4-kW 3-phase rectifier with high efficiency and wide operational range via 3-mode SVPWM
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ORIGINAL ARTICLE
4‑kW 3‑phase rectifier with high efficiency and wide operational range via 3‑mode SVPWM Jiaqing Lin1 · Zhizhong Li1 · Bo Zhang2 · Guidong Zhang3 · Wei Qiu1 Received: 18 May 2020 / Revised: 10 August 2020 / Accepted: 23 August 2020 © The Korean Institute of Power Electronics 2020
Abstract There are 6 modes in the full working state of a traditional 3-phase rectifier, and each mode is necessary for power factor correcting and for realizing the corresponding DC-link voltage. It is obvious that too many modes in the full working state increase the switch stresses, which results in high switching loss and increased economic cost. Reducing the number of working modes is a feasible solution to solve this problem. By improving the m-mode controllability in inverters, a 3-mode control strategy is derived for the traditional 3-phase rectifier to enhance its operational features. Note that the proposed control strategy can maintain a high-power factor above 0.99 and have higher efficiency when compared with the traditional control strategy. Finally, a lab-prototype with a load varying from 800 W to 4 kW is conducted to validate the feasibility of the proposed control strategy. Experimental results show that all of the tested cases have a 0.99 power factor and that highest efficiency of 96.7%. The results also reveal that the proposed strategy is superior to the traditional one in laboratory conditions. In addition, the proposed method is generalized and can be extended to other rectifier topologies. Keywords 3-Phase rectifier · 3-Mode controllability · Switched linear system · SVPWM
1 Introduction The traditional 3-phase rectifier [1] has been widely applied in industrial products [2] as a based-voltage source rectifier (VSR) due to its features of high-efficiency, easy of control and freedom from the requirement of a DC-link inductor when compared with the based-current source rectifier (CSR) in [3]. As one type of modulation technology under voltageoriented control (VOC), space vector pulse width modulation (SVPWM) is commonly used to generate the driving signals in traditional 3-phase rectifiers. As shown in Fig. 1 of the traditional 3-phase rectifier and in Fig. 2 of 8 SVPWM modes, the converter normally only operates in 6 modes, while the other two transitive modes (U0, U7) * Zhizhong Li [email protected] 1
School of Information Engineering, Guangdong University of Technology, Guangzhou, China
2
School of Electric Power, South China University of Technology, Guangzhou, China
3
School of Automation, Guangdong University of Technology, Guangzhou, China
do not participate in energy conversion. However, with the expansion of the application scenario, a total of 6 working modes still possesses many deficiencies such as complex algorithms, high output ripples, and high switching losses in many industrial applications. Therefore, many researchers have been committed to making optimizations and improvements. For example, four-wire topologies were employed in [4, 5], to decrease the DC-link
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