Abstract <p>The reliability of electromechanical energy converters is a key point for power supply systems with distributed generation, especially for remotely located ones. In this paper, the existing and advanced methods of protecting converters against emergency modes, including voltage unbalance, are analyzed. The physical principles underlying these methods and their application in various fields, including power engineering and control systems, are considered. Special attention is paid to factors causing voltage unbalance and its effect on equipment. The advantages and disadvantages of techniques for reactive power compensation, as well as methods for improving the efficiency of active and hybrid filters, are considered. Recommendations are given for optimizing protection systems used in distributed generation sources with regard to the interdisciplinary context and possible applications in related fields.</p>