热力发电2024，Vol.53Issue(8)：85-93,104,10.DOI:10.19666/j.rlfd.202403038
弱电网下多源构网型变流器协同控制方法
Cooperative control method of multi-source grid-forming converters in weak electrical grids
摘要
Abstract
Virtual Synchronous Generator(VSG),as one of the primary technologies in grid-forming controls,provides inertia support to the power grid.However,due to the limited capacity of individual converters,when larger inertia support is required,multiple VSGs must run in parallel,making the coordinated control of multiple VSGs a subject of significant interest.In this regard,a state-space model for multiple VSGs in parallel is established,and the system stability is analyzed through the eigenvalues of the state variable matrix.Concurrently,a coordinated control strategy for multiple VSGs based on model predictive control is proposed,which introduces the angular frequency deviation and power angle difference as performance indicators to design the objective function.The optimal active power increment required is solved,and the output angular frequency is dynamically adjusted through the power-frequency coefficient,enabling active support for the output frequency and effectively suppressing system frequency fluctuations caused by VSG paralleling,thus the grid stability is enhanced.The results indicate that,compared with the conventional VSG paralleling systems,the proposed MPC-VSG parallel control method can shorten the transient response time of the system and improve its robustness under transient conditions.The simulation result confirms the effectiveness of the proposed approach.关键词
构网型变流器/虚拟同步发电机/状态空间模型/模型预测控制/惯量支撑Key words
grid-forming converter/virtual synchronous generator/state space model/model predictive control/inertia support引用本文复制引用
刘硕,李佳远,马速良,沙广林,李成新..弱电网下多源构网型变流器协同控制方法[J].热力发电,2024,53(8):85-93,104,10.基金项目
北京市科技新星计划(Z211100002121081) Beijing Nova Program(Z211100002121081) （Z211100002121081）
