New Control Strategy for 2-stage Utility-Connected Photovoltaic Power Conditioning System with a low cost digital processor

Bae, Hyunsu; Park, J.H.; Cho, B.H.; Yu, Gwon-Jong

doi:10.1109/pesc.2005.1582049

Cited by 26 publications

(19 citation statements)

References 11 publications

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“…To evaluate the previously mentioned topologies, the considered power range is from 230 W to 3220 W, which corresponds to 14 SW230 cells in series. According to Appendix I and formulas (11) and (12), the value of the decoupling capacitors C PV can be obtained.…”

Section: Losses and Efficiency Comparative Analysis Of The Convementioning

confidence: 99%

“…In terms of the wide input voltage from a photovoltaic array (PVA), the boost-full-bridge (BFB) topologies are adopted to improve the dc voltage utilization [11]- [14]. The boost stage is adopted to adjust a variable input voltage to a stable dc-link voltage for the inverter stage, which is generally responsible for converting the dc-link energy to the ac side and connecting to a grid system.…”

Section: Introductionmentioning

confidence: 99%

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A High Efficiency Two-stage Inverter for Photovoltaic Grid-connected Generation Systems

Liu¹,

Song²,

Shen³

2017

Journal of Power Electronics

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Conventional boost-full-bridge and boost-hybrid-bridge two-stage inverters are widely applied in order to adapt to the wide dc input voltage range of photovoltaic arrays. However, the efficiency of the conventional topology is not fully optimized because additional switching losses are generated in the voltage conversion so that the input voltage rises and then falls. Moreover, the electrolytic capacitors in a dc-link lead to a larger volume combined with increases in both weight and cost. This paper proposes a higher efficiency inverter with time-sharing synchronous modulation. The energy transmission paths, wheeling branches and switching losses for the high-frequency switches are optimized so that the overall efficiency is greatly improved. In this paper, a contrastive analysis of the component losses for the conventional and proposed inverter topologies is carried out in MATLAB. Finally, the high-efficiency under different switching frequencies and different input voltages is verified by a 3 kW prototype.

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Section: Losses and Efficiency Comparative Analysis Of The Convementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A High Efficiency Two-stage Inverter for Photovoltaic Grid-connected Generation Systems

Liu¹,

Song²,

Shen³

2017

Journal of Power Electronics

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“…For the MPPT of a PV module, various MPPT techniques have been developed [11]- [13]. Among them, the modified incremental conductance method [13] is employed for the MPPT of the proposed PCS.…”

Section: B Maximum Power Point Tracking Controllermentioning

confidence: 99%

High-Efficiency Power Conditioning System for Grid-Connected Photovoltaic Modules

Choi¹,

Choi²

2011

Journal of Power Electronics

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This paper presents a high-efficiency power conditioning system (PCS) for grid-connected photovoltaic (PV) modules. The proposed PCS consists of a step-up DC-DC converter and a single-phase DC-AC inverter for the grid-connected PV modules. A soft-switching step-up DC-DC converter is proposed to generate a high DC-link voltage from the low PV module voltage with a high-efficiency. A DC-link voltage controller is presented for constant DC-link voltage regulation. A half-bridge inverter is used for the single-phase DC-AC inverter for grid connection. A grid current controller is suggested to supply PV electrical power to the power grid with a unity power factor. Experimental results are obtained from a 180 W grid-connected PV module system using the proposed PCS. The proposed PCS achieves a high power efficiency of 93.0 % with an unity power factor for a 60 Hz / 120 Vrms AC power grid.

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“…1(b)) consisting of DC-DC boost converter and DC-AC inverter can enlarge the MPPT operation range for PV grid-connected system. Using a DC-DC boost converter in front, the efficiency of whole inverter system would decrease since more passive and active components (IGBT, capacitor, inductor, diode) are involved in the energy processing when compared to the single-stage topology but when considering the improved MPPT efficiency and wide operation range the two-stage solution is superior to the single-stage inverter [5,6].…”

Section: Introductionmentioning

confidence: 99%

Fault Diagnosis and Fault-Tolerant Control of DC-link Voltage Sensor for Two-stage Three-Phase Grid-Connected PV Inverters

Kim

Lee

et al. 2013

Journal of Electrical Engineering and Technology

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-This paper proposes a method for fault diagnosis and fault-tolerant control of DC-link voltage sensor for two-stage three-phase grid-connected PV inverters. Generally, the front-end DC-DC boost converter tracks the maximum power point (MPP) of PV array and the rear-end DC-AC inverter is used to generate a sinusoidal output current and keep the DC-link voltage constant. In this system, a sensor is essential for power conversion. A sensor fault is detected when there is an error between the sensed and estimated values, which are obtained from a DC-link voltage sensorless algorithm. Faulttolerant control is achieved by using the estimated values. A deadbeat current controller is used to meet the dynamic characteristic of the proposed algorithm. The proposed algorithm is validated by simulation and experiment results.

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New Control Strategy for 2-stage Utility-Connected Photovoltaic Power Conditioning System with a low cost digital processor

Cited by 26 publications

References 11 publications

A High Efficiency Two-stage Inverter for Photovoltaic Grid-connected Generation Systems

A High Efficiency Two-stage Inverter for Photovoltaic Grid-connected Generation Systems

High-Efficiency Power Conditioning System for Grid-Connected Photovoltaic Modules

Fault Diagnosis and Fault-Tolerant Control of DC-link Voltage Sensor for Two-stage Three-Phase Grid-Connected PV Inverters

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