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中文摘要：
为了抑制微电网中多台并网逆变器间因相互耦合所引发的谐波谐振,提出了一种有源阻尼器及其控制方法。有源阻尼器通过对其并网点处电压和电流中的谐波分量进行检测和反馈控制,改变和重塑微电网内的谐波阻抗,向谐波网络引入足够的电阻和电导分量,从而有效地阻尼谐波谐振的发生。由于有源阻尼器仅针对高次谐波电流进行补偿和抑制,可以大幅降低其额定容量。因此,在不改变微电网中并网逆变器软硬件结构的情况下,可以利用一个小容量的有源阻尼器变流器装置灵活地治理微电网内的谐波谐振。利用PSCAD/EMTDC的仿真结果验证了所提方法的正确性和有效性。
英文摘要：
A kind of AD（Active Damper） and its control scheme are presented to suppress the harmonic resonance induced by the coupling among multiple grid-connected inverters in a microgrid,which detects the harmonic components of voltage and current at PCC and carries out the feedback control to change and reshape the harmonic impedance of microgrid by introducing enough virtual resistance and conductance to the harmonic network for the effective suppression of harmonic resonance. Since the AD mainly compensates and suppresses the high-order harmonic currents,its power rating can be greatly reduced. Therefore,a smallcapacity AD equipment can be used to flexibly treat the harmonic resonance of microgrid,without changing the hardware and software structures of its grid-connected inverters. The effectiveness and validation of the proposed AD are verified by the results of PSCAD / EMTDC simulation.
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