A method and device for determining damping characteristics of a generator excitation system

Abstract

The present invention proposes a method and device for determining the damping characteristics of a generator excitation system, relating to the field of electrical engineering technology. The method comprises: determining the oscillation frequency of an oscillating unit based on synchronized phasor measurement data of the oscillating unit; determining the excitation voltage phase of the excitation system based on the synchronized phasor measurement data, and determining the hysteresis characteristics of the excitation system based on the oscillation frequency; determining the damping torque phase of the excitation system based on the excitation voltage phase and the hysteresis characteristics of the excitation system, and determining the damping characteristics of the generator excitation system based on the damping torque phase. The method and device for determining the damping characteristics of a generator excitation system proposed in the present invention can quickly locate a fault and determine the cause of oscillation, significantly shortening accident analysis time.

Description

Technical Field

[0001] The present invention relates to the field of electrical engineering technology, and in particular to a method and device for determining the damping characteristics of a generator excitation system. Background Art

[0002] With the continuous development of renewable energy, how to more fully enhance the grid's ability to absorb it is a key research goal in electrical engineering. Once renewable energy is integrated into the grid, the role of traditional thermal power units will shift from supporting power sources to regulating power sources, taking on more peak-shaving responsibilities. Thermal power units operating in deep peak-shaving conditions often operate at less than 50% active power output, with some units even maintaining below 30%. Ensuring safe and stable operation under these conditions poses significant challenges for professionals in thermal engineering, electrical engineering, and other related fields. Recently, some power plants have experienced low-frequency oscillations in thermal power units during deep peak-shaving operations. Due to incomplete and low-quality accident data collection and a lack of effective technical analysis methods, it has been extremely difficult for technicians to pinpoint the cause of the fault, posing a risk to power production safety.

[0003] The Power System Stabilizer (PSS) is an additional excitation control system primarily used to suppress low-frequency oscillations in the system. However, under deep peak-shaving conditions, the operating environment of the unit excitation system and PSS will undergo significant changes. Whether the PSS can output normally under these special conditions is key to ensuring the safe operation of the power grid during deep peak-shaving. The Wide Area Synchronized Measurement System (WAMS), established based on the low latency and high upload frequency characteristics of the synchronized phasor measurement unit (PMU), is one of the important tools for dynamically monitoring the status of the power system. The data it collects is also the primary basis for analysis after low-frequency oscillations occur. When a low-frequency oscillation incident occurs in the system, the conventional analysis method is for technicians to perform manual accident analysis using WAMS measurement data. However, this method consumes a large amount of manpower and material resources and is time-consuming, which is not conducive to the rapid troubleshooting and resumption of production of the power plant.

[0004] In view of this, the inventor, based on many years of production design experience in this field and related fields, has designed a method and device for determining the damping characteristics of a generator excitation system after repeated experiments, in order to solve the problems existing in the prior art. Summary of the Invention

[0005] The object of the present invention is to provide a method and device for determining the damping characteristics of a generator excitation system, which can quickly locate the fault position and determine the cause of oscillation, significantly shortening the accident analysis time.

[0006] To achieve the above object, the present invention proposes a method for determining the damping characteristics of a generator excitation system, wherein the determination method comprises:

[0007] determining an oscillation frequency of the oscillating unit based on synchronized phasor measurement data of the oscillating unit;

[0008] determining an excitation voltage phase of an excitation system based on the synchronized phasor measurement data, and determining a hysteresis characteristic of the excitation system based on the oscillation frequency;

[0009] The damping torque phase of the excitation system is determined according to the excitation voltage phase and the hysteresis characteristic of the excitation system, and the damping characteristic of the generator excitation system is determined according to the damping torque phase.

[0010] The present invention further provides a device for determining the excitation damping characteristics of a generator, wherein the device comprises:

[0011] an oscillation frequency calculation module, which determines and calculates the oscillation frequency of the oscillation unit based on the synchronized phasor measurement data of the oscillation unit;

[0012] an excitation voltage phase calculation module, for determining an excitation voltage phase of an excitation system based on the synchronized phasor measurement data;

[0013] an excitation system hysteresis characteristic calculation module, which determines the hysteresis characteristic of the excitation system based on the oscillation frequency;

[0014] The damping torque phase analysis module determines the damping torque phase of the excitation system according to the excitation voltage phase and the hysteresis characteristic of the excitation system, and determines the damping characteristic of the generator excitation system according to the damping torque phase of the excitation system.

[0015] The present invention further provides a computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the above-mentioned method when executing the computer program.

[0016] The present invention further provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method as claimed in the preceding claims is implemented.

[0017] Compared with the prior art, the present invention has the following characteristics and advantages:

[0018] The determination method and device proposed in the present invention can automatically analyze and determine the damping characteristics of the excitation system in low-frequency oscillation based on the data of the wide-area synchronous measurement system (WAMS), providing an important basis for fault location.

[0019] The determination method and device proposed in the present invention can not only reduce the impact of low data quality on damping characteristic analysis, greatly saving manpower and material resources invested in accident analysis, but also significantly shorten the accident analysis time, help to quickly determine the cause of oscillation, and are of great significance for quickly restoring power production and improving the safety and reliability of the power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings described herein are for illustrative purposes only and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the various components in the drawings are merely illustrative and are used to help understand the present invention, and are not intended to specifically limit the shapes and proportional dimensions of the various components of the present invention. Those skilled in the art can select various possible shapes and proportional dimensions to implement the present invention according to specific circumstances under the guidance of the present invention.

[0021] Figure 1 This is a flow chart of the method for determining the damping characteristics of the generator excitation system proposed by the present invention;

[0022] Figure 2 This is a working principle diagram of the excitation system described in the present invention;

[0023] Figure 3 This is a schematic diagram of the Philip-Haifulong model in the present invention;

[0024] Figure 4A The electromagnetic torque ΔT provided by the generator excitation system of the present invention e2 Provide a schematic diagram of the positive damping torque;

[0025] Figure 4B The electromagnetic torque ΔT provided by the generator excitation system of the present invention e2 Provide a schematic diagram of negative damping torque;

[0026] Figure 5 is the damping torque ΔΤ of the excitation system in the present invention PSS Schematic diagram in the Δω-Δδ coordinate system;

[0027] Figure 6 The PMU data of the unit oscillation process in one embodiment of the present invention;

[0028] Figure 7 is the damping torque ΔΤ of the excitation system in the Δω-Δδ coordinate system in one embodiment of the present invention PSS Spatial phase diagram DETAILED DESCRIPTION

[0029] The details of the present invention can be more clearly understood by referring to the accompanying drawings and the description of the specific embodiments of the present invention. However, the specific embodiments of the present invention described herein are only for the purpose of explaining the present invention and are not to be construed as limiting the present invention in any way. Based on the teachings of the present invention, a skilled person can conceive of any possible variations based on the present invention, and such variations should be considered to fall within the scope of the present invention.

[0030] like Figures 1 to 5 As shown, the present invention proposes a method for determining the damping characteristics of a generator excitation system, the determination method comprising:

[0031] Determining an oscillation frequency of the oscillating unit (faulty unit) based on synchronized phasor measurement data (PMU data);

[0032] determining an excitation voltage phase of an excitation system based on the synchronized phasor measurement data (PMU data), and determining a hysteresis characteristic of the excitation system based on the oscillation frequency;

[0033] The damping torque phase of the excitation system (PSS) is determined according to the excitation voltage phase and the hysteresis characteristic of the excitation system, and the damping characteristic of the generator excitation system is determined according to the damping torque phase of the excitation system.

[0034] The determination method proposed in the present invention can automatically analyze and judge the damping characteristics of the excitation system in low-frequency oscillation based on the data of the wide-area synchronous measurement system (WAMS), providing an important basis for fault location.

[0035] The determination method proposed in the present invention can not only reduce the impact of low data quality on damping characteristic analysis, greatly saving manpower and material resources invested in accident analysis, but also significantly shorten the accident analysis time, help to quickly determine the cause of oscillation, and is of great significance for quickly restoring power production and improving the safety and reliability of the power system.

[0036] In an optional embodiment of the present invention, the synchronized phasor measurement data (PMU data) includes at least the excitation voltage, active power and rotation speed of the oscillating machine group.

[0037] In an optional embodiment of the present invention, after the synchronized phasor measurement data (PMU data) is collected, the synchronized phasor measurement data (PMU data) is first cleaned, and then the cleaned data is used for subsequent calculations and analysis.

[0038] In an optional example of this embodiment, the synchronized phasor measurement data (PMU data) D(Δt) from time t1 to t2 (where t1 is the initial time of the data interception and t2 is the end time of the data interception) is taken as the analysis object (t2-t1=Δt), and Fourier analysis is performed on it. Only the fundamental component data D1(Δt) is retained, and other harmonic components are eliminated.

[0039] In an optional example of this embodiment, the specific calculation process of calculating the oscillation frequency of the oscillating unit using synchronized phasor measurement data (PMU data) is as follows:

[0040] Record the excitation voltage U f (Δt), active power P e The zero crossing moments in (Δt) and speed ω(Δt) are t' Uf_1 ~t' Uf_n 、t' Pe_1 ~t' Pe_n and t' ω_1 ~t' ω_n (n=1.2.3……), the average value of the oscillation period T=2(t' Pe_n -t' Pe_1 ) / (n-1), and finally the oscillation frequency f0=1 / T is obtained.

[0041] In an optional embodiment of the present invention, the synchronized phasor measurement data includes the active power of the oscillating unit; wherein, determining the excitation voltage phase of the excitation system based on the synchronized phasor measurement data includes: determining the voltage phase of the excitation system according to the active power.

[0042] Specifically, according to the active power, the phase of the excitation system is determined, including: using the electric power deviation ΔP in the PMU data e As a benchmark, determine the PSS output signal U PSS In the Δδ-Δω coordinate system, the spatial phase (excitation voltage U f With PSS output signal U PSS The phase is approximately the same in the Δω-Δδ coordinate system), that is, ΔP e As the starting point of phase 0 of the Δδ-Δω coordinate system, calculate the excitation voltage U f Relative to ΔP e Phase (leading is positive, lagging is negative), as shown in formula (1):

[0043]

[0044] In an optional embodiment of the present invention, the synchronized phasor measurement data includes the rotational speed of the oscillating unit; wherein, determining the excitation voltage phase of the excitation system based on the synchronized phasor measurement data includes: determining the voltage phase of the excitation system according to the rotational speed.

[0045] Specifically, according to the speed, the phase of the excitation system is determined, including: taking the speed Δω in the PMU data as a reference, determining the PSS output signal U PSS In the Δδ-Δω coordinate system, the spatial phase (excitation voltage U f With PSS output signal U PSS The phases are approximately the same in the Δω-Δδ coordinate system), that is, Δω is the starting point of the phase 0 of the Δδ-Δω coordinate system, and the excitation voltage U is calculated. f Relative to Δω phase (Leading is positive, lagging is negative) as shown in formula (2):

[0046]

[0047] In the present invention, the excitation voltage phase may also be obtained by other methods well known to those skilled in the art, which will not be described in detail here.

[0048] In an optional embodiment of the present invention, the hysteresis characteristics of the excitation system are determined based on the oscillation frequency, including: obtaining a phase-frequency function through data fitting according to the phase of the damping torque of the excitation system relative to its output signal, and determining the hysteresis characteristics of the excitation system from the phase-frequency function at the vibration frequency.

[0049] In an optional example of this embodiment, the free compensation characteristics of the excitation system can be directly obtained by fitting based on field test results.

[0050] In another optional example of this embodiment, the free compensation characteristics of the excitation system can be obtained based on theoretical calculations.

[0051] In this embodiment, since the oscillating unit excitation system has no compensation characteristics, its value is equal to the excitation system (PSS) damping torque ΔΤ PSS Relative to the excitation system (PSS) output signal U PSS The phase (advance is positive, lag is negative) can be used to obtain the phase-frequency function by fitting the data. Calculate the phase of the uncompensated characteristic of the excitation system under the current f0

[0052] In an optional embodiment of the present invention, the damping torque phase of the excitation system is determined based on the excitation voltage phase and the hysteresis characteristics of the excitation system, including: summing the excitation voltage phase and the phase without compensation characteristics. That is, summing the excitation voltage phase and the phase without compensation characteristics of the excitation system corresponding to the current f0. The phase of the damping torque of the excitation system (PSS) in the generator speed and power angle (Δω-Δδ) coordinate system can be obtained by adding

[0053] In an optional example of this embodiment, the active power P e (Δt) Calculate the excitation voltage phase, then That is, ΔΤ PSS Relative to ΔP e The phase of the CMOS (leading is positive, lagging is negative).

[0054] In another optional example of this embodiment, the excitation voltage phase is calculated by the speed ω(Δt), then That is, ΔΤ PSS The phase relative to Δω (leading is positive, lagging is negative).

[0055] In an optional embodiment of the present invention, if the damping torque phase of the excitation system (PSS) is in the first quadrant and the second quadrant in the Δω-Δδ coordinate system, it is considered that the PSS provides a positive damping torque, and ΔΤ PSS The larger the projection in the positive direction of the Δω axis, the greater the positive damping torque provided by the PSS;

[0056] If the PSS damping torque phase is in the third and fourth quadrants in the Δω-Δδ coordinate system, it is considered that the PSS provides a negative damping torque, and ΔΤ PSS The larger the projection in the negative direction of the Δω axis, the greater the negative damping torque provided by the PSS.

[0057] In the present invention, the basic principle of PSS (power system stabilizer) is to convert the generator speed deviation Δω, frequency deviation Δf, and electric power deviation ΔP e One or more signals in the ΔP are used as the input of the excitation system control, and after the phase correction link, a positive damping torque is generated to achieve the purpose of suppressing the low-frequency oscillation of the system. e and Δω are input signals, and after the phase compensation link, the output signal U is generated. PSS Acting on AVR, it will generate additional torque ΔT pss ; After determining the appropriate PSS gain and phase compensation, ΔT pss and ΔT e2 (ΔT e2 The projection of the resultant torque on the Δω axis is positive. The excitation system will provide positive damping. The basic principle of its action is as follows: Figure 2 shown.

[0058] PSS uses the existing Philips-Heffron single-machine infinite system model. Figure 3 As shown, where ΔT M is the mechanical torque, ΔT e1 and ΔT e2 are electromagnetic torques, Δω and Δδ are the changes in generator speed and power angle respectively; ΔU PSS is the PSS output change; ΔU REF is the change in the terminal voltage reference value; ΔE fd is the excitation voltage change; ΔE q ' is the transient potential change of the generator, T j is the unit's moment of inertia, ω0 is the generator's rated speed, T d0 ' is the generator time constant, and D is the mechanical damping.

[0059] When the disturbance on the system side or the prime mover side causes power oscillation, the generator terminal voltage induces the system disturbance and generates a change ΔU t ; PSS collects the active power and speed signals of the generator to generate the PSS output signal ΔU PSS , and ΔU t and ΔU REF The excitation voltage variation ΔE is generated by the excitation regulator (AVR) fd , and then with the transfer function K3(1+K3T d0 's) to generate ΔE q ', and finally the electromagnetic torque ΔT is generated through the action of gain K2 e2 , ΔT e2 The phase characteristics of the excitation system determine whether it can suppress or aggravate power oscillations.

[0060]

[0061] In the Δδ-Δω coordinate system, as shown in FIG4A and FIG4B, when ΔT e2 Project ΔT on the Δω axis e2 When ' is positive, the excitation system provides positive damping, that is, it suppresses low-frequency oscillations; ΔT e2 Project ΔT on the Δω axis e2 When ' is negative, the excitation system provides negative damping, which intensifies the low-frequency oscillation. By analyzing the electromagnetic torque ΔT e2 The spatial phase in the Δδ-Δω coordinate system can be used to determine the damping characteristics of the excitation system.

[0062] The present invention further provides a device for determining the damping characteristics of a generator excitation system, the device comprising:

[0063] An oscillation frequency calculation module, which determines and calculates the oscillation frequency of the oscillation unit based on the synchronous phasor measurement data of the oscillation unit of the generator;

[0064] An excitation voltage phase calculation module determines the excitation voltage phase of the excitation system based on synchronized phasor measurement data;

[0065] a magnetic system hysteresis characteristic calculation module, which determines the hysteresis characteristic of the excitation system based on the vibration frequency;

[0066] The damping torque phase analysis module determines the damping torque phase of the excitation system according to the excitation voltage phase and the hysteresis characteristics of the excitation system, and determines the damping characteristics of the generator excitation system according to the damping torque phase of the excitation system.

[0067] The present invention also provides a computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the above-mentioned determination method when executing the computer program.

[0068] In an optional embodiment of the present invention, the computer device (analyzing device) makes a determination according to the following process:

[0069] (1) Data import: The PMU data of the excitation voltage, active power and speed of the oscillating unit (faulty unit) are exported and read into the computer equipment (analysis device).

[0070] (2) Data cleaning. The PMU data D(Δt) from time t1 to t2 (t1 is the start of data collection, t2 is the end of data collection) is selected as the analysis object (t2-t1=Δt). Fourier analysis is performed on it, and only the fundamental component data D1(Δt) is retained, while other harmonic components are eliminated.

[0071] (3) Calculate the oscillation frequency f0. f (Δt), P e The zero-crossing moments in (Δt) and ω(Δt) are t' Uf_1 ~t' Uf_n 、t' Pe_1 ~t' Pe_n and t' ω_1 ~t' ω_n (n=1.2.3……), the average value of the oscillation period T=2(t' Pe_n -t' Pe_1 ) / (n-1), and then the oscillation frequency f0=1 / T is obtained.

[0072] (4) Determine the excitation voltage U f Phase.

[0073] Method 1: Using ΔP in PMU datae As a benchmark, determine U PSS The spatial phase in the Δδ-Δω coordinate system, ΔP e As the starting point of phase 0 in the Δδ-Δω coordinate system, calculate U f Relative to ΔP e Phase (leading is positive, lagging is negative), as shown in formula (1):

[0074]

[0075] Method 2: Determine U based on Δω in PMU data PSS The spatial phase in the Δδ-Δω coordinate system, that is, Δω is the starting point of the Δδ-Δω coordinate system phase 0, calculate U f Relative to Δω phase (Leading is positive, lagging is negative) as shown in formula (2):

[0076]

[0077] Among them, the excitation voltage U f With PSS output signal U PSS The phases are approximately the same in the Δω-Δδ coordinate system.

[0078] (5) Calculation of the hysteresis characteristics of the excitation system. The uncompensated characteristics of the excitation system of the oscillating unit are obtained through field measurement or theoretical calculation, and their numerical value is equal to the PSS damping torque ΔΤ PSS Relative to the PSS output signal U PSS The phase (advance is positive, lag is negative), and then the phase-frequency function is obtained by data fitting Calculate the phase of the uncompensated characteristic of the excitation system under the current f0

[0079] (6) Determine the PSS damping torque ΔΤ PSS Phase. Adding the results of (4) and (5) gives the phase of the PSS damping torque in the Δω-Δδ coordinate system: If we use method 1 in (4) to calculate, then That is, ΔΤ PSS Relative to ΔP e Phase (leading is positive, lagging is negative); if the calculation method 2 in (4) is used, then That is, ΔΤ PSS The phase relative to Δω (leading is positive, lagging is negative).

[0080] (7) Analysis of PSS damping characteristics. If the vector ΔΤ PSS In the first and second quadrants of the Δω-Δδ coordinate system, the PSS is considered to provide a positive damping torque, and ΔΤ PSSThe larger the projection on the positive direction of the Δω axis, the greater the positive damping torque provided by the PSS; if the vector ΔΤ PSS In the third and fourth quadrants of the Δω-Δδ coordinate system, the PSS is considered to provide a negative damping torque, and ΔΤ PSS The larger the projection in the negative direction of the Δω axis, the greater the negative damping torque provided by the PSS.

[0081] The present invention also provides a computer-readable storage medium storing a computer program, wherein the computer program implements the method according to any one of claims 1 to 8 when executed by a processor.

[0082] The specific implementation process of the method and device for determining the damping characteristics of the generator excitation system proposed by the present invention is now described in detail in conjunction with an embodiment to demonstrate the effectiveness of the method and device for determining the damping characteristics of the generator excitation system:

[0083] In a power plant, Unit 4 experienced a low-frequency oscillation during deep peak regulation and phase-leading operation. During the oscillation, the PSS was exited and the power oscillation subsided. The technicians initially determined that this low-frequency oscillation event was related to abnormal output of the excitation system (PSS). f The damping characteristics of PSS are analyzed.

[0084] Step 1: The PMU data of Unit 4 (such as Figure 6 The data is imported into the analysis device, the data is cleaned, and the active oscillation frequency f0 = 1.80 Hz is calculated.

[0085] Step 2: Select method 2 to calculate U f Phase. Taking unit #4 Δω as the benchmark, calculate U f The phase relative to Δω is Since the excitation voltage U f With PSS output signal U PSS The phases are approximately the same in the Δω-Δδ coordinate system, so the PSS output signal U PSS In phase with the Δω axis.

[0086] Step 3: The uncompensated characteristics of the excitation system of Unit 4 are measured through field tests, as shown in Table 1. The phase-frequency function is obtained by data fitting. Calculate the phase of the excitation system without compensation characteristics corresponding to f0 = 1.80Hz That is, when f0=1.80Hz, the PSS damping torque ΔΤ PSS Phase lag PSS output signal U PSS It is 111.8°.

[0087] Table 1 Uncompensated characteristics of the excitation system of Unit 4

[0088] f(Hz) 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 Φ(°) -70.6 -103.1 -100.6 -101.6 -97.7 -92.5 -91.7 -92.7 -88.7 -90.3 f(Hz) 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2 Φ(°) -93.9 -101.3 -106.5 -106.5 -108.0 -116.4 -117.1 -111.8 -108.2 -103.8

[0089] Step 4: Add the results of Step 2 and Step 3 to get the phase of the PSS damping torque of Unit 4 relative to Δω That is, ΔΤ PSS The lag Δω is 111.8°, which is located in the IV quadrant in the Δω-Δδ coordinate system, as shown in Figure 7 As shown, it can be judged that the PSS of unit #4 provides negative damping during the active power oscillation process.

[0090] In step 5, because the PSS provided negative damping during the active power oscillation, it was inferred that the PSS output was abnormal during this process, and troubleshooting was performed on the excitation system. Later investigation revealed that improper parameter settings in the PSS excitation system caused the abnormal PSS output, which in turn caused the power oscillation.

[0091] The method and device for determining the damping characteristics of the generator excitation system proposed in the present invention are based on the Philips-Heffron single-machine infinite system mathematical model. The PMU data of the unit with low-frequency oscillation accident is imported into the excitation system damping characteristics determination device. After data cleaning, the electromagnetic torque ΔT generated by the PSS is analyzed in the Δδ-Δω coordinate system. PSS The spatial phase of the excitation system can be used to determine the damping characteristics of the excitation system to assist in the analysis of the cause of the low-frequency oscillation event.

[0092] The detailed explanations of the above-mentioned embodiments are intended only to explain the present invention so as to facilitate a better understanding of the present invention. However, these descriptions cannot be interpreted as limiting the present invention for any reason. In particular, the various features described in different embodiments may also be arbitrarily combined with each other to form other embodiments. Unless otherwise clearly described, these features should be understood to be applicable to any embodiment and are not limited to the described embodiments.

Claims

1. A method for determining the damping characteristics of a generator excitation system, characterized in that: The determination method includes: determining an oscillation frequency of the oscillating unit based on synchronized phasor measurement data of the oscillating unit; determining an excitation voltage phase of an excitation system based on the synchronized phasor measurement data, and determining a hysteresis characteristic of the excitation system based on the oscillation frequency; determining a damping torque phase of the excitation system according to the excitation voltage phase and a hysteresis characteristic of the excitation system, and determining a damping characteristic of the generator excitation system according to the damping torque phase; The synchronized phasor measurement data includes the active power and excitation voltage of the oscillating unit; wherein, determining the excitation voltage phase of the excitation system based on the synchronized phasor measurement data includes: determining the voltage phase of the excitation system according to the active power; Determining the phase of the excitation system according to the active power includes: calculating the spatial phase of the excitation voltage in the rotational speed and power angle coordinate system of the generator based on the active power, and then, （1）； in, is the active power The time corresponding to the zero crossing point; is the excitation voltage The time corresponding to the zero crossing point; is the spatial phase; T is the average value of the oscillation period of the oscillating unit; n is the number of cycles of the oscillating unit; Determining the hysteresis characteristic of the excitation system based on the oscillation frequency includes: obtaining a phase-frequency function through data fitting according to the phase of the damping torque of the excitation system relative to its output signal, and determining the hysteresis characteristic of the excitation system according to the phase-frequency function at the oscillation frequency; Determining the damping torque phase of the excitation system according to the excitation voltage phase and the hysteresis characteristic of the excitation system includes: summing the excitation voltage phase and the phase without compensation characteristic.

2. A method for determining the damping characteristics of a generator excitation system, characterized in that: The determination method includes: determining an oscillation frequency of the oscillating unit based on synchronized phasor measurement data of the oscillating unit; determining an excitation voltage phase of an excitation system based on the synchronized phasor measurement data, and determining a hysteresis characteristic of the excitation system based on the oscillation frequency; determining a damping torque phase of the excitation system according to the excitation voltage phase and a hysteresis characteristic of the excitation system, and determining a damping characteristic of the generator excitation system according to the damping torque phase; The synchronized phasor measurement data includes the speed and excitation voltage of the oscillating unit; wherein, determining the excitation voltage phase of the excitation system based on the synchronized phasor measurement data includes: determining the voltage phase of the excitation system according to the speed; Determining the phase of the excitation system according to the rotational speed includes: calculating the spatial phase of the excitation voltage in the rotational speed and power angle coordinate system of the generator based on the rotational speed, and then: （2）； in, is the time corresponding to the zero-crossing point of the speed; The excitation voltage The time corresponding to the zero crossing point; is the spatial phase; T is the average value of the oscillation period of the oscillating unit; n is the number of cycles of the oscillating unit; Determining the hysteresis characteristic of the excitation system based on the oscillation frequency includes: obtaining a phase-frequency function through data fitting according to the phase of the damping torque of the excitation system relative to its output signal, and determining the hysteresis characteristic of the excitation system according to the phase-frequency function at the oscillation frequency; Determining the damping torque phase of the excitation system according to the excitation voltage phase and the hysteresis characteristic of the excitation system includes: summing the excitation voltage phase and the phase without compensation characteristic.

3. The method for determining the damping characteristics of a generator excitation system according to claim 1 or 2, wherein: Determining the damping characteristics of the generator excitation system according to the damping torque phase includes: If the damping torque phase of the excitation system falls into the first quadrant and the second quadrant of the speed and power angle coordinate system of the generator, then the damping torque phase is a positive damping torque; If the damping torque phase of the excitation system falls into the third quadrant or the fourth quadrant in the rotational speed and power angle coordinate system of the generator, the damping torque phase is a negative damping torque.

4. The method for determining the damping characteristics of a generator excitation system according to claim 1 or 2, wherein: Determining the oscillation frequency of the oscillating machine group based on the synchronized phasor measurement data of the oscillating machine group includes: intercepting the synchronized phasor measurement data from the first moment to the second moment, performing Fourier processing on the data to obtain fundamental component data, and determining the oscillation frequency of the oscillating machine group through the fundamental component data.

5. A device for determining the damping characteristics of a generator excitation system, using the method for determining the damping characteristics of a generator excitation system according to claim 1 or 2, characterized in that: The device comprises: an oscillation frequency calculation module, which determines and calculates the oscillation frequency of the oscillation unit based on the synchronized phasor measurement data of the oscillation unit; an excitation voltage phase calculation module, for determining an excitation voltage phase of an excitation system based on the synchronized phasor measurement data; a magnetic system hysteresis characteristic calculation module, which determines the hysteresis characteristic of the excitation system based on the oscillation frequency; The damping torque phase analysis module determines the damping torque phase of the excitation system according to the excitation voltage phase and the hysteresis characteristic of the excitation system, and determines the damping characteristic of the generator excitation system according to the damping torque phase of the excitation system.

6. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the method according to claim 1 or 2 is implemented.

7. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method according to claim 1 or 2 is implemented.

Images