CN107147104A - The voltage pulsation recovery device and restoration methods of a kind of direct-flow distribution system - Google Patents
The voltage pulsation recovery device and restoration methods of a kind of direct-flow distribution system Download PDFInfo
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- CN107147104A CN107147104A CN201710608755.3A CN201710608755A CN107147104A CN 107147104 A CN107147104 A CN 107147104A CN 201710608755 A CN201710608755 A CN 201710608755A CN 107147104 A CN107147104 A CN 107147104A
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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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/10—Parallel operation of dc sources
- H02J1/102—Parallel operation of dc sources being switching converters
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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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/14—Balancing the load in a network
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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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/10—Parallel operation of dc sources
- H02J1/106—Parallel operation of dc sources for load balancing, symmetrisation, or sharing
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses the voltage pulsation recovery device and restoration methods of a kind of direct-flow distribution system, the recovery device specifically includes energy storage device, inverter circuit, biphase rectification circuit and controller；The direct current compensation voltage that energy storage device is provided is converted into by the adjustable alternating voltage of dutycycle by the inverter circuit, the alternating voltage that inverter circuit is exported is changed into the DC voltage of direction-agile by biphase rectification circuit, and then pass through the size for the duty cycle adjustment recovery device output voltage for adjusting alternating voltage, change the direction of recovery device output voltage by changing the direction of biphase rectification circuit output DC voltage, the recovery device of the present invention can provide the adjustable DC voltage of size and Orientation to recover the voltage pulsation in direct-flow distribution system for direct-flow distribution system, it ensure that the quality for the direct current energy that direct-flow distribution system is provided.
Description
Technical field
The present invention relates to DC distribution field, the voltage pulsation recovery device of more particularly to a kind of direct-flow distribution system and extensive
Compound method.
Background technology
In recent years, DC distribution technology is fast-developing, and direct current supply shows huge superiority.But it is due to current straight
Flow the immature of distribution theory and technology so that the quality problems of voltage pulsation occurs in Novel DC distribution Netease, specifically includes
Overvoltage, voltage swells, voltage dip and Voltage Drop etc., have a strong impact on the normal work of direct-flow electricity utilization apparatus, and right at present
The research of direct current energy quality controlling equipment is less, lacks special direct current energy quality problems abatement equipment.
The content of the invention
The invention aims to recover the voltage pulsation in direct-flow distribution system, it is ensured that the direct current of direct-flow distribution system
There is provided the voltage pulsation recovery device and restoration methods of a kind of direct-flow distribution system for the quality of electric energy.
To achieve the above object, the invention provides following scheme：
A kind of voltage pulsation recovery device of direct-flow distribution system, the recovery device is series at direct-flow distribution system and negative
Between load, the recovery device includes energy storage device, inverter circuit, biphase rectification circuit and controller；
The output end of the energy storage device is connected with the input of the inverter circuit, for direct current compensation voltage to be inputted
Into the inverter circuit；
The output end of the inverter circuit is connected with the input of the biphase rectification circuit, with by the DC compensation electricity
Pressure is converted into the adjustable alternating voltage of dutycycle, and the alternating voltage is inputted into the biphase rectification circuit；
The output end of the biphase rectification circuit is series between the direct-flow distribution system and the load；For by institute
State alternating voltage and be converted into the adjustable DC voltage in direction, and the direct-flow distribution system is given by the direct voltage output, with
Recover the fluctuation of the direct-flow distribution system output voltage；
The controller is connected with the control end of the inverter circuit, the output alternating current for controlling the inverter circuit
Press and control the dutycycle of the output AC voltage of the inverter circuit, control of the controller also with the biphase rectification circuit
End connection processed, the direction for controlling the biphase rectification circuit output DC voltage.
Optionally, the recovery device also include voltage collecting device, the input of the voltage collecting device with it is described
Load is in parallel, and the signal output part of the voltage collecting device is connected with the controller, for gathering the DC distribution system
The load voltage of system output, and the load voltage is inputed into the controller；
The controller is additionally operable to determine the size and Orientation of the load voltage ripple, and root according to the load voltage
The dutycycle of the inverter circuit output AC voltage is controlled according to the size of voltage pulsation, is handed over adjusting the inverter circuit output
The size of the virtual value of voltage is flowed, and biphase rectification circuit changes biphase rectification circuit according to the direction controlling of voltage pulsation
Export the direction of DC voltage.
Optionally, the recovery device also includes transformer, and the transformer is arranged at the inverter circuit and described double
To between rectification circuit, for being boosted to the alternating voltage that the inverter circuit is exported, and by the alternating voltage after boosting
Input to the biphase rectification circuit.
Optionally, the recovery device also includes filter circuit, and the filter circuit is arranged at the inverter circuit and institute
State between transformer, for being filtered to the voltage that the inverter circuit is exported, and by filtered alternating voltage input to
The transformer.
Optionally, the biphase rectification circuit includes full bridge rectifier and direction changes circuit；
The input of the full bridge rectifier is connected with the output end of the transformer, the full bridge rectifier it is defeated
The input for going out end with direction change circuit is connected, for the convert alternating current that exports the transformer into direct current
Pressure, and the DC voltage is inputted to direction change circuit；
The output end that the direction changes circuit is series between the direct-flow distribution system and the load, the direction
The control end for changing circuit is connected with the controller, the side for changing the DC voltage under the control of the controller
To, and nyctitropic DC voltage will be changed input to the output end of the direct-flow distribution system, to recover the DC distribution system
The fluctuation of system output voltage.
Optionally, the direction change circuit be by the first full-control type semiconductor devices, the second full-control type semiconductor devices,
The full bridge inverter of 3rd full-control type semiconductor devices, the 4th full-control type semiconductor devices composition, wherein, the first full-control type half
Conductor device and the second full-control type semiconductor devices constitute the first bridge arm, and the first full-control type semiconductor devices is upper for the first bridge arm
Bridge arm, the second full-control type semiconductor devices are the lower bridge arm of the first bridge arm, the 3rd full-control type semiconductor devices and the 4th full-control type
Semiconductor devices constitutes the second bridge arm, and the 3rd full-control type semiconductor devices is partly led for upper bridge arm, the 4th full-control type of the second bridge arm
Body device is the lower bridge arm of the second bridge arm, and the first full-control type semiconductor devices and the 4th full-control type semiconductor devices are led
Logical, when the second full-control type semiconductor devices and the 3rd full-control type semiconductor devices cut-off, the direction changes circuit
The direction of DC voltage is exported for just, the second full-control type semiconductor devices and the 3rd full-control type semiconductor devices are led
Logical, when the first full-control type semiconductor devices and the 4th full-control type semiconductor devices cut-off, the direction changes circuit
It is negative to export the direction of DC voltage.
A kind of voltage pulsation restoration methods of direct-flow distribution system, the restoration methods are applied to the recovery device, bag
Include following steps：
Energy storage device provides direct current compensation voltage；
Inverter circuit under the control of the controller, the direct current compensation voltage is converted into setting the alternating current of dutycycle
Pressure；
The alternating voltage is converted into the adjustable direct current in direction by biphase rectification circuit under the control of the controller
Pressure, and by the output end of the DC voltage input direct-flow distribution system, to recover the direct-flow distribution system output electricity
The fluctuation of pressure.
Optionally, in inverter circuit under the control of the controller, the direct current compensation voltage is converted into setting dutycycle
Alternating voltage before, the restoration methods also comprise the following steps：
Voltage collecting device gathers the load voltage of the direct-flow distribution system output；
The controller is compared the load voltage with load voltage value, determine the load voltage ripple direction and
Size；
The controller calculates the dutycycle of the inverter circuit output AC voltage according to the size of load voltage ripple；
The controller determines the side of the biphase rectification circuit output DC voltage according to the direction of load voltage ripple
To.
The specific embodiment provided according to the present invention, the invention discloses following technique effect：
The invention discloses the voltage pulsation recovery device and restoration methods of a kind of direct-flow distribution system, the recovery device
Specifically include energy storage device, inverter circuit, biphase rectification circuit and controller；Energy storage device is provided by the inverter circuit
Direct current compensation voltage be converted into the adjustable alternating voltage of dutycycle, the exchange for exporting inverter circuit by biphase rectification circuit
Voltage changes into the DC voltage of direction-agile, and then by adjusting the duty cycle adjustment recovery device output voltage of alternating voltage
Size, changes the direction of recovery device output voltage, the present invention by changing the direction of biphase rectification circuit output DC voltage
Recovery device the adjustable DC voltage of size and Orientation can be provided for direct-flow distribution system to recover in direct-flow distribution system
Voltage pulsation, it is ensured that the quality for the direct current energy that direct-flow distribution system is provided.
Brief description of the drawings
In order to illustrate the embodiments of the present invention more clearly, accompanying drawing required in embodiment will be briefly described below.
It is clear that drawings discussed below is only one embodiment of the present of invention, for those of ordinary skill in the art,
On the premise of not paying creative work, other accompanying drawings can also be obtained according to this accompanying drawing.
A kind of circuit structure diagram of the voltage pulsation recovery device for direct-flow distribution system that Fig. 1 provides for the present invention；
A kind of flow chart of the voltage pulsation restoration methods for direct-flow distribution system that Fig. 2 provides for the present invention；
A kind of control of the voltage pulsation restoration methods for direct-flow distribution system that Fig. 3 provides for the present invention exports DC voltage
Direction flow chart；
A kind of voltage oscillogram of the voltage pulsation restoration methods for direct-flow distribution system that Fig. 4 provides for the present invention；
Wherein, 1 is energy storage device, and 2 be inverter circuit, and 3 be filter circuit, and 4 be transformer, and 5 be biphase rectification circuit, 6
It is voltage collecting device for controller, 7, figure a is the oscillogram of analog DC distribution system output voltage, figure b is recovery device
The oscillogram of output voltage, figure c is the oscillogram of the load voltage after adjustment.
Embodiment
It is an object of the present invention to provide the voltage pulsation recovery device and restoration methods of a kind of direct-flow distribution system, to recover straight
Flow the voltage pulsation in distribution system, it is ensured that the quality of the direct current energy of direct-flow distribution system.
To enable above-mentioned purpose of the present invention, feature and advantage more obvious understandable, below in conjunction with the accompanying drawings and specific implementation
Mode is described in further detail to this technology invention.
As shown in figure 1, the invention provides a kind of voltage pulsation recovery device of direct-flow distribution system, the recovery device
It is series between direct-flow distribution system and load, the recovery device includes energy storage device 1, inverter circuit 2, biphase rectification circuit
5 and controller 6；
The output end of the energy storage device 1 is connected with the input of the inverter circuit 2, for direct current compensation voltage is defeated
Enter into the inverter circuit；
The output end of the inverter circuit 2 is connected with the input of the biphase rectification circuit 5, with by the DC compensation
Voltage conversion is inputted into the biphase rectification circuit 5 into the adjustable alternating voltage of dutycycle, and by the alternating voltage；
The output end of the biphase rectification circuit 5 is series between the direct-flow distribution system and the load；For inciting somebody to action
The alternating voltage is converted into the adjustable DC voltage in direction, and gives the direct-flow distribution system by the direct voltage output,
To recover the fluctuation of the direct-flow distribution system output voltage；
The controller 6 is connected with the control end of the inverter circuit, for controlling the output of the inverter circuit 2 to exchange
Voltage and control the inverter circuit 2 output AC voltage dutycycle, the controller 6 also with the biphase rectification circuit
Control end connection, the direction for controlling the biphase rectification circuit output DC voltage.
Optionally, the recovery device also includes voltage collecting device 7, the input of the voltage collecting device 7 and institute
State load in parallel, the signal output part of the voltage collecting device 7 is connected with the controller 6, matched somebody with somebody for gathering the direct current
The load voltage of electric system output, and the load voltage is inputed into the controller 6；
The controller 6 is additionally operable to determine the size and Orientation of the load voltage ripple according to the load voltage, and
The dutycycle of the output AC voltage of inverter circuit 2 is controlled according to the size of voltage pulsation, it is defeated to adjust the inverter circuit
Go out the size of the virtual value of alternating voltage, and the biphase rectification circuit 5 according to the direction controlling of voltage pulsation changes two-way whole
Current circuit 5 exports the direction of DC voltage.
Optionally, the recovery device also includes transformer 4, and the transformer 4 is arranged at the inverter circuit 2 and described
Between biphase rectification circuit 5, for being boosted to the alternating voltage that the inverter circuit 2 is exported, and by the exchange after boosting
Control source is to the biphase rectification circuit 4.
Optionally, the recovery device also include filter circuit 3, the filter circuit 3 be arranged at the inverter circuit 2 with
Between the transformer 4, for being filtered to the voltage that the inverter circuit 2 is exported, and filtered alternating voltage is defeated
Enter to the transformer 4.
Optionally, the biphase rectification circuit includes full bridge rectifier 51 and direction changes circuit 52；
The input of the full bridge rectifier 51 is connected with the output end of the transformer 4, the full bridge rectifier
The input that 51 output end changes circuit 52 with the direction is connected, for the convert alternating current for exporting the transformer 4
Inputted into DC voltage, and by the DC voltage to direction change circuit 52；The full bridge rectifier 51 is by four
Full-control type semiconductor devices is constituted, and the full-control type semiconductor devices is IGBT or MOSFET；
Specifically, the full bridge rectifier 51 can also be replaced by diode full bridge rectifier, for high frequency full-bridge
Rectification；
The output end that the direction changes circuit 52 is series between the direct-flow distribution system and the load, the side
It is connected to the control end for changing circuit 52 with the controller 6, for changing the direct current under the control of the controller 6
The direction of pressure, and nyctitropic DC voltage will be changed input to the output end of the direct-flow distribution system, to recover the direct current
The fluctuation of distribution system output voltage.
Optionally, it is by the first full-control type semiconductor devices, the second full-control type semiconductor device that the direction, which changes circuit 52,
Part, the 3rd full-control type semiconductor devices, the full bridge inverter of the 4th full-control type semiconductor devices composition, wherein, the first full control
Type semiconductor devices and the second full-control type semiconductor devices constitute the first bridge arm, and the first full-control type semiconductor devices is the first bridge arm
Upper bridge arm, the lower bridge arm that the second full-control type semiconductor devices is the first bridge arm, the 3rd full-control type semiconductor devices and the 4th complete
Control type semiconductor devices constitutes the second bridge arm, and the 3rd full-control type semiconductor devices is upper bridge arm, the 4th full-control type of the second bridge arm
Semiconductor devices is the lower bridge arm of the second bridge arm, the first full-control type semiconductor devices and the 4th full-control type semiconductor device
Part is turned on, and when the second full-control type semiconductor devices and the 3rd full-control type semiconductor devices cut-off, the direction changes
The direction of circuit output DC voltage is just the second full-control type semiconductor devices and the 3rd full-control type semiconductor devices
When conducting, the first full-control type semiconductor devices and the 4th full-control type semiconductor devices cut-off, the direction changes electricity
The direction of road output DC voltage is negative.The full-control type semiconductor devices is IGBT or MOSFET.
Present invention also offers a kind of voltage pulsation restoration methods of direct-flow distribution system, as shown in Fig. 2 as a kind of real
Mode is applied, the restoration methods are applied to the recovery device, comprised the following steps：
Step 201 energy storage device provides direct current compensation voltage；
Step 202 inverter circuit under the control of the controller, the direct current compensation voltage is converted into set dutycycle
Alternating voltage；
It is adjustable that step 203 biphase rectification circuit is converted into direction under the control of the controller, by the alternating voltage
DC voltage, and the DC voltage is inputted to the output end of the direct-flow distribution system, to recover the DC distribution system
The fluctuation of system output voltage.
Optionally, described in step 202 in inverter circuit under the control of the controller, the direct current compensation voltage is converted into
Before the alternating voltage for setting dutycycle, the restoration methods also comprise the following steps：
Voltage collecting device gathers the load voltage of the direct-flow distribution system output；
The controller is compared the load voltage with load voltage value, determine the load voltage ripple direction and
Size；
The controller calculates the dutycycle of the inverter circuit output AC voltage according to the size of load voltage ripple；
The controller determines the side of the biphase rectification circuit output DC voltage according to the direction of load voltage ripple
To.
As shown in figure 3, the controller determines that the biphase rectification circuit output is straight according to the direction of load voltage ripple
Flowing the specific steps in the direction of voltage includes：
Step 301 voltage collecting device gathers the load voltage Uo of the direct-flow distribution system output；
Step 302 controller is compared according to load voltage Uo with rated voltage, by judging whether load voltage is less than volume
The difference of voltage and the load voltage and rated voltage is determined more than the first setting value, to judge whether load voltage falls, is obtained
To the first judged result；If the first judged result is yes, step 304 is performed, if the first judged result is no, step is performed
303；First setting value is 5%；
Step 303 controller is compared according to load voltage Uo with rated voltage, by judging whether load voltage is more than volume
The difference of voltage and the load voltage and rated voltage is determined more than the second setting value, obtains the second judged result；If second sentences
Disconnected result is yes, then performs step 305, if the second judged result is no, return to step 301；Second setting value is
5%；
The the first full-control type semiconductor devices and the 4th full-control type half of controller control biphase rectification circuit described in step 304
Conductor device is turned on, the second full-control type semiconductor devices and the cut-off of the 3rd full-control type semiconductor devices, makes the biphase rectification electricity
Road exports positive recovery voltage；
Second full-control type semiconductor devices of controller control biphase rectification circuit described in step 305 and the 3rd full control
Type semiconductor devices is turned on, the first full-control type semiconductor devices and the 4th full-control type semiconductor devices cut-off, makes institute
State the negative recovery voltage of biphase rectification circuit output.
As shown in figure 4, figure a is the oscillogram of analog DC distribution system output voltage, analog DC distribution system occurs
Voltage Drop and overvoltage phenomenon of the failure, fall in 0.1s, fall depth for 60% (300V), drop-out time is lasting
300ms, occurs overvoltage 40% (200V), duration 300ms in 0.6s；Scheme the waveform that b is recovery device output voltage
Figure, the given threshold that recovery device starts is the 5% of system nominal voltage, i.e. direct-flow distribution system voltage magnitude falls or excessively electric
Start when pressure is more than 25V, positive voltage is exported in 0.1s, amplitude is 300V, and the duration is 300ms, export negative in 0.6s
Voltage, amplitude is 200V, duration 300ms；Scheme oscillograms of the c for the load voltage after adjustment, it is seen that load voltage is stable,
The apparatus and method voltage output that the present invention is provided is stable, fast response time, and complete realizes voltage compensation and suppression function.
The specific embodiment provided according to the present invention, the invention discloses following technique effect：
The invention discloses the voltage pulsation recovery device and restoration methods of a kind of direct-flow distribution system, the recovery device
Specifically include energy storage device, inverter circuit, biphase rectification circuit and controller；Energy storage device is provided by the inverter circuit
Direct current compensation voltage be converted into the adjustable alternating voltage of dutycycle, the exchange for exporting inverter circuit by biphase rectification circuit
Voltage changes into the DC voltage of direction-agile, and then by adjusting the duty cycle adjustment recovery device output voltage of alternating voltage
Size, changes the direction of recovery device output voltage, the present invention by changing the direction of biphase rectification circuit output DC voltage
Recovery device the adjustable DC voltage of size and Orientation can be provided for direct-flow distribution system to recover in direct-flow distribution system
Voltage pulsation, it is ensured that the quality for the direct current energy that direct-flow distribution system is provided.
The embodiment of each in this specification is described by the way of progressive, and what each embodiment was stressed is and other
Between the difference of embodiment, each embodiment identical similar portion mutually referring to.For system disclosed in embodiment
For, because it is corresponded to the method disclosed in Example, so description is fairly simple, related part is said referring to method part
It is bright.
Specific case used herein is set forth to technical principle, embodiment, and the explanation of above example is
In order to help to understand the technology of the present invention method and core concept, the embodiment of description is only the individual example of the present invention, is not all of
Embodiment.Based on the embodiment of the present invention, what those of ordinary skill in the art were obtained under the premise of creative work is not made
Every other embodiment, belongs to the scope of the present invention.
Claims (8)
1. the voltage pulsation recovery device of a kind of direct-flow distribution system, it is characterised in that the recovery device is series at direct current and matched somebody with somebody
Between electric system and load, the recovery device includes energy storage device, inverter circuit, biphase rectification circuit and controller；
The output end of the energy storage device is connected with the input of the inverter circuit, for direct current compensation voltage to be inputted to institute
State in inverter circuit；
The output end of the inverter circuit is connected with the input of the biphase rectification circuit, is turned with by the direct current compensation voltage
Change the adjustable alternating voltage of dutycycle into, and the alternating voltage is inputted into the biphase rectification circuit；
The output end of the biphase rectification circuit is series between the direct-flow distribution system and the load；For being handed over described
Voltage conversion is flowed into the adjustable DC voltage in direction, and gives the direct-flow distribution system by the direct voltage output, to recover
The fluctuation of the direct-flow distribution system output voltage；
The controller is connected with the control end of the inverter circuit, for controlling the output AC voltage of the inverter circuit simultaneously
Control the dutycycle of the output AC voltage of the inverter circuit, control end of the controller also with the biphase rectification circuit
Connection, the direction for controlling the biphase rectification circuit output DC voltage.
2. recovery device according to claim 1, it is characterised in that the recovery device also includes voltage collecting device,
The input of the voltage collecting device is in parallel with the load, the signal output part of the voltage collecting device and the control
Device is connected, and for gathering the load voltage of the direct-flow distribution system output, and the load voltage is inputed into the control
Device；
The controller is additionally operable to determine the size and Orientation of the load voltage ripple according to the load voltage, and according to electricity
The size of pressure fluctuation controls the dutycycle of the inverter circuit output AC voltage, to adjust the inverter circuit output alternating current
The size of the virtual value of pressure, and biphase rectification circuit changes biphase rectification circuit output according to the direction controlling of voltage pulsation
The direction of DC voltage.
3. recovery device according to claim 1, it is characterised in that the recovery device also includes transformer, the change
Depressor is arranged between the inverter circuit and the biphase rectification circuit, for the alternating voltage exported to the inverter circuit
Boosted, and the alternating voltage after boosting is inputted to the biphase rectification circuit.
4. recovery device according to claim 3, it is characterised in that the recovery device also includes filter circuit, described
Filter circuit is arranged between the inverter circuit and the transformer, for being filtered to the voltage that the inverter circuit is exported
Ripple, and filtered alternating voltage is inputted to the transformer.
5. the recovery device according to claim 1 or 3, it is characterised in that the biphase rectification circuit includes full-bridge rectification
Circuit and direction change circuit；
The input of the full bridge rectifier is connected with the output end of the transformer, the output end of the full bridge rectifier
The input for changing circuit with the direction is connected, for the convert alternating current that exports the transformer into DC voltage, and
The DC voltage is inputted to the direction and changes circuit；
The output end that the direction changes circuit is series between the direct-flow distribution system and the load, and the direction changes
The control end of circuit is connected with the controller, the direction for changing the DC voltage under the control of the controller,
And nyctitropic DC voltage will be changed input to the output end of the direct-flow distribution system, it is defeated to recover the direct-flow distribution system
Go out the fluctuation of voltage.
6. recovery device according to claim 5, it is characterised in that it is by the first full-control type half that the direction, which changes circuit,
What conductor device, the second full-control type semiconductor devices, the 3rd full-control type semiconductor devices, the 4th full-control type semiconductor devices were constituted
Full bridge inverter, wherein, the first full-control type semiconductor devices and the second full-control type semiconductor devices constitute the first bridge arm, first
The lower bridge arm that full-control type semiconductor devices is the upper bridge arm of the first bridge arm, the second full-control type semiconductor devices is the first bridge arm, the
Three full-control type semiconductor devices and the 4th full-control type semiconductor devices constitute the second bridge arm, and the 3rd full-control type semiconductor devices is the
The upper bridge arm of two bridge arms, the lower bridge arm that the 4th full-control type semiconductor devices is the second bridge arm, the first full-control type semiconductor device
Part and the 4th full-control type semiconductor devices conducting, the second full-control type semiconductor devices and the 3rd full-control type are partly led
When body device ends, the direction that the direction changes circuit output DC voltage is just the second full-control type semiconductor devices
With the 3rd full-control type semiconductor devices conducting, the first full-control type semiconductor devices and the 4th full-control type semiconductor
When device ends, the direction that the direction changes circuit output DC voltage is negative.
7. the voltage pulsation restoration methods of a kind of direct-flow distribution system, it is characterised in that the restoration methods will applied to right
The recovery device described in 1-6 any one is sought, is comprised the following steps：
Energy storage device provides direct current compensation voltage；
Inverter circuit under the control of the controller, the direct current compensation voltage is converted into setting the alternating voltage of dutycycle；
The alternating voltage is converted into the adjustable DC voltage in direction by biphase rectification circuit under the control of the controller,
And the DC voltage is inputted to the output end of the direct-flow distribution system, to recover the direct-flow distribution system output voltage
Fluctuation.
8. restoration methods according to claim 7, it is characterised in that, by institute in inverter circuit under the control of the controller
State direct current compensation voltage to be converted into before the alternating voltage of setting dutycycle, the restoration methods also comprise the following steps：
Voltage collecting device gathers the load voltage of the direct-flow distribution system output；
The controller is compared the load voltage with load voltage value, determines the direction of the load voltage ripple and big
It is small；
The controller calculates the dutycycle of the inverter circuit output AC voltage according to the size of load voltage ripple；
The controller determines the direction of the biphase rectification circuit output DC voltage according to the direction of load voltage ripple.
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| CN102522897A (en) * | 2011-12-14 | 2012-06-27 | 南京航空航天大学 | Bidirectional direct-current converter with high buck-boost ratio |
| CN102810857A (en) * | 2012-07-09 | 2012-12-05 | 华中科技大学 | Power quality regulator for series direct current power system |
| CN203883677U (en) * | 2013-06-07 | 2014-10-15 | 华北电力大学 | Direct-current DC-DC sectionalizer based on phase-shift power flow control |
| CN103633845A (en) * | 2013-12-19 | 2014-03-12 | 国家电网公司 | DC-DC (Direct-Current-Direct-Current) converter |
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