Minimum Voltage Operation of Cascaded H-Bridge StatComs Using Discontinuous Modulation

Operating cascaded H-bridge (CHB) static compensators (StatCom) at low dc capacitor voltages reduces voltage stress on submodule capacitors and switching semiconductors, resulting in enhanced system reliability and reduced power loss. Understanding the minimum allowable value for peak capacitor volt...

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Veröffentlicht in:IEEE transactions on power electronics 2024-05, Vol.39 (5), p.5014-5019
Hauptverfasser: Liu, Qingxiang, Rodriguez, Ezequiel, Zeng, Yu, Farivar, Glen G., Townsend, Christopher D., Pou, Josep
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container_end_page 5019
container_issue 5
container_start_page 5014
container_title IEEE transactions on power electronics
container_volume 39
creator Liu, Qingxiang
Rodriguez, Ezequiel
Zeng, Yu
Farivar, Glen G.
Townsend, Christopher D.
Pou, Josep
description Operating cascaded H-bridge (CHB) static compensators (StatCom) at low dc capacitor voltages reduces voltage stress on submodule capacitors and switching semiconductors, resulting in enhanced system reliability and reduced power loss. Understanding the minimum allowable value for peak capacitor voltage is crucial for the optimal capacitor voltage operation of CHB StatComs. This letter proposes an offset-free discontinuous pulsewidth modulation (DPWM) strategy for CHB StatComs. Unlike conventional DPWM strategies, the proposed offset-free DPWM allows the CHB StatCom to operate with minimum peak capacitor voltage. This results in reduced switching loss and lower voltage stress across submodule components. In contrast to existing third-harmonic zero-sequence voltage strategies, the proposed offset-free DPWM does not require accurate capacitance knowledge and is effective in unbalanced grid conditions and low-capacitance applications. The feasibility and effectiveness of the proposed offset-free DPWM are experimentally validated under both balanced and unbalanced grid conditions.
doi_str_mv 10.1109/TPEL.2024.3363010
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subjects Automatic voltage control
Capacitance
Capacitors
Cascaded H-Bridge (CHB)
Compensators
discontinuous pulsewidth modulation (DPWM)
Electric potential
Electric power loss
Legged locomotion
Modulation
Pulse duration
static compensator (StatCom)
Static synchronous compensators
Steady-state
Switching
Switching loss
System reliability
Unbalance
Voltage
title Minimum Voltage Operation of Cascaded H-Bridge StatComs Using Discontinuous Modulation
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