Title

Robust Backstepping Control of Synchronverters under Unbalanced Grid Condition

Abstract

Virtual Synchronous Generators, known as synchronverters, are inherently nonlinear systems and maintaining their consistent operation under faulty and distorted grid requires a nonlinear control design. This paper presents backstepping as an adaptive stabilizing technique which enables full power injection to the grid under unbalanced and weak conditions. The recursive structure of this methodology applied in a three-phase grid-connected inverter incorporates supplementary inner nonlinear controllers that can progressively regulate the power angle and inverter voltage as outer subsystems by using on-line backstepping update laws. Smooth active and reactive power injection during network unbalance is the target of the proposed control scheme which is successfully achieved and the stability of the system is determined via Lyapunov stability criteria. Several scenarios haven been examined through FPGA hardware cosimulation to prove the voltage fault ride-through and the pipelining scheme applied in the discretized model, enhances the capability of the controller in faster response and the robustness of the system.

Meeting Name

2019 IEEE Power and Energy Conference at Illinois, PECI 2019 (2019: Feb. 28-Mar. 1, Champaign, IL)

Department(s)

Electrical and Computer Engineering

Keywords and Phrases

Backstepping; Controllers; Electric inverters; Electric machine control; Electric power transmission networks; Stability criteria; Synchronous generators; System stability; Hardware Co simulations; Non-linear backstepping controls; Syncronverters; Virtual Synchronous Generators (VSG); V Voltage Ride Through (VRT); Electric power system control; Nonlinear Backstepping Control

International Standard Book Number (ISBN)

978-1-7281-0294-8

Document Type

Article - Conference proceedings

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2019 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.

Publication Date

01 Feb 2019

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