In the power industry, in order to improve the operational level and professional quality of thermal power unit operators, the use of simulation machines for training and assessment is an effective method. Most of today's units use the DCS control system, and the adjustment operation of the unit is mainly based on the operator station. The thermal power unit simulation model is divided into four parts: boiler equipment, turbine equipment, generator equipment and control system according to the production process. This paper discusses the simulation method of DCS control system using BLINK software.
The DCS simulation system reproduces the real DCS in a non-DCS computer system (pure software), does not involve the underlying hardware, and can run in a normal PC environment. Based on this hardware-independent feature, the simulation system can be applied to operator training and prior engineering commissioning.
There are two types of DCS control system simulation:One is simple simulation, that is, dynamic simulation of flowchart and program is realized by simulation software packages of various manufacturers.
Advantages: The program processing and interface operation are the same as the actual production, the required software and hardware are simple, and the one-time investment cost is low.
Disadvantages: Each loop does not have the same data source as the actual working condition. At most, it can be used as the input value according to the output value.
System composition: Each manufacturer is slightly different. Usually, the software only needs one simulation software package. Some manufacturers on the hardware only need one PC to simulate multiple controllers and operation stations. Some manufacturers need multiple PCs to simulate multiple. Controllers and operator stations.
Summary: It is only used by operators who are familiar with the operation methods of DCS systems, and the investment cost is low.
The other is process simulation, usually called Operator Training System (OTS). The biggest difference from the first simulation is the introduction of a factory production model that is identical to the actual operating conditions for the simulation system.
Advantages: According to the input of the same factory production model as the actual working conditions, the operator can make corresponding operations. The OTS can change the internal pressure data or temperature data according to the same operating characteristics as the actual plant operation, thus simulating the factory production equipment. The actual running of the overall environment.
Disadvantages: The investment cost is high, and the investment amount of an OTS system is usually millions or even higher. The simulation effect depends on the model software, and the debugging cycle is required in order to make the simulation effect as close as possible to the actual one. The system is complex.
System composition: Each manufacturer is slightly different, simply need a process device model software package (may be provided by non-DCS manufacturers), OPC interface software, DCS manufacturer's simulation software package, engineer software package, operation station software package, etc., hardware The basic components are five PCs, such as process equipment station, OPC station, simulation engineering station, simulation operation station, and simulation field control station.
Summary: Investment costs and technical risks are high, but it can be repeatedly trained on the daily working conditions of the factory and the emergency hazardous conditions. The configuration of the two simulations is the same as that of the actual engineering station, but the real project configuration is usually imported directly, without the need for separate simulation configuration.
Introduction to BLINK Simulation Support SoftwareBLINK is a simulation machine development support system that runs under WINDOWS2000/XP and integrates model development, debugging and operation. It can be applied to the simulation development of industrial processes or systems of thermal power units, power grids, substations, nuclear power, hydropower, petroleum, chemical, aerospace and vehicle ships of different capacities.
BLINK modeling thinkingBLINK uses a modular lap to establish a mathematical model of the system, namely modular modeling. BLINK believes that a system or production process is composed of many devices and functional units that are organically connected according to certain requirements. Equipment and functional units perform system-specific functions by exchanging physical quantities with each other. The system is large and complex, but the devices and functional units that make up the system are relatively simple. Thus, building a mathematical model of relatively simple equipment and functional units is much easier than building a mathematical model of a large and complex system.
A mathematical model of the characteristics and functions of an analog device or functional unit is called an algorithm and consists of inputs, outputs, coefficients, and computer program code. A module is a simulation entity generated by a reference algorithm, which corresponds to the device and functional unit of the simulated system. The input, output, and coefficients of the module are consistent with the algorithm being referenced. Inputs and outputs are the interfaces that connect the modules. According to the composition of the actual simulated system, the modules are connected to each other through input and output interfaces to form a simulation model.
BLINK training featuresSnapshot, rollback, replay
The instantaneous state of the model can be saved automatically or manually (snapshot), and the state of the snapshot save can be reloaded at any time to return the model to the state at the time of the snapshot (rollback). Use snapshots and rollbacks to repeat a phase of the training system process. After reverting to a previously saved snapshot state, the replay is initiated and the support system will automatically demonstrate the process experienced by the simulation system after the snapshot state. Find errors or shortcomings in the operation by replaying.
Fault, over control
One of the basic tasks of operator simulation training is to train the operator's fault judgment and processing capabilities through a large number of simulated faults. Fault setting is a must-have feature for training simulators. BLINK can set a single fault or set as a group fault. Override forces the interface output, meter indication, signal and model state to be different without changing the model output. It is used to train trainees to distinguish between equipment failures and instrument, sensor, and signal system failures.
Automatic lesson plan
According to the simulation training subject, the initial state, the set fault, and the over-control are listed in chronological order to form a lesson plan. After BLINK is loaded into the lesson plan, the simulation system will automatically be controlled by the lesson plan to reduce the labor of the simulator coach.
Automatic rating
Provide a scoring mechanism based on the process limit and digital alarm. The scoring rules are compiled as required, and BLINK automatically gives operational results within the specified time.
Characteristics of BLINK simulation support systema. It integrates model development, debugging and operation into one, and is a highly integrated simulation development and operation support system.
b. The requirements for the operating environment are not high, and the general microcomputer can be competent. The simulator system is low in cost.
c. Support online and offline two modeling methods. It is convenient for many people to develop at the same time.
d. The algorithm library is a standard Windows dynamic link library mode, which is convenient for the development, maintenance and expansion of algorithms.
e. Multi-threading technology is used to manage tasks such as model operation and communication. High operating efficiency and low machine load.
f. The communication configuration is flexible, and the number of computers in the system is unlimited.
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