A Maximum Power Point Tracking Control Scheme for PV System Based on Power Equilibrium and Its System Design

Abstract

Since maximum power point tracking (MPPT) control is useful to realize an efficient PV system, many papers on MPPT scheme have been proposed. In most cases, they basically depend on so-called mountain climbing method which depends on the information of output power of PV array. Authors previously proposed a new MPPT control scheme for PV system connected in parallel with the ac system line. The system also depends on mountain climbing method. However, it needs no sensors or calculation for PV array power detection, and utilizes an interior control signal of dc link voltage control loop itself. For this reason, system response and stability greatly depend on the main circuit and control system parameters. This paper shows system design to ensure well-damped stable operation and fast response based on system analysis. Response of the experimental system has been proved fast enough for practical use.