CN113364282B - Multi-path intelligent control circuit for high-voltage distribution box and control method thereof - Google Patents
Multi-path intelligent control circuit for high-voltage distribution box and control method thereof Download PDFInfo
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- CN113364282B CN113364282B CN202110445865.9A CN202110445865A CN113364282B CN 113364282 B CN113364282 B CN 113364282B CN 202110445865 A CN202110445865 A CN 202110445865A CN 113364282 B CN113364282 B CN 113364282B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
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Abstract
The invention provides a multi-path intelligent control circuit for a high-voltage distribution box and a control method thereof, which solve the technical problem of poor control reliability caused by substantial defects of the existing high-voltage distribution box electrical structure. The control circuit includes: the high-voltage loop is used for connecting a high-voltage power signal to the input side, forming a controlled pre-charging loop connected with the load end of the contactor in the power distribution branch circuit on the output side as required, and forming a power conversion circuit between the input side and the output side, and outputting a controlled pre-charging power signal to the gated controlled pre-charging loop; the circuit control module is used for controlling the formation of a gating signal to enable the controlled pre-charging loop, and forming a pulse width modulation wave regulating power conversion circuit to output a pre-charging power signal. The pre-charging power signal formed by using the PWM control mode has the technical advantages of flexible and adjustable pre-charging speed and voltage precision, realizes accurate switching of the power distribution branch circuit, and prolongs the service life of the main contactor. The highly integrated implementation employs a minimum of sensors to achieve complete voltage detection.
Description
Technical Field
The invention relates to the technical field of power supply control, in particular to a multi-path intelligent control circuit for a high-voltage distribution box and a control method thereof.
Background
In the prior art, the electric drive special vehicle is powered by a power unit consisting of a power battery with the 600VDC level and a diesel-generator, and the wheel drive motor is driven, so that the electric drive special vehicle has the characteristics of high reliability, high safety, quick maneuvering, good use, autonomous controllability and the like. The high-voltage distribution box is used as distribution equipment of high-voltage energy sources of the whole vehicle, supplies and distributes power for all high-voltage electric equipment of the whole vehicle, and realizes state monitoring, remote control, information communication and the like of a high-voltage distribution loop.
The electrical structure of the high-voltage distribution box in the prior art is shown in fig. 1. In fig. 1, the input end of the distribution box is connected with a power battery, the load end of the distribution box can be connected with a driving motor, a power unit, AC/DC, DC/DC and other equipment, and the interconnection end is used for cascading a plurality of high-voltage distribution boxes. The high-voltage distribution box is used for distributing power to all branches by a main contactor (such as KM 1), and in order to avoid the problem of overcurrent adhesion caused by switching on the contactor when the pressure difference between two ends of the contactor is overlarge, the two ends of the contactor are connected with a pre-charging branch in parallel, and the pre-charging branch consists of a low-power pre-charging contactor (such as KM 2) and a pre-charging resistor. The distribution process of the high-voltage distribution box to a certain branch is as follows: the pre-charging contactor is closed at first, at the moment, the pre-charging resistor is connected in series to the power distribution loop to charge the load and raise the load voltage, after a period of time, when the load voltage rises to be slightly different from the voltage of the direct current bus, the main contactor of the branch is connected, the pre-charging contactor of the branch is disconnected, and the power distribution of the branch is completed. The electrical structure of the existing distribution box has the following problems:
a pre-charging circuit consisting of a pre-charging resistor and a pre-charging contactor is required to be configured for each distribution branch, and the pre-charging circuit occupies a large volume and a large weight of the distribution box; in the pre-charging process, the charging speed is higher only in the charging starting stage, and the charging speed gradually decreases after the load voltage is raised, so that the whole pre-charging process is longer; when the load end has no voltage sensor, the voltage of the load end cannot be detected, whether the pre-charging is finished or not can only be roughly judged through the pre-charging time, if the load capacitance is larger, the pre-charging time is shorter, and the main contactor is still easy to adhere due to incomplete pre-charging; and when the load end is not provided with a voltage sensor, the on-off state of the main contactor can be judged only by the auxiliary contact of the main contactor, so that the size of the main contactor is increased, and the cost is increased.
Disclosure of Invention
In view of the above problems, the embodiments of the present invention provide a multi-path intelligent control circuit for a high-voltage distribution box and a control method thereof, which solve the technical problem of poor control reliability caused by substantial defects in the existing electrical structure of the high-voltage distribution box.
The multi-path intelligent control circuit for the high-voltage distribution box comprises:
the high-voltage loop is used for connecting a high-voltage power signal to the input side, forming a controlled pre-charging loop connected with the load end of the contactor in the power distribution branch circuit on the output side as required, and forming a power conversion circuit between the input side and the output side, and outputting a controlled pre-charging power signal to the gated controlled pre-charging loop;
the circuit control module is used for controlling the formation of a gating signal to enable the controlled pre-charge loop, forming a pulse width modulation wave to regulate the power conversion circuit to output the pre-charge power signal.
The multi-path intelligent control method for the high-voltage distribution box, which is provided by the embodiment of the invention, comprises the following steps of:
and the controlled forming gating signal enables the controlled pre-charging loop, and the pulse width modulation wave is formed to regulate the power conversion circuit to output the pre-charging power signal.
According to the multichannel intelligent control circuit and the control method for the high-voltage distribution box, disclosed by the embodiment of the invention, the auxiliary contacts of the pre-charging resistor, the pre-charging contactor and the main contactor are replaced by forming the power conversion circuit and the controlled pre-charging circuit, so that the optimization of the size space and the weight of the distribution box is realized, and the manufacturing cost is saved. The pre-charging power signal formed by using the PWM control mode has the technical advantages of flexible and adjustable pre-charging speed and voltage precision, can realize accurate switching between a pre-charging link and a closing link of the main contactor, and prolongs the service life of the main contactor. The high integration of the multi-path intelligent control circuit provides a circuit foundation for the judgment of voltage detection, on detection and adhesion detection by adopting the least professional sensors, so that the control circuit of the distribution box is further simplified.
Drawings
Fig. 1 is a schematic diagram of a prior art high voltage distribution box.
Fig. 2 is a schematic diagram of a multi-path intelligent control circuit for a high-voltage distribution box according to an embodiment of the invention.
Fig. 3 is a schematic diagram of a high-voltage circuit of a multi-path intelligent control circuit for a high-voltage distribution box according to an embodiment of the invention.
Fig. 4 is a flowchart illustrating a precharge control process in a multi-path intelligent control method deployed in a circuit control module of a multi-path intelligent control circuit for a high voltage distribution box according to an embodiment of the present invention.
Fig. 5 is a schematic diagram showing signal feedback-output of a dual closed-loop control strategy in the process of pre-charge control in a multi-channel intelligent control method for a high-voltage distribution box according to an embodiment of the present invention.
Fig. 6 is a flowchart illustrating a power distribution branch detection process in a multi-path intelligent control method for a high-voltage distribution box according to an embodiment of the present invention.
Fig. 7 is a flowchart illustrating a power-off control process of a power distribution branch in a multi-path intelligent control method for a high-voltage distribution box according to an embodiment of the present invention.
Detailed Description
The present invention will be further described with reference to the drawings and the detailed description below, in order to make the objects, technical solutions and advantages of the present invention more apparent. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The multi-path intelligent control circuit for the high-voltage distribution box according to one embodiment of the invention is shown in fig. 1. In fig. 1, the present embodiment includes:
the high-voltage loop is used for connecting a high-voltage power signal to the input side, forming a controlled pre-charging loop connected with the load end of the contactor in the power distribution branch on the output side as required, and forming a power conversion circuit between the input side and the output side, and outputting a controlled pre-charging power signal to the gated controlled pre-charging loop.
It will be appreciated by those skilled in the art that the high voltage circuit is identical to the other power supply circuits, with an electrical interface on the access side connecting the input positive and input negative and an electrical interface on the output side connecting the output positive and output negative. According to the embodiment of the invention, the input side is connected with the anode and the cathode of the direct current bus of the high-voltage distribution box, at least one controlled pre-charging loop on the output side can be formed according to the requirement, and each controlled pre-charging loop is connected to the load end of the main contactor in one path of distribution branch.
The circuit control module is used for controlling the formation of a gating signal to enable the controlled pre-charging loop, and forming a pulse width modulation wave regulating power conversion circuit to output a pre-charging power signal.
The controlled formation strobe signal may cause the corresponding controlled precharge circuit to communicate with the power conversion circuit to form a supply circuit.
In one embodiment of the present invention, a circuit control module includes:
the memory is used for storing program codes of the processing procedures in the multi-path intelligent control method;
and the processor is used for executing the program codes of the processing procedures in the multi-path intelligent control method.
The processor may employ a DSP (Digital Signal Processor) digital signal processor, an FPGA (Field-Programmable Gate Array) Field programmable gate array, a MCU (Microcontroller Unit) system board, a SoC (system on a chip) system board, or an PLC (Programmable Logic Controller) minimum system including I/O.
The multichannel intelligent control circuit for the high-voltage distribution box provided by the embodiment of the invention replaces auxiliary contacts of the pre-charging resistor, the pre-charging contactor and the main contactor by forming the power conversion circuit and the controlled pre-charging circuit, so that the optimization of the size space and the weight of the distribution box is realized, and the manufacturing cost is saved. The pre-charging power signal formed by using the PWM control mode has the technical advantages of flexible and adjustable pre-charging speed and voltage precision, can realize accurate switching between a pre-charging link and a closing link of the main contactor, and prolongs the service life of the main contactor. The high integration of the multi-path intelligent control circuit provides a circuit foundation for the judgment of voltage detection, on detection and adhesion detection by adopting the least professional sensors, so that the control circuit of the distribution box is further simplified.
Multipath for high-voltage distribution box according to one embodiment of the inventionThe structure of the high voltage loop of the intelligent control circuit is shown in fig. 3. In fig. 3, the power conversion circuit of the high voltage loop comprises a filter capacitor C, IGBT switch tube T, a diode D, an inductance coil L, an input voltage sensor V1 and an output voltage sensor V2, and the controlled pre-charge loop comprises a branch selection switch tube S n The collector of the IGBT switch tube T is connected with a high-voltage input positive electrode, the emitter of the IGBT switch tube T is connected with the negative electrode of the diode D in series, the positive electrode of the diode D is connected with the high-voltage input negative electrode, the two ends of the filter capacitor C are respectively connected with the collector and the emitter of the IGBT switch tube T, and the emitter of the IGBT switch tube T is connected with the branch selection switch tube S in parallel after being connected with the inductance coil L in series n The grid of the IGBT switch tube T is connected with a corresponding control signal output pin or interface of a circuit control module, an input voltage sensor V1 is connected with a filter capacitor C in parallel, one end of an output voltage sensor V2 is connected with the anode of a diode D, and the other end of the output voltage sensor V2 is connected with an inductance coil L and a parallel branch selection switch tube S n Between each two, each branch selecting switch tube S n(n＝1,2,3…) Is connected in series in a controlled pre-charge loop.
As shown in fig. 3, in an embodiment of the present invention, the branch selection switch tube S n The Insulated Gate Bipolar Transistor (IGBT) comprises two Insulated Gate Bipolar Transistors (IGBT), wherein the two insulated gate bipolar transistors are connected in an anti-parallel mode, and specifically, the collector and the emitter of one insulated gate bipolar transistor are correspondingly connected with the emitter and the collector of the other insulated gate bipolar transistor. As shown in fig. 3, in an embodiment of the present invention, gates of the two insulated gate bipolar transistors and the IGBT switching tube T are respectively connected to corresponding control signal output pins or interfaces of the circuit control module.
The high-voltage loop in the multi-path intelligent control circuit for the high-voltage distribution box of the embodiment of the invention passes through the parallel branch selection switch tube S n A controlled parallel controlled pre-charge loop is formed, a series transmission circuit of the power conversion circuit is formed by the emitter of the IGBT switch tube T and the inductance coil L, and the series transmission circuit and the parallel controlled pre-charge loop are sequentially connected.
The high-voltage loop of the embodiment of the invention controls the high-voltage power signal of the input side to form pre-chargingAnd after the power signal, forming corresponding pre-charging branches of each power distribution branch through a serial transmission circuit and a parallel controlled pre-charging loop. And the on-off enabling of the pre-charging branch is determined through the selection of a branch selection switch tube Sn. The circuit state judgment data obtained by the pre-charging resistor, the pre-charging contactor and the discrete sensors on the auxiliary contacts of the main contactor can be obtained through the voltage detection of the nodes and the input side on the serial transmission circuit and the parallel controlled pre-charging circuit by the corresponding voltage sensors, so that the circuit structure of the high-voltage circuit is greatly simplified. At the same time, IGBT switching tube T and branch selection switching tube S are utilized n The controllable characteristic of the parallel pre-charging branch circuit is well controlled, and the high-voltage loop can adapt to the huge difference of circuit loads of all distribution branch circuits and distribution requirements. High-speed precharge, reliable power distribution, and power down processes can be achieved. The contact state of the main contactor is accurately monitored, the main contactor is protected, and the service life of the main contactor is prolonged. The multipath intelligent control circuit based on the embodiment of the invention can be applied to any similar application system needing direct current power distribution.
The multichannel intelligent control method for the high-voltage distribution box provided by the embodiment of the invention comprises the following steps:
the controlled forming gating signal enables the controlled pre-charging loop, and the pulse width modulation wave regulating power conversion circuit outputs a pre-charging power signal.
The pre-charge control process in the multi-channel intelligent control method for the high-voltage distribution box according to the embodiment of the invention is shown in fig. 4. In fig. 4, the precharge control process includes:
switching on a branch selection switch S according to the gating signal x Forming a pre-charging current path of an IGBT switching tube T-inductance coil L-determining load;
the IGBT switching tube T is controlled by current and voltage to output voltage U o Is stabilized at the control target voltage U o.ref The method comprises the steps of carrying out a first treatment on the surface of the Control target voltage U o.ref The distribution voltage required by the effective on-off of the main contactor of the distribution branch is related; the current-voltage control may be sequential control or synchronous control;
when outputting voltage U o Not less than control target voltage U o.ref In the time-course of which the first and second contact surfaces,the precharge flow path is precharged, pmw control on the IGBT switching tube T is stopped, the path selection switching tube Sx is disabled, the precharge flow path is disconnected, and the main contactor in the corresponding power distribution branch is controlled to act to connect the power distribution branch;
when the output voltage U is not reached o Not less than control target voltage U o.ref And entering a fault processing mode.
The dual closed-loop control strategy adopted in the current-voltage control process in the multi-path intelligent control method for the high-voltage distribution box according to the embodiment of the invention is shown in fig. 5. In fig. 5, the dual closed loop control strategy includes:
a. setting a precharge voltage error quantization process V comp For comparing the output voltage U o And control target voltage U o.ref And forming a voltage deviation quantized signal by the difference value.
In the present embodiment, the target voltage U is controlled o.ref Is 90% of the distribution voltage UH of the distribution branch required for the active action of the distribution branch main contactor contacts.
b. Set voltage closed loop control process C V For forming an output current saturation value (iL.max), adjusting the output voltage U according to the voltage deviation quantization signal o The output current desaturation is formed from the voltage deviation quantized signal.
It will be appreciated by those skilled in the art that the output initial value and the output variation value and variation interval formed from the input may be set by a corresponding phase locked loop or PI control circuit. The output current saturation value (il.max) is determined by the active device parameter characteristics in the precharge current path. At the output voltage U o Reaching the control target voltage U o.ref The time-voltage deviation quantization signal is minimum, and is based on the output current and the control target voltage Uo. ref And the associated current output of the power conversion circuit tends to desaturate causing the output current of the power conversion circuit to drop.
c. Setting an inductance current error calculation process I comp And the current deviation quantization signal is formed by comparing the difference value between the output current iL and the output current saturation value.
d. Set current closed loop control process C I For use inA pmw wave signal is formed from the current deviation quantized signal.
e. Setting an IGBT switch control process PWM for controlling an IGBT switch tube T to output a pulse power signal to form an output current iL and an output voltage U according to a pmw wave signal o 。
According to the double closed-loop control strategy formed by the multi-path intelligent control method for the high-voltage distribution box, the output current saturation value is determined to enable the pre-charging output voltage to linearly rise, the current output supersaturation state and the current output desaturation state in the voltage closed-loop control process are utilized to adjust the power output in the current closed-loop control process, the matching of the pre-charging instantaneous power in the pre-charging current path with the load and the main contactor is achieved, and the on-off reliability of the main contactor is guaranteed.
In practical application, the output voltage U is precharged in the precharge current path o Reaching the control target voltage U o.ref When the output current saturation value is changed from the oversaturation state to the undersaturation state, the output current saturation value is reduced, so that the precharge output current iL is dynamically reduced to form a precharge output voltage U o Is stabilized at the control target voltage U o.ref The voltage difference at two ends of the main contactor of the pre-charging current path is only 10% of the distribution voltage UH of the distribution branch, so that the action hidden trouble of the main contactor on the distribution branch is basically eliminated. Meanwhile, the voltage change of different circuit nodes in the control process of the double closed-loop control strategy can become an accurate judgment basis for the action of the executing mechanism on the power distribution branch.
In one embodiment of the present invention, the precharge speed is further increased by adjusting the saturation value il.max of Cv output by selecting loop circuit elements with greater current carrying capacity. The precharge time is reduced by half for every doubling of the output current saturation value il.max.
The process of detecting distribution branches deployed in the circuit control module of the multi-path intelligent control circuit for the high-voltage distribution box according to an embodiment of the invention is shown in fig. 6. In fig. 6, the distribution branch detection process includes:
switch tube S is selected according to branch n The number of the detection process cycles is set to detect the voltage change of each distribution branch;
in each detection process, the branch selection switch tube S is controlled x Enabling to form a corresponding precharge current path; at the moment, the IGBT switch tube T does not output a power signal;
after the time delay is determined, the branch selection switch tube S is disabled after voltage data of the corresponding power distribution branch is indirectly obtained through voltage sampling of the pre-charging current path x The corresponding precharge flow path is disconnected.
The power-off control process of the power distribution branch circuit deployed in the circuit control module of the multi-path intelligent control circuit for the high-voltage distribution box according to an embodiment of the invention is shown in fig. 7. In fig. 7, the power distribution branch power outage control process includes:
determining the disconnection of a main contactor of the power distribution branch circuit according to the control requirement;
after the time delay determines the time length, the branch selection switch tube S corresponding to the determined distribution branch is enabled x Forming a corresponding precharge flow path; at the moment, the IGBT switch tube T does not output a power signal;
when the output voltage U of the precharging current path o When descending, the branch selection switch tube S corresponding to the determined distribution branch is disabled x Judging and determining that the disconnection of the power distribution branch is completed;
when the output voltage U of the precharging current path o When the operation is kept, a fault handling mode is entered.
The present invention is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.
Claims (9)
1. A multichannel intelligent control circuit for high voltage distribution box, characterized by comprising:
the high-voltage loop is used for connecting a high-voltage power signal to the input side, forming a controlled pre-charging loop connected with the load end of the contactor in the power distribution branch circuit on the output side as required, and forming a power conversion circuit between the input side and the output side, and outputting a controlled pre-charging power signal to the gated controlled pre-charging loop;
the circuit control module is used for controlling formation of a gating signal to enable the controlled pre-charge loop, forming a pulse width modulation wave to regulate the power conversion circuit to output the pre-charge power signal;
the power conversion circuit comprises a filter capacitor C, IGBT switch tube T, a diode D and an inductance coil L, and the controlled pre-charging loop comprises a branch selection switch tube S n The collector of the IGBT switch tube T is connected with a high-voltage input positive electrode, the emitter of the IGBT switch tube T is connected with the negative electrode of a diode D in series, the positive electrode of the diode D is connected with the high-voltage input negative electrode, two ends of a filter capacitor C are respectively connected with the collector and the emitter of the IGBT switch tube T, and the emitter of the IGBT switch tube T is connected with an inductance coil L in series and then is connected with a branch selection switch tube S in parallel n The grid electrode of the IGBT switching tube T is connected with a corresponding control signal output pin or interface of the circuit control module, and each branch selection switching tube S n And the control circuit is connected in series in one path of the controlled pre-charging loop.
2. The multi-path intelligent control circuit for high-voltage distribution box according to claim 1, further comprising an input voltage sensor V1 and an output voltage sensor V2, wherein the input voltage sensor V1 is connected in parallel with a filter capacitor C, one end of the output voltage sensor V2 is connected with the positive electrode of a diode D, and the other end of the output voltage sensor V2 is connected with the inductance coil L and the parallel branch selection switch tube S n Between them.
3. The multi-path intelligent control circuit for a high voltage distribution box according to claim 2, wherein the circuit control module comprises:
the memory is used for storing program codes of the processing procedures in the multi-path intelligent control method;
and the processor is used for executing the program codes of the processing procedures in the multi-path intelligent control method.
4. A multi-path intelligent control method for a high-voltage distribution box, using the multi-path intelligent control circuit for a high-voltage distribution box according to any one of claims 1 to 2, comprising:
and the controlled forming gating signal enables the controlled pre-charging loop, and the pulse width modulation wave is formed to regulate the power conversion circuit to output the pre-charging power signal.
5. The multi-path intelligent control method for a high-voltage distribution box according to claim 4, comprising a pre-charge control process:
switching on a branch selection switch S according to the gating signal x Forming a pre-charging current path of an IGBT switching tube T-inductance coil L-determining load;
the IGBT switching tube T is controlled by current and voltage to output voltage U o Is stabilized at the control target voltage U o.ref ；
When outputting voltage U o Not less than control target voltage U o.ref When the precharge flow path is precharged, pmw control on the IGBT switching tube T is stopped, the path selection switching tube Sx is disabled, the precharge flow path is disconnected, and a main contactor in the corresponding power distribution branch is controlled to act to connect the power distribution branch;
when the output voltage U is not reached o Not less than control target voltage U o.ref And entering a fault processing mode.
6. The multi-path intelligent control method for a high voltage distribution box according to claim 5, wherein the pre-charge control process comprises a double closed loop control strategy:
a. setting a precharge voltage error quantization process V comp For comparing the output voltage U o And control target voltage U o.ref Forming a voltage deviation quantized signal by the difference value;
b. set voltage closed loop control process C V For forming an output current saturation value (iL.max), adjusting the output voltage U according to the voltage deviation quantization signal o Forming an output current desaturation according to the voltage deviation quantized signal;
c. setting an inductance current error calculation process I comp The method comprises the steps of comparing a difference value between an output current iL and an output current saturation value to form a current deviation quantization signal;
d. set current closed loop control process C I A step of forming a pmw wave signal from the current deviation quantized signal;
e. setting an IGBT switch control process PWM for controlling an IGBT switch tube T to output a pulse power signal to form an output current iL and an output voltage U according to a pmw wave signal o 。
7. The multi-path intelligent control method for a high-voltage distribution box according to claim 5, wherein the control target voltage U o.ref Is 90% of the distribution voltage UH required for the active action of the distribution branch main contactor contacts.
8. The multi-path intelligent control method for high-voltage distribution box according to claim 4, comprising the distribution branch detection process:
switch tube S is selected according to branch n The number of the detection process cycles is set to detect the voltage change of each distribution branch;
in each detection process, the branch selection switch tube S is controlled x Enabling to form a corresponding precharge current path; at the moment, the IGBT switch tube T does not output a power signal;
after the time delay is determined, the branch selection switch tube S is disabled after voltage data of the corresponding power distribution branch is indirectly obtained through voltage sampling of the pre-charging current path x The corresponding precharge flow path is disconnected.
9. The multi-path intelligent control method for a high-voltage distribution box according to claim 4, comprising a distribution branch power-off control process:
determining the disconnection of a main contactor of the power distribution branch circuit according to the control requirement;
after the time delay determines the time length, the branch selection switch tube S corresponding to the determined distribution branch is enabled x Form a corresponding precharge flowA road; at the moment, the IGBT switch tube T does not output a power signal;
when the output voltage U of the precharging current path o When descending, the branch selection switch tube S corresponding to the determined distribution branch is disabled x Judging and determining that the disconnection of the power distribution branch is completed;
when the output voltage U of the precharging current path o When the operation is kept, a fault handling mode is entered.
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| US6768621B2 (en) * | 2002-01-18 | 2004-07-27 | Solectria Corporation | Contactor feedback and precharge/discharge circuit |
| CN105119501B (en) * | 2015-08-26 | 2018-06-12 | 长沙奥托自动化技术有限公司 | The pre-charge circuit and pre-charge method of a kind of low voltage frequency converter |
| CN106230057B (en) * | 2016-08-18 | 2019-03-29 | 西北工业大学 | A kind of precharge of frequency converter and error protection integrated apparatus |
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