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

A power system and frequency deviation technology, applied in the field of determining the frequency deviation of the power system for frequency regulation of new energy, can solve the influence of the calculation of the steady-state frequency of the new energy power generation, the proportion of the new energy power generation is more stable, and the new energy is not considered. Participate in system impact and other issues to achieve the effect of simplifying analysis and calculation difficulty, high engineering applicability, and ensuring safety

Active Publication Date: 2020-03-17
CHINA ELECTRIC POWER RES INST +2
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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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[0056] Exemplary embodiments of the present invention will now be described with reference to the drawings; however, the present invention may be embodied in many different forms and are not limited to the embodiments described herein, which are provided for the purpose of exhaustively and completely disclosing the present invention. invention and fully convey the scope of the invention to those skilled in the art. The terms used in the exemplary embodiments shown in the drawings do not limit the present invention. In the figures, the same units / elements are given the same reference numerals.

[0057] Unless otherwise specified, the terms (including scientific and technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it can be understood that terms defined by commonly used dictionaries should be understood to have consistent meanings in the context of their related fields, and should not be understood as idealized or over...

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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...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/48H02J3/24
CPCH02J3/48H02J3/24
Inventor 汪梦军马士聪王铁柱张曦曾思成郭剑波赵兵王姗姗王天昊于光耀崇志强
Owner CHINA ELECTRIC POWER RES INST
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