光伏并网配电网低频振荡协调控制研究  

Research on Coordinated Control of Low-Frequency Oscillation in Photovoltaic Grid-Connected Distribution Network

作　　者：汪卓俊 何锋 鲁济星 汪旭 邹文仲 WANG Zhuojun;HE Feng;LU Jixing;WANG Xu;ZOU Wenzhong(Huzhou Power Supply Company,State Grid Zhejiang Electric Power Co.,Ltd.,Huzhou 313000,China;Nanjing Nanrui Jibao Electric Co.,Ltd.,Nanjing 211102,China)

机构地区：[1]国网浙江省电力有限公司湖州供电公司,浙江湖州313000 [2]南京南瑞继保电气有限公司,江苏南京211102

出　　处：《自动化仪表》2025年第3期49-53,共5页Process Automation Instrumentation

基　　金：浙江省电力公司重点科技基金资助项目(J2020068)。

摘　　要：光伏新能源并网会使配电网机组产生低频振荡而影响正常运行,因此需要进行振荡抑制。为了提高光伏并网配电网低频振荡抑制的协调性和适应性,提出基于阻尼控制器的光伏并网配电网低频振荡协调控制方法。首先,对光伏并网配电网的光伏阵列、逆变器和直流滤波电容器进行建模分析,获得三者之间的数学关系。其次,根据建模分析结果,采用模式分析法识别配电网中存在的低频振荡特性。最后,创新性地设计观测器,获取光伏并网配电网的状态变量。结合低频振荡特性设计阻尼控制器,引入阻尼效应下的反馈控制增益矩阵以加快控制响应速度,从而协调控制光伏并网配电网的低频振荡。试验结果表明,所提方法可在6 s内使电磁功率保持稳定,抑制速度较快。该方法控制协调性较好、适用性较强。The grid-connection of photovoltaic new energy will cause low-frequency oscillation of the distribution network unit,which affects normal operation and requires oscillation suppression.To improve the coordination and adaptability of low-frequency oscillation suppression in photovoltaic grid-connected distribution network,a coordinated control method of low-frequency oscillation in photovoltaic grid-connected distribution network based on damping controller is proposed.Firstly,the photovoltaic array,inverter and direct current filter capacitor of the photovoltaic grid-connected distribution network are modeled and analyzed to obtain the mathematical relationship among the three.Secondly,based on the modeling and analysis results,the pattern analysis method is used to identify the low-frequency oscillation characteristics existing in the distribution network.Finally,the observer is innovatively designed to obtain the state variables of the photovoltaic grid-connected distribution network.The damping controller is designed to combine the low-frequency oscillation characteristics,and the feedback control gain matrix under the damping effect is introduced to increase the speed of the control response,so as to coordinate the control of the low-frequency oscillation of the photovoltaic grid-connected distribution network.The experimental results show that the proposed method can keep the electromagnetic power stable within 6 s with fast suppression speed.The method has better control coordination and higher applicability.

关 键 词：阻尼控制器 建模分析 光伏并网配电网 协调控制 低频振荡 观测器 

分 类 号：TH-39[机械工程]