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| Submodule with Shoot-Through Ability for Modular Multilevel Converters Adopting Clamping and Energy Transfer Circuits |
| Xu Kunshan, Xie Shaojun |
| College of Automation Nanjing University of Aeronautics and AstronauticsNanjing 211106 China |
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Abstract To improve the reliability of the modular multilevel converters (MMC), a new submodule (SM) topology with shoot-through ability is proposed, which is composed of the clamping circuit, energy transfer circuit and half-bridge circuit. The clamping circuit ensures the stability of the SM voltage, and the energy transfer circuit guarantees the energy balance flowing into and out the SM. The new topology not only has the shoot-through ability and the self-balancing ability, but also does not require a capacitor voltage balance control strategy. It greatly improves the reliability, simplifies the system structure, and reduces the calculation. The circuit topology, operation principle and control method of the novel SM are presented. Based on a five-level single-phase MMC prototype, the feasibility of the proposed SM topology is verified. It has been demonstrated that some SMs are shoot-through and the AC circulate current is small without suppression strategy.
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Received: 20 June 2018
Published: 05 May 2019
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2019, Vol. 34 
