DC-link stress analysis for the grid connection of point absorber type wave energy converters

2015 International Conference on Clean Electrical Power (ICCEP) Pub Date : 2015-06-16 DOI:10.1109/ICCEP.2015.7177601

Deepak E. Soman, J. Loncarski, M. Srndovic, M. Leijon

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引用次数: 1

Abstract

Highly random nature of input power from wave energy converters (WEC), especially from direct-driven point absorbers, demands customized power electronic converters for grid connection. In this paper, analysis and comparison of the DC-link stresses in the converter systems for two cases - a single and three collective units, of wave energy converters is given. The AC/DC/AC converter system includes a conventional uncontrolled three phase rectifier, a DC/DC converter to boost the DC-link voltage and an inverter with RL load. The system has been studied under two different controller actions for the DC/DC converter: with constant boost factor and with constant DC-link voltage. A Proportional Integral controller has been used to regulate the voltage in the latter case. Matlab/Simulink based system simulation has been done to compare the DC-link stress. The analysis shows the comparison in DC-link stresses and the requirements of the system for different cases, proving the advantages and the importance of having customized active power conversion methods for minimizing the DC-link stresses.

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点吸收式波能转换器并网直流链路应力分析

波浪能变换器(WEC)，特别是直接驱动的点吸收器的输入功率具有高度随机性，因此需要定制用于并网的电力电子变换器。本文分析比较了波能变换器在单单元和三单元两种情况下的直流链路应力。AC/DC/AC变换器系统包括一个传统的非控制三相整流器，一个DC/DC变换器来提高DC链路电压和一个带RL负载的逆变器。在恒定升压因数和恒定直流链路电压两种不同的控制器作用下，对系统进行了研究。在后一种情况下，比例积分控制器被用来调节电压。基于Matlab/Simulink进行了系统仿真，比较了直流链路的应力。分析显示了不同情况下直流链路应力和系统要求的比较，证明了定制有源功率转换方法对于最小化直流链路应力的优势和重要性。

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2015 International Conference on Clean Electrical Power (ICCEP)

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