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Misra R.,Midcontinent Independent System Operator Inc. | Paudyal S.,Michigan Technological University
IEEE Power and Energy Society General Meeting | Year: 2015

Harmonic distortion on voltages and currents increases with the increased penetration of Plug-in Electric Vehicle (PEV) loads in distribution systems. Wind Generators (WGs), which are source of harmonic currents, have some common harmonic profiles with PEVs. Thus, WGs can be utilized to subside the effect of PEVs on harmonic distortion. This paper studies the impact of PEVs on harmonic distortions and integration of WGs to reduce it. A harmonic decoupled power flow model is developed, where PEVs and WGs are represented by harmonic current loads and sources, respectively. The developed model is first used to solve harmonic power flow on IEEE 34-node distribution test feeder with low, moderate, and high penetrations of PEVs, then its impact on total harmonic distortions (THDs) is studied. Next, optimal size of WGs are calculated using Genetic Algorithm in the test feeder to reduce voltage and current THDs below the IEEE recommended values. © 2015 IEEE. Source

Danandeh A.,University of South Florida | Zhao L.,Midcontinent Independent System Operator Inc. | Zhao L.,University of South Florida | Zeng B.,University of South Florida
IEEE Transactions on Smart Grid | Year: 2014

In this paper, we consider a job scheduling problem with random local generation, in which some jobs must be scheduled ahead of time while the others can be scheduled in a real-time fashion. To capture the randomness of the locally distributed generation, we develop a two-stage robust optimization model by considering an uncertainty set without probability information. Given that the problem is challenging, a nested column-and-constraint generation algorithm is implemented to find an optimal solution. Some computational study, along with management insights, is presented to show the effectiveness of the proposed model in dealing with the worst case situations. © 2014 IEEE. Source

Luo C.,Midcontinent Independent System Operator Inc. | Hou Y.,University of Hong Kong | Wen J.,Huazhong University of Science and Technology | Cheng S.,Huazhong University of Science and Technology
IEEE Transactions on Power Systems | Year: 2014

This paper gives the background and role of the market flow in the interregional congestion management process for market-based operating entity and describes the market flow methodology. It proposes that the market flow method calculates the same impact result on a flowgate as the unit dispatch system (UDS) flow does and proves it mathematically. The equivalence of market flow and UDS flow shows that the UDS flow change on a constraint due to the UDS binding will have the same effect on the change in the market flow under the electricity market operations. In addition, it proves that, in an interconnected system, the sum of the market flows of all of the market entities, the generation-to-load impacts of nonmarket entities, and the total tagged transaction impact among the entities is equal to the dc flow for any constraint. The assessment of market flow methodology demonstrates the effectiveness of using the market flow in the congestion management process and coordinated management of transmission constraints. The proposed methodology can help identify the cause of loop flow problem in power systems. The numerical results on a 23-bus test system and a 7917-bus system are also illustrated. © 2014 IEEE. Source

Brown N.A.,Iowa State University | Ajjarapu V.,Iowa State University | Navid N.,Midcontinent Independent System Operator Inc.
IEEE Power and Energy Society General Meeting | Year: 2014

Ramping products are planned or in effect in multiple power markets overseen by independent system operators (ISOs) in the United States (US). They are intended to provide flexibility in security-constrained economic dispatch, given higher uncertainty in net load (load minus non-dispatchable renewable power) due to higher wind penetration. When conventional generators respond to unforeseen wind ramps, transmission congestion can arise. In such situations, reserves may not be deliverable as power across the network. This paper presents an extension of the original Midcontinent Independent System Operator (MISO) ramping capability formulation. The key characteristic of this proposed deliverable ramping capability formulation is that it recognizes the magnitude of net load uncertainty by location. An example is given in which the economic dispatch with deliverable ramping capability avoids congestion. © 2014 IEEE. Source

Hou Y.,University of Hong Kong | Qin Z.,University of Hong Kong | Yan J.,Midcontinent Independent System Operator Inc.
IEEE Power and Energy Society General Meeting | Year: 2014

System restoration strategies are established and implemented based on the availabilities of components of a system. However, due to lack of accurate information, availabilities of some components may not be known during establishment of restoration strategies after a blackout. In this paper, a novel risk-based methodology is proposed for constructing restoration strategies with stochastic availability constraints for both individual components and restoration paths. Based on a stochastic model of the availability, a multistage stochastic optimization model is constructed. A bi-level method is used to solve the proposed model. The established restoration strategy is to achieve a reasonable restoration duration subjects to operating constraints and acceptable risk levels. The proposed risk constraints are introduced into the EPRI's System Restoration Navigator (SRN) with a little modification. Case studies demonstrate the proposed model and methods. © 2014 IEEE. Source

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