Optimal Decoupled Discontinuous Modulation for StatComs Based on the Cascaded H-Bridge Converter
- Resource Type
- Periodical
- Authors
- Liu, Q.; Rodriguez, E.; Farivar, G.G.; Townsend, C.D.; Pou, J.; Leyva, R.
- Source
- IEEE Transactions on Industrial Electronics IEEE Trans. Ind. Electron. Industrial Electronics, IEEE Transactions on. 71(2):1801-1810 Feb, 2024
- Subject
- Power, Energy and Industry Applications
Signal Processing and Analysis
Communication, Networking and Broadcast Technologies
Automatic voltage control
Capacitors
Legged locomotion
Control systems
Switching loss
Optimization
Clamps
Cascaded H-Bridge (CHB)
discontinuous pulsewidth modulation (DPWM)
static compensator (StatCom)
finite-set optimization
- Language
- ISSN
- 0278-0046
1557-9948
Conventional discontinuous pulsewidth modulation (DPWM) strategies for cascaded H-bridge static compensators suffer from poor inter-phase capacitor voltage balance control during unbalanced grid voltage conditions. Specifically, the logic-based algorithm that calculates the zero-sequence voltage (ZSV) for discontinuous operation interacts with the closed-loop capacitor voltage control. This article proposes an optimal DPWM strategy based on a finite-set optimization that chooses the best ZSV candidate that minimizes the control interactions while clamping a converter voltage. Furthermore, the effect of the different ZSV candidates on the switching loss is also considered within the optimization. Extensive experimental study is provided to demonstrate the effectiveness of the proposed approach.