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This paper presents a method to assess the impact on system reliability of wind integration, considering coordinated operation with cascade hydropower. The seasonal characteristics of river flows and correlation amongst different wind farms are considered. Time sequential Monte Carlo simulation and Latin Hypercube Sampling techniques are used to preserve the characteristics of the time series of the...
In the last decade, harmonic analysis of Japanese middle voltage (MV) customer and low voltage (LV) customer has been done, the distribution of the fifth harmonic current can be classified MV customer's single phase load, LV customer's three phase and single phase load named group A and MV three phase load named group B, and the amplitude per load kW has been investigated from sum of each current...
This paper proposes a mean-variance optimization model for the grid-connected microgrid energy management system (MG-EMS). In the proposed method, both the expected system operating cost and the tie-line power fluctuation variance are taken as the objective functions to provide a trade-off between operating benefit and risk assessment for decision makers. Further, robust optimization (RO) has been...
• Paper presents the practical experience in evaluating adequacy of generating capacity by different regions in the Western interconnection. • It also outlines different probabilistic methodologies and tools used to calculate reliability indexes such as LOLE, EUE, etc in the Western Interconnection. • The paper made an attempt to emphases why industry today needs enhanced methodologies and tools and...
Line-Commutated Converter (LCC) based HVDC lines are widely used to transmit electric power and interconnect asynchronous AC systems. Due to the characteristic of LCC-based HVDC, large amount of reactive power consumed by HVDC potentially deteriorates system voltage stability. Reactive power control is crucial to alleviate adverse impacts of HVDC reactive power consumption from AC network and secure...
In this paper smart operation of micro energy hub is presented. Energy hub system consists of certain energy hubs and interconnectors that are coordinated by energy hub system operator. An energy hub contains several converters and storages to serve demanded services in most efficient manner from available energy carriers. In this paper, the flexibility of energy delivery point is enhanced using micro...
The convex relaxation approaches for power system state estimation (PSSE) offer robust alternatives to the conventional PSSE algorithms, by avoiding local optima and providing guaranteed convergence, critical especially when the states deviate significantly from the nominal conditions. On the other hand, the associated semidefinite programming problem may be computationally demanding. In this work,...
Power transformers are expensive and critical power system components. Reliable and secure protection schemes for transformers are extremely important. While transformer protection has evolved to a high degree of sophistication they cannot ensure 100% reliable and secure protection. A new transformer protection scheme based on dynamic state estimation is proposed. The dynamic transformer state is...
We developed a constrained state estimation method that clarifies the range of the feeder voltage in an unobservable distribution network in which the number of telemetric sensors is smaller than the number of state variables to be estimated. Instead of using pseudo-measurements, whose reliability is affected by unexpected power flow conditions, the method uses constant nominal boundaries as inequality...
The use of wind energy sources for supplying electric vehicle (EV) loads is a challenge for electricity market operators due to their inherent uncertainty in the current market architecture. Coordinated energy exchange between EV load aggregators and wind generating companies (WGenCOs) can potentially increase the competitiveness of WGenCOs and EV-load customers in the energy market. This paper proposes...
The objective of this paper is to present some discussions about data treatment in the new environment existing in the power systems and smart-grids. The paper presents some aspects of the data acquisition, communication, and security, and data amount, management, and mining. In this paper, some ideas are proposed to inspire discussions about the above themes. The goal of these discussions is to provide...
This paper introduces an exact and efficient method for computing and visualizing the power flow feasibility boundary of large networks composed of (1) saddle-node bifurcation manifolds where the Jacobian is singular and (2) limit-induced bifurcation manifolds where the network loses structural stability as the limit is encountered. This method is applied to the DTE/ITC system in Eastern Michigan...
Modeling and simulation of power systems for general-purpose transient studies has been receiving significant attention in the literature. Among recently proposed methods, the so-called shifted-frequency analysis (SFA) approach has been shown to facilitate accurate and numerically efficient simulation of electromagnetic and electromechanical transients with the use of dynamic phasors. This paper proposes...
With the development of smart grid technology, FACTS devices, such as SVC and STATCOM, are widely applied in practice. Since the FACTS devices possess fast dynamic response characteristics, they can provide effective support to power systems stability even during the transient process after severe contingencies. It is helpful to take into account the transient process stability constraints into reactive...
In view of China's national conditions, this paper put forward a novel strategy for the maximization of renewable energy consumption, with collaborative controlling between the transmission network and the distribution network. This strategy took the local distribution network as a flexible and adjustable electric source, which played an active role in the consumption activity of the large-scale renewable...
Reactive power planning or VAR planning is critical to ensure acceptable power quality and system robustness. While addressing var planning, the key issue is optimal allocation i.e. location and size of reactive power sources. Security of power systems is a major concern during contingencies. So, consideration of all plausible contingencies during planning process is important. However, consideration...
A major ongoing effort by utilities is to improve their emergency preparedness process for weather events, in order to: 1) reduce outage time 2) reduce repair and restoration costs and 3) improve customer satisfaction. This paper proposes a method for forecasting the number of damages of different types that will result from a weather event, up to 3 days before the event actually occurs. The proposed...
This paper presents a model to optimally select and operate energy storage devices attached to renewable energy generators connected to power distribution systems. The purpose is to supply a load during specific periods, considering the intermittence of the renewable energy resources and variable electricity rates. Thus, it was developed a database containing information obtained from catalogs of...
There is a growing interest to increase temporal resolution in power system optimization models in order to improve representation of intermittent renewable generation and thus capture more variability and costs. This increase in temporal resolution, however, presents important modeling challenges since the optimization problem complexity grows with the higher number of variables and constraints needed...
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