Imperial College London

DrIvanStoianov

Faculty of EngineeringDepartment of Civil and Environmental Engineering

Senior Lecturer
 
 
 
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Contact

 

+44 (0)20 7594 6035ivan.stoianov Website

 
 
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Assistant

 

Miss Judith Barritt +44 (0)20 7594 5967

 
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Location

 

408Skempton BuildingSouth Kensington Campus

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Summary

 

Publications

Publication Type
Year
to

61 results found

Pecci F, Abraham E, Stoianov I, 2019, Model Reduction and Outer Approximation for Optimizing the Placement of Control Valves in Complex Water Networks, JOURNAL OF WATER RESOURCES PLANNING AND MANAGEMENT, Vol: 145, ISSN: 0733-9496

JOURNAL ARTICLE

Changklom J, Stoianov I, Redundant flow estimation methods for robust hydraulic control in water supply networks, Journal of Hydroinformatics, ISSN: 1464-7141

The implementation of robust hydraulic control in water supply networks relies upon the utilisation of redundant flow estimation methods. In this paper, we propose a novel model-based flow estimation method for diaphragm actuated globe valves based on three pressure signals, namely the valve inlet pressure, valve outlet pressure and control chamber pressure (the 3P flow estimation method). The proposed flow estimation method relies upon the accurate determination of a valve stem position based on a force balance analysis for the diaphragm of a valve, the measured pressure differential across a valve and the flow coefficients of a valve (Cv, Kv). A novel stem position estimation model for diaphragm actuated globe valves has been formulated and experimentally validated. The non-linear parameterised valve stem position estimation model results in multiple solutions. We combine advances in signal processing with support vector machine classification to find a correct solution. We compare the proposed 3P flow estimation method with a method, which uses stem position sensor measurements of a valve and two pressure signals. A unique set of experimental data have been acquired for performance validation. We derive uncertainty bounds for the proposed flow estimation method and demonstrate its application for robust pressure control in water supply networks.

JOURNAL ARTICLE

Wilson RE, Stoianov I, OHare D, 2019, Continuous Chlorine Detection in Drinking Water and a Review of New Detection Methods, Johnson Matthey Technology Review, ISSN: 2056-5135

JOURNAL ARTICLE

Armand H, Stoianov I, Graham N, 2018, Impact of network sectorisation on water quality management, Journal of Hydroinformatics, Vol: 20, Pages: 424-439, ISSN: 1464-7141

JOURNAL ARTICLE

Abraham E, Blokker M, Stoianov I, 2018, Decreasing the Discoloration Risk of Drinking Water Distribution Systems through Optimized Topological Changes and Optimal Flow Velocity Control, Journal of Water Resources Planning and Management, Vol: 144, Pages: 04017093-04017093, ISSN: 0733-9496

JOURNAL ARTICLE

Pecci F, Abraham E, Stoianov I, 2018, Global optimality bounds for the placement of control valves in water supply networks, Optimization and Engineering, ISSN: 1389-4420

© 2018, The Author(s). This manuscript investigates the problem of optimal placement of control valves in water supply networks, where the objective is to minimize average zone pressure. The problem formulation results in a nonconvex mixed integer nonlinear program (MINLP). Due to its complex mathematical structure, previous literature has solved this nonconvex MINLP using heuristics or local optimization methods, which do not provide guarantees on the global optimality of the computed valve configurations. In our approach, we implement a branch and bound method to obtain certified bounds on the optimality gap of the solutions. The algorithm relies on the solution of mixed integer linear programs, whose formulations include linear relaxations of the nonconvex hydraulic constraints. We investigate the implementation and performance of different linear relaxation schemes. In addition, a tailored domain reduction procedure is implemented to tighten the relaxations. The developed methods are evaluated using two benchmark water supply networks and an operational water supply network from the UK. The proposed approaches are shown to outperform state-of-the-art global optimization solvers for the considered benchmark water supply networks. The branch and bound algorithm converges to good quality feasible solutions in most instances, with bounds on the optimality gap that are comparable to the level of parameter uncertainty usually experienced in water supply network models.

JOURNAL ARTICLE

Abraham E, Stoianov I, 2017, Constraint-Preconditioned Inexact Newton Method for Hydraulic Simulation of Large-Scale Water Distribution Networks, IEEE Transactions on Control of Network Systems, Vol: 4, Pages: 610-619

JOURNAL ARTICLE

Pecci F, Abraham E, Stoianov I, 2017, Quadratic head loss approximations for optimisation problems in water supply networks, JOURNAL OF HYDROINFORMATICS, Vol: 19, Pages: 493-506, ISSN: 1464-7141

JOURNAL ARTICLE

Pecci F, Abraham E, Stoianov I, 2017, Penalty and relaxation methods for the optimal placement and operation of control valves in water supply networks, COMPUTATIONAL OPTIMIZATION AND APPLICATIONS, Vol: 67, Pages: 201-223, ISSN: 0926-6003

JOURNAL ARTICLE

Menke R, Kadehjian K, Abraham E, Stoianov IIet al., Investigating trade-offs between the operating cost and green house gas emissions from water distribution systems, Sustainable Energy Technologies and Assessments, ISSN: 2213-1388

JOURNAL ARTICLE

Pecci F, Abraham E, Stoianov I, 2017, Scalable Pareto set generation for multiobjective co-design problems in water distribution networks: a continuous relaxation approach, STRUCTURAL AND MULTIDISCIPLINARY OPTIMIZATION, Vol: 55, Pages: 857-869, ISSN: 1615-147X

JOURNAL ARTICLE

Menke R, Abraham E, Parpas P, Stoianov Iet al., 2017, Extending the envelope of demand response provision though variable speed pumps, 18th International Conference on Water Distribution System Analysis (WDSA), Publisher: ELSEVIER SCIENCE BV, Pages: 584-591, ISSN: 1877-7058

CONFERENCE PAPER

Pecci F, Abraham E, Stoianov I, 2017, Outer approximation methods for the solution of co-design optimisation problems in water distribution networks, 20th World Congress of the International-Federation-of-Automatic-Control (IFAC), Publisher: ELSEVIER SCIENCE BV, Pages: 5373-5379, ISSN: 2405-8963

CONFERENCE PAPER

Armand H, Stoianov II, Graham NJD, 2017, A holistic assessment of discolouration processes in water distribution networks, URBAN WATER JOURNAL, Vol: 14, Pages: 263-277, ISSN: 1573-062X

JOURNAL ARTICLE

Menke R, Abraham E, Parpas P, Stoianov Iet al., 2016, Exploring Optimal Pump Scheduling in Water Distribution Networks with Branch and Bound Methods, WATER RESOURCES MANAGEMENT, Vol: 30, Pages: 5333-5349, ISSN: 0920-4741

JOURNAL ARTICLE

Wilson RE, Stoianov I, O'Hare D, 2016, Biofouling and in situ electrochemical cleaning of a boron-doped diamond free chlorine sensor, ELECTROCHEMISTRY COMMUNICATIONS, Vol: 71, Pages: 79-83, ISSN: 1388-2481

JOURNAL ARTICLE

Menke R, Abraham E, Stoianov I, 2016, Modeling Variable Speed Pumps for Optimal Pump Scheduling, World Environmental and Water Resources Congress 2016, Publisher: American Society of Civil Engineers

CONFERENCE PAPER

Menke R, Abraham E, Parpas P, Stoianov Iet al., 2016, Demonstrating demand response from water distribution system through pump scheduling, APPLIED ENERGY, Vol: 170, Pages: 377-387, ISSN: 0306-2619

JOURNAL ARTICLE

Abraham E, Stoianov I, 2016, Sparse Null Space Algorithms for Hydraulic Analysis of Large-Scale Water Supply Networks, Journal of Hydraulic Engineering, Vol: 142, Pages: 04015058-04015058, ISSN: 0733-9429

JOURNAL ARTICLE

Herrera M, Abraham E, Stoianov I, 2016, A Graph-Theoretic Framework for Assessing the Resilience of Sectorised Water Distribution Networks, Water Resources Management, Vol: 30, Pages: 1685-1699, ISSN: 0920-4741

JOURNAL ARTICLE

Abraham E, Stoianov I, An efficient null space inexact Newton method for hydraulic simulation of water distribution networks, ArXiv e-prints

JOURNAL ARTICLE

Wright R, Abraham E, Parpas P, Stoianov Iet al., 2015, Control of water distribution networks with dynamic DMA topology using strictly feasible sequential convex programming, WATER RESOURCES RESEARCH, Vol: 51, Pages: 9925-9941, ISSN: 0043-1397

JOURNAL ARTICLE

Menke R, Abraham E, Parpas P, Stoianov Iet al., 2015, Approximation of system components for pump scheduling optimisation, Computing and Control for the Water Industry (CCWI2015)- Sharing the Best Practice in Water Management, Publisher: ELSEVIER SCIENCE BV, Pages: 1059-1068, ISSN: 1877-7058

CONFERENCE PAPER

Armand H, Stoianov I, Graham N, 2015, Investigating the impact of sectorized networks on discoloration, Computing and Control for the Water Industry (CCWI2015)- Sharing the Best Practice in Water Management, Publisher: ELSEVIER SCIENCE BV, Pages: 407-415, ISSN: 1877-7058

CONFERENCE PAPER

Wright R, Abraham E, Parpas P, Stoianov Iet al., 2015, Optimized control of pressure reducing valves in water distribution networks with dynamic topology, Computing and Control for the Water Industry (CCWI2015)- Sharing the Best Practice in Water Management, Publisher: ELSEVIER SCIENCE BV, Pages: 1003-1011, ISSN: 1877-7058

CONFERENCE PAPER

Wright R, Herrera M, Parpas P, Stoianov Iet al., 2015, Hydraulic resilience index for the critical link analysis of multi-feed water distribution networks, Computing and Control for the Water Industry (CCWI2015)- Sharing the Best Practice in Water Management, Publisher: ELSEVIER SCIENCE BV, Pages: 1249-1258, ISSN: 1877-7058

CONFERENCE PAPER

Pecci F, Abraham E, Stoianov I, 2015, Mathematical programming methods for pressure management in water distribution systems, Computing and Control for the Water Industry (CCWI2015)- Sharing the Best Practice in Water Management, Publisher: ELSEVIER SCIENCE BV, Pages: 937-946, ISSN: 1877-7058

CONFERENCE PAPER

Wright R, Parpas P, Stoianov I, 2015, Experimental investigation of resilience and pressure management in water distribution networks, Computing and Control for the Water Industry (CCWI2015)- Sharing the Best Practice in Water Management, Publisher: ELSEVIER SCIENCE BV, Pages: 643-652, ISSN: 1877-7058

CONFERENCE PAPER

Abraham E, Stoianov I, 2015, Efficient Preconditioned Iterative Methods for Hydraulic Simulation of Large Scale Water Distribution Networks, Pages: 623-632, ISSN: 1877-7058

CONFERENCE PAPER

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