Study Of Transient Stability For Ieee 14 Bus Power System

​The main purpose of the wind energy is to create energy source which is pollution free and come with a reasonable price. The wind energy used in wind turbines are increasing their demand and becoming popular in the green energy world. Since the rebirth or rapid growth of wind energy took place from early 1980. The growth of the industry has been more than expectations. As all the good things the wind energy poses certain negative impacts of having high maintainer cost. Repair and data collection should be monitored regularly of the turbine to get the idea of placing a new wind energy plant or to maintain the old one. This paper explains the modeling of Wind Energy Conversion Systems and their technologies which is used for the generation of wind power and control strategies of the conversion system.

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

Optimum use of renewable source of energy like Wind can be considered as one of the answer to rapid increase in the demand of energy worldwide. Using the current technological advancements it is commercially viable to use the wind power as a source of energy for small scale to large scale industry.All kind of renewable source are highly dependent on environmental conditions and can not be controlled fully. Due to this inherent characteristics, power generation may vary. In the

The dissertation is divided into three main parts. In the first part, we proposed the hierarchical communication network architectures that consist of a turbine area network (TAN), farm area network (FAN), and control area network (CAN) for WPFs. The wind turbines are modelled based on the logical nodes (LN) concepts of the IEC 61400-25 standard. The WPF communication network is configured with a switch-based architecture where each wind turbine has a dedicated link to the wind farm main switch. Servers at the control center are used to store and process the data received from the WPF. The network architecture is modelled and evaluated via OPNET. We investigated the end-to-end (ETE) delay for different WPF applications, and our network architecture is validated by analyzing the simulation results.

There two ways to stabilize power supply, first approach is a Corrective approach, where new power stations are built, existing infrastructures are upgraded and new maintenance plans are developed and followed. This approach is a

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

Abstract—This paper presents a voltage and frequency control of wind-hydro hybrid system in isolated locations in which one squirrel cage induction generator (SCIG) driven by a variable speed wind turbine and another SCIG driven by a constant power hydro turbine feeding three phase four wire local loads. The system mainly uses a rectifier and a pulse width modulation controlled insulated-gate-bipolar-transistor-based voltage-source converters (VSCs) with a battery energy storage system at their dc link. The main objectives of the rectifier is to convert the ac power generated by the wind system to dc and the control algorithm for the VSC is the control of the magnitude and the frequency of the load voltage. This system has the capability of bidirectional active- and reactive-power flow, by which it controls the magnitude and the frequency of the load voltage. Here pitch angle control is used to achieve maximum power tracking(MPT).In this paper wind turbine, hydro turbine, MPT controller, and a voltage and frequency controller are modeled and simulated in MATLAB using Simulink and Sim Power System set toolboxes, and different aspects of the proposed system are studied for various types of loads, and under varying wind-speed conditions. The performance of the proposed system is presented to demonstrate its capability of MPT, voltage and frequency control (VFC), harmonic elimination, and load balancing.

This chapter proposes a hybrid stability assessment method, i.e., combine both time-domain and direct methods, for detection, classification and assessment of the transient and small signal dynamic stability. The proposed energy function in chapter 3 is used to calculate the system energy. Then, the overall system energy is compared to the sum of the critical energies of the critical series components which can be determined using the proposed time-to-instability index. The HVDC system impact on the system stability assessment technique is also discussed. A termination criterion for stable cases is proposed to expand the proposed method capability to the dynamic security

Microgrid as an aggregator manages power scheduling of DERs and RESs to serve sustainably and reliably through energy management system (EMS) [4], [5]. Employing EMS, microgrid not only alleviates undesirable impacts of intermittencies pertained to RESs, DERs and load, but also provides secure energy services according to smart grid provisional objectives [6],[7]. EMS is in charge of synchronization with the main grid, voltage and frequency control through power balancing and preserving secure operational margins [8],[9],[10],[11],[12].

Reactive power in a power system is important to maintain or support the voltage to deliver the active power demanded by the load side. Synchronous generators are the main source of reactive power in most of the power plants. The reactive power capability of the generator is the amount of the reactive support produced at the rated generator terminals. The capability of these generators are represented by capability curves that are published by the manufacturer based solely on the thermal limitations as shown in figure-1. But in the real world, when the generator is employed in a power plant, its reactive capability is much less compared to that of published generator capability due to several design and operating constraints of the plant. This forms the basis to determine the reactive capability of the generator operating in the power plant.

Figs. 8(a-c) show the generated stator, rotor and total active powers respectively. Total active power is identical to the estimated power curve in Fig. 2. Fig. 9 shows the stator reactive power while the rotor reactive power is taken from the DC bus system. The RSC has large size with the lead power factor (Qs= -1.6 MVAR), otherwise, all lag power factors have smaller RSC size.

The development of power electronics devices such as Flexible AC Transmission System (FACTS) and customs power devices have introduced and emerging

Abstract: A hybrid generation is a part of large power system in which number of sources usually attached to a power electronic converter and loads are clustered can operate independent of the main power system. The protection scheme is crucial against faults based on traditional over current protection since there are adequate problems due to fault currents in the mode of operation. This paper adopts a new approach for detection, discrimination of the faults for multi terminal transmission line protection in presence of hybrid generation. Transient current based protection scheme is developed with discrete wavelet transform. Fault indices of all phase currents at all terminals are obtained by analyzing the detail coefficients of current signals using bior 1.5 mother wavelet. This scheme is tested for different types of faults and is found effective for detection and discrimination of fault with various fault inception angle and fault impedance.