A novel high-performance utility-interactive photovoltaic inverter system

Abstract

Abstract-This paper presents a novel photovoltaic inverter that can not only synchronize a sinusoidal ac output current with a utility line voltage, but also control the power generation of each photovoltaic module in an array. The proposed inverter system is composed of a half-bridge inverter at the utility interface and a novel generation control circuit which compensates for reductions in the output power of the system that are attributable to variations in the generation conditions of respective photovoltaic modules. The generation control circuit allows each photovoltaic module to operate independently at peak capacity, simply by detecting the output power of the system. Furthermore, the generation control circuit attenuates low-frequency ripple voltage, which is caused by the half-bridge inverter, across the photovoltaic modules. Consequently, the output power of system is increased due to the increase in average power generated by the photovoltaic modules. The effectiveness of the proposed inverter system is confirmed experimentally and by means of simulation.Index Terms-Maximum power point tracking control, photovoltaic module, photovoltaic power generation, utility interactive inverters.

Transformerless topologies for grid-connected single-phase photovoltaic inverters

“…Half bridge with GCC [34] is based on a half-bridge inverter with two more additional transistors, which makes it possible the independent maximum power point tracking of the photovoltaic strings [35]. A schematic of this topology is depicted in Fig.…”

A Single-Stage Single-Phase Transformer-Less Doubly Grounded Grid-Connected PV Interface

“…Several researchers have worked with the PV-fed gridconnected, transformer-less dc-ac inverter topologies [15]- [18], [20]- [22] and the issues related to their operation [23], [24].…”

“…2(b) utilizes generation control circuit (GCC) [18], which comprises two switches (S 1 and S 2 ) and an inductor L. With GCC, MPPT can be applied to both the PV strings independently. The disadvantage with the configuration is that it is inherently a half-bridge, exhibiting buck characteristics.…”

“…This topology uses minimal number of devices. However, during positive [17], [18], [20]. (d)-(e) Configurations with single PV source [21], [22].…”

Modelo matemático de sistemas fotovoltaicos para búsqueda distribuida del punto de máxima potencia

“…El método centralizado tiene como principal cualidad el uso de un solo controlador MPPT y de un solo convertidor de potencia CC/CA, lo que reduce sus costos en comparación con el DMPPT [12]. Pero, el convertidor CC/CA requerido por el sistema centralizado involucra una complejidad mayor de diseño, esto debido a sus múltiples funciones: elevar la tensión de los PV al nivel requerido por el inversor (CC/CA) y ejecutar las acciones requeridas por el algoritmo MPPT [14].…”