適用微網(wǎng)故障穿越的多功能并網(wǎng)變換器研究
[Abstract]:Microgrid is an effective way to exert the efficiency of distributed power generation. One of the key problems that need to be solved is the low voltage traversing capacity of microgrid (low voltage ride through LVRT) and the guarantee of normal local load power supply. Serious overcurrent is produced when the fault of power network side exceeds the requirement of low voltage crossing, which will affect the safe operation of grid-connected inverter and critical load. Combined with the microgrid structure, a hybrid AC / DC microgrid and its grid-connected device topology are proposed. When the fault voltage is within the range required by LVRT, the dynamic voltage regulator (dynamic voltage restorer (DVR) of the resonant controller type (modified proportional resonance can ensure the stable operation of the local load. When the fault voltage exceeds the requirement of LVRT, the overcurrent is suppressed by virtual impedance control. The switching strategies of microgrid and grid-connected converters in different operation modes under different types of faults are established. Finally, the simulation results verify the correctness of the proposed topology and control strategy.
【作者單位】: 國(guó)家電能變換與控制工程技術(shù)研究中心(湖南大學(xué));長(zhǎng)沙理工大學(xué)電氣與信息工程學(xué)院;
【基金】:國(guó)家自然科學(xué)基金項(xiàng)目(51377051)~~
【分類(lèi)號(hào)】:TM46
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