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Project Goal: Wind energy integration in Low Inertia Power System
Current Stage: Analyzing data and performing simulations
Igor Kuzle; Ninoslav Holjevac; Ning Zhang; Chonqing Kang. Guest editorial introduction to the special issue on “advanced power system and smart integration of renewables”. Electric Power Systems Research 2021, 199, 107460 .
AMA StyleIgor Kuzle, Ninoslav Holjevac, Ning Zhang, Chonqing Kang. Guest editorial introduction to the special issue on “advanced power system and smart integration of renewables”. Electric Power Systems Research. 2021; 199 ():107460.
Chicago/Turabian StyleIgor Kuzle; Ninoslav Holjevac; Ning Zhang; Chonqing Kang. 2021. "Guest editorial introduction to the special issue on “advanced power system and smart integration of renewables”." Electric Power Systems Research 199, no. : 107460.
The most commonly used method for including photovoltaic system in the control of system frequency is to operate a PV power plant at reduced power while maintaining a specific amount of available power reserve. Such operating regime, often referred to as de-loaded, can cause additional costs and, consequently, determining a required power reduction becomes vitally important. This paper introduces a method for determining the required minimum de-loaded reserve of a photovoltaic system. To achieve the desired result a parabolic approximation of the system frequency response is developed to derive an explicit function of the frequency nadir. Taking this approximation into consideration, a method for determining the required minimum de-loaded margin was developed and tested in a case-study which observed a small power system consisting of several power plants. To demonstrate the accuracy of the proposed parabolic approximation, the calculated approximate values of the frequency nadir were compared to the values of the frequency nadir obtained from the frequency response simulations performed on the power system model developed in MATLAB/Simulink.
Tomislav Baskarad; Igor Kuzle; Ninoslav Holjevac. Photovoltaic System Power Reserve Determination Using Parabolic Approximation of Frequency Response. IEEE Transactions on Smart Grid 2021, 12, 3175 -3184.
AMA StyleTomislav Baskarad, Igor Kuzle, Ninoslav Holjevac. Photovoltaic System Power Reserve Determination Using Parabolic Approximation of Frequency Response. IEEE Transactions on Smart Grid. 2021; 12 (4):3175-3184.
Chicago/Turabian StyleTomislav Baskarad; Igor Kuzle; Ninoslav Holjevac. 2021. "Photovoltaic System Power Reserve Determination Using Parabolic Approximation of Frequency Response." IEEE Transactions on Smart Grid 12, no. 4: 3175-3184.
This paper presents a high-level overview of the integration of renewable energy sources (RES), primarily wind and solar, into the electric power system (EPS) in Croatia. It presents transmission system integration aspects for the particular case of this country. It explains the current situation and technical characteristics of the current conventional generation units and currently installed wind energy capacities. Based on the current situation future development scenario is determined and used to evaluate the impacts of the wide-scale integration of renewables. Grid connections aspects, power balancing, market participation, and inertia reduction aspects are considered. Furthermore, some specifics of both solar and wind integration are discussed identifying problems and potential solutions. Primarily through the provision of the inertial response of both solar and wind and through better forecasting of wind production. Finally, the outlook for the Croatian power system is given, that will most probably double its RES capacity in the coming 3-year period and a certain level of investments and changes of current operational practices will need to be provided.
Ninoslav Holjevac; Tomislav Baškarad; Josip Đaković; Matej Krpan; Matija Zidar; Igor Kuzle. Challenges of High Renewable Energy Sources Integration in Power Systems—The Case of Croatia. Energies 2021, 14, 1047 .
AMA StyleNinoslav Holjevac, Tomislav Baškarad, Josip Đaković, Matej Krpan, Matija Zidar, Igor Kuzle. Challenges of High Renewable Energy Sources Integration in Power Systems—The Case of Croatia. Energies. 2021; 14 (4):1047.
Chicago/Turabian StyleNinoslav Holjevac; Tomislav Baškarad; Josip Đaković; Matej Krpan; Matija Zidar; Igor Kuzle. 2021. "Challenges of High Renewable Energy Sources Integration in Power Systems—The Case of Croatia." Energies 14, no. 4: 1047.
Generic dynamic models of hydraulic turbines are unable to capture power oscillations phenomena originating from a torque disturbance on a single runner blade. In this paper, an improved dynamic model of a double-regulated hydraulic turbine which takes into account torque oscillations identified from draft tube pressure measurements was presented. It was experimentally identified that specific power oscillations of a bulb turbine operating with low tailwater level can be connected to cavitation-related phenomena on a single runner blade. Furthermore, it was shown that these oscillations do not originate from grid fault-induced resonance between the turbine rotor and generator, nor from the excitation system. The proposed simulation model was validated against measurement data of hydro power plant Dubrava and the validation shows good agreement between measured and simulated results.
Miljenko Brezovec; Igor Kuzle; Matej Krpan; Ninoslav Holjevac. Improved dynamic model of a bulb turbine-generator for analysing oscillations caused by mechanical torque disturbance on a runner blade. International Journal of Electrical Power & Energy Systems 2020, 119, 105929 .
AMA StyleMiljenko Brezovec, Igor Kuzle, Matej Krpan, Ninoslav Holjevac. Improved dynamic model of a bulb turbine-generator for analysing oscillations caused by mechanical torque disturbance on a runner blade. International Journal of Electrical Power & Energy Systems. 2020; 119 ():105929.
Chicago/Turabian StyleMiljenko Brezovec; Igor Kuzle; Matej Krpan; Ninoslav Holjevac. 2020. "Improved dynamic model of a bulb turbine-generator for analysing oscillations caused by mechanical torque disturbance on a runner blade." International Journal of Electrical Power & Energy Systems 119, no. : 105929.
The paper introduces, describes and analyses the specific power oscillations in hydroelectric power plant Dubrava that can appear in large bulb turbines operating with low tailwater levels. The procedure for the identification of the cause of oscillations is described and it is experimentally shown that the cause of power oscillations is a disturbance on a specific runner blade. The physical background of the cavitation-related phenomena that causes these oscillations is presented. Furthermore, it is shown that neither the automatic voltage regulator nor the transmission network disturbance is the source of oscillations, while the power system stabiliser can only partially damp them. Power oscillations reduce the average power output due to the operation in the unsteady output zone. These oscillations can cause damage to the equipment and reduce its lifespan. The effectiveness of various measures for treatment of these oscillations is discussed. A simple model for simulation of these oscillations is shown and verified against measurements.
Miljenko Brezovec; Igor Kuzle; Matej Krpan; Ninoslav Holjevac. Analysis and treatment of power oscillations in hydropower plant Dubrava. IET Renewable Power Generation 2019, 14, 80 -89.
AMA StyleMiljenko Brezovec, Igor Kuzle, Matej Krpan, Ninoslav Holjevac. Analysis and treatment of power oscillations in hydropower plant Dubrava. IET Renewable Power Generation. 2019; 14 (1):80-89.
Chicago/Turabian StyleMiljenko Brezovec; Igor Kuzle; Matej Krpan; Ninoslav Holjevac. 2019. "Analysis and treatment of power oscillations in hydropower plant Dubrava." IET Renewable Power Generation 14, no. 1: 80-89.
Multi-energy systems (MES) contribute to increasing energy utilization efficiency and renewable energy accommodation by coupling multiple energy sectors. Beijing is planning to build a subsidiary administrative center in Tongzhou District. A new MES will be built in this center from scratch to jointly meet electricity, heat and cooling demands. This raises the need for optimizing the configuration of MES from scratch at the planning stage. In this paper, the configuration planning of the MES in Beijing’s new subsidiary administrative center is conducted using a two-stage mixed-integer linear programming (MILP) approach based on the energy hub (EH) model. Given the load demand, distributed renewable energy sources, energy prices and candidate system component parameters, the MES configuration planning, equipment selection and capacity planning are jointly managed without limiting the possibility of MES configuration. A sensitivity analysis is performed to show the impacts of load profiles and energy prices on the optimal MES configuration. Operation simulations are carried out based on the obtained optimal planning scheme and another four alternative planning schemes presented by Beijing subsidiary administrative center. The operating cost, CO2 emission and overall system efficiency of each planning scheme are calculated and compared with each other.
Wujing Huang; Ning Zhang; Chongqing Kang; Tomislav Capuder; Ninoslav Holjevac; Igor Kuzle. Beijing subsidiary administrative center multi-energy systems: An optimal configuration planning. Electric Power Systems Research 2019, 179, 106082 .
AMA StyleWujing Huang, Ning Zhang, Chongqing Kang, Tomislav Capuder, Ninoslav Holjevac, Igor Kuzle. Beijing subsidiary administrative center multi-energy systems: An optimal configuration planning. Electric Power Systems Research. 2019; 179 ():106082.
Chicago/Turabian StyleWujing Huang; Ning Zhang; Chongqing Kang; Tomislav Capuder; Ninoslav Holjevac; Igor Kuzle. 2019. "Beijing subsidiary administrative center multi-energy systems: An optimal configuration planning." Electric Power Systems Research 179, no. : 106082.
More and more countries and utilities are trying to develop smart grid projects to make transformation of their power infrastructure towards future grids with increased share of renewable energy production and near zero emissions. The intermittent nature of solar and wind power can in general cause large problems for power system control. Parallel to this process, the aging of existing infrastructure also imposes requirements to utility budgets in the form of a need for large capital investments in reconstruction or maintenance of key equipment. Synchrophasor and other synchronized measurement technologies are setting themselves as one of the solutions for larger wind power integration. With that aim, in this paper one possible solution for wind power control through data mining algorithms used on a large quantity of data gathered from phasor measurement units (PMU) is described. Developed model and algorithm are tested on an IEEE 14 bus test system as well as on real measurements made on wind power plants currently in operation. One such wind power plant is connected to the distribution grid and the other one to the transmission grid. Results are analyzed and compared.
Mario Klarić; Igor Kuzle; Ninoslav Holjevac. Wind Power Monitoring and Control Based on Synchrophasor Measurement Data Mining. Energies 2018, 11, 3525 .
AMA StyleMario Klarić, Igor Kuzle, Ninoslav Holjevac. Wind Power Monitoring and Control Based on Synchrophasor Measurement Data Mining. Energies. 2018; 11 (12):3525.
Chicago/Turabian StyleMario Klarić; Igor Kuzle; Ninoslav Holjevac. 2018. "Wind Power Monitoring and Control Based on Synchrophasor Measurement Data Mining." Energies 11, no. 12: 3525.
Design process of the Wide area monitoring, protection and control system (WAMPAC) in control rooms consists of many project phases. Crucial part is to determine parameters for alarms triggering and setting parameters for control and protection modules. Integral segment is to define key performance indices (KPIs) through verified simulation models. Therefore, simulation scenarios were created to define key performance indices for both normal operation events and for various disturbances in the transmission network. Most significant results for setting of angle stability protection parameters are presented in this paper.
Igor Ivankovic; Igor Kuzle; Ninoslav Holjevac. Key Performance Indicies for Angle Stability Protection Function in WAMPAC System. 2018 IEEE Power & Energy Society General Meeting (PESGM) 2018, 1 -5.
AMA StyleIgor Ivankovic, Igor Kuzle, Ninoslav Holjevac. Key Performance Indicies for Angle Stability Protection Function in WAMPAC System. 2018 IEEE Power & Energy Society General Meeting (PESGM). 2018; ():1-5.
Chicago/Turabian StyleIgor Ivankovic; Igor Kuzle; Ninoslav Holjevac. 2018. "Key Performance Indicies for Angle Stability Protection Function in WAMPAC System." 2018 IEEE Power & Energy Society General Meeting (PESGM) , no. : 1-5.
Ninoslav Holjevac; Tomislav Capuder; Igor Kuzle; Ning Zhang; Chongquing Kang. Modelling Aspects of Flexible Multi-Energy Microgrids. 2018 Power Systems Computation Conference (PSCC) 2018, 1 .
AMA StyleNinoslav Holjevac, Tomislav Capuder, Igor Kuzle, Ning Zhang, Chongquing Kang. Modelling Aspects of Flexible Multi-Energy Microgrids. 2018 Power Systems Computation Conference (PSCC). 2018; ():1.
Chicago/Turabian StyleNinoslav Holjevac; Tomislav Capuder; Igor Kuzle; Ning Zhang; Chongquing Kang. 2018. "Modelling Aspects of Flexible Multi-Energy Microgrids." 2018 Power Systems Computation Conference (PSCC) , no. : 1.
For the developed dynamic angle instability simulation framework a reference IEEE 9 bus model was adapted and created in Matlab simulation environment. Model was validated and verified with available real operation historical data and fine tuning process was conducted. With the reference model, flexible platform for study work in the field of transmission network behavior during disturbances was created. Series of simulation scenarios were done analyzing dynamic angle instability: from a wide range of small active power oscillations to larger active power oscillations and out-of-step conditions occurrence. The paper is not oriented towards operations analyses of generators rather observes and enhances protection functions of the transmission lines in the transmission system. Simulation data that is generated is used to create setting parameter sets for protection functions in the proposed Wide Area Monitoring Protection and Control (WAMPAC) system, utilizing simulated synchrophasor measurements.
Igor Ivankovic; Igor Kuzle; Ninoslav Holjevac. Dynamic Angle Instability Simulation Framework Based on Reference Model Platform. 2018 IEEE International Conference on Environment and Electrical Engineering and 2018 IEEE Industrial and Commercial Power Systems Europe (EEEIC / I&CPS Europe) 2018, 1 -6.
AMA StyleIgor Ivankovic, Igor Kuzle, Ninoslav Holjevac. Dynamic Angle Instability Simulation Framework Based on Reference Model Platform. 2018 IEEE International Conference on Environment and Electrical Engineering and 2018 IEEE Industrial and Commercial Power Systems Europe (EEEIC / I&CPS Europe). 2018; ():1-6.
Chicago/Turabian StyleIgor Ivankovic; Igor Kuzle; Ninoslav Holjevac. 2018. "Dynamic Angle Instability Simulation Framework Based on Reference Model Platform." 2018 IEEE International Conference on Environment and Electrical Engineering and 2018 IEEE Industrial and Commercial Power Systems Europe (EEEIC / I&CPS Europe) , no. : 1-6.
In wide area monitoring, protection, and control (WAMPAC) systems, angle stability of transmission network is monitored using data from phasor measurement units (PMU) placed on transmission lines. Based on this PMU data stream advanced algorithm for out-of-step condition detection and early warning issuing is developed. The algorithm based on theoretical background described in this paper is backed up by the data and results from corresponding simulations done in Matlab environment. Presented results aim to provide the insights of the potential benefits, such as fast and efficient detection and reaction to angle instability, this algorithm can have on the improvement of the power system protection. Accordingly, suggestion is given how the developed algorithm can be implemented in protection segments of the WAMPAC systems in the transmission system operator control centers.
Igor Ivanković; Igor Kuzle; Ninoslav Holjevac. Algorithm for Fast and Efficient Detection and Reaction to Angle Instability Conditions Using Phasor Measurement Unit Data. Energies 2018, 11, 681 .
AMA StyleIgor Ivanković, Igor Kuzle, Ninoslav Holjevac. Algorithm for Fast and Efficient Detection and Reaction to Angle Instability Conditions Using Phasor Measurement Unit Data. Energies. 2018; 11 (3):681.
Chicago/Turabian StyleIgor Ivanković; Igor Kuzle; Ninoslav Holjevac. 2018. "Algorithm for Fast and Efficient Detection and Reaction to Angle Instability Conditions Using Phasor Measurement Unit Data." Energies 11, no. 3: 681.
Ninoslav Holjevac; Tomislav Capuder; Ning Zhang; Igor Kuzle; Chongqing Kang. Corrective receding horizon scheduling of flexible distributed multi-energy microgrids. Applied Energy 2017, 207, 176 -194.
AMA StyleNinoslav Holjevac, Tomislav Capuder, Ning Zhang, Igor Kuzle, Chongqing Kang. Corrective receding horizon scheduling of flexible distributed multi-energy microgrids. Applied Energy. 2017; 207 ():176-194.
Chicago/Turabian StyleNinoslav Holjevac; Tomislav Capuder; Ning Zhang; Igor Kuzle; Chongqing Kang. 2017. "Corrective receding horizon scheduling of flexible distributed multi-energy microgrids." Applied Energy 207, no. : 176-194.
In wide area monitoring, protection and control systems (WAMPAC), angle stability of transmission network is monitored using data from phasor measurement units (PMU) placed on transmission lines. Based on PMU data stream measurements advanced algorithm in order to detect and issue an early warning for out-of-step conditions is developed. That research hypothesis and algorithm is described in this paper. Data and results from corresponding simulations done in Matlab environment are elaborated and explained to provide the insights of the potential benefits. This algorithm will be adjusted for implementation in protection segments of WAMPAC systems in the transmission system operator central control centers.
Igor Ivankovic; Igor Kuzle; Ninoslav Holjevac. Algorithm for out-of-step condition detection and early warning using phasor measurement unit data. 2017 IEEE International Conference on Environment and Electrical Engineering and 2017 IEEE Industrial and Commercial Power Systems Europe (EEEIC / I&CPS Europe) 2017, 1 -6.
AMA StyleIgor Ivankovic, Igor Kuzle, Ninoslav Holjevac. Algorithm for out-of-step condition detection and early warning using phasor measurement unit data. 2017 IEEE International Conference on Environment and Electrical Engineering and 2017 IEEE Industrial and Commercial Power Systems Europe (EEEIC / I&CPS Europe). 2017; ():1-6.
Chicago/Turabian StyleIgor Ivankovic; Igor Kuzle; Ninoslav Holjevac. 2017. "Algorithm for out-of-step condition detection and early warning using phasor measurement unit data." 2017 IEEE International Conference on Environment and Electrical Engineering and 2017 IEEE Industrial and Commercial Power Systems Europe (EEEIC / I&CPS Europe) , no. : 1-6.
A wide area monitoring system (WAMS) with reliable telecommunication infrastructure can be expanded and enhanced with additional protection and control functionalities using synchronized phasor data measurements. With that aim, we have developed a multifunctional line protection (MFLP) model with both system and back-up protection functions. Theoretical premises based on transmission and relay protection system knowledge, together with the experience gathered from the operation of existing wide area systems, were used to develop the proposed model. Four main groups of simulation scenarios were defined in order to test the newly implemented functions. The results of the simulation process confirm the assumptions underlying the design of our MFLP module. Simulation results are then used for definition of the protection criteria required for implementation of the wide area protection algorithm in a control center. Conclusions drawn from the protection responses of the proposed algorithm that strengthen the algorithm design process are elaborated in the paper. The main contribution of the paper is the design and development of a centralized MFLP algorithm based on synchronized phasor data that is able to issue a trip command to a circuit breaker before an out-of-step condition occurs.
Igor Ivanković; Igor Kuzle; Ninoslav Holjevac. Wide Area Information-Based Transmission System Centralized Out-of-Step Protection Scheme. Energies 2017, 10, 633 .
AMA StyleIgor Ivanković, Igor Kuzle, Ninoslav Holjevac. Wide Area Information-Based Transmission System Centralized Out-of-Step Protection Scheme. Energies. 2017; 10 (5):633.
Chicago/Turabian StyleIgor Ivanković; Igor Kuzle; Ninoslav Holjevac. 2017. "Wide Area Information-Based Transmission System Centralized Out-of-Step Protection Scheme." Energies 10, no. 5: 633.
Igor Ivankovic; Igor Kuzle; Ninoslav Holjevac. Multifunctional WAMPAC system concept for out-of-step protection based on synchrophasor measurements. International Journal of Electrical Power & Energy Systems 2017, 87, 77 -88.
AMA StyleIgor Ivankovic, Igor Kuzle, Ninoslav Holjevac. Multifunctional WAMPAC system concept for out-of-step protection based on synchrophasor measurements. International Journal of Electrical Power & Energy Systems. 2017; 87 ():77-88.
Chicago/Turabian StyleIgor Ivankovic; Igor Kuzle; Ninoslav Holjevac. 2017. "Multifunctional WAMPAC system concept for out-of-step protection based on synchrophasor measurements." International Journal of Electrical Power & Energy Systems 87, no. : 77-88.
Ivan Pavic; Ninoslav Holjevac; Matija Zidar; Igor Kuzle; Aleksandar Neskovic. Transportation and power system interdependency for urban fast charging and battery swapping stations in Croatia. 2017 40th International Convention on Information and Communication Technology, Electronics and Microelectronics (MIPRO) 2017, 1 .
AMA StyleIvan Pavic, Ninoslav Holjevac, Matija Zidar, Igor Kuzle, Aleksandar Neskovic. Transportation and power system interdependency for urban fast charging and battery swapping stations in Croatia. 2017 40th International Convention on Information and Communication Technology, Electronics and Microelectronics (MIPRO). 2017; ():1.
Chicago/Turabian StyleIvan Pavic; Ninoslav Holjevac; Matija Zidar; Igor Kuzle; Aleksandar Neskovic. 2017. "Transportation and power system interdependency for urban fast charging and battery swapping stations in Croatia." 2017 40th International Convention on Information and Communication Technology, Electronics and Microelectronics (MIPRO) , no. : 1.
Ninoslav Holjevac; Tomislav Capuder; Igor Kuzle. Defining Key Parameters of Economic and Environmentally Efficient Residential Microgrid Operation. Energy Procedia 2017, 105, 999 -1008.
AMA StyleNinoslav Holjevac, Tomislav Capuder, Igor Kuzle. Defining Key Parameters of Economic and Environmentally Efficient Residential Microgrid Operation. Energy Procedia. 2017; 105 ():999-1008.
Chicago/Turabian StyleNinoslav Holjevac; Tomislav Capuder; Igor Kuzle. 2017. "Defining Key Parameters of Economic and Environmentally Efficient Residential Microgrid Operation." Energy Procedia 105, no. : 999-1008.
T. Martinsen; N. Holjevac; B.A. Bremdal; I. Kuzle; J.M. Guerrero; T. Dragicevic; I. Pavić; Q. Shafiee. Improved grid operation through power smoothing control strategies utilizing dedicated energy storage at an electric vehicle charging station. CIRED Workshop 2016 2016, 1 .
AMA StyleT. Martinsen, N. Holjevac, B.A. Bremdal, I. Kuzle, J.M. Guerrero, T. Dragicevic, I. Pavić, Q. Shafiee. Improved grid operation through power smoothing control strategies utilizing dedicated energy storage at an electric vehicle charging station. CIRED Workshop 2016. 2016; ():1.
Chicago/Turabian StyleT. Martinsen; N. Holjevac; B.A. Bremdal; I. Kuzle; J.M. Guerrero; T. Dragicevic; I. Pavić; Q. Shafiee. 2016. "Improved grid operation through power smoothing control strategies utilizing dedicated energy storage at an electric vehicle charging station." CIRED Workshop 2016 , no. : 1.