Flexible multi-mode switch-based three-phase imbalance reactive voltage control method

Abstract

The invention discloses a flexible multi-mode switch-based three-phase imbalance reactive voltage control method. The method is characterized by comprising the steps of: determining parameters of a selected power distribution system according to the power distribution system; determining target functions such as minimum active loss and minimum negative sequence voltage of the power distribution system by adoption of a linear weighted sum method; selecting a reference node of the system and establishing a node power equation of a three-phase imbalance power distribution network under a rectangular coordinate system according to a node voltage method; establishing a state variable constraint and a control variable constraint of the three-phase imbalance power distribution network according to an electric system safe operation requirement; and carrying out solution by adoption of branch and bound and a secondary constraint secondary planning algorithm. According to the method, a system negative sequence voltage-considered three-phase imbalance reactive voltage control method is established, and through coordination control between a flexible multi-mode switch and a distributed power supply is utilized to decrease the negative sequence voltage of the system while reducing the network loss of the three-phase imbalance power distribution network, thereby improving the three-phase imbalance problem of the power distribution system.

Description

technical field [0001] The invention relates to a three-phase unbalanced reactive voltage control method, in particular to a three-phase unbalanced reactive voltage control method based on a flexible multi-state switch. Background technique [0002] Facing the requirements of distributed power consumption, power quality improvement, operation optimization and self-healing control in smart distribution network, traditional control methods have shown obvious deficiencies, and flexible multi-state switches provide a new solution. The flexible multi-state switch is a power electronic device installed at the traditional tie switch. It can accurately control the active and reactive power of the feeders on both sides of the connection. The introduction of the flexible multi-state switch has completely changed the power supply mode of the traditional closed-loop design and open-loop operation of the distribution network, avoided the safety hazard caused by the switch displacement, a...

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Problems solved by technology

[0004] However, so far, the application of flexible multi-state switch devices in distribution networks is still less, and there is no relevant report on the application of multi-port flexible multi-state switches to solve the unbalanced reactive power and voltage control of active distribution networks.

Most studies have only carried out some economic analysis of flexible multi-state switches in distribution networks, and in-depth research on the modeling and analysis of flexible multi-state switches and the realization of control strategy functions has yet to be carried out.

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