Nonlinear dynamics in HVDC systems

VOJt;lgC instability in AC power systems has been widely studied from n nonlinear dynamical system perspective. In contrast, this approach for HYDe systems is of recent origin and rudimentary, therefore much basic work in this area remains to be developed. Thus this work presents a comprehensive and fundamental analysis of the nonlinear phenomena in HYDe systems. In particular the conditions for occurcncc of nonlinear phenomena ,HʹC derived analytically for a basic and enhanced dynamic HVDe system models. These results consequently identify: 0) the various system and HYDe control parameters which influence the nonlinear behaviour (ii) oscillatory instability in HVDe systems as a feasible vOltage collapse mechanism (iii) the explicit relationship between the quasi-static and dynamic conditions for aperiodic voltage collapse.