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In real power system situations of uneven loading of supply lines included in the section, forming connection between the source and the power system or separate dedicated load node, often occur. In such situations one of power transmission lines (PTL) will be loaded below the nominal installed capacity, while the other parallel communication line will be overloaded. Elimination of uneven load in PTL can be performed by the phase angle control between the voltages at the beginning and end of the connection. One of the effective means for the phase angle control is a phase-shifting transformer (PST), the control of which is provided by the redistribution of power flows in individual PTLs of the section with the elimination of their uneven loading. On the example of simulation and computational experiments carried out in the power system of Azerbaijan, the effectiveness of use of voltage phase angle control in the power system with a significant uneven loading in the controlled sections of the supply network of the system is shown. Analysis of the effect of elimination of the unevenness on reducing losses in the network and increasing the efficiency of using power generation at stations is given.

Application of voltage phase angle control in power system with unevenly loaded supply network