Function and practice of photovoltaic building energy storage system with low-voltage DC power supply

doi:10.19799/j.cnki.2095-4239.2020.0378

Abstract

Abstract:

Under the trends of energy transformation, energy conservation, and emission reduction, photovoltaic buildings combined with DC power supply have become a research hotspot, and the role of energy storage is crucial. However, the standards of electrochemical energy storage are still insufficient domestically, and the standards of building electrochemical energy storage applications are even lower. This paper analyzes the functions of energy storage in photovoltaic DC power supply buildings: coordinating control of charging and discharging power and energy of energy storage, realizing the maximum utilization of photovoltaic power generation and self-consumption, smoothing the fluctuation of photovoltaic power generation and load, improving the efficiency of building power distribution access to the grid, and ensuring the power supply of important loads. We propose the principles of reliability, economy, and adaptability of electrochemical energy storage used in photovoltaic buildings. These principles also provide references for the research and development of photovoltaic building energy storage technology standards. Under the current technical conditions, the main bases for using Pb-C batteries for photovoltaic building energy storage are safety and adaptability under partially charged states. According to the above energy storage principles, this low-voltage DC power supply photovoltaic building project is equipped with a containerized Pb-C battery energy storage system, including a 178 kW·h Pb-C battery and thermal and battery management systems. The installed capacity of the project is 112.6 kWp, which adopts a DC power supply system. The energy management system can be operated both in-grid and off-grid. The energy time-shift of the photovoltaic building for a whole day was analyzed in detail using data on in-grid operation on a certain day. The maximum utilization of photovoltaic power, peak cutting, and valley-filling and a constant power supply were demonstrated. The project can provide a reference for promoting distributed energy storage in photovoltaic buildings.

Key words: photovoltaic building, low voltage DC power supply, energy storage system, energy management system, grid friendly building

CLC Number:

TM 615

Jianjun FANG. Function and practice of photovoltaic building energy storage system with low-voltage DC power supply[J]. Energy Storage Science and Technology, 2021, 10(2): 624-629.

Figures/Tables 5

References 15

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