Research on simplified SVPWM strategy for nine-switch converter
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ORIGINAL ARTICLE
Research on simplified SVPWM strategy for nine‑switch converter Jia Guo1 Received: 7 March 2020 / Revised: 10 July 2020 / Accepted: 23 July 2020 © The Korean Institute of Power Electronics 2020
Abstract Nine-switch converter has promising application prospects in fields where cost, volume and power density are required. The performance of the converter depends to a large extent on the modulation strategy. The existing SVPWM strategy for nineswitch converter requires a lengthy zero-vectors table to make over-modulation judgment, which increased the complexity of the algorithm and the runtime of the program. To improve performance, a novel simplified SVPWM strategy for nine-switch converter is proposed in this paper. The zero-vectors table is replaced by a set of simple formulas for over-modulation judgment and processing. This simplification is based on derivation of the implied reference signals of the SVPWM strategy. The correctness of the proposed algorithm is verified through simulation and experimental results. It is also demonstrated that the proposed simplified algorithm can achieve the same output results as the traditional method with less code length and runtime. Keywords Nine-switch converter · Modulation strategy · SVPWM · Minimum DC voltage
1 Introduction Power electronics technology can improve the performance of various types of electric equipment. With its continuous development, the application field of power electronic converters has been expanding. Circuit topology has an important impact on the price, volume and performance of power electronic converters. Research on circuit topologies using fewer power devices has been carried out. The B4 converter, B8 converter and five-leg converter are part of these research outcomes [1–3]. While these converters meet the requirements of using fewer power devices, they all have flaws such as large DC voltage fluctuations or a limited output voltage frequency. The nine-switch converter (NSC) is another outcome of this research [4–6]. An NSC has two sets of AC ports, and can be connected to two different three-phase threewire loads or to a grid. It has 25% fewer power devices than back-to-back converters (B2BC). Since the advent of NSCs, there have been attempts to use it in various applications where cost, size and power density are required, such as
* Jia Guo [email protected] 1
School of Electrical Engineering, Hebei University of Science and Technology, Shijiazhuang, China
motor drives, UPSs, power quality management, new energy power generation, etc.[4, 6–8]. The performance of an NSC depends to a large extent on the applied modulation strategy. SVPWM has the advantages of low output harmonics, high DC voltage utilization and easy digitalization. To improve the performance of an NSC, the authors of [9] apply SVPWM to implement the different frequency (DF) mode of the NSC. Due to the wider application of the common frequency (CF) mode, the authors of [10] extended the algorithm of [9] to make it applicable to both modes. In add
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