To guarantee a consistent and reliable power supply continues to escalate, there is an increasingly urgent and imperative need to establish robust mechanisms for controlling load capacity, while also ensuring the timely dissemination of notifications and warnings. Starting from the demand for electrical load, this article introduces the recognition technology of operating load characteristics of typical important electrical equipment such as security, medical and basic life equipment, and designs new voltage and current sensors. Through the study of load flexible control technology based on constant power control (PQ control), it realizes the control of non-essential electricity consumption of specific customers according to their electricity consumption characteristics.