Single Phase Cascaded H-bridge Inverter and Its Vector Control

doi:10.11985/2023.03.021

Abstract

Abstract:

The cascaded H-bridge inverter power supply has the advantages of input voltage equalization and low output harmonic content, and has been widely used in the high power range. Firstly, the harmonic generation mechanism of the output voltage of single-phase cascaded H-bridge carrier amplitude-shift modulation is analyzed, and an improved triangular carrier and modulating wave are adopted for carrier amplitude-shift modulation to reduce the content of carrier harmonics and sideband harmonics. In view of the high THD and large steady-state error of the nonlinear load output voltage of the traditional control method, the reactive voltage is virtualized by FFT transformation, and the vector controller is designed and simplified, and the voltage loop q-axis control is omitted. The design of the controller achieves faster convergence speed, higher stability and less oscillation. Simulation and experimental results verify that the proposed modulation algorithm and control strategy have stronger anti-disturbance performance, can adapt to different types of load changes and voltage fluctuations on the DC voltage side, and achieve fast dynamic response and no steady-state error of the inverter power supply control.

Key words: Cascaded H-bridge, vector control, inverter power supply, PD-PWM, SPWM

CLC Number:

TM464

TAO Haijun, XIAO Qunxing, ZHANG Jinsheng. Single Phase Cascaded H-bridge Inverter and Its Vector Control[J]. Journal of Electrical Engineering, 2023, 18(3): 196-205.

Figures/Tables 18

输出电压 $ν i n v$	传统载波	改进载波
基波电压峰值ν_p/V	999.2	1 006
2次基波含量(%)	0.47	0.1
3次基波含量(%)	0.06	0.81
4次基波含量(%)	1.13	0.61
1 kHz载波谐波(%)	6.82	2.48
1.05 kHz载波边带谐波(%)	1.51	1.12
1.1 kHz载波边带谐波(%)	0.5	0.22

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参数	数值
级联H桥直流侧电压/V	200
输出交流电压峰值v/V	900
输出交流电压频率f/Hz	50
交流滤波电感L/mH	1.06
交流滤波电容C/μF	2.65
负载电阻R_L/Ω 开关频率f/kHz	20 60