Some Issues Concerned with PMU-Based Security Control of Electric Interconnected Systems

Volume 1 - Issue 4

Patricio Robles*

Received: January 22, 2019;   Published: January 25, 2019

DOI: 10.32474/ARME.2018.01.000119

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Abstract

The increasing consumption of electrical energy requires higher capacity both in generation as in transmission of electric power and expansion of the networks, including interconnection of systems and High Voltage Direct Current (HVDC) links operating in parallel with Alternating Current Circuits (AC). This reinforces the requirement of having reliable wide area control schemes for obtaining an adequate dynamic security. During last years synchronized phasor measurements as part of a Wide Area Measurement System (WAMS) and Wide Area Monitoring, Protection and Control (WAMPAC) have been incorporated in electric systems of several countries becoming an important component for monitoring, control and protection. Phasor measurement units (PMUs) facilitate the realization of several wide-area actions of control. One of them is to keep the equilibrium between the demanded and available power, in particular under sudden disconnections of generation or load. Among the other actions that can be supported by these systems, one very important for the dynamic security of one electric system is the control of electromechanical oscillations helping to prevent system-wide instabilities and blackouts. This short communication provides a conceptual insight on some applications of synchrophasor measurements as a valuable tool for improving the effectiveness of these kind of control actions and therefore the dynamic security of electric systems.

Keywords: Transmission System; Monitoring; Control; Protection; Voltage; Frequency; Power; Stability; Dynamic Security; Synchrophasor.

Abbreviations: HVDC: High Voltage Direct Current; WAMS: Wide Area Measurement System; WAMPAC: Wide Area Monitoring, Protection and Control; FACTS: Flexible Alternating Current Transmission Systems.

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