针对大规模风电接入导致电力系统调频空间不足以及动态响应低的问题,提出一种新型频率协调控制策略。首先,在双馈感应发电机（DFIG）减载备用的运行方式下,通过引入下垂控制来改进桨距角控制,当系统频率下降时释放DFIG减载备用功率,从而弥补了DFIG转子转速恢复过程中有功功率的跌落,减小了系统稳态频率偏差。其次,通过加入机械功率补偿环节来改进虚拟惯量控制,释放DFIG转子中储备的部分动能为系统频率的动态响应提供支撑,增强了系统的惯性,减小了系统动态频率偏差。最后,通过Matlab/Simulink搭建电力系统仿真模型,仿真结果表明,该策略有效抑制了负荷变化导致系统频率的波动,提高了系统频率的稳定性。
Abstract
Aiming at the problems of insufficient frequency regulation space and low dynamic response of the power system caused by large-scale wind power access, this paper proposes a new frequency coordination control strategy. Firstly, under the load-shedding reserve operation mode of doubly fed induction generator （DFIG）, pitch angle control is enhanced by introducing droop control. When system frequency drops, the DFIG releases its load-shedding reserve power, thereby compensating for the active power dip during DFIG rotor speed recovery and reducing steady-state frequency deviation in the system. Secondly, by incorporating a mechanical power compensation stage to enhance virtual inertia control, the system releases part of the kinetic energy stored in the DFIG rotor to support dynamic frequency response. This boosts system inertia and reduces dynamic frequency deviation. Finally, a power system simulation model was built through Matlab/Simulink. The simulation results show that this strategy effectively suppressed the fluctuation of system frequency caused by load changes and improved the stability of system frequency.
关键词
风力发电机 /
频率控制 /
系统稳定性 /
虚拟惯量控制 /
桨距角控制
Key words
wind turbines /
frequency control /
system stability /
virtual inertia control /
pitch angle control
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基金
宁夏自然科学基金（2025AAC030626）; 宁夏师范大学校级科研项目基金（XJYB2329）
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