Abstract
In multi-infeed HVDC system, the interactions and influences between DC systems AC systems are complex as the electrical distances among DC converter stations which are relatively short. Multi-infeed interaction factor (MIIF) can effectively reflect the interaction among DC systems. The paper theoretically analyzes the impact factors of MIIF like the electrical distances between two DC converter stations and the equivalent impedance of the receiving end AC system. By applying the Kirchhoff’s current law on the inverter AC bus, the paper deduces the analytical expressions for MIIF. From the expression, it is clear how the equivalent impedance of AC system and coupling impedance can affect MIIF. PSCAD simulations validate the effectiveness and the correctness of the proposed expression and some useful conclusions are drawn.
Highlights
With the increase of HVDC transmission lines, AC-DC parallel systems and the structure of multi-infeed DC systems will inevitably occur
Multi-infeed interaction factor (MIIF) was proposed by CIGRE WG B4 Working Group in 2008 as the working guide to measure the interactions among multi-infeed HVDC converter stations [6]
We extend the conclusion to multi-infeed HVDC system
Summary
With the increase of HVDC transmission lines, AC-DC parallel systems and the structure of multi-infeed DC systems will inevitably occur. A multi-infeed HVDC system is formed while inverter stations of a multi-terminal HVDC are connected to the same AC system [1]-[3] For these types of systems, interactions among AC systems and DC systems can influence the characteristics of each other. The voltage interaction among inverter buses is a subject worthy of further study in a multi-infeed HVDC system. Further studies on interactions among converter bus voltages and the analytical expressions of MIIF along with its influence to multi-infeed HVDC system have important meanings. In [13], the analytical expression of MIIF is derived by impedance matrix of system buses, and considers its influence on commutation failure. Theoretical analysis and PSCAD simulations of the analytical expression are given in an extended CIGRE standard HVDC system
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