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

• Published in: IET power electronics Vol. 11; no. 14; pp. 2311 - 2318
• Main Authors: Zhu, Junjie, Sun, Xingfa, Nie, Ziling, Rui, Wanzhi, Han, Yi, Wu, Yanhao
• Format: Journal Article
• Language: English
• Published: The Institution of Engineering and Technology 27.11.2018
• Subjects: dual five‐level independent control method; dual single‐phase five‐level converters; five‐level independent control method; improved space vector pulse‐width modulation; improved SVPWM strategy; neutral point clamped five‐level converter topology; neutral‐point potential balancing algorithm; NPC five‐level converter; outpur pulse combinational‐encoding transmission; PWM power convertors; real‐time control; Research Article; space voltage vector diagram; switching convertors; switching loss reduction; switching rule analysis; synchronisation; synchronous control method; synchronous control strategy; target voltage vector synthesis method; three‐segment SVPWM; outpur pulse combinational-encoding transmission; PWM power convertors; dual single-phase five-level converters; neutral-point potential balancing algorithm; real-time control; target voltage vector synthesis method; improved SVPWM strategy; synchronous control method; space voltage vector diagram; switching rule analysis; synchronisation; switching convertors; NPC five-level converter; five-level independent control method; synchronous control strategy; switching loss reduction; improved space vector pulse-width modulation; neutral point clamped five-level converter topology; dual five-level independent control method; three-segment SVPWM
• ISSN: 1755-4535; 1755-4543; 1755-4543
• DOI: 10.1049/iet-pel.2018.5564

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.