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Variable-parameter capacitance compensation equivalent modeling method for wind power station of constant-speed wind power unit at fluctuating air speed

A wind turbine, wind speed fluctuation technology, applied in electrical digital data processing, special data processing applications, instruments, etc., can solve the problems of variable parameter capacitance difficult to calculate, reactive power error and other problems

Inactive Publication Date: 2011-04-27
HARBIN INST OF TECH
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Problems solved by technology

[0007] In order to solve the shortcomings of reactive power error in the equivalent model established by the traditional equivalent method under wind speed fluctuations, and the problem that the variable parameter capacitance is difficult to calculate in the equivalent model of the existing variable parameter compensation method, the present invention proposes a Equivalent modeling method of variable parameter capacitance compensation for wind farms with constant speed wind turbines under wind speed fluctuations

Method used

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  • Variable-parameter capacitance compensation equivalent modeling method for wind power station of constant-speed wind power unit at fluctuating air speed
  • Variable-parameter capacitance compensation equivalent modeling method for wind power station of constant-speed wind power unit at fluctuating air speed
  • Variable-parameter capacitance compensation equivalent modeling method for wind power station of constant-speed wind power unit at fluctuating air speed

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specific Embodiment approach 1

[0044] Specific implementation mode one: combine figure 1 To illustrate this embodiment, the variable parameter capacitance compensation equivalent modeling method of the fixed-speed wind turbine wind farm under wind speed fluctuations in this embodiment is to regard all the wind turbines in the wind farm as equivalent to one equivalent constant-speed wind turbine. The aerodynamic torque T of the wind turbine at the equivalent constant speed wind turbine is obtained by superimposing the outputs of the first n wind turbine aerodynamic models m_eq , and the wind turbine aerodynamic torque T m_eq Input to the two-mass shafting model, the two-mass shafting model also inputs the electromagnetic torque T output from the equivalent induction motor e_eq , the rotor speed ω output by the two-mass shafting model r_eq Given an equivalent induction motor, at the same time, the rotational speed ω of the n wind turbines output by the two-mass shafting model m_eq For n wind turbine aerody...

specific Embodiment approach 2

[0078] Specific implementation mode two: combination figure 2 Describe this implementation mode. The difference between this implementation mode and specific implementation mode 1 is that it is the case where reactive power compensation at the machine end is controlled by capacitor group switching, which is the same as the wind turbine machine terminal reactive power compensation without control. The parameter compensation capacitor C eq The acquisition method of , the C in formula 9 i It is obtained according to the control law of switching capacitors in groups. Other compositions and connection methods are the same as those in Embodiment 1.

specific Embodiment approach 3

[0079] Specific implementation mode three: combination figure 1 with figure 2 Describe this embodiment, the difference between this embodiment and specific embodiment 1 is that the calculation formulas of the parameters of the equivalent induction motor and the parameters of the equivalent transformer are as follows:

[0080] S eq = Σ i = 1 m S i , P eq = Σ i = 1 m P i , C ...

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Abstract

The invention relates to a variable-parameter capacitance compensation equivalent modeling method for a wind power station of a constant-speed wind power unit at a fluctuating air speed, which belongs to the technical field of wind power generation, overcomes the defect of reactive power error existing in an equivalent model established at the fluctuating air speed by the conventional equivalent method and solves the problem of difficult calculation of a variable-parameter capacitance in the equivalent model established by the conventional variable-parameter compensation. A method for calculating the variable-parameter capacitance is given for two machine end reactive compensation modes respectively by using the reactive power error between variable-parameter capacitance compensation before equivalence and variable-parameter capacitance compensation after equivalence, so that the wind power station model is equivalent to a constant-speed wind power unit at a fluctuating air speed. Themethod is suitable for dynamic equivalent modeling of a large-volume wind power station at a fluctuating air speed and analysis of the influence of the large-volume wind power station on a power system. The wind power station equivalent model can be applied to the researches of synchronization problem of the wind power station, such as dispatching and balancing of wind power, the problem of stable frequency at a constant air speed, analysis of the stability of stationary voltage of the wind power station and planning and design of a wind power station access system.

Description

technical field [0001] The invention relates to a dynamic equivalent modeling method of a wind farm of a fixed-speed wind turbine under wind speed fluctuations capable of quickly and accurately reflecting the characteristics of grid-connected points, and belongs to the technical field of wind power generation. Background technique [0002] With the rapid development of wind power generation in China and the implementation of the "Three Gorges on Land", large wind farms usually consist of hundreds or even thousands of wind turbines; Modeling, the model is complex, and the calculation time is long, taking up a lot of memory; therefore, the wind farm equivalent method has become a research hotspot; wind turbine components are divided into two types: fixed-speed wind turbines and variable-speed wind turbines; the present invention mainly provides The dynamic equivalence method of fixed-speed wind turbines and wind farms; the "Technical Regulations for Connecting Wind Farms to th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCY04S40/22Y02E60/76Y02E60/00
Inventor 苏勋文
Owner HARBIN INST OF TECH
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