Bowtell, Les and Ahfock, Tony (2007) Comparison between unipolar and bipolar single phase grid-connected inverters for PV applications. In: AUPEC 2007: 17th Australasian Universities Power Engineering Conference, 9-12 Dec 2007, Perth, Australia.
An inverter is essential for the interfacing of photovoltaic panels with the AC network. There are many possible inverter topologies and inverter switching schemes and each one will have its own relative advantages and disadvantages. Efficiency and output current distortion are two important factors governing the choice of inverter system. In this paper, it is argued that current controlled inverters offer significant advantages from the point of view of minimisation of current distortion. Two inverter switching strategies are explored in detail. These are the unipolar current controlled inverter and the bipolar current controlled inverter. With respect to low frequency distortion, previously published works provide theoretical arguments in favour of bipolar switching. On the other hand it has also been argued that the unipolar switched inverter offers reduced switching losses and generates less EMI. On efficiency grounds, it appears that the unipolar switched inverter has an advantage. However, experimental results presented in this paper show that the level of low frequency current distortion in the unipolar switched inverter is such that it can only comply with Australian Standard 4777.2 above a minimum output current. On the other hand it is shown that at the same current levels bipolar switching results in reduced low frequency harmonics.
|Item Type:||Conference or Workshop Item (Commonwealth Reporting Category E) (Paper)|
|Additional Information:||No evidence of copyright restrictions.|
|Uncontrolled Keywords:||inverter switching; current controlled inverters|
|Subjects:||290000 Engineering and Technology|
|Depositing User:||Dr Tony Ahfock|
|Date Deposited:||17 Aug 2008 23:59|
|Last Modified:||02 Jul 2013 23:05|
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