Experimental Study of Non-sinusoidal Operating Mode of Workshop Power Supply System in Dynamic Vibrating Formation of Concrete Mixtures
The article presents the results of experimental studies of operating modes of a workshop supply systems containing power-consuming equipment with non-linear current-voltage characteristics. In the production of concrete units using a conveyor system, we use modern frequency electric drive based on asynchronous motors with squirrel-cage rotor. Along with the optimization of technological process of concrete unit manufacturing, the actuator is a source of higher harmonics of current and voltage in the electrical system of the plant. The experiments were conducted using certified devices Chauvin Arnoux 8335 and Energomonitor-3.3Т1 (certification is confirmed, the certificate of calibration devices №008013, №008014, certified on 28.04.2016). The measurements were performed continuously for three days with registration of data every minute. Connection was implemented to the three-phase four-wire network in accordance with the program of experimental studies approved by the main specialists of the enterprise. The results are presented in the form of tables, graphs and histograms of measurements. The authenticity is confirmed except the systematic and random errors in the measurements according to the standard requirements. Experiments confirm the presence of higher harmonics of current and voltage in the power system of the workshop. This total harmonic components of voltage reaches a critical value and, depending on the operating conditions of the conveyor reaches more than 8.5%, which indicates the need for the application of technical means for their compensation. To solve this problem, it was proposed to use active filters or hybrid control systems taking into account the cyclical nature of the process