Application of Fuzzy Decision in Lighting Control of Cities

Based on microprocessor a new intelligent control scheme is developed for city illumination systems. It eliminates pulse interferences of environmental light, such as fulmination, by using time delay filer, and distinguishes persistent interferences, such as welding flare and car light, based on fuzzy decision theory. The control system can turn on or off the transformer automatically according to environmental light, solving the trembling problem of breaker. It is not only suitable for control of streetlights but also suitable for lighting of enterprises. The paper also presents the hardware of the controller, detection circuits and software diagram. Experimental results show that both the pulse and persistent interferences can be distinguished and reduced by the proposed techniques.