Smjer struje u prstenu kao i polaritet napona na priključnicama zavojnice pri promjeni magnetskog... more Smjer struje u prstenu kao i polaritet napona na priključnicama zavojnice pri promjeni magnetskog toka određen je Lenzovim pravilom. U članku je objašnjena izrada naprava za pokazivanje Lenzovog pravila koje prikazuju smjer inducirane struje i polaritet induciranog napona primjenom jakog neodimijskog magneta
Člankom je dan pregled tijeka izgradnje i puštanja u rad sunčane elektrane postavljene na krov st... more Člankom je dan pregled tijeka izgradnje i puštanja u rad sunčane elektrane postavljene na krov studenskog restorana u Varaždinu. Opisane su postavljene solarne ćelije, pretvarači, elektro razvod sa komponentama, te odabir smještaja i način montaže. Objašnjeno je povezivanje sustava i puštanje u pogon, uz sve preduvjete koje postavlja distribucijsko područje, u ovom slučaju HEP ODS Varaždin, kao i problematika koja se javlja na terenu tijekom izgradnje.The article reviews the course of construction and commissioning of solar power plant installed on the roof of the student restaurant in Varaždin. Mounted solar panels, inverters, power distribution components and their placement and method of assembly are described. Connecting the system and its start-up are explained, with all the conditions imposed by the distribution area, in this case HEP ODS Varaždin, as well as the problems occurring in the field during construction
The requirements for the quality of protection on metal structures in terms of durability, reliab... more The requirements for the quality of protection on metal structures in terms of durability, reliability and efficiency require from the manufacturer to define certain procedures and verification of anticorrosion protection activities. Today, the criteria used to evaluate the success of the protection and the general quality of the structure are the criteria listed in the EN 1090 standard and in the compatible standards related to the realization and protection of metal structures. The article briefly describes the basis of the requirements of the standard, the eligibility criteria for the protection of structures and it also gives a practical example of the verification process through preparation, implementation and control.
U radu je opisan realizirani inteligentni sustav za pametnu kuću. Koriste se gotovi mikrokontrole... more U radu je opisan realizirani inteligentni sustav za pametnu kuću. Koriste se gotovi mikrokontrolerski moduli koji imaju mogućnost međusobne komunikacije. Uz odgovarajuće dodatne sklopove realizirano je upravljanje grijanjem i svjetlima i objašnjeno kako se sustav može koristiti za nadzor i upravljanje drugim procesima u kući i izvan nje. Realizirano je i upravljanje funkcijama preko daljinskog upravljača pomoću infracrvene veze, te je realiziran prikaz na LCD ekranu. Opisane su hardverske i softverske komponente te funkcionalnost cijelog sustava.This paper describes implementation of smart home intelligent system based on finished microcontroller modules which have the capability to communicate with each other. Heating and lightning controls have been created with suitable extra circuits. It is also explained how the system can be used for surveillance and control of other processes in the house and outside the house. All the functions can be controlled by the remote controller, and...
U članku je opisan način rada postrojenja Aertecnica, predložene izmjene ugradnjom frekvencijskog... more U članku je opisan način rada postrojenja Aertecnica, predložene izmjene ugradnjom frekvencijskog pretvarača, te su opisane njegove karakteristike i prednosti. Na kraju su izračunati godišnji troškovi potrošnje električne energije za EMP bez ugrađenog frekvencijskog pretvarača, izračunati su troškovi ugradnje frekvencijskog pretvarača i ostalih potrebnih elemenata. Izračunat je i rok povrata sredstava kroz uštede na održavanju i štednji električne energije
2017 6th International Conference on Clean Electrical Power (ICCEP)
This paper proposes several probability distribution models for wind- and net-load-power forecast... more This paper proposes several probability distribution models for wind- and net-load-power forecast error, i.e., a generalized normal model (GN) and extended skew-generalized-normal models (ESGN, SGN and SN). They are all compared to different models known from the literature (beta, Weibull and gamma). The evaluation of the discussed probability distribution models shows that the ESGN model presents better fit for probability and cumulative distribution functions.
The System Integrity Protection Scheme (SIPS) is a specialized protection scheme which differs to... more The System Integrity Protection Scheme (SIPS) is a specialized protection scheme which differs to a great extent from the common protection, especially in its main intention. It is designed for integrity protection, failure prevention and mitigation of disturbance consequences in the whole power system (PS) or modern distribution system (MDS) with a significant power of distributed generation (DG). The input parameters for establishing SIPS in PS are synchronized phasor measurements obtained from the Phasor Measurement Units (PMUs), as a globally acknowledged Smart Grid technology. The realization requires that SIPS is added to the existing Wide Area Monitoring, Protection and Control (WAMPAC), based on synchronized measurements. This paper proposes an algorithm that anticipates optimal PMU placement and then uses angular stability protection based on traditional IEDs supported by synchronized measurements. By using such approach, the system avoids possible blackouts due to the comb...
2018 IEEE International Conference on Environment and Electrical Engineering and 2018 IEEE Industrial and Commercial Power Systems Europe (EEEIC / I&CPS Europe), 2018
This paper proposes the optimization procedure for scheduling and allocation of regulating capaci... more This paper proposes the optimization procedure for scheduling and allocation of regulating capacities in systems with a large share of generation from Wind Power Plants (WPPs). The objective function is set to minimize the transmission losses with optional correction according to the economic criteria. Furthermore, it is presented how the geographical dispersion of WPPs and regulating capacities effect transmission losses. The computations were carried out on the standard test network RTS 96 and on the Croatian transmission network for concentrated and more dispersed layout. The testing results indicate reduction of transmission losses in all the discussed cases. However, the reductions were more significant when the layouts of WPPs and regulating capacities were more dispersed geographically. The qualitative analysis of the relevant economic features is introduced at the end.
In this paper Matlab-based application-GUI "Wavdec" is presented, serving as educationa... more In this paper Matlab-based application-GUI "Wavdec" is presented, serving as educational tool for different signal processing courses. Wavdec analyses an image into different wavelet subbands, using three different wavelet decomposition/reconstruction methods: Discrete Wavelet Transform (DWT), Quincunx transform and Steerable Pyramid Wavelet Transform (SPWT). Different levels and wavelet types for each method can be chosen. Also, Gaussian noise with manually defined mean and variance can be added to the original image. Hard thresholding, which either keeps or removes values of coefficients, for each subband can be defined arbitrarily. Thus, Wavdec can be used in different scenarios, for example to demonstrate scalable image compression or noise removal. Finally, Wavdec application automatically calculates image quality between original and reconstructed image using three image quality measures as well as their compression ratio. Finally, the effects of using the described ...
Smjer struje u prstenu kao i polaritet napona na priključnicama zavojnice pri promjeni magnetskog... more Smjer struje u prstenu kao i polaritet napona na priključnicama zavojnice pri promjeni magnetskog toka određen je Lenzovim pravilom. U članku je objašnjena izrada naprava za pokazivanje Lenzovog pravila koje prikazuju smjer inducirane struje i polaritet induciranog napona primjenom jakog neodimijskog magneta
Člankom je dan pregled tijeka izgradnje i puštanja u rad sunčane elektrane postavljene na krov st... more Člankom je dan pregled tijeka izgradnje i puštanja u rad sunčane elektrane postavljene na krov studenskog restorana u Varaždinu. Opisane su postavljene solarne ćelije, pretvarači, elektro razvod sa komponentama, te odabir smještaja i način montaže. Objašnjeno je povezivanje sustava i puštanje u pogon, uz sve preduvjete koje postavlja distribucijsko područje, u ovom slučaju HEP ODS Varaždin, kao i problematika koja se javlja na terenu tijekom izgradnje.The article reviews the course of construction and commissioning of solar power plant installed on the roof of the student restaurant in Varaždin. Mounted solar panels, inverters, power distribution components and their placement and method of assembly are described. Connecting the system and its start-up are explained, with all the conditions imposed by the distribution area, in this case HEP ODS Varaždin, as well as the problems occurring in the field during construction
The requirements for the quality of protection on metal structures in terms of durability, reliab... more The requirements for the quality of protection on metal structures in terms of durability, reliability and efficiency require from the manufacturer to define certain procedures and verification of anticorrosion protection activities. Today, the criteria used to evaluate the success of the protection and the general quality of the structure are the criteria listed in the EN 1090 standard and in the compatible standards related to the realization and protection of metal structures. The article briefly describes the basis of the requirements of the standard, the eligibility criteria for the protection of structures and it also gives a practical example of the verification process through preparation, implementation and control.
U radu je opisan realizirani inteligentni sustav za pametnu kuću. Koriste se gotovi mikrokontrole... more U radu je opisan realizirani inteligentni sustav za pametnu kuću. Koriste se gotovi mikrokontrolerski moduli koji imaju mogućnost međusobne komunikacije. Uz odgovarajuće dodatne sklopove realizirano je upravljanje grijanjem i svjetlima i objašnjeno kako se sustav može koristiti za nadzor i upravljanje drugim procesima u kući i izvan nje. Realizirano je i upravljanje funkcijama preko daljinskog upravljača pomoću infracrvene veze, te je realiziran prikaz na LCD ekranu. Opisane su hardverske i softverske komponente te funkcionalnost cijelog sustava.This paper describes implementation of smart home intelligent system based on finished microcontroller modules which have the capability to communicate with each other. Heating and lightning controls have been created with suitable extra circuits. It is also explained how the system can be used for surveillance and control of other processes in the house and outside the house. All the functions can be controlled by the remote controller, and...
U članku je opisan način rada postrojenja Aertecnica, predložene izmjene ugradnjom frekvencijskog... more U članku je opisan način rada postrojenja Aertecnica, predložene izmjene ugradnjom frekvencijskog pretvarača, te su opisane njegove karakteristike i prednosti. Na kraju su izračunati godišnji troškovi potrošnje električne energije za EMP bez ugrađenog frekvencijskog pretvarača, izračunati su troškovi ugradnje frekvencijskog pretvarača i ostalih potrebnih elemenata. Izračunat je i rok povrata sredstava kroz uštede na održavanju i štednji električne energije
2017 6th International Conference on Clean Electrical Power (ICCEP)
This paper proposes several probability distribution models for wind- and net-load-power forecast... more This paper proposes several probability distribution models for wind- and net-load-power forecast error, i.e., a generalized normal model (GN) and extended skew-generalized-normal models (ESGN, SGN and SN). They are all compared to different models known from the literature (beta, Weibull and gamma). The evaluation of the discussed probability distribution models shows that the ESGN model presents better fit for probability and cumulative distribution functions.
The System Integrity Protection Scheme (SIPS) is a specialized protection scheme which differs to... more The System Integrity Protection Scheme (SIPS) is a specialized protection scheme which differs to a great extent from the common protection, especially in its main intention. It is designed for integrity protection, failure prevention and mitigation of disturbance consequences in the whole power system (PS) or modern distribution system (MDS) with a significant power of distributed generation (DG). The input parameters for establishing SIPS in PS are synchronized phasor measurements obtained from the Phasor Measurement Units (PMUs), as a globally acknowledged Smart Grid technology. The realization requires that SIPS is added to the existing Wide Area Monitoring, Protection and Control (WAMPAC), based on synchronized measurements. This paper proposes an algorithm that anticipates optimal PMU placement and then uses angular stability protection based on traditional IEDs supported by synchronized measurements. By using such approach, the system avoids possible blackouts due to the comb...
2018 IEEE International Conference on Environment and Electrical Engineering and 2018 IEEE Industrial and Commercial Power Systems Europe (EEEIC / I&CPS Europe), 2018
This paper proposes the optimization procedure for scheduling and allocation of regulating capaci... more This paper proposes the optimization procedure for scheduling and allocation of regulating capacities in systems with a large share of generation from Wind Power Plants (WPPs). The objective function is set to minimize the transmission losses with optional correction according to the economic criteria. Furthermore, it is presented how the geographical dispersion of WPPs and regulating capacities effect transmission losses. The computations were carried out on the standard test network RTS 96 and on the Croatian transmission network for concentrated and more dispersed layout. The testing results indicate reduction of transmission losses in all the discussed cases. However, the reductions were more significant when the layouts of WPPs and regulating capacities were more dispersed geographically. The qualitative analysis of the relevant economic features is introduced at the end.
In this paper Matlab-based application-GUI "Wavdec" is presented, serving as educationa... more In this paper Matlab-based application-GUI "Wavdec" is presented, serving as educational tool for different signal processing courses. Wavdec analyses an image into different wavelet subbands, using three different wavelet decomposition/reconstruction methods: Discrete Wavelet Transform (DWT), Quincunx transform and Steerable Pyramid Wavelet Transform (SPWT). Different levels and wavelet types for each method can be chosen. Also, Gaussian noise with manually defined mean and variance can be added to the original image. Hard thresholding, which either keeps or removes values of coefficients, for each subband can be defined arbitrarily. Thus, Wavdec can be used in different scenarios, for example to demonstrate scalable image compression or noise removal. Finally, Wavdec application automatically calculates image quality between original and reconstructed image using three image quality measures as well as their compression ratio. Finally, the effects of using the described ...
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