CN111865066A - Control method and controller of air conditioner power factor corrector and power factor corrector - Google Patents
Control method and controller of air conditioner power factor corrector and power factor corrector Download PDFInfo
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- CN111865066A CN111865066A CN202010686483.0A CN202010686483A CN111865066A CN 111865066 A CN111865066 A CN 111865066A CN 202010686483 A CN202010686483 A CN 202010686483A CN 111865066 A CN111865066 A CN 111865066A
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
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- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0009—Devices or circuits for detecting current in a converter
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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- 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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Abstract
The invention belongs to the field of electronic circuits, and discloses a control method of an air conditioner power factor corrector, a controller and the power factor corrector, wherein two sampling resistors arranged below a switching tube send collected resistance signals to the controller through two operational amplifiers; the controller respectively judges whether the duty ratio value of a period on the two-phase switching tube is smaller than the duty ratio corresponding to the minimum sampling window time, if so, the duty ratio is directly output, current closed-loop operation is not carried out, and if not, the current closed-loop operation is carried out; the controller is provided with two current loops, and the two current loops use the same reference value to realize automatic current sharing of the two switching tubes. The invention can realize automatic current sharing of two switching tubes, and has high reliability and small harmonic current; the current loop correction method can rapidly determine the zero pole of the compensator, objectively and comprehensively evaluate the stability of the current loop of the power factor corrector, and ensure that the high-power variable frequency air conditioner works reliably.
Description
Technical Field
The invention belongs to the field of electronic circuits, and particularly relates to a control method of an air conditioner power factor corrector, a controller and the power factor corrector.
Background
At present, in most of variable frequency air conditioner two-phase staggered power factor correction control, a sampling resistor is placed at the ground end of a direct current bus, and in a high-power occasion (4000-.
In the scheme of arranging the sampling resistors below the two switching tubes, when the switching tubes are switched off or the switching-on time is too short, the current cannot be acquired or the current acquisition is inaccurate.
Through the above analysis, the problems and defects of the prior art are as follows: (1) the problem that the control of a staggered Power Factor Corrector (PFC) of an existing high-power (4000W-5000W) frequency conversion outdoor unit is unreliable exists.
(2) The current loop compensator of the existing staggered power factor corrector has the setting difficulty and low setting efficiency.
The significance of solving the problems and the defects is as follows:
the method solves the difficulty of setting the current loop compensator of the staggered power factor corrector, and improves the setting efficiency. The reliability of the interleaved power factor corrector is improved.
The adaptability of the PFC to the power grid with poor power supply quality can be enhanced.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a control method and a controller of an air conditioner power factor corrector and the power factor corrector.
The invention is realized in this way, a control method for air conditioner power factor corrector includes:
two sampling resistors arranged below the switching tube send collected resistance signals to the controller through two operational amplifiers;
the controller respectively judges whether the duty ratio value of a period on the two-phase switching tube is smaller than the duty ratio corresponding to the minimum sampling window time, if so, the current loop operation is not carried out, and the controller directly outputs the duty ratio; if the duty ratio is larger than or equal to the duty ratio, performing current loop operation;
the two current loops use the same reference value, and the currents of the two switching tubes are fed back to the controller through the operational amplifier, so that the automatic current equalization of the two switching tubes is realized. The current loop adopts a pole-zero control algorithm.
Further, the pole-zero setting method includes:
firstly, when two paths of staggered power factor correctors are set, firstly, one phase is cut off, the power factor corrector is enabled to work in a single-phase state, an injection resistor 20 omega is connected between the output of a sampling operational amplifier and a resistor capacitor in series, the output of a frequency response analyzer is connected to two ends of the injection resistor, the inputs 1 and 2 of the frequency response analyzer are respectively connected to two ends of the injection resistor, the reference of the input is connected to the ground end of a circuit, the output of the frequency response analyzer injects sine signals with different frequencies into a loop, the input 2 of the loop analyzer measures the injection signals, the input 1 of the loop analyzer measures the response signals of the loop, and the frequency response analyzer draws an open-loop baud graph of a current loop of the power factor corrector according to the ratio of the response signals to the injection signals;
Step two, starting from a simple single-zero single-pole point, adding a phase advance link if the current loop zero-pole compensator of the power factor corrector does not meet the requirements of crossing frequency and phase margin; after the pole zero is selected, drawing a bode diagram of a continuous domain of a current loop pole-zero compensator of the power factor corrector, and preliminarily evaluating whether the conditions of crossing frequency and phase margin can be met by combining the bode diagram of the frequency response analyzer;
and step three, bilinear discretization is used for the preliminarily selected current loop pole-zero compensator of the power factor corrector, a bode graph of a discrete domain is drawn and compared with the bode graph of a continuous domain, and if the difference is not too large, the discretized expression is written into the controller.
Further, in the second step, the current loop bode diagram has different crossing frequencies and phase margins under different alternating current input voltages and input currents, and the input currents with different alternating current input voltages need to be subjected to parameter segmentation, and in the parameter segmentation, a gain G adjusted according to the alternating current input voltage and the input current is added behind a current loop zero-pole compensator of the power factor corrector.
Further, in the second step, the crossing frequency of the current loop bode diagram is 2-3 kHZ, and the phase margin is 80 DEG
Further, in the third step, the current loop dispersion compensator pulse transfer function c (z) is shown as follows:
further, in the third step, the frequency response analyzer is used again to draw a baud chart of a current loop in an actual system, whether the requirements of crossing frequency and phase margin are met is judged, if yes, setting is finished, and if not, the second step is returned;
and after the third step, recovering the two-phase staggered operation.
Further, on the occasion of using the power grid difference, when the given value of the current loop is obtained, the sampling value of the alternating current input voltage is filtered, the filtering bandwidth is 1kHZ, the filter uses an infinite impulse response form, and the discrete domain pulse transfer function L (Z) is shown as the following formula:
the invention also aims to provide a controller for implementing the control method of the air conditioner power factor corrector.
The invention also aims to provide a high-power frequency conversion outdoor unit staggered power factor corrector for implementing the control method of the air conditioner power factor corrector.
The invention also aims to provide an air conditioner for implementing the control method of the air conditioner power factor corrector.
By combining all the technical schemes, the invention has the advantages and positive effects that: aiming at the control of a two-phase staggered Power Factor Corrector (PFC) of a high-power air conditioner, the hardware of the invention is that sampling resistors are arranged below two switching tubes, signals of the two sampling resistors are sent to a controller through two operational amplifiers, the controller is provided with two current loops, and the two current loops use the same reference value, so that the two switching tubes automatically realize current sharing.
Because the sampling resistor is arranged below the switching tube, when the switching tube is turned off or the turn-on time is too short, the sampling resistor cannot acquire current or the acquired current is inaccurate, when the two-phase (A phase and B phase) current loop operation is carried out, the controller firstly and respectively judges whether the duty ratio value of a period on the two-phase switching tube is smaller than the duty ratio (Dmin) corresponding to the minimum sampling window time (Smin), if so, the current loop operation is not carried out, and the controller directly outputs the Dmin; and if the current is greater than or equal to Dmin, performing current loop operation.
Aiming at the difficult and time-consuming parameter setting of a zero pole compensator of a current loop of a power factor corrector, the invention provides a zero pole setting method, for two paths of staggered power factor correctors, one path is firstly disconnected during setting, the power factor corrector works in a single-phase state, an injection resistor is connected between the output of a sampling operational amplifier and a Resistor Capacitor (RC) in series, the output of a frequency response analyzer is connected at two ends of the injection resistor, the frequency response analyzer measures an injection signal and a response signal, and an open-loop baud (bode) diagram of the current loop of the power factor corrector is drawn according to the ratio of the response signal to the injection signal, so that the current waveform is sufficiently sinusoidal and stable, the crossing frequency is required to be 2kHZ-3kHZ, and the phase margin is about 80 degrees. And selecting a proper compensator and then writing the compensator into the controller through bilinear discretization.
The current loop given value needs to use an alternating current input voltage instantaneous sampling value, and aiming at the use occasions with poorer power grids, the alternating current input voltage instantaneous sampling value is filtered, the filtering bandwidth is 1kHZ, and the filter uses an Infinite Impulse Response (IIR) form.
By the method, the accuracy of current sampling of the two switching tubes can be enhanced, input current waveform distortion is not brought, and the reliability of PFC control is improved.
The control scheme of the interleaving Power Factor Corrector (PFC) has the advantages of automatic current sharing, high reliability and small harmonic current. The proposed current loop correction method can rapidly determine the zero pole of the compensator, and can objectively and comprehensively evaluate the stability of the current loop of the power factor corrector, so that the high-power (4000W-5000W) frequency conversion outdoor unit can reliably work.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained from the drawings without creative efforts.
Fig. 1 is a schematic diagram of a circuit provided by an embodiment of the invention.
In the figure: 1. a rectifier bridge; 2. a phase A current sampling resistor; 3. and B phase current sampling resistance.
Fig. 2 is a flowchart of a two-phase current loop operation according to an embodiment of the present invention.
Fig. 3 is a diagram of measured waveforms provided by an embodiment of the present invention.
Fig. 4 is an expanded schematic diagram of an AB two-phase current sampling waveform provided by an embodiment of the present invention.
Fig. 5 is a schematic wiring diagram provided by an embodiment of the present invention.
In the figure: 4. a frequency response analyzer; 5. outputting the signal; 6. inputting a signal 1; 7. a signal input 2; 8. a current sampling resistor; 9. an operational amplifier; 10. rinj
Fig. 6 is a block diagram of a two-phase current loop control provided by an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In view of the problems in the prior art, the present invention provides a control method, a controller and a power factor corrector for an air conditioner, and the present invention is described in detail with reference to the accompanying drawings.
The invention provides a control method of an air conditioner power factor corrector, which comprises the following steps:
two sampling resistors arranged below the switching tube send collected resistance signals to the controller through two operational amplifiers.
The controller respectively judges whether the duty ratio value of a period on the two-phase switching tube is smaller than the duty ratio corresponding to the minimum sampling window time, if so, the current loop operation is not carried out, and the controller directly outputs the duty ratio; and if the duty ratio is more than or equal to the duty ratio, performing current loop operation.
The two current loops use the same reference value, and the currents of the two switching tubes are fed back to the controller through the operational amplifier, so that the automatic current equalization of the two switching tubes is realized. The current loop adopts a pole-zero control algorithm.
As shown in fig. 1, a schematic circuit diagram of the present invention is provided, and for the control of a two-phase interleaved power factor corrector of a high-power variable frequency air conditioner (4000W-5000W), the hardware of the present invention is to set sampling resistors below two switching tubes, so as to avoid the problem of high temperature rise of the resistors caused by setting sampling resistors at the ground end of a dc bus.
Two paths of sampling resistance signals are sent to the controller through two paths of operational amplifiers, the controller is provided with two paths of current loop compensators, closed-loop control of currents of two paths of switching tubes can be realized, the two paths of current loops use the same reference value, and thus the two paths of switching tubes automatically realize current sharing.
As shown in fig. 2, which is a flow chart of a two-phase current loop operation, the other phase (phase B) performs the same process. Because the sampling resistor is arranged below the switching tube, when the switching tube is turned off or the turn-on time is too short, the sampling resistor cannot acquire current or the acquired current is inaccurate, when the two-phase (A phase and B phase) current loop operation is carried out, the controller firstly and respectively judges whether the duty ratio value of a period on the two-phase switching tube is smaller than the duty ratio (Dmin) corresponding to the minimum sampling window time (Smin), if so, the current loop operation is not carried out, and the controller directly outputs the Dmin; and if the current is greater than or equal to Dmin, performing current loop operation.
In addition, after the processing according to the flow chart shown in fig. 2, the first duty ratio of the AB two-phase switching tube is Dmin under any condition in the starting process of the power factor corrector, so that the overshoot of the starting current is effectively prevented.
As shown in fig. 3, the actually measured waveform diagram of the present invention is a sine waveform of an Alternating Current (AC) input current, and the sampling waveform envelope of the phase a current is substantially the same as the sampling envelope of the phase B current, so that the current equalizing effect of the phase AB is good.
Fig. 4 shows an expanded view of the waveform of the AB two-phase current sampling, wherein the AB two-phase current instantaneous sampling values are staggered by 180 °.
In the invention, aiming at the problem that parameter setting of a current loop pole-zero compensator of a power factor corrector is difficult and time-consuming, the invention provides a compensator pole-zero adjusting step:
the method comprises the following steps: fig. 5 shows a schematic wiring diagram. For two-way staggered power factor corrector, when the whole timing is set, firstly one phase is cut off, the power factor corrector is enabled to work in a single-phase state, an injection resistor (Rinj) 20 omega is connected between the output of a sampling operational amplifier and a Resistor Capacitor (RC) in series, the output of a frequency response analyzer is connected at two ends of the injection resistor, the inputs 1 and 2 of the frequency response analyzer are respectively connected at two ends of the injection resistor, the reference of the input is connected at the ground end of a circuit, the output of the frequency response analyzer injects sine signals with different frequencies into a loop, the input 2 of the loop analyzer measures the injection signals, the input 1 of the loop analyzer measures the response signals of the loop, and the frequency response analyzer draws an open-loop baud (bode) diagram of a current loop of the power factor corrector according to the ratio of the response signals to the injection signals.
And step two, in order to obtain enough sinusoidal input current and ensure stability, the crossing frequency of a current ring baud (bode) diagram is required to be 2-3 kHZ, and the phase margin is about 80 degrees. The compensator should start from a simple single-zero unipolar point (i.e. PI: proportional integral), and if the requirements of crossing frequency and phase margin are not met, a phase lead link needs to be added. After the pole zero is selected, drawing a bode (Bode) diagram of a continuous domain of the compensator, and preliminarily evaluating whether the requirements of crossing frequency and phase margin can be met by combining the bode (Bode) diagram of the frequency response analyzer.
And step three, bilinear discretization is used for the initially selected compensator, a bode graph of a discrete domain is drawn and compared with the bode graph of the continuous domain, and if the difference is not too large, the discretized expression is written into the controller. The current loop dispersion compensator pulse transfer function C (Z) is given by:
and (3) drawing a baud (bode) diagram of a current loop in the actual system by using the frequency response analyzer again, and judging whether the requirements of crossing frequency and phase margin are met, if so, finishing setting, and if not, returning to the step 2.
And step four, recovering the two-phase staggered operation.
In the present invention, as shown in fig. 6, a two-phase current loop control block diagram is shown, a current loop waveform (bode) diagram has different crossing frequencies and phase margins under different ac input voltages and input currents, so that parameter segmentation is required for the input currents and the different ac input voltages, and in order to make the segmentation easily realized, a gain G capable of adjusting the input currents according to the ac input voltages is added behind a zero-pole compensator C.
The current loop given value needs to use an alternating current input voltage instantaneous sampling value, the alternating current input voltage sampling value is filtered aiming at the use occasion with poor power grid, the filtering bandwidth is 1kHZ, and the filter uses an Infinite Impulse Response (IIR) form. The discrete domain pulse transfer function L (Z) is shown as follows:
In the description of the present invention, "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The above description is only for the purpose of illustrating the present invention and the appended claims are not to be construed as limiting the scope of the invention, which is intended to cover all modifications, equivalents and improvements that are within the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A control method of an air conditioner power factor corrector is characterized by comprising the following steps:
Two sampling resistors arranged below the switching tube send collected resistance signals to the controller through two operational amplifiers;
the controller respectively judges whether the duty ratio value of a period on the two-phase switching tube is smaller than the duty ratio corresponding to the minimum sampling window time, if so, the current loop operation is not carried out, and the controller directly outputs the duty ratio; if the duty ratio is larger than or equal to the duty ratio, performing current loop operation;
the two current loops use the same reference value, and the currents of the two switching tubes are fed back to the controller through the operational amplifier, so that the automatic current equalization of the two switching tubes is realized.
2. The air conditioner power factor corrector control method of claim 1, wherein the pole-zero setting method comprises:
firstly, when two paths of staggered power factor correctors are set, firstly, one phase is cut off, the power factor corrector is enabled to work in a single-phase state, an injection resistor 20 omega is connected between the output of a sampling operational amplifier and a resistor capacitor in series, the output of a frequency response analyzer is connected to two ends of the injection resistor, the inputs 1 and 2 of the frequency response analyzer are respectively connected to two ends of the injection resistor, the reference of the input is connected to the ground end of a circuit, the output of the frequency response analyzer injects sine signals with different frequencies into a loop, the input 2 of the loop analyzer measures the injection signals, the input 1 of the loop analyzer measures the response signals of the loop, and the frequency response analyzer draws an open-loop baud graph of a current loop of the power factor corrector according to the ratio of the response signals to the injection signals;
Step two, starting from a simple single-zero single-pole point, adding a phase advance link if the current loop zero-pole compensator of the power factor corrector does not meet the requirements of crossing frequency and phase margin; after the pole zero is selected, drawing a bode diagram of a continuous domain of a current loop pole-zero compensator of the power factor corrector, and preliminarily evaluating whether the conditions of crossing frequency and phase margin can be met by combining the bode diagram of the frequency response analyzer;
and step three, bilinear discretization is used for the preliminarily selected current loop pole-zero compensator of the power factor corrector, a bode graph of a discrete domain is drawn and compared with the bode graph of a continuous domain, and if the difference is not too large, the discretized expression is written into the controller.
3. The control method of the power factor corrector of the air conditioner as claimed in claim 2, wherein in the second step, the current loop bode diagram has different crossing frequencies and phase margins under different AC input voltages and input currents, and the parameter segmentation is carried out on the different AC input voltages and the input currents, and in the parameter segmentation, a gain G adjusted according to the AC input voltage and the input currents is added behind the current loop zero-pole compensator of the power factor corrector.
4. The control method of the air conditioner power factor corrector as set forth in claim 2, wherein in the second step, the cross-over frequency of the current loop baud chart is 2kHZ-3kHZ, and the phase margin is 80 °.
5. The control method of the air-conditioning power factor corrector as set forth in claim 2, wherein in the third step, the pulse transfer function C (Z) of the current loop dispersion compensator is as follows:
6. the control method of the power factor corrector of the air conditioner according to claim 2, wherein in the third step, the frequency response analyzer is used again to draw a baud chart of a current loop in an actual system, whether the requirements of crossing frequency and phase margin are met is judged, if yes, setting is finished, and if not, the second step is returned;
and after the third step, recovering the two-phase staggered operation.
7. The air conditioner power factor corrector control method of claim 1, wherein said current loop employs a pole-zero control algorithm;
in the use occasion of power grid difference, when a given value of a current loop is obtained, filtering is carried out on a sampling value of an alternating current input voltage, the filtering bandwidth is 1kHZ, the filter uses an infinite impulse response form, and a discrete domain pulse transfer function L (Z) is shown as the following formula:
8. A controller for implementing the control method of the air conditioner power factor corrector as claimed in any one of claims 1 to 7.
9. A high-power frequency conversion outdoor unit staggered power factor corrector for implementing the control method of the air conditioner power factor corrector as claimed in any one of claims 1 to 7.
10. An air conditioner implementing the control method of the air conditioner power factor corrector as claimed in any one of claims 1 to 7.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112803748A (en) * | 2021-01-29 | 2021-05-14 | 上海瞻芯电子科技有限公司 | Fixed feedforward control method for power factor correction circuit |
| CN113864992A (en) * | 2021-11-02 | 2021-12-31 | 珠海格力电器股份有限公司 | PFC circuit parameter adjusting method and device in air conditioner controller and air conditioner |
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