Ni-MH 전지를 이용한 독립형 태양광발전시스템

Abstract

Photovoltaics is clean energy which is unlimited energy, no air pollution, no noise, no vibration, unlike existing to use the fossil energy fire power development method. The stand-alone PV system apply to the satellite and the palisade. But recently PV is adapted education, streetlight, pump and toy to educate. The stand-alone PV system need energy store equipment like battery when PV is impossible development like night and raining day. The stand-alone PV system has been used to lead battery and Ni-Cd battery. But a lead battery is heavy because of a low energy density and weak the durability at over charge/discharge of high current. And a using temperature band is 0∼30℃ required comparison temperature unit facilities. A remains heavy metal's lead is a main bow material and continuous discharge of the sulfuration gas injurious with a power supply equipment corrosion of the circumstance at the human body activity and battery life is short. So, USA and Japan has been studied the secondary battery instead of existing battery from 1980s, Ni-MH battery is representative secondary battery. Ni-MH battery is changed by metal hydride from Cd electrode in Ni-Cd battery. Ni-MH battery did't use harmful material and show 1.2V∼1.3V discharge. So Ni-MH battery has have no memory effect, 1.5∼2 times of the capacity compare with Ni-Cd and compatible with Ni-Cd battery. This paper try to present safety and reliability of the stand-alone system adapted of Ni-MH battery. And then this paper study charge/discharge characteristic and make charge/discharge controller to have temperature compensation facility using by microprocessor. So, this paper propose a tech to do upgrade system efficiency, safety and reliability of the stand-alone PV system.