Abstract
Modern power systems face several problems at frequencies above the range of traditional stability studies due to the increasing penetration of power electronic devices. This phenomenon has been recently referred to as electromagnetic transient stability and is a growing issue in systems with power electronic converters at any power and voltage level, such as FACTS, high-voltage DC, interfaces for grid connection of renewable energies, custom power devices for power quality enhancement, among others. The study of power systems stability is usually carried out by simulation tools that represent the power system through phasor models. However, due to the faster dynamics of modern systems, the harmonic interaction among the controllers, converters, and electric power components, recent research results suggest that some stability analyses should be conducted with models suitable for wider frequency ranges, e.g., electromagnetic transient models. This paper reviews the use of frequency domain methods to analyze the influence of the modeling approach of passive power components on the results of electromagnetic transient stability studies.
Highlights
ELECTROMAGNETIC transient (EMT) models are commonly used for accurate representation of electric power components or systems subject to switching operations, lightning phenomena or fault conditions [1]
The problems associated with the presence of powerelectronic devices in power systems are gaining attention given the high penetration of FACTS, distributed generation units (DGUs), active filters, high-voltage DC (HVDC) transmission, among others
This is driven by the fact that (i) the complexity in representing the important system dynamics have greatly increased with the integration of power-electronic components, (ii) their distributed nature requires the representation of a greater number of devices in comparison with systems with fewer and centralized conventional plants, and (iii) the confidentiality in their controls and parameters is imposed to protect the intellectual property of manufacturers
Summary
ELECTROMAGNETIC transient (EMT) models are commonly used for accurate representation of electric power components or systems subject to switching operations, lightning phenomena or fault conditions [1]. The first problems at the high-voltage level have been recently experienced in the first worldwide installations of VSC-HVDC in offshore wind farms [4] and point-to-point DC links embedded in the power system [5]–[7] In these particular cases, instabilities appeared at frequencies between 400 and 1700 Hz. Besides the previous problems, harmonic interactions have been experienced previously in traction networks [8], [9] and distribution systems [10]. This paper presents an in-depth review, analysis, and discussion of the state-of-the-art on frequency domain methods to analyze the influence of the modeling approach of passive power components for electromagnetic transient stability studies.
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