Vidal, Ana4; Yepes, Alejandro G.4; Fernandez, Francisco Daniel Freijedo1; Malvar, Jano4; Lopez, Oscar5; Doval-Gandoy, Jesus4
1 The Faculty of Engineering and Science, Aalborg University, VBN2 Department of Energy Technology, The Faculty of Engineering and Science, Aalborg University, VBN3 Power Electronic Systems, The Faculty of Engineering and Science, Aalborg University, VBN4 University of Vigo5 unknown
Rigorous analysis and design of the current control loop in voltage source converters (VSCs) requires an accurate modeling. The loop behavior can be significantly influenced by the VSC working conditions. To consider such effect, converter losses should be included in the model, which can be done by means of an equivalent series resistance. This paper proposes a method to identify the VSC equivalent loss resistance for the proper tuning of the current control loop. It is based on analysis of the closed-loop transient response provided by a synchronous proportional-integral current controller, according to the internal model principle. The method gives a set of loss resistance values linked to working conditions, which can be used to improve the tuning of the current controllers, either by online adaptation of the controller gains or by open-loop adaptive adjustment of them according to prestored data. The developed identification procedure is tested in the laboratory at different specifications of power level and switching frequency.
I E E E Transactions on Power Electronics, 2015, Vol 30, Issue 3, p. 1747-1761
Control design; Current control; Digital control; Power conversion; Pulse width modulated power converters