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首页> 外文期刊>Power Electronics, IET >Effects on oscillation mechanism and design of grid-voltage feedforward in grid-tied converter under weak grid
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Effects on oscillation mechanism and design of grid-voltage feedforward in grid-tied converter under weak grid

机译：弱电网对并网换流器振荡机理的影响及电网电压前馈的设计

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摘要

Grid-voltage feedforward control is widely used in grid-tied converters. The reported studies show that the grid-voltage feedforward may reduce the system stability margin, and may lead to oscillation problem in renewable power generation system. This study revisits the effect of voltage feedforward control on system stability and especially focuses on low frequency oscillation with impedance-based method. The low frequency oscillation usually happens in industry around 100 Hz and shows frequency coupling characteristics. A converter equivalent impedance which includes the effects of voltage feedforward and also covers the frequency coupling introduced by phase locked loop (PLL) is established. Based on the built impedance, the effect on oscillation mechanism with voltage feedforward and PLL is revealed. The results show that the voltage feedforward could increase the system stability margin and may be employed to improve the system stability. Then how to design an optimal proportional voltage feedforward control is demonstrated. Experimental results verify the theoretical analysis and the design of the proportional grid-voltage feedforward control.
机译：并网电压前馈控制广泛应用于并网变流器。报道的研究表明，电网电压前馈可能会降低系统稳定性裕度，并可能导致可再生能源发电系统出现振荡问题。这项研究重新审视了电压前馈控制对系统稳定性的影响，并特别着重于基于阻抗的低频振荡。低频振荡通常在工业中发生在100 Hz附近，并显示出频率耦合特性。建立了转换器等效阻抗，该等效阻抗包括电压前馈的影响，并且还涵盖了锁相环（PLL）引入的频率耦合。基于建立的阻抗，揭示了电压前馈和PLL对振荡机制的影响。结果表明，电压前馈可以增加系统稳定性裕度，可用于提高系统稳定性。然后说明了如何设计最佳比例电压前馈控制。实验结果验证了理论分析和比例电网电压前馈控制的设计。

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