【Key words】 static var compensator； voltage synchronization； phase locked loop； synchronous reference frame；
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Based on the derived model, the factors affecting TCSC transient characteristics are discussed. Also the transient mechanism of TCSC is revealed under capacitor voltage synchronization mode.
借助该模型可分析影响暂态过程的相关因素，进而从本质上揭示了电容电压同步下TCSC的暂态机理。
The proposed method doesn't need hardware synchronization circuit and can perform the calculation of fundamental positive sequence component of the supply voltage in real time.
这种方法不需要硬件同步电路，能实时地计算电源电压中的基波正序分量。
Test results of simulation system show that grid-connected voltage is synchronization with grid phase voltage.
通过对光伏并网系统的测试表明：并网电压与电网相电压同频同相。
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