Distribution control method for regulating single-phase load following three-phase balance

Abstract

The invention discloses a distribution control method for regulating single-phase load following three-phase balance, and belongs to the technical field of electric power supply and distribution, a control system realizes the comparison of each phase current with an average value thereof; the three-phase balance of the distribution area is determined if the difference values between the phase currents and the average values are small (less than 5%); the control system designates any phase power supply to supply power for subsequent access single-phase load. If one or two difference values between the phase currents and the average values are greater (greater than 5%), the three phases of the distribution region are unbalanced; according to the specific situation of the three phase currents, the control system chooses the subsequent power supply phase to be put into the power supply for supplying power for the subsequent access single-phase load; By abandoning the close range transmission mode of Zegbee, a transmission line is used to transfer information, the system control reliability is ensured, meanwhile, the power supply phase to be accessed is determined according to the current load condition, the load adjustment with the three-phase balance as the target can be effectively realized, the three-phase balance of the power supply and distribution system is realized, and theoperation economy and stability of the system are improved.

Description

technical field [0001] The invention belongs to the technical field of electric power supply and distribution, and in particular relates to a single-phase load adjustment and distribution control method following three-phase balance. Background technique [0002] During the operation of the entire power system, the power distribution system cannot guarantee the symmetry and balance between its three-phase loads. As a result, according to the symmetrical component method, negative sequence current will flow in the power system. The negative sequence current generated by asymmetric operation will have a very adverse impact on the power generation system, endanger the stability of the power system, and affect the economic operation of the power supply and distribution system. Therefore, it is necessary to maintain the symmetrical and balanced operation of the power system. [0003] Patent application number CN201610305897.8 "A method for controlling three-phase load imbalance i...

AI Technical Summary

Problems solved by technology

Because of the unbalanced load, the controller assumes that the three phases on the low-voltage side are balanced by adjusting the power supply phase of the load to achieve load redistribution. According to the scheme, the problem of reconnecting the load after power failure will inevitably occur, which will affect the load. normal operation of

[0005] 2. This patent analyzes the load conditions of the low-voltage power distribution side and determines the phase of power supply. However, the actual situation is that the access of loads is random, and the size, nature, and timing of the loads to be accessed are very important to the control system. It is unknown, and in actual work, the power supply phase to be put in later can only be determined according to the current load of each phase;

[0006] 3. The transmission distance of the Zegbee system is limited, and the reliability of transmission is difficult to guarantee

The power supply system has always been recognized by the public with its high reliability requirements. Naturally, the reliability of its control system is a prerequisite for the reliable power supply of the power supply system. The transmission distance of the Zegbee system is extremely limited, and the reliability of transmission is difficult to guarantee. The practicability and reliability of patents can be discounted

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