一种并联逆变器自适应下垂控制方法  

An adaptive droop control method for parallel inverters

作　　者：吴中东 丁石川[1] 郭小璇 王正风 彭伟 杭俊[1] 张成强 WU Zhongdong;DING Shichuan;GUO Xiaoxuan;WANG Zhengfeng;PENG Wei;HANG Jun;ZHANG Chengqiang(School of Electrical Engineering and Automation,Anhui University,Hefei 230601,China;Nanning Power Supply Bureau,Guangxi Power Grid Corporation,Nanning 530031,China;Dispatching Center of State Grid Anhui Electric Power Co.,Ltd.,Hefei 230038,China)

机构地区：[1]安徽大学电气工程与自动化学院,安徽合肥230601 [2]广西电网有限公司南宁供电局,广西南宁530031 [3]国网安徽省电力有限公司调控中心,安徽合肥230038

出　　处：《电力系统保护与控制》2023年第7期84-94,共11页Power System Protection and Control

基　　金：国家自然科学基金项目资助(52177027,52107034);安徽省自然科学基金优秀青年项目资助(2108085Y18);安徽省高校优秀青年人才支持计划重点项目资助(gxyqZD2021090);广西电网科技项目资助(GXKJXM20180433)。

摘　　要：在逆变器并联系统中,由于线路阻抗的差异,传统下垂控制功率分配精度不高,并且复杂工况下输出电压控制精度低。为了解决以上问题,提出一种基于自适应参数的改进下垂控制方法。该方法在传统P-V下垂控制的基础上,代入基于Lyapunov函数的自适应参数控制,降低原有线路阻抗的影响,保证输出电压在任意负载工况下均保持在一定的约束范围内。此外,在控制回路中加入虚拟阻抗,通过有功功率反馈调节虚拟阻抗比例系数,进一步提高功率分配精度。仿真和实验结果验证了所提出的改进下垂控制方法的有效性。In the inverter parallel system,because of the difference of line impedance,the power distribution accuracy of traditional droop control is not high,and the output voltage control accuracy is low in complex working conditions.To solve these problems,an improved droop control method based on adaptive parameters is proposed.Based on traditional P-V droop control,this method is replaced by an adaptive parameter control based on the Lyapunov function.This can reduce the influence of the original line impedance and ensure that the output voltage is kept within a certain constraint range under any load condition.In addition,virtual impedance is added to the control loop,and the proportional coefficient of the virtual impedance is adjusted through active power feedback to further improve the accuracy of power distribution.Simulation and experimental results verify the effectiveness of the proposed improved droop control method.

关 键 词：并联逆变器 下垂控制 LYAPUNOV函数 自适应控制 线路阻抗 

分 类 号：TM464[电气工程—电器] TP273[自动化与计算机技术—检测技术与自动化装置]