Warunki rezonansowe w węźle z kompensatorem SVC

Instalowanie kompensatorów statycznych w sieciach rozdzielczych i przesyłowych służy poprawie profili napięciowych. Kompensatory jako źródła mocy biernej zwiększają stabilność napięciową systemu. Pozwalają także na szybszą odbudowę systemu w przypadku awarii napięciowej. W artykule zaprezentowano wpływ struktury i wysterowania układu SVC na zmianę impedancji w układzie zasilania. Ma to bezpośredni wpływ na częstotliwości, przy których może dojść do wzbudzenia zjawisk rezonansowych.

Installation of static compensators in distribution and transmission networks favours improvement of the voltage profile. Compensators as sources of reactive power increase the voltage stability of the system. They also enable faster restoration of work system in case of voltage failure. The power system is characterized by a high inductance resulting from the nature of its components. Connection of these elements with the compensator system containing capacitive elements, may contribute to the excitation of oscillation resonant in power supply system. The structure and control system of compensator, in addition to the network parameters are influenced by the resonance conditions occurring in its connection point. In this article the research results of influence structure and control of SVC system on the resonance frequencies are presented. It has been found that the change of trigger angle of the TCR thyristors of shunt reactor results in change of its susceptance as well as the value of resonant frequency in a narrow range. On the other hand, switching on next section of TSC causes step changes of resonant frequency. The overlap of these phenomena leads to an increase of frequency ranges at which favourable conditions for the appearance of voltages or currents resonance occur.