Control system and method based on three-phase load balancing

Abstract

The invention discloses a control system and method based on three-phase load balancing. The hardware design of a three-phase load balancing system is introduced in details; and the hardware designs of all modules are demonstrated in details based on providing of an overall design frame of the system. In introduction of a signal monitoring module, the process of collection and processing of three-phase six-channel electrical signals of a low-voltage distribution network and calculation of the three-phase unbalancing degree are demonstrated from three parts including a signal monitoring moduledesign, an A/D conversion circuit design, and a data processing circuit design. In introduction of a communication module, a DSP and a single-chip microcomputer as well as communication modes of the single-chip microcomputer and an actuator are explained mainly. In introduction of a control module, power electronic switching devices used by the actuator as well as the control principle of the bidirectional thyristor by the optocoupler are described and the commutation process and interlocking of the actuator are demonstrated in details. Under adjustment of the three-phase load balancing system, the low-voltage distribution network can work stably.

Description

【Technical field】 [0001] The invention belongs to the technical field of power system distribution network load adjustment, and relates to a control system and method based on three-phase load balance. 【Background technique】 [0002] As the end link of power supply and distribution of the power grid, the low-voltage distribution network is not only an important part of the national power system, but also an important basic content of urban development and new rural construction. Since the low-voltage distribution network directly faces power users, ensuring the stability of the power supply of the low-voltage distribution network and improving its power quality are the top priorities of the relevant departments of the power system. In recent years, the State Grid Corporation of China has continuously strengthened the transformation of rural power grids and implemented rural power grid system reforms, which has greatly improved the electrification level of rural areas and pro...

AI Technical Summary

Problems solved by technology

However, the development of the rural economy puts forward higher requirements on the power quality and the stability of the power network, and also brings many new problems, such as: harmonic pollution of the power grid, voltage fluctuations, and the increase of reactive loads. At the same time, with the entry of high-power household appliances such as inverter air conditioners, induction cookers, and microwave ovens into ordinary households, the proportion of low-voltage single-phase loads has increased, and the three-phase load of the power grid has become unbalanced.

Among them, in the low-voltage distribution network of the three-phase four-wire system, the problem of unbalanced load of the three-phase power grid is particularly prominent, which shortens the life of the power transformer, increases the line loss, and poses a threat to the power quality and the stability of the power network. Serious impact

In particular, the problem of unbalanced three-phase loads is particularly serious in rural areas in southern my country. The use and shutdown of electrical equipment in many cigarette factories not only seriously affects the normal operation of power equipment but also affects the stability of low-voltage distribution networks.

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