Novel controllers are introduced in energy system research to alleviate the uncertainties of renewable sources. These have been modified to fit a solution formed in various ways. This article deals with voltage regulation of wind farms in situations of voltage dips in which communication failures occur. The objective is to discuss a modification of the online management system for wind farms. We focus on the voltage regulation of wind farms when communication failures occur in the online wind farm management system. The structure has been designed to respond to a voltage drop when the external reference is absent due to communication errors. A comparative analysis was performed with general control modes to demonstrate the relevance of the proposed method.