摘要
针对电力电子化电力系统低惯量特性引起的频率稳定问题,从挖掘电网输电环节调控潜力的视角出发,提出了提升柔性直流系统惯量主动支撑能力的自同步解耦控制策略。定量分析了利用柔性直流系统能量裕度提升系统惯量水平的可行性,提出了计及子模块电容和电感元件能量裕度的换流站自同步控制策略,在实现无锁相环自同步的同时主动支撑受端系统惯量;在此基础上,为了解决现有控制中直流电压安全约束限制电容能量利用的问题,提出了柔性直流系统直流电压与子模块电容电压解耦控制策略及参数设计方法,通过自适应调节子模块投入数量与电容电压参考值,实现柔性直流系统内储能元件能量裕度的充分利用,并设计了其恢复策略及启动判据,有效提升了受端系统惯量水平和频率稳定性。定量评估了柔性直流系统的惯量支撑能力,并通过实时数字仿真验证了所提控制策略的有效性。
Aiming at the frequency stability problem caused by the low inertia characteristics of electronic power system,a self synchronous decoupling control strategy is proposed to enhance the active inertia support capability of flexible DC system from the perspective of tapping the regulation potential of power grid transmission link.Quantitative analysis is conducted on the feasibility of utilizing the energy margin of a flexible DC system to improve the inertia level of the system.A self-synchronization control strategy for the converter station is proposed,which takes into account the energy margin of submodule capacitor and inductance component.The strategy actively supports the inertia of the receiving power grid while achieving self-synchronization without phase-locked loop.On this basis,in order to solve the problem of DC voltage safety constraints limiting the utilization of capacitor energy in existing control system,the decoupling control strategy and parameter design method of DC voltage and submodule capacitor voltage of flexible DC system are proposed,through adaptively adjusting the submodule input quantity and capacitance voltage reference,the energy margin of energy storage element in flexible DC system is fully utilized.The recovery strategy and start-up criterion are designed to effectively improve the inertia level and frequency stability of the receiving power grid.The inertia support capability of the flexible DC system is quantitatively evaluated,and the effectiveness of the proposed control strategy is verified by real-time digital simulation.
作者
江守其
李卓易
李国庆
辛业春
王丽馨
JIANG Shouqi;LI Zhuoyi;LI Guoqing;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,China)
出处
《电力自动化设备》
EI
CSCD
北大核心
2024年第8期130-137,175,共9页
Electric Power Automation Equipment
基金
国家电网公司总部科技项目(5108-202299258A-1-0-ZB)。
关键词
柔性直流系统
有效转动惯量
电压源型控制
自适应解耦控制
最大惯量支撑
flexible DC system
effective moment of inertia
voltage source control
adaptive decoupling control
maximum inertia support
