Control method and device for improving electromechanical stability of new energy power grid

Abstract

The invention provides a control method and device for improving the electromechanical stability of a new energy power grid. The method comprises the steps of determining the total current instructionvalue of an energy storage system in the new energy power grid according to the rotating speeds of the head end and the tail end of a wind driven generator unit shafting in the new energy power grid;and controlling an energy storage system in the new energy power grid to suppress electromechanical oscillation of the new energy power grid by using the total current instruction value. According tothe invention, the energy storage system is additionally arranged on a centralized outgoing line of a large-scale new energy field station; the additional control of the energy storage system is usedfor assisting in improving the inertia level of an electric power system containing high-proportion new energy, and the inertia effect and electromechanical stability of the electric power system areremarkably enhanced under the condition that the maximum power output capacity of a new energy power station is not affected.

Description

technical field [0001] The invention belongs to the technical field of energy storage assisting in improving the stability of a new energy power system, and in particular relates to a control method and device for improving the electromechanical stability of a new energy grid. Background technique [0002] In recent years, new energy represented by wind power and photovoltaic has developed rapidly, and its proportion in the power grid has increased sharply. At the same time, grid-connected inverters characterized by low inertia and weak damping are also connected to the public grid on a large scale, and the installed ratio of traditional rotary synchronous generators is correspondingly reduced, resulting in the maintenance of electromechanical stability of the grid. The rotating reserve capacity and moment of inertia are relatively reduced, and the electromechanical stability of the new energy power system is reduced; Strong random volatility and other characteristics, larg...

AI Technical Summary

Problems solved by technology

The scope and suppression ability of traditional measures to suppress electromechanical oscillations in the power grid are limited; and, unlike reactive power sources that can be installed in the best position, new energy sources such as wind power and photovoltaics are limited by the installation position and cannot be in the best position for oscillation suppression , the new energy active power control at this time will inevitably affect the maximum power tracking capability, resulting in a reduction in power generation

Images