基于改进下垂控制的直流微电网大扰动稳定性分析  

Large-disturbance Stability Analysis of DC Microgrid Based on Improved Droop Control

作　　者：王浩 陈纪凯 李斌[1] 张国澎[1] 韦延方[1] 王晓卫 WANG Hao;CHEN Jikai;LI Bin;ZHANG Guopeng;WEI Yanfang;WANG Xiaowei(School of Electrical Engineering and Automation,Henan Polytechnic University,Jiaozuo 454003,China;School of Electrical Engineering,Xi’an University of Technology,Xi’an 710048,China)

机构地区：[1]河南理工大学电气工程与自动化学院,焦作454003 [2]西安理工大学电气工程学院,西安710048

出　　处：《电力系统及其自动化学报》2023年第12期1-11,共11页Proceedings of the CSU-EPSA

基　　金：国家自然科学基金资助项目(52177114);河南省自然科学基金资助项目(212300410147);河南省高校基本科研业务费专项资金资助项目(NSFRF210443);河南理工大学青年骨干教师资助计划项目(2022XQG-15)。

摘　　要：针对含恒功率负荷的改进下垂控制直流微电网系统大扰动稳定问题,本文基于混合势函数理论,提出一种适用于改进下垂控制的直流微电网系统稳定性判据推导方法。通过推导得到稳定性判据,给出恒功率负荷稳定运行边界和储能变换器下垂系数及幂指数的取值上界。该判据能够良好地反映改进下垂控制的直流微电网系统大扰动稳定性与储能变换器下垂系数及幂指数取值间的关联,为系统控制参数的选取提供了重要参考。仿真验证了所提方法和稳定性判据的正确性。Aimed at the large-disturbance stability problem of DC microgrid system with constant-power load under the improved droop control,a derivation method of stability criterion for DC microgrid system under the improved droop control is proposed on the basis of the mixed potential function theory.The stability criterion is obtained through derivation,and the stable operation boundary of constant-power load and the upper bounds of droop coefficient and power exponent of an energy storage converter are also given.This criterion can accurately reflect the relationship between the large-disturbance stability of DC microgrid system under the improved droop control and the values of droop coefficient and power exponent of the energy storage converter,which provides an important reference for the selection of control parameters of the system.The proposed method and the stability criterion are verified by simulation results.

关 键 词：直流微电网 SOC幂指数下垂控制 混合势函数 大扰动稳定性 恒功率负荷 

分 类 号：TM46[电气工程—电器]