Abstract. Due to electric equipment development and complication it is necessary to have a precise and intense diagnosis. Nowadays there are two basic ways of diagnosis: analog signal processing and digital signal processing. The latter is more preferable. The basic ways of digital signal processing (Fourier transform and Fast Fourier transform) include one of the modern methods based on wavelet transform. This research is dedicated to analyzing characteristic features and advantages of wavelet transform. This article shows the ways of using wavelet analysis and the process of test signal converting. In order to carry out this analysis, computer software Mathcad was used and 2D wavelet spectrum for a complex function was created.
The article presents the Hybrid Real-Time Dispatcher Training Simulator (HRTDTS). The main advantages of this simulator are the adequate simulation of a single spectrum of processes in the object for training – any real electric power system (EPS), as well as the real-time control of the equipment circuit-mode states in modes of the EPS operation. This is achieved by the HRTDTS development within the concept of hybrid simulation, which allows to surpass the modern widely-used simulators based purely on numerical simulation, which do not comprehensively reproduce processes in the EPS and limit the training of certain dispatchers skills. The dispatcher simulator structure and the developed specialized HRTDTS software are demonstrated. The developed dynamic dashboards for monitoring and operating, implementing the circuit-mode states visualization of the equipment or the EPS districts that correspond to specific objects for training, are presented. The special panels that display extended information about the processes in the EPS are also shown in the article. The comparison of simulation results with the data, obtained via RTDS, for the HRTDTS validation was carried out. The practical emergency scenario for the training of dispatching personnel, including the assignment of an emergency situation and the actions of dispatchers to eliminate it, was created for testing and demonstration of the HRTDTS capabilities.
The phase shifting transformer in the electric power system (EPS) provides more efficient control of EPS modes by voltage and active power flow regulation. However, nowadays quasi-steady and transient processes in the EPS become more complicated. As a result, the commonly used simulation tools apply decomposition of EPS processes to quasi-steady and transient, simplification of mathematical models of EPS elements, limitation of the simulation time interval. Mentioned simplifications and limitations in general lead to an uncertain loss of completeness of EPS modeling. The concept of software and hardware tools of phase shifting transformer simulation, presented in the article, allows to solve this problem. The software and hardware of phase shifting transformer simulation are the tools of hybrid simulation, which include analog, digital, and physical approaches of the simulation. The analog approach is the solution of the differential equations system, describing the phase shifting transformer processes by continuous implicit integration. The digital approach provides the control of the electronic switches, the phase shifting transformer parameters, such as leakage inductance, active resistance etc. The physical approach is the connection and switching in the EPS elements as in real EPS. The article presents the all-mode thyristor-controlled phase shifting transformer model, developed by hybrid simulation approach and adapted for use in the Hybrid Real Time Power System Simulator developed in Tomsk polytechnic university. The appropriate research of phase shifting transformer in the EPS was carried out by Hybrid Real Time Power System Simulator, in which the Tomsk EPS (region of Russia where there is a problem of non-synchronous operation of the northern and southern parts) is implemented. By means of the Tomsk EPS model and developed phase shifting transformer model, the purpose of which was to interconnect two asynchronously operating parts of the Tomsk EPS and experimental research were carried out.
Abstract. The article considers the simulation of surge voltage protection. A functional diagram of this protection model and the means by which the researches were made are presented. The results are the oscillograms of the surge voltage protection operation for the generator.
Abstract. Wind power -one the fastest evolving in renewable energy industry. From year to year the share of wind energy in power systems are increasing as well as increasing the size of wind farms. A large-scale wind farms that produce hundreds of megawatts of electricity have a serious impact on the power grid. This paper discusses proposed approaches to modeling wind farms using the Hybrid Real-Time Power System Simulator (HRTSim), to study stability and transient processes in electric power systems.
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