Abstract
Time-delay is inherent to communications schemes in power systems, and in a closed loop strategy the presence of latencies increases inter-area oscillations and security problems in tie-lines. Recently, Wide Area Measurement Systems (WAMS) have been introduced to improve observability and overcome slow-rate communications from traditional Supervisory Control and Data Acquisition (SCADA). However, there is a need for tackling time-delays in control strategies based in WAMS. For this purpose, this paper proposes an Enhanced Time Delay Compensator (ETDC) approach which manages varying time delays introducing the perspective of network latency instead dead time; also, ETDC takes advantage of real signals and measurements transmission procedure in WAMS building a closed-loop memory control for power systems. The strength of the proposal was tested satisfactorily in a widely studied benchmark model in which inter-area oscillations were excited properly.
Highlights
Wide Area Measurement Systems (WAMS) bring information to the control center in modern power systems to improve observability for achieving stability and security [1,2]
The present paper proposes a formal model to include the nonlinearities of power systems and the variability of time-delays, which is made with the purpose to provide a more appropriate representation of the WAMS communications infrastructure
We show an improved time compensator named Enhanced Time-Delay Compensator (ETDC), which is more suitable for practical power systems and represents a major improvement when compared to previous research in two main aspects: (a) it manages varying values of latencies under a new paradigm that re-evaluates the dead time misconception and (b) incorporates real WAMS operational elements
Summary
Wide Area Measurement Systems (WAMS) bring information to the control center in modern power systems to improve observability for achieving stability and security [1,2]. Moktari developed a time compensator based on fuzzy logic, which works well for higher values of time delays close to tens of milliseconds; it fails in cases of disturbances associated with tripping lines [22] Another more sophisticated perspective considers the complexities of actual WAMS. Following with the literature revision, the authors in [27] obtain worthy results using buffers and a widearea power oscillation damper (WPOD) to compensate for delays and packet dropouts; the implementation is based on a straightforward model for single-input single-output applied in a Double-Fed Induction Generator (DFIG) Another drawback in the proposal: it takes a long time to stabilize signals (more than 20 seconds) with dangerous power explorations (more than one hundred percent and negative values). The results of the simulation (Section 4), conclusions, and further works (Section 5) are presented
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