CN207638589U - Asynchronous generator rectifier power system suitable for short-circuit protection - Google Patents
Asynchronous generator rectifier power system suitable for short-circuit protection Download PDFInfo
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- CN207638589U CN207638589U CN201721822234.XU CN201721822234U CN207638589U CN 207638589 U CN207638589 U CN 207638589U CN 201721822234 U CN201721822234 U CN 201721822234U CN 207638589 U CN207638589 U CN 207638589U
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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 connect with main power rectification device.The exchange side of excitation unit is connected with one end of filter, and the other end of filter is connect with the input terminal of the stator winding of asynchronous generating unit and main power rectification device respectively.The control signal of the output end of controller and the full-control type rectifier bridge of excitation unit connects, and controller is used to obtain the output current i of main power rectification devicedc, in the output current i of main power rectification devicedcMore than or equal to preset short circuit current threshold value IThresholdWhen pass through control full-control type rectifier bridge reduce idc, so that idcIt is reduced to short circuit current threshold value IThresholdBelow.The selectivity of direct-flow distribution system and quickly restorative may be implemented when short circuit on the basis of not influencing generator commutation performance in the utility model.
Description
Technical field
The utility model is related to DC grid distribution system more particularly to a kind of asynchronous generator power supply systems.
Background technology
As electronic technology development is rapid, shipbuilding industry increasingly pays close attention to application of the DC grid on ship, exchange hair
Motor rectifier power system is made of alternating current generating sets, fairing, DC bus, such system good, body with stability
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 constitute 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 busbar
Selective protection when road and the contradiction between the fragility of power electronic equipment, become the bottleneck problem of the System Development.
Invention content
The technical problem to be solved by the utility model is to provide a kind of asynchronous generator suitable for short-circuit protection is whole
Power supply system is flowed, which solve in direct-flow distribution system, selective protection and power electronic equipment when DC bus short circuit
Direct-flow distribution system when short circuit may be implemented on the basis of not influencing generator commutation performance in contradiction between fragility
It is selective and quickly restorative.
In order to solve the above technical problems, technical solution adopted in the utility model is：
It is filled suitable for the asynchronous generator rectifier power system of short-circuit protection, including asynchronous generating unit, main power rectification
It sets, excitation unit, filter and controller；The stator winding of asynchronous generating unit and the input terminal of main power rectification device connect
It connects, main power rectification device is used to provide DC power supply to external loading；The exchange side of excitation unit and one end of filter
It is connected, the other end of filter connects with the input terminal of the stator winding of asynchronous generating unit and main power rectification device respectively
It connects；Excitation unit includes full-controlled rectifier bridge, storage capacitor and pre-excitation power supply；The exchange side and filter of full-controlled rectifier bridge
One end be connected, storage capacitor is connected in parallel on the DC side of full-controlled rectifier bridge, and pre-excitation power supply is connected in parallel with storage capacitor, is used for
Excitation voltage required when asynchronous generating unit starts is provided；The control signal of the output end and full-control type rectifier bridge of controller
Connection；Controller is used to obtain the output current i of main power rectification devicedc, and the output of more main power rectification device in real time
Electric current idcWith preset short circuit current threshold value IThreshold, in idc≥IThresholdWhen, reduce main power rectification dress by controlling full-control type rectifier bridge
The output current i setdc, so that the output current i of main power rectification devicedcIt is reduced to short circuit current threshold value IThresholdBelow.
The utility model at least has the following technical effects：
1, the excitation part of the asynchronous generating unit of the utility model is detached with main power section so that main power section tool
Resistance to short circuit current characteristic in the standby short time, while excitation part has the function of quickly adjustment short circuit curve.When system generation is short
When the failure of road, excitation unit judges short trouble occur by the output current of the main power rectification device of monitoring, is encouraged by control
The full-control type rectifier bridge of magnetic part so that the output current of main power rectification device is reduced to preset short circuit current threshold value hereinafter, with
Selective protection is realized for system；The high current of moment can only flow through the stronger main power rectification device of withstanding current capability, without
Excitation unit can be destroyed, to ensure system safety and quickly it is restorative；
2, the excitation unit of the utility model need to only provide asynchronous generating unit excitation required energy, be not required to undertake institute
There is bearing power, therefore the power grade of excitation unit is significantly less than main power demand, to reduce the cost of system；
3, the asynchronous generating unit of the utility model only can realize point of the excitation with main power output with one group of winding
From without the multigroup winding of custom-made.
Description of the drawings
Fig. 1 shows the asynchronous generator commutation supply voltage system suitable for short-circuit protection according to one embodiment of the utility model
The whole functional block diagram of system.
Be suitable for the asynchronous generator rectifier power system of short-circuit protection Fig. 2 shows the utility model one specifically answers
The schematic diagram of use-case.
Specific implementation mode
The utility model is described in detail in the following with reference to the drawings and specific embodiments.
It please refers to Fig.1.According to the asynchronous generator commutation supply voltage suitable for short-circuit protection of one embodiment of the utility model
System includes 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 connect with the input terminal of main power rectification device 2, main power rectification dress
2 are set for providing DC power supply 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 for driving the rotor of asynchronous generator 12 to rotate.Prime mover 11 has variable-speed operation feature, may be implemented under different capacity,
By adjusting rotating speed so that prime mover 11 operates in optimum oil consumption point always, to achieve the effect that 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 connect by dc switch 7 with DC bus 5.The main power rectification device be uncontrollable rectifier device or
Half-controlled rectifying device is made 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 thyristor 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 protective device or other similar devices are controlled, and it is whole to be connected to main power
It flows between device 2 and the DC bus 5 of direct-flow distribution system.
The exchange side 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 motor group 1 is connected with the input terminal 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.One end of the exchange side and filter 4 of full-controlled rectifier bridge 31
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 is started.
The output end of controller 6 is connect with the control signal of full-control type rectifier bridge 31.Controller 6 is for obtaining main power
The output current i of fairing 2dc, and the output current i of more main power rectification device in real timedcWith preset short circuit current threshold
Value IThreshold, in idc≥IThresholdWhen, reduce the output current i of main power rectification device by controlling full-control type rectifier bridgedc, so that main work(
The output current i of rate fairingdcIt is reduced to short circuit current threshold value IThresholdBelow.
The output current i of main power rectification device 2dcIt can be detected and be obtained by corresponding detection sensor, and be sent to control
Device 6 processed.In idc≥IThresholdWhen, it is meant that short trouble has occurred in system, and after judging short trouble, controller 6 is by controlling excitation
The full-controlled rectifier bridge 31 of device 3 adjusts the output current i of main power rectification device 2dcSize, make main power rectification device 2
Output current is reduced to preset short circuit current threshold value hereinafter, it is made to meet Systematic selection determination requirement.Controller 6 can pass through
Adjusting output reduces the output current i of main power rectification device 2 to the duty ratio of the pwm control signal of full-controlled rectifier bridge 31dc。
It can be single according to the asynchronous generator rectifier power system suitable for short-circuit protection of one embodiment of the utility model
Platform is 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 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 that m phases are controlled entirely
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 of three-phase filter inductance.In the figure 2 example, pre-excitation power supply 33 includes DC power supply 331
With diode 332, the anode of DC power supply 331 is connect with the anode of diode 332, the cathode and storage capacitor of diode 332
One end of C2 connects, and the negative terminal of DC power supply 331 is connect with the other end of storage capacitor C2.When asynchronous generator starts, by straight
Galvanic electricity source 331 is that full-controlled rectifier bridge 31 provides power supply by diode 332, to provide excitation power supply for asynchronous generator, is waited for
Three phase induction generator output voltage is established, and when the DC-side Voltage Stabilization of full-controlled rectifier bridge 31, diode 332 will prevent direct current
Power supply 331 provides energy again.Diode 332 can also be closed by control switch in place, asynchronous generator startup control system switch,
Control switch disconnects when the DC-side Voltage Stabilization of full-controlled rectifier bridge 31.
Belong to ship according to the asynchronous generator rectifier power system suitable for short-circuit protection of one embodiment of the utility model
With the power generation part in direct-flow distribution system, steady dc voltage is provided for direct-flow distribution system peculiar to vessel, and have and other
The ability of power generation part parallel running, when especially having short circuit, fast quick-recovery after the rush of current of resistance to instantaneous short circuit and debugging
The ability of power supply.
Claims (7)
1. the asynchronous generator rectifier power system suitable for short-circuit protection, which is characterized in that including asynchronous generating unit, main work(
Rate fairing, excitation unit, filter and controller；
The stator winding of the asynchronous generating unit is connect with the input terminal of the main power rectification device, the main power rectification
Device is used to provide DC power supply to external loading；
The exchange side 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 is connected with the input terminal of the main power rectification device；
The excitation unit includes full-controlled rectifier bridge, storage capacitor and pre-excitation power supply；The exchange side of the full-controlled rectifier bridge
It is connected with one end of the filter, the storage capacitor is connected in parallel on the DC side of the full-controlled rectifier bridge, the pre-excitation
Power supply is connected in parallel with the storage capacitor, for providing excitation voltage required when asynchronous generating unit starts；
The output end of the controller is connect with the control signal of the full-controlled rectifier bridge；The controller is described for obtaining
The output current i of main power rectification devicedc, and the output current i of more main power rectification device in real timedcWith preset short circuit
Current threshold IThreshold, in idc≥IThresholdWhen, reduce the output current i of main power rectification device by controlling full-controlled rectifier bridgedc, so that
The output current i of main power rectification devicedcIt is reduced to short circuit current threshold value IThresholdBelow.
2. the asynchronous generator rectifier power system according to claim 1 suitable for short-circuit protection, which is characterized in that institute
It includes DC power supply and diode to state pre-excitation power supply, and the anode of the DC power supply is connect with the anode of the diode, institute
The cathode for stating diode is connect with one end of the storage capacitor, and the negative terminal of the DC power supply is another with the storage capacitor
End connection.
3. the asynchronous generator rectifier power system according to claim 1 or 2 suitable for short-circuit protection, feature exists
In the main power rectification device is uncontrollable rectifier device or half-controlled rectifying device.
4. the asynchronous generator rectifier power system according to claim 1 suitable for short-circuit protection, the asynchronous generating
The stator winding of unit is made of m phase windings, and the main power rectification device is m commutating phase devices, and the control entirely of excitation unit is whole
Stream bridge is m phase full-controlled rectifier bridges, and m=3n, n are positive integer.
5. the asynchronous generator rectifier power system according to claim 1 suitable for short-circuit protection, which is characterized in that institute
Prime mover and asynchronous generator that asynchronous generating unit includes variable-speed operation are stated, described prime mover is for driving the asynchronous generating
The rotor of machine rotates.
6. the asynchronous generator rectifier power system according to claim 5 suitable for short-circuit protection, which is characterized in that institute
The rotor for stating asynchronous generator uses squirrel-cage or Wound-rotor type.
7. the asynchronous generator rectifier power system according to claim 1 suitable for short-circuit protection, which is characterized in that institute
The output end for stating main power rectification device is connect by dc switch with DC bus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721822234.XU CN207638589U (en) | 2017-12-23 | 2017-12-23 | Asynchronous generator rectifier power system suitable for short-circuit protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721822234.XU CN207638589U (en) | 2017-12-23 | 2017-12-23 | Asynchronous generator rectifier power system suitable for short-circuit protection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207638589U true CN207638589U (en) | 2018-07-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721822234.XU Active CN207638589U (en) | 2017-12-23 | 2017-12-23 | Asynchronous generator rectifier power system suitable for short-circuit protection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207638589U (en) |
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2017
- 2017-12-23 CN CN201721822234.XU patent/CN207638589U/en active Active
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Address after: 201108 Shanghai city Minhang District Huaning Road No. 3111 Patentee after: The 711 Research Institute of China Shipbuilding Corp. Address before: 201108 Shanghai city Minhang District Huaning Road No. 3111 Patentee before: Shanghai Marine Diesel Engine Research Institute |