Method and system for identifying energy consumption of electrical appliance

A system for identifying energy consumption of electrical appliances, comprising a string current controller, terminal controllers and a detector,

• the string current controller is connected to a power supply and the detector at the same time;
• the string current controller is connected to one or more strings of terminal controller string group, wherein each string of terminal controller string group includes one or more terminal controllers connected in series according to priority and each terminal controller is connected to a group of electrical appliances;
• the string current controller sends an identity authentication command to each string of terminal controller string group, every terminal controller in each string of terminal controller string group sequentially receives the identity authentication command in descending order of priority levels, and forwards the identity authentication command to a next-level terminal controller in turn, each terminal controller then reports an identity information by level from low to high according to the priority level, and eventually the string current controller receives the identity information;
• the string current controller sends an action command to turn off all the terminal controllers, detects a current of the string current controller at this time, and defines and records a power at this time as a target power;
• the string current controller sends an action command to turn on the terminal controller with the highest priority in the terminal controller string group and controls it to work with minimum power, detects a current of the string current controller at this time, and defines and records a power at this time as the lowest power of the terminal controller with the highest priority;
• the string current controller controls an operating power of the terminal controller with the highest priority to sequentially increase, and detects the current of the string current controller, and records the power until the string current controller is overloaded and/or the power of the terminal controller with the highest priority has reached the maximum power;
• above recorded power is added to a load power of the group of electrical appliances connected to the highest priority terminal controller to generate and record the total power at that time, if the total power value at this time is greater than the rated power of the string current controller, an alarm is issued, if the total power value at this time is less than the rated power of the string current controller, the string current controller sends an action command to turn on the terminal controller with the second priority in the terminal controller string group and controls it to work at the minimum power, above detection process is repeated until all the terminal controllers are turned on and have been detected.