A load regulation method for a power system and related devices

Abstract

The embodiment of the application discloses a load regulation method of a power system and related equipment, relates to the technical field of power systems, and realizes flexible selection of a cut-off strategy according to the power difference value between the remaining active capacity of a standby transformer and the active power of a fault transformer. When the power difference value is a non-positive number, only the target power out line, in which the out line power cumulative value covers the power difference value, needs to be cut off, the risk of false cutting is reduced, the standby transformer is prevented from being overloaded, and resource waste is avoided. When the difference value is a positive number, cutting is not needed, the load of the power system is maximally reserved, and the power system is ensured to operate within a safe capacity range.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power systems, and in particular to a load regulation method for a power system and related equipment. BACKGROUND

[0002] In the current power system, the transformer as the core power supply equipment, its failure will cause the load power supply interruption, seriously affect the stability of the power grid. The traditional solution usually uses the power flow automatic transfer to automatically put the standby transformer into operation, that is, to maintain the load power supply by the remaining active capacity of the standby transformer, but this method does not consider the power out-line matching problem of the standby transformer and the fault transformer and the transformer overload problem caused by the power flow transfer. The matching problem may cause the standby transformer to be unable to bear all the load due to the out-line incompatibility, resulting in resource waste; and the standby transformer overload exit will cause the system failure to expand, endangering the safety of the power system. SUMMARY

[0003] Therefore, the present application provides a load regulation method for a power system and related equipment.

[0004] The specific technical scheme of the first embodiment of the present application is: a load regulation method for a power system, applied to a power system, the power system comprising a plurality of transformers, each transformer being provided with at least one power out-line, the power out-line being used to supply power to the load, the method comprising: when a first transformer in the power system fails, obtaining a standby transformer of the first transformer from candidate transformers in the power system that have not failed; the standby transformer being a transformer having the same power out-line as the first transformer; obtaining the remaining active capacity of the standby transformer and the active power of the first transformer; calculating a power difference value according to the remaining active capacity and the active power; when the power difference value is a non-positive number, performing target power out-line screening in the intersection of the power out-line of the standby transformer and the power out-line of the first transformer, and cutting off the target power out-line; the cumulative value of the out-line power of the target power out-line being greater than the power difference value; when the power difference value is a positive number, the power system does not cut off the power out-line.

[0005] Preferably, the target power out-line screening in the intersection of the power out-line of the standby transformer and the power out-line of the first transformer comprises: screening the target power out-line in the intersection of the power out-line of the standby transformer and the power out-line of the first transformer, with the cumulative value being greater than the power difference value and the cumulative value being the smallest as the target.

[0006] Preferably, the screening of the target power outlet in the intersection of the power outlet of the standby transformer and the power outlet of the first transformer comprises: screening the target power outlet in the intersection of the power outlet of the standby transformer and the power outlet of the first transformer in order to minimize the total load economic loss value in unit time with the accumulated value being greater than the power difference value.

[0007] Preferably, the total load economic loss value in unit time is obtained by using the following formula:

[0008]

[0009] wherein, the total load economic loss value in unit time is, a preset industry adjustment factor, the industry carried by the power outlet, i the power value size, the total value of the industry in the region where the power system is located, i the total power consumption of the industry in the region where the power system is located. i

[0010] Preferably, the remaining active capacity is obtained according to the maximum rated capacity of the standby transformer, the active power of the power outlet, and the number of power outlets of the standby transformer.

[0011] Preferably, the remaining active capacity is obtained by using the following formula:

[0012]

[0013] wherein, the remaining active capacity is, the total maximum rated capacity of the standby transformer, the active power transmitted by the i-th power outlet, i the power factor of the line transmission, the number of power outlets of the standby transformer, a preset power factor requirement. Preferably, the method further comprises: when there is no standby transformer of the first transformer in the power system, cutting off all the second power outlets corresponding to the first transformer.

[0014]

[0015] ​​​The specific technical scheme of the second embodiment of the present application is: a load regulation system of a power system, the system comprising: a standby transformer acquisition module, a parameter acquisition module, a power difference calculation module, a first removal module and a second removal module; the standby transformer acquisition module is used to acquire a standby transformer of a first transformer in the power system when the first transformer fails; the standby transformer is a transformer with the same power outgoing line as the first transformer; the parameter acquisition module is used to acquire the remaining active capacity of the standby transformer and the active power of the first transformer; the power difference calculation module is used to calculate a power difference according to the remaining active capacity and the active power; the first removal module is used to select a target power outgoing line in the intersection of the power outgoing line of the standby transformer and the power outgoing line of the first transformer when the power difference is a non-positive number, and remove the target power outgoing line; the cumulative value of the outgoing line power of the target power outgoing line is greater than the power difference; the second removal module is used to not remove the power outgoing line of the power system when the power difference is a positive number.

[0016] The specific technical scheme of the third embodiment of the present application is: a load regulation device of a power system, comprising a memory and a processor, the memory storing a computer program, and the computer program being executed by the processor to make the processor execute the steps of the method according to any one of the first embodiment of the present application.

[0017] The specific technical scheme of the fourth embodiment of the present application is: a computer readable storage medium storing a computer program, and the computer program being executed by a processor to make the processor execute the steps of the method according to any one of the first embodiment of the present application.

[0018] The embodiments of the present application have the following beneficial effects:

[0019] The present application realizes flexible selection of removal strategy according to the power difference between the remaining active capacity of the standby transformer and the active power of the failed transformer, when the power difference is a non-positive number, only the target power outgoing line whose cumulative value of outgoing line power covers the power difference needs to be removed, reducing the risk of misremoval, preventing the standby transformer from being overloaded, and avoiding resource waste; when the difference is positive, no removal is needed, the load of the power system is maximized, and the power system is ensured to run within the safe capacity range. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the accompanying drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced. Obviously, the accompanying drawings in the following description only only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of these drawings.

[0021] Figure 1 Step flow chart for the first embodiment of the load regulation method of the power system

[0022] Figure 2 Step flow chart for the second embodiment of the load regulation method of the power system

[0023] Figure 3 Electrical wiring structure diagram of the substation

[0024] Figure 4 Structure schematic diagram of the load regulation system of the power system

[0025] Among them, 401, standby transformer acquisition module; 402, parameter acquisition module; 403, power difference calculation module; 404, first removal module; 405, second removal module. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0027] The terms "first", "second", etc. in the specification and claims of the present application and the accompanying drawings are used to distinguish different objects, not to describe a specific order. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or modules is not limited to the listed steps or modules, but can optionally include steps or modules not listed, or can optionally include other steps or modules inherent to the process, method, product or device.

[0028] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0029] Please see Figure 1 This is a flowchart illustrating the steps of a load regulation method for a power system according to the first embodiment of this application. The method is applied to a power system comprising multiple transformers, each transformer having at least one power output line used to supply power to loads. The method includes:

[0030] Step 101: When the first transformer in the power system fails, a backup transformer for the first transformer is obtained from the candidate transformers in the power system that have not failed; the backup transformer is a transformer with the same power output as the first transformer.

[0031] Step 102: Obtain the remaining active power capacity Δ of the standby transformer. P s and obtain the active power of the first transformer. P d ;

[0032] Step 103: Based on the remaining active power capacity Δ P s and the active power P d Calculate the power difference Δ P ;

[0033] Step 104: When the power difference Δ P When the value is non-positive, the target power output is screened at the intersection of the power output of the standby transformer and the power output of the first transformer, and the target power output is cut off; the cumulative value of the output power of the target power output is greater than the power difference Δ. P ;

[0034] Step 105: When the power difference Δ P When the value is positive, the power system does not disconnect the power output line.

[0035] Specifically, in the operation process of the power system, the transformer fault can seriously affect the stability and reliability of the system. When the first transformer in the power system fails, in order to ensure the continuity of power supply, a suitable standby transformer needs to be found among the candidate transformers that have not failed in the system. The selection standard of the standby transformer is the transformer with the same power outgoing line as the first transformer, so as to ensure that it can replace the first transformer to undertake the corresponding power supply task. After determining the standby transformer, the remaining active capacity of the standby transformer needs to be obtained, and the active power of the first transformer is also obtained. The remaining active capacity reflects the additional power load that the standby transformer can undertake in the current state, and the active power is the power output by the first transformer when it is working normally. According to the obtained remaining active capacity and active power, the power difference between the two is calculated. When the calculated power difference is a non-positive number, it means that the remaining active capacity of the standby transformer is insufficient to completely undertake the active power of the first transformer. At this time, the selection of the target power outgoing line needs to be carried out in the intersection of the power outgoing lines of the standby transformer and the power outgoing lines of the first transformer. The principle of selection is to select the outgoing line whose cumulative value of outgoing power is greater than the power difference, and to cut off these target power outgoing lines to ensure that the standby transformer can operate safely and stably. When the power difference is positive, it means that the remaining active capacity of the standby transformer is sufficient to undertake the active power of the first transformer, and at this time the power system does not need to carry out the cutting operation of the power outgoing line, and can maintain the existing power supply state.

[0036] The method in the embodiment realizes flexible selection of cutting strategy according to the power difference between the remaining active capacity of the standby transformer and the active power of the fault transformer. When the power difference is a non-positive number, only the target power outgoing line whose cumulative value of outgoing power covers the power difference needs to be cut off, which reduces the risk of false cutting, prevents the overload of the standby transformer, and avoids wasting resources. When the difference is positive, no cutting is needed, which maximizes the load of the power system and ensures that the power system operates within the safe capacity range.

[0037] In specific embodiments, the selection of the target power outgoing line in the intersection of the power outgoing lines of the standby transformer and the power outgoing lines of the first transformer includes: selecting the target power outgoing line with the cumulative value greater than the power difference ΔP P and the minimum cumulative value as the target, and selecting the target power outgoing line in the intersection of the power outgoing lines of the standby transformer and the power outgoing lines of the first transformer.

[0038] Specifically, the selection is targeted at the cumulative value being greater than the power difference value and the cumulative value being the minimum, that is, from a plurality of power outlet combinations, a power outlet combination is found, in which the cumulative value of the power outlet power just exceeds the power difference value, and the cumulative value is the minimum among all combinations meeting the condition, so as to serve as the target power outlet, which can not only ensure that the standby transformer has sufficient capacity to bear the remaining load after part of the power outlet is cut off, but also can minimize the impact on power supply and avoid unnecessary reduction of power supply capacity caused by excessive cutting of the power outlet.

[0039] In specific embodiments, the selection of the target power outlet in the intersection of the power outlets of the standby transformer and the power outlets of the first transformer comprises: targeting at the cumulative value being greater than the power difference value Δ P and the cumulative value being the minimum in the total load economic loss value per unit time, the selection of the target power outlet in the intersection of the power outlets of the standby transformer and the power outlets of the first transformer is performed.

[0040] Specifically, after the standby transformer is determined, the remaining active capacity of the standby transformer and the active power of the first transformer are obtained, and then the power difference value Δ P is calculated. P When Δ P is a non-positive number, the remaining capacity of the standby transformer is insufficient to bear the entire power of the first transformer, which requires the selection of the target power outlet in the intersection of the power outlets of the standby transformer and the power outlets of the first transformer. The selection of the target power outlet is not random, but is targeted at the cumulative value being greater than the power difference value Δ P and the cumulative value being the minimum in the total load economic loss value per unit time. Different power outlets in the power system correspond to loads with different economic values. Some power outlets bear power supply for high-value-added industries, and some bear ordinary loads. In the selection process, these factors are considered comprehensively, and through accurate calculation and analysis, a power outlet combination is found, which can meet the capacity requirement of the standby transformer and minimize the economic loss.

[0041] The total load economic loss value per unit time is obtained by the following formula:

[0042]

[0043] wherein, is the total load economic loss value per unit time, is a preset industry adjustment factor, is the power value of the industry i carried by the power outlet, is the total value of the industry i in the region where the power system is located, is the total power consumption of the industry i in the region where the power system is located.

[0044] Specifically, by comprehensively considering the power value of the industry carried by the power outgoing line , the gross domestic product of the industry in the region where the power system is located , and the total power consumption and other key factors, the economic loss caused by the removal or adjustment of the power outgoing line during load regulation can be accurately quantified, which enables the operator of the power system to clearly understand the economic impact of each load regulation operation, providing accurate data support for decision-making. The industry regulation factor in the formula can be set according to the importance and sensitivity of different industries. For some key industries such as medical care and communication, a higher industry regulation factor can be set to minimize the impact on the power supply of these industries during load regulation; while for industries with higher tolerance to power interruption, a relatively lower regulation factor can be set. In this way, when selecting the target power outgoing line, the regulation priority can be reasonably set according to the size of the economic loss, and the power consumption of industries with high economic impact and importance is prioritized. Selecting the target power outgoing line at the intersection of the standby transformer and the first transformer power outgoing line based on the economic loss value calculated by the formula can make the load regulation strategy more scientific and reasonable. It not only considers the capacity limit of the power system, but also takes into account economic factors, thereby minimizing economic losses while ensuring stable operation of the power system.

[0045] In specific embodiments, the remaining active capacity Δ P s .

[0046] Specifically, the maximum active capacity of the standby transformer is a key parameter, which represents the maximum power that the transformer can output in an ideal state. The preset rated capacity of the power outgoing line reflects the maximum power allowed to pass through each outgoing line. Different power outgoing lines have different preset active powers according to their purposes and connected loads, and the number of power outgoing lines of the standby transformer determines how many lines the transformer can supply power to at the same time. When calculating the remaining active capacity, the above three factors need to be considered comprehensively.

[0047] In specific embodiments, the remaining active capacity Δ P s is obtained using the following formula:

[0048]

[0049] wherein, is the remaining active capacity, total maximum rated capacity of the backup transformer, the number of power outgoing lines of the backup transformer, i active power transmitted by the power outgoing lines, power factor of the line transmission, the number of power outgoing lines of the backup transformer, preset power factor requirement.

[0050] Specifically, through the calculated remaining active capacity, it can be determined how much load the backup transformer can still provide power support for, so that in the case of first transformer failure, etc., it can be scientifically judged whether load adjustment needs to be made by cutting off part of the power outgoing line, etc., to ensure the stable operation of the power system.

[0051] In specific embodiments, the method further comprises: when there is no backup transformer of the first transformer in the power system, cutting off all second power outgoing lines corresponding to the first transformer. Specifically, in the operation process of the power system, transformer failure is a possible sudden condition, and when the first transformer fails, the system needs to respond quickly to ensure the stability and safety of the whole. According to the established load adjustment scheme, first, the backup transformer with the same power outgoing line as the first transformer will be found among the candidate transformers that have not failed in the power system. The purpose of this step is to use existing resources in the system as much as possible to take over the load of the first transformer through the backup transformer to maintain the continuity of power supply. However, in the actual operation of the power system, there may be a situation where there is no backup transformer of the first transformer in the system. At this time, since there is no suitable backup transformer to take over the power supply task of the first transformer, in order to ensure the stable operation of the power system and avoid further expansion of the failure, more decisive measures need to be taken. Specifically, when it is confirmed that there is no backup transformer, all second power outgoing lines corresponding to the first transformer are cut off. Cutting off these power outgoing lines will affect power supply to some extent, but this is a necessary means to ensure the safety of the power system under the current circumstances. By cutting off the relevant outgoing lines in time, it can prevent the chain reaction caused by the failure of the first transformer and protect the normal operation of other devices in the system.

[0052] Specifically, please refer to Figure 2 The specific steps of the method are:

[0053] S201, according to the data and electrical connection relationship of each device in the substation in engineering practice, referring to the case data structure in Matpower, and through the preset node, the information of each power device (including the active power P d , reactive power Q d and capacity constraints of each device are obtained. d dP max 、 P min 、 Q max 、 Q min The connection relationship is recorded by a data table.

[0054] S202, load data is collected and summarized from the load end of the 10kV outgoing line to the target substation side, and the power load categories of each outgoing line under the target substation and the proportion of different categories are summarized. Due to the special factors of primary load and livelihood load, the outgoing line with the load is specially marked, and the rest of the outgoing line is calculated by the industry power generation ratio to calculate the economic index of the power of each outgoing line per unit time.

[0055] S203, the method studies the quantitative evaluation of the loss of power equipment at the system level under sudden disasters, so it is necessary to preset the power equipment to exit. Based on the actual engineering environment of the substation, the devices for research mainly include three types of power incoming line, power transformer and power outgoing line, and the incoming power is equivalent to the generator output, and the outgoing power is equivalent to the load.

[0056] S204, determine the active power originally transmitted by the power equipment under study P d , the system active power transmission shortage caused by the exit of the fault transformer is Δ P d = P d .

[0057] S205, according to the system electrical wiring relationship, confirm whether the fault equipment contains a standby transformer. It is worth mentioning that the standby transformer in this method refers to a device with the same function, when one party exits, the other party can assume part or all of the power shortage caused by its exit. Specifically, multiple power incoming lines connected to the same bus, multiple power transformers connected to the same bus in the substation, and multiple power outgoing lines to the same downstream substation or downstream area can be regarded as standby transformers. If it does not contain a standby transformer, proceed to S209; if it contains a standby transformer, continue to S206.

[0058] S206, according to the rated capacity constraint of the standby transformer, calculate the remaining active capacity Δ P s of the standby transformer based on meeting the reactive power requirements of each device in the system.

[0059] S207, calculate the system active power transmission shortage Δ Pd and the remaining active capacity Δ P s the difference Δ P = Δ P s - Δ P d and the difference is determined. If Δ P > 0, S210 is performed; if Δ P < 0, S208 is continued.

[0060] S08, if the output line is the fault equipment, in order to prevent the backup line from being overloaded, and considering that the algorithm only performs regulation and calculation within a single substation, when the backup line capacity of the output line is insufficient, the entire fault line is cut off, i.e., Δ P Loss = Δ P d , and the economic loss is the line's C dl If it is not the output line fault, firstly, the load level carried by the output line is determined, and for the output line carrying primary load or livelihood load, it is not considered in the range of cutting off, and only the feeder carrying secondary or tertiary load is calculated for loss; secondly, the output line power is determined, and the output line power cumulative value Δ P L is greater than Δ P , and the output line combination with the minimum total load economic loss value is taken as the optimal cut feeder combination. At this time, the power loss value Δ P Loss = Δ P L of the power system can be obtained, and the economic loss is C dl .

[0061] S209, since the fault equipment does not contain a backup transformer, it is unable to fill the active power shortage caused by the fault equipment with power. If the research equipment is the output line, at this time, Δ P Loss = Δ P d , and only the line can be cut off, and the economic loss is the line's C dl If it is not the output line, the output line power cumulative value Δ P L is greater than Δ P , and the output line combination with the minimum total load economic loss value is taken as the optimal cut feeder combination.

[0062] S210. Because the standby capacity of the standby transformer is greater than the active power transmission deficit caused by the failure of the equipment, the load loss value Δ of the power system in this case is... P Loss =0.

[0063] In this example, taking the electrical connection method of a 220kV substation in a certain area as an example, the research equipment is analyzed specifically using a power transformer as an example, including:

[0064] S301. By pre-setting nodes, the data and electrical connection relationships of each device within the substation are determined in the form of a data table. The substation electrical wiring diagram is as follows: Figure 3 As shown, this example has one power input line, three power transformers, and fourteen power output lines. The capacities of the three transformers (corresponding to equivalent nodes 3, 5, and 7) are 150MVA, 150MVA, and 180MVA, respectively. The upper limit of active power transmission for the 220kV and 110kV lines is calculated based on the line thermal stability limit and set with reference to national standards.

[0065] S302. Assume that the active power transmission of the three transformers during normal operation is 50% of their total capacity, and ignore network losses in the substation's line transmission during the calculation. Table 1 shows the power generation ratio information of various industries in a certain region, collected through national statistical data. Assuming that the power transmission situation and load type and ratio of each outgoing line of the substation are as shown in Table 2, the unit time economic index of the power of each outgoing line can be calculated based on the power generation ratio information of each industry.

[0066] Table 1. Electricity consumption, output value, and electricity production ratio of various industries in a certain region in a certain year.

[0067]

[0068] Table 2. Active power transmission, load type ratio, and economic indicators for each outgoing line.

[0069]

[0070] S303. Taking power transformers as an example, the research equipment assumes that all three transformers may be deactivated, or two transformers may be deactivated simultaneously. This example analyzes three scenarios: transformer 3 deactivated (Example 1), transformers 3 and 5 deactivated simultaneously (Example 2), and power output line 10 deactivated (Example 3). Based on the electrical wiring relationship and the power of each output line, ΔP in Example 1 can be obtained. d(1) = P d-3 = 75MW, ΔP in Example 2 d(2) = P d-3\4= 2x75 = 150MW, ΔP of example 3 d(3) = P d-10 = 15MW.

[0071] S304, according to the system electrical wiring relationship, confirm whether the fault equipment contains a standby transformer. For this example, the multiple power transformers connected between the same bus in the substation can be regarded as standby transformers between each other, so S305 is performed. The power outgoing line 10 is a single return line, which is an independent outgoing line to a specific area and has no standby transformer, so S308 is performed.

[0072] S305, according to the rated capacity constraint of the standby transformer, calculate the remaining active capacity ΔP P s of the standby transformer existing on the basis of meeting the equipment power factor requirement. For the 220kV main transformer, the power factor should not be less than 0.95, then P max(3\5) = 150x0.95 = 142.5MW, P max(3\5) = 180x0.95 = 171MW. Taking the conventional remaining active capacity calculation method as an example, then for example 1, ΔP P s(1) = 142.5-75+171-90 = 148.5MW; for example 2, ΔP P s(2) = 171-90 = 81MW.

[0073] S306, calculate the difference ΔP P d between the system active power shortage ΔP P s and the remaining active capacity ΔP P = ΔP P s - ΔP P d of the studied power equipment exiting. For example 1, ΔP P (1) = ΔP P s(1) - ΔP P d(1) = 148.5-75 = 73.5MW>0, S309 is performed; for example 2, ΔP P (2) = ΔP P s(2) - ΔP P d(2) = 81-150 = -69MW<0, S307 is performed.

[0074] S307, power determination is performed on the feeder with two or three levels of load, and line power cumulative value Δ is calculated P L greater than Δ P , and total load economic loss value per unit time The smallest outgoing line combination is used as the optimal cut-out line combination. For example 2, the active power transmission shortage of the power system is Δ P = 69MW, at this time the corresponding optimal cut-out line combination (outgoing line number) is [1, 5, 6, 9], and the power loss value of the power system is Δ P Loss = Δ P L = 15+18+18+20=71 MW, and the load economic loss is 401.94 yuan / hour.

[0075] S308, since there is no standby transformer, the power shortage caused by it cannot be filled with power, so the power loss value of the power system in example 3 is Δ P Loss = Δ P d = 15MW, and the corresponding load economic loss is 67.5 yuan / hour.

[0076] S309, since the standby capacity of the standby transformer is greater than the active power transmission shortage caused by the failure of the equipment, therefore, in example 1, the load loss value of the power system is Δ P Loss = 0MW.

[0077] In specific embodiments, please refer to Figure 4Fig. 2 is a structural schematic diagram of a load regulation system of an electric power system according to a second embodiment of the present application. The system comprises a backup transformer acquisition module 401, a parameter acquisition module 402, a power difference calculation module 403, a first removal module 404 and a second removal module 405. The backup transformer acquisition module 401 is configured to acquire a backup transformer of a first transformer in candidate transformers of the electric power system which have not failed when the first transformer fails. The backup transformer is a transformer having the same power outgoing line as the first transformer. The parameter acquisition module 402 is configured to acquire a remaining active capacity of the backup transformer and an active power of the first transformer. The power difference calculation module 403 is configured to calculate a power difference according to the remaining active capacity and the active power. The first removal module 404 is configured to select a target power outgoing line in an intersection of power outgoing lines of the backup transformer and the first transformer when the power difference is not positive, and remove the target power outgoing line. An accumulated value of outgoing line power of the target power outgoing line is greater than the power difference. The second removal module 405 is configured to not remove the power outgoing line when the power difference is positive.

[0078] In specific embodiments, the third embodiment of the present application provides a load regulation device of an electric power system, comprising a memory and a processor. The memory stores a computer program. The computer program is executed by the processor to make the processor execute the steps of the method according to any one of the first embodiment of the present application.

[0079] In specific embodiments, the fourth embodiment of the present application provides a computer readable storage medium storing a computer program. The computer program is executed by a processor to make the processor execute the steps of the method according to any one of the first embodiment of the present application.

[0080] The above embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it should not be understood as a limitation to the scope of the patent of the present application. It should be noted that for ordinary skilled in the art, without departing from the concept of the present application, several modifications and improvements can be made, which are all within the scope of protection of the present application. Therefore, the scope of protection of the patent of the present application should be subject to the appended claims.

[0081] The above merely describes preferred embodiments of the present application, but is not intended to limit the present application to other forms, any person skilled in the art can make changes or modifications to the above disclosed technical contents into equivalent embodiments with equivalent changes, and apply to other fields, but any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application without departing from the technical solution content of the present application still belongs to the protection scope of the present application technical solution.

Claims

1. A load regulation method for a power system, applied to a power system comprising multiple transformers, each transformer having at least one power output line for supplying power to loads, characterized in that... The method includes: When the first transformer in the power system fails, a backup transformer is selected from the candidate transformers in the power system that have not failed; the backup transformer is a transformer with the same power output as the first transformer. Obtain the remaining active capacity of the backup transformer and the active power of the first transformer; Calculate the power difference based on the remaining active capacity and the active power; When the power difference is non-positive, the target power output line is screened at the intersection of the power output line of the standby transformer and the power output line of the first transformer, and the target power output line is cut off; the cumulative value of the output power of the target power output line is greater than the power difference. When the power difference is positive, the power system does not disconnect the power output line; The step of screening the target power output at the intersection of the power output of the backup transformer and the power output of the first transformer includes: With the goal of the accumulated value being greater than the power difference and the accumulated value being the minimum, the target power output line is screened at the intersection of the power output line of the standby transformer and the power output line of the first transformer; The step of screening the target power output at the intersection of the power output of the backup transformer and the power output of the first transformer includes: With the goal of minimizing the total load economic loss per unit time while the accumulated value is greater than the power difference, the target power output is selected from the intersection of the power output of the standby transformer and the power output of the first transformer.

2. The load regulation method for a power system as described in claim 1, characterized in that, The total load economic loss value per unit time is obtained using the following formula: in, The total load economic loss value per unit time is given. To preset industry adjustment factors, The industry brought by power output lines i The magnitude of the power value, For industries in the region where the power system is located i Gross Domestic Product For industries in the region where the power system is located i Total electricity consumption.

3. The load regulation method for a power system as described in claim 1, characterized in that, The remaining active capacity is obtained based on the maximum rated capacity of the standby transformer, the active power of the power output line, and the number of power output lines of the standby transformer.

4. The load regulation method for a power system as described in claim 3, characterized in that, The remaining active power capacity is obtained using the following formula: in, The remaining active capacity, This represents the total maximum rated capacity of the standby transformers. For the first i The active power transmitted by the power output line. The power factor for line transmission. This refers to the number of power output lines of the standby transformer. This is the preset power factor requirement.

5. The load regulation method for a power system as described in claim 1, characterized in that, The method further includes: When there is no backup transformer for the first transformer in the power system, all second power output lines corresponding to the first transformer are disconnected.

6. A load regulation system for a power system, applied to the load regulation method for a power system as described in claim 1, characterized in that, The system includes: a backup transformer acquisition module, a parameter acquisition module, a power difference calculation module, a first cut-off module, and a second cut-off module; The backup transformer acquisition module is used to acquire a backup transformer for the first transformer from among the candidate transformers in the power system that have not failed after the first transformer in the power system fails; the backup transformer is a transformer with the same power output as the first transformer. The parameter acquisition module is used to acquire the remaining active capacity of the backup transformer and the active power of the first transformer. The power difference calculation module is used to calculate the power difference based on the remaining active capacity and the active power; The first cut-off module is used to screen the target power output line at the intersection of the power output line of the standby transformer and the power output line of the first transformer when the power difference is not a positive number, and cut off the target power output line; the cumulative value of the output power of the target power output line is greater than the power difference; The second disconnection module is used to prevent the power system from disconnecting power lines when the power difference is positive.

7. A load regulating device for a power system, comprising a memory and a processor, characterized in that, The memory stores a computer program that, when executed by the processor, causes the processor to perform the steps of the method as described in any one of claims 1 to 5.

8. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by a processor, the processor performs the steps of the method as described in any one of claims 1 to 5.

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