无额外直流储能元件的串联型电能质量控制器新型控制策略

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。

Novel Control for Series Power Quality Controller Without External DC Energy Source

The ride through capability is a major index of the performance for series power quality controllers (SPQC), while a SPQC using traditional control, i.e. either in-phase control or energy optimized control, only provides limited maximal ride through time if no energy storage capacitor is employed. A novel control strategy for SPQC was proposed in this paper, which increased the ride through capability by automatically drawing certain amount of active power from the line input and supplied them to the SPQC to afford the power loss when compensating input line voltage disturbance, so no energy storage capacitor was required even for continuous compensation. A specific phasor diagram representation of SPQC was introduced. The load current phasor was chosen as reference phasor, leading to simple relationship among the related variables within SPQC. A phasor diagram was carried out accordingly, for both the input line voltage disturbance state and the normal state. The compensating voltage magnitude and the maximal depth of the line voltage sag that SPQC with such a control strategy could fully compensate was obtained quantitatively. The system detailed power flow was also discussed in a quantitative manner. A simple and unified implementation method was proposed and analyzed extensively based on system energy equilibrium. The computer simulation and prototype experimental results are shown to verify the validity of all the analysis of control.