Asymmetrical high voltage ride through control strategy of grid-side converter for grid-connected renewable energy equipment

2014 International Power Electronics and Application Conference and Exposition Pub Date : 2014-11-01 DOI:10.1109/PEAC.2014.7037906

Ruiqi Li, H. Geng, Geng Yang

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引用次数: 12

Abstract

For grid-connected renewable energy equipment, asymmetrical high voltage swell threatens the grid-side converter (GSC) and the dc-link capacitor. Asymmetrical high voltage swell may cause significant fluctuations across the dc-link voltage, and energy reflux of the GSC, even result in the runaway of the GSC. To cope with this situation, the control strategy of the GSC has to be improved. Firstly, the controllability of the GSC is analyzed considering the asymmetrical high voltage swell situation and the converter power rating. Afterwards, an asymmetrical high voltage ride through (HVRT) control strategy is proposed by considering the reactive current compensation and the dc-link voltage fluctuations, which needs to raise the dc-link voltage in certain cases. However, increasing the dc-link voltage sometimes is not practical for the rating of the physical devices and the product cost. Therefore, the asymmetrical HVRT grid code has to be formulated carefully considering the operation capability of the GSC. The simulation experiments verified that the GSC can be controllable and the dc-link voltage is stable.

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并网可再生能源设备并网侧变流器不对称高压穿越控制策略

对于并网可再生能源设备，不对称高压膨胀对并网变流器和直流电容构成威胁。不对称的高压膨胀会引起直流链路电压的显著波动，导致GSC的能量回流，甚至导致GSC的失控。为了应对这种情况，必须改进GSC的控制策略。首先，考虑非对称高压膨胀情况和变流器额定功率，分析了GSC的可控性。然后，提出了一种考虑无功电流补偿和直流电压波动的不对称高压穿越(HVRT)控制策略，该策略在某些情况下需要提高直流电压。然而，提高直流链路电压有时对物理设备的额定值和产品成本是不切实际的。因此，在制定非对称HVRT电网规范时，必须考虑到GSC的运行能力。仿真实验验证了GSC是可控的，直流链路电压稳定。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2014 International Power Electronics and Application Conference and Exposition

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