A method and device for identifying economic retention of power grid units

Abstract

The present invention discloses a method and device for identifying economic retention of power grid units, comprising: obtaining all blocked lines according to the result of market clearing calculation of the units; calculating the flow relief demand value of each blocked line in turn, calculating the regulated relief flow of all units corresponding to each blocked line according to the flow relief demand value of each blocked line, calculating the regulated capacity of each unit according to the regulated relief flow and the sensitivity of each unit, and obtaining the regulated capacity set of each unit on all lines; obtaining the maximum regulated capacity in the regulated capacity set, and calculating the economic retention index corresponding to each unit according to the relationship between the maximum regulated capacity and the minimum technical output of the unit; comparing the product of the unit's approved variable cost and the adjustment factor according to the calculation result of the economic retention index, so as to identify the economic retention of each unit, thereby replacing the quotation of the unit identified as economically retained, and re-calculating the market clearing.

Description

Technical Field

[0001] The present invention relates to the field of electric power market-oriented transactions, and in particular to a method and device for identifying economic retention of power grid units. Background Art

[0002] With the advancement of a new round of power market reform, two batches of pilot provinces for the domestic power spot market have entered the long-term settlement trial operation settlement and rule compilation stages respectively. Among them, many pilot provinces adopt the node electricity price mechanism, that is, in the power grid topology modeled by the power market (usually based on 220kV busbar modeling), each grid topology node has its own node electricity price. Under the node electricity price mechanism, when the line is blocked, the node electricity prices at both ends of the line will be different, and the node electricity price of the node at the end of the flow inflow will be higher than the electricity price of the node at the end of the flow outflow. This is the blocking characteristic naturally brought about by the node electricity price mechanism.

[0003] In previous theoretical research and practical experience, the identification of economic retention behavior of units usually adopts the price testing method to judge the unit's quotation in the market. Excessively high quotations are considered to be economic retention behavior, and the market power control means of "quotation replacement" is adopted for the declared capacity segments with excessively high quotations. In the existing economic retention behavior judgment, the unit variable cost (or k times the unit variable cost) is usually used as the threshold for economic retention judgment, and the prices of all declared capacities are compared with the threshold. Those above the threshold are considered to be the exercise of market power by economic retention. However, this traditional price testing method can only allow the unit to have a certain space to raise the quotation and market game by adjusting the parameters in the threshold (such as the parameter k in k times the unit variable cost), but the parameters here are often difficult to measure and give by quantitative means, and can only be given qualitatively and vaguely by the regulatory agency.

[0004] At present, there is an urgent need for a method to identify the economic retention behavior of a unit that can avoid using a single subjective parameter, so as to identify the economic retention behavior reasonably and accurately. Summary of the invention

[0005] The present invention provides a method and device for identifying the economic retention of a power grid unit, so as to solve the technical problem of using a single parameter to identify and monitor the economic retention behavior of a power grid unit in the prior art.

[0006] In order to solve the above technical problems, an embodiment of the present invention provides an economic retention identification method for power grid units, comprising:

[0007] Obtain all blocked lines based on the results of the market clearing calculation of the unit;

[0008] Calculate the power flow relief demand value for each blocked line in turn, and calculate the control relief power flow of all units corresponding to each blocked line according to the power flow relief demand value of each blocked line, and calculate the control capacity of each unit according to the control relief power flow and the sensitivity of each unit, and obtain the control capacity set of each unit on all lines;

[0009] Obtain the maximum regulated capacity in the regulated capacity set, and calculate the economic retention index corresponding to each unit based on the relationship between the maximum regulated capacity and the preset minimum technical output of the unit;

[0010] According to the calculation result of the economic retention index, the product of the preset approved variable cost of each unit and the preset adjustment factor is compared to identify the economic retention of each unit, so as to replace the quotation of the unit identified with economic retention and perform re-market clearing calculation.

[0011] It can be understood that compared with the prior art, the results of the market clearing calculation of the unit are used to calculate the flow relief demand value of each blocked line, and the maximum control capacity is calculated, so as to calculate the economic retention index corresponding to each unit, and then a market power judgment is made for each unit. The units that fail the market power judgment are replaced with quotations and re-market clearing calculations. The present invention calculates the economic retention index through the flow relief demand value of the blocked line, and then performs market power judgment. It can reasonably judge the economic retention behavior through objective factors such as the unit blocking line, and avoid qualitative and vague definitions of existing thresholds.

[0012] As a preferred solution, the calculation of the power flow relief demand value for each blocked line in turn is specifically as follows:

[0013] According to the power flow sensitivity of each unit to each blocked line, the line power flow relief amount of each blocked line is calculated in turn, and according to the preset adjustment margin, the power flow relief demand value of each blocked line is calculated; wherein, the power flow sensitivity of each unit to each blocked line is the unit output power transfer distribution factor, and the adjustment margin is a constant greater than or equal to 1.

[0014] It can be understood that the line flow relief amount of each blocked line is calculated according to the flow sensitivity of each unit to each blocked line, and the flow relief demand value of each blocked line is calculated according to the preset adjustment margin, so as to accurately calculate the control capacity of each subsequent blocked line.

[0015] As a preferred solution, according to the power flow relief demand value of each blocked line, the control relief power flow of all units corresponding to each blocked line is calculated, and the control capacity of each unit is calculated according to the control relief power flow and the sensitivity of each unit, and the control capacity set of each unit on all lines is obtained, which is specifically:

[0016] According to the flow relief demand value of each blocked line and the difference between the installed capacity of each unit and the preset minimum technical output of the unit, the control relief flow of all units corresponding to each blocked line is calculated, and according to the control relief flow of all units corresponding to each blocked line and the flow sensitivity of each unit, the control capacity of each unit for each blocked line is calculated respectively, so that the control capacity is respectively included in the control capacity set of the corresponding unit.

[0017] It can be understood that the control relief flow of each unit is calculated through the flow relief demand value of each blocked line and the difference between the installed capacity of each unit and the preset minimum technical output of the unit, and then the control capacity of each unit for each blocked line can be accurately calculated based on the flow sensitivity of each blocked line.

[0018] As a preferred solution, the maximum regulated capacity in the regulated capacity set is obtained, and the economic retention index corresponding to each unit is calculated according to the relationship between the maximum regulated capacity and the preset minimum technical output of the unit, which is specifically:

[0019] Obtaining the maximum control capacity in the control capacity set of each unit respectively, and determining whether the maximum control capacity corresponding to each unit is less than the preset minimum technical output of the unit;

[0020] If so, the economic retention index of the currently determined unit is calculated based on the output power of the currently determined unit, the preset power market declared price, the maximum control capacity and the preset minimum technical output of the unit;

[0021] If not, the economic retention index of the currently determined unit is set to 0.

[0022] It can be understood that the maximum control capacity is obtained by the control capacity of each unit on each blocked line, and the economic retention index of each unit is calculated by the maximum control capacity, which avoids obtaining the economic retention index through qualitative and fuzzy threshold determination and improves the accuracy and rationality of subsequent economic retention behavior judgment.

[0023] According to the calculation result of the economic retention index, the product of the preset approved variable cost of each unit and the preset adjustment factor is compared to identify the economic retention of each unit, specifically:

[0024] Determine whether the economic retention index corresponding to each unit is greater than the product of the preset approved variable cost of the corresponding unit and the preset adjustment factor; wherein the preset adjustment factor is a constant greater than or equal to 1;

[0025] If so, the unit currently judged has economic retention behavior;

[0026] If not, the unit currently judged does not have any economic retention behavior.

[0027] It can be understood that by judging the product of the preset approved variable cost and the preset adjustment factor of the unit based on the economic retention index, the market power test mark of the unit can be accurately obtained, and the market power of the unit with a market power test mark of 0 is judged as failed, and the market power of the unit with a market power test mark of 1 is judged as passed, so that the economic retention of the unit can be accurately monitored.

[0028] As a preferred solution, the units identified as economically retained are quoted and replaced, and the market clearing calculation is performed again, specifically:

[0029] The preset electricity market declared prices of the units identified as economically held are replaced with the preset approved variable costs of the corresponding units, and the market clearing calculation is re-calculated. The results of the re-market clearing calculation are used for the units identified as economically held, while the results of the original market clearing calculation are used for the units not identified as economically held.

[0030] It can be understood that by replacing the quotations of the units identified as economically retained and thus performing re-market clearing calculations, it is possible to reasonably and accurately re-calculate the market for the units identified as economically retained, avoiding the existing single threshold that is used for qualitative and vague definition, resulting in unreasonable re-market clearing calculations for the units.

[0031] Accordingly, the present invention also provides an economic retention identification device for a power grid unit, comprising: a line acquisition module, a first calculation module, a second calculation module and a market power determination module;

[0032] The line acquisition module is used to acquire all blocked lines according to the results of the market clearing calculation of the unit;

[0033] The first calculation module is used to calculate the power flow relief demand value for each blocked line in turn, and calculate the control relief power flow of all units corresponding to each blocked line according to the power flow relief demand value of each blocked line, and calculate the control capacity of each unit according to the control relief power flow and the sensitivity of each unit, so as to obtain the control capacity set of each unit on all lines;

[0034] The second calculation module is used to obtain the maximum regulated capacity in the regulated capacity set, and calculate the economic retention index corresponding to each unit according to the relationship between the maximum regulated capacity and the preset minimum technical output of the unit;

[0035] The market power identification module is used to compare the product of the preset approved variable cost of each unit and the preset adjustment factor according to the calculation result of the economic retention index, so as to identify the economic retention of each unit, thereby replacing the quotation of the unit identified with economic retention and re-calculating the market clearing.

[0036] As a preferred solution, the first calculation module is used to calculate the power flow relief demand value for each blocked line in turn, and calculate the control relief power flow of all units corresponding to each blocked line according to the power flow relief demand value of each blocked line, and calculate the control capacity of each unit according to the control relief power flow and the sensitivity of each unit, and obtain the control capacity set of each unit on all lines, which is specifically:

[0037] According to the power flow sensitivity of each unit to each blocked line, the line power flow relief amount of each blocked line is calculated in turn, and according to the preset adjustment margin, the power flow relief demand value of each blocked line is calculated; wherein the power flow sensitivity of each unit to each blocked line is the unit output power transfer distribution factor, and the adjustment margin is a constant greater than or equal to 1;

[0038] According to the flow relief demand value of each blocked line and the difference between the installed capacity of each unit and the preset minimum technical output of the unit, the control relief flow of all units corresponding to each blocked line is calculated, and according to the control relief flow of all units corresponding to each blocked line and the flow sensitivity of each unit, the control capacity of each unit for each blocked line is calculated respectively, so that the control capacity is respectively included in the control capacity set of the corresponding unit.

[0039] As a preferred solution, the second calculation module is used to obtain the maximum regulated capacity in the regulated capacity set, and calculate the economic retention index corresponding to each unit according to the relationship between the maximum regulated capacity and the preset minimum technical output of the unit, specifically:

[0040] Obtaining the maximum control capacity in the control capacity set of each unit respectively, and determining whether the maximum control capacity corresponding to each unit is less than the preset minimum technical output of the unit;

[0041] If so, the economic retention index of the currently determined unit is calculated based on the output power of the currently determined unit, the preset power market declared price, the maximum control capacity and the preset minimum technical output of the unit;

[0042] If not, the economic retention index of the currently determined unit is set to 0.

[0043] As a preferred solution, the market power identification module is used to compare the product of the preset approved variable cost of each unit and the preset adjustment factor according to the calculation result of the economic retention index, so as to identify the economic retention of each unit, thereby replacing the quotation of the unit identified as economically retained, and re-calculating the market clearing, specifically as follows:

[0044] Determine whether the economic retention index corresponding to each unit is greater than the product of the preset approved variable cost of the corresponding unit and the preset adjustment factor; wherein the preset adjustment factor is a constant greater than or equal to 1;

[0045] If so, the unit currently judged has economic retention behavior;

[0046] If not, the unit currently judged does not have any economic retention behavior;

[0047] The preset electricity market declared prices of the units identified as economically held are replaced with the preset approved variable costs of the corresponding units, and the market clearing calculation is re-calculated. The results of the re-market clearing calculation are used for the units identified as economically held, while the results of the original market clearing calculation are used for the units not identified as economically held. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 : A schematic diagram of the steps of an economic retention identification method for a power grid unit provided by an embodiment of the present invention;

[0049] Figure 2 : A flow chart of an economic retention identification method for a power grid unit provided by an embodiment of the present invention;

[0050] Figure 3 : A structural schematic diagram of an economic retention identification device for a power grid unit provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0051] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0052] Embodiment 1

[0053] Please refer to Figure 1 , a method for identifying economic retention of power grid units provided by an embodiment of the present invention, comprising the following steps S101-S104:

[0054] S101: Obtain all blocked lines according to the results of the market clearing calculation of the unit.

[0055] It should be noted that, in this embodiment, a complete market clearing is performed based on the quotations of market entities to obtain the results of market clearing calculations; wherein, the results of market clearing calculations include but are not limited to all blocked lines, all line flow information, unit clearing power, and unit flow sensitivity to all lines.

[0056] S102: Calculate the flow relief demand value for each blocked line in turn, and calculate the control relief flow of all units corresponding to each blocked line according to the flow relief demand value of each blocked line, and calculate the control capacity of each unit according to the control relief flow and the sensitivity of each unit to obtain the control capacity set of each unit on all lines.

[0057] Specifically, according to the power flow sensitivity of each unit to each blocked line, the line power flow relief amount of each blocked line is calculated in turn, and according to the preset adjustment margin, the power flow relief demand value of each blocked line is calculated; wherein, the power flow sensitivity of each unit to each blocked line is the unit output power transfer distribution factor, and the adjustment margin is a constant greater than or equal to 1.

[0058] It can be understood that the line flow relief amount of each blocked line is calculated according to the flow sensitivity of each unit to each blocked line, and the flow relief demand value of each blocked line is calculated according to the preset adjustment margin, so as to accurately calculate the control capacity of each subsequent blocked line.

[0059] Specifically, according to the flow relief demand value of each blocked line and the difference between the installed capacity of each unit and the preset minimum technical output of the unit, the control relief flow of all units corresponding to each blocked line is calculated, and according to the control relief flow of all units corresponding to each blocked line and the flow sensitivity of each unit, the control capacity of each unit for each blocked line is calculated respectively, so that the control capacity is respectively included in the control capacity set of the corresponding unit.

[0060] It can be understood that the control relief flow of each unit is calculated through the flow relief demand value of each blocked line and the difference between the installed capacity of each unit and the preset minimum technical output of the unit, and then the control capacity of each unit for each blocked line can be accurately calculated based on the flow sensitivity of each blocked line.

[0061] In this embodiment, for the blocked line l, the line power flow relief amount is the part of the power flow brought by the unit output to the line that is opposite to the line blocking direction, which is calculated as follows:

[0062]

[0063] Among them, Q i is the clearing output of unit i, g i,l is the power flow sensitivity of unit i to line l, I l It is the set of units whose sensitivity to line power flow is less than 0.

[0064] Then the power flow relief demand value of the blocked line l is:

[0065] D l =k flow ·F l

[0066] Among them, k flow The adjustment margin set for the power flow relief of the blocked line is a constant greater than or equal to 1.

[0067] For unit set I l For each unit in the control relief flow, the control relief flow is calculated for line l. The control relief flow of unit i is:

[0068]

[0069] Among them, C i It represents the difference between the installed capacity of unit i and its minimum technical output, D l is the power flow relief demand value of the blocked line l.

[0070] Mitigation of power flow according to the control of the unit i,l , the control capacity of the computer group:

[0071]

[0072] Among them, g i,l is the power flow sensitivity of unit i to blocked line l.

[0073] The calculated control capacity c of unit i on line l is i,l The control capacity set Ω of unit i is included i Traverse all blocked lines until each unit obtains its own control capacity set Ω i .

[0074] S103: Obtain the maximum regulated capacity in the regulated capacity set, and calculate the economic retention index corresponding to each unit according to the relationship between the maximum regulated capacity and the preset minimum technical output of the unit.

[0075] Specifically, the maximum regulated capacity in the regulated capacity set of each unit is obtained respectively, and it is determined whether the maximum regulated capacity corresponding to each unit is less than the preset minimum technical output of the unit; if so, the economic retention index of the currently judged unit is calculated according to the output power of the currently judged unit, the preset electricity market declared price, the maximum regulated capacity and the preset minimum technical output of the unit; if not, the economic retention index of the currently judged unit is set to 0.

[0076] Calculate the maximum control capacity for each unit. Then the maximum control capacity of unit i is, the control capacity set Ω in step 4 i The maximum value in , that is:

[0077] c i,max =max{c i,l |c i,l ∈Ω i}

[0078] Among them, c i is the output power of unit i; p(c i ) is the unit's electricity market price, which is the same as c i The relevant quotation function can be a linear function or a step function, which is determined by market rules.

[0079] If the minimum technical output of unit i is c i,tech Greater than or equal to the maximum control capacity c of unit i i,max , then: P i =0.

[0080] It can be understood that the maximum control capacity is obtained by the control capacity of each unit on each blocked line, and the economic retention index of each unit is calculated by the maximum control capacity, which avoids obtaining the economic retention index through qualitative and fuzzy threshold determination and improves the accuracy and rationality of subsequent economic retention behavior judgment.

[0081] S104: Based on the calculation result of the economic retention index, the product of the preset approved variable cost of each unit and the preset adjustment factor is compared to identify the economic retention of each unit, thereby replacing the quotation of the economically retained unit and re-calculating the market clearing.

[0082] Specifically, determine whether the economic retention index corresponding to each unit is greater than the product of the preset approved variable cost of the corresponding unit and the preset adjustment factor; wherein the preset adjustment factor is a constant greater than or equal to 1; if so, the unit currently being judged has economic retention behavior; if not, the unit currently being judged does not have economic retention behavior.

[0083] In this embodiment, economic retention identification is performed based on the economic retention index:

[0084]

[0085] In the formula, σ i is the market power test flag of unit i, when it is 1, it means that the economic retention behavior is not identified, and when it is 0, it means that the economic retention behavior is identified; P i,cost is the approved variable cost of unit i; k cost It is the unit's allowable income adjustment factor, which is a constant greater than or equal to 1.

[0086] It can be understood that by judging the product of the preset approved variable cost and the preset adjustment factor of the unit based on the economic retention index, the market power test mark of the unit can be accurately obtained, and the market power of the unit with a market power test mark of 0 is judged as failed, and the market power of the unit with a market power test mark of 1 is judged as passed, so that the economic retention of the unit can be accurately monitored.

[0087] Specifically, the preset electricity market declared price of the units identified as economically held is replaced with the preset approved variable cost of the corresponding units, and the market clearing calculation is re-performed. The result of the re-market clearing calculation is used for the units identified as economically held, while the result of the original market clearing calculation is used for the units not identified as economically held.

[0088] In this embodiment, for the market power test indicator σ i The unit with a minimum technical output c is 0. i,tech Above, the maximum control capacity c i,max The following markets report p(c i ), replace the quotation with the approved variable cost P i,cost , and then re-cleared as the final market clearing result.

[0089] It can be understood that by replacing the quotations of the units identified as economically retained and thus performing re-market clearing calculations, it is possible to reasonably and accurately re-calculate the market for the units identified as economically retained, avoiding the existing single threshold that is used for qualitative and vague definition, resulting in unreasonable re-market clearing calculations for the units.

[0090] See also Figure 2, which is a flow chart of economic retention identification of power grid units in this embodiment. First, a complete market clearing is performed according to the quotations of market entities, and a blocking line is selected to calculate the flow relief demand value and the unit control capacity set, and then after traversing all the blocking lines, the maximum control capacity in the control capacity set corresponding to each unit is extracted, and the economic retention index is calculated, so that each unit can perform high-accuracy identification of economic retention behavior according to the economic retention index, and the quotation of the unit identified with economic retention behavior is replaced and re-cleared.

[0091] Implementing the above embodiments has the following effects:

[0092] Compared with the prior art, the embodiments of the present invention calculate the flow relief demand value of each blocked line through the result of the market clearing calculation of the unit, and calculate the maximum control capacity, so as to calculate the economic retention index corresponding to each unit, and then perform market power judgment on each unit, replace the quotation of the unit that fails the market power judgment and perform market clearing calculation again. The present invention calculates the economic retention index through the flow relief demand value of the blocked line, and then performs market power judgment. It can reasonably judge the economic retention behavior through objective factors such as the unit blocking line, and avoid qualitative and vague definition of the existing single threshold parameter.

[0093] Embodiment 2

[0094] Correspondingly, an embodiment of the present invention further provides an economic retention identification device for power grid units, comprising: a line acquisition module 201 , a first calculation module 202 , a second calculation module 203 and a market power determination module 204 .

[0095] The line acquisition module 201 is used to acquire all blocked lines according to the results of the market clearing calculation of the unit.

[0096] The first calculation module 202 is used to calculate the flow relief demand value for each blocked line in turn, and calculate the control relief flow of all units corresponding to each blocked line according to the flow relief demand value of each blocked line, and calculate the control capacity of each unit according to the control relief flow and the sensitivity of each unit to obtain the control capacity set of each unit on all lines.

[0097] The second calculation module 203 is used to obtain the maximum regulated capacity in the regulated capacity set, and calculate the economic retention index corresponding to each unit according to the relationship between the maximum regulated capacity and the preset minimum technical output of the unit.

[0098] The market power identification module 204 is used to compare the product of the preset approved variable cost of each unit and the preset adjustment factor according to the calculation result of the economic retention index, so as to identify the economic retention of each unit, thereby replacing the quotation of the unit identified as economically retained and re-calculating the market clearing.

[0099] As a preferred solution, the first calculation module 202 is used to calculate the power flow relief demand value for each blocked line, and calculate the control relief power flow of all units corresponding to each blocked line according to the power flow relief demand value of each blocked line, and calculate the control capacity of each unit according to the control relief power flow and the sensitivity of each unit, and obtain the control capacity set of each unit on all lines, which is specifically:

[0100] According to the power flow sensitivity of each unit to each blocked line, the line power flow relief amount of each blocked line is calculated in turn, and according to the preset adjustment margin, the power flow relief demand value of each blocked line is calculated; wherein, the power flow sensitivity of each unit to each blocked line is the unit output power transfer distribution factor, and the adjustment margin is a constant greater than or equal to 1; according to the power flow relief demand value of each blocked line, and the difference between the installed capacity of each unit and the preset minimum technical output of the unit, the control relief power of all units corresponding to each blocked line is calculated, and according to the control relief power of all units corresponding to each blocked line and the power flow sensitivity of each unit, the control capacity of each unit to each blocked line is calculated respectively, so that the control capacity is respectively included in the control capacity set of the corresponding unit.

[0101] As a preferred solution, the second calculation module 203 is used to obtain the maximum regulated capacity in the regulated capacity set, and calculate the economic retention index corresponding to each unit according to the relationship between the maximum regulated capacity and the preset minimum technical output of the unit, specifically:

[0102] The maximum regulated capacity in the regulated capacity set of each unit is obtained respectively, and it is determined whether the maximum regulated capacity corresponding to each unit is less than the preset minimum technical output of the unit; if so, the economic retention index of the currently judged unit is calculated according to the output power of the currently judged unit, the preset electricity market declared price, the maximum regulated capacity and the preset minimum technical output of the unit; if not, the economic retention index of the currently judged unit is set to 0.

[0103] As a preferred solution, the market power identification module 204 is used to compare the product of the preset approved variable cost of each unit and the preset adjustment factor according to the calculation result of the economic retention index, so as to identify the economic retention of each unit, thereby replacing the quotation of the unit identified as economically retained, and re-calculating the market clearing, specifically as follows:

[0104] Determine whether the economic retention index corresponding to each unit is greater than the product of the preset approved variable cost of the corresponding unit and the preset adjustment factor; wherein the preset adjustment factor is a constant greater than or equal to 1; if so, the unit currently judged has economic retention behavior; if not, the unit currently judged does not have economic retention behavior; replace the preset electricity market declared price of the unit identified with economic retention with the preset approved variable cost of the corresponding unit, perform a re-market clearing calculation, and use the result of the re-market clearing calculation for the unit identified with economic retention, while use the result of the original market clearing calculation for the unit not identified with economic retention.

[0105] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the device described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0106] Implementing the above embodiments has the following effects:

[0107] The embodiment of the present invention can calculate the flow relief demand value of each blocked line through the result of the market clearing calculation of the unit, and calculate the maximum control capacity, so as to calculate the economic retention index corresponding to each unit, and then make a market power judgment on each unit, replace the quotation of the unit that fails the market power judgment and re-calculate the market clearing. The present invention calculates the economic retention index through the flow relief demand value of the blocked line, and then makes a market power judgment. It can reasonably judge the economic retention behavior through objective factors such as the unit's blocked line, control capacity and economic retention index, and avoid qualitative and vague definition of the existing single threshold parameter.

[0108] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. It is particularly pointed out that for those skilled in the art, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for identifying economic retention of power grid units, characterized in that: include: Obtain all blocked lines based on the results of the market clearing calculation of the units; Calculate the power flow relief demand value for each blocked line in turn, calculate the control relief power flow of all units corresponding to each blocked line according to the power flow relief demand value of each blocked line and the difference between the installed capacity of each unit and the preset minimum technical output of the unit, and calculate the control capacity of each unit for each blocked line according to the control relief power flow of all units corresponding to each blocked line and the power flow sensitivity of each unit, so as to include the control capacity into the control capacity set of the corresponding unit respectively; Obtain the maximum regulated capacity in the regulated capacity set, and calculate the economic retention index corresponding to each unit based on the relationship between the maximum regulated capacity and the preset minimum technical output of the unit; According to the calculation result of the economic retention index, the product of the preset approved variable cost of each unit and the preset adjustment factor is compared to identify the economic retention of each unit, thereby replacing the quotation of the unit identified as economically retained and re-calculating the market clearing; Among them, for the blocked line l, the line flow relief amount is: the part of the flow brought by the unit output to the line that is opposite to the line blocking direction, calculated as follows: In the formula, Q i is the clearing output of unit i, g i,l is the power flow sensitivity of unit i to line l, I l is the set of units whose sensitivity to line l power flow is less than 0; The power flow relief demand value of the blocked line l is: D l =k flow ·F l In the formula, k flow The adjustment margin set for the power flow relief of the blocked line is a constant greater than or equal to 1; For unit set I l For the units in the control relief flow, the control relief flow is calculated for line l respectively; the control relief flow of unit i is: In the formula, C i It represents the difference between the installed capacity of unit i and its minimum technical output, D l is the power flow relief demand value of the blocked line l; Mitigation of power flow according to the control of the unit i,l , the control capacity of the computer group: In the formula, g i,l is the power flow sensitivity of unit i to the blocked line l; The calculated control capacity c of unit i on line l is i,l The control capacity set Ω of unit i is included i ; Traverse all blocked lines until each unit obtains its own control capacity set Ω i .

2. The method for identifying economic retention of power grid units according to claim 1, characterized in that: The calculation of the power flow relief demand value for each blocked line in turn is specifically as follows: According to the power flow sensitivity of each unit to each blocked line, the line power flow relief amount of each blocked line is calculated in turn, and according to the preset adjustment margin, the power flow relief demand value of each blocked line is calculated; wherein, the power flow sensitivity of each unit to each blocked line is the unit output power transfer distribution factor, and the adjustment margin is a constant greater than or equal to 1.

3. The method for identifying economic retention of power grid units according to claim 1, characterized in that: The maximum regulated capacity in the regulated capacity set is obtained, and the economic retention index corresponding to each unit is calculated according to the relationship between the maximum regulated capacity and the preset minimum technical output of the unit, which is specifically: Obtaining the maximum control capacity in the control capacity set of each unit respectively, and determining whether the maximum control capacity corresponding to each unit is less than the preset minimum technical output of the unit; If so, the economic retention index of the currently determined unit is calculated based on the output power of the currently determined unit, the preset power market declared price, the maximum control capacity and the preset minimum technical output of the unit; If not, the economic retention index of the currently determined unit is set to 0.

4. The method for identifying economic retention of power grid units according to claim 3, characterized in that: According to the calculation result of the economic retention index, the product of the preset approved variable cost of each unit and the preset adjustment factor is compared to identify the economic retention of each unit, specifically: Determine whether the economic retention index corresponding to each unit is greater than the product of the preset approved variable cost of the corresponding unit and the preset adjustment factor; wherein the preset adjustment factor is a constant greater than or equal to 1; If so, the unit currently judged has economic retention behavior; If not, the unit currently judged does not have any economic retention behavior.

5. The method for identifying economic retention of power grid units according to claim 4, characterized in that: The above-mentioned process of replacing the quotation of the units identified as economically retained and re-calculating the market clearing is as follows: The preset electricity market declared prices of the units identified as economically held are replaced with the preset approved variable costs of the corresponding units, and the market clearing calculation is re-calculated. The results of the re-market clearing calculation are used for the units identified as economically held, while the results of the original market clearing calculation are used for the units not identified as economically held.

6. An economic retention identification device for a power grid unit, characterized in that: include: A line acquisition module, a first calculation module, a second calculation module and a market power determination module; The line acquisition module is used to acquire all blocked lines according to the results of the market clearing calculation of the unit; The first calculation module is used to calculate the power flow relief demand value for each blocked line in turn, calculate the control relief power flow of all units corresponding to each blocked line according to the power flow relief demand value of each blocked line and the difference between the installed capacity of each unit and the preset minimum technical output of the unit, and calculate the control capacity of each unit for each blocked line according to the control relief power flow of all units corresponding to each blocked line and the power flow sensitivity of each unit, so as to respectively include the control capacity into the control capacity set of the corresponding unit; The second calculation module is used to obtain the maximum regulated capacity in the regulated capacity set, and calculate the economic retention index corresponding to each unit according to the relationship between the maximum regulated capacity and the preset minimum technical output of the unit; The market power identification module is used to compare the product of the preset approved variable cost of each unit and the preset adjustment factor according to the calculation result of the economic retention index, so as to identify the economic retention of each unit, thereby replacing the quotation of the unit identified as economically retained and performing re-market clearing calculation; Among them, for the blocked line l, the line flow relief amount is: the part of the flow brought by the unit output to the line that is opposite to the line blocking direction, calculated as follows: In the formula, Q i is the clearing output of unit i, g i,l is the power flow sensitivity of unit i to line l, I l is the set of units whose sensitivity to line l power flow is less than 0; The power flow relief demand value of the blocked line l is: D l =k flow ·F l In the formula, k flow The adjustment margin set for the power flow relief of the blocked line is a constant greater than or equal to 1; For unit set I l For the units in the control relief flow, the control relief flow is calculated for line l respectively; the control relief flow of unit i is: In the formula, C i It represents the difference between the installed capacity of unit i and its minimum technical output, D l is the power flow relief demand value of the blocked line l; Mitigation of power flow according to the control of the unit i,l , the control capacity of the computer group: In the formula, g i,l is the power flow sensitivity of unit i to the blocked line l; The calculated control capacity c of unit i on line l is i,l The control capacity set Ω of unit i is included i ; Traverse all blocked lines until each unit obtains its own control capacity set Ω i .

7. The economic retention identification device of a power grid unit according to claim 6, characterized in that: The first calculation module is used to calculate the power flow relief demand value of each blocked line in turn, and calculate the control relief power flow of all units corresponding to each blocked line according to the power flow relief demand value of each blocked line, and calculate the control capacity of each unit according to the control relief power flow and the sensitivity of each unit, and obtain the control capacity set of each unit on all lines, which is specifically: According to the power flow sensitivity of each unit to each blocked line, the line power flow relief amount of each blocked line is calculated in turn, and according to the preset adjustment margin, the power flow relief demand value of each blocked line is calculated; wherein, the power flow sensitivity of each unit to each blocked line is the unit output power transfer distribution factor, and the adjustment margin is a constant greater than or equal to 1.

8. The economic retention identification device of a power grid unit according to claim 6, characterized in that: The second calculation module is used to obtain the maximum regulated capacity in the regulated capacity set, and calculate the economic retention index corresponding to each unit according to the relationship between the maximum regulated capacity and the preset minimum technical output of the unit, specifically: Obtaining the maximum control capacity in the control capacity set of each unit respectively, and determining whether the maximum control capacity corresponding to each unit is less than the preset minimum technical output of the unit; If so, the economic retention index of the currently determined unit is calculated based on the output power of the currently determined unit, the preset power market declared price, the maximum control capacity and the preset minimum technical output of the unit; If not, the economic retention index of the currently determined unit is set to 0.

9. The economic retention identification device of a power grid unit according to claim 8, characterized in that: The market power identification module is used to compare the product of the preset approved variable cost of each unit and the preset adjustment factor according to the calculation result of the economic retention index, so as to identify the economic retention of each unit, thereby replacing the quotation of the unit identified as economically retained, and re-market clearing calculation, specifically as follows: Determine whether the economic retention index corresponding to each unit is greater than the product of the preset approved variable cost of the corresponding unit and the preset adjustment factor; wherein the preset adjustment factor is a constant greater than or equal to 1; If so, the unit currently judged has economic retention behavior; If not, the unit currently judged does not have any economic retention behavior; The preset electricity market declared prices of the units identified as economically held are replaced with the preset approved variable costs of the corresponding units, and the market clearing calculation is re-calculated. The results of the re-market clearing calculation are used for the units identified as economically held, while the results of the original market clearing calculation are used for the units not identified as economically held.

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