New energy unit control parameter day-ahead adjustment method, system, device and medium

Abstract

The application discloses a new energy unit control parameter day-ahead adjustment method, system, device and medium, and the method comprises the following steps: screening short-circuit current over-standard bus and corresponding operation mode according to day-ahead short-circuit current calculation results, and taking the bus and mode as a to-be-controlled bus and mode; selecting new energy units effective for short-circuit current control to form an adjustment scheme set, calculating the short-circuit current of each to-be-controlled mode after the adjustment scheme is applied, and screening to obtain an actual adjustment scheme; applying the actual adjustment scheme to the day-ahead operation mode respectively, performing transient voltage checking, if there is transient voltage instability, screening new energy units effective for transient voltage control to form an adjustment scheme set, calculating the short-circuit current of each operation mode after the adjustment scheme is applied, and obtaining the control parameter day-ahead adjustment scheme. The application has the beneficial effects that the problems of repeated adjustment of new energy unit control parameters and the problem of not considering the influence of the new energy unit control parameter adjustment on transient voltage in the prior art are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power system automation, and in particular to a new energy unit control parameter day-ahead adjustment method and system. BACKGROUND

[0002] With the continuous expansion of the current interconnected power grid, the power supply and grid structure are continuously strengthened, the network structure is increasingly dense, and the electrical connection is more closely, which leads to the problem that the short-circuit current levels of various voltage grades are close to or even exceed the switching breaking capacity. At the same time, with the advancement of the construction of ultra-high voltage direct current, the network structure of the sending and receiving end power grid is increasingly dense, and the electrical connection between the power grids is more closely, which further leads to the rapid growth of short-circuit current, and the contradiction between strengthening the network structure and controlling the short-circuit current level is more prominent, and the short-circuit current exceeding the standard has become one of the main problems restricting the development and safe and stable operation of the power grid. In view of the problem that the short-circuit current is close to or exceeds the switching breaking capacity, the conventional short-circuit current control measures such as pulling off the line and stopping the machine are mainly adopted, but these conventional short-circuit current control measures weaken the network structure, thereby leading to the problem that the transient voltage is prone to instability after the fault.

[0003] Considering that the short-circuit current of the new energy unit has high controllability, by adjusting the control parameters of the new energy unit, the size of the short-circuit current contributed by the new energy unit can be changed, which provides an important means for realizing the adjustable and controllable short-circuit current. However, the existing new energy unit participating in the short-circuit current control of the power grid has the following two problems, one is that the existing technical solution is mainly aimed at the problem that the short-circuit current exceeds the standard at a single section, and the control parameter adjustment measure of the new energy unit is given, and the problem of repeated adjustment of the control parameters of the new energy unit occurs as long as the short-circuit current exceeds the standard during the day, which affects the continuous and stable operation of the new energy unit; the second is that the existing technical solution does not consider the influence of the adjustment of the control parameters of the new energy unit on the transient voltage. SUMMARY

[0004] The present application provides a new energy unit control parameter day-ahead adjustment method, system, device and medium, which aims to solve the technical problems of repeated adjustment of the control parameters of the new energy unit and the influence of the adjustment of the control parameters of the new energy unit on the transient voltage in the prior art.

[0005] Technical solution: The application provides a new energy unit control parameter day-ahead adjustment method, which comprises the following steps: obtaining power grid day-ahead operation mode data set; calculating short-circuit current of each bus in the power grid according to the day-ahead operation mode data set, and screening the bus and the corresponding operation mode with short-circuit current higher than the safety standard to obtain the bus to be controlled and the mode to be controlled; selecting a first new energy unit set effective for short-circuit current control from a candidate new energy unit measure set, and gradually adjusting the reactive current proportion coefficient or reactive current top value multiple of the new energy unit in the first new energy unit set to obtain multiple adjustment schemes; applying the adjustment schemes to each to-be-controlled mode respectively, and calculating the corresponding short-circuit current; screening the actual adjustment scheme for day-ahead application according to the calculated short-circuit current; if the short-circuit current of the to-be-controlled bus is less than or equal to the safety standard, the corresponding adjustment scheme is taken as the actual adjustment scheme; if the short-circuit current of the to-be-controlled bus is greater than the safety standard, the corresponding adjustment scheme and the conventional short-circuit current control measure are applied as the actual adjustment scheme; applying the actual adjustment scheme to each operation mode of the power grid day-ahead respectively, and performing transient voltage checking; if there is transient voltage instability, the adjustment scheme and the actual adjustment scheme are re-determined; selecting a second new energy unit set effective for transient voltage control from the candidate new energy unit measure set, and gradually adjusting the reactive current proportion coefficient or reactive current top value multiple of the new energy unit in the second new energy unit set to obtain multiple adjustment schemes; applying the adjustment schemes to each operation mode of the power grid day-ahead respectively, and calculating the corresponding short-circuit current; taking the adjustment scheme corresponding to the bus short-circuit current less than or equal to the safety standard of all operation modes of the power grid day-ahead as the actual adjustment scheme, and applying the actual adjustment scheme.

[0006] Specifically, the day-ahead operation mode data set comprises the following data of the power grid day-ahead: power generation plan, DC dispatching plan, power equipment maintenance plan, load distribution and new energy power generation distribution.

[0007] Specifically, the determination process of the first new energy unit set comprises the following steps: calculating the electrical distance between the new energy unit in the candidate new energy unit measure set and the to-be-controlled bus, and adding the new energy unit with the electrical distance less than or equal to the standard distance into the first new energy unit set; the determination process of the second new energy unit set comprises the following steps: calculating the electrical distance between the new energy unit in the candidate new energy unit measure set and the transient voltage instability bus, and adding the new energy unit with the electrical distance less than or equal to the standard distance into the second new energy unit set; the new energy unit participating in the short-circuit current control is removed from the second new energy unit set, and the remaining new energy unit in the second new energy unit set is the new energy unit effective for transient voltage control.

[0008] Specifically, the step-by-step adjustment of the reactive current proportion coefficient or the reactive current top value multiple of the new energy unit in the first new energy unit set comprises: keeping the reactive current proportion coefficient of the new energy unit unchanged, taking the minimum value of the reactive current top value multiple as the starting point, the current value as the ending point, and the first adjustment value as the step length to obtain multiple reactive current top value multiple adjustment schemes; keeping the reactive current top value multiple of the new energy unit unchanged, taking the minimum value of the reactive current proportion coefficient as the starting point, the current value as the ending point, and the second adjustment value as the step length to obtain multiple reactive current proportion coefficient adjustment schemes; and the obtained reactive current top value multiple adjustment scheme and the reactive current proportion coefficient adjustment scheme are collectively used as the adjustment scheme of the to-be-controlled mode.

[0009] Specifically, the step-by-step adjustment of the reactive current proportion coefficient or the reactive current top value multiple of the new energy unit in the second new energy unit set comprises: keeping the reactive current proportion coefficient of the new energy unit unchanged, taking the current value of the reactive current top value multiple as the starting point and the maximum value as the ending point, and taking the first adjustment value as the step length to obtain multiple reactive current top value multiple adjustment schemes; keeping the reactive current top value multiple of the new energy unit unchanged, taking the current value of the reactive current proportion coefficient as the starting point and the maximum value as the ending point, and taking the second adjustment value as the step length to obtain multiple reactive current proportion coefficient adjustment schemes; and the obtained reactive current top value multiple adjustment scheme and the reactive current proportion coefficient adjustment scheme are collectively used as the adjustment scheme of the day-ahead operation mode of the power grid.

[0010] Specifically, if the short-circuit current of the to-be-controlled bus is less than or equal to the safety standard, the corresponding adjustment scheme is used as the actual adjustment scheme, which comprises: selecting the adjustment scheme with the smallest adjustment amount of the new energy unit parameter as the actual adjustment scheme.

[0011] Specifically, if the short-circuit current of the to-be-controlled bus is greater than the safety standard, the corresponding adjustment scheme and the conventional short-circuit current control measure are simultaneously applied as the actual adjustment scheme, which comprises: selecting the corresponding conventional short-circuit current control measure for the operation mode with the short-circuit current greater than the safety standard, and simultaneously applying the selected conventional short-circuit current control measure and the adjustment scheme; in the combination of the conventional short-circuit current control measure and the adjustment scheme with the short-circuit current less than or equal to the safety standard, the adjustment scheme with the smallest adjustment amount of the new energy unit parameter and the smallest cost of the conventional short-circuit current control measure is selected as the actual adjustment scheme.

[0012] Specifically, the adjustment scheme with the short-circuit current of the bus less than or equal to the safety standard for all day-ahead operation modes is used as the actual adjustment scheme, which comprises: in the adjustment scheme with the short-circuit current less than or equal to the safety standard, the adjustment scheme with the largest adjustment amount of the new energy unit parameter is selected as the actual adjustment scheme.

[0013] The application further provides a new energy unit control parameter day-ahead adjustment system, comprising an operation data acquisition unit, a short-circuit current calculation unit and an adjustment application unit, wherein: the operation data acquisition unit is used to acquire day-ahead operation mode data set of a power grid; the short-circuit current calculation unit is used to calculate short-circuit currents of each bus in the power grid according to the day-ahead operation mode data set, and to screen out buses with short-circuit currents higher than a safety standard and corresponding operation modes, and to take the screened buses and operation modes as to-be-controlled buses and to-be-controlled modes; the adjustment application unit is used to select a first new energy unit set effective for short-circuit current control, to gradually adjust reactive current proportion coefficients or reactive current top value multiples of new energy units in the first new energy unit set, to obtain multiple adjustment schemes, to apply the adjustment schemes to each to-be-controlled mode respectively, to calculate corresponding short-circuit currents, to screen actual adjustment schemes for day-ahead application according to the calculated short-circuit currents, to take corresponding adjustment schemes as actual adjustment schemes if short-circuit currents of the to-be-controlled buses are all less than or equal to the safety standard, and to take the corresponding adjustment schemes and conventional short-circuit current control measures as actual adjustment schemes simultaneously if short-circuit currents of the to-be-controlled buses are greater than the safety standard, to apply actual adjustment schemes to each operation mode of the power grid day-ahead respectively, to perform transient voltage checking, to re-determine adjustment schemes and actual adjustment schemes therein if there is transient voltage instability, to screen a second new energy unit set effective for transient voltage control from a candidate new energy unit measure set, to gradually adjust reactive current proportion coefficients or reactive current top value multiples of new energy units in the second new energy unit set, to obtain multiple adjustment schemes, to apply the adjustment schemes to each operation mode of the power grid day-ahead respectively, to calculate corresponding short-circuit currents, to take adjustment schemes corresponding to the condition that short-circuit currents of buses of all operation modes of the power grid day-ahead are less than or equal to the safety standard as actual adjustment schemes, and to apply the actual adjustment schemes.

[0014] The application further provides an electronic device comprising a memory and a processor, wherein a computer program executable by the processor is stored in the memory, and when the computer program is executed by the processor, the new energy unit control parameter day-ahead adjustment method of any one of the application is executed.

[0015] The application further provides a computer readable storage medium, wherein a computer program is stored on the computer readable storage medium, and when the computer program is executed by a processor, the steps of the new energy unit control parameter day-ahead adjustment method of any one of the application are implemented.

[0016] Advantages: Compared with the prior art, the application has the following remarkable advantages: the problems of repeated adjustment of new energy unit control parameters and failure to consider the influence of the adjustment of new energy unit control parameters on transient voltage in the prior art are solved, and the safe and stable economic operation ability of the power system is improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 A step schematic diagram of a new energy unit control parameter day-ahead adjustment method provided by the application. DETAILED DESCRIPTION

[0018] The technical solutions of the application will be further described below with reference to the drawings.

[0019] Reference Figure 1 A step schematic diagram of a new energy unit control parameter day-ahead adjustment method provided by the application.

[0020] In the embodiment of the application, the day-ahead operation mode data set of the power grid is acquired.

[0021] In the embodiment of the application, the day-ahead operation mode data set acquisition comprises acquiring the following data of the day-ahead power grid: power generation plan, direct current dispatching plan, power equipment maintenance plan, load distribution and new energy power generation distribution.

[0022] In the specific implementation, the load distribution refers to the regional distribution and time distribution of the load, the regional distribution refers to the load carried by the power grid or bus in different regions, and the time distribution refers to the load carried by the power grid or bus in different time periods; the new energy power generation distribution also refers to the regional distribution and time distribution of the new energy, the regional distribution refers to the power generation of the new energy in different regions, and the time distribution refers to the power generation of the new energy in different time periods.

[0023] In the embodiment of the application, the short-circuit current of each bus in the power grid is calculated according to the day-ahead operation mode data set, and the buses with the short-circuit current higher than the safety standard (which can be set according to the rated breaking capacity of the actual circuit breaker) and the operation mode with the short-circuit current of the bus higher than the safety standard are selected, and the selected buses and operation mode are taken as the to-be-controlled buses and to-be-controlled mode.

[0024] In the specific implementation, the day-ahead power grid operation mode usually includes 96, and the short-circuit current of each bus in the power grid can be calculated through the operation mode data, and the buses with the short-circuit current exceeding the safety standard and the operation mode with the short-circuit current of the bus higher than the safety standard are selected as the to-be-controlled buses and to-be-controlled mode.

[0025] The first new energy unit set effective for short-circuit current control is selected from the candidate new energy unit measure set, the reactive current proportion coefficient or reactive current top value multiple of the new energy unit in the first new energy unit set is adjusted step by step, a plurality of adjustment schemes are obtained, the adjustment schemes are applied to each to-be-controlled mode respectively, and the corresponding short-circuit current is calculated.

[0026] In the embodiment of the present application, the electrical distance between the candidate new energy unit measure set and the to-be-controlled bus is calculated, and the new energy unit with an electrical distance less than or equal to a standard distance (which can be adjusted according to actual application) is added to the first new energy unit set.

[0027] In a specific implementation, the electrical distance between the new energy unit and the to-be-controlled bus is less than or equal to a standard distance. When the electrical distance between the new energy unit and the to-be-controlled bus is relatively short, the effect of adjusting the control parameter of the new energy unit on the short-circuit current of the to-be-controlled bus is relatively obvious, and when the electrical distance is relatively long, the effect of adjusting the control parameter of the new energy unit on the short-circuit current of the to-be-controlled bus is almost negligible. Therefore, it is required that the electrical distance between the new energy unit and the to-be-controlled bus is less than or equal to a certain safety standard distance.

[0028] In the embodiment of the present application, the determination method of the new energy unit control parameter adjustment scheme effective for short-circuit current control is as follows: the reactive current proportion coefficient of the new energy unit is kept unchanged, the minimum value of the reactive current top value multiple is taken as the starting point, the current value is taken as the ending point, the first adjustment value (which can be set according to the actual application scene, generally 0.1) is taken as the step size, and a plurality of reactive current top value multiple adjustment schemes are obtained; the reactive current top value multiple of the new energy unit is kept unchanged, the minimum value of the reactive current proportion coefficient is taken as the starting point, the current value is taken as the ending point, the second adjustment value (which can be set according to the actual application scene, generally 0.3) is taken as the step size, and a plurality of reactive current proportion coefficient adjustment schemes are obtained; and the obtained reactive current top value multiple adjustment scheme and reactive current proportion coefficient adjustment scheme are taken as the adjustment scheme of the to-be-controlled mode.

[0029] In a specific implementation, the reactive current proportion coefficient refers to the adjustment coefficient of the reactive current of the new energy unit during low voltage ride through. The reactive current top value multiple refers to the maximum limit of the reactive current of the new energy unit.

[0030] In a specific implementation, the determination method of the adjustment scheme is that one of the reactive current proportion coefficient and the reactive current top value multiple is kept unchanged, and the other is adjusted at a fixed step size. Each step size is an adjustment scheme.

[0031] In a specific implementation, the current value of the reactive current top value multiple and the current value of the reactive current proportion coefficient refer to the current values when the control parameters of the new energy unit are not adjusted.

[0032] In a specific implementation, the adjustment scheme is applied to each to-be-controlled mode, that is, after the parameters of the new energy unit are adjusted (usually through simulation calculation data), the short-circuit current of the bus under each adjustment scheme under each to-be-controlled mode is calculated.

[0033] In the embodiment of the present application, after the adjustment scheme is applied to each to-be-controlled mode, the following two cases usually occur: case (1), if the short-circuit current of the to-be-controlled bus is less than or equal to the safety standard, the corresponding adjustment scheme is taken as the actual adjustment scheme; case (2), if the short-circuit current of the to-be-controlled bus is greater than the safety standard, the corresponding adjustment scheme and the conventional short-circuit current control measure are applied as the actual adjustment scheme.

[0034] In the above case (1), the adjustment scheme with the smallest adjustment amount of the new energy unit parameter is taken as the actual adjustment scheme in the embodiment of the present application.

[0035] In the specific implementation, in the above case (2), since there is a case that the short-circuit current is greater than the safety standard, it is difficult to completely eliminate the short-circuit current by relying only on the adjustment of the new energy unit parameter, and therefore, the conventional short-circuit current control measure needs to be introduced to control the short-circuit current together with the new energy unit.

[0036] In the above case (2), the corresponding conventional short-circuit current control measure is selected for the mode with the short-circuit current greater than the safety standard in the embodiment of the present application, and is applied together with the new energy control parameter adjustment scheme as a combination; in the combination of the multiple conventional short-circuit current control measures and adjustment schemes, the actual adjustment scheme is selected according to the application result in the combination, that is, the adjustment amplitude of the new energy unit parameter is the smallest, the short-circuit current meets the requirement (is less than or equal to the safety standard), and the cost of the conventional short-circuit current control measure is the smallest, and the actual adjustment scheme is selected.

[0037] In the specific implementation, the smallest adjustment amplitude of the new energy unit parameter means the smallest adjustment amount of the reactive current proportion coefficient or the reactive current top value multiple, and the smallest cost of the conventional short-circuit current control measure means the smallest loss, because the conventional measure has an economic cost, for example, stopping a traditional generator set will cause economic loss.

[0038] In the specific implementation, different short-circuit current over-standard modes have corresponding conventional control measures, which generally include stopping a unit, stopping a line, bus split and line out of series, and one or more conventional measures corresponding to the short-circuit current over-standard mode need to be selected, if there are multiple conventional measures, all of them are applied, because all bus short-circuit currents need to meet the requirement, and therefore all measures are adopted.

[0039] In the embodiment of the present application, the actual adjustment scheme is applied to each operation mode of the power grid in advance, and the transient voltage is checked, if there is transient voltage instability, the adjustment scheme and the actual adjustment scheme are determined again. Correspondingly, if there is no transient voltage instability, the step process provided by the present application can be ended, and the obtained actual adjustment scheme can be applied.

[0040] In the embodiment of the present application, the process of re-determining the adjustment scheme and the actual adjustment scheme therein includes: selecting a second new energy unit set effective for transient voltage control from the candidate new energy unit set, gradually adjusting the reactive current proportion coefficient or the reactive current top value multiple of the new energy unit in the second new energy unit set, obtaining a plurality of adjustment schemes, applying the adjustment schemes to each operation mode of the day-ahead power grid respectively, and calculating the corresponding short-circuit current, taking the adjustment scheme with the bus short-circuit current of all operation modes of the day-ahead less than or equal to the corresponding safety standard as the actual adjustment scheme, and applying the actual adjustment scheme.

[0041] In the embodiment of the present application, the second new energy unit set effective for transient voltage control is selected from the candidate new energy unit set, including: calculating the electrical distance between the new energy unit in the candidate new energy unit set and the transient voltage instability bus, adding the new energy unit with the electrical distance less than or equal to the standard distance to the second new energy unit set; and removing the new energy unit participating in the short-circuit current control from the second new energy unit set, and the remaining new energy unit in the second new energy unit set is the new energy unit effective for transient voltage control.

[0042] In the specific implementation, because the short-circuit current control needs to reduce the parameters of the new energy unit, and the transient voltage control needs to increase the parameters of the new energy unit, there is a contradiction between the two, therefore, in the case of transient voltage instability, the new energy unit participating in the short-circuit current control is removed from the new energy unit set, and the remaining new energy unit is the effective new energy unit capable of performing transient voltage instability control.

[0043] In the embodiment of the present application, the adjustment scheme with the bus short-circuit current of all operation modes of the day-ahead less than or equal to the corresponding safety standard is taken as the actual adjustment scheme, including: in the actual adjustment scheme with the short-circuit current less than or equal to the safety standard, the new energy unit parameter adjustment range is the largest, and the actual adjustment scheme is selected.

[0044] The application further provides a new energy unit control parameter day-ahead adjustment system, comprising an operation data acquisition unit, a short-circuit current calculation unit and an adjustment application unit, wherein the operation data acquisition unit is configured to acquire day-ahead operation mode data sets of a power grid; the short-circuit current calculation unit is configured to calculate short-circuit currents of each bus in the power grid according to the day-ahead operation mode data sets, and select buses with short-circuit currents higher than a safety standard and corresponding operation modes from the short-circuit currents, and take the selected buses and operation modes as to-be-controlled buses and to-be-controlled modes; and the adjustment application unit is configured to select a first new energy unit set effective for short-circuit current control, gradually adjust reactive current proportion coefficients or reactive current top value multiples of new energy units in the first new energy unit set, obtain multiple adjustment schemes, apply the adjustment schemes to each to-be-controlled mode respectively, calculate corresponding short-circuit currents, select a day-ahead actual adjustment scheme according to the calculated short-circuit currents, take a corresponding adjustment scheme as the actual adjustment scheme if short-circuit currents of the to-be-controlled buses are all less than or equal to the safety standard, and take the corresponding adjustment scheme and a conventional short-circuit current control measure as the actual adjustment scheme if short-circuit currents of the to-be-controlled buses are greater than the safety standard, apply the actual adjustment scheme to each operation mode of the power grid day-ahead respectively, and perform transient voltage checking, re-determine the adjustment scheme and the actual adjustment scheme if there is transient voltage instability, select a second new energy unit set effective for transient voltage control from a candidate new energy unit measure set, gradually adjust reactive current proportion coefficients or reactive current top value multiples of new energy units in the second new energy unit set, obtain multiple adjustment schemes, apply the adjustment schemes to each operation mode of the power grid day-ahead respectively, calculate corresponding short-circuit currents, take an adjustment scheme corresponding to the condition that short-circuit currents of buses of all operation modes of the power grid day-ahead are less than or equal to the safety standard as the actual adjustment scheme, and apply the actual adjustment scheme.

[0045] The application further provides an electronic device comprising a memory and a processor, wherein the memory stores a computer program executable by the processor, and when the computer program is executed by the processor, any one of the new energy unit control parameter day-ahead adjustment methods provided by the application is executed.

[0046] The application further provides a computer readable storage medium, wherein the computer readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of any one of the new energy unit control parameter day-ahead adjustment methods provided by the application are implemented.

[0047] Those skilled in the art will appreciate that embodiments of the present application can be readily used as a method, a system or a computer program product. Accordingly, the present application can take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application can take the form of a computer program product on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROMs, optical storage devices, etc.) embodying computer readable program code.

[0048] The present application is described in reference to the flowchart illustrations and / or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart illustrations and / or block diagrams. Figure 1 one or more functions specified in the flowchart illustrations and / or block diagrams. Figure 1 means for carrying out each of the one or more functions specified in the flowchart illustrations and / or block diagrams.

[0049] These computer program instructions can also be stored in a computer- readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instructions which implement the functions specified in the flowchart illustrations and / or block diagrams. Figure 1 one or more functions specified in the flowchart illustrations and / or block diagrams. Figure 1 means for carrying out each of the one or more functions specified in the flowchart illustrations and / or block diagrams.

[0050] These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart illustrations and / or block diagrams. Figure 1 one or more functions specified in the flowchart illustrations and / or block diagrams. Figure 1 means for carrying out each of the one or more functions specified in the flowchart illustrations and / or block diagrams.

Claims

1. A method for day-ahead adjustment of control parameters of a new energy unit, characterized in that, The method comprises the following steps: obtaining a power grid day-ahead operation mode data set; calculating short-circuit currents of each bus in the power grid according to the day-ahead operation mode data set, and screening the bus and the corresponding operation mode whose short-circuit current is higher than a safety standard to obtain a bus to be controlled and an operation mode to be controlled; selecting a first new energy unit set from a candidate new energy unit measure set, which is effective for short-circuit current control, and gradually adjusting a reactive current proportion coefficient or a reactive current top value multiple of the new energy unit in the first new energy unit set to obtain multiple adjustment schemes, applying the adjustment schemes to each operation mode to be controlled respectively, and calculating corresponding short-circuit currents, and screening an actual adjustment scheme according to the calculated short-circuit currents; if the short-circuit currents of the bus to be controlled are all less than or equal to the safety standard, the corresponding adjustment scheme is taken as the actual adjustment scheme; if there is a bus to be controlled whose short-circuit current is greater than the safety standard, the corresponding adjustment scheme and a conventional short-circuit current control measure are applied as the actual adjustment scheme; applying the actual adjustment scheme to each operation mode of the power grid day-ahead respectively, and performing transient voltage checking, if there is transient voltage instability, the adjustment scheme and the actual adjustment scheme are re-determined; selecting a second new energy unit set from the candidate new energy unit measure set, which is effective for transient voltage control, and gradually adjusting a reactive current proportion coefficient or a reactive current top value multiple of the new energy unit in the second new energy unit set to obtain multiple adjustment schemes, applying the adjustment schemes to each operation mode of the power grid day-ahead respectively, and calculating corresponding short-circuit currents, and taking the adjustment scheme corresponding to the bus short-circuit current less than or equal to the safety standard of all operation modes of the day-ahead as the actual adjustment scheme, and applying the actual adjustment scheme.

2. The new energy unit control parameter day-ahead adjustment method according to claim 1, characterized in that, The day-ahead operation mode data set is obtained through the following data of the power grid day-ahead: power generation plan, DC dispatching plan, power equipment maintenance plan, load distribution and new energy power generation distribution.

3. The new energy unit control parameter day-ahead adjustment method according to claim 1, characterized in that, The first new energy unit set is selected from the candidate new energy unit measure set, which is effective for short-circuit current control, and comprises the following steps: calculating the electrical distance between the new energy unit in the candidate new energy unit measure set and the bus to be controlled, and adding the new energy unit with an electrical distance less than or equal to a standard distance to the first new energy unit set; The second new energy unit set is selected from the candidate new energy unit measure set, which is effective for transient voltage control, and comprises the following steps: calculating the electrical distance between the new energy unit in the candidate new energy unit measure set and the bus with transient voltage instability, and adding the new energy unit with an electrical distance less than or equal to a standard distance to the second new energy unit set; The new energy unit participating in short-circuit current control is excluded from the second new energy unit set, and the remaining new energy unit in the second new energy unit set is the new energy unit effective for transient voltage control.

4. The new energy unit control parameter day-ahead adjustment method according to claim 1, characterized in that, The reactive current proportion coefficient or the reactive current top value multiple of the new energy unit in the first new energy unit set is gradually adjusted, and comprises the following steps: The reactive current proportion coefficient of the new energy unit is kept unchanged, the minimum value of the reactive current top value multiple is taken as the starting point, the current value is taken as the ending point, and the first adjustment value is taken as the step length to obtain multiple reactive current top value multiple adjustment schemes; the reactive current top value multiple of the new energy unit is kept unchanged, the minimum value of the reactive current proportion coefficient is taken as the starting point, the current value is taken as the ending point, and the second adjustment value is taken as the step length to obtain multiple reactive current proportion coefficient adjustment schemes; The obtained reactive current top value multiple adjustment scheme and the reactive current proportion coefficient adjustment scheme are taken as the adjustment scheme of the to-be-controlled mode; The step-by-step adjustment of the reactive current proportion coefficient or the reactive current top value multiple of the new energy unit in the second new energy unit set includes: The reactive current proportion coefficient of the new energy unit is kept unchanged, the current value of the reactive current top value multiple is taken as the starting point, and the maximum value is taken as the ending point, and the first adjustment value is taken as the step length to obtain multiple reactive current top value multiple adjustment schemes; the reactive current top value multiple of the new energy unit is kept unchanged, the current value of the reactive current proportion coefficient is taken as the starting point, and the maximum value is taken as the ending point, and the second adjustment value is taken as the step length to obtain multiple reactive current proportion coefficient adjustment schemes; The obtained reactive current top value multiple adjustment scheme and the reactive current proportion coefficient adjustment scheme are taken as the adjustment scheme of the day-ahead operation mode of the power grid.

5. The new energy unit control parameter day-ahead adjustment method according to claim 1, characterized in that, If the short-circuit current of the to-be-controlled bus is less than or equal to the safety standard, the corresponding adjustment scheme is taken as the actual adjustment scheme, including: The adjustment scheme with the smallest adjustment amount of the new energy unit parameter is taken as the actual adjustment scheme.

6. The new energy unit control parameter day-ahead adjustment method according to claim 1, characterized in that, If the short-circuit current of the to-be-controlled bus is greater than the safety standard, the corresponding adjustment scheme and the conventional short-circuit current control measure are applied as the actual adjustment scheme, including: The corresponding conventional short-circuit current control measure is selected for the operation mode in which the short-circuit current is greater than the safety standard, and the selected conventional short-circuit current control measure and the adjustment scheme are applied as a combination; In the combination of the conventional short-circuit current control measure and the adjustment scheme in which the short-circuit current is less than or equal to the safety standard, the one with the smallest adjustment amplitude of the new energy unit parameter and the smallest cost of the conventional short-circuit current control measure is selected as the actual adjustment scheme.

7. The method of claim 1, wherein, The adjustment scheme in which the short-circuit current of all the operation modes of the day-ahead is less than or equal to the safety standard is taken as the actual adjustment scheme, including: In the adjustment scheme in which the short-circuit current is less than or equal to the safety standard, the one with the largest adjustment amplitude of the new energy unit parameter is selected as the actual adjustment scheme.

8. A new energy unit control parameter day-ahead adjustment system, characterized in that, including: An operation data acquisition unit, a short-circuit current calculation unit, and an adjustment application unit, wherein: The operation data acquisition unit is configured to acquire day-ahead operation mode data sets of the power grid; The short-circuit current calculation unit is configured to calculate the short-circuit currents of the buses in the power grid according to the day-ahead operation mode data sets, to screen buses and corresponding operation modes with short-circuit currents higher than a safety standard, and to take the screened buses and operation modes as to-be-controlled buses and to-be-controlled modes; The adjustment application unit is configured to select a first new energy unit set effective for short-circuit current control, gradually adjust the reactive current proportion coefficient or the reactive current top value multiple of the new energy units in the first new energy unit set, obtain multiple adjustment schemes, apply the adjustment schemes to each to-be-controlled mode respectively, calculate corresponding short-circuit currents, select an actual adjustment scheme according to the calculated short-circuit currents, and apply the actual adjustment scheme to each operation mode of the power grid in the day-ahead period and perform transient voltage checking. If there is transient voltage instability, the adjustment scheme and the actual adjustment scheme are re-determined. A second new energy unit set effective for transient voltage control is selected from the candidate new energy unit set, the reactive current proportion coefficient or the reactive current top value multiple of the new energy units in the second new energy unit set is gradually adjusted, multiple adjustment schemes are obtained, the adjustment schemes are applied to each operation mode of the power grid in the day-ahead period respectively, and corresponding short-circuit currents are calculated. The adjustment scheme corresponding to the bus short-circuit current less than or equal to the safety standard of all operation modes in the day-ahead period is selected as the actual adjustment scheme, and the actual adjustment scheme is applied.

9. An electronic device, comprising: The computer program is executed by the processor to implement the steps of the new energy unit control parameter day-ahead adjustment method of any one of claims 1 to 7.

10. A computer-readable storage medium having stored thereon a computer program, characterized in that, The computer program is executed by the processor to implement the steps of the new energy unit control parameter day-ahead adjustment method of any one of claims 1 to 7.

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