Supercapacitors for power control in a grid-connected photovoltaic system

doi:10.3969/j.issn.2095-4239.2013.03.006

Abstract

Abstract: Output power of a grid-connected photovoltaic power generation system is often random and fluctuant. This is harmful to the stability of the power system,the photovoltaic power consumption and power quality,and therefore restricts the development of PV generation. To address these issues,supercapacitors were adopted as a power regulating device. This controls the grid-connected photovoltaic system to enable output power according to a preset condition in a smooth and stable manner. In this paper, an analysis is done on the supercapacitor characteristics,system structure and small-signal model of the bi-directional DC / DC converter. Based on the analysis, a strategy is put forward for power and current double closed-loop with feedback hysteresis current control. Finally, simulations are carried out in the PSCAD / EMTDC environment and the results and the results suggest the feasibility of the method.

Key words: Supercapacitor, photovoltaic grid-connected system, bi-directional DC / DC converter, feedback hysteresis current control

CLC Number:

TQ028.8

JIANG Zhe, YIN Zhongdong. Supercapacitors for power control in a grid-connected photovoltaic system[J]. Energy Storage Science and Technology, 2013, 2(3): 222-226.

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