Mechanisms of driver integrated blanking time compensation

Abstract

Model-based control of converter-connected assets is an option to establish excellent dynamics. Such a control strongly relies on the quality of the model used. In case of power-electronic converters, blanking-time effects introduces a large voltage error, especially at low output voltage. Blanking-time effects depend on the sign (and, to a lesser degree, on the magnitude) of the current flowing in the instant of each single switching event. This can be predicted and compensated by the control - but the effort is high. Also, especially at low current magnitude, the risk of prediction failures grows - and leads to an increase of the voltage error in case of prediction errors. Reducing the risk of miss-prediction requires high modelling effort and/or fast current measurement processed by the main control loop - causing high effort and cost. This paper presents and discusses opportunities and advantages of driver integrated blanking time compensation with low additional effort. A concept for realization is introduced.