| Budget Amount *help |
¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 1988: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1987: ¥700,000 (Direct Cost: ¥700,000)
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| Research Abstract |
So far, researches on transient stability problems by energy function methods have been conducted by many researchers. And it has become general that transfer conductance terms can not be analytically integrated and must be caluculated numerically. In this research, a new approach is proposed based on the Kakimoto-Ohsawa-Hayashi method, and taking a Taylor expansion of the energy function. In particular, it has been proposed that coefficients in the taylor expansion be obtained by using the algebraic processing language "REDUCE". In order to determine stability by the energy type function, firstly a critical energy is identified and secondly the energy referred to the post fault system is compared with critical energy along the system trajectory. Many methods have been proposed to identify this critical energy, but no solution technique using the energy type function has replaced the conventional method, or so-called the simulation method. The reason is the reliability of the solution. In this research, the second swing stability and loss of synchronism under deceleration have been considered as factors of this reason, and a new concept called "RIDGE" had been developed for identifying stability regions after through investigation using graphic pictures. Recently, it has been reported that the system separation depends on the energy of the machine which tends to separate from the rest of the machines. The RIFGE theory has succeeded in identifying the machine. In this research, it has been proposed to use the individual energy function of the machine which is identified as the critical machine. With this, the Taylor expansion has been used to compute the trajectories as a fast method for on-line use. Also it has been proposed to express internal bus voltage angles without constructing the reduced Y-bus matrix.
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