Tuning of AC voltage-controlled VSC based Linear Quadratic Regulation

Taoufik Qoria (1) , Chuanyue Li (1) , Ko Oue (1) , Francois Gruson (1) , Frédéric Colas (1) , Xavier Guillaud (1) , Thibault Prevost (2)

1 L2EP - Laboratoire d’Électrotechnique et d’Électronique de Puissance - ULR 2697
2 RTE - Réseau de Transport d'Electricité [Paris]

In the near future, power converters will be massively introduced in transmission grids due to renewable energy sources and high voltage direct current (HVDC) increase. Voltage Source Converter (VSC) control laws assume that Synchronous Generators (SGs) build a stiff AC voltage which allows the synchronization of converters. This is one of the major reasons that limit the high integration of currentsource converters in transmission grid. This constraint is no longer relevant when power converters operate as a voltage source based on the grid-forming concept. This concept uses an inner cascaded PI controllers in order to regulate the output AC voltage. However, it is difficult to tune its controller parameters for stable operation in grid-connected mode. This paper proposes an alternative state-feedback control with integral compensator based linear quadratic regulation (LQR) in order to ensure a stable operation and to get a better AC voltage transient and good decoupling between reactive and active power. The proposed control will be fully analyzed and compared to conventional methods.

Mots clés: Power transmission System; 2-Level Voltage Source Converter; Grid-forming control; Linear Quadratic Regulator; Small-signal analysis; Active power and AC voltage transient coupling

Domaines: Energie électrique

Taoufik Qoria, Chuanyue Li, Ko Oue, Francois Gruson, Frédéric Colas, et al.. Tuning of AC voltage-controlled VSC based Linear Quadratic Regulation. IEEE PES PowerTech 2019, Jun 2019, Milano, Italy. pp.6. ⟨hal-02267371⟩