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Renewable power generation sources are imposing new operational challenges for power systems around the world. The traditional passive operating conditions may change since the power flow can reverse its direction under certain conditions. When the penetration of distributed generation is low, the effects comprise only distribution system. On the other hand, high distributed generation penetration...
As the penetration of renewable energy sources occurs, the power system configuration becomes more complex due to the intermittence of these generation sources. Thus, this paper studies the influence of renewable sources generation in the behavior of voltage collapse indexes. The system load margin is also addressed and the different operating scenarios allow one to analyze how the critical buses...
Power system blackouts harm economic activities and worsen the customers' welfare. Smart grids' self-healing capacity is an important feature for future power systems and it should also include the ability to manage the distributed energy sources to ensure electricity supply for a long time. This is required because the blackout duration is unknown and buck power system blackstart is a complex task...
Power losses minimization is a goal for electricity utilities and distribution system reconfiguration is one of the available tools to accomplish it. Reconfiguring the network means altering its topology by changing the status of normally opened and normally closed switches. Besides power losses minimization, network reconfiguration also helps on load balance and service restoration. This paper proposes...
This work deals with the application of Artificial Immune Systems (AIS) in distribution systems. Based on natural immune systems, these systems present some important characteristics that may be useful in optimization of power systems operation and planning. In this paper, such a technique is enhanced by tangent vector to help the search solution, so the optimization process is accelerated. The tests...
This paper proposes a method to block voltage regulator action with the meaning to enlarge a system load margin. Local control actions seem to be effective for this purpose, but are dependent on the existence of local sources. On the other hand, sharing the voltage control with the help of multiple machines-control provide good results, which is associated to a secondary voltage control strategy....
The use of renewable energy sources is escalating every year. Thus, there is an increase of smaller generating units connected directly to distribution networks close to demand consumption, designing micro-grids. These sources must provide the power quality required to ensure the stability and reliability of the power system. Several studies are demanded to ensure system operation in a secure manner...
This paper presents a methodology to deal with voltage stability and system loss reduction in distribution systems. In order to come up with sensitivities indicators, the Newton method must be employed, and a rotation in the data is executed. Then, the buses most indicated to experiment shunt compensation for active and reactive loss reduction and voltage stability prevention are identified. The tests...
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