基于VSG的弱同步支撑柔直系统阻尼控制策略  

Damping Control Strategy for Weak Synchronous Support Flexible Straight System Based on VSG

作　　者：李泰 鲁庆华 孙攀磊 芦开平 LI Tai;LU Qing-hua;SUN Pan-lei;LU Kai-ping(XJ Electric Co.,Ltd.,Xuchang 461000,China)

机构地区：[1]许继电气股份有限公司,河南许昌461000

出　　处：《电力电子技术》2025年第4期83-88,共6页Power Electronics

摘　　要：针对传统跟网型PQ控制的柔性直流输电系统(VSC-HVDC)在连接弱交流电网对外表现为低惯量和低阻尼特性,无法满足系统稳定运行的需求,本文提出在柔直系统送端采用VSG控制策略,为电网提供频率和电压支撑。鉴于传统VSG控制阻尼环节引入了调频功能,柔直功率随着电网频率波动而波动,影响系统的稳定运行,为此设计并优化了VSG控制阻尼环节,在满足电网频率突变下阻尼需求的同时,保证了并网运行功率的精准控制。通过构建送端电网与柔直系统的小信号模型和传递函数,给出了控制参数设计原则。最后,基于PSCAD/EMTDC电磁暂态仿真以及渝鄂柔直工程现场试验结果,验证了所提控制策略的有效性。In response to the low inertia and low damping characteristics of the traditional grid connected PQ controlled flexible direct current transmission system(VSC-HVDC)when connected to weak alternating current power grids,which cannot meet the requirements of stable system operation,a VSG control strategy is proposed at the transmission end of the flexible direct current system to provide frequency and voltage support for the power grid.Given that the traditional VSG control damping loop introduces frequency modulation function,the flexible DC power fluctuates with the grid frequency,affecting the stable operation of the system.Therefore,the VSG control damping loop has been designed and optimized to meet the damping requirements under sudden changes in grid frequency while ensuring precise control of grid connected operating power.By constructing a small signal model and transfer function for the transmission end power grid and flexible straight system,control parameter design principles are provided.Finally,the effectiveness of the proposed control strategy is verified based on PSCAD/EMTDC electromagnetic transient simulation and on-site test results of the Chongqing Hubei Flexible Straight Project.

关 键 词：弱交流电网 柔性直流输电 阻尼环节 

分 类 号：TP311[自动化与计算机技术—计算机软件与理论]