Technical FAQs 4

Do inverter based generators cause overvoltage?

Inverter-based technology typically have lower fault currents and negative sequence currents to minimise overvoltage on the DC bus capacitors. Some inverter-based generators have a large negative sequence impedance, which can result in temporary over-voltages during unbalanced faults.

How do inverter-based technologies behave during power system faults?

Inverter-based technologies behaviour during power system faults is governed by their control logic and settings. While most inverters inject only positive-sequence current, some also inject negative-sequence current to better control the voltages on the AC side of the inverter.

Why do inverter-based generators have a negative sequence impedance?

Some inverter-based generators have a large negative sequence impedance, which can result in temporary over-voltages during unbalanced faults. Conventional synchronous machines typically have an inertia greater than 3 s, allowing for grid support during faults.

What is the difference between a rotation machine and an inverter?

Rotation machines produce large faults currents with a small negative-sequence impedance path. Inverter-based technology typically have lower fault currents and negative sequence currents to minimise overvoltage on the DC bus capacitors.

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