CN114465548A - Low-cost self-boosting power converter for switched reluctance motor and control strategy thereof - Google Patents
Low-cost self-boosting power converter for switched reluctance motor and control strategy thereof Download PDFInfo
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- 238000011217 control strategy Methods 0.000 title claims abstract description 12
- 230000005284 excitation Effects 0.000 claims abstract description 52
- 239000003990 capacitor Substances 0.000 claims abstract description 20
- 238000004146 energy storage Methods 0.000 claims abstract description 11
- 238000004804 winding Methods 0.000 claims description 21
- 238000005086 pumping Methods 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 230000005347 demagnetization Effects 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims 1
- 238000001514 detection method Methods 0.000 abstract description 7
- 238000000034 method Methods 0.000 abstract description 5
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
- H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
- H02P25/08—Reluctance motors
- H02P25/092—Converters specially adapted for controlling reluctance motors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
- H02P23/26—Power factor control [PFC]
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
- H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
- H02P25/08—Reluctance motors
- H02P25/098—Arrangements for reducing torque ripple
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Abstract
The invention relates to the technical field of motors, and provides a low-cost self-boosting power converter for a switched reluctance motor and a control strategy thereof, wherein the power converter comprises a direct-current power supply unit, an energy storage capacitor, 8 controllable switching tubes, 6 diodes and 2 current sensors; the power converter has 5 working modes, such as a high-voltage excitation mode, a low-voltage excitation mode, an upper zero-voltage follow current mode, a lower zero-voltage follow current mode, a negative high-voltage follow current mode and the like; the control strategy of the power converter adopts two current sensors to realize the detection of four-phase current, and effectively adjusts 5 working modes according to a conduction interval, the voltage of an energy storage capacitor and the node temperature of a device, thereby realizing the orderly normal operation of the power converter; meanwhile, the high-voltage excitation mode and the low-voltage excitation mode exist simultaneously, so that the fault-tolerant capability can be effectively improved, and the method has good engineering application value.
Description
Technical Field
The invention relates to the technical field of motors, in particular to a low-cost self-boosting power converter for a switched reluctance motor and a control strategy thereof.
Background
With the gradual popularization of the switched reluctance motor in the application occasions of new energy automobiles, the problems of large torque pulsation and low system efficiency of the switched reluctance motor become decisive factors for restricting the development of the switched reluctance motor. In order to solve the problems of large torque pulsation and low system efficiency, scholars at home and abroad obtain good application effects by designing a novel motor structure, a novel power converter topology and a novel control algorithm mode. The novel power converter and the novel control algorithm are combined without changing the topology of the motor, and the novel power converter has a good application prospect. However, due to the highly nonlinear characteristic and the pulse power supply mode of the switched reluctance motor, a new power converter and control strategy gradually become a challenge for improving the performance of the switched reluctance motor. Although researches of scholars at home and abroad show that the operation efficiency of the switched reluctance motor system can be improved by increasing the bus voltage, the control flexibility is increased, and the torque pulsation is reduced. However, the existing boost power converters all need to add additional power devices and passive devices, and the operation cost of the system is increased. It is therefore a considerable problem to reduce the number and cost of components used in a system while pumping up the bus voltage of a power converter.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, an object of the present invention is to provide a low-cost self-boosting power converter for a switched reluctance motor and a control strategy thereof, so as to reduce the number of components and system cost, and improve response speed, remote efficiency and power density.
To achieve the above object, an embodiment of the present invention provides a low-cost self-boosting power converter for a switched reluctance motor and a control strategy thereof, including: the device comprises a direct-current power supply unit, an energy storage capacitor, 8 controllable switching tubes, 6 diodes and 2 Hall current sensors; the direct-current power supply unit can be connected with a storage battery or a switching power supply; the cathode of the energy storage capacitor is connected with the anode of a direct current power supply and the drains of controllable switch tubes S1 and S2, the source of S1 is connected with the cathode of a diode D1 and the source of S7 and the anodes of A-phase and C-phase windings, the source of S2 is connected with the cathode of a diode D2 and the source of S8 and the anodes of B-phase and D-phase windings, the anode of the energy storage capacitor is connected with the cathodes of diodes D3, D4, D5 and D6 and the drains of controllable switch tubes S7 and S8, the cathode of the power supply is connected with the anode of a diode D1 and the anode of D2, the source of the controllable switch tube S3 and the source of S4, the source of S5 and the source of S6, the drain electrode of the controllable switch tube S3 is connected with the anode of the diode D3 and the cathode of the A-phase winding, the drain electrode of the controllable switch tube S4 is connected with the anode of the diode D4 and the cathode of the C-phase winding, the drain electrode of the controllable switch tube S5 is connected with the anode of the diode D5 and the cathode of the phase B winding, and the drain electrode of the controllable switch tube S6 is connected with the anode of the diode D6 and the cathode of the phase D winding; a hall current sensor L1 for measuring a-phase and C-phase currents, and a hall current sensor L2 for measuring a B-phase and D-phase currents; the controllable switch tube is a common MOSFET or IGBT.
Description of the working principle: the converter has five working modes, namely a high-voltage excitation mode, a low-voltage excitation mode, an upper tube zero-voltage follow current mode, a lower tube zero-voltage follow current mode and a negative high-voltage follow current mode. The phase A is specifically shown below. When the phase A is excited at high voltage, the phase A current is rapidly increased by exciting the phase A through opening S7 and S3. When the phase A is excited at low voltage, the phase S7 is switched off, and the phase A is excited by switching on the phases S1 and S3. When the phase a current freewheels at zero voltage, the phase a current is turned on by turning on S7 to turn on D3, and the zero-cross voltage free-wheeling is reduced. When the A-phase lower tube has zero voltage freewheeling, the D1 is turned on by turning on the S3, so that the A-phase current freewheeling is reduced by the zero voltage freewheeling. When the phase A is in negative high-voltage freewheeling, the phase A current can quickly take effect to zero by conducting D1 and D3.
The detection of the four-phase current can be achieved by two hall current sensors L1 and L2 at the same time. In order to effectively explain the phase current detection process, firstly, when the rotor position is positioned between the turn-on angle and the turn-off angle, the rotor position is defined as a turn-on interval; when the rotor position is outside the on-interval and the phase current is not zero, it is defined as the off-interval. The current detection process is divided into two conditions, the first one is a single-phase working mode, and only one phase has current at the same time; the second is a two-phase mode of operation, with two phases having current at the same time. When the single-phase working mode is adopted, taking the phase A as an example, when the rotor position is positioned in the phase A conduction interval and the phase A shutdown interval, the phase A current (i)a) In high-voltage excitation mode, low-voltage excitation mode and zero upper voltageThe freewheeling mode, the lower zero-voltage freewheeling mode and the negative high-voltage freewheeling mode only pass through L1, and the specific value is as shown in formula (1).
ia＝iL1 (1)
In formula (1) iL1Is the measurement value of the hall current sensor L1.
In the two-phase operation mode, the phase A current (i) is switched on when the phase A and the phase B are the samea) The phase B current (i) passes through only L1 in the high-voltage excitation mode, the low-voltage excitation mode, the upper zero-voltage follow current mode, the lower zero-voltage follow current mode and the negative high-voltage follow current modeb) L2 only is passed in all of the high voltage excitation mode, the low voltage excitation mode, the upper zero voltage freewheel mode, the lower zero voltage freewheel mode, and the negative high voltage freewheel mode, so iaAnd ibThe specific value is shown in formula (2).
The provided control strategy comprises a rotating speed control loop, a current control loop and a capacitance voltage control loop, wherein the current control loop and the voltage control loop are controlled by hysteresis loops, reference current is output by rotating speed control, and the reference current and current of each phase measured by two current sensors are input into a current hysteresis controller to output driving signals of each phase; high-level signals of driving signals of all phases select high-voltage excitation and low-voltage excitation through the output of a voltage ring, the high-voltage excitation mode is used for reducing voltage, the voltage of a capacitor is prevented from being overhigh, the low-voltage excitation can ensure that the voltage of the capacitor is unchanged, and the rapid demagnetization is realized; the capacitor is charged by demagnetized energy, so that pumping of voltage is realized; when each phase of driving signals are at a low level, the three-dimensional thermal circuit model or the actually measured temperature of each power device is used for determining the upper zero voltage follow current mode or the lower zero voltage follow current mode, if the temperature of S7 is greater than S3 and S4, the upper zero voltage follow current mode is selected, and if not, the lower zero voltage follow current mode is selected, so that the reliability of the system is improved.
The converter can improve the fault-tolerant capability of the system, and the power converter has two working modes of high-voltage excitation and low-voltage excitation, so that the normal operation of each phase winding when the controllable switching tubes S1, S2, S7 or S8 are open-circuited can be ensured through the mutual conversion of the low-voltage excitation and the high-voltage excitation, and the fault-tolerant capability of the system is improved. For example, when S1 is open, S7 may be turned on to ensure normal excitation of phase a in order to ensure excitation of phase a.
The invention has the beneficial effects that: the low-cost self-boosting power converter topology provided by the invention can reduce the use number of components and system cost, and improve the response speed, the remote efficiency and the reliability.
Drawings
Fig. 1 is a topology structure diagram of a low-cost self-boosting power converter according to embodiment 1 of the present invention.
Fig. 2 is a schematic diagram of a high-voltage excitation mode current path according to embodiment 1 of the present invention.
Fig. 3 is a schematic diagram of a low-voltage excitation mode current path according to embodiment 1 of the present invention.
Fig. 4 is a schematic diagram of a current path in a high-tube zero-voltage freewheeling mode according to embodiment 1 of the present invention.
Fig. 5 is a schematic view of a current path in the low-tube zero-voltage freewheel mode in embodiment 1 of the present invention.
Fig. 6 is a schematic view of a negative high-voltage freewheel mode current path according to embodiment 1 of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
An enhanced miller power converter for a switched reluctance motor according to an embodiment of the present invention is described below with reference to the accompanying drawings.
Fig. 1 is a low-cost self-boosting type power converter for a four-phase switched reluctance motor according to an embodiment of the present invention. As shown in fig. 1, the low-cost self-boosting type power converter for a four-phase switched reluctance motor according to an embodiment of the present invention includes: the device comprises a direct-current power supply unit, an energy storage capacitor, 8 controllable switching tubes, 6 diodes and 2 Hall current sensors; the direct-current power supply unit can be connected with a storage battery or a switching power supply; the cathode of the energy storage capacitor is connected with the anode of a direct current power supply and the drains of controllable switching tubes S1 and S2, the source of S1 is connected with the cathode of a diode D1, the source of S7 and the anodes of A-phase and C-phase windings, the source of S2 is connected with the cathode of the diode D2, the source of S8 and the anodes of B-phase and D-phase windings, the anode of the energy storage capacitor is connected with the cathodes of diodes D3, D4, D5 and D6 and the drains of controllable switching tubes S7 and S8, the cathode of the power supply is connected with the anode of diodes D1, the anode of D2, the source of controllable switching tube S3, the source of S4, the source of S5 and the source of S6, the drain electrode of the controllable switch tube S3 is connected with the anode of the diode D3 and the cathode of the A-phase winding, the drain electrode of the controllable switch tube S4 is connected with the anode of the diode D4 and the cathode of the C-phase winding, the drain electrode of the controllable switch tube S5 is connected with the anode of the diode D5 and the cathode of the phase B winding, and the drain electrode of the controllable switch tube S6 is connected with the anode of the diode D6 and the cathode of the phase D winding; a hall current sensor L1 for measuring a-phase and C-phase currents, and a hall current sensor L2 for measuring a B-phase and D-phase currents; the controllable switch tube is a common MOSFET or IGBT.
Description of the working principle: the converter has five working modes, namely a high-voltage excitation mode, a low-voltage excitation mode, an upper tube zero-voltage follow current mode, a lower tube zero-voltage follow current mode and a negative high-voltage follow current mode. The phase A is specifically shown below. When the phase A is excited at high voltage, the phase A current is rapidly increased by exciting the phase A through opening S7 and S3, as shown in FIG. 2. When the phase A is excited at low voltage, the phase S7 is switched off, and the phase A is excited by switching on the phases S1 and S3, as shown in FIG. 3. When the a-phase current freewheels at zero voltage, the D3 is turned on by turning on S7, and the a-phase current freewheels at zero voltage, as shown in fig. 4. When the a-phase tube freewheels at zero voltage, the D1 is turned on by turning on S3, and the a-phase current freewheels at zero voltage, as shown in fig. 5. When phase a freewheels negatively at high voltage, phase a current quickly takes effect to zero by turning on D1 and D3, as shown in fig. 6.
The detection of the four-phase current can be achieved by two hall current sensors L1 and L2 at the same time. In order to effectively explain the phase current detection process,firstly, when the position of a rotor is positioned between an opening angle and a closing angle, defining the rotor as a conducting interval; when the rotor position is outside the on-interval and the phase current is not zero, it is defined as the off-interval. The current detection process is divided into two conditions, the first one is a single-phase working mode, and only one phase has current at the same time; the second is a two-phase mode of operation, with two phases having current at the same time. When the single-phase working mode is adopted, taking the phase A as an example, when the rotor position is positioned in the phase A conduction interval and the phase A shutdown interval, the phase A current (i)a) Only L1 is passed through in high-voltage excitation mode, low-voltage excitation mode, upper zero voltage freewheel mode, lower zero voltage freewheel mode and negative high-voltage freewheel mode, and the specific value is as shown in formula (1).
ia＝iL1 (1)
In formula (1) iL1Is the measurement value of the hall current sensor L1.
In the two-phase operation mode, the phase A current (i) is switched on when the phase A and the phase B are the samea) The phase B current (i) passes through only L1 in the high-voltage excitation mode, the low-voltage excitation mode, the upper zero-voltage follow current mode, the lower zero-voltage follow current mode and the negative high-voltage follow current modeb) L2 only is passed in all of the high voltage excitation mode, the low voltage excitation mode, the upper zero voltage freewheel mode, the lower zero voltage freewheel mode, and the negative high voltage freewheel mode, so iaAnd ibThe specific value is shown in formula (2).
The provided control strategy comprises a rotating speed control loop, a current control loop and a capacitance voltage control loop, wherein the current control loop and the voltage control loop are controlled by hysteresis loops, reference current is output by rotating speed control, and the reference current and current of each phase measured by two current sensors are input into a current hysteresis controller to output driving signals of each phase; high-level signals of driving signals of all phases select high-voltage excitation and low-voltage excitation through the output of a voltage ring, the high-voltage excitation mode is used for reducing voltage, the voltage of a capacitor is prevented from being overhigh, the low-voltage excitation can ensure that the voltage of the capacitor is unchanged, and the rapid demagnetization is realized; the capacitor is charged by demagnetized energy, so that pumping of voltage is realized; when each phase of driving signals are at a low level, the three-dimensional thermal circuit model or the actually measured temperature of each power device is used for determining the upper zero voltage follow current mode or the lower zero voltage follow current mode, if the temperature of S7 is greater than S3 and S4, the upper zero voltage follow current mode is selected, and if not, the lower zero voltage follow current mode is selected, so that the reliability of the system is improved.
The converter can improve the fault-tolerant capability of the system, and the power converter has two working modes of high-voltage excitation and low-voltage excitation, so that the normal operation of each phase winding when the controllable switching tubes S1, S2, S7 or S8 are open-circuited can be ensured through the mutual conversion of the low-voltage excitation and the high-voltage excitation, and the fault-tolerant capability of the system is improved. For example, when S1 is open, S7 may be turned on to ensure normal excitation of phase a in order to ensure excitation of phase a.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (4)
1. A low-cost self-boosting power converter for a switched reluctance motor and a control strategy thereof are characterized in that: the low-cost self-boosting power converter consists of a direct-current power supply unit, an energy storage capacitor, 8 controllable switching tubes, 6 diodes and 2 Hall current sensors; the direct-current power supply unit can be connected with a storage battery or a switching power supply; the cathode of the energy storage capacitor is connected with the anode of a direct current power supply and the drains of controllable switch tubes S1 and S2, the source of S1 is connected with the cathode of a diode D1 and the source of S7 and the anodes of A-phase and C-phase windings, the source of S2 is connected with the cathode of a diode D2 and the source of S8 and the anodes of B-phase and D-phase windings, the anode of the energy storage capacitor is connected with the cathodes of diodes D3, D4, D5 and D6 and the drains of controllable switch tubes S7 and S8, the cathode of the power supply is connected with the anode of a diode D1 and the anode of D2, the source of the controllable switch tube S3 and the source of S4, the source of S5 and the source of S6, the drain electrode of the controllable switch tube S3 is connected with the anode of the diode D3 and the cathode of the A-phase winding, the drain electrode of the controllable switch tube S4 is connected with the anode of the diode D4 and the cathode of the C-phase winding, the drain electrode of the controllable switch tube S5 is connected with the anode of the diode D5 and the cathode of the phase B winding, and the drain electrode of the controllable switch tube S6 is connected with the anode of the diode D6 and the cathode of the phase D winding; a hall current sensor L1 for measuring a-phase and C-phase currents, and a hall current sensor L2 for measuring a B-phase and D-phase currents; the controllable switch tube is a common MOSFET or IGBT.
2. The converter has five working modes, namely a high-voltage excitation mode, a low-voltage excitation mode, an upper tube zero-voltage follow current mode, a lower tube zero-voltage follow current mode and a negative high-voltage follow current mode, can realize real-time monitoring of four-phase current through the two Hall current sensors, and effectively reduces the using number of the current sensors.
3. The provided control strategy comprises a rotating speed control loop, a current control loop and a capacitance voltage control loop, wherein the current control loop and the voltage control loop are controlled by hysteresis loops, reference current is output by rotating speed control, and the reference current and current of each phase measured by two current sensors are input into a current hysteresis controller to output driving signals of each phase; high-level signals of driving signals of all phases select high-voltage excitation and low-voltage excitation through the output of a voltage ring, the high-voltage excitation mode is used for reducing voltage, the voltage of a capacitor is prevented from being overhigh, the low-voltage excitation can ensure that the voltage of the capacitor is unchanged, and the rapid demagnetization is realized; the capacitor is charged by demagnetized energy, so that pumping of voltage is realized; when each phase of driving signals are at a low level, the three-dimensional thermal circuit model or the actually measured temperature of each power device is used for determining the upper zero voltage follow current mode or the lower zero voltage follow current mode, if the temperature of S7 is greater than S3 and S4, the upper zero voltage follow current mode is selected, and if not, the lower zero voltage follow current mode is selected, so that the reliability of the system is improved.
4. The converter can improve the fault-tolerant capability of the system, and the power converter has two working modes of high-voltage excitation and low-voltage excitation, so that the normal operation of each phase winding when the controllable switching tubes S1, S2, S7 or S8 are open-circuited can be ensured through the mutual conversion of the low-voltage excitation and the high-voltage excitation, and the fault-tolerant capability of the system is improved.
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Citations (5)
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|---|---|---|---|---|
| CN103475292A (en) * | 2013-08-13 | 2013-12-25 | 燕山大学 | Switch magnetic resistance generator system capable of realizing rapid excitation/demagnetization |
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| US20170310271A1 (en) * | 2014-09-24 | 2017-10-26 | Robert Bosch Gmbh | Method for operating a circuit assembly |
| CN107547019A (en) * | 2017-10-30 | 2018-01-05 | 中国矿业大学 | A kind of active booster converter of switch reluctance generator and its control method |
| CN108400573A (en) * | 2017-05-22 | 2018-08-14 | 徐州海纳驱动技术有限公司 | Continued flow tube guard method under a kind of switch reluctance machine drive low speed chopping mode |
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2021
- 2021-10-12 CN CN202111188192.XA patent/CN114465548A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103475292A (en) * | 2013-08-13 | 2013-12-25 | 燕山大学 | Switch magnetic resistance generator system capable of realizing rapid excitation/demagnetization |
| US20170310271A1 (en) * | 2014-09-24 | 2017-10-26 | Robert Bosch Gmbh | Method for operating a circuit assembly |
| CN106707167A (en) * | 2017-01-16 | 2017-05-24 | 浙江大学 | Low-cost detection system and method of winding current of switching reluctance motor |
| CN108400573A (en) * | 2017-05-22 | 2018-08-14 | 徐州海纳驱动技术有限公司 | Continued flow tube guard method under a kind of switch reluctance machine drive low speed chopping mode |
| CN107547019A (en) * | 2017-10-30 | 2018-01-05 | 中国矿业大学 | A kind of active booster converter of switch reluctance generator and its control method |
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| DONG-HEE LEE ET AL.: "An Advanced Multi-Level Converter for Four-Phase SRM Drive", 2008 IEEE POWER ELECTRONICS SPECIALISTS CONFERENCE * |
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Application publication date: 20220510 |