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单相级联型多电平变换器直流纹波电压分析及抑制策略

陶海军1,2, 肖群星1, 张金生1, 郑征1,2, 杨明1,2, 黄涛3

1.河南理工大学 电气工程与自动化学院，河南 焦作  454000;2.河南省智能装备直驱技术与控制国际联合实验室，河南 焦作  454000;3.都灵理工大学 能源系，意大利 都灵  10129

摘要:级联H桥型多电平变换器采用移相变压器+整流供电时具有功率因数高、输出电压谐波含量低等优点，在大功率工业领域范围内得到了广泛应用。传统的调制算法都以假设直流母线电压恒定为前提，然而在直流侧会出现低频纹波并被调制和传输到负载，导致输出电压波形畸变。目的 为了探讨级联H桥单元供电侧存在大量直流纹波电压导致输出负载电压波形畸变的问题，方法 本文首先采用双重傅里叶理论分析直流纹波电压，在此基础上引入一种直流纹波前馈补偿策略，通过测量每个级联H桥的直流侧实际输入电压除以电压基准值并与传统载波信号相乘，进而与调制电压进行载波移相调制；同时采用矢量控制，通过FFT变换虚拟出无功电压，以获得更快的收敛速度、更高的稳定性和更小的振荡。结果 仿真和实验结果表明，所提调制算法和控制策略可有效抑制负载电压中的低次谐波，减小输出电压波形畸变，实现逆变电源的快速动态响应和无稳态误差控制。结论 实验结果验证了本文所采用的调制策略和控制策略的可行性与合理性。

关键词:级联H桥;直流纹波;前馈补偿;载波移相调制;矢量控制

doi:doi：10.16186/j.cnki.1673-9787.2022010084

基金项目:国家自然科学基金资助项目（U1804143）；河南省科技攻关计划项目（222102220014）；河南省高校基本科研业务费专项资金资助项目（NSFRF210409）

收稿日期:2022/01/28

修回日期:2022/05/22

出版日期:2024/01/25

Analysis and suppression strategy of DC ripple voltage of single-phase cascaded multilevel converter

TAO Haijun1,2, XIAO Qunxing1, ZHANG Jinsheng1, ZHENG Zheng1,2, YANG Ming1,2, HUANG Tao3

1.School of Electrical Engineering and Automation，Henan Polytechnic University，Jiaozuo  454000，Henan，China;2.Henan International Joint Laboratory of Direct Drive and Control of Intelligent Equipment，Jiaozuo  454000，Henan，China;3.Department of Energy，Turin Institute of Technology，Turin  10129，Italy

Abstract:Cascaded H bridge type multilevel converter using phase shift transformer and rectifier power supply with the advantages of high power factor，low harmonic content of output voltage has been widely used in high-power industrial fields.The traditional modulation algorithms are based on the assumption that the DC bus voltage is a constant value.However，the low-frequency ripples appeared on the DC side are modulated and transmitted to the load，resulting in the distortion of the output voltage waveform. Objective To explore the problem that a large amount of DC ripple voltage exists on the power supply side of cascade H-bridge unit，resulting in waveform distortion of output load voltage， Methods the DC ripple voltage was firstly analyzed by using the double Fourier theory in this paper，and then a DC ripple feedforward compensation strategy was introduced.By measuring the actual input voltage of the DC side of each cascaded H-bridge divided by the voltage reference value and multiplied by the traditional carrier signal，the carrier phase shift modulation was carried out with the modulation voltage.At the same time，the reactive voltage was simulated by FFT transformation with vector control，and faster convergence speed，higher stability and smaller oscillation were obtained. Results The simulation and experimental results verified that the proposed modulation algorithm and control strategy could effectively suppress the low-order harmonics in the load voltage，reduce the waveform distortion of the output voltage，and realize the fast dynamic response and no steady-state error control of the inverter power supply. Conclusion The experimental results verified the feasibility and rationality of the modulation strategy and control strategy used above.

Key words:cascaded H-bridge;DC ripple;feedforward compensation;carrier phase-shift modulation;vector control