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In this paper, global frequency stability and inertia analysis is performed on a power system consisting of two asynchronous grids connected through a High Voltage Direct Current (HVDC) transmission. Frequency and inertia support providing controllers in the HVDC converters are analyzed with both linear/modal analysis and non-linear dynamic simulations. The analyses focus on dynamics that are in the...
An approach for the design of a Special Protection Scheme (SPS) is presented, based on Artificial Intelligence and probabilistic techniques. In detail, the aim of the SPS is to maintain the synchronism of a power plant after grid outages. To improve the SPS design, the impact of communication delays is accounted for in a probabilistic way. The SPS control logic, deciding how much power to curtail...
Overcoming the impacts of multiple contingencies on electric power systems with renewable resources is a significant research topic for electric utilities. Evaluating system responses under transient conditions reveals which factors impact the stability of power systems, especially with existing solar photovoltaic energy sources in those systems. This work focuses on analyzing the effects of solar...
Minimization of voltage deviations and power loss can be controlled by optimal reactive power dispatch for voltage stability of the system. This paper presents Genetic Algorithm approach for system parameters enhancement and optimal reactive power dispatch. The transformers tap changers, generator exciters, switchable VAR sources are used as control variables for improvement of system parameters....
When alternative power sources are connected to the utility grid the core characteristics of the system are changed. This fact is especially true for intermittent, volatile power sources such as photovoltaic (PV) systems. In recent years, PV power systems have become increasingly cost competitive leading to greater penetrations of both large and small scale PV systems. The large scale integration...
Security assessment is an important means to prevent large-scale blackouts. This paper proposes an overall evaluation indicator from a macro perspective of the grid security. The indicator is proposed from the view of the main task of the grid operation. It takes the reserve level as the carrier and sets various security and stability constraints on power outputs to get the total maximum output of...
In this paper, two charging modes of battery energy storage system (BESS) for a stand-alone microgrid are analyzed. The stand-alone microgrid system consists of 50kW BESS, 50kW diesel generator (DG) and controllable loads, where BESS is composed of 115kWh battery bank and 50kW DC-AC inverter. The operation modes of the stand-alone microgrid system are divided into four modes, and BESS is connected...
This paper presents a critical scenario of voltage stability study on a multi-machine system when subjected to different loading patterns. High Voltage Direct Current (HVDC) links control and the effects of its compensating devices' effects on voltage stability are also investigated. A static approach with the use of P-V (Power-Voltage) and Q-V (Reactive power-Voltage) curve was used in this study...
Power system stabilizer (PSS) is the most well-known and efficient device used to damp power system small signal oscillations caused by small disturbances. In this paper, an effective and practical tuning method of PSSs and their application to the GARRI power station are presented. The selection of parameters, such as lead-lag time constants for phase compensation and system gain, are optimized using...
The Effect of increasing penetration of full converter controlled-based generators (CCBGs) in a large scale power system is evaluated by using MATLAB program based on small signal stability analysis. The power system has been subjected for two types of tests, the first test has been implemented by disturbing the system through applying 3-phase fault at the infinite bus system, and the second one by...
In India, most of the microgrids consist of wind energy sources which are located in rural areas to mitigate the energy deficiency and where the grid is weak in nature. The grid architecture of urban India is ring type where in rural side it is mostly radial is nature. In radial topology, power source is located in one point of the distribution line and the loads are connected to the other ends. The...
Power systems and study through modal analysis has yielded important results and critical information in the area of stability both for steady state and transient state condition. This paper explores application of such an modal analysis in bringing out information on system model, eigenvalues, participation factors of generating machines and controls, small signal changes in various inputs and its...
With the growing demand of electricity, deployment of microgrid is becoming an attractive option to meet the energy demands. However, a grid connected microgrid suffers a crucial stability issues during a fault in utility grid. For stable operation of microgrid during fault in grid, islanding operation is generally adapted. In this paper transient stability of the microgrid is analyzed during fault...
Modern SoC designs employ a number of power domains, many of which are often implemented by low-drop-out (LDO) regulators. The key overhead of the existing LDO design is the large off-chip output capacitor (Cout) for compensating a large/fast change in load current (ILOAD). Miniaturizing and thus integrating COUT on a chip is highly desirable and theoretically possible by shortening the control loop...
In this paper an examination has been performed for the upgradation of transient stability limit in two area multimachine power system using different FACTS devices. The simulation of two area multimachine power system including FACTS devices has been carried out in the MATLAB Simulink domain. The performance of unified power flow controller (UPFC) for the upgradation of transient stability limit...
This paper primarily focuses on Small Signal Stability Analysis of power system integrated with Wind Generation. Power System Stabilizer (PSS) is used with Wind Generation to investigate its effectiveness in damping out Local Area (Plant Mode) Oscillations. The effects are analyzed on 9-Bus Test System using established modeling and simulation techniques. Using SMIB based generator model, AVR lag...
This research paper employs static and dynamic studies under different case studies in order to define the potential impact of the integration of two PV power plants in a distribution network. The selected power system represents the electric infrastructure of Al Akhawayn University in Ifrane, Morocco. This work focuses on the impact may induce any distributed units' addition on the power system's...
Today, wind generators have to compete with many other energy sources. Therefore, it is important that they should be cost effective. They need to meet any load requirements and produce energy at a minimum cost per dollar of investment. This paper investigates about the studies of voltage collapse in grid while integrating the wind turbine equipped with squirrel cage induction generator. The aim of...
Due to the economic and environmental reasons, Saudi Arabia plans to deploy large scale grid-connected distributed generators (DGs) such as photovoltaic (PV) and wind energy systems. Detailed analyses must be carried out to study the impact of such systems on the dynamics and operational characteristics of the existing network. Main focus of this work is to investigate the improvement in voltage stability...
The current energy trend is the hybrid system projection in which renewable sources and storage systems provide a high percentage of energy needs, leaving the use of conventional system for emergency cases. Hence, microgrids represent a viable solution for the electricity demands in isolated or non-electrified areas. Only diesel generators were previously used in this kind of applications. Their efficiency...
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