摘要
【目的】针对配电网三相不平衡负载补偿问题,研究变压器隔离型配电网静止同步补偿器(DSTAT-COM)的补偿性能。【方法】以变压器隔离型逆变器为DSTATCOM的主电路,建立其数学模型,采用基于旋转坐标变换的方法计算DSTATCOM的补偿参考电流,提出瞬时无功功率分相控制与载波移相SPWM(Cps-SPWM)调制技术相结合的控制策略。在PSCAD/EMTDC环境中,对变压器隔离型DSTATCOM的补偿性能进行仿真研究。【结果】基于旋转坐标变换的补偿电流计算方法,能快速计算各相补偿电流,瞬时无功功率分相控制与Cps-SPWM调制技术相结合的控制策略,能有效地降低系统电流的不对称度,提高系统的功率因数,优化负荷电流的谐波性能。在各种负荷不平衡情况下,变压器隔离型DSTATCOM均具有良好的补偿性能。【结论】变压器隔离型DSTATCOM主电路结构简单,易于分相控制;瞬时无功功率分相控制与Cps-SPWM调制技术相结合的控制策略,能对不平衡负荷实现快速补偿,满足配电网对不平衡负荷的补偿要求。
【Objective】Compensation performance of the transformer-isolated multilevel H-bridges DSTATCOM for three-phase unbalanced load was studied.【Method】The main circuit of DSTATCOM is a inverter with separating transformer,and the mathematical model was established.Rotating coordinate transformation was used to determine the compensation currents for unbalanced load,and a control strategy was adopted by combination of instantaneous reactive power split-control and carrier phase-shifting PWM.The simulation was performed by PSCAD/EMTDC software.【Result】Calculation of compensation current was achieved quickly by rotating coordinate transformation method.The proposed control strategy could reduce the unbalanced factor of source,to improve power factor,and to eliminate harmonic.The transformer-isolated multilevel H-bridge DSTATCOM had ideal compensation performance under unbalanced load with different working conditions.【Conclusion】The DSTATCOM with separating transformer had simple main circuit configuration,liable to split-control,which can achieve rapid reactive compensation and meet the requirement of unbalanced load compensation.
出处
《西北农林科技大学学报（自然科学版）》
CSCD
北大核心
2009年第6期222-228,共7页
Journal of Northwest A&F University(Natural Science Edition)
基金
国家自然科学基金项目(50707026)
关键词
静止同步补偿器
不平衡负荷
变压器隔离
瞬时无功功率
载波移相
distribution static compensation（DSTATCOM）
unbalanced load
isolating transformer
single-phase instantaneous reactive power
carrier phase-shifted
