论文标题
基于直流电压反馈的网格形成转换器控制
Grid-Forming Converters control based on DC voltage feedback
论文作者
论文摘要
可再生能源通过电源电子转换器连接到电网，这使得丢失了同步发电机/机器（SM）的惯性。可再生能源在电力系统中的渗透率增加会削弱频率和电压稳定性。网格形成转换器（GFC）通过控制方法模拟同步电动机的功能，以通过提供惯性和稳定性调节机制来提高功率网格的稳定性。这种转换器控制方法包括虚拟同步机，可计划的虚拟振荡器控制等。这些控制方法主要使用交流侧状态反馈，并且不监视直流侧状态。本文分析了GFC考虑电网稳定性的控制策略，包括频率下垂控制，虚拟同步机控制和可调度的虚拟振荡器控制。当发生较大的负载干扰时，发现直流侧电压塌陷问题。提出了考虑到DC侧电压反馈的GFC的控制方法，这可以确保网格连接的同步特性并解决DC侧电压塌陷的问题。 IEEE-9总线系统验证了所提出的方法，该方法显示了所提出的方法的有效性。
The renewable energy is connected to the power grid through power electronic converters, which are lack of make the inertia of synchronous generator/machine (SM) be lost. The increasing penetration of renewable energy in power system weakens the frequency and voltage stability. The Grid-Forming Converters (GFCs) simulate the function of synchronous motor through control method in order to improve the stability of power grid by providing inertia and stability regulation mechanism. This kind of converter control methods include virtual synchronous machine, schedulable virtual oscillator control and so on. These control method mainly use AC side state feedback and do not monitor the DC side state. This paper analyzes the control strategy of GFC considering power grid stability, including Frequency Droop Control, Virtual Synchronous Machine Control and dispatchable Virtual Oscillator Control. The DC side voltage collapse problem is found when a large load disturbance occurs. The control methods of GFC considering DC side voltage feedback are proposed, which can ensure the synchronization characteristics of grid connection and solve the problem of DC side voltage collapse. The proposed method is verified by IEEE-9 bus system, which shows the effectiveness of the proposed method.
