Development of a Hybrid Power Generation System Using Photovoltaic Cells and Piezoelectric Materials

태양 전지와 압전 재료를 이용한 하이브리드 발전시스템 개발

Abstract

This paper deals with the operation of a hybrid power generation system made with photovoltaic cells and piezoelectric materials. The system can produce power from the wind as well as from the sun subject to their availability. Irrespective of the largeness of their power production, the power developed by both generators (i.e., phtovoltaic cells and piezoelectric cells) were combined and stored before it was applied to a load. Especially, the AC power (current) developed from each piezoelectric generator was converted by a full wave bridge rectifier and then combined prior to its storage in a capacitor. It was observed that the system can produce a maximum output power of 6.49 mW at loading resistance of $100{\Omega}$.

Fig. 1 Structure of a Piezo film⁷⁾

Fig. 2 Photovoltaic cell (a) and piezo film (b) attached on the front and back side of a leaf, respectively

Fig. 3 Prototype hybrid generator¹⁾

Fig. 4 Circuit for the integration of power out of the system

Fig. 5 Output wave patterns of a single piezo film - AC

Fig. 6 Output wave patterns of a single piezo film - DC

Fig. 7 Combined output wave patterns of a piezo film - V_oc

Fig. 8 Combined output wave patterns of a piezo film - I_sc

Fig. 9 Output wave patterns of the hybrid system - V_oc

Fig. 10 Output wave patterns of the hybrid system - I_sc

Table 1 Specification of the Piezo film