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<p>Modern power systems having bulk renewable power integration via inverters are facing frequency instability issues today. This research work proposes an effective dual-droop control strategy for offering enhanced primary frequency support to asynchronous AC grids interconnected with VSC-based multi-terminal (VSC-MTDC) systems. It uses a dynamic value of frequency droop coefficient that varies according to disturbed or healthy state of the interconnected grids. In disturbed state, the VSC can offer frequency mitigation, by applying proposed frequency droop coefficient derived after negating mutual droop interaction in between P–<i>V</i><sub>dc</sub> and <i>P</i>–<i>f</i> droop. Also, frequency support from healthier grids can be quantified to a desirable value by using proposed <i>Power Support Index</i>. Additionally, considering headroom availability of VSC power transfer capability, design of dual-droop coefficients is proposed that keeps frequency &amp; DC voltage deviations within limits. It is demonstrated that the proposed technique is capable enough to mitigate credible contingencies, e.g., for a 10% load increase, additional 38.1% active power support is offered via proposed control which is just 32.5% via conventional strategy. Also, for a 40% loss in wind power input, it is shown that DC voltage &amp; frequency deviations are lesser and within permissible limits in comparison.</p>

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An effective dual-droop control for voltage source converter-based multi-terminal DC system

  • 期刊论文

  • 发表日期：

    2025年6月26日

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  • Ashima Taneja,
  • Radheshyam Saha,
  • Madhusudan Singh

摘要

Modern power systems having bulk renewable power integration via inverters are facing frequency instability issues today. This research work proposes an effective dual-droop control strategy for offering enhanced primary frequency support to asynchronous AC grids interconnected with VSC-based multi-terminal (VSC-MTDC) systems. It uses a dynamic value of frequency droop coefficient that varies according to disturbed or healthy state of the interconnected grids. In disturbed state, the VSC can offer frequency mitigation, by applying proposed frequency droop coefficient derived after negating mutual droop interaction in between P–Vdc and P–f droop. Also, frequency support from healthier grids can be quantified to a desirable value by using proposed Power Support Index. Additionally, considering headroom availability of VSC power transfer capability, design of dual-droop coefficients is proposed that keeps frequency & DC voltage deviations within limits. It is demonstrated that the proposed technique is capable enough to mitigate credible contingencies, e.g., for a 10% load increase, additional 38.1% active power support is offered via proposed control which is just 32.5% via conventional strategy. Also, for a 40% loss in wind power input, it is shown that DC voltage & frequency deviations are lesser and within permissible limits in comparison.