中国电机工程学报2016，Vol.36Issue(2)：350-359,591,11.DOI:10.13334/j.0258-8013.pcsee.2016.02.005
基于非线性干扰观测器的直流微电网母线电压控制
A Nonlinear Disturbance Observer Based DC Bus Voltage Control for a DC Microgrid
摘要
Abstract
A nonlinear disturbance observer (NDO) used for the DC bus voltage control system of the bidirectional DC-DC converter was investigated to quickly track power disturbances in the DC microgrid, without any additional voltage and current sensors, which is beneficial for the scalability and plug-play of the distributed generators (DGs) and DC loads within the DC microgrid. Based on this observer, feedforward method was proposed to suppress the fluctuations and impacts of the DC bus voltage during transients. When the DC microgrid contains three-phase unbalanced AC loads or connects to the AC grid through a single-phase DC-AC converter, the DC bus voltage and the output current of the DC-DC converter which used to control the DC voltage will contain low frequency ripple which is twice the AC load’s or the grid frequency, which may affect the system stability. In order to eliminate the current ripple, band-pass filter based on a second-order generalized integrator (SOGI) was adopted. The performance of the presentd control strategy was verified in a prototype DC microgrid including a DC simulated voltage source, a DC load, a three-phase unbalanced AC load and a bi-directional DC-AC converter.关键词
直流微电网/直流母线电压控制/非线性干扰观测器/DC-DC双向变流器/二阶通用积分器Key words
DC microgrid/DC bus voltage control/nonlinear disturbance observer (NDO)/DC-DC bi-directional converter/second-order generalized integrator (SOGI)分类
信息技术与安全科学引用本文复制引用
李霞林,郭力,冯一彬,王成山,刘梦璇..基于非线性干扰观测器的直流微电网母线电压控制[J].中国电机工程学报,2016,36(2):350-359,591,11.基金项目
国家863高技术基金项目(2015AA050104) （2015AA050104）
国家自然科学基金项目(51507109) （51507109）
天津市科技支撑计划重点资助项目(14ZCZDGX00035). The National High Technology Research and Development Program of China (863 Program)(2015AA050104) （14ZCZDGX00035）
National Natural Science Foundation of China (51507109) （51507109）
Supported by Tianjin Municipal Science and Technology Commission (14ZCZDGX00035). （14ZCZDGX00035）
