NDLI: Static voltage balance method of CDSM-MMC based on power supply control

Content Provider	IET Digital Library
Author	Yang, Lixia Jia, Lixin Luo, Longfei Zhang, Yanbin Si, Gangquan Zhang, Zhuxiang
Abstract	Recently, the clamp double sub-module (CDSM) topology with its DC fault clearance ability has become more attractive for use in the modular multilevel converter (MMC)-based high-voltage DC transmission systems. However, the capacitor voltage imbalance caused by the discreteness of the device parameters during the uncontrolled pre-charging process seriously affects the system's safe start-up. To solve this problem, this study provides a novel CDSM-MMC capacitor static voltage balance method. Since the power supplies obtaining energy from the CDSM capacitors greatly influence the static voltage balance, the power supply input current is chosen as the control variable. On the basis of the control signals generated by the voltage balance algorithm, the control of the CDSM power supply input currents makes the arm energy be an average distribution in the CDSM capacitors. This method can replace the capacitor equalising resistors of CDSM to achieve capacitor voltage balance and can reduce the CDSM-MMC's losses. The method requires no additional circuits, and the control strategy is simple. Moreover, the method can apply to the static voltage balance control of other SM topologies with two capacitors. An arm cascaded with two CDSMs is tested and the results show the effectiveness of the proposed method.
Starting Page	286
Ending Page	294
Page Count	9
ISSN	17554535
Volume Number	13
e-ISSN	17554543
Issue Number	Issue 2, Feb (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-pel/13/2
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-pel.2019.0418
Journal	IET Power Electronics
Publisher Date	2019-10-23
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Capacitor Capacitor Voltage Balance Capacitor Voltage Imbalance CDSM Capacitor CDSM Power Supply Input Currents CDSM-MMC's Loss Clamp Double Sub-modular Control of Electric Power System Control Signal Control Strategy D.C. Transmission DC Fault Clearance Ability Fault Diagnosis HVDC Power Converter HVDC Power Transmission Modular Multilevel Converter-based High-voltage DC Transmission System Novel CDSM-MMC Capacitor Static Voltage Balance Method Power Converter Power Supplies Power Supplies to Apparatus Power Supply Control Power Supply Input Current Power System Control Power Transmission Control Resistor Static Voltage Balance Control System Uncontrolled Pre-charging Process Voltage Balance Algorithm Voltage Control
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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