Method for determining the inertia time constant of a generator set and device therefor

Abstract

The application provides a method and device for determining an inertia time constant of a generator set. The method comprises: performing step disturbance on a terminal voltage of a to-be-tested generator based on a first inertia time constant and a first preset threshold, amplifying a synthesized mechanical power integral of a power system stabilizer by a first preset coefficient, and recording a first waveform diagram to obtain a first target value based on a first pole value of the first waveform diagram; updating the first inertia time constant based on a preset adjustment step and the first target value to obtain a second inertia time constant, and then determining a second waveform diagram and a second target value; correcting the second inertia time constant based on a preset adjustment step, the first target value and the second target value to obtain a corrected inertia time constant, and then determining a third waveform diagram and a third target value; and obtaining a target inertia time constant when an absolute value of the third target value is less than or equal to a second preset threshold. The method solves the problem of a large error of a unit inertia time constant in the prior art.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power parameter setting, in particular to a method and device for determining the inertia time constant of a generator set, a computer readable storage medium and a generator set. BACKGROUND

[0002] The inertia time constant (T j ) of a generator set can accurately and effectively represent the rotational kinetic energy stored in the rotating part of the generator set, and is the main basis for determining the frequency dynamic characteristics of the generator set and the dynamic characteristics of the power grid (frequency stability and low-frequency oscillation, etc.). With the rapid increase of new energy in new power systems, new power systems are facing the risk of rapid decline in system rotational inertia.

[0003] In the prior art, there is a large difference between the maximum dynamic frequency fluctuation calculated by the dynamic model simulation of the power grid and the actual measured value (generally, the simulation value is larger), and the simulated frequency in low-frequency oscillation is also significantly higher than the actual measured frequency. A large amount of data shows that the rotational inertia (related to the inertia time constant) of the generator set in the simulation model is generally much lower than the actual value, resulting in lower effectiveness of the simulation calculation.

[0004] The inertia time constant of the common generator set is generally determined in two ways, one of which is to use the manufacturer's design value, and the other is to use the measured value for further calculation. The method of calculating the manufacturer's design value is based on the design value of the flywheel torque of the rotor-related rotating equipment of the power generation equipment. This method does not consider the disturbance caused by the change of water or gas in the actual operation process. The method of calculating the measured value is to calculate the acceleration at the moment when the generator set is tripped and the opening degree does not change. The acceleration in this method is difficult to accurately measure, and large errors are easily generated.

[0005] In summary, there is a lack of an accurate method for calculating the inertia time constant of a generator set in the prior art. SUMMARY

[0006] The main purpose of the present application is to provide a method and device for determining the inertia time constant of a generator set, a computer readable storage medium and a generator set, to at least solve the problem of large error in determining the inertia time constant based on simulation calculation in the prior art.

[0007] To achieve the above objectives, according to one aspect of this application, a method for determining the inertial time constant of a generator set is provided, comprising: acquiring a first inertial time constant; performing a step disturbance on the terminal voltage of the generator under test based on the first inertial time constant and a first preset threshold, amplifying the synthesized mechanical power integral of a power system stabilizer with a first preset coefficient and recording the waveform to obtain a first waveform diagram; determining a first swing pole value based on the second waveform diagram to obtain a first target value; updating the first inertial time constant according to a preset adjustment step size and the first target value to obtain a second inertial time constant; and performing a step disturbance on the terminal voltage of the generator under test based on the second inertial time constant and the first preset threshold, amplifying the synthesized mechanical power integral of the power system stabilizer with the first preset coefficient. The mechanical power integral is amplified and recorded to obtain a second waveform. Based on the third waveform, the first pendulum pole value is determined to obtain a second target value. The second inertial time constant is corrected based on the preset adjustment step size, the first target value, and the second target value to obtain a corrected inertial time constant. Based on the corrected inertial time constant and the first preset threshold, the terminal voltage of the generator under test is subjected to a step disturbance. The synthesized mechanical power integral of the power system stabilizer is amplified and recorded using the first preset coefficient to obtain a third waveform. Based on the fourth waveform, the first pendulum pole value is determined to obtain a third target value. If the absolute value of the third target value is less than or equal to the second preset threshold, the corrected inertial time constant is determined as the target inertial time constant.

[0008] Optionally, the first waveform diagram is obtained by performing a step disturbance on the terminal voltage of the generator under test based on the first inertial time constant and the first preset threshold, amplifying the integrated mechanical power of the power system stabilizer with a first preset coefficient, and recording the waveform. This includes: substituting the first inertial time constant into a first preset formula to calculate the power gain coefficient of the power system stabilizer, thereby obtaining a first gain coefficient; and performing a step disturbance on the terminal voltage of the generator under test based on the first gain coefficient with the first preset threshold, amplifying the integrated mechanical power of the power system stabilizer with the first preset coefficient, and recording the waveform.

[0009] Optionally, the first inertia time constant is updated according to a preset adjustment step and the first target value to obtain a second inertia time constant, and a terminal voltage of the to-be-tested generator is step disturbed based on the second inertia time constant and the first preset threshold to amplify the integrated synthetic mechanical power of the power system stabilizer by the first preset coefficient and record a waveform to obtain a second waveform, including: in a case where the first target value is less than 0, calculating a sum of the first inertia time constant and the preset adjustment step to obtain the second inertia time constant; in a case where the first target value is greater than 0, calculating a difference between the first inertia time constant and the preset adjustment step to obtain the second inertia time constant; calculating a power gain coefficient of the power system stabilizer by substituting the second inertia time constant into a first preset formula to obtain a second gain coefficient; step disturbing the terminal voltage of the to-be-tested generator by the first preset threshold based on the second gain coefficient to amplify the integrated synthetic mechanical power of the power system stabilizer by the first preset coefficient and record a waveform to obtain the second waveform.

[0010] Optionally, the second inertia time constant is corrected based on the preset adjustment step, the first target value and the second target value to obtain a corrected inertia time constant, including: in a case where the first target value is less than 0, determining the preset adjustment step as a target adjustment step, in a case where the first target value is greater than 0, taking an opposite number of the preset adjustment step to obtain the target adjustment step; substituting the second inertia time constant, the target adjustment step, the first target value and the second target value into a second preset formula to obtain the corrected inertia time constant.

[0011] Optionally, the second preset formula is wherein, T` j is the corrected inertia time constant, T j-2 is the second inertia time constant, a1 is the first target value, a2 is the second target value, and Δt` is the target adjustment step.

[0012] Optionally, a terminal voltage of the to-be-tested generator is step disturbed based on the corrected inertia time constant, the first waveform and the first preset threshold to amplify the integrated synthetic mechanical power of the power system stabilizer by the first preset coefficient and record a waveform to obtain a third waveform, including: calculating a power gain coefficient of the power system stabilizer by substituting the corrected inertia time constant into a first preset formula to obtain a third gain coefficient; step disturbing the terminal voltage of the to-be-tested generator by the first preset threshold based on the third gain coefficient and the first waveform to amplify the integrated synthetic mechanical power of the power system stabilizer by the first preset coefficient and record a waveform to obtain the third waveform.

[0013] Optionally, after determining the first pendulum pole value based on the third waveform chart to obtain the third target value, the method further includes: a first update step, where, if the absolute value of the third target value is greater than the second preset threshold, the first inertial time constant is updated based on the second inertial time constant, and the second inertial time constant is updated based on the corrected inertial time constant; a second update step, where the corresponding first target value is updated based on the updated first inertial time constant, and the corresponding second target value is updated based on the updated second inertial time constant; a third update step, where the corrected updated second inertial time constant is updated based on the preset adjustment step size, the updated first target value, and the updated second target value to obtain the updated corrected inertial time constant; a calculation step, where the third target value is updated based on the updated corrected inertial time constant; and the first update step, the second update step, the third update step, and the calculation step are repeated at least once in sequence until the absolute value of the updated third target value is less than or equal to the second preset threshold, and the latest corrected inertial time constant is determined as the target inertial time constant.

[0014] According to another aspect of this application, a device for measuring the inertial time constant of a generator set is provided. The device includes: a first acquisition unit, configured to monitor the synthetic mechanical power output by a power system stabilizer and amplify the synthetic mechanical power with a first preset coefficient to obtain a first waveform; a second acquisition unit, configured to acquire the first inertial time constant, and perform a step disturbance on the terminal voltage of the generator under test based on the first inertial time constant, the first waveform, and a first preset threshold to obtain a second waveform, and determine a first swing pole value based on the second waveform to obtain a first target value; and a first calculation unit, configured to update the first inertial time constant according to a preset adjustment step size and the first target value to obtain a second inertial time constant, and calculate the second inertial time constant based on the first waveform. The generator terminal voltage under test is subjected to a step perturbation using the first preset threshold to obtain a third waveform. Based on the third waveform, the first pendulum pole value is determined to obtain a second target value. A second calculation unit is used to correct the second inertial time constant based on the preset adjustment step size, the first target value, and the second target value to obtain a corrected inertial time constant. Based on the corrected inertial time constant, the first waveform, and the first preset threshold, the generator terminal voltage under test is subjected to a step perturbation to obtain a fourth waveform. Based on the fourth waveform, the first pendulum pole value is determined to obtain a third target value. A first determination unit is used to determine the corrected inertial time constant as the target inertial time constant if the absolute value of the third target value is less than or equal to the second preset threshold.

[0015] According to still another aspect of the present application, a computer readable storage medium is provided, the computer readable storage medium comprising a stored program, wherein the computer readable storage medium is caused to perform any of the methods described when the program is run.

[0016] According to still another aspect of the present application, a generator set is provided, comprising one or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs comprising any of the methods described.

[0017] In the determination method of the inertia time constant of the generator set, the first inertia time constant is obtained, and the terminal voltage of the to-be-tested generator is subjected to step disturbance based on the first inertia time constant and the first preset threshold, the integral of the synthesized mechanical power of the power system stabilizer is amplified by the first preset coefficient, and the waveforms are recorded to obtain a first waveform graph, the first target value is obtained based on the first waveform graph and the first pole value. Then, the first inertia time constant is updated according to the preset adjustment step and the first target value to obtain a second inertia time constant, and the terminal voltage of the to-be-tested generator is subjected to step disturbance based on the second inertia time constant and the first preset threshold, the integral of the synthesized mechanical power of the power system stabilizer is amplified by the first preset coefficient, and the waveforms are recorded to obtain a second waveform graph, the second target value is obtained based on the second waveform graph and the first pole value. Then, the second inertia time constant is corrected based on the preset adjustment step, the first target value and the second target value to obtain a corrected inertia time constant, the terminal voltage of the to-be-tested generator is subjected to step disturbance based on the corrected inertia time constant and the first preset threshold, the integral of the synthesized mechanical power of the power system stabilizer is amplified by the first preset coefficient, and the waveforms are recorded to obtain a third waveform graph, the third target value is obtained based on the third waveform graph and the first pole value. Finally, in the case that the absolute value of the third target value is less than or equal to a second preset threshold, the corrected inertia time constant is determined as the target inertia time constant. The present application determines based on the mechanical integrated power output curve of the power system stabilizer, and the inertia time constant of the generator set can be quickly calibrated through simple step disturbance operation, which solves the problem of large error of the inertia time constant of the generator set in the prior art. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 A hardware structure block diagram of a mobile terminal according to the determination method of the inertia time constant of the generator set provided in the embodiments of the present application is shown;

[0019] Figure 2A flow chart of a method for determining an inertia time constant of a generator set is shown according to an embodiment of the present application;

[0020] Figure 3 A main wiring diagram of a single machine infinite system is shown according to an embodiment of the present application;

[0021] Figure 4 An output curve of a synthesized mechanical power under different inertia time constants is shown according to an embodiment of the present application;

[0022] Figure 5 A structural block diagram of a device for determining an inertia time constant of a generator set is shown according to an embodiment of the present application.

[0023] Among the above drawings, the following reference signs are included:

[0024] 102, processor; 104, memory; 106, transmission device; 108, input and output device. DETAILED DESCRIPTION

[0025] It should be noted that the embodiments and features of the embodiments in the present application can be combined with each other without conflict. The technical solutions in the embodiments of the present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should be within the scope of protection of the present application.

[0026] In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should be within the scope of protection of the present application.

[0027] It should be noted that the terms "first", "second" and the like in the specification and claims of the present application and the above drawings are used to distinguish similar objects, and do not necessarily describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not necessarily limit to those clearly listed steps or units, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0028] As described in the background section, there is a lack of an accurate method for calculating the inertial time constant of a generator set in the prior art. In order to solve the problem that the inertial time constant determined by simulation calculation in the prior art has a large error, the embodiments of this application provide a method, device, computer-readable storage medium and generator set for measuring the inertial time constant of a generator set.

[0029] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0030] The methods and embodiments provided in this application can be executed on a mobile terminal, a computer terminal, or a similar computing device. Taking running on a mobile terminal as an example, Figure 1 This is a hardware structure block diagram of a mobile terminal for a method of determining the inertial time constant of a generator set according to an embodiment of the present invention. Figure 1 As shown, a mobile terminal may include one or more ( Figure 1 Only one is shown in the diagram. A processor 102 (which may include, but is not limited to, a microprocessor MCU or a programmable logic device FPGA, etc.) and a memory 104 for storing data are also shown. The mobile terminal may further include a transmission device 106 for communication functions and an input / output device 108. Those skilled in the art will understand that... Figure 1 The structure shown is for illustrative purposes only and does not limit the structure of the mobile terminal described above. For example, the mobile terminal may also include components that are more... Figure 1 The more or fewer components shown, or having the same Figure 1 The different configurations shown.

[0031] The memory 104 can be used to store computer programs, such as software programs of application software and modules, such as a computer program corresponding to the display method of device information in the embodiments of the present application. The processor 102 executes various functional applications and data processing, i.e., implements the above method, by running the computer programs stored in the memory 104. The memory 104 can include a high-speed random access memory, and can further include a non-volatile memory, such as one or more magnetic storage devices, flash memories, or other non-volatile solid-state memories. In some examples, the memory 104 can further include memories remotely arranged with respect to the processor 102, which can be connected to the mobile terminal through a network. Examples of the above network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and a combination thereof. The transmission device 106 is used to receive or send data via a network. The specific examples of the above network can include a wireless network provided by a communication provider of the mobile terminal. In one example, the transmission device 106 includes a network adapter (NIC), which can be connected to other network devices through a base station so as to communicate with the Internet. In one example, the transmission device 106 can be a radio frequency (RF) module, which is used to communicate with the Internet in a wireless manner.

[0032] In the present embodiment, a method for measuring an inertia time constant of a generator set is provided, which is run on a mobile terminal, a computer terminal or a similar computing device. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described herein can be executed in an order different from that shown herein.

[0033] Figure 2 is a flowchart of the method for measuring the inertia time constant of the generator set according to the embodiments of the present application. As shown in Figure 2 , the method comprises the following steps:

[0034] In step S201, a first inertia time constant is obtained, and a machine terminal voltage of a to-be-measured generator is subjected to a step disturbance based on the first inertia time constant and a first preset threshold value, and a synthesized mechanical power integral of a power system stabilizer is amplified by a first preset coefficient, and a wave is recorded to obtain a first waveform diagram, a first pole value is calibrated based on the first waveform diagram, and a first target value is obtained.

[0035] In one embodiment, a single-machine infinite system is taken as an example for illustration, and a wiring diagram of the single-machine infinite system is shown in Figure 3 .

[0036] Specifically, an inertia time constant initial value Tj=9.6, i.e. the first inertia time constant, is obtained, and a power gain coefficient of a power system stabilizer (PSS) is calculated based on the first inertia time constant, and the integrated mechanical power is amplified 1000 times in the power system stabilizer based on the parameter, so as to ensure that the oscillogram is easy to analyze and calculate, and the amplified mechanical integrated power is taken as an output point of the oscillogram, a step disturbance of -3% is performed on the terminal voltage of the generator to be tested, and the oscillogram is obtained, and the first waveform diagram is obtained as shown in FIG. 1. Figure 4 The first target value is obtained by analyzing the curve C1 and calibrating the first pole value a1 in the curve C1.

[0037] It can be understood that the inertia time constant initial value is determined based on a design parameter of a unit or a measured value or a conventional estimated value of load shedding. Figure 4 Tj=11.6 and a=0.0046 are used for comparison, and a reference waveform diagram obtained by oscillography based on an actual inertia time constant is shown in FIG. 2.

[0038] In step S202, the first inertia time constant is updated based on a preset adjustment step and the first target value to obtain a second inertia time constant, and a step disturbance is performed on the terminal voltage of the generator to be tested based on the second inertia time constant and the first preset threshold, and the integrated mechanical power of the power system stabilizer is amplified by the first preset coefficient, and the oscillogram is obtained, to obtain a second waveform diagram, and the first pole value is calibrated based on the second waveform diagram to obtain a second target value.

[0039] Specifically, an adjustment step Δt of the inertia time constant is obtained, the first inertia time constant is updated based on the preset adjustment step to obtain the second inertia time constant, and a power gain coefficient of a power system stabilizer (PSS) is calculated based on the second inertia time constant, and a step disturbance of -3% is performed on the terminal voltage of the generator to be tested based on the parameter, and the oscillogram is obtained, to obtain the second waveform diagram as shown in FIG. 3. Figure 4 The second target value is obtained by analyzing the curve C2 and calibrating the first pole value a2 in the curve C2.

[0040] In step S203, the second inertia time constant is corrected based on the preset adjustment step, the first target value and the second target value to obtain a corrected inertia time constant, a step disturbance is performed on the terminal voltage of the generator to be tested based on the corrected inertia time constant and the first preset threshold, and the integrated mechanical power of the power system stabilizer is amplified by the first preset coefficient, and the oscillogram is obtained, to obtain a third waveform diagram, and the first pole value is calibrated based on the third waveform diagram to obtain a third target value.

[0041] Specifically, the coefficient is determined based on the first target value and the second target value, and the preset adjustment step is corrected based on the coefficient, further, the second inertia time constant is updated based on the corrected preset adjustment step to obtain the corrected inertia time constant, and then the power gain coefficient of the power system stabilizer (PSS) is calculated based on the second inertia time constant, the terminal voltage of the to-be-tested generator is disturbed by-3% step based on the parameter, and the wave recording is performed to obtain the third waveform diagram, such as Figure 4 As shown in C` in the middle of FIG. 12, the curve C` is analyzed and the first swing pole value a` is calibrated to obtain the third target value.

[0042] In step S204, in a case where the absolute value of the third target value is less than or equal to a second preset threshold, the corrected inertia time constant is determined as a target inertia time constant.

[0043] Specifically, the deviation of the corrected inertia time constant is determined based on the third target value, and in a case where the absolute value of the third target value is less than or equal to a second preset threshold, it is determined that the error meets the requirement, and the corrected inertia time constant is determined as a target inertia time constant.

[0044] By the embodiment, first, a first inertia time constant is acquired, and a terminal voltage of a to-be-tested generator is subjected to a step disturbance based on the first inertia time constant and a first preset threshold, a synthesized mechanical power integral of a power system stabilizer is amplified by a first preset coefficient, and a first waveform graph is obtained based on the step disturbance and the amplification, a first target value is obtained based on a first swing pole value calibrated based on the first waveform graph; then, the first inertia time constant is updated according to a preset adjustment step and the first target value, a second inertia time constant is obtained, and the terminal voltage of the to-be-tested generator is subjected to a step disturbance based on the second inertia time constant and the first preset threshold, the synthesized mechanical power integral of the power system stabilizer is amplified by the first preset coefficient, and a second waveform graph is obtained based on the step disturbance and the amplification, a second target value is obtained based on a first swing pole value calibrated based on the second waveform graph; thereafter, the second inertia time constant is corrected based on the preset adjustment step, the first target value and the second target value, a corrected inertia time constant is obtained, the terminal voltage of the to-be-tested generator is subjected to a step disturbance based on the corrected inertia time constant and the first preset threshold, the synthesized mechanical power integral of the power system stabilizer is amplified by the first preset coefficient, and a third waveform graph is obtained based on the step disturbance and the amplification, a third target value is obtained based on a first swing pole value calibrated based on the third waveform graph; finally, in a case where an absolute value of the third target value is less than or equal to a second preset threshold, the corrected inertia time constant is determined as a target inertia time constant. The application is based on a mechanical synthesis power output curve of a power system stabilizer, and the inertia time constant of a generator set can be quickly calibrated through a simple step disturbance operation, which solves the problem of a large error of a unit inertia time constant in the prior art.

[0045] To obtain the first waveform graph, in an optional embodiment, the step S201 includes:

[0046] In the step S2011, the first inertia time constant is substituted into a first preset formula to calculate a power gain coefficient of the power system stabilizer, and a first gain coefficient is obtained.

[0047] Specifically, the first inertia time constant is substituted into the first preset formula to calculate the power gain coefficient (Ks2) of the power system stabilizer: Ks2=4 / 9.6=0.417, the parameter is adjusted and set, and the first gain coefficient is obtained.

[0048] In the step S2012, the terminal voltage of the to-be-tested generator is subjected to a step disturbance based on the first gain coefficient and the first preset threshold, the synthesized mechanical power integral of the power system stabilizer is amplified by the first preset coefficient, and a first waveform graph is obtained based on the step disturbance and the amplification.

[0049] Specifically, based on the aforementioned first gain coefficient, the terminal voltage of the generator under test is subjected to a step disturbance with the aforementioned first preset threshold, and the waveform is recorded to obtain the aforementioned first waveform diagram, as shown below. Figure 4 As shown in curve C1.

[0050] It is understandable that the extreme point of the first pendulum is a1 = -0.1053.

[0051] To obtain the second waveform described above, in one optional implementation, step S202 includes:

[0052] Step S2021: When the first target value is less than 0, calculate the sum of the first inertial time constant and the preset adjustment step size to obtain the second inertial time constant.

[0053] Specifically, if a1 < 0, then according to T j-2 =T j-1 +Δt calculates the second inertial time constant mentioned above.

[0054] Step S2022: When the first target value is greater than 0, calculate the difference between the first inertial time constant and the preset adjustment step size to obtain the second inertial time constant.

[0055] Specifically, if a1 > 0, then according to T j-2 =T j-1 -Δt is used to calculate the second inertial time constant mentioned above.

[0056] Step S2023: Substitute the above-mentioned second inertial time constant into the first preset formula to calculate the power gain coefficient of the above-mentioned power system stabilizer, and obtain the second gain coefficient;

[0057] Specifically, the power gain coefficient of the power system stabilizer is calculated by substituting the second inertial time constant into the first preset formula: T j-2 =T j-1 ±1, adjust and set this parameter to obtain the second gain coefficient mentioned above.

[0058] In one embodiment, such as Figure 4 As shown by curve C1, since a1 = -0.1053 < 0, then T j-2 =9.6 + 1 = 10.6 s.

[0059] Step S2024: Based on the second gain coefficient, the terminal voltage of the generator under test is subjected to a step disturbance with the first preset threshold. The integrated mechanical power of the power system stabilizer is amplified and recorded with the first preset coefficient to obtain the second waveform diagram.

[0060] Specifically, the machine terminal voltage of the to-be-tested generator is stepped disturbed above the first preset threshold based on the second gain coefficient, and a recording wave is performed to obtain the second waveform diagram. Figure 4 The curve C2 is shown in the middle.

[0061] It can be understood that the first swing pole point value a2 of the curve C2 is -0.05.

[0062] In order to obtain the corrected inertia time constant, in an optional embodiment, the step S203 comprises:

[0063] In the case that the first target value is less than 0, the preset adjustment step is determined as the target adjustment step, and in the case that the first target value is greater than 0, the preset adjustment step is taken as the opposite number to obtain the target adjustment step.

[0064] Specifically, if a1<0, let Δt'=Δt; if a1>0, then Δt'=Δt, to obtain the target adjustment step.

[0065] In the step S2032, the second inertia time constant, the target adjustment step, the first target value and the second target value are substituted into the second preset formula to obtain the corrected inertia time constant.

[0066] Specifically, the target adjustment step is corrected based on the first target value and the second target value, and the second inertia time coefficient is corrected based on the corrected target adjustment step to obtain the corrected inertia time constant.

[0067] In order to calculate the corrected inertia time constant, the second preset formula is Wherein, T` j is the corrected inertia time constant, T j-2 is the second inertia time constant, a1 is the first target value, a2 is the second target value, and Δt` is the target adjustment step.

[0068] In order to obtain the third waveform diagram, in an optional embodiment, the step S203 further comprises:

[0069] In the step S2033, the corrected inertia time constant is substituted into the first preset formula to calculate the power gain coefficient of the power system stabilizer to obtain the third gain coefficient.

[0070] Specifically, the corrected inertia time constant is substituted into the first preset formula to calculate the power gain coefficient of the power system stabilizer: The parameter is set and arranged to obtain the third gain coefficient.

[0071] In an embodiment, ifFigure 4 The middle curve C1 and C2 are shown as

[0072] Step S2034, based on the third gain coefficient and the first waveform diagram above the first preset threshold of the terminal voltage of the generator above the first preset threshold to the first preset coefficient of the power system stabilizer to amplify the integral of the synthetic mechanical power and record the wave and record the wave, get the third waveform diagram.

[0073] Specifically, based on the third gain coefficient, the terminal voltage of the generator above the first preset threshold is stepped disturbed and recorded, and the third waveform diagram is obtained, as Figure 4 The middle curve C` is shown.

[0074] It can be understood that the first pole point value a′ of the measured curve C` is 0.0003.

[0075] In order to further correct the large deviation of the corrected inertia time coefficient, in an optional embodiment, after calibrating the first pole point value based on the third waveform diagram to obtain the third target value, the method further comprises:

[0076] Step S301, first updating step, in the case that the absolute value of the third target value is greater than the second preset threshold, updating the first inertia time constant based on the second inertia time constant, updating the second inertia time constant based on the corrected inertia time constant;

[0077] Specifically, in the embodiment, in the case that the absolute value of the third target value is greater than the second preset threshold, that is, |a′|>ε, it is determined that the corrected inertia time coefficient deviation is large, and T j-2 is set as the first point, and the check value T′ j is set as the second point.

[0078] Step S302, second updating step, updating the corresponding first target value based on the updated first inertia time constant, and updating the corresponding second target value according to the updated second inertia time constant;

[0079] Specifically, the corresponding first target value is updated based on the updated first inertia time constant, and the corresponding second target value is updated according to the updated second inertia time constant.

[0080] Step S303, third updating step, updating the corrected second inertia time constant based on the preset adjustment step, the updated first target value, and the updated second target value, to obtain the updated corrected inertia time constant.

[0081] Specifically, the second inertia time constant is updated based on the preset adjustment step, the updated first target value, and the updated second target value.

[0082] In the calculating step, the third target value is updated based on the updated modified inertia time constant.

[0083] Specifically, in the calculating step, the third target value is updated based on the updated modified inertia time constant.

[0084] The first updating step, the second updating step, the third updating step, and the calculating step are repeated at least once in sequence until the absolute value of the updated third target value is less than or equal to the second preset threshold, and the latest modified inertia time constant is determined as the target inertia time constant.

[0085] Specifically, the first updating step, the second updating step, the third updating step, and the calculating step are repeated at least once in sequence until the absolute value of the third target value is less than or equal to the second preset threshold, and the modified inertia time constant is determined as the target inertia time constant.

[0086] It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described herein can be executed in an order different from that shown.

[0087] The embodiment of the present application also provides a device for measuring the inertia time constant of a generator set. It should be noted that the device for measuring the inertia time constant of a generator set according to the embodiment of the present application can be used to execute the method for measuring the inertia time constant of a generator set provided by the embodiment of the present application. The device is used to implement the above-mentioned embodiments and preferred embodiments, and will not be described again. As used below, the term "module" can be a combination of software and / or hardware that implements a predetermined function. Although the device described in the following embodiments is preferably implemented in software, hardware, or a combination of software and hardware can also be implemented and conceived.

[0088] The device for measuring the inertia time constant of a generator set provided by the embodiment of the present application is described below.

[0089] Figure 5 is a structural block diagram of the device for measuring the inertia time constant of a generator set according to the embodiment of the present application. As Figure 5 shown, the device includes:

[0090] The first obtaining unit 10 is configured to obtain a first inertia time constant, and perform step disturbance on a terminal voltage of a to-be-tested generator based on the first inertia time constant and a first preset threshold, amplify a synthesized mechanical power integral of a power system stabilizer by a first preset coefficient, and record a waveform to obtain a first waveform graph, calibrate a first pole value based on the first waveform graph to obtain a first target value;

[0091] In an embodiment, a single-machine infinite system is taken as an example for illustration. The wiring diagram of the single-machine infinite system is shown in FIG. 1. Figure 3

[0092] Specifically, an inertia time constant initial value Tj=9.6 is obtained, that is, the first inertia time constant, and then a power gain coefficient of a power system stabilizer (PSS) is calculated based on the first inertia time constant. The synthesized mechanical power integral in the power system stabilizer is amplified by 1000 times based on the parameter, so as to ensure that the recorded waveform image is easy to analyze and calculate. The amplified mechanical synthesized power is taken as an output point of recording, a step disturbance of-3% is performed on the terminal voltage of the to-be-tested generator, and recording is performed to obtain the first waveform graph, as shown in FIG. 2C1. Figure 4 The first pole value a1 in the curve C1 is calibrated to obtain the first target value.

[0093] It can be understood that the inertia time constant initial value is determined based on a design parameter of a unit or a measured value or a conventional estimated value of load shedding. It can be understood that Figure 4 Tj=11.6 and a=0.0046 in FIG. 2 are used as a reference waveform graph recorded based on an actual inertia time constant for comparison.

[0094] The first calculating unit 30 is configured to update the first inertia time constant according to a preset adjustment step and the first target value to obtain a second inertia time constant, perform step disturbance on the terminal voltage of the to-be-tested generator based on the second inertia time constant and the first preset threshold, amplify the synthesized mechanical power integral of the power system stabilizer by the first preset coefficient, and record a waveform to obtain a second waveform graph, calibrate the first pole value based on the second waveform graph to obtain a second target value.

[0095] Specifically, an adjustment step Δt of the inertia time constant is obtained, the first inertia time constant is updated by the preset adjustment step to obtain the second inertia time constant, and then a power gain coefficient of a power system stabilizer (PSS) is calculated based on the second inertia time constant. The terminal voltage of the to-be-tested generator is subjected to step disturbance of-3% based on the parameter, and recording is performed to obtain the second waveform graph, as shown in FIG. 3C2. Figure 4 The first pole value a2 in the curve C2 is calibrated to obtain the second target value.​

[0096] The second computing unit 40 is configured to correct the second inertia time constant based on the preset adjustment step, the first target value and the second target value, to obtain a corrected inertia time constant, to perform step disturbance on the terminal voltage of the to-be-tested generator based on the corrected inertia time constant and the first preset threshold, to amplify the integral of the synthesized mechanical power of the power system stabilizer by the first preset coefficient and to record the waveforms to obtain a third waveform diagram, to calibrate a first swing pole value based on the third waveform diagram, and to obtain a third target value.

[0097] Specifically, the coefficient is determined based on the first target value and the second target value, and the preset adjustment step is corrected based on the coefficient. Further, the second inertia time constant is updated based on the corrected preset adjustment step to obtain the corrected inertia time constant. Then, the power gain coefficient of the power system stabilizer (PSS) is calculated based on the second inertia time constant. The terminal voltage of the to-be-tested generator is disturbed by -3% step, and the waveforms are recorded to obtain the third waveform diagram. As shown in FIG. 6, the third waveform diagram C' is analyzed, and the first swing pole value a' is calibrated to obtain the third target value. Figure 4

[0098] The first determining unit 50 is configured to determine the corrected inertia time constant as a target inertia time constant when the absolute value of the third target value is less than or equal to the second preset threshold.

[0099] Specifically, the deviation of the corrected inertia time constant is determined based on the third target value. When the absolute value of the third target value is less than or equal to the second preset threshold, it is determined that the error meets the requirement, and the corrected inertia time constant is determined as the target inertia time constant.

[0100] ​By the embodiment, the first acquisition unit acquires the first inertia time constant, and performs step disturbance on the terminal voltage of the to-be-tested generator based on the first inertia time constant and the first preset threshold value, amplifies the integrated synthetic mechanical power of the power system stabilizer by the first preset coefficient, and records the waveforms to obtain a first waveform graph. The first inertia time constant is updated according to the preset adjustment step and the first target value to obtain a second inertia time constant. The terminal voltage of the to-be-tested generator is disturbed based on the second inertia time constant and the first preset threshold value, the integrated synthetic mechanical power of the power system stabilizer is amplified by the first preset coefficient, and the waveforms are recorded to obtain a second waveform graph. The first inertia time constant is corrected based on the preset adjustment step, the first target value and the second target value to obtain a corrected inertia time constant. The terminal voltage of the to-be-tested generator is disturbed based on the corrected inertia time constant and the first preset threshold value, the integrated synthetic mechanical power of the power system stabilizer is amplified by the first preset coefficient, and the waveforms are recorded to obtain a third waveform graph. The first inertia time constant is determined as the target inertia time constant when the absolute value of the third target value is less than or equal to a second preset threshold value. The application can quickly calibrate the inertia time constant of the generator set through simple step disturbance operation based on the mechanical integrated power output curve of the power system stabilizer, and solves the problem of large error of the inertia time constant of the unit in the prior art.

[0101] To obtain the second waveform graph, in an optional embodiment, the first acquisition unit comprises:

[0102] The first calculation module is configured to calculate the power gain coefficient of the power system stabilizer by substituting the first inertia time constant into a first preset formula to obtain a first gain coefficient.

[0103] Specifically, the power gain coefficient (Ks2) of the power system stabilizer is calculated by substituting the first inertia time constant into a first preset formula: Ks2 = 4 / 9.6 = 0.417. The parameter is adjusted and set to obtain the first gain coefficient.

[0104] The first processing module is configured to perform step disturbance on the terminal voltage of the to-be-tested generator by the first preset threshold value based on the first gain coefficient, amplify the integrated synthetic mechanical power of the power system stabilizer by the first preset coefficient, and record the waveforms to obtain the first waveform graph.

[0105] Specifically, based on the aforementioned first gain coefficient, the terminal voltage of the generator under test is subjected to a step disturbance with the aforementioned first preset threshold, and the waveform is recorded to obtain the aforementioned first waveform diagram, as shown below. Figure 4 As shown in curve C1.

[0106] It is understandable that the extreme point of the first pendulum is a1 = -0.1053.

[0107] To obtain the second waveform described above, in one optional implementation, the first calculation unit includes:

[0108] The second calculation module is used to calculate the sum of the first inertial time constant and the preset adjustment step size when the first target value is less than 0, so as to obtain the second inertial time constant.

[0109] Specifically, if a1 < 0, then according to T j-2 =T j-1 +Δt calculates the second inertial time constant mentioned above.

[0110] The third calculation module is used to calculate the difference between the first inertial time constant and the preset adjustment step size when the first target value is greater than 0, so as to obtain the second inertial time constant.

[0111] Specifically, if a1 > 0, then according to T j-2 =T j-1 -Δt is used to calculate the second inertial time constant mentioned above.

[0112] The fourth calculation module has the ability to substitute the aforementioned second inertial time constant into the first preset formula to calculate the power gain coefficient of the aforementioned power system stabilizer, thereby obtaining the second gain coefficient;

[0113] Specifically, the power gain coefficient of the power system stabilizer is calculated by substituting the second inertial time constant into the first preset formula: T j-2 =T j-1 ±1, adjust and set this parameter to obtain the second gain coefficient mentioned above.

[0114] In one embodiment, such as Figure 4 As shown by curve C1, since a1 = -0.1053 < 0, then T j-2 =9.6 + 1 = 10.6 s.

[0115] The second processing module is used to perform a step disturbance on the terminal voltage of the generator under test based on the second gain coefficient and the first preset threshold, and to amplify and record the integrated mechanical power of the power system stabilizer using the first preset coefficient to obtain the second waveform diagram.

[0116] Specifically, the machine terminal voltage of the to-be-tested generator is stepped disturbed above the first preset threshold based on the second gain coefficient, and a recording wave is performed to obtain the second waveform diagram. Figure 4 The curve C2 is shown in the middle.

[0117] It can be understood that the first swing pole point value a2 of the measured curve C2 is -0.05.

[0118] In order to obtain the corrected inertia time constant, in an optional embodiment, the second calculation unit comprises:

[0119] The determination module is configured to, in a case where the first target value is less than 0, determine the preset adjustment step as a target adjustment step, and in a case where the first target value is greater than 0, take the opposite of the preset adjustment step to obtain the target adjustment step.

[0120] Specifically, if a1<0, let Δt'=Δt; if a1>0, then Δt'=Δt, to obtain the target adjustment step.

[0121] The fifth calculation module is configured to substitute the second inertia time constant, the target adjustment step, the first target value and the second target value into a second preset formula to obtain the corrected inertia time constant.

[0122] Specifically, the target adjustment step is corrected based on the first target value and the second target value, and the second inertia time coefficient is corrected based on the corrected target adjustment step to obtain the corrected inertia time constant.

[0123] In order to calculate the corrected inertia time constant, in an optional embodiment, the second preset formula is wherein, T` j is the corrected inertia time constant, T j-2 is the second inertia time constant, a1 is the first target value, a2 is the second target value, and Δt' is the target adjustment step.

[0124] Specifically, the corrected inertia time constant is calculated based on the second inertia time constant, the target adjustment step, the first target value and the second target value by the above formula.

[0125] In order to obtain the third waveform diagram, in an optional embodiment, the second calculation unit further comprises:

[0126] The sixth calculation module is configured to substitute the corrected inertia time constant into a first preset formula to calculate the power gain coefficient of the power system stabilizer to obtain a third gain coefficient.

[0127] Specifically, the modified inertia time constant is substituted into the first preset formula to calculate the power gain coefficient of the power system stabilizer: The parameter is set and arranged to obtain the third gain coefficient.

[0128] In an embodiment, as Figure 4 shown in curves C1 and C2,

[0129] The third processing module is configured to perform step disturbance on the terminal voltage of the to-be-tested generator above the first preset threshold based on the third gain coefficient and the first waveform diagram, amplify the integral of the synthesized mechanical power of the power system stabilizer by the first preset coefficient, record the waveform, and obtain the third waveform diagram.

[0130] Specifically, the terminal voltage of the to-be-tested generator is disturbed above the first preset threshold based on the third gain coefficient, and the waveform is recorded to obtain the third waveform diagram, as shown in curve C`. Figure 4

[0131] It can be understood that the first pole value a′ of the measured curve C` is 0.0003.

[0132] To further correct the large deviation of the modified inertia time coefficient, in an optional embodiment, the device further comprises:

[0133] The first updating unit is configured to, after the first pole value is set based on the fourth waveform diagram to obtain a third target value, perform a first updating step, and in a case where the absolute value of the third target value is greater than the second preset threshold, update the first inertia time constant based on the second inertia time constant and update the second inertia time constant based on the modified inertia time constant.

[0134] Specifically, in the above embodiment, in a case where the absolute value of the third target value is greater than the second preset threshold, i.e., |a′|>ε, it is determined that the modified inertia time coefficient has a large deviation, and T j-2 is set as the first point, and T j ′ is set as the second point.

[0135] The second updating unit is configured to perform a second updating step, update the corresponding first target value based on the updated first inertia time constant, and update the corresponding second target value based on the updated second inertia time constant.

[0136] ​Specifically, the corresponding first target value is updated based on the updated first inertia time constant, and the corresponding second target value is updated according to the updated second inertia time constant.

[0137] The third updating unit is configured to perform a third updating step, and update the modified second inertia time constant based on the preset adjustment step, the updated first target value, and the updated second target value, to obtain an updated modified inertia time constant.

[0138] Specifically, the modified second inertia time constant is updated based on the preset adjustment step, the updated first target value, and the updated second target value, to obtain the updated modified inertia time constant.

[0139] The third calculating unit is configured to perform a calculating step, and update the third target value based on the updated modified inertia time constant.

[0140] Specifically, the calculating step updates the third target value based on the updated modified inertia time constant.

[0141] The repeating unit is configured to repeat the first updating step, the second updating step, the third updating step, and the calculating step at least once in sequence until the absolute value of the updated third target value is less than or equal to the second preset threshold, and determine the latest modified inertia time constant as the target inertia time constant.

[0142] Specifically, the first updating step, the second updating step, the third updating step, and the calculating step are repeated at least once in sequence until the absolute value of the third target value is less than or equal to the second preset threshold, and the modified inertia time constant is determined as the target inertia time constant.

[0143] The generator set inertia time constant determination device includes a processor and a memory, and the first obtaining unit, the first calculating unit, the second calculating unit, and the first determining unit are stored in the memory as program units, and the corresponding functions are realized by the processor executing the program units stored in the memory. The modules are located in the same processor; or, the modules are located in different processors in any combination.

[0144] The processor includes a core, and the core retrieves the corresponding program unit from the memory. The core can be one or more, and the accuracy of the inertia time constant calculation can be improved by adjusting the core parameters.

[0145] The memory can include non-persistent memory in a computer readable medium, random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash memory, including at least one memory chip.

[0146] The embodiment of the present application provides a computer readable storage medium, the computer readable storage medium comprises a stored program, wherein the program controls a device where the computer readable storage medium is located to execute the generator set inertia time constant measurement method when the program runs.

[0147] Specifically, the generator set inertia time constant measurement method comprises:

[0148] In step S201, a first inertia time constant is acquired, a terminal voltage of a to-be-tested generator is subjected to step disturbance based on the first inertia time constant and a first preset threshold, a synthesized mechanical power integral of a power system stabilizer is amplified by a first preset coefficient, and a first waveform diagram is obtained by recording the wave, a first swing pole point value is calibrated based on the first waveform diagram, and a first target value is obtained.

[0149] In step S202, the first inertia time constant is updated according to a preset adjustment step and the first target value, a second inertia time constant is obtained, the terminal voltage of the to-be-tested generator is subjected to step disturbance based on the second inertia time constant and the first preset threshold, the synthesized mechanical power integral of the power system stabilizer is amplified by the first preset coefficient, and a second waveform diagram is obtained by recording the wave, a first swing pole point value is calibrated based on the second waveform diagram, and a second target value is obtained.

[0150] In step S203, the second inertia time constant is corrected based on the preset adjustment step, the first target value and the second target value, a corrected inertia time constant is obtained, the terminal voltage of the to-be-tested generator is subjected to step disturbance based on the corrected inertia time constant and the first preset threshold, the synthesized mechanical power integral of the power system stabilizer is amplified by the first preset coefficient, and a third waveform diagram is obtained by recording the wave, a first swing pole point value is calibrated based on the third waveform diagram, and a third target value is obtained.

[0151] In step S204, in a case where an absolute value of the third target value is less than or equal to a second preset threshold, the corrected inertia time constant is determined as a target inertia time constant.

[0152] The embodiment of the present application provides a processor, the processor is used for running a program, wherein the program executes the generator set inertia time constant measurement method when the program runs.

[0153] Specifically, the generator set inertia time constant measurement method comprises:

[0154] Step S201, obtain a first inertia time constant, and based on the first inertia time constant and a first preset threshold, perform step disturbance on a terminal voltage of a to-be-tested generator, amplify a synthesized mechanical power integral of a power system stabilizer by a first preset coefficient, and record a waveform to obtain a first waveform graph, calibrate a first swing pole value based on the first waveform graph, and obtain a first target value;

[0155] Step S202, update the first inertia time constant according to a preset adjustment step and the first target value to obtain a second inertia time constant, perform step disturbance on the terminal voltage of the to-be-tested generator based on the second inertia time constant and the first preset threshold, amplify the synthesized mechanical power integral of the power system stabilizer by the first preset coefficient, and record a waveform to obtain a second waveform graph, calibrate the first swing pole value based on the second waveform graph, and obtain a second target value;

[0156] Step S203, correct the second inertia time constant based on the preset adjustment step, the first target value, and the second target value to obtain a corrected inertia time constant, perform step disturbance on the terminal voltage of the to-be-tested generator based on the corrected inertia time constant and the first preset threshold, amplify the synthesized mechanical power integral of the power system stabilizer by the first preset coefficient, and record a waveform to obtain a third waveform graph, calibrate the first swing pole value based on the third waveform graph, and obtain a third target value;

[0157] Step S204, in a case where an absolute value of the third target value is less than or equal to a second preset threshold, determine the corrected inertia time constant as a target inertia time constant.

[0158] The embodiment of the present application provides a generator set, which comprises a processor, a memory, and a program stored in the memory and capable of running on the processor, and at least the following steps are realized when the processor executes the program:

[0159] Step S201, obtain a first inertia time constant, and based on the first inertia time constant and a first preset threshold, perform step disturbance on a terminal voltage of a to-be-tested generator, amplify a synthesized mechanical power integral of a power system stabilizer by a first preset coefficient, and record a waveform to obtain a first waveform graph, calibrate a first swing pole value based on the first waveform graph, and obtain a first target value;

[0160] Step S202, updating the first inertia time constant according to a preset adjustment step and the first target value to obtain a second inertia time constant, and performing step disturbance on the terminal voltage of the to-be-tested generator based on the second inertia time constant and the first preset threshold, amplifying the integrated synthetic mechanical power of the power system stabilizer by the first preset coefficient, and recording the waveforms to obtain a second waveform graph, calibrating the first swing pole value based on the second waveform graph to obtain a second target value;

[0161] Step S203, correcting the second inertia time constant based on the preset adjustment step, the first target value, and the second target value to obtain a corrected inertia time constant, performing step disturbance on the terminal voltage of the to-be-tested generator based on the corrected inertia time constant and the first preset threshold, amplifying the integrated synthetic mechanical power of the power system stabilizer by the first preset coefficient, and recording the waveforms to obtain a third waveform graph, calibrating the first swing pole value based on the third waveform graph to obtain a third target value;

[0162] Step S204, in a case where the absolute value of the third target value is less than or equal to a second preset threshold, determining the corrected inertia time constant as a target inertia time constant.

[0163] The application also provides a computer program product adapted to execute a program that initializes at least the following method steps when executed on a data processing device:

[0164] Step S201, obtaining a first inertia time constant, and performing step disturbance on the terminal voltage of the to-be-tested generator based on the first inertia time constant and a first preset threshold to amplify the integrated synthetic mechanical power of the power system stabilizer by a first preset coefficient, and recording the waveforms to obtain a first waveform graph, calibrating the first swing pole value based on the first waveform graph to obtain a first target value;

[0165] Step S202, updating the first inertia time constant according to a preset adjustment step and the first target value to obtain a second inertia time constant, and performing step disturbance on the terminal voltage of the to-be-tested generator based on the second inertia time constant and the first preset threshold, amplifying the integrated synthetic mechanical power of the power system stabilizer by the first preset coefficient, and recording the waveforms to obtain a second waveform graph, calibrating the first swing pole value based on the second waveform graph to obtain a second target value;

[0166] Step S203, based on the above-mentioned preset adjustment step, the above-mentioned first target value and the above-mentioned second target value, the above-mentioned second inertia time constant is corrected to obtain a corrected inertia time constant, based on the above-mentioned corrected inertia time constant and the above-mentioned first preset threshold, the terminal voltage of the generator to be tested is subjected to step disturbance, the integrated mechanical power of the power system stabilizer is amplified by the above-mentioned first preset coefficient, and a wave form diagram is recorded to obtain a third target value, based on the above-mentioned third wave form diagram, a first pole value is calibrated to obtain a third target value;

[0167] Step S204, in the case that the absolute value of the above-mentioned third target value is less than or equal to the second preset threshold, the above-mentioned corrected inertia time constant is determined as the target inertia time constant.

[0168] Obviously, those skilled in the art should understand that the modules or steps of the present application described above can be realized by general computing devices, which can be concentrated on a single computing device or distributed on a network composed of multiple computing devices, which can be realized by program codes executable by computing devices, so that they can be stored in storage devices and executed by computing devices, and in some cases, the steps shown or described can be executed in different order, or they can be manufactured into individual integrated circuit modules, or multiple modules or steps can be manufactured into a single integrated circuit module. Thus, the present application is not limited to any specific combination of hardware and software.

[0169] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can adopt a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer usable storage media containing computer usable program codes (including but not limited to disk storage, CD-ROM, optical storage, etc.).

[0170] The present application is described with reference to flowcharts and / or block diagrams according to the methods, devices (systems), and computer program products of the embodiments of the present application. 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 processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing devices produce a device that implements the functions specified in the flowcharts and / or block diagrams. Figure 1 The functions specified in one flow or multiple flows and / or blocks Figure 1 The device that implements the functions specified in one flow or multiple flows and / or blocks.

[0171] These computer program instructions can also be stored in a computer- readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instructions which implement the Figure 1 function specified in the flow or flows and / or blocks Figure 1 of the block or blocks.

[0172] These computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the Figure 1 function specified in the flow or flows and / or blocks Figure 1 of the block or blocks.

[0173] In a typical configuration, a computing device includes one or more processors (CPUs), input / output interfaces, network interfaces, and memory.

[0174] The memory can include non-persistent memory and / or volatile memory, such as a random access memory (RAM) including a cache area for the temporary storage of data. The memory can also include non-volatile memory, such as read only memory (ROM), electrically programmable read only memory (EPROM), electrically erasable programmable read only memory (EEPROM), flash memory, or a combination of non-volatile memories in different forms. The memory is an example of computer readable storage media.

[0175] Computer readable media includes permanent and non-permanent, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read only memory (ROM), electrically programmable read only memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital versatile disc (DVD), or other optical storage, magnetic cassettes, magnetic disks storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information accessible to a computing device. According to the definition herein, computer readable media does not include transitory media, such as modulated data signals and carrier waves.

[0176] It should also be noted that the terms "comprising", "containing", or any other similar term are intended to encompass the inclusion of one or more elements, steps, or components, but not exclusion of other elements, steps, or components. In other words, the term "comprising" is used in the sense of "including" rather than in the sense of "consisting only of".

[0177] From the above description, it can be seen that the above-mentioned embodiments of the present application achieve the following technical effects:

[0178] 1) The generator set inertia time constant determination method of the present application first obtains a first inertia time constant, and based on the first inertia time constant and a first preset threshold, performs step disturbance on the terminal voltage of the to-be-tested generator, amplifies the integrated mechanical power of the power system stabilizer by a first preset coefficient, and records the waveforms to obtain a first waveform graph. Based on the first waveform graph, the first target value is determined, and the first target value is obtained. Then, the first inertia time constant is updated according to a preset adjustment step and the first target value, and a second inertia time constant is obtained. Based on the second inertia time constant and the first preset threshold, step disturbance is performed on the terminal voltage of the to-be-tested generator, and the integrated mechanical power of the power system stabilizer is amplified by the first preset coefficient, and the waveforms are recorded to obtain a second waveform graph. Based on the second waveform graph, the first target value is determined, and the second target value is obtained. Then, based on the preset adjustment step, the first target value and the second target value, the second inertia time constant is corrected to obtain a corrected inertia time constant. Based on the corrected inertia time constant and the first preset threshold, step disturbance is performed on the terminal voltage of the to-be-tested generator, and the integrated mechanical power of the power system stabilizer is amplified by the first preset coefficient, and the waveforms are recorded to obtain a third waveform graph. Based on the third waveform graph, the first target value is determined, and the third target value is obtained. Finally, in the case that the absolute value of the third target value is less than or equal to a second preset threshold, the corrected inertia time constant is determined as the target inertia time constant. The present application determines based on the mechanical integrated power output curve of the power system stabilizer, and through simple step disturbance operation, the inertia time constant of the generator set can be quickly calibrated. This method solves the problem of large error of unit inertia time constant in the prior art.

[0179] 2) The generator set inertia time constant measuring device of the application, the first acquisition unit acquires the first inertia time constant, and based on the first inertia time constant and the first preset threshold, the terminal voltage of the to-be-tested generator is subjected to step disturbance, the integrated mechanical power of the power system stabilizer is amplified by the first preset coefficient, and the wave is recorded to obtain the first waveform graph, the first target value is obtained based on the first waveform graph. The first calculation unit updates the first inertia time constant according to the preset adjustment step and the first target value, obtains the second inertia time constant, and based on the second inertia time constant and the first preset threshold, the terminal voltage of the to-be-tested generator is subjected to step disturbance, the integrated mechanical power of the power system stabilizer is amplified by the first preset coefficient, and the wave is recorded to obtain the second waveform graph, the first target value is obtained based on the second waveform graph. The second calculation unit corrects the second inertia time constant based on the preset adjustment step, the first target value and the second target value to obtain the corrected inertia time constant, based on the corrected inertia time constant and the first preset threshold, the terminal voltage of the to-be-tested generator is subjected to step disturbance, the integrated mechanical power of the power system stabilizer is amplified by the first preset coefficient, and the wave is recorded to obtain the third waveform graph, the first target value is obtained based on the third waveform graph. The first determination unit determines the corrected inertia time constant as the target inertia time constant when the absolute value of the third target value is less than or equal to the second preset threshold. The application is based on the mechanical integrated power output curve of the power system stabilizer to determine, through simple step disturbance operation, the inertia time constant of the generator set can be quickly calibrated. The device solves the problem of large error of unit inertia time constant in the prior art.

[0180] The above only describes the preferred embodiments of the application and is not intended to limit the application. Those skilled in the art can make various modifications and changes to the application. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the application shall be included in the protection scope of the application.

Claims

1. A method for determining the inertial time constant of a generator set, characterized in that, include: A first inertial time constant is obtained, and based on the first inertial time constant and a first preset threshold, a step disturbance is applied to the terminal voltage of the generator under test. The integrated mechanical power of the power system stabilizer is amplified and recorded using a first preset coefficient to obtain a first waveform. Based on the first waveform, the first pendulum pole value is determined to obtain the first target value. The first inertial time constant is updated according to the preset adjustment step size and the first target value to obtain the second inertial time constant. The terminal voltage of the generator under test is subjected to a step disturbance based on the second inertial time constant and the first preset threshold. The integrated mechanical power of the power system stabilizer is amplified and recorded using the first preset coefficient to obtain the second waveform. The first pendulum pole value is determined based on the second waveform to obtain the second target value. The second inertial time constant is corrected based on the preset adjustment step size, the first target value, and the second target value to obtain the corrected inertial time constant. The terminal voltage of the generator under test is subjected to a step disturbance based on the corrected inertial time constant and the first preset threshold. The integrated mechanical power of the power system stabilizer is amplified and recorded using the first preset coefficient to obtain a third waveform. The first pendulum pole value is determined based on the third waveform to obtain the third target value. If the absolute value of the third target value is less than or equal to the second preset threshold, the corrected inertial time constant is determined as the target inertial time constant. After determining the first pendulum pole value based on the third waveform chart and obtaining the third target value, the method further includes: In the first update step, if the absolute value of the third target value is greater than the second preset threshold, the first inertial time constant is updated based on the second inertial time constant, and the second inertial time constant is updated based on the corrected inertial time constant. The second update step involves updating the corresponding first target value based on the updated first inertial time constant, and updating the corresponding second target value based on the updated second inertial time constant. The third update step involves updating and correcting the updated second inertial time constant based on the preset adjustment step size, the updated first target value, and the updated second target value, to obtain the updated corrected inertial time constant. The calculation step involves updating the third target value based on the updated corrected inertial time constant. The first update step, the second update step, the third update step, and the calculation step are repeated at least once in sequence until the absolute value of the updated third target value is less than or equal to the second preset threshold, and the latest corrected inertial time constant is determined as the target inertial time constant.

2. The method according to claim 1, characterized in that, Based on the first inertial time constant and the first preset threshold, a step disturbance is applied to the terminal voltage of the generator under test. The synthesized mechanical power integral of the power system stabilizer is amplified by the first preset coefficient and the waveform is recorded to obtain the first waveform diagram, including: Substitute the first inertial time constant into the first preset formula to calculate the power gain coefficient of the power system stabilizer, and obtain the first gain coefficient; Based on the first gain coefficient, the terminal voltage of the generator under test is subjected to a step disturbance with the first preset threshold, and the integrated mechanical power of the power system stabilizer is amplified and recorded with the first preset coefficient to obtain the first waveform.

3. The method according to claim 1, characterized in that, The first inertial time constant is updated according to the preset adjustment step size and the first target value to obtain the second inertial time constant. Based on the second inertial time constant and the first preset threshold, the terminal voltage of the generator under test is subjected to a step disturbance. The synthesized mechanical power integral of the power system stabilizer is amplified by a first preset coefficient and the waveform is recorded to obtain the second waveform diagram, including: If the first target value is less than 0, the sum of the first inertial time constant and the preset adjustment step size is calculated to obtain the second inertial time constant; If the first target value is greater than 0, calculate the difference between the first inertial time constant and the preset adjustment step size to obtain the second inertial time constant; Substitute the second inertial time constant into the first preset formula to calculate the power gain coefficient of the power system stabilizer, and obtain the second gain coefficient; The generator terminal voltage under test is subjected to a step disturbance based on the second gain coefficient with the first preset threshold, and the integrated mechanical power of the power system stabilizer is amplified and recorded with the first preset coefficient to obtain the second waveform.

4. The method according to claim 1, characterized in that, The second inertial time constant is corrected based on the preset adjustment step size, the first target value, and the second target value to obtain the corrected inertial time constant, including: When the first target value is less than 0, the preset adjustment step size is determined as the target adjustment step size; when the first target value is greater than 0, the preset adjustment step size is reversed to obtain the target adjustment step size. Substituting the second inertial time constant, the target adjustment step size, the first target value, and the second target value into the second preset formula, the corrected inertial time constant is obtained.

5. The method according to claim 4, characterized in that... The second preset formula is ;in, The corrected inertial time constant, This is the second inertial time constant. For the first target value, The second target value, Adjust the step size for the target.

6. The method according to claim 1, characterized in that, Based on the corrected inertial time constant and the first preset threshold, a step disturbance is applied to the terminal voltage of the generator under test. The synthetic mechanical power integral of the power system stabilizer is amplified by a first preset coefficient and the waveform is recorded to obtain a third waveform diagram, including: Substituting the corrected inertia time constant into the first preset formula, the power gain coefficient of the power system stabilizer is calculated to obtain the third gain coefficient; Based on the third gain coefficient, the terminal voltage of the generator under test is subjected to a step disturbance with the first preset threshold. The integrated mechanical power of the power system stabilizer is amplified and recorded with the first preset coefficient to obtain the third waveform.

7. A device for measuring the inertial time constant of a generator set, characterized in that, The device includes: The first acquisition unit is used to acquire the first inertial time constant, and based on the first inertial time constant and the first preset threshold, to perform a step disturbance on the terminal voltage of the generator under test, and to amplify and record the integrated mechanical power of the power system stabilizer with the first preset coefficient to obtain a first waveform diagram. Based on the first waveform diagram, the first pendulum pole value is determined to obtain the first target value. The first calculation unit is used to update the first inertial time constant according to the preset adjustment step size and the first target value to obtain the second inertial time constant, and to perform a step disturbance on the terminal voltage of the generator under test based on the second inertial time constant and the first preset threshold, and to amplify and record the integrated mechanical power of the power system stabilizer with the first preset coefficient to obtain the second waveform diagram, and to determine the first pendulum pole value based on the second waveform diagram to obtain the second target value. The second calculation unit is used to correct the second inertial time constant based on the preset adjustment step size, the first target value and the second target value to obtain the corrected inertial time constant; to perform a step disturbance on the terminal voltage of the generator under test based on the corrected inertial time constant and the first preset threshold; to amplify and record the integrated mechanical power of the power system stabilizer using the first preset coefficient to obtain a third waveform; and to determine the first pendulum pole value based on the third waveform to obtain the third target value. The first determining unit is used to determine the corrected inertial time constant as the target inertial time constant when the absolute value of the third target value is less than or equal to the second preset threshold. The device further includes: The first update unit is used to perform the first update step. After determining the first pendulum pole value based on the third waveform and obtaining the third target value, if the absolute value of the third target value is greater than the second preset threshold, the first inertial time constant is updated based on the second inertial time constant, and the second inertial time constant is updated based on the corrected inertial time constant. The second update unit is used to perform the second update step, update the corresponding first target value based on the updated first inertial time constant, and update the corresponding second target value according to the updated second inertial time constant; The third update unit is used to perform the third update step, which updates and corrects the updated second inertial time constant based on the preset adjustment step size, the updated first target value, and the updated second target value, to obtain the updated corrected inertial time constant. The third calculation unit is used to perform calculation steps and update the third target value based on the updated corrected inertial time constant; The repeating unit is used to repeat the first update step, the second update step, the third update step, and the calculation step at least once in sequence until the absolute value of the updated third target value is less than or equal to the second preset threshold, and the latest corrected inertial time constant is determined as the target inertial time constant.

8. A computer-readable storage medium, characterized in that, The computer-readable storage medium includes a stored program, wherein, when the program is executed, it controls the device on which the computer-readable storage medium is located to perform the method according to any one of claims 1 to 6.

9. A generator set, characterized in that, include: One or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, the one or more programs comprising methods for performing any one of claims 1 to 6.

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