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.