电机串联新能源并网系统的控制方法及其运行模式

Research of the Control Methodand Operating Pattern for the Motor-Generator Pair( MGP) Grid-Connected System

随着新能源并网渗透率的不断提高,同步发电机被并网逆变器替换造成的系统惯性大幅减少,引发新能源电力系统的稳定性问题越来越严重。为了提升新能源并网惯性,提出了基于电动机-发电机串联(MGP)的并网系统。首先通过分析双机机端电压及励磁电动势相位关系,确定MGP系统传输新能源发出的有功功率与电机参数之间的关系,建立了改变源网相位差的控制方法,以控制MGP系统的有功传输,实现对MGP系统的功率闭环控制。接着对MGP系统的稳定运行模式进行了研究,提出一个可以利用源网相位控制方法来运行的模式。在该模式下,MGP系统可以稳定传输有功功率。最后通过仿真和实验验证了该控制方法的可行性。

With the increasing penetration of renewable energy grid, a sharply reduce of inertia of power system due to the replacing of synchronous generator is threatening the renewable energy power systems. For the purpose of enhancing the stability of power grid, this paper proposes a stability solution based on motor-generator pair （MGP ） system. Firstly, the relationship between the active power and the motor parameters is analyzed by analyzing the phase relationship between MGP terminal voltage and the excitation potential, and then model the closed-loop source-grid phase control method which controlling active power transport by changing the voltage phase difference between the renewable source and power grid. T h e n, the operating pattern of M G P system is discussed, and a pattern which stabling MGP system is proposed, which enable the M G P system to transmit active power stably with source-grid phase control method. Finally, simulation and experimental verification of the feasibility of the control method of the present invention is proposed.