适用于中低压配电网的VSG多机协同鲁棒运行控制方法

虚拟同步发电机(VSG)作为一种新型电网友好型运行控制方法，通常情况下大多以中低压、多节点分散接入配电网，其存在多类不确定因素以及多机协同运行控制问题，给配电网的安全稳定控制带来了一定的挑战。为此，提出了一种面向中低压配电网的VSG多机协同鲁棒运行控制方法，主要针对协同运行控制中的母线电压跟踪、多机功率均分以及中低压配电网中线路阻抗参数不确定造成的功率耦合不确定和系统设备出力不确定等问题进行了讨论。通过建立VSG并网模型，将不确定功率耦合转化为模型不确定问题进行设计；考虑到中低压配电网中可能存在的拓扑未知和模型阶数较高的问题，通过直接扩张母线电压状态和多机功率均分状态，建立多VSG并网协同控制模型；采用鲁棒控制理论设计整体系统的反馈控制器，抑制模型内部的功率不确定耦合和外部设备不确定出力对控制性能的影响。基于MATLAB/Simulink的仿真模型验证了所提方法的有效性。

Cooperative robust operation control method of multi-VSG available for low-and medium-voltage distribution network

As a new power grid friendly operation control method, VSG(Virtual Synchronous Generator) is generally integrated to distribution network in a decentralized way with multiple low-and medium-voltage nodes. There are many kinds of uncertainties and multi-generator cooperative operation control problems, which pose a certain challenge to the security and stability control of distribution network. For this reason, a cooperative robust operation control method of multi-VSG available for low-and medium-voltage distribution network is proposed, which mainly discusses the problems of bus voltage tracking, active power sharing among multiple generators, uncertainties of power coupling caused by line impedance parameter uncertainties of low-and medium-voltage distribution network, output uncertainties of system equipment, and so on. The uncertain power coupling is transformed into model uncertainties by establishing the VSG grid-connected model. Considering the possible problems of unknown topology and high order of model in low-and medium-voltage distribution network, a multi-VSG grid-connected cooperative control model is established by directly expanding the bus voltage state and the average power distribution state of multiple generators. The feedback controller of the whole system is designed by using robust control theory to suppress the influence of uncertain power coupling inside the model and uncertain output of external equipment on the control performance. The effectiveness of the proposed method is verified by the simulation model in MATLAB/Simulink.