Optimal controller design for non-affine nonlinear power systems with static var compensators for hybrid UAVs

Yanchu Li,Stanimir Valtchev,Shufang Li,Qingqing Ding

doi:10.26599/tst.2020.9010058

Abstract

A generalized non-affine nonlinear power system model is presented for a single machine bus power system with a Static Var Compensator (SVC) or State Var System (SVS) for hybrid Unmanned Aerial Vehicles (UAVs). The model is constructed by differential algebraic equations on the MATLAB-Simulink platform with the programming technique of its S-Function. Combining the inverse system method and the Linear Quadratic Regulation (LQR), an optimized SVC controller is designed. The simulations under three fault conditions show that the proposed controller can effectively improve the power system transient performance.

Highlights

The use of new technologies and the consideration of cost-effectiveness have resulted in the composition of electric power systems has become increasingly complex[1]
The Static Var Compensator (SVC) or State Var System (SVS), known as the static var generator, is a reactive power electric equipment used in transmission networks[2, 3]
This operation helps ensure the balance of grid reactive power, and improves the stability and voltage quality of long-distance power transmission subjected to various interferences

Summary

Introduction

The use of new technologies and the consideration of cost-effectiveness have resulted in the composition of electric power systems has become increasingly complex[1]. As a part of flexible AC transmission systems[4, 5], the SVC is generally used to adjust the voltage, power parameters, harmonics content, and stability of systems. In long-distance power transmission systems, SVCs are installed in a line to maintain a constant voltage at the installation point by absorbing from the grid or introducing into it a continuously adjustable reactive power. This operation helps ensure the balance of grid reactive power, and improves the stability and voltage quality of long-distance power transmission subjected to various interferences. In smallsized power systems, such as those of airplanes, the effective control of energy transport is especially important

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Methods

Conclusion