This paper presents a flexible control technique for power electronics converters, which can function as an active power filter, as a local power supply interface, or perform both functions simultaneously. Thus, it can compensate for current disturbances while simultaneously injecting active power into the electrical grid, transforming the power converter into a multifunctional device. The main objective is to use all the capacity available in the electronic power converter to maximize the benefits when it is installed in the electricity grid. This objective is achieved by using the orthogonal current decomposition of the Conservative Power Theory. Each current component is weighted by compensation coefficients ( ), which are adjusted instantaneously and independently, in any percentage, by means of load conformity factors ( ), thus providing online flexibility with respect to the objectives of compensation and injection of active power. Lastly, simulated and experimental results are presented to validate the effectiveness and performance of the proposed approach.

This study discusses a centralized and coordinated control of distributed multifunctional inverters connected to an electric grid. The multifunctional operation is based on the conservative power theory, which makes it possible to identify undesired current components that can be compensated. The inverters that make up the microgrid are managed through a transmission control protocol/internet protocol (TCP/IP) communication network, allowing commands from a control center, while also allowing monitoring and gauging of electrical quantities of interest related to each of the inverters. Using the control center, it is possible to adjust the current necessary for compensation, which can be shared among inverters in a coordinated manner and according to their nominal capacities. Adjustments are made by sending references to certain indexes for desired power quality at the coupling point of each inverter. Experiment results explore some compensation alternatives, employing communication flexibility among the devices that comprise the microgrid. Index Terms-Conservative power theory (CPT), coordinated control, microgrids, multifunctional inverters, power quality (PQ). I. INTRODUCTION O VER the last decade, the electrical industry has made important inroads in the expansion of renewable energy sources (RESs). These advances contributed to the growth of

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AC power conditioners in electric power systems have been extensively explored in the literature based on approaches mainly focused on single-and three-phase wiring topologies, remaining a significant gap in regard to applications suitable for two-phase three-wire circuitry. Therefore, this work demonstrates that the Conservative Power Theory can be employed to generate the proper reference signals for an active power filter in two-phase threewire networks. This methodology allows to selectively synthesize reference signals in a flexible manner, providing reactive power compensation, mitigation of unbalance and harmonic currents, as well as contributing to the reduction of neutral current at point of common coupling. The proposed strategy, its implementation, and the control design of a threeleg active power filter are discussed in this paper through simulation results, demonstrating the particularities and advantages of this approach.