Hybrid Emergency Control for Power Systems

Abstract

Vo ltage stability is one o f the key issue s in the o pe ratio n o f mode rn po we r syste ms. M any e mergenc y contro ls have bee n carried out to prevent vo ltage co llapse . In this pape r, a hybrid method is pro posed fo r power syste m emergenc y co ntro l to coo rdinate seco ndary vo ltage co ntro l and load-shedding. T he pro po sed hybrid technique consists o f two laye rs: the lo we r laye r is the local co ntinuo us-time contro lle rs, while the higher laye r is the supervisory o ne drive n by the disc re te-e vents to coo rdinate the low-le vel co ntro lle rs. In this paper, the co nce pt o f hybrid syste m is introduced rst. T hen the imple mentatio n o f a hybrid method for the e mergency co ntro l is described. Simulatio n re sults o n the data o f a real syste m verify the e OE ec tive ness of the pro po sed hybrid contro l methodo logy. K eywords hybrid system, power system emergency control, voltage stability