CN215072169U - Remote low-voltage large-capacity stable power supply device in mine - Google Patents
Remote low-voltage large-capacity stable power supply device in mine Download PDFInfo
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- CN215072169U CN215072169U CN202121228684.2U CN202121228684U CN215072169U CN 215072169 U CN215072169 U CN 215072169U CN 202121228684 U CN202121228684 U CN 202121228684U CN 215072169 U CN215072169 U CN 215072169U
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Abstract
A remote low-voltage large-capacity stable power supply device under a mine well comprises a power supply conversion circuit and a control circuit; the power supply conversion circuit comprises a step-up transformer, a full-wave rectification controllable bridge, a filter circuit, a three-phase full-bridge inverter and a three-phase output transformer, wherein a low-voltage power supply transmitted from a far end is subjected to step-up by the step-up transformer, then is converted into direct current with voltage changing along with final output voltage by the full-wave rectification controllable bridge and the filter circuit under the control of the control circuit, and then is converted into a three-phase power supply with stable voltage by the three-phase full-bridge inverter and the three-phase output transformer, so that low-voltage long-distance large-capacity stable power supply is realized; by using the power supply device, the underground long-distance low-voltage large-capacity stable power supply of the mine can be reliably realized under the condition that the transmission cable allows the maximum transmission capacity, and the difficult problem of the underground low-voltage long-distance large-capacity temporary stable power supply is effectively solved.
Description
Technical Field
The utility model relates to a remote transmission of electricity technical field in the mine, concretely relates to remote low pressure large capacity stabilizes power supply unit in mine.
Background
When a long tunnel or an underground long-distance tunnel of a mine is constructed at home and abroad, because the power of electrical equipment is high and a power transmission line is long, the voltage drop of the power transmission line is required to be small for normal operation of engineering machinery, and particularly, microelectronic control construction equipment is used, and the power supply can normally work only when the power supply is stable; therefore, the problem that the long-distance use of the electric machine in the underground of the mine needs to solve is to ensure the voltage quality of the low-voltage power supply for long-distance transmission.
In mine power design specifications and industrial and civil power distribution equipment design manuals, the power supply radius of a 400V line is required to be not more than 500m, and a substation is considered to be additionally arranged when the power supply distance exceeds 500 m; in the underground construction project of a mine, a high-voltage chamber or a substation with the length of more than 500m is generally provided with power supply in a high-voltage to low-voltage mode, temporary low-power remote power supply adopts a mode of increasing the cable diameter and carrying out on-site reactive compensation for power supply, but no good solution is provided for high-power remote low-voltage power supply at present.
For example, during temporary construction such as underground drilling construction, raise boring construction and the like, the position is often far away and is more than 1km away from a high-voltage chamber or a substation, if the temporary high-voltage chamber or the substation is arranged, the engineering cost is huge, but low-voltage remote power transmission is adopted, the power of construction equipment is large, the power supply voltage drop is large, the voltage drops to below 330V during loading, so that the drilling equipment cannot be normally started or the motor is frequently burnt, and therefore the problem of realizing underground low-voltage remote large-capacity temporary stable power supply becomes an urgent solution.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects in the background technology, the utility model discloses a remote low-voltage large-capacity stable power supply device under a mine well, which comprises a power supply conversion circuit and a control circuit; the power conversion circuit comprises a step-up transformer, a full-wave rectification controllable bridge, a filter circuit, a three-phase full-bridge inverter and a three-phase output transformer, a low-voltage power supply transmitted from a far end is boosted by the step-up transformer, converted into direct current with voltage changing along with final output voltage by the full-wave rectification controllable bridge and the filter circuit under the control of the control circuit, and then converted into a three-phase power supply with stable voltage by the three-phase full-bridge inverter and the three-phase output transformer, so that the low-voltage long-distance large-capacity stable power supply is realized.
In order to realize the utility model aims at, the utility model adopts the following technical scheme: a remote low-voltage large-capacity stable power supply device in a mine well comprises a power supply conversion circuit and a control circuit, wherein the power supply conversion circuit is electrically connected with the control circuit, and the control circuit controls the power supply conversion circuit to convert power supplied from a remote distance twice so as to ensure the stability of the most total output voltage;
the power supply conversion circuit comprises an incoming line breaker, a step-up transformer, a full-wave rectification controllable bridge, a filter circuit, a three-phase full-bridge inverter and a three-phase output transformer, wherein the incoming line breaker, the step-up transformer, the full-wave rectification controllable bridge, the filter circuit, the three-phase full-bridge inverter and the three-phase output transformer are electrically connected in sequence, and the power supply conversion circuit is called for voltage conversion as follows: the low-voltage power supply transmitted from the far end is boosted by the step-up transformer and then converted into direct current with voltage changing along with the final output voltage by the full-wave rectification controllable bridge and the filter circuit under the control of the control circuit, the change of the direct current voltage is used for compensating the voltage drop generated by the power conversion circuit when the stable power supply device is loaded, and the direct current is converted into a three-phase power supply with stable voltage by the three-phase full-bridge inverter and the three-phase output transformer, so that the low-voltage long-distance large-capacity stable power supply is realized; the output voltage after being boosted by the booster transformer is about 420V and is higher than the final 380V output voltage of the stable power supply device, so that sufficient redundancy guarantee is provided for the stability of the output voltage of the stable power supply device after being loaded; the direct-current voltage converted by the full-wave rectification controllable bridge and the filter circuit is controlled by voltage feedback output by a three-phase output transformer collected by a main control board, the control process adopts PID control, and the feedback voltage achieves the purpose of controlling the direct-current voltage by controlling the switching frequency and the duty ratio of a three-phase full-bridge inverter;
the control circuit comprises a main control board and a drive board; the main control board is respectively electrically connected with the full-wave rectification controllable bridge, the driving board and the three-phase output transformer, and the driving board is electrically connected with the three-phase full-bridge inverter; the main control board is electrically connected with the three-phase output transformer and is used for acquiring voltage, frequency and phase information loaded by a three-phase primary coil of the three-phase output transformer, the main control board generates two groups of control signals according to the acquired information, one group of control signals is full-wave rectification controllable bridge control signals, and the other group of control signals is drive board control signals; the full-wave rectification controllable bridge control signals comprise six rectangular wave control signals which are respectively used for controlling the conduction of six IGBTs of the full-wave rectification controllable bridge, the six rectangular wave control signals are divided into three groups, the three groups of signals have the same frequency, the phases have 120-degree phase difference, and the duty ratio is controlled by the voltage loaded by the three-phase primary coil of the three-phase output transformer collected by the main control board; the driving plate control signals are divided into three, the three control signals have 120-degree phase difference and are respectively and correspondingly input into three independent drivers A, B and C, the three drivers A, B and C are respectively converted into four control signals, the four control signals are divided into two groups, the four control signals respectively control the conduction of four IGBTs in a full-bridge inverter A, a full-bridge inverter B and a full-bridge inverter C, so that the full-bridge inverter A, the full-bridge inverter B and the full-bridge inverter C output three rectangular wave voltages with the frequency of 50Hz and the phase difference of 120 degrees, the three rectangular wave voltages output by the full-bridge inverter A, the full-bridge inverter B and the full-bridge inverter C output three-phase 380V alternating current with stable voltage through an output transformer A, an output transformer B and an output transformer C, and are used for driving high-power electric equipment in a mine well,
further, the three-phase full-bridge inverter comprises three independent full-bridge inverters A, B and C; the three-phase output transformer comprises three independent output transformers A, an output transformer B and an output transformer C; the full-bridge inverter A, the full-bridge inverter B and the full-bridge inverter C are respectively and correspondingly electrically connected with primary windings of the output transformer A, the output transformer B and the output transformer C; one in-phase output end of the secondary windings of the output transformer A, the output transformer B and the output transformer C is in short circuit, and the other in-phase output end is a three-phase power supply output end of the long-distance large-capacity stable power supply device.
Furthermore, the main control board comprises a voltage and phase detection and drive control module; the voltage and phase detection and drive control module is electrically connected with the voltage sensors which are independently arranged at the in-phase input ends of the primary windings of the output transformer A, the output transformer B and the output transformer C respectively.
Further, the driving board comprises three independent drivers A, B and C; one end of each of the driver A, the driver B and the driver C is electrically connected with the voltage and phase detection and drive control module in the main control board, and the other end of each of the driver A, the driver B and the driver C is electrically connected with the full-bridge inverter A, the full-bridge inverter B and the full-bridge inverter C correspondingly.
Furthermore, the circuit structures of the full-bridge inverter A, the full-bridge inverter B and the full-bridge inverter C are the same, and the full-bridge inverter A, the full-bridge inverter B and the full-bridge inverter C respectively comprise four IGBTs; the circuit structures of the driver A, the driver B and the driver C are the same, and the driver A, the driver B and the driver C respectively comprise four driving modules; the four driving modules contained in the driver A, the driver B and the driver C are respectively and electrically connected with the grid electrodes of the four IGBTs contained in the full-bridge inverter A, the full-bridge inverter B and the full-bridge inverter C; the voltage and phase detection and drive control module outputs four paths of rectangular square waves corresponding to one driver A, one driver B or one driver C, and the four paths of rectangular square waves are amplified by the four drive modules of the driver A, the driver B or the driver C respectively and then control the on and off of four IGBTs of the full-bridge inverter A, the full-bridge inverter B or the full-bridge inverter C.
Furthermore, a starting-up protection circuit is arranged between the incoming line breaker and the step-up transformer, the starting-up protection circuit comprises current-limiting resistors and switches which are arranged on three cables connected between the incoming line breaker and the step-up transformer in parallel, and the current-limiting resistors are used for protecting the high-capacity stable power supply device from overlarge current impact at the moment of opening; the power-on protection circuit is electrically connected with the main control board, and the large-capacity stable power supply device is controlled to be turned on and off by the main control board.
Furthermore, the input end of the step-up transformer is provided with a reactive compensation capacitor which is used for improving the power factor of the large-capacity stable power supply device and reducing the power consumption on the long-distance transmission cable.
Due to the adoption of the technical scheme, the utility model discloses following beneficial effect has: the utility model discloses a remote low-voltage large-capacity stable power supply device under mine, which comprises a power supply conversion circuit and a control circuit; the power supply conversion circuit comprises a step-up transformer, a full-wave rectification controllable bridge, a filter circuit, a three-phase full-bridge inverter and a three-phase output transformer, wherein a low-voltage power supply transmitted from a far end is subjected to step-up by the step-up transformer, then is converted into direct current with voltage changing along with final output voltage by the full-wave rectification controllable bridge and the filter circuit under the control of the control circuit, and then is converted into a three-phase power supply with stable voltage by the three-phase full-bridge inverter and the three-phase output transformer, so that low-voltage long-distance large-capacity stable power supply is realized; by using the power supply device, the underground long-distance low-voltage large-capacity stable power supply of the mine can be reliably realized under the condition that the transmission cable allows the maximum transmission capacity, and the difficult problem of the underground low-voltage long-distance large-capacity temporary stable power supply is effectively solved.
Drawings
FIG. 1 is a functional block diagram of a remote low-voltage large-capacity stable power supply device under a mine;
FIG. 2 is a functional block diagram of a power conversion circuit;
fig. 3 is a functional block diagram of a control circuit.
In the figure: 1. a power conversion circuit; 1.1, a three-phase full-bridge inverter; 1.2, a three-phase output transformer; 2. a control circuit.
Detailed Description
The invention will be explained in more detail by the following examples, which disclose the invention and are intended to protect all technical improvements within the scope of the invention.
A remote low-voltage large-capacity stable power supply device in a mine well comprises a power supply conversion circuit 1 and a control circuit 2, wherein the power supply conversion circuit 1 is electrically connected with the control circuit 2; the power supply conversion circuit 1 comprises an incoming line breaker, a step-up transformer, a full-wave rectification controllable bridge, a filter circuit, a three-phase full-bridge inverter 1.1 and a three-phase output transformer 1.2, wherein the incoming line breaker, the step-up transformer, the full-wave rectification controllable bridge, the filter circuit, the three-phase full-bridge inverter 1.1 and the three-phase output transformer 1.2 are electrically connected in sequence; the startup protection circuit is electrically connected with the main control board; the control circuit 2 comprises a main control board and a drive board; the main control board is respectively electrically connected with the full-wave rectification controllable bridge, the drive board and the three-phase output transformer 1.2; the driving plate is electrically connected with the three-phase full-bridge inverter 1.1;
the three-phase full-bridge inverter 1.1 comprises three independent full-bridge inverters A, B and C; the three-phase output transformer 1.2 comprises three independent output transformers A, B and C; the full-bridge inverter A, the full-bridge inverter B and the full-bridge inverter C are respectively and correspondingly electrically connected with primary windings of the output transformer A, the output transformer B and the output transformer C; one in-phase output end of the secondary windings of the output transformer A, the output transformer B and the output transformer C is in short circuit, and the other in-phase output end is a three-phase power supply output end of the remote large-capacity stable power supply device;
the main control board comprises a voltage and phase detection and drive control module; the voltage and phase detection and drive control module is respectively and electrically connected with the voltage sensors which are independently arranged at the in-phase input ends of the primary windings of the output transformer A, the output transformer B and the output transformer C;
the driving plate comprises three independent drivers A, B and C; one end of each of the driver A, the driver B and the driver C is electrically connected with the voltage and phase detection and drive control module in the main control board, and the other end of each of the driver A, the driver B and the driver C is electrically connected with the full-bridge inverter A, the full-bridge inverter B and the full-bridge inverter C correspondingly;
the full-bridge inverter A, the full-bridge inverter B and the full-bridge inverter C have the same circuit structure, and the full-bridge inverter A, the full-bridge inverter B and the full-bridge inverter C respectively comprise four IGBTs; the circuit structures of the driver A, the driver B and the driver C are the same, and the driver A, the driver B and the driver C respectively comprise four driving modules; the four driving modules contained in the driver A, the driver B and the driver C are respectively and electrically connected with the grid electrodes of the four IGBTs contained in the full-bridge inverter A, the full-bridge inverter B and the full-bridge inverter C; the voltage and phase detection and drive control module outputs four paths of rectangular square waves corresponding to one driver A, one driver B or one driver C, and the four paths of rectangular square waves are amplified by the four drive modules of the driver A, the driver B or the driver C respectively and then control the on and off of four IGBTs of the full-bridge inverter A, the full-bridge inverter B or the full-bridge inverter C.
The input end of the step-up transformer is provided with a reactive compensation capacitor.
The part of the utility model not detailed is prior art.
Claims (7)
1. The utility model provides a long-range low pressure large capacity stable power supply unit in mine pit which characterized by: the power supply switching circuit comprises a power supply switching circuit (1) and a control circuit (2), wherein the power supply switching circuit (1) is electrically connected with the control circuit (2);
the power supply conversion circuit (1) comprises an incoming line breaker, a step-up transformer, a full-wave rectification controllable bridge, a filter circuit, a three-phase full-bridge inverter (1.1) and a three-phase output transformer (1.2), wherein the incoming line breaker, the step-up transformer, the full-wave rectification controllable bridge, the filter circuit, the three-phase full-bridge inverter (1.1) and the three-phase output transformer (1.2) are electrically connected in sequence;
the control circuit (2) comprises a main control board and a drive board; the main control board is respectively and electrically connected with the full-wave rectification controllable bridge, the drive board and the three-phase output transformer (1.2); the driving plate is electrically connected with the three-phase full-bridge inverter (1.1).
2. The underground remote low-voltage large-capacity stable power supply device for the mine as claimed in claim 1, wherein: the three-phase full-bridge inverter (1.1) comprises three independent full-bridge inverters A, B and C; the three-phase output transformer (1.2) comprises three independent output transformers A, an output transformer B and an output transformer C; the full-bridge inverter A, the full-bridge inverter B and the full-bridge inverter C are respectively and correspondingly electrically connected with primary windings of the output transformer A, the output transformer B and the output transformer C; one in-phase output end of the secondary windings of the output transformer A, the output transformer B and the output transformer C is in short circuit, and the other in-phase output end is a three-phase power supply output end of the long-distance large-capacity stable power supply device.
3. The underground remote low-voltage large-capacity stable power supply device for the mine as claimed in claim 2, wherein: the main control board comprises a voltage and phase detection and drive control module; the voltage and phase detection and drive control module is electrically connected with the voltage sensors which are independently arranged at the in-phase input ends of the primary windings of the output transformer A, the output transformer B and the output transformer C respectively.
4. The underground remote low-voltage large-capacity stable power supply device for the mine as claimed in claim 3, wherein: the driving plate comprises three independent drivers A, B and C; one end of each of the driver A, the driver B and the driver C is electrically connected with the voltage and phase detection and drive control module in the main control board, and the other end of each of the driver A, the driver B and the driver C is electrically connected with the full-bridge inverter A, the full-bridge inverter B and the full-bridge inverter C correspondingly.
5. The underground remote low-voltage large-capacity stable power supply device for the mine as claimed in claim 4, wherein: the full-bridge inverter A, the full-bridge inverter B and the full-bridge inverter C have the same circuit structure, and the full-bridge inverter A, the full-bridge inverter B and the full-bridge inverter C respectively comprise four IGBTs; the circuit structures of the driver A, the driver B and the driver C are the same, and the driver A, the driver B and the driver C respectively comprise four driving modules; the four driving modules contained in the driver A, the driver B and the driver C are respectively and electrically connected with the grid electrodes of the four IGBTs contained in the full-bridge inverter A, the full-bridge inverter B and the full-bridge inverter C; the voltage and phase detection and drive control module outputs four paths of rectangular square waves corresponding to one driver A, one driver B or one driver C, and the four paths of rectangular square waves are amplified by the four drive modules of the driver A, the driver B or the driver C respectively and then control the on and off of four IGBTs of the full-bridge inverter A, the full-bridge inverter B or the full-bridge inverter C.
6. The underground remote low-voltage large-capacity stable power supply device for the mine as claimed in claim 1, wherein: a starting-up protection circuit is arranged between the incoming line breaker and the step-up transformer and comprises current-limiting resistors and switches which are arranged on three cables connected between the incoming line breaker and the step-up transformer in parallel; the power-on protection circuit is electrically connected with the main control board.
7. The underground remote low-voltage large-capacity stable power supply device for the mine as claimed in claim 1, wherein: the input end of the step-up transformer is provided with a reactive compensation capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121228684.2U CN215072169U (en) | 2021-06-03 | 2021-06-03 | Remote low-voltage large-capacity stable power supply device in mine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121228684.2U CN215072169U (en) | 2021-06-03 | 2021-06-03 | Remote low-voltage large-capacity stable power supply device in mine |
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| CN215072169U true CN215072169U (en) | 2021-12-07 |
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| CN202121228684.2U Active CN215072169U (en) | 2021-06-03 | 2021-06-03 | Remote low-voltage large-capacity stable power supply device in mine |
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- 2021-06-03 CN CN202121228684.2U patent/CN215072169U/en active Active
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