Novel topology of electric spring and control method of novel topology

Abstract

The invention discloses a novel topology of an electric spring and a control method of the novel topology. Along with increase of grid connection capacity of renewable energy power generation of wind energy, solar energy and the like, the stability of a power system faces a severe test; and when large-scale distributed grid connection of renewable energy power generation is carried out, the probability that a power grid, particularly a micro grid is broken down is gradually increased, so that the electric spring is provided primarily aiming at the instability of renewable energy power generation in the micro grid. According to the novel electric spring topology structure and control strategy provided by the invention, the stability of critical load voltage can be ensured; fluctuation of input voltage can be transferred to non-critical load; and the condition that the energy consumption of the non-critical load is kept in accordance with the change trend of the input voltage can also be ensured. The monotonous change relationship between the active power and the input voltage realized by the novel topology cannot be realized by an existing electric spring, so that the novel topology of the electric spring has relatively high practicality when the amplitude of the voltage increases along with increase of generation power.

Description

technical field [0001] The invention belongs to the technical field of smart grid control, and relates to a new topology of an electric spring and a control method thereof. Background technique [0002] At present, the operation mode of the power system is still that the demand determines the power supply, which requires the power supply side to accurately predict the user's demand. Renewable energy such as wind energy has the disadvantages of intermittency and instability. With the increase of its grid-connected capacity year by year, its impact on the power system is becoming more and more obvious, making the above prediction more difficult. For the intermittent problem of wind energy, using energy storage devices such as batteries, superconductors or high-speed flywheels to offset the mismatch between power generation and demand is one of the effective solutions. However, these energy storage devices add significant cost, and reliable operation of the energy storage devi...

AI Technical Summary

Problems solved by technology

For example, in the case where the amplitude of the voltage increases with the increase of the generated power, the current ES cannot function

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