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Insufficient reactive power in DC converter stations may deteriorate the whole system operating conditions. In this paper, the ratio between reactive power consumption and active power transmission as a HVDC system provides Emergency DC Power Support (EDCPS) is analyzed and derived. Then multicircuit HVDC system EDCPS Strategies with reactive power controls, such as emergency reactive power compensation,...
An adaptive fuzzy voltage dependent current order limiter (VDCOL) to enhance the performance of a multi-feed-in HVDC system is proposed in this paper. The adaptive fuzzy VDCOL exports an adaptive current order through fuzzy rules which need one point's voltage of HVDC transmission line and its derivative to time. The study of a MDDC model shows that not only the adaptive fuzzy VDCOL strategy can lead...
This paper deals with the topic of power system stability in the case of expanding a conventional three-phase AC grid with HVDC connections. With respect to the requirements of modelling power system elements for stability studies a simulation model is built. A fast method for evaluating the power system stability based on modal analysis is proposed. Different scenarios of expanding or replacing overhead...
This paper illustrates a study on HVDC light for its enhancement of AC/DC hybrid transmission system and multi-infeed HVDC system. In the sense of the realizing independent controlling of active and reactive power, HVDC light is more effective compared to the conventional HVDC system. An AC/DC parallel transmission system and a three-infeed HVDC system are modeled using PSCAD/EMTDC. Simulations corresponding...
This paper exposes the feasibility to connect high voltage DC transmission (HVDC) systems to very weak AC networks leading to short circuit ratios (SCR) lower than 1.5. The existing literature does not provide solutions for such a low SCR systems and often the HVDC expansions cannot grow enough as expected. The studies developed are for the short-term voltage stability phenomena, where a solution...
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