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首页> 外文期刊>IEEE Transactions on Energy Conversion >Transient Stability Enhancement Control Strategy Based on Improved PLL for Grid Connected VSC during Severe Grid Fault
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Transient Stability Enhancement Control Strategy Based on Improved PLL for Grid Connected VSC during Severe Grid Fault

机译：基于改进PLL的瞬态稳定性增强控制策略在严重网格故障期间综合升压VSC

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摘要

In this article, the transient synchronization process of the grid-connected voltage source converters (VSC) is studied detailly. Firstly, the phase-locked loop (PLL)-synchronized VSC is modeled according to the rotor motion equation of synchronous generator (SG). Furthermore, the VSC's damping ratio is derived, and the effects of the VSC's control parameters and the operation status on the equivalent power angle (EPA) is investigated. Moreover, the influence of the PLL's parameters and the voltage dips degree on the VSC's transient frequency behavior are analyzed. Analysis result reveals that the VSC's damping ratio decreases once the grid voltage drops, so that the EPA and frequency of the VSC may appear large overshoot and oscillation, which may trigger the frequency protection and deteriorate the VSC's transient stability. In order to ensure that the VSC can smoothly operate to new equilibrium points, an improved PLL is proposed, which can adaptively adjust the VSC's damping ratio for different voltage sags. The proposed method can not only reduce the overshoot of the EPA but also restrain the VSC's frequency dips degree. Finally, the simulations and experimental tests validate the effectiveness of the theoretical analysis.
机译：在本文中，详细研究了网格连接电压源转换器（VSC）的瞬态同步过程。首先，根据同步发电机（SG）的转子运动方程，锁相环（PLL） - 同步VSC。此外，研究了VSC的阻尼比率，并且研究了VSC的控制参数和操作状态对等效电力角（EPA）的影响。此外，分析了PLL参数的影响和VSC的瞬态频率行为上的电压下降程度。分析结果表明，VSC的阻尼比率一旦电网电压降低，使得VSC的EPA和频率可能会出现大的过冲和振荡，这可能触发频率保护并降低VSC的瞬态稳定性。为了确保VSC可以平稳地运行到新的平衡点，提出了一种改进的PLL，这可以自适应地调节VSC的阻尼比对于不同的电压凸起。所提出的方法不仅可以减少EPA的过冲，而且还会限制VSC的频率下降程度。最后，模拟和实验测试验证了理论分析的有效性。

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