基于功率自主同步的构网型光伏逆变器控制

Control of Grid-forming Photovoltaic Inverter Based on Power Self-synchronization

构网型光伏逆变器(PV-GFM)可通过预留备用容量实现对电网的有功、无功支撑,并可在一定条件下独立构网为关键负载提供稳定的电压和频率。此处详细讨论了无储能支撑的PV-GFM控制策略及其实现方式,并依托某新能源基地完成了PV-GFM示范运行。系统性开展了PV-GFM参与电网主动支撑、并离网切换、独立黑启动以及多机组并联构网等试验,取得了良好的示范应用效果。试验结果显示:PV-GFM在提升新能源并网友好性、电压/频率独立支撑能力等方面具有明显优势,为大规模新能源接入稳定运行提供技术解决途径。

Grid-forming photovoltaic inverters(PV-GFM)can realize active and reactive power support for the power grid by reserving spare capacity,and can provide stable voltage and frequency for critical loads independently under certain conditions.The control strategy and realization of PV-CFM without energy storage support are discussed in de-tail,and the demonstration operation of PV-GFM based on a demonstration base is completed.The tests of PV-CFM participating in active support,off-grid switching,independent black start and multi-unit parallel grid construction have been systematically carried out,and good demonstration and application results have been achieved.The test re-sults show that the PV-GFM has obvious advantages in improving the grid-connected friendliness of new energy and the independent support ability of voltage/frequency,etc.,which provides a technical solution for the stable operation of large-scale new energy access.