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基于链式逆变器的50MVA静止同步补偿器的直流电压平衡控制 被引量:148

BALANCING CONTROL OF DC VOLTAGES OF 50MVA STATCOM BASED ON CASCADE MULTILEVEL INVERTERS
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摘要 结合 50MVA 静止同步补偿器的研制,建立了基于链式逆变器的 STATCOM 直流电容电压稳态数学模型,揭示了电容电压不平衡现象产生的机理,分析了控制直流电压平衡的手段,提出了一种基于直流母线能量交换的直流电压平衡控制方法。分析了基于交流电源母线能量交换的直流电容电压平衡控制方法的原理,提出了最大(或最小)电容电压跟踪的平衡控制方法,并在 50MVA STATCOM 的PSCAD 模型上进行了仿真研究及在±18kvar 物理模拟装置上进行了实验。仿真结果及实验结果验证了稳态模型以及所提控制方法的正确性和可行性。 Combined with the development of a 50MVA STATCOM based on IGCT, the steady state mathematical model of DC capacitor voltages for STATCOM based on cascade multilevel inverters is established, the mechanism of DC voltage unbalance is explained and the various measures to control the balancing of the DC voltages are analyzed in this paper. The balancing control scheme based on energy exchange through a DC bus is proposed. The principle of balancing control scheme based on energy exchange through an AC bus is analyzed and the control method of tracking the maximum (or minimum) DC voltage is proposed. The proposed control method is studied with simulation on the PSCAD model of the 50MVA STATCOM and with experiments on a ±18kvar STATCOM installation. The simulation and experimental resu- lts show the correctness and the feasibility of the mathematical model and the proposed control method.
出处 《中国电机工程学报》 EI CSCD 北大核心 2004年第4期145-150,共6页 Proceedings of the CSEE
关键词 50MVA静止同步补偿器 直流电压平衡控制 链式逆变器 电力系统 电网 Power electronics STATCOM (Static synch- ronous compensator) Cascade multilevel inverter IGCT (Integrated Gate-Commutated Thyristor)
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