Abstract
In units’ grid-related protection, loss of excitation protection and out-of-step protection are very important to ensure the stable running of grid. If both can realize the right coordination when unit occur a phenomenon of low excitation, it can improve the level of power source coordinated with grid. However, there is a problem in the coordination of both. Propose an idea to solve the problem based on power angle. Besides, out-of-step protection and out-of-step splitting exists a coordination relation according to the location of out-of-step oscillation center. In order to prevent the collapse of grid and protect units, it is necessary to cut off out-of-step lines and units correctly. Summarize the reasonable coordination relation between both by theory analysis and research.
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