Multi-power distribution converter coordination control method based on flexible interconnection low-voltage power distribution network

Abstract

The invention discloses a multi-power distribution converter coordination control method based on a flexible interconnection low-voltage power distribution network. The method comprises the steps: enabling a power distribution network feeder line or a power distribution sub-network to be flexibly interconnected through a common DC bus and a VSC, and constructing a flexible interconnection power distribution network frame; analyzing the relationship between the terminal voltage and the active power and the reactive power, interactively adjusting the terminal voltage of the alternating current line by controlling the active power of each VSC in the grid, and establishing a voltage-active power operation droop curve of the low-voltage distribution line; acquiring local voltage information at the terminal of an alternating-current side line, acquiring the operation condition of each line, transmitting the voltage at the terminal of the alternating-current line through a common direct-current bus, and completing transmission and sensing of voltage load information of different distribution lines; and according to the operation droop curve, controlling power interaction of each line, and balancing load distribution of different feeder lines of the power distribution network. According to the invention, complementation and mutual assistance of power between feeder lines of the low-voltage power distribution network are realized, and the voltage quality of the terminal of each power distribution line is improved.

Description

technical field [0001] The invention relates to the technical field of power electronics technology and automatic control in a power system, in particular to a coordinated control method for multi-distribution converters based on a flexible interconnected low-voltage distribution network. Background technique [0002] With the innovation and changes in the field of energy and power, the limitations of the traditional distribution network have become increasingly prominent, and the challenges it faces have become increasingly severe. Among them, the main problems include: large-scale integration of distributed renewable energy into the power grid, two-way flow of power in the distribution network, unbalanced loads between feeders, and out-of-limit node voltages; diversification of load types, and the structure and operation mode of the traditional distribution network cannot Meet the needs of various flexible loads; users have higher requirements for power supply reliability ...

AI Technical Summary

Problems solved by technology

Among them, the main problems include: large-scale integration of distributed renewable energy into the power grid, two-way flow of power in the distribution network, unbalanced loads between feeders, and out-of-limit node voltages; diversification of load types, and the structure and operation mode of the traditional distribution network cannot Meet the needs of various flexible loads; users have higher requirements for power supply reliability and power quality

However, due to factors such as the structure of the communication network itself and the characteristics of the medium, the communication signal noise interference of the low-voltage distribution network is strong, and the signal attenuation is large, and there are many problems at present.

Images