Journal
IEEE TRANSACTIONS ON POWER SYSTEMS
Volume 33, Issue 2, Pages 1264-1274Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPWRS.2017.2719002
Keywords
Adaptive droop control; frequency regulation; virtual inertia; voltage source converter (VSC); VSC based multi-terminal direct current (VSC-MTDC); voltage droop control
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Funding
- National Natural Science Foundation of China [51520105011, 61233008]
- International Science and Technology Cooperation Program of China [2015DFR70850]
- Key S&T Special Project of Hunan Province of China [2015GK1002]
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This paper proposes an adaptive droop control (ADC) strategy for the voltage source converter (VSC) based multi-terminal high voltage direct current (VSC-MTDC) system, which enables the VSC-station to provide frequency regulation for onshore ac grids. A V-I-f characteristic is derived to establish the relationship between the frequency deviation and dc voltage. A VSC-station working with the V-I-f characteristic is able to adjust its dc voltage reference autonomously according to the grid frequency deviation. Thus, the power flow of the VSC-MTDC system will be redistributed and more power is going to be injected into the adjacent grid of which the frequency deviation exceeds the threshold value. The ADC strategy inherits the advantage of the traditional droop control (TDC) that there is no need for communication system. An ac/dc hybrid system that includes VSC-MTDC system, onshore grids, and offshore wind farms is built in DIgSILENT/Powerfactory. Modal analysis and nonlinear simulations are performed to obtain the optimal control parameters and demonstrate the performance of the ADC strategy.
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