Research on networked autonomous control of voltage-detection-based active filters for dispertion on a power distribution system

日本谐波污染的严重现状有报道：某6.6 kv配电系统在夜间轻负荷工况下，市中心5次谐波电压最大值超过7%。这些基于实际测量的观察结果表明，夜间6.6 kv母线上5次谐波电压的增加是由于安装在配电系统上用于功率因数校正的线路电感器和并联电容器之间的谐波共振造成的“谐波传播”。研究人员对基于电压检测的两个全数字控制并联有源滤波器的网络自主控制进行了全面的研究，以用于整个配电系统的谐波阻尼。每个有源滤波器都以这样一种方式控制，即在基频时向外部电路呈现无限阻抗，并在谐波频率时表现出低电阻。设计并构建了一个由两个馈线组成的配电系统，其中每个馈线的额定功率为200v和40kw，该配电系统用于验证网络自主控制有源滤波器的实际可行性和合理性。从实验室系统中获得的实验结果和理论结果都表明了有源滤波器的有效性，使其在谐波共振导致谐波传播的实际配电系统中具有显著的适用性。

The serious status of harmonic pollution in Japan has been reported : The maximum value of 5th harmonic voltage in the downtown area of a 6.6-kV power distribution system exceeds 7% under light-load conditions at night. These observations, which are based on the actual measurements, suggest that the increase of 5th harmonic voltage on the 6.6-kV bus at night is due to "harmonic propagation" resulting from harmonic resonance between line inductors and shunt capacitors installed on the distribution system for power factor correction.The investigators have achieved comprehensive research on networked autonomous control of two fully-digital-controlled shunt active filters based on voltage detection for harmonic damping throughout a power distribution system. Each active filter is controlled in such a way as to present infinite impedance to the external circuit for the fundamental frequency, and as to exhibit a low resistance for harmonic frequencies. A power distribution system consisting of two feeders has been designed and constructed, where each feeder is rated at 200 V.and 40 kW, The distribution system was used to verify the practical viability and justification of the networked-autonomous-controlled active filters. Experimental results obtained from the laboratory system, along with theoretical results, have shown the effectiveness of the active filters, leading to its significant applicability to a real power distribution system which is subject to harmonic propagation as a result of harmonic resonance.