逆变器并联驱动MGP的矢量控制策略

Vector Control Strategy of Parallel Inverters for Driving MGP

超高占比新能源并网将成为我国未来电网的重要结构,已有研究表明新能源经同步电机对(Motor-Generator Pair,MGP)系统接入电网的方式相比于电力电子直接并网会显著增强电网的稳定性。并且考虑到成本、容量等因素,多逆变器汇聚驱动MGP是较理想的控制方案。本文在现有逆变器并联控制算法的基础上,结合MGP的数学模型以及电机的直交轴电流控制理论,采用恒功率控制策略建立了基于无互连线的逆变器并联驱动MGP并网的控制方法,最后搭建了双逆变器并联驱动MGP的仿真模型。仿真结果表明该系统可以实现MGP并网稳定运行的要求,并且该控制策略能够较好地实现各逆变器有功传输的独立可控性。

Super high proportion of renewable energy integration will become an important structure of future power grid, previous studies have made it clear that inverters connecting to the grid through MGP will also enhance the stability in power grid, which performs better than directly connection to grid with power electronics. And considering the factors such as costs and capacity, inverters are connected in parallel to drive the MGP system is an ideal solution. And in this paper, through combining the mathematical model of MGP with d-q axis current control algorithm, we propose a control method of parallel connection of inverters integration via MGP using constant power control strategy with non-interconnection. Finally, the simulation model of parallel drive for MGP with dual inverters is built, and the results show that the control system can meet the demands of stable operation of MGP integration, and it also can achieve independent controllability of the active power transmission of each inverter.