Abstract
In recent years, voltage source converter (VSC) HVdc has emerged as an excellent solution for transmitting offshore renewable energy sources and strengthening transmission corridors. It is also reported in the literature that VSC-HVdc is able to enhance specific types of stability. With growing capacity of VSC-HVdc and increasing uncertainty in the current power system, it is essential to perform a rigorous analysis of its impact on the interdependence of power system dynamics. This paper presents a methodology for the thorough assessment of the impact of VSC-HVdc on interdependence among four types of stability: small-disturbance rotor angle, large-disturbance rotor angle, frequency, and voltage. This analysis is performed assuming uncertain conditions for various VSC-HVdc topologies and system loading and generation conditions. The impact of the VSC-HVdc on the interdependence of dynamic performance is assessed using the Spearman correlation coefficient as a quantification tool. The results obtained show that a significant alteration over the interdependence between power system dynamics occurs with the addition of VSC-HVdc.
Highlights
T HE renewable energy sector has grown tremendously in recent years due to increasing awareness and incentives from governments and the advancement of power electronics [1], [2]
This paper provides the following novel contributions: i) a methodology for quantifying the impact of Voltage Source Converter (VSC)-HVDC on the interdependency of power system dynamics; ii) thorough probabilistic evaluation of the impact of VSCHVDC on multiple system dynamic phenomena; iii) a technique to establish the required number of Monte Carlo simulations for stability interdependency assessment; iv) rigorous quantification regarding the changes in interdependency of power system dynamics after the addition of VSC-HVDC under varying loading conditions
A methodology to enable the systematic quantification of the interdependency of various stability types with respect to the addition of VSC-HVDC has been presented
Summary
T HE renewable energy sector has grown tremendously in recent years due to increasing awareness and incentives from governments and the advancement of power electronics [1], [2]. Voltage Source Converter (VSC) based HVDC transmission enables independent control over active and reactive power, making the technology well suited to support the fluctuating demands of the grids to which they are connected [3]. It has been shown in previous research that VSC-HVDC lines are able to enhance specific types of power system stability [5]– [10]. In [7], it is proposed that during fault conditions, active power is injected into the grid in proportion with the weighted-average frequency at each VSC terminal This control is able to enhance the transient stability of the system and maintains the DC voltage. This paper provides the following novel contributions: i) a methodology for quantifying the impact of VSC-HVDC on the interdependency of power system dynamics; ii) thorough probabilistic evaluation of the impact of VSCHVDC on multiple system dynamic phenomena; iii) a technique to establish the required number of Monte Carlo simulations for stability interdependency assessment; iv) rigorous quantification regarding the changes in interdependency of power system dynamics after the addition of VSC-HVDC under varying loading conditions
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