Frequency conversion control system based on full redundancy design

Abstract

The utility model relates to a frequency conversion control system based on full redundancy design, which comprises a power distribution unit, a man-machine interaction unit, a plurality of groups of frequency conversion controller units and a plurality of groups of instrument and meter units, and is characterized in that the power distribution unit is electrically connected to the man-machine interaction unit, the plurality of groups of frequency conversion controller units and the plurality of groups of instrument and meter units; the power distribution unit is responsible for on-off switching and electrical protection of the man-machine interaction unit, the multiple groups of frequency conversion controller units and the multiple groups of instrument and meter units. And one of the multiple groups of variable frequency controller units is matched with one of the multiple groups of instrument units, and the matched variable frequency controller units are connected to the man-machine interaction unit in parallel. The system is a frequency conversion water supply system based on full redundancy design of a frequency conversion controller power supply, a man-machine interaction unit, a control power supply unit, an outlet pressure transmitter unit and the like, and automatic water supply and monitoring display of the system cannot be affected when any unit breaks down or is disconnected.

Description

Technical Field

[0001] This utility model relates to a frequency conversion control system, specifically a frequency conversion control system based on full redundancy design in which the automatic water supply and monitoring display are not affected by the failure or disconnection of any unit in the system. Background Technology

[0002] As people's living standards continue to improve, they also have higher demands for the quantity, pressure, quality, user experience, and services of their daily water use. Therefore, safe, reliable, and efficient water supply has become an urgent need for both users and water supply companies.

[0003] Due to the harsh environment of pump rooms, such as humidity and dust, the failure rate of frequency converters in traditional variable frequency water supply control systems is approximately 0.4%, the failure rate of controllers is approximately 0.7%, and the failure rate of control power supplies is approximately 0.45%. The reliability research and development of variable frequency water supply control systems is a crucial measure to ensure safe and reliable water supply.

[0004] Currently, the control system of secondary pressurization and regulation water supply facilities mainly consists of a power distribution unit (power supply and control power supply), a frequency converter unit, a controller unit, a human-machine interface unit, and an instrumentation unit. Existing frequency conversion water supply control systems have relatively independent units, lacking redundancy design. In particular, the control power supply and controller units are prone to failure; a failure in any one of these units will cause system shutdown. The main pressure transmitter is configured with only one unit, and its failure will prevent the system from achieving constant pressure water supply. Furthermore, a control power supply failure will also cause the human-machine interface power supply, instrumentation unit, and controller unit to malfunction. Utility Model Content

[0005] To address the aforementioned problems, the main objective of this utility model is to provide a variable frequency control system based on a fully redundant design, in which the automatic water supply and monitoring display are not affected by the failure or disconnection of any unit in the system.

[0006] The present invention solves the above-mentioned technical problems through the following technical solution: a frequency conversion control system based on full redundancy design, wherein the frequency conversion control system based on full redundancy design includes: a power distribution unit, a human-machine interaction unit, multiple sets of frequency conversion controller units, and multiple sets of instrumentation units.

[0007] The power distribution unit is connected to the human-machine interface unit, multiple frequency converter units, and multiple instrumentation units via electrical connections; the power distribution unit is responsible for switching and providing electrical protection for the human-machine interface unit, multiple frequency converter units, and multiple instrumentation units.

[0008] One of the multiple frequency converter controller units is matched with one of the multiple instrumentation units, and the matched units are connected to the human-machine interface unit in parallel.

[0009] In a specific embodiment of this utility model, the human-machine interaction unit includes: a touch screen, an IoT gateway, and a CAN gateway; the CAN gateway is connected to multiple frequency converter units, and the IoT gateway is connected to an external smart water management platform.

[0010] In a specific embodiment of this utility model, each of the multiple sets of frequency converter controller units includes: a frequency converter board, a PLC board, and a monitor board; the frequency converter board is responsible for the drive speed regulation and electrical protection of the motor; the PLC board is responsible for the acquisition of control signals and sensor signals, the logic control and data operation of the water supply system, and supports STEP7-Micro / WIN SMART programming, PPI, Profinet, and Modbus communication protocols; the monitor board displays the operating data and status of the frequency converter and the water supply system, and sets and modifies the parameters of the frequency converter and the water supply system.

[0011] In a specific embodiment of this utility model, each of the multiple instrumentation units includes: one water tank level transmitter, one inlet pressure transmitter, and two outlet pressure transmitters. The outlet pressure transmitters are respectively connected to a No. 1 frequency converter and a No. 2 frequency converter, which serve as backups for each other.

[0012] In a specific embodiment of this utility model, frequency converter #1 and frequency converter #2 are connected to a CAN bus to realize sensor data sharing.

[0013] The positive and progressive effects of this utility model are as follows: Compared with common technologies, the variable frequency control system based on full redundancy design provided by this utility model has the following advantages: This utility model is a variable frequency water supply system based on full redundancy design of variable frequency controller power supply, human-machine interaction unit, control power supply unit, outlet pressure transmitter unit, etc., and the failure or disconnection of any one of these units will not affect the automatic water supply and monitoring display of the system. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model. Detailed Implementation

[0015] The preferred embodiments of this utility model are given below with reference to the accompanying drawings to illustrate the technical solution of this utility model in detail.

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention, as shown below. Figure 1 As shown: This utility model proposes a frequency converter control system based on full redundancy design, which includes: a power distribution unit, a human-machine interaction unit, multiple frequency converter controller units, and multiple instrumentation units.

[0017] The power distribution unit is connected to the human-machine interface unit, multiple frequency converter units, and multiple instrument units via electrical connection. The power distribution unit is responsible for switching and providing electrical protection for the human-machine interface unit, multiple frequency converter units, and multiple instrument units. One of the multiple frequency converter units is matched with one of the multiple instrument units, and the matched units are connected to the human-machine interface unit in parallel.

[0018] This system is a variable frequency water supply system based on a fully redundant design of variable frequency controller power supply, human-machine interaction unit, control power supply unit, outlet pressure transmitter unit, etc. Failure or disconnection of any one of these units will not affect the system's automatic water supply and monitoring display.

[0019] The human-machine interface unit includes a touchscreen, an IoT gateway, and a CAN gateway. The CAN gateway is connected to multiple variable frequency controller units, and the IoT gateway is connected to an external smart water management platform. The CAN gateway monitors the operating status and data of multiple variable frequency controller units, and the IoT gateway enables data interconnection between the variable frequency water supply system and the smart water management platform.

[0020] Each of the multiple variable frequency controller units includes: a frequency converter board, a PLC board, and a monitor board. The frequency converter board is responsible for the motor drive speed regulation and electrical protection. The PLC board is responsible for the acquisition of control signals and sensor signals, the logic control of the water supply system, and data operation. It also supports STEP7-Micro / WIN SMART programming and PPI, Profinet, and Modbus communication protocols. The monitor board displays the operating data and status of the frequency converter and the water supply system, and allows for the setting and modification of the parameters of the frequency converter and the water supply system.

[0021] Each of the multiple instrumentation units includes: one water tank level transmitter, one inlet pressure transmitter, and two outlet pressure transmitters. The outlet pressure transmitters are connected to the No. 1 and No. 2 frequency converters, which serve as backups for each other.

[0022] Below is a specific example:

[0023] In the control system of this utility model, each frequency converter is an independent frequency conversion water supply control system.

[0024] (1) Engineers can use a PC to download the PLC control program to each frequency converter through a gateway;

[0025] (2) Control signals and sensor signals are directly connected to the No. 1 frequency converter and the No. 2 frequency converter;

[0026] (3) The system defaults to 1# frequency converter as the main control system and 2# frequency converter as the backup control system. When 1# frequency converter is powered off or disconnected, the system automatically switches 2# frequency converter as the main control system. The frequency converter control system implements hot standby redundancy, and the system is safe and reliable.

[0027] (4) The main control PLC board of the frequency converter controls the start, stop and debugging of each frequency converter through the CAN bus to realize frequency conversion water supply.

[0028] (5) The two outlet pressure transmitters are connected to the No. 1 frequency converter and the No. 2 frequency converter respectively. Each frequency converter can share sensor data through the CAN bus. When one of the pressure transmitters is disconnected or fails, the system will automatically use the other pressure transmitter as the feedback value to achieve frequency constant pressure water supply.

[0029] (6) The switching power supply can supply power only to the human-machine interaction unit. Even if the switching power supply or the human-machine unit fails, the monitoring board in the frequency converter can still monitor and control the frequency water supply status and data.

[0030] In summary, this system is a variable frequency water supply system based on a fully redundant design of variable frequency controller power supply, human-machine interaction unit, control power supply unit, outlet pressure transmitter unit, etc. Failure or disconnection of any one of these units will not affect the system's automatic water supply and monitoring display.

[0031] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection of this utility model as defined by the appended claims and their equivalents.

Claims

1. A variable frequency control system based on a fully redundant design, characterized in that: The variable frequency control system based on a fully redundant design includes: a power distribution unit, a human-machine interface unit, multiple sets of variable frequency controller units, and multiple sets of instrumentation units. The power distribution unit is connected to the human-machine interface unit, multiple frequency converter units, and multiple instrumentation units via electrical connections; the power distribution unit is responsible for switching the human-machine interface unit, multiple frequency converter units, and multiple instrumentation units on and off and providing electrical protection. One of the multiple frequency converter controller units is matched with one of the multiple instrumentation units, and the matched units are connected to the human-machine interface unit in parallel.

2. The frequency converter control system based on fully redundant design according to claim 1, characterized in that: The human-machine interaction unit includes: a touch screen, an IoT gateway, and a CAN gateway; the CAN gateway is connected to multiple frequency converter units, and the IoT gateway is connected to an external smart water management platform.

3. The frequency converter control system based on fully redundant design according to claim 1, characterized in that: Each of the multiple variable frequency controller units includes: a frequency converter board, a PLC board, and a monitor board. The frequency converter board is responsible for the motor drive speed regulation and electrical protection. The PLC board is responsible for the acquisition of control signals and sensor signals, the logic control of the water supply system, and data operation. It also supports STEP7-Micro / WIN SMART programming and PPI, Profinet, and Modbus communication protocols. The monitor board displays the operating data and status of the frequency converter and the water supply system, and allows for the setting and modification of the parameters of the frequency converter and the water supply system.

4. The frequency converter control system based on fully redundant design according to claim 1, characterized in that: Each of the multiple instrumentation units includes: one water tank level transmitter, one inlet pressure transmitter, and two outlet pressure transmitters. The outlet pressure transmitters are connected to the No. 1 and No. 2 frequency converters, which serve as backups for each other.

5. The frequency converter control system based on fully redundant design according to claim 4, characterized in that: The #1 and #2 frequency converters are connected via a CAN bus to enable sensor data sharing.

Images