NDLI: Selection methods of main circuit parameters for modular multilevel converters

Content Provider	IET Digital Library
Author	Xu, Zheng Xiao, Huangqing Zhang, Zheren
Abstract	The modular multilevel converter (MMC) will be used in power systems more and more widely. The main circuit parameter design of the MMC impacts the initial investment and the operating performance of the system. In this study the parameter design problem of several important elements in the main circuit of the MMC, such as the link transformer, the arm reactor, the sub-module (SM) capacitor and the SM power electronic devices are analysed. Based on the fundamental equivalent circuit of the MMC, the design method for the rated valve side no-load voltage of the link transformer is proposed; and the variation range of the rated valve side no-load voltage is determined as (1.00–1.05)/2 times of the DC side voltage. By introducing the concept of the equivalent capacity discharging time constant H, the nearly constant relationship between the fluctuation ratio of the SM capacitor voltage and the H-value for different projects is discovered, which means the H-value is independent of particular projects. In this study, the corresponding parameters of several practical projects are analysed and the recommended H-value is given as 40 ms. The voltage and current stress of the SM power electronic devices is investigated for the four extreme operating conditions by the analytical formulae of the MMC; and it is discovered that the current stress of the SM power electronic devices changes greatly with the operating condition. By introducing the concepts of the phase unit series resonance frequency and the circulating current resonance frequency, the principle for designing the parameter of the arm inductor is established. Through analysing the corresponding parameters of several real projects, the recommended value of the phase unit series resonance frequency is given as the rated frequency of the connected AC system.
Starting Page	788
Ending Page	797
Page Count	10
ISSN	17521416
Volume Number	10
e-ISSN	17521424
Issue Number	Issue 6, Jul (2016)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-rpg/10/6
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-rpg.2015.0434
Journal	IET Renewable Power Generation
Publisher Date	2016-07-01
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	AC System Arm Inductor Arm Reactor Capacitor Circulating Current Resonance Frequency Current Stress Equivalent Capacity Discharging Time Constant Fluctuation Ratio Inductors And Transformer Link Transformer Main Circuit Parameter Design MMC Modular Multilevel Converter Phase Unit Series Resonance Frequency Power Converter Power Supplies to Apparatus SM Capacitor Voltage SM Power Electronic Device Sub-module Capacitor Time 40 Ms Transformer Voltage Stress
Content Type	Text
Resource Type	Article
Subject	Renewable Energy, Sustainability and the Environment

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

Cell capacitor sizing in multilevel converters: cases of the modular multilevel converter and alternate arm converter

Master–slave structure-based capacitor voltage measuring technique for hybrid modular multilevel converters

Modified MMC and its capacitor voltage ripple suppression method employed in medium-voltage wind generator system

Submodule power balancing control of modular multilevel converters under capacitor degradation

Modular multilevel converter composite submodule topology and control

Complete mathematical model derivation for modular multilevel converter based on successive approximation approach

Controllers for eliminating the ac components in the circulating current of modular multilevel converters

Modular multilevel converter with DHB energy-balancing channels for medium-voltage adjustable-speed drives

Submodule capacitance requirement reduction with capacitor voltage ripple suppression in MMC

Selection methods of main circuit parameters for modular multilevel converters

Similar Documents

Cell capacitor sizing in multilevel converters: cases of the modular multilevel converter and alternate arm converter

Master–slave structure-based capacitor voltage measuring technique for hybrid modular multilevel converters

Modified MMC and its capacitor voltage ripple suppression method employed in medium-voltage wind generator system

Submodule power balancing control of modular multilevel converters under capacitor degradation

Modular multilevel converter composite submodule topology and control

Complete mathematical model derivation for modular multilevel converter based on successive approximation approach

Controllers for eliminating the ac components in the circulating current of modular multilevel converters

Modular multilevel converter with DHB energy-balancing channels for medium-voltage adjustable-speed drives

Submodule capacitance requirement reduction with capacitor voltage ripple suppression in MMC

Selection methods of main circuit parameters for modular multilevel converters