Operation Analysis of a Photovoltaic-Piezoelectric Composite Independent Power Supply System

doi:10.12096/j.2096-4528.pgt.23033

Abstract

Abstract:

Objectives In order to make the small independent power supply unit provide more flexible and stable power supply, a photovoltaic-piezoelectric composite independent power supply system was designed, and its performance in actual operation was analyzed. Methods Considering the power supply scenarios such as bus stations, the output characteristics model of piezoelectric ceramics and photovoltaic cells was established, the system configuration of photovoltaic-piezoelectric outdoor independent power supply unit was designed, and the power output and system stability under typical daily, typical annual and long-term operating conditions were analyzed. For the system design with or without piezoelectric ceramics, the reliability rate of power supply, curtailment power and power generation cost of the system were analyzed. Results After adding piezoelectric ceramics, the reliability rate of the system is 99.18%, the power generation cost is 1.399 yuan/(kW⋅h), and the annual curtailment power is 161.24 kW⋅h. Compared with the system without piezoelectric ceramics, the reliability rate is increased by 0.12%, the cost is increased by 0.8%, and the curtailment power is reduced by 18.6%. Conclusions After the addition of piezoelectric ceramics, although the power generation cost of the system increases slightly, the reliability of the system power supply is improved and the curtailment power is reduced. With the reduction of the cost of piezoelectric ceramics and the development of technology, the photovoltaic-piezoelectric composite independent power supply system will have a better application prospect in special scenarios.

Key words: photovoltaic power generation, piezoelectric ceramic power generation, photovoltaic cells, independent power supply, operation analysis, economic analysis

CLC Number:

TK 019

Zirui MENG, Yawen LIU, Xing JU. Operation Analysis of a Photovoltaic-Piezoelectric Composite Independent Power Supply System[J]. Power Generation Technology, 2024, 45(4): 696-704.

Figures/Tables 10

Fig. 1 Structure diagram of photovoltaic-piezoelectric composite independent power supply system

Fig. 2 Generating conditions of piezoelectric ceramic

Tab. 1 Configuration of independent power supply system and its main cost factors

组件	参数	数量	单价/元	总价/元
光伏组件	功率210 W	1块	200	200
压电陶瓷	尺寸Φ11.7 cm	1片×4组	25.5	102
LED灯珠	功率10 W	4个	5	20
整流器	—	1个	10	10
DC/DC变换器	—	2个	10	20
蓄电池	容量160 A⋅h	1个	400	400
人工	—	—	500	500
年设备维护	—	—	200	200

Fig. 3 Comparison between theoretical results and actual irradiation calculation results

Fig. 4 Summer solstice operating

Fig. 5 Winter solstice operating

Fig. 6 Typical annual operation

Fig. 7 Long term operation

Fig. 8 Comparison of power generation before and after adding piezoelectric ceramics

Fig. 9 Comparison of system cost before and after adding piezoelectric ceramics

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