基于转速控制的双馈风电机组机侧变流器IGBT器件结温波动抑制策略

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Abstract As with the rotor side converter of doubly fed induction generator (DFIG), considering the problem of large junction temperature fluctuation of IGBT may greatly reduce its reliability under synchronous operation. A control strategy based on the rotor speed control of DFIG was proposed to depress the insulated gate bipolar transistor (IGBT) junction temperature fluctuation. First, a junction temperature calculation model of wind power converter was established, based on the principle of maximum power point tracking (MPPT) control strategy, and combined the DFIG simulation model with the equivalent thermal network of IGBT module. Then, an improved MPPT control strategy with a new power-speed outer control loop of doubly fed induction generator was proposed to solve the problem of large junction temperature fluctuation under synchronous operation condition. Herein, the idea of reducing low frequency operation range of rotor side converter and improving the variation gradient of speed at the operation range near synchronous speed was adopted. Finally, simulation models of a doubly fed wind power generation system were established by combining PLECS and Simulink platform. The electric and thermal performance of rotor side converter were performed under different speed variations between sub-synchronous speed and super-synchronous speed of DFIG. The steady state junction temperature was further analyzed around synchronous speed operation state. Furthermore, an equivalent experiment was established to testify the validity of the junction temperature depression. Simulation and experimental results show that the proposed control strategy can effectively depress the IGBT junction temperature fluctuation of the rotor side converter under synchronous operation condition of DFIG.

Key words： Doubly fed wind power generation wind power converter speed control synchronous operation speed junction temperature of IGBT

Received: 10 September 2015 Published: 30 June 2017

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	Li Hui
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	Liao Xinglin
	Hu Yaogang
	Zeng Zheng

Cite this article:

Li Hui,Li Yang,Liao Xinglin等. Insulated Gate Bipolar Transistor Junction Temperature Fluctuation Depression Strategy of Doubly Fed Wind Power Converter Based on Rotor Speed Control[J]. Transactions of China Electrotechnical Society, 2017, 32(12): 97-107.

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https://dgjsxb.ces-transaction.com/EN/ OR https://dgjsxb.ces-transaction.com/EN/Y2017/V32/I12/97

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