At present, the country has developed in the economic and social aspects, as well as to the expansion of the industrial sector continued to result in Nice, clean electric power demand has increased, and as a result of these problems to the stability, and stability with the power distribution system, such as the Add threshold power transmission through the transmission line and power flow control problem in the power transmission system that is complex to meet that need. There are also problems with the quality of the electrical power in the distribution system, such as the problem of voltage or a problem to the harmonic kapen.
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