Abstract
This paper presents the solution to the security-constrained unit commitment (SCUC) problem for hybrid voltage source converter (VSC) based multi-terminal DC/AC (VSC-MTDC/AC) power systems with high penetration of wind generation. The formulated SCUC model presents a detailed representation of the VSCs with two different VSC control strategies considered, constant DC voltage control (master-slave control) and DC voltage droop control. In addition, Grid Code for wind farm connection is considered. Benders decomposition is used to solve the formulated SCUC problem by decomposing it into a master problem for solving unit commitment (UC) and hourly transmission security check subproblems. The final SCUC solution provides an economic and secure operation and control strategy for the meshed MTDC/AC system. Numerical tests illustrated the efficiency of the proposed SCUC model.
Highlights
With the growing concerns about climate change, emissions and environmental issues of competing energy sources, many countries have made great progress in the development of renewable sources of energy, including wind power, in order to meet part of electricity power demand [1]
The control flexibility of the voltage source converter (VSC) is perfectly suited for constructing a multi-terminal HVDC (MTDC) system providing a more rational and efficient solution for the interconnection of wind farms positioning at different locations [3]
An earlier work modelled the hybrid AC/DC systems in the unit commitment (UC) problem to analyze the impact of HVDC transmission systems on the economic operation of AC transmission systems, without considering the security constraints [7]
Summary
With the growing concerns about climate change, emissions and environmental issues of competing energy sources, many countries have made great progress in the development of renewable sources of energy, including wind power, in order to meet part of electricity power demand [1]. VSC-MTDC systems’ control strategies, such as master control [15] and DC voltage drop control [16], are highly flexible In both control modes, setting of the corresponding control parameters may change the power flow in the DC network, and the connected AC system, impacting the scheduling cost of the entire DC/AC system in terms of the SCUC. The dispatch center will send hourly schedules to the AC system and control strategies to wind farm companies and TRANSCOs. To the best knowledge of the authors, no study has yet addressed the SCUC problem for the meshed VSCMTDC/AC systems with grid-connected wind generation.
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