The system efficiency of photovoltaic power plants is poorly understood in the industry. Many people think that the efficiency of a photovoltaic power plant is designed to use 75%-80% efficiency, and it should be run at this efficiency during the operation. So many users have expressed a lot of sentiment about the efficiency of the power plant system: How can today's efficiency be as high as 95%? How is the efficiency of yesterday only 55%? How is the efficiency of this month only 65%? This is not the same as the traditional concept. Is it a problem with my power station? Is TAKOE's surveillance system up and down?
In fact, there is no need to be surprised because the system efficiency of photovoltaic power plants is constantly changing with the irradiation intensity, and the lower the efficiency of irradiation is, the lower the efficiency is. When the irradiation reaches 1000w/m2, the efficiency loss is less than 5% ( Of course, this is the season when the temperature is not very high; what caused this? The main points are as follows:
First, the losses of components, inverters, cables, etc. do not change linearly as we imagine;
Second, when the radiation is very low (cloudy or rainy), there is a phase where the string voltage is too low and the inverter cannot start; (and the radiation is additive)
Thirdly, there is a certain degree of self-consumption of the inverter (self-consumption with small changes in load), which accounts for a high proportion of power generation in low-irradiation situations, leading to a reduction in system efficiency.
How to calculate the peak sunshine hours? System Efficiency Algorithm (X)?
Peak sunshine hours: refers to a parameter that is converted into hours after the instantaneous irradiation value is accumulated. It is used to evaluate the theoretical power generation amount and the irradiation intensity over a period of time; after having this value, it can be easily measured and calculated. System efficiency. The accuracy of this value depends on the sampling accuracy of the weather station and its algorithm. Some companies also call this total radiation.
System Efficiency Algorithm (X): Capacity (kWh) Installed Capacity (kW) ÷ Peak Hours (h) ÷ 100 = X%
What are the steps and methods for improving the efficiency of the entire life cycle of a power station?
First, the optimal design of the power plant should be fully considered. The operation and maintenance team should be involved in the design stage to consider the convenience and economy of the operation and maintenance in the later period.
Second, third-party testing agencies and construction supervision companies should be introduced to strictly control the quality of the power station equipment and construction quality, especially the long-term reliability of the system under harsh outdoor environmental conditions;
Third, a regional operation and maintenance center should be established to reduce the cost of single-project operation and maintenance of distributed power plants.
Fourth, actively explore the critical points of power plant component cleaning in different regions, and maximize the integrated benefits of power generation and cleaning.
Fifth, the actual problems exposed during the operation and maintenance process should be fed back to the design as soon as possible so that they can continuously optimize the follow-up plan.
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