435 Vyom Stability Enhancement in HVDC via STATCOM. A Review

P Rana, Nilaykumar Patel, Vyom Rana, Nilaykumar Patel, M&v Patel
2017 unpublished
This review paperdeals with the stability phenomenon at the inverter side of a HVDC link with STATCOM(Static compensator) ,when connected to weak AC system which has the stability enhancement for power instability. This problem is tackle with STATCOM which not only provide rapid recovery from power , it reduces harmonics , reduces the risk of commutation failure and also offer lower cost for filter design .Power quality can be check at both rectifier and inverter end after the fault. Types of
more » ... e fault. Types of fault taken into considerations are:-1) L-G fault 2) L-L-G fault and 3) DC fault.. This problem is perform via PSCAD/EMTDC simulation and also check voltage profile for the same. INTRODUCTION Line commutated HVDC converter consume large amount of reactive power , the reactive power demands of the converters are 50-60% of the DC power transferred. For the safe operation of HVDC converter there are some concerns such as high over voltage, risk of voltage instability, harmonics, risk of commutation failures. These concerns are closely related to AC voltage regulations at the converter bus. The STATCOM option is likely to be employed with variable speed wind generator systems which will use voltage source converter(VSC) technology to connect to the grid .Earlier research has indicated that the combination of SVC with SC provided much faster system response than SC or SVC alone. Compared with SVC , a STATCOM offers the possibility of feeding the grid with the maximum available reactive current even at low voltage levels, this is possible because in every equilibrium condition the injected reactive power varies linearly with the voltage at the point of common coupling(PCC).
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