二次側電流をサンプリングして、引込線側の三相電流iNa、iNb、iNc、及び引出線側の三相電流iMa、iMb、iMcを得るステップと、
前記引込線側の三相電流と前記引出線側の三相電流を整流して、等価の引込線側の入力電流iNと引出線側の出力電流iMを得るステップと、
両側の電流トランスの電流変成比に基づき前記引込線側の入力電流と前記引出線側の出力電流を換算し、過渡差動電流idiffと過渡制動電流iresを得るステップと、
前記過渡差動電流と前記過渡制動電流に基づき差動電流Idiffと制動電流Iresを得るステップと、
前記差動電流Idiffと制動電流Iresに基づき差動保護を実現するステップと、を含む電流形コンバータの差動保護方法。 - 前記引込線側の三相電流と引出線側の三相電流を整流して、等価の引込線側の入力電流iNと引出線側の出力電流iMを得るステップは、継電保護装置の内部において、ハードウェアの三相整流ブリッジによってハードウェア整流を行うことで、整流後の等価の引込線側の入力電流iNと引出線側の出力電流iMを得るステップを含む請求項1に記載の電流形コンバータの差動保護方法。
- 前記引込線側の三相電流と引出線側の三相電流を整流して、等価の引込線側の入力電流iNと引出線側の出力電流iMを得るステップは、デジタル整流によって、
- 前記引込線側の三相電流と引出線側の三相電流を整流して、等価の引込線側の入力電流iNと引出線側の出力電流iMを得るステップは、
- 前記両側の電流トランスの電流変成比に基づき前記引込線側の入力電流と前記引出線側の出力電流を換算して、過渡差動電流idiffと過渡制動電流iresを得るステップは、
- 前記過渡差動電流と過渡制動電流に基づき差動電流Idiffと制動電流Iresを得るステップは、
- 前記過渡差動電流と過渡制動電流に基づき差動電流Idiffと制動電流を得るステップは、
二乗平均平方根の関数変換を行って、差動電流Idiffと制動電流Iresを得るステップを含む(ただし、n又はkはサンプリングシリアル番号を示し、Wはデータウィンドウの長さである)請求項1に記載の電流形コンバータの差動保護方法。 - 差動電流Idiffと制動電流Iresに基づき差動保護を実現するステップは、
前記差動電流と前記制動電流により、折れ線比率制動特性又は可変勾配比率制動特性に基づき差動保護を実現するステップを含む請求項1〜7のいずれかに記載の電流形コンバータの差動保護方法。 - Idiff+とIres+により1組の差動電流と制動電流を構成し、Idiff−とIres−により1組の差動電流と制動電流を構成し、IdiffとIresにより1組の差動電流と制動電流を構成する請求項6に記載の電流形コンバータの差動保護方法。
- 保護対象の電流形コンバータ両側の電流トランスの二次側電流をサンプリングして、引込線側の三相電流iNa、iNb、iNc、及び引出線側の三相電流iMa、iMb、iMcを得るように配置されたサンプリングユニットと、
前記引込線側の三相電流と前記引出線側の三相電流を整流して、等価の引込線側の入力電流iNと引出線側の出力電流iMを得るように配置された整流ユニットと、
両側の電流トランスの電流変成比に基づき前記引込線側の入力電流と前記引出線側の出力電流を換算して、過渡差動電流idiffと過渡制動電流iresを得るように配置された第1取得ユニットと、
前記過渡差動電流と前記過渡制動電流に基づき差動電流Idiffと制動電流Iresを得るように配置された第2取得ユニットと、
前記差動電流Idiffと制動電流Iresに基づき差動保護を実現するように配置された差動保護ユニットと、を含む継電保護装置。 - 前記整流ユニットは、
継電保護装置の内部において、ハードウェアの三相整流ブリッジによって、ハードウェア整流を行うことで、整流後の等価の引込線側の入力電流iNと引出線側の出力電流iMを得るように配置された請求項10に記載の継電保護装置。 - 前記整流ユニットは、
デジタル整流によって、
- 前記整流ユニットは、
- 前記第1取得ユニットは、
- 前記第2取得ユニットは、
- 前記第2取得ユニットは、
- 前記差動保護ユニットは、
前記差動電流と前記制動電流により、折れ線比率制動特性又は可変勾配比率制動特性に基づき差動保護を実現するように配置された請求項10〜16のいずれかに記載の継電保護装置。
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PCT/CN2014/075267 WO2014190814A1 (zh) | 2013-05-30 | 2014-04-14 | 电流源型变流器差动保护方法及继电保护装置 |
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