Energy storage devices are required for power quality maintenance in stand alone power systems like wind-diesel ones. A redox flow battery system has many virtues which make its integration with a wind-diesel power system attractive. This paper proposes the integration of a redox flow battery system with a typical multi-machine wind-diesel power system for simultaneous voltage and frequency regulation. The redox flow battery is connected to wind park bus through a current controlled voltage source converter based on hysterisis current control. Keeping in view the non-linear and time varying nature of the hybrid wind-diesel-redox flow battery system, neuro-adaptive control is proposed for active/reactive power modulation of the redox flow battery.