The biggest characteristic of DCS in control is that it relies on the flexible configuration of various control and arithmetic modules, which can realize diversified control strategies to meet the needs of different situations, making the propositions in the unit combination instrument quite cumbersome and complicated to become simple. With the high flexibility and high efficiency requirements put forward by the enterprise, the control scheme based on the classical control theory can no longer be adapted. After the advanced control strategy represented by multivariable predictive control is put forward and successfully applied, the advanced process control is affected by the process. General concern in the industry. It should be emphasized that the extensive application of various advanced control and optimization technologies is the most effective, direct and most valuable development direction for mining and improving the overall performance of DCS.
In the actual process control system, the system based on PID control technology accounts for more than 80%. The advantages and disadvantages of PID circuit play a decisive role in achieving stable, efficient and high-quality operation of the device. All DCS manufacturers use this as a powerful force to seize the market. Competitive weights were developed to develop their own PID self-tuning software. In addition, according to the control function of DCS, based on the basic PID algorithm, various improved algorithms can be developed to meet various needs of the actual industrial control site, such as PID control with dead zone, PID control with integral separation, differential first PID control, incompletely differentiated PID control, PID control with logic selection function, and so on.
Different from the traditional PID control, the predictive control algorithm based on the non-parametric model predicts the future output state of the system by predicting the model, and uses the rolling optimization strategy to calculate the output of the current controller. Depending on the implementation, there are various algorithms, such as internal model control, model algorithm control, dynamic matrix control, and the like. At present, practical predictive control algorithms have been introduced into DCS. For example, IDCOM control algorithm software packages have been widely used in practical industrial processes such as hydrocracking, catalytic cracking, atmospheric distillation, and naphtha catalytic reforming. In addition, there are Honeywell's HPC, Yokogawa's PREDICTROL, Yamatake Honeywell's Kalman filter-based predictive controller developed in the TDC-3000LCN system. This kind of predictive controller does not simply put the Kalman filter before the previous predictive control for noise filtering, but uses the Kalman filter as the optimal state estimator, and performs optimal state estimation and noise filtering.
There are many advanced control algorithms. At present, many domestic and foreign control software companies and DCS manufacturers are competing to develop advanced control and optimization control engineering software packages, hoping to embed advanced control and optimization control strategies in the configuration software.
Dcs control system featuresThe HC900DCS control system is a DCS control system based on the evolution of loop control. The control of analog quantity is its unique advantage, and the level accuracy is 0.1. The programming method is not a statement or a ladder diagram, but in the form of a function module. A simple function block only processes a single task. A complex function block such as a PID function block with an input and output function block has all the main functions of the digital controller. . Programming is relatively simple and reliable, reducing the amount of programming errors. The communication mode is Ethernet communication. During the operation of the whole device, the monitoring program can be opened to monitor the running status of the DCS program, and the internal program of the DCS as the lower computer can be modified without interrupting the process operation of the device.
On-site installation and commissioning is very easy. All internal function block inputs
The output and operation are analog quantities calculated by floating point. The control of the temperature loop and the pressure loop is very accurate and stable, and the digital processing speed is slower than that of the PLC. The HC900DCS control system is ideal for control systems for industrial furnaces that do not require sequential motion control for temperature control. The communication protocol between the HC900DCS control system and the host computer is completely open, so it can be applied to a variety of industrial configuration software.
Control system compositionThe HC900DCS control system host computer uses a DELL computer with an Ethernet card. The lower position machine is HoneywellHC900, and another M2I touch screen is used as a backup. Once there is a problem with the upper computer, it can be operated on the touch screen M2I without affecting production. See Figure 1
2.1 computer system
It consists of the picture of the furnace body, process curve, real-time curve, historical data, historical data query, workpiece record, workpiece data query, parameter correction, PID parameter setting and so on. The entire monitoring system based on Kingview software has a friendly interface, which can realize dynamic display system flow, process parameter setting, real-time monitoring of process control loop, historical trend curve and history query, and query and print data management. Features. 2.2
HC900DCS system HC900CPU: 900C51, according to the number of input and output points with DI: 900G01, DO: 900H02, AI: 900A01, AO: 900B01, with communication module, power module, chassis and some 250Ω standard resistors.
2.2 touch screen
South Korea M2I company 10.5" touch screen, RS232 or RS485 communication, TOP-Designer programming software.
3 control system performanceThe entire control system features full-featured, reliable performance, simple operation, and easy to learn.
3.1 computer control system
The configuration control software of Beijing Yakong Control Co., Ltd. is a general-purpose configuration software commonly used in China.
Stronger and more reliable. The kiln control software designed by the author on its platform is designed for factory operators and has the characteristics of friendly interface, easy to understand and easy to learn. As the management of the upper computer, not only has the function of data management record, all operation control can be performed on the control screen of the upper computer, and also has alarm protection function.
3.2HC900DCS control system
The control precision is high, the reliability is high, and the function of leaving the upper computer to operate independently is provided. Once the equipment is put into operation, the DCS control system can also complete the entire process according to the process curve requirements after the computer is turned off.
3.3 touch screen
As a backup device of the computer, it has the operation function of the host computer, and can start the HC900DCS control system when the computer is faulty.
4 conclusionThe whole control system is advanced and reliable, and the temperature and pressure control effect of the whole equipment is very good. The temperature field test is tested by the heat treatment temperature field of the field personnel of France Famatong Company. The heat treatment of the product reaches the heat treatment of nuclear power products of Westinghouse and France Famatong. The standard provides a reliable platform for heat treatment process control of nuclear power products in China.
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