scispace - formally typeset
Search or ask a question

Showing papers on "Maximum power point tracking published in 1972"


01 Apr 1972
TL;DR: In this article, a preliminary study of maximum power utilization methods was performed for an outer planet spacecraft using an ion thruster propulsion system and a solar array as the primary energy source.
Abstract: A preliminary study of maximum power utilization methods was performed for an outer planet spacecraft using an ion thruster propulsion system and a solar array as the primary energy source. The problems which arise from operating the array at or near the maximum power point of its 1-V characteristic are discussed. Two closed loop system configurations which use extremum regulators to track the array's maximum power point are presented. Three open loop systems are presented that either: (1) measure the maximum power of each array section and compute the total array power, (2) utilize a reference array to predict the characteristics of the solar array, or (3) utilize impedance measurements to predict the maximum power utilization. The advantages and disadvantages of each system are discussed and recommendations for further development are made.

19 citations


Journal ArticleDOI
TL;DR: In this article, the feasibility of rapid a- stability analysis of electric power systems containing as many as 60 generators by using Liapunov functions was explored, some for the first time.
Abstract: This paper explores the feasibility of rapid a- stability analysis of electric power systems containing as many as 60 generators by using Liapunov functions. Many Liapunov functions, approximate integrals, and critical value equations are presented, some for the first time. The results of applying these functions with the aid of a CDC 6600 digital computer to electric ric power systems whose number of generators is 4, 10, 20, or 60 are given for both the computation time and result accuracy. Recommendations are made for additional research on the development of more accurate ate functions for el'ectric power system analysis.

17 citations


Patent
17 Aug 1972
TL;DR: In this paper, an inverter is connected in series with the power source and inductor and coupled to the alternating current load for cyclically directing the output current of the source to the load for controlling the operative condition thereof.
Abstract: A power supply of the inverter type for controlling the operative condition of an alternating current load includes a power source providing an output current of a desired magnitude. An inductor is connected in the output of the power source to assist in maintaining the output current at the desired magnitude. An inverter is connected in series with the power source and inductor and is coupled to the alternating current load for cyclically directing the output current of the power source to the load for controlling the operative condition thereof.

5 citations


01 Mar 1972
TL;DR: In this article, the output of an array temperature sensor is used to vary the duty cycle of a pulsewidth-modulated impedance regulator so that the array operates at the voltage of maximum power.
Abstract: A technique is described in which a spacecraft solar-cell array is caused to operate at or near maximum power output over a wide range of environmental conditions. The output of an array temperature sensor is used to vary the duty cycle of a pulse-width-modulated impedance regulator so that the array operates at the voltage of maximum power. A resistance-type temperature sensor was found to be applicable for most spacecraft missions. However, a solar cell used as a temperature sensor has the advantage of negligible transient errors on lightweight arrays for orbiting spacecraft.

1 citations