CN104638940A - Modular multi-level power electronic transformer based on cascading - Google Patents
Modular multi-level power electronic transformer based on cascading Download PDFInfo
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- CN104638940A CN104638940A CN201510093843.5A CN201510093843A CN104638940A CN 104638940 A CN104638940 A CN 104638940A CN 201510093843 A CN201510093843 A CN 201510093843A CN 104638940 A CN104638940 A CN 104638940A
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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
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M5/4585—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only having a rectifier with controlled elements
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—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 with automatic control of the output voltage or current, e.g. flyback converters
Abstract
The invention provides a modular multi-level power electronic transformer based on cascading. The modular multi-level power electronic transformer structurally comprises a high-voltage MMC (modular multi-level commutator), a DC-DC (direct current-direct current) transformer and a lower-voltage inverter, wherein three-phase alternating current high voltage at the high-voltage side is connected with the MCC, and is rectified to obtain high-voltage direct current, the high-voltage direct current is treated by a plurality of small modular multi-level DC-DC conversion devices to obtain a low-voltage direct current bus, the low-voltage direct current bus is connected with the low-voltage inverter, and power frequency voltage is outputted; the MCC consists of three phases, and each phase consists of a plurality of modules; the high-voltage side of the DC-DC transformer is subject to voltage division by a plurality of capacitors in parallel, the DC-DC transformer is connected with a medium-frequency transformer through the MCC, then is connected with a rectifying device to obtain low-voltage direct current, and a plurality of direct current output ends are connected in parallel; the low-voltage direct current bus is connected with a bridge type inverter, so as to obtain power frequency electricity. The power electronic transformer has the advantages that the capacitance voltage fluctuating at the high-voltage side is small, the control is flexible, and the reliability is high.
Description
Technical field
The present invention relates to power electronic device and field transformer, be specifically related to a kind of electric power electric transformer based on modular multilevel.
Background technology
Electronic power transformer (Electronic Power Transformer, EPT) be otherwise known as electric power electric transformer (Power Electronic Transformer, or solid-state transformer (Solid State Transformer PET), SST), it a kind ofly to combine by Technics of Power Electronic Conversion technology with based on the transformation of electrical energy technology of electromagnetic induction principle, realizes the Novel intelligent transformer of the electric energy by a kind of converting electric energy of electrical nature being another kind of electrical nature.For traditional transformer, electric power electric transformer tool has the following advantages: (1) volume is little, lightweight, and environmental pollution is little; (2) when running, secondary side output voltage amplitude is constant, not with load variations, and smoothly adjustable; (3) once, secondary side voltage is sinusoidal waveform, and power factor is adjustable; (4) once, secondary side voltage, electric current and power are all highly controlled; (5) itself there is the function of circuit breaker, without the need to traditional transformer relay protecting device.Electric power electric transformer is the electric power system Some Questions To Be Researched integrating the fields such as power electronics, electric power system, computer, Digital Signal Processing and Theory of Automatic Control, also be solve power quality problem, one of feasible way of construction " green network ", " digital electric network ".At present at home and abroad, a lot of relevant research and development is had about electric power electric transformer.
Modular multilevel converter (Modular Multilevel Converter, MMC) is a kind of new converter being applicable to mesohigh application scenario.This structure has very large advantage, and compared with diode clamp type main at present, striding capacitance type many level topology, MMC has the features such as loss is little, redundancy good, switching frequency is low, output harmonic wave is few.Compared with cascaded H-bridges many level topology, MMC has the feature such as public direct-flow bus wire and good four-quadrant operation performance.Each sub modular structure of MMC is relatively simple, controls easily, can infinite expanding, is specially adapted to high-voltage large-capacity field.MMC is replaced cascaded H-bridges and obtain high voltage dc bus as the high-pressure side converter of PET.Middle DC-DC converter then realizes high-pressure side and low-pressure side isolation features.This PET based on MMC has following characteristics and advantages: 1) be three-phase structure, can improve VD quality.2) consumption of high frequency transformer can significantly be reduced.3) consumption of electronic power switch device can be reduced.
Summary of the invention
Goal of the invention: in order to overcome the deficiencies in the prior art, the invention provides the voltage fluctuation of a kind of high voltage direct current lateral capacitance little, controls flexibly, the electric power electric transformer based on the many level of cascade moduleization of good reliability.
For achieving the above object, the technical solution used in the present invention is: a kind of electric power electric transformer based on the many level of cascade moduleization, comprises modular multilevel rectifier MMC, DC/DC transformer unit of the high voltage direct current side connected successively by circuit and the low pressure inverter of low-voltage direct side; The AC of described modular multilevel rectifier connects three-phase high-voltage AC network, and described modular multilevel rectifier MMC is connected by high voltage dc bus with DC/DC transformer unit, and described low pressure inverter and DC/DC transformer unit are connected by low-voltage direct bus; Described modular multilevel rectifier MMC is by three phase compositions, and be often made up of upper and lower two brachium pontis, each brachium pontis is in series by multiple SM submodule; The mid point being often connected to every phase upper and lower bridge arm of three-phase high-voltage AC network, three-phase brachium pontis is connected in parallel on high-voltage direct current power grid positive and negative end; Described DC/DC transformer unit comprises more than one modular multilevel inverter, more than one intermediate frequency transformer and more than one first rectifier, and described modular multilevel inverter, intermediate frequency transformer and the first rectifier one_to_one corresponding, and the former limit of each intermediate frequency transformer is all connected to the AC of corresponding modular multilevel inverter, and the secondary of described intermediate frequency transformer is connected to the AC of the first corresponding rectifier; And be connected with high voltage dc bus by the first electric capacity is parallel with one another between the DC side of adjacent modular multilevel inverter, the DC side of the first rectifier is parallel with one another to be connected with low-voltage direct bus together. together
Preferred: the modular multilevel inverter of described DC/DC transformer unit is phase structure or double structure: in phase structure, the DC side of modular multilevel inverter is made up of two the second Capacitance parallel connections, the output of phase connects one end of intermediate frequency transformer, the mid point of another termination two series capacitance; In double structure, the DC side of modular multilevel inverter is made up of second electric capacity, one end of the output termination intermediate frequency transformer of every phase.
Preferred: described first rectifier can adopt diode uncontrollable rectifier circuit, or adopt all controlled rectifier circuit.
Preferred: described SM submodule comprises half-bridge circuit and the 3rd electric capacity, and described half-bridge circuit is together with the 3rd Capacitance parallel connection.
Preferred: described half-bridge structure is made up of two groups of insulated gate bipolar thyristors and fly-wheel diode, fly-wheel diode inverse parallel is at insulated gate bipolar thyristor two ends; And two groups of half-bridge structure composition all controlled rectifier circuits.
A kind of electric power electric transformer based on the many level of cascade moduleization provided by the invention, compared to existing technology, has following beneficial effect:
1. high-pressure side rectification circuit is made up of modular multilevel rectification circuit, adopts three-phase three bridge arm structure, and three-phase high-voltage is the many level of connection mode blocking respectively, and parallel three phase is in high voltage direct current side.Therefore adopt topological structure of the present invention can reach high voltage, Large Copacity by the expansion of submodule, reduce harmonic wave, improve the quality of power supply.
2. in DC/DC transformer described in, intermediate frequency transformer is lightweight, and volume is little, and make whole transformer lightweight, volume is little.During described first rectifier employing all controlled rectifier circuit, this electric power electric transformer can realize the two-way flow of trend, can realize the rapid combination of new forms of energy.
3. described in, DC/DC transformer output is parallel to low-voltage direct bus, after connect low pressure inverter circuit, the output of inverter circuit connects low-voltage alternating-current electrical network, described structure be new forms of energy provide abundant interface.
4. the modular multilevel rectifier structure described in replaces two traditional level, three-level structure as the interface of ac high-voltage electrical network, reduces harmonic wave, simultaneously can four quadrant running, realizes to and fro flow of power, controls simple, strong robustness.
5. described in, the modular multilevel inverter electric capacity of DC/DC transformer unit is single capacitor or two capacitance structure, is easy to the balance realizing high voltage direct current lateral capacitance voltage.
In sum: it is little that the electric power electric transformer that the present invention is based on the many level of cascade moduleization has the voltage fluctuation of high voltage direct current lateral capacitance, control flexibly, the feature of good reliability.
Accompanying drawing explanation
Fig. 1 is the electric power electric transformer system catenation principle block diagram based on the many level of cascade moduleization of the present invention.
Fig. 2 is prime high-voltage rectifier schematic diagram of the present invention.
Fig. 3 is the structure chart of Modularized multi-level converter sub-module of the present invention.
Fig. 4 is the schematic diagram of the first model of intergrade DC/DC transformer of the present invention.
Fig. 5 is the schematic diagram of the second model of intergrade DC/DC transformer of the present invention.
Fig. 6 is the schematic diagram that the first rectifier of intergrade DC/DC transformer of the present invention can adopt uncontrollable rectifier.
Fig. 7 is the schematic diagram that the first rectifier of intergrade DC/DC transformer of the present invention can adopt full-controlled rectifier.
Fig. 8 is rear class inversion grid connection electric current principle figure of the present invention.
Fig. 9 is the overall electric power electric transformer schematic diagram that intergrade of the present invention adopts the first model (Fig. 4).
Figure 10 is the overall electric power electric transformer schematic diagram that intergrade of the present invention adopts second model (Fig. 5).
Embodiment
Below in conjunction with accompanying drawing, the present invention is further described.
Based on an electric power electric transformer for the many level of cascade moduleization, as shown in Figure 1, modular multilevel rectifier MMC, DC/DC transformer unit of the high voltage direct current side connected successively by circuit and the low pressure inverter of low-voltage direct side is comprised; The AC of described modular multilevel rectifier connects three-phase high-voltage AC network, and described modular multilevel rectifier MMC is connected by high voltage dc bus with DC/DC transformer unit, and described low pressure inverter is connected by low-voltage direct bus with DC/DC transformer unit.
As shown in Figure 2, described modular multilevel rectifier MMC, by three phase compositions, is often made up of upper and lower two brachium pontis, each brachium pontis is in series by multiple SM submodule, comprises circuit and connects more than one submodule SM successively, as shown in Figure 2, described submodule SM is SM1, SM2, SM3, SMn, high voltage direct current positive pole connects the first inductance, the second inductance, more than one submodule SM connects high voltage negative, and parallel three phase is at High-voltage AC Network positive and negative end.
As shown in Figure 1, described DC/DC transformer unit comprises more than one modular multilevel inverter FB, more than one intermediate frequency transformer and more than one first rectifier mmc, and described modular multilevel inverter FB, intermediate frequency transformer and the first rectifier mmc one_to_one corresponding, and the former side of each intermediate frequency transformer is all connected to the AC of corresponding modular multilevel inverter FB, and the pair side of described intermediate frequency transformer is connected to the AC of the first corresponding rectifier mmc; And be connected with high voltage dc bus by the first electric capacity is parallel with one another between the DC side of adjacent modular multilevel inverter FB, the DC side parallel of the first rectifier mmc is connected with low-voltage direct bus. together
The modular multilevel inverter FB of described DC/DC transformer unit is divided into phase structure or double structure: as shown in Figure 4, in phase structure, the DC side of modular multilevel inverter FB is made up of two the second capacitances in series, a DC side two ends phase module structure in parallel, the output of phase connects one end of intermediate frequency transformer, the mid point of another termination two series capacitance; As shown in Figure 5, in double structure, the DC side of modular multilevel inverter FB is made up of second electric capacity, DC side two ends two-phase modular construction in parallel, one end of the output termination intermediate frequency transformer of every phase.
As shown in Figure 6, described first rectifier can adopt diode uncontrollable rectifier circuit, or adopts all controlled rectifier circuit as shown in Figure 7.
As shown in Figure 3, described SM submodule comprises half-bridge circuit and the 3rd electric capacity, and described half-bridge circuit is together with the 3rd Capacitance parallel connection.
Described half-bridge structure is made up of two groups of insulated gate bipolar thyristors and fly-wheel diode, one group is made up of insulated gate bipolar thyristor S1, S2 and sustained diode 1, D2, and the inverse parallel of sustained diode 1, D2 difference is at insulated gate bipolar thyristor S1, S2 two ends corresponding separately; Another group is made up of insulated gate bipolar thyristor S3, S4 and sustained diode 3, D4, and the inverse parallel of sustained diode 3, D4 difference is at insulated gate bipolar thyristor S3, S4 two ends corresponding separately; And two groups of half-bridge structure composition full bridge rectifiers.
Example
Modular multilevel electric power electric transformer of the present invention is made up of on high-tension side MMC rectification circuit (Fig. 2), DC/DC transformer (Fig. 4 or Fig. 5), low-voltage direct side inverter circuit (Fig. 8); 3 partial circuits connect successively, constitute the basic structure of modular multilevel electric power electric transformer.The AC of described modular multilevel rectifier connects three-phase high-voltage AC network, and the DC side of described modular multilevel rectifier connects DC/DC transformer.Described modular multilevel rectifier has three phase compositions, and be often made up of upper and lower two brachium pontis, each brachium pontis has multiple submodule to be in series, parallel three phase and high voltage direct current side positive and negative end.Described DC/DC transformer input side is made up of modular multilevel inverter, and export and obtain low pressure by rectification circuit, low-voltage direct, through low pressure inverter circuit, obtains low-voltage alternating-current.Low-voltage alternating-current bus is directly connected with power distribution network or load, electric energy transmitting.
Modular multilevel electric power electric transformer overall structure of the present invention as shown in Figure 1, is made up of rectifier (MMC converter) MMC, DC/DC converter and low pressure inverter DC/AC.The modular multilevel inverter FB of described DC/DC transformer unit, intermediate frequency transformer and rectifier mmc are made up of multiple, the AC of former side's connection mode blocking multi-electrical level inverter of described intermediate frequency transformer, described intermediate frequency transformer pair side connects the AC of rectifier mmc, described rectifier mmc DC side is multiple parallel connection, is connected to low-voltage direct bus simultaneously.In low-pressure side, there are the low-voltage direct bus and low-voltage alternating-current bus that can conveniently access, facilitate the access of new forms of energy and the grid-connected of AC load.Direct-flow input end in described DC/DC transformer is composed in series by multiple modular multilevel inverter FB, and the output of each modular multilevel inverter FB is connected with the input of intermediate frequency transformer.
In described DC/DC transformer, intermediate frequency transformer is lightweight, and volume is little.In described DC/DC transformer low voltage rectification circuit, diode uncontrollable rectifier circuit can be adopted, or adopt controlled rectification circuit.When described rectification circuit adopts controlled rectification circuit, this electric power electric transformer can realize the two-way flow of trend, can realize the rapid combination of new forms of energy.
As shown in Figure 1, AC connects three phase network to high-pressure side modular multilevel rectification circuit, and be often made up of upper and lower bridge arm, each brachium pontis has N number of submodule.High-pressure side rectification circuit adopts the control strategy of power outer shroud, current inner loop, and modulation strategy then adopts phase-shifting carrier wave.High-pressure side rectification circuit is made up of modular multilevel rectification circuit, adopts three-phase three bridge arm structure, and three-phase high-voltage is connection mode blocking many level, parallel three phase and high voltage direct current side respectively.Described topology can reach high voltage, Large Copacity by the expansion of submodule, reduces harmonic wave, improves the quality of power supply.
Described DC/DC transformer output is parallel to DC bus, after connect full bridge inverter, the output of inverter circuit connects low-voltage alternating-current electrical network, described structure be new forms of energy provide abundant interface.
DC/DC transformer unit in modular multilevel electric power electric transformer of the present invention, it is made up of multiple modular multilevel junior unit.Described submodule is made up of half-bridge circuit and electric capacity, described half-bridge circuit and described Capacitance parallel connection.In described DC/DC transformer, the modular multilevel inverter of direct-flow input end has single-phase and double structure: as Fig. 4 and Fig. 5, two kinds of structures.Fig. 4 is single-phase pair of capacitance structure, and in phase structure, the DC side of inverter mmc is made up of two capacitances in series, and the output of phase connects one end of intermediate frequency transformer FB, the mid point of another termination two series capacitance.Namely the first electric capacity and the second capacitances in series and and parallel single-phase, be often connected and comprise multiple submodule from top to bottom, the first inductance, the second inductance, multiple submodule.Draw tap between first electric capacity and the second electric capacity and connect intermediate frequency transformer one end, draw between the first inductance of phase and the second inductance and be connected to the intermediate frequency transformer other end.Fig. 5 is two-phase single capacitor structure, and the DC side of inverter mmc is made up of an electric capacity, and electric capacity two ends two-phase in parallel, the output of every phase connects one end of intermediate frequency transformer respectively.Namely electric capacity two ends are in parallel with two respectively, and in parallel connection from top to bottom mutually comprises multiple submodule, the first inductance, the second inductance, multiple submodule composition.Draw respectively between first inductance of every phase and the second inductance and be connected to intermediate frequency transformer FB one end.Add intermediate frequency transformer and a first rectifier junior unit as DC/DC transformer by modular multilevel inverter, this junior unit is in the series connection of high voltage direct current side, and the inversion after intermediate frequency transformer exports on low-voltage bus bar in parallel.
As shown in Fig. 4 or Fig. 5, the output of intermediate frequency transformer FB connects rectifying device.The full-controlled rectifier (controlled rectification) that Fig. 7 can be adopted to adopt, or the uncontrollable rectifier shown in Fig. 6.Controlled rectification is composed in parallel by two groups of half-bridges, and often organize half-bridge and be in series by upper and lower two IGBT, each IGBT and diode inverse parallel are formed.Uncontrollable rectifier shown in Fig. 6 is composed in parallel by two groups of half-bridges, often organizes half-bridge and is made up of upper and lower two Diode series.
Described half-bridge structure is made up of two groups of insulated gate bipolar thyristor S1 and sustained diode 1, and sustained diode 1 inverse parallel is at insulated gate bipolar thyristor S1 two ends.Described full bridge structure is made up of two groups of half-bridge structures.
As shown in Figure 8, adopt low pressure inverter circuit, the output of this structure is directly incorporated into power distribution network or connects AC load modular multilevel electric power electric transformer mesolow inverter circuit of the present invention.
As shown in Figure 9 and Figure 10, wherein part B also has structure as shown in Figure 6 to the overall structure figure of modular multilevel electric power electric transformer of the present invention.The present invention proposes a kind of novel modular multilevel electric power electric transformer structure.The present invention connects little modular multilevel inverter in high voltage direct current rear flank, and this structure can effective balanced capacitance voltage, the control of the capacitance voltage of simplification.The input of intermediate frequency transformer proposes 2 kinds of structures, is single-phase pair of electric capacity and two-phase single capacitor structure respectively, and the output of intermediate frequency transformer adopts controlled rectification or uncontrollable rectifier two kinds.The DC bus of low-pressure side provides abundant new-energy grid-connected interface.
A kind of electric power electric transformer based on modular multilevel, this structure comprises modular multilevel rectifier MMC and DC/DC transformer, the AC of described modular multilevel rectifier MMC connects three-phase high-voltage AC network, and the DC side of described modular multilevel rectifier MMC connects DC/DC transformer.Described modular multilevel rectifier MMC has three phase compositions, and be often made up of upper and lower two brachium pontis, each brachium pontis has multiple submodule SM to be in series, parallel three phase and high voltage direct current side positive and negative end.Described DC/DC transformer input side is made up of modular multilevel inverter MMC, and export and obtain low-voltage direct by rectification circuit, low-voltage direct, through low pressure inverter circuit, obtains low-voltage alternating-current.Low-voltage alternating-current bus is directly connected with power distribution network or load, electric energy transmitting.
In instances, high-pressure side rectification circuit is made up of modular multilevel rectification circuit, adopts three-phase three bridge arm structure, and three-phase high-voltage is the many level of connection mode blocking respectively, and parallel three phase is in high voltage direct current side.Described topology can reach high voltage, Large Copacity by the expansion of submodule SM, reduces harmonic wave, improves the quality of power supply.
In instances, described DC/DC transformer also comprises modular multilevel inverter FB, intermediate frequency transformer and rectifier mmc, described modular multilevel inverter FB, intermediate frequency transformer and rectifier mmc are made up of multiple, the AC of the former limit connection mode blocking multi-electrical level inverter of described intermediate frequency transformer FB, described intermediate frequency transformer FB secondary connects the AC of rectifier mmc, described rectifier mmc DC side is multiple parallel connection, connects and low-voltage direct bus simultaneously.
In instances, the direct-flow input end in described DC/DC transformer is composed in series by multiple modular multilevel inverter mmc, and the output of each modular multilevel inverter mmc is connected with the input of intermediate frequency transformer FB.In described DC/DC transformer, the modular multilevel inverter of direct-flow input end has single-phase and double structure: in phase structure, the DC side of inverter is made up of two Capacitance parallel connections, the output of phase connects one end of intermediate frequency transformer, the mid point of another termination two series capacitance; In double structure, the DC side of inverter is made up of an electric capacity, one end of the output termination intermediate frequency transformer of every phase.This structure can realize the balance of high voltage direct current lateral capacitance voltage.
In instances, in described DC/DC transformer, intermediate frequency transformer is lightweight, and volume is little.In described DC/DC transformer low voltage rectification circuit, diode uncontrollable rectifier circuit can be adopted, or adopt controlled rectification circuit.When described rectification circuit adopts controlled rectification circuit, this electric power electric transformer can realize the two-way flow of trend, can realize the rapid combination of new forms of energy.
In instances, described DC/DC transformer output is parallel to DC bus, after connect full bridge inverter, the output of inverter circuit can connect low-voltage alternating-current electrical network or load, described structure be new forms of energy provide abundant interface.
In instances, described modular multilevel rectifier structure replaces two traditional level, three-level structure as the interface of ac high-voltage electrical network, reduces harmonic wave, simultaneously can four quadrant running, realizes to and fro flow of power, controls simple, strong robustness.
From the above, high-pressure side of the present invention, three-phase alternating current high pressure connection mode blocking multi-level rectifier, the high voltage bus voltage that rectification obtains obtains low-voltage direct bus by little modular multilevel DC-DC converting means, low-voltage direct bus connects low pressure inverter, exports power-frequency voltage.Wherein modular multilevel rectifier is by three phase compositions, every by multiple module composition.DC-DC transformer, high voltage direct current side by multiple Capacitance parallel connection dividing potential drop, and connects intermediate frequency transformer by modular multilevel convertor assembly, after connect rectifying device and obtain DC low-voltage, multiple output is in parallel.Low-voltage direct bus connects bridge-type inverter, obtains power frequency electric.This invention high voltage direct current lateral capacitance voltage fluctuation is little, controls flexibly, good reliability.
The above is only the preferred embodiment of the present invention; be noted that for those skilled in the art; under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (5)
1. based on an electric power electric transformer for the many level of cascade moduleization, it is characterized in that: comprise modular multilevel rectifier MMC, DC/DC transformer unit of the high voltage direct current side connected successively by circuit and the low pressure inverter of low-voltage direct side; The AC of described modular multilevel rectifier connects three-phase high-voltage AC network, and described modular multilevel rectifier MMC is connected by high voltage dc bus with DC/DC transformer unit, and described low pressure inverter and DC/DC transformer unit are connected by low-voltage direct bus; Described modular multilevel rectifier MMC is by three phase compositions, and be often made up of upper and lower two brachium pontis, each brachium pontis is in series by multiple SM submodule; The mid point being often connected to every phase upper and lower bridge arm of three-phase high-voltage AC network, three-phase brachium pontis is connected in parallel on high-voltage direct current power grid positive and negative end; Described DC/DC transformer unit comprises more than one modular multilevel inverter, more than one intermediate frequency transformer and more than one first rectifier, and described modular multilevel inverter, intermediate frequency transformer and the first rectifier one_to_one corresponding, and the former limit of each intermediate frequency transformer is all connected to the AC of corresponding modular multilevel inverter, and the secondary of described intermediate frequency transformer is connected to the AC of the first corresponding rectifier; And be connected with high voltage dc bus by the first electric capacity is parallel with one another between the DC side of adjacent modular multilevel inverter, the DC side of the first rectifier is parallel with one another to be connected with low-voltage direct bus together. together
2. the electric power electric transformer based on the many level of cascade moduleization according to claim 1, it is characterized in that: the modular multilevel inverter of described DC/DC transformer unit is phase structure or double structure: in phase structure, the DC side of modular multilevel inverter is made up of two the second capacitances in series, a DC side two ends phase module structure in parallel, the output of phase connects one end of intermediate frequency transformer, the mid point of another termination two series capacitance; In double structure, the DC side of modular multilevel inverter is made up of second electric capacity, DC side two ends two-phase modular construction in parallel, one end of the output termination intermediate frequency transformer of every phase.
3. the electric power electric transformer based on the many level of cascade moduleization according to claim 2, is characterized in that: described first rectifier can adopt diode uncontrollable rectifier circuit, or adopts all controlled rectifier circuit.
4. the electric power electric transformer based on the many level of cascade moduleization according to claim 3, is characterized in that: described SM submodule comprises half-bridge circuit and the 3rd electric capacity, and described half-bridge circuit is together with the 3rd Capacitance parallel connection.
5. the electric power electric transformer based on the many level of cascade moduleization according to claim 4, it is characterized in that: described half-bridge structure is made up of two groups of insulated gate bipolar thyristors and fly-wheel diode, fly-wheel diode inverse parallel is at insulated gate bipolar thyristor two ends; And two groups of half-bridge structure composition all controlled rectifier circuits.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105490552A (en) * | 2016-01-12 | 2016-04-13 | 中国电力科学研究院 | Modular multilevel converter (MMC) based solid-state transformer and control method thereof |
| CN105515401A (en) * | 2015-11-30 | 2016-04-20 | 武汉大学 | Solid state transformer in modularized multi-level structure |
| CN105553304A (en) * | 2016-01-15 | 2016-05-04 | 湖南大学 | Novel modular multi-level solid-state transformer and internal model control method thereof |
| CN106998145A (en) * | 2017-04-10 | 2017-08-01 | 东南大学 | Reversely DC converting unit is cascaded with circulation from the symmetric double of the ability of elimination |
| CN107104600A (en) * | 2016-02-23 | 2017-08-29 | 西门子公司 | Modular multilevel converter and electric power electric transformer |
| CN107134930A (en) * | 2017-06-30 | 2017-09-05 | 西安科技大学 | Power electronics distribution transformer and its control method based on MMC |
| WO2018109433A1 (en) * | 2016-12-13 | 2018-06-21 | Isotek Oil and Gas Limited | A subsea dc to dc voltage converter |
| CN108233402A (en) * | 2018-01-11 | 2018-06-29 | 上海交通大学 | Suitable for coal mine it is remote pressure DC transmission system |
| CN108551267A (en) * | 2018-06-25 | 2018-09-18 | 中国大唐集团科学技术研究院有限公司华中分公司 | The high voltage frequency converter of power cell composition |
| CN109728592A (en) * | 2019-02-28 | 2019-05-07 | 西南交通大学 | A kind of electric railway traction power supply system |
| CN112910291A (en) * | 2019-11-19 | 2021-06-04 | 北京金风科创风电设备有限公司 | Converter control method, controller and control equipment and converter system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105515401A (en) * | 2015-11-30 | 2016-04-20 | 武汉大学 | Solid state transformer in modularized multi-level structure |
| CN105490552B (en) * | 2016-01-12 | 2019-08-16 | 中国电力科学研究院 | A kind of solid-state transformer and control method based on MMC |
| CN105490552A (en) * | 2016-01-12 | 2016-04-13 | 中国电力科学研究院 | Modular multilevel converter (MMC) based solid-state transformer and control method thereof |
| CN105553304A (en) * | 2016-01-15 | 2016-05-04 | 湖南大学 | Novel modular multi-level solid-state transformer and internal model control method thereof |
| CN105553304B (en) * | 2016-01-15 | 2018-10-02 | 湖南大学 | A kind of modular multilevel type solid-state transformer and its internal model control method |
| CN107104600A (en) * | 2016-02-23 | 2017-08-29 | 西门子公司 | Modular multilevel converter and electric power electric transformer |
| US11038434B2 (en) | 2016-02-23 | 2021-06-15 | Siemens Aktiengesellschaft | Modular multilevel converter and power electronic transformer |
| WO2018109433A1 (en) * | 2016-12-13 | 2018-06-21 | Isotek Oil and Gas Limited | A subsea dc to dc voltage converter |
| CN106998145A (en) * | 2017-04-10 | 2017-08-01 | 东南大学 | Reversely DC converting unit is cascaded with circulation from the symmetric double of the ability of elimination |
| CN107134930A (en) * | 2017-06-30 | 2017-09-05 | 西安科技大学 | Power electronics distribution transformer and its control method based on MMC |
| CN108233402A (en) * | 2018-01-11 | 2018-06-29 | 上海交通大学 | Suitable for coal mine it is remote pressure DC transmission system |
| CN108551267A (en) * | 2018-06-25 | 2018-09-18 | 中国大唐集团科学技术研究院有限公司华中分公司 | The high voltage frequency converter of power cell composition |
| CN108551267B (en) * | 2018-06-25 | 2024-03-08 | 中国大唐集团科学技术研究院有限公司华中分公司 | High-voltage frequency conversion device composed of power units |
| CN109728592A (en) * | 2019-02-28 | 2019-05-07 | 西南交通大学 | A kind of electric railway traction power supply system |
| CN112910291A (en) * | 2019-11-19 | 2021-06-04 | 北京金风科创风电设备有限公司 | Converter control method, controller and control equipment and converter system |
| CN112910291B (en) * | 2019-11-19 | 2023-05-09 | 北京金风科创风电设备有限公司 | Control method, controller and control equipment of converter and converter system |
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