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Low-cost current-source 1-ph photovoltaic grid-connected inverter

Başlık çevirisi mevcut değil.

  1. Tez No: 400229
  2. Yazar: GÜRHAN ERTAŞGIN
  3. Danışmanlar: DOÇ. DR. NESİMİ ERTUĞRUL, DR. WEN L. SOONG
  4. Tez Türü: Doktora
  5. Konular: Elektrik ve Elektronik Mühendisliği, Electrical and Electronics Engineering
  6. Anahtar Kelimeler: Belirtilmemiş.
  7. Yıl: 2010
  8. Dil: İngilizce
  9. Üniversite: The University of Adelaide
  10. Enstitü: Yurtdışı Enstitü
  11. Ana Bilim Dalı: Elektrik ve Elektronik Mühendisliği Ana Bilim Dalı
  12. Bilim Dalı: Belirtilmemiş.
  13. Sayfa Sayısı: 177

Özet

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Özet (Çeviri)

This research investigates a complete analysis and investigation of a single-phase currentsource(CSI) grid-connected inverter topology that is based on a photovoltaic arrayas a supply and a DC link inductor acting as a constant-current source. The proposedlow-cost system is implemented using an open-loop control to prove the concept. Then awell-known feedforward compensation control is implemented to achieve acceptable totalharmonic distortion of the inverter output current. A single boost switch (based on aswitched-mode rectier) has a duty-cycle that is modulated sinusoidally at the mains(grid) frequency such that it produces an output current that appears a full-wave recti-ed sinewave that is synchronised to the grid voltage. Additionally, a H-bridge invertercircuit and a capacitive-inductive low-pass grid lter is used to unfold, lter and feed thesinusoidal output current into the grid.A number of detailed PV array models are studied and used in the simulations. The relationshipbetween the PV array output ripple and the DC link energy storage (element)for single-phase grid-connected inverters is analysed. The \balanced" ripple denition isintroduced to estimate the PV array output power reduction due to ripple.The proposed grid-connected CSI topology is idealised which ignores : component losses,voltage drops, PWM switching and low-pass output lter resonance eects. Normalisedsimulations are carried out to investigate DC link energy storage, modulation index andirradiance variation eects with an emphasis on meeting the power factor (PF) and totalharmonic distortion (THD) grid requirements.The low-pass grid lter optimisation for the proposed topology is studied showing a tradeobetween the output current THD, power loss, and quality factor. A 160 W inverter isimplemented and a set of comprehensive test results obtained to verify the simulationsusing open-loop and feedforward compensation control. To conclude, a 1.2 kW gridconnectedinverter based on the proposed low-cost topology was designed and simulated.Its simulated eciency of 95% was higher than that of the 160 W inverter.

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