CN107800315A - A kind of multi-electrical level inverter power topology, control mode and inverter system using three-terminal switch network - Google Patents
A kind of multi-electrical level inverter power topology, control mode and inverter system using three-terminal switch network Download PDFInfo
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- CN107800315A CN107800315A CN201710476693.5A CN201710476693A CN107800315A CN 107800315 A CN107800315 A CN 107800315A CN 201710476693 A CN201710476693 A CN 201710476693A CN 107800315 A CN107800315 A CN 107800315A
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
Abstract
The invention discloses a kind of more level power topology inverter systems using three-terminal switch network, its inverter circuit includes the type of multi-electrical level inverter circuit five of single phase half bridge inverter circuit, the single-phase full-bridge inverter circuit of two-winding transformer of coupled in reverse wi, the single-phase full-bridge inverter circuit of two-winding transformer of two coupled in reverse wi, three-phase half-bridge inverter circuit and multiple coupling structure.The present invention is compared with conventional diode Clamp multi-level inverse conversion topology, more level outputs can be realized at inversion midpoint, so as to improve harmonic wave of output voltage, the size for reducing output inductor and volume, reduce switching device loss, therefore reduce system material cost, improve the electric property of inverter.
Description
Technical field
The present invention relates to a kind of multi-electrical level inverter, especially a kind of more level powers topology using three-terminal switch network
Inverter system and its control mode.
Background technology
Direct current is converted to alternating current by inverter, is motor driving frequency converter, induction heating apparatus, uninterrupted power source
(UPS), and wind energy, photovoltaic, with the important component in the grid-connected power generation system such as fuel cell.Conversion efficiency,
Output harmonic wave is one of most important electrical specifications of inverter, and high conversion efficiency can reduce energy loss, and low harmony wave can improve electricity
Can quality.
The power attenuation of inverter internal power device and output inductor limits further carrying for inverter efficiency
Height, while the rise of the prices of raw materials such as Japanese TV play fierceness, power switch pipe and steel copper of market competition, give inverter producer
Bring very big cost pressure.It is presently limited to the performance of power device, power device and filtering in conventional inverter topology
The power attenuation of inductance has been difficult further to reduce, and develops high-performance, the inverter of low cost turns into each inverter producer
One of common-denominator target.
The level topology inverter of conventional half-bridge two uses the device for power switching of high withstand voltage, larger on-state loss be present and opens
Loss is closed, so as to reduce the conversion efficiency of whole system.Output inductor volume is larger simultaneously, further have impact on efficiency
With cost, and it is poor to export the quality of power supply.Multi-electrical level inverter topology has obtained increasing practical application in recent years, can
Using low Breakdown Voltage Power switching tube to reduce loss, while reduce inductance volume and improve the quality of power supply.Wherein, neutral point clamp
The more level topologys of type NPC are because circuit structure is succinct, so as to widely apply in UPS and photovoltaic DC-to-AC converter.But NPC is more, and level is opened up
It is too many to flutter middle power switch pipe quantity, system control becomes more complicated, while clamp diode adds total losses, reduced
Efficiency.
Industrial quarters it is expected that the inverter of more best performance occurs, and on-state loss and the switch of cpable of lowering power switching device damage
Consumption, and output inductor loss and cost are reduced, this novel inverter can improve traditional two level level topologys more with NPC
Limitation with deficiency.
The content of the invention
It is an object of the invention to provide a kind of switching device loss it is small, output current harmonics are small, to solve the above-mentioned back of the body
The problem of being proposed in scape technology.
To achieve the above object, the present invention provides following technical scheme：A kind of more level work(using three-terminal switch network
Rate topology inverter system, its inverter circuit include input voltage, power switch, input filter capacitor, transformer, output filter
Ripple electric capacity and output inductor, the power switch include power switch pipe and diode, and the transformer is coupled in reverse wi
Transformer；Input voltage connects power switch and input filter capacitor, input filter capacitor connection power switch respectively, and power supply is opened
Pass passes sequentially through transformer and connects output filter capacitor with output inductor.
The control mode of more level power topology inverter systems using three-terminal switch network, utilizes output voltage
Linear functional relation between Va0 and the dutycycle D of power switch tube S 1, unified level is carried out using SPWM modulation strategies
Outputting data signals control；SPWM modulation strategy operation principles be using the positive and negative half-cycle signals of baseline sinusoidal wave Vsin respectively with
Triangular carrier Vtri produces s1 drive signals more afterwards, the positive and negative half-cycle signal of identical baseline sinusoidal wave signal respectively with phase shift
It is s3 that 180 ° of triangular wave carrier, which compares s3 to produce drive signal, and wherein s2 drive signals and s1 drive signals is complementary, s4 drivings
Signal is complementary with s3 drive signals, between s1 drive signals, s2 drive signals, s3 drive signals and s4 drive signals staggeredly simultaneously
Connection.
As further scheme of the invention：More level power topology inverter systems using three-terminal switch network
System, filter inductance L1 have two kinds of forms, and a kind of is the normal of a coupled in reverse wi transformer T1 and output inductor L1
Structure is advised, another kind is that independent output inductor is integrated into the two-winding transformer of coupled in reverse wi；The filtered electrical
Core structure in sense is E-type magnetic cored structure or annular mixing core structure, and the magnetic core material in the filter inductance is iron oxygen
Body, amorphous or powder core material；The power switch pipe is insulated gate bipolar transistor, metal oxide semiconductor field-effect crystalline substance
Body pipe, gate pole can break IGCT.
Compared with prior art, the beneficial effects of the invention are as follows：
The present invention can realize that more level are defeated compared with conventional diode Clamp multi-level inverse conversion topology at inversion midpoint
Go out, so as to improve harmonic wave of output voltage, the size for reducing output inductor and volume, reduce switching device loss, therefore drop
Low system material cost, the electric property for improving inverter.
Brief description of the drawings
Fig. 1 is the electrical block diagram of inverter circuit in the present invention.
Fig. 2 is the circuit diagram of single phase half bridge inverter circuit in the present invention.
Fig. 3 is the conventional structure schematic diagram of output inductor L1 in the present invention.
Fig. 4 is the structural representation of the two-winding transformer that output inductor L1 is integrated into reverse coupled in the present invention.
Fig. 5 is the dutycycle D of power switch tube S 1 in the present invention<Working state figure when 0.5.
Fig. 6 is the dutycycle D of power switch tube S 1 in the present invention>Working state figure when 0.5.
Fig. 7 is mathematical representation between inversion mid-point voltage Va0 and the dutycycle D of power switch tube S 1 in the present invention.
Fig. 8 produces structure chart for more level output data control signals in the present invention.
Fig. 9 is more level output data control signal SPWM modulation strategy schematic diagrams in the present invention.
Figure 10 is the circuit diagram of the single-phase full-bridge inverter circuit of the two-winding transformer of a coupled in reverse wi in the present invention.
Figure 11 is the circuit diagram of the single-phase full-bridge inverter circuit of the two-winding transformer of two coupled in reverse wi in the present invention.
Figure 12 is the circuit diagram of three-phase half-bridge inverter circuit in the present invention
Figure 13 is the circuit diagram of the multi-electrical level inverter circuit of multiple coupling structure in the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made
Embodiment, belong to the scope of protection of the invention.
Referring to Fig. 1, in the embodiment of the present invention, a kind of more level power topology inverter systems using three-terminal switch network
System, its inverter circuit include input voltage, power switch, input filter capacitor, transformer, output filter capacitor and output filter
Ripple inductance, the power switch include power switch pipe and diode, and the transformer is coupled in reverse wi transformer；Input voltage
Power switch and input filter capacitor, input filter capacitor connection power switch are connected respectively, and power switch passes sequentially through transformation
Device connects output filter capacitor with output inductor.
More level power topology inverter systems using three-terminal switch network, its inverter circuit include single-phase half
Bridge inverter circuit, coupled in reverse wi two-winding transformer single-phase full-bridge inverter circuit, the two of two coupled in reverse wi
The multi-electrical level inverter of the single-phase full-bridge inverter circuit of winding transformer, three-phase half-bridge inverter circuit and multiple coupling structure
The type of circuit five.
Referring to Fig. 2, single phase half bridge inverter circuit includes two input filter capacitors, a coupled in reverse wi transformation
Device, an output filter capacitor, an output inductor and the electricity being made up of two power switch pipes and two diodes
Source switch, the positive pole of input voltage vin connect input filter capacitor C1, power switch pass pipe S1, diode D1, power and opened respectively
Pipe S3, diode D3 are closed, the other end of power switch tube S 1 connects diode D1 positive poles and coupled in reverse wi transformer T1 sp respectively
Pin is held, the other end of power switch tube S 3 connects diode D3 positive poles, power switch tube S 4, diode D4, coupled in reverse wi and become respectively
Depressor T1 pm ends pin, the other end of power switch tube S 2 connect diode D2 positive poles, the other end of power switch tube S 4, two respectively
The negative pole of pole pipe D4 positive poles, input filter capacitor C2 and input voltage vin, coupled in reverse wi transformer T1 sm ends pin and pp ends pin
Output filter capacitor C2 and exclusion R1 are connected by output inductor L1 respectively after parallel connection.
Refer to Fig. 3~4, filter inductance has two kinds of forms, and filter inductance is a coupled in reverse wi transformer T1 in Fig. 9
With output inductor L1 conventional structure, in Figure 10 filter inductance be independent output inductor is integrated into it is anti-phase
In the two-winding transformer of coupling, the leakage inductance of the two-winding transformer of coupled in reverse wi can be used as output inductor in other words.
Core structure in filter inductance is E-type magnetic cored structure or annular mixing magnetic core, the magnetic core material in filter inductance be ferrite,
Amorphous or powder core.Power switch pipe is that insulated gate bipolar transistor, mos field effect transistor, gate pole can
Disconnected IGCT.
Refer to Fig. 5~6, in figure, s1, s2, s3, s4 are respectively power switch tube S 1, power switch tube S 2, power switch
Pipe S3 and power switch tube S 4 drive signal, Va0 are inversion mid-point voltage, and i1, i2 are two of coupled in reverse wi transformer T1
Winding current, Vbc are coupled in reverse wi transformer T1 two winding terminal voltages, and im is coupled in reverse wi transformer T1 excitatory electricity
Stream.If the dutycycle of power switch tube S 1 is D, input voltage Vin, output voltage Vout。
Fig. 2 and Fig. 5 are referred to, as the dutycycle D of power switch tube S 1<When 0.5, in a complete switch periods, hand over
Four operation modes be present in wrong parallel single-phase tri-level half-bridge inverter.
(1) t0~t1：Power switch tube S 1 and power switch tube S 4 turn on, and " b " point current potential is input voltage VinPositive pole,
" c " point current potential is input voltage VinNegative pole, therefore T1 both end voltage Vbc=+Vin.Coupled in reverse wi transformer T1 excitatory electricity
Flow ImLinear rise, the rate of rise areWherein LmFor coupled in reverse wi transformer T1 magnetizing inductance amount.Meanwhile coupled in reverse wi
Input voltage V is arrived at the midpoint " a " that transformer T1 is connected with output inductor L1inNegative pole beDc bus midpoint
Current potential " 0 " arrives input voltage VinNegative pole be alsoThusThis voltage difference is referred to as inversion midpoint
Voltage, so as to output inductor L1 electric current ILReverse linear declines, and flows through the electricity of coupled in reverse wi transformer two windings of T1
Flow I1、I2It is equal in magnitude, be respectively ILHalf.
(2) t1~t2：Power switch tube S 2 and power switch tube S 4 turn on, and " b " point current potential is input voltage VinNegative pole,
" c " point current potential is also input voltage VinNegative pole, therefore coupled in reverse wi transformer T1 both end voltage Vbc=0, coupled in reverse wi becomes
Depressor T1 exciting curent ImKeep constant.Meanwhile inversion mid-point voltageSo as to export filtering
Inductance L1 electric current ILReverse linear rises, and flows through the electric current I of two windings of coupled in reverse wi transformer T11、I2It is equal in magnitude, each
For ILHalf.
(3) t2~t3：Power switch tube S 2 and power switch tube S 3 turn on, and " b " point voltage is input voltage VinNegative pole,
" c " point voltage is input voltage VinPositive pole, therefore coupled in reverse wi transformer T1 both end voltage Vbc=-Vin.Coupled in reverse wi becomes
Depressor T1 exciting curent ImLinear decline, descending slope areMeanwhile inversion mid-point voltageFrom
And output inductor L1 electric current ILReverse linear declines, and flows through the electric current I of two windings of coupled in reverse wi transformer T11、I2
It is equal in magnitude, be respectively ILHalf.
(4) t3~t4：Power switch tube S 2 and power switch tube S 4 turn on, and " b " point current potential is input voltage VinNegative pole,
" c " point current potential is also input voltage VinNegative pole, therefore coupled in reverse wi transformer T1 both end voltage Vbc=0, ImKeep constant.
Meanwhile inversion mid-point voltageSo as to output inductor L1 electric current ILReverse linear rises, stream
Cross the electric current I of two windings of coupled in reverse wi transformer T11、I2It is equal in magnitude, be respectively ILHalf.
Coupled in reverse wi transformer T1 exciting curent Im two-way flows, so as to which coupled in reverse wi transformer T1 is realized reliably again
Position.It is theoretical based on the inductance voltage-second balance in a switch periods, by integral operation, the average value of output voltage can be obtained
For：
Therefore as the dutycycle D of power switch tube S 1<When 0.5, V all the time be presentout<0, working in power frequency just so as to corresponding
The negative half period of string ripple, while inversion mid-point voltage Va0Achievable 0,Two kinds of level.
Fig. 2 and Fig. 6 are referred to, as the dutycycle D of power switch tube S 1>When 0.5, in a complete switch periods, hand over
Four operation modes be present in wrong parallel single-phase tri-level half-bridge inverter.
(5) t0~t1：Power switch tube S 1 and power switch tube S 4 turn on, and " b " point current potential is input voltage VinPositive pole,
" c " point current potential is input voltage VinNegative pole, therefore coupled in reverse wi transformer T1 both end voltage Vbc=+Vin.Coupled in reverse wi becomes
Depressor T1 exciting curent ImLinear rise, the rate of rise areMeanwhile coupled in reverse wi transformer T1 and output inductor
Input voltage V is arrived at the midpoint " a " of L1 connectionsinNegative pole beDc bus midpoint potential " 0 " arrives input voltage VinIt is negative
Pole is alsoThusThis voltage difference is referred to as inversion mid-point voltage, so as to output inductor L1
Electric current ILLinear decline, flow through the electric current I of two windings of coupled in reverse wi transformer T11、I2It is equal in magnitude, be respectively ILHalf.
(6) t1~t2：Power switch tube S 1 and power switch tube S 3 turn on, and " b " point current potential is input voltage VinPositive pole,
" c " point current potential is also input voltage VinPositive pole, therefore coupled in reverse wi transformer T1 both end voltage Vbc=0, coupled in reverse wi becomes
Depressor T1 exciting curent ImKeep constant.Meanwhile inversion mid-point voltageSo as to output inductor L1 electricity
Flow ILLinear rise, flow through the electric current I of two windings of coupled in reverse wi transformer T11、I2It is equal in magnitude, be respectively ILHalf.
(7) t2~t3：Power switch tube S 2 and power switch tube S 3 turn on, and " b " point voltage is input voltage VinNegative pole,
" c " point voltage is input voltage VinPositive pole, therefore coupled in reverse wi transformer T1 both end voltage Vbc=-Vin.Coupled in reverse wi becomes
Depressor T1 exciting curent ImLinear decline, descending slope areMeanwhile inversion mid-point voltageFrom
And output inductor L1 electric current ILLinear decline, flow through the electric current I of two windings of coupled in reverse wi transformer T11、I2Size phase
Deng, be respectively ILHalf.
(8) t3~t4：Power switch tube S 1 and power switch tube S 3 turn on, and " b " point current potential is input voltage VinPositive pole,
" c " point current potential is also input voltage VinPositive pole, therefore coupled in reverse wi transformer T1 both end voltage Vbc=0, coupled in reverse wi becomes
Depressor T1 exciting curent ImKeep constant.Meanwhile inversion mid-point voltageSo as to output inductor L1 electricity
Flow ILLinear rise, flow through the electric current I of two windings of coupled in reverse wi transformer T11、I2It is equal in magnitude, be respectively ILHalf.
Coupled in reverse wi transformer T1 exciting curent ImTwo-way flow, so as to which coupled in reverse wi transformer T1 is realized reliably again
Position.It is theoretical based on the inductance voltage-second balance in a switch periods, by integral operation, the average value of output voltage can be obtained
For：
Therefore D is worked as>When 0.5, V all the time be presentout>0, thus the positive half cycle of power frequency sine wave is correspondingly worked in, while inversion
Mid-point voltage Va0Achievable 0,Two kinds of level.
By formula 2-1 and formula 2-2, it is apparent that the dutycycle D of power switch tube S 1<0.5 and power switch pipe
S1 dutycycle D>Under the conditions of 0.5, output voltage Va0 calculation formula is identical.
Referring to Fig. 7, be linear functional relation between output voltage Va0 and the dutycycle D of power switch tube S 1, therefore can
Using unified data controlling signal, meanwhile, inversion mid-point voltage Va0Realize0、Three kinds of level, with tradition
Two level inverse conversion topologys are compared, and single phase half bridge inverter circuit can realize more level outputs at inversion midpoint, so as to improve output
Harmonic wave, reduce switching device loss.Meanwhile this circuit topology use crisscross parallel software controlling strategies, reduce input,
Output current harmonics, improve the quality of power supply.
Fig. 8~9 are referred to, are closed using the linear function between output voltage Va0 and the dutycycle D of power switch tube S 1
System, unified level output data signal is carried out using SPWM modulation strategies and controlled；SPWM modulation strategy operation principles are to utilize
The positive and negative half-cycle signals of baseline sinusoidal wave Vsin produce s1 drive signals, identical benchmark more afterwards with triangular carrier Vtri respectively
The s3 compared with the triangular wave carrier of 180 ° of phase shift produces drive signal to the positive and negative half-cycle signal of sine wave signal respectively is s3, wherein
S2 drive signals and s1 drive signals are complementary, and s4 drive signals are complementary with s3 drive signals, s1 drive signals, s2 drive signals,
Crisscross parallel between s3 drive signals and s4 drive signals.
In addition, inverter also can Closed loop operation, as long as introducing output voltage or current signal compared with baseline sinusoidal wave
Afterwards, then compared with triangular carrier.
Refer to Figure 10~13, the single-phase full-bridge inverter circuit of the two-winding transformer of a coupled in reverse wi, two it is anti-
The single-phase full-bridge inverter circuit of the two-winding transformer being coupled, three-phase half-bridge inverter circuit and multiple coupling structure it is more
The basic functional principle of electrical level inverter circuit, used control drive signal are identical with single phase half bridge inverter circuit.
Referring to Fig. 10, the single-phase full-bridge inverter circuit of the two-winding transformer of a coupled in reverse wi, including one defeated
Enter filter capacitor, a coupled in reverse wi transformer, an output filter capacitor, an output inductor and by six power
The power switch of switching tube and six diode compositions.
Refer to Figure 11, the single-phase full-bridge inverter circuit of the two-winding transformer of two coupled in reverse wi, including one defeated
Enter filter capacitor, two coupled in reverse wi transformers, an output filter capacitor, two output inductors and by eight power
The power switch of switching tube and eight diode compositions.
Refer to Figure 12, three-phase half-bridge inverter circuit, including two input filter capacitors, three coupled in reverse wi transformations
Device, three output filter capacitors, three output inductors and it is made up of 12 power switch pipes and 12 diodes
Power switch.
Refer to Figure 13, the multi-electrical level inverter circuit of multiple coupling structure, including four input filter capacitors, three it is anti-
Be coupled transformer, an output filter capacitor, an output inductor and by eight power switch pipes and eight two poles
The power switch of pipe composition.
The present invention can realize that more level are defeated compared with conventional diode Clamp multi-level inverse conversion topology at inversion midpoint
Go out, so as to improve harmonic wave of output voltage, the size for reducing output inductor and volume, reduce switching device loss, therefore drop
Low system material cost, the electric property for improving inverter.
It is obvious to a person skilled in the art that the invention is not restricted to the details of above-mentioned one exemplary embodiment, Er Qie
In the case of without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter
From the point of view of which point, embodiment all should be regarded as exemplary, and be nonrestrictive, the scope of the present invention is by appended power
Profit requires rather than described above limits, it is intended that all in the implication and scope of the equivalency of claim by falling
Change is included in the present invention.Any reference in claim should not be considered as to the involved claim of limitation.
Claims (3)
- A kind of 1. more level power topology inverter systems using three-terminal switch network, it is characterised in that its inverter circuit Including input voltage, power switch, input filter capacitor, transformer, output filter capacitor and output inductor, the power supply Switch includes power switch pipe and diode, and the transformer is coupled in reverse wi transformer；Input voltage connects power supply and opened respectively Close and input filter capacitor, input filter capacitor connection power switch, power switch pass sequentially through transformer and output filtered electrical Sense connection output filter capacitor.
- 2. a kind of more level power topology inverter systems using three-terminal switch network according to claim 1, it is special Sign is that filter inductance L1 has two kinds of forms, and one kind is a coupled in reverse wi transformer T1 and an output inductor L1 Conventional structure, another kind is that independent output inductor is integrated into the two-winding transformer of coupled in reverse wi；The filter Core structure in ripple inductance is E-type magnetic cored structure or annular mixing core structure, the magnetic core material in the filter inductance are Ferrite, amorphous or powder core material；The power switch pipe is insulated gate bipolar transistor, metal oxide semiconductcor field effect Answering transistor OR gate pole can break IGCT.
- A kind of 3. control using the more level power topology inverter systems for using three-terminal switch network as claimed in claim 1 Mode processed, it is characterised in that using the linear functional relation between output voltage Va0 and the dutycycle D of power switch tube S 1, adopt Unified level output data signal is carried out with SPWM modulation strategies to control；SPWM modulation strategy operation principles are to utilize benchmark just The positive and negative half-cycle signals of string ripple Vsin produce s1 drive signals, identical baseline sinusoidal wave more afterwards with triangular carrier Vtri respectively The s3 compared with the triangular wave carrier of 180 ° of phase shift produces drive signal to the positive and negative half-cycle signal of signal respectively be s3, and wherein s2 drives Signal is complementary with s1 drive signals, and s4 drive signals are complementary with s3 drive signals, s1 drive signals, s2 drive signals, s3 drivings Crisscross parallel between signal and s4 drive signals.
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