Voltage-frequency comprehensive control method for direct-drive wind generator set

A wind turbine and control method technology, which is applied to wind power generation, control system, and generator control, etc., can solve problems such as difficulty in rationally assigning active power regulation tasks, protection and cutting of wind turbines at low speeds, and large differences in active power regulation capabilities.

CN102222938AInactive Publication Date: 2011-10-19CHINA AGRI UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2011-10-19
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a voltage-frequency comprehensive control method for a direct-drive wind generator set and relates to the technical field of new energy power generation. The method comprises the following steps of: 1, detecting a pitch angle and a rotating speed and an electromagnetic torque of a generator when the wind generator set operates, and sampling the detected values; 2, converting the degree of membership of an operating state of the generator set; 3, calculating a virtual excitation regulation command value and a virtual torque regulation command value of each generator setin a wind power station; 4, calculating a dynamically adjusted coordination degree parameter K of the rotating speed of the wind generator set; 5, calculating a pitch control command value and a power regulation command value of a permanent magnet direct-drive wind generator set, superposing the values with the parameter K and transmitting to a comparator; and 6, controlling a pitch control mechanism and a converter control mechanism, detecting the pitch angle of the wind generator set in real time, outputting active and reactive power, and transmitting a feedback signal to the comparator forfeedback control. By the method, actual working conditions can be accorded, and a variable-speed constant-frequency direct-drive motor wind power station can be better subjected to comprehensive optimal control.
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Description

technical field

[0001] The invention relates to the technical field of new energy power generation, in particular to a voltage-frequency comprehensive control method of a direct-drive wind turbine considering changes in wind speed. Background technique

[0002] The comprehensive control of direct-drive wind turbines is a very critical link in the entire wind power generation control system, which directly affects the operating efficiency of wind turbines and the ability of the grid to accept wind power.

[0003] The comprehensive control of existing wind turbines usually adopts the control method of direct voltage and direct torque, for example, the invention patent CN101272117A the voltage and reactive power fast control method of the variable speed constant frequency wind turbine wind farm, and the invention patent CN101860042A The coordinated control of the active power of the wind farm method, its implementation is mainly to compare the real-time state quantity of the wi...

Examples

Embodiment Construction

[0041] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0042] Such as figure 1 As shown, the direct-drive wind turbine voltage-frequency comprehensive control method of the present invention includes the following steps:

[0043] S1: Detect the operating state parameters of the wind turbine, and sample the detected values;

[0044] In this step, the sampling frequency is not lower than 0.7 Hz; the operating state parameters of the wind turbine include: pitch angle, generator speed and electromagnetic torque.

[0045] S2: Convert the degree of membership of the operating state parameters of the wind turbine to the operating area I, operating area II, and operating area III, and the degree of membership

[0046] ...