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Combined SHE-LLCL Design for a Real Case Photovoltaic Power Station

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Abstract

The purpose of this study is to improve control performances of a real case photovoltaic (PV) power station. By considering the cable’s inductance, the LCL filter becomes an LLCL filter with a resonant behavior. To avoid this resonance from contaminating the system and to ensure that the studied case could be realized in the worldwide, a control design is highly required. This is achieved through two PWM strategies: the selective harmonic elimination (SHE) and the selective harmonic modulation (SHM). A brief comparison is highlighted in this paper. The obtained results confirm that SHE strategy presents really a harmful disadvantage compared to SHM (Franquelo et al. in IEEE Transactions on Industrial Electronics 54(6):3022–3029, 2007, Napoles et al. in IEEE Transactions on Industrial Electronics 57(7):2315–2323, 2010), which could impact the current harmonics rejected on the grid and breaks grid codes. An attention has to be paid to the unwanted effect of the SHE strategy as well as the LLCL poor quality attenuation. An efficient combined SHE-LLCL strategy is proposed to improve the performance of a real case grid-connected PV inverter thanks to the flexibility provided by the LLCL filter and the SHE strategy’s simplicity. Obtained results show better performances over traditional researches.

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Abbreviations

SHE:

Selective harmonic elimination

SHM:

Selective harmonic modulation

PWM:

Pulse width modulation

PV:

Photovoltaic

SQP:

Sequential quadratic programming

THD:

Total harmonic distortion

\(R_{2Y1}\) :

Secondary winding resistance (\(\varOmega \))

\(L_{2Y1}\) :

Secondary inductance (H)

\(R_{3Y1}\) :

Tertiary resistance (\(\varOmega \))

\(L_{3Y1}\) :

Tertiary inductance (H)

\(C_{3Y1}\) :

Tertiary capacitance (H)

\(R_{1Y1}\) :

Primary winding resistance (\(\varOmega \))

\(L_{1Y1}\) :

Primary inductance (H)

\(R_{\mu 1}\) :

Magnetic resistance (\(\varOmega \))

\(L_{\mu 1}\) :

Magnetic inductance (H)

\(R_{\mathrm{grid}1}\) :

Equivalent grid resistance (\(\varOmega \))

\(L_{\mathrm{grid}1}\) :

Equivalent grid inductance (H)

\(i_{h_{n}}\) :

Amplitude of the n-current harmonic

\(v_{h_{n}}\) :

Amplitude of the n-voltage harmonic

\(H_{\mathrm{LCL}}\) :

Frequency response of the LCL filter

\(H_{\mathrm{LLCL}}\) :

Frequency response of the LLCL filter

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Authors and Affiliations

  1. Sfax Engineering School, University of Sfax, BP 1173, 3038, Sfax, Tunisia

    Rawia Chakroun, Ramzi Ben Ayed & Nabil Derbel

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  1. Rawia Chakroun
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  2. Ramzi Ben Ayed
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  3. Nabil Derbel
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Correspondence to Rawia Chakroun.

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Chakroun, R., Ayed, R.B. & Derbel, N. Combined SHE-LLCL Design for a Real Case Photovoltaic Power Station. J Control Autom Electr Syst 31, 1558–1566 (2020). https://doi.org/10.1007/s40313-020-00634-4

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  • DOI: https://doi.org/10.1007/s40313-020-00634-4

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