The main task of electric networks is providing effectively the needs of consumers in energy of the appropriate quality at minimum costs and sufficient level of reliability. This causes a constant increase in the size of the grids and the complexity of the structure. They have become the only complex for the transformation, stabilization of parameters and transport of electricity. At the same time, with the development of new technological processes, the share of asymmetric, nonlinear and dynamic consumers of electricity is continuously increasing. In practice, all this leads to the fact that in electricity networks such factors of distortion of the electricity quality as deviation, oscillation, asymmetry and non-linearity of voltage have become permanent disturbances. They significantly reduce the efficiency of both the power supply system’s themselves and consumers which are power supplied from them. In general, the principles of construction, development of modern and promising electricity networks, methods and means of controlling their regimes should be consistent with the level and pace of the overall progress of technology and technology.

Introduction 1.Classification of Source of Distortion in bulk electricpower Networks. 1.1 Abnormal resonance overvoltages in bulk electrical power systems with source of distortion 1.2 Abnormal resonance overvoltages at nonsinusoidal distortions 1.3 A physical reason of resonnant overvoltages on higher harmonic components 1.4 Evaluation of the sources distortion influence on the quality of electrical energy of electrical networks 2. Mathematical modeling of influence of different regions on electrical aplications, modes and losses in microgrid 2.1 The impact of renewable energy sources on the quality of electrical energy 2.2 Study of operating modes and parameters of SPS inverters on harmonie components in microgrid 2.3 Models of distribution electric networks with damaged high-voltage equipment 2.4 Optimal control of small hyroelectric plants power generation in local electrical systems 3. Automatic power and frequency control o f an electrical power systems with renewable energy sources 3.1 Analysis of the impact of renewable energy sources on the frequency of the electric power system 3.2 Power systems WAMS based analysis 3.3 Electric powe systems frequency control considering the limitations 4. Creating of Microgrids to ensure the reliability of power supply of enterprises 4.1 Development of promising means and methods for efficient control of microgirds based on distributed energy sources 4.2 Establishment of industrial microgrids using alternative energy sources 4.3 Improvement of the gas generator boiler structure 4.4 Analysis of electricity generation efficiency based on solar energy in Vinnitsa region Conclusions References