Chapter 8Cable Transient in Distributed Generation System
Naoto Nagaoka
Graduate School of Electrical Engineering, Doshisha University, Kyoto, Japan
Some examples of transient simulations of cable systems in distributed generation systems by means of the electromagnetic transients program (EMTP) [1] will be given in this chapter.
8.1 Transient Simulation of Wind Farm
8.1.1 Circuit Diagram
Figure 8.1 illustrates a model circuit of a wind farm. Each feeder involves five wind generators. The generator of capacity 3 MW and its step-up transformer are assumed to be disconnected to focus on the transient characteristic of the cable system in the simulation. Each feeder is connected to a 22 kV bus in Substation L (s/s L). The buses have a bus-tie circuit breaker (CB) (SWC). The capacity of each transformer installed in Substation L is . When the bus-tie CB is closed, the condition is identical to that where the feeders are connected to the 66 kV bus via a single transformer of capacity 36 MVA. The wind farm is connected with a grid at Substation K (s/s K). The backward impedance of the grid is represented by an RL series circuit. Node names used in the EMTP simulation are composed of the characters in dashed boxes in Figure 8.1 followed by a character indicating phase-A, B, or C.
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. When the bus-tie CB is closed, the condition is identical to that where the feeders are connected to the 66 kV bus via a single transformer of capacity 36 MVA. The wind farm is connected with a grid at Substation K (s/s K). The backward impedance of the grid is represented by an RL series circuit. Node names used in the EMTP simulation are composed of the characters in dashed boxes in Figure 8.1 followed by a character indicating phase-A, B, or C.