arXiv 2401.022022024-01-04eess.SYcs.SY

一种带有阻尼支路的纯积分型锁相环以增强弱电网下并网逆变器的稳定性

A Pure Integral-Type PLL with a Damping Branch to Enhance the Stability of Grid-Tied Inverter under Weak Grids

Yi Zhou, Zhouchen Deng, Shi Chen, Yiwei Qiu, Tianlei Zang, Buxiang Zhou

备注：: 4 pages, 6 figures

AI总结：

针对超弱电网下功角接近90°时PLL同步逆变器因强非线性耦合导致等效阻尼恶化而失稳的问题，提出带阻尼支路的纯积分型锁相环（IPLL）替代传统PI型PLL，实现等效阻尼与稳态功角解耦，使系统在平衡点存在时稳定运行，并通过时域仿真验证了其有效性。

摘要：

在锁相环（PLL）同步逆变器中，由于PLL参数与运行功角之间存在强非线性耦合，在超弱电网下当功角接近90°时，等效阻尼系数会迅速恶化，导致同步失稳。为解决此问题，本文提出了一种带阻尼支路的纯积分型锁相环（IPLL）来替代传统的PI型PLL。IPLL同步逆变器的等效阻尼系数与稳态功角解耦。因此，只要平衡点存在，IPLL同步逆变器就能在超弱电网下稳定运行。最后，时域仿真结果验证了所提IPLL的有效性与正确性。

英文摘要：

In a phase-locked loop (PLL) synchronized inverter, due to the strong nonlinear coupling between the PLL's parame-ters and the operation power angle, the equivalent damping coefficient will quickly deteriorate while the power angle is close to 90° under an ultra-weak grid, which causes the synchronous instability. To address this issue, in this letter, a pure integral-type phase-locked loop (IPLL) with a damping branch is proposed to replace the traditional PI-type PLL. The equivalent damping coefficient of an IPLL-synchronized inverter is decoupled with the steady-state power angle. As a result, the IPLL-synchronized inverter can stably operate under an ultra-weak grid when the equilibrium point exists. Finally, time-domain simulation results verify the effectiveness and correctness of the proposed IPLL.

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摘要：

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