Abstract
The modular multilevel converter (MMC), as a new type of voltage source converter, is increasingly used because it is a distributed storage system. There are many advantages of using the topological structure of the MMC on a unified power quality controller (UPQC), and voltage sag mitigation is an important use of the MMC energy storage system for the power quality compensation process. In this paper, based on the analysis of the topology of the MMC, the essence of energy conversion in a UPQC of voltage sag compensation is analyzed; then, the energy storage characteristics are calculated and analyzed to determine the performance index of voltage sag compensation; in addition, the simulation method is used to verify the voltage sag compensation characteristics of the UPQC; finally, an industrial prototype of the UPQC based on an MMC for 10 kV of medium voltage distribution network has been developed, and the basic functions of UPQC have been tested.
Highlights
Ensuring power quality is one of the requirements of a power system operation
This paper presented the unified power quality controller (UPQC) based on the modular multilevel converter (MMC)
Due to the modular topology of the MMC and the characteristics of distributed energy storage, it is very suitable for the voltage sags compensation of the UPQC
Summary
Ensuring power quality is one of the requirements of a power system operation. The sensitivity to the change of power characteristics of modern industrial, commercial, and residential electrical equipment such as high performance office equipment, precision experimental instruments, variable frequency speed control equipment, programmable logic controllers, various automatic production lines, and computer systems is increasing year by year. Because the MMC topology has unique characteristics, namely the ability to spread the energy storage unit in each module, the ease of meeting the requirements of the storage capacity, and the relative ease of manufacturing it, the MMC has the characteristics of modular, distributed energy storage, and its energy storage characteristics are an important influence on the voltage sag compensation of a UPQC. Through the analysis of the topology and equivalent model, put forward control strategy of UPQC, the performance index of unified power quality controller using energy storage characteristics to achieve voltage sag compensation is calculated and analyzed, and the simulation results are given
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