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The development of new static VAr compensator (SVC) models and their implementation in a power flow program is presented. The modelling is carried out in the phase domain considering the SVC delta-connected physical structure. The SVC is assumed to be a continuous, variable susceptance, which is adjusted in order to achieve a specified nodal voltage magnitude in an adaptive fashion. A polyphase Newton-Raphson power flow program is modified in order to implement the proposed models. Validation of these models is carried out in a benchmark network operating under balanced conditions. SVC performance is assessed in both balanced and unbalanced power network operating conditions. The power flow implementation exhibits a very strong convergence characteristic regardless of the network size.