CN106786471A - A kind of unidirectional active power compensator of power network neutral point isolated neutral system - Google Patents
A kind of unidirectional active power compensator of power network neutral point isolated neutral system Download PDFInfo
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- CN106786471A CN106786471A CN201510813376.9A CN201510813376A CN106786471A CN 106786471 A CN106786471 A CN 106786471A CN 201510813376 A CN201510813376 A CN 201510813376A CN 106786471 A CN106786471 A CN 106786471A
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- distribution network
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/08—Limitation or suppression of earth fault currents, e.g. Petersen coil
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Abstract
The present invention relates to a kind of power distribution network single-phase active compensation device, it is characterised in that described device includes：Detection unit, is connected on the three-phase of power distribution network, for detecting fault message；Inversion unit, the output end of the inversion unit is connected in any phase of the power distribution network, for when the power distribution network occurs singlephase earth fault, producing compensation electric current；Rectification unit, on input connection any two-phase bus of power distribution network of the rectification unit, output end is connected to the input of the inversion unit, and the inversion unit is supplied to for the alternating current of the power distribution network to be converted into direct current；Control unit, for controlling the detection unit and inversion unit.The alternating current of power distribution network is converted into direct current and is supplied to inverter circuit, so as to improve compensation efficiency by the present invention by setting inverter circuit by rectification circuit.
Description
Technical field
The present invention relates to power distribution network grounding technology field, more particularly, to a kind of power network neutral point isolated neutral system single-phase active compensation device.
Background technology
Non-effective earthing mode is used China 1-66kV medium voltage distribution network neutral points more, it is commonly called as small current neutral grounding mode, traditionally mainly including it is earth-free, through grounding through arc and through three kinds of modes such as high resistance grounds, now also including based on active electric power electronic equipment, be capable of achieving the active earthing mode of the full electrical quantity compensation such as earth-fault current reactive component, active component.
Neutral grounding mode, earth current size is divided into heavy current grounding system and small current neutral grounding system when most commonly by single-line to ground fault.Heavy current grounding system includes neutral-point solid ground and Neutral Point Through Low Resistance, and small current neutral grounding mode includes isolated neutral mode and neutral by arc extinction coil grounding mode.High current earthing mode is also referred to as effective grounding mode, and small current neutral grounding mode is referred to as non-effective earthing mode.Earth point Zero sequence synthetic reactance X0With positive sequence synthesis reactance X1Ratio, China specifies X0/X1When >=4~5, belong to small current neutral grounding system.
System with non effectively earth ed neutral, after singlephase earth fault occurs, does not form short-circuit current paths, and failure phase mutually flows through load current with non-faulting, and earth fault and wire direct-to-ground capacitance form current path, and capacitance current circulates between wire and the earth.
Existing current compensation method is to carry out Passively compensated or active compensation, and Passively compensated method refers mainly to arc suppression coil, less efficient, therefore using being limited in scope；New Method of Active Electronic Compensation it is conventional be by parallel with arc suppression coil, to access inverter circuit and produce in neutral point and compensate electric current so that the electric current of earth fault is zero, but need to be used cooperatively with arc suppression coil, using being restricted.
The content of the invention
Based on above mentioned problem, the present invention proposes a kind of power distribution network single-phase active compensation device, by setting inverter circuit, the alternating current of power distribution network is converted into direct current by rectification circuit and is supplied to inverter circuit, so as to improve compensation efficiency.
For achieving the above object, it is of the invention that a kind of power distribution network single-phase active compensation device is provided, it is characterised in that described device includes：
Detection unit, is connected on the three-phase of power distribution network, for detecting fault message；
Inversion unit, the output end of the inversion unit is connected in any phase of the power distribution network, for when the power distribution network occurs singlephase earth fault, producing compensation electric current；
Rectification unit, on input connection any two-phase bus of power distribution network of the rectification unit, output end is connected to the input of the inversion unit, and the inversion unit is supplied to for the alternating current of the power distribution network to be converted into direct current；
Control unit, for controlling the detection unit, inversion unit.
Wherein, by the rectification unit for the inversion unit provides dc source, the inversion unit produces compensation electric current, and the electric current of the trouble point is zero.
Wherein, described device also includes the capacitor in parallel with the inversion unit.
Wherein, the rectification unit is diode single phase bridge type rectifier circu.
Wherein, the rectification unit includes two bridge arms in parallel, and two diodes are included on each described bridge arm
Wherein, the inversion unit is single-phase controllable full bridge inverter.
Wherein, the inversion unit includes two bridge arms in parallel, and two gate-controlled switch devices are included on each described bridge arm, and diode is parallel with described each gate-controlled switch device.
Power distribution network single-phase active compensation device of the invention, is converted into DC current and is supplied to inverter circuit by rectification circuit by the alternating current of power distribution network, improves compensation efficiency.In addition, compensation device of the invention can produce specific compensation electric current for leakage current and harmonic current.Meanwhile, the present apparatus need not coordinate with arc suppression coil can eliminate fault electric arc, can reduce power distribution network and the probability of other failures occurs.Additionally, compensation device of the invention can be connected in any phase of power distribution network, its is flexible for installation, easy to use.
Brief description of the drawings
By reference toAccompanying drawingThe features and advantages of the present invention can be more clearly understood from,Accompanying drawingIt is schematical and should not be construed as carrying out the present invention any limitation,In accompanying drawing：
Figure 1Show the structural representation of the power distribution network single-phase active compensation device of the embodiment of the present inventionFigure。
Figure 2Show the structural representation of the rectification unit of the power distribution network single-phase active compensation device of the embodiment of the present inventionFigure。
Figure 3Show the structural representation of the inversion unit of the power distribution network single-phase active compensation device of the embodiment of the present inventionFigure。
Figure 4Show that the current work for perfecting phase of one embodiment of the present of invention is illustratedFigure。
Figure 5Show that the current work of the failure phase of one embodiment of the present of invention is illustratedFigure。
Specific embodiment
Below in conjunction withAccompanying drawingEmbodiments of the present invention is described in detail.
Figure 1Show the structural representation of the power distribution network single-phase active compensation device of the embodiment of the present inventionFigure。
For achieving the above object, of the invention to provide a kind of power distribution network single-phase active compensation device, described device includes：
Detection unit 10, is connected on the three-phase of power distribution network, for detecting fault message
Inversion unit 20, the output end of the inversion unit is connected on any phase bus of the power distribution network, for when the line failure, producing compensation electric current；
Rectification unit 30, the input of the rectification unit is connected on any two-phase bus of power distribution network, and output end is connected to the input of the inversion unit, and the inversion unit is supplied to for the alternating current of the power distribution network to be converted into direct current；
Control unit 50, for controlling the detection unit, inversion unit.
In above-described embodiment, rectification unit 30 is diode single phase bridge type rectifier circu, and inversion unit 20 is unidirectional controllable full bridge inverter.
The present invention collects, and phase-to-ground voltage is not definite value after power distribution network single-phase earthing, but line voltage is definite value.Using diode single phase bridge type rectifier circu, input accesses any two-phase of power distribution network, can provide stable DC electricity.
In the present embodiment, compensating reactive power capacitance current, do not consume active power, compensation leakage current and harmonic current consumption active power, the tube voltage drop of IGBT, line resistance equal loss also consume active power, the ratio that compensating electric capacity electric current accounts for total current is very high, therefore the capacity of fairing is smaller, can select low-power diode.Figure 2Show the structural representation of the rectification unit of the power distribution network active power compensator of the embodiment of the present inventionFigure。
In one embodiment,As schemed 2Shown, rectification unit includes two bridge arms in parallel, and two diodes are included on each described bridge arm.
In addition, being parallel with capacitor C on energy storage device, shunt capacitance C plays energy storage and DC filtering, and electric capacity C reduces VD ripple, is approximately constant.
The inversion unit of the present embodiment produces compensation electric current, and inverter front end electric capacity C act as energy storage, reactive power is circulated back and forth between distribution network system and compensation device, electric flux energy storage is in the electric capacity of front end, requirement of the inversion unit to capacitance is higher than rectification unit, therefore capacitance basis for selecting inversion unit capacity requirement.
Figure 3Show the structural representation of the inversion unit of the power distribution network single-phase active compensation device of the embodiment of the present inventionFigure。
As schemed 3Shown, inversion unit includes two bridge arms in parallel, and including being parallel with each gate-controlled switch device described in two gate-controlled switch devices on each described bridge arm can diode.
In the active power compensator using the invention described above, fault data is gathered first with detection unit 10, when there is singlephase earth fault, perfect phase-to-ground voltage rising, the reduction of failure phase-to-ground voltage selects failure phase according to phase voltage feature.
When a certain phase earth fault, the detection unit judges whether the bus that the failure is connected with the inversion unit is same phase；
By the rectification unit for the inversion unit provides dc source, the inversion unit produces compensation electric current, and the electric current of the trouble point is zero.
Being described in detail below by way of specific embodiment carries out the process of current compensation using active power compensator of the invention.
Figure 4Show that the work of the electric current for perfecting phase of one embodiment of the present of invention is illustratedFigure。
After detecting C phases and breaking down, start active power compensator, rectification unit converts alternating current to direct current, for inversion unit provides DC current.
As schemed 4It is shown, after active power compensator access, produce compensation electric current to be equal to IS, part compensation B phase capacitance currents ICB, part compensation A phase capacitance currents ICA, A, B phase, compensation device, the loop of system are formed, trouble point is flowed through there is no electric current, therefore current in the fault point is zero, has extinguished electric arc, has reached compensation target.
Figure 5Show that the failure phase active compensation work of one embodiment of the present of invention is illustratedFigure。
As schemed 5Shown, when fairing after A phases break down is detected, for inversion unit provides direct current, inversion unit produces compensation electric current to be equal to IS, part compensation B phase capacitance currents, part compensation C phase capacitance currents form B, C phase, compensation device, system circuit, trouble point are flowed through there is no electric current, therefore current in the fault point is zero, eliminates electric arc, has reached compensation target.
Power distribution network active power compensator of the invention, inverter circuit is supplied to by setting inverter circuit, and the alternating current of power distribution network being converted into DC current by rectification circuit, improves compensation efficiency.In addition, compensation device of the invention can produce specific compensation electric current for leakage current and harmonic current.Meanwhile, the present apparatus need not coordinate with arc suppression coil can eliminate fault electric arc, can reduce power distribution network and the probability of other failures occurs.Additionally, compensation device of the invention can be connected in any phase of power distribution network, its is flexible for installation, easy to use.
Above specific embodiment is only used to illustrate specific implementation technical scheme of the invention and unrestricted, although being described in detail to the present invention with reference to example, those skilled in the art should be understood, technical scheme can be modified or equivalent, without deviating from the spirit and scope of technical solution of the present invention, it all should cover in the middle of scope of the presently claimed invention.
Claims (7)
1. a kind of power distribution network single-phase active compensation device, it is characterised in that described device includes：
Detection unit, is connected on the three-phase of power distribution network, for detecting fault message；
Inversion unit, the output end of the inversion unit is connected in any phase of the power distribution network, for when the power distribution network occurs singlephase earth fault, producing compensation electric current；
Rectification unit, on input connection any two-phase bus of power distribution network of the rectification unit, output end is connected to the input of the inversion unit, and the inversion unit is supplied to for the alternating current of the power distribution network to be converted into direct current；
Control unit, for controlling the detection unit and inversion unit.
2. active power compensator according to claim 1, it is characterised in that by the rectification unit for the inversion unit provides dc source, the inversion unit produces compensation electric current, and the electric current of the trouble point is zero.
3. active power compensator according to claim 1, it is characterised in that described device also includes the capacitor in parallel with the inversion unit.
4. active power compensator according to claim 1, it is characterised in that the rectification unit is diode single phase bridge type rectifier circu.
5. active power compensator according to claim 1, it is characterised in that the rectification unit includes two bridge arms in parallel, includes two diodes on each described bridge arm.
6. single-phase active compensation device according to claim 1, it is characterised in that the inversion unit is single-phase controllable full bridge inverter.
7. active power compensator according to claim 1, it is characterised in that the inversion unit includes two bridge arms in parallel, includes two gate-controlled switch devices on each described bridge arm, diode is parallel with described each gate-controlled switch device.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510813376.9A CN106786471A (en) | 2015-11-20 | 2015-11-20 | A kind of unidirectional active power compensator of power network neutral point isolated neutral system |
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| CN201510813376.9A CN106786471A (en) | 2015-11-20 | 2015-11-20 | A kind of unidirectional active power compensator of power network neutral point isolated neutral system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113131457A (en) * | 2021-04-16 | 2021-07-16 | 福州大学 | Active arc extinction method for power distribution network ground fault without power supply on direct current side of converter |
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| CN113131457B (en) * | 2021-04-16 | 2022-05-10 | 福州大学 | Active arc extinction method for power distribution network ground fault without power supply on direct current side of converter |
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