CN203491898U - Bidirectional tide-controlled modularized multi-level mutually-balanced solid-state transformer - Google Patents
Bidirectional tide-controlled modularized multi-level mutually-balanced solid-state transformer Download PDFInfo
- Publication number
- CN203491898U CN203491898U CN201320632837.9U CN201320632837U CN203491898U CN 203491898 U CN203491898 U CN 203491898U CN 201320632837 U CN201320632837 U CN 201320632837U CN 203491898 U CN203491898 U CN 203491898U
- Authority
- CN
- China
- Prior art keywords
- phase
- pressure stage
- solid
- transformer
- level
- 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 - Lifetime
Links
- 230000002457 bidirectional effect Effects 0.000 title abstract 3
- 238000002955 isolation Methods 0.000 claims abstract description 43
- 239000007787 solid Substances 0.000 claims abstract description 14
- 230000009466 transformation Effects 0.000 claims abstract description 11
- 239000003990 capacitor Substances 0.000 claims description 9
- 238000013461 design Methods 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000006243 chemical reaction Methods 0.000 description 11
- 238000000034 method Methods 0.000 description 11
- 238000010586 diagram Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 208000035126 Facies Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000000819 phase cycle Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
Landscapes
- Ac-Ac Conversion (AREA)
Abstract
The utility model relates to a bidirectional tide-controlled modularized multi-level mutually-balanced solid-state transformer. The solid-state transformer is a three-phase solid-state transformer of a mutually-balanced structure, an AC-DC-AC three-level type transformation structure is employed, and the AC-DC-AC three-level type transformation structure comprises a high voltage level, an isolation level and a low voltage level. In the transformer, the structures of three phases of the high voltage level/the isolation level are the same; the high voltage level and the isolation level are respectively composed of subunits, and the low voltage level is an individual integrated module and an automatic mutually-balanced structure is achieved; three-phase subunits of the high voltage level are connected with each other in a star-shaped mode, the low voltage level is an AC output terminal in a three-phase four-wire wiring mode, and the solid state transformer can achieve power bidirectional flow. An independent structure is employed by the whole three-phase system provided by the utility model, independent control and modularization production of the three phases are convenient, a low voltage level direct current bus parallel connection module makes the solid-state transformer have a three phase electric energy automatic mutually-balanced function, and therefore the solid-state transformer is practical.
Description
Technical field
The utility model relates to a kind of electric power electric transformer, specifically relates to the mutual balance solid-state transformer of modular multilevel that a kind of bi-directional current is controlled.
Background technology
Solid-state transformer is called again electric power electric transformer or flexible transformer, it is that to take Technics of Power Electronic Conversion technology and electromagnetic induction technology be basic novel transformer, it has changed the system configuration of traditional transformer thoroughly, is the critical equipment that intelligent grid of future generation is built.Yet owing to being subject to the restriction of power electronic device development level, be adapted to the high pressure of electrical network demand, the solid-state transformer of high-power, large electric current from practical also far apart.
Solid-state transformer is the novel electric power transformer progressively growing up along with the development of high-power electric and electronic technology in recent years.It is being realized on the basis of the basic functions such as conventional electric power transformer voltage grade transformation, electrical isolation and energy transmission, can also realize many additional functionalities such as trend control, quality of power supply control, this is because it can comprise electrical energy parameters such as the amplitude of voltage (or electric current), phase place, frequency, the number of phases, phase sequence and waveforms in working control, structurally, it comprises two fundamentals: converters and in (height) frequency power transformer.Converters mainly comprises power electronic device, controller, filter and auxiliary equipment, mainly completes the functions such as protection and the conversion of electric energy and control; The function of high frequency transformer is isolation and electric pressure conversion, and frequency is usually operated at KHz (kHz) rank, and the object of high frequency is mainly significantly to dwindle the volume of transformer, weight reduction, minimizing heat radiation and raising capacity and efficiency etc.
The specific implementation of solid-state transformer is divided two kinds of forms: the one, and, in conversion, not containing DC link, directly AC/AC converts; The 2nd,, in conversion, introduce DC link: at high voltage side of transformer, carry out AC/DC conversion, by HVDC Modulation, be that high-frequency square-wave signal is realized electromagnetic coupled through high frequency transformer again, and again the high-frequency square-wave signal after coupling is reduced to DC(isolation level), and then carry out DC/AC conversion in low-pressure side, realize the power supply to load.This structure can realize hiigh pressure stage power factor correction, the two-way flow of the harmonic wave of can drawing up simultaneously.Two schemes relatively, the latter's control characteristic is good, can realize the flexible control of transformer high-voltage low-pressure side voltage, electric current and power by PWM modulation technique, progressively becomes solid-state transformer main developing direction from now on.
Adopt full-control type composite electric electronic device IGBT, can realize the flexible control of solid-state transformer, facilitate it can be at four quadrant running.Yet the highest withstand voltage of this kind of device is lower than 6.5 kilovolts at present, and current power distribution network low voltage distribution transformer is also more than 10 kilovolts, if adopt the mode of device series average-voltage, also must install in addition equalizer circuit and control method additional, even the two level structures that adopt power device directly to connect, also have dynamic and static voltage-sharing, and dv/dt are larger, can produce reluctant electromagnetic interference problem, exist the hidden danger such as power device inefficacy even punctures.
Utility model content
For the deficiencies in the prior art, the purpose of this utility model is to provide the modular multilevel solid-state transformer that a kind of bi-directional current is controlled, the solid-state transformer that the utility model provides is based on mutual balancing technique, the main structure adopting is AC-DC-AC tri-rank modes, possesses hiigh pressure stage, isolation level and low-pressure stage.Main circuit topology hiigh pressure stage has adopted many level of diode-clamped Structural Transformation device, and many level structure can make harmonic wave of output voltage content lower, and devices switch frequency is low, switching loss is little, stresses of parts is little, without dynamic voltage balancing, thereby makes solid-state transformer adapt to higher electric pressure.Whole three-phase system adopts that absolute construction facilitates three-phase independent control and modularization is produced, and the circuit topology itself designing had three-phase electric energy automatic mutual equilibrium function concurrently, thus solved the practical problem of solid-state transformer.
The purpose of this utility model is to adopt following technical proposals to realize:
The mutual balance solid-state transformer of modular multilevel that the utility model provides a kind of bi-directional current to control, its improvements are, described solid-state transformer is the three-phase solid transformer that utilizes mutual balanced structure method for designing, the three-stage type mapped structure that adopts AC-DC-AC, comprises hiigh pressure stage, isolation level and low-pressure stage;
The transformer that described hiigh pressure stage is identical with isolation level three-phase structure; Hiigh pressure stage and isolation level form by subelement; Low-pressure stage is that independent integral module is realized automatic mutual balanced structure; Described hiigh pressure stage three-phase subelement connects by star fashion, and low-pressure stage is the ac output end of the three-phase and four-line mode of connection; Solid-state transformer can be realized to and fro flow of power.
Further, described hiigh pressure stage subelement adopts many level of diode-clamped single-phase full bridge module; The level quantity of described many level single-phase full bridge module is set according to the withstand voltage level of solid-state transformer high-pressure side rated voltage and power electronic device.
Further, described many level single-phase full bridge module, comprises two-phase four brachium pontis, and two brachium pontis up and down of every phase connect by clamping diode series arm; Each brachium pontis is in series by IGBT device; Described diode series arm is composed in series by diode;
Two-phase brachium pontis is in parallel with hiigh pressure stage DC bus, and described hiigh pressure stage DC bus consists of two groups of capacitances in series; The mid point of hiigh pressure stage DC bus is connected with the mid point of every mutually upper and lower two brachium pontis clamping diode series arms respectively.
Further, described isolation level subelement comprises many level of diode-clamped single-phase semi-bridge module, high frequency transformer and single-phase H bridge;
Described many level of diode-clamped single-phase semi-bridge module is connected by hiigh pressure stage DC bus back-to-back with many level of diode-clamped single-phase full bridge module of hiigh pressure stage, by hiigh pressure stage DC bus mid point, is connected respectively with the on high-tension side 1 road input of many level of diode-clamped single-phase semi-bridge module and high frequency transformer;
High frequency transformer is 1 to enter 3 and go out structure, for realizing high-pressure side and low-pressure side high frequency square wave voltage grade transformation and electrical isolation;
The number of described single-phase H bridge is that 3,3 single-phase H bridge correspondences are connected with 3 outputs of high frequency transformer, 33 tunnels output access low-pressure stage DC bus parallel modules that single-phase H bridge is corresponding.
Further, described many level of diode-clamped single-phase semi-bridge module, comprising: with the half-bridge of clamping diode series arm; Half-bridge comprises upper and lower two brachium pontis, and each brachium pontis is in series by IGBT device; Described diode series arm is composed in series by diode; Many level of diode clamp single-phase semi-bridge module is in parallel with hiigh pressure stage DC bus, and described hiigh pressure stage DC bus consists of upper and lower two groups of electric capacity; The mid point of clamping diode series arm is connected with the mid point of hiigh pressure stage DC bus.
Further, the low-pressure stage of described three-phase solid transformer becomes needed interchange for realizing by the DC converting of coming from isolation level; Described low-pressure stage comprises low-pressure stage DC bus parallel module, 3 single-phase full bridge inversion modules and 3 LC filters;
Further, the direct current output DC that described low-pressure stage DC bus parallel module forms 3 subelements of isolation level
ai, DC
bi, DC
cibe connected in parallel accordingly, form the low-pressure stage DC bus DC of 3 single-phase full bridge inversion modules of three-phase solid transformer low voltage level
a, DC
b, DC
c, the direct current output of three low-pressure stage DC buss is connected respectively with 3 single-phase full bridge inversion modules.
Further, described 3 single-phase full bridge inversion module structures are identical, each single-phase full bridge inversion module comprises two-phase four brachium pontis, and two brachium pontis up and down of every phase connect by 1 LC filter, and described 3 LC filters are respectively the first filter, the second filter and the 3rd filter;
Described 3 LC filters form by filter inductance and filter capacitor, the filter inductance of the first filter be connected to single-phase full bridge inversion module wherein a phase up and down between two brachium pontis as output, its filter capacitor is connected to up and down between two brachium pontis of another phase, more in parallel as the 4th output with the filter capacitor of the second filter and the 3rd filter respectively; The filter inductance of the second filter is as second output, and the filter inductance of the 3rd filter is as the 3rd output,
Above-mentioned four outputs form the output of three-phase four mode of connection solid-state transformers.
Compared with the prior art, the beneficial effect that the utility model reaches is:
1, the utility model is with full-control type multiple device insulated gate bipolar transistor (Insulated Gate Bipolar Transistor, IGBT) build the mutual balancing technique of many level of three-phase solid-state transformer main circuit topology, both can solve the high voltage problem that adapts to electrical network demand, can also topological functions, automatically complete the mutual equilibrium function of three phase supply, and possesses four quadrant running ability, facilitate modularization to produce simultaneously, thereby solve development towards the commerciality solid-state transformer problem of practical application.
2, solid-state transformer of the present utility model designs based on mutual balancing technique, and the main structure of employing is AC-DC-AC mode, possesses hiigh pressure stage, isolation level and low-pressure stage.Main circuit topology hiigh pressure stage has adopted many level of diode-clamped Structural Transformation device, and many level structure can make harmonic wave of output voltage content lower, and devices switch frequency is low, switching loss is little, stresses of parts is little, without dynamic voltage balancing, thereby makes solid-state transformer adapt to higher electric pressure.Whole three-phase system adopts that absolute construction facilitates three-phase independent control and modularization is produced, and the circuit topology itself designing had three-phase electric energy automatic mutual equilibrium function concurrently, thus solved the practical problem of solid-state transformer.
3, the solid-state transformer that the utility model provides adopts many level of diode clamp structure, not only can reduce device usage quantity but also can adapt to high voltage grade; Adopt three-phase sub-unit structure, facilitate three-phase independently to control and can realize again modularization production.
4, the high frequency transformer in isolation level adopts 1 phase transformation 3 mutually and the mutual balanced design of low-pressure stage DC bus crisscross parallel, can realize when low-pressure side or high-pressure side system generation three-phase imbalance, need not adopt special control strategy just can automatically maintain the original poised state of whole system.In isolation level, adopt many level single-phase semi-bridge structure, because less demanding only just electrical isolation and the electric pressure conversion of controlling electric energy due to isolation level, so this structure is conducive to save number of devices in the situation that meeting basic demand, reduce energy consumption and cost.
5, the direct current output that low-voltage direct bus parallel module forms 3 unit of isolation level is connected in parallel accordingly, the DC bus that forms 3 single-phase full bridge inversion modules of three-phase solid transformer low voltage level, at low-voltage bus bar DC side crisscross parallel, its great advantage is that from structure, to have solved solid-state transformer high, low-pressure side system is unbalanced to influence each other, and automatically improved power supply reliability, as long as a submodule normal operation just can guarantee basic electricity, greatly improved operational reliability, simple in structure, it is convenient to control, this is also the crucial topologies that realizes this solid-state transformer automatic mutual balance.
6, the solid-state transformer that the utility model provides can be realized to and fro flow of power.
Accompanying drawing explanation
Fig. 1 is the topology diagram of the mutual balance solid-state transformer of modular multilevel controlled of the bi-directional current that provides of the utility model;
Fig. 2 is the schematic diagram of the mutual balance solid-state transformer of modular multilevel controlled of the bi-directional current that provides of the utility model;
Fig. 3 is the low-pressure stage DC bus parallel module winding diagram of the mutual balance solid-state transformer of modular multilevel that provides of the utility model.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in further detail.
The topology diagram of the modular multilevel solid-state transformer that the bi-directional current that the utility model provides is controlled as shown in Figure 1, adopt the 3 stepwise mapped structures of AC-DC-AC, comprise a hiigh pressure stage, an isolation level and a low-pressure stage, hiigh pressure stage and the isolation level of the solid-state transformer of application three mutual balanced designs consist of three " a phase transformation three-phase " subelements.
1. hiigh pressure stage:
For realistic electric pressure demand, hiigh pressure stage subelement adopts many level of diode-clamped single-phase full bridge module, the level number amount of single-phase full bridge depends on the withstand voltage level of high-pressure side rated voltage and power electronic device, the schematic diagram of the modular multilevel solid-state transformer that the bi-directional current that the utility model provides is controlled as shown in Figure 2, the three level structures of take are example, also can conveniently expand to more high level.This structure makes harmonic content few, and switching loss is less, and efficiency is high.In order to guarantee that the electric current of high-pressure side system has good sinusoidal waveform and realizes power factor, control flexibly, single-phase full bridge adopts SVPWM rectifier operations, and bi-directional current adds parallel network reverse to control function while controlling.Three-phase high-voltage level subelement form star " Y " version, form the hiigh pressure stage of three-phase solid transformer.
Many level single-phase full bridge module comprises two-phase four brachium pontis, and two brachium pontis up and down of every phase connect by clamping diode series arm; Each brachium pontis is in series by IGBT device; Described diode series arm is composed in series by diode.Two-phase brachium pontis is in parallel with hiigh pressure stage DC bus, and described hiigh pressure stage DC bus consists of two groups of capacitances in series; The mid point of hiigh pressure stage DC bus is connected with the mid point of every mutually upper and lower two brachium pontis clamping diode series arms respectively.
2. isolation level:
Isolation level subelement enters 3 by 1 preposition many level of diode-clamped single-phase semi-bridge module, 11 and goes out high frequency transformer and 3 rearmounted H bridges form.Rearmounted H bridge is phase structure.Preposition many level of rectification single-phase semi-bridge module is connected back-to-back with single-phase many Level Full Bridges module rectification of hiigh pressure stage, complete the conversion of DC/ high frequency square wave, be connected with the 1 tunnel input of high frequency transformer high-pressure side, adopting many level single-phase semi-bridge structure is herein because of less demanding only just electrical isolation and the electric pressure conversion of the controlling electric energy due to isolation level, so this structure is conducive to save number of devices in the situation that meeting basic demand, reduce energy consumption and cost.High frequency transformer 1 enters 3 and goes out, and realizes high-pressure side and low-pressure side high frequency square wave voltage grade transformation and electrical isolation.3 corresponding connections of output of rearmounted 3 single-phase H bridges and high frequency transformer, 3 tunnels are exported and are accessed low-pressure stage DC bus parallel modules, in parallel with the subelement direct current output cross of other two-phases.
When power is flowed to low-pressure stage by hiigh pressure stage, preposition many level single-phase semi-bridge becomes high frequency square wave by DC converting, by high frequency transformer, is magnetically coupled to low pressure, is more again rectified into direct current by rearmounted H bridge.
Otherwise rearmounted H bridge carries out DC inversion, preposition many level single-phase semi-bridge module is responsible for rectification.The subelement of three-phase isolation level, combines the isolation level that forms three-phase solid transformer.
Described many level of diode-clamped single-phase semi-bridge module comprises the half-bridge with clamping diode series arm; Half-bridge comprises upper and lower two brachium pontis, and each brachium pontis is in series by IGBT device; Described diode series arm is composed in series by diode.
3. low-pressure stage:
Whole three-phase low-voltage level mainly realizes the direct current coming from isolation level is become to needed interchange.It comprises that low-pressure stage DC bus parallel module, 3 single-phase full bridge inversion modules and LC filter form.When forming three-phase solid transformer low voltage level, as shown in Figure 3, the direct current output DC that low-voltage direct bus parallel module forms 3 unit of isolation level
ai, DC
bi, DC
ci(i=1,2,3) are connected in parallel accordingly, form the DC bus DC of 3 single-phase full bridge inversion modules of three-phase solid transformer low voltage level
a, DC
b, DC
c.This great advantage at low-voltage bus bar DC side crisscross parallel is to have solved unbalanced the influencing each other of solid-state transformer high and low pressure side system from structure, and automatically improved power supply reliability, as long as a submodule normal operation just can guarantee basic electricity, greatly improved operational reliability, simple in structure, it is convenient to control, and this is also the crucial topologies that realizes this solid-state transformer automatic mutual balance.3 single-phase full bridge inversion modules are exported needed low-voltage alternating-current through LC filter, adopt the two closed-loop controls of single facies-controlled instantaneous voltage and effective value, guarantee the quality of power supply, finally form the output of the three-phase and four-line mode of connection.
3 single-phase full bridge inversion module structures are identical, and each single-phase full bridge inversion module comprises two-phase four brachium pontis, and two brachium pontis up and down of every phase connect by 1 LC filter, and described 3 LC filters are respectively the first filter, the second filter and the 3rd filter;
Described 3 LC filters form by filter inductance and filter capacitor, the filter inductance of the first filter be connected to single-phase full bridge inversion module wherein a phase up and down between two brachium pontis as output, its filter capacitor be connected to another phase up and down between two brachium pontis after, in parallel as the 4th output with the filter capacitor of the second filter and the 3rd filter respectively; The filter inductance of the second filter is as second output, and the filter inductance of the 3rd filter is as the 3rd output,
Above-mentioned four outputs form the output of three-phase four mode of connection solid-state transformers.
The utility model also provides a kind of implementation method of modular multilevel solid-state transformer of bi-directional current control, and the method adopts modular multilevel solid-state transformer to realize, and comprises the steps:
A, electrical network power frequency sine wave alternating current is input to the hiigh pressure stage of solid-state transformer, described power frequency sine wave alternating current be take the rectification of SVPWM modulation control mode as direct current and keeps direct voltage constant through hiigh pressure stage conversion module, power factor unit moves, and is input to the isolation level of solid-state transformer;
B, preposition many level of the diode-clamped single-phase semi-bridge module of isolation level are transformed into high frequency square wave by direct current, by 1, enter 3 high frequency transformers that go out and be magnetically coupled to low pressure, be more again rectified into by 3 single-phase H bridges of postposition the low-pressure stage that is input to solid-state transformer after direct current;
The direct current output DC that the low-voltage direct bus parallel module of C, low-pressure stage forms 3 subelements of isolation level
ai, DC
bi, DC
cibe connected in parallel accordingly, form the low-pressure stage DC bus DC of 3 single-phase full bridge inversion modules of three-phase solid transformer low voltage level
a, DC
b, DC
c, this connected mode makes utility model automatically possess the function of three mutual balances, need not carry out other control measure again, has solved that high and low pressure side system is unbalanced to influence each other from structure.Article three, the direct current of low-pressure stage DC bus outputs to 3 single-phase full bridge inversion modules; 3 single-phase full bridge inversion modules are exported needed low-voltage alternating-current through LC filter by inversion control.
The utility model also provides a kind of implementation method of the mutual balance solid-state transformer of modular multilevel of bi-directional current control, and described method adopts modular multilevel solid-state transformer to realize, and under grid-connected pattern, comprises the steps:
1. direct current is input to three low-pressure stage DC buss of low-pressure stage, the direct current of three low-pressure stage DC buss outputs to 3 single-phase full bridge inversion modules; 3 single-phase full bridge inversion modules, through LC filter, are exported needed low-voltage alternating-current by inversion control;
2. direct current input is carried out DC inversion by low-pressure stage DC bus parallel module through 3 single-phase H bridges of isolation level postposition, by DC converting, it is high-frequency ac square wave, after boosting, high frequency transformer is input to preposition many level of diode-clamped single-phase semi-bridge module for rectification, by the rectification of high-frequency ac square wave, be direct current, through hiigh pressure stage DC bus, be input to hiigh pressure stage;
3. by parallel network reverse, to control DC inversion be the power frequency sine wave alternating current that meets the grid-connected requirement of electrical network to hiigh pressure stage, to grid transmission.
Solid-state transformer of the present utility model designs based on mutual balancing technique, and the main structure of employing is AC-DC-AC mode, possesses hiigh pressure stage, isolation level and low-pressure stage.Main circuit topology hiigh pressure stage has adopted many level of diode-clamped Structural Transformation device, and many level structure can make harmonic wave of output voltage content lower, and devices switch frequency is low, switching loss is little, stresses of parts is little, without dynamic voltage balancing, thereby makes solid-state transformer adapt to higher electric pressure.Whole three-phase solid transformer adopting absolute construction facilitates three-phase independent control and modularization is produced, and the circuit topology itself designing had three-phase electric energy automatic mutual equilibrium function concurrently, thus solved the practical problem of solid-state transformer.
Finally should be noted that: above embodiment is only in order to illustrate that the technical solution of the utility model is not intended to limit, although the utility model is had been described in detail with reference to above-described embodiment, those of ordinary skill in the field are to be understood that: still can modify or be equal to replacement embodiment of the present utility model, and do not depart from any modification of the utility model spirit and scope or be equal to replacement, it all should be encompassed in the middle of claim scope of the present utility model.
Claims (8)
1. the mutual balance solid-state transformer of modular multilevel that a bi-directional current is controlled, it is characterized in that, described solid-state transformer is the three-phase solid transformer that utilizes mutual balanced structure design, adopts the three-stage type mapped structure of AC-DC-AC, comprises hiigh pressure stage, isolation level and low-pressure stage;
The transformer that described hiigh pressure stage is identical with isolation level three-phase structure; Hiigh pressure stage and isolation level form by subelement; Low-pressure stage is that independent integral module is realized automatic mutual balanced structure; Described hiigh pressure stage three-phase subelement connects by star fashion, and low-pressure stage is the ac output end of the three-phase and four-line mode of connection; Solid-state transformer can be realized to and fro flow of power.
2. the mutual balance solid-state transformer of modular multilevel as claimed in claim 1, is characterized in that, described hiigh pressure stage subelement adopts many level of diode-clamped single-phase full bridge module; The level quantity of described many level single-phase full bridge module is set according to the withstand voltage level of solid-state transformer high-pressure side rated voltage and power electronic device.
3. the mutual balance solid-state transformer of modular multilevel as claimed in claim 2, is characterized in that, described many level single-phase full bridge module, comprises two-phase four brachium pontis, and two brachium pontis up and down of every phase connect by clamping diode series arm; Each brachium pontis is in series by IGBT device; Described diode series arm is composed in series by diode;
Two-phase brachium pontis is in parallel with hiigh pressure stage DC bus, and described hiigh pressure stage DC bus consists of two groups of capacitances in series; The mid point of hiigh pressure stage DC bus is connected with the mid point of every mutually upper and lower two brachium pontis clamping diode series arms respectively.
4. the mutual balance solid-state transformer of modular multilevel as claimed in claim 1, is characterized in that, described isolation level subelement comprises many level of diode-clamped single-phase semi-bridge module, high frequency transformer and single-phase H bridge;
Described many level of diode-clamped single-phase semi-bridge module is connected by hiigh pressure stage DC bus back-to-back with many level of diode-clamped single-phase full bridge module of hiigh pressure stage, by hiigh pressure stage DC bus mid point, is connected respectively with the on high-tension side 1 road input of many level of diode-clamped single-phase semi-bridge module and high frequency transformer;
High frequency transformer is 1 to enter 3 and go out structure, for realizing high-pressure side and low-pressure side high frequency square wave voltage grade transformation and electrical isolation;
The number of described single-phase H bridge is that 3,3 single-phase H bridge correspondences are connected with 3 outputs of high frequency transformer, 33 tunnels output access low-pressure stage DC bus parallel modules that single-phase H bridge is corresponding.
5. the mutual balance solid-state transformer of modular multilevel as claimed in claim 4, is characterized in that, described many level of diode-clamped single-phase semi-bridge module, comprising: with the half-bridge of clamping diode series arm; Half-bridge comprises upper and lower two brachium pontis, and each brachium pontis is in series by IGBT device; Described diode series arm is composed in series by diode; Many level of diode clamp single-phase semi-bridge module is in parallel with hiigh pressure stage DC bus, and described hiigh pressure stage DC bus consists of upper and lower two groups of electric capacity; The mid point of clamping diode series arm is connected with the mid point of hiigh pressure stage DC bus.
6. the mutual balance solid-state transformer of modular multilevel as claimed in claim 1, is characterized in that, the low-pressure stage of described three-phase solid transformer becomes needed interchange for realizing by the DC converting of coming from isolation level; Described low-pressure stage comprises low-pressure stage DC bus parallel module, 3 single-phase full bridge inversion modules and 3 LC filters;
7. the mutual balance solid-state transformer of modular multilevel as claimed in claim 6, is characterized in that, the direct current output DC that described low-pressure stage DC bus parallel module forms 3 subelements of isolation level
ai, DC
bi, DC
cibe connected in parallel accordingly, form the low-pressure stage DC bus DC of 3 single-phase full bridge inversion modules of three-phase solid transformer low voltage level
a, DC
b, DC
c, the direct current output of three low-pressure stage DC buss is connected respectively with 3 single-phase full bridge inversion modules.
8. the mutual balance solid-state transformer of modular multilevel as claimed in claim 7, it is characterized in that, described 3 single-phase full bridge inversion module structures are identical, each single-phase full bridge inversion module comprises two-phase four brachium pontis, two brachium pontis up and down of every phase connect by 1 LC filter, and described 3 LC filters are respectively the first filter, the second filter and the 3rd filter;
Described 3 LC filters form by filter inductance and filter capacitor, the filter inductance of the first filter be connected to single-phase full bridge inversion module wherein a phase up and down between two brachium pontis as output, its filter capacitor is connected to up and down between two brachium pontis of another phase, more in parallel as the 4th output with the filter capacitor of the second filter and the 3rd filter respectively; The filter inductance of the second filter is as second output, and the filter inductance of the 3rd filter is as the 3rd output,
Above-mentioned four outputs form the output of three-phase four mode of connection solid-state transformers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320632837.9U CN203491898U (en) | 2013-10-14 | 2013-10-14 | Bidirectional tide-controlled modularized multi-level mutually-balanced solid-state transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320632837.9U CN203491898U (en) | 2013-10-14 | 2013-10-14 | Bidirectional tide-controlled modularized multi-level mutually-balanced solid-state transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203491898U true CN203491898U (en) | 2014-03-19 |
Family
ID=50262698
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320632837.9U Expired - Lifetime CN203491898U (en) | 2013-10-14 | 2013-10-14 | Bidirectional tide-controlled modularized multi-level mutually-balanced solid-state transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203491898U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104009463A (en) * | 2014-06-13 | 2014-08-27 | 国家电网公司 | Series type tidal current controller suitable for direct current power transmission |
| CN104135164A (en) * | 2014-07-30 | 2014-11-05 | 中国东方电气集团有限公司 | Interleaved parallel multi-level electronic power transformer |
| CN104538977A (en) * | 2015-01-06 | 2015-04-22 | 东南大学 | Static synchronous compensation device |
| CN106230079A (en) * | 2016-08-10 | 2016-12-14 | 江苏林洋能源股份有限公司 | Split-phase type low-power consumption energy accumulation current converter and control method thereof and control system |
| CN109713917A (en) * | 2017-10-25 | 2019-05-03 | 中兴通讯股份有限公司 | Fairing and rectification control method |
| CN112421966A (en) * | 2019-08-22 | 2021-02-26 | 南京南瑞继保电气有限公司 | Solid-state transformer |
-
2013
- 2013-10-14 CN CN201320632837.9U patent/CN203491898U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104009463A (en) * | 2014-06-13 | 2014-08-27 | 国家电网公司 | Series type tidal current controller suitable for direct current power transmission |
| CN104135164A (en) * | 2014-07-30 | 2014-11-05 | 中国东方电气集团有限公司 | Interleaved parallel multi-level electronic power transformer |
| CN104538977A (en) * | 2015-01-06 | 2015-04-22 | 东南大学 | Static synchronous compensation device |
| CN106230079A (en) * | 2016-08-10 | 2016-12-14 | 江苏林洋能源股份有限公司 | Split-phase type low-power consumption energy accumulation current converter and control method thereof and control system |
| CN106230079B (en) * | 2016-08-10 | 2019-11-05 | 江苏林洋能源股份有限公司 | Split-phase type low-power consumption energy accumulation current converter and its control method and control system |
| CN109713917A (en) * | 2017-10-25 | 2019-05-03 | 中兴通讯股份有限公司 | Fairing and rectification control method |
| CN112421966A (en) * | 2019-08-22 | 2021-02-26 | 南京南瑞继保电气有限公司 | Solid-state transformer |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103516230B (en) | Many level that bi-directional current controls balance solid-state transformer and its implementation mutually | |
| CN203491898U (en) | Bidirectional tide-controlled modularized multi-level mutually-balanced solid-state transformer | |
| CN204391761U (en) | Flexible medium-voltage direct-current power distribution system | |
| CN103956911A (en) | Modularized H-bridge cascade multilevel mutual-balance power electronic transformer | |
| CN203827197U (en) | Modular H bridge cascaded multilevel mutually-balanced electric power electronic transformer | |
| CN102075096B (en) | Fault tolerance design-based high-power electronic transformer | |
| CN103731035A (en) | DC-DC converter based on modular multi-level converter topological structure | |
| CN106533189A (en) | Power electronic transformer and control method thereof | |
| CN103269171A (en) | Large-power cascading diode H bridge unit power factor rectifier | |
| CN103973121A (en) | Single-phase power electronic transformer | |
| CN104638940A (en) | Modular multi-level power electronic transformer based on cascading | |
| CN102223099A (en) | Adaptive three-phase balanced control cascaded three-phase bridge converter | |
| CN102055348A (en) | Voltage reducing power electronic transformer for distribution network | |
| CN105245119A (en) | Hybrid modular multilevel converter-based topology structure and deicing device | |
| CN111682787A (en) | Single-stage three-phase AC/DC converter based on isolation converter module and method | |
| CN103715930A (en) | Method for increasing capacity of flexible direct-current power transmission system and apparatus thereof | |
| CN202586797U (en) | Five-level variable-current topological structure with bidirectional power switches and application thereof | |
| CN104836463B (en) | Mixing transformation system based on three-phase PWM rectification Yu multiple-unit uncontrollable rectifier | |
| CN104993713A (en) | Control method for double PWM solid-state transformer | |
| CN104242341A (en) | Direct-drive wind power conversion structure based on MMC and bipolar direct-current transmission structure | |
| CN106031011A (en) | Modular multilevel converter leg with flat-top PWM modulation, converter and hybrid converter topologies | |
| CN102664546A (en) | Five-level current transformation topological structure with bi-directional power switch and applications thereof | |
| WO2012010055A1 (en) | Topology for modular multilevel converter-based transformerless inductance energy-saving | |
| CN112653149A (en) | High-power electric energy router suitable for low-voltage distribution network | |
| CN107800299A (en) | Modularized dc transformation system and its control method based on MMC high frequency conversions |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140319 |