CN109591626B - Protection method, system and device for pre-charging resistor and storage medium - Google Patents

Protection method, system and device for pre-charging resistor and storage medium Download PDF

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CN109591626B
CN109591626B CN201811186966.3A CN201811186966A CN109591626B CN 109591626 B CN109591626 B CN 109591626B CN 201811186966 A CN201811186966 A CN 201811186966A CN 109591626 B CN109591626 B CN 109591626B
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charging
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CN109591626A (en
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杜兴乐
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Suzhou Huichuan United Power System Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/14—Plug-in electric vehicles

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Abstract

The embodiment of the invention provides a protection method, a system, a device and a storage medium of a pre-charging resistor, which are applied to a pre-charging loop of high-voltage electrification, wherein the pre-charging loop comprises a loop formed by a charging power supply, a pre-charging resistor, a pre-charging contactor and a load, and the protection method of the pre-charging resistor comprises the following steps: when the conduction time of the pre-charging loop reaches a preset charging stage, judging whether the charging voltages at two ends of the load meet the charging requirement corresponding to the preset charging stage; if the charging requirement corresponding to the preset charging stage is not met, disconnecting the pre-charging contactor and outputting an abnormal alarm signal corresponding to the preset charging stage; the whole charging process of the pre-charging loop is divided into a plurality of preset charging stages according to the charging time, and each preset charging stage is provided with a corresponding charging requirement and an abnormal alarm mode. According to the embodiment of the invention, the abnormality of the pre-charging loop is quickly identified and pre-warning protection is realized through a grading pre-warning mechanism, and the safety of the pre-charging resistor is improved.

Description

Protection method, system and device for pre-charging resistor and storage medium
Technical Field
The embodiment of the invention relates to the technical field of electric automobiles, in particular to a protection method, a system, a device and a storage medium for a pre-charging resistor.
Background
High-voltage equipment such as a motor driver in an electric automobile needs a pre-charging loop during high-voltage electrification. Referring to fig. 1, a schematic circuit diagram of a typical high-voltage power-on pre-charge circuit is shown, where R represents a virtual resistor, which reflects whether the power-consuming equipment 14 is abnormal, and in a normal case, the resistance value of the equivalent resistor R of the power-consuming equipment is very large, and the smaller the resistance value of the equivalent resistor R, the more serious the fault occurs in the power-consuming equipment 14; during normal high-voltage pre-charging, after the pre-charging contactor Kp is closed, an RC loop is formed by the pre-charging resistor Rp and the equivalent capacitor C of the electric equipment, after pre-charging for a period of time, the voltage at two ends of the equivalent capacitor C of the electric equipment is basically consistent with the voltage of the high-voltage direct-current power supply 11, at the moment, the main contactor Km is closed, then the pre-charging contactor Kp is opened, and at the moment, the high-voltage electrification is finished; when some abnormality, such as a short circuit, occurs to the electric equipment, it is shown that the resistance value of the equivalent resistor R of the electric equipment is very small, and is 0 during the short circuit, so that the voltage across the electric equipment 14 cannot be increased to be close to the voltage across the high-voltage direct-current power supply 11 all the time during the pre-charging, and at this time, the voltage across the pre-charging resistor Rp is the voltage across the high-voltage direct-current power supply 11 minus the voltage across the electric equipment 14, so that the smaller the resistance value of the equivalent resistor R of the electric equipment is, the larger the voltage across the pre-charging resistor Rp is, and the larger the voltage across the pre-charging resistor Rp is continuously loaded, thereby causing heating damage.
In order to ensure the operation safety of the pre-charging circuit, the protection scheme of the existing pre-charging circuit is generally as follows: by detecting the pre-charging voltage in the high-voltage pre-charging process, namely the voltage at two ends of the capacitor C of the electric equipment, the abnormal condition of the pre-charging circuit can be alarmed only after the pre-charging voltage is continuously judged to be always lower than the threshold value, and the normal charging cannot be realized. The judgment time of the protection scheme of the pre-charging circuit is long, the abnormality of the pre-charging circuit cannot be detected in the first time, so that the pre-charging contactor cannot be timely disconnected when the pre-charging circuit is abnormal, the two ends of the pre-charging resistor still have high voltage, and the pre-charging resistor is loaded with high power in a short time, so that the pre-charging resistor is easily heated and damaged quickly.
Disclosure of Invention
Embodiments of the present invention provide a protection method, a protection system, a protection device, and a computer-readable storage medium for a pre-charge resistor, which are used to solve the problems that in the above-mentioned conventional pre-charge circuit protection technical solution, the judgment time in the process of detecting an abnormality in a pre-charge circuit is long, the abnormality in the pre-charge circuit cannot be detected within the first time, and a pre-charge contactor cannot be turned off in time when the pre-charge circuit sends an abnormality, which is likely to cause damage to the pre-charge resistor.
The technical solution for solving the above technical problem according to an embodiment of the present invention is to provide a protection method for a pre-charging resistor, which is applied to a pre-charging loop for high-voltage power-up, where the pre-charging loop includes a loop formed by a charging power supply, a pre-charging resistor, a pre-charging contactor, and a load, and the protection method for the pre-charging resistor includes:
when the conduction time of the pre-charging loop reaches a preset charging stage, judging whether the charging voltages at two ends of the load meet the charging requirement corresponding to the preset charging stage;
if the charging requirement corresponding to the preset charging stage is not met, disconnecting the pre-charging contactor and outputting an abnormal alarm signal corresponding to the preset charging stage;
the whole charging process of the pre-charging loop is divided into a plurality of preset charging stages according to the charging time, and each preset charging stage is provided with a corresponding charging requirement and an abnormal alarm mode.
In the protection method for the pre-charging resistor, in the process of carrying out normal pre-charging on the load by the pre-charging loop, the voltage of the load is measured when the pre-charging loop is in a preset time length, and a preset voltage threshold value is generated according to the measured voltage.
In the protection method for the pre-charge resistor, when the on-time of the pre-charge circuit reaches a preset charge stage, determining whether the charge voltage at the two ends of the load meets a charge requirement corresponding to the preset charge stage includes:
when the conducting time of the pre-charging loop reaches a first preset charging stage, judging whether the charging voltage at two ends of the load is smaller than a first voltage threshold value or not; when the on-time of the pre-charging circuit reaches a first preset time t1, the first preset charging stage is judged to be reached, and t1 is greater than 0;
if the charging requirement corresponding to the preset charging stage is not met, disconnecting the pre-charging contactor, and outputting an abnormal alarm signal corresponding to the preset charging stage comprises the following steps:
if the charging voltage is smaller than the first voltage threshold, the charging requirement of the first preset charging stage is not met, at the moment, the pre-charging contactor is disconnected, and a primary abnormal alarm signal is output.
In the protection method for the pre-charge resistor, after determining whether the charging voltage across the load is less than the first voltage threshold when the on-time of the pre-charge circuit reaches the first preset charging stage, the method further includes:
if the charging voltage is greater than or equal to the first voltage threshold, judging whether the charging voltage at the two ends of the load is smaller than a second voltage threshold when the conducting time of the pre-charging loop reaches a second preset charging stage; when the on-time of the pre-charging circuit reaches a second preset time t2, the pre-charging circuit is judged to reach the second preset charging stage, and t2> t1> 0;
if the charging voltage is smaller than the second voltage threshold value, the charging requirement of the second preset charging stage is not met, at the moment, the pre-charging contactor is disconnected, and a secondary abnormal alarm signal is output.
In the protection method for the pre-charge resistor, when the on-time of the pre-charge circuit reaches a second preset charge stage, after determining whether the charge voltage across the load is smaller than a second voltage threshold, the method further includes:
if the charging voltage is greater than or equal to the second voltage threshold, judging whether the charging voltage at the two ends of the load is less than a third voltage threshold when the conducting time of the pre-charging loop reaches a third preset charging stage; when the on-time of the pre-charging circuit reaches a third preset time t3, the pre-charging circuit is judged to reach the third preset charging stage, and t3> t2> t1> 0;
and if the charging voltage is smaller than the third voltage threshold, the charging requirement of the third preset charging stage is not met, at the moment, the pre-charging contactor is disconnected, and a three-stage abnormal alarm signal is output.
In the protection method for the pre-charge resistor, when the on-time of the pre-charge circuit reaches a third preset charging stage, after determining whether the charging voltage across the load is less than a third voltage threshold, the method further includes:
if the charging voltage is greater than or equal to the third voltage threshold, judging whether the charging voltage at the two ends of the load is less than a fourth voltage threshold when the conducting time of the pre-charging loop reaches a fourth preset charging stage; when the on-time of the pre-charging loop is greater than the preset theoretical charging completion time t4, the fourth preset charging stage is judged to be reached, and t4> t3> t2> t1> 0;
if the charging voltage is smaller than the fourth voltage threshold, the charging requirement of the fourth preset charging stage is not met, at the moment, the pre-charging contactor is disconnected, and a four-stage abnormal alarm signal is output.
In the protection method for the pre-charge resistor, the voltage threshold in the charge requirement corresponding to each preset charge stage is calculated as follows:
Figure BDA0001826477580000031
wherein R is a resistance value of an equivalent resistance of the load, C is a capacitance value of an equivalent capacitance of the load, VtIs the voltage value, V, across the load at time tuFor the voltage value, V, across the load after charging is completed0Is the initial voltage value across the load.
In the protection method for the pre-charge resistor, the pre-charge circuit further includes a main contactor, the main contactor is connected in parallel with the pre-charge resistor and the pre-charge contactor after being connected in series, and when the conduction time of the pre-charge circuit reaches a preset charge stage, the method further includes the following steps of determining whether the charge voltages at two ends of the load meet a charge requirement corresponding to the preset charge stage:
and if the charging voltage meets the charging requirement corresponding to the preset charging stage, disconnecting the pre-charging contactor and closing the main contactor when the voltages at the two ends of the load reach the target charging voltage.
The embodiment of the invention also provides a pre-charging loop protection system, which is applied to a pre-charging loop on high voltage, wherein the pre-charging loop comprises a loop formed by a charging power supply, a pre-charging resistor, a pre-charging contactor and a load, and the pre-charging resistor protection system comprises:
the charging voltage detection unit is used for judging whether the charging voltages at two ends of the load meet the charging requirement corresponding to a preset charging stage or not when the conducting time of the pre-charging loop reaches the preset charging stage;
the abnormal alarm unit is used for disconnecting the pre-charging contactor and outputting an abnormal alarm signal corresponding to the preset charging stage if the charging voltage at the two ends of the load does not accord with the charging requirement corresponding to the preset charging stage;
the whole charging process of the pre-charging loop is divided into a plurality of preset charging stages according to the charging time, and each preset charging stage is provided with a corresponding charging requirement and an abnormal alarm mode.
The embodiment of the invention also provides a protection device for a pre-charging resistor, which comprises a memory and a processor, wherein a computer program capable of being run on the processor is stored in the memory, and the processor executes the computer program to realize the steps of the protection method for the pre-charging resistor.
An embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method for protecting a pre-charge resistor are implemented.
The protection method, the system, the device and the storage medium of the pre-charging resistor of the embodiment of the invention detect the load voltage in stages, compare the load voltage with the preset voltage threshold value of the corresponding stage, can early warn and protect in stages in the pre-charging process, can quickly identify the abnormity of the pre-charging circuit, disconnect the pre-charging circuit and output in time when the abnormity occurs, protect the pre-charging resistor, prevent the damage of the pre-charging resistor from causing the failure of high-voltage power-up of the load, and improve the safety of the pre-charging circuit.
Drawings
FIG. 1 is a schematic circuit diagram of a typical high voltage pre-charge circuit of the prior art;
FIG. 2 is a flow chart illustrating a protection method for pre-charging resistors according to an embodiment of the present invention;
FIG. 3 is a diagram of a protection device for pre-charging resistors according to an embodiment of the present invention;
FIG. 4 is a functional block diagram of a protection system for pre-charging resistors according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clearly apparent, the embodiments of the present invention are described in further detail below with reference to the accompanying drawings and the embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the embodiments of the invention and are not limiting of the embodiments of the invention.
Fig. 2 is a flowchart illustrating a protection method for a pre-charge resistor according to an embodiment of the present invention, where the protection method is applied to a pre-charge circuit for high voltage power-up. As shown in fig. 1, the precharge circuit includes a circuit including a charging power source 11, a precharge resistor Rp, a precharge contactor Kp, and a load 14. The protection method of the pre-charge resistor of the embodiment comprises the following steps:
s1, when the on-time of the pre-charging circuit reaches a preset charging stage, determining whether the charging voltage across the load 14 meets the charging requirement corresponding to the preset charging stage.
And S2, if the charging requirement corresponding to the preset charging stage is not met, disconnecting the pre-charging contactor and outputting an abnormal alarm signal corresponding to the preset charging stage.
The whole charging process of the pre-charging loop is divided into a plurality of preset charging stages according to the charging time, and each preset charging stage is provided with a corresponding charging requirement and an abnormal alarm mode.
After the pre-charging loop is conducted, when the pre-charging duration time reaches the preset time, if the pre-charging loop is abnormal, such as short circuit and the like, the resistance value of the load 14 is significantly reduced (0 in the case of short circuit), so that the voltage of the load 14 at two ends of the electric equipment cannot be increased to the normal working voltage in the normal pre-charging process all the time in the pre-charging process, that is, the voltage at two ends of the load 14 is smaller than the normal working voltage of the load 14 in the normal charging process of the charging loop in the charging loop, therefore, whether the pre-charging loop is in fault or not can be judged by comparing the charging voltage at two ends of the load 14 with the voltage threshold value in a certain time period, and then the pre-charging loop is timely disconnected and a preset alarm signal is output when the pre-charging loop is abnormal.
According to the protection method for the pre-charging resistor, the fault of the pre-charging circuit can be identified more quickly through the grading early warning, the protection strategy is adopted in time, and the safety of the pre-charging circuit is effectively improved.
In the embodiment of the invention, four preset charging stages are taken as an example, the charging time of the whole charging process is divided into a first preset charging stage, a second preset charging stage, a third preset charging stage and a fourth preset charging stage, and each preset charging stageThe conducting time of the pre-charging loop in the stage is respectively a first preset time t1, a second preset time t2, a third preset time t3 and a preset theoretical charging completion time t 4. Accordingly, whether an abnormality occurs or not may be determined by calculating a corresponding voltage threshold (i.e., V) according to each preset timet) Including a first voltage threshold, a second voltage threshold, a third voltage threshold, and a fourth voltage threshold. The voltage threshold in the charging requirement corresponding to each preset charging stage can be obtained by calculating according to the following calculation formula (1):
Figure BDA0001826477580000061
wherein R is a resistance value of an equivalent resistance of the load, C is a capacitance value of an equivalent capacitance of the load, VtIs the voltage value, V, across the load 14 at time tuFor the value of the voltage across the load 14 after charging is completed, V0Is the initial voltage value across the load 14.
Specifically, when the duration of the high-voltage pre-charging in the pre-charging circuit reaches the first preset charging stage:
step S1 includes, when the on-time of the pre-charging circuit reaches a first preset charging stage, determining whether the charging voltage across the load 14 is smaller than a first voltage threshold; when the on-time of the pre-charging circuit reaches a first preset time t1, it is determined that the first preset charging stage is reached, and t1 is greater than 0. When the charging voltage across the load 14 is greater than or equal to the first voltage threshold, the pre-charging circuit is considered to be operating normally, and the load 14 is continuously charged.
Step S2 includes that, if the charging voltage when the on-time of the pre-charging circuit reaches the first preset time t1 is less than the first voltage threshold, the charging requirement of the first preset charging stage is not met, and at this time, the pre-charging contactor is turned off, and a primary abnormal alarm signal is output.
Further, when the duration of the high-voltage pre-charging in the pre-charging circuit reaches a second preset charging stage:
step S1 includes, if the charging voltage is greater than or equal to the first voltage threshold when the duration of the high voltage pre-charging reaches a first preset charging stage, determining whether the charging voltage across the load 14 is less than a second voltage threshold when the on-time of the pre-charging loop reaches a second preset charging stage; when the on-time of the pre-charging circuit reaches a second preset time t2, the second preset charging stage is determined to be reached, and t2> t1> 0. When the charging voltage across the load 14 is greater than or equal to the second voltage threshold, the pre-charging circuit is considered to be operating normally, and the load 14 is continuously charged.
Step S2 includes that, if the charging voltage when the on-time of the pre-charging circuit reaches the second preset time t2 is less than the second voltage threshold, the charging requirement of the second preset charging stage is not met, and at this time, the pre-charging contactor is turned off, and a secondary abnormal alarm signal is output.
Further, the duration of the high-voltage pre-charging in the pre-charging circuit reaches a third pre-charging stage:
step S1 includes, if the charging voltage is greater than or equal to the second voltage threshold when the duration of the high voltage pre-charging reaches the second preset charging stage, determining whether the charging voltage across the load 14 is less than a third voltage threshold when the on-time of the pre-charging loop reaches a third preset charging stage; when the on-time of the pre-charging circuit reaches a third preset time t3, the third preset charging stage is determined to be reached, and t3> t2> t1> 0. When the charging voltage across the load 14 is greater than or equal to the third voltage threshold, the pre-charging circuit is considered to be operating normally, and the load 14 is continuously charged.
Step S2 includes that, if the charging voltage when the on-time of the pre-charging circuit reaches the third preset time t3 is less than the third voltage threshold, the charging requirement of the third preset charging stage is not met, at this time, the pre-charging contactor is turned off, and a three-stage abnormal alarm signal is output.
Further, the duration of the high-voltage pre-charging in the pre-charging circuit reaches a fourth pre-charging stage:
step S1 includes, if the charging voltage is greater than or equal to the third voltage threshold when the duration of the high voltage pre-charging reaches a third preset charging stage, determining whether the charging voltage across the load 14 is less than a fourth voltage threshold when the on-time of the pre-charging loop reaches a fourth preset charging stage; when the on-time of the pre-charging circuit is greater than the preset theoretical charging completion time t4, the fourth preset charging stage is determined to be reached, and t4> t3> t2> t1> 0. When the charging voltage across the load 14 is equal to the fourth voltage threshold, that is, the target charging voltage is reached, the pre-charging contactor is turned off, and the process of charging the load 14 by the pre-charging circuit is ended.
Step S2 includes that, if the charging voltage when the on-time of the pre-charging circuit reaches the fourth preset time t4 is less than the fourth voltage threshold, the charging requirement of the fourth preset charging stage is not met, and at this time, the pre-charging contactor is turned off, and a four-stage abnormal alarm signal is output.
Further, the pre-charging circuit further includes a main contactor Km, the main contactor Km being connected in parallel with the pre-charging resistor Rp and the pre-charging contactor Kp after being connected in series, and after step S1, the method further includes:
and if the charging voltage meets the charging requirement corresponding to the preset charging stage, disconnecting the pre-charging contactor and closing the main contactor when the voltages at the two ends of the load reach the target charging voltage. I.e., indicating that the high voltage power-up of load 14 is complete.
According to the protection method of the pre-charging resistor, the four pre-charging stages are divided according to the charging time, each pre-charging stage is provided with a corresponding charging requirement and an abnormal alarm mode, each stage can be pre-warned and protected, compared with the prior art, the pre-warning protection is only carried out in the last detection stage, the fault of the pre-charging circuit can be identified more quickly by the aid of the grading pre-warning scheme, a protection strategy is adopted in time, and the safety of the pre-charging circuit is effectively improved. In addition, because the voltage at the two ends of the pre-charging resistor is the high-voltage direct-current power supply voltage minus the load voltage, when the pre-charging loop breaks down, the smaller the load voltage is, the larger the voltage at the two ends of the pre-charging resistor is, so that the pre-charging resistor is easily damaged by heating, and a graded early warning protection mechanism is adopted, so that the pre-charging resistor can be quickly protected, and the problem that the high-voltage power-on of a load (such as a motor driver) cannot be completed due to the damage of the pre-charging resistor is effectively avoided.
It should be noted that the precharging time includes at least one detection stage, which can be set according to the performance parameters of the precharging circuit, and the more detection stages, the higher the early warning protection level.
As shown in fig. 3, an embodiment of the present invention further provides a protection device for a pre-charge resistor, where the protection device for the pre-charge resistor can be used in a pre-charge circuit of a high-voltage device such as a motor driver in an electric vehicle. The protection device for the pre-charge resistor in the present embodiment includes a memory 31 and a processor 32, where a computer program operable on the processor 32 is stored in the memory 31, and the processor 32 implements the steps of the protection method for the pre-charge resistor when executing the computer program. The protection device for the pre-charging resistor in this embodiment is the same as the method in the embodiment corresponding to fig. 2, and the specific implementation process is described in detail in the corresponding method embodiment, and the technical features in the method embodiment are all applicable in this apparatus embodiment, and are not described herein again.
An embodiment of the present invention further provides a computer-readable storage medium, where the storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the method for protecting a pre-charge resistor are implemented. The computer-readable storage medium in this embodiment and the method in the embodiment corresponding to fig. 2 belong to the same concept, and specific implementation processes thereof are described in detail in the corresponding method embodiments, and technical features in the method embodiments are correspondingly applicable in the apparatus embodiments, and are not described herein again.
As shown in fig. 4, an embodiment of the present invention further provides a protection system for a pre-charge resistor, where the pre-charge circuit includes a circuit formed by a charging power supply, a pre-charge resistor, a pre-charge contactor, and a load, and the protection system for the pre-charge resistor includes a charging voltage detection unit 41 and an abnormality alarm unit 42, where:
the charging voltage detection unit 41 is configured to determine whether the charging voltages at two ends of the load meet the charging requirement corresponding to a preset charging stage when the on-time of the pre-charging loop reaches the preset charging stage.
And the abnormal alarm unit 42 is configured to disconnect the pre-charging contactor and output an abnormal alarm signal corresponding to the preset charging stage if the charging voltage at the two ends of the load does not meet the charging requirement corresponding to the preset charging stage.
The whole charging process of the pre-charging loop is divided into a plurality of preset charging stages according to the charging time, and each preset charging stage is provided with a corresponding charging requirement and an abnormal alarm mode.
According to the protection system of the pre-charging resistor, the charging voltage detection unit 41 and the abnormity alarm unit 42 are adopted to detect the load voltage in stages and compare the load voltage with the preset voltage threshold value of the corresponding stage, the pre-warning protection can be performed in stages in the pre-charging process, the abnormity of the pre-charging circuit can be rapidly identified, the pre-charging circuit is timely disconnected and output when the abnormity occurs, the pre-charging resistor is protected, the phenomenon that the high-voltage power-on of the load cannot be completed due to the damage of the pre-charging resistor is prevented, and the safety of the pre-charging circuit is improved.
The above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention will be covered by the scope of the present invention. Therefore, the protection scope of the embodiments of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. A protection method of a pre-charging resistor is applied to a pre-charging loop of high-voltage electrification, wherein the pre-charging loop comprises a loop formed by a charging power supply, a pre-charging resistor, a pre-charging contactor and a load, and the protection method of the pre-charging resistor comprises the following steps:
when the conduction time of the pre-charging loop reaches a preset charging stage, judging whether the charging voltages at two ends of the load meet the charging requirement corresponding to the preset charging stage;
if the charging requirement corresponding to the preset charging stage is not met, disconnecting the pre-charging contactor and outputting an abnormal alarm signal corresponding to the preset charging stage;
the whole charging process of the pre-charging loop is divided into a plurality of preset charging stages according to the charging time, and each preset charging stage is provided with a corresponding charging requirement and an abnormal alarm mode.
2. The method of claim 1, wherein determining whether the charging voltage across the load meets the charging requirement corresponding to a predetermined charging phase when the on-time of the pre-charging circuit reaches the predetermined charging phase comprises:
when the conducting time of the pre-charging loop reaches a first preset charging stage, judging whether the charging voltage at two ends of the load is smaller than a first voltage threshold value or not; when the on-time of the pre-charging circuit reaches a first preset time t1, the first preset charging stage is judged to be reached, and t1 is greater than 0;
if the charging requirement corresponding to the preset charging stage is not met, disconnecting the pre-charging contactor, and outputting an abnormal alarm signal corresponding to the preset charging stage comprises the following steps:
if the charging voltage is smaller than the first voltage threshold, the charging requirement of the first preset charging stage is not met, at the moment, the pre-charging contactor is disconnected, and a primary abnormal alarm signal is output.
3. The method as claimed in claim 2, wherein the determining whether the charging voltage across the load is less than the first voltage threshold when the on-time of the pre-charge circuit reaches the first pre-charge stage further comprises:
if the charging voltage is greater than or equal to the first voltage threshold, judging whether the charging voltage at the two ends of the load is smaller than a second voltage threshold when the conducting time of the pre-charging loop reaches a second preset charging stage; when the on-time of the pre-charging circuit reaches a second preset time t2, the pre-charging circuit is judged to reach the second preset charging stage, and t2> t1> 0;
if the charging voltage is smaller than the second voltage threshold value, the charging requirement of the second preset charging stage is not met, at the moment, the pre-charging contactor is disconnected, and a secondary abnormal alarm signal is output.
4. The method as claimed in claim 3, wherein the determining whether the charging voltage across the load is less than the second voltage threshold when the on-time of the pre-charge circuit reaches the second predetermined charging stage further comprises:
if the charging voltage is greater than or equal to the second voltage threshold, judging whether the charging voltage at the two ends of the load is less than a third voltage threshold when the conducting time of the pre-charging loop reaches a third preset charging stage; when the on-time of the pre-charging circuit reaches a third preset time t3, the pre-charging circuit is judged to reach the third preset charging stage, and t3> t2> t1> 0;
and if the charging voltage is smaller than the third voltage threshold, the charging requirement of the third preset charging stage is not met, at the moment, the pre-charging contactor is disconnected, and a three-stage abnormal alarm signal is output.
5. The method as claimed in claim 4, wherein the determining whether the charging voltage across the load is less than a third voltage threshold when the on-time of the pre-charge circuit reaches a third pre-charge stage further comprises:
if the charging voltage is greater than or equal to the third voltage threshold, judging whether the charging voltage at the two ends of the load is less than a fourth voltage threshold when the conducting time of the pre-charging loop reaches a fourth preset charging stage; when the on-time of the pre-charging loop is greater than the preset theoretical charging completion time t4, the fourth preset charging stage is judged to be reached, and t4> t3> t2> t1> 0;
if the charging voltage is smaller than the fourth voltage threshold, the charging requirement of the fourth preset charging stage is not met, at the moment, the pre-charging contactor is disconnected, and a four-stage abnormal alarm signal is output.
6. A protection method for pre-charge resistors as claimed in any one of claims 2 to 5, wherein the voltage threshold in the charging requirement corresponding to each preset charging phase is calculated as follows:
Figure FDA0001826477570000021
wherein R is a resistance value of an equivalent resistance of the load, C is a capacitance value of an equivalent capacitance of the load, VtIs the voltage value, V, across the load at time tuFor the voltage value, V, across the load after charging is completed0Is the initial voltage value across the load.
7. The method according to claim 1, wherein the pre-charging circuit further includes a main contactor, the main contactor is connected in parallel with the pre-charging resistor and the pre-charging contactor after being connected in series, and the determining whether the charging voltage across the load meets the charging requirement corresponding to the preset charging stage when the on-time of the pre-charging circuit reaches the preset charging stage further includes:
and if the charging voltage meets the charging requirement corresponding to the preset charging stage, disconnecting the pre-charging contactor and closing the main contactor when the voltages at the two ends of the load reach the target charging voltage.
8. A protection system of a pre-charging resistor is applied to a pre-charging loop of high-voltage electrification, the pre-charging loop comprises a loop formed by a charging power supply, a pre-charging resistor, a pre-charging contactor and a load, and the protection system of the pre-charging resistor comprises:
the charging voltage detection unit is used for judging whether the charging voltages at two ends of the load meet the charging requirement corresponding to a preset charging stage or not when the conducting time of the pre-charging loop reaches the preset charging stage;
the abnormal alarm unit is used for disconnecting the pre-charging contactor and outputting an abnormal alarm signal corresponding to the preset charging stage when the charging voltage at the two ends of the load does not accord with the charging requirement corresponding to the preset charging stage;
the whole charging process of the pre-charging loop is divided into a plurality of preset charging stages according to the charging time, and each preset charging stage is provided with a corresponding charging requirement and an abnormal alarm mode.
9. A protection device for a pre-charge resistor, comprising a memory and a processor, wherein the memory stores a computer program that can be executed by the processor, and the processor executes the steps of the computer program to implement the protection method for the pre-charge resistor according to any one of claims 1 to 7.
10. A computer-readable storage medium, characterized in that a computer program is stored on the computer-readable storage medium, which computer program, when being executed by a processor, carries out the steps of the method for protecting a pre-charge resistance according to any one of claims 1 to 7.
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