Sunlight power generation system

• Main Authors: KANODA SUZUHIKO, OKUBO BINICHI, UCHIYAMA TOSHIYUKI, NIKI TORU
• Format: Patent
• Language: Chinese; English
• Published: 15.01.2014
• Subjects: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS; CONTROL OR REGULATION THEREOF; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION; GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRA-REDRADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, E.G. USINGPHOTOVOLTAIC [PV] MODULES

In a sunlight power generation system, improvement of MPPT efficiency is an issue. The maximum electric power point is difficult to detect by the conventional hill climbing method when partial shade happens. On the other hand, a detection mode for detecting the maximum electric power point in a short period is valid when partial shade happens, but if values of choking coils and filter capacitors are reduced to reduce size and costs, a control system oscillates near a short-circuit current, such that the accurate maximum electric power point cannot be detected. Additionally, variation of output to the system before and after the detection mode is large. In the sunlight power generation system provided by the invention, in the detection mode, the time scale increases gradually while open-loop control of a switch element is driven, and the detection model finishes when the time scale reaches a preset maximum value, so as to prevent oscillation. Furthermore, execution of the detection model and zero crossing of a