GE AC Instalation and operation manual V10.docx
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Isolation transformer: a 50/60Hz isolation transformer can be provided optionally in
order to isolate the output phases. In this case, an isolation monitor can be integrated
in the power supply to detect isolation faults too.
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Input protections: these protections include a thermal-magnetic circuit breaker and
fuses. The connection of the power supply input with the grid is done by screw
terminals. Please follow safety instructions in
Installation
section to connect the grid
emulator.
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Input EMI filter: an electromagnetic filter is integrated to fulfil electromagnetic
compatibility regulations. The structure of the filter in question is the same as the one
of the output EMI filter.
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Input LCL filter: the purpose of this filter is to reduce the current distortion at
frequencies equal to or higher than switching frequency and thus reduce THD.
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Active Rectifier: a three-branch IGBT active front end is integrated in the equipment to
consume/inject a sinusoidal current from/to the grid.
The DC link voltage is set to 860V providing a regulation margin for fast transients at the
output of the grid emulator.
The active rectifier has bidirectional power flow capability and the injected reactive
power (grid side) can be defined by the customer.
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DC/AC output power supply: it is a three-branch IGBT converter. Its topology is the three
phase inverter and allows the conversion from the DC bus to each of the output AC
phases.
Each phase is controlled independently.
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Output LC filter: the filter in question reduces voltage distortion (caused by switching)
at the output of the grid emulator.
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Output protections: a disconnector is provided to isolate the output from the EUT. Screw
terminals are also integrated to connect the EUT. Please, follow safety instructions in
Installation
section to connect them.
Principle of operation
Below, a technical diagram of the power supply is shown:
