A dynamic adaptive droop control method for DC microgrid

Abstract

The invention discloses a dynamic self-adaptive droop control method for a DC microgrid, relates to the control operation technology of a DC distribution network, and belongs to the technical field of power generation, transformation or distribution. Aiming at the problem that the traditional droop control is difficult to optimize the load distribution accuracy and the bus voltage adjustment rate simultaneously when multiple distributed power modules are running in parallel, firstly, the droop coefficient of the converter is obtained by calculating the iterative calculation of the current deviation, and the calculated current deviation converges to the maximum allowable Load current deviation, the external characteristic curves of different converters tend to be consistent; then adjust the droop coefficient in combination with the actual current deviation to reduce the calculation error caused by external factors such as sensor accuracy, and achieve load balancing when the bus voltage drop is small. The invention has a simple iterative process and principle, and has the advantages of small bus voltage drop, greatly improved current sharing accuracy and no influence from line impedance changes.

Description

technical field [0001] The invention discloses a dynamic self-adaptive droop control method for a direct current distribution network, relates to the control operation technology of a direct current distribution network, and belongs to the technical field of power generation, transformation or distribution. Background technique [0002] With the large-scale grid-connection of distributed renewable energy and the increase of industrial loads, DC data centers, DC charging piles and LED lighting systems, the traditional grid structure, power equipment and coordinated operation strategies are difficult to meet the stability requirements. For the DC microgrid, because there is no need to consider power quality issues such as reactive power and skin effect, the bus voltage stability and the load distribution balance of each distributed power supply are the main concerns. [0003] Due to the different line impedances between the distributed power sources and the DC bus in the DC mi...

AI Technical Summary

Problems solved by technology

Through positive and negative iterations with simple calculation and fast response, the load distribution accuracy, bus voltage adjustment rate and system stability are greatly improved, and the technical problem that the traditional droop control load is difficult to adjust the current sharing accuracy and bus voltage adjustment rate at the same time is solved.

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