Ripple correlation control (RCC) is a high-performance real-time optimization technique that has been applied to photovoltaic maximum power point tracking. This paper extends the previous analog technique to the digital domain. The proposed digital implementation is less expensive, more flexible, and more robust. with a few simplifications, the RCC method is reduced to a sampling problem; that is, if the appropriate variables are sampled at the correct times, the discrete-time RCC (DRCC) algorithm can quickly find the optimal operating point. First, the general DRCC method is derived and stability is proven. Then, DRCC is applied to the photovoltaic maximum power point tracking problem. Experimental results verify tracking accuracy greater than 98% with an update rate greater than 1 kHz.


Electrical and Computer Engineering

Keywords and Phrases

Maximum Power Point Tracking (MPPT); Optimization; Photovoltaic (PV); Concrete Dams; Continuous Time Systems; Digital Arithmetic; Electric Inverters; Optical Flows; Pumps; Sampling; Correlation Controls; Digital Domains; Digital Implementations; Optimal Operating Points; Sampling Problems; Time Optimizations; Tracking Accuracies; Update Rates; Photovoltaic Effects

International Standard Serial Number (ISSN)


Document Type

Article - Journal

Document Version

Final Version

File Type





© 2008 Institute of Electrical and Electronics Engineers (IEEE), All rights reserved.

Publication Date

01 Sep 2008