أثر المولدات الريحية ذات التغذية المضاعفة في نظام القدرة الكهربائية في حالة الأعطال المتوازنة في شبكة النقل

الملخص EN

Today worldwide distributed generation (DG) takes a very important role in the operation of distributed electric power systems.

However, the existence of distributed generation may have impacts on different topics, such as fault currents, fault protection, coordination schemes or fault location.

If there is short-circuit in the system, the presence of one or more distributed generators can affect the fault current levels, the monitoring of voltages and currents at the substation.

The main supply generation will not have to inject as much power to the line because of the DG and, therefore, voltages and currents at the substation will be different from the ones that would be measured without DG .

In this paper, an analytical study of a network that consists of 9 knots and contains three generators, which are connected to the voltage level 230kV through step-up voltage transformers.

In addition, the mentioned network supplies different loads.

This study includes a simulation of the network using ETAP program, in the normal operation (power flow), and then some fault cases are simulated.

The impact of the faults on the network parameters, and the impact of adding a wind generator on one of the network bus-bars are studied.

The study focused on changing the fault current when we add the wind generator.

In addition, the paper shows the benefits that we can get from of adding the generator, e.g.

improvement of the main network voltages during the faults.

.

Finally, the effects of changing the rated power of the generator and the connection point on the network parameter were studied.