摘要
含分布式电源的直流微电网惯性低,负荷功率波动容易诱发直流母线电压稳定性问题,需改进电源控制策略,增大系统惯性,提高电压质量。首先建立直流微电网简化模型,阐述系统惯性的定义和组成,分析恒功率负荷变化对稳定运行点和电量的影响。结合系统稳定运行分析以及等电量原则,提出了适用于直流微电网中风电机组改善电压惯性的控制策略。该策略通过在机侧变流器引入附加功率信号,为直流电网恢复提供附加暂态电量,增大系统惯性支持,有效抑制直流电压波动,提高系统暂态稳定性。最后,在Matlab/Simulink仿真软件中搭建了直流微电网模型,验证所提控制策略的有效性。
DC microgrid containing micro-sources of new energy has low inertia.The load power fluctuation is easy to induce the voltage stability of DC bus.Therefore,it is necessary to improve the power supply control strategy to increase the system inertia and improve the voltage quality.In this paper,a simplified model of DC microgrid is first established,the definition and composition of system inertia are described,and the influences of constant power load variation on stable operation point and electric quantity are analyzed.Based on the analysis of stable operation of the system and the principle of equal quantity of electricity,a control strategy for improving voltage inertia of stroke generator unit in DC microgrid is proposed.In this strategy,additional power signals are introduced into the generator side converter to provide additional transient electric quantity for the recovery of the DC power grid,to increase the inertia support of the system,to effectively suppress the DC voltage fluctuation,and to improve the transient stability of the system.Finally,a DC microgrid model is built in Matlab/Simulink simulation software to verify the effectiveness of the proposed control strategy.
作者
付媛
甄栋夫
张祥宇
赵欣艳
王耀铎
FU Yuan;ZHEN Dongfu;ZHANG Xiangyu;ZHAO Xinyan;WANG Yaoduo(State Key Laboratory of Alternate Electric Power System with Renewable Energy Sources,North China Electric Power University,Baoding 071003,China)
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2022年第1期156-165,共10页
High Voltage Engineering
基金
国家自然科学基金(51607070)
中央高校基本科研业务费专项资金(2018MS90)。
关键词
直流微电网
虚拟惯性
暂态电量
风电机组
恒功率负荷
暂态电量惯性控制
DC microgrid
virtual inertia
transient electric quantity
wind turbines
constant power load
transient electric quantity inertial control
