Method and device for determining optional ranges of virtual inertia and damping coefficient of VSG (Virtual Synchronous Generator)

Abstract

The invention provides a method and a device for determining optional ranges of the virtual inertia and damping coefficient of a VSG (Virtual Synchronous Generator), and relates to the technical fieldof VSGs. The method comprises the following steps: acquiring relevant parameters of a VSG grid-connected system built from a VSG to an infinite grid; establishing a state equation of the VSG grid-connected system; determining a small signal equation of the VSG grid-connected system; determining a small signal space equation of the VSG grid-connected system; determining a transfer function of theVSG grid-connected system; determining a natural oscillation frequency function and a damping ratio function of the VSG grid-connected system; and determining the optional ranges of the virtual inertia and damping coefficient of the VSG according to the natural oscillation frequency function, the damping ratio function and a preset restraining condition which is relevant to the natural oscillationfrequency function and the damping ratio function. Through adoption of the method and the device, the optional ranges of the virtual inertia and damping coefficient of the VSG can be determined accurately, so that the running of the VSG is safer and more stable.

Description

Technical field [0001] The invention relates to the technical field of virtual synchronous generators, and in particular to a method and device for determining the optional range of virtual inertia and damping coefficient of VSG. Background technique [0002] In recent years, new energy power generation technologies represented by wind power and photovoltaic power generation have developed rapidly. New energy power generation technology is mostly connected to the grid through the power electronic inverter interface, and the power electronic inverter has a fast response speed, almost no moment of inertia and damping, which will have a negative impact on the stable operation of the power system. Drawing lessons from the operating experience of traditional thermal power generating units, in new energy power generation technology, Virtual Synchronous Generator (VSG) technology is widely used. VSG technology controls power electronic inverters to enable inverter power The characteris...

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Problems solved by technology

[0004] Embodiments of the present invention provide a method and device for determining the optional range of virtual inertia and damping coefficient of VSG to solve the lack of design of virtual inertia and damping coefficient of VSG in VSG technology, which makes the current operation of VSG unsafe and dangerous. Stable Hidden Problems

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