New MPPT Control Strategy for Two-Stage Grid-Connected Photovoltaic Power Conditioning System

Hyun-Su Bae; Joung-Hu Park; Bo-Hyung Cho; Gwon-Jong Yu

New MPPT Control Strategy for Two-Stage Grid-Connected Photovoltaic Power Conditioning System

Vol. 7, No. 2, pp. 174-180, Apr. 2007

10.6113/JPE.2007.7.2.174

solar array power system

two-stage photovoltaic grid-connected power conditioning system

maximum power point tracker

Digital control

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Abstract

In this paper, a simple control method for two-stage utility grid-connected photovoltaic power conditioning systems (PCS) is proposed. This approach enables maximum power point (MPP) tracking control with post-stage inverter current information instead of calculating solar array power, which significantly simplifies the controller and the sensor. Furthermore, there is no feedback loop in the pre-stage converter to control the solar array voltage or current because the MPP tracker drives the converter switch duty cycle. This simple PCS control strategy can reduce the cost and size, and can be utilized with a low cost digital processor. For verification of the proposed control strategy, a 2.5kW two-stage photovoltaic grid-connected PCS hardware which consists of a boost converter cascaded with a single-phase inverter was built and tested.

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Cite this article

[IEEE Style]

H. Bae, J. Park, B. Cho, G. Yu, "New MPPT Control Strategy for Two-Stage Grid-Connected Photovoltaic Power Conditioning System," Journal of Power Electronics, vol. 7, no. 2, pp. 174-180, 2007. DOI: 10.6113/JPE.2007.7.2.174.

[ACM Style]

Hyun-Su Bae, Joung-Hu Park, Bo-Hyung Cho, and Gwon-Jong Yu. 2007. New MPPT Control Strategy for Two-Stage Grid-Connected Photovoltaic Power Conditioning System. Journal of Power Electronics, 7, 2, (2007), 174-180. DOI: 10.6113/JPE.2007.7.2.174.