Abstract

In recent years, interest in natural energy has grown in response to increased concern for the environment. Many kinds of inverter circuits and their control schemes for photovoltaic (PV) power generation systems have been studied. A conventional system employs a PV array in which many PV modules are connected in series to obtain sufficient dc input voltage for generating ac utility line voltage from an inverter circuit. However, the total power generated from the PV array is sometimes decreased remarkably when only a few modules are partially covered by shadows, thereby decreasing inherent current generation, and preventing the generation current from attaining its maximum value on the array. To overcome this drawback, an ac module strategy has been proposed. In this system, a low-power dc–ac utility interactive inverter called microinverter is individually mounted on each PV module and operates so as to generate the maximum power from its corresponding PV module. This paper presents an isolated solar microinverter with pseudo-dc link.High conversion efficiency and high maximum maximum power point tracking accuracy can be achieved with the studied pseudo-dc link topology

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