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Energy Storage Characteristic Analysis of Voltage Sags Compensation for UPQC Based on MMC for Medium Voltage Distribution System

1
State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China
2
State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Baoding 071003, China
3
School of Economy and Management, North China Electric Power University, Beishi District, Baoding 071003, China
*
Author to whom correspondence should be addressed.
Energies 2018, 11(4), 923; https://doi.org/10.3390/en11040923
Received: 14 March 2018 / Revised: 3 April 2018 / Accepted: 7 April 2018 / Published: 13 April 2018
(This article belongs to the Section Energy Storage and Application)
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. View Full-Text
Keywords: MMC; unified power quality controller; voltage sag; energy storage characteristics; medium voltage distribution system MMC; unified power quality controller; voltage sag; energy storage characteristics; medium voltage distribution system
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Yang, Y.; Xiao, X.; Guo, S.; Gao, Y.; Yuan, C.; Yang, W. Energy Storage Characteristic Analysis of Voltage Sags Compensation for UPQC Based on MMC for Medium Voltage Distribution System. Energies 2018, 11, 923.

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