Exploration of simplified modeling method applied to VSC-HVDC converter

The switching action in PWM converters is high nonlinear and consuming expensive computing resources severely. These factors limit large-scale system simulation such as renewable energy integration. This paper proposes simplified modeling method that regards the converter as a dual-port controlled power conversion element by considering its function and controlled characteristic. The controlled characteristic and control strategy are included in the simplified model except for the law of conservation of energy. The simulation results of simplified model from transient state to steady state are in good agreement with the results of detailed model, which shows the simplified model is feasible and has high accuracy. What is more important is that the method is easy to understand and the amount of calculation is dropped greatly by ignoring the internal complex structure of switching process.