Abstract
   In this work, it was designed and implemented an energy conversion system based on a single-phase inverter for an application in the context of microgrids. Currently, these kinds of systems have a high impact, in the new strategies of power generation, and its base is focused on distributed generation. Basically, generating units and loads are considered as an autonomous system, it is capable of operating in island mode or connected to the grid. With this new scheme of power generation, it is necessary to implement systems that can inject energy to the grid and provide energy to isolated load, in environments of renewable energy sources; such systems are known as microgrids and in the context energy conversion systems are very important. The main objective of this new generation strategy is that the energy that is supplied to the load more efficiently, which is achieved by approximating the generation centers to consumption sites. Regarding the environment, the use of microgrids increase the implementation of alternative systems based on renewable energy, thereby reducing emissions of greenhouse gases that cause climate change.
   Moreover, with this new energy generation strategy can be achieve a more secure supply, since in case of the grid failure the system can be reconfigured to maintain the continuity of service charges, ensuring the quality of supply, by maintaining both the waveform, amplitude and frequency of the voltage applied to the load.
   In this context, it was conducted a study, an analysis, an design and the implementation by means of simulations and experimental tests of different control techniques based on: proportional-integral controller (PI), proportional controller plus resonant controller (P+CRes), proportional integral plus resonant controller (PI+CRes), proportional integral plus repetitive controller (PI+CR). Particularly, the control technique P+CRes was used in the current loop and the other techniques were used in the voltage loop. Stressing the application of two novel control configurations, based on one of two degree of freedom plus repetitive controller scheme (2DOF+CR) and PI-P controller plus resonant controller scheme that island mode operation of the inverter allowed maintain the characteristics of the voltage signal to be supplied to the load effectively. With these control configurations was maintained the amplitude, waveform and frequency of the voltage signal.
   Finally, droop schemes were implemented through simulations for the active and reactive power control required by the loads; this application allows to emulate the behavior of power generators, which decrease in both the frequency and amplitude voltage signal, when the active and reactive power consumed is increases. With these control schemes is achieved that several inverters connected to the microgrid, working to the voltage sources can operate in parallel, without interfering with each other and provide to loads the active and reactive power, dividing the power supplies by each inverter.