Power flow control method for flexible multi-state switch connected to distributed power supply

Abstract

The invention discloses a power flow control method of a flexible multi-state switch connected to a distributed power supply. The method comprises the following steps: 1, constructing a power model ofthe flexible multi-state switch connected to the distributed power supply and a mathematical model of a voltage source type converter of each port; 2, calculating the load rate of each feeder line before the flexible multi-state switch is accessed and the load rate required to be balanced after the flexible multi-state switch is accessed, and deriving the active power adjusted by the connected flexible multi-state switch port voltage source type converter; 3, calculating the input active power of the distributed power supply allocated to each feeder line according to the active capacity ratioof each feeder line; 4, calculating the total active power output to each feeder line by the flexible multi-state switch connected to the distributed power supply. According to the invention, the load active power imbalance among the feeder lines can be adjusted, and the active power input by the distributed power supply is optimally distributed, so the power fluctuation caused by the access of the distributed power supply to a single feeder line can be reduced, and the intermittent energy consumption level is improved.

Description

technical field [0001] The invention relates to the technical field of flexible power distribution equipment control, in particular to a power flow control method of a flexible multi-state switch connected to a distributed power supply. Background technique [0002] With the large-scale access of distributed power to the power grid, the power flow of the distribution network is becoming more and more complicated, the problem of voltage exceeding the limit is becoming more and more prominent, and the reliability of power supply and the level of power quality are reduced. In 2009, Imperial College of Technology proposed the concept of soft normally open switch to replace the tie switch or section switch in the traditional distribution network. The flexible multi-state switch is developed based on the soft normally open switch. Compared with the only on and off states of the conventional switch, the flexible multi-state switch has the characteristics of flexible power adjustmen...

AI Technical Summary

Problems solved by technology

[0003] However, there are intermittency and volatility problems in distributed power generation. Distributed power supply is directly connected to the feeder, which will cause power and voltage fluctuations to a single feeder

And due to the uncertainty of distributed power output, the feeder load rate changes frequently, and the port control setting of the flexible multi-state switch also needs to be adjusted frequently.

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