A Suppression of Power Fluctuations by using EDLCS in Variable Speed Wind Power Generation System

N. Ushiki, K. Fujita, and T. Nakano (Japan)


EDLC, Wind Power Generation System, Power Converter


In this paper, section 2 will define the wind fluctuation which is the control object of the EDLCs and describe the method to make the data. Furthermore, the period of the wind fluctuation is defined by the idea of the wind speed spectrum. The short periodic components of them are focused and aimed to be suppressed in the current study. The model of the EDLC and values for that rated 1200F measured will be shown in Section 3. Section 4 will discuss the design of an energy storage system with many EDLCs in series regarding withstand voltage and capacity required for the wind power generator rated 3kW and it will be presented along calculation procedure. Wind power generation system causes power fluctuations at the output. Electrical Double Layer Capacitors connected in parallel with a power converter are operated as energy storage devices to suppress them in this study. Influence of the fluctuations on the utility grid connected with the wind power generator will be reduced within the allowance by installing the energy storage system. The paper determines the suitable capacity to the power rating of the generator followed by calculation procedure. Furthermore, the effectiveness of EDLCs when applied in the wind power generation system are verified by simulation in MATLAB and experimental test. Fig.1 shows an entire schematic of the proposed system. It is assumed that a wind power generator is connected to a PWM rectifier whose output terminals are linked to the grid via a PWM inverter. EDLCs array is connected to the DC link via a reversible DC-DC converter. The converter operates the EDLCs array to charge and discharge in order to smooth the DC link power. In consequence, outflows of those fluctuating power can be kept to the minimum. Said circuit performance will be described by simulation in MATLAB in section 5 and the validity of the proposed system will be checked by experimental test using 26 EDLCs in section 6.

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