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Wind speed uncertainty counted double-fed wind power additional damping controller 'domain' design method

A technology of additional damping and double-fed wind power, which is applied in the direction of single-grid parallel feeding arrangement, reducing/preventing power oscillation, etc., can solve problems such as difficult damping controllers, and achieve robustness, good application value, and strong practicability Effect

Active Publication Date: 2018-01-12
SOUTHEAST UNIV
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Problems solved by technology

However, the traditional small-disturbance stability domain is bounded by the imaginary axis, which is often used to judge the stability range of the system, which is difficult to apply to the design of damping controllers.

Method used

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  • Wind speed uncertainty counted double-fed wind power additional damping controller 'domain' design method
  • Wind speed uncertainty counted double-fed wind power additional damping controller 'domain' design method
  • Wind speed uncertainty counted double-fed wind power additional damping controller 'domain' design method

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Embodiment Construction

[0031] The technical solution of the present invention will be further introduced below in combination with specific implementation methods and accompanying drawings.

[0032] The verification example used in this specific implementation is a wind power delivery system with doubly-fed wind farm and series capacitance compensation, and its system structure is as follows figure 2 shown. The double-fed wind farm is composed of several identical 1.5MW double-fed wind turbines. Each double-fed wind turbine is connected to the same busbar for grid-connected power generation through a 0.69 / 35kV on-site transformer T1. The entire double-fed wind farm adopts a single machine equivalent model. simulation. The entire double-fed wind farm is then connected to the 220kV line through the 35 / 220kV transformer T2, and finally connected to the 500kV line through the 220 / 500kV step-up transformer T3 for long-distance power transmission, and a series capacitor is installed in the 500kV line fo...

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Abstract

The invention discloses a wind speed uncertainty counted double-fed wind power additional damping controller 'domain' design method. The method includes steps: S1, establishing a state-space equationof a double-fed wind power delivery system; S2, selecting critical damping alpha cri, and taking a wind speed formed 'wind speed stability domain' as a target to optimize each parameter of an additional damping controller according to a genetic algorithm; S3, according to each parameter, obtained by optimization in the step S2, of the additional damping controller, subjecting the wind power delivery system to characteristic value analysis, judging whether the adopted additional damping controller enables the 'wind speed stability domain' to be the largest or not, if not, returning to the stepS2, and if yes, finishing. The method guarantees robustness of the controller to the greatest extent and is also applicable to design of other additional damping controllers and high in application value.

Description

technical field [0001] The invention relates to the field of power system stability and control, in particular to a "domain" design method of a doubly-fed wind power additional damping controller considering wind speed uncertainty. Background technique [0002] Large cluster wind power access is the development direction of China's power grid. Due to the regional characteristics of wind energy, the overall distribution of wind energy resources and load centers in my country is reversed. Large-scale, high-voltage, and long-distance transmission of wind power is essential. Series capacitor compensation is one of the economical and effective measures to solve the long-distance transmission of electric power, and it is also the main measure for the long-distance transmission of wind power grid-connected. The transmission of thermal power through series compensation is easy to cause the problem of subsynchronous resonance, which has been well known. In recent years, the subsync...

Claims

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Application Information

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IPC IPC(8): H02J3/24H02J3/38
Inventor 吴熙宁威关雅静
Owner SOUTHEAST UNIV
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