基于VSG的HVDC逆变侧MMC的控制技术研究

VSG-based MMC Control Technology of HVDC Inverse Side WANG Haiming

采用基于高压直流输电逆变侧模块化多电平换流器(Modual Multilevel Conveter,MMC)的虚拟同步发电机控制方法,使得直流输电系统逆变侧变换器能够模拟同步发电机运行,为交流电网提供惯性和阻尼.建立了虚拟同步发电机的电气及机械模型,仿真实现了虚拟同步发电机控制在MMC上的控制方法.仿真结果表明,直流输电系统逆变侧MMC采用虚拟同步发电机(Virtual Synchronous Generator,VSG)控制技术,能够提供一定的惯性和阻尼,较好地实现对交流系统的有功-频率控制和无功-电压控制.

The method of VSG-based MMC control technology of HVDC inverse side is presented in the paper, and it can provide inertia and damping for AC grids by making the transformer of HVDC inverse side simulate the synchronous generator operation. The electric and mechanical models of synchronous generator are established. The MMC control method is emulated and the results demonstrate that this method can provide inertia and damping to some extent, which can fulfill the control of active-power-frequency and reactive-power-voltage.