CN110247597B - Excitation-circuit doubly salient motor field loss fault-tolerant power generation system and control method thereof - Google Patents
Excitation-circuit doubly salient motor field loss fault-tolerant power generation system and control method thereof Download PDFInfo
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- 238000010248 power generation Methods 0.000 title claims abstract description 67
- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000004804 winding Methods 0.000 claims description 138
- 230000005284 excitation Effects 0.000 claims description 73
- 239000003990 capacitor Substances 0.000 claims description 28
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- 238000010586 diagram Methods 0.000 description 6
- 238000004146 energy storage Methods 0.000 description 4
- 238000011217 control strategy Methods 0.000 description 2
- 230000005347 demagnetization Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
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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
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
- H02P9/10—Control effected upon generator excitation circuit to reduce harmful effects of overloads or transients, e.g. sudden application of load, sudden removal of load, sudden change of load
- H02P9/105—Control effected upon generator excitation circuit to reduce harmful effects of overloads or transients, e.g. sudden application of load, sudden removal of load, sudden change of load for increasing the stability
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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
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
- H02P9/44—Control of frequency and voltage in predetermined relation, e.g. constant ratio
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Abstract
The invention discloses a field failure fault-tolerant power generation system of an electro-magnetic doubly salient motor and a control method thereof. The method realizes fault-tolerant power generation after the double-salient-pole electro-magnetic motor has a loss-of-magnetization fault, improves the fault capacity of the system, and is suitable for the fields of aerospace and the like with higher requirements on reliability.
Description
Technical Field
The invention belongs to the technical field of motor control, and particularly relates to a field-effect doubly salient excitation motor field-loss fault-tolerant power generation system and a control method thereof.
Background
The electrically excited double salient pole motor is one new type of brushless DC motor developed based on switched reluctance motor, and has armature winding wound on the stator and no winding on the rotor, simple and reliable structure and flexible control. The double-salient electro-magnetic motor is mainly different from a switched reluctance motor in that an excitation winding is embedded on a stator, and the double-salient electro-magnetic motor only needs to be externally connected with an uncontrolled rectifier bridge to generate electricity when the double-salient electro-magnetic motor generates electricity due to the existence of an excitation magnetic field, so that the double-salient electro-magnetic motor has the advantages of good fault tolerance and suitability for severe working conditions, can maintain constant output voltage by adjusting the magnitude of excitation current when the load or the rotating speed changes, is very flexible to control, and has wide application prospects in the fields of aviation, wind power generation and the.
The presence of the field winding on the one hand increases the flexibility of the system control, but on the other hand also brings safety and reliability problems. The aging, the wetting, the heating, the erosion and the like of the excitation winding can all influence the safe operation of the system. In addition, the excitation power circuit for controlling excitation may also be faulty due to overcurrent, reverse voltage impact, etc., and in case of serious conditions, the whole system will lose excitation. If the electrically excited doubly salient generator has a field loss fault in the operation process, the whole system can stop operating.
At present, the research on the fault-tolerant control strategy of the field failure of the doubly salient electro-magnetic motor is less. The prior art comprises an excitation fault-tolerant power generation system of an electro-magnetic doubly salient motor and a control method thereof (China, authorized date: 5 and 17 in 2017, and an authorized number: CN104579067B) disclosed by Shiliwei and the like, wherein redundant bridge arms are added on the basis of a three-phase full bridge to form a three-phase four-bridge arm converter, the three-phase four-bridge arm converter is supplied with positive and negative excitation currents alternately for each phase, so that the fault-tolerant power generation function of the excitation fault of the motor is realized, but the introduced bridge arm switching frequency is three times that of an original common bridge arm; "a four-phase electro-magnetic doubly salient motor field loss fault-tolerant power generation method" (china, published: 2017, 5, month and 22, publication number: CN107147339A) disclosed by zhongxingwei et al provides a new control method by adding a redundant bridge arm in combination with the characteristic that the self-inductance moment of the four-phase motor changes along with the position of a rotor, so that field loss fault-tolerant power generation is realized, but the method enables follow current to follow in an inductance rising area, and the efficiency is reduced. The two control modes can realize the function of loss-of-field fault-tolerant operation, and can control the generated voltage by controlling the excitation angle, but the added bridge arm needs to flow two-phase current at the same time, and the requirement on devices is higher. Meanwhile, the excitation fault-tolerant power generation system of the electro-magnetic doubly salient motor and the control method thereof (China, published: 6 and 5 in 2018, and published: CN108123646A) disclosed by the Wenchun Xiang and the like also provide a function of generating power by using a three-phase full-bridge converter directly and providing positive and negative alternate current for each phase by controlling a switching tube of the power converter so as to realize loss-of-excitation fault, and the method does not need to add a new bridge arm, has a simple main power circuit structure and lower cost, but has the advantages of more complex control strategy, longer excitation area, complex excitation process, series connection of a power generation phase of the motor and another phase, smaller power generation angle and lower power generation efficiency. In addition, the electromagnetic double-salient motor field failure fault-tolerant power generation system and the control method thereof disclosed by Wangkong (281569) and the like (China, published: 3 and 8 in 2019, and publication number: CN109450340A) also provide an H-bridge converter, the method independently opens three-phase windings through 12 switching tubes, each phase is independently excited and generated, the efficiency is higher, but the number of the tubes is large, and the system is not suitable for the field with limited cost and volume.
Disclosure of Invention
The purpose of the invention is as follows: aiming at the problems of low efficiency, complex control method, high manufacturing cost and the like in the prior art, the invention provides a demagnetization fault-tolerant power generation system of an electro-magnetic doubly salient motor and a control method thereof.
The technical scheme is as follows: the invention provides a fault-tolerant power generation system for a field excitation doubly salient motor field failure, which comprises: the device comprises a direct-current power supply, an eleventh diode, a full-bridge converter, an electrically excited doubly salient motor, a controller, an asymmetric half-bridge converter, a position sensor, a first split capacitor, a second split capacitor, a load resistor and a switch;
the full-bridge converter comprises a first bridge arm, a second bridge arm and a third bridge arm which are connected in parallel; the anode of the direct current power supply is connected with the anode of an eleventh diode, the cathode of the direct current power supply is connected with the cathode of the first bridge arm, and the cathode of the eleventh diode is connected with the anode of the first bridge arm; the negative electrode of the first split capacitor is connected with the positive electrode of the second split capacitor to form a fourth bridge arm, and the connection position is the midpoint of the fourth bridge arm; the fourth bridge arm is connected with the third bridge arm in parallel; the load resistor is connected with the fourth bridge arm in parallel, and the voltage of the load resistor end is output voltage; the electro-magnetic doubly salient motor comprises an A-phase winding, a B-phase winding, a C-phase winding and an excitation winding, wherein one ends of the A-phase winding, the B-phase winding and the C-phase winding are sequentially connected with the middle points of a first bridge arm, a second bridge arm and a third bridge arm of the full-bridge converter, the other ends of the A-phase winding, the B-phase winding and the C-phase winding are mutually connected to form a neutral point, and the neutral point is connected with the middle point of a fourth bridge arm through a switch; the excitation winding is connected with the asymmetric half-bridge converter in parallel, and the controller acquires excitation current information of the excitation winding, current information of A-phase, B-phase and C-phase windings, output voltage information and rotor position information of the electrically-excited doubly-salient motor; and processing the acquired information to generate a driving signal for driving the full-bridge converter.
The full-bridge converter comprises a first switch tube, a second switch tube, a third switch tube, a fourth switch tube, a fifth switch tube, a sixth diode, a seventh diode, a sixth diode, a seventh; the negative electrode of the third switching tube is connected with the positive electrode of the sixth switching tube to form a second bridge arm, and the connection position is the midpoint of the second bridge arm; and the negative electrode of the fifth switching tube is connected with the positive electrode of the second switching tube to form a third bridge arm, and the connection position is the midpoint of the third bridge arm.
Furthermore, the controller comprises a voltage and current detection conditioning circuit, a DSP (digital signal processor), a CPLD (complex programmable logic device) logic comprehensive circuit, a driving circuit and a position sensor, wherein the voltage and current detection conditioning circuit acquires excitation current information of an excitation winding, current information and output voltage information of a phase A winding, a phase B winding and a phase C winding and transmits the acquired information to the DSP and CPLD logic comprehensive circuit; the position sensor is arranged in the electro-magnetic doubly salient motor and used for acquiring the position of a rotor of the electro-magnetic doubly salient motor and transmitting the position information to the DSP and CPLD logic comprehensive circuit; the DSP and CPLD logic comprehensive circuit processes the received information to generate a driving signal; and supplies the driving signal to the full-bridge inverter through the driving circuit.
The control method of the excitation double salient pole motor demagnetization fault-tolerant power generation system comprises the following steps:
step 1: the controller detects the exciting current i of the current exciting windingfA value of (a) if ifIf the magnetic field is more than 0, judging that the system is not demagnetized, and turning to the step 2; if ifIf the magnetic field is equal to 0, judging that the system is demagnetized, and turning to the step 3;
step 2, the switch is switched off, and the system generates power in a traditional uncontrolled rectification power generation mode through the first diode to the sixth diode, namely closed-loop control is carried out on the output voltage of the system by adjusting the exciting current; the method specifically comprises the following steps: if the output voltage is lower than the given voltage, the controller increases the exciting current; if the output voltage is higher than the given voltage, the controller reduces the exciting current;
and step 3: and switching to a fault-tolerant operation mode for power generation, closing a switch, generating power by the system in a switched reluctance motor power generation mode, and performing chopping control on the currents of the A-phase winding, the B-phase winding and the C-phase winding so as to realize closed-loop control on output voltage.
Further, the specific method of the system for generating power in a switched reluctance motor power generation mode is as follows: setting the current flowing to a neutral point as a positive current direction, wherein the A-phase winding, the B-phase winding and the C-phase winding are in four states of positive excitation, positive power generation, reverse excitation and reverse power generation, wherein the currents of the A-phase winding, the B-phase winding and the C-phase winding are provided by two parts, one part is provided for the current power generation phase, and the other part is provided for a split capacitor; setting the on angle of phase A as alpha, the off angle as beta, the beta-alpha is less than 120 degrees;
when the controller detects that the electrical angle of the motor is positioned at (alpha, beta), the first switching tube is conducted, the A-phase winding is in a positive excitation stage, and the C-phase winding is in a negative power generation state;
when the controller detects that the electrical angle of the motor is (alpha +120 degrees, beta +120 degrees), the sixth switching tube is conducted, the B-phase winding is in a negative excitation stage, and the A-phase winding is in a positive power generation state;
when the controller detects that the electrical angle of the motor is (alpha +240 degrees, beta +240 degrees), the fifth switching tube is conducted, the C-phase winding is in a positive excitation stage, and the B-phase winding is in a negative power generation state;
when the controller detects that the electrical angle of the motor is (alpha +360 degrees, beta +360 degrees), the fourth switch tube is conducted, the A-phase winding is in a negative excitation stage, and the C-phase winding is in a positive power generation state;
when the controller detects that the electrical angle of the motor is positioned at (alpha +480 degrees, beta +480 degrees), the third switching tube is conducted, the B-phase winding is in a positive excitation stage, and the A-phase winding is in a negative power generation state;
when the controller detects that the electrical angle of the motor is (alpha +600 degrees, 720 degrees) & [0 degrees, beta-120 degrees ], the second switching tube is conducted, the C-phase winding is in a negative excitation stage, the B-phase winding is in a positive power generation state, one part of electric energy generated by the B-phase winding is excited by the C-phase winding through the sixth diode and the second switching tube, one part of the electric energy is supplied to the second split capacitor through the sixth diode, and other electric energy is supplied to the load resistor through the first split capacitor and the sixth diode.
Further, the specific method for realizing closed-loop control of the output voltage by performing chopping control on the currents of the a-phase winding, the B-phase winding and the C-phase winding includes: the controller performs PI regulation on the error between the output voltage and the given voltage to obtain given current, performs PI regulation on the given current and the current of the current excited winding to obtain corresponding duty ratio, and if the output voltage is lower than the given voltage, the controller correspondingly increases the duty ratio of the full-bridge converter according to the obtained corresponding duty ratio; if the output voltage is higher than the given voltage, the controller correspondingly reduces the duty ratio of the full-bridge converter according to the obtained corresponding duty ratio.
Has the advantages that:
(1) the switch tube quantity is few, and the cost is lower.
(2) The phase current loop of the motor power generation does not need to be connected with the excitation phase in series, so that the loss is reduced, and the power generation efficiency can be improved
(3) The split capacitor is adopted, during normal excitation, the split capacitor plays a role in energy storage, during the loss of excitation operation, the two capacitors divide the direct current power supply into a bipolar power supply except for the energy storage role, the excitation task under the loss of excitation fault is completed,
drawings
Fig. 1 is a circuit diagram of the present invention.
Fig. 2 is a self-inductance curve of a three-phase electro-magnetic doubly salient motor.
FIG. 3 is a schematic diagram of fault-tolerant generated current during a loss-of-field fault of the three-phase electro-magnetic doubly salient motor of the invention.
Fig. 4 is a schematic diagram of the a-phase forward excitation loop when the electrical angle is at (α, β).
Fig. 5 is a schematic diagram of a circuit for supplying power to the capacitor C1 by negative C-phase power generation when the electrical angle is (α, β).
Fig. 6 is a schematic diagram of a circuit for supplying power to a load by a C-phase negative power generation series capacitor C2 when the electrical angle is (α, β).
Detailed Description
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention.
The embodiment provides a field failure fault-tolerant power generation system of an electro-magnetic doubly salient motor, which introduces two capacitors on the basis of an original three-phase full-bridge topology to form a split capacitor topology; the specific circuit diagram of the system is shown in fig. 1, and specifically includes: the device comprises a direct-current power supply, an eleventh diode, a full-bridge converter, an electrically excited doubly salient motor, a controller, an asymmetric half-bridge converter, a position sensor, a first split capacitor, a second split capacitor, a load resistor and a switch;
the full-bridge converter comprises a first bridge arm, a second bridge arm and a third bridge arm which are connected in parallel; the anode of the direct current power supply is connected with the anode of an eleventh diode, the cathode of the direct current power supply is connected with the cathode of the first bridge arm, and the cathode of the eleventh diode is connected with the anode of the first bridge arm; the negative electrode of the first split capacitor is connected with the positive electrode of the second split capacitor to form a fourth bridge arm, and the connection position is the midpoint of the fourth bridge arm; the fourth bridge arm is connected with the third bridge arm in parallel; the load resistor is connected with the fourth bridge arm in parallel, and the voltage of the load resistor end is output voltage; the electro-magnetic doubly salient motor comprises an A-phase winding, a B-phase winding, a C-phase winding and an excitation winding, wherein one ends of the A-phase winding, the B-phase winding and the C-phase winding are sequentially connected with the middle points of a first bridge arm, a second bridge arm and a third bridge arm of the full-bridge converter, and the other ends of the A-phase winding, the B-phase winding and the C-phase winding are mutually connected to form a neutral point and are connected with the middle point; the excitation winding is connected with the asymmetric half-bridge converter in parallel, and the controller acquires excitation current information of the excitation winding, current information of A-phase, B-phase and C-phase windings, output voltage information and rotor position information of the electrically-excited doubly-salient motor; and processing the acquired information to generate a driving signal for driving the full-bridge converter. Fig. 3 shows self-inductance curves of the a-phase, B-phase, and C-phase windings.
The direct current voltage UdcThe initial excitation voltage is provided, the generated voltage does not work after being established, and the series diode D11 can prevent the power supply from bearing the overhigh voltage and being reversely broken down after the generated voltage is established.
During normal excitation, the split capacitor plays a role in energy storage, and during the loss-of-field operation, the two capacitors divide the direct-current power supply into a bipolar power supply except for the energy storage function, so that the excitation task under the loss-of-field fault is completed, and the excitation part is driven by the asymmetric half-bridge converter.
The full-bridge converter comprises first to sixth switching tubes and first to sixth diodes, the first to sixth switching tubes are connected with the first to sixth diodes in a reverse parallel mode in sequence, the negative electrode of the first switching tube is connected with the positive electrode of the fourth switching tube to form a first bridge arm, the connection position is the middle point of the first bridge arm, the positive electrode of the first switching tube is the positive electrode of the first bridge arm, and the negative electrode of the fourth switching tube is the negative electrode of the first bridge arm; the negative electrode of the third switching tube is connected with the positive electrode of the sixth switching tube to form a second bridge arm, and the connection position is the midpoint of the second bridge arm; and the negative electrode of the fifth switching tube is connected with the positive electrode of the second switching tube to form a third bridge arm, and the connection position is the midpoint of the third bridge arm.
The controller comprises a voltage and current detection conditioning circuit, a DSP (digital signal processor), a CPLD (complex programmable logic device) logic comprehensive circuit, a driving circuit and a position sensor, wherein the voltage and current detection conditioning circuit acquires excitation current information of an excitation winding, current information and output voltage information of A-phase, B-phase and C-phase windings and transmits the acquired information to the DSP and CPLD logic comprehensive circuit; the position sensor is arranged in the electro-magnetic doubly salient motor and used for acquiring the position of a rotor of the electro-magnetic doubly salient motor and transmitting the position information to the DSP and CPLD logic comprehensive circuit; the DSP and CPLD logic comprehensive circuit processes the received information to generate a driving signal; and supplies the driving signal to the full-bridge inverter through the driving circuit.
The invention provides a control method of a field excitation doubly salient motor field loss fault-tolerant power generation system, which comprises the following steps that a controller collects field current information of a field winding, current information of A-phase, B-phase and C-phase windings, output voltage information and rotor position information of an electro-magnetic doubly salient motor; and judging whether the system is demagnetized or not according to the excitation current information, and processing the current information of the A-phase winding, the B-phase winding and the C-phase winding according to the rotor position information and the output voltage of the motor to generate a driving signal controller for driving the full-bridge converter. The method specifically comprises the following steps:
step 1: the controller detects the exciting current i of the current exciting windingfAccording to ifJudging whether the fault-tolerant power generation system is demagnetized or not; if ifIf the magnetic field is more than 0, judging that the system is not demagnetized, and turning to the step 2; if ifIf the magnetic field is equal to 0, judging that the system is demagnetized, and turning to the step 3;
step 2, the switch is switched off, and the system generates power in a traditional uncontrolled rectification power generation mode through the first diode to the sixth diode, namely closed-loop control is carried out on output voltage through adjusting the magnitude of exciting current; the method specifically comprises the following steps: if the output voltage is lower than the given voltage, the controller increases the exciting current; if the output voltage is higher than the given voltage, the controller reduces the exciting current, so that the stable control of the voltage is realized;
and step 3: and switching to a fault-tolerant operation mode for power generation, closing a switch, generating power by the system in a switched reluctance motor power generation mode, and performing chopping control on the currents of the A-phase winding, the B-phase winding and the C-phase winding so as to realize closed-loop control on the output voltage of the system.
The specific method for generating power by the system in a switched reluctance motor power generation mode comprises the following steps: setting the current flowing to a neutral point as a positive current direction, wherein the A-phase winding, the B-phase winding and the C-phase winding are in four states of positive excitation, positive power generation, reverse excitation and reverse power generation, wherein the currents of the A-phase winding, the B-phase winding and the C-phase winding are provided by two parts, one part is provided for the current power generation phase, and the other part is provided for a split capacitor; the controller calculates the electric angle of the motor according to the rotor position information of the electrically excited doubly salient motor, namely the mechanical angle of the motor rotor; setting the opening angle of the A-phase winding as alpha, the closing angle as beta, and the beta-alpha is less than 120 degrees;
when the controller detects that the electrical angle of the motor is positioned at (alpha, beta), the first switching tube is conducted, the A-phase winding is in a positive excitation stage, and the C-phase winding is in a negative power generation state;
when the controller detects that the electrical angle of the motor is (alpha +120 degrees, beta +120 degrees), the sixth switching tube is conducted, the B-phase winding is in a negative excitation stage, and the A-phase winding is in a positive power generation state;
when the controller detects that the electrical angle of the motor is (alpha +240 degrees, beta +240 degrees), the fifth switching tube is conducted, the C-phase winding is in a positive excitation stage, and the B-phase winding is in a negative power generation state;
when the controller detects that the electrical angle of the motor is (alpha +360 degrees, beta +360 degrees), the fourth switch tube is conducted, the A-phase winding is in a negative excitation stage, and the C-phase winding is in a positive power generation state;
when the controller detects that the electrical angle of the motor is positioned at (alpha +480 degrees, beta +480 degrees), the third switching tube is conducted, the B-phase winding is in a positive excitation stage, and the A-phase winding is in a negative power generation state;
when the controller detects that the electrical angle of the motor is (alpha +600 degrees, 720 degrees) & [0 degrees, beta-120 degrees ], the second switching tube is conducted, the C-phase winding is in a negative excitation stage, and the B-phase winding is in a positive power generation state;
when the electrical angle of the motor is at other angles, each switch tube is in a closed state. The current of the fault-tolerant power generation of the three-phase electro-magnetic doubly salient motor when the system has a field loss fault is shown in fig. 3.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. The invention is not described in detail in order to avoid unnecessary repetition.
Claims (3)
1. The control method of the excitation double-salient-pole motor field loss fault-tolerant power generation system is characterized in that the excitation double-salient-pole motor field loss fault-tolerant power generation system comprises the following steps: the device comprises a direct-current power supply, an eleventh diode, a full-bridge converter, an electrically excited doubly salient motor, a controller, an asymmetric half-bridge converter, a position sensor, a first split capacitor, a second split capacitor, a load resistor and a switch;
the full-bridge converter comprises a first bridge arm, a second bridge arm and a third bridge arm which are connected in parallel; the anode of the direct current power supply is connected with the anode of an eleventh diode, the cathode of the direct current power supply is connected with the cathode of the first bridge arm, and the cathode of the eleventh diode is connected with the anode of the first bridge arm; the negative electrode of the first split capacitor is connected with the positive electrode of the second split capacitor to form a fourth bridge arm, and the connection position is the midpoint of the fourth bridge arm; the fourth bridge arm is connected with the third bridge arm in parallel; the load resistor is connected with the fourth bridge arm in parallel, and the voltage at two ends of the load resistor is output voltage; the electro-magnetic doubly salient motor comprises an A-phase winding, a B-phase winding, a C-phase winding and an excitation winding, wherein one ends of the A-phase winding, the B-phase winding and the C-phase winding are sequentially connected with the middle points of a first bridge arm, a second bridge arm and a third bridge arm of the full-bridge converter, the other ends of the A-phase winding, the B-phase winding and the C-phase winding are mutually connected to form a neutral point, and the neutral point is connected with the middle point of a fourth bridge arm through a switch; the excitation winding is connected with the asymmetric half-bridge converter in parallel, and the controller acquires excitation current information of the excitation winding, current information of A-phase, B-phase and C-phase windings, output voltage information and rotor position information of the electrically-excited doubly-salient motor; processing the acquired information to generate a driving signal for driving the full-bridge converter;
the full-bridge converter comprises first to sixth switching tubes and first to sixth diodes, the first to sixth switching tubes are connected with the first to sixth diodes in a reverse parallel mode in sequence, an emitting electrode of the first switching tube is connected with a collecting electrode of the fourth switching tube to form a first bridge arm, the connection position is the middle point of the first bridge arm, the collecting electrode of the first switching tube is the anode of the first bridge arm, and an emitting electrode of the fourth switching tube is the cathode of the first bridge arm; an emitter of the third switching tube is connected with a collector of the sixth switching tube to form a second bridge arm, and the connection position is the middle point of the second bridge arm; an emitter of the fifth switching tube is connected with a collector of the second switching tube to form a third bridge arm, and the connection position is the midpoint of the third bridge arm;
the method comprises the following steps:
step 1: the controller detects the exciting current i of the current exciting windingfA value of (a) if ifIf the magnetic field is more than 0, judging that the system is not demagnetized, and turning to the step 2; if ifIf the magnetic field is equal to 0, judging that the system is demagnetized, and turning to the step 3;
step 2, the switch is switched off, and the system generates power in a traditional uncontrolled rectification power generation mode through the first diode to the sixth diode, namely closed-loop control is carried out on the output voltage of the system by adjusting the exciting current; the method specifically comprises the following steps: if the output voltage is lower than the given voltage, the controller increases the exciting current; if the output voltage is higher than the given voltage, the controller reduces the exciting current;
and step 3: switching to a fault-tolerant operation mode for power generation, closing a switch, generating power by the system in a switched reluctance motor power generation mode, and performing chopping control on the currents of the A-phase winding, the B-phase winding and the C-phase winding so as to realize closed-loop control on output voltage;
the specific method for generating power by the system in a switched reluctance motor power generation mode comprises the following steps: setting the current flowing to a neutral point as a positive current direction, wherein the A-phase winding, the B-phase winding and the C-phase winding are in four states of positive excitation, positive power generation, reverse excitation and reverse power generation, wherein the currents of the A-phase winding, the B-phase winding and the C-phase winding are provided by two parts, one part is provided for the current power generation phase, and the other part is provided for a split capacitor; setting the on angle of phase A as alpha, the off angle as beta, the beta-alpha is less than 120 degrees;
when the controller detects that the electrical angle of the motor is positioned at (alpha, beta), the first switching tube is conducted, the A-phase winding is in a forward excitation stage, and the C-phase winding is in a reverse power generation state;
when the controller detects that the electrical angle of the motor is (alpha +120 degrees, beta +120 degrees), the sixth switching tube is conducted, the B-phase winding is in a reverse excitation stage, and the A-phase winding is in a forward power generation state;
when the controller detects that the electrical angle of the motor is (alpha +240 degrees, beta +240 degrees), the fifth switching tube is conducted, the C-phase winding is in a forward excitation stage, and the B-phase winding is in a reverse power generation state;
when the controller detects that the electrical angle of the motor is (alpha +360 degrees, beta +360 degrees), the fourth switch tube is conducted, the A-phase winding is in a reverse excitation stage, and the C-phase winding is in a forward power generation state;
when the controller detects that the electrical angle of the motor is (alpha +480 degrees, beta +480 degrees), the third switching tube is conducted, the B-phase winding is in a forward excitation stage, and the A-phase winding is in a reverse power generation state;
when the controller detects that the electrical angle of the motor is (alpha +600 degrees, 720 degrees) & [0 degrees, beta-120 degrees ], the second switching tube is conducted, the C-phase winding is in a reverse excitation stage, the B-phase winding is in a forward power generation state, one part of electric energy generated by the B-phase winding is excited by the C-phase winding through the sixth diode and the second switching tube, one part of the electric energy is supplied to the second split capacitor through the sixth diode, and other electric energy is supplied to the load resistor through the first split capacitor and the sixth diode.
2. The method according to claim 1, wherein the controller comprises a voltage and current detection conditioning circuit, a DSP, a CPLD logic synthesis circuit, a driving circuit and a position sensor, wherein the voltage and current detection conditioning circuit collects excitation current information of an excitation winding, current information and output voltage information of A-phase, B-phase and C-phase windings and transmits the collected information to the DSP and CPLD logic synthesis circuit; the position sensor is arranged in the electro-magnetic doubly salient motor, collects the position of a rotor of the electro-magnetic doubly salient motor and transmits the position information to the DSP and CPLD logic comprehensive circuit; the DSP and CPLD logic comprehensive circuit processes the received information to generate a driving signal; and supplies the driving signal to the full-bridge inverter through the driving circuit.
3. The method according to claim 1, wherein the specific method for realizing closed-loop control of the output voltage by chopping control of the current of the A-phase winding, the B-phase winding and the C-phase winding is as follows: the controller performs PI regulation on the error between the output voltage and the given voltage to obtain given current, performs PI regulation on the given current and the current of the current excited winding to obtain corresponding duty ratio, and if the output voltage is lower than the given voltage, the controller correspondingly increases the duty ratio of the full-bridge converter according to the obtained corresponding duty ratio; if the output voltage is higher than the given voltage, the controller correspondingly reduces the duty ratio of the full-bridge converter according to the obtained corresponding duty ratio.
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| CN113890434B (en) * | 2021-09-30 | 2022-05-27 | 南京航空航天大学 | Electro-magnetic doubly salient motor for realizing fault-tolerant control of excitation converter through dynamic switching |
| CN115800842B (en) * | 2022-12-20 | 2023-05-23 | 南京航空航天大学 | Electric excitation doubly salient motor loss-of-magnetic fault-tolerant power generation control method for optimizing dynamic performance |
| CN116566258B (en) * | 2023-07-05 | 2023-09-22 | 南京师范大学 | Pulse width modulation-based harmonic suppression method for electro-magnetic doubly salient generator |
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