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This paper proposes a reduced order mathematical model for the VSC converter and its controls by linearizing the combined set of equations of the power system and controller. The reduced order model can preserve the unstable characteristic of the VSC system and provide an explicit mathematical expression for the system eigenvalues. This analytical formula can directly reveal by simple inspection relationships...
Earlier work on calculating maximum power curves (MPCs) and maximum available power (MAPs) for VSC converters was not consistent with the way it is done for LCC converters. This paper attempts to use an approach consistent with LCCs by using a Thévenin voltage that is calculated to give 1.0 pu terminal voltage at rated power and unity power factor for the VSC. The MAP values calculated using this...
The paper investigates power transmission limitations in a VSC-HVDC system imposed by the ac system's impedance characteristics. An important observation from the study is that the operation of the converter is affected, not only by the magnitude of this impedance (quantified by the Short Circuit Ratio or SCR), but also significantly by its angle. An interesting result is that the larger the resistive...
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