电力系统保护与控制
電力繫統保護與控製
전력계통보호여공제
POWER SYSTM PROTECTION AND CONTROL
2013年
18期
25-31
,共7页
王达达%张少泉%陈晓云%罗艾青%王强钢%谢光莉%周念成
王達達%張少泉%陳曉雲%囉艾青%王彊鋼%謝光莉%週唸成
왕체체%장소천%진효운%라애청%왕강강%사광리%주념성
短路电流%峰值%鼠笼式感应发电机%转速%配网
短路電流%峰值%鼠籠式感應髮電機%轉速%配網
단로전류%봉치%서롱식감응발전궤%전속%배망
short circuit current%peak value%squirrel-cage rotor induction generator%rotor speed%distribution network
短路电流计算是分布式发电接入配网规划和保护的基础。研究感应发电机(IG)的故障暂态特性,利用 IG 静态等值电路推导出配网三相短路时其定子短路电流的解析表达式,进而比较配网近端和远端短路情况下的IG三相短路电流,分析IG转子和定子磁链强制分量比例系数特性,研究 IG 转速变化对其短路电流直流分量和周期分量的影响。根据配网短路故障后IG转速的变化规律,提出IG接入配网的三相短路电流峰值评估方法。采用PSCAD/EMTDC仿真软件中IG的5阶动态模型仿真验证了该方法的正确性。
短路電流計算是分佈式髮電接入配網規劃和保護的基礎。研究感應髮電機(IG)的故障暫態特性,利用 IG 靜態等值電路推導齣配網三相短路時其定子短路電流的解析錶達式,進而比較配網近耑和遠耑短路情況下的IG三相短路電流,分析IG轉子和定子磁鏈彊製分量比例繫數特性,研究 IG 轉速變化對其短路電流直流分量和週期分量的影響。根據配網短路故障後IG轉速的變化規律,提齣IG接入配網的三相短路電流峰值評估方法。採用PSCAD/EMTDC倣真軟件中IG的5階動態模型倣真驗證瞭該方法的正確性。
단로전류계산시분포식발전접입배망규화화보호적기출。연구감응발전궤(IG)적고장잠태특성,이용 IG 정태등치전로추도출배망삼상단로시기정자단로전류적해석표체식,진이비교배망근단화원단단로정황하적IG삼상단로전류,분석IG전자화정자자련강제분량비례계수특성,연구 IG 전속변화대기단로전류직류분량화주기분량적영향。근거배망단로고장후IG전속적변화규률,제출IG접입배망적삼상단로전류봉치평고방법。채용PSCAD/EMTDC방진연건중IG적5계동태모형방진험증료해방법적정학성。
The calculation of short circuit current is an important foundation for fault analysis of power system integrated into distributed generation. Firstly, the transient characteristics of induction generator (IG) are investigated, and the analytic formula of its stator current under three-phase short circuit in distribution network is derived making use of the steady-state equivalent circuit of IG. Then the three-phase short circuit currents of IG are compared and discussed when the short circuit occurs near to and far from it. Subsequently, according to the characteristic of forced component proportion between stator flux and rotor flux of IG, the impacts of its rotor speed on direct-current and periodic components are studied. Finally, an evaluation method to determine the current peak of three-phase short circuit for induction generator in distribution grid is proposed based on the change law of IG rotor speed under the grid fault. The correctness of the proposed method is verified by the fifth electromagnetic transient model of IG in PSCAD/EMTDC simulation software. This work is supported by National Natural Science Foundation of China (No. 51277184).