CN108872851B - Method and system for measuring voltage difference rate of generator - Google Patents
Method and system for measuring voltage difference rate of generator Download PDFInfo
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Abstract
The invention relates to a method for measuring the voltage difference rate of a generator, which comprises the following steps: setting a generator to operate in a grid-connected mode, keeping the given value of the excitation regulator unchanged, and setting the difference regulating coefficient of the excitation regulator to be a nonzero value; withdrawing the PSS of the power system stabilizer of the generator set where the generator is positioned from operation, performing a voltage step test on the generator, and acquiring test recording data; respectively acquiring the first generator stator voltage and the first reactive power at any steady state moment before the step and the second generator stator voltage and the second reactive power at any steady state moment after the step according to the test wave recording data, and calculating a disturbance voltage-reactive power ratio and an incremental disturbance voltage-reactive power ratio; calculating a standard coefficient by using the rated voltage and the rated apparent power of the generator; the generator voltage difference rate is calculated according to the difference rate calculation formula, the field actual measurement of the generator voltage difference rate is realized, and a solution is provided for the convenient and accurate field actual measurement of the generator voltage difference rate.
Description
Technical Field
The present invention relates to the field of power system technology, and more particularly, to a method and system for measuring a generator voltage difference rate.
Background
With the development of large-scale interconnected power systems, the safe and stable operation of the power systems is increasingly important, and now in large power plants, several generator transformer sets run in parallel under the same bus, and the change of the exciting current of any one set not only affects the reactive current of the set, but also affects the reactive current of other parallel running sets, thereby causing the change of the bus voltage. In order to prevent the disordered distribution of the reactive power among the units, an additional voltage difference adjusting function is introduced into the excitation regulator, and the additional voltage difference adjusting function of the generator can ensure the reasonable distribution of the reactive power among the units and improve the running stability of the power system.
The proper voltage difference rate of the generator is not only required for economic operation of the unit, but also is a necessary measure for stabilizing the power grid, and is also a necessary experiment for newly putting the unit into operation, so that the method has great application value. The existing reactive power rejection method is suitable for measuring the voltage difference adjustment rate of a single generator set, and when a plurality of generator sets are operated in parallel, the measurement error is large.
Therefore, a method for measuring the voltage difference rate of the generator is needed to solve the problem of how to accurately measure the voltage difference rate of the generator.
Disclosure of Invention
The invention provides a method and a system for measuring a voltage difference rate of a generator, which aim to solve the problem of accurately measuring the voltage difference rate of the generator.
In order to solve the above problem, according to an aspect of the present invention, there is provided a method for measuring a generator voltage difference rate, characterized in that the method includes:
setting a generator to operate in a grid-connected mode, keeping the given value of the excitation regulator unchanged, and setting the difference regulating coefficient of the excitation regulator to be a nonzero value;
withdrawing a Power System Stabilizer (PSS) of a generator set where the generator is positioned from operation, performing a generator voltage step test, and acquiring test wave recording data;
respectively acquiring a first generator stator voltage and a first reactive power at any steady state moment before step change and a second generator stator voltage and a second reactive power at any steady state moment after step change according to the test wave recording data, and calculating a disturbance voltage-reactive power ratio and an incremental disturbance voltage-reactive power ratio by using the first generator stator voltage, the first reactive power, the second generator stator voltage and the second reactive power;
calculating a standard coefficient by using the rated voltage and the rated apparent power of the generator;
and calculating the voltage difference rate of the generator by utilizing the disturbance voltage-reactive ratio, the incremental disturbance voltage-reactive ratio and the standard coefficient according to a difference rate calculation formula.
Preferably, wherein the disturbance voltage-to-reactive ratio is calculated using the following formula:
wherein DUQ is the ratio of disturbance voltage to reactive power; u (t1) and Q (t1) are respectively the first generator stator voltage and the first reactive power at any steady-state time t1 before the step; u (t2) and Q (t2) are the second generator stator voltage and the second reactive power, respectively, at any steady-state time t2 after the step change.
Preferably, wherein the incremental disturbance voltage-to-reactive ratio is calculated using the formula:
wherein, DDUQ is increment disturbance voltage-reactive ratio; u shapeNIs the rated voltage of the generator; Δ U is the voltage step amount.
Preferably, the calculating the standard factor by using the rated voltage and the rated apparent power of the generator comprises:
wherein K is a standard coefficient; sNIs the rated apparent power of the generator; u shapeNIs the rated voltage of the generator.
Preferably, the adjustment rate calculation formula is:
D＝K(DUQ+DDUQ*UN)，
wherein D is the voltage difference adjustment rate of the generator, DUQ is the disturbance voltage-reactive power ratio, DDUQ is the incremental disturbance voltage-reactive power ratio, and K is the standard coefficient.
Preferably, wherein the method further comprises:
and calculating the error percentage of the voltage regulation rate of the generator and the set difference regulating coefficient of the excitation regulator so as to verify the measurement accuracy of the voltage regulation rate of the generator.
According to another aspect of the present invention, there is provided a system for measuring a generator voltage slip ratio, characterized in that the system comprises:
the setting unit is used for setting the grid-connected operation of the generator, keeping the given value of the excitation regulator unchanged, and setting the difference regulating coefficient of the excitation regulator to be a nonzero value;
the experimental wave recording data acquisition unit is used for quitting the PSS of the power system stabilizer of the generator set where the generator is located from running, performing a voltage step test on the generator and acquiring experimental wave recording data;
the disturbance voltage-reactive power ratio calculation unit is used for respectively obtaining a first generator stator voltage and a first reactive power at any steady state moment before step change and a second generator stator voltage and a second reactive power at any steady state moment after step change according to the test wave recording data, and calculating a disturbance voltage-reactive power ratio and an incremental disturbance voltage-reactive power ratio by using the first generator stator voltage, the first reactive power, the second generator stator voltage and the second reactive power;
the standard coefficient calculation unit is used for calculating a standard coefficient by utilizing the rated voltage and the rated apparent power of the generator;
and the difference adjusting rate calculating unit is used for calculating the voltage difference adjusting rate of the generator by utilizing the disturbance voltage-reactive ratio, the incremental disturbance voltage-reactive ratio and the standard coefficient according to a difference adjusting rate calculating formula.
Preferably, in the disturbance voltage-reactive ratio calculation unit, the disturbance voltage-reactive ratio is calculated by using the following formula:
wherein DUQ is the ratio of disturbance voltage to reactive power; u (t1) and Q (t1) are respectively the first generator stator voltage and the first reactive power at any steady-state time t1 before the step; u (t2) and Q (t2) are the second generator stator voltage and the second reactive power, respectively, at any steady-state time t2 after the step change.
Preferably, in the disturbance voltage-reactive ratio calculation unit, the incremental disturbance voltage-reactive ratio is calculated by using the following formula:
wherein, DDUQ is increment disturbance voltage-reactive ratio; u shapeNIs the rated voltage of the generator; Δ U is the voltage step amount.
Preferably, the standard coefficient calculating unit calculates a standard coefficient using a rated voltage and a rated apparent power of the generator, including:
wherein K is a standard coefficient; sNIs the rated apparent power of the generator; u shapeNIs the rated voltage of the generator.
Preferably, the adjustment rate calculation formula is:
D＝K(DUQ+DDUQ*UN)，
wherein D is the voltage difference adjustment rate of the generator, DUQ is the disturbance voltage-reactive power ratio, DDUQ is the incremental disturbance voltage-reactive power ratio, and K is the standard coefficient.
Preferably, wherein the system further comprises:
and the error calculation unit is used for calculating the error percentage of the voltage regulation rate of the generator and the difference regulation coefficient of the set excitation regulator so as to verify the measurement accuracy of the voltage regulation rate of the generator.
The invention provides a method and a system for measuring the voltage difference rate of a generator, wherein the given value of an excitation regulator is kept unchanged by setting the grid-connected operation of the generator, and the difference regulating coefficient of the excitation regulator is set to be a nonzero value; withdrawing the PSS of the power system stabilizer of the generator set where the generator is positioned from operation, performing a voltage step test on the generator, and acquiring test recording data; calculating a disturbance voltage-reactive ratio and an incremental disturbance voltage-reactive ratio according to the test wave recording data; calculating a standard coefficient by using the rated voltage and the rated apparent power of the generator; and calculating the voltage difference rate of the generator according to a difference rate calculation formula. The method realizes the measurement of the voltage difference adjustment rate of the generator based on the measured data, and the implementation process is simple and effective; the method has no special requirements on working conditions, is suitable for all working conditions under the condition of grid connection, has good robustness of a calculation result, and provides a solution for convenient and accurate field actual measurement of the voltage difference regulation rate of the generator.
Drawings
A more complete understanding of exemplary embodiments of the present invention may be had by reference to the following drawings in which:
FIG. 1 is a flow chart of a method 100 for measuring a generator voltage delta ratio according to an embodiment of the present invention;
FIG. 2 is a recording diagram of + -2% step response test without PSS according to the actual measurement test recording results of the embodiment of the present invention; and
fig. 3 is a schematic diagram of a system 300 for measuring a generator voltage difference rating according to an embodiment of the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
FIG. 1 is a flow chart of a method 100 for measuring a generator voltage delta ratio according to an embodiment of the present invention. As shown in fig. 1, the embodiment of the present invention provides a method for measuring a voltage difference rate of a generator, by setting a generator to be in grid-connected operation, keeping a given value of an excitation regulator constant, and setting a difference coefficient of the excitation regulator to a non-zero value; withdrawing the PSS of the power system stabilizer of the generator set where the generator is positioned from operation, performing a voltage step test on the generator, and acquiring test recording data; calculating a disturbance voltage-reactive ratio and an incremental disturbance voltage-reactive ratio according to the test wave recording data; calculating a standard coefficient by using the rated voltage and the rated apparent power of the generator; and calculating the voltage difference rate of the generator according to a difference rate calculation formula. The embodiment of the invention realizes the measurement of the voltage difference adjustment rate of the generator based on the measured data, and the implementation process is simple and effective; the method has no special requirements on working conditions, is suitable for all working conditions under the condition of grid connection, has good robustness of a calculation result, and provides a solution for convenient and accurate field actual measurement of the voltage difference regulation rate of the generator. The method 100 for measuring the voltage difference rate of the generator provided by the embodiment of the invention starts from step 101, sets the grid-connected operation of the generator in step 101, keeps the given value of the excitation regulator unchanged, and sets the difference coefficient of the excitation regulator to be a non-zero value.
Preferably, in step 102, the power system stabilizer PSS of the generator set where the generator is located is withdrawn from operation, a voltage step test of the generator is performed, and test recording data is obtained.
Preferably, in step 103, a first generator stator voltage and a first reactive power at any steady-state time before the step change and a second generator stator voltage and a second reactive power at any steady-state time after the step change are respectively obtained according to the test wave recording data, and the first generator stator voltage, the first reactive power, the second generator stator voltage and the second reactive power are used to calculate a disturbance voltage-reactive power ratio and an incremental disturbance voltage-reactive power ratio.
Preferably, wherein the disturbance voltage-to-reactive ratio is calculated using the following formula:
wherein DUQ is the ratio of disturbance voltage to reactive power; u (t1) and Q (t1) are respectively the first generator stator voltage and the first reactive power at any steady-state time t1 before the step; u (t2) and Q (t2) are the second generator stator voltage and the second reactive power, respectively, at any steady-state time t2 after the step change.
Preferably, wherein the incremental disturbance voltage-to-reactive ratio is calculated using the formula:
wherein, DDUQ is increment disturbance voltage-reactive ratio; u shapeNIs the rated voltage of the generator; Δ U is the voltage step amount.
Preferably, the standard factor is calculated at step 104 using the rated voltage and rated apparent power of the generator.
Preferably, the calculating the standard factor by using the rated voltage and the rated apparent power of the generator comprises:
wherein K is a standard coefficient; sNIs the rated apparent power of the generator; u shapeNIs the rated voltage of the generator.
Preferably, the generator voltage difference is calculated in step 105 according to the difference calculation formula by using the disturbance voltage-reactive ratio, the incremental disturbance voltage-reactive ratio and the standard coefficient.
Preferably, the adjustment rate calculation formula is:
D＝K(DUQ+DDUQ*UN)，
wherein D is the voltage difference adjustment rate of the generator, DUQ is the disturbance voltage-reactive power ratio, DDUQ is the incremental disturbance voltage-reactive power ratio, and K is the standard coefficient.
Preferably, wherein the method further comprises:
and calculating the error percentage of the voltage regulation rate of the generator and the set difference regulating coefficient of the excitation regulator so as to verify the measurement accuracy of the voltage regulation rate of the generator.
According to the invention, the accuracy of the generator voltage difference rate actual measurement method is verified through analyzing the measurement result of the generator set example, and the fact that the actual measurement method has strong engineering practicability is shown.
The following specifically exemplifies embodiments of the present invention
The invention is further described in detail by taking the test result of a certain 600MW thermal power generating unit shown in fig. 2 as an example, but the invention is not limited to the given example. FIG. 2 is a graph of + -2% step response test recordings without PSS in accordance with an embodiment of the present invention. UAB and Q are response curves for generator stator voltage u (t) and reactive power Q (t), respectively, as shown in fig. 2. The starting time of the voltage step of the generator is 1.8s, the ending time of the voltage step of the generator is 10.9s, the stator voltage and the reactive power of the steady-state point motor before the step can be read within 0s-1.8s, and the stator voltage and the reactive power of the steady-state point motor after the step can be read within 1.8s-10.9 s.
The steps of measuring the voltage difference rate of the generator of the embodiment of the invention are as follows:
step 1: and adjusting the working condition of the test generator set, keeping the excitation regulator working normally when the generator is in grid-connected operation, setting the difference regulating coefficient of the excitation regulator to be a non-zero value Dset, and setting the reference range to be 0.01-0.04 (per unit value) in the voltage step test of the generator.
Step 2: and (3) stopping the test generator set PSS from running, carrying out a generator voltage step test, setting the step quantity to be delta U, wherein the step quantity delta U is not specifically limited, and recording the generator stator voltage U (t) and the reactive power Q (t) response curve in the test process by using a wave recording device.
Step 3: and respectively acquiring the stator voltage and the reactive power of the motor at the steady state point before and after the step change in the oscillogram according to the response curve, and calculating the disturbance voltage-reactive power ratio and the incremental disturbance voltage-reactive power ratio.
Wherein, the disturbance voltage-reactive ratio calculation formula is as follows:
wherein, U (t1) and Q (t1) are the generator stator voltage and reactive power at any time t1 before the voltage step, and U (t2) and Q (t2) are the generator stator voltage and reactive power at any time t2 after the voltage step and the voltage stabilization.
The incremental disturbance voltage-reactive ratio calculation formula is as follows:
wherein, U (t2) and Q (t2) are respectively the stator voltage and the reactive power of the generator at any time t2 after voltage step and voltage stabilization, UNIs the rated voltage of the generator.
Step 4: the standard factor is calculated from the rated voltage and the rated apparent power of the generator.
Wherein, the calculation formula of the standard coefficient is as follows:
wherein, UNIs the rated voltage of the generator, SNIs the rated apparent power of the generator.
Step 5: and calculating the actually measured voltage difference-adjusting rate D of the generator according to the disturbance voltage-reactive ratio, the incremental disturbance voltage-reactive ratio and the standard coefficient.
The actually measured calculation formula of the generator voltage difference adjustment rate D is as follows:
D＝K(DUQ+DDUQ*UN)，
wherein D is a difference adjustment coefficient, DUQ is a disturbance voltage-reactive power ratio, DUQ is an incremental disturbance voltage-reactive power ratio, and K is a standard coefficient.
Step 6: and calculating the error percentage of the actually measured generator voltage difference regulating rate and the difference regulating coefficient of the set excitation regulator so as to verify the measurement accuracy of the generator voltage difference regulating rate.
Table 1 shows the measured results of the generator voltage difference adjustment rate according to the embodiment of the present invention. The difference adjusting coefficient of the excitation regulator is 0.05, and the error of the difference adjusting coefficient and the measured value is small.
TABLE 1 actual test results
According to the test result, the error between the measured generator voltage difference rate and the set value of the additional difference coefficient is quite small, and the method provided by the invention has the characteristic of multi-working-condition adaptation, so that the generator voltage difference rate measurement has the effect of good robustness of the calculation result under the condition of grid-connected operation, and the operation requirement of a power grid can be met, thereby verifying the effectiveness of the method provided by the invention in the actual system analysis.
Fig. 3 is a schematic diagram of a system 300 for measuring a generator voltage difference rating according to an embodiment of the present invention. As shown in fig. 3, an embodiment of the present invention provides a system 300 for measuring a generator voltage difference rate, comprising: the device comprises a setting unit 301, an experimental wave recording data acquisition unit 302, a disturbance voltage-reactive ratio calculation unit 303, a standard coefficient calculation unit 304 and a deviation ratio calculation unit 305. Preferably, in the setting unit 301, the generator is set to operate in a grid-connected mode, the given value of the excitation regulator is kept unchanged, and the difference regulating coefficient of the excitation regulator is set to be a nonzero value.
Preferably, in the experimental wave recording data obtaining unit 302, the power system stabilizer PSS of the generator set where the generator is located is quitted from operating, and a voltage step test of the generator is performed to obtain experimental wave recording data.
Preferably, in the disturbance voltage-reactive power ratio calculation unit 303, a first generator stator voltage and a first reactive power at any steady-state time before the step change and a second generator stator voltage and a second reactive power at any steady-state time after the step change are respectively obtained according to the test wave recording data, and the disturbance voltage-reactive power ratio and the incremental disturbance voltage-reactive power ratio are calculated by using the first generator stator voltage, the first reactive power, the second generator stator voltage, and the second reactive power.
Preferably, in the disturbance voltage-reactive ratio calculation unit, the disturbance voltage-reactive ratio is calculated by using the following formula:
wherein DUQ is the ratio of disturbance voltage to reactive power; u (t1) and Q (t1) are respectively the first generator stator voltage and the first reactive power at any steady-state time t1 before the step; u (t2) and Q (t2) are the second generator stator voltage and the second reactive power, respectively, at any steady-state time t2 after the step change.
Preferably, in the disturbance voltage-reactive ratio calculation unit, the incremental disturbance voltage-reactive ratio is calculated by using the following formula:
wherein, DDUQ is increment disturbance voltage-reactive ratio; u shapeNIs the rated voltage of the generator; Δ U is the voltage step amount.
Preferably, at the standard factor calculation unit 304, a standard factor is calculated using the rated voltage and the rated apparent power of the generator.
Preferably, the standard coefficient calculating unit calculates a standard coefficient using a rated voltage and a rated apparent power of the generator, including:
wherein K is a standard coefficient; sNIs the rated apparent power of the generator; u shapeNIs the rated voltage of the generator.
Preferably, in the difference adjustment rate calculating unit 305, the generator voltage difference adjustment rate is calculated according to a difference adjustment rate calculating formula by using the disturbance voltage-reactive ratio, the incremental disturbance voltage-reactive ratio and the standard coefficient.
Preferably, the adjustment rate calculation formula is:
D＝K(DUQ+DDUQ*UN)，
wherein D is the voltage difference adjustment rate of the generator, DUQ is the disturbance voltage-reactive power ratio, DDUQ is the incremental disturbance voltage-reactive power ratio, and K is the standard coefficient.
Preferably, wherein the system further comprises: and the error calculation unit is used for calculating the error percentage of the voltage regulation rate of the generator and the difference regulation coefficient of the set excitation regulator so as to verify the measurement accuracy of the voltage regulation rate of the generator.
The system 300 for measuring the generator voltage difference rate according to the embodiment of the present invention corresponds to the method 100 for measuring the generator voltage difference rate according to another embodiment of the present invention, and will not be described herein again.
The invention has been described with reference to a few embodiments. However, other embodiments of the invention than the one disclosed above are equally possible within the scope of the invention, as would be apparent to a person skilled in the art from the appended patent claims.
Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a/an/the [ device, component, etc ]" are to be interpreted openly as referring to at least one instance of said device, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.
Claims (12)
1. A method for measuring a generator voltage slip ratio, the method comprising:
setting a generator to operate in a grid-connected mode, keeping the given value of the excitation regulator unchanged, and setting the difference regulating coefficient of the excitation regulator to be a nonzero value;
withdrawing the PSS of the power system stabilizer of the generator set where the generator is positioned from operation, performing a voltage step test on the generator, and acquiring test recording data;
respectively acquiring a first generator stator voltage and a first reactive power at any steady state moment before step change and a second generator stator voltage and a second reactive power at any steady state moment after step change according to the test wave recording data, calculating a disturbance voltage-reactive power ratio by using the first generator stator voltage, the first reactive power, the second generator stator voltage and the second reactive power, and calculating an incremental disturbance voltage-reactive power ratio by using the first reactive power, the second reactive power, the rated voltage of the generator and the voltage step quantity;
calculating a standard coefficient by using the rated voltage and the rated apparent power of the generator;
and calculating the voltage difference rate of the generator by utilizing the disturbance voltage-reactive ratio, the incremental disturbance voltage-reactive ratio and the standard coefficient according to a difference rate calculation formula.
2. The method of claim 1, wherein the disturbance voltage-to-reactive ratio is calculated using the following equation:
wherein DUQ is the ratio of disturbance voltage to reactive power; u (t1) and Q (t1) are respectively the first generator stator voltage and the first reactive power at any steady-state time t1 before the step; u (t2) and Q (t2) are the second generator stator voltage and the second reactive power, respectively, at any steady-state time t2 after the step change.
3. The method of claim 2, wherein the incremental disturbance voltage-to-reactive ratio is calculated using the following equation:
wherein, DDUQ is increment disturbance voltage-reactive ratio; u shapeNIs the rated voltage of the generator; Δ U is the voltage step amount.
4. The method of claim 3, wherein calculating the standard factor using the rated voltage and the rated apparent power of the generator comprises:
wherein K is a standard coefficient; sNIs the rated apparent power of the generator; u shapeNIs the rated voltage of the generator.
5. The method of claim 4, wherein the adjustment ratio is calculated by:
D＝K(DUQ+DDUQ*UN)，
wherein D is the voltage difference adjustment rate of the generator, DUQ is the disturbance voltage-reactive power ratio, DDUQ is the incremental disturbance voltage-reactive power ratio, and K is the standard coefficient.
6. The method of claim 1, further comprising:
and calculating the error percentage of the voltage regulation rate of the generator and the set difference regulating coefficient of the excitation regulator so as to verify the measurement accuracy of the voltage regulation rate of the generator.
7. A system for measuring a generator voltage slip ratio, the system comprising:
the setting unit is used for setting the grid-connected operation of the generator, keeping the given value of the excitation regulator unchanged, and setting the difference regulating coefficient of the excitation regulator to be a nonzero value;
the experimental wave recording data acquisition unit is used for quitting the PSS of the power system stabilizer of the generator set where the generator is located from running, performing a voltage step test on the generator and acquiring experimental wave recording data;
the disturbance voltage-reactive power ratio calculation unit is used for respectively obtaining a first generator stator voltage and a first reactive power at any steady state moment before step change and a second generator stator voltage and a second reactive power at any steady state moment after step change according to the test wave recording data, calculating a disturbance voltage-reactive power ratio by using the first generator stator voltage, the first reactive power, the second generator stator voltage and the second reactive power, and calculating an increment disturbance voltage-reactive power ratio by using the first reactive power, the second reactive power, the rated voltage of the generator and the voltage step amount;
the standard coefficient calculation unit is used for calculating a standard coefficient by utilizing the rated voltage and the rated apparent power of the generator;
and the difference adjusting rate calculating unit is used for calculating the voltage difference adjusting rate of the generator by utilizing the disturbance voltage-reactive ratio, the incremental disturbance voltage-reactive ratio and the standard coefficient according to a difference adjusting rate calculating formula.
8. The system according to claim 7, wherein the disturbance voltage-reactive ratio is calculated at the disturbance voltage-reactive ratio calculation unit using the following formula:
wherein DUQ is the ratio of disturbance voltage to reactive power; u (t1) and Q (t1) are respectively the first generator stator voltage and the first reactive power at any steady-state time t1 before the step; u (t2) and Q (t2) are the second generator stator voltage and the second reactive power, respectively, at any steady-state time t2 after the step change.
9. The system of claim 8, wherein the incremental disturbance voltage-to-reactive ratio is calculated at the disturbance voltage-to-reactive ratio calculation unit using the following formula:
wherein, DDUQ is increment disturbance voltage-reactive ratio; u shapeNIs the rated voltage of the generator; Δ U is the voltage step amount.
10. The system of claim 9, wherein the standard factor calculation unit calculates a standard factor using a rated voltage and a rated apparent power of the generator, comprising:
wherein K is a standard coefficient; sNIs the rated apparent power of the generator; u shapeNIs the rated voltage of the generator.
11. The system of claim 10, wherein the adjustment rate is calculated by the equation:
D＝K(DUQ+DDUQ*UN)，
wherein D is the voltage difference adjustment rate of the generator, DUQ is the disturbance voltage-reactive power ratio, DDUQ is the incremental disturbance voltage-reactive power ratio, and K is the standard coefficient.
12. The system of claim 7, further comprising:
and the error calculation unit is used for calculating the error percentage of the voltage regulation rate of the generator and the difference regulation coefficient of the set excitation regulator so as to verify the measurement accuracy of the voltage regulation rate of the generator.
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| CN109936148B (en) * | 2019-01-22 | 2021-03-02 | 国网浙江省电力有限公司电力科学研究院 | Measuring method and online monitoring system for reactive current compensation rate of generator set |
| CN110514892B (en) * | 2019-07-18 | 2022-09-23 | 中国电力科学研究院有限公司 | Method and system for measuring reactive current compensation rate based on voltage step method |
| CN111190105A (en) * | 2020-03-03 | 2020-05-22 | 贵州电网有限责任公司 | Dynamic test system and test analysis method for difference adjustment coefficient of generator set |
| CN112415383B (en) * | 2020-09-30 | 2023-07-25 | 广西电网有限责任公司电力科学研究院 | Method and system for measuring adjustment difference coefficient of generator excitation system on site |
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