CN201528205U - Low-voltage intelligent reactive power compensation device - Google Patents
Low-voltage intelligent reactive power compensation device Download PDFInfo
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- CN201528205U CN201528205U CN2009202316056U CN200920231605U CN201528205U CN 201528205 U CN201528205 U CN 201528205U CN 2009202316056 U CN2009202316056 U CN 2009202316056U CN 200920231605 U CN200920231605 U CN 200920231605U CN 201528205 U CN201528205 U CN 201528205U
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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
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Abstract
The utility model discloses a low-voltage intelligent reactive power compensation device which comprises a singlechip, a current-voltage detection circuit, a current-voltage mutual inductor, a combination switch and a detection driving circuit thereof, and a circuit breaker, wherein the output end of the current-voltage mutual inductor is connected with the current-voltage detection circuit; the output end of the current-voltage detection circuit is connected with the singlechipe, and used for conveying detected current signals and voltage signals of a system triple-phase line to the singlechip; the output end of the circuit breaker is linked to a capacitor bank and a reactor by the combination switch; the detection driving circuit of the combination switch is connected between the combination switch and the singlechip; and the low-voltage intelligent reactive power compensation device is also provided with a man-machine interface and a communication interface, and inputs and sets system parameters by the man-machine interface. The low-voltage intelligent reactive power compensation device can realize the intelligent control of low-voltage reactive compensation, the non-inrush current and non-electrical arc switch of the reactive capacitor bank, and the comprehensive and reasonable optimization of perception power and interoperability power, and has flexible and convenient use and high reactive compensation efficiency.
Description
Technical field
The utility model relates to a kind of low-voltage intelligent reactive power compensator.
Background technology
In alternating current circuit, there are two kinds by the electrical power of power supply supply load; A kind of is active power, and a kind of is reactive power.Active power is to keep the required electrical power of the normal operation of power consumption equipment, is the electrical power that converts electrical energy into other form energies (mechanical energy, luminous energy, heat energy).Under normal circumstances, power consumption equipment not only will be obtained active power from power supply, also needs simultaneously to obtain reactive power from power supply.If supply falls short of demand for the reactive power in the electrical network, power consumption equipment is not set up normal electromagnetic field with regard to there being enough reactive powers, these power consumption equipments just can not maintain under the specified situation and work, and the terminal voltage of power consumption equipment will descend, thereby influence the normal operation of power consumption equipment.The main method that the method for low-voltage network reactive power compensation improves power factor is to adopt the low-pressure reactive compensation technology, and the method that we adopt usually mainly contains two kinds: random back-off, compensate with device.Random back-off is exactly with secondary capacitor group and motor and connect, by control, protective device and motor switching simultaneously.Random back-off is applicable to the reactive power consumption of compensated motor, and idle to mend excitation, this kind mode is brownout unit's load or burden without work preferably.Be meant with device compensation secondary capacitor is connected on the distribution transformer secondary side by the low pressure insurance, with the unloaded idle compensation way of compensation distribution transformer.The load or burden without work of distribution transforming when underloading or zero load mainly is that the open-circuit excitation of transformer is idle; the distribution transforming zero load is idle to be the major part of using electric unit load or burden without work; for underloaded distribution transforming; the ratio that this part loss accounts for amount of power supply is very big; thereby the increase that causes electricity charge unit price is followed the tracks of compensation and is meant with reactive power compensation switching device as the control protective device, with the compensation way of secondary capacitor group compensation on large user 0.4kv bus.But above two kinds of compensation method underactions can not intelligentized configuration compensation condenser group.
The utility model content
Technical scheme to be solved in the utility model is at above-mentioned the deficiencies in the prior art, and a kind of low-voltage intelligent reactive power compensator is provided.
For solving the problems of the technologies described above, the technical solution adopted in the utility model is: a kind of low-voltage intelligent reactive power compensator comprises single-chip microcomputer, current/voltage testing circuit, current-voltage transformer, combination switch and detection drive circuit and circuit breaker; The output of current-voltage transformer connects the current/voltage testing circuit, and the output of current/voltage testing circuit connects single-chip microcomputer, flows to single-chip microcomputer in order to current signal and voltage signal with detected system triple line; The output of circuit breaker is linked to the capacitor group by combination switch, and the detection drive circuit of combination switch is connected between combination switch and the single-chip microcomputer.
As the further improved technical scheme of the utility model, also comprise the man-machine interface, memory and the communication interface that are connected with single-chip microcomputer respectively; Man-machine interface shows that the system parameters of single-chip microcomputer output is provided with system parameters simultaneously and gives single-chip microcomputer, and set system parameters is stored in the memory simultaneously.Communication interface is used for a plurality of described low-voltage intelligent idle work optimization devices are linked together.
As the further improved technical scheme of the utility model, described device also is provided with temperature sensor, and temperature sensor places in the capacitor group, and the output of temperature sensor connects single-chip microcomputer.
As the further improved technical scheme of the utility model, described current/voltage testing circuit comprises analog switch, amplifying circuit and shaping circuit, analog switch has two-way output, is connected with single-chip microcomputer behind one tunnel connection amplifying circuit, and another road is connected with single-chip microcomputer by shaping circuit.
As the further improved technical scheme of the utility model, the output of described circuit breaker also connects reactor.
The utility model adopts single-chip microcomputer as controller, and by the electric current and the voltage of current-voltage transformer and current/voltage testing circuit detection system triple line, by single-chip microcomputer accurate Calculation quadrature factor, the Single-chip Controlling combination switch is realized operating passing zero simultaneously; In addition, the utility model also is provided with man-machine interface and communication interface, can import and be provided with system parameters by man-machine interface.The utility model has been realized the intellectuality control of low-pressure reactive compensation and no-flashy-flow, no electric arc switching, realizes the comprehensive and reasonable optimization of perceptual power and capacitive power, and is flexible and convenient to use, reactive power compensation efficient height.
Description of drawings
Fig. 1 is a system configuration schematic diagram of the present utility model.
Fig. 2 is sine wave of the present utility model-squaring circuit figure.
Fig. 3 is an amplification circuit diagram of the present utility model.
Fig. 4 is the connection diagram of single-chip microcomputer of the present utility model and sine wave-squaring circuit and amplifying circuit.
Fig. 5 is many schematic diagrames that the low-voltage intelligent reactive power compensator is connected by communication interface.
Embodiment
Below in conjunction with accompanying drawing concrete enforcement side of the present utility model is described further.
Referring to Fig. 1, Fig. 2, Fig. 3 and Fig. 4, a kind of low-voltage intelligent reactive power compensator comprises detection drive circuit, circuit breaker, temperature sensor, man-machine interface, memory and the communication interface of single-chip microcomputer, current-voltage transformer, current/voltage testing circuit, combination switch J1, combination switch J2, combination switch; This low-voltage intelligent reactive power compensator is when work, at first circuit breaker is connected on system's triple line, the wherein two-way of three road outputs of circuit breaker is connected with the capacitor group after connecting combination switch respectively, Third Road directly is connected with the capacitor group, two combination switch J1 are connected with single-chip microcomputer by detecting drive circuit with J2, and it is the single-chip microcomputer of NEC1213 that single-chip microcomputer adopts model; Secondly current-voltage transformer also is installed on system's triple line, the output of current-voltage transformer connects the current/voltage testing circuit, the output of current/voltage testing circuit connects single-chip microcomputer, flows to controller in order to current signal and voltage signal with detected system triple line; Man-machine interface, memory and communication interface are connected with single-chip microcomputer respectively.
Wherein, current-voltage transformer and current/voltage testing circuit are prior art, the current/voltage testing circuit comprises analog switch, absolute value amplifying circuit and shaping circuit, current-voltage transformer is installed on system's triple line, current-voltage transformer becomes in proportion sine wave signal with the electric current of system's triple line with voltage transitions, this sine wave signal has two-way through dividing behind the analog switch, one the tunnel receives the absolute value amplifying circuit, after amplifying signal, the absolute value amplifying circuit delivers to the A/D end of single-chip microcomputer, in order to calculate the size of electric current and voltage, another road is through sine wave-squaring circuit, receive the interruption and the timer port of single-chip microcomputer, in order to the phase difference between calculating electric current and the voltage, and then calculate power factor.Man-machine interface, memory and communication interface also all are prior art, present embodiment is selected a digital display that has keyboard respectively from prior art, eeprom memory and RS485 communication interface, digital display is connected with single-chip microcomputer by its chip for driving, be used for showing the system parameters of single-chip microcomputer output, keyboard on the digital display can the input system parameter be given single-chip microcomputer, the system parameters of input is stored in the eeprom memory simultaneously, when system power is big, a low-voltage intelligent reactive power compensator does not reach the effect of compensation, referring to Fig. 5, just can couple together many low-voltage intelligent reactive power compensators this moment by the RS485 communication interface, realize multi-platform combined work, and only need a table apparatus region measurement power factor and send control signal this moment; Temperature sensor as prior art places in the capacitor group, and the output of temperature sensor directly connects the A/D port of single-chip microcomputer, when temperature is too high, directly cuts off the capacitor group, thus protection and prolong capacitor group useful life; Two combination switch J1 and J2 and drive circuit thereof also are prior aries, it is by the magnetic latching relay of contact-carrying and powerful thyristor and detect drive circuit and form, the detection drive circuit detection of grid voltage of combination switch and the difference voltage of capacitor group, when both are equal, drop into controllable silicon, to have reduced the silicon controlled impact, use magnetic latching relay work during operate as normal, drop into controllable silicon when withdrawing from earlier, cut off magnetic latching relay again, thereby reach no-flashy-flow, no electric arc switching function.
When the power that transmits on the circuit is not equal to natural power, each point voltage then along the line is with offrating, sometimes even depart from bigger, adopt shunt reactor to compensate perception is idle this moment, i.e. shunt reactor on system's triple line, reactor is connected in parallel on system's triple line by combination switch, and single-chip microcomputer output control signal is given combination switch, thereby the switching of control reactor, above-mentioned reactor can adopt magnet controlled reactor; Can reduce the rising of line voltage distribution like this, make the reactive power in-situ balancing as far as possible in the light hours circuit, prevent that the unreasonable mobile while of reactive power from also having alleviated the power loss on the circuit.
Present embodiment utilizes instantaneous reactive power theory and fourier algorithm, can be under the situation of higher harmonics, thus accurate Calculation network system parameter and realize reactive power compensation by the switching that the Single-chip Controlling combination switch is finished the capacitor group.According to the load actual conditions; system parameters as: CT ratio, switching delay time, voltage upper lower limit value, electric capacity protection temperature, the target power factor all can be by the keyboard setting; all parameters all are kept among the outside EEROM, even power down can not lost yet, operation automatically powers on.There is deviation at system's 5V reference voltage in addition, fine-tuning by keyboard, thus realize measuring more accurately.
Claims (5)
1. a low-voltage intelligent reactive power compensator is characterized in that corresponding device comprises: single-chip microcomputer, current/voltage testing circuit, current-voltage transformer, combination switch and detection drive circuit and circuit breaker; The output of current-voltage transformer connects the current/voltage testing circuit, and the output of current/voltage testing circuit connects single-chip microcomputer, flows to single-chip microcomputer in order to current signal and voltage signal with detected system triple line; The output of circuit breaker is connected to the capacitor group by combination switch, and the detection drive circuit of combination switch is connected between combination switch and the single-chip microcomputer.
2. low-voltage intelligent reactive power compensator according to claim 1 is characterized in that: also comprise the man-machine interface, memory and the communication interface that are connected with single-chip microcomputer respectively; Man-machine interface shows that the system parameters of single-chip microcomputer output is provided with system parameters simultaneously and gives single-chip microcomputer, and set system parameters is stored in the memory simultaneously; Communication interface links together a plurality of described low-voltage intelligent idle work optimization devices.
3. low-voltage intelligent reactive power compensator according to claim 1 is characterized in that: described device also is provided with temperature sensor, and temperature sensor places in the capacitor group, and the output of temperature sensor connects single-chip microcomputer.
4. according to claim 1 or 2 or 3 described low-voltage intelligent reactive power compensators, it is characterized in that: described current/voltage testing circuit comprises analog switch, amplifying circuit and shaping circuit, analog switch has two-way output, be connected with single-chip microcomputer behind one tunnel connection amplifying circuit, another road is connected with single-chip microcomputer by shaping circuit.
5. according to claim 1 or 2 or 3 described low-voltage intelligent reactive power compensators, it is characterized in that: the output of described circuit breaker also connects reactor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202316056U CN201528205U (en) | 2009-09-16 | 2009-09-16 | Low-voltage intelligent reactive power compensation device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202316056U CN201528205U (en) | 2009-09-16 | 2009-09-16 | Low-voltage intelligent reactive power compensation device |
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| CN201528205U true CN201528205U (en) | 2010-07-14 |
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| CN2009202316056U Expired - Fee Related CN201528205U (en) | 2009-09-16 | 2009-09-16 | Low-voltage intelligent reactive power compensation device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101976822A (en) * | 2010-10-19 | 2011-02-16 | 栾银山 | Novel power capacitor |
| CN102148505A (en) * | 2011-04-25 | 2011-08-10 | 北京都市鼎点科技有限公司 | Reactive compensation controller |
| CN102967826A (en) * | 2012-11-05 | 2013-03-13 | 中国电力科学研究院 | Test method for electric endurance of switching capacitor set beaker of extra-high voltage project |
| CN103326381A (en) * | 2013-07-19 | 2013-09-25 | 江苏南自通华电力自动化有限公司 | Low-power-consumption rapid capacitor switching switch with intelligent control |
| CN108879710A (en) * | 2018-06-08 | 2018-11-23 | 贵州电网有限责任公司凯里供电局 | A kind of power distribution network efficiency optimization device and method using reactive compensation |
-
2009
- 2009-09-16 CN CN2009202316056U patent/CN201528205U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101976822A (en) * | 2010-10-19 | 2011-02-16 | 栾银山 | Novel power capacitor |
| CN102148505A (en) * | 2011-04-25 | 2011-08-10 | 北京都市鼎点科技有限公司 | Reactive compensation controller |
| CN102967826A (en) * | 2012-11-05 | 2013-03-13 | 中国电力科学研究院 | Test method for electric endurance of switching capacitor set beaker of extra-high voltage project |
| CN102967826B (en) * | 2012-11-05 | 2015-05-13 | 中国电力科学研究院 | Test method for electric endurance of switching capacitor set beaker of extra-high voltage project |
| CN103326381A (en) * | 2013-07-19 | 2013-09-25 | 江苏南自通华电力自动化有限公司 | Low-power-consumption rapid capacitor switching switch with intelligent control |
| CN108879710A (en) * | 2018-06-08 | 2018-11-23 | 贵州电网有限责任公司凯里供电局 | A kind of power distribution network efficiency optimization device and method using reactive compensation |
| CN108879710B (en) * | 2018-06-08 | 2022-03-04 | 贵州电网有限责任公司 | Power distribution network energy efficiency optimization device and method adopting reactive compensation |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100714 Termination date: 20120916 |