CN104539173A - Transformer circuit - Google Patents
Transformer circuit Download PDFInfo
- Publication number
- CN104539173A CN104539173A CN201510037100.6A CN201510037100A CN104539173A CN 104539173 A CN104539173 A CN 104539173A CN 201510037100 A CN201510037100 A CN 201510037100A CN 104539173 A CN104539173 A CN 104539173A
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- CN
- China
- Prior art keywords
- pwm
- net side
- converter
- transformer
- winding
- 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.)
- Pending
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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
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M5/4585—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only having a rectifier with controlled elements
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac 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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
- H02M7/487—Neutral point clamped inverters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/493—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode the static converters being arranged for operation in parallel
Abstract
The invention is applicable to the technical field of power electronics and provides a transformer circuit. The transformer circuit comprises a winding transformer, M PWM network-site transformers connected with the winding transformer and a three-level machine-side transformer, wherein M is an even number; the M PWM network-site transformers are connected in series; and after connection in series, the middle points are connected with the middle point of the three-level machine-side transformer. The transformer circuit provided by the invention has the advantages that the problem that the potential at the middle point of the traditional three-level transformer is not balanced can be solved and the cost of the whole transformer is reduced.
Description
Technical field
The invention belongs to electric and electronic technical field, particularly relate to a kind of converter circuit.
Background technology
Middle pressure Multilevel Inverters has been widely used in the every field such as metallurgy, papermaking, traffic, wind power generation at present.Wherein, diode neutral-point-clamped type Multilevel Inverters, due to the topological structure of maturation and good effect, has become the type that in Multilevel Inverters, investigation and application is maximum.As shown in Figure 1, the topological structure of AC-DC-AC that often adopts of common diode NPC three-level converter.This topological input side connects network transformer, transforms to DC side through three-level current transformer, and outlet side connects motor, controls motor.Net side groundwork is the stability and balance maintaining positive and negative busbar voltage; Pusher side mainly controls motor.
Put in the application process of clamper type three-level current transformer in the diode, occurred a lot of problem to be solved.Mid-point voltage imbalance problem compares one of distinct issues exactly.Midpoint potential imbalance will bring the distortion of pusher side current transformer output voltage waveforms, level number reduces, converter switches device bears the harm such as voltage is unbalanced, electric capacity service life reduction.In addition, net side converter is directly connected on high-voltage fence, and all switching devices must be all high tension apparatus, the high application that also limit three-level current transformer of device cost.
Summary of the invention
The object of the embodiment of the present invention is to provide a kind of by converter circuit, is intended to solve the unbalanced problem of traditional three-level current transformer midpoint potential.
The embodiment of the present invention is achieved in that a kind of converter circuit, and described circuit comprises winding transformer, M the PWM net side converter be connected with winding transformer and a three level pusher side current transformer, and described M is even number; Wherein, described M PWM net side converter is connected in series, and the mid point after series winding connects is connected with the mid point of described three level pusher side current transformer.
Further, described PWM net side converter comprises the net side filter, PWM rectifier and the bus capacitor that connect successively.
Further, described PWM net side converter comprises the PWM rectifier and bus capacitor that connect successively.
Further, described bus capacitor is an electric capacity or by multiple capacitances in series with or compose in parallel.
Further, described winding transformer is M, respectively with described M PWM net side converter one_to_one corresponding.
Further, described winding transformer is one, comprises M vice-side winding, a described M vice-side winding and described M PWM net side converter one_to_one corresponding.
Further, described net side filter is L structure, LC structure or LCL structure.
Each bus capacitor is controlling separately by the embodiment of the present invention, and mid point level can be made to keep balance.Further, net side converter adopts two level current transformers, and under it is operated in low-voltage condition, the switching device of employing is low-voltage device, eliminates multiple high pressure clamp diode, greatly reduces complete machine cost.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the converter circuit of prior art;
Fig. 2 is the structure chart of the converter circuit that the embodiment of the present invention provides;
Fig. 3 is another structure chart of the converter circuit that the embodiment of the present invention provides.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
The embodiment of the present invention proposes a kind of converter circuit.As shown in Figure 2, it is even number that the circuit of the embodiment of the present invention comprises winding transformer 10, M the PWM net side converter (being illustrated as PWM net side converter 50 and a 2nd PWM net side converter 51) be connected with winding transformer 10 and a first three level pusher side current transformer 40, described M; Wherein, described M PWM net side converter is connected in series, and the mid point after series winding connects is connected with the mid point of described first three level pusher side current transformer 40.
Each PWM net side converter above-mentioned comprises the net side filter, PWM rectifier and the bus capacitor that connect successively or the PWM rectifier connected successively and bus capacitor.As shown in Figure 2, a PWM net side converter 50 comprises the first net side filter 20, first PWM rectifier 30 and the bus capacitor C3 connected successively; 2nd PWM net side converter 51 comprises the second net side filter 21, second PWM rectifier 31 and the bus capacitor C4 connected successively.The bus capacitor of the embodiment of the present invention one can be an electric capacity or by multiple capacitances in series with or compose in parallel.
Wherein, M net side filter and M PWM rectifier, a M bus capacitor one_to_one corresponding, each net side filter is connected with corresponding PWM rectifier, and the PWM rectifier of this correspondence and corresponding bus capacitor parallel connection (illustrate the first net side filter 20, first PWM rectifier 30, bus capacitor C3 connects successively; Second net side filter 21, second PWM rectifier 31, bus capacitor C4 connect successively); M bus capacitor is contacted (diagram bus capacitor C3 and C4 series winding) successively, and the mid point after series winding is connected with the mid point of pusher side current transformer.
Preferably, the winding transformer of this circuit can be M, and respectively with M PWM net side converter one_to_one corresponding, or winding transformer is one, comprises M vice-side winding, and M vice-side winding and M PWM net side converter one_to_one corresponding, structure shown in Fig. 2 is the latter.
Net side filter can adopt the topological structures such as traditional LC, LCL, L, also directly can use the secondary leakage inductance of winding transformer as filter circuit.As can be seen from Fig. 2, the negative pole of a PWM net side converter 50 bus capacitor C3 is connected with the positive pole of the 2nd PWM net side converter 51 bus capacitor C4.The voltage of the one PWM net side converter 50 control bus electric capacity C3, the voltage of the 2nd PWM net side converter 51 control bus electric capacity C4.First three level pusher side current transformer 40 also can keep traditional diode clamp type three-level current transformer topological structure or other three-level current transformer topological structure (such as: leap capacitor type three-level current transformer topological structure).
For further illustrating the circuit of the embodiment of the present invention, the embodiment of the present invention is in conjunction with the operation principle of the circuit of the application detailed description embodiment of the present invention of 1140V wind generator system, and shown in composition graphs 1, the structure of prior art is analyzed.For Fig. 1, to press the electrical network of three-level current transformer, wind energy turbine set 35kV in traditional diode clamp type, the box type transformer in Fig. 1, be 1140V voltage by 35kV voltage transformation, be then connected to net side three-level current transformer by net side filter.The total working voltage of bus capacitor C1 and C2 is 1700V.Net side converter can well control bus total voltage, but C1 and C2 voltage balance control is the difficult point of this topology, in addition, under net side converter is operated in and exchanges 1140V voltage, all switching devices must be all corresponding high tension apparatus, considerably increase the cost of this structure.As shown in Figure 2, be the electrical network of wind energy turbine set 35kV equally, become through winding transformer case, each winding is transformed to the low pressure of 550V.Each winding is connected to the first PWM rectifier 30, second PWM rectifier 31 respectively by the first net side filter 20, second net side filter 21.Bus capacitor C3 and C4 is connected respectively to the first PWM rectifier 30 and the second PWM rectifier 31.The negative pole of bus capacitor C3 is connected to the positive pole of bus capacitor C4, forms the mid point of the first three level pusher side current transformer 40.The bus operating voltage of bus capacitor C3 and bus capacitor C4 is respectively 850V.Because bus capacitor C3 and bus capacitor C4 is controlled by independently PWM rectifier respectively, there is not electric voltage equalization problem.In this topology, net side switching device all can adopt the low-voltage device of 550V, does not have 6 high pressure clamp diodes simultaneously.The topology of the first three level pusher side current transformer 40 can be identical with conventional diode clamping type three-level current transformer.
As shown in Figure 3, this circuit comprises winding transformer 11,4 the PWM net side converters (the 3rd PWM net side converter the 52, the 4th PWM net side converter the 53, the 5th PWM net side converter the 54, the 6th PWM net side converter 55) be connected with winding transformer 11 and a second three level pusher side current transformer 41.Wherein, the 3rd PWM net side converter the 52, the 4th PWM net side converter the 53, the 5th PWM net side converter the 54, the 6th PWM net side converter 55 is connected in series, and the mid point after series winding connects is connected with the mid point of the second three level pusher side current transformer 41.
Wherein, the 3rd PWM net side converter 52 comprises the 3rd net side filter 22, the 3rd PWM rectifier 32 and the bus capacitor C5 that connect successively; 4th PWM net side converter 53 comprises the 4th net side filter 23, the 4th PWM rectifier 33 and the bus capacitor C6 that connect successively; 5th PWM net side converter 54 comprises the 5th net side filter 24, the 5th PWM rectifier 34 and the bus capacitor C7 that connect successively; 6th PWM net side converter 54 comprises the 6th net side filter 25, the 6th PWM rectifier 35 and the bus capacitor C8 that connect successively.The tie point of bus capacitor C6 and C7 is the mid point of the second three level pusher side current transformer 41.The voltage of the 3rd PWM net side converter 52 control bus electric capacity C5, the voltage of the 4th PWM net side converter 53 control bus electric capacity C6, the voltage of the 5th PWM net side converter 54 control bus electric capacity C7, the voltage of the 6th PWM net side converter 55 control bus electric capacity C8, realizes the balance of mid point level.
Each bus capacitor is controlling separately by the embodiment of the present invention, and mid point level can be made to keep balance.Further, net side converter adopts two level current transformers, and under it is operated in low-voltage condition, the switching device of employing is low-voltage device, eliminates multiple transformation clamp diode, has greatly saved complete machine cost.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. a converter circuit, is characterized in that, described circuit comprises winding transformer, M the PWM net side converter be connected with winding transformer and a three level pusher side current transformer, and described M is even number; Wherein, described M PWM net side converter is connected in series, and the mid point that series winding connects is connected with the mid point of described three level pusher side current transformer.
2. converter circuit as claimed in claim 1, it is characterized in that, described PWM net side converter comprises the net side filter, PWM rectifier and the bus capacitor that connect successively.
3. converter circuit as claimed in claim 1, it is characterized in that, described PWM net side converter comprises the PWM rectifier and bus capacitor that connect successively.
4. the converter circuit according to any one of Claims 2 or 3, is characterized in that, described bus capacitor is an electric capacity or by multiple capacitances in series with or compose in parallel.
5. the converter circuit according to any one of Claims 2 or 3, is characterized in that, described winding transformer is M, respectively with described M PWM net side converter one_to_one corresponding.
6. the converter circuit according to any one of Claims 2 or 3, is characterized in that, described winding transformer is one, comprises M vice-side winding, a described M vice-side winding and described M PWM net side converter one_to_one corresponding.
7. converter circuit as claimed in claim 2, it is characterized in that, described net side filter is L structure, LC structure or LCL structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510037100.6A CN104539173A (en) | 2015-01-23 | 2015-01-23 | Transformer circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510037100.6A CN104539173A (en) | 2015-01-23 | 2015-01-23 | Transformer circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104539173A true CN104539173A (en) | 2015-04-22 |
Family
ID=52854660
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510037100.6A Pending CN104539173A (en) | 2015-01-23 | 2015-01-23 | Transformer circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104539173A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106374771A (en) * | 2015-07-22 | 2017-02-01 | 利思电气（上海）有限公司 | Active inversion circuit for pole-mounted power active filtering apparatus |
| CN113799663A (en) * | 2021-11-19 | 2021-12-17 | 西南交通大学 | Power supply transmission system of bullet train, alternating current, direct current and alternating current traction converter and control method of alternating current, direct current and alternating current traction converter |
| WO2023087974A1 (en) * | 2021-11-19 | 2023-05-25 | 成都尚华电气有限公司 | Single three-phase compatible alternating-current/direct-current/alternating-current traction converter, and high-speed train power supply and transmission system |
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| WO2000077917A2 (en) * | 1999-06-14 | 2000-12-21 | Siemens Aktiengesellschaft | Indirect voltage converter |
| CN1599233A (en) * | 2004-08-20 | 2005-03-23 | 清华大学 | Variable frequency driving device of 3KV-10KV middle-high voltage multi-level three-phase AC motor |
| CN103066877A (en) * | 2013-01-23 | 2013-04-24 | 山东大学 | High-frequency isolation type inverter for preventing three-phase load unbalance |
| CN103888004A (en) * | 2014-04-08 | 2014-06-25 | 青岛威控电气有限公司 | Single-phase PWM rectifier for railway AC/DC/AC standby power supply |
| CN104104236A (en) * | 2013-04-10 | 2014-10-15 | Ls产电株式会社 | Multilevel inverter |
| CN204046484U (en) * | 2014-09-03 | 2014-12-24 | 唐山开诚电控设备集团有限公司 | 1600kW/3300V series connection 12 pulsation power supply tri-level variable frequency speed control device |
| CN204376727U (en) * | 2015-01-23 | 2015-06-03 | 深圳市禾望电气股份有限公司 | Converter circuit |
-
2015
- 2015-01-23 CN CN201510037100.6A patent/CN104539173A/en active Pending
Patent Citations (7)
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| WO2000077917A2 (en) * | 1999-06-14 | 2000-12-21 | Siemens Aktiengesellschaft | Indirect voltage converter |
| CN1599233A (en) * | 2004-08-20 | 2005-03-23 | 清华大学 | Variable frequency driving device of 3KV-10KV middle-high voltage multi-level three-phase AC motor |
| CN103066877A (en) * | 2013-01-23 | 2013-04-24 | 山东大学 | High-frequency isolation type inverter for preventing three-phase load unbalance |
| CN104104236A (en) * | 2013-04-10 | 2014-10-15 | Ls产电株式会社 | Multilevel inverter |
| CN103888004A (en) * | 2014-04-08 | 2014-06-25 | 青岛威控电气有限公司 | Single-phase PWM rectifier for railway AC/DC/AC standby power supply |
| CN204046484U (en) * | 2014-09-03 | 2014-12-24 | 唐山开诚电控设备集团有限公司 | 1600kW/3300V series connection 12 pulsation power supply tri-level variable frequency speed control device |
| CN204376727U (en) * | 2015-01-23 | 2015-06-03 | 深圳市禾望电气股份有限公司 | Converter circuit |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106374771A (en) * | 2015-07-22 | 2017-02-01 | 利思电气（上海）有限公司 | Active inversion circuit for pole-mounted power active filtering apparatus |
| CN113799663A (en) * | 2021-11-19 | 2021-12-17 | 西南交通大学 | Power supply transmission system of bullet train, alternating current, direct current and alternating current traction converter and control method of alternating current, direct current and alternating current traction converter |
| CN113799663B (en) * | 2021-11-19 | 2022-03-04 | 西南交通大学 | Power supply transmission system of bullet train, alternating current, direct current and alternating current traction converter and control method of alternating current, direct current and alternating current traction converter |
| WO2023087974A1 (en) * | 2021-11-19 | 2023-05-25 | 成都尚华电气有限公司 | Single three-phase compatible alternating-current/direct-current/alternating-current traction converter, and high-speed train power supply and transmission system |
| WO2023088302A1 (en) * | 2021-11-19 | 2023-05-25 | 西南交通大学 | Power car power supply transmission system, ac-dc-ac traction converter, and control methods thereof |
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Address after: 518055 Guangdong city of Shenzhen province Nanshan District Xili town village official Liuzhou Industrial Zone No. 5 Building second layer 1-3 Applicant after: Shenzhen's standing grain hopes electric limited company Address before: 518055 Guangdong city of Shenzhen province Nanshan District Xili Town, Dragon Village Second Industrial District 5 Building 5 floor Applicant before: Shenzhen's standing grain hopes electric limited company |
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Application publication date: 20150422 |