Abstract
| In this paper is presented in a constructive and functional way an instrument that can be used at connecting synchronous generators at the grid supply that has a constant voltage and frequency. Actually it is about a virtual synchronoscope that verifies the correct instant for the synchronization: phase sequence of the generator must be same with the grid, the generator frequency must be equal to the grid frequency, the generator voltages should be equal to the corresponding grid voltages and the generator voltages should be in phase with the corresponding grid voltages. After the conditions of synchronization between synchronous generator and large power grid are occur, the parallel operation of generator is realized automatically. The virtual synchronoscope is designed from two principal components: hardware (LEMs transducer for measurement six voltages, supply voltage, elements for input/output signals conditioning, USB multifunction I/O module) and software (virtual instrument). The main objective of this paper is to create aneasy to use device for the study of network synchronization synchronous generators. The LabVIEW graphical programming environment is used for designing virtual instrument. The monitored parameters values are displayed using digital indicators. The real-time voltage waveforms for grid and generator are displayed. With three-phase voltage phasors (voltage vectors) we can see the evolution of phase angles and voltages amplitude. This virtual synchronoscope can be used in engineering education from universities or intesting laboratories of electrical machines. |
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