A method for suppressing voltage fluctuations in distribution network beyond limits based on flexible multi-state switches

Abstract

The invention discloses a power distribution network voltage fluctuation out-of-limit inhibition method based on a flexible multi-state switch. The power distribution network voltage fluctuation out-of-limit inhibition method comprises the following steps: firstly, obtaining two intersecting shafts and the values of direct-axis components through static / rotary coordinate transformation by measuring the three-phase alternating current voltage of each port of the flexible multi-state switch, and then obtaining the resultant vector amplitude of the three-phase voltage of each port to obtain the average value of the voltage amplitude of each port as a regulated and control value of voltage; then, applying disturbance on the active power of the flexible multi-state switch, and obtaining the sensitivity of the voltage of each port of the flexible multi-state switch on active power according to a perturbation and observation method; and finally, obtaining an active power command of each portaccording to the regulated and control value of voltage and the sensitivity, and adjusting the active power of each port to reach the purpose of inhibiting voltage fluctuation out-of-limit. Based on the existing working mode of the flexible multi-state switch, the voltage fluctuation out-of-limit inhibition of a power distribution network is realized, and the power distribution network absorptivecapacity of a distribution power supply is promoted.

Description

Technical field [0001] The invention belongs to the field of smart grids, and more specifically, relates to a method for suppressing over-limit voltage fluctuations of a distribution network based on a flexible multi-state switch. Background technique [0002] Against the background of ever-decreasing fossil fuel reserves and more serious environmental pollution problems, wind and solar energy and other clean and renewable energy sources are being used more and more widely. In the distribution network, distributed photovoltaic power generation systems can be installed on the roofs of corporate buildings and residents. Wind power generation systems can be configured in open areas with rich wind resources. After photovoltaic and wind power generation systems are connected to the grid, they can supply power to the load. [0003] The volatility, randomness, and intermittent nature of renewable energy sources such as wind power and photovoltaics will cause the grid voltage to fluctuate ...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the above defects or improvement needs of the prior art, the present invention provides a method for suppressing voltage fluctuations in a distribution network based on a flexible multi-state switch, thereby solving the problem that the response speed of a conventional switch is difficult Technical Problems in Responding to Sudden Changes in Output of Distributed Power Generation Systems

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