Abstract
Power System Stabilizer (PSS) is an important measure to increase damping and suppress low frequency oscillations of power system. During PSS test, the time constant of lead-lag compensator need to be configured, considering the inefficiency and optimization problem when configuring parameters empirically, this paper proposes automatic configuration method of PSS parameters based on Matlab, by setting the expected phase value at each frequency and constructing the objective function with the sum of phase differences square, the automatic calculation of PSS parameters under specific phase requirements at each frequency can be realized, the detailed steps of this method are given, and the method is verified during the PSS test of an 300Mw thermal-power generating unit finally.
Highlights
Low-frequency oscillation largely affects the stable operation of the power system
This paper proposes an automatic calculation method based on Matlab, and the new method is verified during power system stabilizer (PSS) test
The accelerating power variation ΔPa can be synthesized using signals of output power variation ΔPe and speed variation Δω, ΔPa is input signal of the threeorder lead-lag compensation compensator, Upss can be got from the output of three-order lead-lag compensation compensator, which is added to the voltage reference value of the automatic voltage control loop
Summary
Low-frequency oscillation largely affects the stable operation of the power system. The main reason of lowfrequency oscillation are negative-damping mechanism[1], forced-oscillation mechanism[2], nonlinear-mechanism[3] and strong-resonance mechanism[4], the negativedamping mechanism is a classic theory when studying low-frequency oscillation. Due to the phase-lag characteristics of the automatic regulator, excitation system and generator rotor winding, negative-damping torque is produced, which bring negative-damping of power system. For this reason, the power system stabilizer (PSS) is usually added to the regulator. PSS is an additional control device that adjusts the output rotor voltage with automatic-regulator to achieve the purpose of damping power system and other oscillations. By correctly configuring the leadlag time constant of the PSS2B model, can PSS have its due effect. EXCEL table is often used to adjust the time constant during PSS test, which takes a lot of time and can not get the best effect. This paper proposes an automatic calculation method based on Matlab, and the new method is verified during PSS test
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