CN116979857A - PWM-DITC control method for switched reluctance motor based on novel multi-level power converter - Google Patents

PWM-DITC control method for switched reluctance motor based on novel multi-level power converter Download PDF

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CN116979857A
CN116979857A CN202310797282.1A CN202310797282A CN116979857A CN 116979857 A CN116979857 A CN 116979857A CN 202310797282 A CN202310797282 A CN 202310797282A CN 116979857 A CN116979857 A CN 116979857A
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phase
torque
state
voltage
ditc
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蔡燕
刘慧�
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Tianjin Polytechnic University
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Tianjin Polytechnic University
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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
    • 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
    • H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
    • H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
    • H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
    • H02P27/08—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Electric Motors In General (AREA)

Abstract

The invention discloses a PWM-DITC control method of a switched reluctance motor based on a novel multi-level power converter, belongs to the technical field of switched reluctance motors, and is used for solving the problem of larger torque pulsation caused by bus voltage limitation and constant voltage level between hysteresis limits in the traditional Direct Instantaneous Torque Control (DITC). The high-voltage rapid excitation and rapid demagnetization functions of the novel multi-level power converter are utilized, the commutation area is redefined, the conduction area is divided into the commutation area and the single-phase conduction area by taking the turn-off angle as a limit, the proposed PWM-DITC control method is adopted in the commutation area, different control methods are respectively formulated for the latest on phase and the about-to-turn-off phase of the commutation area, the hysteresis DITC control method under large torque deviation and the PWM equivalent method under small torque deviation are realized, the optimized control method provides proper phase voltage for the winding under fixed frequency, and the torque pulsation of the switch reluctance motor is effectively restrained.

Description

PWM-DITC control method for switched reluctance motor based on novel multi-level power converter
Technical Field
The invention relates to the technical field of motor control, in particular to a PWM-DITC control method of a switched reluctance motor based on a novel multi-level power converter.
Background
The switched reluctance motor (Switched Reluctance Motor, SRM) has been widely used in the fields of electric automobiles, aviation, mine transportation, etc. because of its simple structure, low cost, large starting torque, flexible control mode, good adaptability to severe working environments, etc. However, due to the doubly salient structure of the reluctance motor, its output torque is a nonlinear function of stator current and rotor position, increasing torque ripple, limiting the development of SRM. Therefore, how to suppress torque ripple of the SRM becomes a core problem to be solved by each learner.
The scholars at home and abroad aim at the problem of large torque pulsation of the switch reluctance motor, and a great deal of researches are made on the design, driving topology and control method of the motor body. In the prior art, a control method for effectively suppressing torque pulsation is to take instantaneous torque as a control object and adjust the conduction condition of a power device according to the deviation of the torque. The instantaneous torque control may be classified into Indirect Instantaneous Torque Control (IITC) and Direct Instantaneous Torque Control (DITC) according to the control method. The IITC mainly acquires accurate reference current according to the reference signal, the three-phase current is controlled to follow the reference current through the current controller, the DITC directly takes the instantaneous torque as a controlled object, generates a switching signal according to the error between the reference torque and the instantaneous output torque, does not need to accurately control the current waveform, and simplifies the structure of a control system and the implementation difficulty of a control algorithm. Currently, hysteresis type DITC is commonly used, which always maintains the same voltage level between hysteresis limits and cannot provide proper phase voltage to windings.
As the speed of the switched reluctance motor increases, its back emf increases, shortening its excitation and demagnetization times, and is limited by the asymmetric half-bridge power converter bus voltage, making it difficult for the SRM to establish the desired phase current, resulting in reduced current and torque, and the total torque cannot follow the desired torque regulation within the hysteresis. The invention patent of China (patent number CN 201711257094.0) discloses a novel SRM multi-level power converter, which can realize rapid excitation and rapid demagnetization of windings, and each phase of bridge arm can be independently switched under four level states, and a control method can be flexibly formulated. The invention aims to provide a PWM-DITC control method based on the multi-level power converter, which can effectively inhibit torque pulsation of SRM.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a PWM-DITC control method of a switched reluctance motor based on a novel multi-level power converter aiming at the defects of the prior art. The invention aims to overcome the busbar voltage limit of an asymmetric half-bridge power converter by utilizing the advantages of high-voltage rapid excitation and high-voltage rapid demagnetization of a novel multi-level power converter, and provides a control method of PWM-DITC (pulse width modulation-direct current) with switchable voltage levels between hysteresis limits, so as to inhibit torque pulsation of SRM.
A switched reluctance motor PWM-DITC control system based on a novel multilevel power converter, the system comprising: speed PI controller (1), torque calculation unit (2), boost capacitor voltage controller (3), PWM-DITC torque controller (4), switching table (5), novel multi-level power converter (6), switched reluctance motor (7), current sensor (8), position sensor (9), voltage sensor (10), rotational speed calculation unit (11), wherein:
the current sensor (8) is used for detecting the current value i of the motor winding K ；
The position sensor (9) is used for detecting the rotor position theta of the motor and providing the rotor position theta to other modules;
the voltage sensor (10) is used for detecting the voltage U of the boost capacitor C2 in the novel multi-level power converter (6) C2 ；
The rotating speed calculating unit (11) is used for calculating the actual rotating speed of the motor;
the speed PI controller (1) generates a reference torque according to the deviation between the reference rotating speed and the actual rotating speed;
the torque calculation unit (2) receives the current values of windings of each phase detected by the current sensor and the position of a motor rotor detected by the position sensor, and obtains the actual output torque of the motor through a table lookup method;
the boost capacitor voltage controller (3) receives the voltage U detected by the voltage sensor C2 And calculates an average voltage V by an average voltage calculating unit av V is set up av And the reference voltage V of the boost capacitor C2 ref The deviation of (a) is passed through a PI regulator to obtain a boost capacitor voltage control angle theta h ；
The PWM-DITC torque controller (4) is the core of the control system and is used for controlling the torque according to the opening angle theta on Angle of turn-off theta off Torque deviation Δt, current acquired rotor position θ and riseVoltage control angle theta of piezocapacitor h The PWM-DITC torque controller outputs the working state of the motor at the next moment, wherein the calculation formula of the torque deviation is as follows:
ΔT＝T ref -T est
wherein T is ref For reference torque, T est For outputting torque instantaneously, the switching table (5) converts the next working state of the motor into the switching state of the novel multi-level power converter (6); and controlling the on-off of the bridge arm switching tubes of each phase of the power converter according to the switching state, and realizing direct instantaneous torque control of the switched reluctance motor (7) by applying different voltages to the phase windings.
A novel multi-level power converter-based PWM-DITC control method for a switched reluctance motor comprises the following steps:
step 1, performing finite element simulation according to a method of experimental measurement or according to design parameters of a switched reluctance motor body to obtain electromagnetic characteristic data of SRM, and forming a lookup table of torque, angle and current by a modeling method;
step 2, taking a three-phase switch reluctance motor as an example, dividing a region between two adjacent opening angles, namely one third of an electric period, into a phase change region and a single-phase conduction region by taking a closing angle as a limit, taking A, B phase change as an example, wherein the phase change region is from a B-phase opening angle to an A-phase related opening angle, and the single-phase conduction region is from an A-phase related opening angle to a C-phase opening angle;
step 3, the novel multi-level power converter has four working states, each phase bridge arm can respectively realize high-voltage excitation, normal-voltage excitation, follow current and high-voltage demagnetization states, and taking an A phase bridge arm as an example, the four level states respectively correspond to +2 ', "+1'," -0 ', and "-2'; when the switch tube S A1 、S A2 、S A3 All are on, and the phase A works in a +2 state and is marked as stateA= +2; when the switch tube S A2 、S A3 Open, S A1 When the phase A is turned off, the phase A works in a +1 state and is marked as stateA= +1; when S is A1 、S A2 When turned off, S A3 On, phase a works in the "0" state, noted statea=0; when the switch tube S A1 、S A2 、S A3 When all the phase A is turned off and current exists in the winding, the phase A works in a state of minus 2, namely stateA= -2, and the working states of other phase bridge arms are analogized;
step 4, the latest open phase and the about-to-close phase of the commutation area have different working requirements, different control methods are designed for the latest open phase and the about-to-close phase, and A, B commutation is taken as an example, and the switching-on rules and methods are as follows: 1) Sampling the torque deviation deltat while maintaining the sampled torque deviation for a period Ts, the sampled torque deviation being noted deltat 1 The method comprises the steps of carrying out a first treatment on the surface of the 2) Will DeltaT 1 Comparing with hysteresis width, if DeltaT 1 In hysteresis, PWM equivalent method is adopted, if DeltaT 1 Outside hysteresis, a hysteresis DITC method is adopted; 3) Will DeltaT 1 Delta T compared to triangular carrier intersection 1 Outputting a high state if the power is larger than the triangular carrier wave, otherwise outputting a low state; the application to the commutation area is specifically:
step 4.1, immediately before phase interruption in the commutation region, when the sampled torque error DeltaT 1 Greater than T L The output torque capacity of the phase to be closed is insufficient, the system needs torque to be increased, the output is in a +1 state, and the excitation state is entered to meet the system requirement; when DeltaT 1 Less than-T H It is known that the output torque is too large, demagnetized as much as possible, and a state of "-2" is output; when DeltaT 1 ∈(0，T L ) When the output torque is insufficient, the output torque is increased by adopting a mode of switching between a +1 state and a +0 state, and the required torque is provided; when DeltaT 1 Greater than the triangular carrier, the winding applies a "+1" state when ΔT 1 When the voltage is smaller than the triangular carrier wave, the winding is in a 0 state; when DeltaT 1 ∈(-T H 0), it is known that the output torque is slightly exceeded, the torque is reduced by switching between the "0" state and the "-2" state, and the output torque is reduced by Δt 1 When the voltage is greater than the triangular carrier wave, zero voltage is applied to the winding, and when delta T is calculated 1 When the voltage is smaller than the triangular carrier wave, the winding is in a '-2' state, and the voltage is rapidly discharged, so that the output of the torque is rapidly reduced;
step 4.2, at the latest open phase of the commutation zone, sampling the torque error DeltaT 1 Greater than 0, it can be seen thatThe output torque capacity should be increased, outputting a "+n" state, such that the output torque is increased; when DeltaT 1 Less than-T L It is known that the output torque is too large, the system should reduce the output of the torque, and the winding works in a 0 state; when DeltaT 1 ∈(-T L When in 0), the torque is increased as well, and the state is switched between an excitation state and a 0 state, so that the current is quickly established; wherein "+n" represents a "+2" state or a "+1" state, the state logic of which depends on the control angle θ h Is located at the location of (c). θ h Should be at [ theta ] on_b ，θ on_c ]Between when phase B is at [ theta ] on_b ，θ h ]When "+n" is a "+2" state; phase B is at [ theta ] h ，θ on_c ]When "+n" is in the "+1" state, i.e.:
step 4.3, the single-phase conduction region is independently provided with the required torque by the B phase, and the required torque passes through the B phase hysteresis threshold-T L And T L The inner hysteresis loop is formed to adjust torque error, and the demagnetizing state is set at hysteresis loop threshold value-T H and-T L An external hysteresis ring is formed.
Compared with the prior art, the invention has the following beneficial effects: the novel multi-level power converter with high-voltage rapid excitation and high-voltage rapid demagnetization functions can accelerate excitation and demagnetization speeds of windings, and can provide proper phase voltage for the windings by combining a PWM-DITC control method, so that torque tracking capacity of the DITC method is improved, and torque pulsation of the SRM is effectively restrained.
Drawings
Fig. 1 is a block diagram of a PWM-DITC control system for a switched reluctance motor based on a novel multi-level power converter according to the present invention.
Fig. 2 is a torque nonlinear model of the SRM of the present invention.
Fig. 3 is a region division method of the novel PWM-DITC control method according to the present invention.
Fig. 4 is a schematic diagram of a novel multilevel power converter according to the present invention.
Fig. 5 is a diagram of four level states of the novel multi-level power converter of the present invention.
FIG. 6 is a schematic diagram of a PWM-DITC control method based on a novel multilevel power converter according to the present invention, and FIG. 6 (a) is a schematic diagram of a control method of an impending phase shutdown of a commutation region; FIG. 6 (b) is a control method of the latest open phase of the commutation area; fig. 6 (c) shows a control method of the single-phase conduction region.
Detailed Description
The invention provides a PWM-DITC control method of a switched reluctance motor based on a novel multi-level power converter, and the invention is further described with reference to the accompanying drawings.
Fig. 1 is a block diagram of a PWM-DITC control system for a switched reluctance motor based on a novel multi-level power converter according to the present invention. Comprising the following steps: the speed PI controller (1), the torque calculation unit (2), the boost capacitor voltage controller (3), the PWM-DITC torque controller (4), the switch meter (5), the novel multi-level power converter (6), the switch reluctance motor (7), the current sensor (8), the position sensor (9), the voltage sensor (10) and the rotating speed calculation unit (11); wherein the current sensor (8) is used for detecting a current value i of the motor winding K The method comprises the steps of carrying out a first treatment on the surface of the The position sensor (9) is used for detecting the rotor position theta of the motor and providing the rotor position theta to other modules; the voltage sensor (10) is used for detecting the voltage U of the boost capacitor C2 in the novel multi-level power converter (6) C2 The method comprises the steps of carrying out a first treatment on the surface of the The rotating speed calculating unit (11) is used for calculating the actual rotating speed of the motor; the speed PI controller (1) generates a reference torque according to the deviation between the reference rotating speed and the actual rotating speed; the torque calculation unit (2) receives the current values of windings of each phase detected by the current sensor and the position of a motor rotor detected by the position sensor, and obtains the actual output torque of the motor through a table lookup method; the boost capacitor voltage controller (3) receives the voltage U detected by the voltage sensor C2 And calculates an average voltage V by an average voltage calculating unit av V is set up av And the reference voltage V of the boost capacitor C2 ref The deviation of (a) is passed through a PI regulator to obtain a boost capacitor voltage control angle theta h The method comprises the steps of carrying out a first treatment on the surface of the The PWM-DITC torque controller (4) is the core of the control system and is used for controlling the torque according to the opening angle theta on Shut offAngle theta off Torque deviation Δt, current acquired rotor position θ, and boost capacitor voltage control angle θ h The PWM-DITC torque controller outputs the working state of the motor at the next moment, wherein the calculation formula of the torque deviation is as follows:
ΔT＝T ref -T est
wherein T is ref For reference torque, T est Is the instantaneous output torque; the switching table (5) converts the next working state of the motor into the switching state of the novel multi-level power converter (6); and controlling the on-off of the bridge arm switching tubes of each phase of the power converter according to the switching state, and realizing direct instantaneous torque control of the switched reluctance motor (7) by applying different voltages to the phase windings.
Fig. 2 is a schematic diagram of a torque nonlinear model of the SRM according to the present invention. And (3) obtaining electromagnetic characteristic data of the SRM by an experimental measurement method or finite element simulation according to design parameters of the switched reluctance motor body, and forming a torque-angle-current lookup table by a modeling method.
Fig. 3 is a region division method of the novel PWM-DITC control method according to the present invention. Taking a three-phase switch reluctance motor as an example, a region between two adjacent opening angles, namely one third of an electric period, is divided into a phase-change region and a single-phase conduction region by taking a closing angle as a limit, and takes A, B phase change as an example, wherein the phase-change region is from a B-phase opening angle to an A-phase related opening angle, and the single-phase conduction region is from an A-phase opening angle to a C-phase opening angle.
Fig. 4 is a schematic diagram of a novel multilevel power converter according to the present invention. The novel multi-level power converter has four working states, each phase bridge arm can respectively realize high-voltage excitation, normal-voltage excitation, follow current and high-voltage demagnetizing states, as shown in the figure5Taking an A-phase bridge arm as an example, the four level states of +2, "+1," +0 and "-2" are respectively corresponding; as shown in FIG. 5 (a), when the switching tube S A1 、S A2 、S A3 All are on, and the phase A works in a +2 state and is marked as stateA= +2; as shown in FIG. 5 (b), when the switching tube S A2 、S A3 Open, S A1 When the phase A is turned off, the phase A works in a +1 state and is marked as stateA= +1; as shown in FIG. 5(c) As shown, when S A1 、S A2 When turned off, S A3 On, phase a works in the "0" state, noted statea=0; as shown in FIG. 5 (d), when the switching tube S A1 、S A2 、S A3 All are turned off, and when current exists in the winding, the A phase works in a state of minus 2, namely the working state of the other phase bridge arms of StateA= -2, and so on.
FIG. 6 shows a PWM-DITC control method based on a novel multi-level power converter according to the present invention, FIG. 6 (a) shows a control method of the commutation area about to be phase-off, when the sampled torque error DeltaT 1 Greater than T L The output torque capacity of the phase to be closed is insufficient, the system needs torque to be increased, the output is in a +1 state, and the excitation state is entered to meet the system requirement; when DeltaT 1 Less than-T H It is known that the output torque is too large, demagnetized as much as possible, and a state of "-2" is output; when DeltaT 1 ∈(0，T L ) When the output torque is insufficient, the required torque is provided by increasing the output torque in a +1 state and a +0 state; when DeltaT 1 Greater than the triangular carrier, the winding applies a "+1" state when ΔT 1 When the voltage is smaller than the triangular carrier wave, the winding is in a 0 state; when DeltaT 1 ∈(-T H 0), it is known that the output torque is slightly exceeded, the torque is reduced by switching between the "0" state and the "-2" state, and the output torque is reduced by Δt 1 When the voltage is greater than the triangular carrier wave, zero voltage is applied to the winding, and when delta T is calculated 1 When the voltage is smaller than the triangular carrier wave, the winding is in a '-2' state, and the voltage is rapidly discharged, so that the output of the torque is rapidly reduced; FIG. 6 (b) is a control method of the latest open phase of the commutation area when the sampled torque error DeltaT 1 Above 0, it is known that the output torque capacity should be increased, outputting a "+n" state, such that the output torque is increased; when DeltaT 1 Less than-T L It is known that the output torque is too large, the system should reduce the output of the torque, and the winding works in a 0 state; when DeltaT 1 ∈(-T L 0), the torque is also increased, the operation is switched between the exciting state and the "0" state, and the current is quickly established, wherein "+n" represents the "+2" state or the "+1" state, and the state logic thereof depends on the control angle theta h Is located at the location of (c). θ h Should be at [ theta ] on_b ，θ on_c ]Between when phase B is at [ theta ] on_b ，θ h ]When "+n" is a "+2" state; phase B is at [ theta ] h ，θ on_c ]When "+n" is in the "+1" state, i.e.:
FIG. 6 (c) single phase conduction region is provided with required torque by phase B alone, through phase B hysteresis threshold-T L And T L The inner hysteresis loop is formed to adjust torque error, and the demagnetizing state is set at hysteresis loop threshold value-T H and-T L An external hysteresis ring is formed.
The above-mentioned embodiments are only preferred embodiments of the present invention, and the present invention is not limited thereto, and any modifications made to the above embodiments according to the technical principles of the present invention are still within the scope of the technical solutions of the present invention.

Claims (3)

1. A switched reluctance motor PWM-DITC control system based on a novel multilevel power converter, the system comprising: the speed PI controller (1), the torque calculation unit (2), the boost capacitor voltage controller (3), the PWM-DITC torque controller (4), the switch meter (5), the novel multi-level power converter (6), the switch reluctance motor (7), the current sensor (8), the position sensor (9), the voltage sensor (10) and the rotating speed calculation unit (11);
the current sensor (8) is used for detecting the current value i of the motor winding K ；
The position sensor (9) is used for detecting the rotor position theta of the motor and providing the rotor position theta to other modules;
the voltage sensor (10) is used for detecting the voltage U of the boost capacitor C2 in the novel multi-level power converter (6) C2 ；
The rotating speed calculating unit (11) is used for calculating the actual rotating speed of the motor;
the speed PI controller (1) generates a reference torque according to the deviation between the reference rotating speed and the actual rotating speed;
the torque calculation unit (2) receives the current values of windings of each phase detected by the current sensor and the position of a motor rotor detected by the position sensor, and obtains the actual output torque of the motor through a table lookup method;
the boost capacitor voltage controller (3) receives the voltage U detected by the voltage sensor C2 And calculates an average voltage V by an average voltage calculating unit av V is set up av And the reference voltage V of the boost capacitor C2 ref The deviation of (a) is passed through a PI regulator to obtain a boost capacitor voltage control angle theta h ；
The PWM-DITC torque controller (4) is the core of the control system and is used for controlling the torque according to the opening angle theta on Angle of turn-off theta off Torque deviation Δt, current acquired rotor position θ, and boost capacitor voltage control angle θ h The PWM-DITC torque controller outputs the working state of the motor at the next moment, wherein the calculation formula of the torque deviation is as follows:
ΔT＝T ref -T est
wherein T is ref For reference torque, T est Is the instantaneous output torque; the switching table (5) converts the next working state of the motor into the switching state of the novel multi-level power converter (6); and controlling the on-off of the bridge arm switching tubes of each phase of the power converter according to the switching state, and realizing direct instantaneous torque control of the switched reluctance motor (7) by applying different voltages to the phase windings.
2. The novel multi-level power converter-based PWM-DITC control method for the switched reluctance motor is characterized by comprising the following steps of:
step 1, performing finite element simulation according to a method of experimental measurement or according to design parameters of a switched reluctance motor body to obtain electromagnetic characteristic data of SRM, and forming a lookup table of torque, angle and current by a modeling method;
step 2, taking a three-phase switch reluctance motor as an example, dividing a region between two adjacent opening angles, namely one third of an electric period, into a phase change region and a single-phase conduction region by taking a closing angle as a limit, taking A, B phase change as an example, wherein the phase change region is from a B-phase opening angle to an A-phase related opening angle, and the single-phase conduction region is from an A-phase related opening angle to a C-phase opening angle;
step 3, the novel multi-level power converter has four working states, each phase bridge arm can respectively realize high-voltage excitation, normal-voltage excitation, follow current and high-voltage demagnetization states, and taking an A phase bridge arm as an example, the four level states respectively correspond to +2 ', "+1'," -0 ', and "-2'; when the switch tube S A1 、S A2 、S A3 All are on, and the phase A works in a +2 state and is marked as stateA= +2; when the switch tube S A2 、S A3 Open, S A1 When the phase A is turned off, the phase A works in a +1 state and is marked as stateA= +1; when S is A1 、S A2 When turned off, S A3 On, phase a works in the "0" state, noted statea=0; when the switch tube S A1 、S A2 、S A3 When all the phase A is turned off and current exists in the winding, the phase A works in a state of minus 2, namely stateA= -2, and the working states of other phase bridge arms are analogized;
step 4, the latest open phase and the about-to-close phase of the commutation area have different working requirements, different control methods are designed for the latest open phase and the about-to-close phase, and A, B commutation is taken as an example, and the switching-on rules and methods are as follows: 1) Sampling the torque deviation deltat while maintaining the sampled torque deviation for a period Ts, the sampled torque deviation being noted deltat 1 The method comprises the steps of carrying out a first treatment on the surface of the 2) Will DeltaT 1 Comparing with hysteresis width, if DeltaT 1 In hysteresis, PWM equivalent method is adopted, if DeltaT 1 Outside hysteresis, a hysteresis DITC control method is adopted; 3) Will DeltaT 1 Delta T compared to triangular carrier intersection 1 And if the output signal is larger than the triangular carrier wave, outputting a high state, otherwise, outputting a low state.
3. The method for controlling the PWM-DITC of a switched reluctance motor based on a novel multilevel power converter according to claim 2, wherein step 4 is to design a suitable control method according to different working requirements of a latest on phase and an about-to-be-off phase, specifically:
step 4.1, immediately closing the phase in the phase change region, samplingPost torque error delta T 1 Greater than T L The output torque capacity of the phase to be closed is insufficient, the system needs torque to be increased, the output is in a +1 state, and the excitation state is entered to meet the system requirement; when DeltaT 1 Less than-T H It is known that the output torque is too large, demagnetized as much as possible, and a state of "-2" is output; when DeltaT 1 ∈(0，T L ) When the output torque is insufficient, switching is performed by adopting a +1 state and a +0 state, and the required torque is provided; when DeltaT 1 Above the triangular carrier, the winding applies a "+1" state when Δt 1 When the voltage is smaller than the triangular carrier wave, the winding is in a 0 state; when DeltaT 1 ∈(-T H 0), it is known that the output torque is slightly exceeded, the torque is reduced by switching between the "0" state and the "-2" state, and the output torque is reduced by Δt 1 When the voltage is greater than the triangular carrier wave, zero voltage is applied to the winding, and when delta T is calculated 1 When the voltage is smaller than the triangular carrier wave, the winding is in a '-2' state and rapidly discharges so as to rapidly reduce the output torque;
step 4.2, at the latest open phase of the commutation zone, sampling the torque error DeltaT 1 Above 0, it is known that the output torque capacity should be increased, outputting a "+n" state, such that the output torque is increased; when DeltaT 1 Less than-T L It is known that the output torque is too large, the system should reduce the output of the torque, and the winding works in a 0 state; when DeltaT 1 ∈(-T L 0), the torque is also increased, the operation is switched between the exciting state and the "0" state, and the current is quickly established, wherein "+n" represents the "+2" state or the "+1" state, and the state logic thereof depends on the control angle theta h Is located at the location of (c). θ h Should be at [ theta ] on_b ，θ on_c ]Between when phase B is at [ theta ] on_b ，θ h ]When "+n" is a "+2" state; phase B is at [ theta ] h ，θ on_c ]When "+n" is in the "+1" state, i.e.:
step 4.3, single phaseThe conduction region is independently provided with required torque by the phase B, and the required torque passes through the phase B hysteresis threshold value-T L And T L The inner hysteresis loop is formed to adjust torque error, and the demagnetizing state is set at hysteresis loop threshold value-T H and-T L An external hysteresis ring is formed.
CN202310797282.1A 2023-07-03 2023-07-03 PWM-DITC control method for switched reluctance motor based on novel multi-level power converter Pending CN116979857A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117277908A (en) * 2023-11-21 2023-12-22 佳沃德（佛山）科技有限公司 Power converter of high-speed switch reluctance motor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117277908A (en) * 2023-11-21 2023-12-22 佳沃德（佛山）科技有限公司 Power converter of high-speed switch reluctance motor

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