【摘要】 近年来，由于电网系统中电力电子装备的渗透率水平不断提高，逐渐深刻改变了电网系统的暂态运行特性。本文针对构网型并网变换器进行研究，分析了构网型并网变换器与电力系统之间的功率传输关系，推导了构网型并网变换器的功角方程和等效转子方程，揭示其工况条件和系统策略对其同步运行过程的影响规律。同时，确定了构网型并网变换器的平衡点稳定运行范围，并分析构网型并网变换器的同步过程与失步现象。评估了构网型并网变换器的稳定性，得到了故障阶段构网型并网变换器的等面积判据。最后，对本文的研究结论进行仿真验证。更多还原

【Abstract】 With the increasing proportion of renewable energy power plants in the power system, the transient synchronization mechanism of traditional power system is gradually undergoing profound changes. This paper takes the grid forming(GFM) renewable energy power generation as the research object. Based on the interaction between GFM system and power grid, the equivalent rotor swing equations and the power angle characteristic equation are proposed, which reveal the effects of control parameters and operation status on the general output characteristics of the system. Furthermore, the controllable operation area of output power instruction is derived. The synchronization mechanism and instability pattern of GFM system are described, and the corresponding equivalent area criterion is proposed. Finally, this paper proposed a variable damping coefficient-based stability control strategy to help the GFM system have the self-balanced capability, and thus significantly enhanced the transient synchronization stability of GFM system. The theoretical analysis is verified by simulations and experiments.更多还原