Abstract：Due to the resonance between power factor correction capacitors and feeder inductors in closed-loop distribution network, the background harmonic voltage will be amplified, causing severe distortion of node voltage, which can affect the normal operation of electrical equipment and even endanger the personal safety of users. The current mainstream suppression scheme is resistive active power filter (RAPF) based on impedance matching principle, which is installed at the midpoint of closed-loop distribution network with conductance gain of Z/2 (Z is the characteristic impedance of the distribution feeder). The RAPF can effectively suppress background harmonic voltage amplification, but cannot further attenuate background harmonic voltage to achieve better suppression performance. Some improvement schemes based on RAPF can optimize suppression performance, but all come at the sacrifice of increasing costs (installing communication equipment or increasing the number of APFs). Firstly, the propagation law of background harmonic voltage on the closed-loop distribution feeder was analyzed by the distributed parameter model. The degree of amplification of background harmonic voltage on the feeder depends on the distance between the beginning of the feeder and the nearest antinode (including the antinode located on the left side of the harmonic source). The farther the distance, the more severe the amplification of background harmonic voltage. When the beginning of the feeder is exactly at the standing wave node, the amplification of the background harmonic voltage is most severe. On the contrary, when the beginning of the feeder is exactly at the standing wave antinode, the harmonic voltage amplification factor at all positions on the feeder will not be greater than 1, that is, the background harmonic voltage will not be amplified. Based on this, the suppression scheme based on the phase shift of harmonic voltage standing wave is proposed. The principle is to move the phase of the standing wave to make the antinode close to or exactly fall on the beginning of the feeder. The propose scheme can be divided into two suppression strategies: standing wave shifting to the left and standing wave shifting to the right. The two have different applicable ranges, according to the relationship between the length of the feeder and the suppressed harmonic wavelength, the suppression conditions are divided into three types, and the selection of the direction of standing wave movement and the calculation of the optimal control parameters are discussed separately. Finally, the proposed scheme is implemented through standing wave phase shifting based active power filter (SWPS-APF) and its control block diagram is provided. A 10 km long closed-loop distribution feeder simulation model was built in PLECS software to evaluate the suppression performance and compensation capacity of SWPS-APF under three operating conditions: no load on the feeder, 100 Ω load on the feeder, and feeder parameters changes. Experimental verification was conducted on a down-scaled experimental platform. Both simulation and experimental results indicate that the proposed scheme has significant advantages over mainstream RAPF schemes in terms of suppression performance and compensation capacity. In conclusion, compared with various existing suppression schemes, the proposed standing wave phase shifting scheme only requires the installation of an APF at the midpoint of the closed-loop distribution feeder, without the need for communication equipment, and has lower costs. However, it can achieve better suppression performance and less compensation capacity.
张敏, 孙孝峰, 朱艳萍, 沈虹, 李昕. 驻波移相有源电力滤波器在环形配电网中的应用[J]. 电工技术学报, 2025, 40(1): 203-216.
Zhang Min, Sun Xiaofeng, Zhu Yanping, Shen Hong, Li Xin. Applications of Standing Wave Phase Shifting Active Power Filters in Closed-Loop Distribution Power Systems. Transactions of China Electrotechnical Society, 2025, 40(1): 203-216.
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