基于相位误差切换的并网逆变器并离网切换策略研究

Research on parallel off grid switching strategy of grid connected inverter based on phase error switching

在可再生能源快速发展的大背景下,微电网系统能够给大电网带来较高灵活性的能量调度。微电网系统具有并网和孤岛离网两种工作方式,并网时通过并网逆变器向大电网注入交流能量,孤岛离网时能够作为小型电网向附近用电单位供电,但是两种工作方式的切换会给大电网带来能量冲击。对此,文章提出一种相位误差切换的控制策略,实现并离网两种工作方式的平滑切换,以减小对电网带来的冲击。仿真和实验结果证明了所提控制策略的有效性。

Under the background of the rapid development of renewable energy,the establishment of microgrid system can bring more flexible energy scheduling to the large power grid.Microgrid system has two working modes:grid-connection and isolated island off-grid.During grid-connection,AC energy is injected into the large power grid through grid-connected inverter.When isolated island off-grid,it can supply power to nearby power users as a small power grid,but the switching of the two working modes will bring energy impact to the large power grid.In this paper,a phase error switching control strategy is proposed to realize the smooth switching between the two working modes of grid-connected and off-grid switching,so as to reduce the impact on the power grid.Simulation and experimental results show the effectiveness of the proposed strategy.