Virtual inertia compensation method for optical storage combined power generation system based on active support control

Abstract

The invention belongs to the technical field of optical storage combined power generation system virtual inertia compensation, and relates to a virtual inertia compensation method for an optical storage combined power generation system based on active support control. The method comprises: modeling a photovoltaic power generation system, analyzing the virtual inertia of the optical storage combined power generation system, and including inertia analysis of a photovoltaic-energy storage system. The active support control strategy based on the standard three-order model of the synchronous machine is adopted for the photovoltaic power generation unit, the port characteristics of the synchronous generator are better simulated, necessary inertia and damping are provided for the system, the voltage stability support capacity and the frequency stability support capacity of the system after photovoltaic grid connection are improved, and the robustness of the system is effectively improved. According to the invention, the low-frequency oscillation suppression capability of the photovoltaic-energy storage combined system can be enhanced, the system stability is improved, and the new energy photovoltaic absorption capability of the power grid is further promoted.

Description

technical field [0001] The invention belongs to the technical field of virtual inertia compensation of an optical-storage combined power generation system, and relates to a virtual inertia compensation method for an optical-storage combined power generation system based on active support control. Background technique [0002] With the development of the world economy and the sharp increase in energy demand, the development and utilization of sustainable clean energy has gradually become an important energy development strategy for countries all over the world. In recent years, photovoltaic power generation has become increasingly be valued. At present, there are two main forms of photovoltaic power generation. First, photovoltaic systems are installed in residential areas as a distributed power source, and are directly generated and consumed on the user side. This form has been widely practiced abroad, and it is often used in remote areas in my country, such as Power supply ...

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Problems solved by technology

[0011] Literature [1-2] conducts research on supercapacitors to smooth power output and improve the frequency regulation of wind power generation and PV power generation based on DFIG. Literature [3] proposes the concept of generating virtual inertia by controlling new energy grid-connected inverters , Literature [4-5] researched and analyzed from the perspectives of modeling, coordinated control and power oscillation of the photovoltaic-storage combined power generation system, but none of the above studies were conducted from the perspective of virtual inertia compensation of the photovoltaic-storage combined power generation system. The present invention A method of virtual inertia compensation for the combined solar-storage power generation system is proposed, which increases the overall inertia level of the combined solar-storage power generation system, increases its ability to stably support the system frequency, and improves the robustness of the system

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