Power generation plan considering priority generation under power spot market environment

In terms of planned electricity generation, the base electricity is issued in accordance with 50% of the entire society's electricity consumption, and the approved on-grid electricity price (0.45 yuan/KWH) is implemented. The power consumption scale of non-market users is set at 50% of the whole society's electricity consumption, and the directory price is implemented (0.55 yuan/KWH).

In terms of market power generation, the scale of market users' electricity consumption is set at 50% of the whole society's electricity consumption. The medium and long-term contract scale is issued according to the market electricity consumption, and the buyers and sellers have high enthusiasm for trading, and the medium and long-term contracts are all signed, and the contract price is 0.32 yuan/KWH, lower than the spot market price. Spot market time-share prices refer to Table 1 data. The market settlement price is the absolute price of electricity energy considering the transmission and distribution price, and the transmission and distribution price is executed in accordance with 0.12 yuan/KWH.

The spot market settlement mechanism requires that the base power and medium - and long-term contract power be decomposed into the daily time-sharing power curve, and the deviation settlement is carried out with the spot market clearing curve. The base power is decomposed according to the typical average curve of the whole day, and the medium - and long-term contract curve is determined according to the shape of the user's real-time electricity consumption curve.

2.2 Analysis of Results

2.2.1 Impact on the interests of market entities

In the scenario constructed by the example, the market generation and non-market generation strictly match, and the power consumption space is completely covered by the base power and the medium and long-term contract power when the contract is signed. According to the power plan formulation process designed in Section 4.2, the power plan is equivalent to the priority power generation, and the demand for power supply and peak and frequency regulation of non-operating users is fully guaranteed.

When medium - and long-term electricity cannot be fully contracted because power generation enterprises or power users do not actively participate in the market, medium - and long-term contracts and base electricity cannot cover all electricity consumption, and the interests of market members will be affected. Table 2 shows the income/expenditure levels of market members in the medium to long term when electricity cannot be fully contracted. Section 4.2 In the design process, uncontracted contracts are issued in the form of base electricity. Therefore, the higher the proportion of uncontracted medium and long term electricity, the more electricity settled at the high price of on-grid electricity price on the power generation side, and the higher the total revenue on the power generation side. The non-contracting market-oriented electricity is equivalent to the power grid company purchasing high-priced base electricity to supply power to market-oriented users, and the relevant unbalanced funds are borne by users. Therefore, the higher the proportion of uncontracted medium - and long-term electricity, the higher the cost of market users.

The price level of non-market users is stable and is not affected by the proportion of market contracts. Under the condition of stable electricity consumption structure, the future income mechanism of "purchase and sale price difference + transmission and distribution price" of power grid companies can also ensure relatively stable income.

2.2.1 Analysis of the incentive effect on the trading of market entities

In order to study the incentive effect of the electricity plan formulation process proposed in the paper on market players to participate in medium and long-term contract transactions, the calculation example considers the "high price" scenario in which the medium and long-term contract is higher than the clearing price in the spot market (the medium and long-term contract price is set at 0.38 yuan/KWH), and the scenario in which the non-contracted electricity is not delivered.

The unit electricity cost of market users in different scenarios is shown in Table 3. Whether the uncontracted electricity is delivered according to the base electricity, and the market contract price level has little influence on the trend relationship between the electricity cost of market users and the contract contracting ratio: the higher the proportion of uncontracted contracts, the higher the unit electricity cost of market-oriented users. After the medium and long term contract locks in part of the expenditure, the total market electricity consumption expenditure of market users is mainly determined by the deviation between the day-ahead clearing curve and the medium and long term contract decomposition curve. The proportion of medium and long term uncontracted contracts increased, the spot market deviation settlement cost increased, and the electricity cost increased.

The unit market-based generation income of power generation enterprises under different scenarios is shown in Table 4. Whether the uncontracted electricity is delivered according to the base electricity affects the unit market generation income level of the power generation enterprise. According to the electricity plan formulation method designed in this paper, the quantity of non-contracted contracts will be issued as planned electricity, and the proportion of non-contracted contracts will increase, and the unit market electricity income of power generation enterprises will decrease. The non-contracted electricity is issued at the base amount of electricity, the spot market space is small, and the income of the spot market is difficult to make up for the decrease in the medium and long term income of power generation enterprises caused by the increase of non-contracted contracts. This trend becomes more pronounced when the price of medium - and long-term contracts increases.