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The biggest challenge in the contemporaneous world: maintain the supply of electric energy with reliability and quality. A lot of technological solutions, involving telecommunications, energy storage, dispersed generation (DG) with alternative sources and another usual electric generation, are in large scale implementation. Moreover, Microgrids (MG) concept is in large discussion in order to obtain better results in operation and management of this new distribution system. Local black start strategies are one of the most important implementation for that new kind of grid. In the first phase of the R&D project developed with CPFL, one Brazilian electric utility, inside of the environment of ANEEL, the Brazilian Regulatory Agency to the electric system, it was made a study concerning the technologies of distributed micro generators and connection requirements. Models and control strategies simulations have been done in order to reproduce the performance of this energy sources when connected in the grid during the practice tests. It was evaluated topologies with resistive loads, capacitive loads, and inductive/non-linear loads. These topologies are in parallel with the distribution utility grid using a special test bench able to synchronize the energy and power quality measurements of all devices.

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Global growth of distributed generation, especially photovoltaic, has given rise to new markets and new problems: large injection of power at daily intervals without increasing in the level of consumption. This scenario has already created, in certain places, overvoltage problems, harmonic distortion, etc. In Brazil, the standards regulate the connection of photovoltaic inverters, however, the control is not yet subject to standardization. For this reason, this paper presents a proposal of local and central algorithms for this power injection control in accordance with the solutions of problems such as the lack of standardization in the communication protocol of the inverters. The results of the pilot plant application are also presented.