Combined SHE-LLCL Design for a Real Case Photovoltaic Power Station
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Combined SHE-LLCL Design for a Real Case Photovoltaic Power Station Rawia Chakroun1 · Ramzi Ben Ayed1 · Nabil Derbel1 Received: 22 February 2020 / Revised: 15 July 2020 / Accepted: 13 August 2020 © Brazilian Society for Automatics–SBA 2020
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. Keywords Photovoltaic power station · Three-phase inverter · Selective harmonic elimination · Selective harmonic modulation · LCL filter · LLCL filter · Harmonic current spectrum · Grid codes
List of Abbreviations SHE Selective harmonic elimination SHM Selective harmonic modulation PWM Pulse width modulation PV Photovoltaic SQP Sequential quadratic programming THD Total harmonic distortion List of Symbols Secondary winding resistance (Ω) R2Y 1 Secondary inductance (H) L 2Y 1 Tertiary resistance (Ω) R3Y 1 Tertiary inductance (H) L 3Y 1 Tertiary capacitance (H) C3Y 1
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Rawia Chakroun [email protected] Ramzi Ben Ayed [email protected] Nabil Derbel [email protected]
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Sfax Engineering School, University of Sfax, BP 1173, 3038 Sfax, Tunisia
R1Y 1 L 1Y 1 Rμ1 L μ1 Rgrid1 L grid1 ihn vh n HLCL HLLCL
Primary winding resistance (Ω) Primary inductance (H) Magnetic resistance (Ω) Magnetic inductance (H) Equivalent grid resistance (Ω) Equivalent grid inductance (H) Amplitude of the n-current harmonic Amplitude of the n-voltage harmonic Frequency response of the LCL filter Frequency response of the LLCL filter
1 Introduction Nowadays, a lot of works are focused on developing renewable energy as new alternative to fossil fuel because pollution reaches critical thresholds. Among renewable energy sources, photovoltaic energy is interesting as it is almost a maintenance-free system and then has low life cost compared to other alternatives. A typical photovoltaic system archi
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