摘要
为使直流微电网具备一定的故障穿越能力,考虑增强系统对直流母线电压的调节能力,提出了基于电池储能的故障穿越方案。引入基于非线性扰动观测的前馈项,设计了基于储能单元改进下垂控制的直流微电网故障穿越控制策略。这种控制策略可以有效抑制直流母线电压波动,缩短电压调节时间,使直流母线电压保持在安全运行范围内,从而实现直流微电网在直流支路短路故障下的故障穿越。最后在Simulink中搭建有高渗透率光伏发电的直流微电网仿真模型,对所提方案和所设计的故障穿越控制策略进行验证。
To improve the fault ride-through capability of DC micro-grid,a fault ride-through scheme based on battery energy storage is proposed by taking into account the system’s regulating capability of DC bus voltage.A feed-forward term based on a nonlinear disturbance observer is introduced,and a fault ride-through control strategy for DC microgrid based on energy storage units under the improved droop control is designed,which can effectively suppress the DC bus voltage fluctuations,shorten the voltage regulation time,and keep the DC bus voltage within a safe operating range,thereby realizing the fault ride-through of DC microgrid under short-circuit fault in the DC branch.Finally,a simulation model of DC microgrid with high-permeability photovoltaic power generation is established in Simulink,and simulation results verify the proposed scheme and the designed fault ride-through control strategy.
作者
冀婉玉
董玮
张军军
JI Wanyu;DONG Wei;ZHANG Junjun(State Key Laboratory of Operation and Control of Renewable Energy&Storage Systems,China Electric Power Research Institute,Beijing 100192,China)
出处
《电源学报》
CSCD
北大核心
2020年第6期70-76,共7页
Journal of Power Supply
基金
中国电力科学研究院有限公司科技资助项目(NY84-19-002)。
