Characterization of series arcs in LVdc microgrids
This paper provides an empirical study on series arc behavior in low voltage dc microgrids. The response of an R-L-C dc microgrid abstraction towards series arcs is studied experimentally for varying grid inductance, dc voltages, load capacitances and load currents. In order to account for the stochastic nature of arcs, experiments are repeated multiple times under similar conditions to gain statistical significance. Thereby, insight on percentage occurrence and burn time of initiated series arcs is provided. Load side voltage response is studied to gain insight on the expected peak drop and fall time. This empirical evidence was judged to be a necessary requirement in developing a novel series arc extinguishing method from load side power electronic devices.
Series Arc fault studies and modeling for a DC distribution system
Electrical arcs are of great concern for power electronic systems. Modeling of arc faults to represent and predict arc characteristics and transient responses within the power system is now receiving considerable research attention. In this paper, a series DC arc fault demonstration rig is designed to generate series arcs by moving one electrode away from a stationary one with a stepper motor. Experimental results presented and analyzed to obtain the arc fault characteristics. The arc voltage, arc current and arc power can be predicted using the Zeller model within a wide range of supply voltage, load conditions and different test conditions, such as electrode material. The verification of this model is important as it can now be included in simulations of complex power systems to aid the development and testing of robust arc fault detection and location strategies.
Design guideline of DC distribution systems for home appliances: Issues and solution
In this paper, 5kW DC distribution system test-bed is designed to prove feasibility of DC distribution system and find problems and solutions when DC distribution is introduced. And availability of spark reduction method using initial charging circuit and arc reduction method using freewheeling diode is verified. In conclusion, we conduct empirical research applying simultaneous and actual load to DC distribution test-bed.