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
13期
93-96
,共4页
三相不对称系统%任意次谐波电流%检测%锁相环%仿真
三相不對稱繫統%任意次諧波電流%檢測%鎖相環%倣真
삼상불대칭계통%임의차해파전류%검측%쇄상배%방진
unbalanced three phase system%random harmonic current%detection%phase lock loop%simulation
提出了在三相不对称系统下，一种新的检测任意次谐波电流的方法。该方法通过构造任意初相角、具备与需要检测的任意次谐波相同频率的正弦信号和余弦信号，使其与三相电流进行相关运算，可分别检测出任意次谐波电流正序分量、负序分量和零序分量，将三种分量相加即可得到三相四线制系统任意次谐波电流的检测结果。该方法不存在锁相环电路，简化了电路结构。理论分析和仿真结果都证明了所提方法的正确性。
提齣瞭在三相不對稱繫統下，一種新的檢測任意次諧波電流的方法。該方法通過構造任意初相角、具備與需要檢測的任意次諧波相同頻率的正絃信號和餘絃信號，使其與三相電流進行相關運算，可分彆檢測齣任意次諧波電流正序分量、負序分量和零序分量，將三種分量相加即可得到三相四線製繫統任意次諧波電流的檢測結果。該方法不存在鎖相環電路，簡化瞭電路結構。理論分析和倣真結果都證明瞭所提方法的正確性。
제출료재삼상불대칭계통하，일충신적검측임의차해파전류적방법。해방법통과구조임의초상각、구비여수요검측적임의차해파상동빈솔적정현신호화여현신호，사기여삼상전류진행상관운산，가분별검측출임의차해파전류정서분량、부서분량화령서분량，장삼충분량상가즉가득도삼상사선제계통임의차해파전류적검측결과。해방법불존재쇄상배전로，간화료전로결구。이론분석화방진결과도증명료소제방법적정학성。
A new algorithm for detecting random harmonic current in unbalanced three phase system is proposed. An arbitrary initial phase angle is constructed, whose sine and cosine signals have the same frequency with the random harmonic current needed to be detected. It is used to conduct correlation operation with three phase current, and the components of positive, negative and zero sequences of random harmonic current can be detected. By adding the three components, the random harmonic current of three-phase four-wire system can be obtained. Without phase lock loop, the circuit is simpler. Both the theoretical analysis and simulation results demonstrate the correctness of the method.
