List of Articles High voltage direct current Open Access Article Abstract Page Full-Text 1 - Damping Controller Design in Offshore Wind Power Plants to Improve Power System Stability Using Fractional Order PID Controllers Based on Optimized Exchange Market Algorithm Naser Taheri Hamed Orojlo Faramarz Ebrahimi Open Access Article Abstract Page Full-Text 2 - HVDC Line Model for Load Frequency Control Using Harmony Search Algorithm Application Mohammadali Shahab Ghazanfar Shahgholian