| 1. |
- Chamorro Vera, Harold R, et al.
(författare)
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Coherent groups identification under high penetration of non-synchronous generation
- 2016
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Ingår i: IEEE Power and Energy Society General Meeting. - : IEEE. - 9781509041688
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Konferensbidrag (refereegranskat)abstract
- The current power systems are facing an important transition due to the integration of non-synchronous generation through back-to-back Full Rated Converters' (FRC). Coherency behaviour under the presence of large inclusion of renewables requires special attention in order to understand the swing oscillations when the inertia is decreasing due to the decoupling. This paper presents the application of the so-called Koopman operator for the identification of coherent groups in power systems with the influence of non-synchronous generation. The method provides a clustering observation tool based on measurement signals allowing to identify the dynamic changes effected through the derived spectral analysis of the Koopman modes. The applied method of coherency identification is evaluated in the Nordic test system through gradually increasing integration and different fault locations.
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| 2. |
- Chamorro Vera, Harold R., et al.
(författare)
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On the Optimization of Damping Enhancement in a Power System with a Hybrid HVDC Link
- 2019
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Ingår i: Proceedings of 2019 IEEE PES Innovative Smart Grid Technologies Europe, ISGT-Europe 2019. - : Institute of Electrical and Electronics Engineers (IEEE).
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Konferensbidrag (refereegranskat)abstract
- Hybrid HVDC links incorporate both Line Commutated Converters (LCC) and Voltage Source Converters (VSC) systems, thereby gathering the benefits of both technologies. Supplementary Power Oscillation Damping (POD) controllers can be added to both LCCs and VSCs to help enhance the power system stability against disturbances, such as short circuits. However POD controller tuning can be a delicate process, due to the highly non-linear and complex nature of the involved power system, which might induce adverse interactions leading to a reduced damping. This paper proposes the application of the Simulated Annealing Algorithm (SAA) for tuning the POD controllers parameters, with the purpose of optimizing the performance of POD controllers in the power system. The damping performance is evaluated in case of multiple disturbances in a test power system. The results show the ability of the proposed technique to enhance the performance of the POD controllers under various operating conditions.
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| 3. |
- Rodriguez, Juan R., et al.
(författare)
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A single-loop and current-sensorless control for on-grid seven-level photovoltaic microinverter
- 2022
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Ingår i: IET Power Electronics. - : Institution of Engineering and Technology (IET). - 1755-4535 .- 1755-4543. ; n/a:n/a
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Tidskriftsartikel (refereegranskat)abstract
- Abstract This paper proposes a single-phase transformerless photovoltaic (PV) microinverter for low and medium-voltage applications. The proposed approach comprises a suitable combination of multilevel boost/buck and H-bridge topologies with a current-sensorless control scheme, where the system controller only needs a straightforward-to-implement control loop to reach the desired attributes in solar PV conversion systems. Compared with other microinverters, this proposal significantly reduces the number of hardware components and required software resources, considerably attaining industrial and production advantages; guaranteeing: (i) a high DC elevation factor; (ii) an extraction of maximum power from solar PV panels; (iii) a multilevel output voltage; (iv) a low total harmonic distortion; and (v) a power factor close to unity. The multilevel microinverter’s feasibility and effectiveness are assessed by a comprehensive mathematical model, whose simulation results are evaluated using MATLAB-Simulink, and the experimental results are validated by means of an on-grid low-scale prototype, generating a power capacity of 1.5Â kW.
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| 4. |
- Bayona, Jhon F., et al.
(författare)
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A High Efficiency Fluorescent Lamp Electronic Ballast Design
- 2016
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Ingår i: IEEE CACIDI 2016 - IEEE Conference on Computer Sciences. - : Institute of Electrical and Electronics Engineers (IEEE). - 9781509029389
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Konferensbidrag (refereegranskat)abstract
- This paper presents the design and implementation of an electronic ballast for powering a fluorescent lamp. The purpose of this work is to improve the efficiency of the ballast by implementing a Series Resonant Inverter (SRI) in half-bridge configuration instead classic Series-Parallel Resonant (SPRI); in order to allow to provide the voltage steady state of the lamp. By other hand, this DC-AC converter will supply the voltage lamp ignition. Results on the proposed experimental prototype, using a fluorescent lamp of 32W, shows a better efficiency compared to traditional SPRI configurations.
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| 5. |
- Bertozzi, Otavio, et al.
(författare)
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Observer-based Power System Stabilizer for Multi-terminal DC Networks
- 2023
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Ingår i: 2023 International Conference on Smart Energy Systems and Technologies (SEST). - : Institute of Electrical and Electronics Engineers (IEEE). ; , s. 1-6
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Konferensbidrag (refereegranskat)abstract
- Multi-terminal DC (MTDC) networks interconnect isolated systems, asynchronous areas, and renewable energy resources. However, ensuring stability and proper dynamic behavior of MTDC networks can be challenging. Power electronic converters offer increased control capabilities to achieve predictable and stable dynamics in the face of disturbances, faults, and sustained oscillations. The DC-side power system stabilizer (DC-PSS) is a supplementary controller that relies on optimal placement for maximized effectiveness. Observers can estimate the state of relevant system variables for the feedback controller without system-wide communication. This paper proposes an optimally-placed observer-based augmented DC-PSS for enhanced voltage stability in MTDC networks. The design procedure assumes no knowledge of the structure and parameters of the inner controllers of the terminal converters. We present a mathematical model and discuss the observer and control design procedures, and simulation results show the benefits and potential drawbacks of the proposed approach. Our observer-based DC-PSS relies on system-wide DC-bus voltage estimates from a single measurement, making it less vulnerable to communication delays and cyberattacks. Our work contributes to the field of supplementary controllers in MTDC networks and provides insights into future research directions toward stable and reliable DC power systems.
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| 6. |
- Cajas, Patricio, et al.
(författare)
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AC Multi-Stage Transmission Network Expansion Planning considering a Multi-Voltage Approach
- 2022
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Ingår i: 2022 IEEE PES Innovative Smart Grid Technologies Conference Europe (ISGT-Europe). - : Institute of Electrical and Electronics Engineers (IEEE). ; , s. 1-5
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Konferensbidrag (refereegranskat)abstract
- Long-term transmission network expansion planning aims to determine where, when and which types of equipment should be installed over a period of time, in order to meet the electric market needs with certain specifications of quality in services at the lowest possible cost. Until now, several methods have been proposed to solve the Static Transmission Network Expansion Planning (STNEP) problem, considering a multi-voltage approach using the DC load flow, however, these solutions may not be feasible when the AC model is used for the operational problem. In this paper a multi-stage model based on the mathematical formulation of the AC load flow is solved, considering a multi-voltage approach, power losses and reactive power compensation. The AC multi-stage transmission network expansion planing problem with multi-voltage approach (MTNEP-MV) was solved by the hybrid meta-heuristic, Differential Evolution (DE) and Continuous Population-Based Incremental Learning (PBILc) algorithm. To evaluate the proposed mathematical formulation Garver 6-bus system was used. The results show that raising the transmission system voltage and considering the MTNEP-MV problem, less transmission lines are required, and also power losses and reactive power compensation needs, are reduced.
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| 7. |
- Cantillo-Luna, Sergio, et al.
(författare)
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Locational Marginal Price Forecasting Using SVR-Based Multi-Output Regression in Electricity Markets
- 2022
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Ingår i: Energies. - : MDPI AG. - 1996-1073. ; 15:1
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Tidskriftsartikel (refereegranskat)abstract
- Electricity markets provide valuable data for regulators, operators, and investors. The use of machine learning methods for electricity market data could provide new insights about the market, and this information could be used for decision-making. This paper proposes a tool based on multi-output regression method using support vector machines (SVR) for LMP forecasting. The input corresponds to the active power load of each bus, in this case obtained through Monte Carlo simulations, in order to forecast LMPs. The LMPs provide market signals for investors and regulators. The results showed the high performance of the proposed model, since the average prediction error for fitting and testing datasets of the proposed method on the dataset was less than 1%. This provides insights into the application of machine learning method for electricity markets given the context of uncertainty and volatility for either real-time and ahead markets.
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| 8. |
- Chamorro, Harold R., et al.
(författare)
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Consensus Control for Induction Motors Speed Regulation
- 2014
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Ingår i: 2014 16TH European Conference on Power Electronics and Applications.
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Konferensbidrag (refereegranskat)abstract
- Cyber Physical Energy Systems (CPES) development requires the combination of distributed intelligence to fulfill the future complex tasks and reach the increase the energy demands. Electrical Industrial Systems (EIS) are in continuous evolving integrating new technologies allowing to a better performance and increase the efficiency. This paper applies the consensus protocol for Multi-Agent Systems (MAS) to control the speed of multiple induction motors. In this paper, the behaviour of the system under different disturbances and scenarios has been simulated, thus, confirming the suitability and simplicity of this method for coordinating the control actions.
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| 9. |
- Chamorro, Harold R., et al.
(författare)
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Distributed Synthetic Inertia Control in Power Systems
- 2018
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Ingår i: Proceedings of 8th International Conference on Energy and Environment. - : Institute of Electrical and Electronics Engineers (IEEE). - 9781538639436 ; , s. 74-78
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Konferensbidrag (refereegranskat)abstract
- Due to the increasing use of renewables into the grid connected through power converters, the rotational inertia in power systems has been reducing. Consequently the frequency response requires the activation of the so-called synthetic inertia control. The synthetic inertia control aims to inject an extra power component when the system experiences a frequency disturbance event. In this paper, it is proposed that a distributed dynamic controllers for sharing the synthetic inertia control actions between the various active power converters in the grid for the improvement of the frequency response. It is assumed that a communication structure between the synthetic inertia controllers and the local power converters is involved in the system. The convergence of the control system is reached through a game population theory and the primary frequency control has been improved. The results are validated based on simulation of a two-area test system.
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| 10. |
- Chamorro, Harold R., et al.
(författare)
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Evaluation of the synthetic inertia control using active damping method
- 2017
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Ingår i: 2017 6th International Conference on Clean Electrical Power. - : Institute of Electrical and Electronics Engineers (IEEE). - 9781509046829 ; , s. 269-274
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Konferensbidrag (refereegranskat)abstract
- The current and massive deployment of non-synchronous generation is degrading the inertial response in power systems. The addition of an extra control loop, the so-called synthetic inertia, can contribute in the improvement of the frequency response, through an additional power injection. In this paper, the active damping method is used to enhance both, the closed-loop current control and the synthetic inertia control loop. A full aggregated model of a wind turbine generator (WTG) is integrated in a test system. The results obtained show an increase in the power injected into the grid, thereby improving the frequency response after a frequency disturbance. Moreover, the response of the closed current-control loop and voltage loop are presented, in order to show their interaction with the synthetic inertia control.
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