Study on the Adaptability of Power System Stabilizer Parameters under Deep Peak Regulation Condition

With the rapid development of Chinese new energy industry and the relative excess capacity of the traditional thermal power industry, more and more thermal power units participate in the operation of “deep peak regulation”. Whether the power system stabilizer (PSS) parameters set under the condition of large load can still effectively suppress low-frequency oscillation under the condition of “deep peak regulation” is the key to ensure the safe operation of power system in “deep peak regulation”. Firstly, the basic principles of low-frequency oscillation and the action of PSS are described based on the Philips-Heffron model, and the influence of active load variation on the uncompensated characteristics of the generator excitation system was theoretically analyzed. Then based on the establishment of RTDS generator model platform, the uncompensated characteristics of the generator excitation system under different active loads was calculated. Under the condition of using the same PSS parameters, the effects of single-machine and dual-machine model systems PSS on suppressing low-frequency oscillations were simulated and studied respectively. Finally, the simulation research results are verified by on-site real machine test.