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Power oscillation damping with virtual capacitance support from modular multilevel converters

机译：从模块化多级转换器使用虚拟电容支持的功率振荡阻尼

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摘要

Power oscillation damping (POD) is one of the ancillary services expected from high-voltage direct current (HVDC) converters. When providing POD to the ac side, converters draw power from the dc side, which can cause distortion to the dc voltage especially in the case of limited dc capacitance. In meshed/multi-terminal HVDC grids, where dc voltage regulation is distributed using a dc voltage droop control strategy, the distortion due to the POD controller action is propagated to other connected ac grids because of the droop action. This propagation can be reduced by using the inherent energy storage capability of the modular multilevel converter (MMC), which is a common converter topology for HVDC. Different methods to utilise the energy stored in the MMC for the purpose of POD have been proposed in the literature. This study presents a detailed analysis and experimental validation of one of these methods, referred to as virtual capacitance support, which increases the effective dc grid capacitance by using the stored energy of multiple MMCs connected in the same grid. The experiments, which were carried out using power hardware in the loop setup, demonstrated the effectiveness of the method.
机译：功率振荡阻尼（POD）是从高压直流（HVDC）转换器的辅助服务之一。当向AC侧提供POD时，转换器从DC侧汲取电力，这可能导致DC电压失真，特别是在DC电容的情况下。在网状/多终端HVDC网格中，其中使用DC电压下垂控制策略分布DC电压调节，由于POD控制器动作引起的失真由于下垂动作而传播到其他连接的AC电网。通过使用模块化多级转换器（MMC）的固有能量存储能力，可以减少该传播，这是HVDC的公共转换器拓扑。在文献中提出了利用存储在MMC中的能量的不同方法。该研究提出了一种如此的详细分析和实验验证，其中一个方法是虚拟电容支持，其通过使用连接在同一网格中的多个MMC的存储能量来增加有效的DC网格电容。使用电源硬件在环路设置中进行的实验证明了该方法的有效性。

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