Method and device for measuring inertia time constant of generator set

Abstract

The invention provides a method and a device for measuring an inertia time constant of a generator set. The method comprises the following steps: performing step disturbance on the terminal voltage of a generator to be measured based on a first inertia time constant and a first preset threshold, amplifying and recording the synthetic mechanical power integral of the power system stabilizer by a first preset coefficient to obtain a first oscillogram, and determining a first swing point value based on the first oscillogram to obtain a first target value; updating the first inertia time constant according to a preset adjustment step length and a first target value to obtain a second inertia time constant, and further determining a second oscillogram and a second target value; correcting the second inertia time constant based on a preset adjustment step length, the first target value and the second target value to obtain a corrected inertia time constant, and further determining a third oscillogram and a third target value; and obtaining a target inertia time constant when the absolute value of the third target value is smaller than or equal to a second preset threshold. The method solves the problem that in the prior art, the inertia time constant error of a unit is large.

Description

Technical Field

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

[0002] Unit inertia time constant (T j ) can accurately and effectively characterize the rotational kinetic energy stored in the rotating part of the generator set, and is the main basis for determining the dynamic characteristics of the unit frequency and the dynamic characteristics of the large power grid (frequency stability and low-frequency oscillation, etc.). As the proportion of new energy in the new power system rises rapidly, the new power system faces the risk of a rapid decline in system rotation inertia.

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

[0004] The inertia time constant of common generator sets is generally determined in two ways. One is to use the manufacturer's design value, and the other is to use the measured value and further perform calculations. The method using the manufacturer's design value is based on the design value of the flywheel torque of the rotating equipment related to the rotor of the power generation equipment. This method does not take into account the interference caused by changes in water or gas during actual operation. The method using the measured value is to calculate the acceleration at the moment when the unit is unloading and the opening does not change. The acceleration in this method is difficult to measure accurately and is prone to large errors.

[0005] In summary, the prior art lacks an accurate method for calculating the inertia time constant of a generator set. Summary of the invention

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

[0007] In order to achieve the above-mentioned purpose, according to one aspect of the present application, a method for determining the inertia time constant of a generator set is provided, comprising: obtaining a first inertia time constant, and based on the first inertia time constant and a first preset threshold, performing a step disturbance on the terminal voltage of the generator to be measured, amplifying and recording the synthetic mechanical power integral of the power system stabilizer with a first preset coefficient to obtain a first waveform diagram, and marking a first swing pole value based on the second waveform diagram to obtain a first target value; 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 a step disturbance on the terminal voltage of the generator to be measured based on the second inertia time constant and the first preset threshold, and amplifying the synthetic mechanical power integral of the power system stabilizer with the first preset coefficient to obtain a first waveform diagram; The synthetic mechanical power integral is amplified and recorded to obtain a second waveform diagram, and the first pendulum pole value is marked based on the third waveform diagram to obtain a second target value; 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, and 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 value, and the synthetic mechanical power integral of the power system stabilizer is amplified and recorded with the first preset coefficient to obtain a third waveform diagram, and the first pendulum pole value is marked based on the fourth waveform diagram to obtain a third target value; when the absolute value of the third target value is less than or equal to the second preset threshold value, the corrected inertia time constant is determined as the target inertia time constant.

[0008] Optionally, based on the first inertia time constant and the first preset threshold, a step disturbance is made to the terminal voltage of the generator to be tested, and the synthetic mechanical power integral of the power system stabilizer is amplified and recorded with a first preset coefficient to obtain a first waveform diagram, including: substituting the first inertia time constant into a first preset formula to calculate the power gain coefficient of the power system stabilizer to obtain a first gain coefficient; based on the first gain coefficient, a step disturbance is made to the terminal voltage of the generator to be tested with the first preset threshold, and the synthetic mechanical power integral of the power system stabilizer is amplified and recorded with the first preset coefficient to obtain the first waveform diagram.

[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 based on the second inertia time constant and the first preset threshold, a step disturbance is performed on the terminal voltage of the generator to be tested, and the synthetic mechanical power integral of the power system stabilizer is amplified and recorded with a first preset coefficient to obtain a second waveform diagram, including: when the first target value is less than 0, the sum of the first inertia time constant and the preset adjustment step is calculated to obtain the second inertia time constant; when the first target value is greater than 0, the difference between the first inertia time constant and the preset adjustment step is calculated to obtain the second inertia time constant; the second inertia time constant is substituted into the first preset formula to calculate the power gain coefficient of the power system stabilizer to obtain a second gain coefficient; based on the second gain coefficient, a step disturbance is performed on the terminal voltage of the generator to be tested with the first preset threshold, and the synthetic mechanical power integral of the power system stabilizer is amplified and recorded with the first preset coefficient to obtain the second waveform diagram.

[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: when the first target value is less than 0, determining the preset adjustment step as the target adjustment step, and when the first target value is greater than 0, taking the opposite 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 Among them, T` j is the modified inertia time constant, T j-2 is the second inertia time constant, a 1 is the first target value, a 2 is the second target value, and Δt` is the target adjustment step.

[0012] Optionally, based on the corrected inertia time constant, the first waveform diagram and the first preset threshold, a step disturbance is made to the terminal voltage of the generator to be tested, and the synthetic mechanical power integral of the power system stabilizer is amplified and recorded with a first preset coefficient to obtain a third waveform diagram, including: substituting 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; based on the third gain coefficient and the first waveform diagram, a step disturbance is made to the terminal voltage of the generator to be tested with the first preset threshold, and the synthetic mechanical power integral of the power system stabilizer is amplified and recorded with the first preset coefficient to obtain the third waveform diagram.

[0013] Optionally, after the first pendulum pole value is identified based on the third waveform diagram and the third target value is obtained, the method further includes: a first updating step, in which, when the absolute value of the third target value is greater than the second preset threshold value, the first inertia time constant is updated based on the second inertia time constant, and the second inertia time constant is updated based on the modified inertia time constant; a second updating step, in which 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; a third updating step, in which the second inertia time constant after modification 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; a calculation step, in which the third target value is updated based on the updated modified inertia time constant; and the first updating step, the second updating step, the third updating 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 value, and the latest modified inertia time constant is determined as the target inertia time constant.

[0014] According to another aspect of the present application, a device for measuring the inertia time constant of a generator set is provided, the device comprising: a first acquisition unit, used to monitor the synthetic mechanical power output by the power system stabilizer, and amplify the synthetic mechanical power with a first preset coefficient to obtain a first waveform diagram; a second acquisition unit, used to obtain the first inertia time constant, and based on the first inertia time constant, the first waveform diagram and a first preset threshold value, perform a step disturbance on the terminal voltage of the generator to be measured to obtain a second waveform diagram, and based on the second inertia time constant, the first waveform diagram and a first preset threshold value, mark a first swing pole value to obtain a first target value; a first calculation unit, used 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, and based on the second inertia time constant, the first waveform diagram Figure and the first preset threshold value are used to perform a step disturbance on the terminal voltage of the generator to be tested to obtain a third waveform diagram, and the first swing pole value is marked based on the third waveform diagram to obtain a second target value; a second calculation unit is used 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, and the terminal voltage of the generator to be tested is performed a step disturbance based on the first waveform diagram and the first preset threshold value to obtain a fourth waveform diagram, and the first swing pole value is marked based on the fourth waveform diagram to obtain a third target value; a first determination unit is used to determine 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.

[0015] According to another aspect of the present application, a computer-readable storage medium is provided, wherein the computer-readable storage medium includes a stored program, wherein when the program is executed, the device where the computer-readable storage medium is located is controlled to execute any one of the methods described.

[0016] According to 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 are configured to be executed by the one or more processors, and the one or more programs include methods for executing any one of the methods described.

[0017] By applying the technical solution of the present application, in the method for determining the inertia time constant of the above-mentioned generator set, first, a first inertia time constant is obtained, and based on the above-mentioned first inertia time constant and the first preset threshold, a step disturbance is performed on the terminal voltage of the generator to be measured, and the synthetic mechanical power integral of the power system stabilizer is amplified and recorded with a first preset coefficient to obtain a first waveform diagram, and a first swing pole value is marked based on the above-mentioned first waveform diagram to obtain a first target value; then, the above-mentioned first inertia time constant is updated according to the preset adjustment step size and the above-mentioned first target value to obtain a second inertia time constant, and based on the above-mentioned second inertia time constant and the above-mentioned first preset threshold, a step disturbance is performed on the terminal voltage of the above-mentioned generator to be measured, and the synthetic mechanical power integral of the power system stabilizer is amplified with the above-mentioned first preset coefficient. The first inertia time constant is amplified and recorded to obtain a second waveform diagram, and the first pendulum pole value is marked based on the second waveform diagram to obtain a second target 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, and 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 value, and the synthetic mechanical power integral of the power system stabilizer is amplified and recorded with the first preset coefficient to obtain a third waveform diagram, and the first pendulum pole value is marked based on the third waveform diagram to obtain a third target value; finally, when the absolute value of the third target value is less than or equal to the second preset threshold value, the corrected inertia time constant is determined as the target inertia time constant. The present application makes a judgment based on the mechanical synthetic power output curve of the power system stabilizer, and the inertia time constant of the generator set can be quickly calibrated through a simple step disturbance operation. This method solves the problem of large error in the inertia time constant of the unit in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

[0021] Figure 4 shows an output curve of synthetic mechanical power under different inertia time constants provided according to an embodiment of the present application;

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

[0023] The above drawings include the following reference numerals:

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

[0025] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0026] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0027] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0028] As introduced in the background technology, the prior art lacks an accurate method for calculating the inertia time constant of a generator set. In order to solve the problem of large errors in determining the inertia time constant based on simulation calculations in the prior art, the embodiments of the present application provide a method, device, computer-readable storage medium and generator set for measuring the inertia time constant of a generator set.

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

[0030] The method embodiments provided in the embodiments of the present application can be executed in a mobile terminal, a computer terminal or a similar computing device. Taking running on a mobile terminal as an example, Figure 1FIG. 1 is a hardware structure block diagram of a mobile terminal for determining a method for determining an inertia time constant of a generator set according to an embodiment of the present invention. Figure 1 As shown, the mobile terminal may include one or more ( Figure 1 Only one is shown in the figure) a processor 102 (the processor 102 may include but is not limited to a processing device such as a microprocessor MCU or a programmable logic device FPGA) and a memory 104 for storing data, wherein the mobile terminal may also include a transmission device 106 and an input / output device 108 for communication functions. It can be understood by those skilled in the art that Figure 1 The structure shown is only for illustration and does not limit the structure of the mobile terminal. Figure 1 More or fewer components as shown, or with Figure 1 Different configurations shown.

[0031] The memory 104 can be used to store computer programs, for example, software programs and modules of application software, such as the computer program corresponding to the display method of device information in the embodiment of the present invention. The processor 102 executes various functional applications and data processing by running the computer program stored in the memory 104, that is, the above method is implemented. The memory 104 may include a high-speed random access memory, and may also include a non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 104 may further include a memory remotely arranged relative to the processor 102, and these remote memories can be connected to the mobile terminal via a network. Examples of the above-mentioned 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 above-mentioned specific examples of the network may include a wireless network provided by a communication provider of the mobile terminal. In one example, the transmission device 106 includes a network adapter (Network Interface Controller, referred to as 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 may be a radio frequency (RF) module, which is used to communicate with the Internet wirelessly.

[0032] In this embodiment, a method for measuring the inertia time constant of a generator set running on a mobile terminal, a computer terminal or a similar computing device is provided. 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 can be executed in an order different from that shown here.

[0033] Figure 2 FIG. 1 is a flow chart of a method for determining the inertia time constant of a generator set according to an embodiment of the present application. Figure 2 As shown, the method comprises the following steps:

[0034] Step S201, obtaining a first inertia time constant, and performing a step disturbance on the terminal voltage of the generator to be tested based on the first inertia time constant and a first preset threshold, amplifying the synthetic mechanical power integral of the power system stabilizer with a first preset coefficient and recording the waveform, obtaining a first waveform diagram, and marking a first pendulum pole value based on the first waveform diagram to obtain a first target value;

[0035] In one embodiment, a single-machine infinite system is used as an example for explanation. The wiring diagram of the single-machine infinite system is as follows: Figure 3 shown.

[0036] Specifically, the initial value of the inertia time constant Tj=9.6, that is, the above-mentioned first inertia time constant, is obtained, and then the power gain coefficient of the power system stabilizer (PSS) is calculated based on the above-mentioned first inertia time constant. Based on the above-mentioned parameters, the synthetic mechanical power integral is amplified 1000 times from the power system stabilizer to ensure that the recorded image is easy to analyze and calculate. The amplified mechanical synthetic power is used as the output point of the recording. The terminal voltage of the generator to be tested is disturbed by a step of -3%, and the recording is performed to obtain the above-mentioned first waveform diagram, as shown in FIG. Figure 4 As shown in C1, the curve C1 is analyzed and the first pendulum extreme point value a1 is calibrated to obtain the above-mentioned first target value.

[0037] It is understood that the initial value of the inertia time constant is determined based on the unit design parameters or the measured value of the load rejection or the conventional estimated value. Figure 4 Where Tj=11.6, a=0.0046 is the reference waveform obtained by recording the actual inertia time constant for comparison.

[0038] Step S202, updating the first inertia time constant according to the preset adjustment step and the first target value to obtain a second inertia time constant, and performing a step disturbance on the terminal voltage of the generator to be tested based on the second inertia time constant and the first preset threshold, amplifying the synthetic mechanical power integral of the power system stabilizer with the first preset coefficient and recording the waveform to obtain a second waveform diagram, and marking the first pendulum pole value based on the second waveform diagram to obtain a second target value;

[0039] Specifically, the adjustment step Δt of the inertia time constant is obtained, and the preset adjustment step is obtained to update the first inertia time constant to obtain the second inertia time constant, and then the power gain coefficient of the power system stabilizer (PSS) is calculated based on the second inertia time constant. Based on the above parameters, the terminal voltage of the generator to be tested is disturbed by a step of -3%, and the waveform is recorded to obtain the second waveform diagram, as shown in FIG. Figure 4 As shown in C2, analyze curve C2 and calibrate the first pendulum extreme point value a2 therein to obtain the above-mentioned second target value.

[0040] Step S203, 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, 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, the synthetic mechanical power integral of the power system stabilizer is amplified and recorded with the first preset coefficient to obtain a third waveform diagram, and the first pendulum pole value is marked based on the third waveform diagram to obtain a third target value;

[0041] Specifically, a 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. Based on the above parameters, the terminal voltage of the generator to be tested is disturbed by a step of -3%, and the waveform is recorded to obtain the third waveform diagram, as shown in FIG. Figure 4 As shown in C`, analyze curve C` and calibrate the first pendulum extreme point value a` to obtain the above-mentioned third target value.

[0042] Step S204: when the absolute value of the third target value is less than or equal to the second preset threshold, the modified inertia time constant is determined as the target inertia time constant.

[0043] 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.

[0044] Through this embodiment, first, a first inertia time constant is obtained, and based on the first inertia time constant and the first preset threshold, a step disturbance is performed on the terminal voltage of the generator to be tested, and the synthetic mechanical power integral of the power system stabilizer is amplified and recorded with the first preset coefficient to obtain a first waveform diagram, and a first swing pole value is marked based on the first waveform diagram to obtain a first target 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 based on the second inertia time constant and the first preset threshold, a step disturbance is performed on the terminal voltage of the generator to be tested, and the synthetic mechanical power integral of the power system stabilizer is amplified and recorded with the first preset coefficient to obtain a first waveform diagram. A second waveform diagram is provided, and the first pendulum pole value is marked based on the second waveform diagram to obtain the second target 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 the corrected inertia time constant, and the terminal voltage of the generator to be tested is subjected to a step disturbance based on the corrected inertia time constant and the first preset threshold value, and the synthetic mechanical power integral of the power system stabilizer is amplified and recorded with the first preset coefficient to obtain a third waveform diagram, and the first pendulum pole value is marked based on the third waveform diagram to obtain the third target value; finally, when the absolute value of the third target value is less than or equal to the second preset threshold value, the corrected inertia time constant is determined as the target inertia time constant. The present application makes a judgment based on the mechanical synthetic power output curve of the power system stabilizer, and can quickly calibrate the inertia time constant of the generator set through a simple step disturbance operation. This method solves the problem of large error in the inertia time constant of the unit in the prior art.

[0045] In order to obtain the first waveform diagram, in an optional implementation, the step S201 includes:

[0046] Step S2011, substituting the first inertia time constant into a first preset formula to calculate the power gain coefficient of the power system stabilizer to obtain a first gain coefficient;

[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, and the parameter is adjusted and set to obtain the first gain coefficient.

[0048] Step S2012: Based on the first gain coefficient, the terminal voltage of the generator to be tested is subjected to a step disturbance at the first preset threshold value, and the synthetic mechanical power integral of the power system stabilizer is amplified and recorded at the first preset coefficient to obtain the first waveform diagram.

[0049] Specifically, based on the first gain coefficient, the terminal voltage of the generator to be tested is subjected to a step disturbance at the first preset threshold and recorded to obtain the first waveform diagram, such as Figure 4 As shown in the middle curve C1.

[0050] It can be understood that the first pendulum extreme point a 1 =-0.1053.

[0051] In order to obtain the second waveform diagram, in an optional implementation, the step S202 includes:

[0052] Step S2021, when the first target value is less than 0, calculating the sum of the first inertia time constant and the preset adjustment step length to obtain the second inertia time constant;

[0053] Specifically, such as a 1 <0, then according to T j-2 =T j-1 +Δt calculates the above-mentioned second inertia time constant.

[0054] Step S2022, when the first target value is greater than 0, calculating the difference between the first inertia time constant and the preset adjustment step length to obtain the second inertia time constant;

[0055] Specifically, such as a 1 >0, then according to T j-2 =T j-1 -Δt calculates the above-mentioned second inertia time constant.

[0056] Step S2023, substituting the second inertia time constant into the first preset formula to calculate the power gain coefficient of the power system stabilizer to obtain a second gain coefficient;

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

[0058] In one embodiment, if Figure 4 As shown by the middle curve C1, due to a 1 =-0.1053<0, then T j-2 =9.6+1=10.6s.

[0059] Step S2024, based on the second gain coefficient, the terminal voltage of the generator to be tested is subjected to a step disturbance at the first preset threshold value, and the synthetic mechanical power integral of the power system stabilizer is amplified and recorded at the first preset coefficient to obtain the second waveform diagram.

[0060] Specifically, based on the second gain coefficient, the terminal voltage of the generator to be tested is subjected to a step disturbance at the first preset threshold and recorded to obtain the second waveform diagram, such as Figure 4 As shown in the middle curve C2.

[0061] It can be understood that the measured value of the first pendulum extreme point a of curve C2 is 2 =-0.05.

[0062] In order to obtain the above-mentioned corrected inertia time constant, in an optional implementation manner, the above-mentioned step S203 includes:

[0063] Step S2031, when the first target value is less than 0, the preset adjustment step is determined as the target adjustment step; when the first target value is greater than 0, the preset adjustment step is negated to obtain the target adjustment step;

[0064] Specifically, such as a 1 <0, let Δt'=Δt; if a 1 >0, then Δt'=Δt, and the above target adjustment step size is obtained.

[0065] Step S2032: 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 modified inertia time constant.

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

[0067] In order to calculate the above-mentioned modified inertia time constant, the second preset formula is: Among them, T` j To correct the inertia time constant, T j-2 is the second inertia time constant, a 1 is the first target value, a 2 is the second target value, and Δt` is the target adjustment step size.

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

[0069] Step S2033, substituting the modified inertia time constant into the first preset formula to calculate the power gain coefficient of the power system stabilizer to obtain a third gain coefficient;

[0070] Specifically, the modified inertia time constant is substituted into the first preset formula to calculate the power gain coefficient of the power system stabilizer: This parameter is adjusted and set to obtain the third gain coefficient mentioned above.

[0071] In one embodiment, if Figure 4 As shown by the curves C1 and C2,

[0072] Step S2034, based on the third gain coefficient and the first waveform diagram, the terminal voltage of the generator to be tested is subjected to a step disturbance at the first preset threshold value, and the synthetic mechanical power integral of the power system stabilizer is amplified and recorded at the first preset coefficient to obtain the third waveform diagram.

[0073] Specifically, based on the third gain coefficient, the terminal voltage of the generator to be tested is subjected to a step disturbance at the first preset threshold and recorded to obtain the third waveform diagram, such as Figure 4 As shown in the middle curve C`.

[0074] It can be understood that the measured value of the first pendulum extreme point of curve C' is a'=0.0003.

[0075] In order to further correct the large deviation of the corrected inertia time coefficient, in an optional implementation, after the first pendulum pole value is determined based on the third waveform diagram to obtain the third target value, the method further includes:

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

[0077] Specifically, in the above embodiment, when the absolute value of the above third target value is greater than the above second preset threshold value, that is, |a′|>ε, it is determined that the above modified inertia time coefficient deviation is large, and T is set j-2 As the first point, set the calibration value T' j For point 2.

[0078] Step S302, a second updating step, updating the corresponding first target value based on the updated first inertia time constant, and updating the corresponding second target value based on 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, a third updating step, updating and correcting the updated 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 updated second inertia time constant is updated and corrected 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.

[0082] Step S304, a calculation step, updating the third target value based on the updated modified inertia time constant;

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

[0084] Step S305, repeat the above-mentioned first updating step, the above-mentioned second updating step, the above-mentioned third updating step and the above-mentioned calculation step at least once in sequence, until the absolute value of the above-mentioned third target value after update is less than or equal to the above-mentioned second preset threshold value, and determine the latest above-mentioned corrected inertia time constant as the above-mentioned target inertia time constant.

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

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

[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 in the embodiment of the present application can be used to execute the method for measuring the inertia time constant of a generator set provided in the embodiment of the present application. The device is used to implement the above-mentioned embodiments and preferred implementation modes, and the descriptions that have been made will not be repeated. As used below, the term "module" can implement a combination of software and / or hardware for a predetermined function. Although the device described in the following embodiments is preferably implemented in software, the implementation of hardware, or a combination of software and hardware, is also possible and conceived.

[0088] The following is an introduction to the device for measuring the inertia time constant of a generator set provided in an embodiment of the present application.

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

[0090] A first acquisition unit 10 is used to acquire a first inertia time constant, and based on the first inertia time constant and a first preset threshold, perform a step disturbance on the terminal voltage of the generator to be tested, amplify the synthetic mechanical power integral of the power system stabilizer with a first preset coefficient and record the waveform to obtain a first waveform diagram, and identify a first pendulum pole value based on the first waveform diagram to obtain a first target value;

[0091] In one embodiment, a single-machine infinite system is used as an example for explanation. The wiring diagram of the single-machine infinite system is as follows: Figure 3 shown.

[0092] Specifically, the initial value of the inertia time constant Tj=9.6, that is, the above-mentioned first inertia time constant, is obtained, and then the power gain coefficient of the power system stabilizer (PSS) is calculated based on the above-mentioned first inertia time constant. Based on the above-mentioned parameters, the synthetic mechanical power integral is amplified 1000 times from the power system stabilizer to ensure that the recorded image is easy to analyze and calculate. The amplified mechanical synthetic power is used as the output point of the recording. The terminal voltage of the generator to be tested is disturbed by a step of -3%, and the recording is performed to obtain the above-mentioned first waveform diagram, as shown in FIG. Figure 4 As shown in C1, the curve C1 is analyzed and the first pendulum extreme point value a1 is calibrated to obtain the above-mentioned first target value.

[0093] It is understood that the initial value of the inertia time constant is determined based on the unit design parameters or the measured value of the load rejection or the conventional estimated value. Figure 4 Where Tj=11.6, a=0.0046 is the reference waveform obtained by recording the actual inertia time constant for comparison.

[0094] The first calculation unit 30 is used 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, and based on the second inertia time constant and the first preset threshold, perform a step disturbance on the terminal voltage of the generator to be tested, amplify the synthetic mechanical power integral of the power system stabilizer with the first preset coefficient and record the waveform to obtain a second waveform diagram, and identify the first pendulum pole value based on the second waveform diagram to obtain a second target value;

[0095] Specifically, the adjustment step Δt of the inertia time constant is obtained, and the preset adjustment step is obtained to update the first inertia time constant to obtain the second inertia time constant, and then the power gain coefficient of the power system stabilizer (PSS) is calculated based on the second inertia time constant. Based on the above parameters, the terminal voltage of the generator to be tested is disturbed by a step of -3%, and the waveform is recorded to obtain the second waveform diagram, as shown in FIG. Figure 4 As shown in C2, analyze curve C2 and calibrate the first pendulum extreme point value a2 therein to obtain the above-mentioned second target value.

[0096] The second calculation unit 40 is used 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, perform a step disturbance on the terminal voltage of the generator to be tested based on the corrected inertia time constant and the first preset threshold, amplify the synthetic mechanical power integral of the power system stabilizer with the first preset coefficient and record the waveform to obtain a third waveform diagram, and identify the first pendulum pole value based on the third waveform diagram to obtain a third target value;

[0097] Specifically, a 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. Based on the above parameters, the terminal voltage of the generator to be tested is disturbed by a step of -3%, and the waveform is recorded to obtain the third waveform diagram, as shown in FIG. Figure 4 As shown in C`, analyze curve C` and calibrate the first pendulum extreme point value a` to obtain the above-mentioned third target value.

[0098] The first determining unit 50 is configured to determine the modified inertia time constant as a target inertia time constant when the absolute value of the third target value is less than or equal to a 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] Through this embodiment, the first acquisition unit acquires the first inertia time constant, and based on the first inertia time constant and the first preset threshold, performs a step disturbance on the terminal voltage of the generator to be tested, amplifies and records the synthetic mechanical power integral of the power system stabilizer with the first preset coefficient, and obtains a first waveform diagram, and marks the first swing pole value based on the first waveform diagram to obtain a first target value; the first calculation unit updates the first inertia time constant according to the preset adjustment step and the first target value to obtain a second inertia time constant, and based on the second inertia time constant and the first preset threshold, performs a step disturbance on the terminal voltage of the generator to be tested, amplifies and records the synthetic mechanical power integral of the power system stabilizer with the first preset coefficient, and obtains the first The second waveform diagram is used, and the first pendulum pole value is marked based on the second waveform diagram to obtain the second target value; 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, and the terminal voltage of the generator to be tested is subjected to a step disturbance based on the corrected inertia time constant and the first preset threshold value, and the synthetic mechanical power integral of the power system stabilizer is amplified and recorded with the first preset coefficient to obtain the third waveform diagram, and the first pendulum pole value is marked based on the third waveform diagram to obtain the third target value; 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 value. The present application makes a judgment based on the mechanical synthetic power output curve of the power system stabilizer, and can quickly calibrate the inertia time constant of the generator set through a simple step disturbance operation. This method solves the problem of large error in the inertia time constant of the unit in the prior art.

[0101] In order to obtain the second waveform diagram, in an optional implementation manner, the first acquisition unit includes:

[0102] A first calculation module, used for substituting the first inertia time constant into a first preset formula to calculate the power gain coefficient of the power system stabilizer to obtain a first gain coefficient;

[0103] 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, and the parameter is adjusted and set to obtain the first gain coefficient.

[0104] The first processing module is used to perform a step disturbance on the terminal voltage of the generator to be tested at the first preset threshold based on the first gain coefficient, amplify the synthetic mechanical power integral of the power system stabilizer at the first preset coefficient and record the waveform to obtain the first waveform diagram.

[0105] Specifically, based on the first gain coefficient, the terminal voltage of the generator to be tested is subjected to a step disturbance at the first preset threshold and recorded to obtain the first waveform diagram, such as Figure 4 As shown in the middle curve C1.

[0106] It can be understood that the first pendulum extreme point a 1 =-0.1053.

[0107] In order to obtain the second waveform diagram, in an optional implementation manner, the first calculation unit includes:

[0108] a second calculation module, configured to calculate the sum of the first inertia time constant and the preset adjustment step length to obtain the second inertia time constant when the first target value is less than 0;

[0109] Specifically, such as a 1 <0, then according to T j-2 =T j-1 +Δt calculates the above-mentioned second inertia time constant.

[0110] a third calculation module, configured to calculate the difference between the first inertia time constant and the preset adjustment step length to obtain the second inertia time constant when the first target value is greater than 0;

[0111] Specifically, such as a 1 >0, then according to T j-2 =T j-1 -Δt calculates the above-mentioned second inertia time constant.

[0112] A fourth calculation module is provided, which is configured to substitute the second inertia time constant into the first preset formula to calculate the power gain coefficient of the power system stabilizer to obtain a second gain coefficient;

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

[0114] In one embodiment, if Figure 4 As shown by the middle curve C1, due to a 1 =-0.1053<0, then T j-2 =9.6+1=10.6s.

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

[0116] Specifically, based on the second gain coefficient, the terminal voltage of the generator to be tested is subjected to a step disturbance at the first preset threshold and recorded to obtain the second waveform diagram, such as Figure 4 As shown in the middle curve C2.

[0117] It can be understood that the measured value of the first pendulum extreme point a of curve C2 is 2 =-0.05.

[0118] In order to obtain the above-mentioned modified inertia time constant, in an optional implementation manner, the above-mentioned second calculation unit includes:

[0119] a determination module, configured to determine the preset adjustment step length as the target adjustment step length when the first target value is less than 0, and to obtain the target adjustment step length by taking the inverse of the preset adjustment step length when the first target value is greater than 0;

[0120] Specifically, such as a 1 <0, let Δt'=Δt; if a 1 >0, then Δt'=Δt, and the above target adjustment step size is obtained.

[0121] The fifth calculation module is used 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 modified inertia time constant.

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

[0123] In order to calculate the above-mentioned modified inertia time constant, in an optional implementation manner, the second preset formula is: Among them, T` j To correct the inertia time constant, T j-2 is the second inertia time constant, a 1 is the first target value, a 2 is the second target value, and Δt` is the target adjustment step size.

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

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

[0126] A sixth calculation module, used for substituting the modified inertia time constant into the 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: This parameter is adjusted and set to obtain the third gain coefficient mentioned above.

[0128] In one embodiment, if Figure 4 As shown by the curves C1 and C2,

[0129] The third processing module is used to perform a step disturbance on the terminal voltage of the generator to be tested with the first preset threshold value based on the third gain coefficient and the first waveform diagram, and to amplify and record the synthetic mechanical power integral of the power system stabilizer with the first preset coefficient to obtain the third waveform diagram.

[0130] Specifically, based on the third gain coefficient, the terminal voltage of the generator to be tested is subjected to a step disturbance at the first preset threshold and recorded to obtain the third waveform diagram, such as Figure 4 As shown in the middle curve C`.

[0131] It can be understood that the measured value of the first pendulum extreme point of curve C' is a'=0.0003.

[0132] In order to further perform correction on the basis of the large deviation of the corrected inertia time coefficient, in an optional implementation manner, the device further includes:

[0133] a first updating unit, configured to, after the first pendulum pole value is identified based on the fourth waveform diagram and a third target value is obtained, perform a first updating step, and when an absolute value of the third target value is greater than the second preset threshold value, update the first inertia time constant based on the second inertia time constant, and update the second inertia time constant based on the corrected inertia time constant;

[0134] Specifically, in the above embodiment, when the absolute value of the above third target value is greater than the above second preset threshold value, that is, |a′|>ε, it is determined that the above modified inertia time coefficient deviation is large, and T is set j-2 As the first point, set the calibration value T' j For point 2.

[0135] a second updating unit, configured to execute a second updating step, updating the corresponding first target value based on the updated first inertia time constant, and updating 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] A third updating unit is used to perform a third updating step, to update and correct the updated 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;

[0138] Specifically, the updated second inertia time constant is updated and corrected 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.

[0139] A third calculation unit, configured to execute a calculation step to update the third target value based on the updated modified inertia time constant;

[0140] Specifically, in the calculation step, the third target value is updated based on the updated corrected inertia time constant.

[0141] A repeating unit is used to sequentially repeat the first updating step, the second updating step, the third updating step and the calculating step at least once, until the absolute value of the third target value after updating is less than or equal to the second preset threshold value, and the latest corrected inertia time constant is determined 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 in sequence at least once until the absolute value of the third target value is less than or equal to the second preset threshold value, and the corrected inertia time constant is determined as the target inertia time constant.

[0143] The above-mentioned generator set inertia time constant determination device includes a processor and a memory, and the above-mentioned first acquisition unit, first calculation unit, second calculation unit and first determination unit are all stored in the memory as program units, and the processor executes the above-mentioned program units stored in the memory to realize corresponding functions. The above-mentioned modules are all located in the same processor; or, the above-mentioned modules are located in different processors in any combination.

[0144] The processor includes a kernel, which calls the corresponding program unit from the memory. One or more kernels can be set, and the accuracy of the inertia time constant calculation can be improved by adjusting the kernel parameters.

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

[0146] An embodiment of the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium includes a stored program, wherein when the program is executed, the device where the computer-readable storage medium is located is controlled to execute the method for measuring the inertia time constant of the generator set.

[0147] Specifically, the method for determining the inertia time constant of a generator set includes:

[0148] Step S201, obtaining a first inertia time constant, and performing a step disturbance on the terminal voltage of the generator to be tested based on the first inertia time constant and a first preset threshold, amplifying the synthetic mechanical power integral of the power system stabilizer with a first preset coefficient and recording the waveform, obtaining a first waveform diagram, and marking a first pendulum pole value based on the first waveform diagram to obtain a first target value;

[0149] Step S202, updating the first inertia time constant according to the preset adjustment step and the first target value to obtain a second inertia time constant, and performing a step disturbance on the terminal voltage of the generator to be tested based on the second inertia time constant and the first preset threshold, amplifying the synthetic mechanical power integral of the power system stabilizer with the first preset coefficient and recording the waveform to obtain a second waveform diagram, and marking the first pendulum pole value based on the second waveform diagram to obtain a second target value;

[0150] Step S203, 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, 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, the synthetic mechanical power integral of the power system stabilizer is amplified and recorded with the first preset coefficient to obtain a third waveform diagram, and the first pendulum pole value is marked based on the third waveform diagram to obtain a third target value;

[0151] Step S204: when the absolute value of the third target value is less than or equal to the second preset threshold, the modified inertia time constant is determined as the target inertia time constant.

[0152] An embodiment of the present invention provides a processor, and the processor is used to run a program, wherein the method for measuring the inertia time constant of the generator set is executed when the program is run.

[0153] Specifically, the method for determining the inertia time constant of a generator set includes:

[0154] Step S201, obtaining a first inertia time constant, and performing a step disturbance on the terminal voltage of the generator to be tested based on the first inertia time constant and a first preset threshold, amplifying the synthetic mechanical power integral of the power system stabilizer with a first preset coefficient and recording the waveform, obtaining a first waveform diagram, and marking a first pendulum pole value based on the first waveform diagram to obtain a first target value;

[0155] Step S202, updating the first inertia time constant according to the preset adjustment step and the first target value to obtain a second inertia time constant, and performing a step disturbance on the terminal voltage of the generator to be tested based on the second inertia time constant and the first preset threshold, amplifying the synthetic mechanical power integral of the power system stabilizer with the first preset coefficient and recording the waveform to obtain a second waveform diagram, and marking the first pendulum pole value based on the second waveform diagram to obtain a second target value;

[0156] Step S203, 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, 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, the synthetic mechanical power integral of the power system stabilizer is amplified and recorded with the first preset coefficient to obtain a third waveform diagram, and the first pendulum pole value is marked based on the third waveform diagram to obtain a third target value;

[0157] Step S204: when the absolute value of the third target value is less than or equal to the second preset threshold, the modified inertia time constant is determined as the target inertia time constant.

[0158] An embodiment of the present invention provides a generator set, the generator set comprising a processor, a memory, and a program stored in the memory and executable on the processor, and when the processor executes the program, at least the following steps are implemented:

[0159] Step S201, obtaining a first inertia time constant, and performing a step disturbance on the terminal voltage of the generator to be tested based on the first inertia time constant and a first preset threshold, amplifying the synthetic mechanical power integral of the power system stabilizer with a first preset coefficient and recording the waveform, obtaining a first waveform diagram, and marking a first pendulum pole value based on the first waveform diagram to obtain a first target value;

[0160] Step S202, updating the first inertia time constant according to the preset adjustment step and the first target value to obtain a second inertia time constant, and performing a step disturbance on the terminal voltage of the generator to be tested based on the second inertia time constant and the first preset threshold, amplifying the synthetic mechanical power integral of the power system stabilizer with the first preset coefficient and recording the waveform to obtain a second waveform diagram, and marking the first pendulum pole value based on the second waveform diagram to obtain a second target value;

[0161] Step S203, 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, 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, the synthetic mechanical power integral of the power system stabilizer is amplified and recorded with the first preset coefficient to obtain a third waveform diagram, and the first pendulum pole value is marked based on the third waveform diagram to obtain a third target value;

[0162] Step S204: when the absolute value of the third target value is less than or equal to the second preset threshold, the modified inertia time constant is determined as the target inertia time constant.

[0163] The present application also provides a computer program product, which, when executed on a data processing device, is suitable for executing a program for initializing at least the following method steps:

[0164] Step S201, obtaining a first inertia time constant, and performing a step disturbance on the terminal voltage of the generator to be tested based on the first inertia time constant and a first preset threshold, amplifying the synthetic mechanical power integral of the power system stabilizer with a first preset coefficient and recording the waveform, obtaining a first waveform diagram, and marking a first pendulum pole value based on the first waveform diagram to obtain a first target value;

[0165] Step S202, updating the first inertia time constant according to the preset adjustment step and the first target value to obtain a second inertia time constant, and performing a step disturbance on the terminal voltage of the generator to be tested based on the second inertia time constant and the first preset threshold, amplifying the synthetic mechanical power integral of the power system stabilizer with the first preset coefficient and recording the waveform to obtain a second waveform diagram, and marking the first pendulum pole value based on the second waveform diagram to obtain a second target value;

[0166] Step S203, 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, 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, the synthetic mechanical power integral of the power system stabilizer is amplified and recorded with the first preset coefficient to obtain a third waveform diagram, and the first pendulum pole value is marked based on the third waveform diagram to obtain a third target value;

[0167] Step S204: when the absolute value of the third target value is less than or equal to the second preset threshold, the modified inertia time constant is determined as the target inertia time constant.

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

[0169] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0170] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0171] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0172] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

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

[0174] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0175] Computer readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. Information can be 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 erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0176] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

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

[0178] 1) The method for determining the inertia time constant of a generator set of the present application comprises the following steps: first, obtaining a first inertia time constant, and based on the first inertia time constant and a first preset threshold, performing a step disturbance on the terminal voltage of the generator to be measured, amplifying and recording the synthetic mechanical power integral of the power system stabilizer with a first preset coefficient, obtaining a first waveform diagram, and marking a first swing pole value based on the first waveform diagram to obtain a first target value; then, 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 a step disturbance on the terminal voltage of the generator to be measured based on the second inertia time constant and the first preset threshold, amplifying and recording the synthetic mechanical power integral of the power system stabilizer with the first preset coefficient. A second waveform diagram is obtained by amplifying and recording the waveform, and the first pendulum pole value is marked based on the second waveform diagram to obtain the second target 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, and 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 value, and the synthetic mechanical power integral of the power system stabilizer is amplified and recorded with the first preset coefficient to obtain a third waveform diagram, and the first pendulum pole value is marked based on the third waveform diagram to obtain the third target value; finally, when the absolute value of the third target value is less than or equal to the second preset threshold value, the corrected inertia time constant is determined as the target inertia time constant. The present application makes a judgment based on the mechanical synthetic power output curve of the power system stabilizer, and the inertia time constant of the generator set can be quickly calibrated through a simple step disturbance operation. This method solves the problem of large error in the inertia time constant of the unit in the prior art.

[0179] 2) The device for measuring the inertia time constant of the generator set of the present application, the first acquisition unit acquires the first inertia time constant, and based on the first inertia time constant and the first preset threshold, performs a step disturbance on the terminal voltage of the generator to be measured, amplifies and records the synthetic mechanical power integral of the power system stabilizer with a first preset coefficient, obtains a first waveform diagram, and marks the first swing pole value based on the first waveform diagram to obtain a first target value; the first calculation unit updates the first inertia time constant according to the preset adjustment step and the first target value to obtain a second inertia time constant, and performs a step disturbance on the terminal voltage of the generator to be measured based on the second inertia time constant and the first preset threshold, amplifies and records the synthetic mechanical power integral of the power system stabilizer with the first preset coefficient. The second waveform is recorded and the first swing pole value is marked based on the second waveform to obtain the second target value; 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, and the terminal voltage of the generator to be tested is subjected to a step disturbance based on the corrected inertia time constant and the first preset threshold value, and the synthetic mechanical power integral of the power system stabilizer is amplified and recorded with the first preset coefficient to obtain a third waveform, and the first swing pole value is marked based on the third waveform to obtain the third target value; 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 present application makes a judgment based on the mechanical synthetic power output curve of the power system stabilizer, and can quickly calibrate the inertia time constant of the generator set through a simple step disturbance operation. The device solves the problem of large error in the inertia time constant of the generator set in the prior art.

[0180] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for determining the inertia time constant of a generator set, characterized in that: include: Obtaining a first inertia time constant, and performing a step disturbance on the terminal voltage of the generator to be tested based on the first inertia time constant and a first preset threshold, amplifying the synthetic mechanical power integral of the power system stabilizer with a first preset coefficient and recording the waveform to obtain a first waveform diagram, and marking a first pendulum pole value based on the first waveform diagram to obtain a first target value; 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 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 value, and the synthetic mechanical power integral of the power system stabilizer is amplified and recorded with the first preset coefficient to obtain a second waveform diagram, and the first pendulum pole value is marked based on the second waveform diagram to obtain a second target value; 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 value, the synthetic mechanical power integral of the power system stabilizer is amplified and recorded with the first preset coefficient to obtain a third waveform diagram, and a first pendulum pole value is marked based on the third waveform diagram to obtain a third target value; When the absolute value of the third target value is less than or equal to the second preset threshold, the corrected inertia time constant is determined as the target inertia time constant.

2. The method according to claim 1, characterized in that Based on the first inertia time constant and the first preset threshold, a step disturbance is performed on the terminal voltage of the generator to be tested, and the synthetic mechanical power integral of the power system stabilizer is amplified and recorded with a first preset coefficient to obtain a first waveform diagram, including: Substituting the first inertia time constant into a first preset formula, calculating a power gain coefficient of the power system stabilizer, and obtaining a first gain coefficient; Based on the first gain coefficient, the terminal voltage of the generator to be tested is subjected to a step disturbance at the first preset threshold value, and the synthetic mechanical power integral of the power system stabilizer is amplified and recorded at the first preset coefficient to obtain the first waveform diagram.

3. The method according to claim 1, characterized in that 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 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 value, and the synthetic mechanical power integral of the power system stabilizer is amplified and recorded with a first preset coefficient to obtain a second waveform diagram, including: When the first target value is less than 0, calculating the sum of the first inertia time constant and the preset adjustment step length to obtain the second inertia time constant; When the first target value is greater than 0, calculating the difference between the first inertia time constant and the preset adjustment step length to obtain the second inertia time constant; Substituting the second inertia time constant into the first preset formula, calculating the power gain coefficient of the power system stabilizer, and obtaining a second gain coefficient; Based on the second gain coefficient, the terminal voltage of the generator to be tested is subjected to a step disturbance at the first preset threshold value, and the synthetic mechanical power integral of the power system stabilizer is amplified and recorded at the first preset coefficient to obtain the second waveform diagram.

4. The method according to claim 1, characterized in that: The method of 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 includes: When the first target value is less than 0, the preset adjustment step is determined as the target adjustment step; when the first target value is greater than 0, the preset adjustment step is negated to obtain the target adjustment step; The second inertia time constant, the target adjustment step, the first target value, and the second target value are substituted into a second preset formula to obtain the modified inertia time constant.

5. The method according to claim 4, characterized in that , the second preset formula is Among them, T j ` is the modified 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 size.

6. The method according to claim 1, characterized in that Based on the modified inertia time constant, the first waveform and the first preset threshold, a step disturbance is performed on the terminal voltage of the generator to be tested, and the synthetic mechanical power integral of the power system stabilizer is amplified and recorded with a first preset coefficient to obtain a third waveform, including: Substituting the modified inertia time constant into a first preset formula to calculate a power gain coefficient of the power system stabilizer to obtain a third gain coefficient; Based on the third gain coefficient and the first waveform diagram, the terminal voltage of the generator to be tested is subjected to a step disturbance at the first preset threshold value, and the synthetic mechanical power integral of the power system stabilizer is amplified and recorded at the first preset coefficient to obtain the third waveform diagram.

7. The method according to claim 1, characterized in that After determining the first pendulum pole value based on the third waveform diagram to obtain the third target value, the method further includes: a first updating step, in which, when the absolute value of the third target value is greater than the second preset threshold, the first inertia time constant is updated based on the second inertia time constant, and the second inertia time constant is updated based on the corrected inertia time constant; a second updating step of updating the corresponding first target value based on the updated first inertia time constant, and updating the corresponding second target value based on the updated second inertia time constant; A third updating step, updating and correcting the updated 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; a calculation step of updating the third target value based on the updated modified inertia time constant; The first updating step, the second updating step, the third updating step and the calculating step are sequentially repeated at least once until the absolute value of the updated third target value is less than or equal to the second preset threshold value, and the latest corrected inertia time constant is determined as the target inertia time constant.

8. A device for measuring the inertia time constant of a generator set, characterized in that: The device comprises: a first acquisition unit, configured to acquire a first inertia time constant, and based on the first inertia time constant and a first preset threshold, perform a step disturbance on the terminal voltage of the generator to be tested, amplify the synthetic mechanical power integral of the power system stabilizer with a first preset coefficient and record the waveform to obtain a first waveform diagram, and identify a first pendulum pole value based on the first waveform diagram to obtain a first target value; a first calculation unit, 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, and to perform a step disturbance on the terminal voltage of the generator to be tested based on the second inertia time constant and the first preset threshold, to amplify and record the synthetic mechanical power integral of the power system stabilizer with the first preset coefficient to obtain a second waveform diagram, and to identify a first pendulum pole value based on the second waveform diagram to obtain a second target value; a second calculation unit, 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, perform a step disturbance on the terminal voltage of the generator to be tested based on the corrected inertia time constant and the first preset threshold, amplify the synthetic mechanical power integral of the power system stabilizer with the first preset coefficient and record the waveform to obtain a third waveform diagram, and identify the first pendulum pole value based on the third waveform diagram to obtain a third target value; The first determining unit is configured to determine the modified inertia time constant as a target inertia time constant when the absolute value of the third target value is less than or equal to a second preset threshold.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium includes a stored program, wherein when the program is executed, the device where the computer-readable storage medium is located is controlled to execute the method according to any one of claims 1 to 7.

10. 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 are configured to be executed by the one or more processors, and the one or more programs include methods for executing any one of claims 1 to 7.

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