Abstract
When the large-scale renewable power island is connected to VSC-HVDC transmission system, we should figure out the steady-state operation area of VSC-HVDC converter station. Based on the equivalent model of renewable energy island, the constraints of VSC-HVDC converter station are analyzed, and a fast method for calculating steady-state operation area of converter station is presented in this paper. The influence of equivalent line impedance of renewable energy island, transformer ratio of converter station and voltage setting value of grid-connected point on steady-state operation area of converter station is analyzed. And the three-dimensional view of the steady-state operation area of the converter station under different grid-connected voltage is depicted.
Highlights
VSC-HVDC transmission technology has obvious advantages in clean energy grid-connected, island power supply, offshore platform power supply and other technical fields([1],[2])
The renewable energy island is decoupled from the AC power grid when it is delivered through the VSCHVDC transmission system
The equivalent line impedance of renewable energy islands, the voltage setting value of converter station and the converter conversion ratio may vary during the operation of the system, changing the size of other electrical quantities of the system
Summary
VSC-HVDC transmission technology has obvious advantages in clean energy grid-connected, island power supply, offshore platform power supply and other technical fields([1],[2]). [10] analyzed the operation characteristics of the renewable energy isolated network connected to the VSC-HVDC power grid, considered the constraints that the steady-state operation interval should met, and describes the steady-state operation area by traversal method. The influence of various operations on the steady-state operation area is analyzed, such as connecting transformer tap, the VSC-HVDC reference voltage, the impedance characteristics of equivalent distance of the renewable energy cluster and the VSC-HVDC converter station. The influence of equivalent line impedance of renewable energy island, transformer ratio of converter station and voltage setting value of gridconnected point on steady-state operation area of converter station is analyzed. The three-dimensional voltage-power operation characteristic curve is depicted, the influence of grid-connected voltage on steady-state operation area of converter station is more intuitively depicted
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