In a distributed PV project that is used for its own use, the project's annual income must be calculated for the project's power generation and electricity prices. The power generation of the project depends on solar energy resources for prediction and will not be discussed for the time being. How will the electricity price of the distributed project be discussed today?
First, the price of electricity sold
Since the electricity price of a distributed project is based on the price of electricity for sale, the current method of calculating the price of electricity for sale in our country is very complex and generally divided into: peak hour electricity price, normal electricity price, and valley electricity price, and some will have peak electricity price. , as shown in the table below.
Some people think that photovoltaics do not generate electricity at night and should limit the calculated time period to 9:00 to 15:00. But there are many problems:
a) The PV output time varies from place to place. Therefore, the calculated time period should theoretically not be the same. Therefore, it should not be limited to 9:00 to 15:00. In many places in the west, the output is still at 18:00. Very high.
b) Even at the time of power generation, the output from 9:00 to 10:00 and from 12:00 to 13:00 is completely different and is calculated on the same weight. It is obviously unreasonable.
In summary, weighting by time is not a particularly reasonable calculation method.
2) Weighted by output ratio
Weighting with different power rates should be the most reasonable calculation method. Its formula should be as follows:
Calculations using the above method not only take into account the differences in output during different time periods, but also simplify the calculation method. Therefore, I personally think that this is a reasonable method of weighted calculation, and it is also a calculation method that I am more accustomed to using in my work.
Third, the summary
In actual work, depending on the actual situation, the calculation method of the project's weighted electricity price will also be different.
Calculating the weighted price of a distributed project with "average output ratio weighting" is just a habit in my personal work. We also welcome everyone to introduce other more reasonable and simpler calculation methods.
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