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Research on a shunt active filter for damping of harmonic propagation in power distribution systems

并联有源滤波器抑制配电系统谐波传播的研究

基本信息

批准号：
08455135
负责人：
AKAGI Hirofumi
金额：
$ 5.31万
依托单位：
Okayama University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

项目摘要

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 harmoni resonance between line inductors and shunt capacitors installed on the distribution system for power factor correction.Research has been done on a shunt active filter based on voltage detection, which 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 feeder rated at 200 V and 20 kW has been designed and constructed to verify the practical viability and justification of the active filter rated at 0.67 kVA.Experimental results obtained from the laboratory system, along with theoretical results, are summarized as follows.・Installation of the active filter on the end bus of a power distribution line is more effective in harmonic damping than installation on the beginning bus or in the vicinity of a primary ditribution transformer.・Installation on the end bus makes the required current ration of the active filter smaller than installation at the beginning bus.・Harmonic mitigation ofvoltage and current is a welcome "byproduct, " as a result of harmonic damping throughout the power distribution line.

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%。根据实测结果，认为夜间6.6kV母线上5次谐波电压的增加是由于线路电感与配电网上用于功率因数校正的并联电容器之间的谐波谐振引起的“谐波传播”。其以这样的方式被控制，使得对于基频，对外部电路呈现无穷大的阻抗，并且对于谐波频率呈现低电阻。设计并建造了额定电压为200 V、功率为20 kW的配电馈线，以验证额定电压为0.67 kVA的有源滤波器的实际可行性和合理性。实验室系统获得的实验结果沿着理论结果总结如下。·将有源滤波器安装在配电线路末端母线上比安装在起始母线或主配电Transformer附近更能有效抑制谐波。·安装在末端母线上使有源滤波器所需的电流比小于安装在起始母线上。·电压和电流的谐波缓解是受欢迎的“副产品”，因为整个配电线路的谐波阻尼。