Naslov
The Cetina river catchment control centre: Combining commercial and tailor-made solutions

Autori
Horvat, Branko ; Martinić, Ante ; Dabro, Mate ; Blažević, Tonći

Izvornik
The International Journal on Hydropower & Dams (1352-2523) 19 (2012), 6; 82-88

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
River catchment; control center; SCADA; forecasting; scheduling; optimisation; simulation; SOA

Sažetak
The Cetina river catchment hydro-energetic system (HES) in southern part of Republic of Croatia, owned by HEP (Croatian Electric Power Industry) – Production Ltd. (a subsidiary of HEP Group Inc.), incorporates two seasonal storage reservoirs, three compensation reservoirs and six hydroelectric power plants (HPP) of significant total power and electric energy production. Proper catchment supervision, production planning, operation and control, are of the utmost importance for the Croatian electric power system (EPS) functioning. Energy contribution of the catchment HPPs covers a significant part of electric energy needs and makes more than one fifth (2.3 TWh) of electric energy yearly average production. Significant amount of electric power installed in the catchment of 880 MW, large storage reservoirs of 600 and 800 hm3 and flexible compensation reservoirs, offer significant regulation possibilities and contribution in taking the peak load at daily basis for all planned operations and contingencies as well. HPPs taking dominant participation in EPS secondary control system achieve an additional contribution thanks to the balancing energy economic value.Economic value of the HES will obtain a realistic estimation not earlier than the environment of an open deregulated market is completely established. Fuel and energy import cost minimization are not sufficient measure for that evaluation. For many years the short-term generation scheduling for the Cetina HES has been done manually using Excel spreadsheets. The HPPs have been operated locally without remote data acquisition and automatic control. An improvement of the business process and operation automation could multiply profit from energy production as well as gain benefit from environment protection, flood control, melioration, and water supply. In 2007, HEP – Production (Employer) decided to start the construction of the Cetina river catchment control center (CSRCE). In 2008 Končar – Power Plant and Electric Traction Engineering Inc. (Contractor) was awarded the contract. The construction of the CSRCE started in 2008 and is currently approaching completion. The system will be tested and put into operation till the end of 2012. The system includes the following subsystems: SCADA, applications for forecasting, scheduling, optimization and simulation, data bases (real- time, study and archive), web applications, communication with controlled objects (HPPs), as well as data exchange with other users within or outside HEP Group. Furthermore, existing subsystems such as meteorology, hydrology and piezometric underground water data supervision and acquisition are integrated. The paper gives an overview of the CSRCE information system, its structure and the way of its exploitation. The CSRCE information system is object-oriented, component and standard based, enabling future upgrades with new modules form various vendors. The system will ensure secure and reliable operation by redundancy of critical functions at the hardware and software level. The system configuration is based on a redundant computer network interconnecting the system components and achieving secured connections to the users within or outside HEP Group. Information system is distributed and based on the Service Oriented Architecture (SOA) paradigm. Open and platform independent technologies are used as much as possible to ensure the possibility of current and future integration of systems in heterogeneous environments. SCADA utilizes an architecture designed to conform high demand real-time operation, large system data bases and WAN communication. Real-time automatic control functions contribute to EPS operation and security maintaining ; meanwhile the off-line applications are utilized for the purpose of planning and economy of the EPS. To implement the off-line applications, commercial program packages i.e. of- the-shelf software components were used. DHI MIKE 11 hydraulic modelling software is utilized for water flow prognostic and simulation purposes. For complex surface and subsurface karst forms determining water inflow, rainfall-runoff model is parameterised, calibrated and verified using historical data time series. DHI MIKE BASIN water resources management and planning software is used for short-term HES generation scheduling. IBM ILOG CPLEX solver with mixed integer linear programming (MILP) algorithm is incorporated for operation optimization. The main objective is to maximize the operational efficiency i.e. to minimize the amount of water used for demanded energy production. Profit maximization in a deregulated market can be done. Of-the-shelf components were wrapped and exposed as web services, and additional business logic and graphical user interface were implemented. Methodology is described. The quality of simulation and optimization models’ output never surpasses the quality of input information. To improve the planning process in the new CSRCE, it is necessary to have quality information and recently updated input data. Issues of data modelling and data collections are discussed, including the definition of the system model to be used in the applications, parameter identification as well as calibration and verification. The synergy of Contractor's specialists and operationally skilled Employer's staff could gain profit and pay out the investment.

Izvorni jezik
Engleski

Znanstvena područja
Elektrotehnika, Računarstvo

POVEZANOST RADA