CN215817939U

CN215817939U - Mining four-quadrant frequency converter control system

Info

Publication number: CN215817939U
Application number: CN202121390746.XU
Authority: CN
Inventors: 申化波; 范素芳; 赵旭亮; 范素峰; 吴北平
Original assignee: Shanxi Ji'an Electric Co ltd
Current assignee: Shanxi Ji'an Electric Co ltd
Priority date: 2021-06-22
Filing date: 2021-06-22
Publication date: 2022-02-11
Anticipated expiration: 2031-06-22

Abstract

The utility model relates to a mining four-quadrant frequency converter control system, belonging to the technical field of four-quadrant frequency converter control; the technical problem to be solved is as follows: the improvement of the hardware structure of the control system of the mining four-quadrant frequency converter is provided; the technical scheme for solving the technical problems is as follows: the circuit comprises peripheral devices, a controllable rectifying unit and an inverting unit, wherein the peripheral devices comprise an isolating switch QS1, a main loop fuse group F1, an input reactor LA1, a filter capacitor group C1, a feedback reactor LA2, a buffer contactor KM1 and a buffer resistor group R1; the controllable rectifying unit comprises an IGBT and a rectifying control and display module; the inversion unit comprises an IGBT, an inversion control and display module, a touch screen, an upper computer and a control relay, wherein the upper computer is communicated with the touch screen, and the touch screen is communicated with the controllable rectification unit and the inversion unit; the upper computer controls the control relay and is respectively communicated with the controllable rectifying unit and the inversion unit through wires; the utility model is applied to the four-quadrant frequency converter.

Description

Mining four-quadrant frequency converter control system

Technical Field

The utility model discloses a mining four-quadrant frequency converter control system, and belongs to the technical field of frequency converter control systems.

Background

At present, with the development of mining technology, a frequency converter is gradually applied to a coal mine as a power supply device, and particularly for some special application occasions such as a belt conveyor, a hoisting winch and the like, the four-quadrant frequency converter has the obvious advantages of good braking effect, high control precision, prolonged service life of mechanical equipment and the like, so that the frequency converter is approved and commented by coal mine users and is continuously popularized.

At present, the mining four-quadrant frequency converter generally adopts a traditional design scheme, and the structure of the design scheme is composed of a peripheral device, a controllable rectifying unit and an inverting unit, as shown in figure 1: the peripheral device includes: the circuit comprises an isolating switch QS1, a main loop fuse group F1, an input reactor LA1, a filter capacitor group C1, a feedback reactor LA2, a buffer contactor KM1 and a buffer resistor group R1. The controllable rectifying unit U1 includes: IGBT, ZL _ MODULE (rectification control and display MODULE). The inverter unit U2 includes: IGBT, NB _ MODULE (inverter control and display MODULE).

The working principle of the mode is as follows: after the system is powered on by L1, L2 and L3, QS1 is isolated and switched on, a filter capacitor group C2 starts to be charged, the charged system is in a standby state, when the system needs to be operated, ZL _ MOUDLE (a rectification control and display MODULE) is operated to start a controllable rectification unit U1, a buffer contactor KM1 follows the operation, NB _ MODULE (an inversion control and display MODULE) is operated to start an inversion unit U2, and therefore the system is in an operation state; when the system needs to be stopped, the NB _ MODULE (inversion control and display MODULE) is operated to stop the inversion unit U2, and then the ZL _ MODULE (rectification control and display MODULE) is operated to stop the controllable rectification unit U1, at which time the system is in the standby state again.

In general, the mode control principle is simple, and has the following disadvantages: firstly, the human-computer interfaces of the controllable rectifying unit U1 and the inversion unit U2 depend on a self-contained display system (digital tube displays are more), the display content is less, the data is not visual, the interface is not friendly, and the user is not convenient to know the information of the equipment; secondly, in actual on-load operation (such as a load motor M), the four-quadrant system requires rectification before inversion during starting; when the machine is stopped, the machine is required to be inverted firstly and then rectified. In the mode, the starting and stopping operations of the controllable rectifying unit U1 are controlled by ZL _ MODULE (rectifying control and display MODULE), the starting and stopping operations of the inverting unit U2 are controlled by NB _ MODULE (inverting control and display MODULE), reliable interlocking and logic connection are not formed between the units, and in the field operation process, due to manual misoperation, the situation that the inversion is started firstly and then the rectifying is started is often existed in the starting process, or the situation that the rectification is stopped firstly and then the inversion is stopped is often existed in the shutdown process, and the misoperation easily causes the damage of the IGBT and the capacitor bank C2.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects in the prior art, the utility model aims to solve the technical problems that: the improvement of the hardware structure of the control system of the mining four-quadrant frequency converter is provided.

In order to solve the technical problems, the utility model adopts the technical scheme that: the utility model provides a mining four-quadrant converter control system, includes peripheral device, controllable rectifier unit and contravariant unit, and the peripheral device includes: an isolating switch QS1, a main loop fuse group F1, an input reactor LA1, a filter capacitor group C1, a feedback reactor LA2, a buffer contactor KM1 and a buffer resistor group R1; the controllable rectifying unit U1 includes: the IGBT and the rectification control and display module; the inverter unit U2 includes: the system comprises an IGBT, an inversion control and display module, a touch screen, an upper computer, control relays K1 and K2, wherein the upper computer is communicated with the touch screen through a TCP standard protocol, and the touch screen is communicated with a controllable rectifying unit U1 and an inversion unit U2 through serial ports;

the upper computer performs suction and breaking control on the control relays K1 and K2, and communicates with the controllable rectifying unit U1 and the inversion unit U2 through leads respectively.

The upper computer specifically adopts a PLC with the model number of S7-1200.

The touch screen is specifically a Chinese liquid crystal touch screen HMI, a human-computer interaction interface is embedded in the touch screen, data are read from the controllable rectifying unit U1 and the inversion unit U2 in real time through serial port communication, set parameters are written into the controllable rectifying unit U1 and the inversion unit U2, and fault information can be displayed on the touch screen.

The frequency converter control system is powered by an AC220V power supply, and the output end of the inversion unit U2 is connected with a load.

Compared with the prior art, the utility model has the beneficial effects that: the mining four-quadrant frequency converter control system provided by the utility model communicates with the controllable rectifying unit U1 and the inverting unit U2 through the Chinese liquid crystal touch screen HMI, and transmits data to the touch screen, so that a user can intuitively master the detailed information of U1 and U2 and conveniently set parameters; the control of U1 and U2 is not finished by ZL _ MODULE and NB _ MODULE, controls are directly operated on an HMI, then the PLC controls the intermediate relays K1 and K2 to act according to a logical relation, and finally controls the U1 and U2 to start or stop, so that the manual misoperation of starting the rectifying unit after starting the inverting unit or stopping the rectifying unit after stopping the inverting unit is avoided, and the four-quadrant frequency conversion system is enabled to operate strictly according to the operation flow of starting the rectifying unit before starting the inverting unit before stopping the rectifying unit. Thus, damage to the IGBT or the filter capacitor C2 caused by bus overvoltage caused by misoperation is avoided. Meanwhile, the PLC monitors the state feedback signals of the U1 and the U2 in real time, and prompt information can be displayed on the HMI in time when the signals are abnormal, so that an operator is helped to perform troubleshooting.

Drawings

The utility model is further described below with reference to the accompanying drawings:

FIG. 1 is a circuit diagram of a control system of a four-quadrant inverter in the prior art;

fig. 2 is a circuit diagram of a control system of the four-quadrant frequency converter of the present invention.

Detailed Description

As shown in fig. 1 and 2, the mining four-quadrant frequency converter control system of the present invention includes a peripheral device, a controllable rectifying unit and an inverting unit, wherein the peripheral device includes: an isolating switch QS1, a main loop fuse group F1, an input reactor LA1, a filter capacitor group C1, a feedback reactor LA2, a buffer contactor KM1 and a buffer resistor group R1; the controllable rectifying unit U1 includes: the IGBT and the rectification control and display module; the inverter unit U2 includes: the system comprises an IGBT, an inversion control and display module, a touch screen, an upper computer, control relays K1 and K2, wherein the upper computer is communicated with the touch screen through a TCP standard protocol, and the touch screen is communicated with a controllable rectifying unit U1 and an inversion unit U2 through serial ports;

The upper computer specifically adopts a PLC with the model number of S7-1200.

Aiming at the defects of the prior art mentioned in the background technology, the control system of the four-quadrant frequency converter shown in the figure 2 is provided, an upper computer PLC (S7-1200) and a Chinese liquid crystal touch screen HMI are added, and the upper computer PLC and the Chinese liquid crystal touch screen HMI communicate through a TCP standard protocol; the Chinese liquid crystal touch screen HMI adopts a serial port CAN-JA custom communication protocol to communicate with the controllable rectifying unit U1 and the inverter unit U2, reads data (working current, frequency, bus voltage and the like) from the U1 and the U2 in real time, and CAN write set parameters (such as parameters of a load motor, a control mode, a command source, a frequency source and the like) into the U1 and the U2.

The utility model adds control relays K1 and K2, an upper computer PLC (S7-1200) performs suction and breaking control on the control relays through output points Q0.1 and Q0.2, and simultaneously a controllable rectifying unit and an inverter unit send respective state feedback signals to the upper computer PLC.

FIG. 2 the control principle of the present invention is: the user controls the controllable rectifying unit U1 and the inversion unit through the controls in the HMI, namely when the system needs to run, the user operates the starting control in the HMI, the PLC first controls the K1 to suck, the K1 auxiliary contact K1 (3, 4) is closed to control the action of ZL _ MODULE (rectifying control and display MODULE), so that the U1 starts to run, the U1 sends a state feedback signal to the PLC after running, the PLC receives the signal and controls the K2 to suck, the K2 auxiliary contact K2 (3, 4) is closed to control the action of NB _ MODULE (inversion control and display MODULE), the U2 starts to run and sends the state feedback signal to the PLC, and the starting process of the system is finished; meanwhile, when the system needs to be shut down, a user operates a stop control in the HMI, the PLC firstly controls K2 to be disconnected, the auxiliary contact K2 (3 and 4) of the K2 is opened and then controls NB _ MODULE (inverter control and display MODULE) to act, so that the U2 is shut down and sends a state feedback signal to the PLC, the PLC receives the state signal of the U2 and then controls K1 to be disconnected, the auxiliary contact K1 (3 and 4) of the K1 is opened and then controls ZL _ MODULE (rectifier control and display MODULE) to act, then the U1 is shut down and sends the state signal to the PLC, and the shutdown process of the system is completed.

In the control process of the system, the detailed logic relationship is as follows:

1. in the starting process, the PLC firstly controls the K1 to suck, simultaneously detects a state feedback signal of the controllable rectifying unit U1, and if the feedback signal is operated, the PLC continues to control the K2 to suck; if the operation feedback signal is not received, the K2 does not act, the K1 is controlled to be disconnected, and meanwhile fault information ' the system cannot be started normally due to the fact that the controllable rectifying unit does not operate, please check a control circuit of the rectifying unit ' is displayed on the HMI '.

2. In the process of stopping the machine, the PLC firstly controls the K2 to be disconnected, simultaneously detects a state feedback signal of the inverter unit U2, and if the state feedback signal of the U2 is received, the PLC continues to control the K1 to be disconnected; if the shutdown feedback signal of the U2 is not received, the K1 does not act, and simultaneously fault information ' the inverter unit cannot be normally shut down and please check a control circuit of the inverter unit ' is displayed on the HMI '.

3. During the operation process, the PLC detects the state feedback signals of the controllable rectifying unit U1 and the inverter unit in real time, the two feedback signals are in operation under normal conditions, if the state feedback signal of the U1 is detected to be shutdown, the K2 and the K1 are controlled to be disconnected in sequence, and meanwhile fault information ' the controllable rectifying unit is abnormally stopped, please check a control circuit of the controllable rectifying unit ' is displayed on the HMI '.

It should be noted that, regarding the specific structure of the present invention, the connection relationship between the modules adopted in the present invention is determined and can be realized, except for the specific description in the embodiment, the specific connection relationship can bring the corresponding technical effect, and the technical problem proposed by the present invention is solved on the premise of not depending on the execution of the corresponding software program.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the utility model has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. The utility model provides a mining four-quadrant converter control system, includes peripheral device, controllable rectifier unit and contravariant unit, and the peripheral device includes: an isolating switch QS1, a main loop fuse group F1, an input reactor LA1, a filter capacitor group C1, a feedback reactor LA2, a buffer contactor KM1 and a buffer resistor group R1; the isolation switch QS1, the main loop fuse group F1, the input reactor LA1, the feedback reactor LA2 and the buffer contactor KM1 are sequentially connected in series on the main loop, a filter capacitor group C1 is connected between the input reactor LA1 and the feedback reactor LA2, and two ends of the buffer contactor KM1 are connected with a buffer battery group R1 in parallel;

the controllable rectifying unit U1 includes: the IGBT is connected with the rectification control and display module;

the inverter unit U2 includes: the IGBT is connected with the inversion control and display module;

the method is characterized in that: the system comprises a touch screen, an upper computer, control relays K1 and K2, wherein the upper computer is communicated with the touch screen through a TCP standard protocol, and the touch screen is communicated with a controllable rectifying unit U1 and an inverting unit U2 through serial ports;

output points Q0.1 and Q0.2 of the upper computer are respectively connected with coils of control relays K1 and K2, wherein a normally open contact of the control relay K1 is connected with a controllable rectifying unit U1, and a normally open contact of the control relay K2 is connected with an inverting unit U2;

2. The mining four-quadrant frequency converter control system according to claim 1, characterized in that: the upper computer specifically adopts a PLC with the model number of S7-1200.

3. The mining four-quadrant frequency converter control system according to claim 2, characterized in that: the touch screen is specifically a Chinese liquid crystal touch screen HMI, a human-computer interaction interface is embedded in the touch screen, data are read from the controllable rectifying unit U1 and the inversion unit U2 in real time through serial port communication, set parameters are written into the controllable rectifying unit U1 and the inversion unit U2, and fault information can be displayed on the touch screen.

4. The mining four-quadrant frequency converter control system according to claim 2, characterized in that: the frequency converter control system is powered by an AC220V power supply, and the output end of the inversion unit U2 is connected with a load.