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Main Items of the Inverter:
① Main inverter enclosure
② Inverter wirebox
③ Inverter mounting bracket
④ Cooling fans
⑤ LED indicator lights
⑥ User LCD display
⑦ User Key buttons
⑧ DC switch: DC power on/off
⑨ AC switch: AC power on/off
2.6 Schematic Diagram and Circuit Design
The basic electrical schematic diagram of the CPS
SCA50/60KTL-DO/US-480、CPS SCA 25 KTL-DO/US-208 3-Phase String
Inverters are shown in Figure 2- 、Figure 2- and Figure 2-. The input from PV
source circuits passes through surge protection circuitry, DC EMI wave filters,
and independent DC-DC boost circuitry to achieve maximum power point
tracking and boost the voltages to a common DC bus. The inverter uses line
voltage and frequency measurements to synchronize to the grid and
converts the available PV energy to AC power by injecting balanced 3-phase
AC current into the electric utility grid. Any high frequency AC component is
removed by passing through a two-stage relay and EMI wave filter to
produce high quality AC power.
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