柔性直流系统自适应惯性和阻尼模拟的自同步解耦控制策略  

Self Synchronous Decoupling Control for Adaptive Inertia and Damping Simulation of MMC-HVDC Systems

作　　者：江守其 李卓易 李国庆[1] 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(Northeast Electric Power University),Ministry of Education,Jilin 132012,Jilin Province,China)

机构地区：[1]现代电力系统仿真控制与绿色电能新技术教育部重点实验室(东北电力大学),吉林省吉林市132012

出　　处：《电网技术》2024年第7期3067-3074,I0118,共9页Power System Technology

基　　金：吉林省科技发展计划项目(20220508014RC)。

摘　　要：为了解决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,定量地分析了柔性直流输电系统可用能量及其主动支撑系统惯量的可行性,提出了计及电容能量裕度的受端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电网惯量。在此基础上,考虑直流电压安全约束对电容能量裕度利用的影响,提出了柔性直流系统自适应惯性和阻尼模拟的自同步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转动惯量,进一步利用电容能量裕度提升其惯量支撑能力;引入阻尼控制环节,实现频率偏差调节同时提升控制系统的稳定性,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 instability caused by the low inertia characteristics of an electronic power system,this paper quantitatively analyzes the available energy of a MMC-HVDC system and its feasibility in actively supporting the system inertia from the perspective of exploring the regulation potential of the power grid transmission link.A self synchronization control strategy for the receiving end converter station that takes into account the capacitor energy margin is proposed,which achieves the self synchronization without the phase-locked loop and actively supports the inertia of the receiving end power grid.On this basis,considering the impact of the DC voltage safety constraints on the utilization of capacitor energy margin,a self synchronous decoupling control strategy and the parameter design method for adaptive inertia and damping simulation of MMC-HVDC systems are suggested.Through adaptively adjusting the inserted number of the sub-modules and the Moment of inertia,the capacity of the inertia support is further improved by using the capacitor energy margin.By introducing the damping control,the frequency deviation adjustment is achieved while improving the stability of the control system.The effectiveness of the proposed control strategy is verified through the real-time digital simulation.

关 键 词：柔性直流输电 自同步控制 频率响应 惯性与阻尼模拟 自适应调制 

分 类 号：TM721[电气工程—电力系统及自动化]