This doctoral thesis is dedicated to development of control means for intelligent distribution grids, such as contemporary households with installed renewable energy sources. Integration of energy management system allows implementing better functionality, higher efficiency of energy utilization and stability for the end-user. The main contribution has been made in the field of energy management systems introducing multifunctional interconnection switch with integrated nonintrusive load monitoring algorithm, for which multiple solutions were proposed in order to enable disaggregation of energy generated from renewable energy sources. The algorithm of electrical energy price estimation in an intelligent distribution grid based on load categorization has been described. This algorithm enables long-term power balancing, when local grid operates autonomously, and demand-side management, when it is connected to utility grid. Introduction of DC subgrid has been discussed in order to improve energy efficiency, where bidirectional AC/DC converter based on double half-bridge topology with common neutral point has been proposed as a common point interface converter between AC and DC subgrids. The current sensorless control algorithm with constant switching frequency has been described and tested for rectification, grid-tied and stand-alone inverter modes both for discontinuous and continuous current modes, also defining current limits that could be used for adaptive hysteresis current control algorithm operating at nearly constant switching frequency if the current sensor is used. The thesis is written in English language on 114 pages, and consists of an introduction, 4 chapters and conclusions, and 8 appendices. 88 figures, 124 formulas, 11 tables, and 91 references are included in the thesis.