Electrical system into the DCS Digital Simulation
. Electrical systems and thermal simulation automation system needs of the joint began to appear. Electrical system and thermal system requirements compared to the control and operation of the process has many different points, the main electrical characteristics, such as automatic equipment requirements to protect electrical equipment, high reliability, fast action; electrical equipment Operating mechanism Complex, low frequency operation, require the electrical system into the DCS unit control, the control system has high reliability, in addition to starting, stopping and running of normal operation, the particular requirement to achieve real-time display abnormal operation and under accident conditions various data and status, and provide operational guidance and emergency measures to guarantee the safety of electrical system control in the most reasonable working condition. Electrical characteristics of the system so that over the years the power system simulation using specialized software, and plant thermal control system simulation is carried out separately. As computer technology developed open, general-purpose simulation software using different types of process simulation has become possible, such as MATLAB power system simulation has already been emphasized [1]. [1] in 1997 introduced the Real Time Digital Simulation of electromagnetic transient analysis software package PSCAD / EMTDC to MATLAB conversion, a universal open visual technology.
MATLAB matrix operations with its powerful capabilities and simple graphics, visual simulation and rich algorithm toolbox, has become a research and development engineers a powerful tool [2], as has been widely used in various different types of power plant thermal control system. Reference [3] introduced the MATLAB visualization for industrial process simulation technology. However, for power systems engineering and technical personnel, how in accordance with the engineering requirements, accurate and fast circuit and more complex electrical system to customize the simulation study, the conventional simulation tools did not match, because if all sectors of the simplified transfer function expressed in many important details were ignored; if provided with MATLAB Simulink in the basic module (such as switches and triggers) to construct the model, then it is time consuming, although they could be achieved using the PSPICE simulation of electronic circuits, but the PSPICE mainly applicable to the field of microelectronics, power systems is difficult and complex algorithms required for the design and advanced control theory. So far a large number of electrical system still uses proprietary simulation package [4]. This will combine MATLAB in Power System Blockset (PowerSystemBlockset), of a power system simulation using MATLAB analysis and design methods. Using MATLAB and FOR-TRAN and other high-level language interface, you can also inherit many years experience in power system simulation.
1 Introduction Power System Blockset MATLAB version 5.2 above the Power System Blockset Powerlib. Power System Blockset for Simulink as the operating environment, covering circuits, power electronics, electric drive and power systems, electrical disciplines, the basic components and systems commonly used in the simulation model, not only of a power system in time domain and frequency domain calculation of simulation, such as computing power system subjected to disturbance or parameter changes with time when the electrical parameters of the law, and can be widely applied High pressure HVDC, FACTS controller design, power system harmonic analysis and simulation of power electronic field calculation.
After running Simulink, open Blocksets & Tool-boxes, will be able to call up Power System Blockset. You can also MATLAB's command window, type the Powerlib directly transferred out. Power System Blockset Powerlib shown in Figure 1 by the sub-module library composed of 6.
(1) Power supply Module library: including DC voltage source, AC voltage source, AC current source, controlled voltage source and the controllable current source and so on.
(2) basic components module library: including series RCL load / slip, parallel RCL load / slip, linear Transformer , Saturated transformers, Transformer , Circuit breakers, N with distributed parameter line, single-phase type lumped parameter transmission lines and electrical appliances such as surge release.
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