一种基于储能回路的小型并网风力发电系统

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Abstract A small-scale grid-connected wind generation system is proposed in this paper,in which the system topology is mainly analyzed in detail.The system adopts the switched-capacitor based single-stage three-phase flyback AC-DC converter and introduces a storage branch at the DC-link.Owing to the high voltage gain and zero current turn-on soft-switching characteristics of the rectifier,the weak wind power can be stored in the storage device with improved efficiency at low wind speed;with adequate wind power,the storage branch helps the system to conduct grid-connected generation,so that the input power can be sent directly to the grid and the promoted overall system efficiency is guaranteed.Furtherly,the topology and parameter design of the rectifier are also discussed for the purpose of voltage gain enhancement and distortions restraint.The control strategy is also briefly presented in this paper,which adjusts the control method according to different battery state-of-charge ranges and wind speeds.At last,based on the prototype,experimental waveforms and operation data in both of the laboratory and the real scenario are given.The results verify the feasibility of the theoretical analyses and prove that the proposed system shows high suitability to the small-scale wind field.

Key words： Small-scale wind generation high voltage gain storage device state-of-charge bidirectional DC-DC converter

Received: 19 August 2016 Published: 23 March 2017

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TM614

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	Yang Liang
	Wang Yifeng
	Meng Zhun

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Yang Liang,Wang Yifeng,Meng Zhun. A Small-Scale Grid-Connected Wind Generation SystemBased on a Storage Branch[J]. Transactions of China Electrotechnical Society, 2016, 31(增刊2): 120-130.

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https://dgjsxb.ces-transaction.com/EN/ OR https://dgjsxb.ces-transaction.com/EN/Y2016/V31/I增刊2/120

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