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

据报道，日本的谐波污染严重：在夜间轻负荷条件下，6.6千伏配电网市中心5次谐波电压的最大值超过7%。这些基于实际测量的观察结果表明，6.6kV母线夜间5次谐波电压的增加是由于配电网中安装在功率因数校正装置上的线路电感和并联电容器之间的谐波谐振引起的“谐波传播”。研究人员对基于电压检测的两个全数字并联型有源滤波器的联网自主控制进行了全面的研究，以实现整个配电网的谐波抑制。每个有源滤波器以这样一种方式控制，即向外部电路提供对基波频率的无限阻抗，以及对谐波频率表现出低电阻。设计并搭建了由两条馈线组成的配电系统，每条馈线额定电压为200V，额定功率为40kW，并用该配电系统验证了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，这使得它在实际电力分配系统中具有重要的适用性，因为该系统容易由于谐波谐振而发生谐波传播。

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.