Wireless Control System Design for Coal Transportation Plant Based on Two-part Tariff System

Under the current tariff policy, large industrial users, such as coal transportation companies, are typically charged a two-part tariff. This tariff policy limits the maximum value of the average load every fifteen minutes for a month, with an additional charge for electricity consumption when the threshold is exceeded. The article proposes a wireless monitoring and control system for coal transportation plants in response to this policy. First of all, the backup power supply and control circuit were added to the electric equipment of the coal transportation plant. Then build a ZigBee wireless sensor network, terminal and relay connected, coordinator and PLC connected. Finally, when the sensor monitors the actual electricity consumption is about to reach the maximum value set in the PLC, PLC sends a command through the ZigBee to control the relay action and switch to the backup power supply. The experimental results show that the wireless control system has a clear structure and effective strategy, which can reduce the basic electricity cost of the coal transportation plant.