CN207819558U - A kind of low-tension unit intelligent controller - Google Patents

Abstract

The utility model discloses an intelligent controller for a low-voltage unit, which is characterized in that it includes a CPU plug-in, a functional plug-in and a bus backboard, the functional plug-in includes a synchronous plug-in, a protection plug-in and an excitation plug-in, the CPU plug-in, the synchronous plug-in The plug-in, the protection plug-in and the excitation plug-in are respectively connected to the bus backplane, and the synchronization plug-in, the protection plug-in and the excitation plug-in all include a DSP operation processing unit. The synchronous plug-in, protection plug-in, and excitation plug-in can operate independently, and can complete their core functions even when the CPU fails, which improves the overall reliability of the device. At the same time, it is integrated in the controller in the form of a plug-in, which is beneficial to device maintenance.

Description

A kind of intelligent controller of low pressure unit

technical field

The utility model relates to an intelligent controller of a low-voltage unit, which belongs to the technical field of low-voltage unit control systems.

Background technique

The current low-voltage unit control system provided by the market is not flexible enough in the configuration of the automatic control process of the unit, and is not convenient enough for the user's operation and maintenance.

The low-voltage unit integrated control system is the core of the low-voltage unit power station automation system. The control objects cover the main primary and secondary system equipment of the power station, including monitoring, protection, excitation, circuit breakers, governors and other auxiliary control equipment. The intelligent controller of the low-voltage unit is the core equipment of the integrated control system of the low-voltage unit. It has multiple functions such as data collection, processing, communication, and monitoring. The automatic control process of the unit is also realized through the intelligent controller.

There are two existing schemes: one is a system-integrated hydropower station monitoring system similar to the conventional one with PLC as the core, supplemented by several discrete functional devices: protection device, synchronization device and excitation device, programmed through PLC The method realizes the automatic control of the unit, and its control process is designed and written by the equipment commissioning personnel according to the requirements of the design institute, user needs and actual conditions on site, and can be modified on site; the other is an intelligent controller with an integrated design, using a The controller realizes all the functions required for monitoring, and a set of control procedures is pre-written and solidified in the CPU of the controller. The user connects the required signals and circuits according to the design requirements, and the controller can control the monitoring according to the preset procedures. The unit takes control.

The above-mentioned first scheme can formulate different control procedures according to different actual conditions of the site, and when the site conditions change, the PLC program can also be modified to adapt to the changes. Most of the hydropower stations using low-voltage units are rural small hydropower stations. Because the structure is similar to the traditional integrated monitoring system, the secondary circuit is complex and there are many separate devices, which is not conducive to maintenance.

In the above-mentioned second solution, due to the completely integrated design, a problem in one link of the device will affect the normal operation of the entire device, and the reliability is not good.

Utility model content

The technical problem to be solved by the utility model is to overcome the defects of the prior art and provide an intelligent controller for the low-voltage unit, which adopts an integrated structural design, and the internal functional plug-ins are independent of each other, ensuring that the control system of the low-voltage unit operates under different conditions It is flexible at the same time without reducing the security requirements for the control process.

In order to achieve the above purpose, the utility model provides an intelligent controller for a low-voltage unit, including a CPU plug-in, a functional plug-in and a bus backplane, the functional plug-in includes a synchronization plug-in, a protection plug-in The plug-in, the protection plug-in and the excitation plug-in are respectively connected to the bus backplane, and the synchronization plug-in, the protection plug-in and the excitation plug-in all include a DSP operation processing unit.

Preferably, the synchronous plug-in includes a clock circuit, a reset circuit, a hardware open loop, a DSP operation processing unit, a CAN communication unit, and an AC acquisition interface. The clock circuit, the reset circuit, the hardware open loop, the The CAN communication unit and the AC acquisition interface are respectively electrically connected to the DSP operation processing unit, and the CAN communication unit and the AC acquisition interface are respectively electrically connected to the bus backplane.

Preferably, the protection plug-in includes a hardware open-in circuit, a hardware open-out circuit, a DSP operation processing unit, a CAN communication unit and an AC A/D acquisition unit, the hardware open-in circuit, the hardware open-out circuit, the The CAN communication unit and the AC A/D acquisition unit are respectively electrically connected to the DSP operation processing unit, and the CAN communication unit and the AC A/D acquisition unit are respectively electrically connected to the bus backplane.

Preferably, the excitation plug-in includes a hardware open-in loop, a hardware open-out loop, a CAN communication unit, an AC A/D acquisition unit and a DSP operation processing unit, the hardware open-in loop, the hardware open-out loop, the The CAN communication unit and the AC A/D acquisition unit are respectively connected to the DSP operation processing unit; the DSP operation processing unit includes a CPLD complex programmable logic device, and the CAN communication unit and the AC A/D acquisition unit are respectively electrically connected to the bus backplane.

Preferably, the synchronization plug-in, the protection plug-in and the excitation plug-in all include FLASH for storing parameters and fixed values.

Preferably, a host computer is included, the CPU plug-in is connected to the host computer, and the CPU plug-in includes an R register.

Preferably, it includes an I/O plug-in, and the I/O plug-in includes an input plug-in, an output plug-in, a mold input and temperature plug-in, an exchange plug-in 1, an exchange plug-in 2, the input plug-in, the output plug-in, The mold input and temperature plug-ins, the AC plug-in 1 and the AC plug-in 2 are respectively electrically connected to the bus backplane.

Preferably, a power plug is included, and the power plug is electrically connected to the bus backplane.

Preferably, a liquid crystal panel is included, and the liquid crystal panel is electrically connected to the bus backplane.

Preferably, the power plug-in is electrically connected to the bus backplane.

The beneficial effects achieved by the utility model:

1. Modify the process parameter value directly through the man-machine interface, so it does not require the user to have a high level of professional technology. It is also very simple to modify under the guidance of technicians when necessary, and there is no need for the manufacturer's technicians to go to the site for maintenance.

2. If the AC volumes that need to be collected for synchronization, protection, and excitation overlap, they all share the same hardware collection channel, which saves hardware cost and space.

3. The CPU has no power-off retention, fully utilizes the storage function of the MMI, simplifies the hardware structure, and saves hardware costs.

4. Process parameters can be issued by the host computer, and automatically update the parameters stored in the device, making remote modification of the process easier and more adaptable to site conditions.

5. The synchronous plug-in, protection plug-in, and excitation plug-in can operate independently, and can complete their core functions even when the CPU fails, which improves the overall reliability of the device. At the same time, it is integrated in the controller in the form of a plug-in, which is beneficial to the device maintain.

6. Multiple functional plug-ins that need to collect communication data share the hardware collection channel, which simplifies the system structure and saves hardware costs.

7. All the state quantities that need to be monitored during unit operation, as well as synchronization, protection, and excitation data can be displayed through the same man-machine interface, which prevents users from viewing different measurement and control device data in different monitoring areas on the panel, and is more convenient for daily operation and maintenance. .

Description of drawings

Fig. 1 is a structural diagram of the utility model;

Fig. 2 is a schematic diagram of the utility model;

Fig. 3 is a hardware connection diagram of the utility model.

Detailed ways

The utility model will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the utility model more clearly, but not to limit the protection scope of the utility model.

An intelligent controller for a low-voltage unit, including a CPU plug-in, a function plug-in and a bus backplane, the function plug-in includes a synchronous plug-in, a protection plug-in and an excitation plug-in, the CPU plug-in, the synchronous plug-in, the protection plug-in and the The excitation plug-ins are respectively connected to the bus backplane, and the synchronization plug-ins, the protection plug-ins and the excitation plug-ins all include a DSP operation processing unit.

Further, the synchronous plug-in includes a clock circuit, a reset circuit, a hardware open loop, a DSP operation processing unit, a CAN communication unit, and an AC acquisition interface. The clock circuit, the reset circuit, the hardware open loop, the The CAN communication unit and the AC acquisition interface are respectively electrically connected to the DSP operation processing unit, and the CAN communication unit and the AC acquisition interface are respectively electrically connected to the bus backplane.

Further, the protection plug-in includes a hardware open-in circuit, a hardware open-out circuit, a DSP operation processing unit, a CAN communication unit and an AC A/D acquisition unit, the hardware open-in circuit, the hardware open-out circuit, the The CAN communication unit and the AC A/D acquisition unit are respectively electrically connected to the DSP operation processing unit, and the CAN communication unit and the AC A/D acquisition unit are respectively electrically connected to the bus backplane.

Further, the excitation plug-in includes a hardware open-in loop, a hardware open-out loop, a CAN communication unit, an AC A/D acquisition unit, and a DSP operation processing unit, the hardware open-in loop, the hardware open-out loop, the The CAN communication unit and the AC A/D acquisition unit are respectively connected to the DSP operation processing unit; the DSP operation processing unit includes a CPLD complex programmable logic device, and the CAN communication unit and the AC A/D acquisition unit are respectively electrically connected to the bus backplane.

Further, a host computer is included, and the CPU plug-in is connected to the host computer.

Further, a host computer is included, the CPU plug-in is connected to the host computer, and the CPU plug-in includes an R register.

Further, it includes an I/O plug-in, and the I/O plug-in includes an input plug-in, an output plug-in, a mold input and temperature plug-in, an exchange plug-in 1, and an exchange plug-in 2, the input plug-in, the output plug-in, The mold input and temperature plug-ins, the AC plug-in 1 and the AC plug-in 2 are respectively electrically connected to the bus backplane.

Further, a power plug is included, and the power plug is electrically connected to the bus backplane.

Further, a liquid crystal panel is included, and the liquid crystal panel is electrically connected to the bus backplane.

Further, the power plug-in is electrically connected to the bus backplane.

An intelligent controller of a low-voltage unit, as shown in Figure 1, the device includes the following parts:

LCD screen panel: including LCD screen, buttons, ARM processor and required hardware circuits.

Bus backplane: Each plug-in is connected to the bus backplane through the back plug, and interacts through the bus. There is also an LCD panel interface that can supply power to the LCD screen, and the CPU communicates with the LCD screen through this interface.

Power plug-in: supply power to all plug-ins and LCD screen;

CPU plug-in: As the core of the device, it interacts with other plug-ins and LCD screens, has data monitoring, processing, and communication functions, can execute control procedures, and provides a serial port for external communication and a debugging serial port;

I/O plug-in: including input plug-in, module input plug-in, temperature plug-in, AC input plug-in and switch signal output plug-in;

Functional plug-ins: including synchronous plug-ins, protection plug-ins, and excitation function plug-ins, each of which completes the corresponding function.

All plug-ins are connected to each other through the bus backplane, the power supply module supplies power to each module through the bus backplane, and the CPU completes data interaction with each I/O plug-in and function plug-in through the bus backplane. There is also an LCD screen interface on the backplane of the bus, through which the CPU communicates with the LCD screen, provides data display and accepts instructions issued by the LCD screen. In addition, the CPU is also equipped with a serial port for external communication, which is used to connect the debugging software and the host computer.

The CPU plug-in structure of the device is simple, and there is no power-off hold function, input, output, mold input, temperature channel parameters, unit rated parameters, temperature alarm and trip limit, analog range, PT and CT ratio, power Parameters that require power-down retention, such as adjustment parameters, are not directly stored in the CPU, but are stored in the FLASH of the MMI board of the LCD screen. Every time the device is powered on, the MMI board will automatically run an initialization program, and automatically send the unit parameters stored in it to the CPU. After receiving the parameters, the CPU will load the parameters to the corresponding I/O plug-in, and then start normal operation.

Synchronization, protection, and excitation plug-ins are all equipped with independent DSP and FLASH, and are equipped with their own required input and output circuits. These three obtain AC sampling data from the public AC plug-in acquisition channel through the CAN network, and use them to realize the calculations required for their respective functions. They can also communicate with the CPU plug-in through the CAN bus to send their respective fixed value parameters, channel coefficients, Exchange measured values, and receive control commands from the CPU and fixed value parameters and channel coefficients forwarded from the MMI board. Synchronization, protection, and excitation plug-ins can run independently of the CPU plug-in. Even if they cannot communicate with the CPU plug-in, as long as the parameter settings stored in each are not lost, they can complete their core tasks normally, and they can also input and output through their respective hardware. Channels receive simple commands.

The CPU provides a group of word type (16-bit) registers - R registers, part of which is specially used to store the parameters of the unit control process. The LCD screen can download process parameters to this storage area, and the host computer can also download process parameters to this area through an external serial port.

The process parameter values are generally stored in the memory of the man-machine interface. After the intelligent controller is powered on, the man-machine interface automatically downloads the process parameters to the CPU, and then the process parameters can be displayed and modified through a special page and downloaded. When the host computer downloads the process parameters to the CPU, it will write a specific register as 2 at the same time, as a sign that the host computer sends parameters. After the man-machine interface reads this flag, it will upload the process parameters stored in the CPU to the memory of the man-machine interface for updating and saving. After the update is successful, the register will be cleared.

A set of automatic start-up and shutdown processes are preset in the CPU with flowchart programming. The process frame is fixed and the order of steps cannot be disrupted. However, whether some steps are executed or not, the way of opening, the delay time, and the time limit are controlled by variables. . When the process executes to such steps, read the variables in the corresponding R registers to determine how the process steps are executed.

1) The overall framework of the unit process is fixed, but some of the steps are executed or not, the way of opening, the delay time, the time limit, etc. are controlled by reading variables from the register.

2) Use a special page to display the process parameters on the LCD screen for modification, and at the same time give the upper and lower limits of each parameter in the LCD screen program.

3) The process parameters can be downloaded to the CPU through the host computer, and the process parameter values stored in the MMI board can be automatically updated.

4) The synchronization plug-in, protection plug-in, and excitation plug-in are each equipped with a DSP and corresponding hardware circuit, and are all equipped with FLASH for storing parameters and fixed values. The three plug-ins are responsible for synchronization, protection, and excitation functions, and can communicate with the monitoring CPU to transmit data and receive instructions through the CAN bus, but their core functions can be realized independently without relying on the monitoring CPU.

5) If the AC volumes that need to be collected for synchronization, protection, and excitation overlap, they all share the same hardware acquisition channel, saving hardware cost and space. The three acquire data and process them separately without affecting each other.

6) The CPU plug-in obtains data from each I/O plug-in, synchronous plug-in, protection plug-in, and excitation plug-in through the CAN network, communicates with the LCD screen MMI board through the SPI interface, and displays the processed data on the LCD screen. The switch-in, switch-out, model input, temperature, AC quantity, synchronous measured value, fixed value, protection measured value, fixed value, channel coefficient, excitation measured value, fixed value, channel coefficient required for unit operation monitoring can all be passed through the same The LCD screen displays. Through the key operation on the LCD panel, not only can the unit control command be issued, but also the parameter setting of each I/O plug-in, synchronous plug-in, protection plug-in, and excitation plug-in can be modified, and the channel coefficient can be corrected without operating each plug-in separately. .

7) The CPU does not have a power-down hold storage area, open-in, open-out, mold-in, temperature channel parameters, unit rated parameters, temperature alarm and trip limit, analog range, PT and CT ratio, power adjustment Parameters, etc. are stored in the MMI board, and downloaded to the CPU when the device is powered on and initialized to ensure the normal operation of the CPU. These parameters can also be modified and downloaded to the CPU by operating the LCD screen with keys, and at the same time update the parameter values stored in the MMI board.

The above is only the preferred embodiment of the utility model, and it should be pointed out that for those of ordinary skill in the art, without departing from the technical principle of the utility model, some improvements and deformations can also be made. And deformation should also be regarded as the protection scope of the present utility model.

Claims (10)

1. a kind of low-tension unit intelligent controller, which is characterized in that including CPU card, feature card and bus backplane, the work( Can plug-in unit include same period plug-in unit, protective plug-in unit and excitation plug-in unit, the CPU card, the same period plug-in unit, the protective plug-in unit and The excitation plug-in unit respectively connects the bus backplane, and the same period plug-in unit, the protective plug-in unit and the excitation plug-in unit are equal Including DSP operation processing unit.

2. a kind of low-tension unit intelligent controller according to claim 1, which is characterized in that when the same period plug-in unit includes Clock circuit, reset circuit, hardware output circuit, DSP operation processing unit, CAN communication unit and exchange acquisition interface, when described Clock circuit, the reset circuit, the hardware output circuit, the CAN communication unit exchanges acquisition interface electricity respectively with described The DSP operation processing unit is connected, the CAN communication unit is electrically connected the bus back of the body with the acquisition interface that exchanges Plate.

3. a kind of low-tension unit intelligent controller according to claim 1, which is characterized in that the protective plug-in unit includes hard Part open entry loop, hardware output circuit, DSP operation processing unit, CAN communication unit and exchange A/D collecting units, the hardware Open entry loop, the hardware output circuit, the CAN communication unit is electrically connected DSP fortune with the A/D collecting units that exchange Processing unit is calculated, the CAN communication unit is electrically connected the bus backplane with A/D collecting units are exchanged.

4. a kind of low-tension unit intelligent controller according to claim 1, which is characterized in that the excitation plug-in unit includes hard Part open entry loop, hardware output circuit, CAN communication unit, exchange A/D collecting units and DSP operation processing unit, the hardware Open entry loop, the hardware output circuit, the CAN communication unit, the exchange A/D collecting units are separately connected the DSP Operation processing unit；The DSP operation processing unit includes CPLD Complex Programmable Logic Devices, the CAN communication unit, institute It states exchange A/D collecting units and is electrically connected the bus backplane.

5. a kind of low-tension unit intelligent controller according to claim 1, which is characterized in that the same period plug-in unit, described Protective plug-in unit and the excitation plug-in unit include the FLASH for storing parameter and definite value.

6. a kind of low-tension unit intelligent controller according to claim 1, which is characterized in that including host computer, the CPU Plug-in unit connects the host computer, and the CPU card includes R register.

7. a kind of low-tension unit intelligent controller according to claim 1, which is characterized in that including I/O plug-in units, the I/ O plug-in units include open into plug-in unit, output plug-in unit, mould enter with temperature plug-in unit, exchange plug-in unit 1, exchange plug-in unit 2, it is described to open into plug-in unit, institute State and output plug-in unit, the mould enter with temperature plug-in unit, it is described exchange plug-in unit 1, the exchange plug-in unit 2 is electrically connected the bus back of the body Plate.

8. a kind of low-tension unit intelligent controller according to claim 1, which is characterized in that described including power insert Power insert is electrically connected the bus backplane.

9. a kind of low-tension unit intelligent controller according to claim 1, which is characterized in that including liquid crystal display panel, institute It states liquid crystal display panel and is electrically connected the bus backplane.

10. a kind of low-tension unit intelligent controller according to claim 8, which is characterized in that the power insert is electrically connected Connect the bus backplane.