Análise dos impactos provenientes da instalação de bancos de capacitores na fronteira com a rede básica

Abstract

The continuous verification of performance indicators and the minimum technical requirements required by the regulation of the electricity sector aim to list conditions that may affect the operation of the electric power system and the performance of its equipment. The result of this verification defines the actions of agents in that system and defines their responsibilities when accessing or remaining in this system. The regulation standard associated with access to systems establish the criteria, assumptions and limit values associated with performance indicators. The power factor, although monitored in steady state, provides an increase in electromagnetic transients in that system due to the switching of capacitor banks with the objective of providing adequacy of its value range. In this regard, the current regulation establishes that the transients of energization of shunt capacitor banks installed for power factor correction must not affect the performance of transmission installations or agents connected to the basic network and must not cause the overcoming of preexisting circuit breakers. In this way, it is proposed to determine a range of capacitive reactive power values that allow not exceeding the reference values assigned to the steady state voltage of the power system, to the energizing transients of the shunt capacitor banks and the transient recovery voltage in the circuit breakers adjacent to the busbar at 138 kV from the secondary of 2 basic network transformers at voltages of 440kV and 500 kV. The analyzes involved 2 load level scenarios. It concluded the 20 MVAr, 40 MVAr and 60 MVAr capacitor banks and filters do not promote a transgression of the limit values attributed to the steady state voltage in the border buses. In addition, under the conditions simulated in this work, the capacitor banks and filters do not support the overcoming of circuit breakers due to their energization currents and the transient recovery voltage for the proposed scenarios.