CN108508276A - Power frequency amount parameter test method - Google Patents
Power frequency amount parameter test method Download PDFInfo
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- CN108508276A CN108508276A CN201710105325.XA CN201710105325A CN108508276A CN 108508276 A CN108508276 A CN 108508276A CN 201710105325 A CN201710105325 A CN 201710105325A CN 108508276 A CN108508276 A CN 108508276A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
- G01R27/2605—Measuring capacitance
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
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- General Physics & Mathematics (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Abstract
The present invention relates to power frequency amount parameter test methods, belong to power frequency field of measuring technique；By applying, frequency conversion is single-phase or three-phase alternating-current supply avoids system frequency, by the frequency departure power frequency 50Hz of the measuring signal of measuring device, then traditional interference has reformed into alien frequencies interference, just available filtering method is eliminated, filtering technique is used to eliminate influence of the induced voltage electric current to measurement accuracy caused by neighbouring alive circuit, to the voltage of electric system difference node, current signal is sampled, then fundamental phasors calculating is carried out to sampled value using full discrete Fourier algorithm, since the sampling at both ends is synchronous carries out, the calculated fundamental phasors in both ends will be with unified reference data, it directly can be compared or participate in operation.The normal power supply of load and the Optimum distribution of trend are not influenced, and measuring apparatus is light easy to operate；Based on the synchronously sampled data of its measurement, it can provide circuit positive order parameter at any time, be not required to have a power failure, not influence the normal operation of system.
Description
Technical field
The present invention relates to power frequency amount parameter test methods, belong to power frequency technical field of measurement and test.
Background technology
Power frequency:Refer to the frequency of AC power industrially, unit hertz (Hz).
Power frequency amount parameter, including positive sequence impedance, zero sequence impedance, positive sequence capacitance and zero sequence capacitance etc., for what is joint used
Multiloop or closer, the longer circuit of parallel-segment of distance, also need to measure coupled capacitor and mutual inductive impedance.
With the increase of net capacity, the raising of voltage class, the growth of transmission line length and the increase of mutual inductance circuit,
Original off-line measurement method and measurement means have been difficult to meet the requirement of new power transmission line power frequency amount actual measurement.
Instrument method is traditional line parameter circuit value measurement method, is measured to have a power failure, i.e. institute's survey line road must have a power failure, and be detached from electricity
Net, and the positive sequence of circuit, Zero sequence parameter are measured by different measurement experiments.By applying experiment power supply to circuit,
Each state that circuit is measured using the various meters such as voltmeter, ammeter, power meter, frequency meter, through manually reading tabular value
Afterwards using corresponding formula calculate each corresponding line parameter circuit value come.The method of this measurement is due to eliminating in practice each
The influence, such as geological conditions, weather, temperature etc. of kind uncertain factor, therefore ratio only relies on the parameter value that theoretical calculation obtains
It is accurate.But the measurement of power failure not only influences the Optimum distribution of normal load power supply and trend, uses one side of these instrument
Face reading is less accurate, and on the other hand each parameter needs a set of mode of connection, also has measuring apparatus heavy, cumbersome,
The drawbacks such as time-consuming and laborious, more before measuring after circuit cut-off, ground connection be closed and measurement process in all multioperations in there are works
Make the security risk of personnel and electrical equipment；It, can generally by wireless link between circuit both ends and scheduling in especially measuring
It is poor by property, easily cause the error in terms of cooperation.If the harmonic content in measuring signal is higher, it can influence to measure
Accuracy.
Invention content
In view of the defects and deficiencies of the prior art, the present invention intends to provide a kind of simple in structure, reasonable design makes
With convenient power frequency amount parameter test method.
To achieve the above object, the technical solution adopted by the present invention is：It is comprised the steps of：
1, the line parameter circuit value test of Frequency Conversion Theory
It is single-phase or three-phase alternating-current supply avoids system frequency by applying frequency conversion, by the frequency of the measuring signal of measuring device
Deviate power frequency 50Hz, then traditional interference has reformed into alien frequencies interference, so that it may be eliminated, i.e., disappeared using filtering technique with filtering method
Except influence of the induced voltage electric current to measurement accuracy caused by neighbouring alive circuit, in addition, reasonably selecting the frequency of measuring signal
Bias can eliminate alive circuit and interfere measuring the alien frequencies generated；
2, in the parameter of synchronous phasor measurement in line computation
Under conditions of known line both ends synchronizing voltage and electric current, each order parameter of circuit is acquired by calculating；
3, synchronous phasor measurement
According to the relationship of the WAMS circuit both ends synchronizing voltages and electric current phasor and line parameter circuit value provided, you can easily count
Calculate the various parameters of power frequency；Voltage, the current signal of electric system difference node are sampled, discrete Fu of week is then utilized
Family name's algorithm carries out fundamental phasors calculating to sampled value, since the sampling at both ends is synchronous progress, the calculated fundamental wave phase in both ends
Amount directly can be compared or participate in operation by with unified reference data；
4, power frequency parameter is calculated using asymmetric method of addition, may not only be applied to no mutual inductance circuit, can also be applied to by mutual
The circuit of sense effect；
5, the parameter in the case of On-line Estimation open-phase operation, using the phase-deficient operation situation occurred in area to circuit just,
Negative, Zero sequence parameter and line length are carried out at the same time estimation.
6, the mutual inductance circuit zero ordinal parameter live line measurement based on GPS, wherein the live line measurement can measure mutual electricity simultaneously
Resistance and mutual reactance, and conventional method cannot measure mutual resistance, it is prior that difference lies in conventional methods to be only used for the survey that has a power failure
Amount, and live line measurement method can be not only used for having a power failure and measure, it can also be used to live line measurement；Meanwhile it can be led to using the measuring system
The measurement for crossing fewer number obtains the zero sequence autoregressive parameter of mutual inductance circuit and mutual parameter, and greatly reduces caused by the measurement that has a power failure
Loss.
Further：The line parameter circuit value test of Frequency Conversion Theory, is first connected to measuring apparatus on circuit, measures line in step 1
The frequency and amplitude of road interference, determine the maximum frequency of noise amplitudes, reset and wait for measured frequency, and setting is generated by variable-frequency power sources
The measurement voltage of frequency is applied to circuit to be measured, and then acquisition signal is sent to host computer by analog filtering, and as needed
Digital filtering is carried out, the power frequency parameter of 50Hz is can be obtained finally by calculating；
In general, even if not additional zero-sequence current source, also due to load is uneven in the circuit of heavy current grounding system
It weighs and zero-sequence current and residual voltage occurs；In order to be excluded in the measurements due to unborn zero-sequence current, residual voltage
Influence to measurement result, therefore propose method of addition.
With the above structure, the present invention has the beneficial effect that：Power frequency amount parameter test method of the present invention, technique letter
It is single, the normal power supply of load and the Optimum distribution of trend are not influenced, and measuring apparatus is light easy to operate；Synchronization based on its measurement
Sampled data can provide circuit positive order parameter at any time, near the larger or institute's survey line road of load unbalanced degree, not include institute's survey line
Road, when unbalanced fault occurs, measuring system starts automatically calculates circuit Zero sequence parameter, is not required to have a power failure, is not influencing system just
Often operation.
Specific implementation mode
Present embodiment comprises the steps of：
1, the line parameter circuit value test of Frequency Conversion Theory
It is single-phase or three-phase alternating-current supply avoids system frequency by applying frequency conversion, by the frequency of the measuring signal of measuring device
Deviate power frequency 50Hz, then traditional interference has reformed into alien frequencies interference, so that it may be eliminated, i.e., disappeared using filtering technique with filtering method
Except influence of the induced voltage electric current to measurement accuracy caused by neighbouring alive circuit, in addition, reasonably selecting the frequency of measuring signal
Bias can eliminate alive circuit and interfere measuring the alien frequencies generated；
First measuring apparatus is connected on circuit, the frequency and amplitude of line-hit is measured, determines the maximum frequency of noise amplitudes
Rate resets and waits for measured frequency, and the measurement voltage that setpoint frequency is generated by variable-frequency power sources is applied to circuit to be measured, then passes through mould
Quasi- filtering send acquisition signal to host computer, and carries out digital filtering as needed, can be obtained 50Hz's finally by calculating
Power frequency parameter；
2, in the parameter of synchronous phasor measurement in line computation
Under conditions of known line both ends synchronizing voltage and electric current, each order parameter of circuit is acquired by calculating；
3, synchronous phasor measurement
According to the relationship of the WAMS circuit both ends synchronizing voltages and electric current phasor and line parameter circuit value provided, you can easily count
Calculate the various parameters of power frequency；Voltage, the current signal of electric system difference node are sampled, discrete Fu of week is then utilized
Family name's algorithm carries out fundamental phasors calculating to sampled value, since the sampling at both ends is synchronous progress, the calculated fundamental wave phase in both ends
Amount directly can be compared or participate in operation by with unified reference data；
4, power frequency parameter is calculated using asymmetric method of addition, may not only be applied to no mutual inductance circuit, can also be applied to by mutual
The circuit of sense effect；
5, the parameter in the case of On-line Estimation open-phase operation, using the phase-deficient operation situation occurred in area to circuit just,
Negative, Zero sequence parameter and line length are carried out at the same time estimation.
6, the mutual inductance circuit zero ordinal parameter live line measurement based on GPS, wherein the live line measurement can measure mutual electricity simultaneously
Resistance and mutual reactance, and conventional method cannot measure mutual resistance, it is prior that difference lies in conventional methods to be only used for the survey that has a power failure
Amount, and live line measurement method can be not only used for having a power failure and measure, it can also be used to live line measurement；Meanwhile it can be led to using the measuring system
The measurement for crossing fewer number obtains the zero sequence autoregressive parameter of mutual inductance circuit and mutual parameter, and greatly reduces caused by the measurement that has a power failure
Loss.
In general, even if not additional zero-sequence current source, also due to load is uneven in the circuit of heavy current grounding system
It weighs and zero-sequence current and residual voltage occurs；In order to be excluded in the measurements due to unborn zero-sequence current, residual voltage
Influence to measurement result, therefore propose method of addition.
With the above structure, present embodiment has the beneficial effect that：Power frequency amount ginseng described in present embodiment
Number test method, it is simple for process, the normal power supply of load and the Optimum distribution of trend, the light operation letter of measuring apparatus are not influenced
It is single；Based on the synchronously sampled data of its measurement, it can provide circuit positive order parameter at any time, in the larger or institute's survey line of load unbalanced degree
Near road, institute's survey line road is not included, when unbalanced fault occurs, measuring system starts automatically calculates circuit Zero sequence parameter, is not required to
Have a power failure, does not influence the normal operation of system.
The above is merely illustrative of the technical solution of the present invention and unrestricted, and those of ordinary skill in the art are to this hair
The other modifications or equivalent replacement that bright technical solution is made, as long as it does not depart from the spirit and scope of the technical scheme of the present invention,
It is intended to be within the scope of the claims of the invention.
Claims (2)
1. power frequency amount parameter test method, it is characterised in that：It is comprised the steps of：
(1), the line parameter circuit value test of Frequency Conversion Theory
It is single-phase or three-phase alternating-current supply avoids system frequency by applying frequency conversion, by the frequency departure of the measuring signal of measuring device
Power frequency 50Hz, then traditional interference have reformed into alien frequencies interference, so that it may be eliminated with filtering method, that is, use filtering technique to eliminate adjacent
Influence of the induced voltage electric current to measurement accuracy caused by nearly alive circuit, in addition, reasonably selecting the frequency departure of measuring signal
Amount can eliminate alive circuit and interfere measuring the alien frequencies generated；
(2), in the parameter of synchronous phasor measurement in line computation
Under conditions of known line both ends synchronizing voltage and electric current, each order parameter of circuit is acquired by calculating；
(3), synchronous phasor measurement
According to the relationship of the WAMS circuit both ends synchronizing voltages and electric current phasor and line parameter circuit value provided, you can easily calculate work
The various parameters of frequency；Voltage, the current signal of electric system difference node are sampled, then calculated using full discrete Fourier
Method carries out fundamental phasors calculating to sampled value, and since the sampling at both ends is synchronous progress, the calculated fundamental phasors in both ends will
With unified reference data, operation directly can be compared or participated in；
(4), power frequency parameter is calculated using asymmetric method of addition, may not only be applied to no mutual inductance circuit, can also be applied to by mutual inductance
The circuit of effect；
(5), the parameter in the case of On-line Estimation open-phase operation, positive and negative to circuit using the phase-deficient operation situation occurred in area,
Zero sequence parameter and line length are carried out at the same time estimation；
(6), the mutual inductance circuit zero ordinal parameter live line measurement based on GPS, wherein the live line measurement can measure mutual resistance simultaneously
And mutual reactance, and conventional method cannot measure mutual resistance, it is prior to be only used for the measurement that has a power failure difference lies in conventional method,
And live line measurement method can be not only used for having a power failure and measure, it can also be used to live line measurement；Meanwhile using the measuring system can by compared with
The measurement of few number obtains the zero sequence autoregressive parameter of mutual inductance circuit and mutual parameter, and greatly reduces because of the damage caused by measuring that has a power failure
It loses.
2. power frequency amount parameter test method according to claim 1, it is characterised in that：The circuit of Frequency Conversion Theory in step 1
Parameter testing is first connected to measuring apparatus on circuit, measures the frequency and amplitude of line-hit, determine the maximum frequency of noise amplitudes
Rate resets and waits for measured frequency, and the measurement voltage that setpoint frequency is generated by variable-frequency power sources is applied to circuit to be measured, then passes through mould
Quasi- filtering send acquisition signal to host computer, and carries out digital filtering as needed, can be obtained 50Hz's finally by calculating
Power frequency parameter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710105325.XA CN108508276A (en) | 2017-02-26 | 2017-02-26 | Power frequency amount parameter test method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710105325.XA CN108508276A (en) | 2017-02-26 | 2017-02-26 | Power frequency amount parameter test method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108508276A true CN108508276A (en) | 2018-09-07 |
Family
ID=63373957
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710105325.XA Withdrawn CN108508276A (en) | 2017-02-26 | 2017-02-26 | Power frequency amount parameter test method |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101696993A (en) * | 2009-10-23 | 2010-04-21 | 武汉大学 | Method for electrically measuring zero sequence impedance parameter by mutual induction line of pilot frequency injection current |
| CN103399209A (en) * | 2013-08-22 | 2013-11-20 | 武汉大学 | Method for measuring power frequency parameters of ultra-high voltage bipolar direct current (DC) transmission line |
-
2017
- 2017-02-26 CN CN201710105325.XA patent/CN108508276A/en not_active Withdrawn
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101696993A (en) * | 2009-10-23 | 2010-04-21 | 武汉大学 | Method for electrically measuring zero sequence impedance parameter by mutual induction line of pilot frequency injection current |
| CN103399209A (en) * | 2013-08-22 | 2013-11-20 | 武汉大学 | Method for measuring power frequency parameters of ultra-high voltage bipolar direct current (DC) transmission line |
Non-Patent Citations (1)
| Title |
|---|
| 于涛 等: "输电线路工频量参数测试方法综述", 《机电工程技术》 * |
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Application publication date: 20180907 |