适用于弱电网的单相并网逆变器改进IPT-PLL技术
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江西工程学院

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江西省教育厅省级教改项目(XGJ-2016-28-6),江西省高等学校教学研究项目(JXJG-09-63-3)


A modified SRF-PLL technology for single-phase grid-connected inverters in weak grid
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Jiangxi Institute of Engineering

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    摘要:

    针对弱电网普遍存在的直流偏置、频率变化等问题,提出一种适合单相并网逆变器的改进反Park变换锁相环(IPT-PLL)技术。首先在鉴相环节,选用Park变换后的α分量为基准电压,解决电网电压直流偏置问题,采用1/4基波周期延时的方法构造其正交分量。其次,引入拉格朗日插值多项式逼近分数阶延时,以降低频率变化造成的延时计算误差,并理论分析了PI调节器的设计方法。最后用实验验证了所提改进IPT-PLL频率适应性强,能明显抑制电网直流偏置干扰,且具有较好的动静态性能。

    Abstract:

    Aiming at the problems of DC bias and frequency variation in weak power grid, an improved inverse Park transform phase-locked loop (IPT-PLL) technology suitable for single-phase grid connected inverter is proposed. Firstly, in the phase detector, α component of Park transformation is used as a reference voltage to solve the problem of DC bias in power grid voltage. The orthogonal component is constructed by the method of 1/4 fundamental periodic delay. Meanwhile, the fractional delay is approximated by Lagrange interpolation polynomial to reduce the delay calculation error caused by frequency change. Secondly, the design method of regulator in PLL is analyzed. The experimental results show that the proposed improved IPT-PLL has frequency adaptability, can significantly suppress the interference of DC bias in the grid voltage. And the dynamic and static performance of the proposed PLL is good.

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  • 收稿日期:2022-05-13
  • 最后修改日期:2022-09-02
  • 录用日期:2022-07-15
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