Introduction to off-grid solar photovoltaic power generation systems In
recent years, with the country’s vigorous advocacy of clean energy, more and more applications of off-grid solar photovoltaic power generation systems have led to many people who did not know this system. Everyone has heard of it, but everyone’s understanding of it just stays on having heard about it, and there is no in-depth understanding. Therefore, we have prepared an introduction to off-grid solar photovoltaic power generation systems. If you are interested, let’s take a look.
1. System composition The
off-grid solar photovoltaic power generation system is mainly composed of five parts: solar panels, battery packs, solar controllers, converters and monitoring systems. Figure 1 is a schematic diagram of a photovoltaic power generation system, and Figure 2 is a block diagram of the principle of the system. The functions and functions of each part are:
1. Photovoltaic panel: It is the core of photovoltaic power generation, and its function is to directly convert solar radiation energy into DC power to supply loads or store in storage batteries.
2. Photovoltaic controller: Since the output of general monocrystalline silicon or polycrystalline silicon photovoltaic panels is a current source type, it cannot be directly output to the load and battery. It needs to be converted into a stable voltage or current acceptable to the battery by the photovoltaic controller. achieve a battery available charging or supplying external load. The photovoltaic controller can also realize the overshoot and overdischarge protection functions of the battery pack.
3. Inverter: If the output is required to be DC, the voltage of the battery can be converted into different DC voltages through this part to adapt to different load devices. If the output is AC, it can be converted into AC 220V (single-phase) or 380V (three-phase) through DC. For household use, AC inverters are generally purchased for this part.
4. Monitoring system: The main function of this part is to monitor the working parameters and working status of each part, while providing a man-machine interface.
2. System functions and features
1. It can realize the automatic management of the constant voltage and constant current charging and charging process of the battery pack;
2. It has the solar maximum power point tracking control function (MPPT), and exerts the maximum efficiency of the photovoltaic cell;
3. The inverter AC output waveform has good sine, stable output voltage and strong anti-interference ability;
4. Perfect protection function, with battery overcharge, overdischarge, output overvoltage, overcurrent, short circuit and other protections;
5. It has the backup function of AC grid power supply. When there is no sunlight for many days and the stored energy of the battery cannot meet the output power supply, the system can automatically switch to AC mains power supply. Due to the continuous switching of the DC side, the AC output is uninterrupted; 6. Friendly Human-machine operation interface, complete monitoring function, the system adopts large-size touch LCD screen, which is easy to operate and intuitive to display;
Third, the system adapts to the field
1. Home power supply: It is especially suitable for independent living families, such as urban villas and rural areas. family. For urban residential quarters, households living on the top floor or families with larger private balconies are also more suitable;
2. School power supply: especially suitable for primary and secondary schools and kindergartens. In these places, electricity is generally used during the day and the electricity consumption is low. Large;
3. Hospital power supply: it can be integrated with the hospital’s emergency power supply system, which can effectively improve the reliability and economy of the hospital’s emergency power supply;
4. Urban community public power supply: it can be installed in the public part of the urban community and connected to the community The public electricity room is used as the public electricity of the community;
5. The power supply of the office building of government departments, enterprises and institutions: Centrally installed on the top of the office building, as a public electricity access to the low-voltage power distribution cabinet of the building.
Yida Optoelectronics Co., Ltd. is mainly a national high-tech enterprise that produces photovoltaic controllers, inverters, and inverters. The company adheres to the corporate spirit of "integrity, innovation, dedication, and cooperation" to provide customers with high-quality system design, The installation, technological transformation and other solution services have continuously improved the satisfaction of customers and the public, and strived to build the company into a new energy enterprise with greater contributions to society and a global reputation.
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