The present invention provides a scalable cascaded Z-source inverter configuration that can integrate distributed renewable energy sources/storages with wide voltage range. Single energy conversion and boost function can be achieved simultaneously. Independent maximum power point tracking for each Z-source inverter module can implement an efficient photovoltaic energy conversion. The commercial low voltage gallium nitrite (GaN) device can be used to facilitate modular structure due to ultra-high frequency, small size AC filter and DC electrolyte capacitor, which reduces losses significantly and achieves high power efficiency. The present invention is immune to shoot-through faults especially operating at high switching frequency and enhance the system reliability. A comprehensive Z-source network design has been developed based on an innovative equivalent AC circuit model for the single phase photovoltaic system. Flexible and reliable control system integrated is developed to improve the photovoltaic energy harvesting capability. In particular, the invention is also suitable for hybrid renewable energy sources/storages application in wide system operation range. And high power density, high power efficiency, high power quality and high system reliability can be achieved. The scalable cascaded Z-source inverter is able to interface flexibly different distributed renewable energy sources or storages in wide voltage change range, such as wind power, solar power, battery, fuel cell, Ultra-capacitor and so on. The invention facilitates the AC 1MHz frequency output; therefore high power density can be reached. Z-source network is integrated in each inverter module to wide system operation range, improve high system efficiency, and enhance high system reliability. The invention is applied for photovoltaic system to verify the performance and should allow the grid-connected photovoltaic systems to realize its full market potential .
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