CN104569805A - Static testing method of excitation device - Google Patents
Static testing method of excitation device Download PDFInfo
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- CN104569805A CN104569805A CN201310476737.6A CN201310476737A CN104569805A CN 104569805 A CN104569805 A CN 104569805A CN 201310476737 A CN201310476737 A CN 201310476737A CN 104569805 A CN104569805 A CN 104569805A
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Abstract
The invention discloses a static testing method of an excitation device. The static testing method comprises the following steps: S1, setting power frequency anode voltage of a silicon controlled rectifier of the excitation device; S2, setting a given nominal value of an excitation regulator in the excitation device as 0, and then setting feedback voltage of the excitation regulator as 0; S3, inputting a power generator operation state signal and a rotational speed signal parameter for simulating the state of a power generator operating at rated rotational speed; S4, exciting the excitation device; S5, inputting a white noise test signal into the excitation regulator, measuring a test parameter of the excitation device, generating a corresponding test result according to the measured test parameter. By implementing the static testing method disclosed by the invention, the following benefits can be realized, various actual parameters of the excitation device can be simulated through a static testing system of the excitation device provided by the invention, and the testing of the excitation device can be completed by inputting the corresponding simulation parameters; furthermore, the testing of the excitation device is not required to be performed on the site of the power generator and the testing cost is reduced.
Description
Technical field
The present invention relates to field of power, more particularly, relate to a kind of static test and device of excitation unit.
Background technology
Along with the development of power industry, the scale of electric system is constantly expanded, system cloud gray model is also more and more higher for the requirement of reliability, security and economy, and in order to improve stability and the security of electric system, excitation unit is that the important control assembly of electric system is indispensable.
Field regulator in excitation unit can the output voltage of regulator generator group, therefore has sizable effect to the stability improving electric system Parallel sets.
In prior art, when excitation unit is tested, whole genset must be made at the scene to run, therefore the cost tested is very high, genset just can complete the test of excitation after having to pass through and repeatedly starting, stop and impacting simultaneously, therefore very large risk is also existed to the equipment such as genset itself, may device damage be caused.In addition, if excitation unit itself is newly developed, then generally all also do not complete the exploitation of excitation unit software kit, make inconvenience at the scene test excitation unit newly developed like this.
Summary of the invention
The technical problem to be solved in the present invention is, higher for the cost of on-the-spot test excitation unit in the above-mentioned prior art of prior art, genset just can complete the test of excitation after having to pass through and repeatedly starting, stop and impacting, therefore also have to the equipment such as genset itself risk that existence is very large, and to match the defect that software cannot develop in time for excitation unit newly developed, a kind of method of testing of excitation unit is provided.
The technical solution adopted for the present invention to solve the technical problems is: the static test constructing a kind of excitation unit, comprises the steps:
S1, the silicon controlled power frequency anode voltage of described excitation unit is set;
S2, the given nominal of field regulator in described excitation unit is set to 0, then the feedback voltage of described field regulator is set to 0;
S3, to operation state of generator signal and the tach signal parameter of the input of described field regulator for simulating the state of generator operation under rated speed;
S4, to described excitation unit excitation;
S5, to described field regulator input white noise test signal, measure the test parameter of described excitation unit, and generate corresponding test result according to the test parameter recorded.
In the static test of excitation unit of the present invention, the frequency of operation anode voltage of described excitation unit is lower than rectifier bridge nominal anode voltage.
In the static test of excitation unit of the present invention, the frequency of described white noise signal is 0.1-10HZ.
In the static test of excitation unit of the present invention, described test parameter comprises at least one in D/A (digital revolving die plan) voltage in described excitation unit, A/D (analog-to-digital) voltage parameter, PID (proportion integration differentiation) frequency characteristic parameter, PSS (power system stabilizer, PSS) frequency characteristic parameter.
In the static test of excitation unit of the present invention, when described test parameter comprises D/A voltage parameter, A/D voltage parameter in described excitation unit, described step S5 comprises following sub-step:
S51a, to the stator voltage of described field regulator input for simulating the state that described generator works under nominal operation situation;
S52a, by field regulator D/A conversion carried out to described stator voltage and export described D/A voltage;
The voltage circuit of S53a, closed described excitation system, and by field regulator A/D conversion carried out to described stator voltage and export described A/D voltage;
S54a, respectively record described field regulator export D/A, A/D voltage measuring value, complete the test to D/A, A/D voltage parameter in described excitation unit.
When comprising the PID frequency characteristic parameter in described excitation unit at test parameter described in the static test of excitation unit of the present invention, described step S5 comprises following sub-step:
S51b, carry out the first Model Identification calculating according to the parameter of described field regulator, obtain amplitude versus frequency characte and the phase-frequency characteristic result of calculation of the test link of described PID frequency characteristic parameter;
S52b, described field regulator gather the input signal of the white noise signal of spectrum analyzer output the test link as described PID frequency characteristic parameter;
S53b, described white noise signal is carried out 0.1 step-length discrete computing and carry out D/A conversion, output to the output signal of described spectrum analyzer as the test link of described PID frequency characteristic parameter;
S54b, measured amplitude versus frequency characte and the phase-frequency characteristic of described input signal and described output signal by described spectrum analyzer;
Amplitude versus frequency characte and phase-frequency characteristic that S55b, determining step S54b measure and amplitude versus frequency characte described in step S51b and phase-frequency characteristic result of calculation whether consistent, if unanimously, then judge that the PID frequency characteristic parameter testing in described excitation unit is correct; If inconsistent, then judge the PID frequency characteristic parameter testing mistake in described excitation unit.
In the static test of excitation unit of the present invention, the computing formula of described first model is:
In described formula, k
pfor proportional gain, T
c1for integration time constant, T
b1for integration bandwidth control time constant, T
c2for derivative time constant, T
b2for differential bandwidth control time constant, s is differentiating operator.
In the method for testing of excitation unit of the present invention, when test parameter comprises the PSS frequency characteristic parameter in described excitation unit, described step S5 comprises following sub-step:
S51c, carry out the second Model Identification calculating according to the parameter of described excitation unit, obtain amplitude versus frequency characte and the phase-frequency characteristic result of calculation of the test link of described PSS frequency characteristic parameter;
S52c, on described field regulator, add reference voltage, described field regulator gathers white noise signal that spectrum analyzer exports and the input signal of test link as described PSS frequency characteristic parameter;
S53c, described white noise signal is carried out 0.1 step-length discrete computing and carry out D/A conversion, output to the output signal of described spectrum analyzer as the test link of described PSS frequency characteristic parameter;
S54c, the amplitude versus frequency characte being measured the output signal of described input signal and described input signal by described spectrum analyzer and phase-frequency characteristic;
Amplitude versus frequency characte and phase-frequency characteristic that S56c, determining step S54c measure and amplitude versus frequency characte described in step S51c and phase-frequency characteristic result of calculation whether consistent, if unanimously, then judge that the PSS frequency characteristic parameter testing in described excitation unit is correct; If inconsistent, then judge the PSS frequency characteristic parameter testing mistake in described excitation unit.
In the static test of excitation unit of the present invention, the computing formula of described second model is:
In described formula, k
pssfor PSS proportional gain, T
c1for integration time constant, T
b1for integration bandwidth control time constant, T
wfor every straight time constant, k
s2for inertia constant, T
7be the 7th integration time constant, s is differentiating operator.
In the static test of excitation unit of the present invention, described PSS frequency characteristic parameter comprises gain link parameter, lead-lag link parameter, at least one in straight link parameter, inertial element parameter.
Implement the static test system of excitation unit of the present invention, there is following beneficial effect: the static test system of the excitation unit provided by the embodiment of the present invention, the various actual parameters of excitation unit can be simulated, no matter be existing excitation unit, or excitation unit newly developed, can complete test to excitation unit by the corresponding analog parameter of input, and do not need to carry out actual test to excitation unit genset is on-the-spot, simple to operate and safety, has saved testing cost.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the process flow diagram of the method for testing of the excitation unit that a preferred embodiment of the present invention provides;
Fig. 2 be the described test parameter shown in Fig. 1 comprise in described excitation unit D/A voltage, A/D voltage parameter time the step S5 particular flow sheet of sub-step that comprises;
Fig. 3 be the described test parameter shown in Fig. 1 comprise in described excitation unit PID frequency characteristic parameter time the step S5 particular flow sheet of sub-step that comprises;
Fig. 4 be the described test parameter shown in Fig. 1 comprise in described excitation unit PSS frequency characteristic parameter time the step S5 particular flow sheet of sub-step that comprises.
Embodiment
In order to there be understanding clearly to technical characteristic of the present invention, object and effect, now contrast accompanying drawing and describe the specific embodiment of the present invention in detail.
As shown in Figure 1, in the embodiment of the method for testing of the excitation unit provided in the embodiment of the present invention, comprise the following steps:
S1, the silicon controlled power frequency anode voltage of described excitation unit is set; This step is the silicon controlled conduction angle characteristic in order to observe excitation unit, and controllable silicon is controlled rectification element, and conduction angle refers in one-period, is controlled the angle of its conducting by power electronic devices (as thyristor).Alternating current is generally sinusoidal waveform, and its one-period is 360 degree, and positive half cycle accounts for 180 degree, and negative half period accounts for 180 degree.When alternating current is by controllable silicon, AC current can be allowed to pass through to control to make it start conducting at the unspecified angle place of 0-180 degree, when positive half cycle is added to silicon controlled anode, when a certain angle of 180 degree, control pole at silicon controlled and add a trigger pulse, such as add a pulse at 30 degree, controllable silicon can only by the remaining electric current of 150 degree.This start angle that controllable silicon is conducted electricity 30 degree of angles as escribed above are called pilot angle, represent with α.The electrical angle that thyristor is in on-state in a power cycle is called conduction angle, represents with θ, 150 degree as escribed above, so θ=π-α.
S2, the given nominal of field regulator in described excitation unit is set to 0, then the feedback voltage of described field regulator is set to 0; Only have after 0 is set to the given nominal of field regulator, just can produce feedback, and then the feedback voltage of just described field regulator is set to 0, form open loop.
S3, the operation state of generator signal that should produce when field regulator input generator operation is under rated speed and tach signal parameter, for simulating the state of generator operation under rated speed; By software simulation generator under rated speed, described operation state of generator signal and tach signal parameter, can avoid genset after repeatedly starting, stop and impacting, just can complete the test of excitation, therefore can greatly reduce the equipment such as genset itself run produce risk.In advance the tach signal of generator and voltage signal can be converted to rotating speed high frequency sinusoidal simulating signal and running status simulating signal, and using described rotating speed high frequency sinusoidal simulating signal and the running status simulating signal relevant parameter as emulator software, export to field regulator again, so just can not need to start actual generator.
S4, to described excitation unit excitation; Can by being automatic operational mode by described field regulator, make described excitation unit excitation, specifically can terminate level described field regulator is set to automatic operational mode by arranging the automatic given lower limit of field regulator, automatic given higher limit and auxiliary excitation.
S5, to field regulator input white noise test signal, measure the test parameter of described excitation unit, and generate corresponding test result according to the test parameter recorded.In the present embodiment, measured the test parameter of described excitation unit by Aglient35670A spectrum analyzer, record test parameter by WFLC electricity recorder analyser and generate test result according to test parameter.The structure of these two kinds of instruments and method of operating are all prior aries, herein without the need to repeating.
Preferably, the silicon controlled frequency of operation anode voltage of described excitation unit is lower than rectifier bridge nominal anode voltage.
Preferably, the frequency of described white noise signal is 0.1-10HZ, and this is also the frequency range that the excitation unit of general grid requirements should possess.
Preferably, described test parameter comprises one or more in D/A voltage in described excitation unit, A/D voltage parameter, PID frequency characteristic parameter, PSS frequency characteristic parameter.Measurement PID frequency characteristic parameter is the response in order to correct regulation and control system, power system stabilizer is a kind of additional excitation control device in order to power oscillation damping, introduce the additional signal leading over axle rotating speed, produce a positive damping torque, go to overcome the negative damping torque produced in field regulator.For improving power system damping, solving low-frequency oscillation problem, power system dynamic stability can be improved.
Preferably, as shown in Figure 2, when described test parameter is D/A voltage, A/D voltage parameter in described excitation unit, step S5 comprises following sub-step:
S51a, to input to field regulator described generator operation in a rated operation time the stator voltage that should have, be used for simulating the rated operation of described generator;
S52a, by field regulator D/A conversion carried out to described stator voltage and export described D/A voltage;
The voltage circuit of S53a, closed described excitation system, and by field regulator A/D conversion carried out to described stator voltage and export described A/D voltage;
S54a, respectively record described field regulator export D/A, A/D voltage measuring value, complete the test to D/A, A/D voltage parameter in described excitation unit.Recording process can be completed by WFLC electricity recorder analyser.
Preferably, as shown in Figure 3, when described test parameter is the PID frequency characteristic parameter in described excitation unit, step S5 comprises following sub-step:
S51b, carry out the first Model Identification calculating according to the parameter of described field regulator, obtain amplitude versus frequency characte and the phase-frequency characteristic result of calculation of the test link of described PID frequency characteristic parameter;
S52b, described field regulator gather the input signal of the white noise signal of spectrum analyzer output the test link as described PID frequency characteristic parameter;
S53b, described white noise signal is carried out 0.1 step-length discrete computing and carry out D/A conversion, output to the output signal of described spectrum analyzer as the test link of described PID frequency characteristic parameter;
S54b, measured amplitude versus frequency characte and the phase-frequency characteristic of described input signal and described output signal by described spectrum analyzer;
Amplitude versus frequency characte and phase-frequency characteristic that S55b, determining step S54b measure and amplitude versus frequency characte described in step S51b and phase-frequency characteristic result of calculation whether consistent, if unanimously, then judge that the PID frequency characteristic parameter testing in described excitation unit is correct; If inconsistent, then judge the PID frequency characteristic parameter testing mistake in described excitation unit.Spectrum analyzer can be Aglient35670A spectrum analyzer.
Preferably, the computing formula of described first model is:
In described formula, k
pfor proportional gain, T
c1for integration time constant, T
b1for integration bandwidth control time constant, T
c2for derivative time constant, T
b2for differential bandwidth control time constant, s is differentiating operator.By the computing of the first model formation, integration time constant is for eliminating excitation unit static error, and derivative time constant is for improving the dynamic property of excitation unit.
Preferably, when described test parameter is PSS frequency characteristic parameter in described excitation unit, step S5 comprises following sub-step:
S51c, carry out the second Model Identification calculating according to the parameter of described excitation unit, obtain amplitude versus frequency characte and the phase-frequency characteristic result of calculation of the test link of described PSS frequency characteristic parameter;
S52c, on described field regulator, add reference voltage, described field regulator gathers white noise signal that spectrum analyzer exports and the input signal of test link as described PSS frequency characteristic parameter;
S53c, described white noise signal is carried out 0.1 step-length discrete computing and carry out D/A conversion, output to the output signal of described spectrum analyzer as the test link of described PSS frequency characteristic parameter;
S54c, the amplitude versus frequency characte being measured the output signal of described input signal and described input signal by described spectrum analyzer and phase-frequency characteristic;
Amplitude versus frequency characte and phase-frequency characteristic that S56c, determining step S54c measure and amplitude versus frequency characte described in step S51c and phase-frequency characteristic result of calculation whether consistent, if unanimously, then judge that the PSS frequency characteristic parameter testing in described excitation unit is correct; If inconsistent, then judge the PSS frequency characteristic parameter testing mistake in described excitation unit.Spectrum analyzer can be Aglient35670A spectrum analyzer.
Preferably, the computing formula of described second model is:
In described formula, k
pssfor PSS proportional gain, T
c1for integration time constant, T
b1for integration bandwidth control time constant, T
wfor every straight time constant, k
s2for inertia constant, T
7be the 7th integration time constant, s is differentiating operator.
Preferably, described PSS frequency characteristic parameter comprise gain link parameter, lead-lag link parameter, every straight link parameter, inertial element parameter one or more.Inertial element mainly to input signal have delay, every straight link can unwanted signal filtering, gain link i.e. enlargement factor, lead-lag link from frequency domain angle, full name is phase angular advance, phase delay, a sinusoidal signal is through linear element (system), stable state output is the sinusoidal signal of same frequency, and just amplitude and phase angle change.If the phase angle of output signal is larger than input signal phase angle, then this link has advanced characteristic; Otherwise if the phase angle of output signal is less than input signal phase angle, then this link has hysteresis characteristic.
Implement the static test system of excitation unit of the present invention, there is following beneficial effect: the static test system of the excitation unit provided by the embodiment of the present invention, the various actual parameters of excitation unit can be simulated, no matter be existing excitation unit, or excitation unit newly developed, can complete test to excitation unit by the corresponding analog parameter of input, and do not need to carry out actual test to excitation unit genset is on-the-spot, simple to operate and safety, has saved testing cost.
By reference to the accompanying drawings embodiments of the invention are described above; but the present invention is not limited to above-mentioned embodiment; above-mentioned embodiment is only schematic; instead of it is restrictive; those of ordinary skill in the art is under enlightenment of the present invention; do not departing under the ambit that present inventive concept and claim protect, also can make a lot of form, these all belong within protection of the present invention.
Claims (10)
1. a static test for excitation unit, is characterized in that, comprises the steps:
S1, the silicon controlled power frequency anode voltage of described excitation unit is set;
S2, the given nominal of field regulator in described excitation unit is set to 0, then the feedback voltage of described field regulator is set to 0;
S3, to operation state of generator signal and the tach signal parameter of the input of described field regulator for simulating the state of generator operation under rated speed;
S4, to described excitation unit excitation;
S5, to described field regulator input white noise test signal, measure the test parameter of described excitation unit, and generate corresponding test result according to the test parameter recorded.
2. the static test of excitation unit according to claim 1, is characterized in that, the frequency of operation anode voltage of described excitation unit is lower than rectifier bridge nominal anode voltage.
3. the static test of excitation unit according to claim 1, is characterized in that, the frequency of described white noise signal is 0.1-10HZ.
4. the static test of excitation unit according to claim 1, is characterized in that, described test parameter comprises at least one in D/A voltage parameter in described excitation unit, A/D voltage parameter, PID frequency characteristic parameter, PSS frequency characteristic parameter.
5. the static test of excitation unit according to claim 4, is characterized in that, when described test parameter comprises D/A voltage parameter, A/D voltage parameter in described excitation unit, described step S5 comprises following sub-step:
S51a, to the stator voltage of described field regulator input for simulating the state that described generator works under nominal operation situation;
S52a, by field regulator D/A conversion carried out to described stator voltage and export described D/A voltage;
The voltage circuit of S53a, closed described excitation system, and by field regulator A/D conversion carried out to described stator voltage and export described A/D voltage;
S54a, respectively record described field regulator export D/A, A/D voltage measuring value, complete the test to D/A, A/D voltage parameter in described excitation unit.
6. the static test of excitation unit according to claim 4, is characterized in that, when described test parameter comprises the PID frequency characteristic parameter in described excitation unit, described step S5 comprises following sub-step:
S51b, carry out the first Model Identification calculating according to the parameter of described field regulator, obtain amplitude versus frequency characte and the phase-frequency characteristic result of calculation of the test link of described PID frequency characteristic parameter;
S52b, described field regulator gather the input signal of the white noise signal of spectrum analyzer output the test link as described PID frequency characteristic parameter;
S53b, described white noise signal is carried out 0.1 step-length discrete computing and carry out D/A conversion, output to the output signal of described spectrum analyzer as the test link of described PID frequency characteristic parameter;
S54b, measured amplitude versus frequency characte and the phase-frequency characteristic of described input signal and described output signal by described spectrum analyzer;
Amplitude versus frequency characte and phase-frequency characteristic that S55b, determining step S54b measure and amplitude versus frequency characte described in step S51b and phase-frequency characteristic result of calculation whether consistent, if unanimously, then judge that the PID frequency characteristic parameter testing in described excitation unit is correct; If inconsistent, then judge the PID frequency characteristic parameter testing mistake in described excitation unit.
7. the static test of excitation unit according to claim 6, is characterized in that, the computing formula of described first model is:
In described formula, k
pfor proportional gain, T
c1for integration time constant, T
b1for integration bandwidth control time constant, T
c2for derivative time constant, T
b2for differential bandwidth control time constant, s is differentiating operator.
8. the static test of excitation unit according to claim 4, is characterized in that, when described test parameter comprises the PSS frequency characteristic parameter in described excitation unit, described step S5 comprises following sub-step:
S51c, carry out the second Model Identification calculating according to the parameter of described excitation unit, obtain amplitude versus frequency characte and the phase-frequency characteristic result of calculation of the test link of described PSS frequency characteristic parameter;
S52c, on described field regulator, add reference voltage, described field regulator gathers white noise signal that spectrum analyzer exports and the input signal of test link as described PSS frequency characteristic parameter;
S53c, described white noise signal is carried out 0.1 step-length discrete computing and carry out D/A conversion, output to the output signal of described spectrum analyzer as the test link of described PSS frequency characteristic parameter;
S54c, the amplitude versus frequency characte being measured the output signal of described input signal and described input signal by described spectrum analyzer and phase-frequency characteristic;
Amplitude versus frequency characte and phase-frequency characteristic that S55c, determining step S54c measure and amplitude versus frequency characte described in step S51c and phase-frequency characteristic result of calculation whether consistent, if unanimously, then judge that the PSS frequency characteristic parameter testing in described excitation unit is correct; If inconsistent, then judge the PSS frequency characteristic parameter testing mistake in described excitation unit.
9. the static test of excitation unit according to claim 7, is characterized in that, the computing formula of described second model is:
In described formula, k
pssfor PSS proportional gain, T
c1for integration time constant, T
b1for integration bandwidth control time constant, T
wfor every straight time constant, k
s2for inertia constant, T
7be the 7th integration time constant, s is differentiating operator.
10. the static test of excitation unit according to claim 7, is characterized in that, described PSS frequency characteristic parameter comprises gain link parameter, lead-lag link parameter, at least one in straight link parameter, inertial element parameter.
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| CN105676032A (en) * | 2016-01-30 | 2016-06-15 | 杨明 | Method and system for testing excitation cut-out delay quantity of generator voltage regulator |
| CN115360947A (en) * | 2022-08-31 | 2022-11-18 | 中国长江三峡集团有限公司 | Excitation circuit, excitation small current test method and electronic equipment |
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| CN105676032B (en) * | 2016-01-30 | 2019-01-08 | 佛山中锦微电科技有限公司 | The test method and system of generator voltage controller excitation cutting retardation |
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