Doubly-fed wind turbine generator electromagnetic transient simulation starting method based on dual-mode switching

Abstract

The invention discloses a doubly-fed wind turbine generator electromagnetic transient simulation starting method based on dual-mode switching, and belongs to the technical field of power system simulation. The method comprises the following steps: determining the initial rotating speed of a draught fan according to the tide result of the doubly-fed induction generator, and determining the initial value of an electromagnetic transient simulation model of the doubly-fed induction generator in an iterative computation mode according to the rotating speed distribution power; enabling the converter to adopt an average value model mode to determine an initial value of simulation calculation of the doubly-fed wind turbine generator; executing electromagnetic transient simulation calculation of a simulation time step, and obtaining a simulation calculation result; and comparing the active power input into the power grid by the doubly-fed wind turbine generator in the simulation calculation result with the active power of the power flow result to obtain a difference value, and if the difference value is smaller than a preset threshold value, switching to a detailed model mode of the converter, and ending the starting process. The flat start of the electromagnetic transient simulation of the doubly-fed wind turbine generator comprising the detailed converter model in the large power grid can be realized based on the tide result and the basic parameters.

Description

technical field [0001] The present invention relates to the technical field of power system simulation, and more specifically, relates to a double-fed wind turbine electromagnetic transient simulation startup method based on dual-mode switching. Background technique [0002] The zero-start initialization method is often used in AC / DC electromagnetic transient simulation, which is only suitable for small-scale simulation systems. When the simulated power grid exceeds a certain scale, the zero-start method is not only time-consuming, but also requires manual adjustments to achieve the specified power flow operation state. , the detailed transient model of power electronic equipment is much more complex than the steady state model, highly nonlinear, and contains a large number of high-order harmonics, making it impossible to obtain the initialization state through simple fundamental wave power flow, and it is necessary to study a special initialization strategy. Therefore, in I...

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Problems solved by technology

[0002] The zero-start initialization method is often used in AC / DC electromagnetic transient simulation, which is only suitable for small-scale simulation systems. When the simulated power grid exceeds a certain scale, the zero-start method is not only time-consuming, but also requires manual adjustments to achieve the specified power flow operation state. , the detailed transient model of power electronic equipment is much more complex than the steady state model, highly nonlinear, and contains a large number of high-order harmonics, making it impossible to obtain the initialization state through simple fundamental wave power flow, and it is necessary to study a special initialization strategy. Therefore, in In the electromagnetic transient simulation initialization of wind turbines with detailed converter models, the zero-start initialization method is no longer competent, and the initial state cannot be directly obtained based on the fundamental wave power flow results. It is necessary to study a more applicable electromagnetic transient simulation of double-fed wind turbines. flat boot method

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