CN207625439U - A kind of control system of three-phase tri-level VIENNA rectifier - Google Patents
A kind of control system of three-phase tri-level VIENNA rectifier Download PDFInfo
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- CN207625439U CN207625439U CN201721362496.2U CN201721362496U CN207625439U CN 207625439 U CN207625439 U CN 207625439U CN 201721362496 U CN201721362496 U CN 201721362496U CN 207625439 U CN207625439 U CN 207625439U
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The utility model belongs to power electronics field, and in particular to a kind of control system of three-phase tri-level VIENNA rectifier.The described system includes three-phase tri-level VIENNA rectifier, current sampling circuit, rectification circuit, carrier generation circuit, voltage regulator and voltage sampling circuit, the system decays to 2 order harmonic components contained in voltage regulator output signal, and the signal of other frequency ranges is unaffected.The utility model effectively inhibits the three phase harmonic component of higher magnitude in three-phase input current, improves rectifier input current waveform quality.
Description
Technical field
The utility model belongs to power electronics field, and in particular to a kind of control of three-phase tri-level VIENNA rectifier
System processed.
Background technology
With the continuous development of power semiconductor and control technology, the application of power electronic equipment is more and more extensive,
Due to unintentional nonlinearity feature existing for power electronic devices, most of rectifier equipment can lead to larger electricity in net side
Harmonic wave and lower power factor are flowed, in order to solve this problem, circuit of power factor correction is more and more widely used.Three
Three level VIENNA rectifier of phase is as three level Boost type neutral point clamps (neutral point clamped, NPC) structure
One kind of converter, with circuit structure is simple, switching voltage stress is small, Harmonics of Input content is low, it is single that input can be achieved
The advantages that position PFC.
One-cycle control (OCC) is to be carried by the Keyue M Smedley of California, USA university early 1990s
A kind of novel control without multiplier gone out.This method is by controlling duty cycle of switching, forced commutation device two
The average value that pole pipe exports pulse is equal or proportional in each switch periods and control reference quantity.One circle control passes through
It resets integrator, comparator, controller and achievees the purpose that trace command signal, there is the double action of control and modulation, be one
The typical nonlinear control techniques of kind, one-cycle control need not carry out error synthesis in the loop, therefore in a week
Transient state and steady-state error can be automatically eliminated in phase, have that switching frequency is constant, circuit control is simply easily realized, response speed
Soon, the features such as strong robustness.
The three-phase tri-level VIENNA rectifier of one circle control is with dynamic response is fast, switching frequency is stable, input is electric
Stream aberration rate is low, the advantages that being easily achieved.However in actual application, since input power is usual and nonideal symmetrical electricity
Potential source, in the case, the Three-phase PFC input current under traditional one circle control control theory will will produce larger
Third-harmonic component, to influence input current THD (total harmonic distortion total harmonic distortions).
Invention content
According to the above-mentioned deficiencies of the prior art, technical problem to be solved in the utility model is to propose a kind of three electricity of three-phase
The control system of flat VIENNA rectifier, by declining to 2 order harmonic components contained in voltage regulator output signal
Subtract, the signal of other frequency ranges is unaffected, solves the Three-phase PFC input electricity under traditional one circle control control theory
The problem of stream is by will produce larger third-harmonic component has the effect of improving rectifier input current waveform quality.
In order to solve the above-mentioned technical problem, the technical solution adopted in the utility model is：
A kind of control system of three-phase tri-level VIENNA rectifier, to 2 contained in voltage regulator output signal
Order harmonic components decay, and the signal of other frequency ranges is unaffected.
Preferably, the described system includes three-phase tri-level VIENNA rectifier, current sampling circuit, rectification circuit, load
Wave generative circuit, voltage regulator and voltage sampling circuit, current sampling circuit are defeated with three-phase tri-level VIENNA rectifier
Enter end connection, the input current signal of acquisition sends rectification circuit, voltage sampling circuit and three-phase tri-level VIENNA rectifications to
The output end of device connects, and sends the output voltage signal of acquisition to carrier generation circuit through voltage regulator, carrier wave generates electricity
Road and rectification circuit generate control signal jointly again, control three-phase tri-level VIENNA rectifier, the described system is also
Including resonant controller, voltage regulator is connect by resonant controller with carrier generation circuit.
Preferably, the three-phase tri-level VIENNA rectifier includes two capacitances, and two capacitances are connected in parallel on the rectifier
Outlet side, the described system further includes pressing adjuster, press adjuster one end respectively with the three-phase tri-level VIENNA
The capacitance of rectifier output end is connected, and the other end is connected with the rectification circuit.
Preferably, the described system further includes current foldback circuit, and current foldback circuit is connected to the three-phase tri-level
The input terminal of VIENNA rectifier.
Preferably, the current foldback circuit includes two comparators and two phase inverters, a wherein phase for three phase mains
Input is connect with the input terminal of two comparators respectively, and the other two-phase input of three phase mains connects with the output end of two comparators respectively
It connects, two inverter series, the input terminal after series connection is connected with the output end of two comparators.
The utility model advantageous effect is:
The three phase harmonic component for effectively inhibiting higher magnitude in three-phase input current, improves rectifier input current waveform matter
Amount.
Description of the drawings
The content expressed by this specification attached drawing and the label in figure are briefly described below：
Fig. 1 is the VIENNA rectifier main circuit topology figure of specific implementation mode.
Fig. 2 is traditional one circle control schematic diagram of specific implementation mode.
Fig. 3 is the control system general frame figure of specific implementation mode.
Fig. 4 is the control system architecture figure of specific implementation mode.
Fig. 5 is the circuit diagram of the simulation resonant controller of specific implementation mode.
Fig. 6 is the current foldback circuit figure of specific implementation mode.
Specific implementation mode
Below by the description to embodiment, the shape of for example involved each component of specific embodiment of the present utility model
The effect and operation principle of mutual alignment and connection relation, each section between shape, construction, each section, manufacturing process and operation
Application method etc., is described in further detail, to help those skilled in the art to conceive the utility model of the utility model,
Technical solution has more complete, accurate and deep understanding.
Such as the main circuit topology figure that Fig. 1 is three-phase tri-level VIENNA rectifier, wherein Ua、Ub、UcFor the three-phase of rectifier
Input power, Lsa、Lsb、LscFor Inductor, ia、ib、icFor exchange side input current, S1、S2、S3For switching tube, RLIt is defeated
Go out load resistance, UdcFor DC side output voltage, c1, c2 are respectively DC support capacitance, Uc1、Uc2It is then two end of capacitance respectively
Voltage.When input power is ideal symmetrical balance voltage source
In above formula, ReFor the equivalent resistance after system unit power factor compensation.
When the nonideal equilibrium state of input power
Wherein SA、SB、SCFor corresponding switch function, while by rectifier input AC side and the output instantaneous work(of DC side
Rate conservation can obtain
Uaia+Ubib+Ucic=Udcidc (3)
It can be obtained by (2), (3)
SAia+SBib+SCic=2idc (4)
Three-phase input current fundamental wave is
In above formula, Ia、Ib、IcFor the peak value of input current fundamental wave, θa、θb、θcFor the initial phase of input current fundamental wave, ω
To input the angular frequency of fundamental wave.
The Fourier expansion formula of switch function is
In above formula, SnFor switch function each harmonic component.Convolution (4), (5), (6) can obtain
There is above formula to can be seen that when input is nonideal equilibrium state, is exchanged by VIENNA rectifier input side
The fundametal compoment of electric current and switch function dependent interaction will lead to times subharmonic point for exporting DC side generation input fundamental frequency
Amount, and harmonic amplitude is related with the non-equilibrium state of input.
Fig. 2 is traditional one circle control schematic diagram, and the core equations of control are
Wherein Um=UdcRs/2Re, and RsFor the sampling resistor of input current.
As shown in Fig. 2, acquisition input current passes through the output voltage of rectification circuit and acquisition through voltage regulator and load
Wave generator generates control signal switch tube and is controlled jointly, when the nonideal equilibrium state of input power, to ensure
The stable state accuracy and dynamic response performance of rectifier, the low-frequency gain of voltage regulator is generally larger, can be obtained 2 times by (7) formula
Harmonic component is
In control loop, 2 order harmonic components in output DC voltage sampling are amplified through voltage regulator, to
So that regulator output signal contains corresponding 2 subharmonic.The harmonic component interacts to obtain with switch function fundametal compoment
Three-phase input current be
From the above equation, we can see that when the nonideal equilibrium state of three-phase input, rectifier three-phase input current will be caused to generate 3
Order harmonic components influence the waveform quality of input current to increase the distortion degree of input current.
Such as Fig. 3 and Fig. 4, a kind of control system of three-phase tri-level VIENNA rectifier, including three-phase tri-level VIENNA
Rectifier, current sampling circuit, rectification circuit, carrier generation circuit, voltage regulator and voltage sampling circuit, current sample electricity
Road and voltage sampling circuit are connect with the input terminal of three-phase tri-level VIENNA rectifier and output end respectively, and by the defeated of acquisition
Enter current signal and send rectification circuit to, sends the output voltage signal of acquisition to carrier generation circuit through voltage regulator,
Carrier generation circuit and rectification circuit generate control signal jointly again, control three-phase tri-level VIENNA rectifier, should
System further includes resonant controller, and voltage regulator is connect by resonant controller with carrier generation circuit.Wherein resonance controls
Device is the utility model to inhibit when input power imbalance, 3 order harmonic components that rectifier three-phase input current generates
And introduce.Its main function is only to decay to 2 order harmonic components contained in voltage regulator output signal, other
The signal of frequency range is unaffected, so that corresponding 2 flutter components contained in carrier amplitude are inhibited, it is final big
Big 3 order harmonic components reduced in input current.The addition of pressure adjuster is to ensure the output of rectifier DC side two
Filter capacitor divides equally output voltage.
Fig. 5 is simulation resonant controller internal structure chart, and the transmission function of resonant controller is
Wherein
From above formula, it is known that when Q takes different value, resonant controller is to the required assigned frequency filtered out
Component effect it is also different, meanwhile, resonant controller only to the signal at assigned frequency have high inhibition effect, to other frequency ranges
Interior signal does not influence.
Fig. 6 is the current foldback circuit of sample circuit, the PI links mainly formed by peak holding circuit and by amplifier
An error signal is obtained, the i in three-phase sample circuit is only indicated in figurea, ib、icCurrent foldback circuit and iaOvercurrent protect
The circuit diagram of protection circuit is the same.Its main function is when the electric current of output is more than limit value, and the error signal is just
The duty ratio that PWM chip can be controlled, to make output current be maintained at limit value, the output current of three-phase current sampling can all collect
In be output to O points, the circuit that subsequent conditioning circuit is made of two phase inverters, its main function is, when output current is less than limit
Flow valuve is, to make circuit not work the control of duty ratio, and output current be higher than limit value when, then can work.
The workflow of the three-phase tri-level VIENNA rectifier is as follows：
Step 1：Acquire the three-phase input current i of three-phase tri-level VIENNA rectifiera、ib、ic, outlet side DC voltage
Udc, output capacitance voltage UC1And Uc2, output voltage reference value Udcref；
Step 2：By output voltage reference value UdcrefWith outlet side DC voltage UdcIt is sent into voltage regulator and generates Um, Um
The output valve of voltage regulator when the stable state that works for circuit；
Step 3：By UmU is generated by resonant controller and carrier generation circuitm1, Um1For the output valve of voltage regulator
The value exported after harmonic controller decays to 2 order harmonic components contained by it；
Step 4：By UC1And Uc2By pressing adjuster to generate Uf, UfFor the output filtering obtained by pressure adjuster
The equal score value of capacitance；
Step 5：By UfWith the three-phase input current i of acquisitiona、ib、icGenerated by rectification circuit | Uf+RSix|, wherein ix
Indicate ia、ib、ic；
Step 6：Carrier generation circuit exports Um1Exported with rectification circuit | Uf+Rsix| S is generated jointly1、S2、S3Duty
Compare da、db、dc。
The utility model is exemplarily described above, it is clear that the utility model implements not by aforesaid way
Limitation, as long as not using the methodology of the utility model and the improvement of various unsubstantialities that technical solution carries out, or not
It is improved that the design of the utility model and technical solution are directly applied into other occasions, in the protection model of the utility model
Within enclosing.The scope of protection of the utility model should be determined by the scope of protection defined in the claims.
Claims (4)
1. a kind of control system of three-phase tri-level VIENNA rectifier is it is characterized in that, the described system includes three-phase tri-level
VIENNA rectifier, current sampling circuit, rectification circuit, carrier generation circuit, voltage regulator and voltage sampling circuit, electric current
Sample circuit is connect with the input terminal of three-phase tri-level VIENNA rectifier, and the input current signal of acquisition sends rectified current to
Road, voltage sampling circuit are connect with the output end of three-phase tri-level VIENNA rectifier, by the output voltage signal of acquisition through electricity
Pressure adjuster sends carrier generation circuit to, and carrier generation circuit and rectification circuit generate control signal jointly again, to three-phase three
Level VIENNA rectifier is controlled, and the described system further includes resonant controller, and voltage regulator passes through resonant controller
It is connect with carrier generation circuit.
2. the control system of three-phase tri-level VIENNA rectifier according to claim 1, which is characterized in that the three-phase
Three level VIENNA rectifiers include two capacitances, and two capacitances are connected in parallel on the outlet side of the rectifier, and the described system is also wrapped
It includes and presses adjuster, adjuster one end is pressed to be connected respectively with the capacitance of the three-phase tri-level VIENNA rectifier output end,
The other end is connected with the rectification circuit.
3. the control system of three-phase tri-level VIENNA rectifier according to claim 1, which is characterized in that described this be
System further includes current foldback circuit, and current foldback circuit is connected to the input terminal of the three-phase tri-level VIENNA rectifier.
4. the control system of three-phase tri-level VIENNA rectifier according to claim 3, which is characterized in that the overcurrent
It includes two comparators and two phase inverters to protect circuit, and a wherein phase for three phase mains inputs the input with two comparators respectively
The other two-phase input of end connection, three phase mains is connect with the output end of two comparators respectively, two inverter series, after series connection
Input terminal be connected with the output end of two comparators.
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| CN201721362496.2U CN207625439U (en) | 2017-10-20 | 2017-10-20 | A kind of control system of three-phase tri-level VIENNA rectifier |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112165264A (en) * | 2020-09-21 | 2021-01-01 | 哈尔滨工程大学 | Method for inhibiting current waveform distortion of three-phase VIENNA rectifier |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112165264A (en) * | 2020-09-21 | 2021-01-01 | 哈尔滨工程大学 | Method for inhibiting current waveform distortion of three-phase VIENNA rectifier |
| CN112165264B (en) * | 2020-09-21 | 2022-04-12 | 哈尔滨工程大学 | Method for inhibiting current waveform distortion of three-phase VIENNA rectifier |
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| GR01 | Patent grant | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180717 Termination date: 20191020 |