Advantages and Disadvantages of Centralized Inverters

Advantages and Disadvantages of Centralized Inverters
Centralized inverter: The equipment power is between 50KW and 630KW. The power device uses high-current IGBT. The system topology uses DC-AC first-level power electronic device to convert full-bridge inverter and power frequency isolation transformer. The protection level is average. for IP20. Larger in size, vertical installation indoors.

Main advantages of central inverters
(1) The number of inverters is small and easy to manage;
(2) The inverter has a small number of components and high reliability;
(3) Low harmonic content, low DC component and high power quality;
(4) The inverter has high integration, high power density and low cost;
(5) The inverter has complete protection functions and the power station has high safety;
(6) It has power factor adjustment function and low voltage ride-through function, and has good power grid regulation.
Main disadvantages of central inverters
(1) The DC combiner box has a high failure rate, which affects the entire system.
(2) The central inverter MPPT voltage range is narrow, generally 450-820V, and the component configuration is inflexible. On rainy days and in areas with a lot of fog, the power generation time is short.
(3) The installation and deployment of the inverter computer room is difficult and requires dedicated computer rooms and equipment.
(4) The power consumption of the inverter itself and the ventilation and heat dissipation of the computer room make system maintenance relatively complex.
(5) In a centralized grid-connected inverter system, the module array reaches the inverter after two confluences. The inverter maximum power tracking function (MPPT) cannot monitor the operation of each module, so it is impossible to make each module Components are all at their optimal working point. When a component fails or is shaded, it will affect the power generation efficiency of the entire system.
(6) There is no redundancy capability in the centralized grid-connected inverter system. If a failure occurs, the entire system will stop generating electricity.