Optimal Allocation of Distributed Synchronous Condensers Considering Voltage Support Capability Enhancement in HVDC Sending-End AC Power System
CSEE Journal of Power and Energy Systems（2025）SCI 2区SCI 3区
School of Electrical Engineering and Automation
Abstract
This paper introduces an innovative optimal allocation method for distributed synchronous condensers (DSCs) in the high voltage direct current (HVDC) sending-end AC power system, designed to significantly enhance the system voltage support capability and effectively suppress the overvoltage issues. With the increasing integration of large-scale renewable energy sources (RESs) into the HVDC sending-end AC power system, the system short-circuit ratio and voltage support capability are compromised, which may easily cause the prominent overvoltage problem after the HVDC fault. Our method addresses these challenges by not only enhancing the system voltage support capability but also suppressing the overvoltage problems. The impact of DSCs on multiple renewable energy stations short circuit ratio (MRSCR) of the system is analyzed, and a comprehensive quantitative evaluation index of voltage support capability that can quantitatively represent the system voltage support capability enhancement after installing DSCs is defined. A multi-objective optimization model for DSCs allocation is proposed with the objectives of simultaneously minimizing the investment cost and maximizing the system voltage support capability enhancement. The optimal installation positions and configuration quantities (capacities) of DSCs are then obtained by solving the optimization model. Simulation studies conducted on a practical power system demonstrate the method's effectiveness in maximizing system voltage support capability enhancement, suppressing overvoltage issues, and offering superior economic performance compared to the centralized synchronous condensers (CSCs) configuration method.
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Key words
distributed synchronous condenser,optimal allocation,HVDC sending-end AC power system,MRSCR,voltage support capability enhancement
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