The introduction and advantages of decentralized photovoltaic inverters
The decentralized inverter optimizes the system by using multiple MPPT (Maximum Power Point Tracking) controllers in the front-end, achieving multi-MPPT tracking functionality. After gathering the power, a centralized inverter is used for inversion.
Decentralized inverters are primarily applied in large-scale centralized ground-mounted photovoltaic power stations, such as those located in mountainous areas, deserts, or on bodies of water.
Advantages of Decentralized Photovoltaic Inverters:
Decentralized photovoltaic inverters combine the "centralized inversion" of large centralized inverters with the "distributed MPPT tracking" of string inverters, achieving the low cost and high reliability of centralized inverters, along with the higher energy yield of string inverters. The advantages are clear.
Smaller Land Area: Decentralized inverters adopt centralized inversion, significantly reducing the equipment footprint and saving land resources for the photovoltaic power station.
Reduced Line Losses: Compared to centralized and string inverters, decentralized inverters feature a boosting function, increasing the DC and AC transmission voltage. This reduces line losses during long-distance transmission.
High Flexibility: Decentralized inverters can flexibly configure the number and specifications of photovoltaic modules based on actual needs, meeting the requirements of photovoltaic power stations of varying sizes. With a single unit capacity of 1 MW, the sub-array capacity can be flexibly configured according to terrain.
Improved Power Generation Efficiency: Through distributed MPPT tracking, decentralized inverters can independently adjust the operating voltage of each string, ensuring that each module operates at its optimal point. This results in a 2%-5% increase in power generation compared to centralized systems, improving the overall efficiency of the photovoltaic power station. Additionally, distributed MPPT tracking reduces the likelihood of module mismatch, further boosting power generation.
Cost Reduction: By using centralized inversion, the DC transmission voltage is increased to 800VDC, and the AC output voltage is raised to 520VAC. This significantly reduces the cost of DC and AC cables and allows for the networking of 2 MW large-capacity sub-arrays, further lowering system costs. The flexible configuration of the inverter’s capacity ratio reduces the number of inverters needed, cutting equipment costs while also lowering installation, maintenance, and project construction costs.