摘要
【目的】为应对新能源装机占比日益增长的新型电力系统低惯量、弱阻尼引发的频率稳定问题,确保电力系统稳定运行,提出了光储并网系统多主体参与的频率主动支撑协调控制策略,以满足配置储能的光伏系统不同运行工况下的频率调控需求。【方法】所提方法根据同步机的功率调节裕度与不平衡功率分析了不同工况下系统的调频需求,设计了并网逆变器自同步控制策略,在主动支撑惯量的同时传递频率变化信息;提出了计及调频死区的光储系统多时间尺度调频控制策略,根据同步机功率调节裕度设计了光伏调频死区值,并结合储能荷电状态约束设计了其控制参数及自适应恢复策略。【结果】光储并网系统实时数字仿真结果表明,相较于现有控制方式下的调频效果,所提控制策略在不同扰动工况下,频率最低点均能提升10%以上,显著改善了系统的频率调节性能。【结论】所提光储并网系统多主体参与的频率主动支撑协调控制策略,使光储系统具备不同扰动工况下惯量支撑与一次调频自适应切换的功能,在保证系统频率稳定的同时充分发挥了同步机的调频能力,同时使储能自适应恢复至初始运行状态,有效提升了系统在不同工况下的频率稳定性。
[Objective]To cope with the frequency stability problems caused by the low inertia and weak damping of new power systems with an increasing proportion of new energy installations and to ensure the stable operation of the power system,a coordinated control strategy for the active frequency support of a photovoltaic storage grid-connected system with the participation of multiple subjects is proposed to meet the frequency regulation requirements under different operating conditions of the photovoltaic systems configured with energy storage.[Methods]The proposed method analyzes the frequency regulation demand of the system under different operating conditions according to the power regulation margin and unbalanced power of the synchronous machine and designs a self-synchronous control strategy for the grid-connected inverter that transmits the frequency change information while proactively supporting inertia.It proposes a multi-timescale frequency regulation control strategy for a photovoltaic storage system that considers the dead zone of the frequency regulation.The proposed method designs the value of the dead zone of the photovoltaic frequency regulation based on the power regulation margin of the synchronous machine and designs its control parameter and self-service control strategy based on the storage state of the energy charge.It designs the control parameters and adaptive recovery strategy based on the power regulation margin of the synchronous machine.[Results]The real-time digital simulation results of the grid-connected photovoltaic storage system showed that compared with the frequency regulation effect under the existing control method,the proposed control strategy could improve the frequency minimum point by more than 10%under different disturbing conditions,significantly improving the frequency regulation performance of the system.[Conclusions]The proposed coordinated control strategy of frequency active support for a grid-connected optical storage system with the participation of multiple subjects enables the optical storage system to have the adaptive switching function of inertia support and primary frequency regulation under different disturbing conditions,giving full play to the frequency regulation capability of the synchronous machine while ensuring the frequency stability of the system.Simultaneously,the energy storage adaptively recovers to the initial operating state,effectively improving the frequency stability of the system under different operating conditions.
作者
江守其
张海峰
付贵
辛业春
王丽馨
JIANG Shouqi;ZHANG Haifeng;FU Gui;XIN Yechun;WANG Lixin(Key Laboratory of Modern Power System Simulation and Control&Renewable Energy Technology,Ministry of Education(Northeast Electric Power University),Jilin 132012,Jilin Province,China;State Grid Jilin Electric Power Company Jilin Power Supply Company,Jilin 132011,Jilin Province,China)
出处
《电力建设》
北大核心
2025年第8期138-149,共12页
Electric Power Construction
基金
国家自然科学基金项目(52207078,U2066208)。
关键词
光储并网系统
自同步
惯量支撑
一次调频
频率稳定
photovoltaic and energy storage grid-connected system
self-synchronization
inertia support
primary frequency regulation
frequency stability
