Frequency Control of Island VSC-HVDC Links Operating in Parallel with AC Interconnectors and Onsite Generation - 2017


The main scope of this paper is to propose a appropriate frequency management scheme for high-voltage dc-links (HVDC) based mostly on voltage supply converters (VSCs), operating in island systems with on-web site typical generation and external ac interconnectors. The proposed droop-sort and inertia emulator is built upon the facility synchronization control (PSC) concept, where grid synchronization is achieved while not the necessity of an ardent synchronization unit. The dynamics of the proposed PSC-based mostly scheme are assessed both in frequency and time domain, utilizing a sensible study-case system, which corresponds to the current designing for the interconnection of Crete to the Greek mainland system, involving ac and dc interconnectors operating in parallel with standard native thermal units. To demonstrate the advantages offered by the proposed controller in the context of frequency response, a close average worth model is developed for the VSC-HVDC link in MATLAB/Simulink, where severe contingencies are simulated, such as the sudden loss of the external ac interconnector or local generation, leading from mainland grid-connected to islanded operation.

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