CN103840475A - Stepless compensating device and method - Google Patents
Stepless compensating device and method Download PDFInfo
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- CN103840475A CN103840475A CN201410089216.XA CN201410089216A CN103840475A CN 103840475 A CN103840475 A CN 103840475A CN 201410089216 A CN201410089216 A CN 201410089216A CN 103840475 A CN103840475 A CN 103840475A
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
Abstract
The invention discloses a stepless compensating device which mainly comprises a filter, a signal collecting plate, an inversion plate, a control plate and a PWM pulse driving plate. Meanwhile, the invention discloses a stepless compensating method. An FPGA chip is used as a core element, a real-time data collecting technology and a dynamic tracking technology are used for monitoring the electric energy quality of a power distribution system in real time, through a monitoring system, a series of electric energy quality data such as system voltages, frequency, loading currents, THDi, THDu, voltage waveform, current waveform, stepless compensating device output current magnitude and waveform can be checked in real-time, the idle current magnitude output by the device is changed continuously through an inversion circuit, quick and continuous idle power compensating is achieved, through the method, idle currents are compensated timely, and the whole structure has the advantages of being scientific, reasonable, advanced in technology, timely in compensating, high in stability, high in cost performance and the like.
Description
Technical field
The present invention relates to a kind of quick continuous reactive power compensation device and the method for utilizing this device to carry out stepless compensation, specifically, refer to a kind of stepless compensation arrangement and stepless compensation method.
Background technology
Traditional reactive power compensator adopts power electronics and single-chip microcomputer control technology to realize automatic control to shunt capacitor, realizes the switching control to Shunt Capacitor Unit.Tradition compensation arrangement switching device is contactor or thyristor, can freely assemble output way, but contactor and thuristor throw-in and throw-off compensation way opening-closing capacitor bank are grouping switching, idle output capacity is step, compensation capacity can not continuous setup, be difficult to reach and System Reactive Power complete equipilibrium, easily caused and mend or owe the situation of mending, the power factor after compensation is generally in 0.8-0.9 left and right.
Contactor is mechanical devices, can not respond fast, can not be fast switching continuously, so the switching time be generally made as 5～60 seconds; The triggering mode of thyristor is zero cross fired, and the switching response time needs 10 milliseconds at the soonest.Owing to adopting capacitor group as reactive power compensation device, continuous switching fast, to the load variations time, the equipment of short (as electric welding machine, spot welding machine, numerical control press etc.) does not possess compensation ability.
Existing static reacance generator (SVG) is though there is fast response time, and individual module compensation capacity is little.Need multiple module parallel operation compensation for slightly large electric power system, user drops into huge, and cost performance is too low.
Summary of the invention
The object of the present invention is to provide a kind of stepless compensation arrangement and stepless compensation method, can overcome above-mentioned defect, equipment adopts the quality of power supply of Real-time Data Acquisition Technology and Dynamic Tracing Technology Real-Time Monitoring distribution system taking fpga chip as core parts, pass through supervisory control system, can watch in real time system voltage, frequency, load current, THDi, THDu, voltage waveform, current waveform and stepless compensation arrangement output current size, a series of power quality datas such as waveform, the reactive current size that continuously changes device output through inverter circuit has again realized quick continuous reactive power compensation.
The present invention is achieved through the following technical solutions:
A kind of stepless compensation arrangement, mainly by forming with lower component:
Filtering, signal acquiring board: mainly formed by filter circuit and signal amplification shaping circuit, described filter circuit is connected with distribution system, filter circuit is for the high frequency carrier of the stepless compensation arrangement output current of filtering, and signal amplification shaping circuit is used for receiving mains voltage signal and current signal and signal is amplified to shaping;
Inversion plate: mainly formed by IGBT inverter circuit, be connected with filter circuit, for the transformation between direct current and alternating current;
Control board: be mainly made up of FPGA main control chip, described FPGA main control chip is also connected with A/D conversion chip, and described A/D conversion chip is connected with signal amplification shaping circuit, control board sends control information for receiver voltage current signal output order;
Pwm pulse drive plate: mainly formed by pwm pulse drive circuit, be connected with FPGA main control chip, IGBT inverter circuit, the pwm pulse sending for receiving FPGA main control chip, and be amplified to the required drive level of IGBT, for driving IGBT power device.
Further, for realizing better the present invention, also comprise relay expansion board, described relay expansion board is mainly made up of relay, and described relay is connected with FPGA main control chip.
Further, for realizing better the present invention, described relay is also connected with capacitor group.
Further, for realizing better the present invention, described FPGA main control chip is also connected with communication interface.
Further, for realizing better the present invention, described FPGA main control chip is also connected with LCD interface.
Further, for realizing better the present invention, described main control chip is selected FPGA.
The present invention, on a kind of basis of stepless compensation arrangement, has proposed a kind of stepless compensation method, comprises the following steps:
(1) signal amplification shaping circuit receives mains voltage signal and current signal, and signal is amplified to shaping and the A/D conversion chip that sends signal in control board carries out analog-to-digital conversion;
(2) FPGA main control chip reads digital signal, and digital signal is carried out to quantification treatment, digital filtering, amplitude limiting processing;
(3) FPGA main control chip carries out idle analysis to the signal of the amplitude limiting processing in step (2), obtains reactive current signal;
(4) FPGA main control chip is done to use pulse-width modulation PWM signal form to IGBT inverter circuit transmitted signal after anti-phase processing to the reactive current signal in step (3), controls IGBT inverter circuit switching device;
(5) direct current is converted to alternating current by IGBT inverter circuit;
(6) after the high frequency carrier in filter circuit filtering output current, generation equates with load reactive current amplitude, opposite polarity offset current;
(7) FPGA main control chip detects output current, load reactive power, in the time that output current is greater than set point or reactive power and is greater than set point, main control chip control relay drops into fixed capacity capacitor to meet load reactive requirement, realizes the stepless compensation of large capacity.
The present invention compared with prior art, has following beneficial effect:
(1) the present invention, by adopting FPGA control chip control reacance generator, can accelerate its reaction speed, and Reaction time shorten, realizes continuous reactive power compensation fast;
(2) the present invention by simultaneously to the idle phase splitting compensation of three-phase imbalance, allows each phase power factor all remain on optimum state, time existing balance three-phase activity coefficient;
(3) the present invention compensates by real time stepless, can realize fine compensation, improves the power factor after compensation;
(4) the present invention has the FPGA main control chip of superelevation reaction speed and operating frequency by employing utilization, the data processing circuit building therein through hardware programming carries out quantification treatment to sampled data, digital filtering, amplitude limiting processing, after idle analyzing and processing and with pulse-width modulation PWM signal form, send driving pulse to offset current circuit for generating, drive IGBT inverter circuit, generate and equate with load reactive current amplitude, opposite polarity offset current injects electrical network, power system reactive power is compensated timely, total has scientific and reasonable, advanced technology, compensation in time, stability is high, cost performance high.
Brief description of the drawings
Fig. 1 is intelligent stepless compensation arrangement theory diagram of the present invention;
Fig. 2 is intelligent stepless compensation arrangement fpga chip internal frame diagram of the present invention.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited to this.
Embodiment 1:
As shown in Figure 1 and Figure 2, a kind of stepless compensation arrangement, mainly by forming with lower component:
Filtering, signal acquiring board: mainly formed by filter circuit and signal amplification shaping circuit, described filter circuit is connected with distribution system, filter circuit is for the high frequency carrier of the stepless compensation arrangement output current of filtering, and signal amplification shaping circuit is used for receiving mains voltage signal and current signal and signal is amplified to shaping;
Inversion plate: mainly formed by IGBT inverter circuit, be connected with filter circuit, for the transformation between direct current and alternating current;
Control board: be mainly made up of FPGA main control chip, described FPGA main control chip is also connected with A/D conversion chip, and described A/D conversion chip is connected with signal amplification shaping circuit, control board sends control information for receiver voltage current signal output order;
Pwm pulse drive plate: mainly formed by pwm pulse drive circuit, be connected with FPGA main control chip, IGBT inverter circuit, the pwm pulse sending for receiving FPGA main control chip, and be amplified to the required drive level of IGBT, for driving IGBT power device.
Gather three phase network voltage by equipment, load current, carry out by signal amplification shaping circuit the A/D conversion chip that signal amplifies and shaping is input in control board afterwards and carry out analog-to-digital conversion, digital signal after analog-to-digital conversion is sent to FPGA main control chip, after FPGA main control chip receiving digital signals, carry out quantification treatment, digital filtering, amplitude limiting processing, idle analysis, idle analysis result produces circuit evolving PWM modulating pulse by PWM and outputs to pwm pulse drive plate, pulse signal is amplified to the required level of IGBT by pwm pulse drive circuit, through inversion plate IGBT inverter circuit, direct current is converted to alternating current, after high frequency carrier in circuit filtering output current, inject electrical network after filtering.While data are after treatment delivered to innernal CPU by data/address bus, and the CPU operation in advance program of establishment is sent to PORT COM after data are processed.Due to Real-time Collection line voltage, load current, continuously change the reactive current size of device output according to load reactive power, thereby realize the stepless compensation of reactive power.
Owing to adopting fpga chip as core parts, adopt Real-time Data Acquisition Technology and Dynamic Tracing Technology to detect in real time the quality of power supply of distribution system, can accelerate the reaction speed of device, Reaction time shorten, compensate real-time sudden change is idle, by to the idle phase splitting compensation of three-phase imbalance, can realize fine compensation simultaneously, improve system power factor.
Embodiment 2:
For realizing better the present invention, be convenient to be switched to other equipment in the time reaching setting capacity, as shown in Figure 1, the present embodiment is on the basis of embodiment 1, also comprise relay expansion board, described relay expansion board is mainly made up of relay, and described relay is connected with FPGA main control chip.In the time that load reactive power is greater than compensation arrangement setting compensation capacity, by adopting relay output, can drop into other compensation equipment, to reduce compensation arrangement output current.Other parts of the present embodiment are identical with embodiment 1, repeat no more.
Embodiment 3:
For realizing better the present invention, the present embodiment is on the basis of embodiment 2, and described relay is also connected with capacitor group.By adopting the mode that is connected with capacitor group of relay, can adopt capacitor group is grouping switching, exports reactive capability, realizes being connected mutually of this device and legacy equipment, and then has increased the scope of application of this device.Other parts of the present embodiment are identical with embodiment 2, repeat no more.
Embodiment 4:
For realizing better the present invention, to be convenient to be connected with other control terminals, the present embodiment is on the basis of embodiment 1, and described FPGA main control chip is also connected with communication interface.By communication interface is set, can be connected with FPGA main control chip by other control terminals, thereby realize long-range or other intelligent control modes.Other parts of the present embodiment are identical with embodiment 1, repeat no more.
Embodiment 5:
For realizing better the present invention, to be convenient to staff and to understand in real time system data, the present embodiment is on the basis of embodiment 1, and described FPGA main control chip is also connected with LCD interface.By LCD interface is set, staff can be connected to display device or other man-machine switching equipment in compensation arrangement PORT COM when needed, can show in real time offset data, is convenient to staff and intuitively understands working condition.Other parts of the present embodiment are identical with embodiment 1, repeat no more.
Embodiment 6:
For realizing better the present invention, the present embodiment is on the basis of above-described embodiment, and described main control chip is selected FPGA.Adopt field programmable gate array, it is the product further developing on the basis of the programming devices such as PAL, GAL, CPLD.It occurs as a kind of semi-custom circuit in application-specific integrated circuit (ASIC) (ASIC) field, has both solved the deficiency of custom circuit, has overcome again the limited shortcoming of original programming device gate circuit number.Other parts of the present embodiment are same as the previously described embodiments, repeat no more.
Embodiment 7:
The present embodiment, on a kind of basis of stepless compensation arrangement, has proposed a kind of stepless compensation method, comprises the following steps:
(1) signal amplification shaping circuit sampling mains voltage signal and current signal, amplifies shaping and the A/D converter that sends signal in control board carries out analog-to-digital conversion to signal;
(2) FPGA main control chip reads digital signal, and digital signal is carried out to quantification treatment, digital filtering, amplitude limiting processing;
(3) FPGA main control chip carries out idle analysis to the signal of the amplitude limiting processing in step (2), obtains reactive current;
(4) FPGA main control chip to the reactive current signal inversion in step (3) after by pulse-width modulation PWM impulse form to IGBT inverter circuit transmitted signal, control IGBT inverter circuit switching device;
(5) direct current is converted to alternating current by IGBT inverter circuit;
(6) high frequency carrier in the stepless compensation arrangement output current of filter circuit filtering, generation equates with load reactive current amplitude, opposite polarity offset current.
By adopting the method to compensate timely reactive current, that total has is scientific and reasonable, advanced technology, compensation is timely, stability is high, cost performance high.
The above, be only preferred embodiment of the present invention, not the present invention done to any pro forma restriction, and any simple modification, equivalent variations that every foundation technical spirit of the present invention is done above embodiment, within all falling into protection scope of the present invention.
Claims (7)
1. a stepless compensation arrangement, is characterized in that comprising: mainly by forming with lower component:
Filtering, signal acquiring board: mainly formed by filter circuit and signal amplification shaping circuit, described filter circuit is connected with distribution system, filter circuit is for the high frequency carrier of the stepless compensation arrangement output current of filtering, and signal amplification shaping circuit is used for receiving mains voltage signal and current signal and signal is amplified to shaping;
Inversion plate: mainly formed by IGBT inverter circuit, be connected with filter circuit, for the transformation between direct current and alternating current;
Control board: be mainly made up of FPGA main control chip, described FPGA main control chip is also connected with A/D conversion chip, and described A/D conversion chip is connected with signal amplification shaping circuit, control board sends control information for receiver voltage current signal output order;
Pwm pulse drive plate: mainly formed by pwm pulse drive circuit, be connected with FPGA main control chip, IGBT inverter circuit, the pwm pulse sending for receiving FPGA main control chip, and be amplified to the required drive level of IGBT, for driving IGBT power device.
2. the stepless compensation arrangement of one according to claim 1, is characterized in that: also comprise relay expansion board, described relay expansion board is mainly made up of relay, and described relay is connected with FPGA main control chip.
3. the stepless compensation arrangement of one according to claim 2, is characterized in that: described relay is also connected with capacitor group.
4. the stepless compensation arrangement of one according to claim 1, is characterized in that: described FPGA main control chip is also connected with communication interface.
5. the stepless compensation arrangement of one according to claim 1, is characterized in that: described FPGA main control chip is also connected with LCD interface.
6. according to the stepless compensation arrangement of one described in claim 1-5 any one, it is characterized in that: described main control chip is selected FPGA.
7. a stepless compensation method, is characterized in that: comprise the following steps:
(1) signal amplification shaping circuit receives mains voltage signal and current signal, and signal is amplified to shaping and the A/D conversion chip that sends signal in control board carries out analog-to-digital conversion;
(2) FPGA main control chip reads digital signal, and digital signal is carried out to quantification treatment, digital filtering, amplitude limiting processing;
(3) FPGA main control chip carries out idle analysis to the signal of the amplitude limiting processing in step (2), obtains reactive current signal;
(4) FPGA main control chip is done to use pulse-width modulation PWM signal form to IGBT inverter circuit transmitted signal after anti-phase processing to the reactive current signal in step (3), controls IGBT inverter circuit switching device;
(5) direct current is converted to alternating current by IGBT inverter circuit;
(6) after the high frequency carrier in filter circuit filtering output current, generation equates with load reactive current amplitude, opposite polarity offset current;
(7) FPGA main control chip detects output current, load reactive power, in the time that output current is greater than set point or reactive power and is greater than set point, main control chip control relay drops into fixed capacity capacitor to meet load reactive requirement, realizes the stepless compensation of large capacity.
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| CN201410089216.XA CN103840475A (en) | 2014-03-12 | 2014-03-12 | Stepless compensating device and method |
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Cited By (5)
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| CN105414731A (en) * | 2016-01-05 | 2016-03-23 | 佛山市南海铧圣通焊接设备厂 | Spot welding machine control system |
| CN105470977A (en) * | 2015-12-30 | 2016-04-06 | 国网浙江余姚市供电公司 | Novel fixed reactive compensation device |
| CN105977998A (en) * | 2016-07-05 | 2016-09-28 | 江西仪能新能源微电网协同创新有限公司 | Large power static var compensator based on SOPC and IGCT |
| CN106786658A (en) * | 2017-01-22 | 2017-05-31 | 浙江九社电气有限公司 | The stepless compensation circuit of power system reactive power and compensation method |
| CN112003802A (en) * | 2020-06-19 | 2020-11-27 | 浙江华云信息科技有限公司 | Coding system and method using reactive current pulse |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105470977A (en) * | 2015-12-30 | 2016-04-06 | 国网浙江余姚市供电公司 | Novel fixed reactive compensation device |
| CN105414731A (en) * | 2016-01-05 | 2016-03-23 | 佛山市南海铧圣通焊接设备厂 | Spot welding machine control system |
| CN105414731B (en) * | 2016-01-05 | 2018-05-11 | 佛山市南海铧圣通焊接设备厂 | Mash welder control system |
| CN105977998A (en) * | 2016-07-05 | 2016-09-28 | 江西仪能新能源微电网协同创新有限公司 | Large power static var compensator based on SOPC and IGCT |
| CN106786658A (en) * | 2017-01-22 | 2017-05-31 | 浙江九社电气有限公司 | The stepless compensation circuit of power system reactive power and compensation method |
| CN112003802A (en) * | 2020-06-19 | 2020-11-27 | 浙江华云信息科技有限公司 | Coding system and method using reactive current pulse |
| CN112003802B (en) * | 2020-06-19 | 2023-09-19 | 浙江华云信息科技有限公司 | Coding system and method using reactive current pulse |
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Application publication date: 20140604 |