VSC inner loop current control method based on uncertain interference estimation

Abstract

The invention discloses a VSC inner loop current control method based on uncertain interference estimation. The method comprises the following steps: S1, constructing a VSC current mathematical model of a DC power distribution network; s2, standardizing the current in the VSC current mathematical model to obtain a VSC inner loop current uncertainty dynamic model; s3, based on the VSC inner loop current uncertainty dynamic model, obtaining a VSC inner loop current reference model based on uncertainty interference estimation, an error equation based on uncertainty interference estimation and uncertainty and disturbance estimation values; and S4, according to the VSC inner loop current reference model, the error equation and the uncertainty and disturbance estimation values, calculating the control law of the VSC inner loop current. According to the method, the problem of poor anti-interference performance of the VSC inner loop current under traditional PI control can be solved, the robustness of a power grid system is improved, and the parameter setting process of the power grid system is greatly simplified.

Description

technical field [0001] The invention relates to the field of direct current distribution networks, in particular to a VSC inner loop current control method based on uncertain disturbance estimation. Background technique [0002] With the development of new energy technologies such as photovoltaics, wind power, and storage batteries, DC distribution networks have attracted more and more attention because of their flexibility and convenience for accessing various new energy sources. In the DC distribution network structure, VSC (Voltage Source Converter) is an important component responsible for rectification, so the control of VSC is very important for the stable operation of the DC distribution network system. [0003] The double-loop control consisting of the voltage outer loop and the current inner loop is a widely used traditional VSC control strategy, and the double-loop control uses the traditional synchronous coordinate system PI controller. For the inner loop current...

AI Technical Summary

Problems solved by technology

[0004] In view of this, the purpose of the present invention is to overcome the defects in the prior art, to provide a VSC inner loop current control method based on uncertain disturbance estimation, which can solve the problem of poor immunity to interference under the traditional PI control of the VSC inner loop current, and improve It improves the robustness of the grid system and greatly simplifies the parameter setting process of the grid system

Images