Secondary voltage regulation method suitable for DC microgrid

Abstract

The invention discloses a secondary voltage regulation method suitable for a DC microgrid. The method comprises the following steps: determining a DC bus voltage regulation amount to be undertaken byeach power unit according to a DC bus voltage offset and a voltage regulation coefficient; updating the voltage reference value of droop control through the DC bus voltage regulation amount and the voltage sensitivity of each unit so as to quickly and accurately restore the DC bus voltage to the target value; and setting the current distribution coefficient on the basis according to the system operation requirements and redistributing the load among micro-sources so that the output current of each converter meets the operation requirements. The technical scheme can realize accurate control ofthe DC bus voltage; the load distribution can be performed according to the system operation requirements and the distribution result is not limited by the matching degree of line impedance and droopcoefficient and thus the flexibility of microgrid system operation can be improved; meanwhile, the droop coefficient is allowed to be adjusted within a large range, thus improving the stability of themicrogrid system operation.

Description

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AI Technical Summary

Benefits of technology

This new technology helps regulate the amount of electricity supplied from an AC (Alternating Current) generator connected through one or more small electrical devices called generators that are located near each other on different levels within a building's structure. By controlling both the frequency and amplitude of voltages applied across these converters, this technology enables accurate control over how much energy needs to produce during peak hours while also allowing it to supply enough at night time without exceeding its maximum allowed production capabilities. Overall, this innovation improves efficiency and performance of the entire microsystem.

Problems solved by technology

This patents discusses how conventional methods for controlling electricity grids such as alternating current (A/C), direct current (DC)-based systems suffer from issues like instability caused by negative feedback loops that limit their ability to adjust the amount of active power provided based on changing environmental factors. Different techniques aimed towards improving these aspects include drooped control policies, improved DC bus technology, advanced converters, and more efficient regulation schemes.

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