一种风电接入对两区域电网功角稳定性的影响因素的分析方法

An Analysis Method for the Influence Factors of Wind Power Access on the Stability of Power Angle of Two-Region Power Grid

摘要: 本文提出了一种风电接入对两区域电网功角稳定性的影响因素的分析方法。首先将风机以负阻抗的形式接入到电力系统中；然后根据系统的潮流方程，得到两区域发电机的电磁功率特性曲线，并进一步等值为单机电磁功率；根据风电接入量和两区域同步机分配率的不同，得到两区域同步机的机械功率，并进一步等值为单机机械功率；从等值单机的角加速度的变化量出发，考虑网络拓扑结构、风电接入位置、两区域发电机转动惯量比例、两区域发电机分配率和风电接入比例对系统暂态稳定的影响。本文提出的方法可指导最优的风电接入，以使对电力系统稳定性的影响最小，并且在两区域系统仿真中验证了本文所提方法的正确性。

Abstract: This paper presents an analysis method for the influence factors of wind power access on the stability of power grids in two regions. Firstly, the fan is connected to the power system in the form of negative impedance; then according to the power flow equation of the system, the electromagnetic power characteristic curve of the two-region generator is obtained, and further equivalent to the single-machine electromagnetic power; according to the wind power access amount and the two regions and the difference of the distribution rate of the synchronous machine, the mechanical power of the two-zone synchronous machine is obtained, and the equivalent value is the mechanical power of the single machine. Starting from the variation of the angular acceleration of the equivalent single machine, the influence of the network topology, the wind power access position, the two-region power generation’s machine moment of inertia ratio, the two-zone generator distribution rate and the wind power access ratio on system transient stability are considered. The proposed method can guide the optimal wind power access to minimize the impact on the stability of the power system, and verify the correctness of the proposed method in the simulation of the two-region system.