Search

This paper analyzes the impact it causes on the rates of electric power quality, a significant number of nonlinear loads belonging to a computer center and connected to a three-phase. A simple computational method is presented that can be used to analyze the effects caused by loads with a high level of distortion. Different models of personal computers (PCs), monitors and printers were tested in laboratory for the purpose of recording the current signals and the main electrical parameters. With these results and ATP (Alternative Transient Program) program assistance equivalent models of equipment were simulated to evaluate the different phenomena that cause the current harmonic components. The effects of attenuation and diversity are analyzed considering different scenarios: models of PCs identical but on different operating systems, PCs, monitors and printers combined. Simulations showed that a major natural harmonic mitigation occurs due to changes in rates of current harmonic distortion of the devices studied, and the impedance of the power line. For any combination of equipment there is a reduction THDI 14% and 40% depending on the inductive reactance-resistance ratio of the power line. The simulated results were compared with measurements in the data center of a utility company with 120 PCs distributed in a three-phase network. The monitoring was performed using a network analyzer over a week, recording line currents, rates of current and voltage distortion with their harmonic components. [ABSTRACT FROM AUTHOR]