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Prof. Dr. Carlos Platero
Universidad Politécnica de Madrid - Escuela Técnica Superior de Ingenieros Industriales

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Research Keywords & Expertise

0 Electrical Machines
0 Generators
0 Power Generation
0 Electrical Machines And Drive, Simulation And Modeling Electric Drive, Control Electrical Machine, Monitoring Electrical Drive, Industria 4.0
0 excitation system

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Generators
Electrical Machines
excitation system

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Journal article
Published: 16 June 2021 in IEEE Access
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The probability of faulty synchronization of a generator is very small, but not impossible. The main cause of a faulty synchronization is due to wiring errors caused during maintenance or commissioning when voltage transformer and synchronizing equipment are connected or reconnected wrongly. Faulty synchronizations of synchronous generators cause overcurrent and high electromagnetic torque values that can severely damage, not only the generators their selves, but also prime movers and step-up transformers. Moreover, they produce disturbances on the power system such as power oscillations and voltage sags that can end up collapsing the system if it is not cleared quickly. Despite that, conventional synchronous generator protection systems have not a specific function against faulty synchronizations. This paper presents and analyzes a new and specific protection method against faulty synchronizations. The method is based on an instantaneous low setting overcurrent protection that is only activated during synchronizations. Once the synchronization ends, the protection gets disabled in order to allow the increase of the generator power output. Consequently, it minimizes the damages and the disturbance in the power system through rapid detection and tripping. The method has been successfully validated by computer simulations for a thermal power plant 362 MVA turbo-generator, and by experimental tests on a 5 kVA laboratory generation unit.

ACS Style

Pengfei Tian; José Manuel Guerrero; Kumar Mahtani; Carlos A. Platero. Instantaneous Specific Protection Method against Faulty Synchronizations of Synchronous Machines. IEEE Access 2021, 9, 1 -1.

AMA Style

Pengfei Tian, José Manuel Guerrero, Kumar Mahtani, Carlos A. Platero. Instantaneous Specific Protection Method against Faulty Synchronizations of Synchronous Machines. IEEE Access. 2021; 9 ():1-1.

Chicago/Turabian Style

Pengfei Tian; José Manuel Guerrero; Kumar Mahtani; Carlos A. Platero. 2021. "Instantaneous Specific Protection Method against Faulty Synchronizations of Synchronous Machines." IEEE Access 9, no. : 1-1.

Journal article
Published: 04 March 2021 in IEEE Transactions on Industry Applications
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The use of variable speed drives made essential the presence of power electronic in electrical systems. The AC to DC and DC to AC conversions thanks to rectifiers and inverters cause difficulties in the ground fault detection. In this paper, a new method to detect ground faults in variable speed drives is presented. It is based on the analysis of the terminal voltage signal of a grounding resistor connected between the neutral at the secondary of the main power transformer and ground. Attending to the waveform, the ground fault can be detected on the AC grid side, DC positive or negative terminals or on the AC inverter side. To verify the method, numerous simulations and experimental tests in a 140 kW power converter were carried out achieving satisfactory results.

ACS Style

Jose Manuel Guerrero; Gustavo Navarro; Kumar Mahtani; Carlos Antonio Platero. Ground Fault Detection Method for Variable Speed Drives. IEEE Transactions on Industry Applications 2021, 57, 2547 -2558.

AMA Style

Jose Manuel Guerrero, Gustavo Navarro, Kumar Mahtani, Carlos Antonio Platero. Ground Fault Detection Method for Variable Speed Drives. IEEE Transactions on Industry Applications. 2021; 57 (3):2547-2558.

Chicago/Turabian Style

Jose Manuel Guerrero; Gustavo Navarro; Kumar Mahtani; Carlos Antonio Platero. 2021. "Ground Fault Detection Method for Variable Speed Drives." IEEE Transactions on Industry Applications 57, no. 3: 2547-2558.

Journal article
Published: 05 January 2021 in IEEE Access
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Condition monitoring of large power transformers is of paramount importance in power systems. One of the most common indicators of transformer aging is moisture content in oil. In this article, a capacitive sensor able to online measuring moisture content is presented. The output of this sensor is recorded using a Frequency Response Analysis (FRA) device. Comparing the FRA results of a degraded oil with a reference FRA test, moisture content can be determined. A prototype sensor has been designed, built and tested. The performance of this sensor was simulated and laboratory tested with different moisture content oil samples. The results confirm that the proposed sensor can determine moisture content in oil. Therefore, it allows estimating oil degradation.

ACS Style

Jose M. Guerrero; Alejandro E. Castilla; Jose A. Sanchez Fernandez; Carlos A. Platero. Transformer Oil Diagnosis Based on a Capacitive Sensor Frequency Response Analysis. IEEE Access 2021, 9, 7576 -7585.

AMA Style

Jose M. Guerrero, Alejandro E. Castilla, Jose A. Sanchez Fernandez, Carlos A. Platero. Transformer Oil Diagnosis Based on a Capacitive Sensor Frequency Response Analysis. IEEE Access. 2021; 9 ():7576-7585.

Chicago/Turabian Style

Jose M. Guerrero; Alejandro E. Castilla; Jose A. Sanchez Fernandez; Carlos A. Platero. 2021. "Transformer Oil Diagnosis Based on a Capacitive Sensor Frequency Response Analysis." IEEE Access 9, no. : 7576-7585.

Journal article
Published: 18 December 2020 in IEEE Industrial Electronics Magazine
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The limitations of the thermal, vibration, or electrical monitoring of electric machines such as false indications, low sensitivity, and difficulty of fault interpretation have recently been exposed. This has led to a shift in the direction in research toward applying new techniques for improving the reliability of condition monitoring. With the changing environment, the purpose of this article is to provide an overview of the recent trends in the industrial demand and research activity in condition monitoring technology. The new developments in insulation testing, electrical testing, flux analysis, transient analysis, and fault prognostics are summarized. The challenges and recommendations for future work for the new technologies are also explored to help support target research and development efforts according to industrial needs.

ACS Style

Sang Bin Lee; Greg C. Stone; Jose Antonino-Daviu; Konstantinos N. Gyftakis; Elias G. Strangas; Pascal Maussion; Carlos A. Platero. Condition Monitoring of Industrial Electric Machines: State of the Art and Future Challenges. IEEE Industrial Electronics Magazine 2020, 14, 158 -167.

AMA Style

Sang Bin Lee, Greg C. Stone, Jose Antonino-Daviu, Konstantinos N. Gyftakis, Elias G. Strangas, Pascal Maussion, Carlos A. Platero. Condition Monitoring of Industrial Electric Machines: State of the Art and Future Challenges. IEEE Industrial Electronics Magazine. 2020; 14 (4):158-167.

Chicago/Turabian Style

Sang Bin Lee; Greg C. Stone; Jose Antonino-Daviu; Konstantinos N. Gyftakis; Elias G. Strangas; Pascal Maussion; Carlos A. Platero. 2020. "Condition Monitoring of Industrial Electric Machines: State of the Art and Future Challenges." IEEE Industrial Electronics Magazine 14, no. 4: 158-167.

Journal article
Published: 28 November 2020 in Sensors
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There are several techniques for current measurement. Most of them are capable of measuring both alternating and direct current (AC/DC) components. However, they have severe drawbacks for rotating applications (large size, sensitivity to external fields, and low signal amplitude). In addition to these weaknesses, measured signals should be transmitted to a stationary part. In order to contribute solving these difficulties, this paper presents a sensor that can measure AC/DC simultaneously based on the electromagnetic coupling of two coils. To this aim, the measured waveform is analysed. In this paper, the design of such a sensor is presented. This design is validated through computer simulations and a prototype is built. The performance of this sensor prototype is analysed through experimental tests.

ACS Style

Miguel Angel Pardo-Vicente; Carlos A. Platero; José Ángel Sánchez-Fernández; Francisco Blázquez. AC/DC Current Sensor for Rotating Applications. Sensors 2020, 20, 6811 .

AMA Style

Miguel Angel Pardo-Vicente, Carlos A. Platero, José Ángel Sánchez-Fernández, Francisco Blázquez. AC/DC Current Sensor for Rotating Applications. Sensors. 2020; 20 (23):6811.

Chicago/Turabian Style

Miguel Angel Pardo-Vicente; Carlos A. Platero; José Ángel Sánchez-Fernández; Francisco Blázquez. 2020. "AC/DC Current Sensor for Rotating Applications." Sensors 20, no. 23: 6811.

Journal article
Published: 26 July 2020 in Sensors
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Electrical industry uses oils for cooling and insulation of several machines, such as power transformers. In addition, it uses water for cooling some synchronous generators. To avoid malfunctions in these assets, fluid quality should be preserved. To contribute to this aim, a sensor that detects changes in fluid composition is presented. The designed sensor is like a single-phase transformer whose magnetic core is the fluid whose properties will be measured. The response of this device to a frequency sweep is recorded. Through a comparison between any measurement and a reference one corresponding to a healthy state, pollutants presence, such as water in oil or salt in water, can be measured. The performance of the sensor was analyzed through simulation. In addition, a prototype was built and tested measuring water concentration in oil and salt content in water. The correlation between pollutant concentration measured with the sensor and known pollutant concentrations is good.

ACS Style

Jose M. Guerrero; Alejandro E. Castilla; José Ángel Sánchez-Fernández; Carlos A. Platero. Fluid Degradation Measurement Based on a Dual Coil Frequency Response Analysis. Sensors 2020, 20, 4155 .

AMA Style

Jose M. Guerrero, Alejandro E. Castilla, José Ángel Sánchez-Fernández, Carlos A. Platero. Fluid Degradation Measurement Based on a Dual Coil Frequency Response Analysis. Sensors. 2020; 20 (15):4155.

Chicago/Turabian Style

Jose M. Guerrero; Alejandro E. Castilla; José Ángel Sánchez-Fernández; Carlos A. Platero. 2020. "Fluid Degradation Measurement Based on a Dual Coil Frequency Response Analysis." Sensors 20, no. 15: 4155.

Journal article
Published: 09 June 2020 in IEEE Transactions on Industry Applications
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The growing adoption of electric vehicles has recently attracted increasing attention of scientists and brought about pioneering research studies from various fields. Safety concerns particularly those regarding ground faults detection and protection, have extensively been addressed. Ground faults occur quite frequently in electric vehicles and they may be due to severe operation conditions, such as vibrations, twists or even crashes. Generally, the first ground fault is not dangerous, since the powertrain systems, namely, the DC bus where the batteries are connected, the power inverter and one or more AC machines, are generally ungrounded. The second ground fault, however, can produce malfunction in some systems, power loss or even serious damages. Locating the fault has often proved hard and time-consuming. For this reason, the present study focuses on developing a ground-fault detection method for electric vehicles capable of determining on which side, the DC or the AC, the ground fault is located. The method is based on the analysis of the voltage in a grounding resistor connected between the midpoint of the battery pack and ground. Based on the polarity and harmonics, it is possible to locate the ground fault. This method has been verified excellent results have been achieved using computer simulations and experimental tests in a 140-kW electronic power inverter fed by a 480 Vdc battery.

ACS Style

Jose Manuel Guerrero; Gustavo Navarro; Carlos Antonio Platero; Pengfei Tian; Francisco Blazquez. A Novel Ground Fault Detection Method for Electric Vehicle Powertrains Based on a Grounding Resistor Voltage Analysis. IEEE Transactions on Industry Applications 2020, 56, 4934 -4944.

AMA Style

Jose Manuel Guerrero, Gustavo Navarro, Carlos Antonio Platero, Pengfei Tian, Francisco Blazquez. A Novel Ground Fault Detection Method for Electric Vehicle Powertrains Based on a Grounding Resistor Voltage Analysis. IEEE Transactions on Industry Applications. 2020; 56 (5):4934-4944.

Chicago/Turabian Style

Jose Manuel Guerrero; Gustavo Navarro; Carlos Antonio Platero; Pengfei Tian; Francisco Blazquez. 2020. "A Novel Ground Fault Detection Method for Electric Vehicle Powertrains Based on a Grounding Resistor Voltage Analysis." IEEE Transactions on Industry Applications 56, no. 5: 4934-4944.

Journal article
Published: 26 May 2020 in Sensors
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Nowadays, non-toroidal shape primary pass-through current transformers are commonly used for large current machines with several cables per phase. As these transformers exhibit no radial symmetry, it is not clear if they can be tested using the indirect test described in the IEC 61869 standard. In order to answer this question, two non-toroidal shaped current transformers of different secondary winding designs have been tested and simulated. One transformer has a uniformly distributed secondary winding and the other has a partially distributed secondary winding. Both transformers have the same nameplate characteristics. Both perform correctly in the indirect test. However, only the transformer with the uniformly distributed secondary winding performs correctly in a direct test. A finite element simulation shows that the iron core of the partially distributed secondary winding transformer was saturated, while the iron core of the uniformly distributed one was not. This result explains their different performance. The main conclusion is that the indirect test is not sensitive enough to cover all cases and therefore under doubtful situations, the transformers should be tested using the direct test.

ACS Style

Carlos A. Platero; José Ángel Sánchez-Fernández; Konstantinos N. Gyftakis; Francisco Blázquez; Ricardo Granizo. Performance Problems of Non-Toroidal Shaped Current Transformers. Sensors 2020, 20, 3025 .

AMA Style

Carlos A. Platero, José Ángel Sánchez-Fernández, Konstantinos N. Gyftakis, Francisco Blázquez, Ricardo Granizo. Performance Problems of Non-Toroidal Shaped Current Transformers. Sensors. 2020; 20 (11):3025.

Chicago/Turabian Style

Carlos A. Platero; José Ángel Sánchez-Fernández; Konstantinos N. Gyftakis; Francisco Blázquez; Ricardo Granizo. 2020. "Performance Problems of Non-Toroidal Shaped Current Transformers." Sensors 20, no. 11: 3025.

Research article
Published: 03 February 2020 in IET Electric Power Applications
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This study presents a new protection scheme for turn-to-turn fault protection in the stator windings of synchronous machines. The main difference with other methods is the calculation of voltage of the winding from the phase to ground and neutral to ground voltages, which can be obtained from the monitoring provided by any commercial generator multifunction protection relay. This new method allows the employment of the protection transformers already installed in the protection scheme, simplifying and reducing the cost of the protection function. To validate this new technique, finite element method simulations and numerous tests have been performed in a specially built synchronous generator with taps in one of the stator windings. In this way, several turn-to-turn faults have been created at different fault severity levels.

ACS Style

Carlos A. Platero; Konstantinos N. Gyftakis; Panagiotis A. Panagiotou; Alba Fernandez. Scheme for synchronous machine stator turn‐to‐turn protection. IET Electric Power Applications 2020, 14, 716 -722.

AMA Style

Carlos A. Platero, Konstantinos N. Gyftakis, Panagiotis A. Panagiotou, Alba Fernandez. Scheme for synchronous machine stator turn‐to‐turn protection. IET Electric Power Applications. 2020; 14 (4):716-722.

Chicago/Turabian Style

Carlos A. Platero; Konstantinos N. Gyftakis; Panagiotis A. Panagiotou; Alba Fernandez. 2020. "Scheme for synchronous machine stator turn‐to‐turn protection." IET Electric Power Applications 14, no. 4: 716-722.

Journal article
Published: 29 January 2020 in Sensors
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The analysis of the stray flux for electrical machine condition monitoring is a very modern and active research topic. Thanks to this technique, it is possible to detect several types of failures, including stator and rotor inter-turn faults, broken rotor bars and mechanical faults, among others. The main advantages are that it involves a non-invasive technique and low-cost monitoring equipment. The standard practice is to use coreless flux sensors, with which the stray flux of the machine is not perturbed and there are no problems due to saturation or nonlinear behavior of the iron. However, the induced voltage in the coreless coil sensor may be very low and even, in some cases, have a similar amplitude to the noise floor. This paper studies the use of iron core stray flux sensors for condition monitoring of electrical machines. The main advantage of iron core flux sensors is that the measured electromotive force is stronger. In the case of large machines in noisy environments, this can be crucial. Two different types of iron core stray flux sensors and a coreless flux sensor are tested. A comparison of the three sensors is presented. Extensive experimental testing with all sensors shows the superiority and greater sensitivity of sensors with core versus the coreless ones.

ACS Style

Pengfei Tian; Carlos A. Platero; Konstantinos N. Gyftakis; Jose Manuel Guerrero. Stray Flux Sensor Core Impact on the Condition Monitoring of Electrical Machines. Sensors 2020, 20, 749 .

AMA Style

Pengfei Tian, Carlos A. Platero, Konstantinos N. Gyftakis, Jose Manuel Guerrero. Stray Flux Sensor Core Impact on the Condition Monitoring of Electrical Machines. Sensors. 2020; 20 (3):749.

Chicago/Turabian Style

Pengfei Tian; Carlos A. Platero; Konstantinos N. Gyftakis; Jose Manuel Guerrero. 2020. "Stray Flux Sensor Core Impact on the Condition Monitoring of Electrical Machines." Sensors 20, no. 3: 749.

Journal article
Published: 16 January 2020 in Sustainability
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This paper analyzes the operating efficiency of a hybrid wind–hydro power plant located in El Hierro Island. This plant combines a wind farm (11.48 MW) and a pumped storage power plant (11.32 MW). It was built with the aim of supplying the island demand from renewable energy instead of using existing diesel units. The paper discusses several operational strategies and proposes an efficiency metric. Using 10 min data, the operation of this power plant has been simulated. From these simulations (more than 50,000 for a year), the operating efficiency and the percentage of demand covered from renewable energy is obtained. The difference between the worst and the best strategy is a twofold increase in efficiency. Moreover, the results of the simulations are compared with the system operational history since June 2015 (when the wind–hydro power plant started operation) until 2018. These comparisons show a reasonable agreement between simulations and operational history.

ACS Style

Francisco Briongos; Carlos A. Platero; José A. Sánchez-Fernández; Christophe Nicolet. Evaluation of the Operating Efficiency of a Hybrid Wind–Hydro Powerplant. Sustainability 2020, 12, 668 .

AMA Style

Francisco Briongos, Carlos A. Platero, José A. Sánchez-Fernández, Christophe Nicolet. Evaluation of the Operating Efficiency of a Hybrid Wind–Hydro Powerplant. Sustainability. 2020; 12 (2):668.

Chicago/Turabian Style

Francisco Briongos; Carlos A. Platero; José A. Sánchez-Fernández; Christophe Nicolet. 2020. "Evaluation of the Operating Efficiency of a Hybrid Wind–Hydro Powerplant." Sustainability 12, no. 2: 668.

Journal article
Published: 01 July 2019 in Energies
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The discharge resistor is only used in case of electrical trip to reduce the field current as fast as possible and to minimize the damages produced by the short-circuit current supplied by the synchronous machine. The connection of the discharge resistor is done by opening the field breaker and it implies a large negative voltage in the field winding. This negative voltage is limited to 80% of the winding insulation voltage. On the other hand, in case of a transient de-excitation, at the first moment, the automatic voltage regulator (AVR) reduces the field voltage to the minimum. In case of one-quadrant rectifier type AVR, the minimum voltage is zero and in case of two-quadrant rectifier AVR, the minimum voltage is close to the ceiling voltage with negative polarity. In both cases, the minimum voltages are much smaller than the negative voltage produced by the connection of the discharge resistor. This paper presents a new system that improves the transient de-excitation of synchronous machines using the discharge resistor by an additional static field breaker (SFB). The control of the static field breaker and consequently the connection and disconnection of the discharge resistor is done based on the output field voltage supplied by the AVR. This allows the exciter field current to be reduced in a faster way and continue with the normal operation of the machine after the transient. In this study, the correct operation of the additional static field breaker (SFB) has been validated by computer simulations and experimental test in a 15 MVA generator comprising a commercial one-quadrant rectifier AVR type obtaining excellent results.

ACS Style

Emilio Rebollo; Carlos A. Platero; David Talavera; Ricardo Granizo. Use of Discharge Resistor to Improve Transient De-Excitation in Brushless Synchronous Machines. Energies 2019, 12, 2528 .

AMA Style

Emilio Rebollo, Carlos A. Platero, David Talavera, Ricardo Granizo. Use of Discharge Resistor to Improve Transient De-Excitation in Brushless Synchronous Machines. Energies. 2019; 12 (13):2528.

Chicago/Turabian Style

Emilio Rebollo; Carlos A. Platero; David Talavera; Ricardo Granizo. 2019. "Use of Discharge Resistor to Improve Transient De-Excitation in Brushless Synchronous Machines." Energies 12, no. 13: 2528.

Journal article
Published: 03 May 2019 in IEEE Transactions on Industry Applications
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Doubly fed induction machines typically work as a generator in wind turbine systems and as motor/generator in pump storage hydropower plants. Nowadays they have an important role in the integration of renewable energies in power systems. This paper presents a new technique for differential protection of doubly fed induction machines, including the rotor. The proposed protection, which is based on the comparison of the vector components Id-Iq of the rotor and stator currents, can protect the whole induction machine during the internal faults. This protection considers the dynamic variation of the rotor frequency and the extremely low rotor frequency along the different operation points of the DFIM. The proposed method is validated using simulations on a 2 MW DFIM and the experimental results are obtained in a laboratory setup. The results show that the proposed differential protection effectively protects the entire induction machine during internal faults and does not trip in case of external faults

ACS Style

Mohammad Ebrahim Zarei; Carlos Antonio Platero; Carlos Veganzones Nicolas; Jaime Rodriguez Arribas; Carlos Veganzones. Novel Differential Protection Technique for Doubly Fed Induction Machines. IEEE Transactions on Industry Applications 2019, 55, 3697 -3706.

AMA Style

Mohammad Ebrahim Zarei, Carlos Antonio Platero, Carlos Veganzones Nicolas, Jaime Rodriguez Arribas, Carlos Veganzones. Novel Differential Protection Technique for Doubly Fed Induction Machines. IEEE Transactions on Industry Applications. 2019; 55 (4):3697-3706.

Chicago/Turabian Style

Mohammad Ebrahim Zarei; Carlos Antonio Platero; Carlos Veganzones Nicolas; Jaime Rodriguez Arribas; Carlos Veganzones. 2019. "Novel Differential Protection Technique for Doubly Fed Induction Machines." IEEE Transactions on Industry Applications 55, no. 4: 3697-3706.

Journal article
Published: 29 April 2019 in Energies
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This paper presents a novel method of hydro power plant operation, based on the control of the injectors’ or wicked gates opening time as a function of the upper reservoir level. In this way, a faster power injection, depending on the current water level on the upper reservoir, could be achieved. When this level is higher, the opening time could be shorter; hence, hydropower ramps could be steeper. Due to this control, frequency excursions and load shedding trips are smaller, thus the power quality is enhanced. This method has been tested and validated by computer simulations in a case study located in El Hierro island, Canary Archipelago (Spain). The simulations made show significant improvements, dependent on upper reservoir water level, in power quality.

ACS Style

Carlos A. Platero; José A. Sánchez; Christophe Nicolet; Philippe Allenbach. Hydropower Plants Frequency Regulation Depending on Upper Reservoir Water Level. Energies 2019, 12, 1637 .

AMA Style

Carlos A. Platero, José A. Sánchez, Christophe Nicolet, Philippe Allenbach. Hydropower Plants Frequency Regulation Depending on Upper Reservoir Water Level. Energies. 2019; 12 (9):1637.

Chicago/Turabian Style

Carlos A. Platero; José A. Sánchez; Christophe Nicolet; Philippe Allenbach. 2019. "Hydropower Plants Frequency Regulation Depending on Upper Reservoir Water Level." Energies 12, no. 9: 1637.

Journal article
Published: 03 December 2018 in Energies
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Ground faults in electrical power systems represent more than 90% of total faults. Their detection, location, and elimination are essential and must be carried out in a precise way to allow multiterminal high-voltage direct current (HVDC) cable networks to operate in stable conditions by removing only the faulty cable from service. This paper presents a new differential protection method based on the measurement of currents at both ends of the shields of power cables. This new method is cheaper and easier to set in operation compared to other protection methods that measure currents circulating in the active conductors. The values of such intensities and their polarities were evaluated to know which cable had a ground fault in a multiterminal HVDC cable network. The method was successfully validated by computer simulations, and experimental results were successfully obtained.

ACS Style

Ricardo Granizo Arrabé; Carlos A. Platero; Fernando Álvarez Gómez; Emilio Rebollo López. New Differential Protection Method for Multiterminal HVDC Cable Networks. Energies 2018, 11, 3387 .

AMA Style

Ricardo Granizo Arrabé, Carlos A. Platero, Fernando Álvarez Gómez, Emilio Rebollo López. New Differential Protection Method for Multiterminal HVDC Cable Networks. Energies. 2018; 11 (12):3387.

Chicago/Turabian Style

Ricardo Granizo Arrabé; Carlos A. Platero; Fernando Álvarez Gómez; Emilio Rebollo López. 2018. "New Differential Protection Method for Multiterminal HVDC Cable Networks." Energies 11, no. 12: 3387.

Journal article
Published: 23 October 2018 in Energies
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Frequency control is one of the most critical tasks in isolated power systems, especially in high renewable penetration scenarios. This paper presents a new hydropower pumped-storage dual control strategy that combines variable-speed-driven pumps and fixed-speed-driven pumps. A possible case for implementation of such a control scheme is described based on El Hierro Island’s power system. This isolated power system consists of a hybrid wind pumped-storage hydropower plant and diesel generators. The pumped-storage power plant is divided into a hydropower plant equipped with four Pelton turbines and a pump station equipped with both fixed- and variable-speed pumps. According to the proposed control scheme, frequency regulation will be provided by a dual controller: a continuous controller for the variable-speed pumps and a discrete controller for the fixed-speed pumps. The Pelton units, which operate as synchronous condensers, also supply the power system inertia. Therefore, diesel units may be disconnected, decreasing generation costs and greenhouse gas emissions. Owing to the combination of both controllers and the inertia of the Pelton units, an acceptable frequency regulation can be achieved. This technique has been validated through computer simulations.

ACS Style

José Ignacio Sarasúa; Guillermo Martínez-Lucas; Carlos A. Platero; José Ángel Sánchez-Fernández. Dual Frequency Regulation in Pumping Mode in a Wind–Hydro Isolated System. Energies 2018, 11, 2865 .

AMA Style

José Ignacio Sarasúa, Guillermo Martínez-Lucas, Carlos A. Platero, José Ángel Sánchez-Fernández. Dual Frequency Regulation in Pumping Mode in a Wind–Hydro Isolated System. Energies. 2018; 11 (11):2865.

Chicago/Turabian Style

José Ignacio Sarasúa; Guillermo Martínez-Lucas; Carlos A. Platero; José Ángel Sánchez-Fernández. 2018. "Dual Frequency Regulation in Pumping Mode in a Wind–Hydro Isolated System." Energies 11, no. 11: 2865.

Conference paper
Published: 01 September 2018 in 2018 XIII International Conference on Electrical Machines (ICEM)
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This paper discusses problems that can occur in synchronous generators during the paralleling connection process when connecting them to an electric network. Faulty or inadequate synchronization causes over-currents and high electromagnetic torque values that can damage generators. Moreover, it can cause power oscillations in the electric network that could collapse the system. Despite this risk, conventional synchronous generator protection systems do not trip specifically during faulty synchronization. A new protection method, based on an instantaneous overcurrent protection for electric generators during faulty synchronization incidents, is presented in this paper. The method is verified by computer simulations of a thermal power plant turbo alternator.

ACS Style

Pengfei Tian; C.A. Platero; F. Blazquez. Protection Method for Synchronous Machine During the Paralleling Connection Process. 2018 XIII International Conference on Electrical Machines (ICEM) 2018, 2385 -2390.

AMA Style

Pengfei Tian, C.A. Platero, F. Blazquez. Protection Method for Synchronous Machine During the Paralleling Connection Process. 2018 XIII International Conference on Electrical Machines (ICEM). 2018; ():2385-2390.

Chicago/Turabian Style

Pengfei Tian; C.A. Platero; F. Blazquez. 2018. "Protection Method for Synchronous Machine During the Paralleling Connection Process." 2018 XIII International Conference on Electrical Machines (ICEM) , no. : 2385-2390.

Journal article
Published: 19 June 2018 in Energies
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The 2 × 25 kV power supply system is the most frequently used traction rail system to provide the huge power needed by high-speed trains. However, locating the ground fault in this power supply system is more complicated than in other configurations of electrical railway power supply due to the installation of autotransformers throughout the line section. In previous papers, the authors have described a ground fault location method with an insignificant installation cost. The method and, moreover, the location discriminate between whether the ground fault is located between a positive conductor and ground or a negative conductor and ground. The current of the high-speed train influences the accuracy of the location of the ground fault. An additional factor which influences the location method is the existence of an arc resistance between the positive or negative conductor and ground. In this paper, the influence of high-speed train currents and arc resistances are analysed to evaluate the error in the location method. The major conclusion of the paper is that the location method has an acceptable precision even taking into consideration the high-speed train current and arc resistance. The validation of the method has been performed by laboratory tests and computer simulations with satisfactory results.

ACS Style

Carlos A. Platero; Jesus Serrano; Máximo López-Toledo; Ricardo Granizo. Influence of High-Speed Train Power Consumption and Arc Fault Resistances on a Novel Ground Fault Location Method for 2 × 25 kV Railway Power Supply Systems. Energies 2018, 11, 1601 .

AMA Style

Carlos A. Platero, Jesus Serrano, Máximo López-Toledo, Ricardo Granizo. Influence of High-Speed Train Power Consumption and Arc Fault Resistances on a Novel Ground Fault Location Method for 2 × 25 kV Railway Power Supply Systems. Energies. 2018; 11 (6):1601.

Chicago/Turabian Style

Carlos A. Platero; Jesus Serrano; Máximo López-Toledo; Ricardo Granizo. 2018. "Influence of High-Speed Train Power Consumption and Arc Fault Resistances on a Novel Ground Fault Location Method for 2 × 25 kV Railway Power Supply Systems." Energies 11, no. 6: 1601.

Conference paper
Published: 01 February 2018 in 2018 IEEE International Conference on Industrial Technology (ICIT)
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The monitoring of electrical machines is based on current measurement in most of the cases. For this purpose the use of current transformer is a common practice and currently the use of non-toroidal shape primary pass-through current transformers is increasing. Some problems in the monitoring and protection of large transformers and motors have been detected when this type of current transformer have been employed, with several cables per phase. The transient response of the current transformers is essential for the correct operation of the monitoring system. During the starting or in short-circuit condition, high current flows into the primary and secondary windings and as result large flux and electromagnetic forces are developed. This paper presents the advantages of testing non-toroidal shape primary pass-through current transformer with high current primary injection instead of secondary voltage injection as it is normally do.

ACS Style

C. A. Platero; R. Granizo; F. Blazquez; E. Marchesi. Testing of non-toroidal shape primary pass-through current transformer for electrical machine monitoring and protection. 2018 IEEE International Conference on Industrial Technology (ICIT) 2018, 1854 -1858.

AMA Style

C. A. Platero, R. Granizo, F. Blazquez, E. Marchesi. Testing of non-toroidal shape primary pass-through current transformer for electrical machine monitoring and protection. 2018 IEEE International Conference on Industrial Technology (ICIT). 2018; ():1854-1858.

Chicago/Turabian Style

C. A. Platero; R. Granizo; F. Blazquez; E. Marchesi. 2018. "Testing of non-toroidal shape primary pass-through current transformer for electrical machine monitoring and protection." 2018 IEEE International Conference on Industrial Technology (ICIT) , no. : 1854-1858.

Research articles
Published: 01 April 2017 in IET Electric Power Applications
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Synchronous generators with brushless excitation have the disadvantage that the field winding is not accessible for the de-excitation of the generator. This means that, despite the proper operation of the protection system, the large de-excitation time constant may produce severe damage in the event of an internal short circuit. This paper describes a novel high speed de-excitation system (HSBDS) aimed at limiting the damage in the synchronous generator in case of an internal short circuit. The HSBDS for these generators was developed and it is in commercial operation. However in a power plant is not possible to test the operation of the HSBDS under sudden short circuit. This paper presents the results of a several tests in a laboratory 15 MVA brushless synchronous machine where internally reduced voltage sudden short-circuits have been performed. As a rated voltage short circuit could damage the laboratory 15 MVA machine, a computer model has been developed in order to assess the performance of the HSBDS in a real short circuit at rated voltage. The HSBDS under sudden short circuit conditions has been evaluated and validated through laboratory tests and computer simulations with satisfactory results.

ACS Style

Emilio Rebollo; Carlos A. Platero; Francisco Blazquez; Ricardo Granizo. Internal sudden short‐circuit response of a new HSBDS for brushless synchronous machines tested on a 15 MVA generator. IET Electric Power Applications 2017, 11, 495 -503.

AMA Style

Emilio Rebollo, Carlos A. Platero, Francisco Blazquez, Ricardo Granizo. Internal sudden short‐circuit response of a new HSBDS for brushless synchronous machines tested on a 15 MVA generator. IET Electric Power Applications. 2017; 11 (4):495-503.

Chicago/Turabian Style

Emilio Rebollo; Carlos A. Platero; Francisco Blazquez; Ricardo Granizo. 2017. "Internal sudden short‐circuit response of a new HSBDS for brushless synchronous machines tested on a 15 MVA generator." IET Electric Power Applications 11, no. 4: 495-503.