A power optimization control method for front-end speed-adjustable wind turbines
A wind turbine and power optimization technology, which is applied in the control of wind turbines, wind power generation, wind turbines, etc., can solve the problems affecting the output power smoothness of wind turbines, the reliability of wind power grid connection, poor low-voltage ride-through capability, and reactive power output capability. Insufficient and other problems, to achieve the effect of solving poor low-voltage ride-through capability, improving wind power quality, and optimizing control
Inactive Publication Date: 2019-04-16
LANZHOU JIAOTONG UNIV +1
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Problems solved by technology
Traditional doubly-fed and direct-drive rear-end frequency-stabilized wind turbines have problems such as poor low-voltage ride-through capability and insufficient reactive power output capability, which affect the smoothness of wind turbine output power and the reliability of wind power grid connection.
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[0028] As shown in the drawings, the control system of the front-end speed-adjustable wind turbine includes a pitch controller 1, a pitch mechanism 2, a gearbox 3, a guide vane controller 4, a hydraulic torque variable speed regulation mechanism 5, a synchronous motor 6 and Power optimization controller 7, the system controls the power by adjusting the pitch angle, and realizes the speed regulation control by adjusting the opening of the guide vane. The pitch angle and the opening of the guide vane are determined by the power optimization controller 7, where β opt with theta opt For the optimized parameters, the power optimization controller 7 calculates the steps of the pitch angle and guide vane opening as follows:
[0029] 1. Build the objective function
[0030] The objective function is constructed according to the stability of the output speed of the hydraulic torque variable speed regulating mechanism 5 and the smoothness of the output power of the synchronous motor 6 ...
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The invention discloses an optimal control method for the power of a front end speed adjusting type wind turbine unit. The optimal control method can inhibit the power fluctuation of a power generator and ensure smoothness of the output power of the unit. A control system of the front end speed adjusting type wind turbine unit comprises a variable-pitch controller, a variable-pitch mechanism, a gearbox, a guide vane controller, a hydraulic variable-torque speed adjusting mechanism, a synchronous motor and a power optimization controller. According to the system, the power is controlled by adjusting the pitch angle, speed adjusting control is achieved by adjusting the aperture of guide vanes, and the pitch angle and the aperture of the guide vanes are determined by a power optimization controller. The steps of the power optimization controller for calculating the pitch angle and the aperture of the guide vanes include that firstly, an objective function is constructed according to the output rotating speed of the hydraulic variable-torque speed adjusting mechanism and the output power of the synchronous motor; secondly, constraint conditions are given; and thirdly, the objective function is optimized.
Description
technical field [0001] The invention belongs to the technical field of wind power generation, and in particular relates to a power optimization control method for a front-end speed-regulating wind turbine. Background technique [0002] With the rapid development and maturity of the wind power industry, the operating efficiency of wind turbines has received more and more attention and research. Traditional doubly-fed and direct-drive rear-end frequency-stabilized wind turbines have problems such as poor low-voltage ride-through capability and insufficient reactive power output capability, which affect the smoothness of wind turbine output power and the reliability of wind power grid connection. The new front-end speed-adjustable wind turbine uses a brushless electric excitation synchronous generator to generate electricity, and the speed is adjusted at the front end of the synchronous generator by a hydraulic torque variable speed control drive, which solves the problem of po...
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IPC IPC(8): F03D7/00G06F17/10
CPCY02E10/72
Inventor 董海鹰张生睿曹立新李宏伟李晓青
Owner LANZHOU JIAOTONG UNIV