Khajeh-Shalaly, B., Shahgholian, G. (2017). Design and Analysis of a Novel Robust and Fast Sliding-Mode Control with Multi-Slope Sliding Surface for Single-Phase Three Level NPC Inverters under Different Loads and Reduce the Output THD. *Nashriyyah -i Muhandisi -i Barq va Muhandisi -i Kampyutar -i Iran*, 15(2), 103-113.