Virtual prime mover output power adjusting method based on photovoltaic power supply

Abstract

The invention relates to a virtual prime mover output power adjusting method based on a photovoltaic power supply. The virtual prime mover output power adjusting method comprises steps that by adopting an advanced perturbation observation method, a required photovoltaic power supply output power point is searched, and by adopting a control strategy of a photovoltaic power supply side DC / DC converter, power required by the photovoltaic power supply is output. By breaking an application limitation of a conventional virtual synchronous generator technology, a photovoltaic power generation technology is integrated with a virtual synchronous generator technology, and the dynamic characteristic of the photovoltaic power supply and the output power characteristic of the prime mover of the synchronous generator are fully considered. By adopting the improved perturbation observation method, the up-down adjustment of the output power of the photovoltaic power supply is realized, and the function of the photovoltaic power supply being used as the virtual prime mover is fully used, and then the virtual synchronous generator is capable of carrying forward the excellent performance of the conventional synchronous generator, and at the same time, an energy storage device is only required to provide inertia, and system power notch is not required to be compensated, and therefore required energy storage capacity is small, and costs are greatly saved. The virtual prime mover output power adjusting method has advantages of good development potential and popularization space.

Description

technical field [0001] The invention belongs to the field of power electronics, and relates to a method for adjusting the output power of a virtual prime mover based on a photovoltaic power source, in particular to an improved disturbance observation method. Background technique [0002] Due to comprehensive considerations of economy, technology and environment, renewable energy sources such as wind energy and solar energy are gradually being widely used. However, with the access of more and more distributed power sources, the power system is also under unprecedented challenges in terms of energy security and economic benefits. The concept of micro-grid has solved some problems of distributed power access to distribution network to a certain extent. However, large-scale distributed power is connected to the grid through inverters. Due to the lack of inertia and damping, the rotation reserve capacity and moment of inertia of the grid are relatively reduced, which affects the...

AI Technical Summary

Problems solved by technology

In the prior art, a photovoltaic virtual synchronous machine and its control strategy considering the dynamic characteristics of the photovoltaic power supply are proposed. By designing an additional control strategy for the photovoltaic power supply, it is ensured that the maximum available power of the photovoltaic power supply will not cause a DC voltage drop. However, the control strategy The lower photovoltaic power supply does not really realize the function of the virtual prime mover, and its output power can only be lowered

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