10 research outputs found
Analytical derivation of PSS parameters for generator with static excitation system
This paper presents a methodology for PSS design which results in a PSS producing a nearly pure damping torque component in a wide frequency range. The derivation is based on the Heffron-Phillips single-machine infinite-busbar model and for a generator with static exciter and speed-based PSS. The choice of time constants is very simple and the only parameter still to be optimized is the PSS gain. Effectiveness of the PSS has been confirmed by tests conducted on single- and multi-machine power system model
Improving sensitivity of residual current transformers to high frequency earth fault currents
For protection against electric shock in low voltage systems residual current
devices are commonly used. However, their proper operation can be interfered when high
frequency earth fault current occurs. Serious hazard of electrocution exists then. In order
to detect such a current, it is necessary to modify parameters of residual current devices,
especially the operating point of their current transformer. The authors proposed the modification
in the structure of residual current devices. This modification improves sensitivity
of residual current devices when high frequency earth fault current occurs. The test
of the modified residual current device proved that the authors’ proposition is appropriate