access icon free Coordinated control strategy of multi-terminal VSC-HVDC system considering frequency stability and power sharing

© The Institution of Engineering and Technology
Received 17/12/2018, Accepted 09/10/2019, Revised 11/08/2019, Published 15/10/2019

Aiming at the power sharing among converter stations and the frequency stability of weak AC system connected by converter stations in multi-terminal voltage source converter high-voltage direct current (VSC-HVDC) system, a coordinated control strategy without communication is proposed, which can realise the bidirectional active power support between DC system and weak AC system. The strategy divides the voltage of DC system and the frequency of weak AC system into open-time operation area and time-limited operation area, respectively. When DC voltage and AC frequency are in the open-time operation area, respectively, unbalanced power in the system can be flexibly allocated according to the power margins of converter stations, which reduces DC voltage fluctuation and the influence of DC voltage errors (line length and other factors) among the converter stations on power regulation. When the AC frequency is in the time-limited operation area, the DC system can provide power support for the weak AC system to maintain frequency stability. When the DC voltage is in the time-limited operation area, the weak AC system loses part of the frequency quality to provide short-term power support for the DC system to maintain the stability of VSC-HVDC system as far as possible. The simulation results have verified the feasibility and effectiveness of the proposed control strategy.

Inspec keywords: HVDC power convertors; power transmission control; power grids; HVDC power transmission; power generation control; voltage control; power convertors

Other keywords: weak AC system; frequency stability; power sharing; AC frequency; DC system; coordinated control strategy; multiterminal voltage source converter high-voltage; converter stations; open-time operation area; multiterminal VSC-HVDC system; DC voltage fluctuation; bidirectional active power support; DC voltage errors; time-limited operation area

Subjects: Power system control; Voltage control; Power convertors and power supplies to apparatus; d.c. transmission; Control of electric power systems

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