H. Hinz (Advisor: P. Mutschler )
Status: finished by PhD Thesis in 2000
In order to feed the electric energy generated by photovoltaic systems to the low voltage (230 Vac) distribution network, it is necessary to convert the energy from DC to single-phase or three-phase AC. Up to a system size of 5kW, single-phase infeed is preferved. For this power class, a single-phase three level inverter without transformer is developed, which is characterized by a high efficiency especially in partial load conditions and by low system perturbation.
Available only in German:
H. Hinz: “Spannungseinprägender, einphasiger Dreipunkt-Wechselrichter für den transformatorlosen Netzparallelbetrieb von Photovoltaik-Anlagen” (opens in new tab)
Darmstädter Dissertation, 2000 (Zusammenfassung)
H. Hinz, P. Mutschler: “Voltage source inverters for grid connected photovoltaic systems” (opens in new tab)
2nd World Conference and Exhibition on Photovoltaic Solar Energy Conversion, Wien, Juli 1998, Seite 2045-2048
H. Hinz, P. Mutschler, M. Calais: “Control of a single phase three level voltage source inverter for grid connected photovoltaic systems” (opens in new tab)
PCIM '98, Nürnberg, Mai 1998, Seite 599-606
H. Hinz: “How to choose switching frequency and filter-elements for a maximum effeciency photovoltaic inverter”
PCIM '97, Nürnberg, Juni 1997, Seite 429-438
H. Hinz, P. Mutschler: “Single phase voltage source inverters without transformer in photovoltaic applications”.
PEMC '96, Budapest, September 1996, Seite 3/161-3/165
Three-phase current source inverter without transformer for grid connected photovoltaic systems
M. Meinhardt (Advisor: P. Mutschler )
Status: finished by PhD Thesis in 1997
To connect photovoltaic systems to the power grid, power inverters are needed which should have a high efficiency especially in partial load operation. Additionally, low system perturbations are also required. The advantages of inverter concepts without transformer are not only an increase in efficiency, but also a reduction of cost and size. The current source inverter seems to be especially appropriate in the medium power range. Therefore, this research project focuses on this type of inverter. The research is carried out by simulation as well as with a hardware realisation.
Mutschler, P.; Meinhardt, M.: Competive hysteresis controllers – a control concept for inverters having oscillating DC- and AC-side state variables (opens in new tab)
IEE Proc. Electr. Power Appl. Vol. 145, No. 06.November 1998
Meinhardt, M.¸Mutschler, P.: “Inverters without transformer in grid connected photovoltaic applications” (opens in new tab)
Proceedings of 6th European Conference on Power Electronics and Application (EPE ´95), Vol. 3, Sevilla, September 1995, S. 3.086 – 3.091
Mutschler,P: “ Wechselrichter für Photovoltaikanlagen” (opens in new tab)
Ringvorlesung Regenerative Energien im Sommer-Semester 1994
HEAG Hess. Elektrizitäts AG, Energie-Verlag Heidelberg. S. 35 – 53
Further publications on the subject of inverters for photovoltaic systems (available only in German):
- Meinhardt, M, Knaup, P: “Aufbau eines Solargenerator -Hardware-Modells für den Test photovoltaischer Systemkomponenten basierend auf der Untersuchung des dynamischen Betriebsverhaltens von Solargeneratoren im realen Betrieb”
11. Symposium Photovoltaische Solarenergie , Ostbayerisches Technologie Transfer Institut (OTTI) Kloster Banz , Staffelstein 13. – 15. 3. 1996 , S.446- 450 - Meinhardt, M.: Transformatorloser, stromeinpraegender Wechselrichter mit neuem Regelungskonzept
Sonnenenergie (magazine), No. 6, 1996, S. 39 – 42 - Meinhardt, M: “Grenzwerte und Verfahren zur Beurteilung von leitungsgebundenen Störaussendungen bei Netzkopplung von Photovoltaik – Anlagen”
11. Symposium Photovoltaische Solarenergie , Ostbayerisches Technologie Transfer Institut (OTTI) Kloster Banz , Staffelstein 13. – 15. 3. 1996 , S.594- 598 - Mutschler, P.; Meinhardt, M: “Transformatorlose Wechselrichter für Photovoltaik-Analgen”
10. Symposium Photovoltaische Solarenergie , Ostbayerisches Technologie Transfer Institut (OTTI) Kloster Banz, Staffelstein 15. – 17. 3. 1995 , S.495 – 499
