Before diode rectifier (DR) technology for connecting offshore wind farms (OWFs) to HVdc is deployed, in-depth studies are needed to assess the actual capabilities of DR-connected OWFs to contribute to the secure operation of the networks linked to them. This study assesses the capability of such an OWF to provide communication-less frequency support (CLFS) to an onshore ac network. It is shown that the HVdc link's offshore terminal direct voltage can be estimated from measurements at the OWF's point of connection with the DR platform. Two different methods are proposed for implementing CLFS in the OWF active power controls. In Method 1, the estimated offshore terminal direct voltage is used for estimating the onshore frequency deviation. In Method 2, the actual offshore terminal direct voltage measurement is used instead. Unique features of the provision of CLFS from OWFs connected to HVdc via DRs are highlighted, and the dynamic and static performance of the CLFS control scheme is compared to that of the communication-based frequency support scheme. To assess the impact of parameter estimation errors on the provision of CLFS, a parametric sensitivity study is presented as well, and recommendations are given to increase accuracy.

中文翻译：

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通过二极管整流器连接到HVdc的海上风电场的通信频率降低支持

在部署用于将海上风电场（OWF）连接到HVdc的二极管整流器（DR）技术之前，需要进行深入的研究，以评估与DR连接的OWF的实际功能，从而为与其相连的网络的安全运行做出贡献。这项研究评估了这种OWF为陆上交流网络提供无通信频率支持（CLFS）的能力。结果表明，可以通过OWF与DR平台的连接点处的测量值来估计HVdc链路的离岸终端直流电压。提出了两种不同的方法来在OWF有功功率控制中实现CLFS。在方法1中，估算的离岸终端直流电压用于估算陆上频率偏差。在方法2中，使用实际的海上终端直流电压测量代替。强调了从通过DR连接到HVdc的OWF提供CLFS的独特功能，并将CLFS控制方案的动态和静态性能与基于通信的频率支持方案的动态和静态性能进行了比较。为了评估参数估计误差对CLFS提供的影响，还进行了参数敏感性研究，并提出了提高准确性的建议。