含跟网和构网型新能源发电单元的混联电力系统暂态同步稳定分析

Transient Synchronization Stability Analysis of Hybrid Power System With Grid-following and Grid-forming Renewable Energy Generation Units

在新能源发电单元与同步发电机共同接入的混联电力系统中,不同同步方式新能源间,新能源与同步发电机间耦合复杂,深刻影响系统的暂态同步稳定性。为揭示电网对称短路故障下不同发电单元间的动态耦合机理及其对系统暂态同步稳定性的作用机制,该文首先建立故障条件下混联系统的暂态稳定分析数学模型。随后,利用空间矢量图示法与相平面法分析跟网型新能源发电单元注入电流、锁相环参数以及构网型新能源发电单元有功控制环参数等因素对混联系统内各发电单元暂态同步稳定性的影响规律,并据此给出系统控制器参数的设计原则。最后,通过不同工况下的仿真验证理论分析的正确性。

In a hybrid power system where renewable energy generation units and synchronous generators are jointly connected,the interaction between renewable energy with different synchronization modes,and between renewable energy and synchronous generators are all complex,deeply affecting the transient synchronization stability of the hybrid system.To reveal the dynamic coupling mechanism among different generation units under symmetrical grid fault and its impact on the transient synchronization stability of the system,this paper firstly establishes a mathematical model for transient stability analysis of a hybrid systems.Subsequently,the space vector graphical method and phase portrait method are used to analyze the impact of injection current and phase-locked loop parameters of grid following renewable energy generation units,power control loop parameters of grid forming renewable energy generation units on the transient synchronization stability of the hybrid system in detail.Based on this,the design principles of system controller parameters are given.Finally,the correctness of the theoretical analysis is verified through simulations under different operating conditions.