CN111181420B - Single-phase Vienna rectifier and control method thereof - Google Patents
Single-phase Vienna rectifier and control method thereof Download PDFInfo
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- CN111181420B CN111181420B CN201911338784.8A CN201911338784A CN111181420B CN 111181420 B CN111181420 B CN 111181420B CN 201911338784 A CN201911338784 A CN 201911338784A CN 111181420 B CN111181420 B CN 111181420B
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
-
- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
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Abstract
The invention discloses a single-phase Vienna rectifier and a control method thereof, wherein the single-phase Vienna rectifier is connected to a single-phase power grid, and an input voltage V_ac outputs stable high-power direct-current output voltage vo_dc and stable current after passing through an energy storage inductor, a rectifier bridge, a MOSFET (metal oxide semiconductor field effect transistor), a fast recovery diode and a filter capacitor, so that the volumes of the filter capacitor and the energy storage inductor are reduced, and the material cost is reduced; the control method of the single-phase Vienna rectifier adopts a midpoint balance control scheme of a midpoint voltage equalizing ring, a power grid feedforward control method and a voltage outer ring and current inner ring closed-loop tracking power grid control method according to a calculation formula of the change of positive and negative half periods of the commercial power, so that the control effect of the midpoint voltage balance is good, the power grid adaptability is strong, the calculation is simple, and the control method has the performance of high power factors and low current total harmonics.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a single-phase Vienna rectifier and a control method thereof.
Background
With the rapid development of power electronics technology, a nonlinear switching power supply injects a large number of multiple harmonics into a power grid, and serious distortion of a power grid waveform may cause failure of electric equipment, so that power factor correction circuits and techniques are increasingly applied to power electronics equipment.
The single-phase Vienna rectifier is a power factor correction rectifier widely applied to industries such as communication, electric power, charging piles and the like at present, when the existing single-phase Vienna rectifier is connected to a single-phase power grid, the volumes of an energy storage inductor and a filter capacitor are slightly large, the material cost is slightly high, and the electric stress of a switching tube and a diode is large.
On the other hand, the conventional control method of the single-phase vienna converter comprises an SVPWM vector control method, a single-period control method and the like, but has the defects of complex SVPWM, large coordinate transformation calculation amount, poor power grid adaptability, poor neutral-point voltage balance control effect and the like.
The above disadvantages are to be improved.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a single-phase Vienna rectifier and a control method thereof.
The technical scheme of the invention is as follows:
a single-phase Vienna rectifier,
one end of the input voltage V_ac is connected with a first input end of the rectifier bridge through an inductor L1, the other end of the input voltage V_ac is connected with a second input end of the rectifier bridge,
the first output end of the rectifier bridge is respectively connected with the anode of the fifth diode D5 and one end of the current sampling element l_ac,
the cathode of the fifth diode D5 is connected to one end of the output voltage Vo dc,
the other end of the current sampling element l-ac is connected with one end of the switching tube Q1,
the second output end of the rectifier bridge is respectively connected with the other end of the switch tube Q1 and the cathode of the sixth diode D6,
the anode of the sixth diode D6 is connected to the other end of the output voltage vo_dc.
The single-phase Vienna rectifier comprises four diodes connected end to end.
Further, the rectifier bridge includes a first diode D1, a second diode D2, a third diode D3 and a fourth diode D4, a first input end of the rectifier bridge is disposed between the first diode D1 and the second diode D2, a second input end of the rectifier bridge is disposed between the third diode D3 and the fourth diode D4, a first output end of the rectifier bridge is disposed between the first diode D1 and the third diode D3, and a second output end of the rectifier bridge is disposed between the second diode D2 and the fourth diode D4.
In the single-phase Vienna rectifier, the cathode of the fifth diode D5 is further connected to one end of the first filter capacitor C1, the second input end of the rectifier bridge is further connected to the other end of the first filter capacitor C1 and one end of the second filter capacitor C2, and the other end of the second filter capacitor C2 is connected to the anode of the sixth diode D6 and the other end of the output voltage, respectively.
In the single-phase Vienna rectifier, load resistors Rload are arranged at two ends of the output voltage vo_dc.
The single-phase Vienna rectifier is externally connected with a single-phase power grid and outputs high-power high-voltage direct-current voltage.
In the single-phase Vienna rectifier, the inductor L1 is an energy storage inductor.
In the single-phase Vienna rectifier, the switching tube Q1 is a field effect tube, the other end of the current sampling element l_ac is connected to the drain electrode of the field effect tube, the source electrode of the field effect tube is respectively connected to the second output end of the rectifier bridge and the cathode of the sixth diode D6, and the gate electrode of the field effect tube is connected to the main controller to output the SPWM signal.
In the single-phase Vienna rectifier, the voltage at two ends of the first filter capacitor C1 is a positive voltage Vp, and the voltage at two ends of the second filter capacitor C2 is a negative voltage Vn.
A control method of a single-phase Vienna rectifier comprises the following steps:
s1: the input voltage V ac, input current I ac, positive voltage Vp and negative voltage Vn are collected,
s2: calculates the effective value V_acRMS and feedforward coefficient value K of the input voltage,
s3: the positive voltage Vp and the negative voltage Vn are controlled to obtain a midpoint voltage equalizing ring output value Vmidou _ pid,
s4: judging the positive and negative periods of the input voltage V_ac, calculating the voltage ring error value err0,
s5: the error value err0 of the voltage loop is controlled to obtain the output value Vout_pid of the voltage loop,
s6: determining a current loop reference value expression according to the positive and negative periods of the input voltage V_ac to obtain a current loop reference value,
s7: the current loop reference value and the input current I_ac are subjected to control operation to obtain a current loop output value Iout_pid,
s8: and SPWM modulation is carried out on the current loop output value Iout_pid to control the switching tube Q1.
In the above control method of the single-phase Vienna rectifier, in step S4, if the input voltage v_ac is a positive half period, the calculation formula of the voltage ring error value err0 is as followsIf the input voltage V_ac is a negative half period, the calculation formula of the error value err0 of the voltage loop is +.>
In the above-mentioned control method of the single-phase Vienna rectifier, in step S6, if the input voltage v_ac is a positive half period, the current loop reference value expression is the current loop reference value=feedforward coefficient k×voltage loop output value vout_pid-midpoint voltage equalizing ring output value vmidou_pid, and if the input voltage v_ac is a negative half period, the current loop reference value expression is the current loop reference value=feedforward coefficient k×voltage loop output value vout_pid+midpoint voltage equalizing ring output value vmidou_pid,
in the control method of the single-phase Vienna rectifier, the feedforward coefficient K is calculated according to the formulaWherein the K1 value is constant and is determined according to the load dynamic characteristics.
The control method of the single-phase Vienna rectifier is characterized in that the steps are completed in a main controller, and the main controller collects data, calculates the data and controls the switching tube.
According to the control method of the single-phase Vienna rectifier, the main controller obtains the output value of the current loop to perform SPWM modulation conversion, and controls the on and off of the switching tube Q1.
The control method of the single-phase Vienna rectifier is characterized in that the control operation is PID control operation.
In the control method of the single-phase Vienna rectifier, the positive voltage Vp and the negative voltage Vn in the step S3, the current loop reference value and the input current i_ac in the step S7 are all calculated by errors, and then PID control calculation is performed on the four values.
According to the scheme, the single-phase Vienna rectifier has the advantages that compared with a traditional single-phase PFC exchanger, when the same mains voltage is input, the electric stress of a switching tube and a diode of the single-phase Vienna rectifier is halved, the volumes of an energy storage inductor and a filter capacitor are halved, the material cost is reduced, the efficiency is improved, and the output voltage vo_dc and the output current stability can be ensured when the single-phase power grid is connected.
The control method of the single-phase Vienna rectifier has good dynamic response characteristic and system robustness, and the whole control process is closed-loop control. The whole control method changes the calculation formula of the voltage ring error according to the positive and negative half periods of the mains supply, and uses a midpoint balance control scheme of a midpoint voltage equalizing ring to realize the stabilization of loop control automatic regulation output total voltage and the equalizing of output capacitance; the input and output power balance of the Vienna rectifier and the correction of power factors of the power grid are realized by adopting a power grid feedforward control method, so that the Vienna rectifier has stronger power grid adaptability; the voltage outer loop and current inner loop closed-loop tracking power grid control method is simple in calculation, so that the Vienna rectifier improves power factors and reduces current total harmonic.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments or the description of the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of the internal circuitry of a single-phase Vienna rectifier;
fig. 2 is a schematic diagram of a control method of a single-phase Vienna rectifier.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly or indirectly on the other element. The terms "first," "second," and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features.
As shown in fig. 1, the single-phase Vienna rectifier is externally connected with a single-phase alternating current power grid, inputs voltage v_ac, and outputs high-power high-voltage direct current voltage, namely output voltage vo_dc.
The rectifier bridge includes four end to end's diode, and the rectifier bridge includes first diode D1, second diode D2, third diode D3 and fourth diode D4, and the first input of rectifier bridge sets up between first diode D1 and second diode D2, and the second input of rectifier bridge sets up between third diode D3 and fourth diode D4, and the first output of rectifier bridge sets up between first diode D1 and third diode D3, and the second output of rectifier bridge sets up between second diode D2 and fourth diode D4.
One end of the input voltage V_ac is connected with a first input end of the rectifier bridge through the energy storage inductor L1, the other end of the input voltage V_ac is connected with a second input end of the rectifier bridge, the first output end of the rectifier bridge is respectively connected with an anode of the fifth diode D5 and one end of the current sampling element l_ac, a cathode of the fifth diode D5 is connected with one end of the output voltage vo_dc, the other end of the current sampling element l_ac is connected with one end of the switching tube Q1, the second output end of the rectifier bridge is respectively connected with the other end of the switching tube Q1 and the cathode of the sixth diode D6, and an anode of the sixth diode D6 is connected with the other end of the output voltage vo_dc. The load resistor Rload is provided at both ends of the output voltage vo_dc.
The cathode of the fifth diode D5 is also connected with one end of the first filter capacitor C1, the second input end of the rectifier bridge is also respectively connected with the other end of the first filter capacitor C1 and one end of the second filter capacitor C2, and the other end of the second filter capacitor C2 is respectively connected with the anode of the sixth diode D6 and the other end of the output voltage. The voltage across the first filter capacitor C1 is a positive voltage Vp, and the voltage across the second filter capacitor C2 is a negative voltage Vn. The first filter capacitor C1 and the second filter capacitor C2 reduce the output pulsation degree as much as possible, reduce the alternating current component in the direct current voltage, keep the direct current component, reduce the ripple coefficient of the output voltage and make the waveform smoother.
The switching tube Q1 is a field effect tube, the other end of the current sampling element l_ac is connected with the drain electrode of the field effect tube, the source electrode of the field effect tube is respectively connected with the second output end of the rectifier bridge and the cathode of the sixth diode D6, and the grid electrode of the field effect tube is connected with the main controller to output SPWM signals.
Compared with the traditional single-phase PFC (power factor correction) exchanger, the single-phase Vienna rectifier has the advantages that the electric stress of a switching tube and a diode is halved, the volumes of an energy storage inductor and a filter capacitor are halved, the material cost is reduced, the efficiency is improved, and the output voltage vo_dc and the output current are ensured to be stable when a single-phase power grid is connected.
A control method of a single-phase Vienna rectifier is shown in fig. 2, and comprises the following steps:
s1: the main controller collects the input voltage v_ac, the input current i_ac, the positive voltage Vp and the negative voltage Vn of the Vienna rectifier.
S2: the master controller calculates an effective value v_acrms of the input voltage and a feedforward coefficient value K. Wherein, the feedforward coefficient K is calculated as followsThe K1 value is constant and is determined according to the dynamic characteristics of the load.
S3: and the main controller performs error operation on the positive voltage Vp and the negative voltage Vn and then performs PID control operation to obtain a midpoint voltage equalizing ring output value vmidou_pid.
S4: the main controller judges the positive and negative periods of the input voltage V_ac and calculates the voltage loop error value err0. If the input voltage V_ac is a positive half period, the calculation formula of the error value err0 of the voltage loop isIf the input voltage V_ac is a negative half period, the calculation formula of the error value err0 of the voltage loop is +.>
S5: and the main controller performs PID control operation on the voltage loop error value err0 to obtain a voltage loop output value Vout_pid.
S6: and the main controller determines a current loop reference value expression according to the positive and negative periods of the input voltage V_ac to obtain a current loop reference value. If the input voltage v_ac is a positive half cycle, the current loop reference expression is current loop reference=feedforward coefficient k×voltage loop output value vout_pid-midpoint voltage equalizing ring output value vmidou_pid, and if the input voltage v_ac is a negative half cycle, the current loop reference expression is current loop reference=feedforward coefficient k×voltage loop output value vout_pid+midpoint voltage equalizing ring output value vmidou_pid.
S7: and the main controller performs error operation on the current loop reference value and the input current I_ac and then performs PID control operation to obtain a current loop output value Iout_pid.
S8: the main controller performs SPWM modulation conversion on the output value Iout_pid of the current loop and controls the on and off of the switching tube Q1. The step stabilizes the output power of the Vienna rectifier, balances the input and output power components, and corrects the power factor of the single-phase power grid.
The control method of the single-phase Vienna rectifier has good dynamic response characteristic and system robustness, and the whole control process is closed-loop control. The whole control method changes the calculation formula of the voltage ring error according to the positive and negative half periods of the mains supply, and uses a midpoint balance control scheme of a midpoint voltage equalizing ring to realize the stabilization of loop control automatic regulation output total voltage and the equalizing of output capacitance; the input and output power balance of the Vienna rectifier and the correction of power factors of the power grid are realized by adopting a power grid feedforward control method, so that the Vienna rectifier has stronger power grid adaptability; the voltage outer loop and current inner loop closed-loop tracking power grid control method is simple in calculation, so that the Vienna rectifier improves power factors and reduces current total harmonic.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (9)
1. A single-phase Vienna rectifier is characterized in that,
one end of the input voltage V_ac is connected with a first input end of the rectifier bridge through an inductor L1, the other end of the input voltage V_ac is connected with a second input end of the rectifier bridge,
the first output end of the rectifier bridge is respectively connected with the anode of the fifth diode D5 and one end of the current sampling element l_ac,
the cathode of the fifth diode D5 is connected to one end of the output voltage Vo dc,
the other end of the current sampling element l-ac is connected with one end of the switching tube Q1,
the second output end of the rectifier bridge is respectively connected with the other end of the switch tube Q1 and the cathode of the sixth diode D6,
the anode of the sixth diode D6 is connected with the other end of the output voltage vo_dc;
the control method comprises the following steps:
s1: the input voltage V ac, input current I ac, positive voltage Vp and negative voltage Vn are collected,
s2: calculates the effective value V_acRMS and feedforward coefficient value K of the input voltage,
s3: the positive voltage Vp and the negative voltage Vn are controlled to obtain a midpoint voltage equalizing ring output value Vmidou _ pid,
s4: judging the positive and negative periods of the input voltage V_ac, calculating the voltage ring error value err0,
s5: the error value err0 of the voltage loop is controlled to obtain the output value Vout_pid of the voltage loop,
s6: determining a current loop reference value expression according to the positive and negative periods of the input voltage V_ac to obtain a current loop reference value,
s7: the current loop reference value and the input current I_ac are subjected to control operation to obtain a current loop output value Iout_pid,
s8: and SPWM modulation is carried out on the current loop output value Iout_pid to control the switching tube Q1.
2. The single phase Vienna rectifier of claim 1 wherein the rectifier bridge comprises four diodes connected end to end.
3. The single-phase Vienna rectifier of claim 2, wherein the rectifier bridge comprises a first diode D1, a second diode D2, a third diode D3, and a fourth diode D4, the first input of the rectifier bridge is disposed between the first diode D1 and the second diode D2, the second input of the rectifier bridge is disposed between the third diode D3 and the fourth diode D4, the first output of the rectifier bridge is disposed between the first diode D1 and the third diode D3, and the second output of the rectifier bridge is disposed between the second diode D2 and the fourth diode D4.
4. The single-phase Vienna rectifier of claim 1, wherein the cathode of the fifth diode D5 is further connected to one end of a first filter capacitor C1, the second input terminal of the rectifier bridge is further connected to the other end of the first filter capacitor C1 and one end of a second filter capacitor C2, and the other end of the second filter capacitor C2 is connected to the anode of the sixth diode D6 and the other end of the output voltage, respectively.
5. A single-phase Vienna rectifier as claimed in claim 1, characterized in that the output voltage vo_dc is provided with a load resistor Rload across.
6. The single-phase Vienna rectifier of claim 1, wherein in step S4, if the input voltage V_ac is positive half-cycle, the voltage loop error value err0 is calculated asIf the input voltage V_ac is a negative half period, the calculation formula of the error value err0 of the voltage loop is +.>
7. The single-phase Vienna rectifier of claim 1, wherein in step S6, if the input voltage v_ac is a positive half cycle, the current loop reference expression is current loop reference = feedforward coefficient K x voltage loop output value vout_pid-midpoint voltage equalizing ring output value vmidou_pid, and if the input voltage v_ac is a negative half cycle, the current loop reference expression is current loop reference = feedforward coefficient K x voltage loop output value vout_pid + midpoint voltage equalizing ring output value vmidou_pid.
8. The single-phase Vienna rectifier of claim 1, wherein the feedforward coefficient K is calculated by the formulaWherein the K1 value is constant and is determined according to the load dynamic characteristics.
9. The single-phase Vienna rectifier of claim 1, wherein the main controller obtains the output value of the current loop to perform SPWM modulation transformation, and controls the on and off of the switching tube Q1.
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| CN103973136A (en) * | 2014-04-24 | 2014-08-06 | 华为技术有限公司 | VIENNA rectifier current sampling device and method |
| CN106849702A (en) * | 2017-04-12 | 2017-06-13 | 哈尔滨理工大学 | A kind of Novel rotary rectifier with malfunction monitoring function |
| CN106849705A (en) * | 2017-03-24 | 2017-06-13 | 三峡大学 | A kind of current predictive control method based on single-phase Vienna rectifiers |
| CN110034696A (en) * | 2019-03-27 | 2019-07-19 | 南京航空航天大学 | A kind of current sample method for three-phase tri-level VIENNA rectifier |
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| US8804388B2 (en) * | 2010-12-06 | 2014-08-12 | Hamilton Sundstrand Corporation | Active rectification control |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103973136A (en) * | 2014-04-24 | 2014-08-06 | 华为技术有限公司 | VIENNA rectifier current sampling device and method |
| CN106849705A (en) * | 2017-03-24 | 2017-06-13 | 三峡大学 | A kind of current predictive control method based on single-phase Vienna rectifiers |
| CN106849702A (en) * | 2017-04-12 | 2017-06-13 | 哈尔滨理工大学 | A kind of Novel rotary rectifier with malfunction monitoring function |
| CN110034696A (en) * | 2019-03-27 | 2019-07-19 | 南京航空航天大学 | A kind of current sample method for three-phase tri-level VIENNA rectifier |
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