Showing papers on "Grid-connected photovoltaic power system published in 1970"

System for detecting and utilizing the maximum available power from solar cells

Abstract: In a power solar cell array consisting of many solar cells connected to deliver useful electrical power, there is imbedded a smaller reference solar array consisting of solar cells connected in series with a Zener diode and load resistor so devised that the voltage that appears across the load resistor is equal to or a constant fraction of the voltage at which the power array, operating at the same temperature and solar exposure as the reference array, delivers maximum electrical power. The voltage difference between the large solar array or the given fraction thereof and the reference solar array is used directly as means to constrain the large array to operate at the voltage of maximum power, typically any excess power being used to charge a storage battery.

H.V.D.C. Stations Connected to Weak A.C. Systems

Abstract: The operation of a h.v.d.c. converter station connected to a three- phase power system having a low short-circuit capacity gives rise to a series of special problems which must be treated together in order to produce an economic solution for the whole transmission system. The design of the reactive power supply for such a system is given particular attention and the question of a suitable grid control method for the converters is discussed in connection with the problem as a whole. In this way the complete technical and economic framework for the economic layout of a h.v.d.c. station fed by a weak a.c. system is demonstrated.