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As an important indicator in the voltage source converter based multi-terminal direct current (VSC-MTDC) system, DC voltages should be regulated in a proper range for both the safe operation and active power balance. In this paper, an improved voltage droop control strategy, which adjusts the droop gain adaptively according to the deviation of the DC side voltage of the converter and the common reference voltage introduced in this strategy, is applied in the droop VSC and influences the active power injected to the converter. With proposed control strategy, the active power injected to the converter will respond quickly with the DC voltage fluctuation of the converter to suppress DC voltage oscillation significantly and so improve DC voltage quality of MTDC systems. A three-terminal MTDC system is established in PSCAD/EMTDC. The effectiveness and feasibility of the proposed improved voltage droop control strategy is verified by simulation results under both the steady condition and transient condition.
Inspec keywords: power system simulation; HVDC power convertors; voltage-source convertors; voltage control; power system transients; power grids; power supply quality
Subjects: DC-AC power convertors (invertors); Power engineering computing; Power electronics, supply and supervisory circuits; d.c. transmission; Voltage control; Power system control; AC-DC power convertors (rectifiers); Control of electric power systems; Power supply quality and harmonics