An online emergency control method, system, storage medium and computing device

Abstract

The present invention discloses an online emergency control method, system, storage medium and computing device. The present invention pre-divides control quantities for online emergency control strategies within a short period. In the case of a predicted fault, the corresponding control quantity is directly matched through the power of the transmission section at the current moment, so that the online emergency control is not prone to mismatch, the control accuracy is finer, the matching is more accurate, and the adaptability is stronger.

Description

Technical Field

[0001] The present invention relates to an online emergency control method, system, storage medium and computing equipment, and belongs to the technical field of power system safety and stability control. Background Art

[0002] Transmission sections, as channels for power transmission and corridors for electrical connections, represent a concentrated vulnerability in the power grid. Excessive transmission power can pose safety and stability risks. To meet practical engineering needs, transmission sections are often monitored as key characteristic variables for stability control. For most online emergency control strategies that use section power as a characteristic, the control variable generally varies monotonically with section power. However, for local power grids with large-scale renewable energy access, the control variable does not simply vary monotonically with section power, exhibiting certain nonlinear characteristics. Online pre-decision strategies, which use the actual grid operation mode in the period before a fault, have only one control variable. Since online pre-decision calculations typically take several minutes, the risk of control variable mismatch increases. Summary of the Invention

[0003] The present invention provides an online emergency control method, system, storage medium and computing device, which solve the problems disclosed in the background technology.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0005] An online emergency control method, comprising:

[0006] In response to detecting the occurrence of a predicted fault, obtaining the transmission section power at the current moment;

[0007] Obtaining a control quantity corresponding to the transmission section power at the current moment under an anticipated fault from a pre-classified short-cycle online emergency control strategy for control quantities; wherein the anticipated fault occurs within the short cycle, and the process of pre-classifying the control quantity of the online emergency control strategy within the short cycle is as follows: determining the ultimate conservative transmission section power and the ultimate optimistic transmission section power within the short cycle based on the transmission section power at the start moment of the short cycle and the transmission section ultimate power interval; and classifying the control quantity of the online emergency control strategy within the short cycle based on the ultimate conservative transmission section power and the ultimate optimistic transmission section power within the short cycle; the ultimate conservative transmission section power is the transmission section power corresponding to the maximum control quantity of the online emergency control strategy, and the ultimate optimistic transmission section power is the transmission section power corresponding to the minimum control quantity of the online emergency control strategy;

[0008] Online emergency control is performed using the control quantity corresponding to the transmission section power at the current moment.

[0009] Determine the ultimate conservative transmission section power and the ultimate optimistic transmission section power within a short period according to the transmission section power at the starting moment of the short period and the transmission section limit power range, including:

[0010] Calculate the actual possible transmission section power range within the short period according to the transmission section power at the starting moment of the short period;

[0011] Determine the ultimate conservative transmission section power and the ultimate optimistic transmission section power within the short period according to the actual possible transmission section power range and the transmission section limit power range within the short period.

[0012] The minimum value of the actual possible transmission section power range within the short period is the transmission section power at the starting moment of the short period minus 1 / 2 of the minute-level fluctuation range of the transmission section;

[0013] The maximum value of the actual possible transmission section power range within the short period is the sum of the transmission section power at the starting moment of the short period and 1 / 2 of the minute-level fluctuation range of the transmission section.

[0014] Determine the ultimate conservative transmission section power and the ultimate optimistic transmission section power within the short period according to the actual possible transmission section power range and the transmission section limit power range within the short period, including:

[0015] If P TL 1 is greater than P TL min , and the control quantity of the online emergency control strategy under P TL 1 is less than the control quantity of the online emergency control strategy under P TL 2 , the ultimate conservative transmission section power is P TL 2 ; where, P TL 1 is the minimum value of the actual possible transmission section power range within the short period, P TL 2 is the maximum value of the actual possible transmission section power range within the short period, and P TL min is the minimum value of the transmission section limit power range;

[0016] If P TL 1 is greater than P TL min , and the control quantity of the online emergency control strategy under P TL 1 is not less than the control quantity of the online emergency control strategy under P TL 2 , the ultimate conservative transmission section power is P TL1 ;

[0017] If P TL 1 is greater than P TL min , take the power of the transmission section with the minimum control quantity of the online emergency control strategy within (P TL 1 , P TL 2 ) as the limit optimistic transmission section power;

[0018] If P TL 1 is less than or equal to P TL min , P TL 2 is greater than P TL min , P TL min and the control quantity of the online emergency control strategy under P TL 2 is less than the control quantity of the online emergency control strategy under P TL 2 ;

[0019] If P TL 1 is less than or equal to P TL min , P TL 2 is greater than P TL min , P TL min and the control quantity of the online emergency control strategy under P TL 2 is not less than the control quantity of the online emergency control strategy under P TL min ;

[0020] If P TL 1 is less than or equal to P TL min , take the power of the transmission section with the minimum control quantity of the online emergency control strategy within (P TL min , P TL 2 ) as the limit optimistic transmission section power.

[0021] Based on the limit conservative transmission section power and the limit optimistic transmission section power within the short cycle, conduct grading of the control quantity of the online emergency control strategy within the short cycle, including:

[0022] If the difference between the control quantity corresponding to the power of the extremely conservative transmission section and the control quantity corresponding to the power of the extremely optimistic transmission section does not exceed P k , the control quantity of the online emergency control strategy within a short period is divided into one gear, and the output control quantity of one gear is f(P TL i ), and the transmission section power is located in [P TL i , P TL j ; where P k is the threshold of the grading unit, P TL i is the power of the extremely conservative transmission section, P TL j is the power of the extremely optimistic transmission section, and f(P TL i ) is the control quantity corresponding to the power of the extremely conservative transmission section;

[0023] If the difference between the control quantity corresponding to the power of the extremely conservative transmission section and the control quantity corresponding to the power of the extremely optimistic transmission section is greater than or equal to (N - 1)P k and less than NP k , the control quantity of the online emergency control strategy within a short period is divided into N gears, and the output control quantity of the nth gear is f(P TL i ) - (n - 1)P k , and the transmission section power is located in [P TL (n-1)i , P TL ni ; where N ≥ 2, n ∈ [1, N], P TL (n-1)i is the transmission section power corresponding to f(P TL i ) - (n - 1)P k , and P TL ni is the transmission section power corresponding to f(P TL i ) - nP k .

[0024] An online emergency control system, comprising:

[0025] Pre - grading module, which pre - grades the control quantities of the online emergency control strategy within a short period. The process is as follows: According to the transmission section power and the transmission section limit power range at the start time of the short period, determine the extremely conservative transmission section power and the extremely optimistic transmission section power within the short period. Then, according to the extremely conservative transmission section power and the extremely optimistic transmission section power within the short period, conduct the grading of the control quantities of the online emergency control strategy within the short period; among them, the extremely conservative transmission section power is the transmission section power corresponding to the maximum control quantity of the online emergency control strategy, and the extremely optimistic transmission section power is the transmission section power corresponding to the minimum control quantity of the online emergency control strategy;

[0026] Current section power acquisition module, in response to detecting the occurrence of a pre - conceived fault, acquires the transmission section power at the current moment;

[0027] Corresponding control quantity acquisition module, which acquires the control quantity corresponding to the transmission section power at the current moment under the pre - conceived fault from the online emergency control strategy within the short period with pre - controlled quantity grading; among them, the occurrence time of the pre - conceived fault is within the said short period;

[0028] Control module, which uses the control quantity corresponding to the transmission section power at the current moment to conduct online emergency control.

[0029] In the pre - grading module, the process of determining the extremely conservative transmission section power and the extremely optimistic transmission section power within the short period according to the transmission section power at the start time of the short period and the transmission section limit power range is as follows:

[0030] Calculate the actual possible transmission section power range within the short period according to the transmission section power at the start time of the short period;

[0031] Determine the extremely conservative transmission section power and the extremely optimistic transmission section power within the short period according to the actual possible transmission section power range within the short period and the transmission section limit power range.

[0032] In the pre - grading module, the minimum value of the actual possible transmission section power range within the short period is the transmission section power at the start time of the short period minus 1 / 2 of the minute - level fluctuation range of the transmission section, and the maximum value of the actual possible transmission section power range within the short period is the sum of the transmission section power at the start time of the short period and 1 / 2 of the minute - level fluctuation range of the transmission section.

[0033] In the pre - grading module, the process of determining the extremely conservative transmission section power and the extremely optimistic transmission section power within the short period according to the actual possible transmission section power range within the short period and the transmission section limit power range is as follows:

[0034] If P TL 1 is greater than P TL min 、PTL 1 The control quantity of the online emergency control strategy under is less than P TL 2 The control quantity of the online emergency control strategy under, the limit conservative transmission section power is P TL 2 ; where P TL 1 is the minimum value of the actual possible transmission section power interval within a short period, P TL 2 is the maximum value of the actual possible transmission section power interval within a short period, P TL min is the minimum value of the transmission section limit power interval;

[0035] If P TL 1 is greater than P TL min 、P TL 1 The control quantity of the online emergency control strategy under is not less than P TL 2 The control quantity of the online emergency control strategy under, the limit conservative transmission section power is P TL 1 ;

[0036] If P TL 1 is greater than P TL min , take the transmission section power with the minimum control quantity of the online emergency control strategy within (P TL 1 , P TL 2 ) as the limit optimistic transmission section power;

[0037] If P TL 1 is less than or equal to P TL min 、P TL 2 is greater than P TL min 、P TL min The control quantity of the online emergency control strategy under is less than P TL 2 The control quantity of the online emergency control strategy under, the limit conservative transmission section power is P TL 2 ;

[0038] If P TL 1 is less than or equal to P TL min 、PTL 2 Greater than P TL min , P TL min The control quantity of the online emergency control strategy below is not less than P TL 2 The control quantity of the online emergency control strategy below, and the power of the limit conservative transmission section is P TL min ;

[0039] If P TL 1 Less than or equal to P TL min , take the power of the transmission section with the smallest control quantity of the online emergency control strategy within (P TL min , P TL 2 ) as the power of the limit optimistic transmission section.

[0040] In the pre-binning module, the process of binning the control quantity of the online emergency control strategy within a short period according to the power of the limit conservative transmission section and the power of the limit optimistic transmission section within a short period is as follows:

[0041] If the difference between the control quantity corresponding to the power of the limit conservative transmission section and the control quantity corresponding to the power of the limit optimistic transmission section does not exceed P k , the control quantity of the online emergency control strategy within a short period is divided into one bin, and the output control quantity of one bin is f(P TL i ), and the power of the transmission section is located in [P TL i , P TL j ; where P k is the threshold of the binning unit, P TL i is the power of the limit conservative transmission section, P TL j is the power of the limit optimistic transmission section, and f(P TL i ) is the control quantity corresponding to the power of the limit conservative transmission section;

[0042] If the difference between the control quantity corresponding to the power of the limit conservative transmission section and the control quantity corresponding to the power of the limit optimistic transmission section is greater than or equal to (N - 1)P k and less than NP k , the control quantity of the online emergency control strategy within a short period is divided into N bins, and the output control quantity of the nth bin is f(P TL i ) - (n - 1)P k , and the power of the transmission section is located in [PTL (n-1)i , P TL ni ; where N≥2, n∈[1, N], P TL (n-1)i is the transmission section power corresponding to f(P TL i ) - (n - 1)P k ; P TL ni is the transmission section power corresponding to f(P TL i ) - nP k .

[0043] A computer-readable storage medium storing one or more programs, the one or more programs including instructions that, when executed by a computing device, cause the computing device to perform an online emergency control method.

[0044] A computing device, comprising one or more processors, one or more memories, and one or more programs, wherein the one or more programs are stored in the one or more memories and configured to be executed by the one or more processors, and the one or more programs include instructions for performing an online emergency control method.

[0045] Advantages achieved by the present invention: The present invention pre-divides control quantities for the online emergency control strategy within a short period. In the case of a predicted fault, the corresponding control quantity is directly matched through the transmission section power at the current moment, so that the online emergency control is not prone to mismatch, the control accuracy is finer, the matching is more accurate, and the adaptability is stronger. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 is a flowchart of the method of the present invention;

[0047] Figure 2 is a schematic diagram of the Qinghai power grid;

[0048] Figure 3 is the non-monotonic change of the control quantity with the section power;

[0049] Figure 4 is a comparison diagram of the influence of the method of the present invention and the traditional method on the post-fault voltage recovery. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0050] The present invention will be further described below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention and cannot be used to limit the protection scope of the present invention.

[0051] As Figure 1 shown, an online emergency control method includes:

[0052] Step 1: In response to detecting the occurrence of a predicted fault (i.e., the predicted fault actually occurs), obtain the power of the transmission section at the current moment.

[0053] Step 2: Obtain the control quantity corresponding to the power of the transmission section at the current moment under the predicted fault from the short-term online emergency control strategy with pre-divided control quantities.

[0054] The occurrence moment of the predicted fault is within the short period, and the short-term online emergency control strategy is the short-term online emergency control strategy under the predicted fault.

[0055] The process of pre-dividing the control quantities of the short-term online emergency control strategy is as follows:

[0056] 1) Determine the extremely conservative transmission section power and extremely optimistic transmission section power within the short period according to the power of the transmission section at the start moment of the short period and the transmission section limit power interval; among them, the extremely conservative transmission section power is the transmission section power corresponding to the maximum control quantity of the online emergency control strategy, and the extremely optimistic transmission section power is the transmission section power corresponding to the minimum control quantity of the online emergency control strategy.

[0057] 2) Divide the control quantities of the short-term online emergency control strategy within the short period according to the extremely conservative transmission section power and extremely optimistic transmission section power within the short period.

[0058] Step 3: Perform online emergency control using the control quantity corresponding to the power of the transmission section at the current moment.

[0059] The above method pre-divides the control quantities of the short-term online emergency control strategy. In the case of the occurrence of a predicted fault, the corresponding control quantity is directly matched through the power of the transmission section at the current moment, so that the online emergency control is not prone to mismatch, the control accuracy is finer, the matching is more accurate, and the adaptability is stronger.

[0060] The online emergency control strategy is based on the predicted fault. After dividing the control quantities of the online emergency control strategy and sending them to the device, when a predicted fault actually occurs after a certain period of time (generally within 5 minutes after the strategy is sent, and this 5 minutes is the short period), the device immediately performs mode matching on the mode at the fault occurrence moment and outputs the control quantity of the corresponding gear to trigger the generator tripping or load shedding action.

[0061] Before the actual occurrence of the predicted fault, the main process of dividing the control quantities can be as follows:

[0062] 1) Determine the extremely conservative transmission section power and extremely optimistic transmission section power within the short period according to the power of the transmission section at the start moment of the short period and the transmission section limit power interval.

[0063] By comprehensively applying the real-time data of EMS state estimation, the real-time data of WAMS, and the real-time data of the security and stability control system (abbreviation: security control system) in the dispatching center, the transmission section power at the starting moment of the short cycle is obtained. The limit power of the transmission section TL can be obtained by simulating and perturbing the generator outputs on both sides of the section. Since there are many different choices for the generator distribution method, there is an interval for the limit power of the transmission section.

[0064] The process of determining the limit conservative transmission section power and the limit optimistic transmission section power within the short cycle can be as follows:

[0065] S1) According to the transmission section power at the starting moment of the short cycle, calculate the actual possible transmission section power interval within the short cycle;

[0066] The minimum value of the actual possible transmission section power interval within the short cycle is the transmission section power at the starting moment of the short cycle minus 1 / 2 of the minute-level fluctuation range of the transmission section, which can be expressed by the formula: P TL 1 is the minimum value of the actual possible transmission section power interval within the short cycle, P TL 0 is the transmission section power at the starting moment of the short cycle, and ΔP k is the minute-level fluctuation range of the transmission section;

[0067] The maximum value of the actual possible transmission section power interval within the short cycle is the sum of the transmission section power at the starting moment of the short cycle and 1 / 2 of the minute-level fluctuation range of the transmission section, which can be expressed by the formula: P TL 2 is the maximum value of the actual possible transmission section power interval within the short cycle.

[0068] S2) According to the actual possible transmission section power interval within the short cycle and the limit power interval of the transmission section, determine the limit conservative transmission section power and the limit optimistic transmission section power within the short cycle.

[0069] Since the law of the section power affecting the transient stability control quantity is generally monotonically increasing or a concave function, and the limit case is when the section power is at the minimum or maximum value, it needs to be determined case by case. Specifically, it can be as follows:

[0070] A1) If P TL 1 is greater than P TL min and the control quantity of the on-line emergency control strategy under P TL 1 is less than the control quantity of the on-line emergency control strategy under P TL 2 the limit conservative transmission section power is PTL 2 ; where P TL min is the minimum value of the transmission section limit power range;

[0071] A2) If P TL 1 is greater than P TL min and the control amount of the online emergency control strategy under P TL 1 is not less than the control amount of the online emergency control strategy under P TL 2 , the limit conservative transmission section power is P TL 1 ;

[0072] A3) If P TL 1 is greater than P TL min , use the bisection method to take the power of the transmission section with the smallest control amount of the online emergency control strategy within (P TL 1 , P TL 2 ) as the limit optimistic transmission section power;

[0073] A4) If P TL 1 is less than or equal to P TL min and the control amount of the online emergency control strategy under P TL 2 is greater than P TL min and the control amount of the online emergency control strategy under P TL min is less than the control amount of the online emergency control strategy under P TL 2 , the limit conservative transmission section power is P TL 2 ;

[0074] A5) If P TL 1 is less than or equal to P TL min and the control amount of the online emergency control strategy under P TL 2 is greater than P TL min and the control amount of the online emergency control strategy under P TL min is not less than the control amount of the online emergency control strategy under P TL 2 , the limit conservative transmission section power is P TL min;

[0075] A6) If P TL 1 is less than or equal to P TL min , the power of the transmission section with the smallest control quantity of the online emergency control strategy within (P TL min , P TL 2 ) is used as the limit optimistic transmission section power.

[0076] 2) According to the limit conservative transmission section power and the limit optimistic transmission section power within the short period, the control quantity of the online emergency control strategy within the short period is divided into grades.

[0077] Taking the capacity of a single unit or the load power of a single site as the grading unit threshold, the over - cut is controlled within the load of one unit or one site.

[0078] If the difference between the control quantity corresponding to the limit conservative transmission section power and the control quantity corresponding to the limit optimistic transmission section power does not exceed P k , the control quantity of the online emergency control strategy within the short period is divided into one grade, and the output control quantity of one grade is f(P TL i ), and the transmission section power is located in [P TL i , P TL j ; where P k is the grading unit threshold, P TL i is the limit conservative transmission section power, P TL j is the limit optimistic transmission section power, and f(P TL i ) is the control quantity corresponding to the limit conservative transmission section power.

[0079] If the difference between the control quantity corresponding to the limit conservative transmission section power and the control quantity corresponding to the limit optimistic transmission section power is greater than or equal to (N - 1)P k and less than NP k , the control quantity of the online emergency control strategy within the short period is divided into N grades, and the output control quantity of the nth grade is f(P TL i )-(n - 1)P k , and the transmission section power is located in [P TL (n-1)i , P TL ni ; where N≥2, n∈[1,N], and P TL (n-1)i is for f(PTL i )-(n - 1)P k The corresponding transmission section power, P TL ni is f(P TL i ) - nP k The corresponding transmission section power;

[0080] Generally, the number of grades does not exceed 3, that is, N is at most 3. The following takes N = 2 and 3 as examples for illustration:

[0081] Definition: The limit conservative transmission section power P TL i , when the system is transiently unstable under the pre - fault condition, the control quantity for system stability is f(P TL i ), the limit optimistic transmission section power P TL j , when the system is transiently unstable under the pre - fault condition, the control quantity for system stability is f(P TL j ),

[0082] For the case of N = 2: When 2P k ≥ f(P TL i ) - f(P TL j ) ≥ P k , it is divided into two grades from high to low according to the control quantity. The first - grade control quantity is f(P TL i ), the lower limit of the transmission section power of this grade is P TL i , and the upper limit of the transmission section power is the transmission section power corresponding to when the control quantity is f(P TL i ) - P k , which is defined as P TL 1i . Then when the online transmission section power at the time of the pre - fault occurrence is in the interval [P TL i , P TL 1i ), the control quantity f(P TL i ) is output; The second - grade control quantity is f(P TL i ) - P k , the upper limit of the transmission section power of this grade is f(P TL j ), and the lower limit of the transmission section power of this grade is P TL 1i, then when the expected fault occurs, the online transmission section power is [P TL 1i ,P TL j ] interval, the output control quantity f(P TL i )-P k .

[0083] When N=3: In 3P k ≥f(P TL i )-f(P TL j )≥2P k In the case of , the strategy value is divided into three levels from high to low, and the first level control amount is f(P TL i ), the lower limit of the transmission section power of this gear is P TL i The upper limit of the power transmission section is the control quantity f(P TL i )-P k The corresponding transmission section power is defined as P TL 1i , then when the expected fault occurs, the online transmission section power is [P TL i ,P TL 1i ) interval, the output control quantity is f(P TL i ); the second gear control amount is f(P TL i )-P k The lower limit of the transmission section power of this gear is P TL 1i The upper limit of the power transmission section is the control quantity f(P TL i )-2P k The corresponding transmission section power is defined as P TL 2i , then when the expected fault occurs, the online transmission section power is [P TL 1i ,P TL 2i ) interval, the output control quantity is f(P TL i )-P k ; The third gear control amount is f(P TL i )-2P k The upper limit of the transmission section power of this gear is P TL j, the lower limit of the transmission section power for this gear is P TL 2i , then when the online transmission section power at the time of the pre-fault occurrence is in the range of [P TL 2i , P TL j , the output control quantity is f(P TL i ) - 2P k .

[0084] After the above grading is completed, through the issuance of the online emergency control strategy and the confirmation of its effectiveness, it is refreshed to the corresponding security and stability control device. When the security control device detects that the pre-fault actually occurs within a short period, the transmission section power at the current moment is obtained, and the corresponding control quantity is directly matched from the online emergency control strategy within the short period of the control quantity grading, and this control quantity is used for online emergency control.

[0085] Taking Figure 2 the Qinghai Power Grid shown as an example, at 10:00 am on a typical day in winter 2021, the online emergency control strategy in the Haixi area of Qinghai is characterized by the power of the Golmud section (the power grid connection of the Qaidam main transformer + 330 kV Bayan Line + 330 kV Wuzong Line), and the online emergency control strategy grading is carried out after the operation main transformer fails during the maintenance of the Qaidam (dual main transformer configuration) main transformer.

[0086] At 10 o'clock, the power of the Golmud section is 448 MW, the calculation time for the online emergency control strategy grading is 5 minutes, and the minimum value P TL min of the limit power of the Golmud section within 10 minutes is 182 MW, and the maximum value P TL max is 197 MW; the power fluctuation range from 10 o'clock to 10:10 is set according to 5% of the maximum power of the section, that is, the maximum fluctuation is 102 MW. The actual possible minimum value P TL 1 of the section power is 397 MW, and the maximum value P TL 2 is 499 MW. Both are greater than the limit power of the section. Therefore, emergency control measures need to be taken after the operation main transformer fails.

[0087] By calculating the online emergency control strategy, it can be known that when the operating power of the Golmud section is 397 MW, the emergency load shedding amount after the fault is 187 MW; when the section power is 499 MW, the emergency load shedding amount is 172 MW. That is: when the section power is 397 MW, it is the limit conservative mode;

[0088] Since the online emergency control strategy varies non-monotonically with the section power, by performing bisection perturbation within the section power fluctuation range of (397 - 499) MW, when the section power is 420 MW, the emergency load shedding reaches the minimum value of 170 MW, that is: when the section power is 420 MW, it is the limit optimistic mode.

[0089] The difference between the control quantity under the conservative condition and the control quantity under the optimistic condition is 17 MW. With a single-site load of 10 MW as the grading interval, the strategy is divided into two grades. For the control quantity of 177 MW in the second grade, simulation perturbation is carried out, and it is obtained that the section power is 410 MW at this time. The non-monotonic variation of the emergency control quantity with the section power is as Figure 3 shown. Then, for the online emergency control strategy grading Z under the condition of the overhaul of the Qaidam main transformer and the fault y of the operating main transformer with the Golmud section power of x, it can be:

[0090]

[0091] That is, after about 5 minutes of strategy calculation, two-grade control strategies are issued online at 10:05 to cope with the uncertain fluctuation of the section power within the range of 10:05 - 10:10. When the actual Golmud section power x is in the range of [397, 410) MW, 187 MW of load needs to be shed after the Qaidam main transformer fails; when the actual Golmud section power x is in the range of [410, 499] MW, 177 MW of load needs to be shed after the Qaidam main transformer fails.

[0092] Compared with the load shedding amount of 171 MW formulated only based on the Golmud section power of 448 MW at 10 o'clock, the adaptability is stronger, and the under-control risk is greatly reduced. If the actual Golmud section power is 400 MW from 10:05 to 10:10, according to the grading control strategy, 187 MW of load needs to be shed after the Golmud main transformer fails. The original online control strategy is to shed 171 MW of load, as Figure 4 can be seen. The above-mentioned method is more conducive to the voltage recovery after the fault.

[0093] The above method is based on the transient stability quantitative analysis theory. According to the degree of influence on the control strategy, the section power representing the key characteristics of the operation mode is divided into several value ranges, and the control quantity grading for adapting to the short-period power fluctuation of the operation mode is carried out. It can divide the power of the operation mode after the fault, and then match the corresponding control quantity, making the accuracy of online decision-making finer, the matching more accurate, and the adaptability stronger, which greatly promotes the engineering application of the large power grid online transient stability emergency control technology.

[0094] Based on the same technical solution, the present invention also discloses a corresponding software system, an online emergency control system, which is characterized by including:

[0095] The pre - grading module pre - grades the control quantities of the on - line emergency control strategy within a short period. The process is as follows: According to the power of the transmission section at the starting moment of the short period and the transmission section limit power interval, determine the extremely conservative transmission section power and the extremely optimistic transmission section power within the short period. Then, according to the extremely conservative transmission section power and the extremely optimistic transmission section power within the short period, conduct the grading of the control quantities of the on - line emergency control strategy within the short period; among them, the extremely conservative transmission section power is the transmission section power corresponding to the maximum control quantity of the on - line emergency control strategy, and the extremely optimistic transmission section power is the transmission section power corresponding to the minimum control quantity of the on - line emergency control strategy.

[0096] In the pre - grading module, the process of determining the extremely conservative transmission section power and the extremely optimistic transmission section power within the short period according to the power of the transmission section at the starting moment of the short period and the transmission section limit power interval is as follows:

[0097] Calculate the actual possible transmission section power interval within the short period according to the power of the transmission section at the starting moment of the short period; determine the extremely conservative transmission section power and the extremely optimistic transmission section power within the short period according to the actual possible transmission section power interval and the transmission section limit power interval within the short period; among them, the extremely conservative transmission section power is the transmission section power corresponding to the maximum control quantity of the on - line emergency control strategy, and the extremely optimistic transmission section power is the transmission section power corresponding to the minimum control quantity of the on - line emergency control strategy.

[0098] In the pre - grading module, the process of determining the extremely conservative transmission section power and the extremely optimistic transmission section power within the short period according to the actual possible transmission section power interval and the transmission section limit power interval within the short period is as follows:

[0099] If P TL 1 is greater than P TL min and the control quantity of the on - line emergency control strategy under P TL 1 is less than the control quantity of the on - line emergency control strategy under P TL 2 the extremely conservative transmission section power is P TL 2 ; among them, P TL 1 is the minimum value of the actual possible transmission section power interval within the short period, P TL 2 is the maximum value of the actual possible transmission section power interval within the short period, and P TL min is the minimum value of the transmission section limit power interval;

[0100] If P TL 1 is greater than PTL min , P TL 1 The control quantity of the online emergency control strategy under... is not less than P TL 2 The control quantity of the online emergency control strategy under..., and the power of the extremely conservative transmission section is P TL 1 ;

[0101] If P TL 1 is greater than P TL min , take the power of the transmission section with the smallest control quantity of the online emergency control strategy within (P TL 1 , P TL 2 ) as the power of the extremely optimistic transmission section;

[0102] If P TL 1 is less than or equal to P TL min , P TL 2 is greater than P TL min , P TL min and the control quantity of the online emergency control strategy under... is less than P TL 2 The control quantity of the online emergency control strategy under..., and the power of the extremely conservative transmission section is P TL 2 ;

[0103] If P TL 1 is less than or equal to P TL min , P TL 2 is greater than P TL min , P TL min and the control quantity of the online emergency control strategy under... is not less than P TL 2 The control quantity of the online emergency control strategy under..., and the power of the extremely conservative transmission section is P TL min ;

[0104] If P TL 1 is less than or equal to P TL min , take (P TL min , P TL 2The power of the transmission section with the smallest control amount of the in-line emergency control strategy is used as the limit optimistic transmission section power.

[0105] In the pre-grading module, the process of grading the control amount of the in-line emergency control strategy within a short period according to the limit conservative transmission section power and the limit optimistic transmission section power within a short period is as follows:

[0106] If the difference between the control amount corresponding to the limit conservative transmission section power and the control amount corresponding to the limit optimistic transmission section power does not exceed P k , the control amount of the in-line emergency control strategy within a short period is divided into one grade, and the output control amount of one grade is f(P TL i ), and the transmission section power is located in [P TL i , P TL j ; where P k is the grading unit threshold, P TL i is the limit conservative transmission section power, P TL j is the limit optimistic transmission section power, and f(P TL i ) is the control amount corresponding to the limit conservative transmission section power;

[0107] If the difference between the control amount corresponding to the limit conservative transmission section power and the control amount corresponding to the limit optimistic transmission section power is greater than or equal to (N - 1)P k and less than NP k , the control amount of the in-line emergency control strategy within a short period is divided into N grades, and the output control amount of the nth grade is f(P TL i ) - (n - 1)P k , and the transmission section power is located in [P TL (n-1)i , P TL ni ; where N ≥ 2, n ∈ [1, N], P TL (n-1)i is the transmission section power corresponding to f(P TL i ) - (n - 1)P k , and P TL ni is the transmission section power corresponding to f(P TL i ) - nP k .

[0108] The current section power acquisition module, in response to detecting the occurrence of a pre-fault, acquires the transmission section power at the current moment.

[0109] A corresponding control quantity acquisition module acquires a control quantity corresponding to the power of a transmission section at the current moment under a pre-imagined fault from an on-line emergency control strategy with pre-controlled quantity grading in a short period; wherein, the occurrence moment of the pre-imagined fault is within the short period.

[0110] A control module performs on-line emergency control by using the control quantity corresponding to the power of the transmission section at the current moment.

[0111] Based on the same calculation scheme, the present invention also discloses a computer-readable storage medium storing one or more programs, the one or more programs including instructions that, when executed by a computing device, cause the computing device to execute the on-line emergency control method.

[0112] Based on the same calculation scheme, the present invention also discloses a computing device including one or more processors, one or more memories, and one or more programs, wherein the one or more programs are stored in the one or more memories and configured to be executed by the one or more processors, and the one or more programs include instructions for executing the on-line emergency control method.

[0113] Those skilled in the art should understand that the embodiments of the present invention can be provided as a method, a system, or a computer program product. Therefore, the present invention can adopt the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present invention can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk memories, CD-ROMs, optical memories, etc.) containing computer-usable program codes.

[0114] The present invention is described with reference to the flowcharts and / or block diagrams of methods, apparatuses (systems), and computer program products according to embodiments of the present invention. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, and the combination of flows and / or blocks in the flowcharts and / or block diagrams, can be realized by computer program instructions. These computer program instructions can be provided to the processors of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, so that the instructions executed by the processors of the computer or other programmable data processing devices generate means for realizing the functions specified in Figure 1 one process or multiple processes and / or blocks Figure 1 one block or multiple blocks.

[0115] These computer program instructions can also be stored in a computer-readable memory capable of guiding a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable memory generate a manufactured article including an instruction device, and the instruction device realizes the functions in the processFigure 1 one process or multiple processes and / or blocks Figure 1 the functions specified in one block or multiple blocks

[0116] These computer program instructions can also be loaded onto a computer or other programmable data processing device, so that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process. Thus, the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one process Figure 1 one process or multiple processes and / or blocks Figure 1 the steps of the functions specified in one block or multiple blocks

[0117] The above are only embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention are included within the scope of the claims of the present invention pending approval of the application

Claims

1. An online emergency control method, characterized in that, Including: In response to detecting the occurrence of a predicted fault, obtain the power of the transmission section at the current moment; From the short-term online emergency control strategy with pre-divided control quantities, obtain the control quantity corresponding to the power of the transmission section at the current moment under the predicted fault; wherein, the occurrence moment of the predicted fault is within the short period, and the process of pre-dividing the control quantities of the short-term online emergency control strategy is as follows: According to the power of the transmission section at the starting moment of the short period, calculate the actual possible power range of the transmission section within the short period, and according to the actual possible power range of the transmission section within the short period and the limit power range of the transmission section, determine the limit conservative power of the transmission section and the limit optimistic power of the transmission section within the short period, and according to the limit conservative power of the transmission section and the limit optimistic power of the transmission section within the short period, conduct the division of the control quantities of the short-term online emergency control strategy; the limit conservative power of the transmission section is the power of the transmission section corresponding to the maximum control quantity of the online emergency control strategy, and the limit optimistic power of the transmission section is the power of the transmission section corresponding to the minimum control quantity of the online emergency control strategy; Adopt the control quantity corresponding to the power of the transmission section at the current moment to conduct online emergency control; The above-mentioned determination of the limit conservative power of the transmission section and the limit optimistic power of the transmission section within the short period according to the actual possible power range of the transmission section within the short period and the limit power range of the transmission section includes: If P TL 1 is greater than P TL min and the control quantity of the online emergency control strategy below P TL 1 is less than the control quantity of the online emergency control strategy below P TL 2 the limit conservative transmission section power is P TL 2 ; where P TL 1 is the minimum value of the actual possible transmission section power interval in the short period, P TL 2 is the maximum value of the actual possible transmission section power interval in the short period, and P TL min is the minimum value of the transmission section limit power interval; If P TL 1 is greater than P TL min , the control quantity of the online emergency control strategy under P TL 1 is not less than the control quantity of the online emergency control strategy under P TL 2 , and the power of the extreme conservative transmission section is P TL 1 ; If P TL 1 is greater than P TL min , take the power of the transmission section with the smallest on-line emergency control strategy control amount within (P TL 1 , P TL 2 ) as the limit optimistic transmission section power; If P TL 1 less than or equal to P TL min 、P TL 2 greater than P TL min 、P TL min the control quantity of the online emergency control strategy below is less than P TL 2 the control quantity of the online emergency control strategy below, and the power of the extreme conservative transmission section is P TL 2 ; If P TL 1 less than or equal to P TL min 、P TL 2 greater than P TL min 、P TL min the control quantity of the online emergency control strategy below is not less than P TL 2 the control quantity of the online emergency control strategy below, and the power of the limit conservative transmission section is P TL min ; If P TL 1 is less than or equal to P TL min , the power of the transmission section with the smallest online emergency control strategy control quantity within (P TL min , P TL 2 ) is taken as the limit optimistic transmission section power; The above-mentioned division of the control quantities of the short-term online emergency control strategy according to the limit conservative power of the transmission section and the limit optimistic power of the transmission section within the short period includes: If the difference between the control quantity corresponding to the power of the extremely conservative transmission section and the control quantity corresponding to the power of the extremely optimistic transmission section does not exceed P k , the control quantity of the online emergency control strategy within a short period is divided into one gear, and the output control quantity of one gear is f(P TL i ), and the transmission section power is located in [P TL i , P TL j ; where P k is the threshold of the grading unit, P TL i is the power of the extremely conservative transmission section, P TL j is the power of the extremely optimistic transmission section, and f(P TL i ) is the control quantity corresponding to the power of the extremely conservative transmission section; If the difference between the control quantity corresponding to the power of the extremely conservative transmission section and the control quantity corresponding to the power of the extremely optimistic transmission section is greater than or equal to (N - 1)P k and less than NP k , the control quantity of the online emergency control strategy is divided into N gears within a short period. The output control quantity of the nth gear is f(P TL i ) - (n - 1)P k , and the transmission section power is located in [P TL (n-1)i , P TL ni ; where N ≥ 2, n ∈ [1, N], and P TL (n-1)i is the transmission section power corresponding to f(P TL i ) - (n - 1)P k , and P TL ni is the transmission section power corresponding to f(P TL i ) - nP k .

2. The on-line emergency control method according to claim 1, characterized in that The minimum value of the actual possible power range of the transmission section within the short period is the power of the transmission section at the starting moment of the short period minus 1 / 2 of the minute-level fluctuation range of the transmission section; The maximum value of the actual possible power range of the transmission section within the short period is the sum of the power of the transmission section at the starting moment of the short period and 1 / 2 of the minute-level fluctuation range of the transmission section.

3. An online emergency control system, characterized in that, Including: A pre-division module that pre-divides the control quantities of the short-term online emergency control strategy. The process is as follows: According to the power of the transmission section at the starting moment of the short period, calculate the actual possible power range of the transmission section within the short period, and according to the actual possible power range of the transmission section within the short period and the limit power range of the transmission section, determine the limit conservative power of the transmission section and the limit optimistic power of the transmission section within the short period, and according to the limit conservative power of the transmission section and the limit optimistic power of the transmission section within the short period, conduct the division of the control quantities of the short-term online emergency control strategy; wherein, the limit conservative power of the transmission section is the power of the transmission section corresponding to the maximum control quantity of the online emergency control strategy, and the limit optimistic power of the transmission section is the power of the transmission section corresponding to the minimum control quantity of the online emergency control strategy; A current section power acquisition module that, in response to detecting the occurrence of a predicted fault, obtains the power of the transmission section at the current moment; A corresponding control quantity acquisition module that obtains the control quantity corresponding to the power of the transmission section at the current moment under the predicted fault from the short-term online emergency control strategy with pre-divided control quantities; wherein, the occurrence moment of the predicted fault is within the short period; A control module that adopts the control quantity corresponding to the power of the transmission section at the current moment to conduct online emergency control; In the above-mentioned pre-rating module, the process of determining the ultimate conservative transmission section power and the ultimate optimistic transmission section power within a short period according to the actual possible transmission section power range and the transmission section limit power range within a short period is as follows: If P TL 1 is greater than P TL min and the control amount of the online emergency control strategy under P TL 1 is less than the control amount of the online emergency control strategy under P TL 2 the limit conservative transmission section power is P TL 2 ; where P TL 1 is the minimum value of the actual possible transmission section power interval within a short period, P TL 2 is the maximum value of the actual possible transmission section power interval within a short period, and P TL min is the minimum value of the transmission section limit power interval; If P TL 1 is greater than P TL min and the control quantity of the online emergency control strategy under P TL 1 is not less than the control quantity of the online emergency control strategy under P TL 2 and the limit conservative transmission section power is P TL 1 ; If P TL 1 is greater than P TL min , the power of the transmission section with the smallest online emergency control strategy control quantity within (P TL 1 , P TL 2 ) is used as the limit optimistic transmission section power; If P TL 1 less than or equal to P TL min 、P TL 2 greater than P TL min 、P TL min the control quantity of the online emergency control strategy below is less than P TL 2 the control quantity of the online emergency control strategy below, and the power of the extreme conservative transmission section is P TL 2 ; If P TL 1 is less than or equal to P TL min 、P TL 2 is greater than P TL min 、P TL min the control quantity of the online emergency control strategy under is not less than P TL 2 the control quantity of the online emergency control strategy under, and the power of the limit conservative transmission section is P TL min ; If P TL 1 is less than or equal to P TL min , the power of the transmission section with the smallest on-line emergency control strategy control quantity within (P TL min , P TL 2 ) is used as the limit optimistic transmission section power; In the above-mentioned pre-rating module, the process of performing the on-line emergency control strategy control quantity rating within a short period according to the ultimate conservative transmission section power and the ultimate optimistic transmission section power within a short period is as follows: If the difference between the control quantity corresponding to the power of the extremely conservative transmission section and the control quantity corresponding to the power of the extremely optimistic transmission section does not exceed P k , the control quantity of the on-line emergency control strategy within a short period is divided into one gear, and the output control quantity of one gear is f(P TL i ), and the power of the transmission section is located in [P TL i , P TL j ; where P k is the threshold of the grading unit, P TL i is the power of the extremely conservative transmission section, P TL j is the power of the extremely optimistic transmission section, and f(P TL i ) is the control quantity corresponding to the power of the extremely conservative transmission section; If the difference between the control quantity corresponding to the limit conservative transmission section power and the control quantity corresponding to the limit optimistic transmission section power is greater than or equal to (N - 1)P k and less than NP k , the control quantity of the on-line emergency control strategy is divided into N gears within a short period, and the output control quantity of the nth gear is f(P TL i ) - (n - 1)P k , and the transmission section power is located in [P TL (n-1)i , P TL ni ; where N ≥ 2, n ∈ [1, N], P TL (n-1)i is the transmission section power corresponding to f(P TL i ) - (n - 1)P k , and P TL ni is the transmission section power corresponding to f(P TL i ) - nP k .

4. An online emergency control system according to claim 3, characterized in that, In the pre-rating module, the minimum value of the actual possible transmission section power range within a short period is the transmission section power at the start time of the short period minus 1 / 2 of the minute-level fluctuation range of the transmission section, and the maximum value of the actual possible transmission section power range within a short period is the sum of the transmission section power at the start time of the short period and 1 / 2 of the minute-level fluctuation range of the transmission section.

5. A computer-readable storage medium storing one or more programs, characterized in that, The one or more programs include instructions that, when executed by a computing device, cause the computing device to perform any of the methods according to claims 1 to 2.

6. A computing device, characterized in that, Comprising: One or more processors, one or more memories, and one or more programs, wherein the one or more programs are stored in the one or more memories and configured to be executed by the one or more processors, and the one or more programs include instructions for performing any of the methods according to claims 1 to 2.

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