A method to improve the steady-state operating range of power springs

Abstract

The invention discloses a method for improving a steady-state operating range of an electric power spring. The method comprises the steps of calculating a steady-state grid-side voltage representation vector according to an electric power system network topology and electrical parameters corresponding to the electric power spring, and drawing a vector track curve; obtaining a steady-state operating track and range of the electric power system through analysis by a geometric method according to the steady-state grid-side voltage vector track; obtaining a system optimal control track under the grid-side voltage out-of-limit condition according to the steady-state grid-side voltage vector track by combination with the geometric method; and obtaining an optimization calculation method for the expanded steady-state operating range of the electric power spring and the key load voltage set values of the electric power system in the grid-side voltage non-out-of-limit condition and the grid-side voltage out-of-limit condition. By adoption of the method, the problem of failure of the electric power spring in the grid-side voltage out-of-limit condition can be effectively avoided, so that the steady-state operating range of the electric power spring is expanded, and the safety and stability operation performance of the electric power spring system are obviously improved.

Description

technical field [0001] The invention belongs to the technical field of smart grid control and relates to a method for improving the steady-state operating range of an electric spring. Background technique [0002] With the large-scale grid connection of renewable energy such as wind energy and solar energy, the intermittent, unstable, and low prediction accuracy of renewable energy power generation has caused the imbalance between power generation and load demand to become increasingly prominent, affecting the power system. Operational safety and power quality of power supply. [0003] Solving a series of problems caused by renewable energy grid integration through demand-side management has been widely recognized in the industry. However, ordinary demand-side technologies generally require end-user participation, or at the expense of user experience, and energy storage-based technologies face high costs. . In response to the above situation, the University of Hong Kong pr...

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Problems solved by technology

[0005] However, like mechanical springs, electric springs also operate in a limited range, which is limited by factors such as DC link voltage, critical load and non-critical load operating voltage range, network element parameters, etc.

When the grid-side voltage fluctuates too much, the electric spring will not be able to complete the control target and fail

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