Parameter design of governor power system stabilizer to suppress ultra-low-frequency oscillations based on phase compens
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ORIGINAL PAPER
Parameter design of governor power system stabilizer to suppress ultra-low-frequency oscillations based on phase compensation Xin Zhou1 · Muhammad Usman2 · Peng He1 · Muhammad Shahid Mastoi2 · Shaobo Liu2 Received: 2 December 2019 / Accepted: 27 August 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract In a few of the isolated DC power-transmission systems with hydropower units (and the associated water hammer effect), inappropriate governor control parameters may weaken the system damping and stability. It has the potential to result in ultra-low-frequency oscillations (ULFO) which is below 0.1 Hz. To carry out this issue, a linearized state-space model of a multi-machine system that includes hydropower and steam turbine governor control systems is presented in this paper. The oscillation mode of ULFO about the damping characteristics of the governor control system is analyzed by the damping torque analysis method. A governor power system stabilizer (GPSS) design model predicated on phase compensation principle to heighten the damping of the governor control system to subdue ULFO is planned. To verify its effectiveness, the designed GPSS is applied to a single-machine system, a 4-machine 2-area system as well as the Yunnan power grid system of China. The simulation results demonstrate that GPSS effectively suppresses ULFO with heightened ULFO damping by the optimized settings of governor control parameters. Keywords ULFO · Characteristic analysis method · Damping torque analysis method · Phase compensation principle · GPSS
1 Introduction By interconnection of power systems, the stability of a large-scale power system becomes more important and challenging. Usually, the electric power stations and sources are far away from the load centers [1]. In a power system, power generation (turbines, generators) and loads (consumption) are interconnected through a network, of various power equipment and transmission lines (AC as well as DC lines). Power system is continually exposed to instabilities, such as fluctuations of load and line breakdown. It happens due to different reasons like low- or ultra-low-frequency oscillations (LFO and ULFO, respectively, 0.1–2.0 Hz is LFO, below 0.1 Hz is ULFO). Hydropower has an important role in the safe, stable, and efficient operation of the electric power system. Supply of stable and balanced electric power during such instabilities, proper operations of a controller, such
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Muhammad Usman [email protected]
1
Yunnan Electrical Power Research Institute, Kunming 650217, Yunnan, China
2
School of Electrical Engineering, Southwest Jiaotong University, Sichuan 610031, Chengdu, China
as an excitation system or a governor are required. In sizeable power systems, wide-ranging low-frequency oscillation (LFO) threatens the operational stability. So exact assessment and suppression of the dominant oscillation mode are some of the important factors for the steady and stable operation of the system. In the power system, oscillation occu
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