General Linearized Model of Voltage Source Converter With Fixed Nodal Admittance Matrix

Voltage source converters (VSCs) are being widely applied in power systems due to the development of renewable energies. The simulation scale of the network is limited by the nonlinearity of VSCs and variable nodal admittance matrix (NAM) due to the switching events. In this letter, a general linearized modeling method with fixed NAM is proposed to realize the efficient modeling of VSCs for real-time simulation. By establishing the state space equations based on the port characteristics of VSCs together with the switching states, a companion circuit with ac and dc sides decoupled is derived by the modified Euler method. Moreover, the proposed model can eliminate the delay between the companion circuit and the global solution of the system, which can effectively improve the simulation accuracy. The performance of the model is validated by real-time simulation and hardware-in-the-loop tests for both pulses-enabled and pulses-blocked scenarios.