Standalone hybrid generation system for the remote area of Thar, Pakistan
three-phase. The output of the inverter is then connected to a low-pass filter to prevent high-frequency
harmonics injected into the AC system. A synthesized AC-output
voltage is produced by
appropriately controlling the switches and consists of a controlled series of positive and negative
pulses that correspond to the positive and negative half cycles of a sinusoid.
Fig. 2.31 Single-stage power electronics topologies with (a) Single-phase inverter; (b) Three-phase inverter
The most common two-stage topology for the BESS consists of a
DC-AC micro-grid-connected
voltage source PWM inverter with a bidirectional DC-DC converter. The DC-AC full-bridge inverter
controls the micro-grid current by means of pulse width modulation (PWM), known as a “bang-bang”
operation. A simple design for a two-stage power electronics topology, as shown in Figure 50,
incorporates a full-bridge DC-DC converter that can operate with any voltage and current polarity.
The voltage polarity and amplitude can be set irrespective of the current direction (Mohan et al.
2003).
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