CN103178742B - A kind of combined bidirectional DC/AC converter topologies - Google Patents
A kind of combined bidirectional DC/AC converter topologies Download PDFInfo
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- CN103178742B CN103178742B CN201310088405.0A CN201310088405A CN103178742B CN 103178742 B CN103178742 B CN 103178742B CN 201310088405 A CN201310088405 A CN 201310088405A CN 103178742 B CN103178742 B CN 103178742B
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Abstract
A kind of combined bidirectional DC/AC converter topologies, belong to power converter technical field, it is characterized in that, the topology is made of identical three-phase circuit, each phase is composed of isolated half-bridge DC/DC current transformer and tandem type H bridge DC/AC current transformer, the output-parallel first capacitor device of isolated half-bridge DC/DC current transformer（C1）The input as tandem type DC/AC current transformer single-stage H bridge, every level-one H bridge are connected with independent isolated half-bridge DC/DC current transformer afterwards；Show that there is the topological structure very wide voltage matches ability to be able to achieve the two-way flow of energy by means of phase shifting control by the EMTDC electromagnetic transient simulation carried out to the circuit topology under canonical parameter；Topology proposed by the present invention can be applied to the occasions such as the frequency modulation and voltage modulation in the high-power adjusting based on battery energy storage, energy-accumulating power station, smooth renewable energy power generation output power and micro-capacitance sensor, have broad application prospects.
Description
Technical field
The invention belongs to power converter technical field more particularly to a kind of combined bidirectional DC/AC converter topologies.
Background technique
The problem of renewable energy power generation technology is the research hotspot that current countries in the world are competitively chased, and there are two aspects is outstanding
Its is noticeable.
First, being caused grid-connected due to the possessed intermittent and fluctuation of the renewable energy such as wind energy and solar energy
Renewable energy electric energy brings great challenge to the stabilization of electric system and control.Friendly, schedulable renewable energy
Source electric energy is the target that people yearn for and pursue.And energy storage and power compensation technology are the key of solving the problem, and compel to be essential
It can be realized the Unified Power converting means of reactive compensation and two-way active power regulation.
Second, new and effective, inexpensive large-scale renewable energy power generation current transformer research is also current hot spot.With light
For volt power generation, the technical solution of " inversion+boosting+confluence " is mostly used greatly at present.Due to current commercial maximum capacity monomer
Battery is 500kW with inverter capacity, need to use 200 photovoltaic cell inverters and 100 for hundred megawatts of photovoltaic plants
Platform three winding transformer with split winding.Hardware cost is high and takes up a large area, and significantly limits the utilization and extention of photovoltaic power generation technology,
Need the small technical solution of research and development low cost, occupied area.
Dedoncker R W etc. has applied for Power conversion apparatus for DC-DC conversion
Using dual active bridges United States Patent (USP)（U.S. Patent No:5027264）, propose by two square wave inputs
Voltage and power regulation, and zero voltage switch is realized by means of transformer leakage inductance and external inductance.Chinese utility model patent
CN 202617004U is improved on this basis, has obtained a kind of isolation type bidirectional DC/DC converter.And classical cascade
Series connection of the formula H bridge DC/AC converter based on multiple single-phase electricity die mould full bridge inverter units, by means of control plan appropriate
Slightly, it can be achieved that the two-way flow of power in AC and DC side.If the two is improved and is organically blended, it can be achieved that bidirectional high-efficiency
The power conversion of DC/AC.
The present invention proposes that a kind of novel combined bidirectional DC/AC converter topologies, the topology are based on flexibly becoming
" the isolated form half-bridge DC/DC converter " of shape and it is directly incorporated into the group for exchanging " the tandem type H bridge DC/AC converter " of side power grid
It closes, be able to achieve exchange side with the active power two-way flow of DC side and exchange the reactive compensation of side system, and with very wide
Voltage matches ability.Suitable for the active adjusting and reactive compensation of renewable energy power generation factory, large-sized photovoltaic power station it is grid-connected,
The occasions such as the frequency modulation and voltage modulation of micro-capacitance sensor, have broad application prospects.
Summary of the invention
It can be applied to but be not limited to the occasions such as power regulation and photovoltaic electric station grid connection the object of the present invention is to provide a kind of
Combined bidirectional DC/AC converter topologies reduce it to power grid for the output power of smooth renewable energy power generation
Adverse effect such as impact etc..
Technical solution of the present invention：
A kind of combined bidirectional DC/AC converter topologies, the topology are made of identical three-phase circuit, each phase by
Isolated half-bridge DC/DC current transformer and tandem type H bridge DC/AC current transformer are composed, and the output of isolated half-bridge DC/DC current transformer is simultaneously
Join input as tandem type DC/AC current transformer single-stage H bridge after first capacitor device, every level-one H bridge with independent isolated half-bridge
DC/DC current transformer is connected.
Isolated half-bridge DC/DC current transformer includes first switch tube, second switch, third switching tube, the 4th switching tube, and
Two capacitors, third capacitor, the 4th capacitor, the 5th capacitor, high-frequency isolation transformer, power filter inductance, resonance electricity
Sense；It is connected：The anode of DC power supply is connected in the bridge being made of first switch tube and second switch after power filter inductance
On arm, it is in parallel which with the second capacitor and third capacitor forms another bridge arm, the output of two bridge arms through resonant inductance simultaneously
It is coupled to the primary side of high-frequency isolation transformer, the secondary side output of high-frequency isolation transformer is connected in by the 4th capacitor and the 5th electricity
On the bridge arm of container composition.
Tandem type H bridge DC/AC current transformer include the 5th switching tube, the 6th switching tube, the 7th switching tube, the 8th switching tube,
First output inductor, the second output inductor；It is connected：5th switching tube and the 7th switching tube composition left bridge arm with
The right bridge arm of 6th switching tube and the 8th switching tube composition is parallel to first capacitor device, the 5th switching tube and the 7th switching tube group
At an output end of left bridge arm connection the first output inductor of output as the combined bidirectional DC/AC current transformer,
And the right bridge arm of the 6th switching tube and the 8th switching tube composition is connected to the left bridge arm of next stage H bridge, with this rule cascade until most
Rear stage H bridge, the right bridge arm of afterbody H bridge is through the second output inductor as the combined bidirectional DC/AC current transformer
Another output.
First output inductor of tandem type H bridge DC/AC current transformer and the reactance value of the second output inductor are zero
Or it is not zero.
The various switching tubes of isolated half-bridge DC/DC current transformer and tandem type H bridge DC/AC current transformer are that metal oxide layer is partly led
Body field effect transistor or insulated gate bipolar transistor, and equal anti-parallel diodes.
The exchange side of tandem type DC/AC current transformer is connected with three phase network or is connected with AC load.
The invention has the advantages that：
1）Isolated half-bridge DC/DC current transformer has flexible and changeable topological structure, can pass through the multiple voltage multiplications of input side
The series connection of device improves the voltage gain of current transformer, passes through the function in parallel for improving current transformer of the multiple power diode branches of outlet side
Rate.
2）The transformation tune to DC voltage can be realized by adjusting the switching tube duty ratio of isolated half-bridge DC/DC current transformer
Section has very wide voltage matches ability, in input side（Generally connect battery pack）Under conditions of voltage fluctuation is very big, it can maintain defeated
Side DC bus-bar voltage is constant out, to ensure the normal operation of tandem type H bridge DC/AC converter.
3）Phase shifting angle by adjusting isolated half-bridge DC/DC current transformer high frequency transformer two sides switching tube can carry out power
It adjusts, and can realize the two-way flow of energy.
4）Isolated half-bridge DC/DC current transformer can work under higher switching frequency, can greatly reduce isolating transformer
Volume and cost.
5）By the cascade system of multiple H bridges, device can be made to be directly accessed high-voltage fence（10kV or 35kV）, eliminate
Grid-connected transformer, further decreases installation cost.
Detailed description of the invention
Fig. 1 is combined bidirectional DC/AC converter topologies of the present invention.
Fig. 2 is the S1 as DC voltage U1=U2=Un=60V, when control power is from DC side to exchange side output 6kW
Waveform is cut-off with S3.
Fig. 3 is resonance when control power is from DC side to exchange side output 6kW as DC voltage U1=U2=Un=60V
The stable state waveform of the voltage Up0 and Up1 of the two sides inductance Ls.
Fig. 4 is to export when control power is from DC side to exchange side output 6kW as DC voltage U1=U2=Un=60V
The transient-wave of power.
Fig. 5 is the S1 as DC voltage U1=U2=Un=48V, when control power is from DC side to exchange side output 6kW
Waveform is cut-off with S3.
Fig. 6 is to export when control power is from DC side to exchange side output 6kW as DC voltage U1=U2=Un=48V
The transient-wave of power.
Fig. 7 is as DC voltage U1=U2=Un=60V, and control power exports S1 when 6kW from exchange side to DC side
Waveform is cut-off with S3.
Fig. 8 is as DC voltage U1=U2=Un=60V, and control power exports when exporting 6kW from exchange side to DC side
The transient-wave of power.
Fig. 9 is the first deformation topology of combined bidirectional DC/AC current transformer of the present invention.
Figure 10 is second of deformation topology of combined bidirectional DC/AC current transformer of the present invention.
Specific embodiment
As shown in Figure 1, a kind of combined bidirectional DC/AC converter topologies, by isolated half-bridge DC/DC current transformer and grade
Connection formula H bridge DC/AC current transformer is composed, and grade is used as after the output-parallel first capacitor device C1 of isolated half-bridge DC/DC current transformer
The input of connection formula DC/AC current transformer single-stage H bridge, every level-one H bridge are connected with independent isolated half-bridge DC/DC current transformer.Isolation
Half-bridge DC/DC current transformer includes first switch tube S1, second switch S2, the third switching tube electricity of S3, the 4th switching tube S4, second
Container C2, third capacitor C3, the 4th capacitor C4, the 5th capacitor C5, high-frequency isolation transformer T, power filter inductance Li,
Resonant inductance Ls；The anode of DC power supply U1 is connected in after power filter inductance Li by first switch tube S1 and second switch S2
On the bridge arm of composition, which forms another bridge arm parallel connection, the output of two bridge arms with the second capacitor C2 and third capacitor C3
It is parallel to the primary side of high-frequency isolation transformer T through resonant inductance Ls, the secondary side output of high-frequency isolation transformer T is connected in by the
On the bridge arm of four capacitor C4 and the 5th capacitor C5 composition.Tandem type H bridge DC/AC current transformer includes the 5th switching tube S5, the
The six switching tube output inductor of S6, the 7th switching tube S7, the 8th switching tube S8, first Lo1, the second output inductor Lo2；
The left bridge arm of 5th switching tube S5 and the 7th switching tube S7 composition and the right bridge of the 6th switching tube S6 and the 8th switching tube S8 composition
Arm is parallel to left bridge arm connection the first output of output of first capacitor device C1, the 5th switching tube S5 and the 7th switching tube S7 composition
An output end of the filter inductance Lo1 as the combined bidirectional DC/AC current transformer, and the switch of the 6th switching tube S5 and the 8th
The right bridge arm of pipe S8 composition is connected to the left bridge arm of next stage H bridge, cascades to the last level-one H bridge, afterbody H bridge with this rule
Another output of the right bridge arm through the second output inductor Lo2 as the combined bidirectional DC/AC current transformer.
The reactance of the first output inductor Lo1 and the second output inductor Lo2 of tandem type H bridge DC/AC current transformer
Value is zero or is not zero.
The various switching tubes of isolated half-bridge DC/DC current transformer and tandem type H bridge DC/AC current transformer are that metal oxide layer is partly led
Body field effect transistor M OSFET or insulated gate bipolar transistor IGBT, and equal anti-parallel diodes.
The exchange side of tandem type DC/AC current transformer is connected with three phase network or is connected with AC load.
The exemplary operation waveform of the combined bidirectional DC/AC current transformer is given below, to illustrate its advantage.It takes in Fig. 1
Li=2mH, the μ of Ls=240 H, C1=3mF, C2=C3=C4=C5=10mF, Lo1=Lo2=0, transformer voltage ratio 1:1, it utilizes
PSCAD/EMTDC carries out electromagnetic transient simulation.Fig. 2 is to control power from DC side as DC voltage U1=U2=Un=60V
S1 and S3 when exporting 6kW to exchange side cut-off waveform, and Fig. 3 is the Steady Wave of the voltage Up0 and Up1 of the two sides resonant inductance Ls
Shape, Fig. 4 are the transient-wave of output power.As seen from the figure, after providing power instruction within 1.0 seconds, by controlling isolated half-bridge DC/
The duty of DC transformer two sides switching tube when phase shifting angle, the output power of current transformer have reached required steady in 0.5s
State.
Fig. 5 ~ Fig. 6 is respectively to change DC voltage S1 and S3 when U1=U2=Un=48V is made to cut-off waveform and output power
Transient-wave.Comparison diagram 5 and Fig. 2 pass through reduction isolated half-bridge DC/DC transformer two it is found that when DC voltage reduces
The duty ratio of side switching tube realizes the transformation adjusting to DC voltage, and the topology is made to have very wide voltage matches ability.
Fig. 7 ~ Fig. 8 respectively control power is from exchange side to DC side when output 6kW, DC voltage U1=U2=Un=60V
S1 and S3 cut-off the transient-wave of waveform and output power.Comparison diagram 7 and Fig. 2 are it is found that by adjusting isolated half-bridge DC/DC
The phase shifting angle of current transformer high frequency transformer two sides switching tube realizes the two-way flow of energy.
The present invention DC/DC circuit in the combined bidirectional DC/AC current transformer in the specification and in the claims
Input side voltage multiplier series connection series N be 1, the parallel branch number P of output power diode branch is also 1, be it is a kind of most
Basic topology.It, can be with as shown in Fig. 9 ~ Figure 10 in addition to the Basic Topological being previously mentioned in specification and claims
It is several deformations of the basic topology obtained on the basis of working principle is constant, Fig. 5 is N=1, deformation topology when P=2, and Fig. 6 is
Deformation topology when N=2, P=1.It is, therefore, to be understood that present invention is not limited to the above embodiments, there can also be many changes
Shape.All deformations that those skilled in the art directly can export or associate from present disclosure, should all
It is considered protection scope of the present invention.
There is topological structure proposed by the invention very wide voltage matches ability to be able to achieve energy by means of phase shifting control
The two-way flow of amount.It can be applied to high-power adjusting, energy-accumulating power station, the output of smooth renewable energy power generation based on battery energy storage
The occasions such as the frequency modulation and voltage modulation in power and micro-capacitance sensor, have broad application prospects.
Claims (6)
1. a kind of combined bidirectional DC/AC converter topologies, which is characterized in that the topology is by identical three-phase circuit group
At each phase is composed of isolated half-bridge DC/DC current transformer and tandem type H bridge DC/AC current transformer, and isolated half-bridge DC/DC becomes
The input as tandem type DC/AC current transformer single-stage H bridge, every level-one H bridge are equal afterwards for the output-parallel first capacitor device (C1) of stream device
It is connected with independent isolated half-bridge DC/DC current transformer；
Wherein, the isolated half-bridge DC/DC current transformer is one of following two structure：
Structure one：Including the 9th switching tube (S9), the tenth switching tube (S10), the 11st switching tube (S11), the 12nd switching tube
(S12), the 6th capacitor (C6), the 7th capacitor (C7), the 8th capacitor (C8), the 9th capacitor (C9), the first high frequency every
From transformer (T1), the second high-frequency isolation transformer (T2), the first power filter inductance (Li1), second source filter inductance
(Li2), the first resonant inductance (Ls1), the second resonant inductance (Ls2)；Wherein, the anode of DC power supply (U1) is filtered through second source
It is connected in after wave inductance (Li2) on the first bridge arm being made of the 9th switching tube (S9) and the tenth switching tube (S10), DC power supply
(U1) anode is connected in after the first power filter inductance (Li1) by the 11st switching tube (S11) and the 12nd switching tube (S12)
On second bridge arm of composition, first bridge arm and second bridge arm are the same as the 6th capacitor (C6) and the 7th capacitor (C7) group
At another bridge arm it is in parallel, the output of first bridge arm is parallel to the first high-frequency isolation transformation through the first resonant inductance (Ls1)
The output of the primary side of device (T1), second bridge arm is parallel to the second high-frequency isolation transformation through the second resonant inductance (Ls2)
The secondary side of the primary side of device (T2), first high-frequency isolation transformer (T1) and the second high-frequency isolation transformer (T2) exports
Parallel connection is connected on the bridge arm being made of the 8th capacitor (C8) and the 9th capacitor (C9), the cathode and the tenth of DC power supply (U1)
Switching tube (S10), the 12nd switching tube (S12), the 7th capacitor (C7) altogether, and
Structure two：Including the 17th switching tube (S17), eighteenmo closes pipe (S18), and the 19th switching tube (S19), the 20th opens
It closes and manages (S20), the 21st switching tube (S21), the 22nd switching tube (S22), the 23rd switching tube (S23), the 20th
Four switching tubes (S24), the tenth capacitor (C10), the 11st capacitor (C11), the 12nd capacitor (C12), the 13rd capacitor
Device (C13), the 14th capacitor (C14), the 15th capacitor (C15), third high-frequency isolation transformer (T3), the 4th high frequency every
From transformer (T4), third power filter inductance (Li3), the 4th power filter inductance (Li4), third resonant inductance (Ls3),
Four resonant inductances (Ls4)；Wherein, the anode of DC power supply (U1) is connected in after the 4th power filter inductance (Li4) by the 17th
Switching tube (S17) and eighteenmo close on the third bridge arm of pipe (S18) composition, and the anode of DC power supply (U1) is filtered through third power supply
It is connected in after wave inductance (Li3) on the four bridge legs being made of the 19th switching tube (S19) and the 20th switching tube (S20), it is described
Another bridge arm that third bridge arm and the four bridge legs are formed with the tenth capacitor (C10) and the 11st capacitor (C11) is in parallel,
The output of third bridge arm is parallel to the primary side of third high-frequency isolation transformer (T3), the 4th bridge through third resonant inductance (Ls3)
The output of arm is parallel to the primary side of the 4th high-frequency isolation transformer (T4), the 21st switch through the 4th resonant inductance (Ls4)
Manage (S21), the 22nd switching tube (S22), the 23rd switching tube (S23), the 24th switching tube (S24) one bridge of composition
Arm, one end of third high-frequency isolation transformer (T3) secondary side are connected to the 21st switching tube (S21) and the 22nd switch
It manages between (S22), the other end of third high-frequency isolation transformer (T3) secondary side is connected to the 12nd capacitor (C12) and the tenth
Between three capacitors (C13), one end of the 4th high-frequency isolation transformer (T4) secondary side is connected to the 23rd switching tube (S23)
Between the 24th switching tube (S24), the other end of the 4th high-frequency isolation transformer (T4) secondary side is connected to the 14th electricity
Between container (C14) and the 15th capacitor (C15), third high-frequency isolation transformer (T3) and the 4th high-frequency isolation transformer
(T4) secondary side output series connection is connected in by the 12nd capacitor (C12), the 13rd capacitor (C13), the 14th capacitor
(C14) and on the bridge arm of the 15th capacitor (C15) composition, the cathode and eighteenmo of DC power supply (U1), which close, manages (S18), the
20 switching tubes (S20), the 11st capacitor (C11) are altogether.
2. a kind of combined bidirectional DC/AC current transformer according to claim 1, tandem type H bridge DC/AC current transformer includes the
Five switching tubes (S5), the 6th switching tube (S6), the 7th switching tube (S7), the 8th switching tube (S8), the first output inductor
(Lo1), the second output inductor (Lo2)；It is characterized in that, a left side for the 5th switching tube (S5) and the 7th switching tube (S7) composition
The right bridge arm of bridge arm and the 6th switching tube (S5) and the 8th switching tube (S8) composition is parallel to first capacitor device (C1), and the 5th opens
It closes pipe (S5) and connects output the first output inductor (Lo1) with the left bridge arm that the 7th switching tube (S7) forms as the combination
One output end of the two-way DC/AC current transformer of formula, and the right bridge arm of the 6th switching tube (S6) and the 8th switching tube (S8) composition connects
To the left bridge arm of next stage H bridge, with this rule cascade, to the last level-one H bridge, the right bridge arm of afterbody H bridge are exported through second
Another output of the filter inductance (Lo2) as the combined bidirectional DC/AC current transformer.
3. a kind of combined bidirectional DC/AC current transformer according to claim 2, which is characterized in that first output
The reactance value of filter inductance (Lo1) and the second output inductor (Lo2) is zero, or is not zero.
4. a kind of combined bidirectional DC/AC current transformer according to claim 1, which is characterized in that the various switches
Pipe is metal oxide layer semiconductor field effect transistor (MOSFET) or insulated gate bipolar transistor (IGBT), and anti-
To parallel diode.
5. a kind of combined bidirectional DC/AC current transformer according to claim 1, which is characterized in that the exchange same three-phase electricity in side
Net is connected, or is connected with AC load.
6. a kind of combined bidirectional DC/AC current transformer according to claim 1, which is characterized in that inverter can be used as
Supply exchange side active power also can be DC side power source charges as rectifier, moreover it is possible to issue reactive power, provide idle benefit
It repays.
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| CN107769389B (en) * | 2017-10-24 | 2023-08-22 | 华南理工大学 | Battery energy storage system of isolation symmetrical series flyback circuit |
| CN108111035A (en) * | 2018-01-31 | 2018-06-01 | 阳光电源股份有限公司 | A kind of photovoltaic solid-state transformer, photovoltaic inverting system and bidirectional high-pressure current transformer |
| CN110868075B (en) * | 2019-10-24 | 2022-07-12 | 北京机械设备研究所 | Bidirectional DC/DC converter and working method thereof |
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| CN101707443A (en) * | 2009-11-20 | 2010-05-12 | 中国电力科学研究院 | Novel electric power electric transformer |
| CN102097966A (en) * | 2011-02-14 | 2011-06-15 | 东南大学 | Cascade megawatt photovoltaic grid-connected inverter |
| CN102222958A (en) * | 2011-06-21 | 2011-10-19 | 清华大学深圳研究生院 | Vehicle-mounted bidirectional charger for electric automobile |
| CN102332839A (en) * | 2011-08-23 | 2012-01-25 | 南京航空航天大学 | Cascade type time-interval variable-order multi-level static converter |
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| CN103178742A (en) | 2013-06-26 |
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