摘要
针对混合微电网交直流母线接口变换器采用下垂控制存在惯性小、阻尼低等问题,提出一种适用于接口变换器的虚拟同步电机控制策略。该控制策略不仅可使交直流母线接口变换器具有下垂控制的稳态特性,而且可使其呈现类似于同步电机的动态频率响应特性,有效提高交直流混合微电网对交流频率及直流电压的抗扰动特性。该文分析混合微电网瞬时功率平衡特性,基于此,提出利用交、直流微电网电源和负荷吞吐特性为交流频率和直流电压提供惯性,并设计相应的控制策略。建立所提控制策略的小信号模型,详细分析转动惯量、阻尼系数、直流下垂系数等关键参数对系统稳定性的影响及有功功率变化时交流频率和直流电压的动态响应,据此给出系统关键控制参数设计方法。最后,分别利用Matlab/Simulink软件和dSPACE实验平台验证所提控制策略的有效性。
To solve the problems of small inertia and damping for interfacing converter between AC bus and DC bus with droop control in hybrid AC/DC micro-grid, a virtual synchronous motor control strategy for the interfacing converter was proposed. The dynamic characteristic of frequency, which was similar to the synchronous motors, was combined with the steady-state characteristics of droop control for the interfacing converter. Anti-disturbance characteristics of AC frequency and DC voltage were improved. Based on the analysis of instantaneous power balance characteristics in hybrid AC/DC micro-grid, the control strategy was designed, in which inertia was provided by using the absorbing-releasing characteristics of various sources and loads in AC and DC sub-grids. In order to design the control parameters,small-signal model was built and effects of critical parameters,including rotating inertia, damping coefficient and DC droop coefficient, on stability and dynamic response of frequency and DC voltage during active power changing were analyzed. The effectiveness and functions were verified based on Matlab/Simulink and dSPACE platform.
作者
李峰
秦文萍
任春光
王祺
韩肖清
王金浩
LI Feng;QIN Wenping;REN Chunguang;WANG Qi;HAN Xiaoqing;WANG Jinhao(Shanxi Key Laboratory of Power System Operation and Control (Taiyuan University of Technology),Taiyuan 030024,Shanxi Province,China;Electric Power Research Institute,State Grid Shanxi Electric Power Company,Taiyuan 030001,Shanxi Province,China)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2019年第13期3776-3787,共12页
Proceedings of the CSEE
基金
国家自然科学基金项目(U1610121,51777132)
国网山西省电力公司科技项目(52053017000G)~~
关键词
交直流混合微电网
交直流母线接口变换器
虚拟同步电机
小信号模型
hybrid AC/DC micro-grid
interfacing converter between AC bus and DC bus
virtual synchronous motor
small-signal model
