Early warning method, device and electronic equipment for generator power operation limit

Abstract

The present invention discloses a method for warning of the operating limit of a generator power, belonging to the field of on-line monitoring of power systems. The method includes: discretizing the line segments or curves constituting the operating limit boundary of the generator power into a series of boundary points respectively, and forming a discrete operating limit boundary with the polygon composed of each boundary point; collecting the active power and reactive power data of the generator at the current moment in real time; judging whether the operating point represented by the active power and reactive power of the generator at the current moment is outside the discrete operating limit boundary, and if it is outside the discrete operating limit boundary, a power warning is issued. By discretizing the operating limit boundary, this solution makes it easy and accurate to judge whether the generator power exceeds the limit, has strong applicability, and can realize real-time monitoring and early warning of the generator power exceeding the limit.

Description

Technical Field

[0001] The present invention belongs to the field of on-line monitoring of power systems, and particularly relates to a warning method, device and electronic equipment for the power operation limit of a synchronous generator. Background Art

[0002] With the rapid development of the power system, the electricity demand has increased rapidly, and the power load of the power grid has continuously reached new highs, causing the generator sets in some areas to operate near the rated conditions for a long time. Once the generator operates overloaded, it is easy to cause the temperature to be too high and the insulation to age, affecting the service life of the unit. When the power grid is disturbed, the generator is required to provide reactive power support to the system and operate in the leading power factor mode. If the leading power factor operation is too deep, it will cause the generator to lose excitation, expand the scope of the accident, and even lead to local instability. Therefore, the generator faces various complex operating conditions, and the generator power warning technology must also comprehensively consider different conditions.

[0003] In the prior art, the excitation control system of the generator usually targets the over-excitation or under-excitation state of the generator. When the power exceeds the limit operation boundary, it delays the action on the excitation control to perform excitation increase or decrease operations. However, the excitation limit cannot issue a warning when the generator power is about to exceed the limit, and it adjusts the excitation after a certain delay after the power exceeds the limit. At this time, the heating effect caused by the over-limit power has already affected the stator and rotor, and in severe cases, it is easy to cause the aging and damage of their insulation.

[0004] Therefore, it is necessary to study a general warning method for the power operation limit of the generator, which issues a warning signal when the generator power is close to the power operation limit, timely reminds the power plant operation and maintenance and dispatching personnel, and prevents the power from further developing in the over-limit direction and causing damage to the unit. Summary of the Invention

[0005] To solve the above problems, the present application proposes a warning method for the power operation limit of a generator, which timely issues a warning signal when the generator power is close to the power operation limit.

[0006] Therefore, it is necessary to study a general warning method for the power operation limit of the generator, which issues a warning signal when the generator power is close to the power operation limit, timely reminds the power plant operation and maintenance and dispatching personnel, and prevents the power from further developing in the over-limit direction and causing damage to the unit.

[0007] To achieve the above object, the present application adopts the following technical solutions:

[0008] The first aspect of the present application proposes a warning method for the power operation limit of a generator, including the following steps:

[0009] Step (1): Discretize the line segments or curves that constitute the power operation limit boundary of the generator into a series of boundary points respectively, and form a polygon composed of these boundary points to constitute the discrete operation limit boundary S 极 ;

[0010] Step (2): Collect the active power and reactive power data of the generator at the current moment in real time, denoted as P0 and Q0;

[0011] Step (3): Determine whether the operating point represented by the active power and reactive power of the generator at the current moment is outside the discrete operation limit boundary. If it is outside the discrete operation limit boundary, a power warning is issued.

[0012] According to some embodiments, step (2) further includes: saving the historical data of the active power and reactive power of the generator within a preset time length; using a data anomaly discrimination method to determine whether the active power and reactive power of the generator at the current moment are abnormal data. If they are abnormal data, the discrimination of the power warning is ended; otherwise, step (3) is entered.

[0013] According to some embodiments, in step (1), the power operation limit boundary of the generator is a closed figure S(L1, L2,..., L n ), where L1, L2,..., L n respectively represent the line segments or curves that make up the operation limit boundary;

[0014] Discretize each line segment or curve into multiple points respectively, and obtain the boundary points p 1,1 , p 1,2 , …, p 1,k1 , p 2,1 , p 2,2 , …, p 2,k2 , …, p n,1 , p n,2 , …, p n,kn ; where: p 1,1 , p 1,2 , …, p 1,k1 represent the points corresponding to the curve L1, p 2,1 , p 2,2 , …, p 2,k2 represent the points corresponding to the curve L2, p n,1 , p n,2 , …, p n,kn represent the points corresponding to the curve L n respectively. Connect these discretized boundary points in sequence end to end to form a polygon S representing the discrete operation limit boundary of the generator power 极 .

[0015] According to some embodiments, the method for determining the operating limit boundary of the generator power in step (1) includes:

[0016] Determine the actual operating curve according to the actual generator parameters;

[0017] Multiply the actual operating curve by a proportionality coefficient as the warning boundary range, and the proportionality coefficient is taken as 80% - 95%.

[0018] According to some embodiments, the preset time length of the historical data is 1 - 5 minutes, and the acquisition time interval is 3 - 5 seconds.

[0019] According to some embodiments, step (2) specifically includes:

[0020] Step (2.1), collect the active power and reactive power at the current moment in real time, denoted as P0 and Q0 respectively, and save the historical data of active power and reactive power, denoted as {P1, P2,..., P m} and {Q1, Q2,..., Q m},

[0021] Step (2.2), calculate the standard deviation σ P of the historical data of active power and the standard deviation σ Q of the historical data of reactive power:

[0022]

[0023] where and are the average value of the historical data of active power and the average value of the historical data of reactive power respectively:

[0024]

[0025] Step (2.3), if the active power P0 or reactive power Q0 at the current moment does not satisfy the following conditions:

[0026]

[0027] Then it is considered that the sampling data at the current moment is abnormal data, and the discrimination of power warning is ended, otherwise step (3) is entered.

[0028] According to some embodiments, the method for determining whether the operating point represented by the active power and reactive power of the generator at the current moment is outside the operating limit discrete boundary in step (3) is: Denote the two-dimensional point (P0, Q0) represented by the active power and reactive power of the generator at the current moment as p0. First, determine whether the active power and reactive power point p0 of the generator at the current moment coincides with the boundary points forming S 极 or p0 is within the boundary points forming S极 on a certain side of the polygon; if so, it is considered that p0 is within the running limit discrete boundary, denoted as p0 ∈ S 极 , otherwise for p0 and S 极 sum the angles between p0 and all adjacent boundary points on S, and determine whether p0 is outside the running limit discrete boundary based on the sum of the angles. If so, issue a power warning.

[0029] According to some embodiments, the step of summing the angles between p0 and all adjacent boundary points on S 极 and determining whether p0 is outside the running limit discrete boundary based on the sum of the angles, and if so, issuing a power warning, specifically includes:

[0030] Number the boundary points sequentially, and denote the angle ∠p j p0p j+1 between p0 and adjacent boundary points p j as θ j+1 ; the angle is positive if it is counterclockwise and negative if it is clockwise, or the angle is negative if it is counterclockwise and positive if it is clockwise; j When the angle is positive for counterclockwise and negative for clockwise, if the sum of all angles satisfies the following condition, it indicates that p0 ∈ S

[0031] : 极 ∑θ

[0032] = 360° ± ε Equation (4) j When the angle is negative for counterclockwise and positive for clockwise, if the sum of all angles satisfies the following condition, it indicates that p0 ∈ S

[0033] : 极 ∑θ

[0034] = -360° ± ε Equation (5) j If the sum of all angles satisfies the following condition, then p0 is outside the running limit discrete boundary, and a power warning is issued:

[0035] ∑θ

[0036] = 0° ± ε Equation (6) j where ε represents the calculation error.

[0037] According to some embodiments, the step of summing the angles between p0 and all adjacent boundary points on S

[0038] and determining whether p0 is outside the running limit discrete boundary based on the sum of the angles, and if so, issuing a power warning, specifically includes: 极 Number the boundary points sequentially, and denote the angle between p0 and adjacent boundary points p

[0039] as θ j and pj+1 The included angle ∠p j p0p j+1 is denoted as θ j ; if the included angle is counterclockwise, it is positive; if the included angle is clockwise, it is negative, or if the included angle is counterclockwise, it is negative; if the included angle is clockwise, it is positive;

[0040] If the sum of all included angles satisfies the following conditions, then p0 is outside the discrete boundary of the operating limit, and a power warning is issued; otherwise, it is considered that p0 ∈ S 极 :

[0041] ∑θ j = 0° ± ε Equation (6)

[0042] where ε represents the calculation error.

[0043] The second aspect of the present application proposes a warning device for the operating limit of generator power, including:

[0044] A discrete boundary calculation unit, configured to discretize the line segments or curves constituting the operating limit boundary of the generator power into a series of boundary points respectively, and form a polygon composed of each boundary point to form the discrete boundary S of the operating limit 极 ;

[0045] A data acquisition unit, configured to collect the active power and reactive power data of the generator at the current moment in real time, denoted as P0 and Q0;

[0046] A judgment unit, configured to judge whether the operating point represented by the active power and reactive power of the generator at the current moment is outside the discrete boundary of the operating limit. If it is outside the discrete boundary of the operating limit, a power warning is issued.

[0047] According to some embodiments, the data acquisition unit further includes: saving the historical data of the active power and reactive power of the generator within a preset time length; using a data anomaly discrimination method to judge whether the active power and reactive power of the generator at the current moment are abnormal data. If they are abnormal data, the discrimination of the power warning is ended; otherwise, it enters the judgment unit.

[0048] The third aspect of the present application proposes an electronic device, including: a processor; and a memory storing computer instructions, when the computer instructions are executed by the processor, enabling the processor to execute the warning method for the operating limit of generator power described above.

[0049] The fourth aspect of the present application proposes a non-transitory computer storage medium, storing a computer program, when the computer program is executed by multiple processors, enabling the processors to execute the warning method for the operating limit of generator power described above.

[0050] Compared with the prior art, the beneficial effects of the present application are as follows:

[0051] (1) This method is a warning method based on the boundary of the two-dimensional power graph, which realizes the comprehensive warning of different working conditions of the complete power limit boundary, avoids omissions in some working conditions, and has the ability of early warning compared with the method of power limitation after over-limit such as excitation limitation;

[0052] (2) The power limit boundary is generally composed of continuous curves, which is not easy to be analyzed and processed by a computer. After discretizing the boundary, it is convenient for the real-time analysis of the power warning system and timely warning of power over-limit. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 is a schematic flowchart of a warning method for the operating limit of a generator power provided by an embodiment of the present application;

[0054] Figure 2 is a schematic flowchart of another warning method for the operating limit of a generator power provided by an embodiment of the present application;

[0055] Figure 3 is a schematic diagram of the operating limit boundary of a generator power in a preferred embodiment of the present invention;

[0056] Figure 4 is a schematic diagram of the discretized operating limit boundary in a preferred embodiment of the present invention;

[0057] Figure 5 is a schematic structural diagram of a warning device for the operating limit of a generator power provided by an embodiment of the present application;

[0058] Figure 6 is a structural diagram of an electronic device provided by the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0059] In order to clearly illustrate the method proposed by the present invention, the following will elaborate on the specific embodiments of the present invention in detail with reference to the accompanying drawings.

[0060] Figure 1 Shown is a schematic flowchart of a warning method for the operating limit of a generator power provided by an embodiment of the present application, including the following steps:

[0061] S100, discretize the line segments or curves constituting the operating limit boundary of the generator power into a series of boundary points respectively, and form a polygon composed of each boundary point to form an operating limit discrete boundary S 极 .

[0062] The specific implementation method is as follows: The operating limit boundary of the generator power is a closed graph S (L1, L2,..., L n), where L1, L2, …, L n respectively represent the respective line segments or curves that make up the operating limit boundary. Each line segment or curve is discretized into multiple points to obtain boundary points p 1,1 , p 1,2 , …, p 1,k1 , p 2,1 , p 2,2 , …, p 2,k2 , …, p n,1 , p n,2 , …, p n,kn ; where: p 1,1 , p 1,2 , …, p 1,k1 represents the points corresponding to curve L1, p 2,1 , p 2,2 , …, p 2,k2 represents the points corresponding to curve L2, p n,1 , p n,2 , …, p n,kn represents the points corresponding to curve L n . Connect these discretized boundary points in sequence end to end to form a polygon S 极 that represents the discrete boundary of the operating limit of the generator power.

[0063] S200, real-time collect the active power and reactive power data of the generator at the current moment, denoted as P0 and Q0;

[0064] S300, determine whether the operating point represented by the active power and reactive power of the generator at the current moment is outside the discrete boundary of the operating limit. If it is outside the discrete boundary of the operating limit, a power warning is issued.

[0065] In some embodiments, the specific determination process includes: Denote the two-dimensional point (P0, Q0) represented by the active power and reactive power of the generator at the current moment as p0. First, determine whether the active power and reactive power point p0 of the generator at the current moment coincides with the boundary points that make up S 极 or p0 is on a certain side of the polygon that makes up S 极 ; If so, it is considered that p0 is within the discrete boundary of the operating limit, denoted as p0 ∈ S 极 , otherwise, sum the angles between p0 and all adjacent boundary points on S 极 , and determine whether p0 is outside the discrete boundary of the operating limit based on the sum of the angles. If so, a power warning is issued.

[0066] In some embodiments, the specific implementation method of summing the angles between p0 and all adjacent boundary points on S 极 and determining whether p0 is outside the discrete boundary of the operating limit based on the sum of the angles, and issuing a power warning if so, includes:

[0067] Number the boundary points sequentially. Denote the included angle ∠p j between p0 and two adjacent boundary points p j+1 and p j as θ j+1 0p j ; the included angle is positive when it is counterclockwise and negative when it is clockwise, or the included angle is negative when it is counterclockwise and positive when it is clockwise;

[0068] When the included angle is positive when it is counterclockwise and negative when it is clockwise, if the sum of all included angles satisfies the following condition, it indicates that p0 ∈ S 极 :

[0069] Σθ j = 360° ± ε Equation (4)

[0070] When the included angle is negative when it is counterclockwise and positive when it is clockwise, if the sum of all included angles satisfies the following condition, it indicates that p0 ∈ S 极 :

[0071] Σθ j = -360° ± ε Equation (5)

[0072] If the sum of all included angles satisfies the following condition, then p0 is outside the discrete boundary of the operating limit, and a power warning is issued:

[0073] ∑θ j = 0° ± ε Equation (6)

[0074] where ε represents the calculation error. The value range of the calculation error is 0 to 5°. In this embodiment, different criteria are used to determine whether the sum of the included angles belongs to outside or inside the discrete boundary of the operating limit, and the determination is more accurate.

[0075] In some embodiments, the specific implementation method of summing the included angles between p0 and all adjacent boundary points on S 极 and determining whether p0 is outside the discrete boundary of the operating limit based on the sum of the included angles and issuing a power warning if so includes:

[0076] Number the boundary points sequentially. Denote the included angle ∠p j between p0 and two adjacent boundary points p j+1 and p j as θ j+1 0p j ; the included angle is positive when it is counterclockwise and negative when it is clockwise, or the included angle is negative when it is counterclockwise and positive when it is clockwise;

[0077] If the sum of all included angles satisfies the following condition, then p0 is outside the discrete boundary of the operating limit, and a power warning is issued; otherwise, it is considered that p0 ∈ S 极 :

[0078] Σθ j = 0° ± ε Equation (6)

[0079] where ε represents the calculation error. The value range of the calculation error is 0 to 5°. In this embodiment, whether the sum of the included angles is outside the discrete boundary of the operating limit or within the discrete boundary of the operating limit is determined by a single criterion, and the condition is simpler.

[0080] In some embodiments, the method for determining the operating limit boundary of the generator power includes: determining the actual operating curve according to the actual generator parameters; multiplying the actual operating curve by a proportionality coefficient as the warning boundary range, and the proportionality coefficient takes 80% to 95%.

[0081] In some embodiments, the process of data anomaly discrimination is further included in step S200: saving the historical data of the active power and reactive power of the generator within a preset time length; using the data anomaly discrimination method to determine whether the active power and reactive power of the generator at the current moment are abnormal data. If they are abnormal data, the discrimination of the power warning is ended; otherwise, step S300 is entered. Among them, the preset time length of the historical data is 1 to 5 minutes, and the acquisition time interval is 3 to 5 seconds. This method uses the historical data within a period of time to perform abnormal data analysis on the data at the current moment, can eliminate abnormal sampling data, and effectively prevent false alarms caused by abnormal sampling.

[0082] In some embodiments, step S200 specifically includes:

[0083] S201, real-time collect the active power and reactive power at the current moment, denoted as P0 and Q0 respectively, and save the historical data of the active power and reactive power, denoted as {P1, P2,..., P m} and {Q1, Q2,..., Q m},

[0084] S202, calculate the standard deviation σ P of the historical data of the active power and the standard deviation σ Q of the historical data of the reactive power:

[0085]

[0086] where and are the average value of the historical data of the active power and the average value of the historical data of the reactive power respectively:

[0087]

[0088] S203, if the active power P0 or the reactive power Q0 at the current moment does not satisfy the following conditions:

[0089]

[0090] Then it is considered that the sampling data at the current moment is abnormal data, and the discrimination of power warning is ended. Otherwise, go to step S300.

[0091] The warning method for the operating limit of the generator power proposed in this application takes into comprehensive consideration of different working conditions and has strong applicability. Now, taking a 600MW steam turbine generator set in a domestic power plant as an example, the specific implementation method will be described in detail. The method flow chart is as Figure 2 shown.

[0092] The rated power of the generator is 600MW, the rated power factor is 0.90, the rated voltage is 20kV, the per-unit value of the direct-axis unsaturated synchronous reactance is 2.155, the per-unit value of the direct-axis unsaturated transient reactance is 0.301, and the per-unit value of the connection impedance with the system is 0.20. Through the above generator parameters, the operating limit boundary of the generator power can be represented by line segment L1, curve L2, curve L3, and curve L4, as Figure 3 shown. Among them, L1 is the inverse power boundary, L2 is the rotor heating limit boundary, L3 is the stator heating limit boundary, and L4 is the static stability limit boundary.

[0093] First, Figure 3 each line segment or curve from L1 to L4 in the operating limit boundary is discretized into multiple boundary points respectively, forming the operating limit discrete boundary as Figure 4 shown. Each boundary point is numbered counterclockwise, and the coordinates of each point are shown in Table 1. For the convenience of display, in this embodiment, each boundary is only evenly discretized into 5 boundary points including its head and tail endpoints. In the actual application process, the more boundary points are discretized, the higher the calculation accuracy.

[0094] Table 1 Coordinates of the operating limit boundary points

[0095] Serial number Active power (MW) Reactive power (MVar) Serial number Active power (MW) Reactive power (MVar) 1 0 -309.33 9 600 290.59 2 0 -97.27 10 643.49 174.25 3 0 114.87 11 664.65 51.85 4 0 327.0 12 662.73 -72.35 5 0 539.13 13 637.81 -194.03 6 165.54 522.83 14 482.87 -244.18 7 324.72 474.54 15 324.07 -280.29 8 471.42 396.12 16 162.69 -302.08

[0096] Then, the active power and reactive power data of the generator at the current moment are collected in real time, and the historical active power and reactive power data of the generator within a preset time length are saved. In order to verify the effectiveness of the method by comparison, two sets of current active power and reactive power data and the historical active power and reactive power data within the previous 1 minute are obtained respectively. The sampling time interval is 3 seconds. The two sets of data obtained are shown in Table 2 and Table 3 respectively, where the data with the serial number 0 represents the data at the current moment.

[0097] The first group of active power and reactive power data collected in Table 2

[0098] Serial number Active power (MW) Reactive power (MVar) Serial number Active power (MW) Reactive power (MVar) 0 330.61 121.7 10 316.89 121.88 1 304.8 125.86 11 318.05 129.24 2 303.96 129.47 12 318.34 120.73 3 306.14 127.4 13 320.44 121.54 4 307.08 128.84 14 321.3 124.19 5 307.39 122.82 15 321.63 128.63 6 308.33 124.06 16 322.78 123.45 7 308.89 126.66 17 324.96 126.72 8 310.79 120.83 18 328.07 128.16 9 314.17 123.21 19 328.33 124.32

[0099] The second group of active power and reactive power data collected in Table 3

[0100] Serial number Active power (MW) Reactive power (MVar) Serial number Active power (MW) Reactive power (MVar) 0 605.19 296.06 10 588.3 290.3 1 581.35 280.93 11 590.08 289.49 2 581.37 281.64 12 592.49 292.89 3 582.2 281.46 13 591.74 291.41 4 582.5 286.49 14 593.37 290.23 5 582.86 282.25 15 594.13 287.67 6 584.08 287.28 16 594.78 289.58 7 583.63 285.95 17 598.63 288.51 8 585.56 290.21 18 600.98 288.38 9 585.94 291.92 19 603.22 291.76

[0101] Respectively determine whether the current moment data in the two groups of data is abnormal data. The average values and standard deviations of the two groups of historical data in Table 2 and Table 3 are calculated as follows:

[0102] The first group:

[0103]

[0104] The second group:

[0105]

[0106] For the first group, P0 = 330.61 and Q0 = 121.7; for the second group, P0 = 605.19 and Q0 = 296.06. Thus, the current moment data in these two groups of data both satisfy:

[0107]

[0108] Indicating that the current operating point is not abnormal data.

[0109] Then, continue to determine whether the operating point represented by the active power and reactive power of the generator at the current moment is outside the discrete boundary of the operating limit. If it is outside the discrete boundary of the operating limit, a power warning is issued. Figure 4 In this, p0 represents the current operating point, and the included angle formed by p0 and two adjacent boundary points p j and p j+1 is θ j . In this embodiment, it is stipulated that if the direction of θ j is counterclockwise, then θ j is positive; if the direction is clockwise, then θ j is negative. According to the boundary point coordinates in Table 1 and the current operating point coordinates in Table 2 and Table 3, it can be first judged that the current operating point is neither a boundary point nor on any side of the discretized operating limit boundary. Therefore, it is necessary to calculate the included angles between the current operating point in the two groups of data and all two adjacent boundary points respectively, as shown in Table 4.

[0110] Table 4 The included angles between the current operating point in the two groups of data and all two adjacent boundary points

[0111]

[0112]

[0113] The sum of the angles of the two sets of angles is calculated as follows:

[0114] The first set:

[0115] ∑θ j = 360.0°

[0116] The sum of all included angles in the first set satisfies ∑θ j = 360° ± ε (ε is taken as 1° in this embodiment), then the current point p0 in the first set of data belongs to S 极 :

[0117] The second set:

[0118] ∑θ j = 0.0°

[0119] The sum of all included angles in the second set satisfies ∑θ j = 0° ± ε (ε is taken as 1° in this embodiment), then the current point p0 in the second set of data is outside the running limit discrete boundary.

[0120] The above results show that: the current operating point in the first set of data is within the operating limit boundary and no warning signal needs to be issued; while the current operating point in the second set of data is outside the operating limit boundary, so a power warning signal is issued.

[0121] Figure 5 The device shown can execute the warning method for the generator power operating limit according to the embodiment of the present application.

[0122] As Figure 5 shown, the warning device 400 for the generator power operating limit includes: a discrete boundary calculation unit 401, a data acquisition unit 402, and a judgment unit 403.

[0123] The discrete boundary calculation unit 401 is used to discretize the line segments or curves constituting the generator power operating limit boundary into a series of boundary points respectively, and form a running limit discrete boundary with the polygon composed of each boundary point.

[0124] The data acquisition unit 402 is used to collect the active power and reactive power data of the generator at the current moment, denoted as P0 and Q0.

[0125] The judgment unit 403 is used to judge whether the operating point represented by the active power and reactive power of the generator at the current moment is outside the running limit discrete boundary. If it is outside the running limit discrete boundary, a power warning is issued.

[0126] In some embodiments, the data acquisition unit 402 further includes: saving the historical active power and reactive power data of the generator within a preset time length; using a data anomaly discrimination method to determine whether the active power and reactive power of the generator at the current moment are abnormal data. If they are abnormal data, the discrimination of power warning is ended; otherwise, it enters the judgment unit 403.

[0127] The device performs functions similar to the methods provided previously. For other functions, refer to the previous descriptions and will not be elaborated here.

[0128] Figure 6 The structure diagram of an electronic device provided by the present application is shown.

[0129] Refer to Figure 6 , Figure 6 An electronic device is provided, including a processor and a memory. The memory stores computer instructions. When the computer instructions are executed by the processor, the processor executes the computer instructions to implement the method and refinement scheme as Figure 1 shown.

[0130] It should be understood that the above device embodiments are illustrative only, and the devices disclosed by the present invention can also be implemented in other ways. For example, the division of the above-mentioned units / modules is only a logical function division, and there can be other division methods in actual implementation. For example, multiple units, modules or components can be combined, or can be integrated into another system, or some features can be ignored or not executed.

[0131] In addition, without special explanation, in each embodiment of the present invention, each functional unit / module can be integrated in one unit / module, or each unit / module can exist physically alone, or two or more units / modules can be integrated together. The above integrated unit / module can be implemented in the form of hardware or in the form of a software program module.

[0132] When the integrated unit / module is implemented in the form of hardware, the hardware can be a digital circuit, an analog circuit, etc. The physical implementation of the hardware structure includes, but is not limited to, transistors, memristors, etc. Unless otherwise specified, the processor or chip can be any suitable hardware processor, such as a CPU, GPU, FPGA, DSP, and ASIC, etc. Unless otherwise specified, the on-chip cache, off-chip memory, and memory can be any suitable magnetic storage medium or magneto-optical storage medium, such as resistive random access memory (RRAM), dynamic random access memory (DRAM), static random access memory (SRAM), enhanced dynamic random access memory (EDRAM), high-bandwidth memory (HBM), hybrid memory cube (HMC), etc.

[0133] When the integrated unit / module is implemented in the form of a software program module and sold or used as an independent product, it can be stored in a computer-readable memory. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a memory and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of this disclosure. The aforementioned memory includes: various media that can store program codes, such as USB flash drives, read-only memories (ROMs), random access memories (RAMs), external hard drives, magnetic disks, or optical discs.

[0134] The embodiments of this application also provide a non-transitory computer storage medium storing a computer program, which, when executed by multiple processors, causes the processors to execute the method and refinement scheme as Figure 1 shown.

[0135] It should be clearly understood that this application describes how to form and use specific examples, but this application is not limited to any details of these examples. On the contrary, based on the teachings of the content disclosed in this application, these principles can be applied to many other embodiments.

[0136] In addition, it should be noted that the above-mentioned drawings are only schematic illustrations of the processes included in the method according to the exemplary embodiments of the present application, rather than for restrictive purposes. It is easy to understand that the processes shown in the above-mentioned drawings do not indicate or limit the chronological order of these processes. Additionally, it is also easy to understand that these processes can be executed synchronously or asynchronously in, for example, multiple modules.

[0137] The exemplary embodiments of the present application have been specifically shown and described above. It should be understood that the present application is not limited to the detailed structures, settings, or implementation methods described herein; on the contrary, the present application is intended to cover various modifications and equivalent settings included within the spirit and scope of the appended claims.

Claims

1. A warning method for the power operation limit of a generator, characterized in that, It includes the following steps: Step (1), discretize the line segments or curves that constitute the power operation limit boundary of the generator into a series of boundary points respectively, and use the polygon formed by each boundary point to constitute the discrete operation limit boundary S 极 ; Step (2), real-time collect the active power and reactive power data of the generator at the current moment, denoted as P0 and Q0; Step (3), determine whether the operating point represented by the active power and reactive power of the generator at the current moment is outside the discrete boundary of the operating limit. If it is outside the discrete boundary of the operating limit, a power warning is issued; The method for determining whether the operating point represented by the active power and reactive power of the generator at the current moment is outside the discrete boundary of the operating limit is as follows: Denote the two-dimensional point (P0, Q0) represented by the active power and reactive power of the generator at the current moment as p0. First, determine whether the active power and reactive power point p0 of the generator at the current moment coincides with the boundary points forming S 极 or p0 is on one of the sides of the polygon forming S 极 . If so, it is considered that p0 is within the discrete boundary of the operating limit, denoted as p0 ∈ S 极 . Otherwise, sum the angles between p0 and all adjacent boundary points on S 极 . Determine whether p0 is outside the discrete boundary of the operating limit based on the sum of the angles. If so, issue a power warning.

2. The early warning method for the operating limit of the generator power according to claim 1, wherein The said step (2) also includes: saving the historical data of the active power and reactive power of the generator within a preset time length; using a data anomaly discrimination method to determine whether the active power and reactive power of the generator at the current moment are abnormal data. If they are abnormal data, end the discrimination of the power warning. Otherwise, enter step (3).

3. The early warning method for the operating limit of the generator power according to claim 1, characterized in that In the step (1), the power operation limit boundary of the generator is a closed figure S(L1, L2, …, L n ) composed of multiple line segments or curves, where L1, L2, …, L n respectively represent the line segments or curves that make up the operation limit boundary; Discretize each line segment or curve into multiple points to obtain boundary points p corresponding to each line segment or curve 1,1 , p 1,2 , …, p 1,k1 , p 2,1 , p 2,2 , …, p 2,k2 , …, p n,1 , p n,2 , …, p n,kn ; where: p 1,1 , p 1,2 , …, p 1,k1 represent the points corresponding to the curve L1, p 2,1 , p 2,2 , …, p 2,k2 represent the points corresponding to the curve L2, p n,1 , p n,2 , …, p n,kn represent the points corresponding to the curve L n Connect these discretized boundary points in sequence end to end to form a polygon S that represents the discrete boundary of the operating limit of the generator power 极 .

4. The early warning method for the operating limit of the generator power according to claim 1, characterized in that, The determination method of the operating limit boundary of the generator power in the said step (1) includes: Determine the actual operating curve according to the actual generator parameters; Multiply the actual operating curve by a proportionality coefficient as the warning boundary range, and the proportionality coefficient is taken as 80% - 95%.

5. The early warning method for the operating limit of the generator power according to claim 2, wherein, The preset time length of the historical data is 1 - 5 minutes, and the acquisition time interval is 3 - 5 seconds.

6. The early warning method for the operating limit of the generator power according to claim 2, wherein, The said step (2) specifically includes: Step (2.1), collect the active power and reactive power at the current moment in real time, denoted as P0 and Q0 respectively, and save the historical data of active power and reactive power, denoted as {P1, P2,..., P m} and {Q1, Q2,..., Q m}, Step (2.2), calculate the standard deviation σ of the historical active power data P and the standard deviation σ of the historical reactive power data Q : wherein, and are respectively the average value of the active power historical data and the average value of the reactive power historical data: Step (2.3), if the active power P0 or reactive power Q0 at the current moment does not meet the following conditions: Then it is considered that the sampling data at the current moment is abnormal data, end the discrimination of the power warning. Otherwise, enter step (3).

7. The warning method for the operating limit of generator power according to claim 1, characterized in that The summation of the included angles of all adjacent boundary points between p0 and S 极 is performed, and it is determined whether p0 is outside the discrete boundary of the operating limit based on the sum of the included angles. If so, a power warning is issued, specifically including: Number the boundary points sequentially, and denote the included angle ∠p j between p0 and two adjacent boundary points p j+1 and p j as θ j+1 ; if the included angle is counterclockwise, it is positive; if the included angle is clockwise, it is negative, or vice versa. j ​ When the included angle is counterclockwise, it is positive; when the included angle is clockwise, it is negative. If the sum of all included angles satisfies the following conditions, it indicates that p0 ∈ S 极 : ∑θ j = 360° ± ε Equation (4) When the included angle is negative for counterclockwise and positive for clockwise, if the sum of all included angles satisfies the following conditions, it indicates that p0 ∈ S 极 : ∑θ j = -360° ± ε Equation (5) If the sum of all included angles meets the following conditions, then p0 is outside the discrete boundary of the operating limit, and a power warning is issued: ∑θ j = 0° ± ε Equation (6) where ε represents the calculation error.

8. The warning method for the operating limit of generator power according to claim 1, characterized in that The summation of the included angles between all adjacent boundary points of p0 and S 极 is performed, and it is determined whether p0 is outside the discrete boundary of the operating limit based on the sum of the included angles. If so, a power warning is issued, specifically including: Number the boundary points sequentially, and denote the angle ∠p j between p0 and two adjacent boundary points p j+1 and p j as θ j+1 ; the angle is positive if it is counterclockwise and negative if it is clockwise, or the angle is negative if it is counterclockwise and positive if it is clockwise; j ​ If the sum of all included angles satisfies the following conditions, then p0 is outside the discrete boundary of the operating limit, and a power warning is issued; otherwise, it is considered that p0 ∈ S 极 : ∑θ j = 0° ± ε Equation (6) where ε represents the calculation error.

9. An early warning device for the power operation limit of a generator, characterized in that, It includes: A discrete boundary calculation unit, configured to discretize line segments or curves that constitute the power operation limit boundary of a generator into a series of boundary points respectively, and form a discrete operation limit boundary S with a polygon composed of the respective boundary points 极 ; A data acquisition unit, used to real-time collect the active power and reactive power data of the generator at the current moment, denoted as P0 and Q0; A judgment unit, used to determine whether the operating point represented by the active power and reactive power of the generator at the current moment is outside the discrete boundary of the operating limit. If it is outside the discrete boundary of the operating limit, a power warning is issued; The method for determining whether the operating point represented by the active power and reactive power of the generator at the current moment is outside the discrete boundary of the operating limit is as follows: Denote the two-dimensional point (P0, Q0) represented by the active power and reactive power of the generator at the current moment as p0. First, determine whether the active power and reactive power point p0 of the generator at the current moment coincides with the boundary points constituting S 极 or p0 lies on a certain side of the polygon constituting S 极 ; if so, it is considered that p0 is within the discrete boundary of the operating limit, denoted as p0 ∈ S 极 , otherwise, sum up the angles between p0 and all adjacent boundary points on S 极 , and judge whether p0 is outside the discrete boundary of the operating limit according to the sum of the angles. If so, issue a power warning.

10. The warning device for the operating limit of the generator power according to claim 9, characterized in that, The said data acquisition unit also includes: saving the historical data of the active power and reactive power of the generator within a preset time length; using a data anomaly discrimination method to determine whether the active power and reactive power of the generator at the current moment are abnormal data. If they are abnormal data, end the discrimination of the power warning. Otherwise, enter the judgment unit.

11. An electronic device, characterized in that, It includes: A processor; And A memory, storing computer instructions, when the computer instructions are executed by the processor, enabling the processor to execute the method described in any one of claims 1 - 8.

12. A non-transitory computer storage medium, storing a computer program, when the computer program is executed by multiple processors, enabling the processors to execute the method described in any one of claims 1 - 8.

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