Abstract
The multi-infeed interaction factor (MIIF) is used extensively in indicating the degree of interaction among high-voltage direct current (HVDC) converters and is currently calculated by simulation methods according to the definition, or by using the equivalent impedance ratio method. The first method is an experimental calculation method and the second method does not account for the effects of HVDC control modes. An analytical calculation method for MIIF considering control modes of HVDC links is proposed in this paper. First, the voltage variation of converter bus in the context of small disturbance is equated by using the bus impedance matrix. In this way the equations for the solution of MIIF considering HVDC control mode are obtained. Subsequently, based on two rational assumptions, the practical analytical calculation expression of MIIF is deduced in detail. The MIIF calculation method proposed in this paper is an improvement of the equivalent impedance ratio method and reflects the main influencing factors of voltage interaction including HVDC control modes. Moreover, the derived analytical expression can give a fundamental insight into parameter dependencies of voltage interaction. Finally, the validity and accuracy of the proposed approach are demonstrated in both dual-infeed HVDC system and actual large-scale power grid.
Highlights
With the implementation of power transmission from West China to East China, more and more high-voltage direct current (HVDC) transmission projects have been putting into commercial operation in China recent years owing to its advantages in long distance and bulk power transmission with lower energy loss [1]
This paper proposes an analytical calculation method for multi-infeed interaction factor (MIIF) considering the control modes of HVDC links
This paper presented a new analytical method to calculate MIIF considering control modes of HVDC links
Summary
With the implementation of power transmission from West China to East China, more and more high-voltage direct current (HVDC) transmission projects have been putting into commercial operation in China recent years owing to its advantages in long distance and bulk power transmission with lower energy loss [1]. This method is presented in the form of a simple analytical expression: MIIFij = Zij /Zjj and can be used for fast calculation of MIIF This method does not consider the effects of HVDC control modes and can only be used to study the impacts of the equivalent AC system parameters on MIIF. A practical MIIF analytical calculation method is obtained This method is an improvement of the equivalent impedance ratio method and can effectively reflect the impacts of control modes on voltage interaction among HVDC links. The analytical expression for MIIF considering HVDC control modes is derived in detail based the static equivalent of AC/DC transmission systems and the small disturbance analysis of converter bus voltage.
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