Variable universe fuzzy controlled incremental conductance MPPT for Z-source PV inverter

Abstract

Abstract-Maximum power point tracking (MPPT) is always a hot research area for photovoltaic (PV) system. In this paper, based on high efficiency Z-source PV inverter, a variable universe fuzzy controlled incremental conductance (Inc-Cond) is proposed for MPPT. After designed fuzzy sets and rules, parameters of exponential-type and proportional-type stretching functions are investigated in detail. The influence to system performance are also analyzed. Corresponding simulations of Z-source PV system are implemented in MATLAB/Simulink. Simulation results show that the selection of parameter values has significant impact on system response speed and steady precision. Finally, an example is given to verify the feasibility of proposed MPPT algorithm. Compared with conventional fuzzy controlled Inc-Cond, voltage and power of PV array are more stable during MPPT. Inverter output voltage is stable and its THD is approximate 0.86%.

MPPT Control of a Solar Pumping System Based Five-Phase Impedance Source Inverter Fed Induction Motor

“…The PV array is operated at maximum power point at the different values of temperature. These results are given in Figs (11) to (16) to again prove the validity of the proposed method of control.…”

“…It can be noticed from Fig (11) that the effect of changing the temperature on the values of modulation index and the reference frequency is small. This is expected because the effect of temperature on the PV-array maximum power point is small as shown in Fig (12).…”

“…The impedance source inverter has many advantages, such as superior efficiency and compact structure. The impedance source inverter is preferred over conventional two-stage inverters because of its fewer power devices [11,12].…”

MPPT control of a solar pumping system based five-phase impedance source inverter fed induction motor

“…The impedance source inverter has many advantages, such as superior efficiency and compact structure. The impedance source inverter is preferred over conventional two-stage inverters because of its fewer power devices [ 15 , 16 ].…”