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In this paper, two generalized algorithms are presented for sizing and allocating distributed generation (DG) units. To determine the size and location of a single DG unit, a heuristic method based on sensitivity analysis and quadratic curve fitting technique has been proposed. Another heuristic technique based on a loss improvement index has been introduced for allocation of multiple DG units. These...
Unified Power Quality Conditioner (UPQC) can fulfil multiple power quality control objectives such as needs of reactive power compensation, voltage flicker and harmonics current compensation. However UPQCs are quite expensive and therefore are not widely used. In this paper the potential of Plug in Hybrid Electric Vehicles (PHEV) in a V2G mode of operation is explained, which gives a low-cost solution...
This paper proposes a distributed generator (DG) placement methodology based on newly defined term reactive power loadability. The effectiveness of the proposed planning is carried out over a distribution test system representative of the Kumamoto area in Japan. Firstly, this paper provides simulation results showing the sensitivity of the location of renewable energy based DG on voltage profile and...
Modified versions of betweenness and closeness centrality measures are proposed to identify and rank critical nodes in power systems. Power flows in various lines of a transmission system are taken as weighting parameters to calculate betweenness and closeness centrality measures. Changes in measures of impact like path length, connectivity loss and size of blackout are observed when nodes from the...
The HVDC converters used for rectifying or inverting operations absorb reactive power from the converters connected bus. Compensation of reactive power in AC side of converters is quite necessary in either case of operation. On the other hand the nonlinear behavior of power electronic converters produces harmonics in both sides of HVDC links. Passive and active filters are used to filter the harmonics...
A new model of power system to identify critical elements for smart and bulk power transmission grid environment is presented in this paper. Proposed bidirectional power flow model under complex network framework can quantify the criticality of nodes whose removal would trigger cascading failure. The proposed model based centrality, which is an extension of nominal power flow based model, is able...
Unified Power Flow Controller (UPFC) is a FACTS device which can fulfil multiple power flow control objectives such as needs of reactive shunt compensation, phase shifting and series compensation. However UPFCs are quite expensive and therefore are not widely used. In this paper the potential of Plug in Hybrid Electric Vehicles (PHEV) in a V2G mode of operation is explained, which gives a low-cost...
Bidirectional or two way power flow based centrality measure has been implemented in bulk and smart power transmission systems. Proposed model can identify critical nodes from the system whose removal would affect the system severely. A combination of two models has been adopted to capture the power flow scenario of smart grid. Impacts of removal of critical nodes have been analyzed in terms of increase...
This paper presents potential barriers to integrate the squirrel cage induction generator (SCIG) and doubly fed induction generator (DFIG) type wind turbine in distribution networks. The analysis is carried out over a 16 bus distribution test system. Both static and dynamic analyses are performed to see the impact of two different generators on the distribution system. The simulation results show...
In this paper, the modeling of the distribution network is done in a different way where the distributed generator and dynamic loads are considered. Based on this modeling, this paper presents an analysis to investigate the dynamic and static load variation effect on the distribution network. Graphical interface industry software is used to conduct all the aspects of model implementation and carry...
This paper present the effects of integration of renewable energy sources (RES) in a microgrid in grid connected and islanded operation. To analyze the complementary effect of renewable energy penetration into microgrid, a fixed speed wind turbine equipped with squirrel cage induction generator (SCIG) and a grid connected solar system with maximum power point tracker (MPPT) are used. This paper also...
This paper demonstrates the design and experimental implementation of an observer based model predictive control (OMPC) with a notch filter for the positioning of the piezoelectric tube (PZT) scanner of an atomic force microscope (AFM). This control scheme achieves active damping of the resonant mode of the PZT scanner and accurate tracking of a reference triangular signal. Kalman filter is used to...
This paper presents the design of an LQG controller for the lateral positioning of a piezoelectric tube actuator (PZT) used in an atomic force microscope (AFM). In the proposed control scheme, an internal model of the reference signal is included in the plant model and an integrator with the system error is introduced. As a result, it reduces the steady-state tracking error. A vibration compensator...
This paper presents a new approach to control the grid current and dc-link voltage for maximum power point tracking and improvement of the dynamic response of a three-phase grid-connected photovoltaic (PV) system. To control the grid current and dc-link voltage, the zero dynamic design approach of feedback linearization is used, which linearizes the system partially and enables controller design for...
The critical fault clearing time is an indicator of transient stability margin and it changes with the generator load condition. If the protection devices are capable of operating before the critical clearing time (CCT) and also providing faster auto-reclosing as soon as the fault is cleared, then the system will not loose its synchronism and remain in stable operation. The goal of this paper is to...
This paper presents the dynamics of photovoltaic (PV) cell with Plug in Hybrid Electric Vehicles (PHEVs) load. It is expected that PHEVs are going to be charged during the day with solar PV energy sources at the parking sites of PHEVs. The present work offers a complete system for charging PHEVs with PV cell where PHEVs load are modelled based on third order battery model. System dynamics are analyzed...
This paper presents a comparison of the performance of series and shunt compensation in stability improvement of wind farms. Static synchronous compensator (STATCOM) and static synchronous series compensator (SSSC) are used as shunt and series compensator respectively in order to enhance the system stability. The effect of control parameter tuning is also analysed. A comparison is also made between...
The use of doubly fed induction generators (DFIGs) in large wind energy conversion systems (WECS) has significantly increased during the last few years. The DFIG is interfaced to the AC network through a grid side voltage source converter (GSC) and a rotor side voltage source converter (RSC) to enable the variable speed operation of the wind turbine. Moreover, it provides reactive power support to...
This paper investigates small-signal stability of a distribution system with distributed generator and induction motor load, as a dynamic element. The analysis is carried out over a distribution test system with different types of induction motor loads. The system is linearised by the perturbation method. Eigenvalues and participation factors are calculated to see the modal interaction of the system...
This paper investigates the application of STATCOM to stabilize the torsional oscillations of sub-synchronous resonance (SSR) of a wind energy conversion system (WECS). The IEEE system-1 of the second benchmark model for computer simulation of subsynchronous resonance is adopted with integrating aggregated induction generator-based wind turbine to perform the study. A small signal analysis is conducted...
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