Analysis and control of tundish induction heating power supply using modular multilevel converter

Yufei Yue; Qianming Xu; An Luo; Peng Guo; Zhixing He; Yan Li

Analysis and control of tundish induction heating power supply using modular multilevel converter

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Author(s): Yufei Yue¹ ; Qianming Xu¹ ; An Luo¹ ; Peng Guo¹ ; Zhixing He¹ ; Yan Li^{1, 2}
- Affiliations: 1: National Electric Power Conversion and Control Engineering Technology Research Center , Hunan University , Changsha, Hunan Province , People's Republic of China ;
  2: School of Information Science and Engineering , Central South University , Changsha, Hunan Province , People's Republic of China
Source: Volume 12, Issue 14, 14 August 2018, p. 3452 – 3460
DOI: 10.1049/iet-gtd.2017.1274 , Print ISSN 1751-8687, Online ISSN 1751-8695

Received 18/08/2017, Accepted 06/05/2018, Revised 29/03/2018, Published 15/05/2018

Modular multilevel converters (MMCs) provide advantages to reach medium-voltage operation increasing the power level in industrial applications. In this study, a tundish induction heating power supply based MMC (MMC-TIHPS) is investigated for heating molten steel. The equivalent model of MMC-TIHPS is established and the energy in horizontal and vertical directions are analysed. The heating control for molten steel consists of temperature increasing and constant temperature processes (alternatively called transient-state and steady-state operation). The main contribution of this study is to propose a direct power feedforward control based load current feedforward strategy for TIHPS. With this strategy, TIHPS can be controlled operating with full power to heat molten steel in transient state and guarantee the insulation effectiveness in steady state. Proper parameters of controllers are designed. Experimental results are conducted to validate the feasibility of MMC-TIHPS and the effectiveness of the proposed control method.

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Analysis and control of tundish induction heating power supply using modular multilevel converter

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