Blar i USN Open Archive på forfatter "Sharma, Roshan"
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Multistage Model Predictive Control with Simplified Method on Scenario Ensembles of Uncertainty for Hjartdøla Hydropower System
Jeong, Changhun; Sharma, Roshan (Chapter, 2023)Despite the many advantages associated with hydropower, the optimal operation of a hydropower system can be challenging due to various operational constraints and uncertainties, such as those related to weather forecasts ... -
Multistage Model Predictive Control with Simplified Scenario Ensembles for Robust Control of Hydropower Station
Jeong, Changhun; Furenes, Beathe; Sharma, Roshan (Peer reviewed; Journal article, 2023)This paper proposes simplification of the scenario ensembles that describe the uncertainty present in a hydropower plant. The simplified scenario tree is further used with a multistage model predictive control for optimal ... -
Nonlinear observer for hydropower system
Vytvytskyi, Liubomyr; Sharma, Roshan; Lie, Bernt (Peer reviewed; Journal article, 2019)Estimation of unmeasured states plays an essential role in the design of control systems as well as for monitoring of hydropower plants. The standard Kalman filter gives the optimum state estimates for linear systems. ... -
Optimal control strategies with nonlinear optimization for an Electric Submersible Pump lifted oil field
Sharma, Roshan; Glemmestad, Bjørn (Journal article; Peer reviewed, 2013)In an Electric Submersible Pump (ESP) lifted oil field, the ESP of each oil well should be operated inside its operating window. The total power consumed by the ESPs in the oil field should be minimized. The speed of the ... -
Optimal Operation of Processes Under Uncertainty Using Robust Model Predictive Control
Jayamanne, Kushila Rasanduni (Master thesis, 2021)Model Predictive Control (MPC) is a well-established technology for advanced control of many industrial processes. One of its main benefits is the ability to handle process constraints. However, accuracy of the process ... -
Optimal Operation of the Peat Drying Process in Steam Tube Dryers
Kulakovsky, Leonid; Rosen, Victor; Sharma, Roshan; Pfeiffer, Carlos Fernando; Lie, Bernt (Journal article; Peer reviewed, 2015-11-25)Ukraine is an energy-dependent country and aims to reduce the import of natural gas, heat, and power in general. This implies extracting fuel from her own natural resources; one relevant and readily available energy carrier ... -
Optimization of lift gas allocation in a gas lifted oil field as non-linear optimization problem.
Sharma, Roshan; Fjalestad, Kjetil; Glemmestad, Bjørn (Journal article; Peer reviewed, 2012)Proper allocation and distribution of lift gas is necessary for maximizing total oil production from a field with gas lifted oil wells. When the supply of the lift gas is limited, the total available gas should be optimally ... -
Parameter estimation for externally simulated thermal network models
Brastein, Ole Magnus; Lie, Bernt; Sharma, Roshan; Skeie, Nils-Olav (Peer reviewed; Journal article, 2019)Obtaining accurate dynamic models of building thermal behaviour requires a statistically solid foundation for estimating unknown parameters. This is especially important for thermal network grey-box models, since all their ... -
A Reactive Approach for Real-Time Optimization of Oil Production Under Uncertainty
Janatianghadikolaei, Nima; Sharma, Roshan (Peer reviewed; Journal article, 2023)This paper proposes a reactive approach based on the moving horizon estimation method for optimization in the presence of parametric uncertainty. The moving horizon estimation scheme uses measurable outputs in order to ... -
Real time control of robotic arm manipulators
Chowdhury, Mohammad Saifuddin (Master thesis, 2022)This thesis is based around creating an interface between a ROS-based robot arm and MATLAB, focusing mostly on robots in the industry. MATLAB will be used to implement a simulator of the robot and to create communication ... -
Real-time Optimization and Control for Oil Production under Uncertainty
Janatian, Nima (Doctoral dissertations at the University of South-Eastern Norway;179, Doctoral thesis, 2024-02-02)The practical use of model-based optimization depends significantly on the accuracy of the model in use. This is because the presence of uncertainty can introduce a mismatch between the model and the real plant, which may ... -
A robust model predictive control with constraint modification for gas lift allocation optimization
Janatianghadikolaei, Nima; Sharma, Roshan (Peer reviewed; Journal article, 2023)This paper presents a novel approach for implementing a robust real-time optimization framework under the presence of parametric uncertainty. Conservativeness is an inevitable drawback of a robust control approach. Therefore ... -
Robust MPC for optimal oil production under the presence of uncertainties
Gulløy, Ragnvald Leyser (Master thesis, 2022)Industries, business and private people often want to maximize income. The petroleum industry is no exception. Higher production leads to higher income. Model predictive control can help maximizing the production at oil ... -
Second Order KP Scheme for the Solution of flow in a Venturi Channel
Dissanayake, Susantha; Sharma, Roshan; Lie, Bernt (Journal article; Peer reviewed, 2018)In many different applications, a Venturi channel is used as a tool to compute fluid flow rates. The Saint-Venant equation is a hyperbolic type Partial Differential Equation (PDE) which can be used to model fluid flows ... -
Second order scheme for open channel flow
Sharma, Roshan (Professional article, 2015-08-26)In the search for a numerical scheme which: (i) is semi-descrete in nature (only space discritization) so that built-in ODE solvers in MATLAB or Modelica can be used, (ii) can handle dry bed conditions (island or dry ... -
Sensor placement and parameter identifiability in grey-box models of building thermal behaviour
Brastein, Ole Magnus; Sharma, Roshan; Skeie, Nils-Olav (Journal article; Peer reviewed, 2019)Building energy management systems can reduce energy consumption for space heating in existing buildings, by utilising Model Predictive Control. In such applications, good models of building thermal behaviour is important. ... -
Short-Term Production Optimization for Electric Submersible Pump Lifted Oil Field With Parametric Uncertainty
Janatianghadikolaei, Nima; Sharma, Roshan (Peer reviewed; Journal article, 2023)This paper uses a scenario-based optimization method to address the Daily Production Optimization from an Electric Submersible Pump lifted oil field under the presence of uncertainty. The primary contribution of this work ... -
Stochastic MPC for optimal operation of hydropower plant
Nabin, K. C. (Master thesis, 2022)Different categories of industries, such as manufacturing plants, power production plants etcetera, are equipped with a control mechanism to keep their process-variables of interest within the desired limit. Among different ... -
Stochastic MPC For Optimal Operation of Hydropower Station Under Uncertainty
Jeong, Changhun; Sharma, Roshan (Peer reviewed; Journal article, 2022)The operational condition at the Dalsfoss power station is complicated due to many requirements related to environmental regulations and safety constraints such as the seasonally varying water level requirement at the ... -
Third Order Reconstruction of the KP Scheme for Model of River Tinneselva
Dissanayake, Susantha; Sharma, Roshan; Lie, Bernt (Journal article; Peer reviewed, 2017)The Saint-Venant equation/Shallow Water Equation is used to simulate ow of river, ow of liquid in an open channel, tsunami etc. The Kurganov-Petrova (KP) scheme which was developed based on the local speed of discontinuity ...