CN107785882A - A kind of more level active compensation devices of three-phase four-arm and control method - Google Patents
A kind of more level active compensation devices of three-phase four-arm and control method Download PDFInfo
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- CN107785882A CN107785882A CN201611031915.4A CN201611031915A CN107785882A CN 107785882 A CN107785882 A CN 107785882A CN 201611031915 A CN201611031915 A CN 201611031915A CN 107785882 A CN107785882 A CN 107785882A
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- power
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- residual voltage
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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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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
-
- 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
- H02J3/01—Arrangements for reducing harmonics or ripples
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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
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
- H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
- H02J3/1842—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters
- H02J3/1857—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters wherein such bridge converter is a multilevel converter
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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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- 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
- Y02E40/40—Arrangements for reducing harmonics
Abstract
The present invention relates to a kind of more level active compensation devices of three-phase four-arm and control method.Described device includes detection unit, control unit and compensating unit；Wherein, the detection unit connection described control unit, for obtaining the residual voltage of power distribution network bus and being transferred to described control unit；Described control unit connects the compensating unit, for judging whether the power distribution network bus occurs singlephase earth fault and generate control signal according to the residual voltage；The compensating unit connects the power distribution network bus, in the presence of the control signal to the power distribution network bus injecting compensating electric current or zero-sequence current.The control method is based on the more level active compensation devices of above-mentioned three-phase four-arm and realized.The present invention can realize that reliable arc extinguishing during singlephase earth fault occurs for power distribution network bus.
Description
Technical field
The present invention relates to electric power network technique field, more particularly to a kind of more level active compensation devices of three-phase four-arm and control
Method.
Background technology
China's power network neutral point uses small current neutral grounding mode, including isolated neutral, through arc suppression coil, high resistance
Earthing mode.The reactance of earth point Zero sequence synthetic is bigger than positive sequence synthesis reactance, after singlephase earth fault occurs, does not form short circuit
Current path, failure phase and non-faulting mutually flow through load current, and earth fault and wire direct-to-ground capacitance form current path, from
And power distribution network is run the long period and search failure, be improved power supply reliability.
, it is necessary to using arc suppression coil compensation capacitance current after current in the fault point reaches certain value, make current in the fault point control
Make in certain limit, can so avoid producing electric arc, above-mentioned way claims resonance grounding or compensation of ground.It is good in stand-by power supply
In the case of, power distribution network can also use Neutral Grounding through Resistance in Electrical method, faulty line is produced larger fault current, fast
Speed tripping operation, avoids arc grounding over-voltage to causing equipment to injure.
Because arc suppression coil can only compensate First Harmonic Reactive Power, and produce leakage current.After power distribution network reaches certain scale,
The leakage current of Single-phase Ground Connection Failure may make trouble point can not blow-out.Therefore needing to provide a kind of device and method makes to match somebody with somebody
Power network occurs during singlephase earth fault the electric arc of trouble point can be made reliably to extinguish.
The content of the invention
For in the prior art the defects of, the present invention provides a kind of more level active compensation devices of three-phase four-arm and control
Method, can solve trouble point when singlephase earth fault occurs for power distribution network in the prior art and produce what electric arc can not reliably extinguish
Problem.
In a first aspect, the invention provides a kind of more level active compensation devices of three-phase four-arm, including：Detection unit,
Control unit and compensating unit；Wherein,
The detection unit connects described control unit, for obtaining power distribution network residual voltage and being transferred to the control list
Member；
Described control unit connects the compensating unit, for judging whether the power distribution network is sent out according to the residual voltage
Raw singlephase earth fault simultaneously generates control signal；
The compensating unit connects the power distribution network, for being injected in the presence of the control signal to the power distribution network
Compensate electric current or zero-sequence current.
Alternatively, the compensating unit includes the power subelement of the ABC phases corresponding to the power distribution network；
The connection power supply subelement first end of the power subelement of corresponding A BC phases connects power supply subelement respectively；Second end
It is connected to form neutral point and the neutral-point solid ground.
Alternatively, the power subelement is made up of at least two power models, at least two power models series connection.
Alternatively, the power model includes the H bridges that 4 switching devices and electric capacity are formed；
The positive pole of the first end connection electric capacity of first switch device, the second end connects the first end of the 3rd switching device, institute
The second end for stating the 3rd switching device connects the negative pole of the electric capacity；
The positive pole of the first end connection electric capacity of second switch device, the second end connects the first end of the 4th switching device, institute
The second end for stating the 4th switching device connects the negative pole of the electric capacity.
When power subelement is made up of at least two power models, first switch device and the 3rd switch in the H bridges
The of second switch device and the 4th switching device in the first end connection power supply subelement or upper level power model of device
Two ends, second switch device is connected the first switch device and of next stage power model with the 4th switching device in the H bridges
The first end or ground of three switching devices.
Alternatively, the quantity of the power model of series connection and the relation of line voltage are：
UAB,BC,CA=VH×N；
Wherein, UAB,BC,CARepresent line voltage, VHH bridge rated outputs are represented, N represents the quantity of cascaded H bridge.
Alternatively, the detection unit includes voltage transformer.
Second aspect, truth example of the present invention additionally provide a kind of more level actives of three-phase four-arm being used for as described above
The control method of compensation device, including：
Generation injection control signal makes the compensating unit inject zero-sequence current to power distribution network bus, to obtain the distribution
The direct-to-ground capacitance and bleeder resistance of net；
Obtain the residual voltage of the power distribution network, when the residual voltage exceedes residual voltage preset value if judge to occur
Singlephase earth fault；
The amplitude and phase of compensation electric current are calculated according to the residual voltage and the direct-to-ground capacitance and leak resistance, so that
The compensating unit is injected into the power distribution network of generation singlephase earth fault by electric current is compensated.
Alternatively, the compensation electric current is capacity current and leakage current over the ground.
Alternatively, when the residual voltage is not less than residual voltage preset value, the control method also includes：
According to the amplitude and phase relation of the voltage and current of power distribution network ABC phases, compensation electric current is obtained and by the compensation
Unit is injected into the power distribution network bus to improve its power factor.
Alternatively, the quantity of the power model of series connection is calculated using following formula：
UAB,BC,CA=VH×N；
Wherein, UAB,BC,CARepresent line voltage, VHH bridge rated outputs are represented, N represents the quantity of cascaded H bridge.
As shown from the above technical solution, the present invention provides through the residual voltage for setting detection unit to obtain power distribution network bus
And it is transferred to described control unit；Judge whether power distribution network bus occurs singlephase earth fault according to residual voltage by control unit
And generate control signal；Compensating unit in the presence of the control signal to the power distribution network bus injecting compensating electric current or
Zero-sequence current.When singlephase earth fault occurs, compensating unit is to power distribution network bus injecting compensating electric current, so that current in the fault point
Control avoids trouble point that electric arc occurs in predetermined target value；When without singlephase earth fault, injection zero-sequence current is matched somebody with somebody with detecting
Power network is to earth-current.The present invention can compensate electric current by harmonic into power network, and making up arc suppression coil in the prior art can only mend
The defects of repaying First Harmonic Reactive Power.Also, the present invention can actively inject zero-sequence current, pair of power distribution network when calculating normal work
Ground electric capacity and bleeder resistance, not only with compensating electric capacity electric current but also leak resistance electric current can be can also compensate for, improve the standard of compensation
True rate.
Brief description of the drawings
The features and advantages of the present invention can be more clearly understood by reference to accompanying drawing, accompanying drawing is schematically without that should manage
Solve to carry out any restrictions to the present invention, in the accompanying drawings：
Fig. 1 is a kind of more level active compensation device structural representations of three-phase four-arm provided in an embodiment of the present invention；
Fig. 2 is the electrical block diagram of A phases compensating unit in Fig. 1；
Three-phase four-arm more level active compensation device compensation current diagrams when Fig. 3 is singlephase earth fault；
Fig. 4 is provided in an embodiment of the present invention a kind of to be used for the more level active compensation devices of three-phase four-arm described in Fig. 1
Control method.
Embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
Part of the embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art
The every other embodiment obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.
In a first aspect, the invention provides a kind of more level active compensation devices of three-phase four-arm, as shown in figure 1, including：
Detection unit 1, control unit 2 and compensating unit 3；Wherein,
Detection unit 1 connects control unit 2, for obtaining the residual voltage of power distribution network and being transferred to control unit 2；
Control unit 2 connects compensating unit 3, for judging whether power distribution network occurs singlephase earth fault according to residual voltage
And generate control signal；
Compensating unit 3 connects power distribution network, in the presence of control signal to power distribution network bus injecting compensating electric current or
Person's zero-sequence current.
It should be noted that detection unit 1 also includes voltage transformer in the embodiment of the present invention.The detection unit 1 is specific
For gathering the residual voltage of power distribution network bus, circuit realiration of the prior art can be used, will not be described in detail herein.The detection
Unit 1 can measure the voltage of every phase bus respectively and then synthesize residual voltage, can also measure three-phase bus synthesis simultaneously
Residual voltage, specific metering system can select according to scene, which kind of mode can obtain residual voltage regardless of, the present invention is not
It is construed as limiting.
The effect of control unit 2 is to judge power distribution network according to the residual voltage that detection unit 1 detects in the embodiment of the present invention
Whether bus occurs singlephase earth fault, for example, singlephase earth fault or working properly, then basis occur for power distribution network bus
Control signal corresponding to demand generation.In practical application, the control unit 2 can use such as single-chip microcomputer, DSP or ARM cores
Piece etc. realizes that those skilled in the art can select suitable control chip according to concrete scene, and the present invention no longer limits.
In the embodiment of the present invention, compensating unit 2 includes the power subelement of the ABC phases corresponding to power distribution network；Corresponding A BC phases
Power subelement connection power supply subelement first end connect power supply subelement respectively；Second end be connected to form neutral point and
Neutral ground.As shown in figure 1, the compensating unit 3 includes A phase power subelement 31, B phase power subelement 32 and C phase work(
Rate subelement 33.Wherein, the first end (figure of A phases power subelement 31, B phase power subelement 32 and C phase power subelement 33
Top in 1) it is respectively connected to the A phase, B phase, C phase of power distribution network bus；Second end (Fig. 1 lower section) forms neutral point and the neutrality
Point is connected to ground.Each power subelement is connected with control unit 2, in the presence of control signal each power subelement to
The power distribution network injecting compensating electric current of earth fault occurs.
As shown in figure 1, when power subelement is made up of at least two power models, at least two power model series connection
Form.The power model includes the H bridges that 4 switching devices and electric capacity are formed.The first end connection electricity of first switch device
Appearance C1 positive pole (at the points of P1 shown in Fig. 2), the first end (at the points of P2 shown in Fig. 2) of the 3rd switching device of the second end connection, the 3rd
The negative pole of the second end connection electric capacity of switching device (at the points of P3 shown in Fig. 2)；The first end connection electric capacity of second switch device
Positive pole, the second end connect the first end (at the points of P4 shown in Fig. 2) of the 4th switching device, the second end connection institute of the 4th switching device
State the negative pole of electric capacity.
When power subelement is made up of at least two power models, first switch device and the 3rd switch in the H bridges
The of second switch device and the 4th switching device in the first end connection power supply subelement or upper level power model of device
Two ends, second switch device is connected the first switch device and of next stage power model with the 4th switching device in the H bridges
The first end or ground of three switching devices.
Power subelement is in series by 5 power models in one embodiment of the invention, the circuit shown in Fig. 2 successively to
Down for first power model A1, second power model A2 ..., (A2, A3, A4, A5 are in fig. 2 by the 5th power model A5
It is not shown), wherein the input A connection A phase buses of first power subelement, output end connects second power subelement A2
Input；Second power subelement A2 output end connects the 3rd power subelement A3 input ... ..., the 5th
The output end connection ground of power model.When power subelement is made up of 1 power model, the first input of the power model is defeated
Go out P1 connection electric capacity C1 positive pole, the 3rd input and output P3 connection electric capacity C1 negative pole, the second input and output P2 connection A phases mother
Line, the 4th input and output P4 connect the output end of the power subelement.The embodiment of the present invention is controlled often respectively by control unit 2
The switch of switching device charges to electric capacity C in individual H bridges, or the above-mentioned switching device of control is from electric capacity C to high voltage distribution network bus
Electric discharge.
It should be noted that power subelement is formed using at least two power models in the embodiment of the present invention.With work(
The increase of rate module, in the case where power distribution network busbar voltage is constant, the gradual step-down of partial pressure of each power model, so as to
Increase the service life of switching device in power model.In addition, multiple power models can be entered according to the needs of actual scene
Row series connection, allows the more level active compensation devices of the three-phase four-arm in the application to apply the power distribution network in greater degree voltage
In.
In order to facilitate the quantity of confirmation power model, the quantity and line voltage of the power model connected in the embodiment of the present invention
Relation be：
UAB,BC,CA=VH×N；
Wherein, UAB,BC,CARepresent line voltage, VHH bridge rated outputs are represented, N represents that single power word cell and ground connection are single
First H bridges quantity and.
When the quantity of power subelement output-voltage levels number and power model meets：
Q=2 × N+1；
Wherein, Q represents output-voltage levels number.
In practical application, can according to power distribution network busbar voltage (when isolated neutral, or single-phase earthing occurs therefore
Barrier, perfect phase voltage riseAgain, it is therefore desirable to configured according to line voltage) and the pressure-resistant determination of power model is each
The quantity of the power model of power subelement, so as to realize that each power model is operated in effective resistance to intermediate pressure section.
A kind of course of work of the more level active compensation devices of three-phase four-arm provided in an embodiment of the present invention includes：
During power distribution network normal work, the generation injection control signal of control unit 2 is sent to compensating unit 3.Compensating unit 3
The power subelement of ABC phases is sent to according to injection control signal generation respective switch signal, the switching signal is each power
The open and close signal of switching device control terminal in module, by controlling the open and close of power model to be injected to power distribution network
Zero-sequence current.Detection unit 1 now detects the residual voltage of power distribution network bus, according to Injection Current and the residual voltage of measurement,
So as to obtain the direct-to-ground capacitance of power distribution network and bleeder resistance.
When residual voltage exceedes residual voltage preset value, detection unit 1 judges that single-phase earthing event occurs for power distribution network bus
Barrier.As shown in figure 3, now control unit 2 calculates benefit according to the residual voltage currently measured and the direct-to-ground capacitance measured before
Repay the amplitude and phase of electric current.Circular：
Such as A, B, C phase voltage are before single-phase faultA phases occur single-phase
Metallic short circuit, each phase voltage are changed intoIt is electric over the ground that power distribution network is measured before failure
It is R to hold for C and leak resistance, and capacitance current caused by power distribution network and Leakage Current sum areIt is I that compensation device, which produces compensation electric current,B=-I.
Control unit 2 generates compensating control signal according to above-mentioned compensation electric current and is sent to compensating unit 3.Compensating unit 3
According to above-mentioned compensating control signal into power distribution network bus (B phases and C phases bus in such as Fig. 3) injecting compensating electric current, so as to will be single-phase
The current limit of trouble point avoids electric arc from occurring in minimum value.
In practical application, according to the demand of different power distribution networks, the more level of three-phase four-arm provided in an embodiment of the present invention
Active power compensator can have different compensation ways.For example, when power distribution network bus needs band singlephase earth fault operation, this
When compensate electric current as capacity current over the ground.When power distribution network needs quick excision singlephase earth fault, the compensation electric current was
Electric current is compensated, can so start zero-sequenceprotection fast trip, so as to cut off faulty line and Single-phase Ground Connection Failure.
In practical application, the bleeder resistance that the embodiment of the present invention measures can conveniently detect the insulation situation of power distribution network, carry
High security of distribution network energy.
In practical application, the more level active compensation devices of three-phase four-arm provided in an embodiment of the present invention are also used as nothing
Reactive power compensation installations use.Control unit 2 obtains the power factor of power distribution network bus, then generates control compensation according to power factor
The control signal that unit 3 acts, the reactive power and harmonic power of control power subelement compensation power distribution network, so as to reach regulation
The purpose of distribution network voltage quality.
Second aspect, the embodiment of the present invention additionally provide a kind of more level actives of three-phase four-arm being used for as described above
The control method of compensation device, as shown in figure 4, including：
S1, generation injection control signal make the compensating unit inject zero-sequence current to power distribution network bus, with described in acquisition
The direct-to-ground capacitance and bleeder resistance of power distribution network；
S2, the residual voltage for obtaining the power distribution network bus, when the residual voltage exceedes residual voltage preset value if
Judge singlephase earth fault occurs；
S3, the amplitude and phase for compensating electric current are calculated according to the residual voltage and the direct-to-ground capacitance, so that the benefit
Repay unit and compensation electric current is injected into the power distribution network that singlephase earth fault occurs.
Alternatively, the compensation electric current is capacity current and leakage current over the ground.
Alternatively, when the residual voltage is not less than residual voltage preset value, the control method also includes：
According to distribution network electric energy quality situation, such as power factor, harmonic content etc., so that the compensating unit is by the benefit
Repay electric current to be injected into the power distribution network bus, compensating reactive power and harmonic carcellation, to improve its power factor.
Alternatively, the quantity of the power model of series connection is calculated using following formula：
UAB,BC,CA=VH×N；
Wherein, UAB,BC,CARepresent line voltage, VHH bridge rated outputs are represented, N represents that single power word cell and ground connection are single
First H bridges quantity and.
As seen from the above, control method provided in an embodiment of the present invention is based on the more level of three-phase four-arm described above
Active power compensator is realized, thus can solve same technical problem, and obtains identical technique effect, herein no longer one by one
Repeat.
In the present invention, term " first ", " second ", " the 3rd " are only used for describing purpose, and it is not intended that instruction or
Imply relative importance.Term " multiple " refers to two or more, is limited unless otherwise clear and definite.
Although being described in conjunction with the accompanying embodiments of the present invention, those skilled in the art can not depart from this hair
Various modifications and variations are made in the case of bright spirit and scope, such modifications and variations are each fallen within by appended claims
Within limited range.
Claims (10)
- A kind of 1. more level active compensation devices of three-phase four-arm, it is characterised in that including：Detection unit, control unit and benefit Repay unit；Wherein,The detection unit connects described control unit, for obtaining power distribution network residual voltage and being transferred to described control unit；Described control unit connects the compensating unit, for judging whether the power distribution network occurs list according to the residual voltage Phase earth fault simultaneously generates control signal；The compensating unit connects the power distribution network, in the presence of the control signal to the power distribution network injecting compensating Electric current or zero-sequence current.
- 2. the more level active compensation devices of three-phase four-arm according to claim 1, it is characterised in that the compensating unit Include the power subelement of the ABC phases corresponding to the power distribution network；The connection power supply subelement first end of the power subelement of corresponding A BC phases connects power supply subelement respectively；Second end is connected Connect and form neutral point and the neutral-point solid ground.
- 3. the more level active compensation devices of three-phase four-arm according to claim 2, it is characterised in that power is single Member is made up of at least two power models, at least two power models series connection.
- 4. the more level active compensation devices of three-phase four-arm according to claim 3, it is characterised in that the power model The H bridges formed including 4 switching devices and electric capacity；The positive pole of the first end connection electric capacity of first switch device, the second end connect the first end of the 3rd switching device, and described the Second end of three switching devices connects the negative pole of the electric capacity；The positive pole of the first end connection electric capacity of second switch device, the second end connect the first end of the 4th switching device, and described the Second end of four switching devices connects the negative pole of the electric capacity.When the power subelement is made up of at least two power models, first switch device and the 3rd switch in the H bridges The of second switch device and the 4th switching device in the first end connection power supply subelement or upper level power model of device Two ends, second switch device is connected the first switch device and of next stage power model with the 4th switching device in the H bridges The first end or ground of three switching devices.
- 5. the more level active compensation devices of three-phase four-arm according to claim 4, it is characterised in that the power mould of series connection The quantity of block and the relation of line voltage are：UAB,BC,CA=VH×N；Wherein, UAB,BC,CARepresent line voltage, VHH bridge rated outputs are represented, N represents the quantity of cascaded H bridge.
- 6. the more level active compensation devices of three-phase four-arm according to claim 1, it is characterised in that the detection unit Including voltage transformer.
- A kind of 7. controlling party for being used for the more level active compensation devices of three-phase four-arm as described in any one of claim 1~6 Method, it is characterised in that including：Generation injection control signal makes the compensating unit inject zero-sequence current to power distribution network bus, to obtain the power distribution network Direct-to-ground capacitance and bleeder resistance；Obtain the residual voltage of the power distribution network, when the residual voltage exceedes residual voltage preset value if judge to occur it is single-phase Earth fault；The amplitude and phase of compensation electric current are calculated according to the residual voltage and the direct-to-ground capacitance and leak resistance, so that described Compensating unit is injected into the power distribution network of generation singlephase earth fault by electric current is compensated.
- 8. control method according to claim 7, it is characterised in that the compensation electric current is capacity current and leakage over the ground Electric current.
- 9. control method according to claim 7, it is characterised in that when the residual voltage is preset not less than residual voltage During value, the control method also includes：According to the amplitude and phase relation of the voltage and current of power distribution network ABC phases, compensation electric current is obtained and by the compensating unit It is injected into the power distribution network bus to improve its power factor.
- 10. control method according to claim 7, it is characterised in that the quantity of the power model of series connection utilizes following table It is calculated up to formula：UAB,BC,CA=VH×N；Wherein, UAB, BC, CARepresent line voltage, VHH bridge rated outputs are represented, N represents the quantity of cascaded H bridge.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107785883A (en) * | 2016-08-31 | 2018-03-09 | 中国石油化工股份有限公司 | A kind of more level active compensation devices of three-phase four-arm and control method |
| CN107785884A (en) * | 2016-08-31 | 2018-03-09 | 中国石油化工股份有限公司 | A kind of more level active compensation devices of three-phase four-arm and control method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107785883A (en) * | 2016-08-31 | 2018-03-09 | 中国石油化工股份有限公司 | A kind of more level active compensation devices of three-phase four-arm and control method |
| CN107785884A (en) * | 2016-08-31 | 2018-03-09 | 中国石油化工股份有限公司 | A kind of more level active compensation devices of three-phase four-arm and control method |
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Application publication date: 20180309 |