[go: up one dir, main page]

CN105978370B - A kind of sinusoidal power transmission method improving electric power electric transformer power density - Google Patents

A kind of sinusoidal power transmission method improving electric power electric transformer power density Download PDF

Info

Publication number
CN105978370B
CN105978370B CN201610392644.9A CN201610392644A CN105978370B CN 105978370 B CN105978370 B CN 105978370B CN 201610392644 A CN201610392644 A CN 201610392644A CN 105978370 B CN105978370 B CN 105978370B
Authority
CN
China
Prior art keywords
power
phase
converter
fluctuation
voltage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN201610392644.9A
Other languages
Chinese (zh)
Other versions
CN105978370A (en
Inventor
刘海军
刘闯
蔡国伟
齐瑞鹏
李文鑫
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
State Grid Corp of China SGCC
Global Energy Interconnection Research Institute
State Grid Liaoning Electric Power Co Ltd
Northeast Electric Power University
Original Assignee
State Grid Corp of China SGCC
Northeast Dianli University
Global Energy Interconnection Research Institute
State Grid Liaoning Electric Power Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by State Grid Corp of China SGCC, Northeast Dianli University, Global Energy Interconnection Research Institute, State Grid Liaoning Electric Power Co Ltd filed Critical State Grid Corp of China SGCC
Priority to CN201610392644.9A priority Critical patent/CN105978370B/en
Publication of CN105978370A publication Critical patent/CN105978370A/en
Application granted granted Critical
Publication of CN105978370B publication Critical patent/CN105978370B/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • H02M7/02—Conversion of AC power input into DC power output without possibility of reversal
    • H02M7/04—Conversion of AC power input into DC power output without possibility of reversal by static converters
    • H02M7/12—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/21—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/217—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M7/219—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J5/00—Circuit arrangements for transfer of electric power between AC networks and DC networks
    • 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
    • H02M3/33569—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 several active switching elements
    • H02M3/33576—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 several active switching elements having at least one active switching element at the secondary side of an isolation transformer
    • H02M3/33584—Bidirectional converters

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)
  • Inverter Devices (AREA)

Abstract

本发明公开了一种提高电力电子变压器功率密度的正弦功率传输方法，分别通过电力电子变压器的三相电路传递到三相公共低压直流侧，所述正弦功率传输方法包括A相功率波动传递、B相功率波动传递和C相功率波动传递，所述电力电子变压器由基于级联的AC‑DC变换器、中间直流电容及DC‑DC变换器按照三相系统结构结合构成。本发明所提供的三相电力电子变压器便于不同电压等级交直流混合型电网的互联，所提供的正弦功率传输方法实现了不同额定电压等级交直流母线间有功功率协调变换，突破传统电力电子变压器体积和制造成本，满足了未来交直流混合型智能配电网互联发展需求。

The invention discloses a sinusoidal power transmission method for improving the power density of a power electronic transformer. Phase power fluctuation transmission and C-phase power fluctuation transmission, the power electronic transformer is composed of a cascade-based AC-DC converter, an intermediate DC capacitor and a DC-DC converter according to a three-phase system structure. The three-phase power electronic transformer provided by the invention is convenient for the interconnection of AC/DC hybrid power grids of different voltage levels, and the provided sinusoidal power transmission method realizes the coordinated transformation of active power between AC and DC buses of different rated voltage levels, and breaks through the volume of traditional power electronic transformers. and manufacturing costs, meeting the future development needs of the AC-DC hybrid intelligent distribution network interconnection.

Description

A kind of sinusoidal power transmission method improving electric power electric transformer power density
Technical field
The present invention relates to flexible VSC transformation and direct current transformation technologies, and in particular to a kind of raising electric power electric transformer function The sinusoidal power transmission method of rate density.
Background technique
The following power distribution network will be extensive interconnection, height intelligence, open interaction " energy internet " main carriers, can be with Realize the optimization of production of energy, transmission, dispatching, conversion, consumption in wide scope.In addition to undertake electric energy dispatching task it Outside, the following power distribution network also needs to realize the exchange and distribution of the energy in region, and meets the need of distributed generation resource access and consumption It asks.
As the crucial component devices of AC distribution net, traditional Industrial Frequency Transformer realizes transformation, isolation using power frequency iron core With the basic functions such as energy transmission, controllability, compatibility are poor, far from meeting novel AC-DC mixing power distribution network to electricity The requirement of gas device intelligence level.Electric power electric transformer (Power Electronics Transformers, PETs) is made It is by electric power for the core component of new distribution net, also known as solid-state transformer (Solid-State Transformer, SST) Electronic power converter technique and electromagnetic induction high-frequency isolation technology combine, and realize that electric energy alternating current-direct current mixes flexible control, are not Carry out the energy source router of energy internet terminal.
Electric power electric transformer generallys use cascading multiple electrical level system structure at present, is taken by Y-shaped or " Δ " type Build three-phase system structure.In order to be engineered electric power electric transformer really, in addition to taking into account high efficiency, high output performance Outside, its overall power density should be also improved, spatial volume is reduced, reduces cost.However for cascade connection type system, handed over to reduce Galvanic electricity net secondary power fluctuates the influence to low-voltage direct side power, and conventional practice is among cascade connection type electric power electric transformer DC side parallel bulky capacitor limits the transmitting of power swing.Thin-film capacitor is used in order to increase system reliability simultaneously, more The volume for increasing electric power electric transformer, reduces power density, improves cost.
Summary of the invention
To solve the above problems, the present invention provides a kind of sinusoidal power biographies for improving electric power electric transformer power density Transmission method is support with conventional three-phase ac bus, realizes that different grade of rated voltage are handed over by three-phase power electronic transformer Active power coordinates transformation between DC bus, is provided simultaneously with the high-low pressure exchange idle decoupling control function in side, is to following mostly electric Press the important breakthrough of grade alternating current-direct current hybrid power distribution network interconnection power transmission, can volume to electric power electric transformer and at Originally it substantially reduces, while improving power density.
To achieve the above object, the technical scheme adopted by the invention is as follows:
A kind of sinusoidal power transmission method improving electric power electric transformer power density, passes through power electronics transformation respectively The three-phase circuit of device is transmitted to three-phase common low pressure DC side, when power swing is transmitted to low pressure public direct-current side, due to handing over It flows side three-phase current and voltage is all power frequency sine wave, three phase power is respectively
Three phase power fluctuation is twice of fundamental frequency fluctuation and three-phase symmetrical, when power swing is transmitted to low pressure public direct-current When side, since intermediate dc lateral capacitance does not undertake three phase power fluctuation, the three phase power of low-voltage direct side fluctuates Pdca, PdcbWith PdccIt is similarly twice of fundamental frequency fluctuation and three-phase symmetrical, the function of three-phase symmetrical system theoretical according to three-phase symmetrical system power Rate fluctuation is zero, therefore public direct-current side power Pdc(t)=Pdca+Pdcb+PdccThe fluctuation of very little will be had.
The sinusoidal power transmission method includes the transmitting of A phase power swing, the transmitting of B phase power swing and C phase power swing Transmitting, the electric power electric transformer by based on cascade AC-DC converter, intermediate dc capacitor and DC-DC converter according to Three-phase system structure is bonded, and AC-DC converter exchange is flanked into high voltage AC bus, DC side series connection access intermediate dc Lateral capacitance C2；Intermediate dc lateral capacitance C2Both ends are connect with AC-DC converter and DC-DC converter respectively；DC-DC converter packet Include DC-AC converter, high frequency transformer and AC-DC converter, DC-AC converter DC side and intermediate dc lateral capacitance C2String Connection；High frequency transformer side is connected with the side that exchanges of DC-AC converter, and the other side is connected with exchanging for AC-DC converter；AC- DC converter exchange side is connected with high frequency transformer, and DC side is connect with low-voltage direct bus, and A phase, B phase are identical as C phase structure, Three-phase circuit is all connected in parallel in low-voltage direct bus bar side.
Wherein, A phase power swing transmitting ac-side current and voltage are power frequency sine wave, respectively iac=Imsinω0T and vac=Vmsinω0t；Its power Pa(t)=VmIm sin2ω0T is twice of fundamental frequency fluctuation, and A phase power swing passes through AC-DC converter to low pressure public direct-current side flow, when being transmitted to intermediate dc side, according to sinusoidal power transmit method, Reduce the intermediate dc lateral capacitance C of A phase2Capacitance, intermediate dc lateral capacitance do not need to undertake from AC network A phase and transmit The power swing come, therefore the P in intermediate dc lateral capacitanceripaFluctuation amplitude very little；Power swing will continue to become by DC-DC Parallel operation is transmitted to low-voltage direct side, and the power swing of low-voltage direct side is Pdca
Wherein, B phase power swing transmitting ac-side current and voltage are power frequency sine wave, respectively iac=Imsin (ω0T-120 °) and vac=Vmsin(ω0t-120°)；Its power Pb(t)=VmImsin2(ω0T-120 °) it is twice of fundamental frequency frequency Rate fluctuation, B phase power swing is flowed by AC-DC converter to low pressure public direct-current side, when being transmitted to intermediate dc side, root According to the method that sinusoidal power transmits, reduce the intermediate dc lateral capacitance C of B phase2Capacitance, intermediate dc lateral capacitance do not need to hold Carry on a shoulder pole the power swing passed over from AC network B phase, therefore the P in intermediate dc lateral capacitanceripbFluctuation amplitude very little, power Fluctuation will continue to be transmitted to low-voltage direct side by DC-DC converter, and the power swing of low-voltage direct side is Pdcb。
Wherein, the C phase power swing transmitting ac-side current and voltage are power frequency sine wave, respectively iac= Imsin(ω0T+120 °) and vac=Vmsin(ω0t+120°)；Its power Pc(t)=VmIm sin2(ω0T+120 °) it is twice of base Frequency frequency fluctuation, C phase power swing is flowed by AC-DC converter to low pressure public direct-current side, when being transmitted to intermediate dc side When, according to the method that sinusoidal power transmits, reduce the intermediate dc lateral capacitance C of C phase2Capacitance, intermediate dc lateral capacitance is not Need to undertake the power swing passed over from AC network C phase, therefore the P of intermediate dc sideripcFluctuation amplitude very little, power Fluctuation will continue to be transmitted to low-voltage direct side by DC-DC converter, and the power swing of low-voltage direct side is Pdcc。
Wherein, the AC-DC converter is based on cascade submodule building, and cascade submodule includes bridge-type VSC converter.
Wherein, the intermediate dc capacitor C2It is made of the capacitor of three-phase low-capacitance.
Wherein, the DC-DC converter is based on submodule building in parallel, and cascade submodule includes controlled resonant converter.
Wherein, the AC-DC converter and DC-DC converter have power transfer.
The invention has the following advantages:
1) sinusoidal power transmission method provided by the invention is, it can be achieved that active between different grade of rated voltage alternating current-direct current buses Transformation is coordinated in power mixing；
2) sinusoidal power transmission method provided by the invention can effectively extend the intermediate dc side electricity of electric power electric transformer Hold service life, improves the safety of capacitor；
3) sinusoidal power transmission method provided by the invention can effectively increase three-phase cascade connection type electric power electric transformer Power density, reduce three-phase cascade connection type system manufacturing cost；
4) sinusoidal power transmission method provided by the invention can effectively reduce electric power electric transformer intermediate dc side electricity Hold power swing, the dynamic response of three-phase cascade connection type electric power electric transformer is made to become faster；
5) sinusoidal power transmission method provided by the invention is, it can be achieved that combined modular designs.
Detailed description of the invention
Fig. 1 is the base that the three-phase cascade connection type two-stage type electric power electric transformer of power transmission can be achieved in the embodiment of the present invention This structure chart；
Fig. 2 is the system for the sinusoidal power transmission method that the embodiment of the present invention improves electric power electric transformer power density Figure；
Fig. 3 is AC/DC converter sub-modular structure figure in three-phase cascade connection type electric power electric transformer in the embodiment of the present invention；
Fig. 4 is the sub-modular structure of DC/DC converter in three-phase cascade connection type electric power electric transformer in the embodiment of the present invention Figure.
Specific embodiment
In order to which objects and advantages of the present invention are more clearly understood, the present invention is carried out with reference to embodiments further It is described in detail.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to limit this hair It is bright.
As shown in Figure 1, the embodiment of the invention provides a kind of three-phase cascade connection type two-stage type electric power of achievable power transmission Electronic transformer, the electronic transformer is by being based on cascade AC-DC converter 1, intermediate dc capacitor 2 and DC-DC converter 3 It is bonded according to three-phase system structure, the exchange of AC-DC converter 1 is flanked into high voltage AC bus, and DC side is connected in access Between DC bus capacitor C22；Intermediate dc lateral capacitance C22 both ends are connect with AC-DC converter 1 and DC-DC converter 3 respectively；DC- DC converter 3 includes DC-AC converter, high frequency transformer and AC-DC converter, DC-AC converter DC side and intermediate dc Lateral capacitance C22 series connection；High frequency transformer side is connected with the side that exchanges of DC-AC converter, the friendship of the other side and AC-DC converter Stream is connected；AC-DC converter exchange side is connected with high frequency transformer, and DC side is connect with low-voltage direct bus, A phase, B phase and C Phase structure is identical, and three-phase circuit is all connected in parallel in low-voltage direct bus bar side.
For conventional three-phase ac-dc conversion system, because the three-phase alternating current side electric current and voltage of Y type or the connection of Δ type are all It is power frequency sine wave, so its power is transmitted by electric power electric transformer to DC side with twice of fundamental frequency fluctuation.In order to So that this power swing is not transferred to low-voltage direct side, guarantees that the low-voltage direct side power stability being connected in parallel is constant, tradition The practice is to install large volume, large bulk capacitance C in the intermediate dc side of three-phase cascade connection type electric power electric transformer2To inhibit power Fluctuation.
Sinusoidal power transmission method provided by the invention based on three-phase cascade connection type electric power electric transformer is to pass through reduction Intermediate dc lateral capacitance C2, guarantee that the fluctuation of exchange side three phase power can be passed by the three-phase circuit of electric power electric transformer respectively It is delivered to common low pressure DC side, theoretical according to three-phase symmetrical system power, the fluctuation of three-phase instantaneous power is zero, so three-phase cascades The power of type electric power electric transformer common low pressure DC side does not influence.Therefore sinusoidal power transmission method, can be in not shadow While ringing high-voltage alternating side and common low pressure DC side power, the effective volume for reducing intermediate dc lateral capacitance, to subtract The volume and manufacturing cost of few three-phase cascade connection type electric power electric transformer, increase the power density of electric power electric transformer.
As shown in Fig. 2, the embodiment of the invention provides a kind of sinusoidal powers for improving electric power electric transformer power density Transmission method, for using A circuitry phase in the three-phase cascade connection type electric power electric transformer of sinusoidal power transmission method, exchange side electricity Stream and voltage are all that power frequency sine wave is respectively
Its power Pa(t)=VmIm sin2ω0T is twice of fundamental frequency fluctuation, and power swing transmittance process such as (1) is shown, A phase power swing is flowed by AC-DC converter to DC side, when being transmitted to intermediate dc side, is transmitted according to sinusoidal power Method, reduce the intermediate dc lateral capacitance C of A circuitry phase2Capacitance, intermediate dc lateral capacitance do not need to undertake from alternating current The power swing that net A phase passes over, therefore the P in intermediate dc lateral capacitanceripaFluctuation amplitude very little；Since DC-DC is converted Device has power delivery capabilities, and power swing will continue to be transmitted to low-voltage direct side by DC-DC converter, low-voltage direct side Power swing is Pdca。
For using B circuitry phase in the three-phase cascade connection type electric power electric transformer of sinusoidal power transmission method, exchange side electricity Stream and voltage are all that power frequency sine wave is respectively
Its power Pb(t)=VmIm sin2(ω0T-120 °) it is twice of fundamental frequency fluctuation, power swing transmittance process is such as (2) shown in, B phase power swing by AC-DC converter to direct current effluent when, when being transmitted to intermediate dc side, according to sine The method of power transmission reduces the intermediate dc lateral capacitance C of B circuitry phase2Capacitance, intermediate dc lateral capacitance do not need to undertake The power swing passed over from AC network B phase, therefore the P in intermediate dc lateral capacitanceripbFluctuation amplitude very little；Due to DC-DC converter has power delivery capabilities, and power swing will continue to be transmitted to low-voltage direct side by DC-DC converter, low The power swing for pressing DC side is Pdcb。
For using C circuitry phase in the three-phase cascade connection type electric power electric transformer of sinusoidal power transmission method, exchange side electricity Stream and voltage are all that power frequency sine wave is respectively
Its power Pc(t)=VmIm sin2(ω0T+120 °) it is twice of fundamental frequency fluctuation, power swing transmittance process is such as (3) shown in, C phase power swing is flowed by AC-DC converter to DC side, when being transmitted to intermediate dc side, according to sine The method of power transmission reduces the intermediate dc lateral capacitance C of C circuitry phase2Capacitance, intermediate dc lateral capacitance do not need to undertake The power swing passed over from AC network C phase, therefore the P of intermediate dc sideripcFluctuation amplitude very little；Since DC-DC becomes Parallel operation has power delivery capabilities, and power swing will continue to be transmitted to low-voltage direct side by DC-DC converter, low-voltage direct side Power swing be Pdcc。
Since exchange side three-phase current and voltage are all power frequency sine waves, three phase power is respectively
Three phase power fluctuation is twice of fundamental frequency fluctuation and three-phase symmetrical, according to sinusoidal power transmission method, three-phase function Rate fluctuation is transmitted to low pressure public direct-current side respectively, and three phase power fluctuation is shown in common low pressure DC side such as (4), due to three-phase Cascade connection type electric power electric transformer intermediate dc lateral capacitance does not undertake three phase power fluctuation and DC-DC converter has power transmission Ability, therefore, the three phase power of low-voltage direct side fluctuate Pdca, PdcbAnd PdccIt is similarly twice of fundamental frequency fluctuation and three is opposite Claim, theoretical according to three-phase symmetrical system power, the power swing of three-phase symmetrical system is zero, therefore public direct-current side power Pdc (t)=Pdca+Pdcb+PdccThe fluctuation of very little will be had.
The AC-DC converter 1 is based on cascade submodule building, and submodule specific structure is bridge-type, such as Fig. 3 institute Show.
The controlled resonant converter 3 is based on submodule building in parallel, and submodule specific structure is with power delivery capabilities Controlled resonant converter, as shown in Figure 4.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art For member, without departing from the principle of the present invention, it can also make several improvements and retouch, these improvements and modifications are also answered It is considered as protection scope of the present invention.

Claims (8)

1.一种提高电力电子变压器功率密度的正弦功率传输方法，其特征在于，分别通过电力电子变压器的三相电路传递到公共低压直流侧(4)，所述正弦功率传输方法包括A相功率波动传递(1)、B相功率波动传递(2)和C相功率波动传递(3)，所述电力电子变压器由基于级联的AC-DC变换器(1)、中间直流电容(2)及DC-DC变换器(3)按照三相系统结构结合构成，AC-DC变换器(1)交流侧接入高压交流母线，直流侧串联接入中间直流侧电容C2(2)；中间直流侧电容C2(2)两端分别与AC-DC变换器(1)和DC-DC变换器(3)连接；DC-DC变换器(3)包括DC-AC变换器、高频变压器和AC-DC变换器，DC-AC变换器直流侧与中间直流侧电容C2(2)串联；高频变压器一侧与DC-AC变换器的交流侧相连，另一侧与AC-DC变换器的交流相连；AC-DC变换器交流侧与高频变压器相连，直流侧与低压直流母线连接，A相、B相与C相结构相同，三相电路都在低压直流母线侧并联连接，三相功率波动为两倍基频频率波动且三相对称，由于中间直流侧电容不承担三相功率波动，低压直流侧的三相功率波动Pdca，Pdcb和Pdcc同样为两倍基频频率波动且三相对称。1. a sinusoidal power transmission method for improving the power density of a power electronic transformer, characterized in that, the three-phase circuit of the power electronic transformer is respectively transferred to the public low-voltage DC side (4), and the sinusoidal power transmission method comprises A-phase power fluctuations Transmission (1), B-phase power fluctuation transmission (2) and C-phase power fluctuation transmission (3), the power electronic transformer is composed of a cascade-based AC-DC converter (1), an intermediate DC capacitor (2) and a DC - The DC converter (3) is formed according to the combination of the three-phase system structure, the AC-DC converter (1) is connected to the high-voltage AC bus on the AC side, and the DC side is connected to the intermediate DC side capacitor C 2 (2) in series; the intermediate DC side capacitor Both ends of C 2 (2) are respectively connected with an AC-DC converter (1) and a DC-DC converter (3); the DC-DC converter (3) includes a DC-AC converter, a high-frequency transformer and an AC-DC converter Converter, the DC side of the DC-AC converter is connected in series with the intermediate DC side capacitor C 2 (2); one side of the high-frequency transformer is connected to the AC side of the DC-AC converter, and the other side is connected to the AC side of the AC-DC converter. ; The AC side of the AC-DC converter is connected to the high-frequency transformer, the DC side is connected to the low-voltage DC bus, the A-phase, B-phase and C-phase have the same structure, and the three-phase circuits are connected in parallel on the low-voltage DC bus side, and the three-phase power fluctuation is Twice the fundamental frequency frequency fluctuation and three-phase symmetry, because the intermediate DC side capacitor does not bear the three-phase power fluctuation, the three-phase power fluctuations P dca , P dcb and P dcc of the low-voltage DC side are also twice the fundamental frequency frequency fluctuation and the three-phase power fluctuation symmetry. 2.如权利要求1所述的一种提高电力电子变压器功率密度的正弦功率传输方法，其特征在于，A相功率波动传递(1)交流侧电流和电压均为工频正弦波，分别为iac＝Imsinω0t和vac＝Vmsinω0t；其功率Pa(t)＝VmImsin2ω0t为两倍基频频率波动，低压直流侧的功率波动为Pdca。2. a kind of sinusoidal power transmission method improving the power density of power electronic transformer as claimed in claim 1, it is characterized in that, A-phase power fluctuation transmits (1) AC side current and voltage are power frequency sine waves, respectively i ac =I m sinω 0 t and v ac =V m sinω 0 t; its power P a (t)=V m I m sin 2 ω 0 t is twice the fundamental frequency fluctuation, and the power fluctuation of the low-voltage DC side is P dca . 3.如权利要求1所述的一种提高电力电子变压器功率密度的正弦功率传输方法，其特征在于，B相功率波动传递(2)交流侧电流和电压均为工频正弦波，分别为iac＝Imsin(ω0t-120°)和vac＝Vmsin(ω0t-120°)；其功率Pb(t)＝VmImsin2(ω0t-120°)为两倍基频频率波动，B相功率波动通过AC-DC变换器向低压公共直流侧(4)流动，低压直流侧的功率波动为Pdcb。3. a kind of sinusoidal power transmission method improving power density of power electronic transformer as claimed in claim 1, is characterized in that, B-phase power fluctuation transmits (2) alternating current side current and voltage are power frequency sine waves, respectively i ac =I m sin(ω 0 t-120°) and v ac =V m sin(ω 0 t-120°); its power P b (t)=V m I m sin 2 (ω 0 t-120° ) is twice the fundamental frequency fluctuation, the B-phase power fluctuation flows to the low-voltage common DC side (4) through the AC-DC converter, and the power fluctuation of the low-voltage DC side is P dcb . 4.如权利要求1所述的一种提高电力电子变压器功率密度的正弦功率传输方法，其特征在于，所述C相功率波动传递(3)交流侧电流和电压均为工频正弦波，分别为iac＝Imsin(ω0t+120°)和vac＝Vmsin(ω0t+120°)；其功率Pc(t)＝VmImsin2(ω0t+120°)为两倍基频频率波动，C相功率波动通过AC-DC变换器向低压公共直流侧(4)流动，低压直流侧的功率波动为Pdcc。4. a kind of sinusoidal power transmission method improving the power density of power electronic transformer as claimed in claim 1 is characterized in that, described C-phase power fluctuation transmits (3) AC side current and voltage are power frequency sine waves, respectively are i ac =I m sin(ω 0 t+120°) and v ac =V m sin(ω 0 t+120°); its power P c (t)=V m I m sin 2 (ω 0 t+ 120°) is twice the fundamental frequency fluctuation, the C-phase power fluctuation flows to the low-voltage common DC side (4) through the AC-DC converter, and the power fluctuation of the low-voltage DC side is P dcc . 5.如权利要求1所述的一种提高电力电子变压器功率密度的正弦功率传输方法，其特征在于，所述AC-DC变换器(1)基于级联子模块构建，级联子模块包括全桥型VSC变换器。5. The sinusoidal power transmission method for improving the power density of a power electronic transformer according to claim 1, wherein the AC-DC converter (1) is constructed based on cascaded sub-modules, and the cascaded sub-modules comprise a full range of Bridge VSC converter. 6.如权利要求1所述的一种提高电力电子变压器功率密度的正弦功率传输方法，其特征在于，所述中间直流电容C2(2)由三相小容值的电容器构成。6 . The sinusoidal power transmission method for improving the power density of a power electronic transformer according to claim 1 , wherein the intermediate DC capacitor C 2 (2) is composed of three-phase small-capacity capacitors. 7 . 7.如权利要求1所述的一种提高电力电子变压器功率密度的正弦功率传输方法，其特征在于，所述DC-DC变换器(3)基于并联子模块构建，级联子模块包括谐振变换器。7. A sinusoidal power transmission method for improving the power density of a power electronic transformer as claimed in claim 1, wherein the DC-DC converter (3) is constructed based on a parallel sub-module, and the cascaded sub-module comprises a resonant transformation device. 8.如权利要求1所述的一种提高电力电子变压器功率密度的正弦功率传输方法，其特征在于，所述AC-DC变换器(1)和DC-DC变换器(3)具有功率传递性。8. A sinusoidal power transmission method for improving the power density of a power electronic transformer according to claim 1, wherein the AC-DC converter (1) and the DC-DC converter (3) have power transferability .
CN201610392644.9A 2016-05-26 2016-05-26 A kind of sinusoidal power transmission method improving electric power electric transformer power density Expired - Fee Related CN105978370B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201610392644.9A CN105978370B (en) 2016-05-26 2016-05-26 A kind of sinusoidal power transmission method improving electric power electric transformer power density

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201610392644.9A CN105978370B (en) 2016-05-26 2016-05-26 A kind of sinusoidal power transmission method improving electric power electric transformer power density

Publications (2)

Publication Number Publication Date
CN105978370A CN105978370A (en) 2016-09-28
CN105978370B true CN105978370B (en) 2019-04-05

Family

ID=57010813

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201610392644.9A Expired - Fee Related CN105978370B (en) 2016-05-26 2016-05-26 A kind of sinusoidal power transmission method improving electric power electric transformer power density

Country Status (1)

Country Link
CN (1) CN105978370B (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108169571B (en) 2016-12-07 2020-06-02 台达电子企业管理（上海）有限公司 Method and device for monitoring capacitance value of direct current bus capacitor
CN106877314B (en) * 2017-03-10 2023-11-21 山东大学 A multi-power electronic transformer traction power supply system with a common DC bus on the low-voltage side
CN106956598A (en) * 2017-04-11 2017-07-18 山东大学 A kind of electric power electric transformer tractive power supply system for improving power density
CN110365213B (en) * 2018-04-11 2021-06-18 南京南瑞继保电气有限公司 Bidirectional direct current converter comprising two types of modules and control method thereof
CN112260543B (en) * 2020-09-19 2022-06-24 许继电源有限公司 A high-gain high-frequency isolation bidirectional cascaded DC/DC converter and its control method
CN112103938B (en) * 2020-10-10 2022-06-28 北京百度网讯科技有限公司 Power supply architecture, method and system based on HVDC equipment

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101860228A (en) * 2010-05-07 2010-10-13 中国科学院电工研究所 Power Electronic Transformers for High Voltage Distribution
CN103248210A (en) * 2013-04-23 2013-08-14 西安交通大学 Power synchronous control method for reducing secondary fluctuations of direct current side voltage
CN104836456A (en) * 2015-05-26 2015-08-12 苏州优电电气技术有限公司 Power electron transformer topology composition based on cascade multilevel
CN105450038A (en) * 2015-12-29 2016-03-30 中国电力科学研究院 Modular H bridge cascade multi-level power electronic transformer control system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101860228A (en) * 2010-05-07 2010-10-13 中国科学院电工研究所 Power Electronic Transformers for High Voltage Distribution
CN103248210A (en) * 2013-04-23 2013-08-14 西安交通大学 Power synchronous control method for reducing secondary fluctuations of direct current side voltage
CN104836456A (en) * 2015-05-26 2015-08-12 苏州优电电气技术有限公司 Power electron transformer topology composition based on cascade multilevel
CN105450038A (en) * 2015-12-29 2016-03-30 中国电力科学研究院 Modular H bridge cascade multi-level power electronic transformer control system

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
An AC/DC Power Conversion Based on Series-connected Universal Link Converter;Anno Yoo等;《Energy Conversion Congress and Exposition (ECCE), 2010 IEEE》;20100916;第2913-2920页
Dual Active Bridge-Based Battery Charger for Plug-in Hybrid Electric Vehicle With Charging Current Containing Low Frequency Ripple;Lingxiao Xue等;《IEEE TRANSACTIONS ON POWER ELECTRONICS》;20151231;第30卷(第12期);第7299-7307页

Also Published As

Publication number Publication date
CN105978370A (en) 2016-09-28

Similar Documents

Publication Publication Date Title
CN105978370B (en) A kind of sinusoidal power transmission method improving electric power electric transformer power density
CN104022675B (en) Single-stage bidirectional isolation AC-DC converter
CN107017638A (en) A kind of many bus electric energy router topological structures of multiport suitable for power distribution network
CN101795072A (en) High-voltage direct-current direct-current (HVDC-DC) power electronic converter transformer
CN109586597A (en) It is a kind of that power supply mould group is aoxidized based on phase shifting full bridge soft switch and the high frequency of synchronous rectification
CN101860228A (en) Power Electronic Transformers for High Voltage Distribution
CN102064712A (en) Power electronic transformer based on simple PFC (Power Factor Correction)
CN107171578B (en) Two Stages type AC-DC electric power electric transformer
CN107134926A (en) A Modular Power Router Combined Circuit
CN108092518B (en) Three-stage AC/DC hybrid three-port power electronic transformer
CN208353222U (en) A kind of Universal flexible Energy Management System based on Modular multilevel converter
CN104283436A (en) A Combined MMC DC Transformer Based on Transformer Coupling
CN104601003A (en) Power electronic transformer based on modular multilevel converter
CN109980948A (en) A kind of five port electric power electric transformer of three Coupling Between Phases
CN108649806A (en) A kind of electron electric power phase-shifting transformer for multi phase rectifier
CN205051584U (en) Three -phase - single -phase potential device of no frequency transformer
CN204392098U (en) A kind of Monophase electric power electronic transformer and application system thereof
CN112910272B (en) An isolation transformer
CN106100361A (en) A kind of ac-dc conversion circuit and electric power electric transformer
CN106452096B (en) A bridge structure, commutation circuit and power electronic transformer
CN207354062U (en) A kind of electronic potential device
CN105846685A (en) Cascaded voltage step-up type unidirectional direct current voltage transformer
CN206775393U (en) A kind of LLC resonant converter
CN106849671A (en) Matching direct-current grid triple channel alternating current-direct current isolated form full-bridge converter
CN208461698U (en) Commutator transformer topological structure

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20190405

Termination date: 20200526