Decentralized Supplementary Control of Multiple LCC-HVDC Links

Abstract

This paper presents a decentralized wide-area coordinated supplementary control of multiple line-commutated converter (LCC)-HVDC links to 1) prevent interactions among the HVDC links and 2) enhance the damping of the inter-area oscillatory modes. The proposed approach is based on the sparsity-promoting optimal control. The main features of the proposed approach are 1) it requires minimal communication infrastructure to achieve the control objectives and thus reduces the impacts of communication delays and noise, 2) it entails in an optimal gain which preserves the closed-loop stability and 3) it does not require the estimates of the system states. The performance of the proposed controller is evaluated based on eigen analysis and time-domain simulation of an interconnected AC system that includes five LCC-HVDC links. Performance of the proposed controller is also compared with those of fully centralized and conventional local supplementary controllers and its merits are highlighted. The studies indicate the proposed controller, based on 13 remotely communicated signals, provides similar performance as that of a fully centralized optimal controller using 2050 communicated signals and is far superior to the conventional local supplementary controllers.Index Terms-Decentralized control, high voltage direct current (HVDC), inter-area oscillations, sparsity.

Review of DFIG wind turbine impact on power system dynamic performances

“…The study result in Ref. shows that decentralized control can provide shorter time delays even with lower network bandwidth. In Ref.…”

An Overview of Ancillary Services and HVDC Systems in European Context

“…i LCC-based HVDC system: The authors in [59][60][61][62] have proposed some approaches to control the system voltage from LCC-based HVDC systems. Voltage stability analysis for multi-feed HVDC system using STATCOM has been presented by authors in [63].…”

“…Methods for providing blackstart service with LCC-based HVDC systems has been detailed in [67,68]. Methods for power oscillation damping using LCC-based HVDC systems for connected AC systems are detailed in [62,69,70]. ii VSC-based HVDC system: In [71,72], the authors have proposed VSG approach for providing fast frequency control and virtual inertia from the VSC-based HVDC converter stations.…”

State Estimation for Hybrid VSC Based HVDC/AC Transmission Networks

“…However, this has changed when each section became larger, and dedicated but connected SCADAs were provided for each energy level, later called hierarchical control and supervision (stations and sub-stations) [2,12]. The same architecture is used with the HVDC stations and transmission grids, they are operated by separate SCADA systems as shown in Figure 1 [1][2][3][13][14][15]. As a result, the research on SCADA for hybrid HVDC/AC transmission (mainly VSC based) is divided into two main approaches, a distributed or decentralized approach such as in [16][17][18][19], and centralized or hierarchical structure such as in [1,2,[20][21][22].…”