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June-Hee Lee
School of Electronics and Electrical Engineering, Dankook University, Yongin 16890, South Korea

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Journal article
Published: 28 May 2021 in IEEE Journal of Emerging and Selected Topics in Power Electronics
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In this paper, fault diagnosis and tolerant control methods are proposed for an open-switch fault in a Vienna rectifier. The proposed diagnosis method uses only the input currents to detect an open-switch fault without any additional hardware. In the proposed tolerant control, the offset voltage is used to restore the input currents when an open-switch fault occurs in a Vienna rectifier. In addition, the proposed tolerant control considers the balance of the neutral-point voltage. This method can improve the total harmonic distortion of the current and mitigate the DC-link voltage ripple. The effectiveness of the proposed open-switch fault diagnosis and tolerant control method is verified by simulated and experimental results.

ACS Style

J. H. Park; J. S. Lee; M. Y. Kim; K. B. Leea. Diagnosis and Tolerant Control Methods for an Open-Switch Fault in a Vienna Rectifier. IEEE Journal of Emerging and Selected Topics in Power Electronics 2021, PP, 1 -1.

AMA Style

J. H. Park, J. S. Lee, M. Y. Kim, K. B. Leea. Diagnosis and Tolerant Control Methods for an Open-Switch Fault in a Vienna Rectifier. IEEE Journal of Emerging and Selected Topics in Power Electronics. 2021; PP (99):1-1.

Chicago/Turabian Style

J. H. Park; J. S. Lee; M. Y. Kim; K. B. Leea. 2021. "Diagnosis and Tolerant Control Methods for an Open-Switch Fault in a Vienna Rectifier." IEEE Journal of Emerging and Selected Topics in Power Electronics PP, no. 99: 1-1.

Journal article
Published: 24 September 2020 in Energies
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This paper suggests the reasonable switching frequency determination method for achieving highest efficiency of the railway propulsion system consisting the silicon carbide (SiC) inverter and permanent magnet synchronous motor (PMSM). The SiC power device allows increasing the switching frequency of the inverter because it has the small switching power loss. The total efficiency is taken into account for determining the switching frequency of SiC inverter in this paper. In the efficiency analysis of SiC inverter and PMSM, the PMSM drive control is considered with the hybrid switching method combined the synchronous PWM and asynchronous PWM. The result of the analysis shows the efficiency curve of propulsion system depending on the switching frequency. The switching frequency having the minimum power loss of propulsion system is selected based on the extracted power loss curve.

ACS Style

Joon-Hyoung Ryu; June-Hee Lee; June-Seok Lee. Switching Frequency Determination of SiC-Inverter for High Efficiency Propulsion System of Railway Vehicle. Energies 2020, 13, 5035 .

AMA Style

Joon-Hyoung Ryu, June-Hee Lee, June-Seok Lee. Switching Frequency Determination of SiC-Inverter for High Efficiency Propulsion System of Railway Vehicle. Energies. 2020; 13 (19):5035.

Chicago/Turabian Style

Joon-Hyoung Ryu; June-Hee Lee; June-Seok Lee. 2020. "Switching Frequency Determination of SiC-Inverter for High Efficiency Propulsion System of Railway Vehicle." Energies 13, no. 19: 5035.

Journal article
Published: 23 July 2020 in IEEE Transactions on Power Electronics
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This paper proposes the harmonic voltage injection pulse-width modulation method for Vienna rectifier with an LCL-filter. The existing PWM methods for Vienna rectifier with the full power factor can lead to the resonant problem. It generates the current oscillation at the resonant frequency. Therefore, it is analyzed that why the resonant problem occurs in Vienna rectifier with the existing PWM methods. Then, to solve this problem, the proposed method injects the sinusoidal harmonic voltage to the sinusoidal reference voltage in this paper. The magnitude and phase of the injection voltage is determined by the power factor of the rectifier-side. Compared to other PWM methods, the possibility of the resonant problem is eliminated by using the proposed PWM method. This paper suggests the design process of an LCL-filter considering the operation characteristics of the proposed PWM method. The effectiveness and performance of the proposed PWM method and the design process of an LCL-filter are verified by simulation and experiment.

ACS Style

Jin-Hyuk Park; June-Seok Lee; Kyo-Beum Lee. Sinusoidal Harmonic Voltage Injection PWM Method for Vienna Rectifier With an LCL Filter. IEEE Transactions on Power Electronics 2020, 36, 2875 -2888.

AMA Style

Jin-Hyuk Park, June-Seok Lee, Kyo-Beum Lee. Sinusoidal Harmonic Voltage Injection PWM Method for Vienna Rectifier With an LCL Filter. IEEE Transactions on Power Electronics. 2020; 36 (3):2875-2888.

Chicago/Turabian Style

Jin-Hyuk Park; June-Seok Lee; Kyo-Beum Lee. 2020. "Sinusoidal Harmonic Voltage Injection PWM Method for Vienna Rectifier With an LCL Filter." IEEE Transactions on Power Electronics 36, no. 3: 2875-2888.

Journal article
Published: 28 May 2020 in IEEE Access
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This paper proposes a rotation carrier-based discontinuous pulse width modulation (CB-DPWM) method for the five-leg inverter (FLI). The FLI based on two-level topology consists of 10 switching devices for driving dual motors. Therefore, two switching devices can be reduced to compare the configuration using two three-leg inverters for driving dual motors. The proposed pulse width modulation (PWM) method is based on the reference signals which are used in existing carrier-based continuous pulse width modulation (CB-CPWM) method for FLI. In the proposed rotation CB-DPWM method, one of five-leg is periodically clamped to Vdc/2 or -Vdc/2 by adding the offset voltage to the reference voltages of the existing CB-CPWM method. The five reference voltages for all legs are considered to calculate the offset voltage of the proposed rotation CB-DPWM method. Consequently, since the proposed rotation CB-DPWM method has the fewer number of switching than that of the existing CB-CPWM, the switching loss can be reduced and it results in the efficiency improvement. Simulation and experimental results confirm the effectiveness and feasibility of the proposed method.

ACS Style

June-Hee Lee; Joon-Hyoung Ryu. Carrier-Based Discontinuous PWM Method for Five-Leg Inverter. IEEE Access 2020, 8, 100323 -100336.

AMA Style

June-Hee Lee, Joon-Hyoung Ryu. Carrier-Based Discontinuous PWM Method for Five-Leg Inverter. IEEE Access. 2020; 8 (99):100323-100336.

Chicago/Turabian Style

June-Hee Lee; Joon-Hyoung Ryu. 2020. "Carrier-Based Discontinuous PWM Method for Five-Leg Inverter." IEEE Access 8, no. 99: 100323-100336.

Journal article
Published: 06 March 2020 in Energies
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The cost of the PV energy reduction is still required to increase the penetration level of PV systems in the energy market. The reliability of PV inverters is one of the important aspects to be enhanced in order to reduce the cost of PV energy, since it is closely related to the maintenance cost and the annual energy production. In this paper, the lifetime of NPC and T-type inverters, which are three-level inverter topologies that are widely used for PV systems, are comparatively evaluated with a 30 kW grid-connected PV system. It is performed by focusing on power devices since the power electronic components of both converters are the same except for the power devices. Therefore, this result can represent the comparison of the reliability performance of the NPC and T-type inverters. The power loss and temperature distributions of power devices are analyzed and their efficiencies are compared at different power levels with different switching frequencies. The lifetimes of the reliability-critical power devices in the NPC and T-type inverters are estimated, respectively with a one-year mission profile of the PV system, and the results are compared.

ACS Style

Ui-Min Choi; June-Seok Lee. Comparative Evaluation of Lifetime of Three-Level Inverters in Grid-Connected Photovoltaic Systems. Energies 2020, 13, 1227 .

AMA Style

Ui-Min Choi, June-Seok Lee. Comparative Evaluation of Lifetime of Three-Level Inverters in Grid-Connected Photovoltaic Systems. Energies. 2020; 13 (5):1227.

Chicago/Turabian Style

Ui-Min Choi; June-Seok Lee. 2020. "Comparative Evaluation of Lifetime of Three-Level Inverters in Grid-Connected Photovoltaic Systems." Energies 13, no. 5: 1227.

Journal article
Published: 01 January 2020 in IEEE Access
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ACS Style

Seok-Min Kim; Eui-Jae Lee; June-Seok Lee; Kyo-Beum Lee. An Improved Phase-Shifted DPWM Method for Reducing Switching Loss and Thermal Balancing in Cascaded H-Bridge Multilevel Inverter. IEEE Access 2020, 8, 187072 -187083.

AMA Style

Seok-Min Kim, Eui-Jae Lee, June-Seok Lee, Kyo-Beum Lee. An Improved Phase-Shifted DPWM Method for Reducing Switching Loss and Thermal Balancing in Cascaded H-Bridge Multilevel Inverter. IEEE Access. 2020; 8 ():187072-187083.

Chicago/Turabian Style

Seok-Min Kim; Eui-Jae Lee; June-Seok Lee; Kyo-Beum Lee. 2020. "An Improved Phase-Shifted DPWM Method for Reducing Switching Loss and Thermal Balancing in Cascaded H-Bridge Multilevel Inverter." IEEE Access 8, no. : 187072-187083.

Journal article
Published: 09 December 2019 in Energies
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In this paper, the effect of the heat-pipe cooling system design processes on the reliability of the power module in a railway propulsion inverter was investigated. The existing design processes for the heat-pipe cooling system guarantee that the junction temperature of power devices does not exceed the maximum allowable junction temperature when the railway propulsion inverter operates under its mission profile; therefore, each step of the design process was reviewed to analyze the effect of the heat-pipe cooling system. Based on the processes, in the calculation for the required thermal resistance of the heat-pipe cooling system, two difference losses were considered with the thermal resistances of the insulated gate bipolar mode transistor (IGBT) module and the thermal grease at an interface between the baseplate of IGBT module and heat-pipe cooling system. The control scheme and mission profile of the train were taken into account to calculate the power losses. Then, the designed heat-pipe cooling systems were compared in terms of the size and weight. In addition, the junction temperatures and lifetimes of the power module with heat-pipe cooling systems designed by different power losses were estimated and compared. Finally, guidelines for a heat-pipe system cooling design are proposed.

ACS Style

June-Seok Lee; Ui-Min Choi. Comparison of Heat-Pipe Cooling System Design Processes in Railway Propulsion Inverter Considering Power Module Reliability. Energies 2019, 12, 4676 .

AMA Style

June-Seok Lee, Ui-Min Choi. Comparison of Heat-Pipe Cooling System Design Processes in Railway Propulsion Inverter Considering Power Module Reliability. Energies. 2019; 12 (24):4676.

Chicago/Turabian Style

June-Seok Lee; Ui-Min Choi. 2019. "Comparison of Heat-Pipe Cooling System Design Processes in Railway Propulsion Inverter Considering Power Module Reliability." Energies 12, no. 24: 4676.

Journal article
Published: 27 March 2019 in IEEE Transactions on Power Electronics
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This paper proposes the predictive control with the discrete space-vector modulation (DSVM) for Vienna rectifier connecting to the permanent magnet synchronous generator (PMSG) of the wind turbine system (WTS). Since Vienna rectifier has the special operation principle, Vienna rectifier generates only the feasible eight voltage vectors, which can be candidate vector for the predictive control, depending on the sign of the output currents. In the proposed predictive control, the feasible voltage vectors are extended from 8 to 19 consisting the 8 original voltage vectors and 11 virtual voltage vectors by using the DSVM for improving the current quality related to the torque ripple, vibration, and noise, and the neutral-point voltage balance with low voltage ripple is guaranteed by using the offset value calculated based on the model of two dc-link capacitor in Vienna rectifier. The scheme for reducing calculation burden is applied in selecting the candidate vector. In addition, the limited operation range for the maximum torque per ampere (MTPA) operation of PMSG connected to Vienna rectifier is analyzed. The performance of the proposed predictive control with DSVM for Vienna rectifier with PMSGs is verified in simulation and experiment.

ACS Style

June-Seok Lee; Kyo-Beum Lee; Frede Blaabjerg. Predictive Control With Discrete Space-Vector Modulation of Vienna Rectifier for Driving PMSG of Wind Turbine Systems. IEEE Transactions on Power Electronics 2019, 34, 12368 -12383.

AMA Style

June-Seok Lee, Kyo-Beum Lee, Frede Blaabjerg. Predictive Control With Discrete Space-Vector Modulation of Vienna Rectifier for Driving PMSG of Wind Turbine Systems. IEEE Transactions on Power Electronics. 2019; 34 (12):12368-12383.

Chicago/Turabian Style

June-Seok Lee; Kyo-Beum Lee; Frede Blaabjerg. 2019. "Predictive Control With Discrete Space-Vector Modulation of Vienna Rectifier for Driving PMSG of Wind Turbine Systems." IEEE Transactions on Power Electronics 34, no. 12: 12368-12383.

Journal article
Published: 27 April 2018 in IEEE Journal of Emerging and Selected Topics in Power Electronics
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This paper proposes an improved finite set model predictive control (FS-MPC) to reduce current ripples and balance the neutral-point voltage for grid connected three level voltage source inverter. The proposed finite set model predictive current control (FS-MPCC) is based on the discrete space vector modulation (DSVM) to synthesize various voltage vectors. The proposed DSVM method enables to calculate all of the virtual voltage vector values immediately without the lookup table. To overcome excessive computation burden problem, optimal region determination strategy is presented in order to use only minimum number of voltage vectors for the cost function calculation. To balance the neutral point voltage, the proposed offset voltage injection (OVI) method based on the FS-MPC is introduced in this paper. Various offset voltage values are obtained and an optimal offset voltage value is determined by using the MPC algorithm. Since the proposed control method is based on space vector diagram without being restricted by the switching states, it can be easily applied to a multi-level system or other applications. The simulation and experiment results are presented to validate the effectiveness and performance of the proposed method using the grid-connected three-level T-type voltage source inverter.

ACS Style

June-Hee Lee; Hyun-Cheol Moon; Kyo-Beum Lee. An Improved Finite-Set Model Predictive Control Based on Discrete Space Vector Modulation Methods for Grid-Connected Three-Level Voltage Source Inverter. IEEE Journal of Emerging and Selected Topics in Power Electronics 2018, 6, 1744 -1760.

AMA Style

June-Hee Lee, Hyun-Cheol Moon, Kyo-Beum Lee. An Improved Finite-Set Model Predictive Control Based on Discrete Space Vector Modulation Methods for Grid-Connected Three-Level Voltage Source Inverter. IEEE Journal of Emerging and Selected Topics in Power Electronics. 2018; 6 (4):1744-1760.

Chicago/Turabian Style

June-Hee Lee; Hyun-Cheol Moon; Kyo-Beum Lee. 2018. "An Improved Finite-Set Model Predictive Control Based on Discrete Space Vector Modulation Methods for Grid-Connected Three-Level Voltage Source Inverter." IEEE Journal of Emerging and Selected Topics in Power Electronics 6, no. 4: 1744-1760.

Journal article
Published: 02 January 2018 in Applied Sciences
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This paper presents a low-voltage ride-through (LVRT) control strategy for grid-connected energy storage systems (ESSs). In the past, researchers have investigated the LVRT control strategies to apply them to wind power generation (WPG) and solar energy generation (SEG) systems. Regardless of the energy source, the main purpose of the LVRT control strategies is to inject reactive power into the grid depending on the grid-code regulations using the grid-side inverter; the proposed LVRT control strategy for grid-connected ESSs also has the same purpose. However, unlike the WPG and SEG systems having unidirectional power flow, grid-connected ESSs have a bidirectional power flow. Therefore, the charging condition of the grid-connected ESSs should be considered for the LVRT control strategy. The proposed LVRT control strategy for grid-connected ESSs determines the injection quantity of the active and reactive currents, and the strategy depends on the voltage drop ratio of the three-phase grid. Additionally, in this paper, we analyzed the variations of the point of common coupling (PCC) voltage depending on the phase of the reactive current during the charging and discharging conditions. The validity of the proposed LVRT control strategy is verified and the variations of the PCC voltage of the grid-connected ESS are analyzed by simulation and experimental results.

ACS Style

Yeongsu Bak; June-Seok Lee; Kyo-Beum Lee. Low-Voltage Ride-Through Control Strategy for a Grid-Connected Energy Storage System. Applied Sciences 2018, 8, 57 .

AMA Style

Yeongsu Bak, June-Seok Lee, Kyo-Beum Lee. Low-Voltage Ride-Through Control Strategy for a Grid-Connected Energy Storage System. Applied Sciences. 2018; 8 (1):57.

Chicago/Turabian Style

Yeongsu Bak; June-Seok Lee; Kyo-Beum Lee. 2018. "Low-Voltage Ride-Through Control Strategy for a Grid-Connected Energy Storage System." Applied Sciences 8, no. 1: 57.

Journal article
Published: 13 November 2017 in IEEE Transactions on Industrial Electronics
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This paper analyzes the combination in a cascaded H-bridge multilevel inverter (CHBI) based on transformers with the different turns-ratios for increasing the voltage level and proposes the switching method for achieving the output voltage distribution among H-bridge cells (HBCs). The transformers used in this paper are connected to output of the respective HBCs and the secondary sides of all the transformers are connected in series for generating the final output voltage. Only one of the transformers, in particular, has a different turns-ratio for increasing the output voltage level. In this paper, the possible turns-ratio of the special transformer with a different turns-ratio is discussed in detail and a switching method based on the level-shifted switching method for the topology used in this paper is proposed. To verify the effectiveness of the proposed method, a three-phase 21-level CHBI is experimentally tested.

ACS Style

June-Seok Lee; Hyun-Woo Sim; Juyong Kim; Kyo-Beum Lee. Combination Analysis and Switching Method of a Cascaded H-Bridge Multilevel Inverter Based on Transformers With the Different Turns Ratio for Increasing the Voltage Level. IEEE Transactions on Industrial Electronics 2017, 65, 4454 -4465.

AMA Style

June-Seok Lee, Hyun-Woo Sim, Juyong Kim, Kyo-Beum Lee. Combination Analysis and Switching Method of a Cascaded H-Bridge Multilevel Inverter Based on Transformers With the Different Turns Ratio for Increasing the Voltage Level. IEEE Transactions on Industrial Electronics. 2017; 65 (6):4454-4465.

Chicago/Turabian Style

June-Seok Lee; Hyun-Woo Sim; Juyong Kim; Kyo-Beum Lee. 2017. "Combination Analysis and Switching Method of a Cascaded H-Bridge Multilevel Inverter Based on Transformers With the Different Turns Ratio for Increasing the Voltage Level." IEEE Transactions on Industrial Electronics 65, no. 6: 4454-4465.

Journal article
Published: 22 March 2017 in IEEE Transactions on Industrial Electronics
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This paper underpins the principles for generating reactive power in single-phase transformerless photovoltaic (PV) inverters. Two mainstream and widely adopted PV inverters are explored, i.e., H5 and HERIC. With conventional modulation techniques, reactive power cannot be realized in H5 and HERIC due to the absence of freewheeling path in negative power region. Based on the study, modulation techniques are proposed to provide bidirectional current path during freewheeling period. With proposed modulation technique, reactive power control is achieved in H5 and HERIC inverters, without any modification on the converter structures. The performances of the proposed modulation techniques are studied via MATLAB simulation and further validated with experimental results.

ACS Style

Tan Kheng Suan Freddy; June-Hee Lee; Hyun-Cheol Moon; Kyo-Beum Lee; Nasrudin Abd Rahim. Modulation Technique for Single-Phase Transformerless Photovoltaic Inverters With Reactive Power Capability. IEEE Transactions on Industrial Electronics 2017, 64, 6989 -6999.

AMA Style

Tan Kheng Suan Freddy, June-Hee Lee, Hyun-Cheol Moon, Kyo-Beum Lee, Nasrudin Abd Rahim. Modulation Technique for Single-Phase Transformerless Photovoltaic Inverters With Reactive Power Capability. IEEE Transactions on Industrial Electronics. 2017; 64 (9):6989-6999.

Chicago/Turabian Style

Tan Kheng Suan Freddy; June-Hee Lee; Hyun-Cheol Moon; Kyo-Beum Lee; Nasrudin Abd Rahim. 2017. "Modulation Technique for Single-Phase Transformerless Photovoltaic Inverters With Reactive Power Capability." IEEE Transactions on Industrial Electronics 64, no. 9: 6989-6999.

Journal article
Published: 27 December 2016 in Energies
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This paper proposes a balanced current control strategy for the current source rectifier (CSR) stage of an indirect matrix converter (IMC) under unbalanced grid voltage conditions. If the three-phase grid connected to the voltage source inverter (VSI) of the IMC has unbalanced voltage conditions, it affects the currents of the CSR stage and VSI stage, and the currents are distorted. Above all, the distorted currents of the CSR stage cause instability in the overall system, which can affect the life span of the system. Therefore, in this paper, a control strategy for balanced currents in the CSR stage is proposed. To achieve balanced currents in the CSR stage, the VSI stage should receive DC power without ripple components from the CSR stage. This is implemented by controlling the currents in the VSI stage. Therefore, the proposed control strategy decouples the positive and negative phase-sequence components existing in the unbalanced voltages and currents of the VSI stage. Using the proposed control strategy under unbalanced grid voltage conditions, the stability and life span of the overall system can be improved. The effectiveness of the proposed control strategy is verified by simulation and experimental results.

ACS Style

Yeongsu Bak; June-Seok Lee; Kyo-Beum Lee. Balanced Current Control Strategy for Current Source Rectifier Stage of Indirect Matrix Converter under Unbalanced Grid Voltage Conditions. Energies 2016, 10, 27 .

AMA Style

Yeongsu Bak, June-Seok Lee, Kyo-Beum Lee. Balanced Current Control Strategy for Current Source Rectifier Stage of Indirect Matrix Converter under Unbalanced Grid Voltage Conditions. Energies. 2016; 10 (1):27.

Chicago/Turabian Style

Yeongsu Bak; June-Seok Lee; Kyo-Beum Lee. 2016. "Balanced Current Control Strategy for Current Source Rectifier Stage of Indirect Matrix Converter under Unbalanced Grid Voltage Conditions." Energies 10, no. 1: 27.

Journal article
Published: 20 January 2015 in Journal of Power Electronics
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ACS Style

June-Hee Lee; Kyo-Beum Lee. Current Sensorless MPPT Control Method for Dual-Mode PV Module-Type Interleaved Flyback Inverters. Journal of Power Electronics 2015, 15, 54 -64.

AMA Style

June-Hee Lee, Kyo-Beum Lee. Current Sensorless MPPT Control Method for Dual-Mode PV Module-Type Interleaved Flyback Inverters. Journal of Power Electronics. 2015; 15 (1):54-64.

Chicago/Turabian Style

June-Hee Lee; Kyo-Beum Lee. 2015. "Current Sensorless MPPT Control Method for Dual-Mode PV Module-Type Interleaved Flyback Inverters." Journal of Power Electronics 15, no. 1: 54-64.

Journal article
Published: 02 January 2013 in Energies
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This paper proposes a variable DC-link reference voltage algorithm for wide range of maximum power point tracking (MPPT) for two-string photovoltaic (PV) systems. A multi-string system, which is a kind of PV system, is widely used due to its many merits (such as the ability to use low rating devices, high MPPT efficiency, and so forth). PV systems can choose their input voltages on the basis of their PV cell connection structure. The PV cell connection structure can be restricted because the input voltage and current affect the PV system design. This reduces the MPPT range under some weather conditions. In the restricted PV connection structure, this algorithm enlarges the MPPT range and minimizes the increment of the total harmonic distortion (THD) by selecting the appropriate DC-link voltage reference which is changed by comparing the sorted input voltage. To verify the proposed algorithm, simulation and experiments are conducted to show the results of the performance for the proposed algorithm.

ACS Style

June-Seok Lee; Kyo Beum Lee. Variable DC-Link Voltage Algorithm with a Wide Range of Maximum Power Point Tracking for a Two-String PV System. Energies 2013, 6, 58 -78.

AMA Style

June-Seok Lee, Kyo Beum Lee. Variable DC-Link Voltage Algorithm with a Wide Range of Maximum Power Point Tracking for a Two-String PV System. Energies. 2013; 6 (1):58-78.

Chicago/Turabian Style

June-Seok Lee; Kyo Beum Lee. 2013. "Variable DC-Link Voltage Algorithm with a Wide Range of Maximum Power Point Tracking for a Two-String PV System." Energies 6, no. 1: 58-78.