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阐述了星形链式SVG进行无功和负序综合补偿的工作原理,对补偿器零序电压分量进行了数学推导,发现该分量受输出电流无功分量与负序分量比值的影响。补偿器负序补偿能力受到链节输出电压的限制,为此提出一种改进的电压电流双闭环控制策略:1、限制指令电流负序分量;2、在电压调制信号中注入零序分量。最后通过仿真验证了所提控制策略的有效性。
The working principle of reactive compensation and negative sequence compensation of star chain SVG is expounded. The zero sequence voltage component of the compensator is mathematically deduced. It is found that this component is affected by the ratio of reactive component to negative sequence component of output current. The compensator negative sequence compensation ability is limited by the output voltage of the link. Therefore, an improved voltage-current double closed-loop control strategy is proposed: 1, the negative sequence component of the command current is limited; 2, the zero sequence component is injected into the voltage modulation signal. Finally, the effectiveness of the proposed control strategy is verified by simulation.