A three-phase unbalance optimization method for low-voltage distribution network

Abstract

The invention discloses a three-phase unbalance optimization method for a low-voltage power distribution network. The method includes the following steps that: 101, the static model and the operating data of the low-voltage power distribution network are obtained; 102, network topology construction and state estimation are carried out according to the static model and the operating data of the low-voltage power distribution network; 103, a network real-time model is constructed according to network topology and state estimation; 104, the operating state of the low-voltage power distribution network is analyzed according to the network real-time model; 105, whether the operating state of the low-voltage power distribution network meets a preset condition is determined; 106, when it is determined that the operating state of the low-voltage power distribution network meets the preset condition, the operating state of the low-voltage power distribution network is optimized; and 107, the steps from 101 to 105 are executed circularly until the preset condition is satisfied. According to the three-phase unbalance optimization method for the low-voltage power distribution network of the invention, low-voltage line three-phase unbalance optimization and transformer district three-phase unbalance optimization are layered, active imbalance optimization and reactive power optimization are decoupled, a global optimization process is realized, and an optimization effect can be improved.

Description

technical field [0001] The invention relates to the field of low-voltage distribution networks, in particular to a three-phase unbalance optimization method for low-voltage distribution networks. Background technique [0002] The three-phase unbalance problem of the low-voltage distribution network is becoming more and more prominent, which will not only increase the line loss, but also cause power quality problems, which will have a negative impact on the stable, safe and economical operation of the low-voltage distribution network. Three-phase unbalance optimization methods currently mainly include station area mode and line mode. Among them, station area mode mainly adjusts reactive power and adds arc-suppression coils, but when compensation is made by adjusting reactive power, harmonic Wave amplification and other problems make the compensation effect not good; adding arc suppression coil can only reduce the capacitive current, but cannot solve the three-phase unbalance ...

AI Technical Summary

Problems solved by technology

[0002] The three-phase unbalance problem of the low-voltage distribution network is becoming more and more prominent, which will not only increase the line loss, but also cause power quality problems, which will have a negative impact on the stable, safe and economical operation of the low-voltage distribution network

Three-phase unbalance optimization methods currently mainly include station area mode and line mode. Among them, station area mode mainly adjusts reactive power and adds arc-suppression coils, but when compensation is made by adjusting reactive power, harmonic Wave amplification and other problems make the compensation effect not good; adding arc suppression coil can only reduce the capacitive current, but cannot solve the three-phase unbalance problem, and even increase the three-phase unbalance degree; the line mode mainly passes through the station area Intelligent terminal and line automatic phase change switch mode, line automatic phase change switch collects node data, gathers it to the station area intelligent terminal, and the station area intelligent terminal optimizes decision-making, and sends control instructions to the line automatic phase change switch, line automatic phase change switch According to the phase change of the control command, the three-phase unbalance optimization of the low-voltage distribution network is realized, but the operation cycle of the line automatic phase change switch is 1-5 seconds, or even longer, causing the user to lose power, so it can only be carried out under the condition of a long cycle load commutation and three-phase unbalance optimization

Moreover, both the station area mode and the line mode are widely used in the low-voltage distribution network at present, but the two are independent of each other, lack of overall overall optimization, and are prone to unfavorable phenomena such as equipment operation vibration and poor optimization effect

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