Optimal Control Of Automatic Voltage Control System In Power Plant

Power system reactive power optimization, and compensation is an important part of the power system safe and economic operation. Through the rational allocation of reactive power with power and reactive load compensation, not only to maintain voltage levels and improve the stability of power system operation, and can reduce network losses, so that the power system is safe and economical operation.Although the majority of domestic scheduling carried on each node voltage control, or have been using the traditional management mode voltage control, power plant side, the generator reactive power, high-voltage bus voltage primarily by power plant staff on duty in accordance with the requirements of the system operator Artificial regulation. This adjustment only way to ensure that the voltage passing part-time, some nodes, but with the economic operation of power systems, the goal is far from reliable power supply. Expanding the grid, running has improved continuously, to promote automated dispatch management, management methods that rely on human intervention has not meet the requirements and development of the grid. Substation side, despite the installation of a reactive power switching equipment, reactive power compensation device, but is still far from achieving these reactive power conditioning equipment from a global perspective grid automatically.This article focuses on the application of structural power plant AVC automatic control devices,communications platforms and communication protocols, specifically addressed the automatic voltage control (AVC) plant installation configuration, pressure principle, software setup, test conditions and actual effect. Power AVC system via communication links Remote Terminal Unit (RTU) and scheduling side, accepting the scheduling order, automatic voltage regulation function. It not only with the optimization of reactive power control, reactive power optimization, but also to achieve independent control of power plants, improving the bus voltage level. By collecting bus voltage, bus reactive power (main transformer high voltage side reactive), real-time bus data, the unit active and reactive power, stator voltage, stator current, excitation voltage, excitation current, real-time calculation of the system impedance of the power plant side, through specific algorithm to predict the value at a set target voltage bus injection of reactive power; through the unit PQ curve, determine the unit reactive power limit, and no amount of work in order to change the bus unit adjustable weights reactive manner reactive unit reasonable adjustable units allocated to each line. While the various security constraints embedded in the present system, in the process of running real-time, take into account all the constraints limit indicators and operation of the unit to ensure that the generator allowed parameters under safe and stable operation, for the occurrence of each case both the judgment and restraint, to meet site security requirements.