Abstract
A new modeling method for high voltage direct current (HVDC) systems and associated controllers is presented for the power system simulator for engineering (PSS/E) simulation environment. The aim is to improve the estimation of the transient DC voltage and current in the event of an AC line-to-ground fault. The proposed method consists primary of three interconnected modules for (a) equation conversion; (b) control-mode selection; and (c) DC-line modeling. Simulation case studies were carried out using PSS/E and a power systems computer aided design/electromagnetic transients including DC (PSCAD/EMTDC) model of the Jeju– Haenam HVDC system in Korea. The simulation results are compared with actual operational data and the PSCAD/EMTDC simulation results for an HVDC system during single-phase and three-phase line-to-ground faults, respectively. These comparisons show that the proposed PSS/E modeling method results in the improved estimation of the dynamic variation in the DC voltage and current in the event of an AC network fault, with significant gains in computational efficiency, making it suitable for real-time analysis of HVDC systems.
Highlights
In recent years, high voltage direct current (HVDC) technology has attracted growing attention for power transmission between networks
The converting equations for abnormal operation, which arise because of commutation failure under the conditions of fault occurrence in the AC transmission network, are developed and integrated into power system simulator for engineering (PSS/E) to estimate the variations in the DC voltages and currents of the HVDC system
A new modeling method for an HVDC system and associated controllers was proposed to improve the estimation of transient variations in the DC voltage and current when an AC line-to-ground fault occurs in an adjacent transmission network
Summary
High voltage direct current (HVDC) technology has attracted growing attention for power transmission between networks. The converting equations for abnormal operation, which arise because of commutation failure under the conditions of fault occurrence in the AC transmission network, are developed and integrated into PSS/E to estimate the variations in the DC voltages and currents of the HVDC system. Because of the relatively large simulation time-steps in PSS/E, HVDC system modeling scopes in PSS/E often include a constant current loop level, voltage-dependent current order limit (VDCOL), and master control It normally takes only a few seconds to analyze the dynamics of an HVDC system, which is advantageous for both power grid operators and researchers. The built-in VDCOL function provided in the CIGRE benchmark model only takes two set points, the pair (Vdc , Idc ), as input This is often inconsistent with the operating characteristics of real HVDC systems; for example, the Jeju–Haenam HVDE system takes nine set points. The proposed modeling method improves estimation of the DC voltage, DC current, and AC current that is injected into the converters during the transient operation of the HVDC system triggered by commutation failure
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