IMPACT OF DISTRIBUTED
GENERATION OVER POWER SYSTEM
Prof Celso L. Fortoul P., PhD.
Prof Carmen Pahmer Dr,
Prof Alberto Urdaneta PhD.
Caracas, U.C.V. Engineering Faculty. Electric Engineering School, Year 2008.
Key Words: Distributed generation, dynamic behaviour, power system
Abstract. A confluence of electric power industry restructuring supply, intensive technological development, public environmental politics,
expansion on the financial and electrical market, are some of the factors driving new conditions so that the industry of the electric power
supply uses a new approach: distributed generation. This is an electrical energy source connected to the power system, in a very close point
or in a near location of the consumer side, or in the network side, which is sufficiently small compared with the centralized power plants. The
main objective of this doctoral thesis is to evaluate the impact that the integration of distributed generation has on the behaviour of the power
system using a qualitative approach. Initially, the operation and the relevant characteristic of each one of the technologies of distributed
generation (photovoltaic systems, wind systems: fixed and variable speed, thermal machines: gas turbine, micro turbines and fuel cells) were
established. The models adapted for the simulation of the dynamic behaviour and transitory stability has been developed, and the means
have been formulated to integrate them to the power system. A computational program was developed with partitioned implicit approach to
calculate stationary and dynamic behaviour. There has been carried out a discussion that defines possible integration sceneries of distributed
generation as well as qualitative and quantitative indicators. Numerical simulations were developed on a test network, to exanimate the
stationary and dynamic behaviour, for several attributes. A detailed examination was completed on: power losses, voltage control, voltage
stability, generation-demand balance, short circuit current and transient stability. Results obtained allowed to conclude that the impact of the
distributed generation depends so much of penetration level and type of technology. If the distributed generation is adequately sized, located
and selected in terms of the technology, this can clearly, provide a benefit to the control, operation and the dynamics of the power system.