Abstract
With the rapid development of DC asynchronous interconnection, in order to ensure the frequency quality, higher requirements are put forward for the primary frequency control of hydropower units. In the high proportion hydropower system, it is difficult for the governor parameters to meet the requirements of primary frequency control and dynamic stability simultaneously. In order to solve the problem, this paper proposes a recommended parameter switching method by referring to the Nordic system. The parameter optimization methods before and after switching are proposed, and the effectiveness of the method is verified by time domain simulation.
Highlights
Frequency reflects the balance between power generation and electricity consumption and is an important index to be controlled in the operation of power system
The governor parameters of the unit are set in some power plants to be extremely sensitive to the grid frequency deviation, the unit can quickly and fully make the frequency back when the frequency deviation occurs
How to adjust the parameters of the hydropower unit governor to make it take into account the speed and dynamic stability of the primary frequency control at the same time has become an urgent key technical problem to be solved
Summary
Frequency reflects the balance between power generation and electricity consumption and is an important index to be controlled in the operation of power system. How to adjust the parameters of the hydropower unit governor to make it take into account the speed and dynamic stability of the primary frequency control at the same time has become an urgent key technical problem to be solved. In references [2,3], governor parameters are optimized to suppress the ultra-low frequency oscillation. In order to solve the problem, this paper refers to the two kinds of parameter switching methods of the governor of hydropower units in the Nordic system from [6], carries out comparative analysis and puts forward the recommended parameter switching method, so as to suppress ultra-low frequency oscillation from the side of the power plant. The parameter optimization methods before and after switching are proposed, and the effectiveness of the methods are verified by time domain simulation
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