Dynamic Average-Value Modeling of CIGRE HVDC Benchmark System

Abstract

High-voltage direct-current (HVDC) systems play an important role in modern energy grids, whereas efficient and accurate models are often needed for system-level studies. Due to the inherent switching in HVDC converters, the detailed switch-level models are computationally expensive for the simulation of large-signal transients and hard to linearize for small-signal frequency-domain characterization. In this paper, a dynamic average-value model (AVM) of the first CIGRE HVDC benchmark system is developed in a state-variable-based simulator, such as Matlab/Simulink, and nodal-analysis-based electromagnetic transient program (EMTP), such as PSCAD/EMTDC. The 12-pulse converters in the HVDC system are modeled with a set of nonlinear algebraic functions that are extracted numerically. The results from the average-value models are compared with the results of the detailed simulation to verify the accuracy of the AVMs in predicting the large-signal time-domain transients. The

Modeling of HVDC System to Improve Estimation of Transient DC Current and Voltages for AC Line-to-Ground Fault—An Actual Case Study in Korea

“…This paper focuses on the abnormal condition that arise in an HVDC system in the event of commutation failure; i.e., when the extinction angle γ falls below γ min or where µ exceeds 60 • [18][19][20][21]. If µ exceeds 60 • , the subsequent commutation (i.e., from Valve 1 to Valve 3) will commence before completion of the current commutation (i.e., from Valve 2 to Valve 6).…”

“…In particular, power systems computer aided design/electromagnetic transients including DC (PSCAD/EMTDC, or simply PSCAD) and MATLAB/SIMULINK have been used to elaborate the control schemes of CIGRE HVDC benchmark system models [21][22][23]. However, the AC network models used in these studies were simplified by using voltage sources and equivalent impedances, primarily because of the models' limited ability to model complex, large-scale AC networks.…”

Operation Analysis of Thyristor-Based Front-to-Front Active-Forced-Commutated Bridge DC Transformer in LCC and VSC Hybrid HVDC Networks

“…Nevertheless, LCC offers higher conversion efficiency and proven reliability up to ultra-high voltage (UHV) applications compared to the VSC solutions using self-commutated switches. Therefore, it remains dominant in the construction of large-scale converter station for UHVDC links [7][8][9]. The compensation strategies for improving the commutation and reactive power performances of LCC can be implemented by using controlled capacitors or VSCs [10][11][12].…”

HVDC grid test models for different application scenarios and load flow studies

“…Though a HVDC grid has many advantages, there are challenges that HVDC grid researchers need to face and deal with, such as how to control power flow and direct voltage and how to achieve fast control and protections. Currently, the researchers around world are undertaking HVDC grids related R&D work with their own models which are of different configurations and data [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19].…”