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This paper presents the consequences and operating limitations of installing distributed generation (DG) in electric power systems. The proliferation of new generators creates new operating conditions, some not seen before, that are limited by fault interruption capability. Increased system fault currents resulting from DG installation and the effects of increased fault currents on operating economics is discussed. A technique used to evaluate the unit commitment (UC) with fault level constraint after installing DGs is analyzed, and an example is given.

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This letter contains the analysis of the increase of fault current due to the installation of distributed resources or merchant plants. An index called the average change of fault (ACF) current is proposed. The ACF can be applied to indicate the contribution of the increase of fault current and to allocate the responsibility of system upgrades among the owners of distributed resources.

This paper proposes a new technique to design a fixed-structure robust controller for grid connected three-phase inverter systems. The proposed technique applies the Genetic Algorithm to evaluate the optimal controller parameters. The integral squared error (ISE) of the controlled system is minimized and the robust performance (RP) of the system is satisfied. In the proposed design, the structure of controller is specified as a decentralized Proportional- Integral (PI) controller which is preferred for practical implementations. Simulation results show that the proposed technique is promising. Applying the proposed technique ensures wide operating conditions for three-phase power inverters.