同步发电机不同实用模型对暂态稳定极限准确性的影响

电力系统暂态分析常用的发电机模型是在Park方程基础上引入不同假设得到的假设A和假设B实用模型。为了研究两种实用模型对同步发电机暂态稳定极限计算结果准确性的影响,以单机无穷大系统为例对两种实用模型计算的暂态稳定极限进行对比分析,并用经过实验验证的时步有限元结果对其进行校核;对比分析了发电机与系统强弱连接时,不同发电机模型所计算的暂态稳定极限的差异。通过分析得出,假设A计算的暂态稳定极限功率与时步有限元模型结果更接近,因此该模型更为准确。

Transient Stability Limit Affected by Different Practical Models of Synchronous Generator

There are two popular practical models of synchronous generator used in power system transient simulation,both of them are based on Park equations and can be defined as assumed A and assumed B,according to the different assumptions.In order to study the influence of different models on the calculation precision of transient stability,single-machine infinite system is taken for example to compare the transient stability calculated by two practical models,and the simulation results are verified by time-step finite element model (T-S FEM).The results show that the transient stability calculated by assumed A is close to that calculated by T-S FEM,thus the transient stability limit calculated by assumed A is more accurate.