Method and system for determining frequency deviation of new energy frequency-modulated power system

Abstract

The invention discloses a method and system for determining frequency deviation of a new energy frequency-modulated power system, and belongs to the technical field of power system operation control.The method comprises the following steps: establishing a new energy generator single-machine model and a synchronous generator single-machine model according to a new energy power system; determininga new energy proportion according to the power injected into the bus by the new energy generator single-machine model, the electromagnetic power injected into the bus by the synchronous generator single-machine model and the electromagnetic power absorbed by the power system load; determining the unbalanced power which can be balanced by the new energy single-machine model; determining the adjustment power of the balanced and unbalanced power required to be provided by the synchronous generator single-machine model; and determining frequency deviation after power fluctuation of the power system. The method and system can simplify the analysis and calculation difficulty while guaranteeing the accuracy of a calculation result, is higher in engineering applicability, and can effectively guarantee the safe and stable operation of a power grid.

Description

technical field [0001] The present invention relates to the technical field of power system operation control, and more specifically, to a method and system for determining the frequency deviation of a power system for new energy frequency modulation. Background technique [0002] The energy crisis has made people pay more and more attention to the research and utilization of new energy, and new energy power generation is the main way to use new energy. The new energy generator set is different from the traditional synchronous generator set. Due to the addition of the converter control link, the electromechanical decoupling has been realized, and its stability characteristics have changed. The proportion of new energy power generation in China is gradually increasing and will continue to increase. After large-scale new energy power generation replaces traditional synchronous unit power generation, it will cause changes in the frequency stability characteristics of the power...

AI Technical Summary

Problems solved by technology

At present, there are methods to realize the fast calculation of the steady-state frequency of the power system after the disturbance, but none of the existing methods considers the impact of the access of new energy power generation on the calculation of the steady-state frequency, nor does it consider the impact of new energy on the steady-state frequency modulation of the system. The influence of frequency calculation cannot cope with and solve the practical problems that the proportion of new energy power generation in my country is increasing and the frequency stability is becoming more and more prominent

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