Abstract
In recent years, ultra-low-frequency oscillation (ULFO) is a prominent problem in power systems of dominant hydropower. In order to suppress ULFO, the most effective strategy is the governor parameters optimization to improve the system damping within the ultra-low-frequency band. However, no explicit standard has been established to stipulate the level of system damping for ULFO suppression. In this paper, the key factors that affect the amplitude and damping of ULFO are firstly analyzed. Then, the design principle of the damping control index of ULFO is put forward. According to it, a damping control index is proposed. After that, a case of ULFO in an actual power system proves the rationality of the proposed index. Finally, the application of the index in the Southwest China Power Grid illustrates its effectiveness and feasibility.
Highlights
The exploitation of sustainability energy is essential for guaranteeing an energy supply of human society [1,2]
The control index is proposed for designing control strategies to damp ultra-low-frequency oscillation (ULFO), enhancing the stability of hydro-dominant power systems and
The control index is proposed for designing control strategies to damp ULFOs, enhancing the stability of hydro-dominant power systems and increasing the consumption capacity of hydropower sustainablity energy
Summary
The exploitation of sustainability energy is essential for guaranteeing an energy supply of human society [1,2]. In the 2016 asynchronous networking test of Yunnan power grid (YNPG), long-term and large-amplitude ULFO occurred with an oscillation period of about 20 s and an amplitude of ±0.1 Hz lasting for nearly half an hour. For the hydropower grid that SCPG and YNPG represent, there is no clear standard or requirement for the level to which the ULFO damping needs to be raised when formulating the ULFO suppression strategy. The lack of guiding foundation for the oscillation analysis in the operation of a practical power system requires for a specific index, based on which the control strategy and the damping control are designed. Control strategy of ULFO can be designed, avoiding the occurrence of oscillation or conservative strategy due to unclear indicators, which might reduce the consumption capacity and limit the sustainablility development of hydropower.
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