Photovoltaic system using buck‐boost PWM power inverter

Nagao, Michihiko; Horikawa, Hideo; Harada, K.

doi:10.1002/eej.4391150512

Cited by 8 publications

(3 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, it is proposed to use a buck-boost-type inverter driven in discontinuous current mode (DCM) [9], which is a kind of power inverter. The power inverter consists of two functional blocks.…”

Section: Buck-boost Invertersmentioning

confidence: 99%

Maximum power point tracking with estimation of the capacitance of the capacitor connected to photovoltaic array

Kasa¹,

Iida²,

Majumdar³

2003

Electrical Engineering Japan

View full text Add to dashboard Cite

SUMMARYThis paper presents a new perturbation and observation method with a capacitance estimation technique for maximum power point tracking (MPPT) in a photovoltaic system. Usually, the maximum power point is tracked by increasing or decreasing the duty ratio of power switching devices. However, it is well known that actual capacitance of an electrolytic capacitor in parallel with a photovoltaic array has 50% tolerance of its nominal value and also that its capacitance value degrades as time passes. If the variation of the duty ratio is determined and fixed using the capacitor nominal value, the MPPT performance may be degraded. Therefore, we must use the actual capacitance in order to improve the MPPT performance. In our system, we applied the model reference adaptive system (MRAS), then obtained the accurate capacitance value and accordingly corrected the duty ratio variation. As a result, it was possible to obtain high MPPT performance. Experimental results show that the proposed method can stably track the maximum power point at widely changing capacitance values by using a newly developed buck-boost chopper-type power inverter.

show abstract

Section: Buck-boost Invertersmentioning

confidence: 99%

Maximum power point tracking with estimation of the capacitance of the capacitor connected to photovoltaic array

Kasa¹,

Iida²,

Majumdar³

2003

Electrical Engineering Japan

View full text Add to dashboard Cite

show abstract

“…The electricity generated by solar energy systems is a vital source of sustainable energy that emits almost no ozone-depleting substances and does not consume any non-renewable energy sources [27]. Matrix linked sustainable power source assets, for the most part, have space needs as they are connected to the structure via lengthy transmission networks distant from load centres [28]. Work on the PV system supports the 3 stage inverter linked to the system for a smooth prolonged operation and for the most reliable electric power structure.…”

Section: Introductionmentioning

confidence: 99%

Minimum Harmonic Distortion Losses and Power Quality Improvement of Grid Integration Photovoltaic-Wind Based Smart Grid Utilizing MOPSO

El-Gammal

Ramlal

2021

EJENERGY

View full text Add to dashboard Cite

Increased usage of combined PV-Wind renewable energy sources is seen as a positive step toward reducing air pollution and carbon emissions. However, since non-linear loads have increased dramatically, voltage quality and harmonic distortion concerns have arisen, affecting the operation of combined PV-Wind RES and smart-grid electrical transmission structures. This study shows how a Shunt active power filter may improve energy quality in a microgrid structure at the distribution level. The major goal of this article is to find an appropriate controller approach for improving the shunt active power filter's compensating capacity. This paper simulates a PV-Wind hybrid renewable energy system that operates in the presence of unpredictably variable solar and wind energy resources. The objective is to allow the construction of an electrical control structure that produces the right duty cycle. It will aid in the regulation and stabilization of voltages at dc/dc energy conversion plant. Simulation is used to assess the proposed control system's ability to enhance power quality. The device's compensating capability is mostly determined by the DC link capacitor voltage control. The closed loop functioning of a proportional integral controller is used to attain this voltage regulation in the past. To increase the functioning of a shunt active power filter, the MOPSO procedure approach has been presented. The performance of suggested approaches and the comparison of different pulse generating strategies have been validated in the SIMULINK/MATLAB model environment. The suggested technology successfully improves power quality on the grid and maintains a steady voltage on the grid despite variations in RE output and load.

show abstract

“…The authors have also presented a novel AC module system which enhances the power decoupling (7) . The feature of this system is that a flyback-type inverter (8) is used and this enables AC current sharing among parallel connected inverters without current feedback control. However, above system has a serious drawback that the conversion efficiency is not high enough that we have expected because of its modulation method, the Sequential Magnetizing Modulation (SMM) method.…”

Section: Introductionmentioning

confidence: 99%

Discussion on Modulation Methods for Flyback-type Single-Phase Inverters with Enhanced Power Decoupling for Photovoltaic AC Module Systems

Hirao

Shimizu

Ishikawa³

et al. 2006

IEEJ Trans. IA

View full text Add to dashboard Cite

Numerous number of photovoltaic (PV) power generation systems have been expected to be installed on the private residences. In order to make PV power generation systems ease to install, a concept of photovoltaic AC module system has been proposed. An AC module consists of a PV panel and a small power grid interactive inverter on it. The AC module inverters are required to be installed on a roof at high temperature condition. Hence, electrolytic capacitors, which provide large capacitance, can not be used on the input DC-bus line because the lifetimes of electrolytic capacitors are short at high temperature condition. In the case when a film capacitor, which has a long lifetime at high temperature condition, is used as the DC-bus input capacitor, its small electrostatic capacitance causes low frequency voltage pulsation on the DC input bus line and results in the difficulty of Maximum Power Point Tracking (MPPT) control of the PV module. Hence, it is necessary to decouple the pulsating power from input DC-bus line. Several papers have presented power decoupling topologies of grid interactive inverters for small distributed power generators. The authors have presented a novel AC module system which enhances the power decoupling. The feature of this system is that a flyback-type inverter is used and this enables AC current sharing among parallel connected inverters without current feedback control. However, above system has a serious drawback that the conversion efficiency is not high enough as expected because of its modulation method, the Sequential Magnetizing Modulation (SMM) method. Then this paper focuses on the modulation method, and proposes a novel modulation method, the Time-shared Magnetizing Modulation (TMM) method, in order to realize the power decoupling in the flyback inverter as well as high efficiency conversion. Figure 1 shows the main circuit configuration of the flyback inverter on the TMM method for the power decoupling, and the operation waveforms is depicted in Fig. 2. Since the decoupling capacitor, C X , deals only on the pulsating power, and C X supplies the pulsating power, then pure DC current flows from the PV module to DCbus line on the inverter. The DC-bus supplies the constant current and the surplus/lack of the magnetizing current is transferred to the Since the pulse width of output current, i 2 , on this method is wider than that on the SMM method, under the same switching frequency condition, the effective value of the magnetizing current can be reduced. Hence, it is possible to increase the conversion efficiency.The experimental results verify that the TMM method has advantage with respect to the conversion efficiency. This paper concludes that the flyback inverter on the TMM method for power decoupling is the most suitable for a single-phase grid interactive inverter for the AC module system because of its high efficiency operation.- MemberA photovoltaic AC module system has been expected to be installed on the private residences. The AC module inverter needs an active power d...

show abstract

Photovoltaic system using buck‐boost PWM power inverter

Cited by 8 publications

References 1 publication

Maximum power point tracking with estimation of the capacitance of the capacitor connected to photovoltaic array

Maximum power point tracking with estimation of the capacitance of the capacitor connected to photovoltaic array

Minimum Harmonic Distortion Losses and Power Quality Improvement of Grid Integration Photovoltaic-Wind Based Smart Grid Utilizing MOPSO

Discussion on Modulation Methods for Flyback-type Single-Phase Inverters with Enhanced Power Decoupling for Photovoltaic AC Module Systems

Contact Info

Product

Resources

About