基于自适应虚拟阻抗的改进下垂控制器设计  

Design of Improved Droop Controller Based on Adaptive Virtual Impedance

作　　者：周镇 彭元修[1] 刘斌[1] 李小文 查海涛 ZHOU Zhen;PENG Yuanxiu;LIU Bin;LI Xiaowen;ZHA Haitao(School of Information Engineering,Nanchang Hangkong University,Nanchang 330063,Jiangxi,China;State Grid Nanchang Changbei Power Supply Company,Nanchang 330063,Jiangxi,China;State Grid Jiangxi Electric Power Co.,Ltd.Zhelin Hydropower Plant,Jiujiang 332000,Jiangxi,China)

机构地区：[1]南昌航空大学信息工程学院,江西南昌330063 [2]国网南昌市昌北供电公司,江西南昌330063 [3]国网江西省电力有限公司柘林水电厂,江西九江332000

出　　处：《电气传动》2022年第17期40-45,共6页Electric Drive

基　　金：国家自然科学基金资助项目(61963030);江西省自然科学基金资助项目(S2019QNZD2B0113)。

摘　　要：微电网在孤岛运行模式下,系统中各分布式发电单元由于输出线路阻抗差异,导致输出功率难以进行合理分配,影响系统的稳定性。为实现孤岛微电网中各分布式电源在输出阻抗不匹配情况下能合理按容分配功率,分析了并联逆变器功率分配的影响因素,提出了一种基于自适应虚拟阻抗的改进下垂控制策略,并通过收敛性分析验证了其可行性。该策略根据功率分配比偏差,自适应调整虚拟阻抗与电压相角,从而实现功率按容分配。仿真及实验表明,所提改进下垂控制策略能实现各分布式电源输出功率的合理分配,且克服了传统下垂控制中功率分配对母线电压角频率的影响,提高了系统的稳态性能。In the isolated island operation mode of microgrid,the output power of distributed generation units in the system is difficult to distribute reasonably due to the difference of output line impedance,which affects the stability of the system.In order to realize the reasonable distribution of power according to capacity of distributed generation in isolated island microgrid under the condition of mismatched output impedance,the influencing factors of power distribution of parallel inverter were analyzed,and an improved droop control strategy based on adaptive virtual impedance was proposed,and its feasibility was verified by convergence analysis.According to the deviation of power distribution ratio,the strategy adaptively adjusts virtual impedance and voltage phase angle to realize power distribution according to capacity.Simulation and experiment show that the improved droop control strategy can realize the rational distribution of output power of distributed generation,and overcome the influence of power distribution on bus voltage angular frequency in traditional droop control,and improve the steady-state performance of the system.

关 键 词：孤岛微电网 自适应虚拟阻抗 下垂控制 功率按容分配 

分 类 号：TM464[电气工程—电器]