CN114362632A - Active discharge control method and control system - Google Patents
Active discharge control method and control system Download PDFInfo
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Abstract
The invention provides an active discharge control method and a control system, which relate to the technical field of automotive electronics, are applied to a single-phase open circuit of a multi-phase motor and comprise the following steps: the control unit detects an emergency power-off signal; acquiring real-time current output by a multi-phase motor by using a current sensor, wherein the real-time current is any phase current of the multi-phase motor under a non-open circuit two-phase condition; calculating positive and negative high-frequency current driving signals matched with the real-time current according to the real-time current, wherein the positive and negative high-frequency current driving signals are used for generating positive and negative high-frequency currents; the positive and negative high-frequency currents are set to generate winding loss after being input into the multi-phase motor and output equivalent zero moment; the control unit controls the release of the positive and negative high-frequency currents so as to output the positive and negative high-frequency currents to the multi-phase motor through the inverter for discharging, and the problem that active discharging cannot be achieved when the motor is in a single-phase open circuit is solved.
Description
Technical Field
The invention relates to the technical field of automotive electronics, in particular to an active discharge control method and system.
Background
The new energy automobile works in a high-voltage environment, along with the rapid development of the new energy automobile, people pay more and more attention to the high-voltage safety of the new energy automobile, and the high-voltage safety requirement of an electric drive system of the new energy automobile is higher and higher. After the vehicle is powered off when running and stopping, the control unit is internally provided with high voltage, so that an active discharging safety strategy of a motor system is required.
In the prior art, two discharge modes, namely hardware discharge and motor winding discharge, are generally adopted, wherein the hardware discharge mostly adopts a power discharge resistor, the discharge strategy is that a vehicle control unit requests a control unit to execute active discharge, and the control unit starts to execute the active discharge when confirming that a main positive contactor and a main negative contactor are both disconnected; active discharge is energy dissipation using windings of a multiphase motor. However, when the multi-phase motor is in a single-phase open circuit, the remaining two groups of windings can only generate current vectors in fixed directions, so that when the motor is in a single-phase open circuit in the running process of the whole vehicle, the active discharge function can not be realized by using a conventional three-phase control system control strategy, and at the moment, the safety risk is higher, and the motor can be greatly damaged.
Disclosure of Invention
In order to overcome the technical defects, the invention aims to provide an active discharge control method and a control system, which are used for solving the problem that active discharge cannot be realized when a motor is in a single-phase open circuit.
The invention discloses an active discharge control method of a motor, which is applied to a single-phase open circuit of a multi-phase motor and comprises the following steps:
the control unit detects the down electric signal and,
acquiring real-time current output by a multi-phase motor by using a current sensor, wherein the real-time current is any phase current of the multi-phase motor under a non-open circuit two-phase condition;
calculating positive and negative high-frequency current driving signals matched with the real-time current according to the real-time current, wherein the positive and negative high-frequency current driving signals are used for generating positive and negative high-frequency currents;
the positive and negative high-frequency currents are set to generate winding loss after being input into the multi-phase motor and output equivalent zero moment;
the control unit controls the release of the positive and negative high-frequency currents so as to be output to the multi-phase motor through the modulation module and the inverter for discharging.
Preferably, the method further comprises the following steps:
acquiring the temperature of a lower winding of each phase of the multi-phase motor by adopting a temperature sensor;
and when the winding temperature of any phase circuit exceeds a threshold value, marking that the phase circuit is in an open circuit state, and marking that other phase circuits are in a non-open circuit state.
Preferably, for either phase of the circuit in a non-open circuit of two phases,
according to the positive and negative high-frequency currents released to the multi-phase motor and a control strategy executed by the control module, the generated discharge current wave is a single-phase sine wave, a positive and negative direct current wave or a trapezoidal wave.
Preferably, the control unit controls the release of the positive and negative high-frequency currents, including the following:
and the control unit executes a PID control strategy, an internal model control strategy or an asymmetric trapezoidal wave control strategy and releases the positive and negative high-frequency currents.
The invention also provides an active discharge control system, which is characterized by comprising the following components:
the device comprises a modulation module, an inverter, a multi-phase motor and a control unit for active discharge control;
the control unit includes:
the signal receiving subunit is used for detecting the lower electric signal by the control unit;
the current acquisition subunit is used for acquiring real-time current output by the multi-phase motor by adopting a current sensor, wherein the real-time current is any phase current of the multi-phase motor under a non-open circuit two-phase condition;
the high-frequency current subunit is used for calculating positive and negative high-frequency current driving signals matched with the real-time current according to the real-time current, and the positive and negative high-frequency current driving signals are used for generating positive and negative high-frequency currents; the positive and negative high-frequency currents are set to generate winding loss after being input into the multi-phase motor and output equivalent zero moment;
and the execution subunit is used for controlling the control unit to release the positive and negative high-frequency currents so as to be output to the multi-phase motor through the modulation module and the inverter for discharging.
Preferably, the method further comprises the following steps:
the temperature control subunit is used for acquiring the temperature of the lower winding of each phase of the multi-phase motor by adopting a temperature sensor; and when the winding temperature of any phase circuit exceeds a threshold value, marking that the phase circuit is in an open circuit state, and marking that other phase circuits are in a non-open circuit state.
Preferably, the execution subunit executes a PID control strategy, an internal model control strategy, or an asymmetric trapezoidal wave control strategy, and releases the positive and negative high-frequency currents.
After the technical scheme is adopted, compared with the prior art, the method has the following beneficial effects:
the scheme is applied to the scene of single-phase open circuit (or phase loss) of the motor, emergency power-off is carried out in the running process of the whole vehicle, real-time current of a phase circuit of a multi-phase motor, which is not in an open circuit state, is obtained, positive and negative high-frequency current which is in positive-negative symmetry with the current vector of the real-time current and is obtained is released, so that high-frequency torque is generated and mutually offset, the high-frequency torque sequentially passes through a modulation module, an inverter and the multi-phase motor, equivalent zero torque is output, resistance loss is generated by using a winding of a phase which is not in an open circuit state on the motor so as to complete a discharging process, and the problem that active discharging cannot be realized when the motor is in a single-phase open circuit state is solved.
Drawings
Fig. 1 is a flowchart of a method according to a first embodiment and a second embodiment of the active discharge control method and system of the present invention;
fig. 2 is a schematic diagram of the active discharge control method and control system according to the first embodiment and the second embodiment of the present invention, which is used for embodying the input to the multi-phase motor through the modulation module and the inverter;
fig. 3 is a schematic diagram of a discharge current waveform according to a first embodiment and a second embodiment of the active discharge control method and system of the present invention;
fig. 4 is a schematic block diagram of a second embodiment of the active discharge control method and control system according to the present invention.
Reference numerals:
51-a modulation module; 52-an inverter; 53-a multi-phase motor; 54-a control unit; 541-a signal receiving subunit; 542-a current acquisition subunit; 543-high frequency current subunit; 544-an execution subunit; 545-temperature control subunit.
Detailed Description
The advantages of the invention are further illustrated in the following description of specific embodiments in conjunction with the accompanying drawings.
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. The following description refers to the accompanying drawings, in which like numerals refer to the same or similar elements throughout the different views, unless otherwise specified. The implementations described in the following exemplary examples do not represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.
The terminology used in the present disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used in this disclosure and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
It is to be understood that although the terms first, second, third, etc. may be used herein to describe various information, such information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present disclosure. The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination", depending on the context.
In the description of the present invention, it is to be understood that the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings, which are used for convenience in describing the present invention and for simplicity in description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting.
In the description of the present invention, unless otherwise specified and limited, it is to be noted that the terms "mounted," "connected," and "connected" are used in a broad sense, and for example, they may be mechanically or electrically connected, or they may be connected internally to two elements, directly or indirectly through an intermediate, and those skilled in the art will understand the specific meaning of the terms as they are used in the specific case.
In the following description, suffixes such as "sub-unit", "means", or "unit" used to denote elements are used only for facilitating the explanation of the present invention, and have no specific meaning in themselves. Thus, "subunits" and "parts" may be used in a mixture.
The first embodiment is as follows: the present embodiment provides an active discharge control method, referring to fig. 1 to fig. 3, applied to a single-phase open circuit of a multi-phase motor (the following motors are all multi-phase motors, which are only described for convenience, and specifically take a three-phase motor as an example), including the following steps:
s100: the control unit detects the down electric signal and,
that is, this embodiment is used for the motor single-phase open circuit or the initiative when lacking the looks urgent power off when cutting off the electricity in the whole car operation process and discharges, consequently need carry out follow-up operation according to the signal of telecommunication promptly down, specifically, under the actual scene, promptly to cut off the power, cut off low-voltage storage battery negative pole connector, disconnection BMS fuse or disconnection maintenance switch, promptly should promptly the list can be carried out or be carried out because of the trouble is carried out passively.
In addition to the single-phase open circuit or phase loss of the motor caused by active operation or failure, specifically, when the real-time current is determined by using the collected current, current sensors are arranged at each phase output of the multi-phase motor, and according to the monitoring result of each current sensor, when a certain phase current value is abnormal (suddenly dropped), the phase is marked to be in the open circuit, and the remaining phases are normal and considered to be the condition of phase loss, the active discharge method proposed in the scheme can be adopted at this time, and specifically, the method comprises the following steps:
s110: acquiring the temperature of a lower winding of each phase of the multi-phase motor by adopting a temperature sensor;
taking a three-phase motor as an example, three phases (three-phase circuits, in this embodiment, each phase of the motor corresponds to one-phase circuit, and it is described that the first phase, the second phase, or the third phase is described as convenient) of the multi-phase motor are described as a first-phase circuit, a second-phase circuit, and a third-phase circuit, so that it is convenient to describe the circuits later. Acquiring winding temperatures on a first phase circuit, a second phase circuit and a third phase circuit of the three-phase motor by adopting a temperature sensor; specifically, a plurality of temperature sensors are arranged to monitor the winding temperature of each phase circuit of the circuit, the winding temperature of the phase circuit is increased when the phase is locked (i.e., the phase is open, i.e., one of the phases is in an open state), and when the winding temperature of any phase circuit exceeds a threshold value, the phase winding is no longer suitable for continuing to work, and the phase circuit is marked to be in an "open state", i.e., the phase is in an equivalent open state, so that active discharge can be performed by using the method of releasing positive and negative high-frequency currents in the present embodiment, based on that the phase circuit can be regarded as being open or in an open state.
S120: and when the winding temperature of any phase circuit exceeds a threshold value, marking that the phase circuit is in an open circuit state, and marking that other phase circuits are in a non-open circuit state.
That is, when the winding temperature of the first phase circuit exceeds the threshold, it is determined that the first phase circuit is in an open circuit state, and the second phase circuit and the third phase circuit are in a non-open circuit state. Based on the above, when the temperature of any phase winding is high, it may be determined that the phase winding is in the open state, in the above step, the first phase circuit, the second phase circuit, and the third phase circuit are all used to distinguish three phases on the motor, and are not limited to a specific phase, that is, the second phase circuit or the third phase circuit may be marked to be in the open state.
S200: acquiring real-time current output by a multi-phase motor by using a current sensor, wherein the real-time current is any phase current of the multi-phase motor under a non-open circuit two-phase condition;
in the embodiment, one of the multiple-phase motors is in an open circuit, that is, a phase is lost, the two-phase windings can only generate current vectors in a fixed direction, at this time, the current vectors generated on the two windings are not opposite, so that the generated moments cannot be mutually offset, and the two currents are consistent in magnitude, so that any phase current can be acquired. The current is collected here primarily for use in subsequent steps.
S300: calculating positive and negative high-frequency current driving signals matched with the real-time current according to the real-time current, wherein the positive and negative high-frequency current driving signals are used for generating positive and negative high-frequency currents;
as mentioned above, the two phase windings can only generate current vectors in a fixed direction, but at this time, the two current vectors are not in opposite directions (i.e. the directions may be identical or asymmetrical), so that the real-time current can be obtained in step S200, and therefore, another high-frequency current can be applied to the circuit according to the real-time current, so that a current vector which is in positive-negative symmetry with the current vectors generated by the two phase windings is generated, and a high-frequency torque is generated and the positive and negative are cancelled out, thereby solving the problem that the active discharge cannot be realized when the motor is in a single-phase open circuit.
It is emphasized that the positive and negative high-frequency currents are set to generate winding loss after being input into the multi-phase motor and output equivalent zero moment; the input positive and negative high-frequency current and the current vector corresponding to the real-time current are in positive and negative symmetry and consistent in magnitude, so that the moment generated by the real-time current can be consistent and mutually offset, and the output equivalent zero moment is output.
S400: the control unit controls the release of the positive and negative high-frequency currents (i in the figure)ref) And the output is output to the multi-phase motor through the modulation module and the inverter for discharging.
In the above steps, the modulation module includes but is not limited to PWM (pulse width modulation) (unipolar modulation, bipolar modulation), SPWM (sinusoidal pulse width modulation), SPWM inputs a pulse sequence with equal amplitude to equate to sinusoidal wave, the output is high, the pulse time width changes substantially in sinusoidal law, the active discharge of the commonly used multiphase motor in the non-phase-loss state adopts SVPWM (space vector pulse width modulation), and the present embodiment also preferably adopts PWM or SPWM method from the power source perspective due to phase loss to generate a sinusoidal power source with adjustable frequency and voltage. The modulation module is used for adjusting the on-off frequency of the positive and negative high-frequency currents, and the inverter converts the direct current into constant-frequency voltage or alternating current with frequency and voltage modulation.
Specifically, the control unit controls the release of the positive and negative high-frequency currents, and includes the following: the control unit executes a PID control strategy, an internal model control strategy or an asymmetric trapezoidal wave control strategy to release the positive and negative high frequency currents, and specifically, the asymmetric trapezoidal wave control strategy may form a discharge current having a trapezoidal wave waveform as described below (fig. 3(c)) for explaining the asymmetric trapezoidal wave control strategy, as an example, the asymmetric trapezoidal wave control strategy may be executed by including a first control flow (D1) and a second control flow (D2), D1 is used to adjust a rising edge time of a trapezoidal wave, D2 is used to adjust a falling edge time of the trapezoidal wave, then there are a set of values D1 and D2 to transform the trapezoidal wave into a triangular wave, and the frequency of the trapezoidal wave is fixed and needs to be adapted according to a voltage level and motor information, the first control flow output is a product of a dc bus voltage and a preset coefficient, and when the dc bus voltage is higher, D1 is larger, the trapezoidal wave current rise time becomes longer and the current increases, D2 becomes D1+ D3, and D3 is a compensation amount for suppressing the trapezoidal wave dc offset. Considering the asymmetry of the modulation and inverter module output currents, which may cause the motor output current to be asymmetric, it is necessary to use D3 for regulation, e.g., D3>0, D2> D1 when the trapezoidal wave has a positive dc bias; at this time, the falling time of the trapezoidal wave > the rising time of the trapezoidal wave, and the forward dc bias of the trapezoidal wave is reduced. To determine if this dc offset is present, it may be convenient to detect current point I1 at the midpoint of the falling edge of the trapezoidal wave, and consider that a dc offset is present if I1>0 (with a certain threshold range).
The PID control strategy is implemented to generate a discharge current having a single-phase sine wave, positive and negative dc current waves (specifically, a discharge current having a different waveform according to a difference between positive and negative high-frequency current waveforms), and includes P-ratio control, I-integral control, and D-derivative control, in which the PID control strategy itself has a capability of suppressing high-frequency noise and low-frequency external disturbance, and more specifically, by way of example and not limitation, the PID control strategy and bipolar PWM modulation are used to generate a discharge current having a sine waveform (fig. 3(a)), and the internal model control strategy and unipolar PWM modulation are used to generate a discharge current having positive and negative dc waveforms (fig. 3 (b)). Besides the asymmetric trapezoidal wave control strategy, the PID control strategy or the internal model control strategy, a hysteresis current control strategy can be adopted, hysteresis control is also called ripple regulator control, and the hysteresis control is to connect the output of the switch function calculation module to a hysteresis comparator to generate a control pulse, control the on-off state of a switch and realize a control target.
Thus, based on the above, with reference to fig. 3, for any one of the two phases in a non-open circuit, the discharge current wave generated is a single-phase sine wave (fig. 3(a)), a positive-negative direct current wave (fig. 3(b)), or a trapezoidal wave (fig. 3(c)) according to the positive-negative high-frequency current discharged to the multiphase motor and the control strategy executed by the control unit. Therefore, unlike winding discharge in a non-open phase state of a conventional multi-phase motor, the conventional multi-phase motor can only generate discharge current with three-phase sine wave, but in the present embodiment, because positive and negative high-frequency currents symmetrical to current in a non-open phase circuit of the motor are introduced, the discharge current with single-phase sine wave, positive and negative direct current waves or trapezoidal wave can be generated in each phase of the motor in a non-open phase state according to the positive and negative high-frequency currents and a control strategy (including the above-mentioned asymmetrical trapezoidal wave control strategy and the PID control strategy).
In the embodiment, when the motor is powered off when a single-phase open circuit or a phase loss occurs in the running process of the whole vehicle, the real-time current of the phase circuit of the motor in a non-open circuit state is monitored, positive and negative high-frequency currents which are in positive-negative symmetry with the current vector of the real-time current are released, so that high-frequency moments are generated and offset with each other, an equivalent zero moment is output, resistance loss is generated by the remaining windings in the phase of the non-open circuit state to complete the discharging process, the problem that active discharging cannot be achieved when the motor is in the single-phase open circuit state is solved, the on-off frequency of the positive and negative high-frequency currents can be adjusted by the module to achieve different control strategies, and the discharging current without waveform is controlled to be formed, so that the requirements of different scenes are met.
Example two: the present embodiment provides an active discharge control system, referring to fig. 1 to 4, which executes the active discharge control method according to the first embodiment, specifically, the active discharge control system includes the following:
a modulation module 51, an inverter 52, a multiphase motor 53, and a control unit 54 for active discharge control; the control unit 54 is configured to receive an emergency power-off signal, input positive and negative high-frequency currents, sequentially pass through the modulation module 51, the inverter 52, and the multi-phase motor 53, and output an equivalent zero torque, which is used for active discharge in a phase-loss state or in a single-phase open circuit of the motor (multi-phase motor, for convenience of description).
Referring to fig. 3, the control unit 54 includes:
a signal receiving subunit 541, configured to detect a down electric signal by the control unit;
the current acquisition subunit 542 is configured to acquire a real-time current output by the multiphase motor by using a current sensor, where the real-time current is any phase current of the multiphase motor in two phases where the multiphase motor is not in an open circuit;
specifically, the current vectors generated on the two windings are not opposite, so that the generated moments cannot be mutually offset, and the two currents are consistent in magnitude, so that the current acquisition subunit controls the current sensor to acquire any phase current.
A high-frequency current sub-unit 543 for calculating positive and negative high-frequency current driving signals matched with the real-time current according to the real-time current, wherein the positive and negative high-frequency current driving signals are used for generating positive and negative high-frequency currents; the positive and negative high-frequency currents are set to generate winding loss after being input into the multi-phase motor and output equivalent zero moment;
specifically, because the two windings are not in the same direction, and cannot generate mutually offset moments, another high-frequency current can be applied to the circuit according to the real-time current, so that the high-frequency current can generate a current vector which is in positive-negative symmetry with the current vectors generated by the two windings, so as to generate a high-frequency moment and the positive-negative offset, and thus the problem that active discharge cannot be realized when the motor is in a single-phase open circuit is solved, and therefore the high-frequency current subunit 543 can determine the magnitude of the positive-negative high-frequency current required by the motor according to the current acquisition subunit 542, so as to supply a current which just outputs an equivalent zero moment.
And an execution subunit 544, configured to control the control unit to release the positive and negative high-frequency currents to be output to the multiphase motor through the modulation module 51 and the inverter 52 for discharging. Specifically, the execution subunit 544 executes a PID control strategy, an internal model control strategy, or an asymmetric trapezoidal wave control strategy to release the positive and negative high-frequency currents. Besides the implementation of the PID control strategy, the internal model control strategy or the asymmetric trapezoidal wave control strategy described in the first embodiment, a hysteresis current control strategy may also be adopted, and the modulation module may be adopted to automatically control and adjust the on-off frequency of the high-frequency current, so as to generate the discharge current of a single-phase sine wave, a positive-negative direct current wave or a trapezoidal wave, so as to meet the requirements of different scenes.
Specifically, as an alternative, the active discharge control system further includes:
the temperature control subunit 545 is used for acquiring the temperature of the lower winding of each phase of the multi-phase motor by using a temperature sensor; and when the winding temperature of any phase circuit exceeds a threshold value, marking that the phase circuit is in an open circuit state, and marking that other phase circuits are in a non-open circuit state.
In addition to the open circuit or open phase of the motor single phase caused by active operation or fault, the condition that the real-time current sudden change or temperature change exceeds the preset range can be regarded as the open phase, therefore, by using the active discharge method of the scheme, taking the three-phase motor as an example, when the collected real-time current is used for determination, current sensors are arranged at each phase output of the multi-phase motor, according to the monitoring result of each current sensor, when one phase current value is abnormal (suddenly dropping), the phase is marked to be in the open circuit, and the rest two phases are normal. When the temperatures of the phases are used for determination, the temperature control subunit 545 may be used to collect the temperatures of the phases, and when the temperature of the winding of the phase circuit increases due to stalling (i.e., phase loss, i.e., one of the phases is in an open circuit state), the phase is not suitable for further operation, and therefore, based on this, it is determined which phase corresponds to the phase loss or the open circuit state.
In this embodiment, in the scenario of single-phase open circuit (or open phase) of the motor (or equivalent open phase scenario determined by the temperature control subunit 545), after the signal receiving subunit 541 receives the down electrical signal during the operation of the entire vehicle, the current obtaining subunit 542 monitors the real-time current of the phase circuit of the motor in the non-open circuit, the execution subunit 544 releases the positive and negative high-frequency currents obtained from the high-frequency current subunit 543 and having positive and negative symmetry with the current vector of the real-time current, so as to generate and cancel the high-frequency moments, output the equivalent zero moment, pass through the modulation module 51, the inverter 52 and the multi-phase motor 53 in sequence, output the equivalent zero moment, generate the resistance loss by using the remaining windings in the non-open circuit phases to complete the discharging process, thereby solving the problem that the active discharging cannot be realized during the single-phase open circuit of the motor, and using different control strategies (the PID control strategies mentioned above, or the PID control strategies mentioned above as the strategy, Asymmetric trapezoidal wave control strategy, etc.) to generate discharge currents of different waveforms, and the modulation module 51 adjusts the on-off frequency of the positive and negative high-frequency currents to meet the use requirements in different scenes.
It should be noted that the embodiments of the present invention have been described in terms of preferred embodiments, and not limited to any particular form, and those skilled in the art may modify and modify the above-described embodiments in accordance with the principles of the present invention without departing from the scope of the present invention.
Claims (7)
1. An active discharge control method is applied to a single-phase open circuit of a multi-phase motor, and comprises the following steps: the control unit detects the down electric signal and,
acquiring real-time current output by a multi-phase motor by using a current sensor, wherein the real-time current is any phase current of the multi-phase motor under a non-open circuit two-phase condition;
calculating positive and negative high-frequency current driving signals matched with the real-time current according to the real-time current, wherein the positive and negative high-frequency current driving signals are used for generating positive and negative high-frequency currents;
the positive and negative high-frequency currents are set to generate winding loss after being input into the multi-phase motor and output equivalent zero moment; the control unit controls the release of the positive and negative high-frequency currents so as to be output to the multi-phase motor through the modulation module and the inverter for discharging.
2. The control method according to claim 1, characterized by further comprising:
acquiring the temperature of a lower winding of each phase of the multi-phase motor by adopting a temperature sensor;
and when the winding temperature of any phase circuit exceeds a threshold value, marking that the phase circuit is in an open circuit state, and marking that other phase circuits are in a non-open circuit state.
3. The control method according to claim 1, characterized in that:
for either phase of the circuit in a non-open circuit two phases,
according to the positive and negative high-frequency currents released to the multi-phase motor and a control strategy executed by the control module, the generated discharge current wave is a single-phase sine wave, a positive and negative direct current wave or a trapezoidal wave.
4. The control method according to claim 1, wherein the control unit controls the release of the positive and negative high-frequency currents, including the following:
and the control unit executes a PID control strategy, an internal model control strategy or an asymmetric trapezoidal wave control strategy to release the positive and negative high-frequency currents.
5. An active discharge control system, comprising:
the device comprises a modulation module, an inverter, a multi-phase motor and a control unit for active discharge control;
the control unit includes:
the signal receiving subunit is used for detecting the lower electric signal by the control unit;
the current acquisition subunit is used for acquiring real-time current output by the multi-phase motor by adopting a current sensor, wherein the real-time current is any phase current of the multi-phase motor under a non-open circuit two-phase condition;
the high-frequency current subunit is used for calculating positive and negative high-frequency current driving signals matched with the real-time current according to the real-time current, and the positive and negative high-frequency current driving signals are used for generating positive and negative high-frequency currents; the positive and negative high-frequency currents are set to generate winding loss after being input into the multi-phase motor and output equivalent zero moment;
and the execution subunit is used for controlling the control unit to release the positive and negative high-frequency currents so as to be output to the multi-phase motor through the modulation module and the inverter for discharging.
6. The active discharge control system of claim 5 further comprising:
the temperature control subunit is used for acquiring the temperature of the lower winding of each phase of the multi-phase motor by adopting a temperature sensor; and when the winding temperature of any phase circuit exceeds a threshold value, marking that the phase circuit is in an open circuit state, and marking that other phase circuits are in a non-open circuit state.
7. The active discharge control system of claim 5 comprising the following:
and the execution subunit executes a PID control strategy, an internal model control strategy or an asymmetric trapezoidal wave control strategy to release the positive and negative high-frequency currents.
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