Abstract
Recent advances in data sensing and processing technologies enable data-driven control of high-voltage direct-current (HVDC) systems for improving the operational stability of interfacing power grids. This paper proposes an optimal data-driven control strategy for an HVDC system with line-commutated converters (LCCs), wherein the dc-link voltage and current are optimally regulated at distinct HVDC terminals to improve frequency regulation (FR) in both rectifier- and inverter-side grids. Each HVDC converter is integrated with feedback loops for regulation of grid frequency and dc-link voltage in a localized manner. For optimal FR in both-side grids, a data-driven model of the HVDC-linked grids is then developed to design a data-driven linear quadratic Gaussian (LQG) regulator, which is incorporated with the converter feedback loops. Case studies on two different LCC HVDC systems are performed using the data-driven models, which are validated via comparisons with physics-based models and comprehensive Matlab/Simulink models. The results of the case studies confirm that the optimal data-driven control strategy successfully exploits the fast dynamics of HVDC converters; moreover, cooperation of the HVDC system and synchronous generators in both-side grids is achieved, improving real-time FR under various HVDC system specifications, LQG parameters, and inertia emulation and droop control conditions.
Highlights
High-voltage direct-current (HVDC) systems have been widely used in modern power grids, and can provide long transmission distances, asynchronous grid connection, and fast and flexible converter control [1]
An linecommutated converters (LCCs) HVDC system has been installed in the Midwest area of the United States to transfer approximately 25% of the power generated by wind turbines, with a total capacity of 16 GW, to the Eastern Interconnection [4]
This paper proposes an optimal data-driven control strategy for an LCC HVDC system, wherein the dc-link voltage and current are optimally regulated at distinct HVDC terminals via primary (PFC) and secondary frequency control (SFC) to improve real-time frequency regulation (FR) in both rectifier- and inverter-side grids
Summary
Idci_ref VdScr _ref dc voltage reference at the rectifier [pu] dc current reference at the inverter [pu] dc voltage reference at the rectifier from LQG controller [pu]. Kim: Optimal Data-Driven Control of an LCC HVDC System for Real-Time Grid FR α, γ. Wr , Wi Tfr , Tfi firing and extinction angles at the rectifier and inverter [◦] frequency droop gain for the rectifier and inverter dc-link voltage droop gain for the rectifier and inverter IRE gain for the rectifier and inverter time constant of low pass filter at the rectifier and inverter
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
