电网技术2025，Vol.49Issue(9)：3603-3612,中插14-中插19,16.DOI:10.13335/j.1000-3673.pst.2024.1232
基于q轴虚拟功率构造的构网型变流器功率振荡抑制策略
q-axis Virtual Power Construction-based Power Oscillation Suppression Strategy for Grid-forming Converters
摘要
Abstract
Low-frequency oscillations may occur in the output active power of the grid-forming converters,whilst the traditional control strategies for suppressing power oscillation introduce additional steady-state deviations of the output active power,or require reliance on an additional detection unit to obtain the angular frequency of the grid voltage.Moreover,when the grid impedance changes,there is also the risk of power oscillations if inappropriate control parameters are used.In response to the above issues,this paper proposes an active power oscillation suppression control strategy based on q-axis virtual power construction.Firstly,the circuit analysis leads to the conclusion that the q-axis component of the voltage at the point of common coupling(PCC)contains information about the difference between the converter's output angular frequency and the grid voltage's angular frequency.Based on the conclusion,a virtual power is constructed using the q-axis voltage.A filter is introduced to filter out the influence of high-frequency components on the system.Meanwhile,it is pointed out that the constructed power can be equivalent to the output of the quasi-resonant controller with the input as the q-axis voltage.Based on the complex torque coefficient method,the mechanism of the proposed strategy to suppress power oscillations is analyzed.Furthermore,through establishing small-signal models,it shows that the proposed strategy does not change the active power-frequency steady-state droop characteristic of the converter,and the design method for key control parameters is given.Finally,the simulation and experimental results obtained from the PSCAD/EMTDC and hardware-in-the-loop(HIL)platform verify the advantages of the proposed control strategy.关键词
构网型变流器/虚拟同步发电机/振荡抑制机理/q轴虚拟功率构造/有功功率振荡抑制Key words
grid-forming converters/virtual synchronous generator(VSG)/mechanism of oscillation suppression/q-axis virtual power construction/active power oscillation suppression分类
信息技术与安全科学引用本文复制引用
梁营玉,王亚琴,杨洋,李浩..基于q轴虚拟功率构造的构网型变流器功率振荡抑制策略[J].电网技术,2025,49(9):3603-3612,中插14-中插19,16.基金项目
中央高校基本科研业务费专项资金资助项目(No.2024JCCXJD01).Project Supported by the Fundamental Research Funds for the Central Universities(No.2024JCCXJD01). （No.2024JCCXJD01）
