CN2583873Y - Medium-high-voltage electric power converter - Google Patents
Medium-high-voltage electric power converter Download PDFInfo
- Publication number
- CN2583873Y CN2583873Y CN 02284194 CN02284194U CN2583873Y CN 2583873 Y CN2583873 Y CN 2583873Y CN 02284194 CN02284194 CN 02284194 CN 02284194 U CN02284194 U CN 02284194U CN 2583873 Y CN2583873 Y CN 2583873Y
- Authority
- CN
- China
- Prior art keywords
- output
- input
- series
- converting
- power conversion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Dc-Dc Converters (AREA)
Abstract
The utility model relates to a medium-high-voltage electric power converter, which comprises an input converting grade, an output converting grade and a medium isolation converting grade composed of a plurality of high frequency transformers, wherein, the input converting grade and the output converting grade have symmetric and identical structures (formed by connecting in series power converting modules with multiple-grade identical power); the output of each power converting module is coupled to the output converting grade through the high frequency transformers. The utility model utilizes the electric position superposing principle to realize the application of electronic devices with low voltage electric force in a high voltage system. A static electric energy converting device is designed through the medium alternate-direct-alternate converting technology and the medium coupling of a high frequency transformer. Thus, alternate current which is input is converted into voltage of which the amplitude valve and the frequency can be continuously adjusted for outputting so as to realize the balance of compulsory voltage between the components and to reduce the harmonic content in output waves.
Description
Technical field
The utility model relates to a kind of transformation of electrical energy technology of electric power system, relates to a kind of mesohigh power-converting device or rather.
Background technology
The transformation of electrical energy technology has a very important role in defeated, the distribution network of electric power system.Along with developing rapidly of power electronic technology, adopt power electronic device and Semiconductor Converting Technology to realize that the energy conversion in the electric power system becomes more and more general.Yet, being subjected to the restriction of the withstand voltage level and the capacity of device itself, the Technics of Power Electronic Conversion technology is very limited in the mesohigh application on power system.Although in recent years, the research of high-voltage and high-power power electronic device has obtained remarkable progress, and its withstand voltage level and capacity are still very limited with respect to the mesohigh electric power system, can not satisfy the requirement of system voltage grade.On the other hand, the high-voltage and high-power power electronic device cost is very high, and its switching frequency is lower, makes its application in the mesohigh system also be difficult to promote and comes.
The topological structure of the electric electronic current change technology of present commonplace employing mainly contains two kinds: a kind of is the integral type mapping mode, being about to input integrally changes, under the integral type mapping mode, power electronic power device will bear high-tension effect, because the restriction of single power device withstand voltage level, in order to satisfy voltage and capacity requirement, many of needs carry out connection in series-parallel and can be applied in the high-voltage electric power system, to bring the voltage and current equalization problem between the connection in series-parallel device thus, series-parallel device is many more, and this equalization problem is also big more.Another kind is that to be similar to the patent No. be the mapping mode of utilizing the current potential principle of stacking to constitute as shown in Figure 1 that proposes in 95119585.9 the patent to topological structure.Under this topological structure, adopt the low tension switch device to carry out energy conversion, satisfy the requirement of high voltage appearance grade again by the current potential stack.For the cutting current potential, be equipped with a power transformer at input side and be absolutely necessary with an elementary winding, a plurality of secondary winding.Therefore, volume and the environmental issue under this structure is more outstanding.
Summary of the invention
The purpose of this utility model is to provide a kind of mesohigh power-converting device that can overcome above-mentioned defective, the utility model can improve the performance of transformation of electrical energy device, save bulky input transformer, make the converter components modularization simultaneously, reduce the manufacturing cost and the pollution that reduces environment of device.For realizing above-mentioned utility model purpose, a kind of mesohigh power-converting device, comprise input unit, three parts of intermediate conversion unit and output unit, it is characterized in that: described input unit is the input conversion stage, output unit is the output transform level, both symmetrical configuration are also identical, the Power Conversion module identical by the N level structure is in series, the Power Conversion module is blow-up-straight-friendship Power Conversion unit of being made up of the switching device of eight band inverse parallel fly-wheel diodes, the electric capacity mid point of two series connection of Power Conversion unit joins with a mid point that inputs or outputs the corresponding series capacitor of level, and continuous with the mid point of the elementary winding of corresponding high frequency transformer or secondary winding; At the input conversion stage, between two end lines of the input of each Power Conversion module and be connected to capacitor connected in series, and respectively be in series with reactor, in the output transform level, between two end lines of the output of each Power Conversion module and be connected to capacitor connected in series, also respectively be serially connected with reactor; Described intermediate conversion unit is an intermediate isolating transformation level, and it is made of N high frequency transformer, and the output of each Power Conversion module all is coupled to the output transform level via high frequency transformer.
The utility model utilizes the current potential principle of stacking to realize adopting the application of low-voltage power electronic device in the mesohigh system.The friendship by the centre-straight-alternation changes technology and the coupling of middle high frequency transformer, designs a kind of transformation of electrical energy device of static state, and the alternating current of importing is transformed to amplitude, the continuously adjustable voltage output of frequency.And can realize coercive voltage equilibrium and the harmonic components that reduces in the output waveform between device.Particularly, the utlity model has following characteristics:
(1) the input AC electricity is converted to amplitude, the continuously adjustable alternating current output of frequency.
(2) utilize the current potential principle of stacking, realized that the employing low voltage power devices finishes transformation of electrical energy in the mesohigh electric power system.
(3) adopt low-voltage device, can improve the switching frequency of device greatly, thus make in the conversion process and the output of final waveform in have very little harmonic components.
(4) do not need to use bulky power transformer, reduced the volume and the cost of whole device, and device is to the pollution of environment.
(5) can realize that power bi-directional flows, and makes the range of application of device more extensive.
(6) under this topological structure, can reduce output harmonic wave by Optimal Control Strategy as far as possible.
Embodiment
Basic principle of the present utility model is that employing high-power electric and electronic Semiconductor Converting Technology realizes the transformation of electrical energy in the electric power system.Shown in Figure 2 is a kind of principle assumption diagram of mesohigh power-converting device of the present utility model, may be partitioned into input conversion stage 1, intermediate isolating transformation level 2 and 3 three parts of output transform level substantially:
(1) the input conversion stage is in series by the identical Power Conversion module 4 of N level structure, and the progression of required serial module structure is determined jointly by the voltage withstand class of electric pressure in the real application systems and module device.
(2) output of each Power Conversion module all is coupled to the output transform level via a high frequency transformer 7.
(3) symmetry of the structure of output transform level and input conversion stage is in series at output by the N level Power Conversion module identical with importing the conversion stage structure 4 '.
In conjunction with topological structure shown in Figure 2, structure of the present utility model is described in detail.
At the input conversion stage, between two end lines of the input of each Power Conversion module and connect two identical capacitor connected in series 5 to realize the uniform distribution of input voltage between at different levels, the identical reactor 6 of respectively connecting on two end lines simultaneously strobes.
In the output transform side, between two end lines of the output of each Power Conversion module also and connect two identical capacitor connected in series 5 ' and be connected in series reactor 6 '.
The blow-up that each Power Conversion module is made up of the switching device of eight band inverse parallel fly-wheel diodes-straight-friendship Power Conversion unit, the mid point of the series capacitor that the electric capacity mid point of two series connection of Power Conversion unit is corresponding with inputing or outputing level joins, and link to each other with the elementary winding of corresponding high frequency transformer or the mid point of secondary winding, be beneficial to realize better all pressures of device.
In the utility model, the alternating current of input by inversion unit modulation becoming high frequency square wave, is coupled to output stage through high frequency transformer behind controlled rectification circuit.Here, high frequency transformer designs by the frequency of high-frequency square-wave signal.Its effect mainly be import, output potential is isolated and transformer action.Because transformer fe core volume and operating frequency are inversely proportional to, so the volume and weight of high frequency transformer is all very little.The quantity of high frequency transformer is identical with the quantity that inputs or outputs grade serial module structure.The mid point of former side's winding of each high frequency transformer all has the mid point of two electric capacity of the input of a tap and the corresponding conversion module of input stage to join, and the mid point of its secondary side's winding all has the mid point of two electric capacity of the output of tap and the corresponding conversion module of output stage to join.
Below the utility model is specifically implemented for two examples.
Example 1:2500kW, 10kV high-power high voltage frequency converter
Input needs 15 grades of Power Conversion modules to connect, and each module is made up of two unit IGBT modules and two dc-link electric capacity of connecting of four 1200V/400A.By input stage, exchange the high-frequency signal that input is modulated into 5～10kHz, the process no-load voltage ratio is that 1: 1.1 high frequency transformer is coupled to output stage, is transformed into the output that exchanges of required frequency and amplitude again by output level module.Output stage also is composed in series by 15 grades of modules identical with input stage.Because this structure is single-phase form, so will adopt the converters of this structure of three covers to be connected into Y type or D type to finish the conversion of three-phase alternating current.
The interchange input of 10kV is carried on 15 friendships that are connected in series-straight-friendship Power Conversion module, realizes the cutting of voltage, thereby makes every cover power model all only bear low voltage.And the input AC electricity is converted into high-frequency alternating currents in the middle of 15 tunnel, for the loss of voltage that the loss of compensating circuit own produces, will be that 1: 1.1 high frequency transformer boosts through no-load voltage ratio.15 road high-frequency alternating currents after boosting through friendship-straight-hand over controlled conversion after, in the outlet side stack, and hand over the orthogonal translation circuit by control, realize frequency conversion.
Example 2:2000kVA, the transformer of 35kV/10kV
Input stage needs 15 grades of Power Conversion modules to connect, and each module is made up of two unit IGBT modules and two dc-link electric capacity of connecting of four 3300V/100A.By input stage, exchange the high-frequency signal that input is modulated into 5～10kHz, be coupled to output stage through high frequency transformer, be transformed into the output that exchanges of required frequency and amplitude again by output level module.Output stage also is composed in series by 15 grades of Power Conversion modules, and each module is made up of two unit IGBT modules and two dc-link electric capacity of connecting of four 1200V/400A.Because this structure is single-phase form, so will adopt the converters of this structure of three covers to be connected into Y type or D type to finish the conversion of three-phase alternating current.
The interchange input of 35kV is carried on 15 friendships that are connected in series-straight-friendship Power Conversion module, realizes the cutting of voltage, thereby makes every cover power model all only bear low voltage.And the input AC electricity is converted into high-frequency alternating currents in the middle of 15 tunnel, will carry out step-down through the step-down high frequency transformer of suitable no-load voltage ratio.After 15 road high-frequency alternating currents process friendship after the step-down-straight-controlled conversion of friendship, obtain the 10kV alternating current in the outlet side stack.
The utility model is not limited to the content of the explanation of above-mentioned embodiment, and persons skilled in the art can be released more execution mode from above-mentioned explanation.
Claims (3)
1. mesohigh power-converting device, comprise input unit, three parts of intermediate conversion unit and output unit, it is characterized in that: described input unit is input conversion stage (1), output unit is output transform level (3), both symmetrical configuration are also identical, by the identical Power Conversion module (4 of N level structure, 4 ') be in series, Power Conversion module (4) is blow-up-straight-friendship Power Conversion unit of being made up of the switching device of eight band inverse parallel fly-wheel diodes, the electric capacity mid point of two series connection of Power Conversion unit joins with a mid point that inputs or outputs the corresponding series capacitor of level, and continuous with the mid point of the elementary winding of corresponding high frequency transformer or secondary winding; At the input conversion stage, between two end lines of the input of each Power Conversion module (4) and be connected to capacitor connected in series (5), and respectively be in series with reactor (6), in the output transform level, between two end lines of the output of each Power Conversion module (4 ') and be connected to capacitor connected in series (5 '), also respectively be serially connected with reactor (6 '); Described intermediate conversion unit is an intermediate isolating transformation level (2), and it is made of N high frequency transformer (7), and the output of each Power Conversion module (4) all is coupled to output transform level (3) via high frequency transformer (7).
2, device according to claim 1, it is characterized in that: at the input conversion stage, between two end lines of the input of each Power Conversion module (4) and the capacitor connected in series (5) that connects be the capacitor that capacitance equates, the reactor of series connection (6) is the equal reactor of inductance value.
3, device according to claim 1 and 2, it is characterized in that: in the output transform level, between two end lines of the output of each Power Conversion module (4 ') and the capacitor connected in series (5 ') that connects be the capacitor that capacitance equates, the reactor (6 ') of serial connection is the equal reactor of inductance value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02284194 CN2583873Y (en) | 2002-11-14 | 2002-11-14 | Medium-high-voltage electric power converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02284194 CN2583873Y (en) | 2002-11-14 | 2002-11-14 | Medium-high-voltage electric power converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2583873Y true CN2583873Y (en) | 2003-10-29 |
Family
ID=33745602
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02284194 Expired - Fee Related CN2583873Y (en) | 2002-11-14 | 2002-11-14 | Medium-high-voltage electric power converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2583873Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011054137A1 (en) * | 2009-11-05 | 2011-05-12 | 纽福克斯光电科技（上海）有限公司 | Direct current-alternating current voltage converting circuit |
| CN101740555B (en) * | 2009-12-28 | 2012-07-04 | 中国工程物理研究院流体物理研究所 | Ultrahigh pressure pulse silicon rectifier stack |
| CN102638176A (en) * | 2012-04-12 | 2012-08-15 | 华中科技大学 | Hybrid cascade multilevel electronic power transformer |
-
2002
- 2002-11-14 CN CN 02284194 patent/CN2583873Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011054137A1 (en) * | 2009-11-05 | 2011-05-12 | 纽福克斯光电科技（上海）有限公司 | Direct current-alternating current voltage converting circuit |
| CN101740555B (en) * | 2009-12-28 | 2012-07-04 | 中国工程物理研究院流体物理研究所 | Ultrahigh pressure pulse silicon rectifier stack |
| CN102638176A (en) * | 2012-04-12 | 2012-08-15 | 华中科技大学 | Hybrid cascade multilevel electronic power transformer |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10236685B2 (en) | Power electronic voltage tranforming apparatus with single-phase power electronic transformers | |
| CN101707443B (en) | Novel electric power electric transformer | |
| CN100405727C (en) | PWM combined three level DC converter for zero voltage current switch | |
| CN103036451B (en) | Electronic power transformer | |
| CN103280977A (en) | Isolation type DC/DC (direct current/direct current) converter based on modularized multilevel current converter | |
| Inoue et al. | Design of an isolated bidirectional DC–DC converter with built-in filters for high power density | |
| CN101574935B (en) | Module combined power quality conditioning system for tractive power supply network | |
| CN103715930A (en) | Method for increasing capacity of flexible direct-current power transmission system and apparatus thereof | |
| CN204361913U (en) | A kind of distribution electric power electric transformer | |
| CN101521386A (en) | Traction power supply direct hanging type high voltage comprehensive compensation device | |
| CN101428570B (en) | Direct net suspension mode for implementing homophase traction power supply based on high voltage synthetic compensating gear | |
| CN109980948A (en) | A kind of five port electric power electric transformer of three Coupling Between Phases | |
| CN104600702B (en) | Induction control filtering system for integrated electric reactor and control method of induction control filtering system | |
| CN107546983B (en) | A kind of high-power high no-load voltage ratio modularization two-way DC converter of isolated form | |
| CN104333247B (en) | Using the cascading multiple electrical level of three-terminal switch network is single-phase and three-phase inverter | |
| CN1259767C (en) | Medium and high voltage power conversion method and device | |
| CN111490695A (en) | Single-stage low-voltage stress switch capacitance type multi-level inverter topological structure and level modulation method | |
| CN2583873Y (en) | Medium-high-voltage electric power converter | |
| CN113890122A (en) | Alternating current-direct current multiport power distribution system for office residential area | |
| WO2021253680A1 (en) | Dual active bridge converter and inverter | |
| CN106887952A (en) | A kind of commutator transformer and its implementation that direct current network is accessed for new energy | |
| CN203014686U (en) | An electronic power transformer | |
| CN109802587A (en) | Three level NPC converter system of modularization and control method based on coupling inductance | |
| CN113890383B (en) | Multiport converter topology applied to flexible power distribution network and control method thereof | |
| CN216215929U (en) | Alternating current-direct current multiport power distribution system for office residential area |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |