基于有源和无源阻尼协同控制的光伏直流升压汇集系统谐振抑制  

Resonance Suppression of Photovoltaic DC Boost Collection System Based on Active and Passive Damping Cooperative Control

作　　者：潘鹏程 韩文舜[1,2] 郭雪丽 PAN Pengcheng;HAN Wenshun;GUO Xueli(College of Electrical Engineering&New Energy,China Three Gorges University,Yichang 443002,China;Hubei Provincial Collaborative Innovation Centre for New Energy Microgrid,China Three Gorges University,Yichang 443002,China;State Grid Nanyang Power Supply Company,Nanyang 473000,China)

机构地区：[1]三峡大学电气与新能源学院,湖北宜昌443002 [2]三峡大学新能源微电网湖北省协同创新中心,湖北宜昌443002 [3]国网河南省电力公司南阳供电公司,河南南阳473000

出　　处：《中国电力》2025年第3期20-30,共11页Electric Power

基　　金：国家水运安全工程技术研究中心开放基金资助项目(B2022002)。

摘　　要：光伏直流升压汇集系统中,DC/DC换流器内部LC电路与开关电路因阻抗匹配而产生谐振问题,从而导致系统稳定性变差甚至崩溃。针对换流器因阻抗匹配产生的谐振问题,提出了有源和无源阻尼协同控制以消除谐振的方法。首先,建立了在不同工况下的换流器运行小信号阻抗模型。其次,利用阻抗比判据对比分析系统稳定性差异,并讨论了不同虚拟电阻对系统稳定性的影响。最后,通过将产生谐振峰值处的角频率点与其相邻正常角频率点的等效阻抗幅值之比限定为[0.95,1.15],将阻尼电阻值在最大功率点跟踪(maximum power point tracking,MPPT)控制下换流器的闭环输出阻抗幅值提高了约1.5倍。研究结果表明,相比仅采用有源或无源阻尼法,所提协同控制策略使得产生谐振处的幅值由–15 dB增加到40.5 dB,提高约4倍,且系统具有较大的幅值和相角裕度,可有效提高系统的稳定性。In a photovoltaic DC collection system,the impedance matching between the LC circuit and switching circuit in the DC/DC converter is easy to generate resonance,which leads to the system stability deterioration or even collapse.In order to solve the resonant problem of the converter due to impedance matching,the active and passive damping cooperative control is proposed to eliminate the resonance.Firstly,the small-signal impedance model of the converter under different operating conditions is established.Secondly,the impedance ratio criterion is used to analyze the stability differences of the system,and the influence of different virtual resistance values on the system stability is discussed.Finally,by using the ratio of the equivalent impedance amplitude between the angular frequency point at which the resonance peak is generated and its neighboring normal angular frequency point limited between[0.95,1.15],the closed-loop output impedance amplitude of the converter under MPPT control with the value of the damping resistor is obtained to be improved by about 1.5 times.The results show that compared with only active or passive damping control,the proposed cooperative control strategy increases the amplitude at resonance generation from-15dB to 40.5dB,which is about 4 times,and the system has large amplitude margin and phase margin,which effectively improve the stability of the system.

关 键 词：光伏发电 直流升压汇集 小信号阻抗建模 有源和无源阻尼 谐振抑制 稳定性分析 

分 类 号：TM7[电气工程—电力系统及自动化]