Minimization of the dc component in transformerless three phase grid-connected photovoltaic inverters
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The document discusses a proposed solution to minimize the DC component in transformerless three-phase grid-connected photovoltaic inverters, addressing challenges related to system operation and safety. A software-based 'virtual capacitor' approach is introduced, which effectively reduces DC current within the IEEE standard limits while also decreasing total harmonic distortion and voltage ripple. The method has been validated with a 10-kVA prototype, demonstrating its effectiveness under various grid conditions.
Minimization of the dc component in transformerless three phase grid-connected photovoltaic inverters
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- 2. DOCUMENT FORMAT • Abstract: • Introduction: • Literature Survey: • System Analysis: • Existing System: • Disadvantages: • Proposed System: • Advantages: • System Requirements: • Block Diagram: • Working Flow Diagram: • Circuit Diagram: • Implementation: • Modules Description: • System Study: • System Testing: • Software Description: • Sample code: • Conclusion: • Future Enhancement: • References: OUR OFFICES @ CHENNAI / TRICHY / KARUR / ERODE / MADURAI / SALEM / COIMBATORE /BANGALORE / HYDRABAD CELL: +91 99436 99916 / 99436 99926 / 99436 99936
- 3. MINIMIZATION OF THE DC COMPONENT IN TRANSFORMERLESS THREE-PHASE GRID- CONNECTED PHOTOVOLTAIC INVERTERS TITLE OUR OFFICES @ CHENNAI / TRICHY / KARUR / ERODE / MADURAI / SALEM / COIMBATORE /BANGALORE / HYDRABAD CELL: +91 99436 99916 / 99436 99926 / 99436 99936
- 4. ABSTRACT The dc component is a special issue in transformer less grid-connected photovoltaic (PV) inverter systems and may cause problems regarding system operation and safety. IEEE standard 1547-2003 has defined the limit for dc component in the grid-side ac currents, e.g., below 0.5% of the rated current. The dc component can cause line-frequency power ripple, dc-link voltage ripple, and a further second-order harmonic in the ac current. This paper has proposed an effective solution to minimize the dc component in three-phase ac currents and developed a software-based approach to mimic the blocking capacitors used for the dc component minimization, the so-called virtual capacitor. The “virtual capacitor” is achieved by adding an integral of the dc component in the current feedback path. A method for accurate extraction of the dc component based on double time integral, as a key to achieve the control, has been devised and approved effective even under grid- frequency variation and harmonic conditions. Aproportional integral- resonant controller is further designed to regulate the dc and line-frequency component in the current loop to provide precise control of the dc current. The proposed method has been validated on a 10-kVA experimental prototype, where the dc current has been effectively attenuated to be within 0.5% of the rated current. The total harmonic distortion and the second-order harmonic have also been reduced as well as the dc-link voltage ripple. OUR OFFICES @ CHENNAI / TRICHY / KARUR / ERODE / MADURAI / SALEM / COIMBATORE /BANGALORE / HYDRABAD CELL: +91 99436 99916 / 99436 99926 / 99436 99936
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