Method and device for handling three-phase imbalance

Abstract

The invention provides a method and device for handling three-phase imbalance, belonging to the technical field of electric power. The method for handling three-phase imbalance is applied to a power distribution network line which is a three-phase circuit and has a function of communication with a load based on a dual-mode communication technology. The method for handling three-phase imbalance comprises the following steps: respectively acquiring the load condition of each phase of circuit in a three-phase circuit; based on the load condition of each phase circuit, judging whether a load quantity difference between the phases of circuits is greater than a threshold value or not; when the load quantity difference value between any two phases of circuits in the three-phase circuit is greater than a threshold value, determining a high-load phase of circuit in each phase of circuit based on the load condition of each phase of circuit; and performing commutation connection on a preset number of single-phase loads in the high-load phase of circuit to other phases of circuit in the three-phase circuit. According to the method and device provided by the invention, the single-phase loads can be controlled to automatically change phases in the three-phase circuit, so the phenomenon of three-phase imbalance can be effectively handled.

Description

Technical field[0001]The present application belongs to the field of power technology, and more particularly to a three-phase imbalance control method and device.Background technique[0002]In the construction of distribution network, the construction and operation management management of low-voltage distribution networks have been unreasonable, and the planning and design of low-voltage distribution network has been unreasonable, and the equipment selection is not scientific. The phenomenon, especially in the peak period of summer, the low-voltage line overload, three phases is unbalanced, over, low voltage, etc., resulting in frequent overheating, short circuit, and low voltage distribution network, and the three-phase load is long When unbalanced, the transformer life will be affected, causing the transformer to be burned.[0003]Therefore, it is necessary to study a governance method for the three-phase imbalance phenomenon. Implementation of the governance of the three-phase unbal...

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Problems solved by technology

[0002] In the construction of the distribution network, compared with the main network, the construction and operation and maintenance management of the low-voltage distribution network have not been paid much attention to, which to some extent has led to unreasonable planning and design of the low-voltage distribution network and unscientific equipment selection. Especially in the summer peak period, the phenomenon of low-voltage line overload, three-phase unbalance, over-voltage and low voltage is more serious, resulting in frequent overheating and short-circuit of low-voltage distribution network equipment, and the three-phase load in the low-voltage distribution network is serious for a long time When it is unbalanced, it will affect the life of the transformer and cause the transformer to burn out, etc.

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