CAJ | 학술논문

配电网中三相负载不对称，会导致三相电流电压不对称。基于瞬时对称分量法对三相电压和电流量进行分解，提出了一种新的正序、负序和零序电流直接控制方法，应用于三相四线制配电网并联型D-STATCOM （配电网静止同步无功发生器）。正序电流控制使D-STATCOM发出电网中需要补偿的无功电流和谐波电流；负序、零序电流由abc坐标系转换到 dq0同步旋转坐标系与期望值0做差进行控制，用以补偿三相负荷不平衡。仿真结果表明，所提出的控制方法可以使D-STATCOM有效补偿配电网三相负荷不平衡，提高配电网功率因数，同时消除非线性负荷引起的电流畸变。
배전망중삼상부재불대칭，회도치삼상전류전압불대칭。기우순시대칭분량법대삼상전압화전류량진행분해，제출료일충신적정서、부서화령서전류직접공제방법，응용우삼상사선제배전망병련형D-STATCOM （배전망정지동보무공발생기）。정서전류공제사D-STATCOM발출전망중수요보상적무공전류화해파전류；부서、령서전류유abc좌표계전환도 dq0동보선전좌표계여기망치0주차진행공제，용이보상삼상부하불평형。방진결과표명，소제출적공제방법가이사D-STATCOM유효보상배전망삼상부하불평형，제고배전망공솔인수，동시소제비선성부하인기적전류기변。
The difference of three-phase load leads to the unbalance of three-phase voltage and current.Using the instantaneous symmetrical component method to decompose three-phase voltage and current, the paper proposes a new positive, negative and zero sequence direct current control method, which is mainly applied to the three-phase four-wire system that parallels D-STATCOM in the distribution network.The positive sequence current control is used to make the D -STATCOM generate reactive and harmonic current that needs to be compensated in the grid.Negative and zero sequence current is transformed from the abc coordinate system to the dq0 synchronous rotating coordinate system, and is subtracted with the expected value 0 to maintain the three -phase current bal-ance.Simulation results show that the proposed control strategy can effectively compensate the three-phase load un-balance and improve power factor at the line side, meanwhile eliminate current distortion caused by nonlinear load.