WO2017084137A1 - Auxiliary converter device - Google Patents
Auxiliary converter device Download PDFInfo
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- WO2017084137A1 WO2017084137A1 PCT/CN2015/097499 CN2015097499W WO2017084137A1 WO 2017084137 A1 WO2017084137 A1 WO 2017084137A1 CN 2015097499 W CN2015097499 W CN 2015097499W WO 2017084137 A1 WO2017084137 A1 WO 2017084137A1
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- auxiliary converter
- current value
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/16—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to fault current to earth, frame or mass
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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
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/1216—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for AC-AC converters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L1/00—Supplying electric power to auxiliary equipment of vehicles
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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
Definitions
- the invention relates to a flow conversion device for a railway vehicle, and in particular to an auxiliary flow conversion device.
- the electric drive system of rail transit has the characteristics of high voltage and high current, ensuring the normal operation of the drive system is the premise to ensure the reliable operation of the locomotive; the main circuit may occur due to cable aging, vibration and friction during the operation of the electric locomotive. Ground. In general, a little grounding will not cause any harm, and will not have much impact on the normal operation of the system. However, if two or more points are grounded, a large short-circuit current may be generated, resulting in an electric drive of the electric locomotive. Burning of system components can even lead to machine breakage in severe cases.
- the invention provides an auxiliary current changing device, which can accurately and quickly judge the ground fault for processing, thereby ensuring the safety and reliability of the electric locomotive operation.
- the present invention is to provide an auxiliary current converting device comprising an auxiliary converter unit connected between a three-phase AC power source and a ground, the auxiliary converter unit being connected with an auxiliary control unit; the auxiliary converter unit comprising a plurality of Auxiliary converters connected in parallel with each other;
- Each auxiliary converter is configured to perform an alternating current voltage outputted by the three-phase alternating current power source Step-down processing; and in the event of a ground fault, protect the circuit components; detect the value of the ground current flowing, and send the detected ground current value to the auxiliary control unit;
- the auxiliary control unit is configured to receive a ground current value sent by each auxiliary converter, and analyze the ground current value according to a preset standard threshold to determine an auxiliary converter that detects the ground current value. Whether a ground fault has occurred.
- the auxiliary converter specifically includes:
- a transformer connected to the three-phase AC power source for performing a step-down process on an AC voltage output by the three-phase AC power source
- a grounding resistance unit connected to the output end of the transformer for protecting the circuit component when a ground fault occurs
- a current sensor having one end connected to the grounding resistance unit and the other end connected to the ground for detecting a ground current value flowing through the grounding resistance unit when a ground fault occurs, and transmitting the detected ground current value to the auxiliary control unit .
- the auxiliary control unit analyzes the ground current value according to a preset standard threshold, which specifically includes:
- the auxiliary converter device as described above further includes:
- a power unit connected to the vehicle dynamic control system for inverting direct current through the vehicle dynamic control system to alternating current
- the filtering unit has one end connected to the output end of the power unit and the other end connected to the transformer.
- the power unit is a bridge circuit structure composed of three IGBT modules.
- the filtering unit includes a filter reactor connected between the power unit and the transformer, and is connected to the filter reactor, and A filter capacitor module in which the transformers are connected in parallel.
- the filter reactor includes a first reactor, a second reactor, and a third reactor respectively connected to the three IGBT modules.
- the filter capacitor module is a bridge circuit structure composed of three capacitors.
- the preset standard ground voltage threshold is less than or equal to 36V.
- the grounding resistance unit is constituted by a first resistor connected to the transformer and a second resistor connected in series with the first resistor, the second resistor and the current sensor Connected.
- the auxiliary current conversion device detects the ground current value flowing through the auxiliary current conversion device and sends it to the auxiliary control unit for analysis processing; when the analysis result exceeds a preset threshold, the auxiliary current converter is determined.
- the operation of the circuit can be stopped and processed, and the ground fault can be accurately and quickly judged for processing, and the safety and reliability of the electric locomotive operation can be effectively ensured, which is beneficial to the promotion and application of the market. .
- FIG. 1 is a schematic structural diagram of an auxiliary converter device according to an embodiment of the present invention.
- FIG. 2 is a schematic diagram of the principle of an auxiliary converter device according to an embodiment of the present invention.
- FIG. 1 is a schematic structural diagram of an auxiliary converter device according to an embodiment of the present invention
- FIG. 2 is a schematic diagram of a schematic diagram of an auxiliary converter device according to an embodiment of the present invention, and the present invention provides a schematic diagram of the present invention.
- An auxiliary current conversion device comprising: 1, 1 connected between a three-phase AC power source and the earth is connected with an auxiliary control unit 6; 1 comprises a plurality of auxiliary converters 2 connected in parallel with each other,
- Each auxiliary converter 2 is configured to perform a step-down process on the alternating current voltage outputted by the three-phase alternating current power source; and protect the circuit components when a ground fault occurs; detect the ground current value flowing through, and detect the detected The ground current value is sent to the auxiliary control unit 6;
- the auxiliary control unit 6 is configured to receive a ground current value sent by each auxiliary converter 2, and analyze the ground current value according to a preset standard threshold to determine whether the auxiliary current converter that detects the ground current value occurs Ground Fault.
- the specific structure of the auxiliary converter 2 and the auxiliary control unit 6 is not limited, and those skilled in the art can arbitrarily set according to the functions implemented by the same, such as setting the auxiliary converter 2 to include a buck and a protection resistor. And the current detecting device and the like, or may be configured as other structures, etc.; and for the auxiliary control unit 6, it may be set as a processor or a processing circuit, etc.; as long as the above functions can be implemented, no further description is provided herein.
- the method for analyzing the ground current value of the auxiliary control unit 6 is not limited, and those skilled in the art can set according to specific design requirements, such as setting the analysis method to directly analyze and judge according to the ground current value, such as The ground current value is compared with a preset standard current threshold; or the ground current value can be processed to analyze and compare the processed values, such as current rate, voltage value, etc., as long as it can be detected If the auxiliary current converter 2 of the ground current value has a ground fault, it is not here. Repeat.
- the three-phase AC power supply is not limited, and a common 380V three-phase AC power supply may be selected for power supply; in addition, the number of the specific auxiliary converters 2 included in 1 is not limited, and those skilled in the art It can be set according to specific application requirements, such as setting the number of auxiliary converters 2 to 3, 4, 5, etc., among them, more commonly, 1 can be set as four auxiliary in parallel with each other.
- the converter 2 is constructed and the four auxiliary converters 2 are evenly distributed in the circuit, so that the working state of the circuit is effectively detected and monitored.
- the auxiliary current conversion device detects the ground current value flowing through the auxiliary current conversion device and sends it to the auxiliary control unit for analysis processing; when the analysis result exceeds a preset threshold, the auxiliary current converter is determined.
- the operation of the circuit can be stopped and processed, and the ground fault can be accurately and quickly judged for processing, and the safety and reliability of the electric locomotive operation can be effectively ensured, which is beneficial to the promotion and application of the market. .
- each auxiliary converter 2 is Set to include:
- the transformer 3 is connected to the three-phase AC power source for performing a step-down process on the AC voltage outputted by the three-phase AC power source;
- the grounding resistance unit 4 is connected to the output end of the transformer 3 for protecting the circuit component when a ground fault occurs;
- the current sensor 5 has one end connected to the grounding resistance unit 4 and the other end connected to the ground for detecting a ground current value flowing through the grounding resistance unit 4 when a ground fault occurs, and transmitting the detected ground current value to the auxiliary control Unit 6.
- the specific type and type of the transformer 3 are not limited, and those skilled in the art may select different types of transformers 3 according to a specific circuit design, and the extent and scope of the step-down processing by the transformer 3 are not limited, and the field The technician can set according to the normal working voltage required by the actual circuit. In order to ensure that the components in the circuit are in a normal working state, it is preferable to set the voltage processed by the transformer 3 to be less than or equal to 36V. Within this range, it is possible to effectively ensure that the devices in the circuit can work normally.
- the above-mentioned voltage range for making the circuit device work normally can also be used as a preset standard ground voltage threshold range, if the operating voltage in the circuit Exceeding this standard ground voltage threshold range can indicate that the circuit is in an abnormal working state, and needs to be checked and processed in time to effectively ensure the stable reliability of the normal operation of the circuit.
- the grounding resistance unit 4 can be set.
- the structure may be configured as a structure in which a plurality of resistors are connected in parallel, or a bridge structure composed of a plurality of resistors, etc., wherein the degree of protection of the circuit components by the grounding resistor unit 4 is preferred.
- the grounding resistor unit 4 is configured to be composed of a first resistor 41 connected to the transformer 3 and a second resistor 42 connected in series with the first resistor 41.
- the second resistor 42 is connected to the current sensor 5 and is connected in series.
- the structure can make the current sensor 5 more accurately detect the ground current value flowing through the grounding resistance unit 4, which is more favorable for analyzing and judging the ground fault more accurately.
- the analysis method of the auxiliary control unit 6 is not limited in the technical solution. Among them, it is preferable that the auxiliary control unit 6 is based on a preset standard threshold.
- the ground current value is analyzed and set to specifically include:
- grounding resistance value of the grounding resistance unit 4 and obtain the grounding voltage value according to the grounding current value and the grounding resistance value, and compare and compare the grounding voltage value with a preset standard grounding voltage threshold value to determine the auxiliary of detecting the grounding voltage value. Whether the converter 2 has a ground fault.
- the specific structure of the auxiliary control unit 6 is not limited, for example, the auxiliary control unit 6 may be configured to be constituted by a single central processing unit, or the auxiliary control unit 6 may be configured to be constituted by a plurality of main control circuits, and the like.
- a person skilled in the art can arbitrarily set the ground current value or the ground voltage value according to the function of the specific implementation, and can determine the specific faulty auxiliary converter 2, This will not be repeated here.
- the auxiliary current conversion device detects the ground current value flowing through the grounding resistance according to the current sensor 5, thereby obtaining a potential difference between the connection point between the grounding resistance and the transformer 3 and the earth, and the ground current value and the potential There is a proportional relationship between the differences.
- the potential difference is larger, the ground current value is larger.
- the potential difference is smaller, the ground current value is smaller.
- the ground current value or the ground voltage value is detected to exceed the safe range, it is determined.
- the auxiliary converter 2 has a ground fault, which can stop the operation of the circuit and process it, so that the ground fault can be accurately and quickly judged for processing, and the safety and reliability of the electric locomotive operation can be effectively ensured.
- the auxiliary converter device is further configured to further include:
- the power unit 8 is connected to the vehicle dynamic control system 7 for inverting the direct current through the vehicle dynamic control system 7 into an alternating current;
- the filtering unit has one end connected to the output end of the power unit 8 and the other end connected to the transformer 3.
- the main function realized is to determine the driving state of the vehicle.
- the vehicle dynamic control system 7 can be set to include a wheel speed sensor disposed on the wheel for tracking each a state of motion of a wheel; a steering wheel angle sensor disposed on the steering wheel of the vehicle for sensing the angle of rotation of the steering wheel; a yaw rate sensor for recording all movement of the vehicle about a vertical axis; and a lateral acceleration sensor for detecting steering
- the magnitude of the centrifugal force during traveling; the wheel displacement sensor is used to measure the change of the relative position of the wheel and the body; of course, those skilled in the art can also include other devices according to the functions that need to be implemented; and the above for the vehicle dynamic control system 7
- the connection manner and the internal structure of the structure are not limited, and those skilled in the art can arbitrarily set according to the functions and specific design requirements of the implementation, and details are not described herein again.
- the specific internal structure of the power unit 8 and the filtering unit is not limited, and those skilled in the art can set according to the functions implemented by the same, for example, the power unit 8 can be set as an inverter or an inverter circuit, and the specific inverse The transformer or the inverter circuit may select a common device in the prior art; and for the filtering unit, the filtering unit may be set as a filter circuit including a capacitance and/or a reactance, etc., as long as the power unit 8 and the filtering unit can be implemented.
- the filtering unit is arranged to include a filter reactor 9 connected between the power unit 8 and the transformer 3, and a filter capacitor module 10 connected to the filter reactor 9 and connected in parallel with the transformer 3.
- the IGBT module 81 of the prior art is used for the IGBT module 81 in the power unit 8 described above, and the specific structure of the filter reactor 9 in the power unit 8 is not limited, and those skilled in the art can perform the circuit design according to the design requirements of the circuit. Arbitrarily set, in which the power reactor 8 inverts the direct current into three-phase alternating current, therefore, in order to facilitate the processing of the circuit, the filter reactor 9 is set to include the first reactor 91 connected to the three IGBT modules 81, respectively.
- the second reactor 92 and the third reactor 93 wherein the first reactor 91, the second reactor 92 and the third reactor 93 are connected to the three-phase alternating current after the inverter, thereby effectively ensuring the third
- the phase AC power is filtered to remove the burrs in the electrical signal, so that the obtained ground current value or ground voltage value is more stable and reliable.
- the specific structure of the filter capacitor module 10 in the filtering unit is not limited, and the filter capacitor module 10 may be configured to include a circuit structure in which a plurality of capacitors are connected in series or in parallel, in order to better filter the three-phase alternating current.
- the filter capacitor module 10 is configured as a bridge circuit structure composed of three capacitors, so that the filter reactor 9 and the filter capacitor module 10 can effectively filter the three-phase alternating current to ensure the input to the transformer 3
- the quality of the alternating current signal ensures the accuracy and reliability of the ground current or ground voltage.
- the technical solution mainly uses the grounding resistance unit 4 and the current sensor 5 to work together, and can timely and accurately detect the grounding current value.
- the auxiliary converter 2 is faulty for processing.
- the auxiliary converter 2 for detecting the ground fault in the present technical solution can adopt two methods, one is to analyze the ground current value flowing through the grounding resistance unit 4. Judgment; the other is to analyze and judge the grounding voltage value of the grounding resistance unit 4, the specific process is as follows:
- the auxiliary converter device is arranged to be connected to the three-phase AC power source by the four auxiliary converters 2, and when one of the auxiliary converters 2 has a ground fault, the grounding resistor unit 4 and the transformer 3 are used as At the potential point N, a potential difference occurs between the corresponding N and the ground, so that a ground current flows through the grounding resistance unit 4, and the ground current flowing through the grounding resistance unit 4 can be detected by the set current sensor 5.
- the current sensor 5 transmits the detected ground current value to the auxiliary control unit 6, and the auxiliary control unit 6 analyzes the ground current value.
- the auxiliary converter 2 corresponding to the ground current value has a ground fault.
- the auxiliary converter 2 in the circuit is stopped, and relevant processing is performed to eliminate the ground fault, and the ground fault is to be eliminated.
- the auxiliary converter 2 can be kept working; when the analysis result is that the detected ground current value does not exceed the preset standard ground current Value, it indicates that the current value corresponding to the ground auxiliary converter 2 to the normal working state.
- the auxiliary control unit 6 further obtains the resistance value of the grounding resistance unit 4, and then obtains the ground voltage value by the obtained ground current value and the resistance value, and the auxiliary control unit 6 determines the ground voltage value.
- the preset standard ground voltage threshold less than or equal to 36V (ie, the safe range)
- the auxiliary converter 2 corresponding to the ground voltage value is considered A ground fault occurs, at which time the auxiliary converter 2 in the circuit is stopped, and relevant processing is performed to eliminate the ground fault.
- the auxiliary converter 2 can continue to operate; when the analysis result is the ground voltage value Within the pre-set safety range value, the auxiliary converter 2 corresponding to the ground voltage value is considered to be in a normal operating state.
- a plurality of potential points may be set in the circuit, and a voltage value between the plurality of potential points may be detected. After analyzing the voltage values between the plurality of potential points, the specific position of the ground fault may be more accurately determined and The degree of ground fault, the specific implementation process will not be described here.
- the auxiliary converter device detects the ground current value flowing through the grounding resistance according to the current sensor 5, thereby obtaining a potential difference between the ground point resistance and the transformer N and the earth, and the ground current value and the potential There is a proportional relationship between the differences.
- the potential difference is larger, the ground current value is larger.
- the potential difference is smaller, the ground current value is smaller.
- the ground current value or the ground voltage value is detected to exceed the safe range, it is determined.
- the auxiliary converter 2 has a ground fault, which can stop the operation of the circuit and process it, so that the ground fault can be accurately and quickly judged for processing, and the safety and reliability of the electric locomotive operation can be effectively ensured.
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Abstract
An auxiliary converter device, comprising an auxiliary converter unit (1) connected between a three-phase alternating-current power supply and the ground. The auxiliary converter unit (1) is connected with an auxiliary control unit (6); and the auxiliary converter unit (1) comprises multiple auxiliary converters (2) that are mutually connected in parallel. The auxiliary converter device measures the value of a grounding current flowing through a grounding resistor unit (4) and sends the value to the auxiliary control unit (6) for analytical treatment; when the analysis result indicates that the value exceeds a preset threshold, it is determined that a grounding fault occurs to the auxiliary converters (2), the operation of the circuit can be stopped, and the fault is processed. In this way, a grounding fault can be accurately and quickly determined and processed, and operation safety and reliability of an electric locomotive can be effectively ensured.
Description
本发明涉及铁路车辆的变流装置,具体涉及一种辅助变流装置。The invention relates to a flow conversion device for a railway vehicle, and in particular to an auxiliary flow conversion device.
随着科学技术的不断进步,交通工具也越来越便利,目前很多城市为了节约建设成本和美化城市环境,建设了许多地铁线路,而随着地铁线路的不断增多,乘坐地铁的人数也越来越多,这就对地铁的整体性能提出了较高要求,其中,尤其是对于控制地铁线路的电传动***,电传动***与铁路车辆的运行安全息息相关。With the continuous advancement of science and technology, transportation is becoming more and more convenient. At present, many cities have built many subway lines in order to save construction costs and beautify the urban environment. With the increasing number of subway lines, the number of people taking the subway is also coming. The more this, the higher the overall performance of the subway, which, especially for the electric drive system to control the subway line, the electric drive system and the safety of the railway vehicle are closely related.
由于轨道交通的电传动***具有高电压、大电流的特点,因此,保证传动***的正常工作是保证机车可靠运行的前提;电力机车在运用过程中可能由于电缆老化、振动摩擦等造成主电路发生接地。一般而言,一点接地并不会带来什么危害,对***的正常工作不会有太大的影响,但两点或多点接地,就可能产生很大的短路电流,造成电力机车的电传动***部件的烧损,严重情况下甚至会导致机破。Because the electric drive system of rail transit has the characteristics of high voltage and high current, ensuring the normal operation of the drive system is the premise to ensure the reliable operation of the locomotive; the main circuit may occur due to cable aging, vibration and friction during the operation of the electric locomotive. Ground. In general, a little grounding will not cause any harm, and will not have much impact on the normal operation of the system. However, if two or more points are grounded, a large short-circuit current may be generated, resulting in an electric drive of the electric locomotive. Burning of system components can even lead to machine breakage in severe cases.
因此,现在亟需一种具有电压型接地检测技术的辅助变流装置,可以准确、迅速地对接地故障进行判断,以便处理,进而保证电力机车运行的安全可靠性。Therefore, there is an urgent need for an auxiliary converter device with a voltage type grounding detection technology, which can accurately and quickly determine the ground fault for processing, thereby ensuring the safety and reliability of the electric locomotive operation.
发明内容Summary of the invention
本发明提供一种辅助变流装置,可以准确、迅速地对接地故障进行判断,以便处理,进而保证电力机车运行的安全可靠性。The invention provides an auxiliary current changing device, which can accurately and quickly judge the ground fault for processing, thereby ensuring the safety and reliability of the electric locomotive operation.
本发明是为了提供一种辅助变流装置,包括连接在三相交流电源和大地之间的辅助变流单元,所述辅助变流单元连接有辅助控制单元;所述辅助变流单元包括若干个相互并联的辅助变流器;The present invention is to provide an auxiliary current converting device comprising an auxiliary converter unit connected between a three-phase AC power source and a ground, the auxiliary converter unit being connected with an auxiliary control unit; the auxiliary converter unit comprising a plurality of Auxiliary converters connected in parallel with each other;
每个辅助变流器,用于对所述三相交流电源输出的交流电电压进行
降压处理;并在发生接地故障时,对电路元件进行保护;检测流过的接地电流值,并将检测到的接地电流值发送至辅助控制单元;Each auxiliary converter is configured to perform an alternating current voltage outputted by the three-phase alternating current power source
Step-down processing; and in the event of a ground fault, protect the circuit components; detect the value of the ground current flowing, and send the detected ground current value to the auxiliary control unit;
所述辅助控制单元,用于接收每个辅助变流器发送的接地电流值,并根据预先设置的标准阈值对所述接地电流值进行分析,以判断检测到该接地电流值的辅助变流器是否发生接地故障。The auxiliary control unit is configured to receive a ground current value sent by each auxiliary converter, and analyze the ground current value according to a preset standard threshold to determine an auxiliary converter that detects the ground current value. Whether a ground fault has occurred.
如上所述的辅助变流装置,所述辅助变流器具体包括:The auxiliary converter device as described above, the auxiliary converter specifically includes:
变压器,与所述三相交流电源相连接,用于对所述三相交流电源输出的交流电电压进行降压处理;a transformer connected to the three-phase AC power source for performing a step-down process on an AC voltage output by the three-phase AC power source;
接地电阻单元,与所述变压器的输出端相连接,用于在发生接地故障时,对电路元件进行保护;a grounding resistance unit connected to the output end of the transformer for protecting the circuit component when a ground fault occurs;
电流传感器,一端与所述接地电阻单元,另一端与大地相连接,用于在发生接地故障时,检测流过接地电阻单元的接地电流值,并将检测到的接地电流值发送至辅助控制单元。a current sensor having one end connected to the grounding resistance unit and the other end connected to the ground for detecting a ground current value flowing through the grounding resistance unit when a ground fault occurs, and transmitting the detected ground current value to the auxiliary control unit .
如上所述的辅助变流装置,所述辅助控制单元根据预先设置的标准阈值对所述接地电流值进行分析,具体包括:The auxiliary current conversion device, as described above, the auxiliary control unit analyzes the ground current value according to a preset standard threshold, which specifically includes:
将所述接地电流值与预先设置的标准接地电流阈值进行分析比较,以判断检测到该接地电流值的辅助变流器是否发生接地故障;或者,And comparing and comparing the ground current value with a preset standard ground current threshold to determine whether the auxiliary current transformer that detects the ground current value has a ground fault; or
获取所述接地电阻单元的接地电阻值,并根据所述接地电流值和所述接地电阻值得到接地电压值,将所述接地电压值与预先设置的标准接地电压阈值进行分析比较,以判断检测到该接地电压值的辅助变流器是否发生接地故障。Obtaining a grounding resistance value of the grounding resistance unit, and obtaining a grounding voltage value according to the grounding current value and the grounding resistance value, and comparing and comparing the grounding voltage value with a preset standard grounding voltage threshold to determine the detection. Whether the auxiliary converter to the ground voltage value has a ground fault.
如上所述的辅助变流装置,还包括:The auxiliary converter device as described above further includes:
功率单元,与车辆动态控制***相连接,用于将经过车辆动态控制***的直流电逆变为交流电;a power unit connected to the vehicle dynamic control system for inverting direct current through the vehicle dynamic control system to alternating current;
滤波单元,一端与所述功率单元的输出端相连接,另一端与所述变压器相连接。The filtering unit has one end connected to the output end of the power unit and the other end connected to the transformer.
如上所述的辅助变流装置,所述功率单元为由三个IGBT模块构成的桥式电路结构。In the auxiliary converter device as described above, the power unit is a bridge circuit structure composed of three IGBT modules.
如上所述的辅助变流装置,所述滤波单元包括连接于所述功率单元和所述变压器之间的滤波电抗器以及与所述滤波电抗器相连接、且与所
述变压器相并联的滤波电容模块。In the auxiliary converter device as described above, the filtering unit includes a filter reactor connected between the power unit and the transformer, and is connected to the filter reactor, and
A filter capacitor module in which the transformers are connected in parallel.
如上所述的辅助变流装置,所述滤波电抗器包括分别与所述三个IGBT模块相连接的第一电抗器、第二电抗器和第三电抗器。The auxiliary converter device as described above, the filter reactor includes a first reactor, a second reactor, and a third reactor respectively connected to the three IGBT modules.
如上所述的辅助变流装置,所述滤波电容模块为由三个电容构成的桥式电路结构。In the auxiliary converter device as described above, the filter capacitor module is a bridge circuit structure composed of three capacitors.
如上所述的辅助变流装置,所述预先设置的标准接地电压阈值为小于或等于36V。In the auxiliary converter device as described above, the preset standard ground voltage threshold is less than or equal to 36V.
如上所述的辅助变流装置,所述接地电阻单元由与所述变压器相连接的第一电阻以及与所述第一电阻相串联的第二电阻构成,所述第二电阻与所述电流传感器相连接。The auxiliary current converting device as described above, wherein the grounding resistance unit is constituted by a first resistor connected to the transformer and a second resistor connected in series with the first resistor, the second resistor and the current sensor Connected.
本发明提供的辅助变流装置,根据辅助变流装置检测流经的接地电流值,并发送至辅助控制单元进行分析处理;当分析结果为超过预先设置的阈值时,则确定该辅助变流器发生接地故障,可以停止电路的运行,对其进行处理,进而实现了可以准确、迅速地对接地故障进行判断,以便处理,有效的保证电力机车运行的安全可靠性,有利于市场的推广与应用。The auxiliary current conversion device provided by the present invention detects the ground current value flowing through the auxiliary current conversion device and sends it to the auxiliary control unit for analysis processing; when the analysis result exceeds a preset threshold, the auxiliary current converter is determined. When a ground fault occurs, the operation of the circuit can be stopped and processed, and the ground fault can be accurately and quickly judged for processing, and the safety and reliability of the electric locomotive operation can be effectively ensured, which is beneficial to the promotion and application of the market. .
图1为本发明实施例所给出的辅助变流装置的结构示意图;1 is a schematic structural diagram of an auxiliary converter device according to an embodiment of the present invention;
图2为本发明实施例所给出的辅助变流装置的原理示意图。FIG. 2 is a schematic diagram of the principle of an auxiliary converter device according to an embodiment of the present invention.
图中:In the picture:
1、辅助变流单元; 2、辅助变流器;1. Auxiliary converter unit; 2. Auxiliary converter;
3、变压器; 4、接地电阻单元;3, transformer; 4, grounding resistance unit;
41、第一电阻; 42、第二电阻;41, a first resistor; 42, a second resistor;
5、电流传感器; 6、辅助控制单元;5, current sensor; 6, auxiliary control unit;
7、车辆动态控制***; 8、功率单元;7. Vehicle dynamic control system; 8. Power unit;
81、IGBT模块; 9、滤波电抗器;81, IGBT module; 9, filter reactor;
91、第一电抗器; 92、第二电抗器;91, a first reactor; 92, a second reactor;
93、第三电抗器; 10、滤波电容模块。
93, the third reactor; 10, filter capacitor module.
下面结合附图和实施例,对本发明的具体实施方式作进一步详细描述。以下实例用于说明本发明,但不用来限制本发明的范围。The specific embodiments of the present invention are further described in detail below with reference to the drawings and embodiments. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
图1为本发明实施例所给出的辅助变流装置的结构示意图;图2为本发明实施例所给出的辅助变流装置的原理示意图,参考附图1-2可知,本发明提供了一种辅助变流装置,包括连接在三相交流电源和大地之间的1,1连接有辅助控制单元6;1包括若干个相互并联的辅助变流器2,1 is a schematic structural diagram of an auxiliary converter device according to an embodiment of the present invention; FIG. 2 is a schematic diagram of a schematic diagram of an auxiliary converter device according to an embodiment of the present invention, and the present invention provides a schematic diagram of the present invention. An auxiliary current conversion device comprising: 1, 1 connected between a three-phase AC power source and the earth is connected with an auxiliary control unit 6; 1 comprises a plurality of auxiliary converters 2 connected in parallel with each other,
每个辅助变流器2,用于对三相交流电源输出的交流电电压进行降压处理;并在发生接地故障时,对电路元件进行保护;检测流过的接地电流值,并将检测到的接地电流值发送至辅助控制单元6;Each auxiliary converter 2 is configured to perform a step-down process on the alternating current voltage outputted by the three-phase alternating current power source; and protect the circuit components when a ground fault occurs; detect the ground current value flowing through, and detect the detected The ground current value is sent to the auxiliary control unit 6;
辅助控制单元6,用于接收每个辅助变流器2发送的接地电流值,并根据预先设置的标准阈值对接地电流值进行分析,以判断检测到该接地电流值的辅助变流器是否发生接地故障。The auxiliary control unit 6 is configured to receive a ground current value sent by each auxiliary converter 2, and analyze the ground current value according to a preset standard threshold to determine whether the auxiliary current converter that detects the ground current value occurs Ground Fault.
其中,对于辅助变流器2和辅助控制单元6的具体结构不做限定,本领域技术人员可以根据其实现的功能进行任意设置,如将辅助变流器2设置为包括降压器、保护电阻以及电流检测装置等等,或者也可以设置为其他结构等等;而对于辅助控制单元6而言,可以设置为处理器或者处理电路等等;只要能够实现上述功能即可,在此不再赘述;此外,对于辅助控制单元6的对接地电流值进行分析的方法不做限定,本领域技术人员可以根据具体的设计需求进行设置,如将分析方法设置为直接根据接地电流值进行分析判断,如将接地电流值与预先设置的标准电流阈值进行分析比较;或者可以通过对接地电流值进行处理后,对处理后的数值进行分析比较,如电流速率、电压值等等,只要能够可以判断检测到该接地电流值的辅助变流器2是否发生接地故障即可,在此不再赘述。The specific structure of the auxiliary converter 2 and the auxiliary control unit 6 is not limited, and those skilled in the art can arbitrarily set according to the functions implemented by the same, such as setting the auxiliary converter 2 to include a buck and a protection resistor. And the current detecting device and the like, or may be configured as other structures, etc.; and for the auxiliary control unit 6, it may be set as a processor or a processing circuit, etc.; as long as the above functions can be implemented, no further description is provided herein. In addition, the method for analyzing the ground current value of the auxiliary control unit 6 is not limited, and those skilled in the art can set according to specific design requirements, such as setting the analysis method to directly analyze and judge according to the ground current value, such as The ground current value is compared with a preset standard current threshold; or the ground current value can be processed to analyze and compare the processed values, such as current rate, voltage value, etc., as long as it can be detected If the auxiliary current converter 2 of the ground current value has a ground fault, it is not here. Repeat.
此外,对于三相交流电源不做具体限定,可以选择常用的380V的三相交流电源进行供电;此外,对于1中包括的具体的辅助变流器2的个数不做限定,本领域技术人员可以根据具体的应用需求进行设置,如将辅助变流器2的个数设置为3个、4个、5个等等,其中,较为常用的,可以将1设置为由四个相互并联的辅助变流器2构成,并使得四个辅助变流器2均匀分布在电路中,这样有效的对电路的工作状态进行检测并监控。
In addition, the three-phase AC power supply is not limited, and a common 380V three-phase AC power supply may be selected for power supply; in addition, the number of the specific auxiliary converters 2 included in 1 is not limited, and those skilled in the art It can be set according to specific application requirements, such as setting the number of auxiliary converters 2 to 3, 4, 5, etc., among them, more commonly, 1 can be set as four auxiliary in parallel with each other. The converter 2 is constructed and the four auxiliary converters 2 are evenly distributed in the circuit, so that the working state of the circuit is effectively detected and monitored.
本发明提供的辅助变流装置,根据辅助变流装置检测流经的接地电流值,并发送至辅助控制单元进行分析处理;当分析结果为超过预先设置的阈值时,则确定该辅助变流器发生接地故障,可以停止电路的运行,对其进行处理,进而实现了可以准确、迅速地对接地故障进行判断,以便处理,有效的保证电力机车运行的安全可靠性,有利于市场的推广与应用。The auxiliary current conversion device provided by the present invention detects the ground current value flowing through the auxiliary current conversion device and sends it to the auxiliary control unit for analysis processing; when the analysis result exceeds a preset threshold, the auxiliary current converter is determined. When a ground fault occurs, the operation of the circuit can be stopped and processed, and the ground fault can be accurately and quickly judged for processing, and the safety and reliability of the electric locomotive operation can be effectively ensured, which is beneficial to the promotion and application of the market. .
在上述实施例的基础上,继续参考附图1-2可知,本技术方案中对于辅助变流器2的具体内部结构不做限定,其中,较为优选的,将每个辅助变流器2均设置为包括:On the basis of the above-mentioned embodiments, with reference to FIG. 1-2, the specific internal structure of the auxiliary converter 2 is not limited in the technical solution, and it is preferable that each auxiliary converter 2 is Set to include:
变压器3,与三相交流电源相连接,用于对三相交流电源输出的交流电电压进行降压处理;The transformer 3 is connected to the three-phase AC power source for performing a step-down process on the AC voltage outputted by the three-phase AC power source;
接地电阻单元4,与变压器3的输出端相连接,用于在发生接地故障时,对电路元件进行保护;The grounding resistance unit 4 is connected to the output end of the transformer 3 for protecting the circuit component when a ground fault occurs;
电流传感器5,一端与接地电阻单元4,另一端与大地相连接,用于在发生接地故障时,检测流过接地电阻单元4的接地电流值,并将检测到的接地电流值发送至辅助控制单元6。The current sensor 5 has one end connected to the grounding resistance unit 4 and the other end connected to the ground for detecting a ground current value flowing through the grounding resistance unit 4 when a ground fault occurs, and transmitting the detected ground current value to the auxiliary control Unit 6.
其中,对于变压器3具体的型号和类型不做限定,本领域技术人员可以根据具体的电路设计选择不同类型的变压器3,并且对于通过变压器3进行降压处理的程度和范围不做限定,本领域技术人员可以根据实际电路所需要的正常工作电压进行设置,其中,为了保证电路中个元器件处于正常的工作状态,较为优选的,将经过变压器3处理后的电压设置在小于或等于36V的范围内,在这个范围内,可以有效的保证电路中的器件可以正常的工作,因此,也可以将上述使得电路器件正常工作的电压范围作为预先设置的标准接地电压阈值范围,若电路中的工作电压超出这个标准接地电压阈值范围,则可以说明电路处于非正常工作状态,需要及时检查并进行处理等措施,进而有效的保证了电路正常工作的稳定可靠性。The specific type and type of the transformer 3 are not limited, and those skilled in the art may select different types of transformers 3 according to a specific circuit design, and the extent and scope of the step-down processing by the transformer 3 are not limited, and the field The technician can set according to the normal working voltage required by the actual circuit. In order to ensure that the components in the circuit are in a normal working state, it is preferable to set the voltage processed by the transformer 3 to be less than or equal to 36V. Within this range, it is possible to effectively ensure that the devices in the circuit can work normally. Therefore, the above-mentioned voltage range for making the circuit device work normally can also be used as a preset standard ground voltage threshold range, if the operating voltage in the circuit Exceeding this standard ground voltage threshold range can indicate that the circuit is in an abnormal working state, and needs to be checked and processed in time to effectively ensure the stable reliability of the normal operation of the circuit.
此外,对于接地电阻单元4的具体内部结构以及其具体电阻值不做限定,本领域技术人员可以根据不同的电路采用不同结构并且不同电阻值的接地电阻单元4,如可以将接地电阻单元4设置为包括若干个电阻串联
所构成的结构,也可以设置为由若干个电阻并联构成的结构,或者是由若干个电阻构成的桥式结构等等,其中,为了保证接地电阻单元4对电路元件进行保护的程度,较为优选的,将接地电阻单元4设置为由与变压器3相连接的第一电阻41以及与第一电阻41相串联的第二电阻42构成,其中,第二电阻42与电流传感器5相连接,采用串联的结构可以使得电流传感器5更加准确的检测流经接地电阻单元4的接地电流值,有利于更准确对接地故障进行分析和判断。In addition, for the specific internal structure of the grounding resistance unit 4 and its specific resistance value, those skilled in the art can use the grounding resistance unit 4 with different structures and different resistance values according to different circuits, for example, the grounding resistance unit 4 can be set. To include several resistors in series
The structure may be configured as a structure in which a plurality of resistors are connected in parallel, or a bridge structure composed of a plurality of resistors, etc., wherein the degree of protection of the circuit components by the grounding resistor unit 4 is preferred. The grounding resistor unit 4 is configured to be composed of a first resistor 41 connected to the transformer 3 and a second resistor 42 connected in series with the first resistor 41. The second resistor 42 is connected to the current sensor 5 and is connected in series. The structure can make the current sensor 5 more accurately detect the ground current value flowing through the grounding resistance unit 4, which is more favorable for analyzing and judging the ground fault more accurately.
在上述实施例的基础上,继续参考附图1-2可知,本技术方案中对于辅助控制单元6的分析方法不做限定,其中,较为优选的,将辅助控制单元6根据预先设置的标准阈值对接地电流值进行分析,设置为具体包括:On the basis of the above-mentioned embodiments, with reference to FIG. 1-2, the analysis method of the auxiliary control unit 6 is not limited in the technical solution. Among them, it is preferable that the auxiliary control unit 6 is based on a preset standard threshold. The ground current value is analyzed and set to specifically include:
将接地电流值与预先设置的标准接地电流阈值进行分析比较,以判断检测到该接地电流值的辅助变流器2是否发生接地故障;或者,Comparing and comparing the ground current value with a preset standard ground current threshold to determine whether the auxiliary converter 2 detecting the ground current value has a ground fault; or
获取接地电阻单元4的接地电阻值,并根据接地电流值和接地电阻值得到接地电压值,将接地电压值与预先设置的标准接地电压阈值进行分析比较,以判断检测到该接地电压值的辅助变流器2是否发生接地故障。Obtain the grounding resistance value of the grounding resistance unit 4, and obtain the grounding voltage value according to the grounding current value and the grounding resistance value, and compare and compare the grounding voltage value with a preset standard grounding voltage threshold value to determine the auxiliary of detecting the grounding voltage value. Whether the converter 2 has a ground fault.
其中,对于辅助控制单元6的具体结构不做限定,如可以将辅助控制单元6设置为由一单独的中央处理器构成,或者是将辅助控制单元6设置为由若干个主控电路构成等等,本领域技术人员可以根据其具体实现的功能对其进行任意设置,只要能够实现对接地电流值或者接地电压值进行分析判断,进而判断出具体的发生故障的辅助变流器2即可,在此不再赘述。The specific structure of the auxiliary control unit 6 is not limited, for example, the auxiliary control unit 6 may be configured to be constituted by a single central processing unit, or the auxiliary control unit 6 may be configured to be constituted by a plurality of main control circuits, and the like. A person skilled in the art can arbitrarily set the ground current value or the ground voltage value according to the function of the specific implementation, and can determine the specific faulty auxiliary converter 2, This will not be repeated here.
本发明提供的辅助变流装置,根据电流传感器5检测流经接地电阻的接地电流值,进而可以获得接地电阻与变压器3之间的连接点与大地之间的电位差,并且接地电流值与电位差之间存在比例关系,当电位差越大时,接地电流值越大;当电位差越小时,接地电流值越小;当检测到接地电流值或接地电压值超过安全范围时,则确定该辅助变流器2发生接地故障,可以停止电路的运行,对其进行处理,进而实现了可以准确、迅速地对接地故障进行判断,以便处理,有效的保证电力机车运行的安全可靠性,有利于市场的推广与应用。The auxiliary current conversion device provided by the invention detects the ground current value flowing through the grounding resistance according to the current sensor 5, thereby obtaining a potential difference between the connection point between the grounding resistance and the transformer 3 and the earth, and the ground current value and the potential There is a proportional relationship between the differences. When the potential difference is larger, the ground current value is larger. When the potential difference is smaller, the ground current value is smaller. When the ground current value or the ground voltage value is detected to exceed the safe range, it is determined. The auxiliary converter 2 has a ground fault, which can stop the operation of the circuit and process it, so that the ground fault can be accurately and quickly judged for processing, and the safety and reliability of the electric locomotive operation can be effectively ensured. Market promotion and application.
在上述实施例的基础上,继续参考附图1-2可知,为了更加清楚的了
解本辅助变流装置的具体工作过程,将该辅助变流装置设置为还包括:Based on the above embodiments, with reference to FIGS. 1-2, it is clearer for clarity.
To solve the specific working process of the auxiliary converter device, the auxiliary converter device is further configured to further include:
功率单元8,与车辆动态控制***7相连接,用于将经过车辆动态控制***7的直流电逆变为交流电;The power unit 8 is connected to the vehicle dynamic control system 7 for inverting the direct current through the vehicle dynamic control system 7 into an alternating current;
滤波单元,一端与功率单元8的输出端相连接,另一端与变压器3相连接。The filtering unit has one end connected to the output end of the power unit 8 and the other end connected to the transformer 3.
其中,对于车辆动态控制***7而言,其主要实现的功能为确定车辆的驾驶状态,一般情况下,可以将车辆动态控制***7设置为包括设置于车轮上的车轮转速传感器,用来跟踪每一车轮的运动状态;设置于汽车方向盘上的方向盘转角传感器,用来传感方向盘的转角;横摆角速度传感器,用来记录汽车绕垂直轴线转动的所有运动;侧向加速度传感器,用来检测转向行驶时离心力的大小;车轮位移传感器,用来测量车轮和车身相对位置的变化;当然的,本领域技术人员还可以根据其需要实现的功能设置包括其他装置;而对于车辆动态控制***7的上述结构的连接方式和内部结构不做限定,本领域技术人员可以根据其实现的功能和具体的设计需求进行任意设置,在此不再赘述。Wherein, for the vehicle dynamic control system 7, the main function realized is to determine the driving state of the vehicle. In general, the vehicle dynamic control system 7 can be set to include a wheel speed sensor disposed on the wheel for tracking each a state of motion of a wheel; a steering wheel angle sensor disposed on the steering wheel of the vehicle for sensing the angle of rotation of the steering wheel; a yaw rate sensor for recording all movement of the vehicle about a vertical axis; and a lateral acceleration sensor for detecting steering The magnitude of the centrifugal force during traveling; the wheel displacement sensor is used to measure the change of the relative position of the wheel and the body; of course, those skilled in the art can also include other devices according to the functions that need to be implemented; and the above for the vehicle dynamic control system 7 The connection manner and the internal structure of the structure are not limited, and those skilled in the art can arbitrarily set according to the functions and specific design requirements of the implementation, and details are not described herein again.
此外,对于功率单元8和滤波单元的具体内部结构不做限定,本领域技术人员可以根据其实现的功能进行设置,如可以将功率单元8设置为逆变器或逆变电路,而具体的逆变器或逆变电路可以选择现有技术中的常用装置即可;而对于滤波单元,可以将滤波单元设置为包括电容和/电抗的滤波电路等等,只要能够使得功率单元8和滤波单元实现上述效果即可;其中,为了配合电路中的正常工作电压,并能够保证上述功率单元8和滤波单元的实现效果,较为优选的,将功率单元8设置为由三个IGBT模块81构成的桥式电路结构;将滤波单元设置为包括连接于功率单元8和变压器3之间的滤波电抗器9以及与滤波电抗器9相连接、且与变压器3相并联的滤波电容模块10。In addition, the specific internal structure of the power unit 8 and the filtering unit is not limited, and those skilled in the art can set according to the functions implemented by the same, for example, the power unit 8 can be set as an inverter or an inverter circuit, and the specific inverse The transformer or the inverter circuit may select a common device in the prior art; and for the filtering unit, the filtering unit may be set as a filter circuit including a capacitance and/or a reactance, etc., as long as the power unit 8 and the filtering unit can be implemented. The above effects are sufficient; among them, in order to match the normal operating voltage in the circuit and to ensure the realization effect of the power unit 8 and the filtering unit, it is preferable to set the power unit 8 as a bridge composed of three IGBT modules 81. Circuit structure; the filtering unit is arranged to include a filter reactor 9 connected between the power unit 8 and the transformer 3, and a filter capacitor module 10 connected to the filter reactor 9 and connected in parallel with the transformer 3.
对于上述构成功率单元8中的IGBT模块81采用现有技术中的IGBT模块81,而对于功率单元8中的滤波电抗器9的具体结构不做限定,本领域技术人员可以根据电路的设计需求进行任意设置,其中,由于功率单元8将直流电逆变为三相交流电,因此,为了方便电路的处理过程,将滤波电抗器9设置为包括分别与三个IGBT模块81相连接的第一电抗器91、
第二电抗器92和第三电抗器93,其中,第一电抗器91、第二电抗器92和第三电抗器93是与逆变后的三相交流电进行连接,进而有效的保证了对三相交流电进行整体滤波,去除电信号中的毛刺,使得获得的接地电流值或接地电压值会更加稳定可靠。The IGBT module 81 of the prior art is used for the IGBT module 81 in the power unit 8 described above, and the specific structure of the filter reactor 9 in the power unit 8 is not limited, and those skilled in the art can perform the circuit design according to the design requirements of the circuit. Arbitrarily set, in which the power reactor 8 inverts the direct current into three-phase alternating current, therefore, in order to facilitate the processing of the circuit, the filter reactor 9 is set to include the first reactor 91 connected to the three IGBT modules 81, respectively. ,
The second reactor 92 and the third reactor 93, wherein the first reactor 91, the second reactor 92 and the third reactor 93 are connected to the three-phase alternating current after the inverter, thereby effectively ensuring the third The phase AC power is filtered to remove the burrs in the electrical signal, so that the obtained ground current value or ground voltage value is more stable and reliable.
此外,对于上述滤波单元中的滤波电容模块10的具体结构不做限定,可以将滤波电容模块10设置为包括若干个电容串联或并联构成的电路结构,其中,为了更好对三相交流电进行滤波处理,将滤波电容模块10设置为由三个电容构成的桥式电路结构,这样通过滤波电抗器9和滤波电容模块10可以有效的对三相交流电进行滤波处理,保证了输入到变压器3的三相交流电信号的质量,进而可以保证获取接地电流值或接地电压值的准确性和可靠度。In addition, the specific structure of the filter capacitor module 10 in the filtering unit is not limited, and the filter capacitor module 10 may be configured to include a circuit structure in which a plurality of capacitors are connected in series or in parallel, in order to better filter the three-phase alternating current. The filter capacitor module 10 is configured as a bridge circuit structure composed of three capacitors, so that the filter reactor 9 and the filter capacitor module 10 can effectively filter the three-phase alternating current to ensure the input to the transformer 3 The quality of the alternating current signal, in turn, ensures the accuracy and reliability of the ground current or ground voltage.
具体应用时,本技术方案主要是通过接地电阻单元4和电流传感器5共同作用,可以及时准确的检测到接地电流值,在有多台辅助变流器2进行工作时,可以准确分辨是那一台辅助变流器2出现故障,以便进行处理,其中,本技术方案中对于检测接地故障的辅助变流器2可以采用两种方式,一种是对流过接地电阻单元4的接地电流值进行分析判断;另一种是对接地电阻单元4的接地电压值进行分析判断,具体的过程如下:In the specific application, the technical solution mainly uses the grounding resistance unit 4 and the current sensor 5 to work together, and can timely and accurately detect the grounding current value. When there are multiple auxiliary converters 2, it can accurately distinguish which one. The auxiliary converter 2 is faulty for processing. The auxiliary converter 2 for detecting the ground fault in the present technical solution can adopt two methods, one is to analyze the ground current value flowing through the grounding resistance unit 4. Judgment; the other is to analyze and judge the grounding voltage value of the grounding resistance unit 4, the specific process is as follows:
采用对接地电流值进行分析的操作过程:The operation process of analyzing the ground current value:
将该辅助变流装置设置为由四台辅助变流器2与三相交流电源进行连接,当其中某一台辅助变流器2出现接地故障时,将接地电阻单元4与变压器3之间作为电位点N,会在相应的N与大地之间出现电位差,进而使得接地电阻单元4上就会有接地电流流过,通过设置的电流传感器5可以检测到流过接地电阻单元4的接地电流值,电流传感器5将检测到的接地电流值传递给辅助控制单元6,辅助控制单元6对接地电流值进行分析处理,当分析结果为检测到接地电流值超过预先设置的标准接地电流阈值(即安全范围)时,则认为该接地电流值所对应的辅助变流器2发生接地故障,此时使得电路中的辅助变流器2停止工作,进行相关处理,以排除接地故障,待排除接地故障后,可以使得辅助变流器2继续工作;当分析结果为检测到的接地电流值没有超过预先设置的标准接地电流阈值时,则说明该接地电流值所对应的辅助变流器2为正常工作状态。
The auxiliary converter device is arranged to be connected to the three-phase AC power source by the four auxiliary converters 2, and when one of the auxiliary converters 2 has a ground fault, the grounding resistor unit 4 and the transformer 3 are used as At the potential point N, a potential difference occurs between the corresponding N and the ground, so that a ground current flows through the grounding resistance unit 4, and the ground current flowing through the grounding resistance unit 4 can be detected by the set current sensor 5. The current sensor 5 transmits the detected ground current value to the auxiliary control unit 6, and the auxiliary control unit 6 analyzes the ground current value. When the analysis result is that the ground current value is detected to exceed the preset standard ground current threshold (ie, In the safety range, it is considered that the auxiliary converter 2 corresponding to the ground current value has a ground fault. At this time, the auxiliary converter 2 in the circuit is stopped, and relevant processing is performed to eliminate the ground fault, and the ground fault is to be eliminated. After that, the auxiliary converter 2 can be kept working; when the analysis result is that the detected ground current value does not exceed the preset standard ground current Value, it indicates that the current value corresponding to the ground auxiliary converter 2 to the normal working state.
采用对接地电压值进行分析的操作过程:The operation process of analyzing the ground voltage value:
在上述操作过程的基础上,辅助控制单元6进一步获取接地电阻单元4的电阻值,进而通过获取的接地电流值和电阻值,即可获得接地电压值,并且辅助控制单元6将该接地电压值与预先设置的标准接地电压阈值小于或等于36V(即安全范围)进行分析比较,当分析结果为接地电压值超出预先设置的安全范围值,则认为该接地电压值所对应的辅助变流器2发生接地故障,此时使得电路中的辅助变流器2停止工作,进行相关处理,以排除接地故障,待排除接地故障后,可以使得辅助变流器2继续工作;当分析结果为接地电压值在预先设置的安全范围值之内,则认为该接地电压值所对应的辅助变流器2为正常工作状态。On the basis of the above operation process, the auxiliary control unit 6 further obtains the resistance value of the grounding resistance unit 4, and then obtains the ground voltage value by the obtained ground current value and the resistance value, and the auxiliary control unit 6 determines the ground voltage value. Compared with the preset standard ground voltage threshold less than or equal to 36V (ie, the safe range), when the analysis result is that the ground voltage value exceeds the preset safety range value, the auxiliary converter 2 corresponding to the ground voltage value is considered A ground fault occurs, at which time the auxiliary converter 2 in the circuit is stopped, and relevant processing is performed to eliminate the ground fault. After the ground fault is removed, the auxiliary converter 2 can continue to operate; when the analysis result is the ground voltage value Within the pre-set safety range value, the auxiliary converter 2 corresponding to the ground voltage value is considered to be in a normal operating state.
另外,也可以将电路中设置多个电位点,检测多个电位点之间的电压值,经过对多个电位点之间的电压值进行分析,可以更加准确的判断出接地故障的具***置以及接地故障的程度,具体的实施过程在此不再赘述。In addition, a plurality of potential points may be set in the circuit, and a voltage value between the plurality of potential points may be detected. After analyzing the voltage values between the plurality of potential points, the specific position of the ground fault may be more accurately determined and The degree of ground fault, the specific implementation process will not be described here.
本发明提供的辅助变流装置,根据电流传感器5检测流经接地电阻的接地电流值,进而可以获得接地电阻与变压器3之间的N点与大地之间的电位差,并且接地电流值与电位差之间存在比例关系,当电位差越大时,接地电流值越大;当电位差越小时,接地电流值越小;当检测到接地电流值或接地电压值超过安全范围时,则确定该辅助变流器2发生接地故障,可以停止电路的运行,对其进行处理,进而实现了可以准确、迅速地对接地故障进行判断,以便处理,有效的保证电力机车运行的安全可靠性,有利于市场的推广与应用。The auxiliary converter device provided by the present invention detects the ground current value flowing through the grounding resistance according to the current sensor 5, thereby obtaining a potential difference between the ground point resistance and the transformer N and the earth, and the ground current value and the potential There is a proportional relationship between the differences. When the potential difference is larger, the ground current value is larger. When the potential difference is smaller, the ground current value is smaller. When the ground current value or the ground voltage value is detected to exceed the safe range, it is determined. The auxiliary converter 2 has a ground fault, which can stop the operation of the circuit and process it, so that the ground fault can be accurately and quickly judged for processing, and the safety and reliability of the electric locomotive operation can be effectively ensured. Market promotion and application.
最后应说明的是:以上各实施例仅用以说明本发明的技术方案,而非对其限制;尽管参照前述各实施例对本发明进行了详细的说明,本领域的普通技术人员应当理解:其依然可以对前述各实施例所记载的技术方案进行修改,或者对其中部分或者全部技术特征进行等同替换;而这些修改或者替换,并不使相应技术方案的本质脱离本发明各实施例技术方案的范围。
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, and are not intended to be limiting; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that The technical solutions described in the foregoing embodiments may be modified, or some or all of the technical features may be equivalently replaced; and the modifications or substitutions do not deviate from the technical solutions of the embodiments of the present invention. range.
Claims (10)
- 一种辅助变流装置,其特征在于,包括连接在三相交流电源和大地之间的辅助变流单元,所述辅助变流单元连接有辅助控制单元;所述辅助变流单元包括若干个相互并联的辅助变流器;An auxiliary current conversion device, comprising: an auxiliary converter unit connected between a three-phase AC power source and a ground, the auxiliary converter unit being connected with an auxiliary control unit; the auxiliary converter unit comprising a plurality of mutual Parallel auxiliary converters;每个辅助变流器,用于对所述三相交流电源输出的交流电电压进行降压处理;并在发生接地故障时,对电路元件进行保护;检测流过的接地电流值,并将检测到的接地电流值发送至辅助控制单元;Each auxiliary converter is configured to perform a step-down process on the alternating current voltage outputted by the three-phase alternating current power source; and protect the circuit component when a ground fault occurs; detect a ground current value flowing through, and detect the The ground current value is sent to the auxiliary control unit;所述辅助控制单元,用于接收每个辅助变流器发送的接地电流值,并根据预先设置的标准阈值对所述接地电流值进行分析,以判断检测到该接地电流值的辅助变流器是否发生接地故障。The auxiliary control unit is configured to receive a ground current value sent by each auxiliary converter, and analyze the ground current value according to a preset standard threshold to determine an auxiliary converter that detects the ground current value. Whether a ground fault has occurred.
- 根据权利要求1所述的辅助变流装置,其特征在于,所述辅助变流器具体包括:The auxiliary converter according to claim 1, wherein the auxiliary converter specifically comprises:变压器,与所述三相交流电源相连接,用于对所述三相交流电源输出的交流电电压进行降压处理;a transformer connected to the three-phase AC power source for performing a step-down process on an AC voltage output by the three-phase AC power source;接地电阻单元,与所述变压器的输出端相连接,用于在发生接地故障时,对电路元件进行保护;a grounding resistance unit connected to the output end of the transformer for protecting the circuit component when a ground fault occurs;电流传感器,一端与所述接地电阻单元,另一端与大地相连接,用于在发生接地故障时,检测流过接地电阻单元的接地电流值,并将检测到的接地电流值发送至辅助控制单元。a current sensor having one end connected to the grounding resistance unit and the other end connected to the ground for detecting a ground current value flowing through the grounding resistance unit when a ground fault occurs, and transmitting the detected ground current value to the auxiliary control unit .
- 根据权利要求2所述的辅助变流装置,其特征在于,所述辅助控制单元根据预先设置的标准阈值对所述接地电流值进行分析,具体包括:The auxiliary converter device according to claim 2, wherein the auxiliary control unit analyzes the ground current value according to a preset standard threshold, which specifically includes:将所述接地电流值与预先设置的标准接地电流阈值进行分析比较,以判断检测到该接地电流值的辅助变流器是否发生接地故障;或者,And comparing and comparing the ground current value with a preset standard ground current threshold to determine whether the auxiliary current transformer that detects the ground current value has a ground fault; or获取所述接地电阻单元的接地电阻值,并根据所述接地电流值和所述接地电阻值得到接地电压值,将所述接地电压值与预先设置的标准接地电压阈值进行分析比较,以判断检测到该接地电压值的辅助变流器是否发生接地故障。Obtaining a grounding resistance value of the grounding resistance unit, and obtaining a grounding voltage value according to the grounding current value and the grounding resistance value, and comparing and comparing the grounding voltage value with a preset standard grounding voltage threshold to determine the detection. Whether the auxiliary converter to the ground voltage value has a ground fault.
- 根据权利要求2所述的辅助变流装置,其特征在于,还包括:The auxiliary converter device according to claim 2, further comprising:功率单元,与车辆动态控制***相连接,用于将经过车辆动态控制 ***的直流电逆变为交流电;Power unit, connected to the vehicle dynamic control system, for dynamic control through the vehicle The DC power of the system is reversed to AC;滤波单元,一端与所述功率单元的输出端相连接,另一端与所述变压器相连接。The filtering unit has one end connected to the output end of the power unit and the other end connected to the transformer.
- 根据权利要求4所述的辅助变流装置,其特征在于,所述功率单元为由三个IGBT模块构成的桥式电路结构。The auxiliary converter device according to claim 4, wherein the power unit is a bridge circuit structure composed of three IGBT modules.
- 根据权利要求4所述的辅助变流装置,其特征在于,所述滤波单元包括连接于所述功率单元和所述变压器之间的滤波电抗器以及与所述滤波电抗器相连接、且与所述变压器相并联的滤波电容模块。The auxiliary converter device according to claim 4, wherein the filtering unit comprises a filter reactor connected between the power unit and the transformer, and is connected to the filter reactor, and A filter capacitor module in which the transformers are connected in parallel.
- 根据权利要求5所述的辅助变流装置,其特征在于,所述滤波电抗器包括分别与所述三个IGBT模块相连接的第一电抗器、第二电抗器和第三电抗器。The auxiliary converter device according to claim 5, wherein the filter reactor comprises a first reactor, a second reactor, and a third reactor respectively connected to the three IGBT modules.
- 根据权利要求6所述的辅助变流装置,其特征在于,所述滤波电容模块为由三个电容构成的桥式电路结构。The auxiliary converter device according to claim 6, wherein the filter capacitor module is a bridge circuit structure composed of three capacitors.
- 根据权利要求3所述的辅助变流装置,其特征在于,所述预先设置的标准接地电压阈值为小于或等于36V。The auxiliary converter device of claim 3, wherein the predetermined standard ground voltage threshold is less than or equal to 36V.
- 根据权利要求2-8中任意一项所述的辅助变流装置,其特征在于,所述接地电阻单元由与所述变压器相连接的第一电阻以及与所述第一电阻相串联的第二电阻构成,所述第二电阻与所述电流传感器相连接。 The auxiliary current transformer according to any one of claims 2-8, wherein the grounding resistance unit is composed of a first resistor connected to the transformer and a second in series with the first resistor A resistor is formed, and the second resistor is connected to the current sensor.
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CN102739068A (en) * | 2011-03-31 | 2012-10-17 | 洛克威尔自动控制技术股份有限公司 | Ground scheme identification method |
CN103368128A (en) * | 2012-03-31 | 2013-10-23 | 永济新时速电机电器有限责任公司 | Ground fault protection device for locomotive auxiliary power system and electric locomotive |
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