CN206226022U - A kind of realtime power factor correcting circuit of use fractional order electric capacity - Google Patents
A kind of realtime power factor correcting circuit of use fractional order electric capacity Download PDFInfo
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- CN206226022U CN206226022U CN201621211989.1U CN201621211989U CN206226022U CN 206226022 U CN206226022 U CN 206226022U CN 201621211989 U CN201621211989 U CN 201621211989U CN 206226022 U CN206226022 U CN 206226022U
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- electric capacity
- fractional order
- order electric
- power factor
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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 kind of realtime power factor correcting circuit of use fractional order electric capacity, including input ac power, exponent number and the controllable fractional order electric capacity of capacitance, load, voltage sample device, current sampler and controller.Voltage sample device sampled input voltage, current sampler sampling load current, the voltage and current signal that controller is collected according to voltage sample device and current sampler, the signal of output control fractional order electric capacity exponent number and capacitance, so as to adjust the exponent number and capacitance size of fractional order electric capacity so that the power factor of input power side reaches 1.The real time correction of unity power factor can effectively be realized.The utility model adjusts the capacitance and exponent number of fractional order electric capacity by real-time detection input voltage and load current, realizes unity power factor real time correction, and only with an element realizes power factor emendation function, simple structure.
Description
Technical field
The utility model is related to the technical field of PFC, refers in particular to a kind of the real-time of use fractional order electric capacity
Circuit of power factor correction.
Background technology
Because most of electrical equipments are to hinder inductive load, it is necessary to from power system absorbing reactive power, power factor is not
Height, causing the capacity of power supply unit can not be fully used, while causing power system electric energy loss increase and power supply quality
Reduce.In order to improve the power factor of whole system, circuit of power factor correction is generally added in systems.Typical power because
Number bearing calibration includes PPFC and APFC, and PPFC is according to inductance capacitance
The complementary characteristic of reactive power, the power factor of circuit, structure letter are improved by the method in inductive load end shunt capacitance
It is single.But because capacitor's capacity is fixed numbers, it is impossible to consecutive variations, therefore when load changes, it is impossible to realize unit power
Factor correcting.Although APFC device can accomplish that realtime power factor is corrected, the structure of these devices is answered
It is miscellaneous and relatively costly.
In recent years, this new device of fractional order electric capacity is successfully produced.The utility model utilizes fractional order electric capacity rank
Number and the adjustable characteristic of capacitance, propose using the realtime power factor correcting circuit of fractional order electric capacity.With existing power factor
Correcting circuit is compared, and the utility model can not only realize the real time correction of power factor, and has only used one controllable point
Number rank capacity cell, simple structure, control is flexible, with fabulous application prospect.
The content of the invention
The purpose of this utility model be overcome the shortcoming of prior art with it is not enough, there is provided it is a kind of it is simple and reasonable for structure, can
The realtime power factor correcting circuit of the use fractional order electric capacity for leaning on, can effectively realize the real time correction of unity power factor.
To achieve the above object, technical scheme provided by the utility model is：A kind of use fractional order electric capacity it is real-time
Circuit of power factor correction, the realtime power factor correcting circuit includes AC power, exponent number and the controllable fractional order of capacitance
Electric capacity, load, voltage sample device, current sampler and controller；The A ends of the AC power and one end phase of fractional order electric capacity
Even, the B ends of the AC power are connected with the other end of fractional order electric capacity, and one end of the load is connected with the A ends of AC power,
The other end of the load is connected with one end of current sampler, and the other end of the current sampler is connected with the B ends of AC power,
One end of the voltage sample device is connected with the A ends of AC power, the other end of the voltage sample device and the B ends phase of AC power
Even, the output of the voltage sample device and the output of current sampler is connected with controller respectively, the output of the controller with divide
Number rank electric capacity is connected.
The admittance of the realtime power factor correcting circuit is as follows：
In formula, RLIt is the resistance of resistance, L is the inductance value of inductance, and ω is the angular frequency of circuit work, CαIt is fractional order electric capacity
Capacitance, α for fractional order electric capacity exponent number；Load is by inductance L and resistance RLConstitute；
In circuit with the ratio cos φ of active-power P and apparent energy S come the power-factor angle of indication circuit, φ is
The impedance angle of system or admittance angle, the power factor of the circuit is obtained by (1) formula：
Knowable to (2) formula, unity power factor λ=1 is realized, the B in equivalent admittance need to be madeeq=0, then have：
Known load impedance is：
The phase difference of note load voltage and electric current is θ, then have：
ω L=| Z | sin θs (5)
(4) formula and (5) formula are brought into (3) formula, the capacitance for further obtaining fractional order electric capacity is：
Zu Kang ∣ Z ∣ are carried by the phase difference θ and Fu of real-time detection load voltage (i.e. input voltage) and electric current, it becomes possible to
The capacitance size of a certain exponent number fractional order electric capacity of correspondence to required for realizing unity power factor correction；
When the exponent number of fractional order electric capacity is more than 1, the voltage vector of fractional order electric capacity and the angle of current vector are π α/2,
More than 90 degree, now fractional order electric capacity can not only provide reactive power to load, and be also provided with work(power.
The exponent number adjustable range of the fractional order electric capacity is 0~2.
The capacitance of the fractional order electric capacity can be continuously adjusted.
The utility model compared with prior art, has the following advantages that and beneficial effect：
1st, by real-time detection input voltage and load current, the capacitance and exponent number of fractional order electric capacity are adjusted, realizes unit
Power factor real time correction.
2nd, the exponent number of fractional order electric capacity and capacitance continuously adjustabe.
3rd, when the exponent number of fractional order electric capacity is more than 1, fractional order electric capacity with compensating power, but also can not only be provided
Active power.
4th, power factor emendation function, simple structure only are realized with an element.
Brief description of the drawings
Fig. 1 is realtime power factor correcting circuit figure of the present utility model.
Fig. 2 a are the input AC side voltage of realtime power factor correcting circuit of the present utility model, input AC side electricity
One of stream, fractional order capacitance current, load current vectogram.
Fig. 2 b are the input AC side voltage of realtime power factor correcting circuit of the present utility model, input AC side electricity
Stream, fractional order capacitance current, the two of load current vectogram.
Fig. 3 is realtime power factor correcting circuit analogous diagram of the present utility model.
Fig. 4 is realtime power factor correcting circuit input voltage, defeated of the utility model using the fractional order electric capacity of 1.3 ranks
Enter electric current and fractional order capacitance current analogous diagram.
Fig. 5 is realtime power factor correcting circuit input voltage, defeated of the utility model using the fractional order electric capacity of 1.5 ranks
Enter electric current and fractional order capacitance current analogous diagram.
Specific embodiment
With reference to specific embodiment, the utility model is described in further detail.
As shown in figure 1, the realtime power factor correcting circuit of the use fractional order electric capacity described in the present embodiment, including exchange
Power supply 1, exponent number and the controllable fractional order electric capacity 2 of capacitance, load 3, voltage sample device 4, current sampler 5 and controller 6.Exchange
The A ends of power supply 1 are connected with one end of fractional order electric capacity 2, and the B ends of AC power 1 are connected with the other end of fractional order electric capacity 2, bear
The one end for carrying 3 is connected with the A ends of AC power 1, and the other end of load 3 is connected with one end of current sampler 5, current sampler
5 other end is connected with the B ends of AC power 1, and one end of voltage sample device 4 is connected with the A ends of AC power 1, voltage sample
The other end of device is connected with the B ends of AC power 1, the output of voltage sample device 4 and the output of current sampler 5 respectively with control
Device 6 is connected, and the output of controller 6 is connected with fractional order electric capacity 2.
The control method of the above-mentioned realtime power factor correcting circuit of the present embodiment is：First, controller 6 is by voltage sample device
4 and the input voltage that samples of current sampler 5 and load current be transformed into the square-wave signal of same frequency same-phase, obtain corresponding
Input voltage and load current phase difference, while according to input voltage and the size of load current, being loaded accordingly
Impedance；The size of the exponent number of required fractional order electric capacity 2, capacitance is obtained then according to phase difference and load impedance；Work as supply voltage
Or load is when changing, controller 6 is according to the voltage and current signal for sampling, the size of regulation fractional order electric capacity 2 so that defeated
The power factor for entering mains side reaches 1, so as to realize the real time correction of unity power factor.
Resistance inductive load in Fig. 1 circuits is by inductance L and resistance RLConstitute, CαIt is fractional order electric capacity in parallel.Now circuit
Admittance：
In formula, RLIt is the resistance of resistance, L is the inductance value of inductance, and ω is the angular frequency of circuit work, CαIt is fractional order electric capacity
Capacitance, α for fractional order electric capacity exponent number.
In circuit generally with the ratio cos φ of active-power P and apparent energy S come the power-factor angle of indication circuit,
φ can be impedance angle or the admittance angle of system, by the power factor of (1) Shi Ke get circuits：
Knowable to (2) formula, unity power factor λ=1 is realized, the B in equivalent admittance need to be madeeq=0, then have：
Known load impedance is：
The phase difference of note load voltage and electric current is θ, then have：
ω L=| Z | sin θs (5)
(4) formula and (5) formula are brought into (3) formula, the capacitance for further obtaining fractional order electric capacity is：
Zu Kang ∣ Z ∣ are carried by the phase difference θ and Fu of real-time detection load voltage (i.e. input voltage) and electric current, it is possible to
The capacitance size of a certain exponent number fractional order electric capacity of correspondence to required for realizing unity power factor correction.The rank of fractional order electric capacity
Number adjustable range is 0~2, and capacitance can be continuously adjusted.
Before correction, the input voltage V of fractional order Capacitance Power factor correcting circuits, input current Is, fractional order electric capacity electricity
Stream IcWith load current ILAs shown in Figure 2 a, it is clear that circuit power factor is not up to 1.If the exponent number of fractional order electric capacity is constant, increase
The capacitance of fractional order electric capacity, so as to increase the electric current of fractional order electric capacity.Now fractional order Capacitance Power factor correcting circuit is defeated
Enter voltage Vs, input current Is, fractional order capacitance current IcWith load current ILAs shown in Figure 2 b, it is seen that the power factor of circuit
Reach 1.When the exponent number of fractional order electric capacity is more than 1, the voltage vector of fractional order electric capacity and the angle of current vector are π α/2, greatly
In 90 degree, now fractional order electric capacity not only can provide reactive power to load, but also there is provided active power.
Fig. 3 is the PSIM analogue system figures of the above-mentioned realtime power factor correcting circuit of the present embodiment.Wherein load switches mould
Block is used to embody the power factor real time correction effect of utility model circuit；Voltage, current signal modular converter are by voltage signal
Square-wave signal is converted to current signal, is easy to phase-detection；Impedance detection module is used to calculate the size of Zu Kang ∣ Z ∣；Fraction
Rank electric capacity realizes that output current meets with a controlled current source：Wherein CαIt is the capacitance of fractional order electric capacity,
α is the exponent number of fractional order electric capacity, α ∈ (0,2) and α ≠ 1.
According to simulation system parameters, (6) formula is changed into：
K in formulasIt is voltage sample coefficient, KiIt is current sample coefficient.K1、K2And K4It is proportional control factor, for the ease of
Measurement Zu Kang ∣ Z ∣, make KsK1=1, KiK2=1.K4=1/ (sin (0.5 π α) ωα)。
Choose vinThe circuit, corresponding voltage sample COEFFICIENT K are verified for the AC-input voltage source of 100V/50Hzs=
0.01, then K1=100；Current sample COEFFICIENT Ki=0.1, then K2=10；R before load switchingL=30 Ω, L=14mH, load is cut
Change rear RL=25 Ω, L=14mH；Exponent number α=1.3 are taken, then K4=6.37 × 10-4, the input voltage v that emulation is obtainedinAnd input
Electric current iinAnd fractional order capacitance current icαAs shown in figure 4, as seen from the figure when switching is loaded, fractional order capacitance current is obtained
To real-time regulation, input voltage and input current still keep same phase, and the power factor of circuit is still 1.If by exponent number be changed to α=
1.5, then K4=2.54 × 10-4, the input voltage v that emulation is obtainedinWith input current iinAnd fractional order capacitance current icαAs schemed
Shown in 5, as seen from the figure when switching is loaded, fractional order capacitance current obtains real-time regulation, and input voltage and input current
Same phase is still kept, the power factor of circuit is still 1.The simulation results show feasibility of the utility model circuit.
Embodiment described above is only the preferred embodiment of the utility model, not limits implementation of the present utility model with this
Scope, therefore the change that all shapes according to the utility model, principle are made, all should cover in protection domain of the present utility model.
Claims (2)
1. a kind of realtime power factor correcting circuit of use fractional order electric capacity, it is characterised in that：The realtime power factor school
Positive circuit includes AC power, exponent number and the controllable fractional order electric capacity of capacitance, load, voltage sample device, current sampler and control
Device processed；The A ends of the AC power are connected with one end of fractional order electric capacity, and the B ends of the AC power are another with fractional order electric capacity
One end is connected, and one end of the load is connected with the A ends of AC power, the other end of the load and one end phase of current sampler
Even, the other end of the current sampler is connected with the B ends of AC power, one end of the voltage sample device and the A of AC power
End is connected, and the other end of the voltage sample device is connected with the B ends of AC power, the output of the voltage sample device and current sample
The output of device is connected with controller respectively, and the output of the controller is connected with fractional order electric capacity.
2. the realtime power factor correcting circuit of a kind of use fractional order electric capacity according to claim 1, it is characterised in that：
The exponent number adjustable range of the fractional order electric capacity is 0~2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201621211989.1U CN206226022U (en) | 2016-11-10 | 2016-11-10 | A kind of realtime power factor correcting circuit of use fractional order electric capacity |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201621211989.1U CN206226022U (en) | 2016-11-10 | 2016-11-10 | A kind of realtime power factor correcting circuit of use fractional order electric capacity |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106410818A (en) * | 2016-11-10 | 2017-02-15 | 华南理工大学 | Real-time power factor correction circuit with fractional-order capacitor and control method thereof |
-
2016
- 2016-11-10 CN CN201621211989.1U patent/CN206226022U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106410818A (en) * | 2016-11-10 | 2017-02-15 | 华南理工大学 | Real-time power factor correction circuit with fractional-order capacitor and control method thereof |
| CN106410818B (en) * | 2016-11-10 | 2018-11-02 | 华南理工大学 | Using the realtime power factor correcting circuit and its control method of fractional order capacitance |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170606 Termination date: 20211110 |