access icon free Synchronous control strategy of dual five-level converters based on the improved SVPWM

© The Institution of Engineering and Technology
Received 11/12/2017, Accepted 17/09/2018, Revised 20/08/2018, Published 21/09/2018

This Letter has proposed a synchronous control strategy of dual five-level converters based on the improved space vector pulse-width modulation (SVPWM). Firstly, the main topology of the neutral point clamped (NPC) five-level converter was introduced and its operational principle was analysed. Then, the space voltage vector diagram was offered. Considering the reduction of switching loss, the optimisation of the synthesis method of target voltage vectors and the addition of the neutral-point potential balancing algorithm can lead to an improved SVPWM strategy for the five-level converter. The analysis of the switching rules proves that the improved SVPWM has an advantage over the traditional three-segment SVPWM due to its fewer times of switching. On the basis of the improved SVPWM, a synchronous control method of dual single-phase five-level converters is proposed to carry out a real-time control of the dual five-level converters through the combinational-encoding transmission of output pulses. Thus, the synchronous control method can, to a great extent, solve the problems caused by the traditional dual five-level independent control method, such as high hardware cost, the complexity of control, and poor synchronous performance. Simulations and experiments show that the proposed synchronous control method is feasible and effective.

Inspec keywords: PWM power convertors; synchronisation; switching convertors

Other keywords: synchronous control method; NPC five-level converter; neutral-point potential balancing algorithm; dual single-phase five-level converters; real-time control; neutral point clamped five-level converter topology; target voltage vector synthesis method; switching loss reduction; outpur pulse combinational-encoding transmission; switching rule analysis; synchronous control strategy; improved space vector pulse-width modulation; five-level independent control method; dual five-level independent control method; space voltage vector diagram; improved SVPWM strategy; three-segment SVPWM

Subjects: Power convertors and power supplies to apparatus; Control of electric power systems

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