1. What is a parallel inverter
Parallel inverter is all about connecting multiple inverters together in parallel mode. The main objective is to increase the total power output and reliability of the system.
2. The main role of the inverter in parallel with the machine
● Increase output power
By connecting multiple inverters together and running in parallel, the output power can be effectively increased. This is particularly important for large photovoltaic power stations or distributed pv system for industrial use.
Through the parallel inverter, the output power of multiple inverters can be superimposed to meet the power demand.
● Improve system reliability
Parallel inverter can improve the reliability of the entire power system. When one of the inverters fails or needs maintenance, the other inverters can still work normally, ensuring the continuous power supply of the system. This redundant design can reduce system downtime and improve system reliability and stability.
● Realize monitoring and management
Parallel inverter can centrally manage and monitor multiple inverters. Through the parallel inverter system, key parameters such as the running state, efficiency and power generation of multiple inverters can be monitored in real time.
This monitoring and management function helps to discover and solve problems in a timely manner, and improves the maintenance efficiency and operation effect of the system.
● Reduce system costs
Parallel inverter can reduce the cost of the system. Compared to the use of multiple inverters alone, parallel inverter can reduce the number of equipment and installation complexity of the power system, thereby reducing the cost and footprint of the system.
3. What is the difference between series inverter and parallel inverter
Parallel inverter can be divided into series parallel and parallel parallel two ways.
- Series parallel
Multiple inverters are connected together in series and loaded together. In series parallel, the DC output voltage of each inverter will pass through other inverters in turn, and finally output to the load.
Series parallel can increase the direct current voltage of the system, which is suitable for application scenarios requiring higher direct current voltage.
- Parallel operation
Multiple inverters are connected together in parallel and jointly loaded. Each inverter independently converts direct current to alternating current and outputs it to the load.
Parallel inverter operation can increase the total power output of the system and is suitable for application scenarios requiring higher power output.
Both series and parallel inverter need to ensure matching and compatibility between inverters to ensure that they can work together. In addition, proper system design and configuration is required to ensure stable system operation and maximize power generation.
The parallel inverter mode needs to be selected according to the specific application requirements and system requirements to achieve the best power output effect.
4. What is the difference between parallel inverter and grid-connected inverter
Parallel inverter and inverter grid connected are two concepts.
Parallel inverter refers to a system that connects multiple inverters together to run in parallel. The main purpose is to improve the power output of the system, provide backup and redundancy, and enhance the reliability and flexibility of the system.
Inverter grid connection refers to the output of alternating current generated by solar power generation system or other renewable energy power generation system to the national grid.
Both grid-connected inverters and parallel inverters are related to the use of inverters, but their functions and application scenarios are different.
Parallel inverter is the operation of multiple inverters connected together in parallel to improve power output, provide backup and redundancy, and enhance system reliability and flexibility.
The grid-connected inverter is mainly used to convert the direct current of the solar power generation system into alternating current and inject it into the grid. Check 1000 watt power inverter.
5. What are the requirements for parallel inverters
- The inverter type and rated power are the same.
- The inverter output voltage, frequency and phase are the same.
- The inverter(3000 watt solar inverter) has the same current limit and power limit.
● Synchronous control
The key to achieving parallel operation of the inverter is synchronous control. Through synchronous control, the current and voltage can be closed loop control between the inverter output, so as to ensure the stability and reliability of parallel inverter.
● Power grid adaptability
The inverters involved in parallel inverter operation should have good power grid adaptability, and can work stably under conditions such as power grid voltage fluctuations and load changes to ensure the output quality and efficiency of the parallel system.
● Protection function
In order to ensure the safety of parallel inverter opration, each inverter should have perfect protection function, such as overvoltage protection, overcurrent protection, short circuit protection, etc., to prevent equipment damage and personal injury caused by failure or other reasons.
● Communication protocol
Another key factor to achieve operation of parallel inverter is a unified communication protocol. Through the communication protocol, information exchange and cooperative control can be realized between the inverters to ensure the high efficiency and stability operation of parallel inverter.
● Electrical isolation
During the operation of parallel inverter, attention should be paid to electrical isolation to prevent interference and fault spread between the inverters. Isolation components such as optocouplings and transformers are usually used to achieve electrical isolation.
6. Tips of inverter in the selection and use
- The DC voltage must be matched
Each parallel inverter has a nominal voltage, such as 12V, 24V, etc. The battery voltage must be consistent with the inverter's nominal DC input voltage. For example, a 12V battery must be selected for the 12V inverter.
- The output power of the inverter must be greater than the maximum power of the electrical appliance
In particular, some equipment with large starting energy requirements, such as motors, air conditioners, etc., need to leave additional power margins.
- The positive and negative terminals must be connected correctly
The DC voltage connected to the inverter is marked with positive and negative electrodes. Under normal circumstances, red is positive (+), black is negative (-), the battery is also marked with positive and negative, red is positive (+), black is negative (-), must be connected to positive (red to red), negative to negative (black to black).
The diameter of the connecting wire must be sufficiently thick, and the length of the connecting wire should be reduced as much as possible.
- The charging process and the inverter process cannot be carried out at the same time to avoid damaging the equipment and causing failure.
- The inverter shell should be properly grounded to avoid personal injury due to leakage.
- In order to avoid electric shock injury, it is strictly prohibited for non-professional personnel to disassemble, repair and modify the inverter.
7. ConclusionParallel inverters can improve the output power and reliability of the solar power generation system, realize centralized monitoring and management of multiple inverters, and reduce the cost of the system. This makes the parallel inverter widely used in large photovoltaic power station and solar energy systems for industrial use.