单相级联H桥逆变电源及其矢量控制*

doi:10.11985/2023.03.021

摘要/Abstract

摘要：

级联H桥逆变电源具有输入均压、输出谐波含量低等优点，在大功率范围内得到了广泛应用。首先对单相级联H桥载波移幅调制输出电压进行谐波产生的机理分析，采用一种改进的三角载波与调制波进行载波移幅调制，减小载波谐波以及边带谐波含量。针对传统控制方法对非线性负载输出电压具有较高的THD和较大的稳态误差，通过FFT变换虚拟出无功电压，设计了矢量控制器并对其进行简化，省略了电压环q轴控制器的设计，获得了更快的收敛速度、更高的稳定性和更小的振荡。仿真和试验结果验证了所提调制算法和控制策略具有更强的抗扰动性能，可以适应不同类型的负载变化和直流电压侧的电压波动，实现了逆变电源的快速动态响应和无稳态误差控制。

关键词: 级联H桥, 矢量控制, 逆变电源, 载波移幅调制, SPWM

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

中图分类号:

TM464

陶海军, 肖群星, 张金生. 单相级联H桥逆变电源及其矢量控制^*[J]. 电气工程学报, 2023, 18(3): 196-205.

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.

图/表 18

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表1

图16

表2

输出电压谐波含量对比表"

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

表2

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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