Analog signal processing for photovoltaic panels grid-tied by Zeta converter

In this paper it is presented a detailed description of the analog implementation of the control for a DC-AC converter composed by a DC-DC Zeta converter and a low frequency inverter. Using only analog components, it was developed the MPPT technique based on linearization of solar panel characteristic around the MPP, a feedforward control and a robust PWM sine wave modulator. This simple and low cost solution was designed to be used in grid connected rooftop photovoltaic panels (PV). In scenery where an entire city area could be used to generate extra power, reducing the necessity of huge central power plants, module integrated inverters will play an important role on grid connection of PV systems with high reliability due to the high level of redundancy. The experimental results show that this simple cost effective solution is able to extract maximum power from PVs with low current harmonic content.