| 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(DSTATCOM)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. |
| 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 |
| DOI： |
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| 基金项目:国家自然科学基金项目（50707026） |
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| A study on compensation performance of the transformer-isolated multilevel H-bridges DSTATCOM for three-phase unbalanced load |
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| Abstract: |
| 【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. |
| Key words: distribution static compensation (DSTATCOM) unbalanced load isolating transformer single-phase instantaneous reactive power carrier phase-shifted |
