Large-scale renewable energy integration and consequent displacement of synchronous machines result in low system inertia. Low system inertia leads to high rate of change of frequency, higher frequency nadir, and potentially require higher primary frequency reserve to stabilise system frequency following a sudden generation shortfall. To address such frequency stability issue in wind energy integrated system, this paper has proposed a new and realistic control strategy for inertial and primary frequency support from HVDC connected Offshore Wind Farms (OWF). The proposed control strategy, which is based on offshore AC voltage control is not only addressing limitations of high rate of frequency change in the offshore grid, but also does not result in any frequency deviation in the offshore grid while providing frequency support to the main grid. The proposed control strategy is robust for any frequency deviation in the main grid, which utilises HVDC converters to map onshore frequency variation in to voltage variation in the offshore grid, thus enabling adequate inertial and primary frequency support from the OWF. The proposed control strategy has been tested on two test systems and the results are compared with conventional method to demonstrate the robustness, effectiveness and reliability of the proposed frequency support strategy.

中文翻译：

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低惯性系统中的高压直流输电离岸风电场快速频率支持的新控制方案

大规模的可再生能源整合以及随之而来的同步电机排量导致系统惯性低。低系统惯量导致频率变化率高，频率最低点更高，并可能在突然出现发电不足之后需要较高的主频率储备来稳定系统频率。为了解决风能集成系统中的这种频率稳定性问题，本文提出了一种新的，现实的控制策略，用于连接海上风电场（HVDC）的HVDC的惯性和主频率支持。所提出的基于海上交流电压控制的控制策略不仅解决了海上电网的高频率变化率的局限性，而且在为主电网提供频率支持的同时也不会导致海上电网出现任何频率偏差。 。所提出的控制策略对于主电网中的任何频率偏差都是鲁棒的，该策略利用HVDC转换器将陆上频率变化映射到海上电网中的电压变化，从而可以从OWF获得足够的惯性和主频率支持。所提出的控制策略已在两个测试系统上进行了测试，并将结果与​​常规方法进行了比较，以证明所提出的频率支持策略的鲁棒性，有效性和可靠性。