CN110311380A - A kind of active ground compensation device control method - Google Patents
A kind of active ground compensation device control method Download PDFInfo
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- CN110311380A CN110311380A CN201910654301.9A CN201910654301A CN110311380A CN 110311380 A CN110311380 A CN 110311380A CN 201910654301 A CN201910654301 A CN 201910654301A CN 110311380 A CN110311380 A CN 110311380A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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Abstract
The embodiment of the present application provides a kind of active ground compensation device control method, comprising: computing system distribution capacity and system earth transition resistance when single-phase earthing over the ground；According to system earth transition resistance and system, distribution capacity calculates fisrt feature parameter over the ground；Judge whether fisrt feature parameter is greater than or equal to preset threshold；If fisrt feature parameter is greater than or equal to preset threshold, voltage source mode is set by active ground compensation device；If fisrt feature parameter is less than preset threshold, current source mode is set by active ground compensation device.The application can select suitable voltage source or current source to carry out active compensation to system according to current system conditions, be conducive to improve compensation control effect.
Description
Technical field
This application involves network system single-phase active compensation technique fields more particularly to a kind of active ground compensation device to control
Method.
Background technique
In power distribution network, singlephase earth fault is the highest system failure of probability of happening.When singlephase earth fault occurs,
It will lead to the problems such as arc overvoltage, grounding surge, grounding point electric arc cannot extinguish, risk of getting an electric shock is high.Arc suppression coil can be put out
Go out ground arc, cooperates relay protection that can realize quickly isolating for ground fault, but above-mentioned solution using low resistance grounding mode
Mode cannot take into account power supply reliability and personal safety this to intrinsic contradictions.
In the related technology, by active ground compensation device, property point applies offset voltage or injecting compensating electric current in systems,
It can be realized full remuneration earth current, achieve the effect that extinguish ground arc, make distribution network system that can operate with failure, simultaneously
Ground is lower, and electric shock accidents probability of happening is greatly reduced, and can effectively solve the problem that power supply reliability and personal safety contradiction.
When active ground compensation device runs on voltage source mode, exportable offset voltage, when active compensator is run on
When current source mode, exportable compensation electric current, however, active ground compensation device runs on voltage source mode and current source mode is equal
Respectively have disadvantage, for example, when active ground compensation device runs on voltage source mode, voltage-source type active compensator output voltage it is micro-
Minor swing will result in control deviation, cause significantling change for grounding point residual flow；And when active ground compensation device runs on electric current
When source module, when impedance loop is larger, output current control is more difficult.
Summary of the invention
This application provides a kind of active ground compensation device control methods, difficult to solve existing active ground compensation device control
Spend big problem.
This application provides a kind of active ground compensation device control methods, this method comprises:
Computing system distribution capacity and system earth transition resistance when single-phase earthing over the ground；
According to the system earth transition resistance and system, distribution capacity calculates fisrt feature parameter over the ground；
Judge whether the fisrt feature parameter is greater than or equal to preset threshold；
If the fisrt feature parameter is greater than or equal to the preset threshold, set the active ground compensation device to
Voltage source mode；
If the fisrt feature parameter is less than the preset threshold, current source is set by the active ground compensation device
Mode.
Optionally, which is characterized in that the preset threshold includes 0.3.
Optionally, according to the system earth transition resistance, system, distribution capacity calculates fisrt feature parameter, packet over the ground
It includes: when the active ground compensation device is without compensation inductance, according toFisrt feature parameter is calculated,
In, δ is the fisrt feature parameter, RdFor the system earth transition resistance, ω is system voltage angular frequency, and C is the system
System distribution capacity over the ground.
Optionally, according to the system earth transition resistance, system, distribution capacity calculates fisrt feature parameter, packet over the ground
It includes: when the active ground compensation device contains compensation inductance, according toCalculate fisrt feature ginseng
Number, wherein δ is the fisrt feature parameter, RdFor the system earth transition resistance, ω is system voltage angular frequency, and L is institute
The induction reactance value of compensation inductance is stated, C is system distribution capacity over the ground.
Optionally, the method also includes:
According to active ground compensation device work in voltage source mode, is exported and compensated using the active ground compensation device
Voltage is to system neutral, wherein the offset voltage is the reverse phase electricity of Earth Phase phase voltage before singlephase earth fault occurs
Pressure.
Optionally, the method also includes:
According to active ground compensation device work in current source mode, is exported and compensated using the active ground compensation device
Electric current is to system neutral, wherein when the active ground compensation device contains compensation inductance, according toIt calculates
The compensation electric current is obtained, when the active ground compensation device is without containing compensation inductance, according toIt calculates
Obtain the compensation electric current, ICOMForThe phase voltage for being Earth Phase before being grounded, ω are system voltage angular frequency, and L is
The induction reactance value of the compensation inductance, C are system distribution capacity over the ground.
The beneficial effect of active ground compensation device control method provided by the present application includes:
Active ground compensation device control method provided by the embodiments of the present application distribution capacity and single-phase connects over the ground according to system
System earth transition resistance when ground, is calculated fisrt feature parameter, according to fisrt feature parameter in first threshold range,
Voltage source mode is set by active ground compensation device, according to fisrt feature parameter within the scope of second threshold, by active ground connection
Compensator is set as current source mode, enables active ground compensation device according to current system mode, selects suitable electricity
Potential source or current source carry out active compensation to system, are conducive to improve compensation control effect.
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 a kind of flow diagram of active ground compensation device control method provided by the embodiments of the present application.
Specific embodiment
In order to make those skilled in the art better understand the technical solutions in the application, below in conjunction with the application reality
The attached drawing in example is applied, the technical scheme in the embodiment of the application is clearly and completely described, it is clear that described implementation
Example is only some embodiments of the present application, rather than whole embodiments.Based on the embodiment in the application, the common skill in this field
The application protection all should belong in art personnel every other embodiment obtained without making creative work
Range.
It is a kind of flow diagram of active ground compensation device control method provided by the embodiments of the present application, such as referring to Fig. 1
Shown in Fig. 1, active ground compensation device control method provided by the embodiments of the present application, comprising the following steps:
Step S110: computing system distribution capacity and system earth transition resistance when single-phase earthing over the ground.
In the present embodiment, distribution capacity and system earth transition resistance when single-phase earthing use existing routine to system over the ground
Method calculates.
Step S120: according to system earth transition resistance and system, distribution capacity calculates fisrt feature parameter over the ground.
The active ground compensation device that the embodiment of the present application uses is divided into two kinds, and one is the active ground connection containing compensation inductance
Compensator, one is without containing compensation inductance active compensator, it is subsequent calculating also according to the difference of active ground compensation device and
It is slightly different.
When active ground compensation device is without compensation inductance, fisrt feature parameter is calculated according to the following formula:
(1) in formula, δ is fisrt feature parameter, RdFor system earth transition resistance, ω is system voltage angular frequency, and C is to be
System distribution capacity over the ground.
When active ground compensation device contains compensation inductance, fisrt feature parameter is calculated according to the following formula:
(2) in formula, δ is fisrt feature parameter, RdFor system earth transition resistance, ω is system voltage angular frequency, and L is to mend
The induction reactance value of inductance is repaid, C is system distribution capacity over the ground.
Step S130: judge whether fisrt feature parameter is greater than or equal to preset threshold.
In the embodiment of the present application, preset threshold 0.3.According to (1) formula or (2) formula, the value range of fisrt feature parameter
It is 0~1, the preset threshold of the embodiment of the present application setting is 0.3, is by emulating an obtained preferred values, setting is default
Threshold value is 0.3, and the value range of fisrt feature parameter has been divided into two ranges, and one is [0.3,1], is denoted as first threshold
Range, the other is [0,0.3), be denoted as second threshold range be [0,0.3).
Judge whether fisrt feature parameter is greater than or equal to preset threshold, that is, judges that the first characterisitic parameter is to belong to the first threshold
Value range still falls within second threshold range.
Step S140: if fisrt feature parameter is greater than or equal to preset threshold, electricity is set by active ground compensation device
Source mode.
If fisrt feature parameter belongs to first threshold range, voltage source mode is set by active ground compensation device.
Step S150: it according to the work of active ground compensation device in voltage source mode, is exported and is mended using active ground compensation device
Voltage is repaid to system neutral.
When the work of active ground compensation device is at voltage source mode (or be voltage-tracing mode), pass through active ground connection benefit
It repays device and exports offset voltage to system neutral, wherein offset voltage is Earth Phase phase voltage before singlephase earth fault occurs
Reverse voltage, phase voltage can pass through voltage transformer and measurement module measurement obtain.
Step S160: if fisrt feature parameter is less than preset threshold, current source mould is set by active ground compensation device
Formula.
If fisrt feature parameter belongs to second threshold range, current source mode is set by active ground compensation device.
Step S170: it according to the work of active ground compensation device in current source mode, is exported and is mended using active ground compensation device
Electric current is repaid to system neutral.
When the work of active ground compensation device is at current source mode (or be current tracking mode), pass through active ground connection benefit
Device output compensation electric current is repaid to system neutral, wherein the calculation method for compensating electric current is as follows:
When active ground compensation device is without containing compensation inductance, fisrt feature parameter is calculated according to the following formula:
(3) in formula, ICOMForThe phase voltage for being Earth Phase before being grounded, ω are system voltage angular frequency, and C is to be
System distribution capacity over the ground.
When active ground compensation device contains compensation inductance, fisrt feature parameter is calculated according to the following formula:
(4) in formula, ICOMForThe phase voltage for being Earth Phase before being grounded, ω are system voltage angular frequency, and L is to mend
The induction reactance value of inductance is repaid, C is system distribution capacity over the ground.
As seen from the above-described embodiment, active ground compensation device control method provided by the embodiments of the present application, according to system pair
System earth transition resistance when ground distribution capacity and single-phase earthing, is calculated fisrt feature parameter, is joined according to fisrt feature
Number sets voltage source mode for active ground compensation device, according to fisrt feature parameter in the second threshold in first threshold range
It is worth in range, sets current source mode for active ground compensation device, enables the active ground compensation device to be according to current
System state selects suitable voltage source or current source to carry out active compensation to system, is conducive to the precision for improving compensation, and reduction has
Source compensation control difficulty, improves compensation control effect.
Since embodiment of above is that reference combination is illustrated on other modes, have between different embodiments
There is identical part, identical, similar part may refer to each other between each embodiment in this specification.Herein no longer in detail
It illustrates.
It should be noted that in the present specification, the relational terms of such as " first " and " second " or the like are used merely to
It distinguishes one entity or operation from another entity or operation, and not necessarily requires or imply these entities or operation
Between there are any this actual relationship or sequences.Moreover, the terms "include", "comprise" or its any other variant are intended to
Cover non-exclusive inclusion, so that the circuit structure, article or the equipment that include a series of elements not only include those
Element, but also including other elements that are not explicitly listed, or further include for this circuit structure, article or equipment
Intrinsic element.In the absence of more restrictions, the element for thering is sentence "including a ..." to limit, it is not excluded that
There is also other identical elements in circuit structure, article or equipment including the element.
Those skilled in the art will readily occur to its of the application after considering specification and practicing the disclosure invented here
His embodiment.This application is intended to cover any variations, uses, or adaptations of the invention, these modifications, purposes or
Person's adaptive change follows the general principle of the application and including the undocumented common knowledge in the art of the application
Or conventional techniques.The description and examples are only to be considered as illustrative, and the true scope and spirit of the application are wanted by right
The content asked is pointed out.
Above-described the application embodiment does not constitute the restriction to the application protection scope.
Claims (6)
1. a kind of active ground compensation device control method characterized by comprising
Computing system distribution capacity and system earth transition resistance when single-phase earthing over the ground；
According to the system earth transition resistance and system, distribution capacity calculates fisrt feature parameter over the ground；
Judge whether the fisrt feature parameter is greater than or equal to preset threshold；
If the fisrt feature parameter is greater than or equal to the preset threshold, voltage is set by the active ground compensation device
Source module；
If the fisrt feature parameter is less than the preset threshold, current source mould is set by the active ground compensation device
Formula.
2. active ground compensation device control method as described in claim 1, which is characterized in that the preset threshold includes 0.3.
3. active ground compensation device control method as described in claim 1, which is characterized in that according to the system earth transition
Distribution capacity calculates fisrt feature parameter over the ground for resistance, system, comprising: when the active ground compensation device is without compensation inductance
When, according toCalculate fisrt feature parameter, wherein δ is the fisrt feature parameter, RdIt is connect for the system
Ground transition resistance, ω are system voltage angular frequency, and C is system distribution capacity over the ground.
4. active ground compensation device control method as described in claim 1, which is characterized in that according to the system earth transition
Distribution capacity calculates fisrt feature parameter over the ground for resistance, system, comprising: when the active ground compensation device contains compensation inductance
When, according toCalculate fisrt feature parameter, wherein δ is the fisrt feature parameter, RdIt is described
System earth transition resistance, ω are system voltage angular frequency, and L is the induction reactance value of the compensation inductance, and C is that the system is divided over the ground
Cloth capacitor.
5. active ground compensation device control method as described in claim 1, which is characterized in that the method also includes:
According to active ground compensation device work in voltage source mode, offset voltage is exported using the active ground compensation device
To system neutral, wherein the offset voltage is the reverse voltage of Earth Phase phase voltage before singlephase earth fault occurs.
6. active ground compensation device control method as described in claim 1, which is characterized in that the method also includes:
According to active ground compensation device work in current source mode, compensation electric current is exported using the active ground compensation device
To system neutral, wherein when the active ground compensation device is without containing compensation inductance, according toIt calculates
To the compensation electric current, when the active ground compensation device contains compensation inductance, according toIt is calculated
The compensation electric current, ICOMForThe phase voltage for being Earth Phase before being grounded, ω are system voltage angular frequency, and L is described
The induction reactance value of inductance is compensated, C is system distribution capacity over the ground.
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| CN201910654301.9A CN110311380B (en) | 2019-07-19 | 2019-07-19 | Active grounding compensator control method |
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| CN201910654301.9A CN110311380B (en) | 2019-07-19 | 2019-07-19 | Active grounding compensator control method |
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| CN110311380B CN110311380B (en) | 2023-05-23 |
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Cited By (1)
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| CN112260249A (en) * | 2020-10-21 | 2021-01-22 | 西安工程大学 | Flexible arc extinction method for single-phase earth fault of power distribution network |
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