CN215300266U

CN215300266U - Hot standby control system of high-voltage frequency converter

Info

Publication number: CN215300266U
Application number: CN202121960963.8U
Authority: CN
Inventors: 张树林; 陈万燕; 钱永; 何磊
Original assignee: Hope Senlan Science & Technology Corp ltd
Current assignee: Hope Senlan Science & Technology Corp ltd
Priority date: 2021-08-20
Filing date: 2021-08-20
Publication date: 2021-12-24
Anticipated expiration: 2031-08-20

Abstract

The utility model relates to a high-voltage inverter hot standby control system, this control system include human-computer interface, signal coordination board, two high-voltage inverter, two sets of electric wire netting, circuit breaker QF1, QF2, contactor KM1, KM2 and load motor M. The human-computer interface is in communication connection with the signal coordination board through RS485, the two high-voltage frequency converters are in communication connection through CAN, the two high-voltage frequency converters are in communication connection with the signal coordination board through CAN, the two groups of power grids are respectively in series connection with the circuit breakers QF1 and QF2, the two high-voltage frequency converters and the contactors KM1 and KM2, and the other ends of the contactors KM1 and KM2 are connected with each other and then connected to the load motor M. The utility model discloses a hot stand-by state is realized to two high-voltage inverter, switches to another unloaded high-voltage inverter when the high-voltage inverter in service breaks down, has avoided leading to the enterprise to stop production because of the converter trouble, and this system can improve control system's stability and reliability greatly simultaneously.

Description

Hot standby control system of high-voltage frequency converter

Technical Field

The utility model relates to a hot standby control system of high-voltage inverter belongs to high-voltage inverter control technical field.

Background

At present, a single high-voltage frequency converter is generally adopted for controlling a high-voltage motor to regulate speed, and most of the high-voltage frequency converters adopt a topological structure formed by serially connecting multi-stage power units, so that a system is large and complex. When the frequency converter breaks down in the operation process, if the bypass function of the frequency converter cannot realize the operation of the frequency converter, the frequency converter stops operating, so that economic loss is caused to customers, and particularly in important load occasions, the production shutdown and production halt of enterprises are caused by the frequency converter faults, so that huge economic loss is caused to the enterprises.

Disclosure of Invention

To above problem, the utility model provides a simple and reliable high-voltage inverter heat reserve control system.

In order to achieve the above purpose, the utility model provides a scheme is: a high-voltage frequency converter hot standby control comprises a human-computer interface, a signal coordination board, a 1# high-voltage frequency converter, a 2# high-voltage frequency converter, an AC1 power grid, an AC2 power grid, a breaker QF1, a breaker QF2, a contactor KM1, a contactor KM2 and a load motor M. The man-machine interface is connected with the signal coordination board by RS485 communication, 1# high-voltage inverter, connect by CAN communication between the 2# high-voltage inverter, it is connected by CAN communication respectively with the signal coordination board, the AC1 electric wire netting, the AC2 electric wire netting is connected with circuit breaker QF1, circuit breaker QF2, 1# high-voltage inverter, 2# high-voltage inverter, contactor KM1, contactor KM2 are established ties respectively, contactor KM1, load motor M is received to contactor KM2 other end interconnect back.

As a further improvement, the sampling of the output voltage of the high-voltage frequency converter adopts high-resistance sampling.

As a further improvement, the transmission data between the frequency converters adopts CAN communication.

As the utility model discloses a further improvement, the redundant switching of trouble adopts the rotational speed tracking mode between 1# high-voltage inverter, the 2# high-voltage inverter.

As the utility model discloses a further improvement, no output reactor of 1# high-voltage inverter, 2# high-voltage inverter's output, trouble converter switches and does not have impulse current in the twinkling of an eye.

Compared with the prior art, the utility model, the beneficial effect who has is:

1. the system adopts a fault redundancy design mode, so that the operation of a load motor is not influenced, and the reliability of the system is improved;

2. the two high-voltage frequency converters of the system are connected by CAN communication, so that the fault switching time is short, no impact current exists at the moment of fault switching, and the reliability and stability of the system are improved;

3. the output of the system is free of reactors, so that the input cost is reduced.

Drawings

Fig. 1 is a schematic diagram of a hot standby control system of a high-voltage inverter.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and the structural and schematic embodiments of the control system.

Fig. 1 shows a hot standby control system of a high-voltage inverter, which includes: the touch screen is used as a human-computer interface, and the signal coordination board, the 1# high-voltage frequency converter, the 2# high-voltage frequency converter, an AC1 power grid, an AC2 power grid, a breaker QF1, a breaker QF2, a contactor KM1, a contactor KM2 and a load motor M are arranged on the touch screen. Man-machine interface with the signal coordination board is connected by the RS485 communication, connect by the CAN communication between 1# high-voltage inverter, the 2# high-voltage inverter, its with the signal coordination board is connected by the CAN communication respectively, AC1 electric wire netting, AC2 electric wire netting with circuit breaker QF1, circuit breaker QF2, 1# high-voltage inverter, the 2# high-voltage inverter, contactor KM1, contactor KM2 are established ties respectively, contact KM1, contact KM2 other end interconnect are received load motor M.

The human-computer interface is used for monitoring the running states of the 1# and the 2# high-voltage frequency converters in real time;

the signal coordination board is used for collecting real-time operation data of the 1# and 2# high-voltage frequency converters;

the 1# and 2# high-voltage frequency converters are used for controlling the operation of the load motor M and the redundancy switching during the failure;

the circuit breakers QF1 and QF2 are used for controlling connection and disconnection between the input end of the corresponding high-voltage frequency converter and a power grid;

the contactors KM1 and KM2 are used for controlling connection and disconnection between the output end of the corresponding high-voltage frequency converter and the load motor M, and the contactors KM1 and KM2 are in an interlocking relationship.

The hot standby control system of the high-voltage frequency converter comprises the following specific implementation steps:

manual combined floodgate circuit breaker QF1, QF2, the system gets the electricity, set up corresponding operating parameter through the respective human-computer interface of 1# two high-voltage inverter of load motor M parameter and load rate, accomplish and operate 1# simultaneously after the setting, two high-voltage inverter of 2#, control contactor KM1, arbitrary a set of closure of KM2, it is in the area load running state that it corresponds the high-voltage inverter, another high-voltage inverter is in idle load state, signal coordination board and 1#, two high-voltage inverter of 2# are by CAN communication connection, gather the operating data transmission of 1#, two high-voltage inverter of 2# in real time to human-computer interface, realize the remote monitoring to two high-voltage inverter of 1#, 2 #.

When the running high-voltage frequency converter has a fault, after an internal main control board receives a fault signal, the current running data is transmitted to the high-voltage frequency converter in an unloaded state through CAN communication instantly, switches on two sides of the high-voltage frequency converter are disconnected, and a fault switching instruction is sent, so that the high-voltage frequency converter in the unloaded state is put into on-load running, the switching time is less than 100 milliseconds, the current frequency, the rotating speed and the voltage of the motor are judged according to the residual magnetic voltage of the motor after the switching is finished, the tracking starting of the rotating speed is realized, the running frequency before the shutdown of the frequency converter is reached, and the normal running is realized; when the output end of the frequency converter has no motor load, the frequency converter is directly and quickly switched to another frequency converter, so that the normal operation of the frequency converter is realized.

The utility model discloses two high-voltage inverter input power supplies power respectively by two sets of high-voltage electric wire netting, and when the high-voltage inverter under the on-load state was because of its electric wire netting tripping operation, can not influence the high-voltage inverter under the no-load state and normally switch, then can not influence the normal production of enterprise.

The above description is only the preferred embodiment of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, several variations and modifications can be made, and these should also be considered as belonging to the protection scope of the present invention.

Claims

1. The utility model provides a high-voltage inverter hot standby control system, includes human-computer interface, signal coordination board, 1# high-voltage inverter, 2# high-voltage inverter, AC1 electric wire netting, AC2 electric wire netting, circuit breaker QF1, circuit breaker QF2, contactor KM1, contactor KM2 and load motor M, its characterized in that: man-machine interface with the signal coordination board is connected by the RS485 communication, connect by the CAN communication between 1# high-voltage inverter, the 2# high-voltage inverter, its with the signal coordination board is connected by the CAN communication respectively, AC1 electric wire netting, AC2 electric wire netting with circuit breaker QF1, circuit breaker QF2, 1# high-voltage inverter, the 2# high-voltage inverter, contactor KM1, contactor KM2 are established ties respectively, contact KM1, contact KM2 other end interconnect are received load motor M.

2. The hot standby control system of the high-voltage frequency converter according to claim 1, wherein: the high-voltage frequency converter adopts high-resistance sampling for sampling the output voltage.

3. The hot standby control system of the high-voltage frequency converter according to claim 1, wherein: CAN communication is adopted for data transmission between the frequency converters.

4. The hot standby control system of the high-voltage frequency converter according to claim 1, wherein: and the 1# high-voltage frequency converter and the 2# high-voltage frequency converter are switched in a fault redundancy mode by adopting a rotating speed tracking mode.

5. The hot standby control system of the high-voltage frequency converter according to claim 1, wherein: the output ends of the 1# high-voltage frequency converter and the 2# high-voltage frequency converter are not provided with output reactors, and the fault frequency converter is switched to be instantly provided with no impact current.