Control of MTDC Transmission Systems under Local Information

TL;DR

This paper proposes a distributed control method for multi-terminal HVDC systems that ensures stability and optimal steady-state voltage regulation using local information.

Contribution

It introduces a novel distributed controller with stability guarantees and optimal current injection minimization for MTDC systems.

Findings

Controller guarantees asymptotic stability under certain conditions.

Steady-state voltage deviations are balanced to zero.

Current injection costs are minimized asymptotically.

Abstract

High-voltage direct current (HVDC) is a commonly used technology for long-distance electric power transmission, mainly due to its low resistive losses. In this paper a distributed controller for multi-terminal high-voltage direct current (MTDC) transmission systems is considered. Sufficient conditions for when the proposed controller renders the closed-loop system asymptotically stable are provided. Provided that the closed loop system is asymptotically stable, it is shown that in steady-state a weighted average of the deviations from the nominal voltages is zero. Furthermore, a quadratic cost of the current injections is minimized asymptotically.