CN112202388B - Multistage series H bridge power unit protection device of high-voltage frequency converter - Google Patents
Multistage series H bridge power unit protection device of high-voltage frequency converter Download PDFInfo
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- CN112202388B CN112202388B CN202011034078.7A CN202011034078A CN112202388B CN 112202388 B CN112202388 B CN 112202388B CN 202011034078 A CN202011034078 A CN 202011034078A CN 112202388 B CN112202388 B CN 112202388B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/02—Providing protection against overload without automatic interruption of supply
- H02P29/024—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load
- H02P29/0241—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load the fault being an overvoltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/02—Providing protection against overload without automatic interruption of supply
- H02P29/024—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load
- H02P29/027—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load the fault being an over-current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P7/00—Arrangements for regulating or controlling the speed or torque of electric DC motors
- H02P7/06—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current
- H02P7/18—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power
- H02P7/24—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices
- H02P7/28—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a protection device for a multistage serial H-bridge power unit of a high-voltage frequency converter, which relates to the field of high-voltage frequency converters, the current detection module of the device obtains the output current value generated by three-phase current and sends the output current value to the differentiator to calculate the current differential quantity, when the output current value reaches the preset threshold value, the current differential quantity is output to the modulation calculation module to adjust the output voltage, the drop rate of the regulated voltage is the absolute value of the current differential quantity to generate the regulated voltage, the modulation calculation module can then control the switch state in the multi-stage series H-bridge power unit, thereby the current of the motor continues to flow, the torque keeps constant, and simultaneously the purpose of limiting the current of the motor is achieved, therefore, the power unit is protected, the power device is prevented from being burnt due to instantaneous overcurrent or overvoltage, the motor can overcome the moment loaded torque and stably run, and the safety and the reliability are improved.
Description
Technical Field
The invention relates to the field of high-voltage frequency converters, in particular to a protection device for a multistage serial H-bridge power unit of a high-voltage frequency converter.
Background
The multi-stage series H-bridge power unit is a typical dc motor control circuit, and is widely used in various fields, such as a high-voltage inverter. However, due to the structural particularity of the power unit, the multi-stage series H-bridge power unit is easily burnt due to instantaneous overcurrent or overvoltage during operation, and the safety and the reliability are low.
Disclosure of Invention
The invention provides a protection device for a multistage serial H-bridge power unit of a high-voltage frequency converter aiming at the problems and the technical requirements, and the technical scheme of the invention is as follows:
a high-voltage frequency converter multi-stage series H-bridge power unit protection device comprises a current detection module, a differentiator, a multi-stage hysteresis comparator, a modulation calculation module and a switch state modulator;
the current detection module acquires three-phase current of a multi-stage series H-bridge power unit of the high-voltage frequency converter and calculates an output current value according to the three-phase current, the output current value is input into a differentiator to obtain corresponding current differential quantity, the output current value is also input into a multi-stage hysteresis comparator to be compared with a preset threshold value, the multi-stage hysteresis comparator outputs high level when the output current value reaches the preset threshold value, otherwise, low level is output, and an output signal of the multi-stage hysteresis comparator is transmitted to the switch state modulator;
the differentiator outputs to the modulation calculation module through a driving switch controlled by the multistage hysteresis comparator, and the driving switch is closed when an output signal of the multistage hysteresis comparator is at a high level, or is opened when the output signal of the multistage hysteresis comparator is at a high level;
the modulation calculation module acquires the output voltage of the high-voltage frequency converter, adjusts the output voltage according to the acquired current differential quantity to generate an adjusted voltage, and the reduction rate of the adjusted voltage is the absolute value of the current differential quantity;
the modulation calculation module outputs the adjustment voltage to the switch state modulator, and the switch state modulator controls the switch state of the multi-stage series H-bridge power unit according to the output signal of the multi-stage hysteresis comparator and the adjustment voltage.
The further technical scheme is that the switch state modulator also obtains three-phase current of the multi-stage series H-bridge power unit;
controlling the switch state of the multi-stage series H-bridge power unit according to the output signal of the multi-stage hysteresis comparator and the adjustment voltage, comprising:
and when the output signal of the multistage hysteresis comparator is detected to be high level and the amplitude of the adjustment voltage is the same as that of the output voltage, determining the current direction according to the obtained three-phase current, and controlling the on-off of the switches of the upper bridge arm and the lower bridge arm in the multistage series H-bridge power unit according to the current direction.
The further technical scheme is that when the current direction is in-flow, the lower bridge arm is controlled to be conducted; and when the current flows out in the direction, the upper bridge arm is controlled to be conducted.
The further technical scheme is that the method for controlling the switch state in the multistage series H bridge power unit according to the output signal of the multistage hysteresis comparator and the adjustment voltage comprises the following steps:
and when the output signal of the multistage hysteresis comparator is detected to be high level and the amplitude of the adjusting voltage is different from that of the output voltage, controlling the conduction duration of the switch in the multistage series H-bridge power unit according to the adjusting voltage.
The further technical scheme is that the adjusting voltage is in direct proportion to the conduction time of the switch.
The further technical scheme is that the modulation calculation module also generates and outputs a synchronous signal to the switch state modulator, and the switch state modulator keeps synchronous with the modulation calculation module according to the synchronous signal.
The modulation calculation module comprises a voltage modulation ratio calculator, a multiplier and a PWM calculator, wherein the voltage modulation ratio calculator acquires the output voltage of the high-voltage frequency converter and calculates to obtain the amplitude of the output voltage to output to the multiplier and the PWM calculator, the differentiator outputs to the multiplier through a drive switch, the multiplier multiplies the amplitude of the output voltage and the current differential and outputs the multiplication result to the PWM calculator, and the PWM calculator determines that the adjustment voltage is V0-|Ki|*V0In which V is0Is the amplitude of the output voltage, KiIs the current differential.
The beneficial technical effects of the invention are as follows:
the application discloses multistage series connection H bridge power unit protection device of high-voltage inverter, the device utilizes current detection module and differentiator to calculate the current differential quantity, utilize the natural sampling mode of modulation calculation module to confirm the adjustment voltage according to the current differential quantity, then combine the control of on-off state modulator to the switch revolving stage, make motor current afterflow, the torque keeps certain, the mesh of restriction motor current has been reached simultaneously, thereby protect the power unit, prevent that power device from burning out because of overflowing or excessive pressure in the twinkling of an eye, make the motor can overcome loaded torque in the twinkling of an eye and steady operation, improve security and reliability.
Drawings
Fig. 1 is a schematic structural diagram of a multi-stage series H-bridge power unit protection device of a high-voltage inverter disclosed in the present application.
Detailed Description
The following further describes the embodiments of the present invention with reference to the drawings.
The application discloses high-voltage inverter multistage series H bridge power unit protection device please refer to fig. 1, and the device includes current detection module, differentiator, multistage hysteresis comparator, modulation calculation module and on-off state modulator, wherein current detection module can adopt current detection circuit, differentiator, multistage hysteresis comparator, modulation calculation module and on-off state modulator can be realized by FPGA in unison.
The current detection module obtains U, V, W-phase three-phase current I of a multi-stage series H-bridge power unit of a high-voltage frequency converterU、IV、IWAnd calculating to obtain an output current value according to the three-phase current. The output current value is input into a differentiator to obtain a corresponding current differential KiThe current differential KiI.e. the rate of change of the output current value. The output current value is also input into a multi-stage hysteresis comparator to be compared with a preset threshold value, the multi-stage hysteresis comparator outputs a high level when the output current value reaches the preset threshold value, otherwise, the multi-stage hysteresis comparator outputs a low level, and an output signal Fe of the multi-stage hysteresis comparator is transmitted to the switch state modulator.
The differentiator outputs to the modulation calculation module through a driving switch SW controlled by the multi-stage hysteresis comparator, the driving switch SW is switched on when the output signal of the multi-stage hysteresis comparator is high level, or is switched off when the output signal of the multi-stage hysteresis comparator is high level, namely when the output current value exceeds a preset threshold value, the current differential KiAnd outputting the signal to a modulation calculation module, otherwise, not outputting the signal to the modulation calculation module.
Modulation calculation module for obtaining output voltage V of high-voltage frequency converteroutAnd according to the obtained current differential KiRegulating the output voltage to generate an adjustment voltage Vt whose rate of decrease is a current differential KiThe absolute values of the values (A) and (B) are the same and have opposite positive and negative polarities.
The modulation calculation module outputs the adjustment voltage Vt to the switch state modulator, and the switch state modulator controls the switch state of the multistage series H-bridge power unit according to the output signal Fe of the multistage hysteresis comparator and the adjustment voltage Vt.
Specifically, the protection function of the device of the present application mainly works when the output current value reaches a predetermined threshold value, and the present application only exemplifies such a situation, and mainly has two main control situations:
(1) output ofThe current value reaches a predetermined threshold value, and Ki＝0。
At this time, the switch state modulator detects that the output signal Fe of the multi-stage hysteresis comparator is high level and adjusts the amplitude of the voltage Vt and the output voltage VoutAmplitude V of0Similarly, the switching state modulator will obtain U, V, W phase three-phase current I at the same timeU、IV、IWThe current direction can be determined to be inflow or outflow according to the three-phase current, so that the on-off of the switches of the upper and lower bridge arms in the multi-stage series H-bridge power unit is controlled according to the current direction, the phase sequence of the follow current of the motor is switched to be maintained, the torque of the motor is constant, and the purpose of limiting the current of the motor is achieved. Specifically, when the current direction is in-flow, the lower bridge arm is controlled to be conducted; and when the current flows out in the direction, the upper bridge arm is controlled to be conducted.
(2) The output current value reaches a predetermined threshold value, and KiNot equal to 0, specifically comprising Ki> 0 and Ki< 0 in both cases.
At this time, the switch state modulator detects that the output signal Fe of the multi-stage hysteresis comparator is high level and adjusts the amplitude of the voltage Vt and the output voltage VoutAmplitude V of0And if the output current is not within the preset range, the switch state modulator controls the on-time of the switch in the multistage series H-bridge power unit according to the adjustment voltage, and the adjustment voltage is in direct proportion to the on-time of the switch, namely the output voltage is reduced according to the rising rate of the output current, and then the on-time of the switch is adjusted so as to reduce the output current value and achieve the purpose of limiting the motor current.
Optionally, in this application, the modulation calculation module further generates and outputs a synchronization signal Fc to the switching state modulator, and the switching state modulator keeps synchronization with the modulation calculation module according to the synchronization signal Fc.
A specific structure of a modulation calculation module in the present application is shown in fig. 1, the modulation calculation module includes a voltage modulation ratio calculator, a multiplier and a PWM calculator, and the voltage modulation ratio calculator obtains an output voltage V of a high-voltage frequency converteroutAnd calculating to obtain the output voltage amplitude V0The output is sent to a multiplier and a PWM calculator, and a differentiator is driven by a driverThe dynamic switch SW is output to a multiplier, and the multiplier outputs a voltage amplitude V0Differential with current KiPerforming multiplication operation and multiplying the result Ki*V0And outputting the output to a PWM calculator. When K isiWhen the voltage is larger than 0, the PWM calculator determines that the adjusting voltage Vt is V0-Ki*V0When K isi< 0, the PWM calculator determines the adjustment voltage Vt to be V0+Ki*V0Uniformly, it can be expressed that the PWM calculator determines the adjustment voltage Vt as V0-|Ki|*V0。
What has been described above is only a preferred embodiment of the present application, and the present invention is not limited to the above embodiment. It is to be understood that other modifications and variations directly derivable or suggested by those skilled in the art without departing from the spirit and concept of the present invention are to be considered as included within the scope of the present invention.
Claims (7)
1. A high-voltage frequency converter multi-stage series H-bridge power unit protection device is characterized by comprising a current detection module, a differentiator, a multi-stage hysteresis comparator, a modulation calculation module and a switch state modulator;
the current detection module acquires three-phase current of a multi-stage series H-bridge power unit of the high-voltage frequency converter and calculates an output current value according to the three-phase current, the output current value is input into a differentiator to obtain corresponding current differential quantity, the output current value is also input into the multi-stage hysteresis comparator to be compared with a preset threshold value, the multi-stage hysteresis comparator outputs high level when the output current value reaches the preset threshold value, otherwise, low level is output, and an output signal of the multi-stage hysteresis comparator is transmitted to the switch state modulator;
the differentiator is output to the modulation calculation module through a driving switch controlled by the multistage hysteresis comparator, and the driving switch is switched on when an output signal of the multistage hysteresis comparator is at a high level, or switched off when the output signal of the multistage hysteresis comparator is at a low level;
the modulation calculation module acquires the output voltage of the high-voltage frequency converter, and adjusts the output voltage according to the acquired current differential to generate an adjusted voltage, wherein the reduction rate of the adjusted voltage is the absolute value of the current differential;
the modulation calculation module outputs the adjustment voltage to the switch state modulator, and the switch state modulator controls the switch state of the multi-stage series H-bridge power unit according to the output signal of the multi-stage hysteresis comparator and the adjustment voltage.
2. The protection device of the high-voltage inverter multistage series H-bridge power unit as claimed in claim 1, wherein the switch state modulator further obtains three-phase current of the multistage series H-bridge power unit;
the controlling the switch state in the multi-stage series H-bridge power unit according to the output signal of the multi-stage hysteresis comparator and the adjustment voltage includes:
and when the output signal of the multistage hysteresis comparator is detected to be high level and the amplitude of the adjustment voltage is the same as that of the output voltage, determining the current direction according to the obtained three-phase current, and controlling the on-off of the switches of the upper and lower bridge arms in the multistage series H-bridge power unit according to the current direction.
3. The protection device for the multistage series H-bridge power unit of the high-voltage frequency converter is characterized in that when the current direction is in-flow, the lower bridge arm is controlled to be conducted; and when the current flows out in the direction, the upper bridge arm is controlled to be conducted.
4. The protection device for the multilevel serial H-bridge power unit of the high-voltage inverter of claim 1, wherein the controlling the switch state in the multilevel serial H-bridge power unit according to the output signal of the multilevel hysteresis comparator and the adjustment voltage comprises:
and when the output signal of the multistage hysteresis comparator is detected to be high level and the amplitude of the adjusting voltage is different from that of the output voltage, controlling the conduction duration of a switch in the multistage series H-bridge power unit according to the adjusting voltage.
5. The H-bridge power unit protection device of claim 4, wherein the regulated voltage is proportional to the on-time of the switch.
6. The protection device for the H-bridge power unit with multi-level serial connection of the high-voltage inverter as claimed in any one of claims 1 to 5, wherein the modulation calculation module further generates and outputs a synchronization signal to the switch state modulator, and the switch state modulator keeps synchronization with the modulation calculation module according to the synchronization signal.
7. The H-bridge power unit protection device of any one of claims 1 to 5, wherein the modulation calculation module comprises a voltage modulation ratio calculator, a multiplier and a PWM calculator, the voltage modulation ratio calculator obtains the output voltage of the high-voltage frequency converter and calculates the amplitude of the output voltage to output to the multiplier and the PWM calculator, the differentiator outputs to the multiplier through the driving switch, the multiplier multiplies the amplitude of the output voltage and the current differential and outputs the multiplied result to the PWM calculator, and the PWM calculator determines that the regulated voltage is V0-|Ki|*V0In which V is0Is the output voltage amplitude, KiIs the current differential.
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| CN202011034078.7A CN112202388B (en) | 2020-09-27 | 2020-09-27 | Multistage series H bridge power unit protection device of high-voltage frequency converter |
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| JP6017822B2 (en) * | 2012-04-23 | 2016-11-02 | ローム株式会社 | Overcurrent protection circuit, load drive device, optical disk device, car audio equipment |
| WO2017008373A1 (en) * | 2015-07-14 | 2017-01-19 | 睿能机电有限公司 | Power supply device of electric tool |
| CN106374474A (en) * | 2015-07-23 | 2017-02-01 | 利思电气（上海）有限公司 | High-voltage active filtering apparatus for inhibiting three-phase imbalance |
| CN106374812A (en) * | 2016-11-09 | 2017-02-01 | 中车大连电力牵引研发中心有限公司 | Electric motor protection device |
| CN108599111A (en) * | 2018-06-14 | 2018-09-28 | 谢红普 | A kind of electric machine controller and its current foldback circuit |
| CN108988711B (en) * | 2018-07-20 | 2019-11-29 | 吉林大学 | A kind of motor control method of the electronic bridge plug delivery tool in oil field |
| CN209016697U (en) * | 2018-09-30 | 2019-06-21 | 浙江鲲悟科技有限公司 | The current foldback circuit of power conversion system and power switch tube |
| CN109600031B (en) * | 2018-12-25 | 2020-04-10 | 南京浦马电力电子有限公司 | Method for inhibiting starting impact current of three-phase active rectifying circuit |
| CN110768608A (en) * | 2019-11-12 | 2020-02-07 | 上海元城汽车技术有限公司 | Overcurrent protection device and electric automobile |
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