In the paper, the important issues of the power system stability have been considered. The theoretical backgrounds of small-signal stability analysis for power systems studies and its application for validation of power system dynamic models using transient stability are presented. The considered example of dynamic models validation uses procedures based on the both small-signal stability analysis and time domain simulation.
At present, in Ukraine, the activities are held to provide the synchronous operation of the national IPS with European grid ENTSO-E. It requires solving of numerous tasks including the frequency stability and export power flow control in order to provide a flexible control of the IPS operation. In particular, including a DC link in the “Burshtyn island” interface in most cases will improve a reliable schedule implementation to ENTSO-E and will increase the reserve capacity at Burshtyn thermal power plant.
Taking into account the stated above, the frequency stability of the IPS of Ukraine has been studied considering DC link connecting Khmelnitskaya nuclear power plant and Rzeszow substation. In order to simulate long-term dynamics, the detailed model has been developed including the automatic power controller of “Burshtyn island”, automatic generation controllers of IPS of Ukraine and unified power system of Russia, DC link control system and ENTSO-E border area models. The frequency control simulation is performed in the event of generating unit disconnection at Burshtyn thermal power plant.
The obtained simulation results show that modern DC link application provides a flexible regulation of the export power flows in AC/DC hybrid power systems to control the reserve capacity of Burshtyn TPP. Due to the active power flexible regulation by modern DC link, it becomes possible to use the secondary reserves controlled by the national automatic generation controller for “Burshtyn island”.
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