We all know that economic efficiency is the final comprehensive measure of all economic activities. How to consider the economic benefits of photovoltaic power plants? It is nothing more than a comprehensive consideration of cost, power station quality, and power generation. For a photovoltaic power plant to obtain sustained benefits, it is first necessary to control the construction cost of the power station. Secondly, the quality of components, inverters, etc. of the power station is sufficient to meet the service life of 20-25 years, and there is a stable power generation amount.
It's easy to say from one to three, and you can finish it in minutes. But how do you do it? Not a single sentence can be made clear. Today we analyze from the aspects of major equipment selection, system configuration and other aspects to see how to increase the economic benefits of photovoltaic power plants.
First, the main equipment selection
After the photovoltaic power station is built, the impact on power generation will be affected by the efficiency of photovoltaic modules and inverters in addition to natural factors.
NO.1 photovoltaic modules:
1. Improve the conversion efficiency: It helps to reduce the investment in land occupation, support, DC cables, civil engineering, and installation, but the high-efficiency components are more expensive. The current situation is beyond our means.
2. Decrease attenuation: currently 20% in 25 years. If it is reduced to 15%, the average power generation in 25 years will increase by 2.5%.
3, to improve consistency: the consistency of the impact of the component string is generally 2% -10%, usually taken 3% -4%, there is no actual test data.
NO.2 inverter:
1, to improve conversion efficiency: currently about 96% -98%, the general requirements of 97%, optimizing the space 1% -2%
2. New technology application: Distributed inverters and 1500V inverters can reduce DC line losses by 1%-2% in addition to improved efficiency.
Second, the system configuration
NO.1 DC side voltage boost and capacity increase of power generation unit:
Increase DC voltage: Reduce DC line losses and investment in DC cables and combiner boxes to provide favorable conditions for increasing the capacity of power generation units. Increase power generation unit capacity: Reduce investment in inverter booster stations, inverters, box changes, and AC Cable cost.
N0.2 power generation unit PV module overweight:
Increased investment: Investment in photovoltaic modules, land, supports, and DC cables increased, accounting for approximately 60% of unit investment. Incremental power generation: Take an over-provision of 10% as an example, an increase of about 8%-9% in power generation; a profitable increase in power generation: about 2%-3%
Third, the photovoltaic module layout
NO.1 manually adjustable bracket system
Increased investment: The cost of scaffolds increased by about 0.2 yuan/w, which is about 2.5% of unit investment. Increment of power generation: it can increase about 5% benefit. Increase of power generation: about 2.5%
NO.2 flat single-axis tracking system:
Increased investment: about 7.5% of the total project investment. Increment of power generation: increase of 15%-20%; increase of profitable power generation: approximately 7.5%-12.5%
NO.3 inclined single axis tracking system:
Increased investment: support cost, land occupation, and cables account for approximately 10% of the total project investment. Power generation increments: increase by 20%-26%. Effective incremental power generation: about 9%-15%
Fourth, collector circuit optimization
NO.1 DC line loss:
Transmission line selection and path optimization. Generally take 2%-3%. The optimized collector circuit design can be controlled under 1.5% and the optimized space is about 0.5%-1.5%.
NO.2 AC line loss:
Usually take 1.5%-2.5%, this part is greatly affected by the conditions of external delivery, different items are different, not considered.
Fifth, operation and maintenance optimization
NO.1 cleaning and maintenance:
The impact of the surface of the module is generally in the range of 2% to 10%, generally 3% to 4%, but the cleaning is greatly affected by the local water resources and the optimized space is approximately 1% to 3%.
NO.2 intelligent control and management:
Intelligent control can make the system's own performance fully utilized. High-efficiency management can detect problems in time and deal with them in time to ensure that the system operates efficiently and stably.
Conclusion: In terms of optimizing the space mentioned in the article, we stand in an idealistic perspective. In fact, some parts of the optimization space cannot be achieved. In order to obtain large economic benefits for the power station, we must consider all aspects and welcome friends to share relevant experiences and Experience.
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