基于扰动观测的构网型柔直系统阻尼控制器设计  

Disturbance Observer-based Damping Controller of Grid-forming VSC-HVDC Systems

作　　者：王炜宇 张一平 李帅虎 陈宇翔 于佳琪 李晨光 曹一家[1] WANG Weiyu;ZHANG Yiping;LI Shuaihu;CHEN Yuxiang;YU Jiaqi;LI Chenguang;CAO Yijia(State Key Laboratory of Disaster Prevention&Reduction for Power Grid(Changsha University of Science&Technology),Changsha 410114,Hunan Province,China;School of Electronic Information and Electrical Engineering,Changsha University,Changsha 410022,Hunan Province,China)

机构地区：[1]电网防灾减灾全国重点实验室(长沙理工大学),湖南省长沙市410114 [2]长沙学院电子信息与电气工程学院,湖南省长沙市410022

出　　处：《电网技术》2024年第6期2262-2271,I0005,I0006,共12页Power System Technology

基　　金：国家自然科学基金项目(52307077,52207076,U23B20128);湖南省教育厅优秀青年项目(21B0325)。

摘　　要：构网型柔直逆变器具有惯性支撑能力,可对低惯性电网进行频率支撑,但也具有类似同步发电机的振荡特性,系统受扰后构网型逆变站易参与电网振荡,导致振荡范围扩大。首先构建了构网型逆变站和受端电网的简化状态空间模型,基于奇异值分解技术研究了控制器参数、柔直并网位置以及电网惯量分布对交直流系统振荡特性的影响,确定了两区域系统中柔直的最佳并网位置。接着利用构网型逆变站对电网扰动的主动响应能力,设计了基于扩展状态观测技术的振荡阻尼控制器(disturbance observer-based damping controller,DODC),利用构网型逆变站自身的量测对交直流混联系统的关键状态进行实时估计,并利用二次型最优反馈控制实现关键振荡模态阻尼抑制。最后通过DIgSILENT/PowerFactory-MATLAB联合仿真模型对所提控制策略的有效性进行了验证。The grid-forming converter can provide inertia support to the AC grid,improving the system's frequency stability.However,the grid-forming converter also inherits the oscillatory characteristics,which make the converter participate in the oscillations triggered by grid disturbances and result in a broader oscillation range.grid inverter has inertia support capability,providing frequency support for low inertia power grids.A simplified state-space model of the grid-forming inverter station connected with the receiving power grid was constructed.Based on singular value decomposition,the effects of controller parameters,integration position,and inertia distribution on the oscillation characteristics of the AC/DC system were studied,and the optimal integration position was obtained.Then,utilizing the autonomous response of the grid-forming inverter to grid disturbances,a disturbance observer-based damping controller(DODC)based on extended state observation technology was designed.The key states of the AC/DC hybrid system were estimated in real time using the local measurements of the grid-forming inverter,and the quadratic optimal feedback control was used to dampen the critical oscillation modes.The effectiveness of the proposed control strategy is verified through the co-simulation of DIgSILENT/PowerFactory and MATLAB.

关 键 词：柔性直流输电系统 振荡阻尼 构网型控制 扰动观测器 二次型最优控制 

分 类 号：TM721[电气工程—电力系统及自动化]