Generator excitation difference adjustment coefficient test method, device, equipment and program product

Abstract

The invention relates to a generator excitation difference adjustment coefficient test method, device, equipment and program product, and the method comprises the steps: obtaining the terminal voltage and reactive power of a test generator at a first reactive power, and the terminal voltage and reactive power of the test generator at a second reactive power, and keeping the voltage given value and active power of the test generator unchanged; and according to the generator terminal voltage and the reactive power at the first reactive power and the generator terminal voltage and the reactive power at the second reactive power, utilizing an excitation difference adjustment coefficient calculation formula to calculate an excitation difference adjustment coefficient of the test generator, if the excitation difference adjustment coefficient is consistent with a preset excitation difference adjustment coefficient, judging that the difference adjustment coefficient of the excitation regulator meets a use condition, and if the difference adjustment coefficient is consistent with the preset excitation difference adjustment coefficient, judging that the excitation regulator meets the use condition. Otherwise, judging that the difference adjustment coefficient of the excitation regulator does not meet the use condition. Therefore, the problem that test data have errors due to the fact that a large-scale generator cannot keep a zero-power working condition is solved, only the active power of a unit needs to be kept stable in the test process, the test data are accurate, and safe operation of the generator in the test process is guaranteed.

Description

Technical Field

[0001] The present application relates to the field of electric power technology, and in particular to a method, device, equipment and program product for testing a generator excitation modulation coefficient. Background Art

[0002] In large power plants, generators and transformers often operate within the same booster station, forming a complex power system. Within this system, the excitation current of each generator not only directly determines its own reactive current output but also influences the reactive currents of other generators operating in parallel, thus significantly impacting the voltage stability of the entire power grid. To ensure the proper distribution of reactive power, modern excitation regulators incorporate an additional excitation differential function. This function ensures that reactive power distribution between generators remains within a reasonable and stable range during dynamic changes in the power system, thereby improving the operational stability and reliability of the entire power system. However, to ensure the effective function of this excitation regulator function, accurate testing of the excitation differential coefficient is essential.

[0003] Relevant standards in the power industry, such as the "Technical Requirements for Synchronous Generator Excitation Systems" (DL / T 843-2021), clearly define the testing methods for the excitation differential coefficient. The "reactive load shedding method" and the "extrapolation method" are two commonly used testing methods. However, both methods require the generator to be operating at zero power factor during testing.

[0004] However, in practice, modern large steam turbine units often require a certain initial active power level after grid connection to ensure stable operation. Therefore, maintaining zero power factor during grid-connected operation is extremely difficult. In actual testing, generators often cannot operate at zero power and must operate at a certain low power level. This not only leads to errors in test data, affecting the accuracy of excitation modulation coefficient testing, but also makes generator operation unstable under zero or low power conditions, increasing operational safety risks. Therefore, improving the accuracy and reliability of excitation modulation coefficient measurement while ensuring safety has become a pressing issue. Summary of the Invention

[0005] The present application provides a generator excitation modulation coefficient testing method, device, equipment and program product to solve the problem that large generators cannot maintain zero power factor working conditions, which leads to certain errors in test data.

[0006] The first aspect of the present application provides a method for testing the excitation adjustment coefficient of a generator, comprising the following steps: obtaining the terminal voltage and reactive power of the test generator at a first reactive power, and the terminal voltage and reactive power of the test generator at a second reactive power, wherein the voltage setting value and active power of the test generator remain unchanged; according to the terminal voltage and reactive power of the test generator at the first reactive power, and the terminal voltage and reactive power of the test generator at the second reactive power, the excitation adjustment coefficient of the test generator is calculated using an excitation adjustment coefficient calculation formula, and it is determined whether the excitation adjustment coefficient is consistent with a preset excitation adjustment coefficient; if the excitation adjustment coefficient is consistent with the preset excitation adjustment coefficient, it is determined that the current excitation regulator adjustment coefficient meets the preset usage conditions; otherwise, it is determined that the current excitation regulator adjustment coefficient does not meet the preset usage conditions.

[0007] Through the above technical solution, the test generator is indirectly adjusted by the constant voltage given reactive power adjustment method. There is no need for the active power of the test generator to be zero or low power operation. As long as the active power of the unit remains stable during the test, the test data is accurate, avoiding the limitation of the traditional method that requires the generator to be in a zero power factor condition for a long time. The generator is allowed to be tested with a certain low power, reducing the instability of the generator operating under low power or zero power conditions, thereby improving the safety and efficiency of the test. By comparing the calculated excitation differential coefficient with the preset excitation differential coefficient, it can be determined whether the current excitation regulator meets the preset usage conditions, which helps to promptly discover possible problems with the excitation regulator and ensure that its performance meets the design requirements, thereby improving the stability and safety of the power system.

[0008] Optionally, the excitation adjustment coefficient calculation formula is:

[0009]

[0010] Wherein, C is the excitation adjustment coefficient of the test generator, U G1 is the terminal voltage of the test generator at the first reactive power, U G2 is the terminal voltage of the test generator at the second reactive power, U N is the rated voltage of the test generator, Q1 is the reactive power of the test generator at the first reactive power, Q2 is the reactive power of the test generator at the second reactive power, S N is the rated capacity of the test generator.

[0011] Through the above technical solution, the excitation regulation coefficient of the test generator can be accurately calculated by obtaining the terminal voltage and reactive power data of the test generator under different reactive powers and using the excitation regulation coefficient calculation formula, thereby reducing the error introduced by changes in the operating conditions of the generator.

[0012] Optionally, after determining that the current excitation regulator adjustment coefficient meets the preset use condition, the method includes: using the current excitation regulator adjustment coefficient to adjust the voltage and reactive power of the generator.

[0013] Optionally, regulating the voltage and reactive power of the generator by using the current excitation regulator adjustment coefficient includes: regulating the voltage and reactive power of the generator by using a preset voltage adjustment formula, wherein the preset voltage adjustment formula is:

[0014]

[0015] Among them, U set is the voltage given value, U * G is the actual voltage per unit value at the machine end, Q * is the per-unit reactive power value of the generator, P * is the per-unit value of the generator active power, and C is the excitation adjustment coefficient of the test generator.

[0016] Through the above technical solution, the voltage and reactive power of the generator are adjusted using the verified excitation regulator adjustment coefficient, which can more accurately control the reactive power output by the generator, thereby optimizing the distribution of reactive power in the entire power system.

[0017] Optionally, obtaining the terminal voltage and reactive power of the test generator at a first reactive power, and the terminal voltage and reactive power of the test generator at a second reactive power, includes: controlling the test generator to operate according to the first reactive power, and obtaining the terminal voltage and reactive power of the test generator at the first reactive power; using an adjacent generator of the test generator to adjust the test generator from the first reactive power to the second reactive power, and controlling the test generator to operate according to the second reactive power, and obtaining the terminal voltage and reactive power of the test generator at the second reactive power.

[0018] Through the above technical solution, the test generator is adjusted from the first reactive power to the second reactive power by using the adjacent generator, avoiding direct large-scale reactive power adjustment of the test generator and ensuring the constancy of the test generator voltage set value.

[0019] The second aspect of the present application provides a generator excitation adjustment coefficient test device, including: an acquisition module, used to obtain the machine-end voltage and reactive power of the test generator at a first reactive power, and the machine-end voltage and reactive power of the test generator at a second reactive power, wherein the voltage set value and active power of the test generator remain unchanged; a calculation module, used to calculate the excitation adjustment coefficient of the test generator according to the machine-end voltage and reactive power of the test generator at the first reactive power, and the machine-end voltage and reactive power of the test generator at the second reactive power, using the excitation adjustment coefficient calculation formula, and determine whether the excitation adjustment coefficient is consistent with the preset excitation adjustment coefficient; a judgment module, used to determine that the current excitation regulator adjustment coefficient meets the preset usage conditions if the excitation adjustment coefficient is consistent with the preset excitation adjustment coefficient, otherwise, determine that the current excitation regulator adjustment coefficient does not meet the preset usage conditions.

[0020] Optionally, the excitation adjustment coefficient calculation formula is:

[0021]

[0022] Wherein, C is the excitation adjustment coefficient of the test generator, U G1 is the terminal voltage of the test generator at the first reactive power, U G2 is the terminal voltage of the test generator at the second reactive power, U N is the rated voltage of the test generator, Q1 is the reactive power of the test generator at the first reactive power, Q2 is the reactive power of the test generator at the second reactive power, S N is the rated capacity of the test generator.

[0023] Optionally, after determining that the current excitation regulator adjustment coefficient meets the preset usage conditions, the judgment module is further used to: use the current excitation regulator adjustment coefficient to adjust the voltage and reactive power of the generator.

[0024] Optionally, the voltage and reactive power of the generator are adjusted using the current excitation regulator adjustment coefficient, and the judgment module is further used to: adjust the voltage and reactive power of the generator using a preset voltage adjustment formula, wherein the preset voltage adjustment formula is:

[0025]

[0026] Among them, U set is the voltage given value, U * G is the actual voltage per unit value at the machine end, Q * is the per-unit reactive power value of the generator, P *is the per-unit value of the generator active power, and C is the excitation adjustment coefficient of the test generator.

[0027] Optionally, the acquisition module is also used to: control the test generator to operate according to the first reactive power, and obtain the terminal voltage and reactive power of the test generator at the first reactive power; use the adjacent generator of the test generator to adjust the test generator from the first reactive power to the second reactive power, and control the test generator to operate according to the second reactive power, and obtain the terminal voltage and reactive power of the test generator at the second reactive power.

[0028] An embodiment of the third aspect of the present application provides an electronic device, comprising: a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the processor executes the program to implement the generator excitation modulation coefficient testing method as described in the above embodiment.

[0029] A fourth aspect of the present application provides a computer program product having a computer program stored thereon, which is executed by a processor to implement the generator excitation adjustment coefficient testing method as described in the above embodiment.

[0030] In the above embodiment, the terminal voltage and reactive power of the test generator at a first reactive power and the terminal voltage and reactive power at a second reactive power are obtained, and the voltage setting value and active power of the test generator remain unchanged. The excitation adjustment coefficient of the test generator is calculated using the excitation adjustment coefficient calculation formula based on the terminal voltage and reactive power at the first reactive power and the terminal voltage and reactive power at the second reactive power. If the excitation adjustment coefficient is consistent with the preset excitation adjustment coefficient, it is determined that the excitation regulator adjustment coefficient meets the use conditions; otherwise, it is determined that the excitation regulator adjustment coefficient does not meet the use conditions. This solves the problem that large generators cannot maintain zero power factor, which leads to certain errors in the test data. The constant voltage given reactive power adjustment method does not require the generator active power to be zero or low power operation. As long as the active power of the unit remains stable during the test, the test data is accurate, ensuring the safe and stable operation of the generator during the test.

[0031] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0033] Figure 1This is a flow chart of a method for testing a generator excitation modulation coefficient according to an embodiment of the present application;

[0034] Figure 2 This is an example diagram of a generator excitation modulation coefficient testing device according to an embodiment of the present application;

[0035] Figure 3 Schematic diagram of the structure of an electronic device according to an embodiment of the present application. DETAILED DESCRIPTION

[0036] The following describes in detail embodiments of the present application. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0037] The following describes the generator excitation differential coefficient testing method, device, equipment and program product of the embodiment of the present application with reference to the accompanying drawings. In response to the problem mentioned in the above background technology that large generators cannot maintain a zero power factor working condition, which leads to certain errors in the test data, the present application provides a generator excitation differential coefficient testing method, in which the terminal voltage and reactive power of the test generator at a first reactive power and the terminal voltage and reactive power at a second reactive power are obtained, and the voltage set value and active power of the test generator remain unchanged; based on the terminal voltage and reactive power at the first reactive power and the terminal voltage and reactive power at the second reactive power, the excitation differential coefficient of the test generator is calculated using the excitation differential coefficient calculation formula. If the excitation differential coefficient is consistent with the preset excitation differential coefficient, it is determined that the excitation regulator differential coefficient meets the use conditions; otherwise, it is determined that the excitation regulator differential coefficient does not meet the use conditions. This solves the problem that large generators cannot maintain zero power factor, which leads to certain errors in test data. The constant voltage given reactive power adjustment method does not require the generator active power to be zero or operate at low power. As long as the active power of the unit remains stable during the test, the test data is accurate, ensuring the safe and stable operation of the generator during the test.

[0038] Specifically, Figure 1 A flow chart of a method for testing the excitation modulation coefficient of a generator provided in an embodiment of the present application.

[0039] like Figure 1 As shown, the generator excitation modulation coefficient test method includes the following steps:

[0040] In step S101, the terminal voltage and reactive power of the test generator at a first reactive power and the terminal voltage and reactive power of the test generator at a second reactive power are obtained, wherein the voltage set value and active power of the test generator remain unchanged.

[0041] Optionally, in some embodiments, obtaining the terminal voltage and reactive power of the test generator at a first reactive power, as well as the terminal voltage and reactive power of the test generator at a second reactive power, includes: controlling the test generator to operate according to the first reactive power, and obtaining the terminal voltage and reactive power of the test generator at the first reactive power; using the adjacent generator of the test generator to adjust the test generator from the first reactive power to the second reactive power, and controlling the test generator to operate according to the second reactive power, and obtaining the terminal voltage and reactive power of the test generator at the second reactive power.

[0042] It should be understood that the reactive power of the test generator is gradually adjusted from the first reactive power value Q1 to the second reactive power value Q2 by using the unidirectional adjustment of the reactive power of the adjacent generator of the test generator, that is, unidirectional upward adjustment or unidirectional downward adjustment, and the terminal voltage and reactive power of the test generator at the first reactive power Q1 and the terminal voltage and reactive power at the second reactive power Q2 are recorded.

[0043] Through the above technical solution, the test generator is adjusted from the first reactive power to the second reactive power by using the adjacent generator, avoiding direct large-scale reactive power adjustment of the test generator and ensuring the constancy of the test generator voltage set value.

[0044] It should be noted that:

[0045] (1) During the test, the voltage setting value and active power of the test generator remain unchanged. In order to prevent external automatic devices (such as automatic generation control AGC and automatic voltage control AVC, etc.) from adjusting the voltage and active power of the generator during the test, the AVC and AGC of the test generator should apply to the dispatching department for temporary exit.

[0046] 2) The excitation system operates in automatic mode.

[0047] 3) The test generator carries normal active power and 50%-100% of the rated reactive power, and the excitation adjustment coefficient value of the test generator is recorded.

[0048] 4) The adjacent generators carry normal active power and more than 40% of the rated reactive power.

[0049] 5) Gradually reduce (or increase, depending on site conditions) the rated reactive power of adjacent generators to 10% (the specific reduction in reactive power can be determined based on site conditions). After stabilization, record the terminal voltage and reactive power of the test generator. The change in the reactive power of the test generator is achieved through reactive power adjustment of adjacent generators. Test data from multiple power plants and units of different capacities show that when the reactive power of adjacent units increases by a certain value, the reactive power reduction of the test unit is much lower than the increase of the adjacent units, generally about 35% or even less of the adjacent units. Therefore, when the reactive power change amplitude of adjacent units is small, the reactive power and terminal voltage changes of the test unit are also small, which may affect the accuracy of the generator excitation adjustment coefficient measurement. Therefore, the reactive power adjustment amplitude of adjacent generators should be as large as possible. The increase or decrease in reactive power amplitude depends on the reactive power situation of the generator at that time. In principle, the upper limit of the reactive power output of adjacent generators and the test generator must not exceed the rated reactive power, and the lower limit must ensure that the low excitation limit does not operate.

[0050] (6) During the test, when adjusting the generator reactive power, the terminal voltage and plant voltage of the relevant units should be closely monitored to prevent the voltage from being too high or too low and affecting the safety of the units. At the same time, when adjusting the generator reactive power, it should be adjusted in one direction as much as possible, that is, one-way increase or decrease, to avoid the accuracy of the test record data being affected by factors such as changes in the operating mode of the power grid system and the static error rate of the excitation system.

[0051] In step S102, the excitation modulation coefficient of the test generator is calculated using the excitation modulation coefficient calculation formula based on the terminal voltage and reactive power of the test generator at the first reactive power, and the terminal voltage and reactive power of the test generator at the second reactive power, and it is determined whether the excitation modulation coefficient is consistent with the preset excitation modulation coefficient.

[0052] In some embodiments, the excitation adjustment coefficient is calculated as follows:

[0053]

[0054] Among them, C is the excitation adjustment coefficient of the test generator, U G1 The terminal voltage of the test generator at the first reactive power, U G2 The terminal voltage of the test generator at the second reactive power, U N is the rated voltage of the test generator (kV), Q1 is the reactive power of the test generator at the first reactive power, Q2 is the reactive power of the test generator at the second reactive power, S N is the rated capacity of the test generator (MVA).

[0055] Specifically, the test generator is controlled to operate according to the first reactive power Q1, and the terminal voltage U is recorded at this time. G1And reactive power Q1. Adjust the reactive power of the test generator to the second reactive power Q2, and record the terminal voltage U at this time G2 and reactive power Q2.

[0056] According to the terminal voltage U of the test generator at the first reactive power G1 and reactive power Q1, and the terminal voltage U of the test generator at the second reactive power G2 And reactive power Q2, the excitation regulation coefficient of the test generator is calculated using the excitation regulation coefficient calculation formula.

[0057] It should be noted that the basic principle of implementing the differential adjustment function in the excitation regulator is to add a value ΔU that is proportional to the generator power (mainly reactive power) in addition to the voltage set value, that is:

[0058] U set =U * G +ΔU * ; (1)

[0059] in:

[0060]

[0061] From formula (1) and (2), we can get:

[0062]

[0063] The test method of the embodiment of the present application is the "constant voltage given reactive power adjustment method", and the test steps are: keep the voltage given value U of the test generator set The reactive power of the test generator is changed by changing the reactive power of the adjacent generators, and the terminal voltage U before and after the reactive power of the test generator is recorded. G1 、U G2 And reactive power Q1, Q2. The reason for changing the reactive power of the test generator by changing the reactive power of the adjacent generator is mainly to ensure that the voltage set value U set Does not change, because if the reactive power of the test unit is changed directly, the voltage setting value U set will change, which will lead to errors in the test data.

[0064] Since the voltage given value U before and after the reactive power change of the test generator set And the active power P remains unchanged, it can be obtained from formula (3):

[0065]

[0066] Where U *G1 is the per-unit value of the terminal voltage before reactive power changes, U * G2 is the per-unit value of the terminal voltage after reactive power changes, Q1 * is the reactive power per unit value before reactive power changes, Q2 * It is the reactive power per unit value after reactive power changes.

[0067] Further formula can be derived:

[0068]

[0069] Further converting it into a nominal value, we can obtain the above-mentioned calculation formula for the excitation adjustment coefficient.

[0070] Through the above technical solution, the excitation regulation coefficient of the test generator can be accurately calculated by obtaining the terminal voltage and reactive power data of the test generator under different reactive powers and using the excitation regulation coefficient calculation formula, thereby reducing the error introduced by changes in the operating conditions of the generator.

[0071] In step S103 , if the excitation adjustment coefficient is consistent with the preset excitation adjustment coefficient, it is determined that the current excitation regulator adjustment coefficient meets the preset use condition; otherwise, it is determined that the current excitation regulator adjustment coefficient does not meet the preset use condition.

[0072] The preset excitation adjustment coefficient may be a threshold value preset by a user, a threshold value obtained through a limited number of experiments, or a threshold value obtained through a limited number of computer simulations, which is not specifically limited here.

[0073] It should be understood that the calculated excitation adjustment coefficient is compared with the preset excitation adjustment coefficient.

[0074] If the calculated excitation modulation coefficient is consistent with the preset excitation modulation coefficient, the excitation modulation coefficient of the test generator is considered to meet the requirements, that is, the current excitation regulator modulation coefficient is determined to meet the preset usage conditions. If the calculated excitation modulation coefficient is inconsistent with the preset excitation modulation coefficient, it is determined that the current excitation regulator modulation coefficient does not meet the preset usage conditions.

[0075] Through the above technical solution, the test generator is adjusted by the constant voltage given reactive power adjustment method. There is no need for the test generator to operate with zero active power or low power. As long as the active power of the unit remains stable during the test, the test data is accurate, avoiding the limitation of the traditional method that requires the generator to be in a zero power factor condition for a long time. The generator is allowed to be tested with any active power, reducing the instability of the generator operating under low power or zero power conditions, thereby improving the safety and efficiency of the test. By comparing the calculated excitation differential coefficient with the preset excitation differential coefficient, it can be determined whether the current excitation regulator meets the preset usage conditions, which helps to promptly discover possible problems with the excitation regulator and ensure that its performance meets the design requirements, thereby improving the stability and safety of the power system.

[0076] Optionally, in some embodiments, after determining that the current excitation regulator adjustment coefficient meets the preset use condition, the method includes: using the current excitation regulator adjustment coefficient to adjust the voltage and reactive power of the generator.

[0077] Optionally, in some embodiments, regulating the voltage and reactive power of the generator using the current excitation regulator adjustment coefficient includes: regulating the voltage and reactive power of the generator using a preset voltage adjustment formula, wherein the preset voltage adjustment formula is:

[0078]

[0079] Among them, U set is the voltage given value, U * G is the actual voltage per unit value at the machine end, Q * is the per-unit reactive power value of the generator, P * is the per-unit value of the generator active power, and C is the excitation adjustment coefficient of the test generator.

[0080] It is understood that after obtaining the excitation differential coefficient, the voltage differential formula is input into the excitation regulator as part of its control algorithm. The excitation regulator is started to perform real-time control of the test generator according to the voltage differential formula.

[0081] Through the above technical solution, the voltage and reactive power of the generator are regulated by using the verified excitation regulator adjustment coefficient, which can more accurately control the reactive power output by the generator, thereby optimizing the distribution of reactive power in the entire power system.

[0082] In order to enable those skilled in the art to further understand the generator excitation modulation coefficient testing method of the embodiment of the present application, it is described in detail below with reference to specific embodiments.

[0083] Step 1) The automatic generation control AGC and automatic voltage control AVC of the test generator are shut down, and the excitation system operates in automatic mode.

[0084] Step 2) Test the generator with normal active power and 50%-100% rated reactive power, and record the excitation modulation coefficient of the test generator.

[0085] Step 3) The adjacent generators carry normal active power and more than 40% of rated reactive power.

[0086] Step 4) Record the terminal voltage U of the test generator t10 and reactive power Q 10 .

[0087] Step 5) Reduce (or increase) the rated no-power of adjacent generators to 10% gradually. After stabilization, record the terminal voltage U of the test generator. t1 and reactive power Q1.

[0088] Step 6) Calculate the excitation differential coefficient according to the excitation differential coefficient calculation formula to determine whether the excitation differential coefficient test data is consistent with the design data.

[0089] according to Get the excitation adjustment coefficient:

[0090] Among them, U t10 is the terminal voltage (kV) of the test generator before reactive power changes, U t1 is the terminal voltage (kV) after the reactive power of the test generator changes, U t1N is the rated voltage of the test generator (kV), Q 10 is the reactive power (MVar) of the test generator before the reactive power changes, Q1 is the reactive power (MVar) of the test generator after the reactive power changes, S N1 It is the rated capacity of the test generator (MVA).

[0091] Step 7) Switch the channel and repeat steps 1-6 to perform the excitation adjustment coefficient test for another channel.

[0092] According to the generator excitation adjustment coefficient testing method proposed in the embodiment of the present application, since the conventional test method requires the generator active power to be zero, when the generator active power is zero or the generator power is low, the unit operation is unstable and there is a certain safety risk. At the same time, since it is impossible to maintain the generator zero power, only low power can be maintained during the test process, and the generator often has a certain error. The embodiment of the present application indirectly obtains the machine-end voltage and reactive power of the test generator at the first reactive power, as well as the machine-end voltage and reactive power of the test generator at the second reactive power by changing the reactive power of the adjacent generators. According to the machine-end voltage and reactive power of the test generator at the first reactive power, as well as the machine-end voltage and reactive power at the second reactive power, the excitation adjustment coefficient of the test generator is calculated using the excitation adjustment coefficient calculation formula. If the excitation adjustment coefficient is consistent with the preset excitation adjustment coefficient, it is determined that the current excitation regulator adjustment coefficient meets the preset usage conditions. Otherwise, it is determined that the current excitation regulator adjustment coefficient does not meet the preset usage conditions. This method does not require the generator active power to be zero or run at low power. It only needs to keep the generator active power stable during the test. It solves the problem that large generators cannot maintain zero power factor, which leads to certain errors in the test data. The test data using this method is highly accurate and also ensures that the unit can operate safely and stably during the test.

[0093] Next, a generator excitation modulation coefficient testing device proposed in accordance with an embodiment of the present application will be described with reference to the accompanying drawings.

[0094] Figure 2 It is a block diagram of a generator excitation modulation coefficient testing device according to an embodiment of the present application.

[0095] like Figure 2 As shown, the generator excitation modulation coefficient testing device 10 includes: an acquisition module 100 , a calculation module 200 and a judgment module 300 .

[0096] Among them, the acquisition module 100 is used to obtain the terminal voltage and reactive power of the test generator at the first reactive power, as well as the terminal voltage and reactive power of the test generator at the second reactive power, wherein the voltage set value and active power of the test generator remain unchanged; the calculation module 200 is used to calculate the excitation adjustment coefficient of the test generator according to the terminal voltage and reactive power of the test generator at the first reactive power, as well as the terminal voltage and reactive power of the test generator at the second reactive power, using the excitation adjustment coefficient calculation formula, and determine whether the excitation adjustment coefficient is consistent with the preset excitation adjustment coefficient; the judgment module 300 is used to determine that the current excitation regulator adjustment coefficient meets the preset usage conditions if the excitation adjustment coefficient is consistent with the preset excitation adjustment coefficient, otherwise, determine that the current excitation regulator adjustment coefficient does not meet the preset usage conditions.

[0097] Optionally, in some embodiments, the excitation adjustment coefficient is calculated as follows:

[0098]

[0099] Among them, C is the excitation adjustment coefficient of the test generator, U G1 The terminal voltage of the test generator at the first reactive power, U G2 The terminal voltage of the test generator at the second reactive power, U N is the rated voltage of the test generator, Q1 is the reactive power of the test generator at the first reactive power, Q2 is the reactive power of the test generator at the second reactive power, S N is the rated capacity of the test generator.

[0100] Optionally, in some embodiments, after determining that the current excitation regulator adjustment coefficient meets the preset usage conditions, the judgment module 300 is further configured to: use the current excitation regulator adjustment coefficient to adjust the voltage and reactive power of the generator.

[0101] Optionally, in some embodiments, the voltage and reactive power of the generator are adjusted using the current excitation regulator debugging coefficient. The judgment module 300 is further configured to: adjust the voltage and reactive power of the generator using a preset voltage differential adjustment formula, wherein the preset voltage differential adjustment formula is:

[0102]

[0103] Among them, U set is the voltage given value, U * G is the actual voltage per unit value at the machine end, Q * is the per-unit reactive power value of the generator, P * is the per-unit value of the generator active power, and C is the excitation adjustment coefficient of the test generator.

[0104] Optionally, in some embodiments, the acquisition module 100 is also used to: control the test generator to operate according to a first reactive power, and obtain the terminal voltage and reactive power of the test generator at the first reactive power; use the adjacent generator of the test generator to adjust the test generator from the first reactive power to the second reactive power, and control the test generator to operate according to the second reactive power, and obtain the terminal voltage and reactive power of the test generator at the second reactive power.

[0105] It should be noted that the above explanation of the embodiment of the generator excitation modulation coefficient testing method is also applicable to the generator excitation modulation coefficient testing device of this embodiment, and will not be repeated here.

[0106] According to the generator excitation adjustment coefficient test device proposed in the embodiment of the present application, the terminal voltage and reactive power of the test generator at the first reactive power and the terminal voltage and reactive power at the second reactive power are obtained, and the voltage setting value and active power of the test generator remain unchanged; based on the terminal voltage and reactive power at the first reactive power and the terminal voltage and reactive power at the second reactive power, the excitation adjustment coefficient of the test generator is calculated using the excitation adjustment coefficient calculation formula. If the excitation adjustment coefficient is consistent with the preset excitation adjustment coefficient, it is determined that the excitation regulator adjustment coefficient meets the use conditions; otherwise, it is determined that the excitation regulator adjustment coefficient does not meet the use conditions. In this way, the problem that large generators cannot maintain a zero power factor, which leads to certain errors in the test data, is solved. The constant voltage given reactive adjustment method does not require the generator active power to be zero or low power operation. As long as the active power of the unit remains stable during the test, the test data is accurate, ensuring the safe and stable operation of the generator during the test.

[0107] Figure 3 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application. The electronic device may include:

[0108] Memory 301 , processor 302 , and computer programs stored in the memory 301 and executable on the processor 302 .

[0109] When the processor 302 executes the program, the generator excitation modulation coefficient testing method provided in the above embodiment is implemented.

[0110] Furthermore, the electronic device further includes:

[0111] The communication interface 303 is used for communication between the memory 301 and the processor 302 .

[0112] The memory 301 is used to store computer programs that can be run on the processor 302 .

[0113] The memory 301 may include a high-speed RAM memory, and may also include a non-volatile memory (non-volatile memory), such as at least one disk memory.

[0114] If the memory 301, processor 302, and communication interface 303 are implemented independently, the communication interface 303, memory 301, and processor 302 can be interconnected via a bus and communicate with each other. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 3 Only one thick line is used in the diagram, but this does not mean that there is only one bus or one type of bus.

[0115] Optionally, in a specific implementation, if the memory 301, the processor 302 and the communication interface 303 are integrated on a chip, the memory 301, the processor 302 and the communication interface 303 can communicate with each other through an internal interface.

[0116] The processor 302 may be a central processing unit (CPU), an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present application.

[0117] An embodiment of the present application also provides a computer program product having a computer program stored thereon, which implements the above-mentioned generator excitation adjustment coefficient testing method when the program is executed by a processor.

[0118] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or N embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0119] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this application, "N" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0120] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may be performed out of the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present application belong.

[0121] The logic and / or steps represented in a flowchart or otherwise described herein, for example, can be considered a sequenced list of executable instructions for implementing the logical functions, and can be embodied in any computer program product for use with, or in conjunction with, an instruction execution system, apparatus, or device (e.g., a computer-based system, a system including a processor, or other system that can fetch and execute instructions from an instruction execution system, apparatus, or device). For purposes of this specification, a "computer program product" can be any device that can contain, store, communicate, propagate, or transmit a program for use with, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer program products include the following: an electrical connection having one or N wires (electronic devices), a portable computer disk cartridge (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disc read-only memory (CDROM). Furthermore, the computer program product may even be a paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or, if necessary, processing it in another suitable manner, and then storing it in a computer memory.

[0122] It should be understood that various parts of the present application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiment, the N steps or methods can be implemented using software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented using hardware, as in another embodiment, any one of the following technologies known in the art or a combination thereof can be used to implement: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application-specific integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0123] Those skilled in the art will understand that all or part of the steps in the method for implementing the above-mentioned embodiment can be completed by instructing related hardware through a program, and the program can be stored in a computer program product, which, when executed, includes one or a combination of the steps of the method embodiment.

[0124] In addition, the functional units in the various embodiments of the present application may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into a module. The above-mentioned integrated modules may be implemented in the form of hardware or in the form of software functional modules. If the integrated modules are implemented in the form of software functional modules and sold or used as independent products, they may also be stored in a computer program product.

[0125] The computer program product mentioned above may be a read-only memory, a magnetic disk, or an optical disk, etc. Although the embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application. Persons skilled in the art may make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present application.

Claims

1. A method for testing the excitation modulation coefficient of a generator, characterized in that: The following steps are involved: Obtaining a terminal voltage and reactive power of the test generator at a first reactive power, and a terminal voltage and reactive power of the test generator at a second reactive power, wherein a given voltage value and active power of the test generator remain unchanged; Calculate the excitation modulation coefficient of the test generator using an excitation modulation coefficient calculation formula based on the terminal voltage and reactive power of the test generator at a first reactive power and the terminal voltage and reactive power of the test generator at a second reactive power, and determine whether the excitation modulation coefficient is consistent with a preset excitation modulation coefficient; If the excitation adjustment coefficient is consistent with the preset excitation adjustment coefficient, it is determined that the current excitation regulator adjustment coefficient meets the preset usage condition; otherwise, it is determined that the current excitation regulator adjustment coefficient does not meet the preset usage condition.

2. The method according to claim 1, characterized in that The excitation adjustment coefficient calculation formula is: Wherein, C is the excitation modulation coefficient of the test generator, is the terminal voltage of the test generator at the first reactive power, is the terminal voltage of the test generator at the second reactive power, U N is the rated voltage of the test generator, Q1 is the reactive power of the test generator at the first reactive power, Q2 is the reactive power of the test generator at the second reactive power, S N is the rated capacity of the test generator.

3. The method according to claim 1, characterized in that After determining that the current excitation regulator adjustment coefficient meets the preset use conditions, it includes: The voltage and reactive power of the generator are regulated by utilizing the current excitation regulator regulation coefficient.

4. The method according to claim 3, characterized in that The step of regulating the voltage and reactive power of the generator by using the current excitation regulator adjustment coefficient includes: The voltage and reactive power of the generator are regulated using a preset voltage regulation formula, wherein the preset voltage regulation formula is: Among them, U set is the voltage given value, U * G is the actual voltage per unit value at the machine end, Q * is the per-unit reactive power value of the generator, P * is the per-unit value of the generator active power, and C is the excitation adjustment coefficient of the test generator.

5. The method according to claim 1, wherein The obtaining of the terminal voltage and reactive power of the test generator at a first reactive power, and the terminal voltage and reactive power of the test generator at a second reactive power, includes: Controlling the test generator to operate according to the first reactive power to obtain the terminal voltage and reactive power of the test generator at the first reactive power; The test generator is adjusted from the first reactive power to the second reactive power by using an adjacent generator of the test generator, and the test generator is controlled to operate according to the second reactive power to obtain the terminal voltage and reactive power of the test generator at the second reactive power.

6. A generator excitation modulation coefficient testing device, characterized in that: include: an acquisition module, configured to acquire a terminal voltage and reactive power of the test generator at a first reactive power, and a terminal voltage and reactive power of the test generator at a second reactive power, wherein a given voltage value and active power of the test generator remain unchanged; a calculation module, configured to calculate an excitation modulation coefficient of the test generator using an excitation modulation coefficient calculation formula based on the terminal voltage and reactive power of the test generator at a first reactive power and the terminal voltage and reactive power of the test generator at a second reactive power, and to determine whether the excitation modulation coefficient is consistent with a preset excitation modulation coefficient; The judgment module determines that the current excitation regulator adjustment coefficient meets the preset use condition if the excitation adjustment coefficient is consistent with the preset excitation adjustment coefficient; otherwise, the judgment module determines that the current excitation regulator adjustment coefficient does not meet the preset use condition.

7. The device according to claim 6, characterized in that The excitation adjustment coefficient calculation formula is: Wherein, C is the excitation modulation coefficient of the test generator, is the terminal voltage of the test generator at the first reactive power, is the terminal voltage of the test generator at the second reactive power, U N is the rated voltage of the test generator, Q1 is the reactive power of the test generator at the first reactive power, Q2 is the reactive power of the test generator at the second reactive power, S N is the rated capacity of the test generator.

8. The device according to claim 6, characterized in that After determining that the current excitation regulator adjustment coefficient meets the preset use conditions, the judgment module is further used to: The voltage and reactive power of the generator are regulated by utilizing the current excitation regulator regulation coefficient.

9. An electronic device, characterized in that: The invention comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the generator excitation modulation coefficient testing method according to any one of claims 1 to 5.

10. A computer program product having a computer program stored thereon, characterized in that: The program is executed by a processor to implement the generator excitation modulation coefficient testing method according to any one of claims 1 to 5.

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