Three-phase unbalanced stepwise adjustment method of power distribution transformer area

Abstract

The invention discloses a three-phase unbalanced stepwise adjustment method of a power distribution transformer area. In the three-phase unbalanced stepwise adjustment method of the power distributiontransformer area, a three-phase imbalance switching device and a three-phase load balance automatic adjustment compensation device are included. The method comprises the steps of firstly adjusting athree-phase unbalanced load by utilizing the three-phase imbalance switching device; and then adjusting an electric capacity needing to be compensated in the power distribution transformer area by applying the three-phase load balance automatic adjustment compensation device. by using the three-phase imbalance switching device and the three-phase load balance automatic adjustment compensation device in combination, the three-phase unbalanced stepwise adjustment method of the power distribution transformer area greatly reduces the compensation capacity and does not need simultaneous compensation for the three phases. In addition, the use amount of equipment is also reduced, and the equipment cost is accordingly reduced; and furthermore, the three-phase balance degree becomes higher and thepower factor is closer to 1.

Description

technical field [0001] The invention relates to a step-by-step adjustment method for three-phase unbalance in a power distribution station area, belonging to the field of power transmission and distribution. Background technique [0002] In order to alleviate the phenomenon that the unbalanced three-phase load leads to the continuous increase of line loss and affects the power quality, three-phase balanced distribution is usually carried out before the load in the distribution station area is connected. However, due to the fluctuation of the actual load, there is still a large three-phase unbalance phenomenon. At present, the static solution is mainly used, that is, according to the data predicted in advance, the asymmetrical load is distributed on different nodes, thereby greatly alleviating the balance problem. Adjustment, so as to achieve the purpose of basic balance of the load of each phase. However, the unbalanced degree of load is time-varying, and has great randomn...

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Problems solved by technology

However, the unbalanced degree of load is time-varying, and has great randomness and uncertainty

Therefore, the above method cannot completely and effectively solve the three-phase load balancing problem of the distribution network.

[0003] On the one hand, if the scheme of installing three-phase unbalanced power switching devices at suitable nodes to achieve dynamic balance compensation is used alone, the cost is low and more economical, but it has a strong delay and cannot fully achieve balance

On the other hand, the three-phase load balance automatic adjustment and compensation method can solve the delay problem and achieve complete balance, but the cost is high, reactive power overcompensation is prone to occur, and the line loss increases

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