Let you know how to calculate the power generation of large photovoltaic power stations

Oct. 10, 2024

1. Calculation


1. Methods specified in the specification


According to Formula 6.6.2 of "Design Specifications for Photovoltaic Power Stations" GB50797-2012:


Ep=HA×PAZ/Es×K


This calculation method is a standard algorithm and is the most comprehensive and accurate method for calculating power generation. However, to master the comprehensive efficiency coefficient, it is necessary to calculate cable loss, inverter loss, transformer loss, component loss (temperature, shielding, MPPT. For non-photovoltaic practitioners, it is difficult to calculate the tracking loss rate, etc.). The value of K is between 75% and 85%, depending on the specific project. In general engineering, the preliminary design stage can be taken as 80%; detailed calculation is required in the construction drawing stage (now generally using PVsyst simulation). 2. Radiation calculation method.


Ep=HA*S*K1*K


Where: HA---total solar irradiation on the inclined surface (KWh/㎡); S---comprehensive component area (㎡); K1-component conversion efficiency; K---system comprehensive efficiency.


This calculation method is a variation of the method, Applicable to inclined installation projects, as long as the inclined irradiation is obtained (or converted according to horizontal irradiation: inclined irradiation = horizontal irradiation / cosα), more accurate data can be calculated. The system comprehensive efficiency K also needs to consider cable loss, inverter loss, transformer loss, component loss (temperature, shielding, MPPT tracking loss rate, etc.) The general value of losses is between 75% and 85%. According to the specific project. The preliminary design stage can be taken as 80%; detailed calculation is required in the construction drawing stage (now generally using PVsyst simulation).


2. Estimation


Calculate by peak sunshine hours


Ep=H*P*K


Where: P---is the system installation capacity (KWp) H---local peak sunshine hours (h) (Note ①) (the value required by the specification has not been found yet, and it can be queried through software/online); K---system comprehensive efficiency (75%-85%, 80%)


This calculation method is also a variation of the method, which is simple and convenient, and can calculate the average daily power generation, and is often used for early project power generation estimation.

Let you know how to calculate the power generation of large photovoltaic power stations

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