Research on Synchronous Generator Excitation Regulator Based on PLC by Qin Chengzhi, Yang Junyou, Sun Rongzhen (School of Electrical Engineering, Shenyang University of Technology, Shenyang 110023, China) 224, dual channel structure, can realize automatic switching and tracking function. The system has constant voltage, constant excitation current and constant reactive power, which can be switched smoothly and arbitrarily. Finally, the simulation study of the excitation system is carried out. The results show that the stability of the system is greatly improved after the excitation system is added with the power system stabilizer. With the development of power systems, the capacity of single units is constantly increasing, and there are many long-distance transmission lines, which puts higher requirements on the stability of power system operation and the reliability of unit operation. Excitation controllers with excellent performance, many functions and high reliability are urgently needed to meet the requirements of power system stability and comprehensive automation. The main function of the automatic excitation regulation system is to maintain the generator terminal voltage constant or at a given level under the condition of generator output change and system failure; to ensure the reasonable distribution of reactive power between units; to improve the stability of power system operation and Improve the sensitivity of relay protection actions. With the development of the market and the advancement of technology, there is no market and technical obstacles in applying PLC technology to the excitation regulation system. It has broad market prospects: stator winding equation rotor winding equation d-axis current; rs is stator winding equivalent resistance ;x'd is the direct-axis transient reactance; E'q is the q-axis transient potential; x'g cross-axis transient reactance; T'd0 is the time constant of the field winding when the stator winding is open; T, is the stator winding open circuit Time constant of the q-axis damper winding; Tem is the electromagnetic torque; 2H is the inertia time constant of the rotating object; is the angular velocity of the rotor; is the rated angular velocity of the rotor; Wh is the base value of the angular velocity of the rotor; Tmech is the driving torque (mechanical torque) T * is the damping torque; Ef is the potential generated by the exciter. At the same time, the system also adds a power system stabilizer (PSS). The PSS can use one or several signals of the speed deviation Aw, the frequency deviation Δ/, the acceleration power deviation Apa, and the electric power deviation APe as the additional signal input of the automatic excitation regulator. To generate positive damping torque, improve the static stability of the power system, and suppress low-frequency oscillation. The purpose of using the power system stabilizer is to increase the stability limit of power transmission by the generator excitation control to strongly oscillate the system oscillation. Using the above model, the system was simulated with SIMULINK, and the simulation results are shown. It is a simulation result curve of terminal voltage Vt, angle de/ta, active Pgen, and reactive Qgen without PSS and PSS. In the figure, the solid line is the case with PSS, and the broken line is the case without PSS, and each quantity is represented by the standard value. From the curve of the terminal voltage, it can be seen that the terminal voltage is basically kept constant in the presence or absence of PSS, which is in line with the fact that the actual terminal voltage is substantially unchanged. It can be seen from the angle simulation results that the oscillation of the rotor angle of the generator is reduced after adding PSS, indicating that the PSS reduces the oscillation of the generator itself. It can be seen from the simulation results of active and reactive power that the active and reactive oscillations are reduced after adding PSS, which fully demonstrates the powerful role of PSS, making the active and reactive power generated by the generator more stable and ensuring the power supply. The quality, which also reduces the system oscillation, compensates for the low-frequency oscillation caused by the negative damping without PSS, which makes the power system tend to be stable. 4 Conclusion PLC excitation regulator has more remarkable features than traditional microcontroller excitation regulator, such as high reliability, simple structure, intelligent adjustment and flexible control. The results of the research show that the power system stabilizer greatly improves the stability of the system, and the variation law of the system performance with or without PSS is obtained and compared. Exchange Table Fiber Laser Cutter Exchange Table Cutter,Exchange Table Laser Cutter,Exchange Table Fiber Cutter Jinan Jing Xun Cnc Equipment Co., Ltd , https://www.jnjingxuncnc.com