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

日本谐波污染严重，6.6kV配电网夜间轻载时中心城区5次谐波电压最大值超过7%。这些意见是根据实际测量得出的，提出夜间6.6kV母线上5次谐波电压的增加是由于配电系统上安装的用于功率因数校正的并联电容器和线路电感之间的谐波谐振引起的“谐波传播”。基于电压检测的受控并联有源滤波器，用于在整个配电系统中进行谐波阻尼。每个有源滤波器都以这样的方式控制，即对于基频，对外部电路呈现无穷大的阻抗，而对于谐波频率，呈现低电阻。设计并建造了一个由两条馈线组成的配电系统，每条馈线的额定电压为200 V，额定功率为40 kW。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，沿着与理论结果，已示出的有效性的有源滤波器，导致其显着的适用性的一个真实的配电系统，这是由于谐波谐振的谐波传播。

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.