Wind power plant level multi-working-condition double-fed unit static and stable order reduction method

Abstract

The invention relates to a wind power plant level multi-working-condition double-fed unit static and stable order reduction method. The method is technically characterized by comprising the following steps that 1, a double-fed unit coordinate system is built, and detailed models of super-synchronous, subsynchronous and power limited working stations of a double-fed unit are built; 2, single machine order reduction models under different working conditions are built based on the Lyapunov first method and the dominant mode method, dominant modes under different working conditions are determined, and a time-dominant simulation method is adopted for verifying accuracy of the single machine order reduction models; 3, the single machine order reduction models are expanded to a wind power plant, and applicability is verified. The built order reduction models completely cover the dominant state variables obtained after different operation working stations have access to a system, the model dimensionality of the double-fed unit is reduced to the largest degree on the premise that the dominant mode is not omitted, expansion can be carried out to achieve wind power plant level static and stable analysis, and curse of dimensionality is avoided.

Description

technical field [0001] The invention belongs to the technical field of electric power system operation and control, in particular to a method for reducing the order of static stability of a wind farm-level multi-working-condition doubly-fed unit. Background technique [0002] With the rapid development of the wind power industry, the doubly fed induction generator (Doubly Fed Induction Generator, DFIG) has been more and more popular due to its variable speed and constant frequency operation characteristics, and a series of advantages such as being able to participate in the reactive power regulation of the system. Favored, it has become the mainstream generator for wind farms. However, doubly-fed wind turbines include structures such as wind turbines, mechanical shafting, generators, PWM inverters, and control systems. The models are relatively complex. After being connected to the power system, the intrinsic structure of the system will be changed, and new static stability ...

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Problems solved by technology

[0004] However, doubly-fed wind turbines have sub-synchronous operating conditions, super-synchronous operating conditions and power-limited operating conditions. The existing reduced-order models only consider one or two of these operating conditions. verify the accuracy of

Moreover, the applicability of the single-machine reduced-order model to the wind farm level is not considered

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