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

A low-voltage distribution network and coordinated control technology, which is applied in the direction of power transmission AC network, electrical components, circuit devices, etc., can solve the problems that the distribution network operation mode cannot meet the flexible load, the signal attenuation is large, and the load between feeders is unbalanced. , to achieve the effect of improving the quality of the terminal voltage

Pending Publication Date: 2021-11-19
SHANGHAI MUNICIPAL ELECTRIC POWER CO +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Considering that in the low-voltage distribution network, the low-voltage power carrier communication often causes strong noise interference and large signal attenuation of the communication signal due to factors such as the structure of the communication network itself and the characteristics of the medium. , in this structure, the DC side of each distribution sub-network or feeder is connected to the DC bus, so as to realize the flexible interconnection of multiple distribution networks; secondly, based on this structure, the coordinated control of multi-distribution converters without communication is realized. The specific steps are as follows:

[0044] S1: Through the public DC bus and the voltage source converter (VSC), the distribution network feeder or distribution sub-network is flexibly interconnected to build a flexible interconnection distribution grid.

[0045] Among them, the equivalent circuit of a single distribution subnet and branch lines is as follows...

Embodiment 2

[0073] In order to verify the effect of this method on improving the voltage quality at the end of the low-voltage distribution network line, this embodiment designs the following calculation example for comparative analysis; the calculation example is composed of two independent low-voltage distribution lines, and the end of the feeder is connected to the user load. The two lines have different line impedances and are flexibly interconnected through the DC side.

[0074] In the calculation example, the ends of the two distribution lines of Line 1 and Line 2 are respectively equipped with 7500W active load and 7500W active power supply, the DC side voltage is controlled at 750V, and the DC load is 75Ω; The lower limits are set at 110% and 90% of the rated voltage, respectively; the line impedance of line 1 is twice that of line 2.

[0075] The control effect of this method is verified by simulation. The simulation sequence is: when t=0s, the simulation starts, the AC / DC conver...

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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 ...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/36
CPCH02J3/381H02J3/36H02J2203/20Y02E60/60
Inventor 仇成费斐李亦农李新聪夏敏浩王骏赵万剑姚伟张建文周剑桥施刚
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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