Complex Modeling of Autonomous Power Plant Operation with Variable Speed Engine Generator and Energy Storage

Improving of fuel economy and environmental safety in power generation is a topical issue of modern off-grid energy. One of the ways to solve this problem is the usage of motor-generator unit with variable speed regulation, introduction and exploitation of renewable energy. However, these methods require the use of additional electric power converters. The article concentrates on problems relating to the design of stand-alone energy systems, which based on these power converters using mathematic simulation. The paper describes complex mathematical model of autonomous power plant, which consist of motor-generator plant with variable speed regulation and electrical energy storage, also there is a mathematical description of the main components of the system. A distinctive feature of the proposed model is modeling approach of operating modes of variable speed genset, which represented synthesis of multiparameter characteristics at valid loads of the internal combustion engine and the system of equations for electromechanical energy conversion of an electric generator. With the assistance of model were made analysis of electrical, energy and environmental performances of autonomous power plant on change of electrical load, also the operating modes of an internal combustion engine in transient modes were shown.