scholarly journals Gauss-Seidel Method based Voltage Security Analysis of Distribution System

2018 ◽  
Vol 8 (1) ◽  
pp. 43
Author(s):  
Gagari Deb ◽  
Kabir Chakraborty
Keyword(s):  
Power System ◽  
Distribution System ◽  
Critical Line ◽  
Security Analysis ◽  
System Stability ◽  
Measurement Unit ◽  
Power Network ◽  
Radial Distribution System ◽  
Voltage Security ◽  
Base Data

Complexity of modern power network and Large disturbance results voltage collapse. So, voltage security analysis is important in power system. Indicators are helpful in voltage stability analysis, as they give information about the state of the system. In this paper a new indicator namely Distribution System Stability Indicator (DSSI) has been formulated using the information of Phasor Measurement Unit (PMU).The proposed indicator (DSSI) is tested on standard IEEE 33 bus radial distribution system. The suggested indicator is also applicable to the equivalent two bus system of a multi-bus power system. The proposed indicator is calculated for different contingent conditions at different system load configurations. The result of DSSI is verified with the standard indicator (VSI) which proves applicability of the proposed indicator. The bus voltages of all the buses at base loading and at maximum loading are evaluated for base data and for tripping of most critical line.

Wide Area Input Stabilizer for Damping of Power System Inter-Area Oscillation

2013 ◽  
Vol 479-480 ◽  
pp. 530-534
Author(s):  
Van Dien Doan ◽  
Ta Hsiu Tseng ◽  
Pei Hwa Huang
Keyword(s):  
Power System ◽  
System Stability ◽  
Measurement Unit ◽  
Small Signal Stability ◽  
Signal Stability ◽  
Power Oscillations ◽  
Study Results ◽  
System Stabilizer ◽  
Small Signal Stability Analysis ◽  
Remote Feedback

The main objective of this paper is to report the small signal stability analysis of Vietnam Power System which has a longitudinal network structure with the consideration of power system stabilizer (PSS) in operation to enhance the damping of inter-area oscillation by using local as well as remote feedback signals via phasor measurement unit (PMU). Both methods of frequency domain and time domain analyses are used to investigate the performance of the power system. The study results show that by proper selection of PSS installation locations and remote feedback signals, power oscillations on the tie-line will be reduced and the system stability is thus improved.

scholarly journals Implementation of a Dynamic Network Model of the Nigerian Transmission Grid for Investigations on Power System Stability

2019 ◽  
Author(s):  
Kosisochukwu Pal Nnoli
Keyword(s):  
Power System ◽  
Dynamic Models ◽  
Model Performance ◽  
Dynamic Network ◽  
Modern Society ◽  
Electrical Energy ◽  
Load Flow ◽  
System Stability ◽  
Power Network ◽  
Transmission Grid

Electricity is the backbone of any modern society and economy. Therefore, economic growth and an increase in social wealth of a country usually lead to an increase in demand for electrical energy especially for a country as Nigeria. As the population of Nigeria is increasing exponentially, there exists a need to make basic needs constantly available, for the wellbeing of the increasing population. This is possible through mechanization. Reliable and stable electricity supply is the surest means to this end. As a result, there is a need to constantly review the dynamics of the power system while more energy sources and loads are being added to the existing power network grid. This creates a demand for precise models for the corresponding network. In this paper, the power network system of the Nigerian transmission grid was implemented at normal operations to include the dynamic models to the corresponding network elements (i.e. generation Units based on their installed capacities and controllers). With the help of this model, stationary load flow calculations, as well as the network’s model performance in steady state was conducted. The network’s model performance in the case of load changes and fault operations was also carried out. These allowed for investigations on the stability status of the Nigerian transmission grid.

scholarly journals Voltage Profile Assessment in Distribution Substation using Generalized Regression Neural Network

2019 ◽  
Vol 8 (2) ◽  
pp. 3600-3604
Keyword(s):  
Neural Network ◽  
Power System ◽  
Iterative Methods ◽  
Distribution System ◽  
Power Flow ◽  
System Stability ◽  
Convergence Time ◽  
Generalized Regression Neural Network ◽  
Voltage Profile ◽  
Generalized Regression

Power system stability is one of the major factors for the reliable operation of electric utilities. Factors resulting power system instability are the sudden increase in load or insufficient reactive power support. Efficient Voltage regulation methods enable the system to operate in a stable operating condition. Many methods reported in the literature for voltage stability assessment of the power system such as optimization method, continuation power flow method, Indices based method and Artificial Intelligence based methods. Several iterative methods are used for the solution of load flow problems. The major disadvantages of iterative methods are larger iteration and increase in convergence time which depends on size of the power system. This paper proposes new method for voltage profile assessment on distribution system using Generalized Regression Neural Network. The Power System Analysis Toolbox (PSAT) is used for Distribution power flow solution. The proposed method is tested using 52 buses, distribution system of Tirunelveli, Tamil Nadu India. The technical feasibility of the proposed method is verified by comparing the results of proposed method and PSAT

scholarly journals Smart Protection Scheme For Radial Distribution System

2019 ◽  
Vol 8 (6) ◽  
pp. 3621-3624
Keyword(s):  
Power System ◽  
Differential Evolution ◽  
Distribution System ◽  
Coordination Problem ◽  
Radial Distribution System ◽  
Protection Scheme ◽  
Relay Coordination ◽  
Overcurrent Relays ◽  
Optimal Coordination ◽  
Real Time Simulations

In this paper,the study of optimal coordination of directional overcurrent relays along with relay communication in HV substations is proposed. The relay coordination problem is non linear.It typically consist of two groups of control variables(Time Dial Settings:TDS and Plug Settings:PS). The purpose of relay coordination is to propose the suitable settings for all releases and ensure the coordination. The differential evolution is employed to solve for solutions of optimal relay coordination. The relay coordination is mainly done to improve selectivity of the relay to particular fault. ETAP is so popular for its capability for modelling of power system networks and analyzing various studies and Real Time simulations.

An Intelligent Sensor Framework for the Power Grid

2011 ◽  
Author(s):  
Bora Akyol ◽  
Jereme Haack ◽  
Cody Tews ◽  
Brandon Carpenter ◽  
Anand Kulkarni ◽  
...  
Keyword(s):  
Power System ◽  
Electric Power ◽  
Distributed Generation ◽  
Distribution System ◽  
Power Grid ◽  
Electric Power System ◽  
System Stability ◽  
Distributed Resources ◽  
Automation Systems ◽  
Micro Grids

The number of sensors connected to the electric power system is expected to grow by several orders of magnitude by 2020. However, the information networks which will transmit and analyze the resulting data are ill-equipped to handle the resulting volume with reliable real-time delivery. Without the ability to manage and use this data, deploying sensors such as phasor measurement units in the transmission system and smart meters in the distribution system will not result in the desired improvements in the power grid. The ability to exploit the massive data being generated by new sensors would allow for more efficient flow of power and increased survivability of the grid. Additionally, the power systems of today are not capable of managing two-way power flow to accommodate distributed generation capabilities due to concerns about system stability and lack of system flexibility. The research that we are performing creates a framework to add “intelligence” to the sensors and actuators being used today in the electric power system. Sensors that use our framework will be capable of sharing information through the various layers of the electric power system to enable two-way information flow to help facilitate integration of distributed resources. Several techniques are considered including use of peer-to-peer communication as well as distributed agents. Specifically, we will have software agents operating on systems with differing levels of computing power. The agents will cooperate to bring computation closer to the data. The types of computation considered are control decisions, data analysis, and demand/response. When paired with distributed autonomous controllers, the sensors form the basis of an information system that supports deployment of both micro-grids and islanding. Our efforts in the area of developing the next generation information infrastructure for sensors in the power grid form the basis of a broader strategy that enables better integration of distributed generation, distribution automation systems and decentralized control (micro-grids).

scholarly journals Multi-Objective Service Restoration of Radial Distribution System in the Presence of Non-Linear Loads

Electronics ◽  
2019 ◽  
Vol 8 (3) ◽  
pp. 369
Author(s):  
Ishan Srivastava ◽  
Sunil Bhat ◽  
Agarala Ajaysekhar Reddy
Keyword(s):  
Radial Distribution ◽  
Distribution System ◽  
Normal Operation ◽  
Power Network ◽  
Nsga Ii ◽  
Radial Distribution System ◽  
Current Harmonics ◽  
Multi Objective ◽  
Service Restoration ◽  
Non Linear

Most of the power electronic components act as non-linear loads because they draw non- sinusoidal current from the power supply. Due to these non-linear loads, current harmonics are injected in the power network. For normal operation, any power network is equipped with provisions to keep the harmonics level to a minimum value. Whenever a fault occurs in the distribution system, the primary goal is to re-energize the healthy part of the network which got interrupted. It can be done by changing the topology of the network. This method is called as Service Restoration (SR). In this paper, a service restoration strategy is proposed when non-linear loads are present in the radial distribution system. Service restoration problem is formulated as a multi-objective, constrained optimization problem. Three new objectives are included to address the problem of harmonics injection by non-linear loads. Multi-Objective Particle Swarm Optimization (MOPSO) and Non-Dominated Sorting Genetic Algorithm-II (NSGA-II) are used to find the optimal switching sequence for restoration. To test the effectiveness of the proposed methodology, IEEE 33 bus and IEEE 69 bus test systems are taken.

scholarly journals Modeling, Control and Power Management of Six-Phase PMSM Based Shipboard MVDC Distribution System

Energies ◽  
2020 ◽  
Vol 13 (16) ◽  
pp. 4229
Author(s):  
Anil Lamichhane ◽  
Lidan Zhou ◽  
Gang Yao ◽  
Muhammad Luqman
Keyword(s):  
Diesel Engine ◽  
Power System ◽  
Power Management ◽  
System Reliability ◽  
Distribution System ◽  
Fuel Oil ◽  
System Stability ◽  
Pv System ◽  
Shipboard Power System ◽  
Shipboard Power

In the modern shipboard power system, there is a growing concern about reduced fuel economy, efficiency improvement, and minimized emission in recent years. Besides, considering the islanded nature of the shipboard power system, ensuring the system reliability at both generation and load side is crucial. In this context, a hybrid medium voltage DC (MVDC) distribution system concept with diesel engine, PV system, and battery energy storage system (BESS) as the generators for the shipboard power system is proposed. Variable speed operation of a diesel engine is considered for the benefit of minimal specific fuel oil consumption (SFOC). Regarding the fault-tolerant characteristics of six-phase permanent magnet synchronous machine (PMSM), it is used for both generating and motoring application, thus maintaining system reliability at any time. A hierarchical control system is designed and implemented to ensure proper load power-sharing among the generators and to regulate the dc-link voltage of the proposed MVDC distribution system. To bolster the intent of minimal SFOC zone operation of diesel engines and coordination between the generators and load, a deterministic rule-based power management system is proposed and implemented. The simulation is carried out for potential operational modes of a cruise ship in the MATLAB/Simulink environment. Simulation results show that the proposed topological and control structure has satisfactory performance in terms of power delivery, stable dc-link dynamics, and overall system stability.

Generator Dynamic Response Analysis and Improvement Following Distribution Network Disturbance

2017 ◽  
Vol 7 (2) ◽  
pp. 356
Author(s):  
Mirza Saric
Keyword(s):  
Dynamic Response ◽  
Power System ◽  
Transient Stability ◽  
Planning Process ◽  
Renewable Energy Sources ◽  
Methodological Approach ◽  
System Stability ◽  
Response Analysis ◽  
Power Network ◽  
Ongoing Research

<p>Use of renewable energy sources for the purposes of electricity generation is increasing throughout the world. Connection of new generators, however, introduces significant challenges to power network operators and managers. The power system transient stability is affected by the grid connection of new generation units. The objective of this paper is to investigate asynchronous generator dynamic response issues and capabilities under three phase symmetrical fault conditions and to propose a methodological approach to designing a generator transient stability solutions. Analysis and methodology are introduced through a realistic generator connection example. Simulations show that power system stability can be significantly affected by the connection of new generators and that this phenomena needs to be carefully considered during the connection planning process. This paper is a part of an ongoing research on the distributed generation impact on power network and its aim is to provide two main contributions to the existing body of knowledge. Firstly, it is expected that this paper will contribute toward a better understanding of the influence that generators have on the power system transient stability. Secondly, this paper is expected to contribute towards the practical understanding of fundamental power system transient stability improvement solutions.</p>

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