In recent years, smart home photovoltaic energy storage systems have been continuously popular. It can provide green power for the family regardless of day and night and steady stream. Through solar power generation, do not worry about high -quality ladder electricity prices, saving electricity costs, and can better protect the high -quality life of each family.
During the day, the household photovoltaic energy storage system absorbs solar power generation and automatically stored it for night loads. When it comes to accidental power outages, the system can also automatically switch the home spare power supply in time to ensure the normal operation of lighting and electrical equipment systems at all times. At the time of power consumption, the battery pack in the family energy storage system can be charged by itself to use the spare power peak or when the power is used. In addition to being used as an emergency power supply, the home energy storage system can also be balanced. Power expenditure. The smart home photovoltaic energy storage system is similar to a micro -energy storage power station, which is not affected by urban power supply pressure.
Professional question sign?
What parts of such a powerful home photovoltaic energy storage system is generally composed of and what does it mainly rely on? What are the classifications of home photovoltaic energy storage systems? How to choose the right home photovoltaic energy storage system?
CEM “Second Understand” little knowledge
L what is a home photovoltaic energy storage system
The home photovoltaic power storage system is a system that combines the solar photoelectric conversion system with the energy storage equipment, which can convert solar power generation into the stored power energy. This system allows home users to generate electricity during the day and store excess electrical energy, and use it at night or low light conditions.
l Family photovoltaic energy storage system classification
The family energy storage system is currently divided into two types, one is the grid -connected family energy storage system, and the other is the network energy storage system.
Matching family energy storage system
It consists of five most of it, including: solar battery array, grid -connected inverter, BMS management system, battery pack, communication load. The system uses photovoltaic and energy storage system mixed power supply. When the municipal electricity is normal, the photovoltaic grid system and the municipal power are powered by the load; when the municipal power is broken, the energy storage system and the photovoltaic grid -grid system are combined with power. The network energy storage system of the network is divided into three working modes. Model one: Photovoltaic provides energy storage and electricity access to the Internet; Model 2: Photovoltaic provides energy storage and some user power consumption; Model 3: Photovoltaic provides only some energy storage.
Family energy storage system
It is independent, and there is no electrical connection with the power grid. Therefore, the entire system does not need to be connected to the inverter, and the photovoltaic inverter can meet the requirements. The energy storage system of the departure home is divided into three working modes, mode 1: photovoltaic storage storage and user electricity (sunny days); Mode 2: photovoltaic and energy storage batteries provide users with electricity (cloudy days); Mode 3: Energy storage storage: Energy storage storage The battery provides users with electricity (in the evening and rainy days).
Whether it is a grid -connected home energy storage system or a network of energy storage systems from the network, the inverter is inseparable. The inverter is like the brain and heart in the system.
what is a inverter?
The inverter is a typical component in the electrical electron, which can transform DC electricity (battery, battery) into AC electricity (generally 220V50Hz sine or square wave). In popular terms, the inverter is a device that transforms DC (DC) into AC power (AC). It consists of inverter bridge, control logic and filter circuit. Common components are rectifier diode and crystal tube. Almost all household appliances and computers have rectifiers, which are installed in the power supply of the electrical appliances. DC changes communicate, called a inverter.
l Why does the inverter occupy such an important position?
AC transmission is more efficient than DC transmission, and it is widely used in power transmission. The dispersing power of the transmitted current on the wire can be obtained by P = I2R (the square × resistor of the power = current). Obviously, the energy loss needs to be reduced to reduce the transmitted current or the resistance of the wire. Due to cost and technology limited, it is difficult to reduce the transmission line (such as copper wire) resistance, so reducing the transmission current is a unique and effective method. According to P = IU (power = current × voltage, in fact, effective power p = IUCOS φ), turning DC electricity into AC power, improving the voltage of the power grid to reduce the current in the wire to achieve the purpose of saving energy.
Similarly, in the process of solar photovoltaic power generation, the power of the photovoltaic arrays is DC power, but many loads need AC power. There is a large limitations of the DC power supply system, which is not convenient to change the voltage, and the load application range is also limited. In addition to the special power load, the inverter needs to be used to convert DC electricity to AC power. Photovoltaic inverter is the heart of the solar photovoltaic power generation system. It translates the DC electricity generated by photovoltaic components into AC power, transports electronic equipment with local loads or grids, and has related protection functions. The photovoltaic inverter is mainly composed of power modules, control circuit boards, circuit breakers, filters, electrical resistors, transformers, contactors, and cabinets. As a link, its development depends on the development of power electronic technology, semiconductor device technology and modern control technology.
Classification of inverters
The inverter can be roughly divided into the following three categories:
1. grid -connected inverter
The grid -connected inverter is a special inverter. In addition to the transition of the transition of DC electricity, the AC power output can be synchronized with the frequency and phase of the municipal electricity. Therefore The inverter has the ability to synchronize interfaces with the city wire. The design of this inverter is to transmit the unused power to the power grid. It does not need to be equipped with a battery. It can be equipped with MTTP technology in its input circuit.
2. Leave the Internet inverter
The liberal inverter is usually installed on a solar cell board, a small wind wheel generator or other DC power supply, and the DC power is converted into AC power that can be used for home power supply. It can use the energy from the power grid and battery to power the power load. Because it has nothing to do with the municipal power and does not require any external power supply, it is called “departure”.
The roser inverter was originally a system that provided the power of the battery to realize the regional micro grid. In the case of current input, DC input, fast charging input, high -capacity DC output and fast AC output, the out -of -network inverter can store energy and convert it into other uses. It uses control logic to adjust the input and output situation to ensure that the best efficiency is provided from the source of solar panels or small wind wheel generators, and the energy quality is optimized by using pure sine wave output.
For the network inverter, the battery is mandatory for the solar energy system of the network, and it stores energy through the battery so that it can be used under sunset or without electricity. The backbone inverter also helps reduce dependence on traditional power grids. This dependence usually causes the problem of energy unstable problems that power outage, power outage, and power companies cannot eliminate.
In addition, the separation inverter with a solar charging controller means that there is a PWM or MPPT solar controller inside the solar inverter. Users can connect the photovoltaic input in the solar inverter and check on the display screen of the solar inverter display screen Photovoltaic state, which is convenient for system connection and inspection. The mesh inverter perform self -detection in a reserve generator and battery to ensure the complete and stable power quality. It is mainly used to provide electricity for some residential and commercial projects, and low -watt counts are used to power the family’s electrical appliances.
3. Mixed inverter
For hybrid inverters, there are usually two different meanings, one is the departure inverter of the built -in solar charging controller, and the other is a inverter that is separated from the network. It can also be used for the network photovoltaic system, and its battery can also be configured flexibly.
The main function of the inverter
1. Automatic operation and stop function
During the day, as the angle of the solar gradually increases, the strength of the solar radiation will also increase. The photovoltaic system can absorb more solar energy. Once the output power of the inverter work is reached, the inverter can automatically start automatically. run. When the power output of the photovoltaic system becomes smaller and the output of the grid/energy storage inverter is 0 or nearly 0, it will stop running and become a standby state.
2. Anti -Island Effect function
During the photovoltaic grid -connected process, the photovoltaic power generation system and the power system are connected to the grid. When the public power grid is abnormal due to abnormal power, the photovoltaic power generation system cannot stop working in time or disconnect with the power system. It is still in a state of power supply. It is called the island effect. The island effect occurs, and it is dangerous for photovoltaic systems and grids.
The grid -connected/energy storage inverter has a anti -lone island protection circuit inside, which can intelligently detect the voltage, frequency and other information of the power grid to be merged in real time. Once the public power grid is found, due to abnormalities, the inverter can be measured according to different actual measurement according to different actual measurement. The value is cut off within the corresponding time, stopped output, and reports the fault.
3. Maximum power point tracking control function
The maximum power point tracking control function is the MPPT function, which is the core key technology of the grid -connected/energy storage inverter. It refers to the ability to track the maximum output power of the component in real time.
The output power of the photovoltaic system will be affected by various factors and is in a state of change, and the best output power is kept nominal.
The MPPT function of the grid/energy storage inverter can be tracked in real time to the maximum power that the component can output each time period. Through the intelligent adjustment system working point voltage (or current), it moves closer to the peak power point, the maximum extent Improve the power generation power of photovoltaic systems, thereby ensuring that the system can continue to work and efficiently.
4. Smart group string monitoring function
On the basis of the original MPPT monitoring of the grid/energy storage inverter, the intelligent group string detection function has been implemented. Compared with MPPT monitoring, the monitoring of voltage current is accurate to each branch group strings. Users You can clearly view the real -time running data of each way.
At present, the energy storage equipment for users is mainly the BMS battery management system, and the photovoltaic grid -connected inverter and the energy storage inverter. In response to the needs of the above family energy storage equipment and combined with the safety isolation characteristics of the unit circuit of the unit of photovoltaic systems, Huashengchang launched a set of home photovoltaic energy storage systems. The inverters are mainly grid -connected inverters and hybrid inverters. kind.
The advantages of home energy storage
Class A battery, long life, super safe
Use the LIFEPO4 battery to ensure high safety,
Long service life, more than 5000+ times of use
High -precision battery pack technology, can be flexibly assembled
With landing brackets, easy to install and easy -to -modve design, easy to assemble and control temperature
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Post time: Aug-22-2023