The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper combines two previous techniques, reference independent LMP decomposition and fictitious nodal demand (FND), to achieve an improved LMP model. The combined model distributes system losses in each individual line such that there is no mismatch in every bus. Also, the reference independent LMP decomposition is still preserved..
This paper proposes a framework for assessing wind energy conversion systems (WECS) reliability in the face of external disturbances, e.g. grid fault, and internal component faults. The proposed reliability assessment allows a quantitative analysis of WECS designs; analysis of WECS control schemes, e.g. fault ride-through mechanisms; identification of key design parameters that influence overall WECS...
This paper presents an application of Dynamic Matrix Control (DMC) for controlling steam temperatures in a large-scale once-through boiler-turbine system. In order to control the steam temperatures, we choose a spray and a damper as two controllers. The step response model for the DMC is generated for the two major output variables, superheater and reheater temperatures, by performing step-input tests...
Protection security assessment of power grids becomes an important task in the course of a competitive energy business and a decarbonized power generation. The analysis of past blackouts studied by the North American Electric Reliability Council (NERC) shows that protection relays are involved in about 75% of all major disturbances. One reason for that is the non adequate adaption of the protection...
The increase in the number of requests from Independent Power Producers - IPPs to access the distribution network close to load centers, as Distributed Generation, requires the development of new methodologies to quantify the impact of these units in the system. The connection of these generators, which may be associated with renewable energy sources of intermittent nature, such as wind energy, causes...
Electricity market players operating in a liberalized environment requires access to an adequate decision support tool, allowing them to consider all the business opportunities and take strategic decisions. Ancillary services represent a good negotiation opportunity that must be considered by market players. For this, decision support tools must include ancillary market simulation. This paper proposes...
This paper proposes a simple, yet rigorous, model for MW dependent ramp rates. The model is formulated as mixed linear integer constraints, and is appropriate for Unit Commitment and multi-interval dispatch formulations used by Independent System Operators (ISO) and self-scheduled generators in electricity markets. 5-bus examples are used to demonstrate the value of the proposed model, as it guarantees...
This paper describes an undergraduate or graduate level student project that involves the design of an energy-efficient standalone distributed generation system integrating existing fossil fuel based energy sources with renewable energy sources and smart grid technologies for off-grid communities. One such application is the development of stand-alone electric power sources for Native American villages...
A common practice for the Ex Post LMP calculation at a number of US ISOs uses a small constant range, typically from -2.0 MW to +0.1 MW, as each generator's lower and upper bounds. However, this paper shows that this common practice lacks theoretic justification and may lead to inconsistent results. For example, if the ex post dispatch results are identical to the ex ante dispatch schedules, it is...
As power systems evolve to incorporate greater penetrations of variable renewables, the demand for flexibility within the system is increased. Combined Cycle Gas Turbines (CCGTs) are traditionally considered as inflexible units but those which incorporate a steam bypass stack are capable of open-cycle operation. Facilitating these units to operate in open-cycle mode is shown to improve system reliability...
This paper deals with a systematic way for modelling and visualising market power in liberalised electricity markets. The paper first introduces a new index termed the “Nodal Market Power” index, the NMP index. The NMP index is calculated based on the concept of “social welfare” in economics and the game theory in applied mathematics. The oligopoly electricity market is modelled through a non-cooperative...
Ireland has some of the most favourable wind conditions in the whole of Europe. Wind production, in the mainland as well as offshore, is expected to grow rapidly during the coming years, as evidenced by the fact that some 6000 MW of wind generation is currently awaiting connection to the grid onshore. Given the massive potential for the exploitation of renewable energy resources off the coast of Ireland,...
Southern California Edison Company, as well as the other California investor owned utilities are mandated to increase their Renewable Portfolio Standard to 20 percent by 2010 and by the Governor's Executive Order to 33 percent by 2020. When achieved, these types of energy resource assets potentially represent a significant means to meet State energy and environmental objectives. Edison is also embarking...
Electricity infrastructure touches us all - the key challenge, pertinent to this panel session, is to enable secure and very high-confidence sensing, communication and control of a heterogeneous, widely dispersed, yet globally interconnected system, which is a serious technological problem in any case. It is even more complex and difficult to control it for optimal efficiency and maximum benefit to...
Both deterministic and probabilistic approaches can be used to establish spinning reserve requirements. It has been proved that determining reserve requirements based on probabilistic approaches results in more economical efficiency. So, a probabilistic security constraint unit commitment problem (SCUC) is used to clear energy and spinning reserve simultaneously and to determine system spinning reserve...
The ability of the liberalised energy markets to trigger investment in the generation capacity required to maintain an acceptable level of security of supply risk has been - and will continue to be - a topic of much debate. Modelling the dynamics of investment in generation capacity can inform this debate. More precisely, if investment is viewed as a negative feedback control mechanism with energy...
Security and economy are long standing underpinnings for power system operation. The evolution from regulated utility operation to competitive markets operation led to more formalized treatment of economy and security concerns through the deployment of market clearing applications that are based mathematical programming methods. Among the most common market clearing applications are security-constrained...
This paper presents a forecasting technique to predict next-day electricity spot prices and volatilities. Our technique combines a fundamental model formulated as supply stack modeling, with an econometric analysis based on the GARCH methodology. Empirical results from the wholesale electricity market of Great Britain are discussed.
Renewable energy integration with the power systems will change the power systems in many ways. Renewable resources in remote areas will trigger extensive transmission upgrades to deliver green energy to the load centers. The intermittent and non-dispatchable characteristics of the renewable resources will impact both long-term system adequacy and real-time system security. Uncertainty of the development...
In current deregulated power markets, prices are determined in the economic dispatch problem with fixed unit commitment decisions. Start-up and no-load costs are not included in the prices and significant uplift payments have to be paid to generators. The convex hull pricing model was developed to include the fixed costs in setting prices by solving the dual of the unit commitment and economic dispatch...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.