Abstract: A photovoltaic power generation system includes a photovoltaic array including photovoltaic modules, the photovoltaic power generation system further includes a control apparatus configured to display output characteristics of the photovoltaic array and power generating conditions of the photovoltaic array in synchronization.

Abstract: A blower control device changes a PQ characteristic in a second table so that an operating point (QN, PN) on the PQ characteristic in the second table agrees with an operating point (Q0, P0) on a PQ characteristic in a first table. At this time, the blower control device changes the PQ characteristic in the second table at a rate based on QN and Q0. Furthermore, the blower control device changes a load noise characteristic in the second table at a rate based on QN and Q0. Then, the blower control device calculates load noise corresponding to the operating point (Q0, P0) with respect to each rotation frequency ratio from the changed load noise characteristic. And then, the blower control device determines a rotation frequency ratio corresponding to the lowest load noise as a rotation frequency ratio at which a plurality of fans is rotated.

Abstract: Electric arc discharges between bearing rings in a roller bearing are analyzed by setting a defined operating state based on rotational speed of the roller bearing, temperature of the roller bearing, an imbalance of the roller bearing causing vibrations, lubricants, axial/radial/tilt loads, tilting of the bearing rings relative to each other, pulse shape and pulse repetition rate of an applied electrical voltage, bearing play, and pre-existing damage to the roller bearing. A pulse-shaped electrical voltage between inner and outer bearing ring generates electric arc discharges, wherein for each electric arc discharge a characteristic value representative of energy, power, voltage and/or current and duration of the electric arc discharge is determined. Only those electric arc discharges are evaluated that have a qualifying value determined in accordance with at least one of the characteristic values greater than a predefined limit value.

Abstract: A robotic apparatus for machining tenons on turbine buckets of a steam turbine machine is disclosed. The robotic apparatus includes a machining device having a spindle head. A robotic arm is coupled to the machining device and a base member is coupled to the robotic arm. The base member is mounted independently of the machine element. A vision system is provided for locating the tenon on the turbine bucket. A control system is coupled to the vision system, the machining device and the robotic apparatus. The control system is configured to control movement of the robotic apparatus and the machining device based upon vision system data and spatial information about the tenon and the turbine bucket.