Abstract
High voltage low inductance capacitors are used in converters as HVDC-links, snubber circuits and sub model (MMC) capacitances. They facilitate the possibility of large peak currents under high frequent or transient voltage applications. On the other hand, using capacitors with larger equivalent series inductances include the risk of transient overvoltages, with a negative effect on life time and reliability of the capacitors. These allowable limits of such current and voltage peaks are decided by the ability of the converter components, including the capacitors, to withstand them over the expected life time. In this paper results are described from investigations on the electrical environment of these capacitors, including all the conditions they would be exposed to, thereby trying to find the tradeoffs needed to find a suitable capacitor. Different types of capacitors with the same voltage ratings and capacitances where investigated and compared a) on a component scale, characterizing the capacitors transient performance and b) as part of different converter applications, where the series inductance plays a role. In that way, better insight is achieved on how the capacitor construction can affect the total performance of the converter.
Highlights
Technical University of Denmark Elektrovej 325 2800 Lyngby Denmark situations where transients can affect the converter
Global wind power growth is foreseen to continue in the future with development of large-scale wind power plants (WPPs) located far offshore and with a need for HVDC as export connection
Integration of these WPPs to the onshore grids will develop from point-to-point connections to a transnational multi-terminal network where the transmission capacity which serves both to export the wind power and to facilitate power trading between countries
Summary
Technical University of Denmark Elektrovej 325 2800 Lyngby Denmark situations where transients can affect the converter. In order to minimize the ripple in the dc voltage, large submodule capacitors are required. Application of large submodule capacitors results in slower changes of the dc voltage in respond to changes in power exchanged at the dc side of the converter.
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