Wide-area Power System Based On The Theory Of The Electromechanical Wave Frequency Deviation Monitoring System Research

Large-scale interconnected power system is subjected to various impacts duringoperation period. As a result, electromechanical dynamic processes will cause thefrequency deviation in the whole network，with significant space-time characteristics。Meanwhile, the electromechanical disturbance propagates in the grid which makes theimpact of active power in the system increasing，and threatening the secure and stable ofpower system. Although high inertia of the generators makes the frequency deviation’schanging relatively slow. But the transmission of electromechanical disturbance in thepower system is a potential hazard to the entire power system security and stability. It isvery important to study the electromechanical disturbance.This paper focuses on the theory of the continuum model for the power system.The continuum model theory is applicable to large-scale power systemelectromechanical dynamics method. In this method, we use continuous densityfunction to describe the entire system, and consider the network structure of theelectricity network, moment of inertia, damping, and line impedance as a continuousfunction on the spatial location, and then establish a wave equation to describe thedynamic electromechanical procedure. The method is based on a global point of view,described the electromechanical dynamic process of the power system from alarger-scale space, and different from the traditional research methods.After established the electromechanical wave model and getting theelectromechanical wave equation, according to the continuum electromechanical wavesecond-order partial differential equation, we use small signal analysis method to studythe analytic solution of the electromechanical wave equation. This paper described thepropagation of electromechanical disturbances in the power system and simulated thepower system model of the one-dimensional ring system, and the simulation resultsprovides a strong support the electomechanical wave model and verify the correctnessof the propagation according to the the analysis of wave equation.According to the propagation of electomechanical disturbances in the power system, an improved disturbance location algorithm was proposed. Experimental dataverify that the algorithm is more agree with the electromechanical wave model for thepower system, with higher position accuracy. Then improved the matrix operationssection which can be computed parallelly easyily, based on GPU parallel computingmethod, the algorithm increased the computation speed.Finally, this paper proposed the design scheme of the whole system and useVisual C++development tool to develope this monitoring system. The wide-areafrequency monitoring system of power system mainly includes the function of dynamicvisual display of frequency deviation for and the disturbance location function.