Reliability Evaluation of an HVDC Transmission System Tapped by a VSC Station

Abstract

Reliability evaluation of multiterminal HVDC systems has received very little attention in the past. This paper presents reliability modeling and analysis of an HVDC transmission system incorporating a voltage-sourced converter (VSC) tapping station. The use of VSC tapping stations enables the supply of power along the route to areas with comparatively little consumption. In this paper, a comprehensive detailed reliability model is developed and then converted to a manageable and computationally efficient model. Using this equivalent reliability model, various reliability indices are calculated at the load point of the system and the impacts of the VSC tapping station on these indices are illustrated. Sensitivity analyses are conducted to investigate the impacts of the load level and the location of the tapping station on the reliability indices. The conducted studies are numerically applied on a typical HVDC system and thorough discussions are presented.

A Combined Reliability Model of VSC-HVDC Connected Offshore Wind Farms Considering Wind Speed Correlation

“…As such, the series equivalent reliability model of the VSC station can be represented by a typical two-state Markov model using (6.a) and (6.b). The outage data of the VSC-HVDC system are listed in the Appendix [16]- [17], [24]. The equivalent reliability model of the VSC station is listed in Table III 2) DC transmission line: The system includes two main common parallel DC transmission lines using submarine cables.…”

“…A number of studies have been done for the reliability assessment of HVDC systems [16]- [18]. Mostly, these studies focus on the conventional line commuted converter-based HVDC (LCC-HVDC), while few studies have been done for the reliability assessment of power systems with VSC-HVDC systems.…”

Laboratory-based test bed of a three terminals DC networks using power hardware in the loop

“…Due to the large capacitive currents associated with long distance ac power transmission, the use of HVDC transmission for integrating offshore wind farms to inland grid system would be more advantageous with respect to other alternative solutions [1] [3]. The use of Multi-Terminal HVDC (MTDC) is a potential solution for the integration of the wind-farms and oil/gas platforms into the onshore grid system.…”

“…An MTDC network will be then the core of such interconnection. MTDC can also open new power market opportunities and result in better utilization of transmission lines [3] [4]. This paper proposes a test bed design of a three stations MTDC grid based on VSC converters.…”

Short-term reliability equivalence algorithm for flexible transmission equipment

“…the cooling systems, are also important to fulfill the designed function [10][11][12][13][14]. The reliability data is the basis for the probabilistic adequacy and security evaluation of composite power systems.…”