A. Turbine Area Network
In order to monitor the wind turbine operation, many sensor nodes and measurement devices are installed inside the wind turbine. In Fig. 3, the data collection unit (DCU) is located at wind turbine side, as it represents the intermediate stage between the sensor monitoring system and the communication network interface (optical network unit (ONU) or wireless access point (AP)). The connection between the control center and wind turbine could be configured to be direct wired, direct wireless or hop-by-hop wireless.