| 1. |
- Busatto, Tatiano, et al.
(författare)
-
Estimation of the Consumer Electronics Capacitance for Harmonic Resonance Studies by a Non-Invasive Measurement Method
- 2018
-
Ingår i: Proceedings of International Conference on Harmonics and Quality of Power, ICHQP. - Piscataway, NJ : Institute of Electrical and Electronics Engineers (IEEE). - 9781538605172
-
Konferensbidrag (refereegranskat)abstract
- Harmonic resonances in distribution systems are mainly between network inductances and shunt capacitances from capacitor banks and consumer loads. In this paper, particular attention is devoted to the evaluation of capacitances from domestic equipment, serving as a reference for resonance frequency studies. The assessment is performed by simulation and measurements of common low power electronic loads. From the analysis of EMI filters topologies used in AC/DC converters, a non-invasive capacitance measurement estimation method is presented. The method is verified after correlating capacitances with the resonance frequencies obtained from a frequency sweep method. From experimental measurements, the results show that the equivalent shunt capacitances for a set of 24 LED lamps are between 10 and 135 nF.
|
|
| 2. |
- Busatto, Tatiano, et al.
(författare)
-
Experimental Harmonic Analysis of the Impact of LED Lamps on PV Inverters Performance
- 2019
-
Ingår i: 2019 Electric Power Quality and Supply Reliability Conference (PQ) & 2019 Symposium on Electrical Engineering and Mechatronics (SEEM). - : IEEE.
-
Konferensbidrag (refereegranskat)abstract
- It is known for instance that voltage waveform distortion and network impedance have a significant impact on PV inverter current emissions. Because this, much research is still required to better understand their behavior and impact when multiple common household devices are placed to operate together in the same low-voltage installation. In particular, this paper addresses the harmonic impact of LED lamps on PV inverters performance considering different technologies and number of lamps. The analysis has been carried out with different scenarios considering two types of LED lamps, with and without power factor correction feature, and three different PV inverter technologies. The evaluation of the impacts is simply performed by frequency and time domain analysis, establishing the correlation between the devices current harmonics. The results obtained from the experiments have shown that LED lamps are prone to add a significant impact on the PV inverter current harmonics, and this impact is mainly dependent on the devices used technology.
|
|
| 3. |
- Busatto, Tatiano, et al.
(författare)
-
Including Uncertainties from Customer Connections in Calculating Low-Voltage Harmonic Impedance
- 2019
-
Ingår i: IEEE Transactions on Power Delivery. - : IEEE. - 0885-8977 .- 1937-4208. ; 34:2, s. 606-615
-
Tidskriftsartikel (refereegranskat)abstract
- A method is proposed in this paper to determine the harmonic impedances in low-voltage networks in a stochastic way. The consequences of resonances for harmonic propagation and stability of power converters are summarized. By using Monte Carlo simulation, the method includes the uncertainties in customer impedances, specifically due to electronic loads and local generation. The uncertainty in customer impedance is included by considering probability distribution for the resistive, inductive and capacitive parts of the impedance. The concept of transfer impedance is used for phase-to-neutral connections. A method is developed and applied to two existing low-voltage networks in Sweden. Results show that, for these two networks, the resonant frequencies decrease around 28 % once PV panels are installed. The paper includes a discussion of some of the practical aspects of applying the proposed method.
|
|
| 4. |
- Busatto, Tatiano, et al.
(författare)
-
Interaction between Grid-Connected PV systems and LED Lamps : Directions for Further Research on Harmonics and Supraharmonics
- 2016
-
Ingår i: 2016 17th International Conference on Harmonics and Quality of Power. - Piscataway, NJ. - 9781509037926 ; , s. 193-197
-
Konferensbidrag (refereegranskat)abstract
- This paper discusses different approaches to investigate the interaction through harmonics, interharmonics, supraharmonics, and light flicker, between photovoltaic (PV) inverters and LED lamps in low-voltage installations. Single grid-connected power generators and electronic loads like LED lamps can be easily characterized in terms of harmonics in a given range of frequency. This subject is relatively well understood, and specific standards for measuring and restricting emissions are already established to ensure a low probability of interference. However, when connected together, source and load exhibit behavior that requires further study and understanding. This work presents a discussion serving as a guide for future work on analysis of losses and other impacts of the disturbances regarding this specific load and source interaction. The following are taken into account: the nonlinearity of LED loads and PV converters; the technologies and methods used in control; and the changes in power flow caused by load and power production variations
|
|
| 5. |
|
|
| 6. |
- Busatto, Tatiano, et al.
(författare)
-
Supraharmonics Emission Assessment of Multi-level Converters Applied for Photovoltaic Grid-Connected Inverters
- 2017
-
Ingår i: The Renewable Energies and Power Quality Journal. - Spain : EA4EPQ-European Association for the Development of Renewable Energy, Environment and Power Quality. - 2172-038X. ; 1:15, s. 143-148
-
Tidskriftsartikel (refereegranskat)abstract
- Topologies for different DC-AC converters used on grid-connected photovoltaic (PV) inverters are analysed and compared within this paper. The main focus is to evaluate the supraharmonic emission in the frequency range 2 to 150 kHz. For this study three topologies are evaluated: Neutral Point Clamped (NPC), the Cascaded H-bridge (CHB) and the Flying Capacitor (FC). To approximate the operation closer to a real scenario, the converters are analysed under the presence of voltage waveform distortion in the power supply. The simulation is performed using PSpice for the converters and Simulink for the grid. The characterization is made by the quantification of harmonics and supraharmonics, and also by the frequency domain analysis of the output current. Finally, a comparison of the chosen technologies is carried out, given a better understanding on the elements which exert influence on this type of emission.
|
|
| 7. |
- Gil-de-Castro, Aurora, et al.
(författare)
-
LED lamps under different EMC environnments
- 2015
-
Konferensbidrag (refereegranskat)abstract
- More and more loads are currently connected at the same connection point in industrial, commercial and residential sectors. This paper studies the interaction between a certain LED lamp connected to different industrial environments, and how different LED lamps behave in the same industrial environment. Harmonic emission as well as supraharmonic emission have been considered in the study.
|
|
| 8. |
|
|
| 9. |
- Schwanz, Daphne, et al.
(författare)
-
A Review of Solutions for Harmonic Mitigation
- 2016
-
Ingår i: 2016 17th International Conference on Harmonics and Quality of Power. - Piscataway, NJ : IEEE Computer Society. - 9781509037926 ; , s. 30-35
-
Konferensbidrag (refereegranskat)abstract
- With the increasing of non-linear equipments connected in the network, mitigation solutions are needed to avoid and solve harmonic and resonance problems that may damage equipments and avoid their connection into the grid. Several are the solutions given to this problem; however, not all them are suitable for all situations. For it, in this paper a review of the most used harmonic solutions and some new technologies are presented. The advantages and disadvantages are described and the most used passive, active and hybrid solutions are described
|
|
| 10. |
- Schwanz, Daphne, et al.
(författare)
-
A stochastic study of harmonic voltage distortion considering single-phase photovoltaic inverters
- 2018
-
Ingår i: Proceedings of International Conference on Harmonics and Quality of Power, ICHQP. - Piscataway, NJ : Institute of Electrical and Electronics Engineers (IEEE). - 9781538605172
-
Konferensbidrag (refereegranskat)abstract
- In this paper, the hosting capacity considering harmonic distortion is estimated for single-phase-connected photovoltaic inverters (PVIs) in low-voltage distribution networks. A stochastic approach is used to calculate the harmonic voltage distortion with each customer in the network. The method has been applied to a 6-customer network for the connection of 2.5-kW single-phase PVIs with and without harmonic voltage background. From the results, it was observed that the contribution from 2.5 kW single-phase photovoltaic inverters to the individual harmonic distortion will not cause the established limits to be exceeded. Also, that the harmonic voltage background is often dominating and should be continuously observed.
|
|
