CN100416968C - Capacitor switching and monitoring system based on single chip microcomputer and configuration - Google Patents
Capacitor switching and monitoring system based on single chip microcomputer and configuration Download PDFInfo
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- CN100416968C CN100416968C CNB2005101223008A CN200510122300A CN100416968C CN 100416968 C CN100416968 C CN 100416968C CN B2005101223008 A CNB2005101223008 A CN B2005101223008A CN 200510122300 A CN200510122300 A CN 200510122300A CN 100416968 C CN100416968 C CN 100416968C
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E40/30—Reactive power compensation
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Abstract
The present invention relates to a capacitor switching and monitoring system based on a single chip microcomputer and configuration, which is composed of an upper computer of an industrial computer and a lower computer of a single chip microcomputer, wherein the lower computer uses a single chip microcomputer chip with high performance as a control core and uses an analog to digital converter with high resolution; thus, the precision and the processing speed of data conversion are increased, the fast automatic grading switch of a plurality of groups of capacitors is realized, requirements of the rapidity and the real time of the fundamental wave reactive compensation of low-voltage distribution networks can be met, and the purposes of improving power factors, increasing the output of transformers, reducing the loss of distribution networks and increasing electric energy quality are achieved; the upper computer provides a visual menu, so triers can modify system parameters on line according to the prompt of configuration interface, and the running condition of the system can be displayed in real time, which provides exact reliable bases for analysis and decision.
Description
(1) technical field:
The invention belongs to power system reactive power compensation control technology field, particularly a kind of capacitor switching supervisory control system based on single-chip microcomputer and configuration.
(2) background technology:
Reactive power compensation device for capacitor can be according to the reactive power and the line voltage of distribution system internal loading, control thyristor switchable capacitor group, the required reactive power of compensation load, reach and improve power factor, increase transformer and exert oneself, reduce network loss, improve the purpose of the quality of power supply; This kind device generally is made of single-chip microcomputer at present, the certainty of measurement height, and function ratio is more complete, has improved automaticity, but still not ideal enough to online demonstration, monitoring, historical query and the printing function of data; In recent years, along with the function of computer is gradually become strong, various human interface software continued to bring out, and this provides the visual control picture for the operation of capacitor.
(3) summary of the invention:
The object of the present invention is to provide a kind of capacitor switching supervisory control system based on single-chip microcomputer and configuration, in conjunction with high performance singlechip chip, close friend's monitored picture, can overcome the deficiency of present control system preferably, is a kind of practicality, close friend's supervisory control system.
Technical scheme of the present invention: a kind of capacitor switching supervisory control system based on single-chip microcomputer and configuration, it is characterized in that it is by being constituted as the configuration system of host computer with as the Single Chip Microcomputer (SCM) system of slave computer, and be connected by serial port with Single Chip Microcomputer (SCM) system as slave computer as the configuration system of host computer; Said configuration system as host computer is to be made of real-time data base and configuration software core; Said Single Chip Microcomputer (SCM) system as slave computer is partly to be made of analog quantity importation, amplification filtering circuit, A/D change-over circuit, microprocessor and storage area, power driving circuit, communication interface; The secondary terminal of said analog quantity importation external impressed current and voltage transformer, the analog quantity output connects the input of amplification filtering circuit, the output of amplification filtering circuit connects the input of A/D change-over circuit, the output of A/D change-over circuit connects the input of microprocessor and storage area, the output of microprocessor and storage area connects power driving circuit, and the output of microprocessor and storage area is connected with host computer by serial communication interface.
Above-mentioned said analog quantity importation is the sampling system of electric current, voltage, the input of this part connects external voltage instrument transformer summation current transformer, its output connects the input of amplification filtering circuit, and sampling system is delivered to control system by voltage, current transformer after with the voltage of system, current signal digitlization; The 220V phase voltage is directly taken in the voltage input of voltage importation, adopt precision resistance dividing potential drop form to obtain the receptible output voltage of A/D, the electric current importation be three-phase current and neutral current behind external current transformer secondary side as the input variable of this part, adopt current transformer to carry out current transformation, secondary adds precision resistance, current information is converted to the receptible voltage of A/D, all installs electromagnetic compatibility and surge absorbing device during circuit design additional to improve antijamming capability.
Above-mentioned said amplification filtering circuit is used for the current and voltage signals of adopting is amplified, be beneficial to and carry out A/D conversion to reach certain amplitude, can constitute differential amplifier by resistance R 1, R2 capacitor C 1, C2, C3, C4, can also adopt the meter specially amplifier.
Above-mentioned said A/D change-over circuit is used for electric current after the amplification filtering and voltage signal are converted to the manageable digital signal of single-chip microcomputer; The transducer input is the signal after amplifier amplifies, and wherein the low noise precision voltage source is used for A/D conversion reference voltage, and its output voltage is an adjustable voltage.
Above-mentioned said microprocessor and storage area are made of CPU, clock chip, Flash memory, RAM, switching value input channel, switching value output channel etc.; Voltage, electric current insert the single-chip microcomputer hsi port after the A/D conversion, CPU by single-chip microcomputer carries out the data computation processing, send trigger impulse by the single-chip microcomputer high speed output, this trigger impulse carries out photoelectricity isolation and triode amplification through power drive pipe circuit, offer the IGBT gate pole input of gate level turn-off thyristor circuit, the conducting of control thyristor is used for switched capacitor; Clock adopts hardware clock, and the data tape of record has markers, and the Flash memory is used for the data of storage of collected, calculating and statistics; The switching value input then is used for monitoring the input state of capacitor, and the switching value output variable is sent into host computer, is handled by the host computer configuration system.
Above-mentioned said communication interface is provided with serial interface chip and communicates by letter with host computer, system adopts serial ports that signal is transferred to host computer, after serial signal is made level conversion by chip, become serial port, this mouth and host computer communicate, accept the instruction of host computer, and the A/D transformation result is transferred to host computer.
Operation principle of the present invention: this programme is based on the capacitor switching supervisory control system of single-chip microcomputer and configuration, by single-chip microcomputer as central control unit, load voltage, the sampled signal of electric current is through capacitance-resistance filter, amplifying element is sent into the A/D change-over circuit, the input channel of single-chip microcomputer is sent in the output of A/D change-over circuit, by the quick calculation process of software, obtain the required reactive power switching capacity of load, fast again zoom table decision should drop into the progression of capacitor, the control flow of deactivation capacitor switch, and according to the regular branch road of determining switched capacitor of binary coding, send the relative trigger useful signal then, dynamically do not have the ground of impact by thyristor and drop into capacitor; Host computer is followed the tracks of on-site parameters by real-time data base and is changed by serial line interface and single chip communication, and shows the various running statuses of current capacitor in real time.
Superiority of the present invention and technique effect are: 1, adopted high-precision a/d converter, adopted ∑ Δ technology to finish the A/D conversion, reduced the bandwidth of analog signal effectively, satisfied the requirement of sampling thheorem; 2, the design of the high-grade single-chip microcomputer of Cai Yonging also can effectively improve the data processing precision of system; 3, adopt IGBT as switching device, break-make can realize dynamically following the tracks of fast compensation fast, can follow the tracks of the sudden change of impact load fast, keep best feed power factor at any time, realize quick dynamic passive compensation, thereby reduce mains fluctuations, improve power supply quality; 4, the communication interface of the host computer of this system and slave computer adopts serial communication interface, and host computer shows the major parameter of electrical network in real time, is convenient to enquiry of historical data and statistics demonstration; 5, this system can be widely used in the automatic adjusting of high pressure and low-voltage distribution system power capacitor reactive compensation installation, improves power factor of electric network.
(4) description of drawings:
Accompanying drawing 1 is the operation principle structural representation among the present invention's related " based on capacitor switching supervisory control system of single-chip microcomputer and configuration ".
Accompanying drawing 2 is the current/voltage input channel principle schematic among the present invention's related " based on capacitor switching supervisory control system of single-chip microcomputer and configuration ".
Accompanying drawing 3 is the amplification filtering electrical block diagram among the present invention's related " based on capacitor switching supervisory control system of single-chip microcomputer and configuration ".
Accompanying drawing 4 is the special-purpose amplifier architecture schematic diagram among the present invention's related " based on capacitor switching supervisory control system of single-chip microcomputer and configuration ".
Accompanying drawing 6 is the single chip machine controlling circuit structural representation among the present invention's related " based on capacitor switching supervisory control system of single-chip microcomputer and configuration ".
Accompanying drawing 7 is the power drive pipe electrical block diagram among the present invention's related " based on capacitor switching supervisory control system of single-chip microcomputer and configuration ".
Accompanying drawing 8 is the gate level turn-off thyristor electrical block diagram among the present invention's related " based on capacitor switching supervisory control system of single-chip microcomputer and configuration ".
Accompanying drawing 9 is the gate level turn-off thyristor electrical block diagram among the present invention's related " based on capacitor switching supervisory control system of single-chip microcomputer and configuration ".
(5) embodiment:
Embodiment: a kind of capacitor switching supervisory control system (see figure 1) based on single-chip microcomputer and configuration, it is characterized in that it is by being constituted as the configuration system of host computer with as the Single Chip Microcomputer (SCM) system of slave computer, and be connected by serial port with single-chip microcomputer as slave computer as the configuration system of host computer; Said configuration system as host computer is to constitute (see figure 9) by real-time data base and configuration software core; Said Single Chip Microcomputer (SCM) system as slave computer is partly to be made of analog quantity importation, amplification filtering circuit, A/D change-over circuit, microprocessor and storage area, power driving circuit, communication interface; The secondary terminal of said analog quantity importation external impressed current and voltage transformer, the analog quantity output connects the input of amplification filtering circuit, the output of amplification filtering circuit connects the input of A/D change-over circuit, the output of A/D change-over circuit connects the input of microprocessor and storage area, the output of microprocessor and storage area connects power driving circuit, and the output of microprocessor and storage area is connected with host computer by serial communication interface.
Above-mentioned said analog quantity importation (see figure 2) is the sampling system of electric current, voltage, the input of this part connects external voltage instrument transformer summation current transformer, its output connects the input of amplification filtering circuit, and sampling system is delivered to control system by voltage, current transformer after with the voltage of system, current signal digitlization; The 220V phase voltage is directly taken in the voltage input of voltage importation, adopt precision resistance dividing potential drop form to obtain the receptible output voltage of A/D, the electric current importation be three-phase current and neutral current behind external current transformer secondary side as the input variable of this part, adopt current transformer to carry out current transformation, secondary adds precision resistance, current information is converted to the receptible voltage of A/D, all installs electromagnetic compatibility and surge absorbing device during circuit design additional to improve antijamming capability.
Above-mentioned said amplification filtering circuit is used for the current and voltage signals of adopting is amplified, be beneficial to and carry out A/D conversion to reach certain amplitude, can constitute the differential amplifier (see figure 3) by resistance R 1, R2 capacitor C 1, C2, C3, C4, can also adopt meter specially amplifier INA126 (see figure 4).
Above-mentioned said A/D change-over circuit (see figure 5) is used for electric current after the amplification filtering and voltage signal are converted to the manageable digital signal of single-chip microcomputer; The AD7716A/D transducer is the high precision converter of 22 A/D, and its input is the signal after amplifier amplifies, and wherein A/D780 is the low noise precision voltage source, and the A/D that is used for AD7716 transforms reference voltage, and the output voltage of AD780 is an adjustable voltage.
Above-mentioned said microprocessor AT89S8252 and storage area (see figure 6) are made of CPU, clock chip, Flash memory, RAM, switching value input channel, switching value output channel etc.; Voltage, electric current insert the single-chip microcomputer hsi port after the A/D conversion, CPU by single-chip microcomputer carries out the data computation processing, send trigger impulse by the single-chip microcomputer high speed output, this trigger impulse carries out photoelectricity isolation and triode amplification (see figure 7) through power drive pipe circuit, offer the IGBT gate pole input (see figure 8) of gate level turn-off thyristor circuit, the conducting of control thyristor is used for switched capacitor; Clock adopts hardware clock, and the data tape of record has markers, and the Flash memory is used for the data of storage of collected, calculating and statistics; The switching value input then is used for monitoring the input state of capacitor, and the switching value output variable is sent into host computer, is handled by the host computer configuration software.
Above-mentioned said communication interface is provided with the RS232 interface chip MAX232 (see figure 6) of communicating by letter with host computer, system adopts serial ports that signal is transferred to host computer, after serial signal is made level conversion by the MAX232 chip, become the RS232 mouth, this mouth and host computer communicate, accept the instruction of host computer, and the A/D transformation result is transferred to host computer.
Claims (5)
1. capacitor switching supervisory control system based on single-chip microcomputer and configuration, it is characterized in that it is by being constituted as the configuration system of host computer with as the Single Chip Microcomputer (SCM) system of slave computer, and be connected by serial port with Single Chip Microcomputer (SCM) system as slave computer as the configuration system of host computer; Described configuration system as host computer is to be made of real-time data base and configuration software core; Described Single Chip Microcomputer (SCM) system as slave computer is partly to be made of analog quantity importation, amplification filtering circuit, A/D change-over circuit, microprocessor and storage area, power driving circuit, communication interface; The secondary terminal of described analog quantity importation external impressed current instrument transformer and voltage transformer, the analog quantity output connects the input of amplification filtering circuit, the output of amplification filtering circuit connects the input of A/D change-over circuit, the output of A/D change-over circuit connects the input of microprocessor and storage area, the output of microprocessor and storage area connects power driving circuit, and the output of microprocessor and storage area is connected with host computer by serial communication interface; Described microprocessor and storage area are made of CPU, clock chip, Flash memory, RAM, switching value input channel, switching value output channel etc.; Voltage and current through the system after the amplification filtering inserts the single-chip microcomputer hsi port after the A/D conversion, CPU by single-chip microcomputer carries out the data computation processing, send trigger impulse by the single-chip microcomputer high speed output, this trigger impulse carries out photoelectricity isolation and triode amplification through power drive pipe circuit, offer the IGBT gate pole input of gate level turn-off thyristor circuit, the conducting of control thyristor is used for switched capacitor; Clock adopts hardware clock, and the data tape of record has markers, and the Flash memory is used for the data of storage of collected, calculating and statistics; The switching value input then is used for monitoring the input state of capacitor, and the switching value output variable is sent into host computer, is handled by the host computer configuration system.
2. according to the described a kind of capacitor switching supervisory control system of claim 1 based on single-chip microcomputer and configuration, it is characterized in that described analog quantity importation is the sampling system of system power and system voltage, the input of this part connects external voltage instrument transformer summation current transformer, its output connects the input of amplification filtering circuit, and sampling system is delivered to control system by voltage, current transformer after with the voltage of system, current signal digitlization; The 220V phase voltage is directly taken in the voltage input of voltage importation, adopt precision resistance dividing potential drop form to obtain the receptible output voltage of A/D change-over circuit, the electric current importation be three-phase current and neutral current behind external current transformer secondary side as the input variable of this part, adopt current transformer to carry out current transformation, secondary adds precision resistance, current information is converted to the receptible voltage of A/D change-over circuit, all installs electromagnetic compatibility and surge absorbing device during circuit design additional to improve antijamming capability.
3. according to the described a kind of capacitor switching supervisory control system of claim 1 based on single-chip microcomputer and configuration, it is characterized in that described amplification filtering circuit is used for the current and voltage signals of adopting is amplified, be beneficial to and carry out A/D conversion to reach certain amplitude, constitute differential amplifier by filter resistance (R1, R2) and filter capacitor (C1, C2, C3, C4), or adopt instrument amplifier.
4. according to the described a kind of capacitor switching supervisory control system of claim 1, it is characterized in that described A/D change-over circuit is used for electric current after the amplification filtering and voltage signal are converted to the manageable digital signal of single-chip microcomputer based on single-chip microcomputer and configuration; The transducer input is the signal after amplifier amplifies, and wherein the low noise precision voltage source is used for A/D conversion reference voltage, and its output voltage is an adjustable voltage.
5. according to the described a kind of capacitor switching supervisory control system of claim 1 based on single-chip microcomputer and configuration, it is characterized in that described communication interface is provided with serial interface chip and communicates by letter with host computer, system adopts serial ports that signal is transferred to host computer, after serial signal is made level conversion by chip, become serial port, this serial port and host computer communicate, and accept the instruction of host computer, and the A/D transformation result is transferred to host computer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101223008A CN100416968C (en) | 2005-12-12 | 2005-12-12 | Capacitor switching and monitoring system based on single chip microcomputer and configuration |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005101223008A CN100416968C (en) | 2005-12-12 | 2005-12-12 | Capacitor switching and monitoring system based on single chip microcomputer and configuration |
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| CN1801568A CN1801568A (en) | 2006-07-12 |
| CN100416968C true CN100416968C (en) | 2008-09-03 |
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| CNB2005101223008A Expired - Fee Related CN100416968C (en) | 2005-12-12 | 2005-12-12 | Capacitor switching and monitoring system based on single chip microcomputer and configuration |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102916432A (en) * | 2011-08-04 | 2013-02-06 | 沈阳理工大学 | Low-voltage reactive power compensation controller |
| CN102611120B (en) * | 2012-03-27 | 2014-10-15 | 鲁东大学 | Power factor monitoring and compensating system |
| CN113381711A (en) * | 2021-05-25 | 2021-09-10 | 杭州微纳核芯电子科技有限公司 | Power consumption-based self-sensing dynamic charge domain amplifier array capacitance sensing chip |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2206508Y (en) * | 1994-08-28 | 1995-08-30 | 景德明 | Multifunctional protector for electric machine |
| JP2004215277A (en) * | 2003-01-04 | 2004-07-29 | Samsung Electronics Co Ltd | Optical transmission system to enable optimization of bias of laser diode to scm analog optical signal |
| US20050179639A1 (en) * | 2004-02-17 | 2005-08-18 | Kuan-Hong Hsieh | Apparatus and method for simultaneously adjusting brightness and contrast of a display |
| CN2854893Y (en) * | 2005-12-12 | 2007-01-03 | 天津理工大学 | Capacitor switching monitoring device based on single-chip processor and configuration |
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2005
- 2005-12-12 CN CNB2005101223008A patent/CN100416968C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2206508Y (en) * | 1994-08-28 | 1995-08-30 | 景德明 | Multifunctional protector for electric machine |
| JP2004215277A (en) * | 2003-01-04 | 2004-07-29 | Samsung Electronics Co Ltd | Optical transmission system to enable optimization of bias of laser diode to scm analog optical signal |
| US20050179639A1 (en) * | 2004-02-17 | 2005-08-18 | Kuan-Hong Hsieh | Apparatus and method for simultaneously adjusting brightness and contrast of a display |
| CN2854893Y (en) * | 2005-12-12 | 2007-01-03 | 天津理工大学 | Capacitor switching monitoring device based on single-chip processor and configuration |
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