| Abstract |
Distributed (renewable) energy sources and a growing amount of loads are connected to the grid via (switched) power electronics. To investigate the grid-integration of these devices, a test bench was built up, which offers the possibility to vary the impedance and the voltage (in amplitude, waveform and frequency) at the PCC during operation. For this purpose, the test bench includes a transformer-based Grid Voltage Emulator, a Grid Impedance Emulator as well as a 4Q-AC-Source. Due to the increasing use of power electronics, the grid tends to behave capacitively in some load cases. To cover this topic as well, the test stand also includes a binary graded capacitor bank to emulate volatile capacitive loads.The design, realization and operation of the respective components is described in this paper. In addition, various experimental results regarding the grid voltage and impedance emulator are presented focusing e.g. on the current commutation of highly inductive loads. Furthermore, measurements of different devices under test, like an impedance analyzer or an active resonance damper, are shown. |
