【摘要】 针对大容量冲击性负荷所带来的不对称、电压波动和闪变等电能质量问题,提出了基于变压器隔离型链式逆变器的D-STATCOM,用于对冲击负荷的快速补偿。首先针对主电路拓扑结构特点,提出了基于载波移相的空间矢量调制策略;针对不平衡负荷特点,采用基于双d-q变换和对称分量法计算补偿线电流,并提出了补偿相电流的优化设计方法来提高D-STATCOM的补偿能力。提出了瞬时电流分相控制方法,可以使D-STATCOM的输出快速地跟踪参考补偿电流以提高响应速度。在所建立的10kVA物理样机上的试验结果验证了所提方法的有效性。更多还原

【Abstract】 Research on distribution-static compensator(D-STATCOM)for unbalanced and nonlinear load compensation is proposed.A novel transformer-isolated multilevel H-bridges inverter is introduced,which is suitable for large unbalanced load compensation.A phase-shift space vector modulation(SVM)strategy is proposed.The dual d-q transformation and symmetrical components method are used to determine the compensation line-currents for unbalanced load.An optimum design method is proposed to balance the three-phase compensation currents of the delta-connected transformer.A current control scheme with fast response speed is designed to regulate the instantaneous three-phase currents separately.Finally the 10kVA D-STATCOM prototype is presented and the experimental results are used to verify the proposed methods.更多还原