ABSTRACT
Distributed generation (DG) can be operated to control voltages and power flows within the distribution system. Improvements in distribution system reliability and overall power system efficiency can be realized. DG provides a means for increasing the capacity of existing distribution facilities. When considering increasing distribution system capacity, DGs can be an alternative to new substation addition and replacing existing equipment with larger ones. A DG installed at the distribution level releases capacity throughout the system, from transmission through distribution. A DG operates basically in two modes in regard to being connected to the utility grid. In parallel mode, the DG remains connected to the grid. The challenge of DG control is to implement the control without having to install measurement or monitoring equipment throughout the many miles of distribution circuits. The aggregate control negotiates with the International Organization for Standardization (ISO). When the negotiation is complete, the ISO informs the aggregate control of the total desired real and reactive generation.
