One of the most important measurement devices in Power systems is Phasor Measurement Unit (PMU). The PMU is a power system device, capable of measuring the synchronized voltage and current phasor in a power system. In this paper we introduce the PMU and then we acclaim according to the PSAT, MATLAB toolbox, and different algorithms we can allocate the PMU in IEEE 14-bus and 57-bus system simulated, optimally. By comparing them, we found that, we can't say an algorithm is optimal for all systems. good allocation can reserves the finance and obtain better power network monitoring.
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