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

本研究的目的是在对LC滤波器进行实时数字仿真的基础上，建立通用电压检测型有源电力滤波器的控制策略。主要研究结果如下：1.搭建了两套有源滤波器的实验系统.进行了理论和实验研究。从这些调查的结果，基本的补偿特性和控制策略的有效性已被证实。此外，根据配电线路的情况，对补偿能力的控制系统的有效性进行了说明.提出的有源电力滤波器的并联连接进行了研究。实验中对晶闸管相控整流器产生的谐波电流进行了补偿。从这些结果中，已经观察到两个分量有源滤波器的补偿电流之间的良好平衡。应该注意的是，尽管两个分量有源滤波器的控制系统之间没有互连，但是可以实现补偿电流之间的平衡。研究了多台有源电力滤波器在配电线路中的安装策略。从这些结果中，我们已经指出，配电线路的谐波电压是有效地降低在组件有源滤波器之间的区域。还阐明了当多个有源电力滤波器集中地安装在配电线路的同一点处时，谐波分量可能变大。通过以上研究，得出了配电线路采用分布式接线方式进行谐波补偿是可取的结论，相信达到了本课题的预期目的。

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.