CN102541129B - Digital closed-loop vector control three-phase AC standard source - Google Patents
Digital closed-loop vector control three-phase AC standard source Download PDFInfo
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- CN102541129B CN102541129B CN201210001380.1A CN201210001380A CN102541129B CN 102541129 B CN102541129 B CN 102541129B CN 201210001380 A CN201210001380 A CN 201210001380A CN 102541129 B CN102541129 B CN 102541129B
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Abstract
The invention relates to a digital closed-loop vector control three-phase AC standard source which comprises an external module, a management unit module, a signal processing module and a signal output module, wherein the management unit module is bidirectionally connected with the external module and the signal processing module respectively, and the signal output module is connected with the signal processing module and the management unit module. In the invention, a manual control and computer control integrated portable digital standard source can be provided, and the standard source has flexible control, convenience for use and high accuracy.
Description
Technical field
The one that the present invention relates to electric-power metering field exchanges standard source, especially a kind of digital closed-loop vector control three-phase AC standard source.
Background technology
For guaranteeing standard source output signal accuracy, need carry out amplitude control and phase control to output signal.At present, amplitude control both at home and abroad mainly adopts differential technique: output signal converts direct current signal to through AD, and the interior reference signal comparison of direct current signal and machine guarantees the amplitude of output signal.Phase control mostly adopts zero cross fired to carry out detected phase, through phase place/time-sampling, then carries out phase control.
Amplitude control easily causes vibration, and accuracy is low; And phase control is in the time that output signal exists harmonic wave, the introducing of zero cross fired can increase phase error, and needs could determine that through four steps such as phase-detection, calculating, output control and phase equilibrium phase place exports, process complexity.Traditional control method cannot meet the object that standard source is efficient, pin-point accuracy is exported.
Summary of the invention
For solving the deficiencies in the prior art, the invention provides a kind of digital closed-loop vector control three-phase AC standard source and closed-loop vector control method thereof, can realize manual control, the integrated digitizing three-phase AC standard source of computer control, its control is flexible, easy to use, accuracy is high.
The present invention achieves the above object by the following technical solutions: a kind of digital closed-loop vector control three-phase AC standard source, formed by peripheral module, administrative unit module, signal processing module and signal output module, administrative unit module respectively with peripheral module, signal processing module is two-way is connected, signal output module is connected with signal processing module, administrative unit module.
Peripheral module is made up of keyboard, display module, control interface module, and control interface module is made up of RS232 communication interface and RS485 communication interface.
Administrative unit module is made up of ARM unit, power supply and a watchdog timer, and ARM chip model is LPC1758.
Signal processing module is made up of perfect information acquisition module, analog quantity feedback measurement module.
It is the high stability resistance that 2ppm, ratio/angular difference are 0.002% that described perfect information acquisition module voltage sample adopts temperature coefficient, and current sample adopts active compensation formula current transformer.
The DSP model that described analog quantity feedback measurement module adopts is that TMS320VC5502, ADC model are AD7606.
The closed-loop vector control method of described digital closed-loop vector control three-phase AC standard source, comprises the steps:
1) for output signal, by perfect information acquisition module amplitude and the phase place of tracer signal simultaneously;
2) analog quantity feedback measurement module utilizes A/D that the amplitude of gained is become to digital signal with phase transition, by DSP, each information is compared with reference signal respectively, simultaneously to administrative unit output feedback signal;
3) if feedback signal meets system requirements, administrative unit is sent trigger pip, allows signal output; If feedback signal does not meet system requirements, proofread and correct SPWM signal and amplifier control signal, administrative unit is not also sent trigger pip simultaneously, thereby obtain a new feedback signal, again with reference signal comparison, so circulation, until feedback signal meets system requirements, administrative unit is just sent trigger pip.
Outstanding effect of the present invention is:
1) standard source output accuracy is high, and frequency output accuracy reaches 0.002Hz, and voltage/current output accuracy reaches 0.05%, and phase place output accuracy reaches 0.05 °, and power stage accuracy reaches 0.05%RG;
2) adopt closed-loop vector control algolithm, both improved control accuracy, the stability of the operation of assurance system again, degree of stability reaches 0.01%/2min;
3) open interface agreement, can realize manual control and computer controlled automatic, easy to use, efficiency is high;
4) can single or the output of stack multiple harmonic, 2 to 31 subharmonic output accuracy reach 0.5%; Between three-phase voltage, between three-phase current, phase shift arbitrarily between each phase voltage and electric current, can simulate various power failures output; There is perfect overcurrent, overvoltage, overheated, short circuit, open circuit, overload protection.
Accompanying drawing explanation
Fig. 1 is peripheral module theory diagram;
Fig. 2 is administrative unit module principle block diagram;
Fig. 3 is signal processing module theory diagram;
Fig. 4 is signal output module theory diagram.
Embodiment
Below in conjunction with drawings and Examples, technical scheme of the present invention is described in further detail.
The digital closed-loop vector control three-phase AC standard source course of work is as follows: set output signal desired value by peripheral module 1; And send " peripheral hardware input signal " to administrative unit module 2 by peripheral module 1; Administrative unit 2 is to this signal analysis, and signal processing module 3 is given in transmission " control signal "; In signal processing module 3, adopt closed-loop vector control method, obtain " feedback signal ", simultaneously by this signal feedback to administrative unit module 2, " echo signal " sent to signal output module 4.Administrative unit module 2 is analyzed feedback signal, if meet the requirements, sends " trigger pip " to signal output module 4, this module output " echo signal ", meanwhile, administrative unit module 2 also sends a signal to peripheral module 1, shows the waveform of each output signal; If feedback signal is undesirable, administrative unit module 2 is adjusted control signal, then sends it to signal processing module 3, then obtains new feedback signal by closed-loop vector control, so circulation, thus can obtain " echo signal ".
Fig. 1 describes peripheral module in detail." peripheral equipment management signal " has four kinds of instructions, is respectively " R4_in " instruction, " R2_in " instruction, " LCDin " instruction and " alert " instruction; " peripheral hardware input signal " has three kinds of instructions, is respectively " R4_out " instruction, " R2_out " instruction and " LCDout " instruction.RS485 communicates by letter with host computer with " R4_out " instruction by " R4_in ", realizes computing machine Automatic Control.RS232 communicates by letter with external keyboard with " R2_out " instruction by " R2_in ", the input interface for subsequent use during as manual control.Touch-screen, by " LCDin " and " LCDout " instruction and administrative unit module communication, for manual control, shows the state of output signal simultaneously.In the time that this standard source breaks down or be abnormal, " peripheral equipment management signal " transmission " alert " instruction, to protective device, is reported to the police thereby realize.
Fig. 2 describes administrative unit module in detail.ARM unit provides accurately " clock signal " by controlling watchdog timer for analog quantity feedback control module.ARM receives after " peripheral hardware input signal ", sends " ready " instruction to DSP, so DSP sends " six road SPWM signals " and " amplifier control signal ".Above signal, after signal processing module, sends " feedback signal " to DSP; DSP processes after " feedback signal ", sends " ok " instruction to ARM, so ARM sends " trigger pip " to signal output module, sends peripheral equipment management signal to " peripheral module " simultaneously.
Fig. 3 has introduced signal processing module.The direct current signal that electronic switch provides high precision DC reference source converts AC signal to; Corresponding electronic switch is being controlled on each road " SPWM signal ", for regulating phase place and the frequency of AC signal." amplitude control signal " controlling amplifier, thereby regulates the amplitude of AC signal.First, " six road SPWM signals " regulates phase place and the frequency of six tunnel AC signal.Then, after amplifier regulates the phase place and frequency of this signal, output " echo signal " then.Echo signal, after perfect information sampling, converts digital " feedback signal " to by A/D, and then this signal is sent to CPU module.The requirement of closed-loop vector control method is processed and is somebody's turn to do " feedback signal ", obtains more high-precision " echo signal " thereby adjust.
Fig. 4 has introduced signal output module." trigger pip " comprises that A triggers mutually, B triggers mutually and C triggers mutually, and each phase trigger pip is divided into again voltage triggering signal and current trigger signal simultaneously.Similarly, " echo signal " also has A, B, C three-phase voltage/current signal.This module receives after " trigger pip ", by " echo signal " be locked to respectively A, B, C mutually in, then from A, B, C three-phase, export respectively corresponding voltage/current signals.
Claims (1)
1. a digital closed-loop vector control three-phase AC standard source, formed by peripheral module, administrative unit module, signal processing module and signal output module, administrative unit module respectively with peripheral module, signal processing module is two-way is connected, signal output module is connected with signal processing module, administrative unit module
Described peripheral module is made up of keyboard, display module, control interface module, and control interface module is made up of RS232 communication interface and RS485 communication interface,
Described signal processing module is made up of perfect information acquisition module, analog quantity feedback measurement module,
It is the high stability resistance that 2ppm, ratio/angular difference are 0.002% that described perfect information acquisition module voltage sample adopts temperature coefficient, and current sample adopts active compensation formula current transformer,
It is characterized in that, the DSP model that described analog quantity feedback measurement module adopts is that TMS320VC5502, ADC model are AD7606,
Described administrative unit module is made up of ARM unit, power supply and a watchdog timer, and ARM chip model is LPC1758,
The closed-loop vector control method of described digital closed-loop vector control three-phase AC standard source, comprises the steps:
1) for output signal, by perfect information acquisition module amplitude and the phase place of tracer signal simultaneously;
2) analog quantity feedback measurement module utilizes ADC that the amplitude of gained is become to digital signal with phase transition, by DSP, each information is compared with reference signal respectively, simultaneously to administrative unit output feedback signal;
3) if feedback signal meets system requirements, administrative unit is sent trigger pip, allows signal output; If feedback signal does not meet system requirements, proofread and correct SPWM signal and amplifier control signal, administrative unit is not also sent trigger pip simultaneously, thereby obtain a new feedback signal, again with reference signal comparison, so circulation, until feedback signal meets system requirements, administrative unit is just sent trigger pip.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5642300A (en) * | 1996-01-26 | 1997-06-24 | Rotek Instrument Corp. | Precision voltage/current/power source |
| CN1218184A (en) * | 1997-11-26 | 1999-06-02 | 黑龙江省计量科学研究所 | Standard industrial frequency three phase source |
| US6133720A (en) * | 1995-11-30 | 2000-10-17 | General Electric Company | High speed multifunction testing and calibration of electronic electricity meters |
| CN102253258A (en) * | 2011-04-27 | 2011-11-23 | 云南省计量测试技术研究院 | Alternating/direct current calibration source |
-
2012
- 2012-01-05 CN CN201210001380.1A patent/CN102541129B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6133720A (en) * | 1995-11-30 | 2000-10-17 | General Electric Company | High speed multifunction testing and calibration of electronic electricity meters |
| US5642300A (en) * | 1996-01-26 | 1997-06-24 | Rotek Instrument Corp. | Precision voltage/current/power source |
| CN1218184A (en) * | 1997-11-26 | 1999-06-02 | 黑龙江省计量科学研究所 | Standard industrial frequency three phase source |
| CN102253258A (en) * | 2011-04-27 | 2011-11-23 | 云南省计量测试技术研究院 | Alternating/direct current calibration source |
Non-Patent Citations (1)
| Title |
|---|
| 肖博爱等.基于DSP的标准源设计.《国外电子测量技术》.2007,第26卷(第02期),第75-78,82页. * |
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