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
16期
78-84
,共7页
电气化铁路%功率平衡装置%基波电压检测%同步检测法%谐波及负序电流补偿
電氣化鐵路%功率平衡裝置%基波電壓檢測%同步檢測法%諧波及負序電流補償
전기화철로%공솔평형장치%기파전압검측%동보검측법%해파급부서전류보상
electrified railway%power balance device%fundamental voltage detection%synchronous detection method%harmonic and negative sequence current compensation
针对平衡变压器供电方式下,高速电气化铁道谐波、负序电流引起的电压畸变,指令电流检测过程复杂、延时较长,结果含有误差的缺点,提出了一种无需锁相环电路快速准确地提取指令电流的方法。该方法通过简单的数乘运算提取基波电压,运用同步检测法来准确地检测出指令电流信号的方法,使两供电臂功率平衡,电流对称且与供电臂基波电压同相位,消除无功、谐波及负序电流对三相电力系统的影响。相比传统的带锁相环,基于鉴相原理和瞬时无功功率理论的检测方法,该方法更加简便易行,运算速度更快,且不受电网畸变条件的影响。通过仿真分析,验证了该检测方法在电气化牵引供电系统电压畸变条件下运用的正确性和可行性。
針對平衡變壓器供電方式下,高速電氣化鐵道諧波、負序電流引起的電壓畸變,指令電流檢測過程複雜、延時較長,結果含有誤差的缺點,提齣瞭一種無需鎖相環電路快速準確地提取指令電流的方法。該方法通過簡單的數乘運算提取基波電壓,運用同步檢測法來準確地檢測齣指令電流信號的方法,使兩供電臂功率平衡,電流對稱且與供電臂基波電壓同相位,消除無功、諧波及負序電流對三相電力繫統的影響。相比傳統的帶鎖相環,基于鑒相原理和瞬時無功功率理論的檢測方法,該方法更加簡便易行,運算速度更快,且不受電網畸變條件的影響。通過倣真分析,驗證瞭該檢測方法在電氣化牽引供電繫統電壓畸變條件下運用的正確性和可行性。
침대평형변압기공전방식하,고속전기화철도해파、부서전류인기적전압기변,지령전류검측과정복잡、연시교장,결과함유오차적결점,제출료일충무수쇄상배전로쾌속준학지제취지령전류적방법。해방법통과간단적수승운산제취기파전압,운용동보검측법래준학지검측출지령전류신호적방법,사량공전비공솔평형,전류대칭차여공전비기파전압동상위,소제무공、해파급부서전류대삼상전력계통적영향。상비전통적대쇄상배,기우감상원리화순시무공공솔이론적검측방법,해방법경가간편역행,운산속도경쾌,차불수전망기변조건적영향。통과방진분석,험증료해검측방법재전기화견인공전계통전압기변조건하운용적정학성화가행성。
Aiming at the shortcoming of voltage distortion caused by high-speed electrified railway harmonic and negative sequence current and the complexity and longer delay of command current detection process leading to results containing error under balance transformer power supply, this paper proposes a fast and accurate method to extract the instruction current without phase-locked loop circuit. The method extracts fundamental voltage by a simple number multiplication, and uses synchronous detection method to accurately detect the command current signal and to balance the power of two supply arms, make current symmetrical and phased with fundamental voltage of the supply arm, eliminating the effects of reactive power, harmonic and negative-sequence current on three-phase power system. Compared with traditional detection method with phase-locked loop based on principle of phase and instantaneous reactive power theory, this method is simpler and faster, and not subject to the effect of grid distortion. Simulation analysis verifies the correctness and feasibility of the detection method in the electrified traction power supply system voltage distortion.