CN109521321A - A kind of offset voltage prediction technique that controllable voltage source compensates entirely - Google Patents
A kind of offset voltage prediction technique that controllable voltage source compensates entirely Download PDFInfo
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- CN109521321A CN109521321A CN201910089407.9A CN201910089407A CN109521321A CN 109521321 A CN109521321 A CN 109521321A CN 201910089407 A CN201910089407 A CN 201910089407A CN 109521321 A CN109521321 A CN 109521321A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/088—Aspects of digital computing
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Abstract
This application provides a kind of offset voltage prediction techniques that controllable voltage source compensates entirely, controllable voltage source compensates output valve when fast and accurately can calculate single-phase earthing under the various topological structures that controllable voltage source earth current compensates entirely, calculation method is quick, effective, easy, can be suitable for actual distribution network system well.
Description
Technical field
This application involves the full compensation technique field of power grid single-phase earthing more particularly to a kind of benefits that controllable voltage source compensates entirely
Repay voltage-prediction method.
Background technique
In network system, especially in low and medium voltage distribution network system, singlephase earth fault accounts for the absolute majority of failure sum.
The neutral grounding mode of low and medium voltage distribution network mainly have isolated neutral mode, neutral by arc extinction coil grounding mode or
Neutral point is through low resistance earthing mode.Under isolated neutral mode, earth current is not compensated for and operates with failure,
In the presence of person electric shock risk.Under neutral by arc extinction coil grounding mode, arc suppression coil is grounded in single-phase earthing post-compensation holds stream,
Ground arc can be extinguished, system can operate with failure, but there are still certain ground connection residual flows for grounding point, and there are still person electric shock wind
Danger.Neutral point is through passing through the route zero-sequenceprotection tripping ground path of protective relaying device, power supply under low resistance earthing mode
Reliability cannot ensure.The earth current of network system compensates entirely, can be in single-phase earthing, by grounding point current compensation to pole
Small value, system can still operate with failure, and eliminate the personal Danger Electric shock risk of grounding point, but the compensation that existing electric current compensates entirely
Voltage determines method complexity, is difficult to apply to actual distribution network system.
Summary of the invention
It is complete to solve existing electric current this application provides a kind of offset voltage prediction technique that controllable voltage source compensates entirely
The problem of offset voltage of compensation determines method complexity, is difficult to apply to actual distribution network system.
This application provides a kind of offset voltage prediction technique that controllable voltage source compensates entirely, it is applied to use controllable voltage
The determination of the source progress full offset voltage of distribution net work earthing fault, which comprises
The phase angle and amplitude of the initial voltage of three-phase voltage are obtained, the initial voltage is that ground fault does not occur mutually for target
Voltage；
The difference for calculating the phase angle of the phase angle of the initial voltage of target phase and the initial voltage of remaining two-phase, obtains the first phase
Angular difference value and the second phase angle difference, the target are mutually any phase in three phase mains；
According to the first phase angle difference and the second phase angle difference, the absolute value and second of the first phase angle difference is calculated
The difference of the absolute value of phase angle difference obtains third phase angle difference value；
The controllable voltage source output initial detecting voltage is controlled, and obtains the voltage magnitude and phase of initial detecting voltage
Angle；
According to preset adjusting step-length, the phase of the initial detecting voltage is adjusted, measures the voltage phase of corresponding three-phase
Angle；
The difference for calculating separately the voltage phase angle of the voltage phase angle of the target phase measured and remaining two-phase of measurement, obtains
To the 4th phase angle difference and the 5th phase angle difference；
According to the 4th phase angle difference and the 5th phase angle difference, the absolute value and the 5th of the 4th phase angle difference is calculated
The difference of the absolute value of phase angle difference obtains the 6th phase angle difference；
Judge whether the absolute value of the 6th phase angle difference is less than the absolute value of third phase angular difference value, if so,
According to adjustment obtain controllable voltage source detection voltage phase angle and target phase initial voltage phase angle and voltage magnitude,
The voltage magnitude and phase angle of the offset voltage of controllable voltage source is calculated；If it is not, then jumping to adjustment initial detecting voltage
The step of phase.
Further, the preset formula is
Wherein, UphFor the voltage magnitude of the initial voltage of target phase,For the detection electricity for adjusting obtained controllable voltage source
The phase angle of pressure,For the phase angle of the initial voltage of target phase, Ucom is the voltage magnitude of the offset voltage of controllable voltage source, ∠
Ucom is the phase angle of the offset voltage of controllable voltage source.
Further, the preset adjusting step-length is between 0.01 ° -0.5 °.
Further, the frequency of the initial detecting voltage is 50Hz, voltage magnitude 100V-1000V.
Further, the controllable voltage source is parallel with arc suppression coil.
From the above technical scheme, this application provides a kind of offset voltage prediction sides that controllable voltage source compensates entirely
Method, it is controllable when fast and accurately can calculate single-phase earthing under the various topological structures that controllable voltage source earth current compensates entirely
Voltage source compensates output valve, and calculation method is quick, effective, easy, can be suitable for actual distribution network system well.
Detailed description of the invention
In order to illustrate more clearly of the technical solution of the application, letter will be made to attached drawing needed in the embodiment below
Singly introduce, it should be apparent that, for those of ordinary skills, without any creative labor,
It is also possible to obtain other drawings based on these drawings.
Fig. 1 is the circuit diagram for one embodiment of compensation circuit that the controllable voltage source of the application application compensates entirely；
Fig. 2 is the circuit diagram for another embodiment of compensation circuit that the controllable voltage source of the application application compensates entirely；
Fig. 3 is a kind of flow chart for the offset voltage prediction technique that controllable voltage source compensates entirely provided by the present application.
Specific embodiment
Referring to Fig. 1, this application provides a kind of offset voltage prediction techniques that controllable voltage source compensates entirely, are applied to application
In the determination for carrying out the full offset voltage of distribution net work earthing fault using controllable voltage source, physical circuit includes controllable voltage source, becomes
Depressor and three phase mains, the controllable voltage source are connect by transformer with three phase mains.Preferably, controllable voltage source is parallel with
Arc suppression coil, physical circuit can be found in Fig. 2, wherein UA、UBAnd UCFor A, B and C phase of three-phase voltage.
Referring to Fig. 3, another embodiment of the application is based on foregoing circuit, provides the compensation electricity that controllable voltage source compensates entirely
Pressure prediction method, includes the following steps:
Step 31: obtaining the phase angle and amplitude of the initial voltage of three-phase voltage, the initial voltage is that target does not occur mutually
The voltage of ground fault.
Step 32: calculating the difference of the phase angle of the phase angle of the initial voltage of target phase and the initial voltage of remaining two-phase, obtain
To the first phase angle difference and the second phase angle difference, the target is mutually any phase in three phase mains.
Step 33: according to the first phase angle difference and the second phase angle difference, calculating the absolute of the first phase angle difference
The difference of value and the absolute value of the second phase angle difference, obtains third phase angle difference value.
Step 34: controlling the controllable voltage source output initial detecting voltage, and obtain the voltage amplitude of initial detecting voltage
Value and phase angle.The frequency of initial detecting voltage is 50Hz, voltage magnitude 100V-1000V.
Step 35: according to preset adjusting step-length, adjusting the phase of the initial detecting voltage, measure corresponding three-phase
Voltage phase angle.Specifically, preset adjusting step-length is between 0.01 ° -0.5 °.
Step 36: calculating separately the voltage phase angle of the voltage phase angle of the target phase measured and remaining two-phase of measurement
Difference obtains the 4th phase angle difference and the 5th phase angle difference.
Step 37: according to the 4th phase angle difference and the 5th phase angle difference, calculating the absolute of the 4th phase angle difference
The difference of value and the absolute value of the 5th phase angle difference, obtains the 6th phase angle difference.
Step 38: judge whether the absolute value of the 6th phase angle difference is less than the absolute value of third phase angular difference value,
If so, thening follow the steps 39；If it is not, going to step 35.
Step 39: according to the initial voltage for the phase angle for detecting voltage and target phase for adjusting obtained controllable voltage source
The voltage magnitude and phase angle of the offset voltage of controllable voltage source is calculated in phase angle and voltage magnitude.
Specifically, preset formula is
Wherein, UphFor the voltage magnitude of the initial voltage of target phase,For the detection electricity for adjusting obtained controllable voltage source
The phase angle of pressure,For the phase angle of the initial voltage of target phase, Ucom is the voltage magnitude of the offset voltage of controllable voltage source,
∠ Ucom is the phase angle of the offset voltage of controllable voltage source.
From the above technical scheme, this application provides a kind of offset voltage prediction sides that controllable voltage source compensates entirely
Method, it is controllable when fast and accurately can calculate single-phase earthing under the various topological structures that controllable voltage source earth current compensates entirely
Voltage source compensates output valve, and calculation method is quick, effective, easy, can be suitable for actual distribution network system well.
Claims (5)
1. a kind of offset voltage prediction technique that controllable voltage source compensates entirely connects applied to power distribution network is carried out using controllable voltage source
The determination of the full offset voltage of earth fault, which is characterized in that the described method includes:
The phase angle and amplitude of the initial voltage of three-phase voltage are obtained, the initial voltage is the electricity that ground fault does not occur mutually for target
Pressure；
The difference for calculating the phase angle of the phase angle of the initial voltage of target phase and the initial voltage of remaining two-phase, obtains the first phase angle difference
Value and the second phase angle difference, the target is mutually any phase in three phase mains；
According to the first phase angle difference and the second phase angle difference, the absolute value and the second phase angle of the first phase angle difference are calculated
The difference of the absolute value of difference obtains third phase angle difference value；
The controllable voltage source output initial detecting voltage is controlled, and obtains the voltage magnitude and phase angle of initial detecting voltage；
According to preset adjusting step-length, the phase of the initial detecting voltage is adjusted, the voltage phase angle of corresponding three-phase is measured；
The difference for calculating separately the voltage phase angle of the voltage phase angle of the target phase measured and remaining two-phase of measurement, obtains the
Four phase angle differences and the 5th phase angle difference；
According to the 4th phase angle difference and the 5th phase angle difference, the absolute value and the 5th phase angle of the 4th phase angle difference are calculated
The difference of the absolute value of difference obtains the 6th phase angle difference；
Judge whether the absolute value of the 6th phase angle difference is less than the absolute value of third phase angular difference value, if so, according to
The phase angle and voltage magnitude for adjusting the phase angle of the detection voltage of obtained controllable voltage source and the initial voltage of target phase, calculate
Obtain the voltage magnitude and phase angle of the offset voltage of controllable voltage source；If it is not, then jumping to the phase of adjustment initial detecting voltage
The step of.
2. the method as described in claim 1, which is characterized in that the preset formula is
Wherein, UphFor the voltage magnitude of the initial voltage of target phase,For the detection voltage for adjusting obtained controllable voltage source
Phase angle,For the phase angle of the initial voltage of target phase, Ucom is the voltage magnitude of the offset voltage of controllable voltage source, ∠
Ucom is the phase angle of the offset voltage of controllable voltage source.
3. the method as described in claim 1, which is characterized in that the preset adjusting step-length is between 0.01 ° -0.5 °.
4. the method as described in claim 1, which is characterized in that the frequency of the initial detecting voltage is 50Hz, voltage magnitude
For 100V-1000V.
5. the method as described in claim 1, which is characterized in that the controllable voltage source is parallel with arc suppression coil.
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Cited By (1)
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| CN109782114A (en) * | 2019-03-29 | 2019-05-21 | 云南电网有限责任公司电力科学研究院 | A kind of full compensation of ground malfunction method of discrimination of controllable voltage source and system |
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