[Oral Presentation]Power Balance Strategy of Diode Clamped H-Bridge Cascade Multilevel Inverter

Power Balance Strategy of Diode Clamped H-Bridge Cascade Multilevel Inverter

ID：10 Submission ID：1699 View Protection：ATTENDEE Updated Time：2020-10-15 14:06:55 Hits：285 Oral Presentation

Start Time：2020-11-02 11:30 （Asia/Shanghai）

Duration：15min

Session：[B] Power Electronics Technology and Application » [B2] Session 13 and Session 18

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Abstract

Abstract -- In the cascaded neutral point clamped (NPC) H-bridge multilevel inverter system, power balance between modules has attracted more and more attention. This paper proposes a hybrid modulation strategy based on analyzing the quantitative relationship between output power and RMS of the output voltage of the module under conventional carrier level-shifted PWM modulation strategy. The strategy combines the carrier disposition modulation strategy and phase shift modulation strategy, which not only guarantees the balance of output power of each module, but also improves the equivalent switching frequency of output voltage, as a result, both the size and the cost of the output filter are reduced. The simulation waveforms and comparative analysis under different modulation strategies and modulation indexes are given. Finally, a 1kW experimental prototype is built, and the experimental results verifies that the proposed modulation strategy can

effectively solve the power balance problem between different modules in cascade system.

Keywords

Cascade multilevel inverter,Power balance

Speaker

Zhongwei Chen

Hunan Key Laboratory of Energy Internet Supply-demand and Operation；the State Grid Hunan Electric Power Company Limited Economic & Technical Research Institute

Yang Leng

the State Grid Hunan Electric Power Company Limited Economic & Technical Research Institute

Zhongwei Chen

State Grid Hunan Electric Power Company Limited Economic & Technical Research Institute

Submission Author

Zhongwei Chen Hunan Key Laboratory of Energy Internet Supply-demand and Operation；the State Grid Hunan Electric Power Company Limited Economic & Technical Research Institute

Yang Leng the State Grid Hunan Electric Power Company Limited Economic & Technical Research Institute

Yun Zhang State Grid Hunan Electric Power Company Limted

Haotian Liu State Grid Hunan Electric Power Company Limited Economic & Technical Research Institute

Yefan Wu State Grid Hunan Electric Power Company Limited Economic & Technical Research Institute

Yichao Wang State Grid Hunan Electric Power Company Limited Economic & Technical Research Institute

Pancheng Qiu State Grid Heshan Electric Power Supply Branch,Yiyang

Zhongwei Chen State Grid Hunan Electric Power Company Limited Economic & Technical Research Institute