Showing papers on "Maximum power point tracking published in 1970"
Patent•
06 Aug 1970TL;DR: In this article, 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.
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.
124 citations
Book•
01 Jan 1970TL;DR: This paper presents basic principles of the economic operation of power systems, and some of the techniques used in this operation include EHV Operation, Telemetering Methods, and Supervisory Control and Data Acquisition System.
Abstract: Basic Principles. Transfer of Energy in Power Systems. VAR Flows. Economic Operation of Power Systems. Power System Control. Energy Accounting in Interconnected Disciplines. Power System Communication. Telemetering Methods. Supervisory Control and Data Acquisition System. Power System Reliability Factors. Power System Protection. Power System Stability. EHV Operation.
68 citations
20 Apr 1970
TL;DR: In this paper, a solar cell array power, converted by a switching regulator, is used to charge a battery and supply spacecraft loads, if the combined battery and load power requirements exceed the available array power.
Abstract: The unit described here is designed for the Airlock Vehicle that will permit coupling between an Apollo spacecraft and a Saturn IVB stage to form a manned orbiting workshop. Solar cell array power, converted by a switching regulator, is used to charge a battery and supply spacecraft loads. Maximum power is extracted from the array if the combined battery and load power requirements exceed the available array power. In addition, the charger provides trickle charge, charge cutoff, and battery voltage and temperature limit functions while supplying spacecraft load power. The special feature of this unit is that the peak array power can vary from 7 0 watts to 2580 watts. Operating array open circuit voltage can be as high as 125 volts. Another feature is that failure of any component will, at most, result only in a slight performance degradation.
5 citations
TL;DR: In this article, a PWM static inverter is used in uninterruptible power systems with transfer times of 1/4 cycle or less, which is extremely important in critical AC power applications for on-line process controls and computers.
Abstract: This paper describes a PWM Static Inverter as used in Uninterruptible Power Systems having transfer times of 1/4 cycle or less. Such performance is extremely important in critical AC power applications for on-line process controls and computers where longer duration outages would result in very costly and extensive down time. A static switching bypass system is outlined, a comparison of inverter types is given and the compatibility and performance advantages of the PWM Static Inverter as used in this bypass system are presented.
1 citations