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This paper presents the simulated and measured results of switching transients of the laboratory Microgrid system of the companion paper in Part I that implements a web-based monitoring system using an industrial PLC and campus internet. The studied laboratory Microgrid system consists of two wind induction generators, an AC-to-DC converter, a DC-to-AC inverter, a PV module, a UPS, and a battery module,...
The evolving synchrophasor standards under transient condition may stipulate the phasor measurements to carry information regarding the quality of measurements in addition to the time stamp. This paper proposes an index, named as the Synchrophasor Transient Monitor (STM), for indicating the quality of the phasors. A Teager energy concept has been utilized to estimate the time of occurrence of the...
The targeted and current development of wind energy in various countries around the world reveals that wind power is the fastest growing power generation technology. Among the several wind generation technologies, variable speed wind turbines utilizing doubly fed induction generators (DFIGs) are gaining momentum in the power industry. With the increase in penetration of these wind turbines, the power...
This paper presents a general model of dual infeed HVDC system applying VSC-HVDC, which can be used as an element in large multi infeed HVDC system. The model may have different structure under different grid faults because of the action of breakers. Hence power flow of the system based on this model is analyzed under steady state and different kinds of grid fault transient situations. Two main control...
For any type of shunt faults in power system, all parts of the network will experience voltage sag (voltage dip) for the duration at least equal to the fault clearing time. The percent of this voltage sag at a given point depends to its distance to the fault and fault resistance. If a bus bar supplying a group of induction motors is exposed to such voltage dip, which may be due to a fault at another...
Over the past several years, several bushings equipped with draw leads have failed in service. These bushings are not isolated to a single manufacturer and all of them have passed standard routine and type tests. A common characteristic of each failure is the arcing marks found between the draw lead cable and the tube in the center of the bushing. Most of the bushings also failed violently, in that...
With the advance of power electronic technology, HVDC light transmission based on voltage-source IGBT power converters have been increased rapidly in renewable and electric power system applications. This paper focuses on the analysis of traditional decoupled d-q vector control approaches for control of power transmission in a HVDC light system. The paper presents steady-state and transient models...
In this paper, a method of decision tree-based computation of security regions and boundaries for power systems is proposed. These computations are used in dynamic security enhancement via generation rescheduling against transient instabilities. This work also involves an iterative method of generation rescheduling using the security regions calculated by decision trees. The proposed methods are implemented...
Mathematical Morphology (MM) has been discussed in recent literature for its possible applications in power systems. However, the application of MM as a real-time filtering tool in power systems has not been explored adequately. This paper reports further contributions to our previous efforts in this direction. The paper shows how an appropriate choice of the structuring element (SE) can help develop...
Determining suitable locations of series-connected controllers is a practical problem when it is necessary to install them in modern power systems. The aim of this paper is to find the best location of series controllers in order to reduce the proximity to instability of a current operating point of a power system, from a transient stability viewpoint. In order to achieve this goal, a general approach...
Photovoltaic (PV) solar generation is one of the most promising renewable generation technologies that can potentially help electric utility companies meet the Renewable Portfolio Standards (RPS) target. This paper presents potential transient over-voltage issues associated with PV solar generators, as identified in interconnection studies. The paper provides analysis of bus voltage response due to...
An important aspect of wind power plant (WPP) impact studies is to evaluate the short circuit (SC) current contribution of the plant into the transmission network under different fault conditions. This task can be challenging to protection engineers due to the topology differences between different types of wind turbine generators (WTGs) and the conventional generating units. This paper presents simulation...
In this paper a conceptual solution is presented for power system dynamic security inference and visualization. It enables collecting information on power system security aspects and delivers an over-all system performance by means of a single indicator. Visualizing the indicator in a clear and meaningful manner can help identifying system states and focuses one's attention to the dangerous ones.
LV networks have usually their own difficulties regarding fault detection and location methodologies. Detection of downed conductors still represents the most challenging problem for such networks. These faults are usually characterized with very low fault currents. This inhibits detecting them with conventional current-based relaying functions. As a result, they are potentially life-threatening and...
A system integration study was undertaken to evaluate the feasibility of a three-terminal HVdc system linking Labrador, Newfoundland and New Brunswick, a component of the Lower Churchill Project. The main focus was the impact of the HVdc system on the Newfoundland Island Interconnected system, a system that is currently electrically isolated from the North American grid. The 800 MW HVdc terminal on...
Offshore wind energy has a high potential especially in Northern-Europe. Future wind power plants may be situated further from the shore and therefore a high-voltage direct current connection based on voltage sourced converters is most suitable for grid integration. Connection utilization can be improved by interconnecting several wind power plants leading to multiterminal schemes. This paper describes...
This paper analyzes the impact on transient and frequency stability for a power system at very high wind penetration (40% wind). Wind penetration is based on the doubly-fed induction generator (DFIG), and a systematic approach has been adopted for wind power integration. A sensitivity analysis has been carried out for each wind integration scenario and for different wind generator loading conditions...
This paper presents an energy-based hybrid control, which replaces the traditional automatic voltage regulator (AVR) for excitation control of a synchronous generator connected to an infinite power system. The proposed controller is based on energy representation of the power system by using a port-controlled Hamiltonian form. The controller uses a hierarchical hybrid architecture characterized by...
Summary form only given. A so-called voltage-behind-reactance (VBR) induction machine model has recently been proposed for the Electro-Magnetic Transient Program (EMTP) solution as an advantageous alternative to the traditional qd and phase-domain (PD) models. This paper focuses on achieving an efficient interface of the machine models with the EMTP network. It is shown first that a discretized PD...
The Smart Grid concept is conceived as a means to optimize and to improve the reliability of the electric delivery system. The numerous and different types of information generated at the remote sites at a distribution network by sensors and smart meters coupled with a communication infrastructure and data base management system provide the means to generate useful control algorithms. However, control...
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