The book is intended for students as a textbook for laboratory classes on the course of the same name in the mathematical package Mat. Lab+Simulink. The first section of the tutorial provides general recommendations for performing virtual laboratory work, brief recommendations for working with the mathematical package Mat. Lab+Simulink. The second section of the manual includes the study of almost the entire spectrum of power converters, both on the basis of traditional power keys (thyristors) and using IGBT transistors. The training manual is intended for students of higher educational institutions , students in the direction of "Agroengineering" in the framework of training bachelors in the profile "Electrical equipment and electrical technologies in agriculture" and the direction "Electric power engineering and electrical engineering" , profile "Power supply". Can be recommended to students on the profile "Technical systems in agribusiness" and "Enterprise energy supply". It will be useful to engineering and technical workers specializing in the field of adjustment and operation of electronic components and assemblies of electrical equipment and automation equipment.