MGP系统参与新能源电网调频的实验研究

新能源并网易受电网扰动的影响而发生脱网,同时会导致电网惯性和频率调节能力降低,给电力系统的稳定性带来了严峻的挑战。同步电机对(Motor-Generator Pair,MGP)系统是一种有效的解决方案。本文建立了MGP系统数学模型,分析新能源通过MGP并网的功率传输特性和变流器控制原理。在此基础上,研究了MGP系统参与新能源电网调频的作用机理,并在容量为5kW的MGP实验平台进行了实验验证。实验结果表明,MGP系统在电网频率变化时可以向电力系统提供有效的有功功率支撑,有利于提高电网的稳定性。

Experiment Analysis on Motor-Generator Pair System for Participating in Frequency Modulation of Power System with Renewable Energy

Renewable energy grid-connection is vulnerable to disconnection due to grid disturbances and leads to the reduction of grid inertia and frequency modulation ability at the same time,which bring severe challenges to the stability of power system.Motor-Generator Pair(MGP)system is an effective solution to this problem.In this paper,the mathematical model of MGP system was established,and the power transmission characteristics and converter control principle of MGP system were analyzed.On this basis,the mechanisms of MGP system participating in frequency modulation in renewable energy grid were studied,and then experiments were carried out on the 5kW MGP experimental platform to verify its effectiveness.The experimental results showed that MGP system could provide active power support effectively when the frequency of power grid changed,which was conducive to improving the stability of power grid.