Inverter parallel technology

qepdcri

Inverter parallel technology [Copy link]

 

Which technology is most commonly used in the market for inverter parallel connection? Droop control, or one unit voltage output and the other current output control, or hardware synchronous phase tracking and software voltage fine-tuning?

luominxdy

Which technology is most commonly used in the market for inverter parallel connection?

okhxyyo

Inverter parallel technology is a technology that combines multiple inverters together to achieve common output, aiming to increase the power output of the system, reduce the load of a single inverter, and improve the reliability and stability of the system. Common inverter parallel technologies mainly include the following:
1. Hardware parallel
Hardware parallel refers to connecting multiple inverters in parallel and directly connecting them in parallel to the same collector line. Hardware parallel requires that the signal output of the inverter must meet the phase requirements, and the output voltage, current, frequency and other parameters of the inverter must be the same to prevent mutual interference and damage between the inverters. This parallel method is simple to implement, but requires strict matching and control at the hardware level.
2. Software parallel
Software parallel connects multiple inverters together through an integrated controller to achieve centralized control and monitoring. Software parallel connects multiple inverters through a network to achieve power control and centralized data processing. This method can more flexibly adjust the operating status of the inverter and improve the overall performance and reliability of the system.
3. Specific parallel control strategy
Centralized control parallel scheme The
centralized control parallel scheme is an earlier proposed scheme, in which the parallel control module detects the frequency and phase of the mains power and gives a synchronization signal to each inverter. When the mains power is off, the phase-locked loop circuit of each inverter ensures that the frequency and phase of the output voltage are consistent.
This scheme is simple to implement and has a good current sharing effect, but it does not achieve true redundancy. Once the parallel controller fails, the entire system may collapse and the reliability is greatly reduced.
Master-slave control parallel scheme
The master-slave control parallel scheme is derived from the centralized control parallel scheme. The master and slave modules are switched through the mode selection switch, software setting, hardware designation or working status, thereby avoiding the possibility of system collapse due to controller failure in the centralized control mode.
This scheme is simple to control and has good stability and control accuracy, but the switching between the master and slave modules may generate instantaneous circulation and requires an additional controller.
Distributed control parallel scheme
The distributed control parallel scheme (also known as the distributed logic control parallel scheme) is a true redundant control method. The addition and exit of any module will not affect the operation of the system.
This solution detects the output current and voltage of each module and makes real-time adjustments to achieve current sharing and synchronization between modules. Its advantages include consistent status between modules, real distributed redundant control, and fast dynamic response.
3C control parallel solution
The 3C control method adopts the idea of tracking, adding the output current feedback signal of the first inverter to the control loop of the second inverter, and connecting them in sequence to form a ring structure.
This solution greatly reduces the number of interconnection lines, which not only reduces interference, but also makes it easy to achieve parallel connection of multiple units. However, the design of the controller is quite complex and requires the use of advanced control theories and methods.

盛世辉煌电子科学

okhxyyo published on 2024-7-24 10:17 Inverter parallel technology is a technology that combines multiple inverters together to achieve common output, aiming to increase the power output of the system and reduce the load of a single inverter...

It does make sense to use both hard and soft tactics