Showing papers on "Maximum power point tracking published in 1974"

Communicating over power network within a building or other user location

Abstract: Power lines within a building or other user location are connected through a fuse and a filter to an external power grid that supplies power at the usual 50 Hz or 60 Hz. Communications apparatus such as a central computer and a number of typewriters is connected to the power lines within the building at at least two locations and transmits communications signals over the power lines. The communications signals have a frequency different from the frequency of the electrical power supplied by the external power grid and preferably in the audio range. The filter is tuned to pass the electrical power but substantially to block passage of the communications signals. Two important advantages are that the power lines within the building double as communications lines and that the building presents a purely resistive load to the external power grid, so that the grid has an improved power factor.

Short HVDC transmission system with power factor control

Abstract: A method and apparatus for regulation of the power factor of a 3-phase network fed with power from another 3-phase network via a short high-voltage direct current transmission link interconnecting the two networks. The d.c. transmission link includes rectifier and inverter stations connected at opposite ends of the link and the inverter station is controlled in such manner as to supply power to the fed network at a variable leading power factor in dependence upon the actual power factor of the fed network.

Method for connecting a static inverter and a power source in parallel to supply electric energy to a load and a logic device for implementing the method

Abstract: The method for connecting a static inverter and a power source in parallel to a load comprising the preliminary step of adjusting the voltage, frequency and phase of the static inverter to those of the power source by servo-control of these characteristics of the static inverter output, and the further steps of effectively connecting the static inverter and power source in parallel with the load, and simultaneously replacing the voltage servo-control by current servo-control of the static inverter output and modifying the frequency and phase of the static inverter output by synchronizing the master clock of the static inverter. A logic circuit for carrying out this method is further described.

Uncertainties in predicting solar panel power output

Abstract: The problem of calculating solar panel power output at launch and during a space mission is considered. The major sources of uncertainty and error in predicting the post launch electrical performance of the panel are considered. A general discussion of error analysis is given. Examples of uncertainty calculations are included. A general method of calculating the effect on the panel of various degrading environments is presented, with references supplied for specific methods. A technique for sizing a solar panel for a required mission power profile is developed.