Afterwards market power correction method and system for electric power spot market

Abstract

The invention discloses an afterward market power correction method for an electric power spot market. The afterward market power correction method comprises the steps of obtaining data information of a target electric power market; after the target electricity market is cleared, judging whether the target electricity market on the current day needs post market power correction or not; re-clearing the target electricity market to obtain the clearing electricity price of each node of the re-cleared target electricity market in each time period; calculating the price influence contribution rate of each power generation group and determining the compensation amount of each power generation group; and calculating the return amount of each user in the power market, and completing afterward market power correction of the target power spot market. The invention also discloses a system for realizing the afterward market power correction method for the electric power spot market. According to the method, post market power correction for the electric power spot market is realized, safe and stable development of the electric power market and safe and stable operation of an electric power system are ensured, and the method is higher in reliability, better in accuracy, more objective and more scientific.

Description

Technical Field

[0001] The present invention belongs to the field of electrical automation, and in particular relates to a method and system for post-market power correction in a power spot market. Background Art

[0002] With the development of economy and technology and the improvement of people's living standards, electricity has become an indispensable secondary energy source for people's production and life, bringing endless convenience to people's production and life. Therefore, ensuring the stable and reliable supply of electricity has become one of the most important tasks of the power system.

[0003] At present, although the electricity market has undergone a long period of development, it is still in its early stages. In the early stages of the electricity market, the natural monopoly of the power system itself and the lack of elasticity in electricity consumption demand have given power generation groups great market manipulation capabilities in the electricity market. This situation may allow power generation groups to manipulate the spot price of electricity in the electricity market, thereby greatly disrupting the order of the electricity market and affecting the safe and stable operation of the power system.

[0004] However, there is currently a lack of an accurate, objective and scientific solution to correct the ex post market power in the electricity spot market; this situation has also greatly restricted the development of the electricity market and the safe and stable operation of the power system. Summary of the invention

[0005] One of the purposes of the present invention is to provide a method for post-market power correction in the electricity spot market that is highly reliable, accurate, objective and scientific.

[0006] A second objective of the present invention is to provide a system for implementing the method for post-market power correction in the electricity spot market.

[0007] The method for post-market power correction in the electricity spot market provided by the present invention comprises the following steps:

[0008] S1. Obtain data information of the target power market;

[0009] S2. After the target power market is cleared, determine whether the target power market on that day needs to be corrected for market power ex post based on the data information obtained in step S1;

[0010] S3. Re-clearing the target power market according to the data information obtained in step S1 to obtain the clearing electricity prices of each node in the target power market in each time period after re-clearing;

[0011] S4. Based on the average electricity price of each power generation group and time-sharing node and the actual average clearing electricity price, calculate the price impact contribution rate of each power generation group and determine the compensation amount of each power generation group;

[0012] S5. Calculate the refund amount for each user in the electricity market based on the settlement method of the target electricity market, and complete the post-market power correction of the target electricity spot market.

[0013] The step S1 of acquiring the data information of the target power market specifically includes the following steps:

[0014] Acquire data information of a target power market, wherein the data information includes data information of generator sets, data information of load nodes, data information of tie lines, data information of lines, and data information of power systems;

[0015] The generator set data information includes the power generation group to which the generator set belongs, the generator set capacity, the upper and lower limits of the generator set output, the fixed output plan of the generator set, the generator set ramp rate, the generator set startup cost, the maximum start and stop time of the generator set, the most efficient start and stop time of the generator set, and the start and stop curve of the generator set;

[0016] The load node data information includes the load forecast value of each user in each time period;

[0017] The tie line data information includes the connection nodes of the tie line and the output plan of the tie line;

[0018] The line data information includes the maximum transmission capacity of the line or section and the power flow distribution factor of the relevant nodes of the line or section;

[0019] The power system data information includes positive and negative reserve constraints of the power system and spinning reserve constraints of the power system.

[0020] After the target power market is cleared, step S2 determines whether the target power market on that day needs to be corrected for market power ex post based on the data information obtained in step S1, which specifically includes the following steps:

[0021] Set the target electricity market clearing threshold P REF and trigger multiple λ TD ;

[0022] The average node clearing price P of the target power market on that day is calculated using the following formula: AVE

[0023]

[0024] Where P i,t is the clearing price of the i-th generator in the target power market in period t; Q i,t is the clearing power of the ith generator in the target power market in period t; N is the total number of generators in the target power market; T is the total number in period t;

[0025] The following rules are used to determine the ex post market power correction:

[0026] If P AVE Greater than P REF ·λ TD , it is determined that the target power market of the day needs to be corrected for market power ex post, and the subsequent steps are continued;

[0027] Otherwise, it is determined that the target electricity market for that day does not require ex post market power correction and the algorithm ends.

[0028] Step S3, according to the data information obtained in step S1, re-clears the target power market to obtain the clearing electricity prices of each node in each time period of the target power market after re-clearing, specifically includes the following steps:

[0029] The reference price RefPrice of the i-th generator set is calculated using the following formula: i :

[0030] RefPrice i =(Cost mp +Cost O&M )*kk

[0031] Cost mp Cost is the marginal power generation cost of the i-th generator set; O&M is the variable operation and maintenance cost of the i-th generator set; kk is the set premium coefficient, which is used to cover the long-term investment cost and short-term power generation cost of the i-th generator set, and kk>1;

[0032] The reference price RefPrice of the i-th generator set is obtained i Instead of the real bid of the i-th generator unit, the target power market is re-cleared; during the re-clearing process, the clearing method adopts the clearing method of safety-constrained unit combination + safety-constrained economic dispatch + node electricity price mechanism;

[0033] The clearing electricity prices of each node in the target power market at each time period are obtained after re-clearing.

[0034] The step S4 calculates the price impact contribution rate of each power generation group based on the average electricity price of each power generation group and the time-sharing node and the actual average clearing electricity price, and determines the compensation amount of each power generation group, which specifically includes the following steps:

[0035] The actual node average electricity price P for time period t of the day is calculated using the following formula: t AVE :

[0036]

[0037] The following formula is used to calculate the node average electricity price of the jth power generation group in time period t after re-clearing on the day:

[0038]

[0039] In the formula is the clearing electricity price of the i-th generating unit of the j-th generating group in time period t after re-clearing on the day; is the clearing power of the i-th generator unit of the j-th power generation group in time period t after re-clearing on the same day; N j is the total number of generating units of the jth generating group;

[0040] The price impact contribution rate ω of the jth power generation group is calculated using the following formula: j :

[0041]

[0042] The total excess revenue ΔR on the power generation side is calculated using the following formula:

[0043]

[0044] Where G t is the settlement electricity quantity in the target electricity market during period t;

[0045] Finally, the compensation amount ΔR of the jth power generation group is calculated using the following formula: j :

[0046] ΔR j =μ j ×ΔR×ω j

[0047] Where μ j is the penalty coefficient of the j-th power generation group.

[0048] The step S5 of calculating the refund amount of each user in the power market according to the settlement method of the target power market specifically includes the following steps:

[0049] Determine the settlement method of the target power market; the settlement method includes a method of using a unified electricity price settlement method and a method of using a node electricity price settlement method;

[0050] For the power market that adopts the node electricity price settlement method, the following steps are used to calculate the refund amount for each user in the power market:

[0051] The following formula is used to calculate the amount refund ratio ω of the kth user in the target power market:k :

[0052]

[0053] In the formula is the average time-of-use electricity price at the user side, and P k,t is the electricity price of the kth user in time period t, Q k,t is the electricity consumption of the kth user in time period t, N l is the total number of users, is the average electricity price of the kth user in time period t;

[0054] Finally, the return amount ΔR of the kth user is calculated using the following formula: k :

[0055] ΔR k =μ k ×ΔR×ω k

[0056] Where μ k is the allocation coefficient of the kth user;

[0057] For the electricity market that adopts the unified electricity price settlement method, the refund amount for each user in the electricity market is calculated according to the proportion of market electricity volume as follows:

[0058] Calculate the amount refund ratio ω for the kth user k for

[0059] Finally, the return amount ΔR of the kth user is calculated k ΔR k =μ k ×ΔR×ω k .

[0060] The present invention also provides a system for implementing the method for post-market power correction for the electricity spot market, comprising a data acquisition module, a correction determination module, a re-clearing module, a group compensation module and a user return module; the data acquisition module, the correction determination module, the re-clearing module, the group compensation module and the user return module are connected in series in sequence; the data acquisition module is used to acquire data information of the target electricity market, and upload the data information to the correction determination module; the correction determination module is used to determine whether the target electricity market on that day needs post-market power correction based on the received data information after the target electricity market is cleared, and upload the data information to the re-clearing module; the re-clearing module is used to determine whether the target electricity market needs post-market power correction based on the received data information The target power market is re-cleared according to the acquired data information, and the clearing electricity price of each node in the target power market in each time period after re-clearing is obtained, and the data information is uploaded to the group compensation module; the group compensation module is used to calculate the price impact contribution rate of each power generation group based on the received data information, the average electricity price of each power generation group and the time-sharing node and the actual average clearing electricity price, and determine the compensation amount of each power generation group, and upload the data information to the user return module; the user return module is used to calculate the return amount of each user in the power market according to the received data information and the settlement method of the target power market, and complete the ex post market power correction of the target power spot market.

[0061] The method and system for post-market power correction for the electricity spot market provided by the present invention not only realizes the post-market power correction for the electricity spot market and ensures the safe and stable development of the electricity market and the safe and stable operation of the power system by acquiring and judging the clearing data of the target electricity market and calculating the clearing electricity amount of the target electricity market, but also has higher reliability, better accuracy, and is more objective and scientific. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] Figure 1 The figure is a schematic diagram of the method flow of the present invention.

[0063] Figure 2 Schematic diagram of the functional modules of the system of the present invention. DETAILED DESCRIPTION

[0064] like Figure 1 The method flow diagram of the method of the present invention is shown as follows: The post-market power correction method for the electricity spot market disclosed in the present invention comprises the following steps:

[0065] S1. Obtaining data information of the target power market; specifically including the following steps:

[0066] Acquire data information of a target power market, wherein the data information includes data information of generator sets, data information of load nodes, data information of tie lines, data information of lines, and data information of power systems;

[0067] The generator set data information includes the power generation group to which the generator set belongs, the generator set capacity, the upper and lower limits of the generator set output, the fixed output plan of the generator set, the generator set ramp rate, the generator set startup cost, the maximum start and stop time of the generator set, the most efficient start and stop time of the generator set, and the start and stop curve of the generator set;

[0068] The load node data information includes the load forecast value of each user in each time period;

[0069] The tie line data information includes the connection nodes of the tie line and the output plan of the tie line;

[0070] The line data information includes the maximum transmission capacity of the line or section and the power flow distribution factor of the relevant nodes of the line or section;

[0071] The power system data information includes positive and negative reserve constraints of the power system and spinning reserve constraints of the power system;

[0072] S2. After the target power market is cleared, based on the data information obtained in step S1, determine whether the target power market on that day needs to be corrected for market power after the fact; specifically, the following steps are included:

[0073] Set the target electricity market clearing threshold P REF and trigger multiple λ TD ;

[0074] The average node clearing price P of the target power market on that day is calculated using the following formula: AVE

[0075]

[0076] Where P i,t is the clearing price of the i-th generator in the target power market in period t; Q i,t is the clearing power of the ith generator in the target power market in period t; N is the total number of generators in the target power market; T is the total number in period t;

[0077] The following rules are used to determine the ex post market power correction:

[0078] If P AVE Greater than P REF ·λ TD , it is determined that the target power market of the day needs to be corrected for market power ex post, and the subsequent steps are continued;

[0079] Otherwise, it is determined that the target electricity market of the day does not need to conduct ex post market power correction, and the algorithm ends;

[0080] S3. Re-clearing the target power market according to the data information obtained in step S1 to obtain the clearing electricity prices of each node in the target power market in each time period after re-clearing; specifically comprising the following steps:

[0081] The reference price RefPrice of the i-th generator set is calculated using the following formula: i :

[0082] RefPrice i =(Cost mp +Cost O&M )*kk

[0083] Cost mp Cost is the marginal power generation cost of the i-th generator set, which includes marginal fuel cost, additional cost of grid management, additional cost of greenhouse gas and opportunity cost of some resources; Cost O&M is the variable operation and maintenance cost of the i-th generator set; kk is the set premium coefficient, which is used to cover the long-term investment cost and short-term power generation cost of the i-th generator set, and kk>1; the preferred value of kk is 110%;

[0084] The reference price RefPrice of the i-th generator set is obtained i Instead of the real bid of the i-th generator unit, the target power market is re-cleared; during the re-clearing process, the clearing method adopts the clearing method of safety-constrained unit combination + safety-constrained economic dispatch + node electricity price mechanism;

[0085] Obtain the clearing electricity prices of each node in the target power market at each time period after re-clearing;

[0086] When re-clearing, the data required is the data obtained in step S1;

[0087] S4. Based on the average electricity price of each power generation group and time-sharing node and the actual average clearing electricity price, calculate the price impact contribution rate of each power generation group and determine the compensation amount of each power generation group; specifically, the steps include:

[0088] The actual node average electricity price P for time period t of the day is calculated using the following formula: t AVE :

[0089]

[0090] The following formula is used to calculate the node average electricity price of the jth power generation group in time period t after re-clearing on the day:

[0091]

[0092] In the formula is the clearing electricity price of the i-th generating unit of the j-th generating group in time period t after re-clearing on the day; is the clearing power of the i-th generator unit of the j-th power generation group in time period t after re-clearing on the same day; N j is the total number of generating units of the jth generating group;

[0093] The price impact contribution rate ω of the jth power generation group is calculated using the following formula: j :

[0094]

[0095] The total excess revenue ΔR on the power generation side is calculated using the following formula:

[0096]

[0097] Where G t is the settlement electricity quantity in the target electricity market during period t;

[0098] Finally, the compensation amount ΔR of the jth power generation group is calculated using the following formula: j :

[0099] ΔR j =μ j ×ΔR×ω j

[0100] Where μ j is the penalty coefficient of the jth power generation group; in specific implementation, μ j It can be set to 1 first. When the electricity market matures, the social welfare transfer caused by the abuse of market power can be further corrected by increasing this coefficient, which is conducive to curbing the exercise of market power.

[0101] If ΔR j is a positive value, it means that the amount that the j-th power generation group needs to return is ΔR j , if ΔR j If it is a negative value, it means that the amount required to compensate the jth power generation group is ΔR j ;

[0102] S5. Calculate the refund amount of each user in the power market according to the settlement method of the target power market, and complete the post-market power correction of the target power spot market; specifically, the following steps are included:

[0103] Determine the settlement method of the target power market; the settlement method includes a method of using a unified electricity price settlement method and a method of using a node electricity price settlement method;

[0104] For the power market that adopts the node electricity price settlement method, the following steps are used to calculate the refund amount for each user in the power market:

[0105] The following formula is used to calculate the amount refund ratio ω of the kth user in the target power market: k :

[0106]

[0107] In the formula is the average time-of-use electricity price at the user side, and P k,t is the electricity price of the kth user in time period t, Q k,t is the electricity consumption of the kth user in time period t, N l is the total number of users, is the average electricity price of the kth user in time period t;

[0108] Finally, the return amount ΔR of the kth user is calculated using the following formula: k :

[0109] ΔR k =μ k ×ΔR×ω k

[0110] Where μ k is the allocation coefficient of the kth user;

[0111] For the electricity market that adopts the unified electricity price settlement method, the refund amount for each user in the electricity market is calculated according to the proportion of market electricity volume as follows:

[0112] Calculate the amount refund ratio ω for the kth user k for

[0113] Finally, the return amount ΔR of the kth user is calculated k ΔR k =μ k ×ΔR×ω k .

[0114] The method of the present invention is further described below in conjunction with an embodiment:

[0115] Assume that there are Group A and Group B on the power generation side, with units a1, a2 and b1, b2 respectively, the clearing threshold is 380 yuan / MWh, the trigger multiple is 1.1, and the actual average clearing price is 420 yuan / MWh>380*1.1, triggering the post-correction mechanism. The clearing results of each period of the day are the same. The actual clearing data on the power generation side and the clearing data after the replacement quotation are shown in Table 1 below:

[0116] Table 1 Schematic diagram of clearing data

[0117]

[0118] The user-side clearing data is shown in Table 2 below:

[0119] Table 2 User side clearing data diagram

[0120]

[0121] The actual time-of-use clearing average electricity price in the market is 420 yuan / MWh. After the groups replaced their quotations, the average clearing price was 320 yuan / MWh. Therefore, the price impact contribution rate ω A =ω B =0.5; assuming μ j are 1; the total excess profit on the power generation side is ΔR = 60000*(420-320) = 6000000 yuan, and the excess profits that need to be compensated by Group A and Group B are ΔR A =ΔR B =300,000 yuan;

[0122] The user side calculates the return ratio The return fee is ΔR x =ΔR y =ΔR z =2,000,000 yuan.

[0123] like Figure 2The figure shows a schematic diagram of the functional modules of the system of the present invention: the system disclosed in the present invention for realizing the method for post-market power correction for the electricity spot market comprises a data acquisition module, a correction determination module, a re-clearing module, a group compensation module and a user return module; the data acquisition module, the correction determination module, the re-clearing module, the group compensation module and the user return module are connected in series in sequence; the data acquisition module is used to acquire data information of the target electricity market, and upload the data information to the correction determination module; the correction determination module is used to determine whether the target electricity market on that day needs post-market power correction based on the received data information after the target electricity market is cleared, and upload the data information to the re-clearing module; the re-clearing module The module is used to re-clear the target power market according to the received data information, obtain the clearing electricity price of each node in the target power market in each time period after re-clearing, and upload the data information to the group compensation module; the group compensation module is used to calculate the price impact contribution rate of each power generation group based on the received data information, the average electricity price of each power generation group and the time-sharing node and the actual average clearing electricity price, and determine the compensation amount of each power generation group, and upload the data information to the user return module; the user return module is used to calculate the return amount of each user in the power market according to the received data information and the settlement method of the target power market, and complete the ex post market power correction of the target power spot market.

Claims

1. A method for post-market power correction in the electricity spot market, comprising the following steps: S1. Obtain data information of the target power market; S2. After the target power market is cleared, determine whether the target power market on that day needs to be corrected for market power ex post based on the data information obtained in step S1; S3. Re-clearing the target power market according to the data information obtained in step S1 to obtain the clearing electricity prices of each node in the target power market in each time period after re-clearing; S4. Based on the average electricity price of each power generation group and time-sharing node and the actual average clearing electricity price, calculate the price impact contribution rate of each power generation group and determine the compensation amount of each power generation group; S5. Calculate the refund amount for each user in the electricity market based on the settlement method of the target electricity market, and complete the post-market power correction of the target electricity spot market.

2. The method for post-market power correction in the electricity spot market according to claim 1, characterized in that The step S1 of acquiring the data information of the target power market specifically includes the following steps: Acquire data information of a target power market, wherein the data information includes data information of generator sets, data information of load nodes, data information of tie lines, data information of lines, and data information of power systems; The generator set data information includes the power generation group to which the generator set belongs, the generator set capacity, the upper and lower limits of the generator set output, the fixed output plan of the generator set, the generator set ramp rate, the generator set startup cost, the maximum start and stop time of the generator set, the most efficient start and stop time of the generator set, and the start and stop curve of the generator set; The load node data information includes the load forecast value of each user in each time period; The tie line data information includes the connection nodes of the tie line and the output plan of the tie line; The line data information includes the maximum transmission capacity of the line or section and the power flow distribution factor of the relevant nodes of the line or section; The power system data information includes positive and negative reserve constraints of the power system and spinning reserve constraints of the power system.

3. The method for post-market power correction in the electricity spot market according to claim 2 is characterized in that After the target power market is cleared, step S2 determines whether the target power market on that day needs to be corrected for market power ex post based on the data information obtained in step S1, which specifically includes the following steps: Set the target electricity market clearing threshold P REF and trigger multiple λ TD ; The average node clearing price P of the target power market on that day is calculated using the following formula: AVE Where P i,t is the clearing price of the i-th generator in the target power market in period t; Q i,t is the clearing power of the ith generator in the target power market in period t; N is the total number of generators in the target power market; T is the total number in period t; The following rules are used to determine the ex post market power correction: If P AVE Greater than P REF ·λ TD , it is determined that the target power market of the day needs to be corrected for market power ex post, and the subsequent steps are continued; Otherwise, it is determined that the target electricity market for that day does not require ex post market power correction and the algorithm ends.

4. The method for post-market power correction in the electricity spot market according to claim 3 is characterized in that Step S3, according to the data information obtained in step S1, re-clears the target power market to obtain the clearing electricity prices of each node in each time period of the target power market after re-clearing, specifically includes the following steps: The reference price RefPrice of the i-th generator set is calculated using the following formula: i : RefPrice i =(Cost mp +Cost O&M )*kk Cost mp Cost is the marginal power generation cost of the i-th generator set; O&M is the variable operation and maintenance cost of the i-th generator set; kk is the set premium coefficient, which is used to cover the long-term investment cost and short-term power generation cost of the i-th generator set, and kk>1; The reference price RefPrice of the i-th generator set is obtained i Instead of the real bid of the i-th generator unit, the target power market is re-cleared; during the re-clearing process, the clearing method adopts the clearing method of safety-constrained unit combination + safety-constrained economic dispatch + node electricity price mechanism; The clearing electricity prices of each node in the target power market at each time period are obtained after re-clearing.

5. The method for post-market power correction in the electricity spot market according to claim 4 is characterized in that The step S4 calculates the price impact contribution rate of each power generation group based on the average electricity price of each power generation group and the time-sharing node and the actual average clearing electricity price, and determines the compensation amount of each power generation group, which specifically includes the following steps: The actual node average electricity price P for time period t of the day is calculated using the following formula: t AVE : The following formula is used to calculate the node average electricity price of the jth power generation group in time period t after re-clearing on the same day: In the formula is the clearing electricity price of the i-th generating unit of the j-th generating group in time period t after re-clearing on the day; is the clearing power of the i-th generator unit of the j-th power generation group in time period t after re-clearing on the same day; N j is the total number of generating units of the jth generating group; The price impact contribution rate ω of the jth power generation group is calculated using the following formula: j : The total excess revenue ΔR on the power generation side is calculated using the following formula: Where G t is the settlement quantity of the target power market in period t; Finally, the compensation amount ΔR of the jth power generation group is calculated using the following formula: j : ΔR j =μ j ×ΔR×ω j Where μ j is the penalty coefficient of the j-th power generation group.

6. The method for post-market power correction in the electricity spot market according to claim 5, characterized in that The step S5 of calculating the refund amount of each user in the power market according to the settlement method of the target power market specifically includes the following steps: Determine the settlement method of the target power market; the settlement method includes a method of using a unified electricity price for settlement and a method of using a node electricity price for settlement; For the power market that adopts the node electricity price settlement method, the following steps are used to calculate the refund amount for each user in the power market: The following formula is used to calculate the amount refund ratio ω of the kth user in the target power market: k : In the formula is the average time-of-use electricity price at the user side, and P k,t is the electricity price of the kth user in time period t, Q k,t is the electricity consumption of the kth user in time period t, N l is the total number of users, is the average electricity price of the kth user in time period t; Finally, the return amount ΔR of the kth user is calculated using the following formula: k : ΔR k =μ k ×ΔR×ω k Where μ k is the allocation coefficient of the kth user; For the electricity market that adopts the unified electricity price settlement method, the refund amount for each user in the electricity market is calculated according to the proportion of market electricity volume as follows: Calculate the amount refund ratio ω for the kth user k for Finally, the return amount ΔR of the kth user is calculated k ΔR k =μ k ×ΔR×ω k .

7. A system for implementing the post-market power correction method for the electricity spot market as claimed in any one of claims 1 to 6, characterized in that It includes a data acquisition module, a correction and determination module, a re-clearing module, a group compensation module and a user return module; the data acquisition module, the correction and determination module, the re-clearing module, the group compensation module and the user return module are connected in series in sequence; the data acquisition module is used to acquire data information of the target power market and upload the data information to the correction and determination module; The correction determination module is used to determine whether the target power market on that day needs to be corrected after the target power market is cleared according to the received data information, and upload the data information to the re-clearing module; The re-clearing module is used to re-clear the target power market according to the received data information, obtain the clearing electricity price of each node in the target power market in each period after re-clearing, and upload the data information to the group compensation module; The group compensation module is used to calculate the price impact contribution rate of each power generation group based on the received data information, the average electricity price of each power generation group and time-sharing node and the actual average clearing electricity price, and determine the compensation amount of each power generation group, and upload the data information to the user return module; The user return module is used to calculate the return amount for each user in the power market according to the received data information and the settlement method of the target power market, and complete the post-market power correction of the target power spot market.

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