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ABSTRACT: The ac line current regulation strategy for the grid-connected photovoltaic (GCPV) system is proposed in this paper. The power flow of the GCPV system and the operational principles of different ac line current regulation strategies are presented. In this paper, the optimal ac line current regulation is defined to be able to achieve dc-link voltage regulation in one 60 Hz ac mains cycle while minimizing the injected ac line current variation. The mathematical equations for the proposed optimal ac line current regulation strategy are derived thoroughly. The derived equations also explain the behavior of the dc-link voltage responding to the power variation of the GCPV system. As a result, the selection criteria of the dc-link capacitor can be established. Hardware experimental results have been presented to verify the validity of the proposed optimal ac line current regulation strategy.
IEEE Transactions on Power Electronics 02/2010; · 4.65 Impact Factor
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ABSTRACT: The selection criteria of dc-link capacitor based on the optimal ac line current regulation strategy for the single-phase grid-connected photovoltaic (GCPV) system is proposed in this paper. The power flow of the GCPV system and the optimal ac line current regulation strategy are presented. The optimal ac line current regulation strategy can achieve dc-link voltage regulation in one ac mains cycle while minimizing the injected ac line current variation. The mathematical expression for the dc-link voltage variations and the number of ac mains cycle that the dc-link voltage stays inside the hysteresis band are derived thoroughly. The derived equations also explain the behavior of the dc-link voltage responding to the power variation of the single-phase GCPV system. As a result, the selection criteria of the dc-link capacitor can be established. Hardware experimental results have presented to verify the performance of the single-phase GCPV system.
Power Electronics and Drive Systems, 2009. PEDS 2009. International Conference on; 12/2009
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ABSTRACT: A novel DC bus regulation strategy for grid-connected PV power generation system is proposed in this paper. The power flow of the grid-connected PV power generation system is introduced first. The operational principles of different DC bus regulation strategies are presented. The mathematical equations for the current command adjustment of the injected AC line current are derived. The proposed DC bus regulation strategy can mitigate the AC line current variation, improve the power quality of AC mains, reduce the size of the DC-link capacitor, and increase the reliability of the grid-connected PV power generation system. Experimental results are presented to verify the performance of the proposed DC bus regulation strategy.
Sustainable Energy Technologies, 2008. ICSET 2008. IEEE International Conference on; 12/2008
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ABSTRACT: The objective of this paper is to propose an improved delta modulation (IDM) control scheme for DC-DC buck converters. The proposed IDM has various slope of carrier signal by feed forward the input control signal into the integrator of the delta modulator. It can overcome the drawback of the conventional delta modulation (CDM), which can not be applied to DC-DC converters. In this paper, the operation principle of the proposed IDM is introduced. The effect of the circuit parameter variation to the converter performance is presented, too. Finally, both the computer simulation and experimental results show that the proposed IDM control scheme can achieve very stable output voltages with fast transient response.
Sustainable Energy Technologies, 2008. ICSET 2008. IEEE International Conference on; 12/2008
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ABSTRACT: The objective of this paper is to propose an analysis approach to analyze the dynamic characteristics of the grid-connected PV power generation system. The grid-connected PV power generation system will be introduced first. The dynamic relationship between the power flow and the DC bus voltage will be analyzed. Mathematical equations for the DC bus voltage dynamic variations, which are based on the constant current adjustment control strategy, will be derived. Computer simulation results will be used to verify the validity of the proposed analysis technique. The proposed DC bus voltage regulation method can reduce the size of the DC bus capacitor, improve the power quality of AC mains and increase the reliability of the PV power generation system.
Industrial Technology, 2008. ICIT 2008. IEEE International Conference on; 05/2008
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ABSTRACT: An improved delta modulation (IDM) controller for pulse width modulation (PWM) inverter is presented in this paper. The proposed IDM use the input reference signal to generate the variable integrating slope for the integrator in order to obtain better control ability. The proposed IDM can increase the modulation gain of the fundamental component, reduce the total harmonic distortion, expand the duty ratio variation range, and achieve fast response. In this paper, operation principle of the proposed IDM as well as the derivation of mathematical equations will be presented. Then, computer simulations with different operation conditions will be used to verify the validity of the proposed IDM with different. Finally, hardware measurement results will be presented to confirm the performance of the proposed IDM.
Industrial Technology, 2008. ICIT 2008. IEEE International Conference on; 05/2008
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ABSTRACT: The objective of this paper is to propose a new method to detect the rise of equivalent series resistor in order to realize the online failure prediction of the electrolytic capacitor for LC filter of switching-mode power converter. Characteristics of electrolytic capacitors are introduced in this paper. Different experimental measurements are conducted and shown to illustrate the properties of electrolytic capacitors. The proposed online failure prediction method has the merits of low cost and circuit simplicity. It can be integrated within the package of the electrolytic capacitor to improve its reliability. Hardware experimental results are shown to verify the performance of the proposed method.
IEEE Transactions on Industrial Electronics 02/2008; · 5.16 Impact Factor
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ABSTRACT: The objective of this paper is to propose an improved sigma-delta (Sigma-Delta) modulation full-bridge inverter to drive the piezoelectric actuator for the vibration suppression system. The improved Sigma-Delta modulation strategy has the merit of circuit simplicity. Computer simulations and hardware experimental results are presented to verify the feasibility of the proposed Sigma-Delta modulation. A 200 W prototype full-bridge inverter with the proposed Sigma-Delta modulation is built to drive the piezoelectric actuator for the vibration suppression system. Measured waveforms of the acceleration sensors show that the vibration of the platform can be reduced significant.
Industrial Electronics Society, 2007. IECON 2007. 33rd Annual Conference of the IEEE; 12/2007
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ABSTRACT: This paper proposes a new control strategy for the half-bridge inverter with a compensation circuit to compensate the output voltage distortion caused by the voltage unbalance of the series connected input capacitors. It can extend the operation range of the half-bridge inverter without sacrificing the output power quality. The compensation circuit is activated only when the output voltage distortion occurs. The operation principle and control flowchart of the proposed compensation strategy are introduced. Hardware experimental results with different operation conditions are presented to verify the validity of the proposed compensation strategy.
Power Electronics and Applications, 2007 European Conference on; 10/2007
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ABSTRACT: The objective of this paper is to propose an improved dc bus voltage regulation strategy for the grid-connected PV/Wind power generation system. The proposed dc bus voltage regulation strategy can reduce the variation of the dc bus voltage and the size of the dc bus capacitor bank, significantly. Also, the change of the injected ac current amplitude will be moderate and the power quality of the utility can be improved. A 1.2 kW prototype system is built and tested to verify the feasibility of the proposed dc bus voltage regulation strategy. Hardware experimental results are shown to confirm the performance of the proposed dc bus voltage regulation strategy.
Applied Power Electronics Conference and Exposition, 2006. APEC '06. Twenty-First Annual IEEE; 04/2006
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ABSTRACT: The objective of this paper is to propose a new method to detect the rise of equivalent series resistor (ESR) in order to realize the on-line failure prediction of the electrolytic capacitor for LC filter of switching-mode power converter. Characteristics of electrolytic capacitors are introduced in this paper. Different experimental measurements are conducted and shown to illustrate the properties of electrolytic capacitors. The proposed on-line failure prediction method has the merits of low cost and circuit simplicity. Hardware experimental results are shown to verify the performance of the proposed method.
Industry Applications Conference, 2005. Fourtieth IAS Annual Meeting. Conference Record of the 2005; 11/2005
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ABSTRACT: This paper presents the calculation of the optimum installation angle for the fixed solar-cell panels based on the genetic algorithm (GA) and the simulated-annealing (SA) method. The output power of the solar-cell panel is highly affected by the sunlight incident angle and its efficiency can be improved if the solar-cell panel is properly installed with the optimum angle. The relationship between the sunlight incident angle and the sunlight radiation intensity on the solar-cell panel surface is also presented in this paper. Both GA and SA with climatic data are utilized to calculate the optimum installation angle of the solar-cell panel for different locations in Taiwan. The best monthly and annual installation angles obtained by computer simulations are presented. Hardware experimental results indicate that the actual best monthly installation angles are very close to the computer simulation results.
IEEE Transactions on Energy Conversion 07/2005; · 2.27 Impact Factor
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ABSTRACT: The output power of the solar cell panel is highly affected by the sunlight incident angle. The efficiency can be improved if the solar cell panel is properly installed with the optimum angle. The relationship between the sunlight incident angle and the sunlight radiation intensity on the solar cell panel surface is presented in this paper. Genetic algorithms with climatic date are used to find out the optimum installation angle of the solar cell panel for different locations in Taiwan. The best monthly and annual installation angles obtained by computer simulations are presented. Hardware experimental results indicate that the actual best monthly installation angles are very close to the computer simulation results. A database information inquiry system based on the computer simulation results is developed by using the computer language C<sup>++</sup> Builder. It can provide the sufficient installation information for both the stand-alone and grid-connected photovoltaic power generation systems.
Power Electronics and Drive Systems, 2001. Proceedings., 2001 4th IEEE International Conference on; 11/2001
