Frequency conversion control system based on full redundancy design

Abstract

The invention 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] The present invention relates to a variable frequency control system, and particularly to a variable frequency control system based on full redundancy design in which any unit failure or disconnection will not affect the automatic water supply and monitoring display of the system. Background Art

[0002] With the continuous improvement of people's living standards, there are also higher demands for the water volume, water pressure, water quality, water use experience and services in daily life. Therefore, safe, reliable and efficient water supply has become an urgent need for users and water supply enterprises.

[0003] Due to harsh environmental problems such as humidity and dust in the pump house, in the traditional variable frequency water supply control system, the failure rate of the frequency converter is about 0.4%, the failure rate of the controller is about 0.7%, and the failure rate of the control power supply is about 0.45%. The reliability research, design and development of the variable frequency water supply control system are important measures to ensure safe and reliable water supply.

[0004] At present, the control systems of secondary pressurization and storage water supply facilities mainly consist of a power distribution unit (power supply and control power supply), a frequency converter unit, a controller unit, a human-machine interaction unit, an instrument and meter unit, etc. Each unit of the existing variable frequency water supply control system is relatively independent and lacks redundancy design. Especially for the control power supply and the controller unit, if any one unit fails, the system will shut down; there is only one main pipe pressure transmitter configured, and the system cannot achieve constant pressure water supply after a failure; the failure of the control power supply will also cause the human-machine interaction power supply, the instrument and meter unit, the controller unit, etc. to fail to operate normally. Summary of the Invention

[0005] In view of the above problems, the main object of the present invention is to provide a variable frequency control system based on full redundancy design in which any unit failure or disconnection will not affect the automatic water supply and monitoring display of the system.

[0006] The present invention solves the above technical problems through the following technical solutions: A variable frequency control system based on full redundancy design, the variable frequency control system based on full redundancy design includes: a power distribution unit, a human-machine interaction unit, multiple groups of variable frequency controller units, and multiple groups of instrument and meter units.

[0007] The power distribution unit is connected to the human-machine interaction unit, multiple groups of variable frequency controller units, and multiple groups of instrument and meter units by electrical connection; the power distribution unit is responsible for the on-off switching and electrical protection of the human-machine interaction unit, multiple groups of variable frequency controller units, and multiple groups of instrument and meter units.

[0008] One group of the multiple groups of variable frequency controller units and one group of the multiple groups of instrument and meter units are matched, and after matching, they are connected to the human-machine interaction unit in a parallel connection manner.

[0009] In a specific embodiment of the present invention, the human-machine interaction unit includes: a touch screen, an Internet of Things gateway, and a CAN gateway; the CAN gateway is connected to multiple groups of variable frequency controller units, and the Internet of Things gateway is connected to an external intelligent water service platform.

[0010] Monitor the operating status and data of multiple groups of variable frequency controller units through the CAN gateway, and realize data interconnection and interoperability between the variable frequency water supply system and the intelligent water service platform through the Internet of Things gateway.

[0011] In a specific embodiment of the present invention, each of the multiple groups of variable frequency controller units includes: an inverter board, a PLC board, and a monitor board; the inverter board is responsible for driving speed regulation and electrical protection of the motor; the PLC board is responsible for collecting control signals and sensor signals, logical control of the water supply system and data operation, and at the same time supports STEP7-Micro / WIN SMART programming, PPI, profinet, and Modbus communication protocols; the monitor board displays the operating data and status of the inverter and the water supply system, and at the same time sets and modifies the parameters of the inverter and the water supply system.

[0012] In a specific embodiment of the present invention, each of the multiple groups of instrument and meter units includes: 1 water tank level transmitter, 1 inlet pressure transmitter, and 2 outlet pressure transmitters. The outlet pressure transmitters are respectively connected to the standby 1# variable frequency controller and 2# variable frequency controller.

[0013] In a specific embodiment of the present invention, the 1# variable frequency controller and the 2# variable frequency controller are connected with a CAN bus for sharing sensing data.

[0014] The positive and progressive effects of the present invention are as follows: The variable frequency control system based on full redundancy design provided by the present invention has the following advantages compared with common technologies: The variable frequency water supply system of the present invention is based on full redundancy design of the variable frequency controller power supply, human-machine interaction unit, control power supply unit, outlet pressure transmitter unit, etc. Any failure or disconnection of any unit will not affect the automatic water supply and monitoring display of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] The following provides a preferred embodiment of the present invention in conjunction with the drawings to illustrate the technical solution of the present invention in detail.

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention, as Figure 1Shown as follows: A variable frequency control system based on full redundancy design proposed by the present invention. The variable frequency control system based on full redundancy design includes: a power distribution unit, a human-machine interaction unit, multiple groups of variable frequency controller units, and multiple groups of instrument and meter units.

[0018] The power distribution unit is connected to the human-machine interaction unit, multiple groups of variable frequency controller units, and multiple groups of instrument and meter units through electrical connection; the power distribution unit is responsible for the on-off switching and electrical protection of the human-machine interaction unit, multiple groups of variable frequency controller units, and multiple groups of instrument and meter units; one of the multiple groups of variable frequency controller units is paired with one of the multiple groups of instrument and meter units, and after pairing, they are connected to the human-machine interaction unit in a parallel connection manner.

[0019] This system 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. Any unit failure or disconnection will not affect the automatic water supply and monitoring display of the system.

[0020] The human-machine interaction unit includes: a touch screen, an Internet of Things gateway, and a CAN gateway; the CAN gateway is connected to multiple groups of variable frequency controller units, and the Internet of Things gateway is connected to an external intelligent water service platform. Monitor the operating status and data of multiple groups of variable frequency controller units through the CAN gateway, and realize data interconnection and interoperability between the variable frequency water supply system and the intelligent water service platform through the Internet of Things gateway.

[0021] Each group of the multiple groups of variable frequency controller units includes: an inverter board, a PLC board, and a monitor board; the inverter 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 logical control and data operation of the water supply system, and at the same time supports STEP7-Micro / WIN SMART programming, PPI, profinet, and Modbus communication protocols; the monitor board displays the operating data and status of the inverter and the water supply system, and at the same time sets and modifies the parameters of the inverter and the water supply system.

[0022] Each group of the multiple groups of instrument and meter units includes: 1 water tank level transmitter, 1 inlet pressure transmitter, and 2 outlet pressure transmitters. The outlet pressure transmitters are respectively connected to the standby 1# variable frequency controller and 2# variable frequency controller.

[0023] The following is a specific implementation example:

[0024] Each variable frequency controller in the control system of the present invention is an independent variable frequency water supply control system.

[0025] (1), Engineers can download the PLC control program to each variable frequency controller through the gateway using a PC.

[0026] (2) The control signal and the sensor signal are directly connected to the 1# frequency converter controller and the 2# frequency converter controller;

[0027] (3) By default, the 1# frequency converter controller is the main control system, and the 2# frequency converter controller is the standby control system. When the 1# frequency converter controller loses power or drops the line, the system automatically switches the 2# frequency converter controller as the main control system, and the frequency conversion control system realizes hot standby redundancy, making the system safe and reliable;

[0028] (4) The main control PLC board of the frequency converter controller controls the start and stop and debugging of each frequency converter controller through the CAN bus with the control logic and operation results, realizing variable frequency water supply;

[0029] (5) Two outlet pressure transmitters are respectively connected to the 1# frequency converter controller and the 2# frequency converter controller. Each frequency converter controller can share sensor data through the CAN bus. When one of the pressure transmitters breaks or fails, the system will automatically use the other pressure transmitter as the feedback value to realize variable frequency constant pressure water supply;

[0030] (6) The switching power supply can only supply power to the human-machine interaction unit. Even if the switching power supply fails or the human-machine unit fails, the monitoring board in the frequency converter controller can still monitor and control the variable frequency water supply status and data;

[0031] In summary, the system is a variable frequency water supply system based on the full redundancy design of the frequency converter controller power supply, human-machine interaction unit, control power supply unit, outlet pressure transmitter unit, etc. Any failure or disconnection of any unit will not affect the automatic water supply and monitoring display of the system.

[0032] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A variable frequency control system based on full redundancy design, characterized in that: The frequency conversion control system based on full redundancy design includes: a power distribution unit, a human-machine interaction unit, multiple groups of frequency conversion controller units, and multiple groups of instrumentation units. The power distribution unit is connected to the human-machine interaction unit, multiple frequency conversion controller units, and multiple instrumentation units by means of electrical connection; the power distribution unit is responsible for on-off switching and electrical protection of the human-machine interaction unit, multiple frequency conversion controller units, and multiple instrumentation units; One of the multiple groups of frequency conversion controller units is matched with one of the multiple groups of instrument units, and after matching, they are connected to the human-machine interaction unit in a parallel connection manner.

2. The variable frequency water supply control system based on full redundancy design according to claim 1 is characterized in that: The human-machine interaction unit includes: touch screen, IoT gateway, and CAN gateway; the CAN gateway is connected to multiple sets of frequency conversion controller units, and the IoT gateway is connected to the external smart water platform; The operating status and data of multiple groups of frequency conversion controller units are monitored through the CAN gateway, and the data interconnection between the frequency conversion water supply system and the smart water platform is achieved through the Internet of Things gateway.

3. The variable frequency water supply control system based on full redundant design according to claim 1 is characterized in that: Each of the multiple frequency conversion controller units includes: frequency converter board, PLC board, and 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 collection of control signals and sensor signals, the logical 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 water supply system, and sets and modifies the parameters of the frequency converter and water supply system.

4. The variable frequency water supply control system based on full redundancy design according to claim 1 is characterized in that: Each of the multiple groups of instrumentation units includes: 1 water tank level transmitter, 1 water inlet pressure transmitter, and 2 water outlet pressure transmitters. The outlet pressure transmitters are respectively connected to the 1# frequency conversion controller and the 2# frequency conversion controller which serve as backup for each other.

5. The variable frequency water supply control system based on full redundancy design according to claim 4 is characterized in that: The 1# frequency conversion controller and the 2# frequency conversion controller are connected with a CAN bus for realizing sensor data sharing.

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