CN101431290B - Optical fiber connection method of cascaded medium-high voltage frequency converter - Google Patents
Optical fiber connection method of cascaded medium-high voltage frequency converter Download PDFInfo
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- CN101431290B CN101431290B CN2008101439523A CN200810143952A CN101431290B CN 101431290 B CN101431290 B CN 101431290B CN 2008101439523 A CN2008101439523 A CN 2008101439523A CN 200810143952 A CN200810143952 A CN 200810143952A CN 101431290 B CN101431290 B CN 101431290B
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Abstract
The utility model provides an optical fiber connection method of cascaded type medium and high voltage inverter, the control of every group power unit adopts the mode of serial communication, the output optic fibre of main control unit is connected with the first power unit of every group, first power unit passes through optic fibre series connection with this group's second power unit, second power unit passes through optic fibre series connection with this group's third power unit again, the last power unit of every group passes through optic fibre series connection with next power unit in proper order, the output optic fibre to the power unit of every group tail end is connected with the main control unit, adopt optic fibre end to end series connection interconnect between every group power unit.
Description
Technical field
The present invention relates to a kind of transmission means and device of mesohigh frequency converter, is a kind of optical fiber connection mode that is used for cascade connection type mesohigh frequency converter specifically, is mainly used in the variable-frequency control technique of motor.
Background technology
During at present electric energy used, only having an appointment about 70% was to supply with motor to use.The variable-frequency control technique of motor has obtained using widely at industrial circle, and has spread to other field gradually as an effective means of electrical machine energy-saving.
High voltage converter is the main mode that realizes the heavy-duty motor variable-frequency control technique.Because many level of power unit cascade type, in the stability of a system, control mode, debugging scope and aspect harmonic pollution in electric power net, have apparent in view advantage.Therefore become the main flow implementation method in the present high voltage converter.
Tradition cascade connection type mesohigh frequency converter adopts optical fiber to connect main controller and each power model more.In general, about 2 times of the power model number of needed number of fibers and composition frequency converter.Because the power model number is more, so the number of optical fiber and fiber optical transceiver is huge, line is complicated.
Therefore necessary this is improved.
Summary of the invention
The object of the invention is intended to overcome the deficiency of existing cascade connection type mesohigh frequency converter; A kind of number of fibers and power model number transmission method and the device thereof still less of forming frequency converter are provided; The cascade connection type mesohigh frequency converter that comes out through the present invention technology made; Number with optical fiber and fiber optical transceiver still less, line is characteristic of simple more.
The objective of the invention is to realize: a kind of cascade connection type mesohigh frequency converter optic fiber connection method through following technical proposals; A kind of optic fiber connection method of cascade connection type mesohigh frequency converter; Described frequency converter is a kind of many level of power unit cascade type frequency converter; Be made up of 9 power cells, 9 power cells are one group with per three, form U group power model group, V group power model group and W group power model group respectively; And having constituted three-phase output voltage, the output of U group power model, V group power model and W group power model is electrically connected with the three-phase inlet of motor respectively; Each power model is directly controlled by master controller; Described frequency converter high pressure adopts the mode of serial communication, is made up of the power unit cascade of a plurality of low pressure, and the mode of serial communication is adopted in the control of every group of each power cell; Every group of each power cell adopts the fiber optic serial communication modes to be connected with the control between the master controller; The output optical fibre of master controller is connected with every group of first power cell; First power cell and this are organized second power cell and are connected in series through optical fiber; Second power cell organized the 3rd power cell with this again and is connected in series through optical fiber; Every group a last power cell and next power cell are connected in series through optical fiber successively, and extremely the output optical fibre of the power cell of every group of caudal end is connected with master controller, adopt optical fiber to interconnect from beginning to end between every group of each power cell; Described power cell disposes the different coding address, and master controller is through the mode transmitting control commands of broadcasting, and power cell transmits module status information to master controller successively according to the information in the control command; It is characterized in that: the step-down transformer of said frequency converter input side adopts phase shift system to constitute; Output side transducer adopts many level sine pulse width modulation (PWM) technology.
The present invention proposes a kind of optical fiber connected mode of novelty; This connected mode adopts the mode of simple optical fiber series connection to substitute the parallel connected mode of traditional multifiber; Thereby a large amount of minimizings the number of optical fiber and fiber optical transceiver, reduced system cost, improved whole reliability.
Description of drawings
Fig. 1 is many level of power unit cascade of the present invention type high voltage converter structural representation;
Fig. 2 is the control structure sketch map of every group of power cell of the present invention.
Embodiment
To combine accompanying drawing and embodiment that the present invention is done further description below.
Shown in Figure 1 is the topological structure sketch of traditional 5 level high-voltage frequency converters of being made up of 9 power cells.9 power models are one group with per three; Form U group power model group, V group power model group and W group power model group respectively, and constituted three-phase output voltage (U, V; W), the output of U group power model, V group power model and W group power model is electrically connected with the three-phase inlet of motor respectively.Power model is directly controlled by master controller.Two optical fiber are arranged between each power model and the master controller.Wherein a control command that is used to send master controller is to power model, and an other state information that is used for the transmitted power module is given master controller.The distance of every length of fiber and controller and power model is suitable.Every length of fiber is between 5 meters to 6 meters.
In system shown in Figure 1, master controller and between connection line of optic fibre be 18, calculate according to average 5.5 meters distance.The length of fiber of every group of power cell needs is 33 meters, and three groups of length of fiber that need altogether are 99 meters.Need 9 pairs of fiber optical transceivers on the master controller.Add the number of fiber optical transceiver on the power cell, be total up to 18 pairs.
With regard to generally; The number of every group of power cell can change from every group 1 to 10, and the number of establishing every group is N, adopts traditional controller directly to control under the mode of each power cell; Because of three groups of power cells of needs; The optical fiber that then needs at least length be 33N rice, radical is 6N, the number of the fiber optical transceiver that needs is 6N.Under the maximum case, the total length of optical fiber can reach 330 meters, and radical is 60, and the fiber optical transceiver number is 60 pairs.Therefore, the wiring of system is complicated, and cost is high, and has reduced the global reliability of system.
Fig. 2 has provided the control mode of a concrete power cell of the present invention.The basic thought of novel optical fiber connection mode is the mode that the mode of employing serial communication substitutes present each power cell of controller parallel control.
As shown in Figure 2, a kind of many level of power unit cascade type frequency converter is made up of 9 power models; 9 power models are one group with per three; Form U group power model group, V group power model group and W group power model group respectively, and constituted three-phase output voltage (U, V; W), the output of U group power model 4, V group power model 5 and W group power model 7 is electrically connected with the three-phase inlet of motor 6 respectively.Each power model is directly controlled by master controller 8.Described frequency converter high pressure adopts the mode of serial communication; Power unit cascade by a plurality of low pressure is formed; The mode of serial communication is adopted in the control of every group of power cell, and the output optical fibre 1 of master controller is connected with every group of first power cell, and first power cell and this are organized second power cell and is connected in series through optical fiber 9; Second power cell organized the 3rd power cell with this again and is connected in series through optical fiber 2; Every group a last power cell and next power cell are connected in series through optical fiber successively, and extremely the output optical fibre 3 of the power cell of every group of caudal end is connected with master controller 8, adopt optical fiber to interconnect from beginning to end between every group of power cell.With U group among Fig. 2 is example; Master controller has only two optical fiber to link to each other with U group power cell; The control command that wherein is used to send master controller is connected for the output optical fibre of power model with the optical fiber input interface of U1; The input optical fibre of an other state information that is used for the transmitted power module and the optical fiber delivery outlet of U3 are connected, and the output of the optical fiber of U1 is connected with the optical fiber input of U2, and the optical fiber of U2 is exported with the optical fiber input of U3 and is connected.Power cell disposes the different coding address, and master controller is through the mode transmitting control commands of broadcasting, and power cell transmits module status information to master controller successively according to the information in the control command.
The mode of novel optical fiber connected mode only needs 3 (6) optical fiber connected between master controller and each power cell.Because it is shorter to connect fiber lengths between the power cell, is generally less than 1 meter, according to 1 meter calculating.And establish that the power cell number is N in every group.Then have:
Total fiber lengths can calculate according to following formula: 6 * 5.5+3 * (N-1)=30+3N;
Total optical fiber radical is: 3+3N
Total fiber optical transceiver logarithm: 3+3N
Following table 1 is the contrast of present optical fiber connected mode and novel optical fiber connected mode:
The contrast of two kinds of optical fiber connected modes of table 1
When N=10:
The optical fiber total length of novel connected mode is a 30+30=60 rice, and the optical fiber total length that traditional fiber connects is 330 meters.The total length of novel connection has only 18.1% of traditional fiber connected mode.
The fiber optical transceiver of novel connected mode is to being 33, and the fiber optical transceiver that traditional fiber connects is to being 60.The fiber optical transceiver number of novel connection is 55% of a traditional approach.
The number of fibers of novel connected mode is to being 33, and the number of fibers that traditional fiber connects is 60.The fiber optical transceiver number of novel connection is 55% of a traditional approach.
This shows that novel connected mode can significantly reduce the number of optical fiber and fiber optical transceiver.Big more in number of modules, it reduces more obvious.
The novel optical fiber connection mode that the present invention proposes can reduce the number that optical fiber connects in a large number, reduces cost thereby reach, and reduces the system wiring complexity, improves the purpose of reliability.
In addition, the step-down transformer of frequency converter input side adopts phase shift system, can effectively eliminate the harmonic pollution to electrical network like this; Outlet side adopts many level sine pulse width modulation (PWM).In addition, when certain power cell breaks down,, can log off automatically, and remaining power cell can continue to keep the operation of system, reduce the loss that causes when shutting down through bypass.System adopts modularized design, can replace malfunctioning module rapidly.This many level of power unit cascade type frequency converter is applicable to the motor of different electric pressures.
Claims (1)
1. the optic fiber connection method of a cascade connection type mesohigh frequency converter; Described frequency converter is a kind of many level of power unit cascade type frequency converter; Be made up of 9 power cells, 9 power cells are one group with per three, form U group power model group, V group power model group and W group power model group respectively; And having constituted three-phase output voltage, the output of U group power model, V group power model and W group power model is electrically connected with the three-phase inlet of motor respectively; Each power model is directly controlled by master controller; Described frequency converter high pressure adopts the mode of serial communication, is made up of the power unit cascade of a plurality of low pressure, and the mode of serial communication is adopted in the control of every group of each power cell; Every group of each power cell adopts the fiber optic serial communication modes to be connected with the control between the master controller; The output optical fibre of master controller is connected with every group of first power cell; First power cell and this are organized second power cell and are connected in series through optical fiber; Second power cell organized the 3rd power cell with this again and is connected in series through optical fiber; Every group a last power cell and next power cell are connected in series through optical fiber successively, and extremely the output optical fibre of the power cell of every group of caudal end is connected with master controller, adopt optical fiber to interconnect from beginning to end between every group of each power cell; Described power cell disposes the different coding address, and master controller is through the mode transmitting control commands of broadcasting, and power cell transmits module status information to master controller successively according to the information in the control command; It is characterized in that: the step-down transformer of said frequency converter input side adopts phase shift system to constitute; Output side transducer adopts many level sine pulse width modulation (PWM) technology.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015041638A1 (en) * | 2013-09-18 | 2015-03-26 | Siemens Industry, Inc. | Fiber optic ring for bypass system in multi-cell power supply |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP5378274B2 (en) * | 2010-03-15 | 2013-12-25 | 株式会社日立製作所 | Power converter |
| CN101951160B (en) * | 2010-08-20 | 2013-09-11 | 艾默生网络能源有限公司 | Cascade module control system |
| CN102288217A (en) * | 2011-04-12 | 2011-12-21 | 株洲变流技术国家工程研究中心有限公司 | Integrated type high-voltage frequency converter analog quantity detecting method and device |
| CN102496950B (en) * | 2011-11-11 | 2014-03-05 | 国电南京自动化股份有限公司 | Power unit grid-connected and feedback device for high-voltage concatenated frequency converter |
| CN104079355A (en) * | 2014-06-30 | 2014-10-01 | 辽宁荣信众腾科技有限公司 | Method and device for achieving serial communication between controller and power units |
| CN104901516B (en) * | 2015-06-12 | 2017-10-13 | 厦门科华恒盛股份有限公司 | A kind of power model signal connection device and its implementation |
| CN105551230A (en) * | 2016-03-04 | 2016-05-04 | 辽宁荣信电气传动技术有限责任公司 | Single-fiber ring network communication topology structure for power units of high-voltage frequency converter |
| CN109560870A (en) * | 2017-09-25 | 2019-04-02 | 台达电子企业管理（上海）有限公司 | Communication system for cascade connection type power conversion apparatus |
| CN107707105A (en) * | 2017-10-26 | 2018-02-16 | 中国南方电网有限责任公司超高压输电公司天生桥局 | Suitable for the communication network topology and method of soft straight modular multilevel converter valve |
| CN108306485B (en) * | 2018-02-26 | 2019-12-03 | 新风光电子科技股份有限公司 | A kind of generation method of tandem type high voltage transducer power unit pwm signal |
| CN108880201B (en) * | 2018-09-14 | 2023-12-22 | 西门子（上海）电气传动设备有限公司 | High-voltage frequency converter |
| CN112542883B (en) * | 2019-09-20 | 2023-11-14 | 台达电子工业股份有限公司 | Power system with communication function for solid-state transformer structure and communication module |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015041638A1 (en) * | 2013-09-18 | 2015-03-26 | Siemens Industry, Inc. | Fiber optic ring for bypass system in multi-cell power supply |
| US9875860B2 (en) | 2013-09-18 | 2018-01-23 | Siemens Aktiengesellschaft | Fiber optic ring for bypass system in multi-cell power supply |
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