Abstract
With the construction of interconnected power grid and the rapid development of clean energy, the frequency problem of power system is becoming increasingly prominent. The problem of ultra-low frequency oscillation affects the stability of system frequency. In order to analyze the frequency regulation characteristics of the system, it is necessary to study the local active power control link and stability calculation model of the hydropower plant computer monitoring system. In this paper, the influence of the local active power control link of the monitoring system on the system frequency small signal stability is studied, and the model is built in the simulation program. Through the simulation of 4-machine-2 regional power grid, the influence characteristics of local active power control on frequency dynamic damping level are verified. In the example of large power grid, the coordination between the local active power control of the monitoring system and the speed regulation system of hydropower units is comprehensively considered, the suggestion of coordination of multi-level frequency modulation resources to system frequency regulation is put forward.
Highlights
The level of dynamic stability characteristics of the power system has gradually changed with the development of the power system[1,2]
After the speed control system measured model is applied to the field of power system stability analysis on a large scale, frequency oscillation problem caused by the changes on the grid operation mode has been improved, especially the ultra-low frequency oscillation that occurs in high-proportion hydropower systems[3,4]
The local active power control of the hydropower unit monitoring system and the speed regulation system work together to realize the direct adjustment of power and speed
Summary
The level of dynamic stability characteristics of the power system has gradually changed with the development of the power system[1,2]. This model can solve the current situation where there is no computer monitoring system local active power control model for hydropower generating units in power system analysis, can fully reflect the normal frequency adjustment process of the units, and improve the power and frequency simulation accuracy of stable calculations.
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