A Three-phase Unbalanced Reactive Power Voltage Control Method Considering the Negative Sequence Voltage of the System

Abstract

The invention discloses a three-phase imbalance reactive voltage control method metering system negative sequence voltage, and belongs to the technical field of electric system operation and control. The method particularly includes the following steps that 1, a target function metering the system negative sequence voltage and network loss is set up; 2, a node power equation, in a rectangular coordinate system, of a three-phase imbalance power distribution network is set up; 3, safe operation constraint of the three-phase imbalance power distribution network is set up; 4, control variable constraint of the three-phase imbalance power distribution network is set up; 5, a branch-and-bound algorithm combined with a quadratically constrained quadratic programming algorithm is used for solving. The three-phase imbalance reactive voltage control method metering the system negative sequence voltage is set up, the system negative sequence voltage can be reduced while network loss of the three-phase imbalance power distribution network is reduced by means of coordinated optimization between various reactive compensation devices and a distributed power source, and the three-phase imbalance problem of the power distribution system is solved.

Description

technical field [0001] The invention relates to the technical field of power system operation and control, in particular to a three-phase unbalanced reactive voltage control method taking into account the negative sequence voltage of the system. Background technique [0002] The increasing environmental pollution and the depletion of traditional fossil fuels have driven the rapid development of active distribution networks that can realize grid-connected operation and control of renewable energy. However, there are a large number of controllable resources in the active distribution network, which are used to improve energy utilization and reduce network loss, making the coordinated optimization control among the control devices of the distribution network a new challenge. Since the distribution network mostly contains single-phase / two-phase and three-phase asymmetric loads, and the asymmetry of three-phase line parameters is common, with the access of a large number of singl...

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Problems solved by technology

However, only discrete control variables such as whether the shunt capacitor is connected (take 0 or 1), transformer tap position, and network reconfiguration switch are considered, and the coordination and optimization between various reactive power compensation devices and distributed power sources are not considered.

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