Simulation method for inter-provincial surplus renewable energy transaction in regional electricity market

Abstract

The invention relates to a regional power market inter-province surplus renewable energy transaction simulation method, which comprises the following steps: S1, clearing the power spot market of each province according to the actual parameters of a power system and the power of a regional inter-province tie line, and obtaining the output curve of each unit of each province and the power abandoning condition of a renewable energy unit according to the clearing result; s2, calculating abandoned electric quantity and renewable energy consumption potential of all renewable energy units in each province at each moment; s3, performing inter-province surplus renewable energy transaction when the province has the power abandoning condition in the region and the province has the renewable energy consumption potential, and calculating the transaction electric quantity and the transaction electricity price of each province according to the model; and S4, according to the regional surplus renewable energy source transaction condition, calculating the renewable energy source abandoned electricity quantity and the electricity abandoned rate after the transaction. According to the invention, the inter-provincial transmission lines in the region are fully utilized to promote the consumption of renewable energy in different places, the renewable energy consumption capability of the regional power system is improved, and the method has significance for low-carbon transformation of the power system.

Description

Technical Field

[0001] The present invention relates to the fields of electrical engineering and energy systems, and more specifically, to a simulation method for inter-provincial surplus renewable energy trading in a regional power market. Background Art

[0002] As the reform of the power market is underway, the penetration rate of renewable energy in the power system is also increasing year by year. The large number of renewable energy units connected to the power system makes it difficult to consume renewable energy in real time locally. However, most of the current power market transactions are for intra-provincial power balance, and there are few inter-provincial power transactions, making it difficult to carry out cross-provincial new energy consumption, which in turn greatly increases the rate of renewable energy abandonment in the power system. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a simulation method for inter-provincial surplus renewable energy trading in a regional power market, which fully utilizes the inter-provincial transmission lines within the region to promote the off-site consumption of renewable energy, improve the renewable energy consumption capacity of the regional power system, and thus reduce the power abandonment rate of renewable energy units.

[0004] The technical solution adopted by the present invention to solve the technical problem is: constructing a simulation method for inter-provincial surplus renewable energy trading in a regional power market, comprising the following steps:

[0005] S1. Clear the electricity spot market in each province according to the actual parameters of the power system and the power of the regional inter-provincial tie lines, and obtain the output curve of each unit in each province and the power abandonment of renewable energy units based on the clearing results;

[0006] S2. Calculate the amount of abandoned electricity and renewable energy consumption potential of all renewable energy units in each province at each time;

[0007] S3. When there are provinces with power abandonment in the region and provinces with renewable energy consumption potential, inter-provincial surplus renewable energy transactions are carried out, and the transaction electricity volume and transaction price of each province are calculated according to the model;

[0008] S4. Based on the regional surplus renewable energy trading situation, calculate the renewable energy curtailment amount and curtailment rate after the transaction.

[0009] According to the above scheme, in step S1, the electricity spot market will be simulated and cleared according to the safety constraint unit combination model SCUC and the safety constraint economic dispatch model SCED to obtain the node electricity price at each time and the output curve of each unit, and calculate the abandoned power q of the renewable energy unit i at time t. i，t for:

[0010] q i，t =I i γ i，t -pi，t

[0011] Among them, I i represents the installed capacity of unit i, γ i，t represents the capacity factor of unit i at time t, p i，t Represents the dispatch output of unit i at time t.

[0012] According to the above scheme, in step S2, the total abandoned power of renewable energy q at time t is k，t It is the sum of the power abandonment of all renewable energy units in the province, expressed as:

[0013]

[0014] The renewable energy consumption potential c of province k at time t k，t It is expressed as:

[0015]

[0016] Among them, α j，k Indicates the start and stop status of thermal power unit j, 0 indicates the unit is shut down, 1 indicates the unit is on; p j，t represents the dispatch output of thermal power unit j at time t, I j represents the installed capacity of thermal power unit j, β j Represents the minimum output coefficient of thermal power unit j.

[0017] According to the above scheme, in step S3, the proportion of electricity purchased from outside the province by each province to the load of the province is not greater than ε, that is, the electricity declared by the buyer is:

[0018] d k，t =min{c k，t , ε·l k，t}

[0019] Among them, l k，t represents the load of province k at time t;

[0020] The bid and ask prices are:

[0021] π i =0

[0022]

[0023] The total traded electricity is the smaller of the renewable energy buyer and the renewable energy seller:

[0024]

[0025] If the total electricity quantity declared by the buyer is greater than or equal to the total electricity quantity declared by the seller, then the electricity quantity delivered by the renewable energy units in each province is Q k，tThe electricity consumption reported by each province is evenly distributed, namely:

[0026]

[0027] If the total electricity declared by the buyer is less than the total electricity declared by the seller, the purchase volume of each province will be cleared first with the province with the lower declared price;

[0028] Let the regional inter-provincial transmission and distribution fee be σ, and the buyer's declared price be Since the marginal price of renewable energy is 0, the price difference is:

[0029]

[0030] The profit margins of buyers and sellers are the same, that is, the transaction price can be expressed as:

[0031]

[0032] The method for simulating the inter-provincial surplus renewable energy trading in the regional power market of the present invention has the following features:

[0033] Beneficial effects:

[0034] 1. The present invention can promote the off-site consumption of renewable energy through regional surplus renewable energy trading, make full use of the inter-provincial transmission lines within the region, improve the renewable energy consumption capacity of the regional power system, thereby reducing the power abandonment rate of renewable energy units, which is of great significance to the low-carbon transformation of the power system;

[0035] 2. The present invention can calculate the inter-provincial renewable energy trading volume and the renewable energy power abandonment rate of each province under different inter-provincial transaction ratio restrictions through transaction simulation, thereby providing reference and verification for the inter-provincial transaction model of the regional power market, providing strong support for the development and construction of the regional power market, and is of great significance to the construction of a unified national power market system. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0037] Figure 1 It is a flow chart of the simulation method of the inter-provincial surplus renewable energy transaction in the regional power market of the present invention. DETAILED DESCRIPTION

[0038] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described in detail with reference to the accompanying drawings.

[0039] like Figure 1 As shown, the regional power market inter-provincial surplus renewable energy transaction simulation method of the present invention comprises the following steps:

[0040] S1. Clear the electricity spot market of each province according to the actual parameters of the power system and the power of the regional inter-provincial interconnection lines, and obtain the output curve of each unit in each province and the power abandonment of renewable energy units based on the clearing results.

[0041] The electricity spot market will be simulated and cleared based on the security-constrained unit commitment model (SCUC) and the security-constrained economic dispatch model (SCED) to obtain the node electricity price and output curve of each unit at each time. The amount of abandoned electricity q of renewable energy unit i at time t can be calculated i，t for:

[0042] q i，t =I i γ i，t -p i，t

[0043] Among them, I i represents the installed capacity of unit i, γ i，t represents the capacity factor of unit i at time t, p i，t Represents the dispatch output of unit i at time t.

[0044] S2. Calculate the amount of wasted electricity and renewable energy consumption potential of all renewable energy units in each province at each time.

[0045] The total amount of renewable energy abandoned in province k at time t is q k，t is the sum of the power abandonment of all renewable energy units in the province, which can be expressed as:

[0046]

[0047] The renewable energy consumption potential c of province k at time t k，t It can be expressed as:

[0048]

[0049] Among them, α j，k Indicates the start and stop status of thermal power unit j, 0 indicates the unit is shut down, and 1 indicates the unit is on. j，t represents the dispatch output of thermal power unit j at time t, I j represents the installed capacity of thermal power unit j, β j Represents the minimum output coefficient of thermal power unit j.

[0050] S3. When there are provinces in the region with power abandonment and provinces with renewable energy consumption potential, inter-provincial surplus renewable energy transactions are carried out, and the transaction electricity volume and transaction electricity price of each province are calculated based on the model.

[0051] For the electricity quantity declared by the buyers in each province, the proportion of electricity purchased from other provinces by each province is subject to the trading rules. The proportion of electricity purchased from other provinces in each province’s load is not greater than ε, that is, the electricity quantity declared by the buyers should be:

[0052] d k，t =min{c k，t , ε·l k，t}

[0053] Among them, l k，t represents the load of province k at time t.

[0054] Since the marginal power generation cost of renewable energy units is approximately equal to 0, their marginal bid price is also 0. The cost of electricity purchased by the purchasing province in the province is the medium- and long-term price of thermal power units, that is, the medium- and long-term marginal bid price is the medium- and long-term electricity purchasing cost of the province. Right now:

[0055] π i =0

[0056]

[0057] The total transaction volume is the smaller value between the renewable energy buyer and the renewable energy seller, that is:

[0058]

[0059] If the total electricity quantity declared by the buyer is greater than or equal to the total electricity quantity declared by the seller, then the electricity quantity delivered by the renewable energy units in each province is Q k，t The electricity consumption reported by each province is evenly distributed, namely:

[0060]

[0061] If the total electricity volume declared by the buyer is less than the total electricity volume declared by the seller, the purchase volume of each province will be cleared first based on the province with the lower declared price.

[0062] Let the regional inter-provincial transmission and distribution fee be σ, and the buyer's declared price be Since the marginal price of renewable energy is 0, the price difference is:

[0063]

[0064] This model assumes that the profit margins of buyers and sellers are the same, that is, the transaction price can be expressed as:

[0065]

[0066] S4. Based on the regional surplus renewable energy trading situation, calculate the renewable energy curtailment amount and curtailment rate after the transaction.

[0067] Example

[0068] Take the actual power system data of a region S as an example for case analysis. The region has four provinces A, B, C and D. The total installed capacity of various units in each province is shown in Table 1.

[0069] Table 1 Installed capacity of each province in region S (unit: MW)

[0070] province Thermal Power Wind power Photovoltaic Hydropower A 39980 9123 29895 31121 B 28950 10065 15958 14568 C 74090 22522 41290 2420 D 29940 5780 24107 1391

[0071] After the surplus renewable energy transactions between provinces in the regional power market are carried out according to the method, the renewable energy abandonment rate of each province under different inter-provincial transaction ratio limits ε is shown in Table 2.

[0072] Table 2 Renewable energy curtailment rate in each province under different inter-provincial transaction ratio restrictions

[0073] ε=0% ε=10% ε=20% ε=30% ε=40% ε=50% Area S 9.65％ 5.64％ 4.77％ 4.60％ 4.57％ 4.57％ Province A 5.06％ 4.24％ 4.04％ 3.96％ 3.95％ 3.95％ Province B 10.80％ 6.39％ 5.65％ 5.49％ 5.47％ 5.47％ Province C 13.78％ 6.90％ 5.31％ 5.02％ 4.98％ 4.98％ Province D 4.61％ 3.68％ 3.55％ 3.52％ 3.52％ 3.52％

[0074] After the inter-provincial surplus renewable energy trading in the regional electricity market, the amount of renewable energy curtailment in each province decreased and basically converged when ε=50%. The total amount of regional curtailment decreased from 9.65% to 4.57%.

[0075] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation modes, which are merely illustrative rather than restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the present invention and the claims, all of which are within the protection of the present invention.

Claims

1. A simulation method for inter-provincial surplus renewable energy trading in a regional power market, characterized in that: The following steps are involved: S1. Clear the electricity spot market in each province according to the actual parameters of the power system and the power of the regional inter-provincial tie lines, and obtain the output curve of each unit in each province and the power abandonment of renewable energy units based on the clearing results; S2. Calculate the amount of abandoned electricity and renewable energy consumption potential of all renewable energy units in each province at each time; S3. When there are provinces with power abandonment in the region and provinces with renewable energy consumption potential, inter-provincial surplus renewable energy transactions are carried out, and the transaction electricity volume and transaction price of each province are calculated according to the model; S4. Based on the regional surplus renewable energy trading situation, calculate the renewable energy curtailment amount and curtailment rate after the transaction.

2. The method for simulating surplus renewable energy transactions between provinces in a regional power market according to claim 1 is characterized in that: In step S1, the electricity spot market will simulate and clear according to the safety constraint unit combination model SCUC and the safety constraint economic dispatch model SCED to obtain the node electricity price at each time and the output curve of each unit, and calculate the abandoned power q of the renewable energy unit i at time t. i，t for: q i，t =I i ·γ i，t -p i，t Among them, I i represents the installed capacity of unit i, γ i，t represents the capacity factor of unit i at time t, p i，t Represents the dispatch output of unit i at time t.

3. The method for simulating surplus renewable energy transactions between provinces in a regional power market according to claim 1, characterized in that: In step S2, the total abandoned power of renewable energy q at time t is k，t It is the sum of the power abandonment of all renewable energy units in the province, expressed as: The renewable energy consumption potential c of province k at time t k，t It is expressed as: Among them, α j，k Indicates the start and stop status of thermal power unit j, 0 indicates the unit is shut down, 1 indicates the unit is on; p j，t represents the dispatch output of thermal power unit j at time t, I j represents the installed capacity of thermal power unit j, β j Represents the minimum output coefficient of thermal power unit j.

4. The method for simulating surplus renewable energy transactions between provinces in a regional power market according to claim 1, characterized in that: In step S3, the proportion of electricity purchased from outside the province to the load of the province is not greater than ε, that is, the electricity declared by the buyer is: d k，t =min{c k，t ,e·l k，t } Among them, l k，t represents the load of province k at time t; The bid and ask prices are: π i ＝0 The total traded electricity is the smaller of the renewable energy buyer and the renewable energy seller: If the total electricity quantity declared by the buyer is greater than or equal to the total electricity quantity declared by the seller, then the electricity quantity delivered by the renewable energy units in each province is Q k，t The electricity consumption reported by each province is evenly distributed, namely: If the total electricity declared by the buyer is less than the total electricity declared by the seller, the purchase volume of each province will be cleared first with the province with the lower declared price; Let the regional inter-provincial transmission and distribution fee be σ, and the buyer's declared price be Since the marginal price of renewable energy is 0, the price difference is: The profit margins of buyers and sellers are the same, that is, the transaction price can be expressed as:

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