A method for calculate that transient stability of a power network contain doubly-fed induction wind turbine generators

Abstract

The invention relates to the field of wind power generation, A method for calculate that transient stability of a power network contain doubly-fed induction wind turbine generators, By switching alternately in each iterative step of the calculation period to solve the differential equations describing the rotor motion state of the synchronous machine and the algebraic equations describing the voltage and current constraints of each node in the network, At the end of the calculation, the power angles of each synchronous generator in the network can be obtained, and the transient stability of the system after various disturbances can be analyzed. The transient stability analysis is decomposed into algebraic equations and differential equations, which reduces the risk of non-convergence. At the same time, the LU decomposition method is used to solve the higher order algebraic equations, which avoids the matrix inverse operation, improves the computing speed and reduces the computer memoryspace. For the solution of differential equations, an improved Euler method is used to construct aprediction-calibration system to improve the computational accuracy.

Description

technical field [0001] The invention relates to the field of wind power generation, in particular to a calculation method for transient stability of a grid containing double-fed induction wind turbines. Background technique [0002] Science and technology, as scouts for the formation and application of new industries, study the grid connection conditions, operation and control theories, and emergency fault handling methods for wind power capacity with a certain application scale connected to the traditional power grid. Grid-connected wind power is of great significance in the safe, reliable and economical operation of traditional power grids. [0003] The power generation method using a wind turbine as a prime mover is a new type of power generation that is different from using a steam turbine or a water turbine as a prime mover. The doubly fed induction generator (Doubly Fed Induction Generator, DFIG) is the most widely used wind power at this stage. unit. With the contin...

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Problems solved by technology

However, wind energy in nature itself has fluctuations and mutations. Moreover, due to the influence of factors such as the topographical environment inside the wind farm area and the arrangement of wind turbines, the wind speed reaching the windward side of each wind turbine in the wind farm at a certain moment is different. There may be differences, so that the output po

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