CN219554830U - Intelligent active filtering voltage stabilizing device for railway - Google Patents

Abstract

The utility model relates to the technical field of transformer substations, and discloses an intelligent active filtering voltage stabilizing device for a railway, which comprises an input terminal block, a rectifying module AC/DC, an inversion module DC/AC, a filtering capacitor II and an output terminal block which are sequentially connected in sequence, wherein the input terminal block inputs unbalanced voltage to the rectifying module AC/DC through a circuit breaker to convert alternating current into direct current, the rectifying module AC/DC outputs the direct current to the inversion module DC/AC to be converted into alternating current, the alternating current is output to the filtering capacitor through a transformer to filter clutter, and the clutter is output to the output terminal block through a main circuit contactor to obtain stable voltage, and the input terminal block is also connected with a bypass contactor which is connected to the output terminal block.

Description

Intelligent active filtering voltage stabilizing device for railway

Technical Field

The utility model relates to the technical field of substations, in particular to an intelligent active filtering voltage stabilizing device for a railway.

Background

At present, with the high-speed development of electrified railways, higher and higher requirements are put on the safety and reliability of power supplies. Because of the large fluctuation range of the power supply voltage, more harmonic components, strong interference and other reasons,

an electrified railway is a single-phase, rectified, asymmetric fluctuating load. Because of the specificity of railway transportation, the electric iron traction load fluctuates frequently and changes severely, and adverse effects such as voltage fluctuation, reactive power, harmonic waves, negative sequences and the like can be generated on a traction power supply system. The harm caused by voltage fluctuation comprises overvoltage of equipment, insulation threat, service life reduction, incapacitation of normal start operation or stop of user equipment and electric appliances, influence on normal operation of users, interference on normal operation of voltage sensitive electronic equipment and instruments such as computers and the like. The harm caused by the harmonic wave includes that reactive compensation equipment cannot work normally, electric equipment such as a transformer, a generator and the like generates heat abnormally, misoperation is protected, automatic equipment is out of order, communication is disturbed and the like. The damage caused by the negative sequence component comprises abnormal heating and vibration of a nearby generator set, worsening of the running condition of the three-phase asynchronous motor, difficult starting, protection of misoperation and the like. The voltage stabilizing range of the existing voltage stabilizer is generally between 10% and 20%, and the existing voltage stabilizer has no function of filtering higher order or multiple harmonic waves. Because of the specificity of the electrified railway system, terminal voltage which is more than or less than 50% of the voltage of the input terminal and higher harmonics such as 3 times, 5 times, 7 times, … … and the like can appear at the 308V/220V voltage input terminal, the existing voltage stabilizer has a narrow voltage stabilizing range and long reaction time, and the higher/multiple harmonics cannot be filtered, so that the elements of the AC system of the secondary control room are burnt to influence the normal operation of the whole railway system, and great potential safety hazards are brought.

Disclosure of Invention

In order to overcome the defects of the prior art, the utility model provides an intelligent active filtering voltage stabilizing device for a railway, which has the advantages of wide voltage stabilizing range, long voltage stabilizing time and capability of filtering higher/multiple harmonic waves.

In order to achieve the above purpose, the present utility model provides the following technical solutions: the intelligent active filtering voltage stabilizing device for the railway comprises an input terminal block, a rectifying module AC/DC, an inversion module DC/AC, a filtering capacitor II and an output terminal block which are sequentially connected, wherein the input terminal block inputs unbalanced voltage to the rectifying module AC/DC through a circuit breaker to convert alternating current into direct current, the rectifying module AC/DC outputs the direct current to the inversion module DC/AC to be converted into alternating current, and the alternating current is output to the filtering capacitor II through a transformer to filter clutter, and then the clutter is output to the output terminal block through a main circuit contactor to obtain stable voltage;

the input terminal block is also connected with a bypass contactor, which is connected to the output terminal block.

Preferably, the rectifying module AC/DC includes a power tube connected to an inductor, where the inductor is connected to a filter capacitor and outputs current to the inverting module DC/AC after the current is filtered by the filter capacitor.

Preferably, the inversion module DC/AC comprises several groups of IGBTs, which are inverted to output alternating current.

Preferably, the voltage stabilizing device further comprises an auxiliary source module, a control module and a driving module which are sequentially connected, wherein the auxiliary source module is used for providing stable voltage for the whole loop, the control module and the driving module are connected with a touch display screen through an ARM board, the driving module is connected with an inversion module DC/AC, and given signals are input through the touch display screen and then are sent to the inversion module DC/AC through the driving module to enable the inversion module DC/AC to work stably.

Preferably, the ARM board comprises a signal processing module, and the signal processing module is connected with the control module and the touch display screen and receives a system fault signal sent by the control module and feeds the system fault signal back to the touch display screen and processes faults.

Preferably, the control module is connected with the rectification module AC/DC through an IO board, the IO board and the control module are connected with given control signals, pins of the IO board are connected with the bus to give input signals, and pins of the IO board are connected with the rectification module AC/DC to give rectification signals.

Compared with the prior art, the utility model has the following beneficial effects:

1. the utility model ensures that the load end and the mains supply input end are in a good electric isolation state, the output waveform is good, the output voltage quality is high, and the excellent load characteristic can be maintained even if the load suddenly changes; the frequency stabilization and voltage stabilization power supply to the load can be realized, and a high-quality voltage stabilization and frequency stabilization pure sine wave power supply can be truly provided for a user, so that a power supply meeting the requirements of a railway system is provided; the protection solves the problem of unstable voltage such as overvoltage, undervoltage and the like, has wide voltage stabilizing range and long voltage stabilizing time, and can filter out higher/multiple harmonic waves.

2. The utility model is a highly integrated and automatically controlled electrical industrial product. The existing product can solve the problem of voltage fluctuation, but can not solve the problems of clutter, power quality, voltage distortion rate and the like. The equipment can be switched to the bypass mode when faults exist in the equipment, and can be switched to the bypass mode under the condition of overhauling, so that the use of the back-end equipment is not affected in a short time.

Drawings

FIG. 1 is a schematic diagram of a system of the present utility model;

FIG. 2 is a schematic diagram of the structure of the present utility model;

fig. 3 is a schematic diagram of the present utility model.

In the figure: 1. an input terminal block; 2. a circuit breaker; 3. a rectification module AC/DC; 31. a power tube; 32. an inductance; 33. a first filter capacitor; 4. an inversion module DC/AC; 5. a transformer; 6. a second filter capacitor; 7. a main circuit contactor; 8. a bypass contactor; 9. an output terminal block; 10. an auxiliary source module; 11. a control module; 12. a driving module; 13. an IO board; 14. ARM board; 15. touching the display screen; 16. a heat radiation fan; 17. a soft start loop; 18. soft-start resistance; 19. and a secondary circuit.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

As shown in fig. 1 to 3, the utility model provides an intelligent active filtering voltage stabilizing device for a railway, which comprises an input terminal block 1, a rectifying module AC/DC3, an inverting module DC/AC4, a second filtering capacitor 6 and an output terminal block 9 which are sequentially connected, wherein the input terminal block 1 inputs unbalanced voltage to the rectifying module AC/DC3 through a circuit breaker 2 to convert alternating current into direct current, the rectifying module AC/DC3 outputs the direct current to the inverting module DC/AC4 to convert the direct current into alternating current and outputs the alternating current to the second filtering capacitor 6 through a transformer 5 to filter clutter, and the clutter is output to the output terminal block 9 through a main circuit contactor 7 to obtain stable voltage;

the input terminal block 1 is also connected with a bypass contactor 8, and the bypass contactor 8 is connected to an output terminal block 9.

The rectifying module AC/DC3 comprises a power tube 31 and is connected with an inductor 32, the inductor 32 is connected with a first filter capacitor 33, and current is input to the inverting module DC/AC4 after being filtered by the first filter capacitor 33;

as shown in fig. 2, the secondary loop 19 belongs to the soft start loop 17 and the starting and controlling module is used for limiting the charging current of the filter capacitor 33 when the device is started. The system voltage charges the filter capacitor one 33 with a small current through the soft start resistor 18. After the capacitor voltage reaches 90% of the nominal value, the control system closes the contactor, bypassing the soft start resistor 18. After the first 33 filter capacitor is charged, the person enters a normal working state

The inversion module DC/AC4 comprises IGBT groups, wherein one IGBT group is connected with a voltage positive electrode, and the other IGBT group is connected with a voltage negative electrode.

The voltage stabilizing device further comprises an auxiliary source module 10, a control module 11 and a driving module 12 which are sequentially connected, wherein the auxiliary source module 10 is used for providing stable voltage for the whole loop, the control module 11 and the driving module 12 are connected with a touch display screen 15 through an ARM board, the driving module 12 is connected with an inversion module DC/AC4, and a given signal is input through the touch display screen 15 and is sent to the inversion module DC/AC4 through the driving module 12 to enable the inversion module DC/AC4 to work stably.

The ARM board comprises a signal processing module, wherein the signal processing module is connected with the control module 11 and the touch display screen 15, receives a system fault signal sent by the control module 11, and feeds back the system fault signal to the touch display screen 15 and processes faults.

The control module 11 is connected with the rectification module AC/DC3 through the IO board 13, the IO board 13 is triggered by input overvoltage and undervoltage+rectification, the SCR control board is connected with a given control signal, a pin is connected with a bus for giving an input signal, and the pin is connected with the rectification module for giving a rectification signal.

The working principle and the using flow of the utility model are as follows:

the intelligent harmonic voltage stabilizing and managing device for the railway is characterized by comprising a breaker (QF), a rectifying module, an inversion module, a transformer, a filter capacitor, a main circuit and a bypass contactor which are sequentially connected. The auxiliary source circuit is connected behind the QF, the rectifying module is internally provided with an SCR control module, the inversion part is internally provided with a driving plate module, the SCR control module is connected with an IO plate, the driving module is mutually connected with a control plate, the IO plate is mutually connected with a total control plate, the total control plate is mutually connected with a touch display screen, and the front end of the output terminal is provided with a cooling fan of the whole device. The auxiliary source circuit provides power for the whole control module, the IO board, the driving module, the control board and the touch display screen.

The device is connected with an unbalanced power supply through QF, stable electricity is output by the contactor through a series of treatments of the rectifying module, the inverting module, the transformer and the filter capacitor, and the stability of the device is ensured through the control and the connection between each control module and other modules. When the equipment has problems, the output can be directly bypassed, and the power supply is not influenced in a short time.

It is noted that relational terms such as first and second, and the like are 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. Moreover, 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 utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims (6)

1. An intelligent active filtering voltage stabilizing device for a railway is characterized in that: the power supply device comprises an input terminal block (1), a rectifying module AC/DC (3), an inverting module DC/AC (4), a filter capacitor II (6) and an output terminal block (9) which are sequentially connected, wherein the input terminal block (1) inputs unbalanced voltage to the rectifying module AC/DC (3) through a circuit breaker (2) to convert alternating current into direct current, the rectifying module AC/DC (3) inputs the direct current to the inverting module DC/AC (4) to be converted into alternating current and outputs the alternating current to the filter capacitor II (6) through a transformer (5) to filter clutter, and the alternating current is then transmitted to the output terminal block (9) through a main circuit contactor (7) to obtain stable voltage;

the input terminal block (1) is also connected with a bypass contactor (8), and the bypass contactor (8) is connected to the output terminal block (9).

2. The intelligent active filtering voltage stabilizing device for railways according to claim 1, wherein: the rectification module AC/DC (3) comprises a power tube (31) and an inductor (32), wherein the inductor (32) is connected with a first filter capacitor (33) and outputs current to the inversion module DC/AC (4) after the first filter capacitor (33) filters the current.

3. The intelligent active filtering voltage stabilizing device for railways according to claim 1, wherein: the inversion module DC/AC (4) comprises a plurality of groups of IGBTs, and the inversion of the IGBT groups outputs alternating current.

4. The intelligent active filtering voltage stabilizing device for railways according to claim 1, wherein: the voltage stabilizing device further comprises an auxiliary source module (10), a control module (11) and a driving module (12) which are sequentially connected, the auxiliary source module (10) is used for providing stable voltage for the whole loop, the control module (11) and the driving module (12) are connected with a touch display screen (15) through an ARM board, the driving module (12) is connected with an inversion module DC/AC (4), and given signals are input through the touch display screen (15) to the inversion module DC/AC (4) through the driving module (12) to enable the inversion module DC/AC to work stably.

5. The intelligent active filtering voltage stabilizing device for railways according to claim 4, wherein: the ARM board comprises a signal processing module, wherein the signal processing module is connected with the control module (11) and the touch display screen (15) and receives a system fault signal sent by the control module (11) to feed back to the touch display screen (15) and process faults.

6. The intelligent active filtering voltage stabilizing device for railways according to claim 4, wherein: the control module (11) is connected with the rectification module AC/DC (3) through the IO board (13), the IO board (13) and the control module (11) are connected with given control signals, pins of the IO board (13) are connected with buses to give input signals, and pins of the IO board (13) are connected with the rectification module AC/DC (3) to give rectification signals.