CN104485821A - Direct current transformer device used for power distribution - Google Patents

Direct current transformer device used for power distribution Download PDF

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Publication number
CN104485821A
CN104485821A CN201410658340.3A CN201410658340A CN104485821A CN 104485821 A CN104485821 A CN 104485821A CN 201410658340 A CN201410658340 A CN 201410658340A CN 104485821 A CN104485821 A CN 104485821A
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China
Prior art keywords
converter valve
pressure side
low
side converter
winding
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CN201410658340.3A
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Chinese (zh)
Inventor
王朝辉
张军明
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Zhejiang University ZJU
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Zhejiang University ZJU
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Priority to CN201410658340.3A priority Critical patent/CN104485821A/en
Publication of CN104485821A publication Critical patent/CN104485821A/en
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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
    • 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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/14—Arrangements for reducing ripples from dc input or output
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
    • H02M1/007—Plural converter units in cascade

Abstract

The invention relates to the technical field of power electronics converters, and aims to provide a direct current transformer device used for power distribution. The device comprises a high-frequency transformer, a high-voltage side converter valve and a low-voltage side converter valve, wherein the input side of the high-voltage side converter valve is directly connected with a middle-high-voltage direct current power grid, and the output side of the high-voltage side converter valve is connected with a primary side winding of the high-frequency transformer; the input side of the low-voltage side converter valve is connected with the primary side winding of the high-frequency transformer, and the output side of the low-voltage side converter valve is connected with a low-voltage direct current power grid or an energy storage system. The input sides and the output sides of the direct current transformer device are subjected to high-frequency isolation, a heavy low-frequency transformer is omitted, voltage can achieve a high level due to a modularization design, the cost is lowered, meanwhile, a redundancy design becomes simple and feasible, and the system can be repaired without outage; the switching loss of the device can be lowered by a phase shift control structure to enable the efficiency of the converter to be high; the energy of the direct current transformer system can carry out bidirectional flowing; the whole direct current transformer system has the advantages of simpleness and flexibility in control, efficiency and reliability.

Description

Distribution direct current transformation apparatus
Technical field
The present invention relates to DC distribution and electronic power convertor technical field, particularly one can realize high-frequency isolation, high voltage direct current input, low-voltage dc voltage output, realizes the distribution direct current transformation apparatus of energy in bidirectional flow simultaneously.
Background technology
Development of clean energy utilizes, and the regenerative resource being especially representative with wind energy and solar energy is applied, and has become countries in the world reply climate change, protection of the environment and has realized the Important Action of sustainable development.For adapting to this important development trend of renewable energy power generation, the micro-capacitance sensor technology in a distributed manner based on generating and intelligent power grid technology are developed rapidly.
Relative to interchange micro-capacitance sensor, the more convenient new forms of energy access of direct-current grid, also more easily realizes with the energetic interaction of energy-storage system simultaneously.In direct current network system, no matter new-energy grid-connected, or energy-storage system networking, current transformer only needs one-level to realize, thus saves inverter bulky in a large number or rectifier.In modern society, DC load proportion also rises day by day, such as illuminating LED, various portable type electronic product, television set, electric motor car etc.And Application of frequency conversion technique is in motor drives, can reduces the wastage, realize high efficiency using energy source.But at present, no matter be DC load driver, or frequency converter all need one-level ac-dc rectification to produce DC bus-bar voltage, then converts output dc voltage or dc-ac inversion drive motors by high frequency dc-dc.Direct-current grid directly for DC driver or frequency converter provide DC bus-bar voltage, can reduce the conversion grade of current transformer, realizes high efficiency using energy source.
But direct-current grid is because of its electric pressure lower (usually at about 400V), be only applicable to power supply in subrange.Be limited to current technology, direct-current grid still needs to be connected in middle pressure AC distribution net by inverter and Industrial Frequency Transformer, realizes the energetic interaction between different direct-current grid.But different direct-current grid is coupled by AC network, considerably increases the energy management of electric power system and control difficulty.Simultaneously there is the problems such as frequency stabilization, phase place, reactive power compensation, distribution radius are little in AC network.And DC distribution does not exist these problems, and power supply capacity is large, and line loss is little, and the quality of power supply is good, and distribution cost is low, and energy scheduling and manage comparatively AC distribution and easily realize, reliability also promotes further.But be limited to the development level of power electronic device, in still can effectively realizing without ripe scheme at present, straightening banishs the energetic interaction between electrical network and low-voltage direct micro-capacitance sensor, and realizes electrical isolation, thus limits development and the popularization of DC distribution.
Summary of the invention
The technical problem to be solved in the present invention is, overcomes deficiency of the prior art, provides a kind of distribution direct current transformation apparatus.Use the conversion that this device can realize between high voltage direct current and low-voltage direct, realize high efficiency energy transferring and Based Intelligent Control simultaneously.In addition this device can realize the continuous adjustment of output current, voltage, and converter system operation information is collected simple and convenient, can intercom mutually between multiple converter system, and Based Intelligent Control power grid energy flows.
In order to solve the problems of the technologies described above, solution of the present invention is:
A kind of distribution direct current transformation apparatus is provided, comprises power electronics converter valve and high frequency transformer; Described power electronics converter valve comprises high-pressure side converter valve and low-pressure side converter valve; Wherein, the input side of high-pressure side converter valve is directly connected with mesohigh direct current network, and its outlet side is connected with the former limit winding of high frequency transformer; The input side of low-pressure side converter valve is connected with the vice-side winding of high frequency transformer, and its outlet side is connected with low-voltage direct electrical network or energy-storage system; Wherein,
Described high-pressure side converter valve is made up of two change of current brachium pontis, and each change of current brachium pontis is made up of upper and lower two and half brachium pontis, and each half brachium pontis includes a brachium pontis inductance and n modular unit SM ij, i=1,2,3,4; J=1,2 ..., n; Form cascade structure between adjacent modular unit, mainly comprise in each modular unit and form half-bridge circuit or full-bridge circuit by switching device, or the circuit extended by aforementioned half-bridge circuit or full-bridge circuit, and a storage capacitor;
The connected mode of described high and low pressure side converter valve and high frequency transformer is any one in following structure:
(1) low-pressure side converter valve is connected with the vice-side winding of high frequency transformer, and low-pressure side converter valve adopts full-bridge circuit, half-bridge circuit or voltage-multiplying circuit; Or
(2) secondary of high frequency transformer has multiple winding, and each winding is all connected to the combination of a H bridge and electric capacity and exports separately separately, and low-pressure side converter valve has the same number of output with vice-side winding; Or
(3) secondary of high frequency transformer has multiple winding, and each winding is all connected to the combination of a H bridge and electric capacity and vice-side winding is connected successively, and low-pressure side converter valve has an output; Or
(4) have multiple high frequency transformer, and each former limit winding is connected successively, each vice-side winding is all connected to the combination of a H bridge and electric capacity and exports separately separately, and low-pressure side converter valve has the same number of output with vice-side winding; Or
(5) have multiple high frequency transformer, and each former limit winding is connected successively, each vice-side winding is all connected to the combination of a H bridge and electric capacity and its output is connected, and low-pressure side converter valve has an output; Or
(6) have multiple high frequency transformer, and each former limit winding is parallel with one another, each vice-side winding is all connected to the combination of a H bridge and electric capacity and exports separately separately, and low-pressure side converter valve has the same number of output with vice-side winding;
Central controller, module controller, control circuit are connected successively with drive circuit, and drive circuit is connected to the switching device in converter valve respectively, to realize switch control rule.
Invention further provides a kind of distribution direct current transformation apparatus, comprise power electronics converter valve and high frequency transformer; It is characterized in that, described power electronics converter valve comprises high-pressure side converter valve and low-pressure side converter valve; Wherein, the input side of high-pressure side converter valve is directly connected with mesohigh direct current network, and its outlet side is connected with the former limit winding of high frequency transformer; The input side of low-pressure side converter valve is connected with the vice-side winding of high frequency transformer, and its outlet side is connected with low-voltage direct electrical network; Wherein,
Described high-pressure side converter valve is made up of three change of current brachium pontis, and each change of current brachium pontis is made up of upper and lower two and half brachium pontis, and each half brachium pontis includes a brachium pontis inductance and n modular unit SM ij, i=1,2,3,4,5,6; J=1,2 ..., n; Form cascade structure between adjacent modular unit, each modular unit comprises and forms half-bridge circuit or full-bridge circuit by switching device, or the circuit extended by aforementioned half-bridge circuit or full-bridge circuit, and a storage capacitor; Described high frequency transformer is three-phase transformer; Comprise switching device in described low-pressure side converter valve, there are three bridge arm structures.
Improve as one, in the converter valve of described high-pressure side, two brachium pontis inductance in same change of current brachium pontis adopt coupled structure.
Improve as one, in the brachium pontis of described high-pressure side converter valve, each modular unit is equipped with by-pass switch.
Improve as one, described energy-storage system is lead-acid battery or lithium battery.
Compared with prior art, the invention has the beneficial effects as follows:
Described direct current transformation apparatus input and output side high-frequency isolation, the heavy low-frequency transformer of cancellation; Modular design makes voltage to accomplish higher level, and cost reduces, and Redundancy Design becomes simple possible simultaneously, and system does not need power-off to be keeped in repair; Phase shifting control structure can reduce the switching loss of device, makes current transformer efficiency higher; Commutator transformer system capacity can two-way flow; The utilization of coupling inductance significantly reduces bridge arm current ripple, makes current transformer impact less to direct current network; High-pressure side converter valve can pass through regulation output level number, realizes the conversion between high-low pressure; Whole commutator transformer Systematical control simple and flexible, high efficient and reliable etc.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
Fig. 1 is the distribution DC Transformer circuit schematic diagram based on single-phase transformer;
Fig. 2 is commutator transformer high-frequency inversion modular unit circuit diagram;
Fig. 3 is a kind of commutator transformer control waveform schematic diagram;
Fig. 4 is commutator transformer control block diagram.
Fig. 5 is the DC Transformer circuit schematic diagram that brachium pontis inductance utilizes coupling inductance;
Fig. 6 is the DC Transformer circuit schematic diagram that secondary adopts voltage-multiplying circuit;
Fig. 7 is the DC Transformer circuit schematic diagram of transformer secondary multiple-channel output;
Fig. 8 is the DC Transformer circuit schematic diagram that transformer secondary series connection single channel exports;
Fig. 9 is the DC Transformer circuit schematic diagram of multiple transformer primary side series connection secondary multiple-channel output;
Figure 10 is the DC Transformer circuit schematic diagram of multiple transformer primary side series connection secondary Parallel opertation;
Figure 11 is the DC Transformer circuit schematic diagram of multiple transformer primary side secondary multiple-channel output in parallel;
Figure 12 is the commutator transformer schematic diagram based on three-phase high frequency transformer;
Figure 13 is that brachium pontis adopts coupling inductance to realize the commutator transformer schematic diagram of the three brachium pontis changes of current;
Figure 14 is DC distribution DC Transformer circuit instance graph.
Embodiment
First it should be noted that, high pressure described in the present invention refers to and is greater than 100kV electric pressure, and mesohigh refers to the electric pressure between 10kV and 100kV, and low pressure refers to and is less than 1kV electric pressure, and high frequency refers to more than hundreds of hertz.In addition, high-pressure side is relatively low pressure side herein, not for specific electric pressure.For these concepts, under the specific applied environment of the present invention, those skilled in the art can know identification, can not exist and not understand or unclear problem.
The present invention proposes a kind of converter device realizing efficient interface between different electrical network in DC distribution net, comprise power electronics converter valve, high-frequency isolation transformer, control circuit and drive circuit.Electronic power conversion valve, is made up of high-pressure side converter valve and low-pressure side converter valve.High frequency transformer realizes voltage transformation and electrical isolation, and relative Industrial Frequency Transformer volume significantly reduces.Control circuit input/output argument, for the switching device in converter valve provides switching signal, thus controls the flowing of energy, realizes the communication with power network dispatching system simultaneously.The switching signal that control circuit produces by drive circuit is amplified, the driving active switching devices of high efficient and reliable.
Improvement as distribution commutator transformer of the present invention: this converter device can be single-input single-output or single input and multi-output.
In the present invention, high-pressure side converter valve is made up of the identical module of some structures, and the quantity of adjusting module can realize different electric pressures.Each module is made up of storage capacitor, switching device and corresponding drive circuit and module control circuit.Modular structure can adopt half-bridge structure, full bridge structure etc.
In the present invention, high-pressure side converter valve comprises switch module unit, brachium pontis inductance.Brachium pontis inductance effectively can limit the current ripples on brachium pontis, controls the energy transferring between former secondary simultaneously.Change high-pressure side converter valve output voltage and can adjust the energy that direct current transformation apparatus outputs to secondary.
In the present invention, high-pressure side converter valve brachium pontis adopts coupling inductance can reduce bridge arm current ripple, reduces commutator transformer system and impacts the high-frequency current that direct current network causes.
In the present invention, high frequency transformer secondary can be that single winding exports or multiple winding exports.And low-pressure side converter valve can be full-bridge circuit, half-bridge circuit or voltage-multiplying circuit etc.High frequency transformer can adopt a transformer or multiple transformer, and these transformers can be connected or use in parallel, to solve the less problem of single transformer power grade.
In the present invention, all pressing between each module of high-pressure side converter valve realizes mainly through active control method, selects mechanism comprising voltage, or loop control etc.
In the present invention, between mesohigh DC bus, do not need any electric capacity of cross-over connection, eliminate high withstand voltage electric capacity.Electric capacity containing balance instantaneous power in each module, and voltage is lower, and enforceability is strong, simultaneously safe and reliable.
In the present invention, the leakage inductance of high frequency transformer can be utilized to do energy transferring inductance, effectively utilize leakage inductance energy.
The present invention adopts modular design concept completely, increases by-pass switch in each module, and when this module goes wrong, this module of bypass, adopts redundant module to substitute this module, thus realize not power-off service.
Control high-pressure side converter valve output voltage adjustable output power in the present invention, also can by regulating the voltage shift Phase angle control power output of transformer primary secondary.
In the present invention, in order to realize higher frequency isolation, the switching device adopted in module is IGBT or high-withstand voltage MOSFET.
The present invention is further illustrated below in conjunction with the drawings and specific embodiments.
With reference to Fig. 1, whole converter system mainly comprises power electronics converter valve, high frequency transformer, drive circuit and control circuit.Power electronics converter valve comprises high-pressure side converter valve and low-pressure side converter valve.High-pressure side converter valve and low-pressure side converter valve all adopt active controllable device, and electric current can two-way flow, thus realizes energy in bidirectional flow.High-pressure side converter valve input is connected with medium voltage DC net, exports and is connected with the former avris of high frequency transformer.The secondary side of high frequency transformer is connected with low-pressure side converter valve input port.Comprise switching device in low-pressure side converter valve, it exports and is connected with low-voltage direct electrical network.
High-pressure side converter valve mainly comprises two or more change of current brachium pontis.Each brachium pontis is made up of upper and lower two and half brachium pontis, and each half brachium pontis comprises n modular unit SM ij(i=1,2,3,4...m; J=1,2 ... n) He one brachium pontis inductance.Form cascade structure between modules, thus realize high voltage.Each modular structure can adopt kind of the circuit structure of two shown in Fig. 2, or the circuit extended by it, and module-cascade number is determined by the withstand voltage of selected device and DC bus-bar voltage.Steady state voltage in each module is the 1/n of DC bus-bar voltage.Brachium pontis inductance, removes for High frequency filter, and outside the rush of current caused when preventing brachium pontis instantaneous voltage from not waiting with DC bus-bar voltage, the leakage inductance of this brachium pontis inductance and high frequency transformer is mainly used in controlling power output.By-pass switch is mainly used in this module of bypass when module breaks down, and completes replacing and the system maintenance of module when not power-off.High frequency transformer mainly realizes the conversion of electric pressure, realizes the electrical isolation of former secondary simultaneously.Low-pressure side converter valve realizes changing between high-frequency ac and low-voltage direct, thus realizes the bi-directional of energy.
It is a kind of control waveform schematic diagram in Fig. 3.The voltage of excitation cavity is not square-wave voltage completely, according to the adjustable different excitation voltage waveform of load variations, exports different power.Need in working control to add Pressure and Control, identical to ensure the steady state voltage of each module.Because former secondary all adopts active controllable device, therefore can control the voltage waveform of high frequency transformer vice-side winding, regulate the phase shifting angle of itself and original edge voltage adjust power output.Therefore, in this DC Transformer structure, multiple means can be had to realize the control of power output.Fig. 4 is main control block diagram.Whole system needs to realize effective control by central controller and module controller.
Due to the brachium pontis inductance in Fig. 1 circuit structure, be mainly used in controlling power output.Under identical driving voltage, increase this inductance value and can reduce power output.In order to ensure necessary power stage, this inductance value is usually less, is therefore difficult to the rush of current caused when suppressing brachium pontis instantaneous voltage not wait with DC bus-bar voltage.In order to reduce this rush of current, same brachium pontis two inductance adopt coupled structure, as shown in Figure 5.This coupling inductance only works to the high-frequency current ripple on brachium pontis, can not affect power stage and control.And electrical isolation grade is low between two windings, can effectively solve current ripples problem.
Fig. 6 to Figure 11 is the improvement of circuit structure shown in Fig. 1.Circuit shown in Fig. 6 is the commutator transformer schematic diagram that secondary adopts voltage-multiplying circuit.This structure can replace two active devices in secondary circuit with two electric capacity.Relative to former limit DC bus-bar voltage, secondary is that low-voltage direct exports, and therefore electric current is comparatively large, and device capacitance used is large, and cost is high.Utilize voltage-multiplying circuit can reduce the use of Large Copacity device, thus reduce costs.
Commutator transformer schematic diagram when Figure 7 shows that secondary multi-channel DC exports.This structure medium/high frequency transformer secondary adopts multiple winding, realizes multi-channel DC export in conjunction with multiple H bridge.According to the actual requirements, different voltage can be exported.Figure 8 shows that the circuit diagram of the multiple output voltage series connection of secondary.When output voltage is constant, every road output voltage is low, can utilize low-voltage, high-current device.
In DC Transformer structure shown in Fig. 9, the former limit series connection of multiple high frequency transformer, secondary exports separately.As the improvement of circuit structure shown in Fig. 9, secondary only can export a road, as shown in Figure 10.Figure 11 is the circuit diagram that the former limit of multiple high frequency transformer secondary in parallel exports separately.Circuit structure shown in Fig. 9-Figure 11, all adopts multiple high frequency transformer, and each transformer capacity is little, and cost of manufacture is low.
As the improvement of circuit structure shown in Fig. 1, circuit shown in Figure 12 can improve the capacity of commutator transformer further.Compare circuit shown in Fig. 1, this circuit mesohigh side converter valve expands to three brachium pontis by two brachium pontis, and high frequency transformer adopts three-phase transformer, and high-pressure side converter valve also expands to three brachium pontis by two brachium pontis.In this structure, output current ripple is less, can reduce the impact of current ripples to output capacitance.
As the improvement of Fig. 5 and Figure 12, the bridge arm of circuit shown in Figure 13 inductance adopts coupling inductance, can increase brachium pontis inductance, reduces bridge arm current ripple, and does not control to have an impact to power.
A kind of application example of DC convertor of Figure 14 for proposing in the present invention.Wherein high-pressure side converter valve, is made up of two brachium pontis, each brachium pontis comprises 4 module variable flow valve unit and 2 brachium pontis inductance.Modular unit adopts half-bridge structure, comprises two active switching devices and a module capacitance.Each modular unit is operated in conducting or off state, and in module during pipe conducting, modular unit is in conducting state, and Module-embedding is in brachium pontis.Under module during pipe conducting, modular unit is in off state, and module is bypassed from brachium pontis.Therefore control module unit open shutoff and exportable different voltage, thus control power output.The power output that working control can adopt multiple control modes to reach identical, such as Duty ratio control, phase shifting control etc.Described switching device is full-control type direct current device, such as IGBT, MOSFEF etc.
Above-mentioned specific embodiment is just in order to illustrate technical conceive of the present invention and application characteristic; its object is to allow the project planner being familiar with this field can understand Essence of the present invention and be applied, but can not therefore limit the scope of the invention.According to thinking of the present invention, each modular unit is not limited only to several circuit structures shown in Fig. 2.And the position of brachium pontis inductance is also not only shown in figure, because brachium pontis inductance is connected in arm path, any physical location therefore during practical application is all within the protection range of this patent.No matter there is how detailed description hereinbefore, also can implement the present invention by many modes.The details of foregoing circuit structure and control mode thereof performs in details can carry out considerable change at it, but it is still included in the present invention disclosed herein.All equivalent transformations of doing according to Spirit Essence of the present invention or modification, all should be encompassed within protection scope of the present invention.

Claims (6)

1. a distribution direct current transformation apparatus, comprises power electronics converter valve and high frequency transformer; It is characterized in that, described power electronics converter valve comprises high-pressure side converter valve and low-pressure side converter valve; Wherein, the input side of high-pressure side converter valve is directly connected with mesohigh direct current network, and its outlet side is connected with the former limit winding of high frequency transformer; The input side of low-pressure side converter valve is connected with the vice-side winding of high frequency transformer, and its outlet side is connected with low-voltage direct electrical network or energy-storage system; Wherein,
Described high-pressure side converter valve is made up of two change of current brachium pontis, and each change of current brachium pontis is by upper and lower two and half brachium pontis compositions, and each half brachium pontis includes a brachium pontis inductance and n modular unit SM ij, i=1,2,3,4; J=1,2 ..., n; Form cascade structure between adjacent modular unit, each modular unit comprises and forms half-bridge circuit or full-bridge circuit by switching device, or the circuit extended by aforementioned half-bridge circuit or full-bridge circuit, and a storage capacitor;
The connected mode of described low-pressure side converter valve and high frequency transformer is any one in following structure:
(1) low-pressure side converter valve is connected with the vice-side winding of high frequency transformer, and low-pressure side converter valve is full-bridge circuit, half-bridge circuit or voltage-multiplying circuit; Or
(2) secondary of high frequency transformer has multiple winding, and each winding is all connected to the combination of a H bridge and electric capacity and exports separately separately; Low-pressure side converter valve is made up of the combination of each H bridge and electric capacity, therefore has the same number of output with vice-side winding; Or
(3) secondary of high frequency transformer has multiple winding, and each winding is all connected to the combination of a H bridge and electric capacity and vice-side winding is connected successively; Low-pressure side converter valve is made up of the combination of each H bridge and electric capacity, therefore has an output; Or
(4) have multiple high frequency transformer, and each former limit winding is connected successively, each vice-side winding is all connected to the combination of a H bridge and electric capacity and exports separately separately; Low-pressure side converter valve is made up of the combination of each H bridge and electric capacity, therefore has the same number of output with vice-side winding; Or
(5) have multiple high frequency transformer, and each former limit winding is connected successively, each vice-side winding is all connected to the combination of a H bridge and electric capacity and its output is connected; Low-pressure side converter valve is made up of the combination of each H bridge and electric capacity, therefore has an output; Or
(6) have multiple high frequency transformer, and each former limit winding is parallel with one another, each vice-side winding is all connected to the combination of a H bridge and electric capacity and exports separately separately; Low-pressure side converter valve is made up of the combination of each H bridge and electric capacity, therefore has the same number of output with vice-side winding;
Described device also comprises the central controller, module controller, control circuit and the drive circuit that are connected successively, and drive circuit is connected to the switching device in high-pressure side converter valve and low-pressure side converter valve respectively, to realize switch control rule.
2. a distribution direct current transformation apparatus, comprises power electronics converter valve and high frequency transformer; It is characterized in that, described converter valve comprises high-pressure side converter valve and low-pressure side converter valve; Wherein, the input side of high-pressure side converter valve is directly connected with mesohigh direct current network, and its outlet side is connected with the former limit winding of high frequency transformer; The input side of low-pressure side converter valve is connected with the vice-side winding of high frequency transformer, and its outlet side is connected with low-voltage direct electrical network; Wherein,
Described high-pressure side converter valve is made up of three change of current brachium pontis, and each inverter bridge leg is made up of upper and lower two and half brachium pontis, and each half brachium pontis includes a brachium pontis inductance and n modular unit SM ij, i=1,2,3,4,5,6; J=1,2 ..., n; Form cascade structure between adjacent modular unit, each modular unit comprises and forms half-bridge circuit or full-bridge circuit by switching device, or the circuit extended by aforementioned half-bridge circuit or full-bridge circuit, and a storage capacitor; Described high frequency transformer is three-phase transformer; Comprise switching device in described low-pressure side converter valve, there are three bridge arm structures.
3. device according to claim 1 and 2, is characterized in that, in the converter valve of described high-pressure side, two brachium pontis inductance in same change of current brachium pontis adopt coupled structure.
4. device according to claim 1 and 2, is characterized in that, in the change of current brachium pontis of described high-pressure side converter valve, each modular unit is equipped with by-pass switch.
5. device according to claim 1 and 2, is characterized in that, described energy-storage system is lead-acid battery or lithium battery.
6. device according to claim 1 and 2, is characterized in that, the switching device adopted in the modular unit of described high-pressure side converter valve is IGBT or MOSFET.
CN201410658340.3A 2014-11-18 2014-11-18 Direct current transformer device used for power distribution Pending CN104485821A (en)

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CN105048812A (en) * 2015-07-17 2015-11-11 许继电源有限公司 LLC resonant circuit
CN105099206A (en) * 2015-08-18 2015-11-25 南车株洲电力机车研究所有限公司 Direct current-direct current solid-state transformer
CN105471267A (en) * 2015-12-10 2016-04-06 西华大学 High-voltage high-power DC-DC converter adopting modular structure
CN106329559A (en) * 2016-09-13 2017-01-11 哈尔滨工业大学 Serial connection type direct current power transmission tapping device
CN106887952A (en) * 2015-12-15 2017-06-23 中国电力科学研究院 A kind of commutator transformer and its implementation that direct current network is accessed for new energy
CN107546984A (en) * 2017-01-20 2018-01-05 湖南大学 A kind of high-power modular HVDC converter of integrating filtering transformer
CN107887924A (en) * 2017-12-20 2018-04-06 北京金风科创风电设备有限公司 Fan power transmission system
CN109950937A (en) * 2019-04-16 2019-06-28 诺丁汉(余姚)智能电气化研究院有限公司 A kind of topological structure of the isolated power inverter of distribution of driving AC load
CN109951084A (en) * 2019-04-03 2019-06-28 浙江大学 The high-power high no-load voltage ratio resonant mode DC power supply of one kind and its working method
CN109980936A (en) * 2019-03-26 2019-07-05 浙江大学 The voltage control method of modular multilevel structure resonance converter
CN110022071A (en) * 2019-04-18 2019-07-16 清华大学 Hybrid energy-storing type commutator transformer and its control method
US10819112B1 (en) 2019-03-27 2020-10-27 Abb Schweiz Ag Feeder line fault response using direct current interconnection system
CN112152464A (en) * 2020-09-04 2020-12-29 东南大学 Device series type direct current transformer with fault blocking capability and control method thereof
US10971934B2 (en) 2018-12-31 2021-04-06 Abb Schweiz Ag Distribution networks with flexible direct current interconnection system
US11031773B2 (en) 2019-03-27 2021-06-08 Abb Power Grids Switzerland Ag Transformer isolation response using direct current link
US11121543B2 (en) 2018-12-31 2021-09-14 Abb Schweiz Ag Fault mitigation in medium voltage distribution networks

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Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105048812B (en) * 2015-07-17 2018-09-28 许继电源有限公司 A kind of LLC resonance circuits
CN105048812A (en) * 2015-07-17 2015-11-11 许继电源有限公司 LLC resonant circuit
CN105099206A (en) * 2015-08-18 2015-11-25 南车株洲电力机车研究所有限公司 Direct current-direct current solid-state transformer
CN105471267A (en) * 2015-12-10 2016-04-06 西华大学 High-voltage high-power DC-DC converter adopting modular structure
CN106887952A (en) * 2015-12-15 2017-06-23 中国电力科学研究院 A kind of commutator transformer and its implementation that direct current network is accessed for new energy
CN106329559A (en) * 2016-09-13 2017-01-11 哈尔滨工业大学 Serial connection type direct current power transmission tapping device
CN107546984A (en) * 2017-01-20 2018-01-05 湖南大学 A kind of high-power modular HVDC converter of integrating filtering transformer
CN107887924A (en) * 2017-12-20 2018-04-06 北京金风科创风电设备有限公司 Fan power transmission system
US11121543B2 (en) 2018-12-31 2021-09-14 Abb Schweiz Ag Fault mitigation in medium voltage distribution networks
US10971934B2 (en) 2018-12-31 2021-04-06 Abb Schweiz Ag Distribution networks with flexible direct current interconnection system
CN109980936B (en) * 2019-03-26 2021-03-26 浙江大学 Voltage control method of modular multilevel structure resonant converter
CN109980936A (en) * 2019-03-26 2019-07-05 浙江大学 The voltage control method of modular multilevel structure resonance converter
US11031773B2 (en) 2019-03-27 2021-06-08 Abb Power Grids Switzerland Ag Transformer isolation response using direct current link
US10819112B1 (en) 2019-03-27 2020-10-27 Abb Schweiz Ag Feeder line fault response using direct current interconnection system
CN109951084A (en) * 2019-04-03 2019-06-28 浙江大学 The high-power high no-load voltage ratio resonant mode DC power supply of one kind and its working method
CN109950937A (en) * 2019-04-16 2019-06-28 诺丁汉(余姚)智能电气化研究院有限公司 A kind of topological structure of the isolated power inverter of distribution of driving AC load
CN110022071B (en) * 2019-04-18 2020-07-10 清华大学 Hybrid energy storage type direct current transformer and control method thereof
CN110022071A (en) * 2019-04-18 2019-07-16 清华大学 Hybrid energy-storing type commutator transformer and its control method
CN112152464A (en) * 2020-09-04 2020-12-29 东南大学 Device series type direct current transformer with fault blocking capability and control method thereof

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