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浙江大学学报(工学版)
JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE)  2017, Vol. 51 Issue (10): 1974-1980    DOI: 10.3785/j.issn.1008-973X.2017.10.011
Mechanical and Energy Engineering     
Power control and grid-connected operation for tidal current energy conversion system
GU Ya-jing, LI Wei, LIU Hong-wei, LIN Yong-gang, GU Hai-gang
State Key Laboratory of Fluid Power and Mechatronic Systems, Zhejiang University, Hangzhou 310027, China
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Abstract  

A special tidal current energy conversion system was taken as an object to analyze the power control characteristic and grid-connected operation property. The mechanical structure was pitching rotor-single stage drive-permanent magnet synchronous generator. The electrical structure was rectifier-chopper-inverter. The model of drive chain from rotor to generator was constructed. A generator speed control strategy based on tidal current velocity preview was proposed considering the undetectable tidal current velocity at rotor. A pitch control based on power feedback was proposed to solve the existing problems of nonlinearity and huge calculation in direct angle feedback pitch control. The grid-connected operation property was analyzed by combining DC bus voltage control and active-reactive current decoupling. The situ experimental results show that the grid-connected system has a good operation property and a high quality of output power. Both the speed control strategy to capture maximum power under the rated tidal current velocity and the pitch control strategy to limit output power above the rated tidal current velocity were verified.

Received: 02 August 2016      Published: 27 September 2017
CLC:  TK73  
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GU Ya-jing, LI Wei, LIU Hong-wei, LIN Yong-gang, GU Hai-gang. Power control and grid-connected operation for tidal current energy conversion system. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 2017, 51(10): 1974-1980.

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http://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2017.10.011     OR     http://www.zjujournals.com/eng/Y2017/V51/I10/1974


潮流发电系统功率控制及并网运行

为了研究潮流发电系统运行过程中的功率与并网特性，以可变桨叶轮-单级增速-永磁同步发电机为机械传动结构和二极管整流-斩波-逆变为电气变换结构的潮流发电系统为对象，建立从叶轮到发电机的数学模型.针对叶轮处流速精确测量的困难性，提出基于流速预测的发电机转速控制.针对直接桨距角控制中存在的非线性、计算量庞大的问题，给出基于功率反馈的变桨距控制.采用直流母线电压控制与有功无功电流解耦相结合的方式研究并网运行特性.设计加工试验样机，开展海试试验.结果表明，并网系统具有良好的并网控制特性和较高的输出电能质量，利用提出的功率控制策略能够有效地实现最大功率捕获与超流速下的功率限定输出.

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