Voltage Instability Problems Play Power Systems Planning And Operation

A Power system is an connection of generators to load centres. Through H.V. electrical lines & in general is controlled mechanically. It can be divided into 3 subsystems: Generation, X’mission and Distribution-systems. The electric power demand is Growing and building of new generating units & transmission circuits is becoming difficult because of environmental & economic reasons. So, power utilities are forced to depend on utilization of existing generating units and to load existing lines close to their heating limits.

The intricate and connect power grid system that is linked and stretched out to over 200,000 of high-tension transmission lines, which supplies the power we depend so heavily upon. What exactly does it take to keep this system working reliably? In a control room On August 14th, 2003 in New Albany, New York the board that monitors the grid throughout New York with bulbs that light up when a transmission line connection had been lost was light up all over. With a system that is almost always reliable what could cause this chaos

Our society today is ever more dependent upon electricity in all aspects of life. Keeping the power infrastructure throughout the United States secure and functioning properly should be considered a high priority for both private sector and government. Lacking properly functioning power caused by an outage has widespread impact not just on common conveniences being unavailable but also on critical areas such as emergency services, transportation, water distribution, communication and food production and storage.

A power system is always in a state of disturbance that may lead to instability in the system. The consequences of a major power supply interruption can prove to be so disastrous, that every effort must be made to reduce the impact of such a disturbance. The process of determining the steadiness of the power system following any upset is known as security assessment. In particular, MW security assessment is a process to evaluate the security of the power system following a disturbance. It is done considering the loading conditions in respect of MW power flow on the lines. Each line has a capacity to carry MW power up to transmission line design limits beyond which the lines may trip due to overloading. In this paper MW security assessment has

The power system is installed within 5 electrical substations with emergency equipment, generators, medium voltage panels and transformers.This installation makes the power distribution to Petrobras Headquarters UOBS, which currently controls its offshore operation units (oil platform).The power system is divided into the following subsystems:

The DVR is one of the most common and effective solutions for protecting critical load against voltage sags [10] [11]. The DVR is a power electronic device used to inject three-phase voltages in series and in synchronism with the distribution feeder voltages in order to compensate for voltage sags. Moreover, it can be efficiently used to augment the fault ride through capability in wind applications. Detection time is an important factor in the voltage restitution process. Fast detection

In the wake of Northeast Blackout, Northeast Power Coordinating Council(NPCC) was formed in 1966, and comprised

The JV partner Engie Energía Chile S.A. (“EEC”) (BBB/BBB; SFS Equivalent 4-), is a subsidiary of Engie S.A. (Engie) (A-/A2/A-; SFS Equivalent 3-), and Red Eléctrica Chile (“REC”), subsidiary of Red Eléctrica Corporación S.A.U. (A-/Baa1/A; SFS Equivalent 3-). Both partners have significant experience in operating and managing a transmission grid. The risk designation of “Neutral/Standard” corresponds to the 4- equivalent

Using Matlab, it was possible to accurately simulate the voltage profile of the sample distribution feeder using an iterative process. After simulating several various scenarios, some apparent problems arose. In any of the simulated cases, without the use of a voltage

 In a deregulated market there is a need for a new kind of voltage and power flow control

To halt the drop in frequency, it is necessary to intentionally, and automatically disconnect a portion of the load equal to or greater than the generation deficiency in order to achieve balanced power economics while maintaining system stability. Automated load shedding systems are necessary for industrial power systems since sudden disturbances can plunge a system into a hazardous state much faster than an operator can react. These automated schemes must be designed and implemented to possess in-depth knowledge of system operating parameters and must rely on time sensitive

Large-scale smart grid initiatives require fast and accurate monitoring of power system network. Phasor Measurement Unit (PMU) is one of the major components which are increasingly deployed in the power system network to provide the necessary infrastructure to cater smart grid requirements. PMUs provide time synchronized measurement of voltage and current phasors (Phadke and Thorp 2008) from different nodes of the power system network, which is used for monitoring and control. NASPI (March 2015) and NERC (September 2016) suggest use of phasor data from the PMUs to perform verification of dynamic models as well as validating parameters of power plant models. A parameter identification toolbox for power system models developed using the

The various nonlinear loads like Adjustable Speed Drives (ASD’s), bulk rectifiers, furnaces, computer supplies, etc. draw non sinusoidal currents containing harmonics from the supply which in turn causes voltage harmonics. Current harmonic causes increased power system losses, excessive heating in rotating machinery, interference with nearby communication circuits and control circuits, etc.

Abstract— The wind energy is the fastest growing renewable energy resource. The increasing wind power generation requires a careful evaluation of the transient stability of the grid. The impact of wind power penetration on the transient stability of a standard IEEE 14 bus system studied. Transient stability under three phase fault is investigated via simulation using PSAT on a MATLAB platform. Some part of the conventional generation of the standard system is replaced with DFIG based wind power generation and the system is analyzed for fault at different locations. Study shows that the system becomes vulnerable to instability with the addition of wind power generation.

Abstract -Power systems have increased in size and complexity and national society depends heavily upon a high level of power system reliability. When the bulk transmission system is subjected to large disturbances there is the possibility of a system wide blackout due to cascading outages. After a partial blackout or system breakdown condition, restoring power system is needed and then power needs to be restored as quickly, stability and reliability as possible and consequently. Outage time after extensive blackouts depends very much on the power system restoration process. Power system restoration is a very challenging task to the operator since the situation is so far from normal conditions. This paper proposes a simulation-based tool MATLAB/SIMULINK that determines suitable restoration transmission lines route with using Fuzzy Inference System for IEEE 6 Bus System