Patent ID: 6314378
Filing Date: 2001-11-06
Classification: H02J,Y02B,Y04S

Abstract:
A method of increasing the system stability of an electricity supply network, said method including locating programmable frequency sensitive relays at load shedding points within said network, characterized in that each of said relays controls one or more loads connected to said network and contains programmable disconnect and reconnect conditions such that one or more said loads are disconnected from said network upon said relay detecting said programmable disconnect conditions on said network, and such that one or more said loads are reconnected to said network upon said relay detecting said programmable reconnect conditions on said network;programming each said relay by a centralized network stability manager with respective programmable conditions transmitted by a broadcast or sequential point to point communications link,wherein said programmable disconnect conditions include a low frequency disconnect level and a rate of decrease in frequency disconnect level, and said programmable reconnect conditions include a high frequency reconnect level and a rate of increase in frequency reconnect level.