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对电压幅度暂变的最大补偿时间是串联型电能质量控制器(series power quality controllers,SPQC)重要性能指标。若没有额外直流储能元件,传统的同相位控制或能量优化控制只能提供有限的补偿时间。该文对SPQC提出一种新型控制策略,它在负载电压控制的同时,自动地从电源吸收部分有功功率来补偿其系统损耗,从而提高最大可补偿时间;甚至在没有额外直流储能元件时还具有持续补偿能力。采用负载电流相量为参考相量的新型相量图表示方法,使得SPQC系统内各相关变量之间的关系更加清晰简单。在电源电压幅度暂变和额定状态,分别对系统进行相应的相量图分析,得到采用这种新型控制策略的定量补偿电压幅度、可完全补偿的最大程度电压暂低以及系统的功率流动方式。根据系统能量平衡关系,提出该新型控制策略的一种简单统一实现方法。计算机仿真和原型实验验证了所得结论。
The maximum compensation time for a voltage amplitude transient is an important performance indicator of a series power quality controller (SPQC). Without additional DC energy storage elements, the conventional in-phase control or energy-optimized control can only provide limited compensation time. In this paper, a new control strategy for SPQC is proposed, which can automatically compensate part of the active power from the power supply to compensate its system loss while the load voltage is controlled, so as to increase the maximum allowable compensation time. Even without additional DC energy storage components With continuous compensation ability. Using the new phasor representation of load current phasor as a reference phasor, the relationship between all the relevant variables in the SPQC system is more clear and simple. In the condition of power supply voltage transient and rated state, the corresponding phasor diagram of the system is analyzed respectively. The quantitative compensation voltage amplitude with this new control strategy is obtained, and the maximum transient voltage can be completely compensated and the power flow mode of the system. According to the energy balance of the system, a simple and unified method of the new control strategy is proposed. Computer simulation and prototype experiments verify the conclusions.