CN105743353B - A kind of DC-DC conversion circuit, its control method and solid-state transformer - Google Patents
A kind of DC-DC conversion circuit, its control method and solid-state transformer Download PDFInfo
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- CN105743353B CN105743353B CN201610256943.XA CN201610256943A CN105743353B CN 105743353 B CN105743353 B CN 105743353B CN 201610256943 A CN201610256943 A CN 201610256943A CN 105743353 B CN105743353 B CN 105743353B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/3353—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having at least two simultaneously operating switches on the input side, e.g. "double forward" or "double (switched) flyback" converter
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a kind of DC-DC conversion circuit, its control method and solid-state transformer, the DC-DC conversion circuit includes voltage detecting circuit, current detection circuit, controller, driving circuit, DC-AC converters, AC-DC converter and the high frequency transformer with self coupling tap.The present invention can obtain high efficiency in entirely load variation range.
Description
Technical field
The invention belongs to power electronics field, it is related to a kind of DC-DC conversion circuit, its control method and solid-state and becomes
Depressor.
Background technology
In past 10 years, due to energy shortage and problem of environmental pollution, regenerative resource distributed power generation is by extensive concern.So
And the intermittence of regenerative resource inherently and randomness give the distributed power generation synchronizing mode proposition under traditional power grid management pattern
Stern challenge.In order to carry out optimal management to entire power grid, experts and scholars propose a variety of realization intelligent grid concepts
Method, wherein " energy internet " is representative one kind.Solid-state transformer is referred to as " energy in " energy internet "
Measure router ", it is made of power electronic devices and high frequency transformer, and the function of traditional power transformer not only may be implemented,
Also there are the advantages such as small, light-weight, anti-disturbance, energy intelligent management and power density height.
Up to the present, the solid-state transformer topology that researcher is proposed is intermediate according to whether there is during energy conversion
DC link can be roughly divided into two classes.The direct changing type topologys of AC-AC use less switching device, and structure is simpler, volume
Smaller, but secondary side voltage, current waveform are substantially the reduction to a side waveform, can not play improves power quality
Effect.In AC-DC-AC type topologys, although power conversion link and switching device quantity increase, pulse width is combined to modulate
(PWM) method and other applicable control strategies can carry out the voltage, electric current and power of system flexible modulation, therefore generation
Following development trend of table.
In order to design the solid-state transformer engineering model machine for being suitable for transmission and distribution network voltage class, two kinds can be taken to arrange
It applies.When novel switched device of the exploitation with high voltage grade, such as silicon carbide device and gallium nitride device.In this way,
A small amount of devices in series connection can meet voltage class demand, while ripe control strategy can also be transplanted and continue to make
With.However, novel switched device is more expensive at present (than your 10-20 times of traditional silicon switching device), large-scale application does not show still
It is real.Another route is become using the multi-level converter and module-cascade type that are made of the transwitch device being commonly used
Parallel operation.The working method of multi-level converter is relative complex, and increasing with striding capacitance and clamp diode quantity, is
System reliability drastically declines.Module-cascade code converter is in the side such as system reliability, modular character consistency and failure tolerant
Face shows superiority, can significantly improve the compactedness and working efficiency of system.At present about module-cascade type solid-state transformation
The research work of device is concentrated mainly on the stream of the pressure and output current of input voltage.
But the solid-state transformer scheme that domestic and international researcher is proposed all also has gap, a weight apart from practical application
It wants the reason is that bringing core loss and electronic power switch device while reducing volume of transformer by increasing working frequency
Loss increases substantially, therefore compared with traditional power transformer, solid-state transformer is less efficient.It is opened to reduce power electronics
Close the switching loss of device makes device be operated in zero voltage switch (ZVS) state by the way of resonant type soft-switch.Sofe Switch
The application of technology can reduce the switching loss of converter, improve the working efficiency of converter, be provided for the high frequency of converter
Possibility improves power density and dynamic property.
It is resonant capacitance charge and discharge that the ZVS working conditions of electronic power switch device, which are by the circulating energy in change of current inductance,
What electricity was realized.Circulating energy increases with the increase of change of current inductance, while can also increase with the increase of load current.It is existing
Have and is all made of fixed transformer winding leakage inductance or external inductance in technology as change of current inductance, in light load, load current
Small, change of current inductance is not big enough, and circulating energy deficiency can cause electronic power switch device to exit ZVS working conditions；In heavy duty
When, load current is big, and change of current inductance remains unchanged, and circulating energy is excessive to cause larger additional on-state loss.Meanwhile it is light negative
The major part of system loss is the core loss of high frequency transformer when load, and the prior art optimizes not to this.It is comprehensive
Upper described, the prior art can only obtain high efficiency in very narrow loading range.
Invention content
It is an object of the invention to overcome the above-mentioned prior art, a kind of DC-DC conversion circuit, its control are provided
Method and solid-state transformer, the circuit, its control method and solid-state transformer can obtain in entirely load variation range
To high efficiency.
In order to achieve the above objectives, DC-DC conversion circuit of the present invention, which is characterized in that exported including signal input part, signal
End, controller, driving circuit, DC-AC converters, AC-DC converter and high frequency transformer with self coupling tap, for detecting
The current detecting electricity of the voltage detecting circuit of the voltage of AC-DC converter output end, electric current for detecting converter output terminal
Road；
The input terminal of DC-AC converters is connected with signal input part, the output end and signal output end of AC-DC converter
It is connected；
The a bridge arms midpoint of DC-AC converters is connected with one end of primary coil in high frequency transformer, DC-AC converters
B bridge arms midpoint be connected with the self coupling tap of primary coil in high frequency transformer, the c bridge arms midpoints of DC-AC converters with it is high
The other end of primary coil is connected in frequency power transformer；
The d bridge arms midpoint of AC-DC converter is connected with one end of secondary coil in high frequency transformer, AC-DC converter
E bridge arms midpoint be connected with the self coupling tap of secondary coil in high frequency transformer, the f bridge arms midpoint of AC-DC converter with it is high
The other end of secondary coil is connected in frequency power transformer；
The output end of voltage detecting circuit and the output end of current detection circuit are connected with the input terminal of controller, control
The output end of device is connected with the input terminal of driving circuit, the output end of driving circuit and the control terminal and AC- of DC-AC converters
The control terminal of DC converters is connected.
The DC-AC converters include the first IGBT pipes, the 2nd IGBT pipes, the 3rd IGBT pipes, the 4th IGBT pipes, the 5th
IGBT pipes, the 6th IGBT pipes, the first diode, the second diode, third diode, the 4th diode, the 5th diode, the 6th
Diode, the first capacitance, the second capacitance, third capacitance, the 4th capacitance, the 5th capacitance and the 6th capacitance；
The cathode and an anode of first diode is connected with the collector of the first IGBT pipes and emitter respectively, and first
The both ends of capacitance are connected with the collector of the first IGBT pipes and emitter respectively；The cathode and an anode of second diode respectively with
The collector and emitter of 2nd IGBT pipes are connected, the both ends of the second capacitance respectively with the collector of the 2nd IGBT pipes and transmitting
Pole is connected；The cathode and an anode of third diode is connected with the collector of the 3rd IGBT pipes and emitter respectively, third electricity
The both ends of appearance are connected with the collector of the 3rd IGBT pipes and emitter respectively；The cathode and an anode of 4th diode is respectively with
The collector and emitter of four IGBT pipes are connected, the both ends of the 4th capacitance collector and emitter with the 4th IGBT pipes respectively
It is connected；The cathode and an anode of 5th diode is connected with the collector of the 5th IGBT pipes and emitter respectively, the 5th capacitance
Both ends be connected respectively with the collector of the 5th IGBT pipes and emitter；The cathode and an anode of 6th diode is respectively with the 6th
The collector and emitter of IGBT pipes are connected, the both ends of the 6th capacitance respectively with the collector and emitter phase of the 6th IGBT pipes
Connection；The emitter of first IGBT pipes is connected with one end of primary coil in the collector and high frequency transformer of the 2nd IGBT pipes
It connects, the emitter of the 3rd IGBT pipes is connected with the self coupling tap of primary coil in the collector and high frequency transformer of the 4th IGBT pipes
It connects, the emitter of the 5th IGBT pipes is connected with the other end of primary coil in the collector and high frequency transformer of the 6th IGBT pipes
It connects；
The grid of the output end of driving circuit and the first IGBT pipes, the grid of the 2nd IGBT pipes, the 3rd IGBT pipes grid,
Grid, the grid of the 5th IGBT pipes and the grid of the 6th IGBT pipes of 4th IGBT pipes are connected；
The collectors of first IGBT pipes, the collector of the 3rd IGBT pipes and the collector and signal input part of the 5th IGBT pipes
Anode be connected；The emitters of 2nd IGBT pipes, the emitter of the 4th IGBT pipes and the emitter and signal of the 6th IGBT pipes
The cathode of input terminal is connected.
The AC-DC converter includes the 7th IGBT pipes, the 8th IGBT pipes, the 9th IGBT pipes, the tenth IGBT pipes, the tenth
One IGBT pipes, the 12nd IGBT pipes, the 7th diode, the 8th diode, the 9th diode, the tenth diode, the 11st pole
Pipe, the 12nd diode, the 7th capacitance, the 8th capacitance, the 9th capacitance, the tenth capacitance, the 11st capacitance and the 12nd capacitance；
The cathode and an anode of 7th diode is connected with the collector of the 7th IGBT pipes and emitter respectively, and the 7th
The both ends of capacitance are connected with the collector of the 7th IGBT pipes and emitter respectively；The cathode and an anode of 8th diode respectively with
The collector and emitter of 8th IGBT pipes are connected, the both ends of the 8th capacitance respectively with the collector of the 8th IGBT pipes and transmitting
Pole is connected；The cathode and an anode of 9th diode is connected with the collector of the 9th IGBT pipes and emitter respectively, the 9th electricity
The both ends of appearance are connected with the collector of the 9th IGBT pipes and emitter respectively；The cathode and an anode of tenth diode is respectively with
The collector and emitter of ten IGBT pipes are connected, the both ends of the tenth capacitance collector and emitter with the tenth IGBT pipes respectively
It is connected；The cathode and an anode of 11st diode is connected with the collector of the 11st IGBT pipes and emitter respectively, and the tenth
The both ends of one capacitance are connected with the collector of the 11st IGBT pipes and emitter respectively；The cathode and an anode of 12nd diode
Be connected respectively with the collector of the 12nd IGBT pipes and emitter, the both ends of the 12nd capacitance respectively with the 12nd IGBT pipes
Collector and emitter are connected；It is secondary in the emitter of 7th IGBT pipes and the collector and high frequency transformer of the 8th IGBT pipes
One end of coil is connected, secondary coil in the emitter of the 9th IGBT pipes and the collector and high frequency transformer of the tenth IGBT pipes
Self coupling tap be connected, it is secondary in the emitter of the 11st IGBT pipes and the collector and high frequency transformer of the 12nd IGBT pipes
The other end of coil is connected；
The grid of the output end of driving circuit and the 7th IGBT pipes, the grid of the 8th IGBT pipes, the 9th IGBT pipes grid,
Grid, the grid of the 11st IGBT pipes and the grid of the 12nd IGBT pipes of tenth IGBT pipes are connected；
The collector and signal of the collector of 7th IGBT pipes, the collector of the 9th IGBT pipes and the 11st IGBT pipes export
The anode at end is connected；The emitter of the emitter of 8th IGBT pipes, the emitter of the tenth IGBT pipes and the 12nd IGBT pipes with
The cathode of signal output end is connected.
The control method of DC-DC conversion circuit of the present invention includes the following steps：
Current detection circuit obtains the load current information of AC-DC converter output end in real time, and AC-DC converter is defeated
The load current information of outlet is forwarded in controller, and controller is obtained according to the load current information of AC-DC converter output end
The average value of load current virtual value in default power frequency period；
When the average value of load current virtual value in default power frequency period is less than minimum preset value, controller sends out first
Drive signal, driving circuit make the work bridge arm of DC-AC converters be set as a bridge arms and c bridges according to first drive signal
Arm, while the work bridge arm of AC-DC converter being made to be set as d bridge arms and f bridge arms；
When the average value of load current virtual value in default power frequency period is more than or equal to minimum preset value and less than or equal to most
When big preset value, controller sends out the second drive signal, and driving circuit makes DC-AC converters according to second drive signal
Work bridge arm is set as a bridge arms and b bridge arms, while the work bridge arm of AC-DC converter being made to be set as d bridge arms and e bridge arms；
When the average value of load current virtual value in default power frequency period is more than maximum preset value, controller generates third
Drive signal, driving circuit make the work bridge arm of DC-AC converters be set as b bridge arms and c bridges according to the third drive signal
Arm, while the work bridge arm of AC-DC converter being made to be set as e bridge arms and f bridge arms.
Solid-state transformer of the present invention include n rectifier, n sections of high voltage dc bus, n sections of low-voltage direct busbares,
Inverter, filter and n DC-DC conversion circuit；
Power grid anode be connected with the anode of first rectifier input, the latter rectifier input anode and
The cathode of previous rectifier input is connected, and the cathode of n-th of rectifier input is connected with the cathode of power grid, and i-th
The input that the output end of a rectifier passes through DC-AC converters in i-th section of high voltage dc bus and i-th of DC-DC conversion circuit
End is connected, the positive phase of the anode and low-voltage direct busbar of the output end of AC-DC converter in n DC-DC conversion circuit (4)
It connects, the cathode of AC-DC converter output end is connected with the cathode of low-voltage direct busbar in n DC-DC conversion circuit, inversion
The input terminal of device is connected with low-voltage direct busbar, and the output end of inverter is connected with the input terminal of filter, filter
Output end is connected with load, wherein 1≤i≤n.
The anode of power grid is connected with the anode of first rectifier input by grid side filter inductance.
High voltage dc bus capacitance is equipped between the anode and cathode of each high voltage dc bus.
Low-voltage direct bus capacitor is equipped between the anode and cathode of each low-voltage direct busbar.
The invention has the advantages that：
DC-DC conversion circuit and its control method of the present invention are when in use, electric when being loaded in default power frequency period
The average value for flowing virtual value is more than maximum preset value, i.e. system is in heavy duty state, then makes the work bridge arm of DC-AC converters
For b bridge arms and c bridge arms, the work bridge arm of AC-DC converter is made to be set as e bridge arms and f bridge arms, reduces change of current inductance, to subtract
It is few that on-state loss is added caused by circulating energy；When the average value of load current virtual value in default power frequency period is more than or equal to
Minimum preset value and less than or equal to maximum preset value when, then make DC-AC converters work bridge arm be a bridge arms and b bridge arms, AC-
The work bridge arm of DC converters is set as d bridge arms and e bridge arms, and it is preferred fixed change of current inductance value to maintain change of current inductance, retains and passes
The high-efficiency operation section for DC-DC converter of uniting；When the average value of load current virtual value in default power frequency period is less than minimum
When preset value, i.e., when system is in light load, then it is a bridge arms and c bridge arms, AC-DC transformation to make the work bridge arm of DC-AC converters
The work bridge arm of device is set as d bridge arms and f bridge arms, increases change of current inductance, and energy is made to be able to maintain that switching device in ZVS work shapes
State mitigates the switching loss of each IGBT pipes, while umber of turn increases reduction iron core inside transformer loss.It is of the present invention solid
State transformer when in use, according to switch operating bridge arm the case where load, adjust in high frequency transformer armature winding and it is secondary around
The number of turns of group realizes the high-efficiency operation in wide loading range.
Description of the drawings
Fig. 1 is the circuit diagram of DC-DC conversion circuit 4 in the present invention；
Fig. 2 is the circuit diagram of solid-state transformer in the present invention；
Fig. 3 is the flow chart that DC-DC converter bridge arm switches in the present invention.
Wherein, 1 it is grid side filter inductance, 2 be rectifier, 3 be high voltage dc bus, 4 be DC-DC conversion circuit, 5 is
Low-voltage direct busbar, 6 be inverter, 7 be filter.
Specific implementation mode
The present invention is described in further detail below in conjunction with the accompanying drawings：
With reference to figure 1 and Fig. 2, DC-DC conversion circuit of the present invention includes signal input part, signal output end, controller, driving
It is circuit, DC-AC converters, AC-DC converter and high frequency transformer HFT with self coupling tap, defeated for detecting AC-DC converter
The current detection circuit of the voltage detecting circuit of the voltage of outlet, electric current for detecting AC-DC converter output end；DC-AC
The input terminal of converter is connected with signal input part, and the output end of AC-DC converter is connected with signal output end；DC-AC
The a bridge arms midpoint of converter is connected with one end of primary coil in high frequency transformer HFT, the b bridge arms midpoint of DC-AC converters
It is connected with the self coupling tap of primary coil in high frequency transformer HFT, the c bridge arms midpoint of DC-AC converters and high frequency transformer
The other end of primary coil is connected in HFT；The d bridge arms midpoint of AC-DC converter and secondary coil in high frequency transformer HFT
One end is connected, and the e bridge arms midpoint of AC-DC converter is connected with the self coupling tap of secondary coil in high frequency transformer HFT,
The f bridge arms midpoint of AC-DC converter is connected with the other end of secondary coil in high frequency transformer HFT；Voltage detecting circuit
The output end of output end and current detection circuit is connected with the input terminal of controller, the output end of controller and driving circuit
Input terminal is connected, and the output end of driving circuit is connected with the control terminal of the control terminal of DC-AC converters and AC-DC converter
It connects.
The DC-AC converters include the first IGBT pipes S1, the 2nd IGBT pipes S2, the 3rd IGBT pipes S3, the 4th IGBT pipe
S4, the 5th IGBT pipes S5, the 6th IGBT pipes S6, the first diode D1, the second diode D2, third diode D3, the 4th diode
D4, the 5th diode D5, the 6th diode D6, the first capacitance C1, the second capacitance C2, third capacitance C3, the 4th capacitance C4, the 5th electricity
Hold C5And the 6th capacitance C6；The first diode D1Cathode and an anode respectively with the first IGBT pipes S1Collector and transmitting
Pole is connected, the first capacitance C1Both ends respectively with the first IGBT pipes S1Collector and emitter be connected；Second diode D2
Cathode and an anode respectively with the 2nd IGBT pipes S2Collector and emitter be connected, the second capacitance C2Both ends respectively with
Two IGBT pipes S2Collector and emitter be connected；Third diode D3Cathode and an anode respectively with the 3rd IGBT pipes S3's
Collector and emitter are connected, third capacitance C3Both ends respectively with the 3rd IGBT pipes S3Collector and emitter be connected；
4th diode D4Cathode and an anode respectively with the 4th IGBT pipes S4Collector and emitter be connected, the 4th capacitance C4's
Both ends respectively with the 4th IGBT pipes S4Collector and emitter be connected；5th diode D5Cathode and an anode respectively with
Five IGBT pipes S5Collector and emitter be connected, the 5th capacitance C5Both ends respectively with the 5th IGBT pipes S5Collector and
Emitter is connected；6th diode D6Cathode and an anode respectively with the 6th IGBT pipes S6Collector and emitter be connected,
6th capacitance C6Both ends respectively with the 6th IGBT pipes S6Collector and emitter be connected；First IGBT pipes S1Emitter
With the 2nd IGBT pipes S2Collector and high frequency transformer HFT in one end of primary coil be connected, the 3rd IGBT pipes S3Transmitting
Pole and the 4th IGBT pipes S4Collector and high frequency transformer HFT in the self coupling tap of primary coil be connected, the 5th IGBT pipes S5
Emitter and the 6th IGBT pipes S6Collector and high frequency transformer (HFT) in the other end of primary coil be connected；Driving
The output end of circuit and the first IGBT pipes S1Grid, the 2nd IGBT pipes S2Grid, the 3rd IGBT pipes S3Grid, the 4th
IGBT pipes S4Grid, the 5th IGBT pipes S5Grid and the 6th IGBT pipes S6Grid be connected；First IGBT pipes S1Current collection
Pole, the 3rd IGBT pipes S3Collector and the 5th IGBT pipes S5Collector be connected with the anode of signal input part；2nd IGBT
Pipe S2Emitter, the 4th IGBT pipes S4Emitter and the 6th IGBT pipes S6Emitter be connected with the cathode of signal input part
It connects.
The AC-DC converter includes the 7th IGBT pipes S7, the 8th IGBT pipes S8, the 9th IGBT pipes S9, the tenth IGBT pipe
S10, the 11st IGBT pipes S11, the 12nd IGBT pipes S12, the 7th diode D7, the 8th diode D8, the 9th diode D9, the tenth
Diode D10, the 11st diode D11, the 12nd diode D12, the 7th capacitance C7, the 8th capacitance C8, the 9th capacitance C9, the tenth
Capacitance C10, the 11st capacitance C11And the 12nd capacitance C12；The 7th diode D7Cathode and an anode respectively with the 7th IGBT
Pipe S7Collector and emitter be connected, the 7th capacitance C7Both ends respectively with the 7th IGBT pipes S7Collector and emitter
It is connected；8th diode D8Cathode and an anode respectively with the 8th IGBT pipes S8Collector and emitter be connected, the 8th electricity
Hold C8Both ends respectively with the 8th IGBT pipes S8Collector and emitter be connected；9th diode D9Cathode and an anode point
Not with the 9th IGBT pipes S9Collector and emitter be connected, the 9th capacitance C9Both ends respectively with the 9th IGBT pipes S9Collection
Electrode and emitter are connected；Tenth diode D10Cathode and an anode respectively with the tenth IGBT pipes S10Collector and transmitting
Pole is connected, the tenth capacitance C10Both ends respectively with the tenth IGBT pipes S10Collector and emitter be connected；11st pole
Pipe D11Cathode and an anode respectively with the 11st IGBT pipes S11Collector and emitter be connected, the 11st capacitance C11Two
End respectively with the 11st IGBT pipes S11Collector and emitter be connected；12nd diode D12Cathode and an anode difference
With the 12nd IGBT pipes S12Collector and emitter be connected, the 12nd capacitance C12Both ends respectively with the 12nd IGBT manage
S12Collector and emitter be connected；7th IGBT pipes S7Emitter and the 8th IGBT pipes S8Collector and high frequency transformation
One end of secondary coil is connected in device HFT, the 9th IGBT pipes S9Emitter and the tenth IGBT pipes S10Collector and high frequency
The self coupling tap of secondary coil is connected in transformer HFT, the 11st IGBT pipes S11Emitter and the 12nd IGBT pipes S12's
The other end of secondary coil is connected in collector and high frequency transformer HFT；The output end of driving circuit and the 7th IGBT pipes S7
Grid, the 8th IGBT pipes S8Grid, the 9th IGBT pipes S9Grid, the tenth IGBT pipes S10Grid, the 11st IGBT pipe
S11Grid and the 12nd IGBT pipes S12Grid be connected；7th IGBT pipes S7Collector, the 9th IGBT pipes S9Current collection
Pole and the 11st IGBT pipes S11Collector be connected with the anode of signal output end；8th IGBT pipes S8Emitter, the tenth
IGBT pipes S10Emitter and the 12nd IGBT pipes S12Emitter be connected with the cathode of signal output end.
The control method of DC-DC conversion circuit of the present invention includes the following steps：
Current detection circuit obtains the load current information of AC-DC converter output end in real time, and AC-DC converter is defeated
The load current information of outlet is forwarded in controller, and controller is obtained according to the load current information of AC-DC converter output end
The average value of load current virtual value in default power frequency period；
When the average value of load current virtual value in default power frequency period is less than minimum preset value, controller sends out first
Drive signal, driving circuit make the work bridge arm of DC-AC converters be set as a bridge arms and c bridges according to first drive signal
Arm, while the work bridge arm of AC-DC converter being made to be set as d bridge arms and f bridge arms；
When the average value of load current virtual value in default power frequency period is more than or equal to minimum preset value and less than or equal to most
When big preset value, controller sends out the second drive signal, and driving circuit makes DC-AC converters according to second drive signal
Work bridge arm is set as a bridge arms and b bridge arms, while the work bridge arm of AC-DC converter being made to be set as d bridge arms and e bridge arms；
When the average value of load current virtual value in default power frequency period is more than maximum preset value, controller generates third
Drive signal, driving circuit make the work bridge arm of DC-AC converters be set as b bridge arms and c bridges according to the third drive signal
Arm, while the work bridge arm of AC-DC converter being made to be set as e bridge arms and f bridge arms.
It should be noted that the high-frequency isolation transformer of the primary coil and secondary coil with self coupling tap,
As change of current inductance and capacitance resonance occurs for winding leakage inductance, and each IGBT pipes is made to be operated in ZVS states；Access the umber of turn of circuit
More, the change of current inductance value for participating in resonance is bigger；Before the working condition of DC-AC converters and AC-DC converter bridge arm changes
Afterwards, ensure primary coil with the umber of turn in secondary coil than constant.
With reference to figure 3, solid-state transformer of the present invention includes n rectifier 2, n sections of high voltage dc bus 3, n sections of low pressure
DC bus 5, inverter 6, filter 7 and n DC-DC conversion circuit 4；Anode and first 2 input terminal of rectifier of power grid
Anode be connected, 2 input terminal of the latter rectifier anode be connected with the cathode of 2 input terminal of previous rectifier, n-th
The cathode of 2 input terminal of rectifier is connected with the cathode of power grid, and the output end of i-th of rectifier 2 passes through i-th section of high voltage direct current mother
Line 3 is connected with the input terminal of DC-AC converters in i-th of DC-DC conversion circuit 4, AC- in n DC-DC conversion circuit (4)
The anode of the output end of DC converters is connected with the anode of low-voltage direct busbar 5, and AC-DC becomes in n DC-DC conversion circuit 4
The cathode of parallel operation output end is connected with the cathode of low-voltage direct busbar 5, input terminal and 5 phase of low-voltage direct busbar of inverter 6
Connection, the output end of inverter 6 are connected with the input terminal of filter 7, and the output end of filter 7 is connected with load, wherein
1≤i≤n。
It should be noted that the anode of power grid and the anode of first 2 input terminal of rectifier pass through grid side filter inductance 1
It is connected；High voltage dc bus capacitance is equipped between the anode and cathode of each high voltage dc bus 3；Each low-voltage direct busbar 5
Low-voltage direct bus capacitor is equipped between anode and cathode.
Rectifier 2 ensures that high voltage direct current is female using voltage, current double closed-loop control and phase-shift PWM controlled, outer voltage
3 voltage constant of line, current inner loop make the Phase Tracking input voltage phase of net side input current to realize that unity power factor is transported
Row, phase-shift PWM controlled improve the sine degree of 2 exchange side voltage of rectifier, reduce harmonic wave and electromagnetic interference；DC-DC conversion circuit 4
Using phase shifting control, high-pressure side DC-AC converters and low-pressure side AC-DC converter are all made of the square wave that duty ratio is 50% and drive
It is dynamic, but the IGBT of the latter postpones a phase angle than the drive signal of device on the former corresponding position, and the size at phase angle
It is determined through PI adjustings by the deviation of 5 voltage actual magnitude of low-voltage direct busbar and expectation amplitude；Inverter 6 is used to be had with voltage
The double-loop control strategy of valid value outer shroud and instantaneous voltage inner ring is negative after the filtered device of output voltage 7 filters out higher hamonic wave
Carry the sinusoidal voltage that constant amplitude is provided.
In light load, the ratio that core loss accounts for total losses is big, adjusts DC-AC converters and AC-DC converter at this time
Work bridge arm so that transformer winding the number of turns in the DC-DC conversion circuit 4 of access circuit is increased, but caused by its each circle
Electromotive force reduces, and iron core magnetic flux density also decreases.Magnetic hystersis loss and eddy-current loss all with the reduction of iron core magnetic flux density and
It greatly reduces, no-load current and no-load loss are also all correspondingly greatly reduced therewith, energy saving to admirably achieve
The purpose of damage drops.Meanwhile umber of turn increase makes the circulating energy of change of current inductance keep higher value in light load, maintains electric power
The ZVS working conditions of electronic switching device, to mitigate switching loss.In middle load, traditional DC-DC converter usually have compared with
High working efficiency, it is preferred to maintain change of current inductance at this time by adjusting DC-AC converters and the work bridge arm of AC-DC converter
Fixed change of current inductance value retains the high-efficiency operation section of traditional DC-DC converter.In heavy duty, ratio that on-state loss accounts for
Example is big, adjusts the work bridge arm of DC-AC converters and AC-DC converter at this time and makes to become in the DC-DC conversion circuit 4 of access circuit
Depressor HFT umber of turns are reduced, and the circulating energy of change of current inductance reduces, and mitigates and adds on-state loss.
The present invention is real according to transformer HFT umber of turns in the DC-DC conversion circuit 4 for changing access circuit with load situation
The core loss of transformer HFT is now reduced when light load, and maintains the Sofe Switch working condition of IGBT to reduce devices switch damage
Consumption reduces when heavy duty by the additional on-state loss caused by change of current inductance circulating energy, realizes that solid-state transformer HFT is negative in width
Carry the high-efficiency operation in range.
Specific embodiment described herein is only an illustration of the spirit of the invention.The technical field of the invention
Technical staff can modify to described specific embodiment, supplement or be substituted with approximation method, but without departing from
The spirit or beyond the scope defined by the appended claims of the present invention.
Claims (3)
1. a kind of control method of DC-DC conversion circuit, which is characterized in that be based on DC-DC conversion circuit (4), the DC-DC becomes
Change circuit include signal input part, signal output end, controller, driving circuit, DC-AC converters, AC-DC converter and with from
The high frequency transformer (HFT) of coupling tap, the voltage detecting circuit of the voltage for detecting AC-DC converter output end, for examining
Survey the current detection circuit of the electric current of AC-DC converter output end；
The input terminal of DC-AC converters is connected with signal input part, and the output end of AC-DC converter is connected with signal output end
It connects；
The a bridge arms midpoint of DC-AC converters is connected with one end of primary coil in high frequency transformer (HFT), DC-AC converters
B bridge arms midpoint be connected with the self coupling tap of primary coil in high frequency transformer (HFT), the c bridge arms midpoint of DC-AC converters
It is connected with the other end of primary coil in high frequency transformer (HFT)；
The d bridge arms midpoint of AC-DC converter is connected with one end of secondary coil in high frequency transformer (HFT), AC-DC converter
E bridge arms midpoint be connected with the self coupling tap of secondary coil in high frequency transformer (HFT), the f bridge arms midpoint of AC-DC converter
It is connected with the other end of secondary coil in high frequency transformer (HFT)；
The output end of voltage detecting circuit and the output end of current detection circuit are connected with the input terminal of controller, controller
Output end is connected with the input terminal of driving circuit, and the output end of driving circuit becomes with the control terminal of DC-AC converters and AC-DC
The control terminal of parallel operation is connected；
Include the following steps：
Current detection circuit obtains the load current information of AC-DC converter output end in real time, and by AC-DC converter output end
Load current information be forwarded in controller, controller must be preset according to the load current information of AC-DC converter output end
The average value of load current virtual value in power frequency period；
When the average value of load current virtual value in default power frequency period is less than minimum preset value, controller sends out the first driving
Signal, driving circuit make the work bridge arm of DC-AC converters be set as a bridge arms and c bridge arms according to first drive signal, together
When so that the work bridge arm of AC-DC converter is set as d bridge arms and f bridge arms；
When the average value of load current virtual value in default power frequency period is more than or equal to minimum preset value and is less than or equal to maximum pre-
If when value, controller sends out the second drive signal, and driving circuit makes the work of DC-AC converters according to second drive signal
Bridge arm is set as a bridge arms and b bridge arms, while the work bridge arm of AC-DC converter being made to be set as d bridge arms and e bridge arms；
When the average value of load current virtual value in default power frequency period is more than maximum preset value, controller generates third driving
Signal, driving circuit make the work bridge arm of DC-AC converters be set as b bridge arms and c bridge arms according to the third drive signal, together
When so that the work bridge arm of AC-DC converter is set as e bridge arms and f bridge arms.
2. the control method of DC-DC conversion circuit according to claim 1, which is characterized in that the DC-AC converters packet
Include the first IGBT pipes (S1), the 2nd IGBT manage (S2), the 3rd IGBT manage (S3), the 4th IGBT manage (S4), the 5th IGBT manage (S5),
Six IGBT manage (S6), the first diode (D1), the second diode (D2), third diode (D3), the 4th diode (D4), the five or two
Pole pipe (D5), the 6th diode (D6), the first capacitance (C1), the second capacitance (C2), third capacitance (C3), the 4th capacitance (C4),
Five capacitance (C5) and the 6th capacitance (C6)；
First diode (the D1) cathode and an anode respectively with the first IGBT manage (S1) collector and emitter be connected,
First capacitance (C1) both ends respectively with the first IGBT manage (S1) collector and emitter be connected；Second diode (D2)
Cathode and an anode manages (S with the 2nd IGBT respectively2) collector and emitter be connected, the second capacitance (C2) both ends respectively with
2nd IGBT manages (S2) collector and emitter be connected；Third diode (D3) cathode and an anode respectively with the 3rd IGBT
Manage (S3) collector and emitter be connected, third capacitance (C3) both ends respectively with the 3rd IGBT manage (S3) collector and
Emitter is connected；4th diode (D4) cathode and an anode respectively with the 4th IGBT manage (S4) collector and emitter phase
Connection, the 4th capacitance (C4) both ends respectively with the 4th IGBT manage (S4) collector and emitter be connected；5th diode
(D5) cathode and an anode respectively with the 5th IGBT manage (S5) collector and emitter be connected, the 5th capacitance (C5) both ends
Respectively (S is managed with the 5th IGBT5) collector and emitter be connected；6th diode (D6) cathode and an anode respectively with
Six IGBT manage (S6) collector and emitter be connected, the 6th capacitance (C6) both ends respectively with the 6th IGBT manage (S6) collection
Electrode and emitter are connected；First IGBT manages (S1) emitter and the 2nd IGBT manage (S2) collector and high frequency transformer
(HFT) one end of primary coil is connected in, and the 3rd IGBT manages (S3) emitter and the 4th IGBT manage (S4) collector and height
The self coupling tap of primary coil is connected in frequency power transformer (HFT), and the 5th IGBT manages (S5) emitter and the 6th IGBT manage (S6)
Collector and high frequency transformer (HFT) in the other end of primary coil be connected；
The output end of driving circuit and the first IGBT manage (S1) grid, the 2nd IGBT manage (S2) grid, the 3rd IGBT manage (S3)
Grid, the 4th IGBT manage (S4) grid, the 5th IGBT manage (S5) grid and the 6th IGBT manage (S6) grid be connected；
First IGBT manages (S1) collector, the 3rd IGBT manage (S3) collector and the 5th IGBT manage (S5) collector and letter
The anode of number input terminal is connected；2nd IGBT manages (S2) emitter, the 4th IGBT manage (S4) emitter and the 6th IGBT pipe
(S6) emitter be connected with the cathode of signal input part.
3. the control method of DC-DC conversion circuit according to claim 2, which is characterized in that the AC-DC converter packet
Include the 7th IGBT pipes (S7), the 8th IGBT manage (S8), the 9th IGBT manage (S9), the tenth IGBT manage (S10), the 11st IGBT pipe
(S11), the 12nd IGBT manage (S12), the 7th diode (D7), the 8th diode (D8), the 9th diode (D9), the tenth diode
(D10), the 11st diode (D11), the 12nd diode (D12), the 7th capacitance (C7), the 8th capacitance (C8), the 9th capacitance
(C9), the tenth capacitance (C10), the 11st capacitance (C11) and the 12nd capacitance (C12)；
7th diode (the D7) cathode and an anode respectively with the 7th IGBT manage (S7) collector and emitter be connected,
7th capacitance (C7) both ends respectively with the 7th IGBT manage (S7) collector and emitter be connected；8th diode (D8)
Cathode and an anode manages (S with the 8th IGBT respectively8) collector and emitter be connected, the 8th capacitance (C8) both ends respectively with
8th IGBT manages (S8) collector and emitter be connected；9th diode (D9) cathode and an anode respectively with the 9th IGBT
Manage (S9) collector and emitter be connected, the 9th capacitance (C9) both ends respectively with the 9th IGBT manage (S9) collector and
Emitter is connected；Tenth diode (D10) cathode and an anode respectively with the tenth IGBT manage (S10) collector and emitter
It is connected, the tenth capacitance (C10) both ends respectively with the tenth IGBT manage (S10) collector and emitter be connected；11st
Pole pipe (D11) cathode and an anode respectively with the 11st IGBT manage (S11) collector and emitter be connected, the 11st capacitance
(C11) both ends respectively with the 11st IGBT manage (S11) collector and emitter be connected；12nd diode (D12) the moon
Pole and anode manage (S with the 12nd IGBT respectively12) collector and emitter be connected, the 12nd capacitance (C12) both ends point
(S is not managed with the 12nd IGBT12) collector and emitter be connected；7th IGBT manages (S7) emitter and the 8th IGBT manage
(S8) collector and high frequency transformer (HFT) in one end of secondary coil be connected, the 9th IGBT manages (S9) emitter and
Ten IGBT manage (S10) collector and high frequency transformer (HFT) in the self coupling tap of secondary coil be connected, the 11st IGBT pipes
(S11) emitter and the 12nd IGBT manage (S12) collector and high frequency transformer (HFT) in secondary coil other end phase
Connection；
The output end of driving circuit and the 7th IGBT manage (S7) grid, the 8th IGBT manage (S8) grid, the 9th IGBT manage (S9)
Grid, the tenth IGBT manage (S10) grid, the 11st IGBT manage (S11) grid and the 12nd IGBT manage (S12) grid phase
Connection；
7th IGBT manages (S7) collector, the 9th IGBT manage (S9) collector and the 11st IGBT manage (S11) collector with
The anode of signal output end is connected；8th IGBT manages (S8) emitter, the tenth IGBT manage (S10) emitter and the 12nd
IGBT manages (S12) emitter be connected with the cathode of signal output end.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103532398A (en) * | 2013-09-12 | 2014-01-22 | 上海查尔斯电子有限公司 | Power electronic transformer |
| CN103595259A (en) * | 2013-11-28 | 2014-02-19 | 南京航空航天大学 | Double-transformer serial-parallel isolated-type soft switching direct-current converter and control method thereof |
| CN104811047A (en) * | 2014-01-27 | 2015-07-29 | 伊顿制造（格拉斯哥）有限合伙莫尔日分支机构 | Bidirectional direct-current/direct-current converter and control method thereof |
| CN104883065A (en) * | 2015-05-29 | 2015-09-02 | 西安交通大学 | High-frequency isolation circuit, control method thereof and solid-state transformer |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9356519B2 (en) * | 2014-02-12 | 2016-05-31 | Sanken Electric Co., Ltd. | Current balance circuit of resonant type switching power-supply circuit |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103532398A (en) * | 2013-09-12 | 2014-01-22 | 上海查尔斯电子有限公司 | Power electronic transformer |
| CN103595259A (en) * | 2013-11-28 | 2014-02-19 | 南京航空航天大学 | Double-transformer serial-parallel isolated-type soft switching direct-current converter and control method thereof |
| CN104811047A (en) * | 2014-01-27 | 2015-07-29 | 伊顿制造（格拉斯哥）有限合伙莫尔日分支机构 | Bidirectional direct-current/direct-current converter and control method thereof |
| CN104883065A (en) * | 2015-05-29 | 2015-09-02 | 西安交通大学 | High-frequency isolation circuit, control method thereof and solid-state transformer |
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