A method and system for dynamic optimization of system frequency based on grid-connected converter

Abstract

The invention discloses a dynamic optimization method and system for the system frequency based on a grid-connected converter. The method comprises the steps of acquiring related indexes of the systemfrequency; processing the related indexes of the system frequency to obtain a frequency correction signal; adding the frequency correction signal to a reactive power branch of the grid-connected converter, maintaining the angle between a current rotation vector and a voltage rotation vector output by an equivalent current source of the grid-connected converter, suppressing the change of the system frequency, and optimizing the dynamic process of the system frequency. The system comprises a system frequency correction signal generation module and a system frequency response optimization module, wherein the system frequency correction signal generation module is used for constructing the frequency correction signal by using the related indexes of the system frequency; and the system frequency response optimization module is used for optimizing the dynamic process of the system frequency by using the additional frequency correction signal. The dynamic optimization method can improve thedynamic process of the frequency when the system is subjected to great load disturbance or fault without increasing the reserve capacity of the system through adding the frequency correction signal tothe reactive power branch of the grid-connected converter, and the frequency dynamic regulation ability is good.

Description

technical field [0001] The invention belongs to the field of power system frequency stability control, and more specifically relates to a method and system for dynamically optimizing system frequency based on a grid-connected converter. Background technique [0002] In order to promote energy transformation and increase the proportion of non-fossil energy consumption, my country's new energy power generation, such as wind power, photovoltaic power generation and biomass power generation, is achieving rapid development. The proportion of wind power installed capacity in my country's "Three Norths" region has reached a relatively high level, and has a considerable scale. With the massive access of power electronic conversion equipment such as wind turbines, photovoltaic power generation, and direct current transmission, the modern power system is ushering in the transformation of power electronics. [0003] The frequency dynamic problem refers to whether the system frequency ...

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Problems solved by technology

[0005] In view of the defects of the prior art, the purpose of the present invention is to provide a system frequency dynamic optimization method and system based on grid-connected converters, aiming to solve the problem that the existing active branch circuit’s additional control method has limited ability to dynamically adjust the frequency

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