CN107888118A - Suitable for the asynchronous generator rectifier power system of short-circuit protection - Google Patents
Suitable for the asynchronous generator rectifier power system of short-circuit protection Download PDFInfo
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- CN107888118A CN107888118A CN201711412357.0A CN201711412357A CN107888118A CN 107888118 A CN107888118 A CN 107888118A CN 201711412357 A CN201711412357 A CN 201711412357A CN 107888118 A CN107888118 A CN 107888118A
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- 230000005284 excitation Effects 0.000 claims abstract description 50
- 238000004804 winding Methods 0.000 claims abstract description 15
- 230000000052 comparative effect Effects 0.000 claims abstract description 6
- 239000003990 capacitor Substances 0.000 claims description 10
- 238000011105 stabilization Methods 0.000 claims description 6
- 230000009466 transformation Effects 0.000 claims description 3
- 230000006641 stabilisation Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 4
- 230000006698 induction Effects 0.000 description 3
- 230000033228 biological regulation Effects 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000033772 system development Effects 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
- H02P9/14—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field
- H02P9/26—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field using discharge tubes or semiconductor devices
- H02P9/30—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field using discharge tubes or semiconductor devices using semiconductor devices
- H02P9/305—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field using discharge tubes or semiconductor devices using semiconductor devices controlling voltage
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P2103/00—Controlling arrangements characterised by the type of generator
- H02P2103/10—Controlling arrangements characterised by the type of generator of the asynchronous type
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Eletrric Generators (AREA)
- Rectifiers (AREA)
Abstract
A kind of asynchronous generator rectifier power system suitable for short-circuit protection, including asynchronous generating unit, main power rectification device, excitation unit, filter and controller.The stator winding of asynchronous generating unit is connected with main power rectification device.The AC of excitation unit is connected with one end of filter, and the other end of filter is connected with the stator winding of asynchronous generating unit and the input of main power rectification device respectively.Controller is used for the output voltage u for obtaining main power rectification devicedcWith output current idc, asynchronous generating unit output voltage and the DC voltage u of output current and excitation unitdc1, the output current i based on acquired value and main power rectification devicedcWith default short circuit current threshold value IThresholdBetween comparative result excitation unit is controlled accordingly.The present invention is not on the basis of generator commutation performance is influenceed, it is possible to achieve the selectivity of direct-flow distribution system and quick restorative when short-circuit.
Description
Technical field
The present invention relates to direct current network distribution system, more particularly to a kind of asynchronous generator electric power system.
Background technology
As electronic technology development is rapid, shipbuilding industry increasingly pays close attention to application of the direct current network on ship, exchange hair
Motor rectifier power system is made up of alternating current generating sets, fairing, dc bus, and such system has that stability is good, body
Product is small, easy arrangement, controls the features such as easy to adjust, generator easy care, is increasingly becoming the development side of large-scale autonomous power supply system
To.With the increase of system power, short-circuit impact electric current has been over limit connection and the breaking capacity of existing breaker, together
When have also exceeded form fairing power electronic devices（Such as IGBT）The several times of running current, once direct current occurs
Busbar short-circuit failure, it is possible to alternating current generating sets can be caused to be stopped, cause blackout.Therefore it is short how to solve bus
Selective protection during road and the contradiction between the fragility of power electronic equipment, turn into the bottleneck problem of the System Development.
The content of the invention
The technical problems to be solved by the invention are that providing a kind of asynchronous generator rectification suitable for short-circuit protection supplies
Electric system, which solve in direct-flow distribution system, the fragility of selective protection and power electronic equipment during dc bus short circuit
Contradiction between property, on the basis of generator commutation performance is not influenceed, it is possible to achieve the selection of direct-flow distribution system when short-circuit
Property and it is quick restorative.
In order to solve the above technical problems, the technical solution used in the present invention is：
Suitable for the asynchronous generator rectifier power system of short-circuit protection, including asynchronous generating unit, main power rectification device, encourage
Magnetic device, filter and controller；The stator winding of asynchronous generating unit is connected with the input of main power rectification device, main
Power rectification device is used to provide dc source to external loading；The AC of excitation unit is connected with one end of filter,
The other end of filter is connected with the stator winding of asynchronous generating unit and the input of main power rectification device respectively；Control
Device is used for the output voltage u for obtaining main power rectification devicedcWith output current idc, the output voltage of asynchronous generating unit and defeated
Go out the DC voltage u of electric current and excitation unitdc1, the output current based on acquired value and main power rectification device
idcWith default short circuit current threshold value IThresholdBetween comparative result excitation unit is controlled accordingly, to cause in idc＜
IThresholdWhen, the output voltage u of excitation unitdc1Stabilization is in default first voltage, the output voltage u of main power rectification devicedcIt is stable
In default second voltage, in idc≥IThresholdWhen, the output voltage u of excitation unitdc1Stabilization is in default first voltage, main power
The output current i of fairingdcIt is stable to be less than the short circuit current threshold value in default current value, the default current value.
The present invention at least has following technique effect：
1st, the excitation part of asynchronous generating unit of the invention separates with main power section so that main power section possesses the short time
Interior resistance to short circuit current characteristic, while excitation part possesses the function of quick adjustment short circuit curve.When short trouble occurs for system,
There is short trouble by monitoring the output current of main power rectification device, judgement in excitation unit, will no longer maintain main power to fill
The DC voltage stability put, but default current value is exported, so that system realizes selective protection；The high current of moment only can
Flow through the stronger main power rectification device of withstanding current capability, without destroying excitation unit, so as to ensure the security of system and
It is quick restorative；
2nd, excitation unit of the invention need to only provide the energy required for asynchronous generating unit excitation, be not required to undertake all load work(
Rate, therefore the power grade of excitation unit is significantly less than main power demand, so as to reduce the cost of system；
3rd, asynchronous generating unit of the invention only realizes the separation of excitation and main power output with one group of winding can, and nothing
Need the multigroup winding of custom-made.
Brief description of the drawings
Fig. 1 shows the asynchronous generator rectifier power system according to an embodiment of the invention suitable for short-circuit protection
Overall theory diagram.
Fig. 2 shows that the present invention is applied to a concrete application example of the asynchronous generator rectifier power system of short-circuit protection
Schematic diagram.
Fig. 3 shows the control principle block diagram of controller according to an embodiment of the invention.
Embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
Refer to Fig. 1.Asynchronous generator rectifier power system according to an embodiment of the invention suitable for short-circuit protection
Including asynchronous generating unit 1, main power rectification device 2, excitation unit 3, filter 4 and controller 6.
The stator winding 121 of asynchronous generating unit 1 is connected with the input of main power rectification device 2, main power rectification dress
2 are put to be used to provide dc source to external loading.
In the present embodiment, asynchronous generating unit 1 includes prime mover 11 and asynchronous generator 12 of variable-speed operation, prime mover
11 are used to drive the rotor of asynchronous generator 12 to rotate.Prime mover 11 possesses variable-speed operation feature, it is possible to achieve under different capacity,
By adjusting rotating speed so that prime mover 11 operates in optimum oil consumption point all the time, so as to reach the effect of energy-saving and emission-reduction.Prime mover 11
Such as the internal combustion engine of variable-speed operation can be used.The rotor of asynchronous generator 12 uses squirrel-cage or Wound-rotor type.Main power rectification
The output end of device 2 is connected by dc switch 7 with dc bus 5.The main power rectification device be uncontrollable rectifier device or
Half-controlled rectifying device, it is made up of rectifier bridge and the electric capacity of voltage regulation for being connected in parallel on rectification bridge output end.Main power rectification device 2 is not using
The cost of control fairing or half-controlled rectifying device, diode or IGCT is lower, and resistance to high current ability is stronger, is more suitable for big
Power operation.Dc switch 7 is using the dc switch with active disjunction and making capacity, such as dc circuit breaker or electronic cutting
Close etc., dc switch 7 is controlled by system resultant fault protection device or other similar devices are controlled, and it is whole to be connected to main power
Flow between device 2 and the dc bus 5 of direct-flow distribution system.
The AC of excitation unit 3 is connected with one end of filter 4, the other end of filter 4 respectively with asynchronous hair
The stator winding 121 of group of motors 1 connects with the input of main power rectification device 2.In the present embodiment, excitation unit 3 includes
Full-controlled rectifier bridge 31, storage capacitor C2 and pre-excitation power supply 33.The AC of full-controlled rectifier bridge 31 and one end of filter 4
It is connected, storage capacitor C2 is connected in parallel on the DC side of full-controlled rectifier bridge 31, and pre-excitation power supply 33 is connected in parallel with storage capacitor C2, uses
Required excitation voltage when asynchronous generating unit is provided and started.
Controller 6 is used for the output voltage u for obtaining main power rectification device 2dcWith output current idc, asynchronous generating unit 1
Output voltage and the DC voltage u of output current and excitation unit 3dc1, based on acquired value and main power rectification
The output current i of device 2dcWith default short circuit current threshold value IThresholdBetween comparative result excitation unit 3 is controlled accordingly
System, to cause in idc＜ IThresholdWhen, the DC voltage u of excitation unit 3dc1It is stable to be filled in default first voltage, main power rectification
Put 2 output voltage udcIt is stable in default second voltage, in idc≥IThresholdWhen, the DC voltage u of excitation unitdc1Stabilization exists
Default first voltage, the output current i of main power rectification device 2dcIt is stable to be less than in default current value, default current value
Short circuit current threshold value.In a kind of specific embodiment, above-mentioned default first voltage for example can be asynchronous generator 12
1.5 times of line voltage.
In idc≥IThresholdWhen, it is meant that system is there occurs short trouble, and after judging short trouble, controller 6 is encouraged by control
The full-controlled rectifier bridge 31 of magnetic device 3, adjust the output current i of main power rectification device 2dcSize, it is met Systematic selection
Property determination requirement.And in the case of system worked well, controller 6 is made by controlling the full-controlled rectifier bridge 31 of excitation unit 3
The output voltage u of main power rectification device 2dcKeep stable, so as to provide steady dc voltage to dc bus 5.
Asynchronous generator rectifier power system according to an embodiment of the invention suitable for short-circuit protection can using separate unit as
Load supplying, can also more parallel connections be system power supply, also can in parallel with other energy-storage systems and power supply unit be system power supply.
In the present embodiment, the stator winding 121 of asynchronous generating unit 1 is made up of m phase windings, per phase winding using mutually shifting
360/m angle connections, main power rectification device 2 are m commutating phase devices, and the full-control type rectifier bridge 31 of excitation unit 3 is controlled entirely for m phases
Rectifier bridge, m=3n, n are positive integer.
In the figure 2 example, the asynchronous generator 12 of asynchronous generating unit 1 is three phase induction generator.Main power rectification
Device 2 is three-phase uncontrollable rectifier device or three-phase half-controlled rectifying device.The full-controlled rectifier bridge 31 of excitation unit 3 is three-phase fully-controlled
Rectifier bridge, filter 4 are made up of three-phase filter inductance.Shown in Fig. 2 three phase induction generator output voltage vabc and
Output current iabc.In the figure 2 example, pre-excitation power supply 33 includes dc source 331 and diode 332, dc source 331
Anode be connected with the positive pole of diode 332, the negative pole of diode 332 is connected with storage capacitor C2 one end, dc source 331
Negative terminal be connected with the storage capacitor C2 other end.When asynchronous generator starts, it is by diode 332 by dc source 331
Full-controlled rectifier bridge 31 provides power supply, so as to provide excitation power supply for asynchronous generator, treats that three phase induction generator output voltage is built
Vertical, during the DC-side Voltage Stabilization of full-controlled rectifier bridge 31, diode 332 will prevent dc source 331 from providing energy again.Diode
332 can also be replaced by controlling switch, asynchronous generator startup control system switch closure, the DC voltage of full-controlled rectifier bridge 31
Steady timing controlled switches off.
Fig. 3 shows the control principle block diagram of controller according to an embodiment of the invention.Controller 6 includes the first direct current
Voltage regulator 61, the second direct current voltage regulator 62, DC current regulator 63, short-circuit judge module 64, selection control mould
Block 65, coordinate transformation module 66, current loop controller 67 and modulation module 68.
First direct current voltage regulator 61 is used for the excitation unit DC voltage u according to acquisitiondc1Filled with given excitation
Put DC voltage U* dc1Comparison, generation DC current active component set-point i* d.Second direct current voltage regulator 62 is used for
According to the main power rectification device output voltage u of acquisitiondcWith given main power rectification device output voltage U* dcComparison, it is raw
Into DC current reactive component set-point i* q.DC current regulator 63 is used to export electricity according to the main power rectification device of acquisition
Flow idcWith given main power rectification device output current I* dcComparison, generation DC current reactive component set-point i* q.It is short
Road judge module 64 is used for the output current i of the main power rectification device of acquisitiondcWith default short circuit current threshold value IThresholdCarry out
Compare.Selection control module 65 is used to optionally control the second DC voltage to adjust according to the comparative result of short-circuit judge module 64
Section device 62 or DC current regulator 63 are run, and the second direct current voltage regulator 62 of output or DC current regulator 63 generate
DC current reactive component set-point i* q；Wherein, if idc＜ IThreshold, select control module 65 to control the second DC voltage to adjust
Section device 62 is run, and exports the DC current reactive component set-point i of the second direct current voltage regulator 62 generation* q, DC current
Adjuster 63 is not run；If idc≥IThresholdWhen, select control module 65 to control DC current regulator 63 to run, and export direct current
The DC current reactive component set-point i that current regulator 63 generates* q, the second direct current voltage regulator 62 do not run.Coordinate becomes
Block 66 is changed the mold for the phase angle according to asynchronous generating unit output voltage, the exchange of the asynchronous generating unit of acquisition is exported
Current transformation is the DC current active component i under rotating coordinate systemdWith DC current reactive component iq.Current loop controller 67
According to DC current active component idWith the DC current active component set-point i of the first direct current voltage regulator 61 generation* d's
Comparison and DC current reactive component iqThe DC current reactive component set-point i exported with selection control module 65* qRatio
Compared with generation voltage adjust instruction.Modulation module 68 is used for phase angle and voltage according to asynchronous generating unit output voltage
Adjust instruction, the pwm signal of each switching device of generation control full-control type rectifier bridge 31.
In the present embodiment, the first direct current voltage regulator 61, the second direct current voltage regulator 62, DC current regulator
63 and current loop controller 67 can use pi regulator.By taking the first direct current voltage regulator 61 as an example, the excitation unit of acquisition
DC voltage udc1With given excitation unit DC voltage U* dc1By the PI of the first direct current voltage regulator 61 after making the difference
Regulation, obtains DC current active component set-point i* d。
Control mode above not limits by way of example only, and controller 6 can also use other control modes.
Asynchronous generator rectifier power system according to an embodiment of the invention suitable for short-circuit protection belongs to peculiar to vessel straight
The power generation part in distribution system is flowed, steady dc voltage is provided for direct-flow distribution system peculiar to vessel, and is possessed and other generatings
The ability of part in parallel operation, when especially possessing short circuit, the rush of current of resistance to instantaneous short circuit and fast recovery of power supply after fixing a breakdown
Ability.
Claims (10)
1. suitable for the asynchronous generator rectifier power system of short-circuit protection, it is characterised in that including asynchronous generating unit, main work(
Rate fairing, excitation unit, filter and controller；
The stator winding of the asynchronous generating unit is connected with the input of the main power rectification device, the main power rectification
Device is used to provide dc source to external loading；
The AC of the excitation unit is connected with one end of the filter, the other end of the filter respectively with institute
The stator winding for stating asynchronous generating unit connects with the input of the main power rectification device；
The controller is used for the output voltage u for obtaining the main power rectification devicedcWith output current idc, the asynchronous generating
The output voltage and output current of unit and the DC voltage u of the excitation unitdc1, based on acquired value and master
The output current i of power rectification devicedcWith default short circuit current threshold value IThresholdBetween comparative result the excitation unit is entered
The corresponding control of row, to cause in idc＜ IThresholdWhen, the output voltage u of excitation unitdc1Stabilization is in default first voltage, main work(
The output voltage u of rate fairingdcIt is stable in default second voltage, in idc≥IThresholdWhen, the output voltage u of excitation unitdc1
Stabilization is in the default first voltage, the output current i of main power rectification devicedcIt is described pre- stably in default current value
If current value be less than the short circuit current threshold value.
2. the asynchronous generator rectifier power system according to claim 1 suitable for short-circuit protection, it is characterised in that institute
Stating excitation unit includes full-controlled rectifier bridge, storage capacitor and pre-excitation power supply；
The AC of the full-controlled rectifier bridge is connected with one end of the filter, and the storage capacitor is connected in parallel on the full control
The DC side of rectifier bridge, the pre-excitation power supply are connected in parallel with the storage capacitor, are started for providing asynchronous generating unit
Shi Suoxu excitation voltage；
The controller is used for the work for controlling the full-control type rectifier bridge.
3. the asynchronous generator rectifier power system according to claim 2 suitable for short-circuit protection, it is characterised in that institute
Stating pre-excitation power supply includes dc source and diode, and the anode of the dc source is connected with the positive pole of the diode, institute
The negative pole for stating diode is connected with one end of the storage capacitor, and the negative terminal of the dc source is another with the storage capacitor
End connection.
4. the asynchronous generator rectifier power system according to claim 2 suitable for short-circuit protection, it is characterised in that institute
Stating controller includes：
First direct current voltage regulator, for the excitation unit DC voltage u according to acquisitiondc1It is straight with given excitation unit
Flow side voltage U* dc1Comparison, generation DC current active component set-point i* d；
Second direct current voltage regulator, for the main power rectification device output voltage u according to acquisitiondcIt is whole with given main power
Flow device output voltage U* dcComparison, generation DC current reactive component set-point i* q；
DC current regulator, for the main power rectification device output current i according to acquisitiondcFilled with given main power rectification
Put output current I* dcComparison, generation DC current reactive component set-point i* q；
Short-circuit judge module, for by the output current i of the main power rectification device of acquisitiondcWith default short circuit current threshold value IThreshold
It is compared；
Control module is selected, for optionally controlling the second DC voltage to adjust according to the comparative result of the short-circuit judge module
Device or DC current regulator operation are saved, and exports the second direct current voltage regulator or the direct current of DC current regulator generation
Flow reactive component set-point i* q；Wherein, if idc＜ IThreshold, select control module to control the operation of the second direct current voltage regulator,
And export the DC current reactive component set-point i of the second direct current voltage regulator generation* qIf idc≥IThresholdWhen, selection control
Module control DC current regulator operation, and export the DC current reactive component set-point i of DC current regulator generation* q；
Coordinate transformation module, for the phase angle according to asynchronous generating unit output voltage, by the asynchronous generating unit of acquisition
Ac output current be transformed to DC current active component i under rotating coordinate systemdWith DC current reactive component iq；
Current loop controller, according to the DC current active component idWith the DC current of the first direct current voltage regulator generation
Active component set-point i* dComparison and the DC current reactive component iqWith the DC current of selection control module output
Reactive component set-point i* qComparison, generate voltage adjust instruction；
Modulation module, for controlling the full-control type rectification according to the phase angle and the voltage adjust instruction, generation
The pwm signal of each switching device of bridge.
5. the asynchronous generator rectifier power system according to claim 4 suitable for short-circuit protection, it is characterised in that institute
State the first direct current voltage regulator, second direct current voltage regulator, the DC current regulator and the electric current loop control
Device processed is pi regulator.
6. the asynchronous generator rectifier power system according to claim 1 or 2 suitable for short-circuit protection, its feature exists
In the main power rectification device is uncontrollable rectifier device or half-controlled rectifying device.
7. the asynchronous generator rectifier power system according to claim 2 suitable for short-circuit protection, the asynchronous generating
The stator winding of unit is made up of m phase windings, and the main power rectification device is m commutating phase devices, the full-control type of excitation unit
Rectifier bridge is m phase full-controlled rectifier bridges, and m=3n, n are positive integer.
8. the asynchronous generator rectifier power system according to claim 1 suitable for short-circuit protection, it is characterised in that institute
Stating asynchronous generating unit includes prime mover and asynchronous generator of variable-speed operation, and described prime mover is used to drive the asynchronous generating
The rotor of machine rotates.
9. the asynchronous generator rectifier power system according to claim 8 suitable for short-circuit protection, it is characterised in that institute
The rotor for stating asynchronous generator uses squirrel-cage or Wound-rotor type.
10. the asynchronous generator rectifier power system according to claim 1 suitable for short-circuit protection, it is characterised in that
The output end of the main power rectification device is connected by dc switch with the dc bus.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711412357.0A CN107888118B (en) | 2017-12-23 | 2017-12-23 | Rectifying power supply system of asynchronous generator suitable for short-circuit protection |
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|---|---|---|---|
| CN201711412357.0A CN107888118B (en) | 2017-12-23 | 2017-12-23 | Rectifying power supply system of asynchronous generator suitable for short-circuit protection |
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| CN107888118A true CN107888118A (en) | 2018-04-06 |
| CN107888118B CN107888118B (en) | 2023-08-25 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109193567A (en) * | 2018-09-30 | 2019-01-11 | 深圳市汇川技术股份有限公司 | Shorted to earth guard method, electric machine controller and computer readable storage medium |
| CN111064403A (en) * | 2019-12-27 | 2020-04-24 | 绍兴市上虞区理工高等研究院 | Circuit control method and device based on excitation system |
| CN114079280A (en) * | 2020-08-11 | 2022-02-22 | 中国船舶重工集团公司第七一一研究所 | Power supply device and ship with same |
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| CN114079280A (en) * | 2020-08-11 | 2022-02-22 | 中国船舶重工集团公司第七一一研究所 | Power supply device and ship with same |
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| Publication number | Publication date |
|---|---|
| CN107888118B (en) | 2023-08-25 |
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