CN205051355U - Can realize continuous reactive compensation's electric capacitance - Google Patents
Can realize continuous reactive compensation's electric capacitance Download PDFInfo
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- CN205051355U CN205051355U CN201520762408.2U CN201520762408U CN205051355U CN 205051355 U CN205051355 U CN 205051355U CN 201520762408 U CN201520762408 U CN 201520762408U CN 205051355 U CN205051355 U CN 205051355U
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- electric capacitor
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- electric
- electric capacitance
- controlled switch
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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 provides a pair of can realize continuous reactive compensation's electric capacitance has realized continuous reactive compensation when reactive compensation uses for power consumption power factor infinitely approaches ten -percent and is possible. Including cuk chopper circuit and being controlled electric capacitance C, electric capacitance C parallel connection is at cuk chopper circuit's output, cuk chopper circuit includes power supply E, controllable switch V, reactor L1 and L2, electric capacitance C1 and electric power diode VD, controllable switch V's positive pole is through connect E's positive pole of reactor L1, connect E's negative pole of controllable switch V's negative pole, controllable switch V's gate pole is used for connection director, the duty cycle that switches on through controller control controllable switch V, terminal voltage UO's size with control electric capacitance C, thereby control electric capacitance's reactive power is variable in succession.
Description
Technical field
The utility model relates to electric capacitor technical field, particularly relates to a kind of electric capacitor that can realize Continuous Var Compensation.
Background technology
Electric capacitor, refers to the capacitor for electric power system and electrical equipment.Any two pieces of metallic conductors, centre dielectric separates, and namely forms a capacitor.The size of condenser capacitance, is decided by the characteristic of dielectric between its physical dimension and two-plate.In modern electric electric power system, electric capacitor is usually used in reactive power compensation, to improve the power factor of electrical network.Therefore, when capacitor uses under alternating voltage, Chang Yiqi reactive power represents the capacity of capacitor, unit be weary or kilovar.The electric capacitor that mostly current electric capacitor is withstand voltage and amount of capacity is inconsistent, when being used as reactive power compensation, all that dependence increases and reduce the quantity of electric capacitor to reach required reactive compensation requirements, but the best standard of reactive power compensation is-make electric power factor infinite approach 1, so require that needing to control electric capacitor when reactive power compensation wants continuously adjustabe to save, the certain electric capacity of alone capacity goes to compensate and can not realize completely.
Utility model content
The weak point that the utility model exists for prior art, provides a kind of electric capacitor that can realize Continuous Var Compensation, achieves continuous print reactive power compensation when reactive power compensation is applied, and making electric power factor be infinitely close to 1 becomes possibility.
The technical solution of the utility model is:
Can realize an electric capacitor for Continuous Var Compensation, it is characterized in that, comprise Cuk chopper circuit and controlled electric capacitor C, described electric capacitor C is connected in the output of Cuk chopper circuit in parallel, described Cuk chopper circuit comprises power supply E, gate-controlled switch V, reactor L1 and L2 and electric capacitor C1 and Power Diode Pumped VD, the anode of described gate-controlled switch V connects the positive pole of power supply E by reactor L1, the negative electrode of gate-controlled switch V connects the negative pole of power supply E, the anode of gate-controlled switch V also connects one end of electric capacitor C1, the other end of electric capacitor C1 connects the positive pole of Power Diode Pumped VD and one end of reactor L2, the negative pole of Power Diode Pumped VD and the other end of reactor L2 are connected to the two ends of controlled electric capacitor C, the negative pole of Power Diode Pumped VD also connects the negative pole of power supply E, the gate pole of described gate-controlled switch V is used for connection control device, is controlled the duty ratio of gate-controlled switch V, to control the terminal voltage U of electric capacitor C by controller
osize, thus control the reactive power continuous variable of electric capacitor.
Described gate-controlled switch V is IGBT.
Technique effect of the present utility model:
The utility model provide a kind of can the electric capacitor of Continuous Var Compensation, the continuously adjustabe of electric capacitor port voltage can be realized by Cuk chopper circuit, and electric capacitor Q=CU (wherein Q is electricity, C is capacitance, U be capacitance voltage), and C is definite value, so just achieve the continuously adjustabe of electric capacitor electricity, achieve the Continuous Compensation of reactive power.Therefore can realize idle Continuous Compensation when reactive power compensation is applied, making electric power factor be infinitely close to 1 becomes possibility; Its control technology is simple, ripe, is applicable to very much intermediate and low electric network reactive power compensation and uses.And adopt Cuk chopper circuit to have an obvious advantage, namely its input power electric current and load current are all continuous print, and pulsation is very little, is conducive to input and output and carries out filtering.
Accompanying drawing explanation
Fig. 1 is embodiment circuit diagram of the present utility model.
Fig. 2 is the equivalent circuit diagram of Cuk chopper circuit.
Embodiment
A kind ofly can the embodiment of electric capacitor of Continuous Var Compensation to be described further of the present utility model below in conjunction with accompanying drawing.
As shown in Figure 1, embodiment circuit diagram of the present utility model.Can realize an electric capacitor for Continuous Var Compensation, comprise Cuk chopper circuit and controlled electric capacitor C, described electric capacitor C is connected in the output of Cuk chopper circuit in parallel, described Cuk chopper circuit comprises power supply E, gate-controlled switch V, reactor L1 and L2 and electric capacitor C1 and Power Diode Pumped VD, the anode of described gate-controlled switch V connects the positive pole of power supply E by reactor L1, the negative electrode of gate-controlled switch V connects the negative pole of power supply E, the anode of gate-controlled switch V also connects one end of electric capacitor C1, the other end of electric capacitor C1 connects the positive pole of Power Diode Pumped VD and one end of reactor L2, the negative pole of Power Diode Pumped VD and the other end of reactor L2 are connected to the two ends of controlled electric capacitor C, the negative pole of Power Diode Pumped VD also connects the negative pole of power supply E, the gate pole of described gate-controlled switch V is used for connection control device, is controlled the conducting duty ratio of gate-controlled switch V, to control the terminal voltage U of electric capacitor C by controller
osize, thus control the reactive power continuous variable of electric capacitor.Wherein, gate-controlled switch V adopts IGBT.
As shown in Figure 2, be the equivalent circuit diagram of Cuk chopper circuit.
In Fig. 1, when V is in conducting, E-L1-V loop and R-L2-C1-V loop respectively flow through electric current.When V is in off-state, E-L1-C1-VD loop and R-L2-VD loop respectively flow through electric current.The polarity of output voltage is contrary with the polarity of power supply.In the equivalent circuit diagram of cuk converter in fig. 2, be equivalent to S and alternately switch between A, B 2.During stable state, the mean value of the electric current of electric capacity C1 within a cycle is zero, and namely it is zero to the integration of time.
Namely
In CUK equivalent circuit diagram, it is t that switch S closes the time being in on-state to the time V of B point
on,then the integration of electric capacity C1 electric current and time is I
2t
on; When S close to the A point time be the time t that V is in off-state
off, then the product of electric capacity C1 electric current and time is I
1t
off; Can obtain thus
I
2t
on＝I
1t
off
Thus
I
2/I
1＝t
off/t
on＝(T-t
on)/t
on＝(1-α)/α
When electric capacity C1 very ambassador's capacitance voltage is pulsed enough hour, output voltage U
ocan try to achieve with following methods with the relation of input voltage E:
When S is incorporated into B point, B point voltage u
b=0, A point voltage u
a=-u
c1; On the contrary, when S is incorporated into A point, u
b=u
c1, u
a=0.Therefore the voltage U of B point
b=(t
off/ T) U
c1, (U
c1for the u of capacitance voltage
c1mean value), again because inductive drop L1 mean value is zero, so E=U
b=(t
off/ T) U
c1. on the other hand, the average voltage u of A point
a=-(t
on/ T) U
c1, and the average voltage level of L2 is zero, and according to the equivalent circuit diagram of CUK, output voltage u
opolarity, have U
o=(t
on/ T) U
c1.so can voltage U be drawn
owith the pass of power supply E be
U
O＝(t
on/t
off)E＝(t
on/T-t
on)E＝(α/1-α)E
Wherein U
ofor output voltage effective value, α is duty ratio.(ratio of the time that duty cycle alpha and V open and whole cycle time, whole cycle time be exactly service time with once closes the section time with)
Being step-down as 0< α <1/2, is boosting as 1/2< α <1
Namely the duty ratio of control IGBT just can continuous control output voltage U
o, thus control the continuous variable of electric capacitor, realize power factor and be infinitely close to 1.
In above embodiment, be only one citing of the present utility model, for the personnel of correlative technology field, still can create the utility model in specific embodiments and applications and modify or equivalent replacement; In sum, this description should not be construed as restriction of the present utility model, and all do not depart from technical scheme and the improvement thereof of spirit and scope of the present utility model, and it is all encompassed in the middle of the protection range of the utility model patent.
Claims (2)
1. can realize an electric capacitor for Continuous Var Compensation, it is characterized in that, comprise Cuk chopper circuit and controlled electric capacitor C, described electric capacitor C is connected in the output of Cuk chopper circuit in parallel, described Cuk chopper circuit comprises power supply E, gate-controlled switch V, reactor L1 and L2 and electric capacitor C1 and Power Diode Pumped VD, the anode of described gate-controlled switch V connects the positive pole of power supply E by reactor L1, the negative electrode of gate-controlled switch V connects the negative pole of power supply E, the anode of gate-controlled switch V also connects one end of electric capacitor C1, the other end of electric capacitor C1 connects the positive pole of Power Diode Pumped VD and one end of reactor L2, the negative pole of Power Diode Pumped VD and the other end of reactor L2 are connected to the two ends of controlled electric capacitor C, the negative pole of Power Diode Pumped VD also connects the negative pole of power supply E, the gate pole of described gate-controlled switch V is used for connection control device, is controlled the conducting duty ratio of gate-controlled switch V, to control the terminal voltage U of electric capacitor C by controller
osize, thus control the reactive power continuous variable of electric capacitor.
2. the electric capacitor that can realize Continuous Var Compensation according to claim 1, is characterized in that, described gate-controlled switch V is IGBT.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520762408.2U CN205051355U (en) | 2015-09-29 | 2015-09-29 | Can realize continuous reactive compensation's electric capacitance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520762408.2U CN205051355U (en) | 2015-09-29 | 2015-09-29 | Can realize continuous reactive compensation's electric capacitance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205051355U true CN205051355U (en) | 2016-02-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520762408.2U Active CN205051355U (en) | 2015-09-29 | 2015-09-29 | Can realize continuous reactive compensation's electric capacitance |
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| Country | Link |
|---|---|
| CN (1) | CN205051355U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106130064A (en) * | 2016-06-30 | 2016-11-16 | 全球能源互联网研究院 | A kind of photovoltaic miniature inverter |
-
2015
- 2015-09-29 CN CN201520762408.2U patent/CN205051355U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106130064A (en) * | 2016-06-30 | 2016-11-16 | 全球能源互联网研究院 | A kind of photovoltaic miniature inverter |
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| GR01 | Patent grant |