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This paper presents a deterministic unified unit commitment and economic dispatch model that integrates storage devices in the short-term power system scheduling under high renewable energy penetration. The presented model is a single multi-hour look-ahead real time tool that uses multiple time resolution to reduce its computational requirements. Operating on a rolling basis, the decisions of the...
Recent studies have shown that multi-step optimization based on Model Predictive Control (MPC) can effectively coordinate the increasing number of distributed renewable energy and storage resources in the power system. However, the computation complexity of MPC is usually high which limits its use in practice. To improve the efficiency of MPC, in this paper, we apply a distributed optimization method...
Power system operators have traditionally addressed system uncertainty through the scheduling of operating reserves. These reserves are excess capacity, either online or offline, that can quickly be used to address unforeseen events in the load profile. As renewable energy resources, namely wind and solar, new techniques are being developed to address the uncertainty introduced from these sources...
This paper investigates the scheduling horizon of power system containing wind and concentrating solar power (CSP) plants with thermal energy storage (TES). CSP plant with TES can be used to reduce the uncertainty of renewable generation and provide services to power system. However, forecast error of wind/solar is strongly related to the forecast horizon. When CSP plant with TES is incorporated into...
Wind generation is traditionally treated as a non-dispatchable resource and is fully absorbed unless there are security issues. To tackle the operational reliability issues caused by the volatile and non-dispatchable wind generation, many dispatch frameworks have been proposed, including robust unit commitment (RUC) considering wind variation. One of the drawbacks that commonly exist in those dispatch...
This paper models the the reserve capacity procurement problem in Denmark to account for the sequential clearing of the reserve availability market and the energy market, and the forecast error of system wind power and demand. The problem is modeled as a stochastic mixed-integer bilevel linearing programming problem. A real case of Western Denmark is studied. In the case analyzed, the EENS induced...
Deregulation of energy market led to the development of flexible and efficient framework for energy trading by energy companies in a competitive environment. Both deregulation and the concern towards environment issues increased the number of small and medium renewable power plants distributed in the network. The variability of renewable energy sources and the lack of their central monitoring led...
This paper solves an optimization problem to minimize the emission due to carbon oxides, nitrogen oxides and sulfur oxides with cost as a constraint for a wind-solar-thermal power system. Wind and solar energy can reach significant penetration in modern power system and they will introduce additional uncertainties. Market price is mainly influenced by the generating fuel cost, as the wind and solar...
The use of renewable energy sources, such as wind power, is of major importance in future power grids for economic and environmental reasons, while the intermittent and stochastic nature of such energy brings challenges to system dispatch. Application of the virtual power plant (VPP) concept is one of the promising ways to improve utilization of renewable power. Among the many issues of practically...
If grid integration concerns have come to the fore in recent years as an issue that may impede the widespread deployment of wind generators into power systems, available scheduling algorithms to allow their seamless penetration to grid has lagged its explosive growth. This paper proposes a model to optimally commit generating units while simultaneously determining the geographical allocation of the...
Forecast uncertainty related to the power production from renewables frequently leads to significant changes between the scheduled and the actual power injections. Larger and more frequent fluctuations in the power production require new approaches to handle congestion and ensure system security. In this paper, we investigate how different strategies for reserve activation influence the cost of integrating...
Cyber Physical Power System (CPPS) has been recognized as the most promising enabling technology for integrating and coordinating computing, networking, and physical processes according to a holistic vision of the transmission system. In CPPS, the network components and the computing entities cooperate in order to collect pervasive electrical and meteorological data, identifying suitable control actions,...
The steady rise of electricity demand and renewable energy sources is increasing the need for flexibility to enable power systems to adapt to changes in supply and demand. To this end, demand response programs have the potential to increase the flexibility of the system. In this work, a direct-load-control demand response program is used in the scheduling task of a power system with high levels of...
Dependency on thermal generation and continued wind power growth in Europe due to renewable energy and greenhouse gas emissions targets has resulted in an interesting set of challenges for power systems. The variability of wind power impacts dispatch and balancing by grid operators, power plant operations by generating companies and market wholesale costs. This paper quantifies the effects of high...
With the increasing penetration of renewable resources in power systems, more operational flexibility is required to deal with the uncertainty of intermittent generation. In particular, fast acting regulation reserves are needed to maintain the load-generation balance. This paper focuses on evaluating the benefits of energy storage in providing regulation services for real-time operation. Among the...
A large integration of offshore wind power plants and the construction of an offshore transmission network is expected for the next years. This network is also expected to interconnect onshore transmission systems. A key question to this endeavour is whether this offshore network should be n-1 redundant like the onshore network, or whether the onshore power system is strong enough to cope with failures...
Power system operators schedule additional capacity above or below the amount required to meet the expected demand at any time interval to ensure reliable operation. This excess capacity is known as operating reserve. This reserve helps protect against the inherent variability and uncertainty found in the system. As more variable generation resources are connected to the system, the amount of variability...
This paper proposes an algorithm to find optimal spinning reserve in the system with wind power uncertainty by unit commitment problem with optimal generation dispatch considering EENS constraint. In this method, spinning reserve is included in the set of state variables to be minimized and consists of reserves which represent load uncertainty and wind power uncertainty. The EENS constraint is a function...
The integration of renewable generation into power system brings challenges and threats for the power system operation and planning. Transmission congestion is one of the most intricate problems. Congestion cost links the short-term system operation and long-term network planning. But few literature study the congestion cost over long term. The main innovation of this paper is to employ statistical...
In many power systems, fluctuating in-feed contributes a big share of total energy produced. This means new challenges to operate the system securely. In this paper, a risk-based method for security assessment of power systems is presented. The method takes the probability and severity of contingencies into account. The method proposed considers also the forecast errors of fluctuating in-feed and...
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