MPPT Control of Photovoltaic Systems Using Statechart With Abstraction and Its Comparison With Fuzzy Logic

摘要

Maximum power point tracking (MPPT) control is an indispensable aspect of photovoltaic (PV) systems. Many MPPT techniques including a few based on soft computing have been employed earlier. The soft-computing techniques include fuzzy-FSMs (finite state machines), which are integration of fuzzy logic (FL) into states or transitions of FSMs which are used for control and modeling of realtime systems. However, FSMs pose certain disadvantages as compared to its advanced variant called 'statecharts'. In this work, statecharts with abstraction layers are proposed for MPPT control of PV system. An abstract-statechart MPPT (ASM) controller is developed and is verified with PV system using co-simulation. A C++ based FL MPPT program is also developed, which is independent of any predefined and simulation-only functions. A conceptual estimation of execution time of such a FL MPPT program is presented and compared with the execution times delivered by proposed ASM controller. It can be observed that the ASM controller gives accurate, fast tracking speeds, along with the advantage of abstraction.