CN104967129A - Non-polar variable capacitance type intelligent capacitor - Google Patents
Non-polar variable capacitance type intelligent capacitor Download PDFInfo
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- CN104967129A CN104967129A CN201510057200.5A CN201510057200A CN104967129A CN 104967129 A CN104967129 A CN 104967129A CN 201510057200 A CN201510057200 A CN 201510057200A CN 104967129 A CN104967129 A CN 104967129A
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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 non-polar variable capacitance type intelligent capacitor. The non-polar variable capacitance type intelligent capacitor comprises an input loop, a switch power supply, a voltage inversion transformation circuit, a UPQC control system and an output loop which are successively connected, wherein the input end of the voltage inversion transformation circuit is connected with the output end of the input loop and is connected in parallel with the switch power supply. According to the invention, voltage transformation is carried out according to the actual shortage condition of reactive power of a power network by use of UPQC principle, voltage transformation values are superposed on a capacitor for realizing end voltage change so as to enable the capacity of the capacitor to generate capacitance change, through non-polar adjustment of end voltage of the capacitor, non-polar adjustment of the capacitor is realized, and voltage change generated when the capacitor is switched into the power network does not affect application of a load in the same power network.
Description
Technical field
The present invention relates to intelligent grid electric and electronic technical field, particularly related in a kind of electrical network and solved reactive power defect and regulated by electrodeless change, meet the electrodeless variable displacement type Intelligent capacitor of one realizing reactive power power needs.
Background technology
Utilize power electronic technology in current intelligent grid, solving reactive power compensation scheme has parallel reactive power compensating device, and device is mainly that core devices is to complete certain reactive power compensation with self healing capacitor.Thisly realize compensation with shunt capacitor and there is following problem:
1, capacitance compensation can only compensate fixing idle, although adopt electric capacity grouping switching to compare fixed capacitor compensation way more effectively can adapt to the idle dynamic change of load.
2, capacitor compensation mode still belongs to a kind of Reactive-power control having level, can not realize idle smoothly stepless adjustment.Capacitor can only regulate and switching by state's deciding grade and level number, can not realize real-time voltage adjustment and meet Reactive Power Compensation in real time demand, cause reactive power releasing problem.Reactive power releasing is unallowed in electric power system, and particularly when load valley, reactive power releasing causes voltage higher.
3, to separate unit reactive power compensator, demand specification capacitor not of the same race has the Reactive-power control of level, concerning complex structure device body design, bulky, causes separate unit cabinet manufactured materials to increase, thus high cost.
4, the device using multiple stage capacitance group net to be formed reaches certain reactive power compensation amount, device install capacitor time because of capacitor number more, concrete installation wiring is complicated, causes time cost to waste multiple stage construction system simultaneously, and the auxiliary material waste between platform and platform is a lot.
6, harmonic problem.Capacitor has certain anti-harmonic wave ability, but can have an impact to the life-span of capacitor when harmonic content is excessive, even causes the premature breakdown of capacitor; And because couple capacitors harmonic wave has amplification, the humorous wave interference thus making system is more serious, the compensation arrangement that multiple stage networking is formed, harmonic current can more every platform electric capacity this amplify, cause harmonic oscillation frequency complicated, serious harm electrical network.
Summary of the invention
For the deficiency that prior art exists, object of the present invention just there are provided a kind of electrodeless variable displacement type Intelligent capacitor, effectively can solve single capacitor and realize electrodeless transfiguration, effectively microelectric technique and capacitor be combined and realize intelligent compensation and the compensation that becomes more meticulous.
To achieve these goals, the technical solution used in the present invention is such: a kind of electrodeless variable displacement type Intelligent capacitor, comprise the input circuit, Switching Power Supply, voltage inversion translation circuit, UPQC control system, the output loop that connect successively, the input of described voltage inversion translation circuit is connected with the output of input circuit also and switch power parallel; Utilize UPQC principle and exchange DC and AC transfer principle and realize between electrical network and sensitive load, be equivalent to a controlled voltage source, the voltage of any amplitude, phase place and waveform can be produced, by this voltage superposition on intelligent electric power electric capacity.
As a kind of preferred version, described input circuit comprises input filtering loop, and described input filtering loop comprises differential mode inhibitor and common mode inhibitor.
As a kind of preferred version, described Switching Power Supply includes high frequency transformer and power management chip, and the high frequency transformation of described high frequency transformer is elementary to be connected with the input power of input circuit, high frequency transformation is secondary is connected with power management chip; Described Switching Power Supply is that whole capacitor is powered, and realizes Multiple isolated outputs.
As a kind of preferred version, described voltage inversion translation circuit comprises AC-DC-AC change-over circuit and power conversion circuit; For completing the conversion of voltage.
As a kind of preferred version, described UPQC control system adopts UPQC controller; For realizing the process of change in voltage control and inactivity and harmonic content.
As a kind of preferred version, described output loop comprises output filtering loop, feedback loop, and output filtering loop comprises linked reactor; The input of described feedback circuit is connected with output filtering loop, output is connected with power conversion circuit through transmission circuit; Capacitor is carried by linked reactor, and the capacity realized after electric capacity transfiguration is transported on the electrical network of needs compensation.
As a kind of preferred version, described output loop is parallel with protective circuit.
Compared with prior art, beneficial effect of the present invention:
1. dynamic passive compensation support is provided, improves power factor, realize electrodeless transfiguration;
2. the harmonic current of filtering user injected system, harmonic number can set according to demand;
3. voltage dip, the temporarily liter of pair system compensate;
4. suppress the harmonic voltage component in supply power voltage, suppress voltage fluctuation;
5. compensating three-phase unbalance electric current;
6. cost declines to a great extent, as: 240kvar, the market price about 2.4 ten thousand, cost of the present invention is: 6000 yuan;
7. structure is simple, capacity is large, can electrodeless transfiguration, achieves Reactive Power Compensation in real time to ensure the continous-stable of power system voltage, can Reactive Power Compensation in real time, Optimum Reactive Power Flow distributes, and controls in real time, to realize being converted into real-time process from processed offline to electric network reactive compensation and voltage optimization, improve each node voltage qualification rate of the whole network, reduce network loss, obtain good economy, greatly reduce production cost.
Accompanying drawing explanation
Fig. 1 is structured flowchart of the present invention;
Fig. 2 is circuit theory diagrams of the present invention;
Fig. 3 is the equivalent electric circuit of UPQC control system in the present invention.
Embodiment
Below with reference to specific embodiment, technical scheme provided by the invention is described in detail, following embodiment should be understood and be only not used in for illustration of the present invention and limit the scope of the invention.
Embodiment:
As shown in Figure 1, a kind of electrodeless variable displacement type Intelligent capacitor, comprise the input circuit 1, Switching Power Supply 2, voltage inversion translation circuit 3, UPQC control system 4, the output loop 5 that connect successively, the input of described voltage inversion translation circuit is connected with the output of input circuit also and switch power parallel; Described input circuit comprises input filtering loop 11, and described input filtering loop 11 comprises differential mode inhibitor 111 and common mode inhibitor 112; Described Switching Power Supply 2 includes high frequency transformer 21 and power management chip 22, and the high frequency transformation of described high frequency transformer 21 is elementary to be connected with the input power of input circuit 1, high frequency transformation is secondary is connected with power management chip 22; Described voltage inversion translation circuit 3 comprises AC-DC-AC change-over circuit 31 and power conversion circuit 32; Described UPQC control system 4 adopts UPQC controller; Described output loop 5 comprises output filtering loop 51, feedback loop 52, and output filtering loop 51 comprises linked reactor 511; The input of described feedback circuit 52 is connected with output filtering loop 51, output is connected with power conversion circuit 32 through transmission circuit 6; Described output loop 5 is parallel with protective circuit 7.
Circuit theory diagrams as shown in Figure 2, described differential mode inhibitor 111 and common mode inhibition device 112 are connected on leading-out terminal on air switch (sky namely in figure is opened) lead-in wire, linked reactor 511 is before capacitor, during concrete enforcement, line voltage is through input circuit 1, input circuit 1 is after the air switch of electrical network duplexure, voltage through differential mode inhibitor 111 filtering electrical network low-frequency disturbance and when normally working with electrical network frequency departure interference signal after be added on common mode inhibition device 112, to be added on Switching Power Supply 2 and voltage inversion translation circuit 3 with voltage after amplitude disturbing wave filtering frequently by common mode inhibition device 112 simultaneously, Switching Power Supply 2 completes the working power that output provides each several part circuit to need respectively, and voltage inversion translation circuit 3 draws the idle voltage occurrence needing to be superimposed upon above capacitor that provides that electrical network needs in real time after completing Power Processing according to the UPQC controller of UPQC control system 4, feed back to voltage inversion translation circuit 3, voltage inversion translation circuit 3 has AC-DC-AC change-over circuit 31 to complete capacitor transfiguration required voltage by inside, this voltage superposition is to capacitor, capacitor capacitance changes, the capacitance of change is being transported to electrical network by linked reactor 511, complete the compensation of the inactivity that electrical network lacks.
Wherein UPQC controls and exchanges DC and AC to convert between electrical network and sensitive load, is equivalent to a controlled voltage source, can produces the voltage of any amplitude, phase place and waveform.As shown in Figure 3, this structure is three-phase three-wire system structure to the equivalent electric circuit of UPQC part in series.In Fig. 3
represent voltage on line side,
represent three-phase circuit electric current,
represent the equiva lent impedance of net side,
represent the output voltage of UPQC part in series,
represent load impedance; As shown in Figure 3:
, wherein
for the voltage of load, because the object controlled is for keeping
constant, so the electric current in circuit
can regard as constant, therefore
for constant value.When the voltage of net side
when changing, just can by changing the voltage of UPQC part in series
, thus make load voltage
keep constant.
Due to the non-linear of power electronic device and the non-sinusoidal feature of waveform, the electric current of the mains side (net side) of the electric drive automation equipment be made up of power electronic device is not only containing first-harmonic, also comprise abundant harmonic wave, electric-control system power factor during whole service is on the low side, general between 0.2-0.8, start reactive power impact large simultaneously, line voltage is caused to fluctuate, these bring bad impact all can to the operation of electrical network and efficiency, simultaneously other power consumption equipment bands that also can be docked in this utility network are served bad impact and are even endangered, Unified Power Quality Controller, i.e. UPQC controller, the size of reactive compensation power can be regulated by quick and smooth, dynamic voltage support is provided, the runnability of improvement system.Under system is short-circuited failure condition, the dynamic reactive regulating power of UPQC controller can accelerate the recovery process of internal condition after failure removal; In load variations situation, UPQC controller can make the voltage fluctuation of electrical network obviously reduce, and runs and regulated power quality all has good effect to process equipment and substation safety.
Finally it should be noted that, above embodiment is only in order to illustrate technical scheme of the present invention and non-limiting technical scheme, those of ordinary skill in the art is to be understood that, those are modified to technical scheme of the present invention or equivalent replacement, and do not depart from aim and the scope of the technical program, all should be encompassed in the middle of right of the present invention.
Claims (7)
1. an electrodeless variable displacement type Intelligent capacitor, it is characterized in that: comprise the input circuit, Switching Power Supply, voltage inversion translation circuit, UPQC control system, the output loop that connect successively, the input of described voltage inversion translation circuit is connected with the output of input circuit and and switch power parallel.
2. the electrodeless variable displacement type Intelligent capacitor of one according to claim 1, is characterized in that: described input circuit comprises input filtering loop, and described input filtering loop comprises differential mode inhibitor and common mode inhibitor.
3. the electrodeless variable displacement type Intelligent capacitor of one according to claim 1, it is characterized in that: described Switching Power Supply includes high frequency transformer and power management chip, the high frequency transformation of described high frequency transformer is elementary to be connected with the input power of input circuit, high frequency transformation is secondary is connected with power management chip.
4. the electrodeless variable displacement type Intelligent capacitor of one according to claim 1, is characterized in that: described voltage inversion translation circuit comprises AC-DC-AC change-over circuit and power conversion circuit.
5. the electrodeless variable displacement type Intelligent capacitor of one according to claim 1, is characterized in that: described UPQC control system adopts UPQC controller.
6. the electrodeless variable displacement type Intelligent capacitor of one according to claim 4, it is characterized in that: described output loop comprises output filtering loop, feedback loop, and output filtering loop comprises linked reactor; The input of described feedback circuit is connected with output filtering loop, output is connected with power conversion circuit through transmission circuit.
7., according to claim 1 or the electrodeless variable displacement type Intelligent capacitor of one according to claim 4, it is characterized in that: described output loop is parallel with protective circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510057200.5A CN104967129A (en) | 2015-02-04 | 2015-02-04 | Non-polar variable capacitance type intelligent capacitor |
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| CN201510057200.5A CN104967129A (en) | 2015-02-04 | 2015-02-04 | Non-polar variable capacitance type intelligent capacitor |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101807799A (en) * | 2010-04-27 | 2010-08-18 | 天津大学 | Super capacitor energy storage type power quality compensator |
| CN201674271U (en) * | 2010-03-16 | 2010-12-15 | 杭州金兰达科技有限公司 | Special electricity saving device for injection molding oil pump motor |
| US20120086412A1 (en) * | 2009-04-09 | 2012-04-12 | Filippo Chimento | Arrangement For Exchanging Power |
| CN204517409U (en) * | 2015-02-04 | 2015-07-29 | 江苏嘉宇电气科技有限公司 | Electrodeless variable displacement type Intelligent capacitor |
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2015
- 2015-02-04 CN CN201510057200.5A patent/CN104967129A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120086412A1 (en) * | 2009-04-09 | 2012-04-12 | Filippo Chimento | Arrangement For Exchanging Power |
| CN201674271U (en) * | 2010-03-16 | 2010-12-15 | 杭州金兰达科技有限公司 | Special electricity saving device for injection molding oil pump motor |
| CN101807799A (en) * | 2010-04-27 | 2010-08-18 | 天津大学 | Super capacitor energy storage type power quality compensator |
| CN204517409U (en) * | 2015-02-04 | 2015-07-29 | 江苏嘉宇电气科技有限公司 | Electrodeless variable displacement type Intelligent capacitor |
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Application publication date: 20151007 |
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