阅读说明：本技术 一种矿用直流中压组合式变频调速器 (Mining direct current medium voltage combined variable frequency speed regulator ) 是由 王大利 于 2020-12-31 设计创作，主要内容包括：本发明公开一种矿用直流中压组合式变频调速器,包括控制系统、第一逆变功率单元、第二逆变功率单元和第三逆变功率单元,所述控制系统的输入端电性连接有电源,所述控制系统的输出端分别与第一逆变功率单元、第二逆变功率单元和第三逆变功率单元的输入端控制连接。本发明结构简单,设计合理,解决了变频器IGBT功率限制,满足了矿用井上中压直流牵引机车大功率电机使用需要,在主控系统中设置现有功率单元数量,设备可以降容运行,直接甩掉故障单元运行,等待维修后再恢复正常运行,在故障单元屏蔽后,只进行个别参数调整,软件硬件操作都比较简单,对现场维护人员技术水平要求不高,不用像普通一拖一变频器一样再去设置复杂的主从参数。(The invention discloses a mining direct-current medium-voltage combined variable-frequency speed regulator which comprises a control system, a first inversion power unit, a second inversion power unit and a third inversion power unit, wherein the input end of the control system is electrically connected with a power supply, and the output end of the control system is respectively in control connection with the input ends of the first inversion power unit, the second inversion power unit and the third inversion power unit. The invention has simple structure and reasonable design, solves the problem of the power limitation of the IGBT of the frequency converter, meets the use requirement of a high-power motor of a mining on-well medium-voltage direct-current traction locomotive, sets the number of the existing power units in a master control system, can reduce the capacity of equipment to operate, directly throws off the operation of a fault unit, recovers the normal operation after waiting for maintenance, only carries out individual parameter adjustment after the fault unit is shielded, has simpler software and hardware operation and low technical requirement on field maintenance personnel, and does not need to set complex master and slave parameters like the common one-drag-one frequency converter.)

1. The utility model provides a mining direct current middling pressure combination formula variable frequency speed regulator, includes control system (1), first contravariant power unit (A), second contravariant power unit (B) and third contravariant power unit (C), its characterized in that: the input end electric connection of control system (1) has power (2), the output of control system (1) respectively with the input control connection of first contravariant power unit (A), second contravariant power unit (B) and third contravariant power unit (C), parallelly connected setting between first contravariant power unit (A), second contravariant power unit (B) and third contravariant power unit (C), the output of power (2) passes through control system and first contravariant power unit (A), second contravariant power unit (B) and third contravariant power unit (C) parallel connection.

2. The mining direct-current medium-voltage combined variable-frequency speed regulator according to claim 1, characterized in that: the control system (1) adopts a direct current-alternating current asynchronous traction electric transmission system, a direct current link and an alternating current asynchronous traction motor in the middle of the control system (1) are composed, a traction frequency converter of the control system (1) adopts a high-precision torque DTC control scheme based on a 32-bit high-performance DSP chip, a pre-charging device (3) is arranged in the control system (1), and the pre-charging device (3) is composed of a silicon controlled rectifier (31) and a pre-charging resistor (32).

3. The mining direct-current medium-voltage combined variable-frequency speed regulator according to claim 1, characterized in that: the maximum power of the first inversion power unit (A), the second inversion power unit (B) and the third inversion power unit (C) is 1000KW, the output end of the first inversion power unit (A) is electrically connected with a first motor set (a), the output end of the second inversion power unit (B) is electrically connected with a second motor set (B), the output end of the third inversion power unit (C) is electrically connected with a third motor set (C), and the first motor set (a), the second motor set (B) and the third motor set (C) are composed of two motors.

4. The mining direct-current medium-voltage combined variable-frequency speed regulator according to claim 1, characterized in that: the control system (1) comprises a grounding protection unit (4), an overload protection unit (5), a short-circuit protection unit (6), a locked-rotor protection unit (7) and a phase-loss protection unit (8), and the control system (1) comprises an overvoltage protection module (9) and an undervoltage protection module (10), so that the working voltage of the locomotive can reach 1200-1880V.

5. The mining direct-current medium-voltage combined variable-frequency speed regulator according to claim 1, characterized in that: the output end of the control system (1) is connected with a heat dissipation system (11) in a control mode, the heat dissipation system (11) adopts a heat pipe forced air cooling heat dissipation mode, and the operation design environment of the heat dissipation system (11) is-30 degrees to +45 degrees.

6. The mining direct-current medium-voltage combined variable-frequency speed regulator according to claim 3, characterized in that: the output end of the control system (1) is respectively connected with the input ends of the first motor set (a), the second motor set (B) and the third motor set (C) in a control mode, and the output power of the first inversion power unit (A), the output power of the second inversion power unit (B) and the output power of the third inversion power unit (C) are respectively 1.5 times of the power of the first motor set (a), the output power of the second motor set (B) and the output power of the third motor set (C).

7. The mining direct-current medium-voltage combined variable-frequency speed regulator according to claim 1, characterized in that: the control system (1) is stepless speed regulation, the speed under the frequency of 1Hz can be given at the lowest, the traction motor increases and decreases the speed according to the given frequency of the speed regulation handle, and the highest speed can be set at the same time.

8. The mining direct-current medium-voltage combined variable-frequency speed regulator according to claim 1, characterized in that: the rising time of the first inversion power unit (A), the second inversion power unit (B) and the third inversion power unit (C) is set to 45 seconds, and the locomotive can reach the highest speed after 45 seconds.

9. The mining direct-current medium-voltage combined variable-frequency speed regulator according to claim 1, characterized in that: the output end of the control system (1) is connected with a fault alarm module (12) and a fault automatic circuit breaking module (13) in a control mode, and the fault alarm module (12) is composed of an alarm lamp (121) and a buzzer (122).

Technical Field

The invention relates to the technical field of mining speed regulators, in particular to a mining direct-current medium-voltage combined variable-frequency speed regulator.

Background

The direct current power supply alternating current motor variable frequency speed regulator of the electric locomotive for the crude ore is a low-voltage single variable frequency speed regulator, is mostly used for underground small-tonnage variable frequency speed regulating locomotives, is commonly used for 10T550V, 14T550V, 20T550V locomotives and the like, has low voltage, small power and limited load capacity, and can not meet the requirements of large-scale mine aboveground transportation, such as: the equipment can not stably and effectively operate after faults occur simultaneously in medium-voltage 80T and 150T traction locomotives and the like, a plurality of parameters need to be adjusted, the software and hardware operations are complex, and the requirements on the technical level of field maintenance personnel are high.

Disclosure of Invention

The invention aims to provide a mining direct-current medium-voltage combined variable-frequency speed regulator to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a mining direct current medium voltage combination formula variable frequency speed regulator, includes control system, first contravariant power unit, second contravariant power unit and third contravariant power unit, control system's input electric connection has the power, control system's output respectively with the input control connection of first contravariant power unit, second contravariant power unit and third contravariant power unit, parallelly connected setting between first contravariant power unit, second contravariant power unit and the third contravariant power unit, the output of power passes through control system and first contravariant power unit, second contravariant power unit and third contravariant power unit parallel connection.

As a further improvement of the invention, the control system adopts a direct current-alternating current asynchronous traction electric transmission system, the middle direct current link of the control system consists of an alternating current asynchronous traction motor, a traction frequency converter of the control system adopts a high-precision torque DTC control scheme based on a 32-bit high-performance DSP chip, and a pre-charging device is arranged in the control system and consists of a silicon controlled rectifier and a pre-charging resistor.

As a further improvement of the present invention, the maximum power of the first inverter power unit, the maximum power of the second inverter power unit, and the maximum power of the third inverter power unit are all 1000KW, the output end of the first inverter power unit is electrically connected to the first motor set, the output end of the second inverter power unit is electrically connected to the second motor set, the output end of the third inverter power unit is electrically connected to the third motor set, and the first motor set, the second motor set, and the third motor set are all composed of two motors.

As a further improvement of the invention, the control system comprises a grounding protection unit, an overload protection unit, a short-circuit protection unit, a locked rotor protection unit and a phase-failure protection unit, and the control system comprises an overvoltage protection module and an undervoltage protection module, so that the working voltage of the locomotive can reach 1200-1880V.

As a further improvement of the invention, the output end of the control system is connected with a heat dissipation system in a control mode, the heat dissipation system adopts a heat pipe forced air cooling heat dissipation mode, and the operation design environment of the heat dissipation system is-30 degrees to +45 degrees.

As a further improvement of the present invention, an output end of the control system is respectively connected to input ends of the first motor group, the second motor group and the third motor group in a control manner, and output powers of the first inverter power unit, the second inverter power unit and the third inverter power unit are respectively 1.5 times of powers of the first motor group, the second motor group and the third motor group.

As a further improvement of the invention, the control system adopts stepless speed regulation, the speed of the traction motor can be given at the lowest frequency of 1Hz, the speed of the traction motor can be increased or decreased within the frequency range of 1Hz-100Hz according to the given frequency of the speed regulation handle, and the highest speed can be set at the same time.

As a further improvement of the invention, the rising time of the first inverter power unit, the second inverter power unit and the third inverter power unit is set to 45 seconds, and the locomotive can reach the highest speed after 45 seconds.

As a further improvement of the invention, the output end of the control system is connected with a fault alarm module and a fault automatic circuit-breaking module in a control mode, and the fault alarm module consists of an alarm lamp and a buzzer.

Compared with the prior art, the invention has the beneficial effects that:

1. the control system, the first inversion power unit, the second inversion power unit and the third inversion power unit are arranged in parallel, equipment can operate in a capacity-reducing mode, the fault unit is directly thrown away after a fault occurs, normal operation is recovered after maintenance is waited, after the fault unit is shielded, individual parameter adjustment is only carried out, software and hardware are simple to operate, the requirement on the technical level of field maintenance personnel is not high, and complex master and slave parameters do not need to be set like a common one-drive-one frequency converter;

2. the control system adopts a direct-alternating current and alternating current asynchronous traction electric transmission system, and a traction frequency converter of the control system adopts a high-precision torque DTC control scheme based on a 32-bit high-performance DSP chip, so that the locomotive has stronger traction under the same adhesion condition and has strong adaptability under severe environment;

3. according to the invention, the first motor set, the second motor set and the third motor set are arranged, so that the speed and torque difference among the running of a plurality of motors is reduced, the IGBT power limitation of the frequency converter is solved, and the use requirement of a high-power motor of a mining underground medium-voltage direct-current traction locomotive is met.

Drawings

FIG. 1 is a circuit diagram of a mining DC medium voltage combined variable frequency speed regulator;

fig. 2 is an overall schematic block diagram of a mining direct-current medium-voltage combined variable-frequency speed regulator.

In the figure: 1. a control system; 2. a power source; 3. a pre-charging device; 31. silicon controlled rectifier; 32. pre-charging a resistor; 4. a ground protection unit; 5. an overload protection unit; 6. a short-circuit protection unit; 7. a locked rotor protection unit; 8. a phase-loss protection unit; 9. an overvoltage protection module; 10. an undervoltage protection module; 11. a heat dissipation system; 12. a fault alarm module; 121. an alarm lamp; 122. a buzzer; 13. a fault automatic shutdown module; A. a first inversion power unit; B. a second inverter power unit; C. a third inverter power unit; a. a first motor group; b. a second motor group; c. and a third motor group.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

It will be understood that when an element is referred to as being "fixed," "mounted," "connected," or "disposed" to another element, it can be directly on the other element or be indirectly on the other element. It will be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships that are based on the orientations or positional relationships shown in the drawings, are used merely to facilitate description of the present invention and to simplify description, and do not indicate or imply that the referenced devices or elements must have the particular orientations, configurations and operations described in the specification, and therefore are not to be considered limiting.

As a further development of the invention, the terms "first", "second", "third", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying a number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

Referring to fig. 1-2, the present invention provides a technical solution: the utility model provides a mining direct current medium voltage combination formula variable frequency speed regulator, including control system 1, first contravariant power unit A, second contravariant power unit B and third contravariant power unit C, control system 1's input electric connection has power 2, control system 1's output respectively with first contravariant power unit A, second contravariant power unit B and third contravariant power unit C's input control connection, first contravariant power unit A, parallelly connected setting between second contravariant power unit B and the third contravariant power unit C, power 2's output passes through control system and first contravariant power unit A, second contravariant power unit B and third contravariant power unit C parallel connection.

The device is provided with the first inversion power unit A, the second inversion power unit B and the third inversion power unit C which are connected in parallel, the number of the existing power units is set in a master control system, the device can be operated in a capacity reduction mode, a fault unit is directly thrown away for operation, normal operation is recovered after maintenance is waited, only individual parameter adjustment is carried out after the fault unit is shielded, software and hardware are simple to operate, the technical requirement on field maintenance personnel is not high, and complicated master-slave parameters do not need to be set like a common frequency converter with one drive;

in some embodiments of the present invention, the control system 1 adopts a dc-ac asynchronous traction electric transmission system, the intermediate dc link of the control system 1 and an ac asynchronous traction motor constitute, the traction frequency converter of the control system 1 adopts a high-precision torque DTC control scheme based on a 32-bit high-performance DSP chip, and the control system 1 is provided with a pre-charging device 3, and the pre-charging device 3 consists of a thyristor 31 and a pre-charging resistor 32.

By adopting a direct-alternating current and alternating current asynchronous traction electric transmission system, a traction frequency converter of the control system 1 adopts a high-precision torque DTC control scheme based on a 32-bit high-performance DSP chip, so that the locomotive has stronger traction under the same adhesion condition and has strong adaptability under severe environment;

in some embodiments of the present invention, the maximum power of each of the first inverter power unit a, the second inverter power unit B, and the third inverter power unit C is 1000KW, the output end of the first inverter power unit a is electrically connected to the first motor group a, the output end of the second inverter power unit B is electrically connected to the second motor group B, the output end of the third inverter power unit C is electrically connected to the third motor group C, and each of the first motor group a, the second motor group B, and the third motor group C is composed of two motors.

By arranging the first motor set a, the second motor set b and the third motor set c, the speed and torque difference among the first motor set a, the second motor set b and the third motor set c is reduced, the IGBT power limitation of a frequency converter is solved, and the use requirement of a high-power motor of a medium-voltage direct-current traction locomotive on a mine well is met;

in some embodiments of the present invention, the control system 1 includes a ground protection unit 4, an overload protection unit 5, a short-circuit protection unit 6, a locked rotor protection unit 7, and a phase-loss protection unit 8, and the control system 1 includes an overvoltage protection module 9 and an undervoltage protection module 10, so that the operating voltage of the locomotive can reach 1200-1880V.

The control system 1 can effectively protect the motor and has a voltage-loss protection function by arranging the ground protection unit 4, the overload protection unit 5, the short-circuit protection unit 6, the locked-rotor protection unit 7, the open-phase protection unit 8, the overvoltage protection module 9 and the undervoltage protection module 10, and can change a generator in operation into a power generation state when detecting that the voltage of a main bus is reduced in operation, and can maintain normal operation even in the power-loss state;

in some embodiments of the present invention, the output end of the control system 1 is connected to a heat dissipation system 11 in a control manner, the heat dissipation system 11 adopts a heat pipe forced air cooling heat dissipation manner, and the operation design environment of the heat dissipation system 11 is-30 degrees to +45 degrees.

Through setting up cooling system 11, the heat that the converter produced is taken away by the fan during operation. The heat dissipation problem of the frequency converter is well solved;

in some embodiments of the present invention, the output end of the control system 1 is respectively connected to the input ends of the first motor group a, the second motor group B, and the third motor group C in a control manner, and the output power of the first inverter power unit a, the output power of the second inverter power unit B, and the output power of the third inverter power unit C are respectively 1.5 times the power of the first motor group a, the output power of the second inverter power unit B, and the output power of the third inverter power unit C.

In order to reduce the speed and torque difference among the first motor set a, the second motor set B and the third motor set C, the output power of the first inverter power unit A, the second inverter power unit B and the third inverter power unit C is set to be 1.5 times of the power of the first motor set a, the second motor set B and the third motor set C;

in some embodiments of the invention, the control system 1 is stepless speed regulation, the speed at the frequency of 1Hz can be given at the lowest, the traction motor can increase or decrease the speed within the frequency range of 1Hz-100Hz according to the given frequency of the speed regulation handle, and the highest speed can be set at the same time.

By setting the control system to stepless speed regulation, the runaway phenomenon of the locomotive cannot be caused even if the locomotive runs down a slope or is lightly loaded. The control system can avoid misoperation;

in some embodiments of the present invention, the time for the first inverter power unit a, the second inverter power unit B, and the third inverter power unit C to rise is set to 45 seconds, and the locomotive reaches the maximum speed after 45 seconds.

The rising time of the first inversion power unit A, the second inversion power unit B and the third inversion power unit C is set to 45 seconds, so that the impact of sudden acceleration on the gear can be effectively avoided, and the service life of the gear is prolonged to the maximum extent;

in some embodiments of the present invention, the output end of the control system 1 is connected with a fault alarm module 12 and a fault automatic circuit breaking module 13, and the fault alarm module 12 is composed of an alarm lamp 121 and a buzzer 122;

by providing the fault alarm module 12 and the fault automatic cutout module 13, it is possible to quickly raise an alarm and disconnect the corresponding power unit when a fault occurs.

In the device, a control system 1, a first inversion power unit A, a second inversion power unit B and a third inversion power unit C are arranged in parallel, the first inversion power unit A, the second inversion power unit B and the third inversion power unit C are arranged in parallel, equipment can operate in a capacity-reducing mode, a fault unit is directly thrown away to operate after a fault occurs, normal operation is recovered after maintenance is waited, only individual parameter adjustment is carried out after the fault unit is shielded, software and hardware operations are simple, the technical level requirement on field maintenance personnel is not high, complex master and slave parameters are not needed to be set like a common one-drive-one frequency converter, the control system 1 adopts a direct-alternating current asynchronous traction electric transmission system, a traction frequency converter of the control system 1 adopts a high-precision torque DTC control scheme based on a 32-bit high-performance DSP chip, so that a locomotive has stronger traction force under the same adhesion condition, the adaptability is strong under the severe environment, the first motor set a, the second motor set b and the third motor set c are arranged at the same time, the speed and torque difference among the running of a plurality of motors is reduced, the IGBT power limitation of the frequency converter is solved, and the use requirement of the high-power motor of the mining underground medium-voltage direct-current traction locomotive is met.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.