Method for connecting power load to distribution network and load balancing method

Abstract

The invention discloses a method for connecting a power load to a distribution network and a load balancing method. For the access method, before a power load of a user is connected to a distributionnetwork by a commutation device, calculation is carried out based on a commutation device trial access power estimation value and total power loads of all user terminals to determine the to-be-connected target phase, so that the three-phase loads of the distribution network are kept to be balanced. Therefore, the number of the commutation device of phase switching as well as the harmonic interference to the distribution network is reduced. In addition, according to the balancing method, the three-phase loads of the distribution network become unbalanced and a phase switching pair and an adjusting amount value are determined; commutation devices, not providing power for a built-in magnetic moving part load unit, of the source phase are marked; in terms of the source phase, the marked commutation device needing phase switching is selected; if the marked commutation devices are not enough, un-marked commutation devices are selected; and the phases of the selected commutation device are switched to the target phases, so that three-phase load balancing is realized. No commutation vibration is caused by the load device of the user terminal and thus the load device works stably.

Description

technical field [0001] The invention relates to a three-phase load balancing technology for a distribution network, in particular to a method for connecting power loads to a distribution network for a low-voltage distribution network, and a three-phase load balancing method for a low-voltage distribution network, belonging to Low-voltage distribution network power distribution technology field. Background technique [0002] The load of the distribution transformer in the distribution network is generally composed of a mixture of three-phase load and single-phase load. Residential electricity is all single-phase load, and the distribution network is relatively complicated, especially the distribution system where a large number of single-phase loads are connected to the low-voltage distribution network. , and the load size is different and the power consumption time is different. Therefore, the imbalance between the three phases of the low-voltage distribution network is irre...

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Problems solved by technology

The method disclosed in the above-mentioned Chinese patent is to switch the phases of the user terminals connected to the distribution network in real time, so that the low-voltage distribution network maintains a three-phase load balance operation, but it only performs balancing processing after the user terminal is connected to the distribution network, which requires The number of user terminals that are switched separately, on the one hand, generates harmonic interference to the low-voltage distribution network, and on the other hand, affects the stable operation of load devices equipped with magnetic moving parts at the user end, such as washing machines and air conditioners with built-in magnetic moving parts. When the motor is switched from one phase to another, the phase changes suddenly, causing the magnetic drive parts to vibrate violently, generating noise, and even damaging the magnetic moving parts

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