孤岛微电网电流同步U-I下垂控制方法  

Current synchronous U-I droop control strategy for islanded microgrids

作　　者：徐化博 赵艳雷[1] 路茂增 毕永健 XU Huabo;ZHAO Yanlei;LU Maozeng;BI Yongjian(School of Electrical and Electronic Engineering,Shandong University of Technology,Zibo 255000,Shandong,China)

机构地区：[1]山东理工大学电气与电子工程学院,山东淄博255000

出　　处：《电测与仪表》2024年第5期190-197,共8页Electrical Measurement & Instrumentation

基　　金：国家重点研发计划项目(2017YFB0902800);山东省自然科学基金青年项目(ZR2020QE215)。

摘　　要：采用电压-电流(U-I)下垂控制的孤岛微电网系统始终运行于工频频率,避免了传统下垂控制存在的频率偏差及频率越限问题,但电源间易产生环流,功率分配精度差。为此,提出电流同步U-I下垂控制方法,该方法由电流同步控制及U-I幅值下垂控制两部分构成。前者通过调节输出电压相角使各电源输出电流相角一致,以抑制电源间环流;后者依据输出电流的幅值调节输出电压的幅值,使各电源出力依据自身容量分配。在此基础上,建立双端系统的小信号模型,分析电流同步控制环路中控制参数对系统稳定性的影响,为参数设计提供依据。仿真及实验结果表明,相比U-I下垂控制,所提方法的系统环流减小50%以上,电压畸变率改善近10%,电源间功率分配精度及系统电能质量均得到明显提升。The islanded micro-grid system using voltage-current(U-I)droop control operates at power frequency,which avoids the frequency deviation and frequency over-limit caused by traditional droop control,but it causes circulation,and inaccuracy power sharing among distributed generations(DGs).Therefore,the current synchronous U-I droop control method is proposed,which consists of current synchronous control and U-I amplitude droop control.The former can restrain the circulation by adjusting the output voltage phase angle to make the output current phase angle of each DGs consistent.The latter regulates the amplitude of the output voltage according to the amplitude of the output current so that power sharing of each DGs is distributed according to its capacity.On this basis,the small-signal model of the double-terminal system is established to analyze the influence of control parameters in the current synchronous control loop on the stability of the system,which provides a basis for parameter design.Simulation and experimental results show that,compared with U-I droop control,the proposed method can reduce the system circulation by more than 50%,improve the voltage distortion rate by nearly 10%,and improve the power distribution precision between DGs and the power quality of the system significantly.

关 键 词：电流同步U-I下垂控制 定频控制 孤岛微网 环流抑制 卫星授时 

分 类 号：TM464[电气工程—电器]