NDLI: Improved post-fault operation strategy for a cascaded H-bridge based STATCOM

Content Provider	IET Digital Library
Author	Neyshabouri, Yousef Eini, Hossein Iman Chaudhary, Sanjay K. Jin, Yu Teodorescu, Remus
Abstract	This study presents a multi-fault tolerant strategy for a cascaded H-bridge (CHB) based static synchronous compensator (STATCOM) with star configuration. A new method for post-fault operation of CHB-STATCOM is proposed, where after switch failures, the full-bridge (FB) submodules are used as two different types of half-bridge submodules named as positive half-bridge (P-HB) and negative half-bridge (N-HB). Using a modified level shift pulse-width modulation technique, a combination of FB, P-HB and N-HB submodules is employed in three legs of the converter to generate the maximum attainable ac side voltage in post-fault condition. In order to restore the nominal capacity of CHB-STATCOM, the capacitor voltage of submodules is increased based on the type and number of switch failures. Furthermore, by utilising a voltage balancing strategy, the voltages of submodules’ capacitors are kept balanced and regulated at the desired value in post-fault condition. The feasibility and effectiveness of the proposed strategy is validated on a scaled-down 9-level CHB-STATCOM laboratory prototype.
Starting Page	2413
Ending Page	2423
Page Count	11
ISSN	17554535
Volume Number	13
e-ISSN	17554543
Issue Number	Issue 12, Sep (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-pel/13/12
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-pel.2019.1280
Journal	IET Power Electronics
Publisher Date	2020-05-13
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	9-level CHB-STATCOM Laboratory Prototype Bridge Circuit Cascaded H-bridge Based STATCOM Fault Tolerance Full-bridge Submodules Half-bridge Submodules Improved Post-fault Operation Strategy Maximum Attainable AC Side Voltage Modified Level Shift Pulse-width Modulation Technique Multifault Tolerant Strategy N-HB Submodules Negative Half-bridge Other Power Apparatus And Electric Machine Positive Half-bridge Post-fault Condition Power Converter Power Supplies to Apparatus Star Configuration Static Synchronous Compensator Static VAr Compensators Switch Failure Voltage Balancing Strategy
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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