CN101777842A - Medium voltage frequency conversion power circuit system - Google Patents
Medium voltage frequency conversion power circuit system Download PDFInfo
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- CN101777842A CN101777842A CN 201010130517 CN201010130517A CN101777842A CN 101777842 A CN101777842 A CN 101777842A CN 201010130517 CN201010130517 CN 201010130517 CN 201010130517 A CN201010130517 A CN 201010130517A CN 101777842 A CN101777842 A CN 101777842A
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Abstract
The invention discloses a medium voltage frequency conversion power circuit system, which belongs to the technical field of electric power systems, and comprises a step-down transformer, a converter array and a step-up transformer which are sequentially connected in series, wherein the input end of the step-down transformer is connected with the output end of a three-phase supply of a medium voltage power grid, and the output end of the step-up transformer is a frequency conversion voltage output. The invention reduces the number of three-phase rectifiers and has balanced power, so the output voltage can be further improved, and the system has the advantages of simple integral structure, improved power grid side power factor and more perfect overall performance.
Description
Technical field
What the present invention relates to is the system in a kind of power technology field, specifically is a kind of medium voltage converter power circuit system based on power-balance, plural serial stage inversion.
Background technology
In three-phase medium voltage converter speed governing field, be the concatenated frequency changer and the three-level inverter of voltage source inverter plural serial stage in the converters pattern of usefulness.The former is the high type of height, and ceiling voltage is 10kV, and its prime generally adopts not control rectifier, can certainly adopt three-phase controlled rectifier.The latter is high type, and ceiling voltage only is 3.3kV at present, and prime generally adopts not control rectifier, also can adopt three level controlled rectifiers.The concatenated frequency changer of the high type of height, universal architecture comprises the not step-down transformer of control rectifier, several single-phase voltage source inventers of 3x level, a high voltage input and low-voltage output of several three-phases of 3x level, being characterized as of step-down transformer elementaryly connects three phase windings, secondary for several tortuous three phase windings of 3x level for Y, the basic differential seat angle that tortuous three phase windings connect group is (60 °/progression), it is identical that per three three phase windings connect group, the supporting inverter of rectifier.For convenience of explanation, make that total progression is N, the arbitrarily a progression be n.
The use of concatenated frequency changer for the high type of height has obtained great success, but is not that this power structure is just no problem.Theory analysis finds that with actual the use concatenated frequency changer has following problem: the design of (1) step-down transformer is complicated, shows as secondary tortuous design of Windings complexity, and productivity ratio is lower; (2) rectifier quantity is many; (3) control rectifier laod unbalance not needs big capacity electrochemical capacitor, and this problem is more serious when especially adopting controlled rectifier; (4) the control rectifier input current waveform does not distort, and has additionally increased the capacity of step-down transformer; (4) machine volume is big, efficient is low, cost is high, control is complicated, poor-performing; (5) more high voltage output needs more inverter series connection progression.Need this concatenated frequency changer mechanism is changed for this reason, design novel frequency changer, bring outstanding property.
Through the retrieval of prior art is found, Chinese patent application number 02104140.7, an open day 2003-4-30 has put down in writing this a kind of " no-harmonic wave pollution high voltage large power frequency converter "; In addition, Jiang Youhua also discloses the middle pressure of cascaded multiple (being plural serial stage) and three level, the application that high voltage converter has all obtained certain limit at " research of high-power Asynchronous Motor Driving blower fan, load of the pumps speed adjusting technique " (doctorate paper .2006 of Shanghai University 02 month), brought into play frequency conversion voltage adjusting speed governing, energy-saving and cost-reducing effect.The means that realize the high-pressure frequency-conversion power supply in the above-mentioned technology mainly comprise following 4 points: (1) traditional step-down transformer is the high scheme of height of multipleization of control rectifier inverter cascade not; (2) based on the high scheme of three-level voltage source inverter of diode clamping; (3) based on the high scheme of the clamped three-level voltage source inverter of electric capacity; (4) the high scheme of height of traditional step-down transformer matrix converter cascaded multiple; (5) the device two-level inverter of directly connecting.
By analysis, all there is following defective in prior art: first kind: owing to do not control the rectifier bridge laod unbalance, make DC loop storage capacitor size increase, input current waveform is asymmetric, less stable.The secondary of step-down transformer must be designed to multiple connection group, and as Y type, meander configuration etc., design is complicated, inefficiency.The increase that obtains simple dependence progression of boosting is finished, and makes system huge, and the control difficulty increases progressively.Second kind: structure is comparatively simple, but control is still complicated, has the direct voltage imbalance problem, support that power bracket is narrower, support that output voltage range is not wide, the secondary of step-down transformer also must be designed to many Y type and triangular form etc., design some complexity, inefficiency.The third: because structure is complicated, the controllability complexity is not applied.The 4th kind: because the laod unbalance of matrix converter makes input current waveform distort, original input current waveform was just relatively poor, and input current waveform is asymmetric, less stable.The secondary of step-down transformer must be designed to multiple connection group, and as Y type, meander configuration etc., design is complicated, inefficiency.The increase that obtains simple dependence progression of boosting is finished, and makes system huge, and the control difficulty increases progressively.
Summary of the invention
The present invention is directed to the prior art above shortcomings, a kind of medium voltage converter power circuit system is provided, be able to further lifting by simplification step-down transformer, the minimizing of three-phase rectifier quantity and power-balance, output voltage, it is simple to have general structure, net side power-factor improvement, the more perfect advantage of whole overall performance.
The present invention is achieved by the following technical solutions, the present invention includes: Chuan Lian step-down transformer, transducer array and step-up transformer successively, the input of step-down transformer is connected with the three-phase power output end of medium voltage network, and the output of step-up transformer is the output of frequency conversion voltage;
Wherein:
Described step-down transformer is a step-down transformer, comprise a three-phase primary windings and N three-phase secondary winding, wherein: three-phase primary windings links to each other with the three-phase power output end of medium voltage network respectively, and the input of the converter subelement in three-phase secondary winding and the transducer array links to each other;
Described transducer array comprises: N converter subelement in parallel, and the input of this converter subelement is connected with the corresponding three-phase secondary winding of step-down transformer, and its output links to each other with the corresponding three-phase transformer of step-up transformer respectively;
Described step-up transformer comprises: N three-phase transformer, wherein: the ac input end of each three-phase transformer respectively with the corresponding connection of ac output end of correspondent transform device subelement, the output in parallel of each three-phase transformer is connected serially to the input in parallel of next three-phase transformer successively, and the output in parallel of last three-phase transformer is the output of frequency conversion voltage.
Described converter subelement comprises: 1 three-phase controlled rectifier and 3 single-phase inverters, wherein: the ac input end of three-phase controlled rectifier is connected with the three-phase secondary winding of step-down transformer, the dc output end of three-phase controlled rectifier links to each other with the direct-flow input end of 3 single-phase inverters respectively, and 3 pairs of ac output ends of 3 single-phase inverters are connected with the input of the corresponding three-phase transformer of step-up transformer respectively.
Described three-phase controlled rectifier is the low-voltage power electronic converter, input low pressure power frequency ac voltage, output low-voltage dc voltage.
Described single-phase inverter is the low-voltage power electronic converter, input low-voltage dc voltage, output low-voltage variable frequency alternating voltage.
Described step-up transformer is the low-voltage power transformer, input low-voltage variable frequency alternating voltage, output low-voltage variable frequency alternating voltage.
In sum, step-down transformer is responsible for one group of three-phase high-voltage power frequency ac voltage is become 3N group low pressure power frequency ac voltage, and primary current is a sinusoidal waveform, and each secondary current is a sinusoidal waveform, for Y-Y connects, and work simplification, power environment protection, efficient improves.Controlled rectifier input sinusoidal voltage, output dc voltage produces the input simple sinusoidal alternating current.The single-phase inverter input direct voltage, output variable voltage variable frequency voltage.The variable voltage variable frequency voltage that step-up transformer is finished inversion output further boosts, and enlarges output voltage range, and plays the electrical isolation effect, can certainly be made into no-load voltage ratio and be 1 transformer.
The objective of the invention is with three-phase controlled rectifier bearing power balance is starting point, designed the plural serial stage medium voltage converter power circuit system that step-down transformer simplification, the minimizing of three-phase controlled rectifier quantity, step-up transformer further boost, thereby have features such as novel, highly versatile, and general structure is simple, advantages such as net side power-factor improvement, whole overall performance.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Fig. 2 is the step-down transformer schematic diagram.
Fig. 3 is the transducer array schematic diagram.
Fig. 4 is the step-up transformer schematic diagram.
Embodiment
Below embodiments of the invention are elaborated, present embodiment is being to implement under the prerequisite with the technical solution of the present invention, provided detailed execution mode and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
As shown in Figure 1, present embodiment comprises: Chuan Lian step-down transformer 1, transducer array 2 and step-up transformer 3 successively, wherein:
As shown in Figures 2 and 3, described step-down transformer 1 comprises: three-phase primary windings PR1 and N three-phase secondary winding SE1 ..., SEN, wherein: three-phase primary windings PR1 links to each other with the three-phase power output end of medium voltage network respectively, i three-phase secondary winding SEi links to each other with the three-phase input end of i three-phase controlled rectifier RECi of transducer array, wherein: i wherein is 1 to N natural constant, and N is that progression and value are natural constant;
Shown in Fig. 2-4, described transducer array comprises: N three-phase rectifier REC1 ..., RECN and N single-phase inverter array, each single-phase inverter array comprises: the first single-phase inverter INV1i of three parallel connections, the second single-phase inverter INV2i and the 3rd single-phase inverter INV3i; Wherein: the three-phase alternating current input of i three-phase controlled rectifier RECi is corresponding continuous with i three-phase secondary winding in the step-down transformer, the dc output end of this three-phase controlled rectifier RECi is connected with the input of i single-phase inverter array, and the first single-phase inverter INV1i, the second single-phase inverter INV2i in i single-phase inverter array are connected with the three-phase transformer of step-up transformer respectively with the 3rd single-phase inverter INV3i;
As shown in Figure 3 and Figure 4, described step-up transformer comprise N three-phase transformer TRUP1 in parallel ..., TRUPN, wherein: corresponding respectively three outputs that are connected to i single-phase inverter array of described transducer array of three inputs of i three-phase transformer TRUPi, three outputs in parallel of this i three-phase transformer TRUPi are connected to three inputs in parallel of i+1 three-phase transformer TRUPi+1, and the output of N three-phase transformer TRUPN is the output of present embodiment system.
In the present embodiment: the three-phase alternating current output voltage is 6kV, medium voltage frequency converter desired output alternating voltage maximum magnitude is 6kV, the step-down transformer primary voltage is 6kV, the step-down transformer secondary voltage is 690V, progression N is 5, three-phase alternating voltage input, the direct voltage output rectifier pattern of various employing controlling technologies such as three-phase controlled rectifier can potential source rectifier, current source rectifier, matrix rectifier, phase controlled rectifier also can be diode control rectifier not.Three-phase inverter can adopt existing three-phase voltage source inverter, and step-up transformer is made into the same pressure transformer of 1 times of transformation, then can satisfy the frequency control requirement of 6kV high-pressure frequency-conversion motor fully.
Claims (6)
1. medium voltage converter power circuit system, comprise: Chuan Lian step-down transformer, transducer array and step-up transformer successively, the input of step-down transformer is connected with the three-phase power output end of medium voltage network, and the output of step-up transformer is the output of frequency conversion voltage, it is characterized in that:
Described step-down transformer is a step-down transformer, comprise a three-phase primary windings and N three-phase secondary winding, wherein: three-phase primary windings links to each other with the three-phase power output end of medium voltage network respectively, and the input of the converter subelement in three-phase secondary winding and the transducer array links to each other;
Described transducer array comprises: N converter subelement in parallel, and the input of this converter subelement is connected with the corresponding three-phase secondary winding of step-down transformer, and its output links to each other with the corresponding three-phase transformer of step-up transformer respectively;
Described step-up transformer comprises: N three-phase transformer, wherein: the ac input end of each three-phase transformer respectively with the corresponding connection of ac output end of correspondent transform device subelement, the output in parallel of each three-phase transformer is connected serially to the input in parallel of next three-phase transformer successively, and the output in parallel of last three-phase transformer is the output of frequency conversion voltage.
2. medium voltage converter power circuit system according to claim 1, it is characterized in that, described converter subelement comprises: 1 three-phase controlled rectifier and 3 single-phase inverters, wherein: the ac input end of three-phase controlled rectifier is connected with the three-phase secondary winding of step-down transformer, the dc output end of three-phase controlled rectifier links to each other with the direct-flow input end of 3 single-phase inverters respectively, and 3 pairs of ac output ends of 3 single-phase inverters are connected with the input of the corresponding three-phase transformer of step-up transformer respectively.
3. medium voltage converter power circuit system according to claim 1 is characterized in that, described three-phase controlled rectifier is the low-voltage power electronic converter, input low pressure power frequency ac voltage, output low-voltage dc voltage.
4. medium voltage converter power circuit system according to claim 1 is characterized in that, described single-phase inverter is the low-voltage power electronic converter, input low-voltage dc voltage, output low-voltage variable frequency alternating voltage.
5. medium voltage converter power circuit system according to claim 1 is characterized in that, described step-up transformer is the low-voltage power transformer, input low-voltage variable frequency alternating voltage, output low-voltage variable frequency alternating voltage.
6. medium voltage converter power circuit system according to claim 1, it is characterized in that, described step-down transformer comprises: a three-phase primary windings (PR1) and N three-phase secondary winding (SE1) ..., (SEN), wherein: three-phase primary windings (PR1) links to each other with the three-phase power output end of medium voltage network respectively, and i three-phase secondary winding (SEi) links to each other with the three-phase input end of i the three-phase controlled rectifier (RECi) of transducer array;
Described transducer array comprises: N three-phase rectifier (REC1) ..., (RECN) and N single-phase inverter array, each single-phase inverter array comprises: first single-phase inverter (INV1i) of three parallel connections, second single-phase inverter (INV2i) and the 3rd single-phase inverter (INV3i); Wherein: the three-phase alternating current input of i three-phase controlled rectifier (RECi) is corresponding continuous with i three-phase secondary winding in the step-down transformer, the dc output end of this three-phase controlled rectifier (RECi) is connected with the input of i single-phase inverter array, and first single-phase inverter (INV1i), second single-phase inverter (INV2i) and the 3rd single-phase inverter (INV3i) in i single-phase inverter array are connected with the three-phase transformer of step-up transformer respectively;
Described step-up transformer comprise N three-phase transformer (TRUP1) in parallel ..., (TRUPN), wherein: corresponding respectively three outputs that are connected to i single-phase inverter array of described transducer array of three inputs of i three-phase transformer (TRUPi), three outputs in parallel of this i three-phase transformer (TRUPi) are connected to three inputs in parallel of i+1 three-phase transformer (TRUPi+1), and the output of N three-phase transformer (TRUPN) is the output of described system;
I wherein is 1 to N natural constant, and N is that progression and value are natural constant.
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| CN 201010130517 CN101777842A (en) | 2010-03-24 | 2010-03-24 | Medium voltage frequency conversion power circuit system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102185489A (en) * | 2011-04-25 | 2011-09-14 | 孙嘉麟 | Three-phase low voltage distribution voltage-reducing device |
| CN105099212A (en) * | 2014-05-16 | 2015-11-25 | 财团法人工业技术研究院 | Voltage booster and series type transformer device |
| CN106549486A (en) * | 2015-09-16 | 2017-03-29 | 通用电气公司 | System and method for operating uninterrupted power source |
| WO2022213525A1 (en) * | 2021-04-07 | 2022-10-13 | 全球能源互联网研究院有限公司 | Ac-ac converter |
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| JP2004208397A (en) * | 2002-12-25 | 2004-07-22 | Hitachi Ltd | Power converter and control method thereof |
| CN201160270Y (en) * | 2007-12-14 | 2008-12-03 | 北京利德华福电气技术有限公司 | Novel high voltage variable-frequency control system with energy feedback function |
| CN101499757A (en) * | 2008-02-02 | 2009-08-05 | 北京中纺锐力机电有限公司 | Novel speed regulating apparatus for 3 phase high voltage switch reluctance motor |
| CN101645646A (en) * | 2009-05-27 | 2010-02-10 | 荣信电力电子股份有限公司 | Method for realizing variable voltage level constant power output of converter |
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2010
- 2010-03-24 CN CN 201010130517 patent/CN101777842A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004208397A (en) * | 2002-12-25 | 2004-07-22 | Hitachi Ltd | Power converter and control method thereof |
| CN201160270Y (en) * | 2007-12-14 | 2008-12-03 | 北京利德华福电气技术有限公司 | Novel high voltage variable-frequency control system with energy feedback function |
| CN101499757A (en) * | 2008-02-02 | 2009-08-05 | 北京中纺锐力机电有限公司 | Novel speed regulating apparatus for 3 phase high voltage switch reluctance motor |
| CN101645646A (en) * | 2009-05-27 | 2010-02-10 | 荣信电力电子股份有限公司 | Method for realizing variable voltage level constant power output of converter |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102185489A (en) * | 2011-04-25 | 2011-09-14 | 孙嘉麟 | Three-phase low voltage distribution voltage-reducing device |
| CN102185489B (en) * | 2011-04-25 | 2013-05-15 | 孙嘉麟 | Three-phase low voltage distribution voltage-reducing device |
| CN105099212A (en) * | 2014-05-16 | 2015-11-25 | 财团法人工业技术研究院 | Voltage booster and series type transformer device |
| CN106549486A (en) * | 2015-09-16 | 2017-03-29 | 通用电气公司 | System and method for operating uninterrupted power source |
| WO2022213525A1 (en) * | 2021-04-07 | 2022-10-13 | 全球能源互联网研究院有限公司 | Ac-ac converter |
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Open date: 20100714 |