CN111731102A - Motor winding active discharge control method based on direct-current voltage feedback control - Google Patents
Motor winding active discharge control method based on direct-current voltage feedback control Download PDFInfo
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- CN111731102A CN111731102A CN202010597491.8A CN202010597491A CN111731102A CN 111731102 A CN111731102 A CN 111731102A CN 202010597491 A CN202010597491 A CN 202010597491A CN 111731102 A CN111731102 A CN 111731102A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
- B60L3/0046—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electric energy storage systems, e.g. batteries or capacitors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/64—Electric machine technologies in electromobility
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- Sustainable Energy (AREA)
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- Mechanical Engineering (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
The invention relates to a motor winding active discharge control method based on direct-current voltage feedback control, which specifically comprises the following steps: step S1: the controller receives the discharging signal, enters a current control mode, detects the voltage of the direct current bus, and if the voltage of the direct current bus is smaller than the safety threshold value of the controller, the step S4 is carried out, otherwise, the step S2 is carried out; step S2: generating a triangular wave time domain signal value through a timer, acquiring a discharge time parameter and an excitation current modulation amplitude, and multiplying the triangular wave time domain signal value, the discharge parameter and the excitation current modulation amplitude to obtain an excitation effective current; step S3: generating a corresponding exciting current instruction according to the exciting effective current, inputting the exciting current instruction into the controller, discharging the high-voltage direct current capacitor by the controller according to the exciting current instruction, and turning to the step S1; step S4: the controller exits the current control mode. Compared with the prior art, the invention has the advantages of reducing the risk of voltage jump, improving the running safety of the electric vehicle and the like.
Description
Technical Field
The invention relates to the technical field of high-voltage capacitor quick discharge of electric automobiles, in particular to a motor winding active discharge control method based on direct-current voltage feedback control.
Background
According to the safety requirements of the electric automobile on functional safety, fault protection and electric shock protection, after the whole electric automobile collides, the vehicle-mounted motor controller reduces the voltage of the high-voltage direct-current capacitor to be below a safe voltage range of 60v within 3 s. Because the passive discharge method cannot realize such a high discharge speed, the current vehicle-mounted motor controller has an active discharge function, and the system can quickly reduce the voltage of the direct-current bus to be below 60v after the power supply of the electric vehicle is disconnected or a collision occurs. The first type is to discharge through an auxiliary circuit, and utilize an RC (resistance-capacitance) loop with a smaller time constant to quickly release energy on a direct-current capacitor, and the second type is to discharge through a motor stator winding and consume the energy on the capacitor by utilizing current without generating torque.
Typical active discharge current commands are step inputs or square wave inputs. The step input has a problem that a minute torque is caused due to a small error of a zero angle, and a current is a constant direct current during the power-off process at a stop, which is disadvantageous to heat dissipation of the device. The problem with a square wave input, as shown in fig. 1, is that the voltage on the capacitor fluctuates dramatically due to rapid changes in the current command, and there are jump-up situations, even from below 60v safe voltage jump over 60v, where such voltage response is undesirable and dangerous.
The prior art discloses a method for quickly discharging a high-voltage capacitor of a motor controller of an electric vehicle, when the voltage of the capacitor end is greater than a safe voltage, a stator winding of a permanent magnet synchronous motor is used for quickly discharging, but the situation that the voltage value is increased from the safe voltage to exceed a safe voltage threshold before being stabilized exists in the discharging process, and the danger coefficient is large.
Disclosure of Invention
The invention aims to overcome the defect of voltage jump in the process of discharging the stator winding of the motor in the prior art, and provides a motor winding active discharge control method based on direct-current voltage feedback control.
The purpose of the invention can be realized by the following technical scheme:
a motor winding active discharge control method based on direct current voltage feedback control specifically comprises the following steps:
step S1: the controller receives the discharging signal, enters a current control mode, detects the voltage of the direct current bus, and if the voltage of the direct current bus is smaller than the safety threshold value of the controller, the step S4 is carried out, otherwise, the step S2 is carried out;
step S2: generating a triangular wave time domain signal value through a timer, acquiring a discharge time parameter and an exciting current modulation amplitude, and multiplying the triangular wave time domain signal value, the discharge parameter and the exciting current modulation amplitude to obtain an exciting effective current;
step S3: generating a corresponding exciting current instruction according to the exciting effective current, inputting the exciting current instruction into a controller, discharging the high-voltage direct current capacitor by the controller according to the exciting current instruction, and turning to the step S1;
step S4: the controller exits the current control mode.
The frequency of the triangular wave time domain signal value is 20 Hz.
The peak value of the triangular wave time domain signal value is 2 amplitude units.
The safety threshold of the controller is less than 60V.
Further, the safety threshold of the controller is 50V.
Further, the excitation current modulation amplitude and the direct current bus voltage have an inverse relation.
Further, the calculation formula of the excitation current modulation amplitude is as follows:
INVSCALE＝1.0-50/VDC
wherein INVSCLE is the excitation current modulation amplitude, and VDC is the DC bus voltage.
Further, the calculation formula of the excitation effective current is as follows:
ID＝TRI*GT*INVSCALE
wherein ID is an excitation effective current, GT is a discharge time parameter, and TRI is a triangular wave time domain signal value.
The discharge time parameter is adjusted according to the actual total discharge time requirement, and the larger the discharge time parameter is, the smaller the corresponding total discharge time is.
Further, the total discharge time is less than 1 s.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention uses the triangular wave time domain signal value as a parameter to calculate in the excitation effective current, so that the voltage on the high-voltage direct current capacitor is monotonically decreased under the condition of meeting the discharge time requirement, the discharge is controllable, the risk of voltage jump does not exist in the inversion process, and the driving safety of the electric vehicle is improved.
2. The invention calculates through the inverse ratio curve of the direct current bus voltage when calculating the exciting current modulation amplitude, makes the energy of the motor stator winding and the direct current bus capacitor decrease monotonously in the discharging process, even if the controller switches to the controlled rectification state, the invention can play a good role in inhibiting the voltage pump rise caused by the winding follow current.
Drawings
FIG. 1 is a schematic diagram of a voltage step-up according to the present invention;
FIG. 2 is a schematic flow chart of the present invention;
FIG. 3 is a prior art DC voltage ripple plot;
FIG. 4 is a DC voltage fluctuation diagram according to the present invention;
fig. 5 is a schematic diagram of an inverse ratio curve of the excitation current modulation amplitude and the dc bus voltage according to the present invention.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
As shown in fig. 2, a method for controlling active discharge of a motor winding based on dc voltage feedback control, which is controllable in discharge and free from voltage jump during inversion, specifically includes the following steps:
step S1: the controller receives the discharging signal, enters a current control mode, detects the voltage of the direct current bus, and if the voltage of the direct current bus is smaller than the safety threshold value of the controller, the step S4 is carried out, otherwise, the step S2 is carried out;
step S2: generating a triangular wave time domain signal value through a timer, acquiring a discharge time parameter and an excitation current modulation amplitude, and multiplying the triangular wave time domain signal value, the discharge parameter and the excitation current modulation amplitude to obtain an excitation effective current;
step S3: generating a corresponding exciting current instruction according to the exciting effective current, inputting the exciting current instruction into the controller, discharging the high-voltage direct current capacitor by the controller according to the exciting current instruction, and turning to the step S1;
step S4: the controller exits the current control mode.
The frequency of the triangular wave time domain signal value is 20 Hz.
The peak value of the triangular wave time domain signal value is 2 amplitude units.
The safety threshold of the controller is less than 60V.
The safety threshold of the controller is 50V.
As shown in fig. 5, the field current modulation amplitude is inversely related to the dc bus voltage.
The calculation formula of the excitation current modulation amplitude is as follows:
INVSCALE＝1.0-50/VDC
wherein INVSCLE is the excitation current modulation amplitude, and VDC is the DC bus voltage.
The calculation formula of the excitation effective current is as follows:
ID＝TRI*GT*INVSCALE
wherein ID is an excitation effective current, GT is a discharge time parameter, and TRI is a triangular wave time domain signal value.
And the discharge time parameter is adjusted according to the actual total discharge time requirement, and the larger the discharge time parameter is, the smaller the corresponding total discharge time is, and the total discharge time is less than 1 s.
As shown in fig. 3, the dc voltage fluctuation of the prior art has a voltage jump spike during the discharge, and when the discharge is finished, the dc bus voltage jumps by more than 60V, which is the limit of the safe voltage range. The voltage jump will cause the discharge time to time out with potential safety risks.
As shown in FIG. 4, when the technical scheme of the invention is adopted for discharging, the voltage of the direct current bus monotonically decreases along with time no matter in the discharging process or at the end of discharging, the process of any jump is avoided, the risk that the voltage exceeds the safety limit value by 60V due to the voltage jump is effectively reduced, and meanwhile, due to good damping characteristics, hysteresis characteristics are not required to be arranged to ensure that the voltage after discharging is lower than 60V.
In addition, it should be noted that the specific embodiments described in the present specification may have different names, and the above descriptions in the present specification are only illustrations of the structures of the present invention. All equivalent or simple changes in the structure, characteristics and principles of the invention are included in the protection scope of the invention. Various modifications or additions may be made to the described embodiments or methods may be similarly employed by those skilled in the art without departing from the scope of the invention as defined in the appending claims.
Claims (10)
1. A motor winding active discharge control method based on direct current voltage feedback control is characterized by comprising the following steps:
step S1: the controller receives the discharging signal, enters a current control mode, detects the voltage of the direct current bus, and if the voltage of the direct current bus is smaller than the safety threshold value of the controller, the step S4 is carried out, otherwise, the step S2 is carried out;
step S2: generating a triangular wave time domain signal value through a timer, acquiring a discharge time parameter and an exciting current modulation amplitude, and multiplying the triangular wave time domain signal value, the discharge parameter and the exciting current modulation amplitude to obtain an exciting effective current;
step S3: generating a corresponding exciting current instruction according to the exciting effective current, inputting the exciting current instruction into a controller, discharging the high-voltage direct current capacitor by the controller according to the exciting current instruction, and turning to the step S1;
step S4: the controller exits the current control mode.
2. The method for controlling the active discharge of the motor winding based on the direct-current voltage feedback control as claimed in claim 1, wherein the frequency of the triangular wave time domain signal value is 20 Hz.
3. The active discharge control method for the motor winding based on the direct-current voltage feedback control as claimed in claim 1, wherein the peak value of the triangular wave time domain signal value is 2 amplitude units.
4. The motor winding active discharge control method based on direct current voltage feedback control as claimed in claim 1, characterized in that the safety threshold of the controller is less than 60V.
5. The active discharge control method for motor windings based on DC voltage feedback control as claimed in claim 4, wherein the safety threshold of the controller is 50V.
6. The method for controlling the active discharge of the motor winding based on the direct-current voltage feedback control as claimed in claim 5, wherein the excitation current modulation amplitude has an inverse relation with the direct-current bus voltage.
7. The method for controlling the active discharge of the motor winding based on the direct-current voltage feedback control as claimed in claim 6, wherein the calculation formula of the excitation current modulation amplitude is as follows:
INVSCALE＝1.0-50/VDC
wherein INVSCLE is the excitation current modulation amplitude, and VDC is the DC bus voltage.
8. The method for controlling the active discharge of the motor winding based on the direct-current voltage feedback control as claimed in claim 7, wherein the calculation formula of the excitation effective current is as follows:
ID＝TRI*GT*INVSCALE
wherein ID is an excitation effective current, GT is a discharge time parameter, and TRI is a triangular wave time domain signal value.
9. The active discharge control method for motor windings based on dc voltage feedback control as claimed in claim 1, wherein the larger the discharge time parameter is, the smaller the corresponding total discharge time is.
10. The method of claim 9, wherein the total discharge time is less than 1 s.
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Citations (8)
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|---|---|---|---|---|
| US4783716A (en) * | 1986-01-30 | 1988-11-08 | Canon Kabushiki Kaisha | Charging or discharging device |
| CN105270182A (en) * | 2014-06-27 | 2016-01-27 | 联合汽车电子有限公司 | Discharging method of new energy automobile for bus high voltage |
| EP3075593A1 (en) * | 2015-04-01 | 2016-10-05 | MAN Truck & Bus AG | Method for discharging an electrical energy store of a motor vehicle |
| CN109301889A (en) * | 2018-08-30 | 2019-02-01 | 深圳熙斯特新能源技术有限公司 | A kind of method of electric vehicle motor controller high-voltage capacitance repid discharge |
| CN109378814A (en) * | 2018-11-01 | 2019-02-22 | 东南大学 | A kind of energy management method of direct current power spring system and its internal energy-storage system |
| CN209593811U (en) * | 2018-08-31 | 2019-11-05 | 厦门市必易微电子技术有限公司 | Adaptive circuit module, the LED drive circuit with controllable silicon dimmer |
| CN110920398A (en) * | 2019-11-11 | 2020-03-27 | 苏州汇川联合动力系统有限公司 | Active discharge circuit and power electronic equipment |
| CN210806736U (en) * | 2019-10-30 | 2020-06-19 | 华域麦格纳电驱动系统有限公司 | Active discharging closed-loop control circuit of motor controller of electric automobile |
-
2020
- 2020-06-28 CN CN202010597491.8A patent/CN111731102B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4783716A (en) * | 1986-01-30 | 1988-11-08 | Canon Kabushiki Kaisha | Charging or discharging device |
| CN105270182A (en) * | 2014-06-27 | 2016-01-27 | 联合汽车电子有限公司 | Discharging method of new energy automobile for bus high voltage |
| EP3075593A1 (en) * | 2015-04-01 | 2016-10-05 | MAN Truck & Bus AG | Method for discharging an electrical energy store of a motor vehicle |
| CN109301889A (en) * | 2018-08-30 | 2019-02-01 | 深圳熙斯特新能源技术有限公司 | A kind of method of electric vehicle motor controller high-voltage capacitance repid discharge |
| CN209593811U (en) * | 2018-08-31 | 2019-11-05 | 厦门市必易微电子技术有限公司 | Adaptive circuit module, the LED drive circuit with controllable silicon dimmer |
| CN109378814A (en) * | 2018-11-01 | 2019-02-22 | 东南大学 | A kind of energy management method of direct current power spring system and its internal energy-storage system |
| CN210806736U (en) * | 2019-10-30 | 2020-06-19 | 华域麦格纳电驱动系统有限公司 | Active discharging closed-loop control circuit of motor controller of electric automobile |
| CN110920398A (en) * | 2019-11-11 | 2020-03-27 | 苏州汇川联合动力系统有限公司 | Active discharge circuit and power electronic equipment |
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Address after: 215000 No.99 tangjiabang Road, Suzhou Industrial Park, Suzhou City, Jiangsu Province Patentee after: Borg Warner drive system (Suzhou) Co.,Ltd. Address before: 215000 No.99 tangjiabang Road, Suzhou Industrial Park, Suzhou City, Jiangsu Province Patentee before: Delphi Technology (Suzhou) Co.,Ltd. |
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