Power decoupling method of virtual synchronous generator based on single rotation angle virtual power

Abstract

The invention relates to a power decoupling method of a virtual synchronous generator based on a virtual power of a single rotation angle. Since a fixed rotation angle is used in the virtual power conversion, it is not necessary to consider the impedance angle of the output impedance of the inverter. The sensitivity is small, the design is simple, and it is easy to implement; the inherent inertia structure in the virtual synchronous generator algorithm is used to solve the weak decoupling problem caused by the fixed rotation angle, which ensures the dynamic and static stability of the system; the present invention has high control precision, With good tracking effect, it can effectively suppress power oscillation and provide damping support for the power grid. It is suitable for new energy grid-connected systems such as solar power and wind power to be connected to medium and low voltage micro-grids. This method can weaken the coupling degree of the output power of the inverter when the system is connected to the medium and low voltage microgrid, thereby suppressing the oscillation of the output power, improving the dynamic and static stability of the entire inverter system, and ensuring its safe and reliable operation.

Description

technical field [0001] The invention relates to an inverter control technology, in particular to a power decoupling method of a virtual synchronous generator based on virtual power of a single rotation angle. Background technique [0002] Grid-connected inverters have been widely used as the interface between distributed power generation and the grid. Since power electronic equipment cannot provide the required inertia and damping for the grid, with the continuous improvement of the penetration rate of distributed power generation, the power grid The inertia and damping are seriously insufficient, and the stability is reduced. Virtual synchronous generator technology simulates the operating characteristics of synchronous generators, provides inertia and damping for the grid, and becomes an effective way to solve this problem. [0003] Virtual synchronous generator technology imitates the characteristics of primary frequency regulation and primary voltage regulation of synch...

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the problem of power oscillation caused by the power coupling of the output power of the virtual synchronous generator during line transmission, and proposes a power decoupling method of the virtual synchronous generator based on the virtual power of a single rotation angle. It can weaken the coupling degree of the output power of the inverter when the system is connected to the medium and low voltage microgrid, thereby suppressing the oscillation of the output power, improving the dynamic and static stability of the entire inverter system, and ensuring its safe and reliable operation

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