Currently widely used hydraulic turbine governor, taking PLC as the core. Digital valve PCC development of Tianjin keyin auto-conrol Equipment Co., Ltd. Programmable Intelligent Governor with a new control concept, using PCC as the control core, the automation control of the whole process, the digital valve configuration composed of electromagnetic valve and cartridge valve electro-hydraulic converter instead of traditional and main valve.
Controller is a core component of the governor, governor controller completed signal acquisition, data processing, control law implementation, operation state switching, control output and other additional functions. Therefore, it is important to choose the new governor controller development. At present, a lot of controller on the market, such as MCU, PLC, PCC, but because the governor is a device on the industrial field, very high reliability requirements. An important principle of selecting controller is, to choose suitable for industrial use and strong anti-interference ability, high reliability, large choice, convenient operation and maintenance of the controller. We after in-depth research, comparative analysis of various controller, combined with the particularity of the hydraulic turbine governor, Austria B & R ( B&R ), PCC is able to meet the above principles of the most suitable controller, the choice of PCC as the control core of PCC intelligent digital valve governor.
PCC represents a new control concept, it not only has a programmable logic controller ( PLC ) of the standard control functions ( high reliability, easy expansion ), and has the industrial computer ( IPC ) system function ( operation ability, good real-time, convenient programming etc.). It can easily handle switch, analog, to loop controller. And can use high-level language programming, with the analysis of mainframe computing power. The hardware has a pluggable module structure is unique and novel, can make the system be flexible extension and combination. The software also has module structure, system expansion only in the original basis superposition using the software module. PCC CPU is the 32, high efficiency, high speed intelligent processor TPU, TPU function can make the system achieve microsecond response time, while the CPU without any loading. User memory capacity. Has the ability and the field bus technology comprehensive support good EMC, reflected the development direction in the field of industrial control.
Digital valve PCC Intelligent Governor including monotonic integer and double adjustment type, in this paper, and main characteristics of double integral regulator function.
The main characteristics of PCC intelligent digital valve governor
( 1 ) new control concepts. The use of a new generation of programmable computer controller --PCC is different from the conventional PLC, for the control process, using a high-level language, analyzing operation capability is strong, in the same CPU can run different applications at the same time. When the program is run scan only part of the program, the efficiency is very high.
( 2 ) PCC, reliability is high. From input to output, from the frequency measurement to control the pulse of PCC are achieved. The mean time to failure of PCC MTBF up to 500000 hours, or 57 years.
( 3 ) the advantages of multiple tasks. With traditional PLC, parallel processing is accomplished by scanning procedures. But in fact multi-task parallel processing is a logical expression, more simple and direct method is to use multiple tasks. PCC just to meet this demand, when a task is waiting, still can continue to perform other tasks. PCC the whole control is divided into a number of different priority level ( Task Class ). The task of higher priority level, the scan cycle is short, the priority is lower, the scan cycle is long. The timeliness requirements of high program on the high-speed task layer, the general logic handler in a common task layer, so that can improve the performance of control system.
( 4 ) intelligent speed regulator. Adaptive variable structure, variable parameters of parallel PID regulation, the conventional PID control algorithm of [2] is improved. Automatic recognition of the nature of the grid, and automatically adapt to various special operation station, such as the isolated network operation, and / or by a large network of small power grid solution as the mutation load and other special circumstances, can ensure stable operation of units. Humanized design, has the very strong self diagnosis, error prevention, error correction and fault tolerance. When a fault occurs, the automatic pop-up screen display and automatic fault diagnosis, fault causes and treatment measures.
( 5 ) the use of PCC high-speed counter module ( HSC ) frequency measurement. PCC count frequency up to 6.3MHz, with a high frequency measurement accuracy and reliability, so that the reliability of input channels governor - frequency measurement link with the fundamental guarantee.
( 6 ) digital associated way, and can be modified Cam Curve and the modified data to memory, according to the actual conditions of power plant operation according to the optimal curve, blade servo system with high accuracy.
( 7 ) PCC large memory, provides resources for the intelligent speed regulator. User memory: 1.5 MB FLASH PROM.
( 8 ) electromagnetic valve used digital valve as the electro-hydraulic conversion elements. Solve the conventional problem of hydraulic converter oil card governor electricity, the power station can be completely reliable automatic operation.
( 9 ) has the function of fault locking. As the only digital valve on / off two states, and the digital valve with conical valve sealing to ensure no leakage in 31.5MPa, so, the digital valve and has the function of hydraulic lock, so when the measuring frequency signal disappears and power-off condition, has the function of fault locking.
( 10 ) no lever structure. The series uses a digital speed governor valve hydraulic servo system, automatic electrical feedback, manually without feedback, the cancellation of the lever, to eliminate the cause of the dead as leverage, to improve the accuracy of the speed control system, and no pipe, simple structure, beautiful.
( 11 ) the friendly man-machine interface. Used as a touch screen interface, beautiful and vivid picture, full Chinese display, easy to operate, can display a lot of information. With screen protection function, to extend the life of the touch screen.
( 12 ) maintenance is simple and convenient debugging. Due to high integration and high reliability of PCC, no special requirements are too high for the operation and maintenance personnel, debugging just to set the digital, not too many adjustable components such as potentiometers. Dedecms
The main function of the digital valve PCC Intelligent Governor
PCC programmable intelligent digital valve governor with automatic, manual, manual three kinds of mode of operation, and can switch unconditionally without disturbance. Has many functions, practical very strong intelligence, besides the conventional function has the following main functions.
( 1 ) when no-load operation, the system can automatically track the frequency, to achieve fast synchronization.
( 2 ) with a frequency adjustment, opening regulation, power regulation three modes, and can be adjusted to achieve disturbance-free switching between modes. Power control mode, can accept the PC control instruction, to realize the automatic control function generator ( AGC ).
( 3 ) with strong self-diagnosis, error prevention, error correction and fault tolerance, and may be the fault information is displayed on the screen, or send out alarm signal. With the online diagnosis and fault-tolerant function: analog / digital converter fault input channel and the feedback channel fault; fault; hydraulic control system; the program is in error and clock failure; emergency shutdown circuit fault; operation error; frequency measurement circuit fault; fault.
( 4 ) and PC communication function, the control PC to accept an order, send the information to the host computer.
( 5 ) off on Intelligent control.
( 6 ) auxiliary test function. Through the touch screen can be very convenient for the static characteristics, no-load disturbance and load swing test.
( 7 ) with a water level regulating function.
( 8 ) wave control, in order to avoid when load rejection occurs on the downstream water level wave.
( 9 ) multilevel password protection function. A password level, decided to exercise the right size system. The operator can only observe the display and routine operation, maintenance personnel or management personnel can adjust parameters to be modified.
( 10 ) with line shutdown, and by the standard cartridge valve, simple structure, reliable action.
Digital valve PCC Intelligent Governor
Structure diagram of PCC intelligent digital valve governor as shown in figure 1.
According to the requirements of users can adopt electromechanical combined cabinet type also can use electrical cabinet type. The layout of the structure is simple and reasonable, humanized design, easy maintenance, convenient operation. Governor on the touch screen, meter, button, installed in the appropriate cabinet instrument panel, easy observation and symmetrically arranged, all the instrumentation and control devices, the appearance of coordination.
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