Research on the Control and Modulation Scheme for a Novel Five-Switch Current Source Inverter

Tao Fu, Jihao Gao (), Haiyan Liu and Bo Xia ()
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Tao Fu: College of Electronic Engineering, Zhengzhou Railway Vocational & Technical College, Zhengzhou 451460, China
Jihao Gao: College of Electronic Engineering, Zhengzhou Railway Vocational & Technical College, Zhengzhou 451460, China
Haiyan Liu: College of Electronic Engineering, Zhengzhou Railway Vocational & Technical College, Zhengzhou 451460, China
Bo Xia: College of Electrical and Information Engineering, Hunan University, Changsha 410082, China

Energies, 2024, vol. 17, issue 15, 1-16

Abstract: Different from the voltage source inverter (VSI), the current source inverter (CSI) can boost the voltage and eliminate the additional passive filter and dead time. However, the DC-side inductor current is not a real current source and is generated by a DC voltage supply and an inductor. Under different switching states, the DC-side inductor will be charged or discharged, which leads to the DC-side inductor current being discontinuous or increasing. To solve the control problem of the DC-side inductor current of the CSI, a novel single-phase CSI topology with five switching tubes for grid-connected applications is proposed. Firstly, the reference calculation method and the hysteresis loop control scheme for the DC-side inductor current are proposed, and the adjustable and constant DC-side inductor current are obtained. Since the PWM signals cannot be directly implemented to the switching tubes, the modulation strategy for the single-phase CSI is proposed in this paper. Then, an active damping method based on the feedback capacitor voltage is presented to suppress the resonance peak caused by the LC filter on the grid side. Finally, the math model of the AC-side structure is established, and the optimal proportional-resonant controller parameters’ design method is explored by the amplitude–frequency characteristic curves. The simulation and experiment are implemented for the proposed CSI topology. The results show that a high-quality power with a good control performance can be obtained with the proposed CSI topology.

Keywords: current source inverter (CSI); DC-side inductor current; modulation method; active damping; proportional resonance control (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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