摘要
直流微电网的变换器均通过电力电子变换器接入直流母线,而电力电子变换器缺少惯性和阻尼作用,负载功率突变会引起变换器端口电压电流的振荡,给直流母线带来较大的冲击,影响微电网的稳定性。文中参考虚拟同步发电机在并网逆变器控制中的应用,提出了一种模拟直流发电机特性的储能变换器控制策略,使储能变换器具有直流发电机的端口特性,并建立小信号模型,利用阻抗比判据分析了其小信号稳定性。仿真和实验证明所提控制策略可以增强储能单元维持直流微电网内功率平衡的能力,提高直流微电网的供电质量。
The converters in DC microgrid all access to DC buses through power electronic converters lacking inertia and damping.The sudden change in the load power will cause oscillation of the voltage and current,which is bound to lead to a great surge on the DC bus and affect system stability.With reference to the application of virtual synchronous generator in the grid-connected inverter,this paper proposes a control strategy of energy storage converter which can simulate the DC generator characteristics so that the strategy will enable the DC converters to possess the port characteristics of DC generators.The smallsignal model is developed,and the small-signal stability is analyzed by the impedance ratio criterion.The simulation and experimental results show that the proposed control strategy is able to enhance the capacity of the energy storage unit to maintain the power balance and the quality of power supply in the DC microgrid.
出处
《电力系统自动化》
EI
CSCD
北大核心
2017年第20期126-132,共7页
Automation of Electric Power Systems
基金
陕西省重点研发计划资助项目(2017ZDXM-GY-003)
陕西省自然科学基金资助项目(2017JM5100)~~
关键词
直流微电网
储能变换器
虚拟直流发电机
惯性特性
阻抗比
DC microgrid
energy storage converter
virtual DC generator
inertia property
impedance ratio
