Podnebennaya S. Improving the Energy Efficiency of Electrotechnical Complex Comprising of Nonlinear Load and Shunt Active Power Filter in 0.4 kV Networks

Object - electromagnetic processes in the electrical network, which are due to the work of non-linear load with power active filter; purpose - improving of energy efficiency electrical complex "non-linear load - power active filter"; methods - fundamental of electrotechnics, theory of linear and nonlinear circuits, direct and inverse Fourier transforms, theory quadripoles, spectral methods for calculating circuits, frequency stability criteria, the mathematical apparatus of the analysis and synthesis of impulsive systems of automatic control; evaluation methods of power losses in voltage inverters; novelty - further developed a method of increasing the energy efficiency of electrical complex "non-linear load - power active filter", which consists in the fact that the power loss in the network reduced by reactive power compensation and power distortion, characterized in that the power loss in the power active filter complex reduced by reduce the switching frequency of the inverter power switches; improved automatic control system for the active power filter complex "nonlinear load - the active power filter" by the active regulation of error correction of the output current of the filter by introducing an additional correcting link in the form of a controllable source of EMF proportional regulator connected in series with a capacitor filter and interface covered negative feedback output current filter; first developed a method for control of power active filter with an additional corrective link using main inverter control system with consistent correction based on fast Fourier transform and the system with negative feedback for further correction link, allowing to provide high performance while minimizing power filter additional correction link; Further developed method adaptive systems control power active filter with additional corrective link to change the filter inductance interface and network connection point of the active filter, which consists in an iterative selection coefficients for sequential correction condition for a minimum of additional corrective power management, allowing to reduce the power loss in electrical complex "nonlinear load - power active filter" and the mains. Industrial development in the testing conditions by companies "Gorsvet" and "Chermetavtomatika Mariupol" confirmed its effectiveness for industrial use and supported by relevant acts. The results of the thesis can be used in the design of devices to improve the quality of electricity to 0.4 kV networks in the educational process.