考虑发电机凸极效应的机网接口算法研究

A New Algorithm for Machine Network Interface Considered the Generator Convex Effect

提出了一种在电力系统暂态稳定仿真计算中考虑发电机凸极效应的机网接口新算法,在暂态稳定仿真计算中通过预估d、q轴上电抗相等点的虚拟电势,获得d、q轴电抗相等的定子绕组电压方程,该方程经d、q轴变换后并入电网求解时即可的到线性、时不变的电网导纳矩阵。同时通过构造电网与发电机组的仿真模型,导出仿真模型的交替求解计算方法。弥补了传统机网接口算法计算量大、收敛速度慢的不足,简化了机网交替求解算法中电网方程组的计算工作,并可拓展推广应用于数模转换计算与暂态稳定仿真的其他研究中。

In this article,a new machine interface algorithm considering the convex effect of generator is presented in the simulation calculation of power system transient stability.The voltage equation of stator winding with equal d and q axial reactance is obtained by estimating the virtual potential of reactance equality points on d and q axes in transient stability simulation calculation.When the d and q axis is transformed into the power grid solution the equation can be integrated into the linear and time-invariant grid admittance matrix.At the same time,the alternating solution calculation method of simulation model can be derived by constructing the simulation model of power grid and generator unit.The power grid equations calculation has been simplified in the alternating solution algorithm of machine network interface,and it may develop the promotion to apply in the digital-analog conversion computation and in the transition condition stable simulation other research.