Power decoupling control method and system for virtual synchronous generator based on voltage feedforward compensation

Abstract

The invention belongs to the technical field of power electronic device control, and relates to a power decoupling control method and system for a virtual synchronous generator based on voltage feedforward compensation. The method comprises the steps of firstly, acquiring output power Pvsg and Qvsg of the virtual synchronous generator; giving a reactive power reference value Qref, subtracting thereactive power Qvsg output by the virtual synchronous generator from the reactive power reference value Qref to obtain d-axis initial reference voltage V<d><ref'> through an inertia equation of a reactive power loop, setting the q-axis initial reference voltage V<q><ref'> to be 0 at the same time, then presetting voltage feedforward equivalent inductive reactance Xv, and generating feedforward voltage Xviod; and obtaining a voltage control loop reference instruction V<d><ref> according to the d-axis initial reference voltage V<d><ref'>, subtracting the feedforward voltage Xviod from the q-axisinitial reference voltage V<q><ref'> to obtain a voltage control loop reference instruction V<q><ref>, and finally generating an SVPWM control instruction through a voltage control loop and a currentcontrol loop according to the voltage control loop reference instruction. According to the invention, the coupling problem between active power output and reactive power output is significantly improved, and the capacity requirement of the inverter is reduced.

Description

Technical field [0001] The invention belongs to the technical field of power electronic device control, and more specifically, relates to a virtual synchronous generator power decoupling control method and system based on voltage feedforward compensation. Background technique [0002] With the gradual depletion of fossil energy, distributed energy such as wind and solar energy has received extensive attention. In recent years, large-scale new energy power stations with power electronic converters as the interface have been established in China, which has reduced the inertia of the power system and adversely affected the stable operation of the power grid. Traditional synchronous motors have the advantage of being naturally friendly to the power grid, and their moment of inertia and damping characteristics play an important role in maintaining the stable operation of the power grid. Based on this, scholars put forward the concept of virtual synchronous generator, which can realiz...

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Problems solved by technology

[0005] Aiming at the problem that the power coupling of virtual synchronous generator will affect the control accuracy, dynamic response and system stability of its output power in the prior art, a power decoupling control method of virtual synchronous generator based on voltage feed-forward compensation is proposed and The system significantly improves the coupling problem between the active power loop and the reactive power loop, alleviates the reactive power shortage of the grid, and reduces the capacity demand for the inverter

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