CN102158114B - Method and device for measuring and controlling a four-quadrant cascaded high voltage transducer power unit - Google Patents
Method and device for measuring and controlling a four-quadrant cascaded high voltage transducer power unit Download PDFInfo
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Abstract
The invention discloses a method for measuring and controlling a four-quadrant cascaded high voltage transducer power unit and a device therefore. The device comprises a control circuit, a switching amount detection part, an analog amount detection part, a digital circuit and an IGBT drive circuit. The control circuit adopts a 'DSP + programmable logic controller' manner and takes the programmable logic controller as a circuit core of the entire device; the DSP chip, the switching amount detection part, the digital circuit and the IGBT drive circuit are respectively connected with the programmable logic controller; the analog amount detection part, is connected with the digital circuit. The invention has the advantages that: the DSP chip greatly improves operating speed and precision for the entire device, the interference resistance property is strong, the measurement is accurate, the operation is simple, the maintenance is convenient and the like.
Description
Technical field
The invention belongs to the high voltage transducer power unit observation and control technology in the field of power electronics, be specifically related to a kind of four-quadrant cascaded high-voltage frequency converter power cell investigating method and device.
Background technology
At present, the whole world perplexs for energy scarcity, and the energy situation of China is especially severe.Along with fast development of Chinese economy, the energy becomes the bottleneck of restriction economic growth, and saving consumption reduction also just becomes the problem of country and enterprise's serious concerns.High voltage converter with desirable energy-saving effect and speed adjusting performance causes showing great attention to of responsible departments of the government and each high energy-consuming enterprises, and frequency conversion becomes first-selected energy-conserving product.
The cascading multiple electrical level high voltage converter has the advantages that to solve the high-voltage motor driving problems and be easy to expand electric pressure in the low pressure mode because of it, have advantages such as energy-saving effect is remarkable simultaneously, make it obtain application more and more widely in high-voltage motor frequency control field.In the evolution of high-pressure frequency-conversion Driving technique, owing to be subjected to the restriction of factors such as association area and self-technique development, present cascade multilevel inverter all adopts diode not control rectifier bridge, energy can only unidirectional delivery, need can't be applied in the varying duty dragging system of four quadrant running, limit the application of high voltage converter, also caused the serious problem of power network current harmonic pollution.
At the deficiencies in the prior art, the present invention is proposed.
Summary of the invention
The objective of the invention is at the existing problem of existing cascading multiple electrical level high voltage converter, proposing a kind of energy can bi-directional, need can be applied to cascaded high-voltage frequency converter power cell investigating method and device in the varying duty dragging system of four quadrant running.
The technical solution adopted in the present invention is: a kind of four-quadrant cascaded high-voltage frequency converter power cell investigating method comprises control circuit, switching value test section, analog quantity test section, digitizer and IGBT drive circuit.Described control circuit adopts the mode of " DSP+ programmable logic controller (PLC) ", be the circuit core of whole device with programmable logic controller (PLC), dsp chip, switching value test section, digitizer, IGBT drive circuit are connected with programmable logic controller (PLC) respectively, and the analog quantity test section is connected with digitizer; The analog measurement result sends into digitizer conversion, transformation result is sent into programmable logic controller (PLC), programmable logic controller (PLC) carries out logical operation and processing to transformation result, programmable logic controller (PLC) also can send control signal to digitizer, conversion timing sequence and the processing procedure of control analog signal, simultaneously, the repeatedly sampling to analog signal can be realized in the hardware programming language, digital signal is carried out software filtering, high pressure and harmonic signal are carried out filtering for the second time, improved antijamming capability.
Described control circuit can adopt the mode of " DSP+ programmable logic controller (PLC) ", the result of digitizer is sent into logic processor, logic processor carries out logical operation to transformation result, DSP sends control command according to the result of logical operation to frequency converter, simultaneously, logic processor can also the control figure processing sequential and processing procedure, wherein programmable logic controller (PLC) can be selected a kind of in field programmable gate array chip, complex programmable device chip, microcontroller chip and the DSP chip.
Described switching value test section is made up of optical coupling isolation circuit and signal conditioning circuit, can detect states such as high voltage converter fuse, circuit breaker, optical coupling isolation circuit can effectively be realized level conversion, isolated high-voltage part and low-voltage circuit, reduce and disturb, signal conditioning circuit filtering harmonic wave and burr are converted to smooth stable signal with low-voltage signal and send into programmable logic device.
Described analog quantity test section mainly is made of difference channel, shaping circuit, filter circuit, the analog measurement result handles through digitizer after " difference amplification-shaping-filtering " and sends into programmable logic controller (PLC), this kind processing mode is abominable at the environment for use of high voltage converter, under the situation of high temperature, higher harmonics, strong noise, improve the antijamming capability of high voltage converter, guaranteed the accuracy of analog measurement.
A kind of four-quadrant cascaded high-voltage frequency converter power cell measure and control device according to said method proposes comprises control circuit, switching value test section, analog quantity test section, digitizer and IGBT drive circuit.Described control circuit adopts the mode of " DSP+ programmable logic controller (PLC) ", be the circuit core of whole device with programmable logic controller (PLC), dsp chip, switching value test section, digitizer, IGBT drive circuit are connected with programmable logic controller (PLC) respectively, and the analog quantity test section is connected with digitizer.
Described control circuit can adopt the mode of " DSP+ programmable logic controller (PLC) ", and wherein programmable logic controller (PLC) can be selected a kind of in field programmable gate array chip, complex programmable device chip, microcontroller chip and the DSP chip.
Described switching value test section is made up of optical coupling isolation circuit and signal conditioning circuit.
Described analog quantity test section mainly is made of difference channel, shaping circuit, filter circuit, and the testing result of analog quantity test section is sent into programmable logic controller (PLC) after handling through digitizer.
Described IGBT drive circuit comprises power supply, logic controller, circuit protection, photoelectric isolation module and power amplification circuit, comprises the driving to rectification and two part IGBT of inversion.
Described four-quadrant cascaded high-voltage frequency converter power cell measure and control device is by optical fiber and the communication of high voltage converter master control borad.
Described four-quadrant cascaded high-voltage frequency converter power cell measure and control device adopts the universal design that is fit to each power cell.
The invention has the advantages that:
1, the control system of frequency converter adopts digital signal processor DSP control.The characteristics of DSP are fast operations, and its hardware itself just is fit to complicated Motor Control and a large amount of multistage complex calculation very much.
2, the analog quantity testing result is sent into the processing mode of programmable logic device by digitizer, has improved the antijamming capability of high voltage converter, has guaranteed the accuracy of analog measurement.
3, the IGBT drive circuit is except driving IGBT, also can carry out overvoltage, protection such as under-voltage to IGBT.
4, be by optical fiber communication between this device and the high voltage converter master controller, optical-fibre communications reduces long-distance transmissions to be disturbed, isolated high-voltage, and anti-electromagnetic interference improves accuracy and the reliability of signal transmission, and is easy to use, greatly reduces system cost.
Description of drawings
Fig. 1 is the structure distribution figure of cascaded high-voltage frequency converter power cell of the present invention.
Fig. 2 is the composition structure chart of four-quadrant cascaded high-voltage frequency converter power cell measure and control device of the present invention.
Fig. 3 is the use state diagram of four-quadrant cascaded high-voltage frequency converter power cell measure and control device of the present invention.
Embodiment
Further set forth the present invention below by the drawings and specific embodiments.
Figure 1 shows that cascaded high-voltage frequency converter power cell A
1-A
n, B
1-B
n, C
1-C
nDistributed architecture.
As shown in Figure 2, a kind of four-quadrant cascaded high-voltage frequency converter power cell measure and control device comprises control circuit, switching value test section, analog quantity test section, digitizer and IGBT drive circuit.Described control circuit adopts the mode of " DSP+ programmable logic controller (PLC) ", be the circuit core of whole device with programmable logic controller (PLC), dsp chip, switching value test section, digitizer, IGBT drive circuit are connected with programmable logic controller (PLC) respectively, and the analog quantity test section is connected with digitizer.
Described control circuit can adopt the mode of " DSP+ programmable logic controller (PLC) ", the result of digitizer is sent into logic processor, logic processor carries out logical operation to transformation result, DSP sends control command according to the result of logical operation to frequency converter, simultaneously, logic processor can also the control figure processing sequential and processing procedure, wherein programmable logic controller (PLC) can be selected a kind of in field programmable gate array chip, complex programmable device chip, microcontroller chip and the DSP chip.
Described switching value test section is made up of optical coupling isolation circuit and signal conditioning circuit, can detect states such as high voltage converter fuse, circuit breaker, optical coupling isolation circuit can effectively be realized level conversion, isolated high-voltage part and low-voltage circuit, reduce and disturb, signal conditioning circuit filtering harmonic wave and burr are converted to smooth stable signal with low-voltage signal and send into programmable logic device.
Described analog quantity test section mainly is made of difference channel, shaping circuit, filter circuit, the analog measurement result handles through digitizer after " difference amplification-shaping-filtering " and sends into programmable logic controller (PLC), this kind processing mode is abominable at the environment for use of high voltage converter, under the situation of high temperature, higher harmonics, strong noise, improve the antijamming capability of high voltage converter, guaranteed the accuracy of analog measurement.
The analog measurement result sends into digitizer conversion, transformation result is sent into programmable logic controller (PLC), programmable logic controller (PLC) carries out logical operation and processing to transformation result, programmable logic controller (PLC) also can send control signal to digitizer, conversion timing sequence and the processing procedure of control analog signal, simultaneously, the repeatedly sampling to analog signal can be realized in the hardware programming language, digital signal is carried out software filtering, high pressure and harmonic signal are carried out filtering for the second time, improved antijamming capability.
Described IGBT drive circuit comprises power supply, logic controller, circuit protection, photoelectric isolation module and power amplification circuit, comprise the driving to rectification and two part IGBT of inversion, when high voltage converter operates in first and third quadrant, the IGBT of rectification side is as rectifier diode usefulness, with the secondary side voltage full-wave rectification of output; When frequency converter operates in second, during four-quadrant, the IGBT of rectification side makes the usefulness of energy feedback, the motor side electricity can be passed to phase shifting transformer, and then pass to electrical network, has realized the double-fed of energy between electrical network and motor.
Described four-quadrant cascaded high-voltage frequency converter power cell measure and control device is by optical fiber and the communication of high voltage converter master control borad, optical-fibre communications can reduce long-distance transmissions and disturb, isolated high-voltage, anti-electromagnetic interference, improve accuracy and the reliability of signal transmission, easy to use, greatly reduce system cost.
Described four-quadrant cascaded high-voltage frequency converter power cell measure and control device adopts the universal design that is fit to each power cell, can realize that each power cell measurement mechanism exchanges, and improves compatible.
Embodiment 1
A kind of four-quadrant cascaded high-voltage frequency converter power cell measure and control device comprises control circuit, switching value test section, analog quantity test section, digitizer and IGBT drive circuit.Described control circuit adopts the mode of " DSP+FPGA ", is the circuit core of whole device with FPGA, and dsp chip, switching value test section, digitizer, IGBT drive circuit are connected with FPGA respectively, and the analog quantity test section is connected with digitizer.
Form the switching value test section by buffer circuit and signal conditioning circuit, buffer circuit is realized the high-low level conversion of switching value, isolated high-voltage part and low-voltage circuit, signal conditioning circuit filtering harmonic wave and burr are converted to smooth stable signal with low-voltage signal and send into FPGA.
Finished the measurement of analog quantity by difference channel, measurement result is through shaping, send into the digitlization change-over circuit after filtering is handled and be converted to digital signal, digital signal is sent into FPGA and is carried out logical operation, operation result is sent into digital signal processor, digital signal processor is to analog signal, the switching value signal is judged and is analyzed, various status signals are passed to industrial computer by serial ports RS485, but real-time monitored is to the running status of power cell on the man-machine interface on the industrial computer, simultaneously, digital signal processor also sends control command, the driving signal of control power cell.
The IGBT drive circuit comprises power supply, logic controller, circuit protection, photoelectric isolation module and power amplification circuit, comprise the driving to rectification and two part IGBT of inversion, when high voltage converter operates in first and third quadrant, the IGBT of rectification side is as rectifier diode usefulness, with the secondary side voltage full-wave rectification of output; When frequency converter operates in second, during four-quadrant, the IGBT of rectification side makes the usefulness of energy feedback, the motor side electricity can be passed to phase shifting transformer, and then pass to electrical network, has realized the double-fed of energy between electrical network and motor.
This device is by optical fiber and the communication of high voltage converter master control borad.
The use state of a kind of four-quadrant cascaded high-voltage frequency converter power cell checkout gear of the present invention as shown in Figure 3, the operation principle of this device is:
This device connects power cell and frequency converter master board, be responsible for power cell information and detect and control power cell, and be responsible for and the communication of frequency converter master controller, behind this device of detected power cell information via of test section, carrying out logical operation by the FPGA in this device handles, and result sent into the frequency converter master controller, master controller installs feedack according to this, power cell is sent control signal, control signal is installed via this, by the control of this device realization to power cell, the man-machine interface communication of frequency converter master controller and control desk, whole process can show that all the maintenance personal can judge the system failure easily by the man-machine interface of control desk, has greatly reduced the plant maintenance difficulty by man-machine interface.
Claims (2)
1. a four-quadrant cascaded high-voltage frequency converter power cell measure and control device comprises control circuit, switching value test section, analog quantity test section, digitizer and IGBT drive circuit; Described control circuit adopts the mode of " DSP+ programmable logic controller (PLC) ", be circuit core with the programmable logic controller (PLC), DSP, switching value test section, digitizer, IGBT drive circuit are connected with programmable logic controller (PLC) respectively, and the analog quantity test section is connected with digitizer; Programmable logic controller (PLC) is selected a kind of in field programmable gate array chip, complex programmable device chip, microcontroller chip and the DSP chip; The switching value test section is made up of optical coupling isolation circuit and signal conditioning circuit; The analog quantity test section mainly is made of difference channel, shaping circuit, filter circuit, and the testing result of analog quantity test section is sent into programmable logic controller (PLC) after handling through digitizer; It is characterized in that described IGBT drive circuit comprises power supply, logic controller, circuit protection, photoelectric isolation module and power amplification circuit, comprise the driving to rectification and two part IGBT of inversion.
2. a kind of four-quadrant cascaded high-voltage frequency converter power cell measure and control device according to claim 1, this measure and control device is by optical fiber and the communication of high voltage converter master control borad.
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103019231B (en) * | 2012-12-14 | 2016-02-10 | 天津瑞能电气有限公司 | A kind of control box for frequency converter ageing test apparatus |
| CN105652852B (en) * | 2015-12-21 | 2018-08-24 | 长沙奥托自动化技术有限公司 | A kind of Inspection and monitoring system of high voltage transducer power unit and its mainboard |
| CN111145529B (en) * | 2019-12-31 | 2023-10-13 | 深圳库马克科技有限公司 | Communication method of cascade power unit of high-voltage frequency converter |
| CN111145530B (en) * | 2019-12-31 | 2023-10-13 | 深圳库马克科技有限公司 | Communication method of high-voltage frequency converter power unit |
| CN114626288B (en) * | 2022-01-19 | 2024-08-02 | 北京交通大学 | An IGBT drive system with digital control and online intelligent detection and reliable communication and its evaluation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201752105U (en) * | 2010-06-24 | 2011-02-23 | 国网电力科学研究院 | Controller for static variable-frequency starting motor of pumped storage power station |
| CN201976063U (en) * | 2011-04-13 | 2011-09-14 | 株洲变流技术国家工程研究中心有限公司 | Four-quadrant cascaded high voltage frequency converter power unit measurement and control device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201752105U (en) * | 2010-06-24 | 2011-02-23 | 国网电力科学研究院 | Controller for static variable-frequency starting motor of pumped storage power station |
| CN201976063U (en) * | 2011-04-13 | 2011-09-14 | 株洲变流技术国家工程研究中心有限公司 | Four-quadrant cascaded high voltage frequency converter power unit measurement and control device |
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Application publication date: 20110817 Assignee: Upper Hainan Che Hange Marine engineering Co., Ltd Assignor: Zhuzhou National Engineering Research Center of Converters Co., Ltd. Contract record no.: 2015430000034 Denomination of invention: Method and device for measuring and controlling a four-quadrant cascaded high voltage transducer power unit Granted publication date: 20130821 License type: Exclusive License Record date: 20150508 |
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