The promotion and application of distributed photovoltaic power plants requires the understanding and support of the entire society. However, when the author communicated with some companies, many business owners had some misunderstandings about distributed photovoltaic power plants. Among them, the biggest misunderstanding was that after the photovoltaic power plant was launched, the company’s use of power grids was reduced, and the company’s transformer capacity fees were still the same as before. The amount remained the same, which led to the high weighted electricity price of photovoltaic power plant enterprises, so that some owners did not have much interest in photovoltaic power plants and their enthusiasm was not high.
To eliminate misunderstandings, first of all, to understand the price structure of large industrial electricity, see the following figure:
Note: There are differences in the relevant prices in the maps and they are for reference only.
As shown in the above figure, China has implemented two-part tariffs for electricity for large industries. The so-called two-part system, part of which is called the basic electricity price, is calculated based on the company's capacity (kVA) or the customer's maximum demand (kW). It is commonly called the capacity fee or demand fee. No matter whether the company uses electricity or not, it needs to pay. The actual power consumption is irrelevant. The capacity refers to the capacity of the enterprise's transformer. The maximum demand refers to the maximum power consumption of the enterprise that is monitored in real time. It is usually detected every 15 minutes.
What needs to be explained is that after the operation of the photovoltaic power plant, the power of the enterprise to use the power of the power network is reduced during the day, and the maximum power at night is still the same as before. Therefore, the basic power price calculated according to the maximum demand is kept constant. of. Of course, according to the transformer capacity, it is also consistent.
The other part is called the electricity price, according to the actual electricity consumption of the company, combined with the corresponding electricity price calculation, how much electricity to pay, has nothing to do with the company's transformer capacity and power demand. The electricity price is the implementation of the time-share price, which is commonly known as the peak Pinggu price. In addition to the basic electricity price and electricity price, the power supply companies also need to collect certain government funds and surcharges with electricity.
In addition, depending on how much reactive power is used by the company, the power supply company will award/punish a part of the power factor adjustment tariff. This amount varies with the power factor and varies from month to month. Therefore, the PV power station is put into operation or not. Less affected.
Returning to the above-mentioned corporate misunderstandings, business owners simply believe that the introduction of photovoltaic power plants has led to a reduction in the total amount of power used by the power grid, and that the basic power tariff has not been reduced, thus making the total weighted power price of the power grid high. This is actually a psychological effect. That is, not using so much electricity before the National Grid, but also paying the same capacity charge as before, is reluctant. However, they did not consider that after the photovoltaic power stations were operated, they not only reduced the electricity prices during the day, but also reduced the corresponding government funds and surcharges for the power generated by the photovoltaic power plants. The two fees were higher than the capacity fees. The imaginary part of the money has to be a lot more, about 3 times. Therefore, we have to pay a little bit more capacity in form (in fact, regardless of whether or not we use electricity, we need to pay capacity or demand fees, and there is no overpayment). worth it.
The promotion of distributed power plants requires the majority of photovoltaic industry practitioners to make greater efforts to allow the society to understand and accept distributed photovoltaics. Photovoltaic Experience Network is willing to contribute to the promotion of distributed photovoltaic power plants. I hope this article can make More people see. (The author WeChat public account: Photovoltaic experience network)
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