An Online Prediction Method of Power Grid Frequency Situation Considering Wind Power-DC Auxiliary Frequency Regulation

Abstract

The present invention provides an online prediction method for power grid frequency situation considering wind power-DC auxiliary frequency modulation, which considers the role played by thermal power units, wind power units, DC transmission systems and pumped storage power stations in system frequency adjustment, and collects power grid operation online Based on state data and unit equipment information, an aggregation model for thermal power units, wind turbines, DC transmission systems and pumped storage power stations participating in frequency adjustment is established. The aggregation model characterizes the frequency modulation process of thermal power units, wind turbines, DC transmission systems and pumped storage power plants in the form of transfer functions. Compared with existing methods, this method can take into account the role played by wind turbines and DC transmission systems in frequency regulation, and predict the dynamic process of system frequency changes more quickly, thereby improving the perception and accuracy of power grid frequency situation prediction , which has important guiding significance for power grid dispatching.

Description

technical field [0001] The invention belongs to the technical field of power system situation awareness and trend prediction, and relates to an online frequency situation prediction method of a power grid considering wind power-direct current auxiliary frequency modulation. Background technique [0002] With the rapid development of technologies such as renewable energy power generation and DC long-distance transmission, the degree of power electronics in power systems continues to increase, and the fast and flexible characteristics of power electronic converters have begun to profoundly affect the dynamic behavior of power systems. Efficient operation brings opportunities and challenges. Taking Central China Power Grid as an example, the large-scale commissioning of new energy units and the intensive feed-in of multi-DC will cause a large number of conventional thermal power units in the system to be replaced, the moment of inertia and equivalent scale of the system will co...

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Problems solved by technology

[0003] It can be seen that the traditional system frequency response model only considers the frequency modulation effect of thermal power units. After the renewable energy is connected to the grid, the composition of the system power supply is complex, and the model will not be comprehensive enough in the online prediction of the grid frequency situation.

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