Robust Control Method for Secondary Frequency Modulation of Virtual Synchronous Generator

Abstract

The invention relates to a secondary frequency modulation robust control method for a virtual synchronous generator. The method comprises the steps: carrying out the adaptive optimization of the parameters of a virtual controller designed through reverse control and uncertain items existing in a system through a grey wolf algorithm when the system generates smaller power or frequency fluctuation;when large power or frequency fluctuation happens to the system and exceeds the frequency fluctuation allowable range, automatically switching on the energy storage unit for secondary frequency modulation, and continuously optimizing the parameters; when the frequency deviation of the system is recovered to an allowable range, enabling the energy storage unit to exit, and performing the self-adaptive backstepping control to continue the adjustment until the frequency is recovered and the frequency modulation is finished. According to the invention, the frequency modulation can be performed onthe system under the condition of considering uncertain items and parameter perturbation, and the utilization rate of the energy storage unit is ensured while secondary frequency modulation is performed when large-load disturbance occurs in the system.

Description

Technical field [0001] The present invention relates to a virtual synchronous generator control technology, and more particularly to a secondary frequency modulous and push-push-to-peer control method based on a gray wolf optimization. Background technique [0002] With the development of new energy power generation, the proportion of distributed power generation increases, and the microgrid is proposed. The inverter acts as an important interface between the two, and the inverter control will directly affect the operation and stability of the microgrid. However, as a power electronics, due to its own characteristics of inertia and damping, it is easy to impact the system. [0003] Virtual Synchronous Generator, VSG) Control is to provide inertial support for the system through analog synchronous generator mathematical model, but at the same time, due to the first-order system upgrade to a second-order system, there is a nonlinear term in its nonlinear system. , Parameter test an...

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the problem of adapting the virtual synchronous generator to the system operation and ensuring frequency stability, and proposes a robust control method for the secondary frequency modulation of the virtual synchronous generator, which can control the system under the condition of considering uncertain items and parameter perturbations Frequency regulation, and when there is a large load disturbance in the system, perform secondary frequency regulation while ensuring the utilization of the energy storage unit

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