Power-system protection

About: Power-system protection is a research topic. Over the lifetime, 6353 publications have been published within this topic receiving 117961 citations.

A graphical electromagnetic simulation laboratory for power systems engineering programs

Abstract: The recent availability of Electromagnetic Transient Programs with graphical front ends now makes it possible to put together models for circuits and systems in a manner similar to the connection of components in a laboratory, In the past, the nongraphical EMT Programs required considerable expertise in their use and thus distracted the students into the details of simulation. The introduction of a graphical simulation based laboratory into undergraduate and graduate power engineering education programs is presented, based on the PSCAD/EMTDC program. The philosophy behind the design of suitable example cases is presented within the framework of an Undergraduate Power Electronics Course, an HVDC Transmission Course and a course on Power System Protection.

Cascading Failure Attacks in the Power System: A Stochastic Game Perspective

Abstract: Electric power systems are critical infrastructure and are vulnerable to contingencies including natural disasters, system errors, malicious attacks, etc. These contingencies can affect the world’s economy and cause great inconvenience to our daily lives. Therefore, security of power systems has received enormous attention for decades. Recently, the development of the Internet of Things (IoT) enables power systems to support various network functions throughout the generation, transmission, distribution, and consumption of energy with IoT devices (such as sensors, smart meters, etc.). On the other hand, it also incurs many more security threats. Cascading failures, one of the most serious problems in power systems, can result in catastrophic impacts such as massive blackouts. More importantly, it can be taken advantage by malicious attackers to launch physical or cyber attacks on the power system. In this paper, we propose and investigate cascading failure attacks (CFAs) from a stochastic game perspective. In particular, we formulate a zero-sum stochastic attack/defense game for CFAs while considering the attack/defense costs, budget constraints, diverse load shedding costs, and dynamic states in the system. Then, we develop a Q-CFA learning algorithm that works efficiently in power systems without any a priori information. We also formally prove that the convergence of the proposed algorithm achieves a Nash equilibrium. Simulation results validate the efficacy and efficiency of the proposed scheme by comparisons with other state-of-the-art approaches.

Power System Operation

Abstract: Basic Principles. Transfer of Energy in Power Systems. VAR Flows. Economic Operation of Power Systems. Power System Control. Energy Accounting in Interconnected Disciplines. Power System Communication. Telemetering Methods. Supervisory Control and Data Acquisition System. Power System Reliability Factors. Power System Protection. Power System Stability. EHV Operation.

Advantages of voltage sourced converter (VSC) based design concepts for FACTS and HVDC-link applications

Abstract: The application of FACTS and HVDC technologies, in the form of voltage sourced converter (VSC) based designs; continue to be implemented throughout North America and other parts of the world for improved transmission system control and operation. FACTS and HVDC-link technologies allow more efficient utilization of existing transmission networks and help to better facilitate needed transmission system expansion. The wide-scale application of these technologies leads to numerous benefits for electrical transmission system infrastructure, including increased capacity at minimum cost; enhanced reliability increased capacity at minimum cost; enhanced reliability through proven performance; higher levels of security by means of sophisticated control & protection; and improved system controllability with state-of-the-art technology concepts. Both conventional and advanced forms of FACTS and HVDC transmission technologies exist and are in operation today. Advanced solutions are in the form of VSC based designs, including configurations for static synchronous compensators (STATCOM), unified power flow controllers (SSSC), and VSC-based back-to-back DC links (VSC-BTB), to name a few. This paper highlights the advantages provided by the VSC design concept for FACTS ad HVDC-link system applications.

Interconnection protection of IPP generators at commercial/industrial facilities

Abstract: Much of the new generation capacity installed during the next millennium will be accomplished through the construction of independent power producer (IPP) generating facilities. These facilities can take the form of small dispersed generating units, or large-capacity plants owned and even operated by nonutility personnel. It is forecasted that many of these dispersed generating units will be at smaller industrial and commercial facilities and operating in parallel with the utility system to reduce energy cost through load sharing or "peak shaving." This paper discusses the protection requirements to interconnect these generators to utility systems, as well as methods to reconnect these generators after interconnect protection tripping.