CN216625604U - Medium-voltage direct-current power supply system with stepless voltage regulation - Google Patents
Medium-voltage direct-current power supply system with stepless voltage regulation Download PDFInfo
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- CN216625604U CN216625604U CN202122494617.1U CN202122494617U CN216625604U CN 216625604 U CN216625604 U CN 216625604U CN 202122494617 U CN202122494617 U CN 202122494617U CN 216625604 U CN216625604 U CN 216625604U
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Abstract
The utility model discloses a medium-voltage direct-current power supply system with stepless voltage regulation, which comprises a power supply driving system and a control system, wherein the power supply driving system comprises a voltage regulating transformer, a rectifier transformer and a pulse wave full-control rectifying device, the voltage regulating transformer is connected with the rectifier transformer through a cable, the rectifier transformer is mutually connected with the pulse wave full-control rectifying device through a cable, and signals of output states of the voltage regulating transformer, the rectifier transformer and the pulse wave full-control rectifying device are connected with the control system through cables, communication lines and the like. The device provides wide-voltage stepless voltage regulation through the linkage of the voltage regulating transformer and the rectifying system, and has simple structure and more stable operation.
Description
Technical Field
The utility model relates to the technical field of adjustable medium-voltage direct-current power supplies, in particular to a medium-voltage direct-current power supply system with stepless voltage regulation.
Background
With the development of power electronic technology and the increasing maturity of technology, all countries in the world are dedicated to the research of direct current power grids. Compared with an alternating current power grid, in some fields, particularly in a ship power grid, the direct current power grid can improve energy efficiency and reduce operation cost, and can better accord with the development trend of informatization and intellectualization. Direct current power grid laboratories and manufacturing enterprises need an adjustable medium voltage direct current power supply apparatus for testing the function and performance of direct current power grid equipment. The current adjustable medium-voltage direct-current power supply device mainly comprises a multi-tap transformer and a fully-controlled rectifier, wherein a tap of the transformer is adjusted to select a direct-current voltage output gear, and then the direct-current power supply is adjusted through the fully-controlled rectifier. The voltage regulation of the medium-voltage direct-current power supply device is troublesome, and when the direct-current power supply needs to be regulated within a wide voltage range, a multi-tap transformer needs a plurality of taps, so that the production difficulty of the transformer is greatly increased, most transformer manufacturers cannot produce the transformer, and meanwhile, the transformer is easy to break down and maintain.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a medium-voltage direct-current power supply system with stepless voltage regulation, which aims to solve the problems in the background technology. In order to achieve the purpose, the utility model provides the following technical scheme: the utility model provides a middling pressure direct current power supply system of electrodeless pressure regulating, includes power drive system and control system, power drive system includes that regulating transformer, rectifier transformer, the full controlling rectifier unit of pulse wave, regulating transformer passes through cable junction rectifier transformer, rectifier transformer and the full controlling rectifier unit of pulse wave pass through cable interconnect, signals such as regulating transformer, rectifier transformer, the full controlling rectifier unit of pulse wave output state pass through cable, communication line and be connected with control system.
Preferably, the pulse wave full-control rectifying device comprises four groups of full-wave rectifying bridges of the thyristor trigger circuit.
Preferably, the control system comprises a control cabinet and an upper computer, wherein the control cabinet is provided with a remote communication interface and can communicate with the upper computer.
Preferably, the rectifier transformer is provided with a low voltage secondary winding.
Preferably, the upper computer is an industrial personal computer, corresponding control software is arranged in the industrial personal computer, and the control cabinet is a PLC control cabinet.
The utility model has the technical effects and advantages that: the device provides wide-voltage stepless voltage regulation through the linkage of the voltage regulating transformer and the rectifying system, and has simple structure and more stable operation.
Drawings
FIG. 1 is a functional block diagram of the present invention;
FIG. 2 is a diagram of a primary system of the present invention.
In the figure: 1-regulating transformer, 2-rectifier transformer, 3-pulse wave full-control rectifier.
Detailed Description
In the description of the present invention, it should be noted that unless otherwise specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, integrally connected, mechanically connected, or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements.
Examples
The medium-voltage direct-current power supply system with stepless voltage regulation as shown in fig. 1 and fig. 2 comprises a power supply driving system and a control system, wherein the power supply driving system comprises a regulating transformer 1, a rectifier transformer 2 and a pulse wave fully-controlled rectifying device 3, the regulating transformer 1 is connected with the rectifier transformer 2 through a cable, the rectifier transformer 2 is connected with the pulse wave fully-controlled rectifying device 3 through a cable, and signals of output states and the like of the regulating transformer 1, the rectifier transformer 2 and the pulse wave fully-controlled rectifying device 3 are connected with the control system through a cable, a communication line and the like;
the input voltage is connected to the primary side of the regulating transformer, and the output range of the regulating transformer 1 and the transformation ratio of the rectifier transformer 2 are correspondingly designed according to requirements. The three-phase alternating current sent by the power grid is connected into the regulating transformer 1 for one time, the regulating transformer 1 is connected into the rectifier transformer 2 for the second time, and four three-phase windings are arranged on the second time of each rectifier transformer 2 to supply three-phase alternating current power for the pulse wave full-control rectifier 3;
the rectifier transformer 2 is also provided with a low-voltage secondary winding, and the functions are two: pre-magnetizing function and low-voltage debugging function. Pre-magnetizing can limit the switching-on inrush current of the transformer within a safety range below rated current; the low-voltage debugging function is mainly used for low-voltage no-load debugging, and can be used for outputting direct current under the condition that high voltage is not electrified so as to facilitate low-voltage no-load debugging;
the full-wave rectifier bridge of the four groups of thyristor trigger circuit structures used by the pulse wave full-control rectifier device 3 is completely the same in structure and can be interchanged, the input is three-phase controllable rectification, the direct current arm obtains a neutral point Z after resistance voltage division, and the positive pole, the negative pole and the neutral point of the direct current output are all output by a busbar.
The control device comprises 1 control cabinet and 1 upper computer. The control cabinet mainly comprises Siemens S7-200 series PLC, a touch screen, a low-voltage pre-charging magneto resistor, a UPS and other control devices, and the upper computer comprises one industrial personal computer and is provided with a liquid crystal display and control software. The main components of the control cabinet adopt a digital signal processor, a friendly human-computer interface is provided, and data and operation records of all parts of the whole direct-current power supply device are displayed and monitored. The control cabinet is provided with a remote communication interface and can be communicated with an upper computer, so that the upper computer can collect, store, analyze and judge various operating parameters and signal data of the direct-current power supply device and control each unit of the direct-current power supply device.
The whole medium-voltage direct-current power supply device adopts a double-PID series control mode to realize the stable regulation of the output voltage of the system, namely, the PID regulation of the rectifying device and the PID regulation of the voltage regulator, the controllable output voltage can be regulated at will in a wide voltage range, and the requirements of users on different voltage grades can be met.
Firstly, an upper computer of a control system is used for setting an output voltage target value, a thyristor conduction pin and an internal mathematical model are controlled by a PID (proportion integration differentiation) regulating system in a pulse wave full-control rectifying device 3 to convert an input alternating voltage value of the rectifying device, the alternating voltage value is used as a set target value of a PID regulating system of a voltage regulator, meanwhile, real-time measurement is carried out on the secondary side of the voltage regulator, and fine adjustment is carried out through comparison between the target value and the set value until a preset value is reached. The whole process of the system does not need manual intervention, stepless regulation of output voltage is realized through automatic regulation, and the system has the advantages of high response speed, convenience, flexibility and high reliability.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the utility model.
Claims (5)
1. The utility model provides a medium voltage direct current power supply system of electrodeless pressure regulating, includes power drive system and control system, its characterized in that: the power driving system comprises a regulating transformer, a rectifier transformer and a pulse wave full-control rectifier device, wherein the regulating transformer is connected with the rectifier transformer through a cable, the rectifier transformer is connected with the pulse wave full-control rectifier device through a cable, and output state signals of the regulating transformer, the rectifier transformer and the pulse wave full-control rectifier device are connected with the control system through a cable and a communication line.
2. The medium-voltage direct-current power supply system with the stepless voltage regulation function as claimed in claim 1, is characterized in that: the pulse wave full-control rectifying device comprises four groups of full-wave rectifying bridges of thyristor trigger circuits.
3. The medium-voltage direct-current power supply system with electrodeless voltage regulation as claimed in claim 1, is characterized in that: the control system comprises a control cabinet and an upper computer, wherein the control cabinet is provided with a remote communication interface and can communicate with the upper computer.
4. The medium-voltage direct-current power supply system with electrodeless voltage regulation as claimed in claim 1, is characterized in that: the rectifier transformer is provided with a low-voltage secondary winding.
5. The electrodeless voltage regulation medium-voltage direct-current power supply system as claimed in claim 3, wherein: the upper computer is an industrial personal computer, corresponding control software is arranged in the industrial personal computer, and the control cabinet is a PLC control cabinet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122494617.1U CN216625604U (en) | 2021-10-15 | 2021-10-15 | Medium-voltage direct-current power supply system with stepless voltage regulation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122494617.1U CN216625604U (en) | 2021-10-15 | 2021-10-15 | Medium-voltage direct-current power supply system with stepless voltage regulation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216625604U true CN216625604U (en) | 2022-05-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122494617.1U Active CN216625604U (en) | 2021-10-15 | 2021-10-15 | Medium-voltage direct-current power supply system with stepless voltage regulation |
Country Status (1)
| Country | Link |
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| CN (1) | CN216625604U (en) |
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2021
- 2021-10-15 CN CN202122494617.1U patent/CN216625604U/en active Active
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