Non-invasive power load decomposition method

Abstract

The present invention relates to a non-invasive power load decomposition method, and belongs to the field of power measurement technologies. The method comprises: first collecting instantaneous current when each power device is switched, and introducing a primary function to decompose the instantaneous current, so as to obtain a current amplitude when each power device is switched; using a minimum value of a difference between a current amplitude at a user power inlet and a current amplitude of each input power device as an objective function; and solving the objective function by using an optimization algorithm, wherein an obtained result is a switching situation of each power device in power load. According to the method provided by the present invention, the switching situation of power load can be acquired online in real time, the decomposition method has relatively high precision and relatively good stability, and a computation speed is high. The present invention can be applied to a plurality of technical fields such as power system load monitoring, power analysis, load energy saving, load prediction and load modeling, and has a significant meaning to energy saving of the whole society and power system planning and operation.

Description

technical field [0001] The invention relates to a non-invasive power load decomposition method, which belongs to the technical field of power metering. Background technique [0002] Non-intrusive power load monitoring is a cutting-edge technology for monitoring the working conditions of electrical equipment. This method refers to installing voltage and current sensors at the user's power inlet, collecting voltage and current data in real time, and analyzing them with software to obtain load information. The real-time power consumption ratio of different internal electrical equipment is used to identify the switching status of household electrical equipment based on the above information. The non-intrusive load monitoring method was first proposed by Hart in the 1980s, which mainly monitors the steady-state power change at the load inlet to achieve load decomposition. After the concept of non-invasive decomposition technology was proposed, it has been extensively studied at ...

AI Technical Summary

Problems solved by technology

[0006] The above methods have achieved the function of non-intrusive load decomposition to a certain extent, but there are problems: the first method will cause misjudgment when multiple electrical equipment is put into use at the same time, and can only judge the type of electrical appliances used. Load decomposition is not possible; the second method requires detection equipment to collect a large amount of data in a short period of time, and the existing conventional power equipment cannot meet the requirements; the third method is a decomposition method based on historical data statistics. For small power grid users, Due to the large randomness of the user's electricity consumption behavior, this method has a big problem in the decomposition accuracy

Images