与电压源逆变器（VSI）接口的并网分布式电源需要在以下情况下断开电网：1）直流链路电压过高；2）交流电流过大；3）电网电压失步。本文针对光伏发电厂单级和两级并网电压型逆变器的控制问题，研究了不同电网故障下逆变器的解列问题。根据电网规范（GCs）的要求，逆变器控制在电压骤降的情况下包含无功功率支持，以穿越故障并支持电网电压。以一个1兆瓦系统为例，在MATLAB/Simulink软件中进行了仿真，以说明所提出的控制方法。讨论了电网故障时可能出现的问题及相应的补救措施。结果表明，该系统能够穿越不同类型的电网故障。
Grid-connected distributed generation sources interfaced with voltage source inverters (VSIs) need to be disconnected the grid under: 1) excessive dc-link voltage 2) excessive ac currents and 3) loss of grid-voltage synchronization. In this paper, the control of single- and two-stage grid-connected VSIs in photovoltaic (PV) power plants is developed to address the issue of inverter disconnecting under various grid faults. Inverter control incorporates reactive power support in the case of voltage sags based on the grid codes’ (GCs) requirements to ride-through the faults and support the grid voltages. A case study of a 1-MW system simulated in MATLAB/Simulink software is used to illustrate the proposed control. Problems that may occur during grid faults along with associated remedies are discussed. The results presented illustrate the capability of the system to ride-through different types of grid faults.
资源文件列表
GCPPP.mdl , 323048