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Maximum Power Point Tracking without Current Sensor for Small Scale Photovoltaic Power system
Nobuyuki Kasa,Takahiko Iida,Gourab Majumdar 전력전자학회 2001 ICPE(ISPE)논문집 Vol.2001 No.10
This paper presents a maximum power point tracking without a current sensor for a small scale photovoltaic power system. The small scale photovoltaic power systems are used in parallel, and so the cost and the reliability are strongly demanded. In the proposed inverter, the current is controlled with open loop, and then the power of photovoltaic array is calculated by the equation using the voltage of the photovoltaic array. Therefore, the system can obtain the power by detecting only the voltage of the photovoltaic array. As a result, we may obtain the performance of the MPPT with a current sensor as well as with a current sensor.<br/>
GCT Technologies and their applications
Kazuhiro Kurachi,Kazunori Taguchi,Gourab.Majumdar 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
Continuous development and evermore demanding applications, have led to significant improvements in high power semiconductors devices to date. High power devices such as GTO (Gate Turn Off Thyristor), GCT (Gate Commutated Turn Off Thyristor) and HVIGBT (High Voltage Insulated Gate Bipolar Transistor) module have been widely adopted in large capacity power electronics equipment such as electric railway, power management, power transportation and industrial fields. However, long term reliability is expected from these applications and from the viewpoint of environmental management, reduction in equipment size and improvement in efficiency are required. Until 20 years ago, the mainstream device for high power electronics was the GTO but since the late 1990s, they have been replaced with new devices such as GCTs and HVIGBTs. Here we focus on the press-pack GCT with a hermetic structure that can be expected to have a long lifetime and report on some of the applied technologies and their application.