When using the
active voltage regulation capability of PV, the maintenance cost and the loss of power should be taken into consideration:
Therefore, the
active voltage suppression circuits, which are capable to accumulate the voltage spike energy in reactive components, have to be applied [5], [6].
The six
active voltage vectors and one zero voltage vector are utilised in the general type of ZSI inverter.
This paper focuses on the design of self-biased active voltage doubler feed by a low frequency PE transducer, as it is easily available and provides high output efficiency.
The design of the proposed self-biased active voltage doubler is presented in Section 4.
Figure 4 shows the proposed self-biased active voltage doubler circuit.
The algorithm calculation time is divided in two or three switching periods with different active voltage vectors, thus forming higher number of available voltage vectors.
Furthermore, in classical DTC, inverter's switching elements do not change their state during the whole cycle thus defining zero or one out of six active voltage vectors.
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The resulting
active voltage sheet is characterized by a low impedance and high capacity to ground.