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With the expansion and enhancement of the power transmission network, short-circuit current (SCC) has become a major concern in grid operations. While transmission switching is one effective solution to reduce the SCC without investing in additional equipment, switching lines could threaten system N-1 security. To find an efficient, and secure, yet economic switching solution, this paper proposes...
The fast growing expansion of renewable energy increases the complexities in balancing generation and demand in the power system. The energy-shifting and fast-ramping capability of energy storage has led to increasing interests in batteries to facilitate the integration of renewable resources. In this paper, we present a two-step framework to evaluate the potential value of energy storage in power...
This article presents an important finding: the parameters of secondary frequency control based on integral or proportional integral control can be tuned to achieve economic operation and frequency regulation simultaneously. We show that if the power imbalance is represented by frequency deviation, an iterative dual ascent based economic dispatch solving is equivalent to integral control. An iterative...
Planned and unplanned outages on distribution networks may cause major economic loss to the customers, and can result in substantial reparation payments by the utilities. This paper analyzes the use of a Battery Energy Storage System (BESS) to partially or completely avoid these outages. The analysis is conducted with a multi-day high demand scenario where the load demand at peak times exceeds the...
Increasing penetration of renewable power sources (RESs) is bringing more uncertainties to power systems. Real-time economic dispatch should be able to handle the fluctuations caused by the load as well as RESs, and obtain new optimal operating points after deviating from original generation schedules. This paper proposes a generation adjustment algorithm based on the base point and participation...
We introduce emerging utility-scale energy storage (e.g., batteries) as part of the set of control measures in a corrective form of the security-constrained unit commitment (SCUC) problem. This enhanced SCUC (ESCUC) leverages utility-scale energy storage for multiple applications. In the base case, the storage units are optimally charged and discharged to realize economic operation. Immediately following...
This letter presents an unambiguous distance-based mixed-integer quadratic programming (UDB-MIQP) model to solve economic dispatch problems with disjoint operating zones. By considering the distances among the prohibited zones, the unnecessary variables will be eliminated and, consequently, a significant decrease, both in terms of variables and constraints, is obtained. The results show that the UDB...
HVDC provides the capability of designing transmission overlays that can add new functional capabilities to the HVDC and AC combined transmission system. The HVDC overlay can be designed as a network to provide power transfer limits higher than the present AC system. All or a good share of the contingent flows can designed to have congestion and loading managed with rescheduling of the HVDC network...
Multi-Agent System (MAS) architecture is a widely investigated topic for application in distributed control for power system operations. The key quality of MAS is its communication which must be versatile for any MAS based control. In this paper, a new communication algorithm for MAS based on Peer to Peer (P2P) communication agreeing to FIPA (Foundation of Intelligent Physical Agents) specifications...
There are various undergoing efforts by system operators to set up an electricity market at the distribution level to enable a rapid and widespread deployment of distributed energy resources (DERs) and microgrids. This paper follows the previous work of the authors in implementing the distribution market operator (DMO) concept, and focuses on investigating the clearing and settlement processes performed...
In this paper we examine potential improvements in how load and generation forecast uncertainty is captured when setting reserve levels in power systems with significant renewable generation penetration and discuss the merit of proposed new methods in this area. One important difference between methods is whether reserves are defined based on the marginal distribution of forecast errors, as calculated...
In this paper, a simulation tool based on the probabilistic three phase Load Flow (PLF) program has been developed by using Monte Carlo techniques. By using this tool, technical and economic impacts of EV integration on the distribution network are assessed. Studies of the potential opportunities of ancillary services provided by EV are also carried out by using this tool. In order to reduce congestion...
The disjoint feasible zones make the economic dispatch problem non-convex. The existed solving schemes either rely on random searching, or use additional auxiliary variables, or involve high nonlinearity. In this paper, a new method is presented to overcome the main drawbacks in existed schemes. Due to its simple structure, the proposed approach also has the advantage to expedite the implementation.
With large amount of renewable energy resources integrated into strong coupling interconnected power system (IPS), the conventional automatic generation control (AGC) scheme leads to the increase of the AGC regulation cost and the shortage of the AGC regulation amount in some control areas. In this paper, cooperation of AGC in different control areas was used to solve these problems. Optimal cooperation...
This paper proposes a real-time dynamic load dispatch with wind power participation method, which is able to minimize the generate cost of power systems with large-scale wind power integration. Firstly, wind power is modeled using versatile probability distribution. Then, real-time dynamic economic dispatch with wind power participation model is established. Using the corrective equal incremental...
This paper investigates the fundamental issue of revenue adequacy in wholesale day-ahead electricity markets with the presence of standalone demand response providers (DRPs). In recent years, with the increasing need for flexibility to provide sustainable electricity services, standalone DRPs have emerged as a new form of market participants. Such providers serve as intermediate between ISOs and end-users,...
Robust Security-Constrained Unit Commitment (RSCUC) becomes one of the successful approaches to handling high penetration level of renewables (RES) in the electricity market. However, RSCUC can only be applied in Reliability Assessment Commitment (RAC) without corresponding energy and reserve price signals in the Day-ahead Market (DAM). In this paper, the locational marginal prices for energy and...
As aging coal-fired capacity retires following EPA rules, some RTO/ISOs are facing tightening supply margins, and seldom-used emergency only resources such as Load Modifying Resource may have to be deployed. The injection of emergency capacity, however, can result in price depression, and the uneconomic price signals may further lead to participant actions that endanger reliable grid operations. It...
With the popularization of Electric Vehicles (EVs), the out-of-order random charging behavior of large-scale EVs will bring new challenges to the safe and economic dispatch of power system. This paper divides the driving area into four zones according to the functional area of distribution network, and a regional time-of-use (RTOU) electricity price model is proposed considering its spatial and temporal...
This study evaluates the outage probability and electricity customer cost under the potential weather caused power blackouts. Risk assessment of the weather impact on customers is implemented and visualized in ArcGIS map. The methodology correlates the historical large power outage events with the corresponding weather condition of the time, uses weather forecast data to assess the risk for customers,...
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