| 摘要 |
In an electrical load control system, method and apparatus are provided for selectively, individually connecting and disconnecting a plurality of loads to and from a power source. The loads are selectively connected (added), disconnected (shed), and reconnected (restored or added), in a predetermined sequence, wherein the ranking of the loads in such sequence is selectively rotated in a manner which results in a sharing of on and off time and an equalizing of wear among all of the loads. As an example of this operation, a load control system is disclosed in which the consumption of electrical power is varied by periodically shedding and adding individual loads in order to maintain the level of power usage below predetermined limits and yet make full use of the available power within such limits. For this purpose, a load regulating circuit monitors the power consumption and issues either an add command signal causing one or more loads to be connected, or issues shed command signal causing one or more of the loads to be disconnected, that is, shed. To uniformly distribute the off time associated with shed loads among all the loads, a load switching circuit means and a load rotation circuit means are provided for rotating the order in which the loads are shed, and thereafter restored or added. The rotation takes two forms. First, the order or rank in which the plurality of loads are shed, is shifted or rotated after each occurrence of a condition in which all of the loads have been turned on. Secondly, when less than all of the loads are on, the on-off ranking or status of the loads, resulting from the preceding add or shed command, is periodically shifted or rotated among all of the loads, in order to share the available electrical power on a timed rotation basis. Thus, the disruption of load service due to the curtailed power, is time shared among all of the loads on an equal, non-priority basis.
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