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In this paper, PSO based robust load flow is proposed. In the proposed decoupled based PSO technique, the decoupling features among the power flow variables are taken into consideration. Very simple technique is applied to prompt the convergence. Keeping all inherent properties of evolutionary technique, improvement method is developed to attain better performances. To detect the stability margin,...
Wind turbine system (WTS) now a day has turned out to be exceptionally useful technique to minimize the centralization of electrical power particularly in provincial territories and rural areas. In any grid connected WTS there are alternatives for receiving reactive power from main grid but if it is islanded or made off grid in that case we need to look for different choices for voltage profile improvement...
An increase in the decentralization of power generation, it has become necessary to study the effects of distributed generation and propose a suitable modification to the protection system to increase the reliability. The paper focuses on the effect of distributed generation on the quality of power at any location concerned due to faults occurring on the power system. The waveforms of the currents...
This paper presents a methodology for the identification of critical locations of power systems using eigenvalue analysis of measurements of the system variables. The eigenvalue analysis is implemented using Principal Component Analysis (PCA) and the methodology is tested on the IEEE 118- bus system. The identification of critical locations in a power system would enable the utility company smartly...
The work presented in this paper describes an improvement of a P-V optimal slope MPPT technique. To achieve this improvement, all the degrees of freedom of the inverter control are exploited. Two forms are then established. Modeling and design of a PV power plant using these improved forms are performed. The results are validated by simulation in the Matlab-Simulink environment.
Distributed generation (DG), is being increasingly adapted in distribution network. The advantages of placing DG in the distribution network are loss reduction, backup power supply, and real, reactive power management increase reliability of the network. In this paper Cuckoo Search Algorithm (CSA) has been adapted for optimal sizing and placement of DG for loss minimization Comparisons are made between...
A new evolutionary optimization technique, crow search algorithm (CSA) is proposed in this paper for solving the optimal power flow (OPF) problem. The algorithm has been implemented on IEEE 30 bus test system to check its effectiveness in solving the OPF problem after satisfying various operational constraints. A comparative study of the results is presented in this paper. Analysis of the results...
\n order to find a new online method to identify the rotor inter-turn short circuit fault of brushless excitation synchronous generator, this paper analyzed the changes of electromagnetic properties and electrical parameters and got the fault characteristics that field current increased and reactive power decreased after fault. The relative deviation of generator output reactive power before and after...
This paper deals with control method of the boost-type matrix converter for three-phase four wire system (boost-type MC) that can expands range of available load. We intend that the converter is utilized for a stand-alone power source. Two kinds of control methods for the boost-type MC was proposed [1]. However, there is a problem that the system has limited range of available load. In this paper,...
This paper deals with the modeling and the control of a dual stator induction generator (DSIG) integrated into a wind energy conversion system with a variable speed wind turbine. DSIG is increasingly used because of its advantages in better reliability and supply division. The objective of this work is to present the application of sliding mode control on a DSIG driven by a wind turbine in the second...
In this paper is presented the current situation of the photovoltaic power plants in Romania. Also, is analyzed the impact of two photovoltaic (PV) power plants, which are installed in the Mureş County, on a Medium Voltage Line. The PV power plants are connected to the Sovata-Fântânele 20 kV Overhead Medium Voltage line. The case study contains an analysis of the active and reactive power losses across...
Voltage stability assessment methodology based on construction of equivalent reactive power reserve utilizing limited access to observables is described in the paper. The purpose of the method is to be able to evaluate voltage stability margin in an on-line manner without the need to perform voltage stability analysis every time a contingency occurs in the power system. It is shown that by using reactive...
Power system electromechanical oscillation dynamics can be described using second-order consensus dynamics. The synchronizing torques that hold the machines together are determined by the Laplacian matrix of the consensus dynamics. This paper develops a framework to investigate the effect of connecting nontraditional generation (NTG), in the form of active and reactive current injection, on the consensus...
The expanding installation of photovoltaic (PV) resources into power systems continue to grow which affects both structural and dynamics of power systems. The effects of large-scale grid-connected PV on the stability of power systems becomes a serious concern, because of the different dynamic behaviour of the power system with a considered portion of inertialess of the P-V based systems. This paper...
In this paper, the variable speed wind turbine connected to the ac grid through power converter system consist of two voltage source converters namely, generator side converter and grid side converter and a common dc link. Active and reactive powers of converters were controlled independently by using vector control method to improve low voltage ride through (LVRT) capability of wind energy system...
This study proposes an effective analyticalheuristic approach for solving optimal placement and sizing of multiple distributed generator problem to achieve a high loss reduction in large-scale distribution network. Proposed analytical- heuristic method (AHM) is based on improvement of LSF (loss sensitivity factor) method. AHM utilizes PSO (particle swarm optimization) algorithm to find the optimal...
This paper proposes scheduling of induction generators on a DC microgrid system fed by multiple cage-rotor induction generators (CRIGs) to attain regulated voltage with minimal battery support. The capacity of each generator is selected such that next bigger generation unit is double that of previous i.e. the ratio 1∶2∶4∶8‥, which provides easy control of load-generation matching, duly supported by...
In this paper, a new approach based on an ac power flow method has been developed for congestion management with the help of Flexible AC Transmission System (FACTS) devices in the power system. In this work, Unified Power Flow Controller (UPFC) has been used for study as it is most versatile device in FACTS family. It has been assumed that UPFC was optimally placed based on some existing method. The...
This paper presents the design of a micro-grid with permanent magnet brushless DC (PMBLDC) generator based wind energy conversion system (WECS) and Solar PV along with stand-alone loads. The output of the PMBLDC is converted to a controlled DC bus voltage using a PWM rectifier through which independent real and reactive power control are achieved. This DC bus is common to both solar PV and WECS. A...
Wind power generation and Solar PV installations continues to grow and are the two key contributors to the large scale variable power generation mix. Utility transmission system operators impose stringent grid codes internationally. Grid code regulations are defined by system operators to outline the rights and responsibilities of all the generators and loads that are connected to the transmission/distribution...
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