Dynamic simulation system and simulation method for accessing wind power into power grids

Abstract

The invention provides a dynamic simulation system and a simulation method for accessing wind power into power grids, and belongs to the field of physical simulation of power systems. The simulation system comprises a wind power simulation unit, a line simulation unit, a generator simulation unit and a power grid simulation unit, wherein the wind power simulation unit and the generator simulation unit are respectively connected with the power grid simulation unit by the line simulation unit, and the line simulation unit comprises a fault simulation unit and a line switch. The dynamic simulation system simulates different situations for accessing wind power into power grids, carries out research on the stability, reliability and fault characteristics of the simulation system, and simulates the operation of a wind turbine according to the operating characteristics of a real wind field; and the simulation method is simple, reliable, and strong in practical applicability, and provide scientific evidences for analyzing the protection performance of a system for accessing wind power into power grids, therefore, the safety of a power grid system is facilitated, and the operation risks caused by large-scale renewable energy grid connection can be reduced.

Description

technical field [0001] The invention relates to the field of physical simulation of power systems, in particular to a dynamic simulation system and method for connecting wind power to a power grid. Background technique [0002] In recent years, in the field of renewable energy power generation in my country, wind power has developed rapidly. According to the plan, by 2020, the installed capacity of wind power will reach 100 million kilowatts, and a number of "10 million kilowatt-level wind power bases" will be built. The overall wind power presents the characteristics of large-scale, long-distance, high-voltage, and centralized access. my country is very rich in wind power resources, and the total reserves of land wind energy resources available for development are 253 million kilowatts. Wind power generation has become an important development direction supported by my country's energy policy. [0003] In regional power grids with a large proportion of wind power installed...

AI Technical Summary

Problems solved by technology

[0005] For variable-speed wind turbines, due to the control function of the control system, the speed of variable-speed wind turbines is completely decoupled from the grid frequency, so that the wind turbines cannot provide frequency response to the grid when the grid frequency changes, reducing the inertia of the entire grid

At this time, if there is a power shortage in the power grid, the change rate of the grid frequency reduction will be high, and the frequency drop will be large, which is not conducive to the frequency stability of the grid.

In addition, the large-scale off-grid of wind turbines will cause large fluctuations in system frequency

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