Jure Margeta

Multiple reservoir system operational planning using multi-criterion decision analysis

Abstract Reservoir system operators must consider multiple quantitative and qualitative operational objectives with varying degrees of importance. A two-stage procedure combining multi-objective optimization and multi-criterion decision analysis techniques is presented for reservoir system operational planning. Objectives are divided into primary and secondary groups. In the first stage of the procedure, primary quantitative operational objectives are used to generate non-dominated alternatives via multi-objective optimization using successive linear programming and the e-constraint method. In the second stage, primary and secondary operation objectives are combined within multi-criterion decision techniques to select the most preferred alternatives from the generated set. Four multi-criterion decision analysis techniques were evaluated in this study. The two-stage procedure is demonstrated by application to the Han River Basin in Korea.

Sustainable Electric Power System: Is It Possible? Case Study: Croatia

This paper analyzes the reality of sustainable energy supply (SEPS) from renewable energy sources (RES) as a totally green strategy of electric energy production. The paper is based on the Advanced International Policies (AIP) scenario of the European Renewable Energy Council agency forecast by the year 2040, which foresees the share of 82% of RES, extended to 100% of RES. The key element that creates conditions for achieving this ambitious scenario is an innovative solution of the so-called solar hydroelectric power plant (SHE) which is basically combined photovoltaic (PV) power plant and pump storage hydro (PSH) which can provide continuous supply of electric power and energy to consumers. Therefore, SHE is presented in this paper as the main building element of the future SEPS. For covering unit consumption of electric energy of 1 GWh in a power system, the paper calculates unit values of the SHE system: 0.73 MW of PV generator; 4,545  m2 of PV generator; 0.36  hm3 of reservoir volume, 0.21 GWh of PSH ...

Introduction of PV Energy Into an Existing HEP

This paper analyzes a possibility of upgrading hydroelectric plant (HEP) with solar photovoltaic (PV) generator. The main objective of this solution is maximization of green energy production in accordance with local and existing HEP framework. The example of HEP Zavrelje/Dubrovnik in Croatia was used as a paradigm of such exploitation of RES. The results of the analysis confirm that the proposed solution of hybrid work PV-HEP system is natural, realistic, and very promising. By hybridization of these two main natural energy sources, the characteristics of both energy sources are enhanced. The application of such hybrid systems would increase the share of green energy in the electric power systems and thus reduce the CO2 emission from energy sources.

Role of Water-Energy Storage in PV-PSH Power Plant Development

This paper presents the characteristics of a power plant that combines renewable energy sources (RES), that is, a photovoltaic (PV) power plant and pump storage hydroelectric (PSH), to achieve sustainable production of green electric energy equal to that of conventional energy sources. The proposed solution does not produce CO2 and does not significantly use freshwater or other resources. The PSH storage is the main element of the proposed power plant system, which provides a continuous and reliable supply of green energy. Its size significantly affects the size of the PV generator and operation characteristics of the hybrid plant. The paper elaborates in detail the functional relationship between the choice of the PV generator power and the PSH upper storage volume and presents the basic mathematical relations. The algorithm of the system development is presented, along with the procedure choice solutions. The results from the case study show that the concept is flexible in design, construction, and oper...

Model for Reservoir Operations During Periods of High Flow

A combined dynamic programming optimization and hydraulic simulation model is presented for the analysis of the operation of hydroelectric reservoir facilities during periods of flood flows. The model is specifically designed to analyze the impacts of reservoir operations on upstream flooding and to consider complex reservoir outlet works. The model was applied to analyze the design and operational strategies for the Visegrad Hydroelectric Project in Yugoslavia. Results of the analysis indicated that the most economical means of flood protection for upstream areas was a combination of flood protection structures and a lowering of the reservoir storage level in anticipation of flood flows.

Integrated Management of Coastal Sewerage Systems: The Case of Kaštela Bay, Croatia

In the last 50 years, the broader Split area underwent anintensive development and urbanisation. Unfortunately, intensivedevelopment has not been followed by equally intensiveinfrastructure construction, especially wastewater infrastructure.In less than four decades, this attractive and beautiful, valuabletourist area, is turned into extremely degraded environment withvery polluted coastal sea. In order to solve the problem and avoidfurther unwanted consequences, it has been planned to introduceintegrated management of the environment. The priority was givento collection, treatment and disposal of industrial and urbanwastewater. As a result, an integrated project of wastewatersystem development was proposed that had been in realisation since1996. The problem solving requires an adequate organisation andsupport i.e. application of the decision support system (DSS)presented in this article. The DSS ensures horizontal integration,with a view to provide for co-operation between different sectorsand local communities, and vertical integration among severalauthorised administrative and management levels, all aiming at co-ordination and harmonisation in implementation of the adoptedproblem solution policy.

Multicriteria ranking wastewater disposal alternatives for coastal towns

ABSTRACT The main economic activity of the Poljicha Riviera in Yugoslavia as well as otherparts of the Adriatic coast is tourism. This activity can be successfully developed if numerous conditions are satisfied among which one of the most important is a clear sea. The region of the Poljicha Riviera has unique characteristics with regard to the problem of waste water disposal. Tourism activities create significant oscillations in the quantity of waste water to be treated. The conditions necessary for solving these problems in Yugoslavia are not very favorable considering both financial and technological aspects. Various criteria must be considered to find the most appropriate solutions. Besides economic criteria, other criteria must also be taken into account, such as social, technical, and environmental. Multicriteria analysis is a useful approach to analyze such complex problems that include conflicting criteria. This paper presents alternatives for solving the wastewater disposal problem in the region o...

Selection of the flood management solution of karstic field: Vrgorsko polje case study

Abstract Water resources management in karst areas is a very complex task, especially with regard to solving the problem of floods and protection against pollution. This is also true for flood protection of Vrgorsko polje, which is the subject of this paper. Complexity of water system and socio-economic characteristics in the broader area requires integral problem solving through analyses of several alternatives with different technical and technological features as well as different socio-economic and ecological impacts. In this paper, an elaborated integral approach to problem solving is presented as well as system analyses and the procedure of multicriteria selection of an optimum solution for karstic polje flood protection. The problem was successfully solved using the procedure with two basic steps. The first step analyzed possible basic solution concepts while the second analyzed engineering solutions in compliance with the adopted concepts. The results confirm the validity of this approach, which resulted in the elaboration of a flood protection project that was acceptable for all participants in the system.

Coupled optimization-simulation water quality model for regional water quality management

The objective pursued in water quality management is to secure water qualities such that marginal cost of the cleaning water equals the accuring marginal benefits. It is the purpose of this paper to show how the methods of system analysis may be used to plan more economical new pollution control facilities or how to upgrade existing systems. The particular problem investigated is the following: Given a region with a number of industries and/or municipalities, where should one build treatment plants and will be necessary levels that total regional cost of waste water treatment is minimum. To approach these problems, a stream water quality simulation is linked with a treatment cost minimization model in order to capitalize on the unique adventage of each in managing river basin water quality.

Closure to “Sustainable Electric Power System: Is It Possible? Case Study: Croatia” by Zvonimir Glasnovic and Jure Margeta

We thank the author, Dr. Dejan Brkic, for additional information about the features of energy resources and the state of the power system in Croatia.