Massive effective integration of renewable energies into the electric grid is an issue in almost all electric power systems. These renewable energy sources (RES) are usually based on wind and solar photovoltaic generation and cannot maintain a power reference due to variations in wind and solar irradiance.Currently the integration of these renewable energy sources is possible in strong power systems due to the support of the conventional power plants which maintain the stability of the power system.In weak networks instead, the massive integration of renewable generation systems could generate stability problems to the power system, so they are being required to provide grid support functions as voltage control and frequency control by the new regulations. Moreover, in order to reduce the uncertainty introduced by these RES, some governments are also compelling these RES to reduce the uncertainty of their generation. The main goal of this is to transform the behavior of the current uncontrollable RES to stable and predictable generation, converting it from variable and unpredictable generation into dispatchable generation. But to achieve this goal the RES have to be supported by Energy Storage Systems (ESS).In this paper two different representative regulatory requirements will be described, analyzing the philosophy of them and proposing solutions to face up to these new requirements, taking into account several factors as the location, efficiency of the equipments, and other technical issues. PV Model + -PCS Model MV Grid Auxiliary Consumption Energy Storage Model PV Panels Model PCC EMS State of the power plant
In rural distribution networks with widely dispersed loads, characterized by the utilization of long overhead lines, voltage profiles with big variations appear along the line due to the significant variations of the load between peak hours and valley hours.This paper describes the problems that the integration of distributed generation based on renewable resources could generate in that scenario, and presents solutions that are commonly used to mitigate these problems and proposes new solutions to solve them.The integration of distributed generation (DG) based on renewable resources in these networks increases the variability of the voltage, and in some cases the power flow of the network also can be bidirectional. Usually this integration of distributed generation is limited by the network operator limiting the maximum voltage variation produced by the distributed generation in the point of common coupling (PCC).In this paper different traditional methods for voltage control are described and analyzed for a widely dispersed rural network scenario.The impact of the DG in these methods of voltage control and the advantages of power electronics in this new scenario are exposed. Power Electronic devices applied to these distribution networks allow more efficient management of the network increasing the integration of distributed generation maintaining the security levels.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.