The Experts below are selected from a list of 129 Experts worldwide ranked by ideXlab platform
Shamsul Aizam Zulkifli - One of the best experts on this subject based on the ideXlab platform.
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Phase-Frequency Controlled In Virtual Synchronous Converter for Low-Voltage Microgrid-Inverter Synchronization
International Journal of Renewable Energy Research, 2017Co-Authors: Ruhul Amin, Shamsul Aizam ZulkifliAbstract:In this paper, it will explain an internal voltage controlled based on generator swing technique/dynamic response in virtual Synchronous Converter (VSCon) in order to achieve voltage synchronization between low voltage microgrid and inverter. As known, PLL is a common technique in order to synchronize the amplitude, phase-angle and frequency between microgrid and inverter for voltage connection. VSCon is a technique does not require any phase locked loop (PLL) circuit as an external control structure for the inverter synchronization function. This VSCon has been modeled and simulated in Matlab/Simulink software, with single-phase source input system connected with several loads variation. This VSCon has been implemented in inverter control to generate a pulse width modulation (PWM) signal that respond with the grid information in order to synchronize the inverter output voltage with the grid voltage without using the PLL. Several simulation tests have been conducted to prove the reliability of this VSCon. It also has been tested when the grid frequency changes from the rated frequency to 51Hz where the result shows that, VSCon takes nearly 20ms to synchronize to this changes frequency value.
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Modelling of Virtual Synchronous Converter for Grid-inverter Synchronization in Microgrids Applications
International Journal of Parallel Emergent and Distributed Systems, 2016Co-Authors: Ruhul Amin, Shamsul Aizam ZulkifliAbstract:In this paper, virtual Synchronous Converter (VSCon) is modelled which behaves as Synchronous generator including its all real-time characteristics in operating inverter. This VSCon is used to synchronize grid and inverter while integrating distributed generated power to microgrids. The frequency and voltage synchronization can be controlled by using Synchronous generator mathematical model is installed into the inverter. The whole unit of VSCon operated is simulated in Matlab/Simulink for observing all consequences for synchronizing voltage, frequency and phase-angle. It is verified that the next generation energy resources can be integrated into microgrid making synchronization grid-inverter using VSCon. The simulation results are given to verify the concept of modelling VSCon functioning inverter as a Synchronous generator.
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Non-PLL for fast grid-inverter synchronization in microgrids applications
2016 IEEE International Conference on Power and Energy (PECon), 2016Co-Authors: Md Ruhul Amin, Shamsul Aizam ZulkifliAbstract:In this paper, a fast-synchronization between grid and inverter based on virtual Synchronous Converter (VSCon) technique is achieved in single-phase inverter. Consequently, this technique is designed and simulated in Matlab/Simulink platform to perceive the significances during variation of grid load parameters. The VSCon is implemented for inverter output control that has a behavior of grid voltage and frequency synchronization using droop control mechanism. This technique has been tested in inverter-microgrid connection with several loads connected. In case of 0.1 Hz grid frequency changes in grid test, it takes nearly 230ms to synchronize between inverter and grid frequency even with loads connected to the test system. Hence, this proposed technique can be implemented in microgrids with several distributed generation sources without using the PLL for fast synchronization between grid-inverters.
Bernhard Wicht - One of the best experts on this subject based on the ideXlab platform.
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A 10 MHz, 48-to-5V Synchronous Converter with dead time enabled 125 ps resolution zero-voltage switching
2016 IEEE Applied Power Electronics Conference and Exposition (APEC), 2016Co-Authors: Alexander Barner, Juergen Wittmann, Thoralf Rosahl, Bernhard WichtAbstract:An integrated Synchronous buck Converter with a high resolution dead time control for input voltages up to 48V and 10MHz switching frequency is presented. The benefit of an enhanced dead time control at light loads to enable zero voltage switching at both the high-side and low-side switch at low output load is studied. This way, compact multi-MHz DCDC Converters can be implemented at high efficiency over a wide load current range. The concept also eliminates body diode forward conduction losses and minimizes reverse recovery losses. A dead time resolution of 125 ps is realized by an 8-bit differential delay chain. A further efficiency enhancement by soft switching at the high-side switch at light load is achieved with a voltage boost of the switching node by dead time control in forced continuous conduction mode. The monolithic Converter is implemented in an 180nm high-voltage BiCMOS technology. At VIN = 48V, VOUT = 5V, 50mA load, 10MHz switching frequency and 500 nH output inductance, the efficiency is measured to be increased by 14.4% compared to a conventional predictive dead time control. A peak efficiency of 80.9% is achieved at 12V input.
Qi Cheng - One of the best experts on this subject based on the ideXlab platform.
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A high-frequency non-isolated ZVS Synchronous buck-boost LED driver with fully-integrated dynamic dead-time controlled gate drive
2018 IEEE Applied Power Electronics Conference and Exposition (APEC), 2018Co-Authors: Qi ChengAbstract:This paper presents a high-efficiency and high-frequency non-isolated ZVS Synchronous buck-boost LED driver for automotive lighting applications. The Synchronous gate driver IC with embedded high-and low-side ZVS detection is developed to generate dynamic dead-time with minimized detection delay. This enables high-frequency low-loss ZVS operation in the non-isolated Synchronous Converter topology over wide ranges of the input voltage and the output LED number. The buck-boost LED driver with eGaN FETs and the gate driver IC designed in a 0.5μm HV CMOS process can support up to 20 series-connected LEDs and achieve a peak power efficiency of 94.2% at 2.5-MHz switching frequency.
Ruhul Amin - One of the best experts on this subject based on the ideXlab platform.
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Self-synchronized Converter for fast synchronization between low voltage microgrid and inverter connection
2020Co-Authors: Ruhul AminAbstract:In this research, a fast-synchronization between single-phase microgrid and inverter in low voltage, which is based on virtual Synchronous Converter (VSCon) technique is been developed. This technique does not require any phase locked loop (PLL) circuit as an external control structure for the synchronization of the inverter. As known, PLL is a common technique in order to synchronize the amplitude, phase-angle and frequency between a microgrid and an inverter in distributed generation network. Previous studies show that, the disadvantage of PLLs is where the non-linear characteristic on the signal process will result the inverter control to be non-linear. Therefore, it is difficult and lengthy process to tune the PLL gains to reach suitable performance in order to synchronize the voltage, phase-angle and frequency between microgrid and inverter. As a result, a VSCon is been developed in which it is a selfsynchronized inverter which is based on Synchronous generator mathematical model. This controller acts like as Synchronous generator operating system in inverter control loop in order to achieve fast voltage, phase and frequency synchronization between inverter-microgrid connection. This technique has been modeled, simulated and tested in Matlab/Simulink software. It is by using a single-phase AC source input system connecting with several load variations during simulation period. This VSCon has been placed in inverter control loop to generate a pulse width modulation (PWM) signal that responds to the grid information for to synchronizing the inverter output voltage with the grid voltage. A single source input at 120V, 50Hz frequency and 240V, 50Hz frequency are used in order to see the self-synchronization response between a microgrid and an inverter. Furthermore, it also been tested when the grid frequency has been changed from the rated frequency at 50Hz to 51Hz and the result shows that, VSCon takes nearly 1-cycle to synchronize to this new frequency value. The grid phase angle test also has been conducted. For this test, the voltage grid which has 100 phase delay has been created in the input voltage source at microgrid side. As a result, the VSCon is also able to achieve self-synchronization with this new source input phase delay in just within 1.5 cycles or 30ms after the inverter has been connected to the microgrid. From all the results that have been collected, this technique can be an improved model for inverter to have synchronization between inverter and microgrid which is not require a PLL circuitry model in order to maximize the power transfer from the inverter to the microgrid when it been applied to the distributed generation network.
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Phase-Frequency Controlled In Virtual Synchronous Converter for Low-Voltage Microgrid-Inverter Synchronization
International Journal of Renewable Energy Research, 2017Co-Authors: Ruhul Amin, Shamsul Aizam ZulkifliAbstract:In this paper, it will explain an internal voltage controlled based on generator swing technique/dynamic response in virtual Synchronous Converter (VSCon) in order to achieve voltage synchronization between low voltage microgrid and inverter. As known, PLL is a common technique in order to synchronize the amplitude, phase-angle and frequency between microgrid and inverter for voltage connection. VSCon is a technique does not require any phase locked loop (PLL) circuit as an external control structure for the inverter synchronization function. This VSCon has been modeled and simulated in Matlab/Simulink software, with single-phase source input system connected with several loads variation. This VSCon has been implemented in inverter control to generate a pulse width modulation (PWM) signal that respond with the grid information in order to synchronize the inverter output voltage with the grid voltage without using the PLL. Several simulation tests have been conducted to prove the reliability of this VSCon. It also has been tested when the grid frequency changes from the rated frequency to 51Hz where the result shows that, VSCon takes nearly 20ms to synchronize to this changes frequency value.
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Modelling of Virtual Synchronous Converter for Grid-inverter Synchronization in Microgrids Applications
International Journal of Parallel Emergent and Distributed Systems, 2016Co-Authors: Ruhul Amin, Shamsul Aizam ZulkifliAbstract:In this paper, virtual Synchronous Converter (VSCon) is modelled which behaves as Synchronous generator including its all real-time characteristics in operating inverter. This VSCon is used to synchronize grid and inverter while integrating distributed generated power to microgrids. The frequency and voltage synchronization can be controlled by using Synchronous generator mathematical model is installed into the inverter. The whole unit of VSCon operated is simulated in Matlab/Simulink for observing all consequences for synchronizing voltage, frequency and phase-angle. It is verified that the next generation energy resources can be integrated into microgrid making synchronization grid-inverter using VSCon. The simulation results are given to verify the concept of modelling VSCon functioning inverter as a Synchronous generator.
Alexander Barner - One of the best experts on this subject based on the ideXlab platform.
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A 10 MHz, 48-to-5V Synchronous Converter with dead time enabled 125 ps resolution zero-voltage switching
2016 IEEE Applied Power Electronics Conference and Exposition (APEC), 2016Co-Authors: Alexander Barner, Juergen Wittmann, Thoralf Rosahl, Bernhard WichtAbstract:An integrated Synchronous buck Converter with a high resolution dead time control for input voltages up to 48V and 10MHz switching frequency is presented. The benefit of an enhanced dead time control at light loads to enable zero voltage switching at both the high-side and low-side switch at low output load is studied. This way, compact multi-MHz DCDC Converters can be implemented at high efficiency over a wide load current range. The concept also eliminates body diode forward conduction losses and minimizes reverse recovery losses. A dead time resolution of 125 ps is realized by an 8-bit differential delay chain. A further efficiency enhancement by soft switching at the high-side switch at light load is achieved with a voltage boost of the switching node by dead time control in forced continuous conduction mode. The monolithic Converter is implemented in an 180nm high-voltage BiCMOS technology. At VIN = 48V, VOUT = 5V, 50mA load, 10MHz switching frequency and 500 nH output inductance, the efficiency is measured to be increased by 14.4% compared to a conventional predictive dead time control. A peak efficiency of 80.9% is achieved at 12V input.
