Secondary Frequency Modulation Control Method of Virtual Synchronous Generator Based on Backstepping Sliding Mode Control

Abstract

The invention relates to a secondary frequency modulation control method of a virtual synchronous generator based on backstepping sliding mode control. When power or frequency fluctuations occur in the system, the measured frequency deviation value Δω is judged. If it is within the specified allowable range k, then Carry out backstepping sliding mode control to adjust the frequency until the frequency recovery ends; if the frequency deviation exceeds the specified allowable range k, switch to the energy storage unit for secondary frequency modulation, and continuously measure the frequency deviation; when the measured deviation returns to Within the specified allowable range k, the energy storage exits and returns to the backstepping sliding mode controller to adjust the frequency. The frequency regulation of the system can be carried out under the consideration of uncertain factors of external disturbance and parameter perturbation, and the utilization rate of the energy storage unit can be guaranteed while performing secondary frequency regulation when a large load disturbance occurs in the system. It can effectively suppress the frequency limit when there is a large load disturbance, so that the frequency can be quickly restored, and the energy storage function can be fully exerted by combining the primary and secondary frequency regulation in the entire frequency regulation range.

Description

Secondary Frequency Modulation Control Method of Virtual Synchronous Generator Based on Backstep Sliding Mode Control technical field The present invention relates to a kind of virtual synchronous generator control technology, particularly a kind of virtual synchronous generator based on backstep sliding mode control A method for secondary frequency modulation control of a quasi-synchronous generator. Background technique [0002] With the impact of energy crisis and environmental pollution, the development of new energy power generation has driven the development of distributed power generation, Microgrids also appeared. As an important interface between the two, the inverter acts as a hub, so the inverter controls the The choice will directly affect the operation and stability of the microgrid. However, as a power electronic device, it cannot provide sufficient power for the power system. With sufficient inertia support and damping, with the continuous increase of ...

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Problems solved by technology

[0004] The present invention is aimed at the problem of virtual synchronous generator adapting to system operation and ensuring frequency stability, and proposes a virtual synchronous generator secondary frequency modulation control method based on backstepping sliding mode control, which can consider external disturbances and parameter perturbations. Adjust the frequency of the system when the factors are determined, and perform secondary frequency adjustment when the system has a large load disturbance while ensuring the utilization of the energy storage unit

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