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The crowbar circuit installed in the rotor side is frequently adopted by doubly-fed induction generator (DFIG) to implement low voltage ride through (LVRT) ability. Based on DFIG transient characteristic, this paper discusses the principle of choosing crowbar resistance and input lasting time from the view point of converter security, wind turbine security and wind power generation system restoring...
Energy storage as an alternative solution for integrating renewable energy into grid has been studied recently. Vanadium Redox Battery (VRB) has been received much attention for its excellent characteristics, especially for large capacity energy storage. This paper focuses on the structure, modeling and control of VRB energy storage system. To cooperate with large scale wind farm /PV station, the...
A flexible electro-conductive rubber sensor for measuring the length of a McKibben pneumatic actuator has been developed. Mckibben actuators are flexible, lightweight, and widely used to actuate power assisting devices for which compliance is required for safety. The actuator's length needs to be measured to control the devices accurately. However, the flexibility and lightweight properties might...
Conventional parallel inverter system always includes control functions for interconnections. It is challenging to develop an effective control method for seamless parallel connection for multi-inverters. A communicationless digital parallel inverter system is designed and developed by the authors and reported in this paper. Considering the influence of resistance on the output impedance of an inverter...
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