CN109936316B

CN109936316B - Control device for power converter

Info

Publication number: CN109936316B
Application number: CN201811503465.3A
Authority: CN
Inventors: 吉冈伸晃; 秋田健一; 田畑充规
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2017-12-15
Filing date: 2018-12-10
Publication date: 2022-06-03
Anticipated expiration: 2038-12-10
Also published as: JP2019110623A; JP6403863B1; FR3076964A1; FR3076964B1; CN109936316A

Abstract

The invention provides a control device which can prevent a battery mounted on a vehicle from reaching an overvoltage condition according to a generated current generated when a field winding type rotor with a magnet is in a non-excited state and rotates at a high speed, and can limit efficiency reduction of power generation and driving operations to a minimum. When the rotor is in a non-excited state, the generated current value of the rotating electric machine is compared with a current threshold value, when the generated current value is equal to or greater than the generated threshold value, both the first armature winding and the second armature winding are multi-phase short-circuited, when the generated current value is smaller than the current threshold value and greater than 0, either one of the first armature winding and the second armature winding is multi-phase short-circuited, and when the generated current value does not flow, the first armature winding and the second armature winding are returned from the multi-phase short-circuited state to a normal state.

Description

Control device for power converter

Technical Field

The present invention relates to a control device for a power converter incorporated in a generator motor that operates as a motor at the time of engine start and torque assist and operates as a generator after the engine start.

Background

A control device of a power converter built in the generator motor is connected between the rotating electric machine, the battery, and the vehicle electric load. The control device of the power converter rectifies the ac power output from the rotating electric machine to convert the ac power into dc power, and supplies the dc power thus converted to the battery and the vehicle electrical load.

In recent years, there has been a demand for increasing the output current during power generation and the output torque during driving. As a technique capable of meeting such a demand, a rotating electrical machine has been proposed in which a permanent magnet is provided between claw-shaped magnetic pole pieces in a so-called lundell-type rotor that has been conventionally used in a commercial vehicle (see, for example, patent document 1).

When there is a sudden Load fluctuation such as a separation of a cable connecting the generator motor and the battery during power generation, the generated power may temporarily become excessive, and a Load Dump Surge (Load Dump) corresponding to a high voltage may be generated at the input/output terminal portion of the generator motor. In order to suppress such a load dump surge, a method has been proposed in which all the switching elements of the negative-side arm or the positive-side arm of the bridge circuit are turned on to short-circuit the armature winding (see, for example, patent document 2).

In the case of using a field winding type rotor with a magnet, eddy currents are generated in the permanent magnets by using the vicinity of the stator magnetized by the back electromotive force generated at the time of short-circuiting the permanent magnets provided in the rotor. As a result, the permanent magnet may generate heat and be demagnetized. As a countermeasure against this, a method has been proposed in which the first armature winding and the second armature winding are short-circuited simultaneously or in multiple stages in multiple phases depending on the rotation speed at the time of overvoltage generation, thereby reducing heat generation (see, for example, patent document 3).

Documents of the prior art

Patent document

Patent document 1: japanese patent No. 2548882

Patent document 2: japanese patent No. 3840880

Patent document 3: japanese patent No. 6180601

Disclosure of Invention

Technical problem to be solved by the invention

However, the following problems exist in the prior art.

In the conventional methods described in patent documents 1 to 3, it is impossible to detect an overvoltage phenomenon other than a load surge before a battery voltage mounted on a vehicle becomes abnormal. For example, it is conceivable to use an armature power converter having a simple structure that cannot perform field weakening control for a generated current generated when a field winding type rotor with a magnet is in a non-excited state and is rotating at a high speed.

As one example, an armature power converter that performs energization control using a rectangular wave is given. Such a conventional armature power converter cannot cancel the induced voltage generated by the armature. Therefore, the conventional armature power converter flows the generated current, and as a result, cannot handle the overvoltage of the battery.

Further, none of patent documents 1 to 3 intends to take measures for recovery from an overvoltage state. Therefore, if the multiphase short-circuit state is kept unchanged in patent documents 1 to 3, the switching element and the armature winding generate heat. As a result, the efficiency may be lowered during the subsequent power generation and driving.

The present invention has been made to solve the above-described problems, and provides a control device for a power converter, which can prevent a battery mounted on a vehicle from becoming overvoltage when a field winding type rotor with a magnet is in a non-excited state and is rotating at a high speed, and can suppress a decrease in driving and power generation efficiency due to subsequent heat generation.

Technical scheme for solving technical problem

A control device for a power converter according to the present invention is a control device for a power converter including a controller for controlling a power converter that converts ac power output from a rotating electrical machine to dc power and supplies the dc power to a battery, wherein the rotating electrical machine includes an armature having a first armature winding and a second armature winding, and a field winding type rotor having a magnet, the controller compares a generated current value of the rotating electrical machine with a current threshold value set in advance for detecting a high-speed rotation of the rotating electrical machine when the rotor is in a non-excited state, short-circuits both the first armature winding and the second armature winding in a plurality of phases when the generated current value is equal to or greater than the generated threshold value, and short-circuits either one of the first armature winding and the second armature winding in a plurality of phases when the generated current value is smaller than the current threshold value and larger than 0, when the generated current value does not flow, the first armature winding and the second armature winding are restored from the multiphase short-circuit state to the normal state.

A control device for a power converter according to the present invention is a control device for a power converter including a controller for controlling a power converter for converting ac power output from a rotating electrical machine into dc power and supplying the dc power to a battery, wherein the rotating electrical machine includes an armature having a first armature winding and a second armature winding, and a rotor of a field winding type having a magnet, the controller acquires detection results of three-phase voltages of the first armature winding and three-phase voltages of the second armature winding in a non-excited state of the rotor, calculates a maximum value of one of the three-phase voltages of the first armature winding and the three-phase voltages of the second armature winding within a time range set to a time period of 1 cycle or more of an electrical angle of the three-phase voltages, and when the maximum value is equal to or more than a preset short-circuit determination value, one armature winding is short-circuited in multiple phases, the maximum value of the three-phase voltage of the other armature winding is calculated in a state where the one armature winding is short-circuited in multiple phases, when the maximum value is equal to or more than a preset short-circuit judgment value, the other armature winding is also short-circuited in multiple phases, when one armature winding is in a multi-phase short circuit state, the peak value of the phase voltage is judged by setting the negative side bridge arm of any phase of the one armature winding to be in a cut-off state, when the peak value becomes smaller than the short-circuit determination value, one armature winding is restored from the multiphase short-circuit state to the normal state, when the other armature winding is in a multi-phase short circuit state, the peak value of the phase voltage is determined by setting the negative side bridge arm of any phase of the other armature winding to be in a cut-off state, when the peak value becomes smaller than the short-circuit determination value, the other armature winding is returned from the multiphase short-circuit state to the normal state.

Effects of the invention

According to the invention, the structure comprises the following structures: the overvoltage of the battery is prevented by taking a measure for performing a multi-phase short circuit promptly based on the detection result of the generated current, and the battery is returned to a normal state when the measure is not required. As a result, when the field winding type rotor with a magnet is in a non-excited state and is rotating at a high speed, it is possible to prevent the battery mounted on the vehicle from reaching an overvoltage, and it is also possible to minimize a decrease in efficiency of the subsequent power generation and driving operations.

Drawings

Fig. 1 is an explanatory diagram showing a vehicle system in which a generator-motor according to embodiment 1 of the present invention is mounted, and a configuration of the generator-motor.

Fig. 2 is an external view of a rotor incorporated in a rotating electric machine according to embodiment 1 of the present invention.

Fig. 3 is a diagram showing an internal configuration of a generator motor according to embodiment 1 of the present invention.

Fig. 4 is a diagram showing an internal configuration of a control device in embodiment 1 of the present invention.

Fig. 5 is a diagram showing a generated current estimation value map used in the estimation process performed by the generated current estimation unit in embodiment 1 of the present invention.

Fig. 6 is an explanatory diagram showing a series of control methods of multiphase short circuit control in embodiment 1 of the present invention.

Fig. 7 is a diagram showing an internal configuration of a control device in embodiment 2 of the present invention.

Fig. 8 is a diagram showing an example of phase voltage peak detection in the power generation state determination unit according to embodiment 2 of the present invention.

Fig. 9 is a flowchart showing a series of processes executed by the power generation state determination unit according to embodiment 2 of the present invention.

Detailed Description

Hereinafter, preferred embodiments of a control device for a power converter according to the present invention will be described with reference to the drawings.

Embodiment 1-

Fig. 1 is an explanatory diagram showing a configuration of a vehicle system in which a generator-motor according to embodiment 1 of the present invention is mounted, and the generator-motor. In fig. 1, a generator motor 1 is connected to an internal combustion engine 3 via a power transmission unit 4 such as a belt. The generator motor 1 includes a B terminal as a high-potential-side input/output terminal and an E terminal as a low-potential-side input/output terminal. The B terminal is connected to the + side terminal of the battery 2, and the E terminal is connected to the-side terminal of the battery 2.

The generator motor 1 is composed of a power converter 11 and a rotating electrical machine 12. The power converter 11 includes: an excitation power conversion unit 112; an armature power conversion unit 113; a control device 111 corresponding to a controller for controlling the power conversion units; an excitation current sensor 114 for detecting an excitation current; a B-terminal voltage sensor 115 for detecting a voltage of the B-terminal; and a B-terminal current detection sensor for detecting a current flowing through the B-terminal.

The rotating electrical machine 12 includes a field winding 121 that generates a field magnetic flux by supplying a field current, two sets of

armature windings

122 and 123, and a position sensor 124. Further, as the position sensor 124, a hall sensor, a rotation sensor, or the like is generally used.

Next, the outer shape of the rotor incorporated in the rotating electric machine 12 will be described. Fig. 2 is an external view of a rotor incorporated in a rotating electric machine 12 according to embodiment 1 of the present invention.

The rotor shown in fig. 2 includes a rotor core having a plurality of positive-side claw-shaped magnetic pole pieces 201 and negative-side claw-shaped magnetic pole pieces 202 provided on the outer periphery thereof, and a permanent magnet 203. The rotor core is wound with a field winding 121. The permanent magnet 203 is magnetized in a direction to reduce leakage magnetic flux between the adjacent positive-side claw-shaped magnetic pole piece 201 and negative-side claw-shaped magnetic pole piece 202. In the rotating electrical machine 12, when the field winding 121 generates the field magnetic flux, the rotor is rotated to generate an induced voltage in the armature winding, thereby generating electric power.

The excitation power conversion unit 112 operates in accordance with an on/off command of the switching element from the control device 111. The control device 111 controls the switching elements of the excitation power conversion unit 112 by performing PWM control, and causes the excitation current to flow through the excitation winding 121. A half-bridge circuit of MOSFETs is generally used for the excitation power converting portion 112.

The armature power converting unit 113 operates in accordance with a gate signal from the control device 111. The armature power converting unit 113 rectifies an armature current flowing through the armature winding 122 and the armature winding 123 to generate electric power. The generated power is provided to the battery and other vehicle electrical loads.

Fig. 3 is a diagram showing an internal configuration of the generator motor 1 according to embodiment 1 of the present invention. The armature power converting portion 113 includes a total of two circuits according to the structure of the armature winding: a three-phase bridge circuit formed by branches 301-303 corresponding to three phases of U-phase, V-phase and W-phase; and a three-phase bridge circuit formed by branches 304-306 corresponding to three phases of X phase, Y phase and Z phase.

The armature power converter 113 includes MOSFETs of UH301a, VH302a, and WH303a as the positive side arm of the armature winding 122, and MOSFETs of UL301b, VL302b, and WL303b as the negative side arm of the armature winding 122. Similarly, the armature power conversion unit 113 includes MOSFETs XH304a, YH305a, ZH306a as a positive side bridge arm of the armature winding 123, and MOSFETs XL304b, YL305b, ZL306b as a negative side bridge arm of the armature winding 123.

These MOSFETs are turned on/off according to a gate signal from the control device 111. Since the circuit configuration and the power generation method are known per se, a more detailed description thereof will be omitted.

Next, the operation of the generated current detection in embodiment 1 will be described in detail with reference to fig. 4 to 6. Fig. 4 is a diagram showing an internal configuration of the control device 111 in embodiment 1 of the present invention.

The controller 111 shown in fig. 4 includes a B-terminal voltage detection unit 401, a rotation speed detection unit 402, an excitation current detection unit 403, a generated current estimation unit 404, a generated current threshold determination unit 405, a negative-side arm short-circuit control unit 406, and a gate driver 407.

The B-terminal voltage detection unit 401 detects the B-terminal voltage V_B. The rotation speed detector 402 detects the rotation speed N. Exciting current detection unit 403 detects exciting current I_F. When the field winding 121 is in a non-excited state and the rotor rotates at a high speed, the generated current estimating unit 404 estimates the generated current based on the B-terminal voltage V_BSpeed N, exciting current I_FTo estimate the generated current value I_GEN。

Fig. 5 is a diagram showing a generated current estimation value map used in the estimation process performed by the generated current estimation unit 404 in embodiment 1 of the present invention. In the example shown in FIG. 5, the voltage is shown for a plurality of B terminalsV_B＝V₁、V₂、V₃And … …, respectively, the relationship between the specified value of the generated current and the rotation speed is mapped. When such a map is provided, the generated current estimating unit 404 can estimate the generated current based on the B-terminal voltage V_BAnd the estimated value of the generated current is obtained by referring to the map.

Subsequently, the generated current estimate threshold determination unit 405 determines the generated current value I_GENIs a preset threshold value I_THAbove or below I_THAnd at the generated current value I_GENIs less than I_THIn the case of (1), it is judged whether or not a current flows (I)_GEN0). The generated current estimate threshold value determination unit 405 determines that the current is I_TH≤I_GENIn the case of (3), the negative-side arm short-circuit controller 406 inputs to the gate driver 407 commands for turning on all of the MOSFETs of the negative-side arms of the armature winding 122 and the armature winding 123, i.e., UL301b, VL302b, WL303b, XL304b, YL305b, and ZL306 b.

Then, the generated current estimate threshold value determination unit 405 determines that 0 < I_GEN＜I_THIn the case of (3), the negative-side arm short-circuit controller 406 inputs to the gate driver 407 a command for turning on only one of the MOSFETs UL301b, VL302b, and WL303b of the negative-side arm of the armature winding 122 and the MOSFETs XL304b, YL305b, and ZL306b of the negative-side arm of the armature winding 123.

Fig. 6 is an explanatory diagram showing a series of control methods of multiphase short circuit control in embodiment 1 of the present invention. Fig. 6(a) shows a temporal change in the rotation speed N, fig. 6(b) shows a temporal change in the estimated generated current value, and fig. 6(c) shows an on (short-circuited) state and an off (released) state of the MOSFETs of the negative-side arm of the armature winding 122 and the armature winding 123. In FIG. 6, at 0 < I_GEN＜I_THThe case of (3) is exemplified by a case of short-circuiting the MSFETs of the negative side arm of the armature winding 122.

Then, the generated current estimate threshold value determination unit 405 determines that the current is I_GENWhen the voltage is 0 (no power generation), the negative-side arm short-circuit control unit 406 causes the armature winding 122 and the armature to rotateCommands for turning off all of the MOSFETs of the negative-side arms of the winding 123, i.e., UL301b, VL302b, WL303b, XL304b, YL305b, and ZL306b are input to the gate driver 407.

The gate driver 407 amplifies the command received from the negative-side arm short-circuit control unit 406 to output a gate signal as a gate signal, thereby driving the MOSFET408 to be turned on and off.

When the armature winding 122 and the armature winding 123 are short-circuited in multiple phases, the actual generated current decreases. However, the generated current estimation unit 404 obtains the estimated generated current value by referring to a map generated based on the output value at the time of normal power generation. Therefore, there is no case where the multi-phase short circuit is cancelled because the MOSFET of the negative-side arm is unintentionally turned off due to a decrease in the generated current at the time of the multi-phase short circuit. Here, as an example of a case where the generated current is decreased in the case of the multi-phase short circuit, a case where the generated current is 0 while one armature winding is multi-phase short-circuited is given.

As described above, according to embodiment 1, the following configuration is provided: even if the field winding is in a non-excited state, when the generated current flows due to high-speed rotation, a multi-phase short circuit is performed before the battery reaches an overvoltage state. Therefore, the battery can be prevented from reaching an overvoltage.

When the MOSFETs of the negative arm are short-circuited in multiple phases, a return current is generated between the armature winding and the MOSFETs of the negative arm by the magnetic flux generated by the rotor, and thus the portions generate heat. In order to address such a problem, embodiment 1 includes the following configuration: based on the estimated amount of power generation, a multi-phase short circuit is performed in multiple stages, and the system is controlled to return to a normal state (the MOSFETs are all turned off) when power generation is not performed. As a result, the performance map improves the efficiency at the time of driving and power generation due to the reduction in heat generation.

Embodiment 2-

In embodiment 2, a specific example in which the generated current detection method and the control method at the time of detection are different from those in embodiment 1 will be described with reference to fig. 7.

Fig. 7 is a diagram showing an internal configuration of the control device 111 according to embodiment 2 of the present invention. The controller 111 shown in fig. 7 includes a B-terminal voltage detection unit 401, a negative-side arm short-circuit control unit 406, a gate driver 407, a phase voltage detection unit 701, and a power generation state determination unit 702.

The phase voltage detection unit 701 detects phase voltages between the midpoint of each of the legs 301 to 306 of the U-phase, V-phase, W-phase, X-phase, Y-phase, and Z-phase of the two three-phase bridge circuits and GND. Here, the midpoint is between the positive-side arm and the negative-side arm.

The power generation state determination unit 702 acquires the B-terminal voltage V detected by the B-terminal voltage detection unit 401_BAnd the phase voltages detected by the phase voltage detection unit 701. Next, a specific process of the power generation state determination unit 702 will be described with reference to fig. 8. Fig. 8 is a diagram showing an example of phase voltage peak detection by the power generation state determination unit 702 according to embodiment 2 of the present invention.

As shown in fig. 8, the power generation state determination unit 702 sets a predetermined time T at a constant cycle_{GET_PEAK}Peak value V of each phase voltage on the side of inner armature winding 122_{P_U}、V_{P_V}、V_{P_W}The maximum value in (1) is calculated as V_{P1_MAX}. Similarly, the power generation state determination unit 702 determines the time T corresponding to one cycle_{GET_PEAK}Peak value V of each phase voltage on the side of the inner armature winding 123_{P_X}、V_{P_Y}、V_{P_Z}The maximum value in (1) is calculated as V_{P2_MAX}。

The power generation state determination unit 702 determines the maximum value V based on the calculated value_{P1_MAX}And maximum value V_{P2_MAX}A multiphase short circuit pattern is generated. At this time, T_{GET_PEAK}At minimum, the electrical angle of the phase voltage must be set in advance for a period of 1 cycle or more.

Next, the determination and the operation flow of the power generation state determination unit 702 according to embodiment 2 will be described in detail. Fig. 9 is a flowchart showing a series of processes executed by the power generation state determination unit 702 according to embodiment 2 of the present invention. The flow shown in fig. 9 is roughly divided into a multiphase short determination processing flow, a multiphase short processing flow, and a recovery processing flow.

First, in step S911 and step S912 of the multiphase short circuit determination processing flow, the power generation state determination unit 702 checks whether or not the armature winding 122 and the armature winding 123 are in the multiphase short circuit. In the case where the armature winding 123 is in the multiphase short circuit, the power generation state determination section 702 executes the processing after step S931 in the restoration processing flow.

When the armature winding 123 is not short-circuited in multiple phases but the armature winding 122 is short-circuited in multiple phases, the power generation state determination unit 702 executes the processing after step S921 in the multi-phase short-circuit processing flow. In addition, when the armature winding 123 is not in the multiphase short circuit and the armature winding 122 is not in the multiphase short circuit, the power generation state determination unit 702 executes the processing after step S923 in the multiphase short circuit processing flow.

The case where the process proceeds to step S923 in the multiphase short-circuit processing flow corresponds to the case where neither the armature winding 122 nor the armature winding 123 is in the multiphase short-circuit. Therefore, in step S923, the power generation state determination unit 702 determines whether or not the condition of the following expression (1) is satisfied.

V_{P1_MAX}≥V_B+V_F[V] (1)

When the condition of the above expression (1) is satisfied, the power generation state determination unit 702 turns on the MOSFETs UL301b, VL302b, and WL303b of the negative side arm of the armature winding 122 to perform a multi-phase short circuit in step S924. After the multi-phase short circuit is performed, the power generation state determination unit 702 executes the processing after step S935 in the recovery processing flow.

On the other hand, when the condition of the above expression (1) is not satisfied, the power generation state determination unit 702 does not need the multiphase short circuit, and thus ends the series of processing. In addition, V at this time_FTypically a forward voltage when a forward bias is applied to the diode.

The case where the process proceeds to step S921 in the multiphase short-circuit processing flow corresponds to a state where only the armature winding 122 is short-circuited in the multiphase. Therefore, in step S921, the power generation state determination unit 702 determines whether or not the condition of the following expression (2) is satisfied.

V_{P2_MAX}≥V_B+V_F[V] (2)

When the condition of expression (2) is satisfied, the generated state determination unit 702 turns on the MOSFETs XL304b, YL305b, and ZL306b, which are the MOSFETs of the negative arm of the MOSFET of the armature winding 123, to perform the multiphase short circuit in step S922. After the multi-phase short circuit is performed, the power generation state determination unit 702 executes the processing after step S931 in the restoration processing flow.

In addition, at V_{P1_MAX}Satisfies the condition of the above formula (1) and V_{P2_MAX}When the condition of the above expression (2) is satisfied, the armature winding 122 is preferentially short-circuited in multiple phases as shown in fig. 9.

Finally, the case where the process proceeds to step S935 in the restoration process flow corresponds to the armature winding 122 being in a multi-phase short-circuited state. Therefore, in step S936, the generated state determination unit 702 turns off T the MOSFET of the negative side arm of any phase of the armature winding 122_{GET_PEAK}Time.

In step S937, the power generation state determination unit 702 determines whether or not the condition of the following expression (3) is satisfied.

V_{P1_MAX}＜V_B+V_F[V] (3)

Then, when the condition of the above expression (3) is satisfied, the power generation state determination unit 702 turns off the MOSFETs of the negative side arm of the armature winding 122, i.e., UL301b, VL302b, and WL303b, and releases the short circuit to end the series of processing in step S938.

On the other hand, when the condition of the above expression (3) is not satisfied, the power generation state determination unit 702 ends the series of processing without executing the processing of step S938.

The case where the process proceeds to step S931 in the recovery process flow corresponds to the case where both the armature winding 122 and the armature winding 123 are in the multiphase short-circuited state. Therefore, the generated state determination unit 702 first turns off T the MOSFET of the negative side arm of any one phase of the armature winding 123 in step S932_{GET_PEAK}Time.

In step S933, the power generation state determination unit 702 determines whether or not the condition of the following expression (4) is satisfied.

V_{P2_MAX}＜V_B+V_F[V] (4)

When the condition of expression (4) is satisfied, the generated state determination unit 702 turns off the MOSFETs XL304b, YL305b, and ZL306b as the negative arm of the armature winding 123 and releases the short circuit in step S934.

After that, the power generation state determination unit 702 executes the processing after step S935, which has been described above. That is, in step S936, the generated state determination unit 702 turns off T the MOSFET of the negative side arm of any phase of the armature winding 122_{GET_PEAK}Time.

When the condition of the above expression (3) is satisfied, the power generation state determination unit 702 turns off the MOSFETs of the negative side arm of the armature winding 122, i.e., UL301b, VL302b, and WL303b, and releases the short circuit to end the series of processing in step S938.

As an actual operation, when the multiphase short circuit of one armature winding is cancelled, the amplitude of the other phase voltage becomes large, and the peak value of the phase voltage increases. Therefore, the multiphase short circuit of the armature winding 122 and the armature winding 123 is not released at the same time.

The gate driver 407 drives the MOSFET408 to be turned on and off in accordance with the on command and the off command of each MOSFET received from the power generation state determination unit 702 based on a series of processes shown in fig. 9.

As described above, according to embodiment 2, as in embodiment 1, the following configuration is provided: even if the field winding is in a non-excited state, when the generated current flows due to high-speed rotation, a multi-phase short circuit is performed before the battery reaches an overvoltage state. Therefore, the same effects as those of embodiment 1 can be obtained.

Further, according to embodiment 2, the phase voltage detection unit may be configured using phase voltage detection sensors provided in a normal generator and generator motor. Thus, the capability map reduces the cost of the control device of the power converter. Further, according to embodiment 2, instead of executing the multiphase short-circuit control using the estimate value, the multiphase short-circuit control can be executed based on the estimate value of the sensor, thereby achieving high control accuracy.

Description of the reference symbols

1 Generator motor

2 batteries

3 internal combustion engine

4 power transmission unit

11 power converter

12 rotating electrical machine

111 control device

112 excitation power conversion unit

113 armature power conversion unit

114 field current sensor

115B terminal voltage sensor

121 field winding

122. 123 polyphase winding

124 position sensor

201 positive pole side claw pole piece

202 negative pole side claw-shaped magnetic pole piece

203 permanent magnet

Branch of 301-306 three-phase bridge circuit

301a to 306a positive side arm

301 b-306 b negative pole side bridge arm

401B terminal voltage detection unit

402 rotation speed detection unit

403 exciting current detecting part

404 generated current estimating unit

405 generated current estimate threshold determination unit

406 negative side bridge arm short circuit control part

407 gate driver

408 MOSFET

701 phase voltage detection unit

702 power generation state determination unit

Claims

1. A control apparatus of a power converter, comprising:

a controller for controlling a power converter for converting alternating current output from a rotating electrical machine into direct current and supplying the direct current to a battery, the rotating electrical machine including an armature having a first armature winding and a second armature winding, and a field winding type rotor with a magnet, the controller being characterized in that the controller is configured to control the power converter,

the controller performs the following operations:

comparing a generated current value of the rotating electrical machine with a current threshold value set in advance for detecting a state in which the rotating electrical machine is rotating at a high speed in a state in which the rotor is not excited,

short-circuiting both the first armature winding and the second armature winding in a plurality of phases when the generated current value is equal to or greater than the current threshold value,

short-circuiting any one of the first armature winding and the second armature winding in multiple phases when the generated current value is smaller than the current threshold value and larger than 0,

when the generated current value does not flow, the first armature winding and the second armature winding are restored from a multiphase short-circuit state to a normal state.

2. The control apparatus of a power converter according to claim 1,

the controller obtains a rotation speed of the rotor and a supply voltage value supplied to the battery, and estimates the generated current value from the rotation speed and the supply voltage value.

3. A control apparatus of a power converter, comprising:

the controller performs the following operations:

obtaining the detection results of the three-phase voltage of the first armature winding and the three-phase voltage of the second armature winding when the rotor is in a non-excitation state,

calculating a maximum value of a three-phase voltage of any one of the three-phase voltages of the first armature winding and the three-phase voltages of the second armature winding within a time range set to a time period of 1 cycle or more of an electrical angle of the three-phase voltages, and short-circuiting the one armature winding in multiple phases when the maximum value is equal to or more than a preset short-circuit determination value,

calculating a maximum value of three-phase voltages of the other armature winding in a state where the one armature winding is short-circuited in a plurality of phases, and further short-circuiting the other armature winding in a plurality of phases when the maximum value is equal to or greater than a preset short-circuit determination value,

determining a peak value of the phase voltage by setting a negative-side arm of any one of the phases of the one armature winding to an off state in a state where the one armature winding is short-circuited in multiple phases, and turning off the negative-side arms of all the phases of the one armature winding when the peak value becomes smaller than the short-circuit determination value,

when the other armature winding is in a multi-phase short circuit state, a peak value of the phase voltage is determined by setting the negative-side arm of any one of the phases of the other armature winding to an off state, and when the peak value becomes smaller than the short circuit determination value, the negative-side arms of all the phases of the other armature winding are set to an off state.