A New Control Strategy for General Purpose Active Power Filters with Automatic Control of Compensation Capability

本课题的研究目的是建立基于LC滤波器实时数字仿真的电压检测通用型有源电力滤波器的控制策略。研究结果总结如下：1.研究成果。搭建了该有源滤波器的两套实验系统。进行了理论和实验研究。研究结果证实了该控制策略的基本补偿特性和有效性。此外，还验证了根据配电线路状态进行补偿的控制系统的有效性。对所提出的有源电力滤波器的并联进行了研究。在实验中，对晶闸管相控整流器产生的谐波电流进行了补偿。从这些结果可以看出，两分量有源滤波器的补偿电流之间具有良好的平衡性。需要注意的是，虽然两个分量有源滤波器的控制系统之间没有互连，但仍然可以实现补偿电流之间的平衡。研究了多个有源电力滤波器在配电线路中的安装策略。根据这些结果，我们指出，配电网的谐波电压在元件有源滤波器之间的区域得到了有效的降低。同时指出，当多个有源电力滤波器集中安装在配电线路的同一点时，可能会产生较大的谐波分量。研究结果表明，配电网的谐波补偿采用分布式接线方式是可行的，达到了本课题的预期目标。

The purpose of this research project is the establishment of the control strategy for general-purpose active power filters with voltage detection based on the real-time digital simulation of the LC filter. The summery of the results is as follows.1. The two sets of the experimental system of the proposed active filter have been constructed.2. The theoretical and experimental investigations have been carried out. From the results of these investigations, the basic compensation characteristics and validity of the control strategy have been confirmed. In addition, the effectiveness of the control system for the compensation capability according to the condition of the distribution lines has been shown.3. The parallel connection of the proposed active power filters has been investigated. In the experiment, the harmonic current generated by a thyristor phase-controlled rectifier was compensated. From these results, the good balance between the compensation currents of the two component active filters has been observed. It should be noted that the balance between the compensating currents can be achieved although there is no interconnection between the control systems of the two component active filters.4. The installation strategy of plural active power filters in the distribution lines has been investigated. From these results, we have pointed out that the harmonic voltage of the distribution line is effectively reduced in the area between the component active filters. It is also clarified that the harmonic components may become large when the plural active power filters are installed concentratively at the same point of the distribution line. From these investigations, we have concluded that the distributed connection is desirable for the harmonic compensation in the distribution lines.From the above results, I believe that the expected goal of this research project has been attained.