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Optimization strategy of DSOGI-PLL precision under harmonic interference conditions

机译:谐波干扰条件下Dsogi-PLL精度的优化策略

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Grid inverters can extract accurate fundamental signal with dual second-order generalized integrator phase-locked loop (DSOGI-PLL) under generalized harmonic grid voltage. The oriented voltage extracted by DSOGI will fluctuate when there are a large amount of low order harmonics in the power grid, which declines the performance of DSOGI. The complex vector model for DSOGI is established, and the mechanism that output voltage of the traditional DSOGI-PLL contains harmonic can be analyzed. According to the orthogonal characteristics of SOGI, the orthogonal harmonic elimination method (OHEM) is derived to achieve a better elimination on harmonics with successive differential of harmonic grid voltage. MATLAB simulation shows that the fundamental positive and negative sequence voltage and phase angle can be obtained effectively with proposed method under distorted grid voltage.
机译:网格逆变器可以在广泛的谐波电网电压下用双二阶通用积分器锁相环(Dsogi-PLL)提取精确的基波信号。 Dsogi提取的面向电压在电网中有大量低次谐波时会波动,这达到了Dsogi的性能。建立了DSOGI的复杂向量模型,可以分析传统的DSogi-PLL电压包含谐波的机制。根据Sogi的正交特性,导出了正交谐波消除方法(OHEM),以实现与谐波电网电压连续差分的谐波更好地消除。 MATLAB仿真表明,在扭曲电网电压下的提出方法可以有效地获得基本正序列电压和相位角。

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