基于可调电抗器的改进微网下垂控制方法  

Improved Microgrid Droop Control Method Based on Adjustable Reactor

作　　者：林哲侃 陈建春 李达义[1] 许烽 LIN Zhekan;CHEN Jianchun;LI Dayi;XU Feng(State Key Laboratory of Advanced Electromagnetic Engineering Technology,Huazhong University of Science and Technology,Wuhan 430074,China;State Grid Zhejiang Electric Power Co.,Ltd.Research Institute,Hangzhou 310014,China)

机构地区：[1]华中科技大学强电磁工程与新技术国家重点实验室,武汉430074 [2]国网浙江省电力有限公司电力科学研究院,杭州310014

出　　处：《高电压技术》2020年第8期2798-2805,共8页High Voltage Engineering

基　　金：国家重点研发计划(2017YFB0903100);国家电网公司科技项目(521104170043).

摘　　要：分布式电源的容量受自身和环境等多种因素的影响而各不相同,应用下垂控制方法可有效解决分布式电源的功率分配问题。为了解决传统下垂控制无法适用于微网阻感性线路的问题,提出了基于可调电抗器的改进微网下垂控制方法。首先,分析了传统下垂控制无法在阻感性线路上实现功率分配的原因,提出了利用可调电抗器改进下垂控制的具体方法;接着,提出了一种磁通控制型可调电抗器,求出了输出阻抗的表达式,并对接入微网的稳定条件进行了分析;最后,搭建了改进下垂控制方法的MATLAB仿真模型。仿真结果表明:设定分布式电源容量比为2:1时,通过改进下垂控制方法,稳态时可使有功功率比由改进前的6:5转变为2:1,无功功率的稳定时间由改进前的200 ms缩短至50 ms,满足了功率分配的要求。该结果证明,基于可调电抗器的改进微网下垂控制方法能够很好地实现有功和无功功率的按比例分配。The capacity of different distributed generation varies depending on various factors such as itself and the environment.The application of the droop control method can effectively solve the power distribution problem between two or more distributed generations.In order to solve the problem that the traditional droop control can not be applied in resistor-inductance circuit,an improved droop control method based on the adjustable reactor is proposed.Firstly,the reason why the traditional droop control can not be applied in the resistor-inductance circuit to realize the power distribution is analyzed.The specific method of improving droop control by using the adjustable reactor is proposed.Then,a flux-controlled adjustable reactor is proposed,the expression of the output impedance is obtained,and the stability is analyzed.Finally,the MATLAB simulation model with the improved droop control method is built.The simulation results show that when the capacity ratio of two distributed generations is set to 2:1,applying the improved droop control method can change the active power ratio from 6:5 to 2:1 in steady state and shorten the reactive power stabilization time from 200 ms to 50 ms,which meets the power distribution requirements.The simulation results prove that the improved droop control method based on adjustable reactor can effectively achieve the distribution of active and reactive power.

关 键 词：分布式电源 下垂控制 功率分配 阻感性线路 可调电抗器 

分 类 号：TM47[电气工程—电器]