Variable Structure PWM Controller for Highly Efficient PV Inverters

Seong-Jin Oh; Myoung-Ho Sunwoo

Variable Structure PWM Controller for Highly Efficient PV Inverters

Seong-Jin Oh

Myoung-Ho Sunwoo

Vol. 9, No. 6, pp. 866-873, Nov. 2009

10.6113/JPE.2009.9.6.866

PV PCS

Pulse width modulation

Harmonic loss

Switch loss

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Abstract

In general, the output voltage level of a PV array varies widely at various irradiances and temperatures. The MPP (Maximum Power Point) range of a medium- or high-power PV PCS is normally 450~830Vdc or 300~600Vdc. This means the PV PCS should operate in a wide range of modulation indexes. The PV PCS should satisfy the harmonic current requirement that the TDD (Total demand distortion) shall not exceed 5%. This paper proposes a new PWM control method for a medium- or high-power PV PCS which increases the efficiency of power conversion in all operation ranges with acceptable harmonic ripple currents. This paper compares and analyzes appropriate PWM schemes for the PV PCS in the view points of conversion efficiency and current harmonics.

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Cite this article

[IEEE Style]

S. Oh and M. Sunwoo, "Variable Structure PWM Controller for Highly Efficient PV Inverters," Journal of Power Electronics, vol. 9, no. 6, pp. 866-873, 2009. DOI: 10.6113/JPE.2009.9.6.866.

[ACM Style]

Seong-Jin Oh and Myoung-Ho Sunwoo. 2009. Variable Structure PWM Controller for Highly Efficient PV Inverters. Journal of Power Electronics, 9, 6, (2009), 866-873. DOI: 10.6113/JPE.2009.9.6.866.