Wind driven generator torque control method for passing through resonance band quickly
A technology of wind turbine and torque control, which is applied in the control of wind turbines, wind turbines, wind power generation, etc. It can solve problems such as tower resonance, passing through resonance bands, wind load influence, etc., and is easy to program and realize. , reduced load, and low hardware requirements
Inactive Publication Date: 2015-04-01
SHENYANG INST OF AUTOMATION - CHINESE ACAD OF SCI
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Problems solved by technology
At present, the commonly used torque control algorithm is to add a notch filter to the closed-loop control of the speed, and also to avoid the given value of the impeller speed at the resonance point in the given value of the impeller speed corresponding to the resonance frequency. These control methods either The load of the fan has a great influence, or it cannot pass through the resonance zone quickly, and ultimately cannot perfectly solve the problem of tower resonance
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[0041] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.
[0042] Such as figure 1 As shown, section bg is the speed / torque curve drawn according to the optimum tip speed ratio of the impeller, which is expressed in the form of two-dimensional table T of speed / torque in the present invention, as shown in Table 1.
[0043] Table 1 Speed / torque table
[0044]
[0045]
[0046] First set the generator resonance speed value Sz and the generator speed S corresponding to the resonance zone, then calculate the resonance zone lower limit speed value S2 and the resonance zone upper limit speed value S3 according to the values of Sz and S, and then check the speed / torque table T to get c Calculate the torque value Mc at point c and the torque value Mf at point f, calculate the generator power Pc corresponding to point c and the generator power Pf corresponding to point d, increase the torque value at p...
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The invention relates to a wind driven generator torque control method for passing through a resonance band quickly. The method comprises the steps of setting a resonance region according to a generator speed value corresponding to a resonance frequency of a tower and bandwidth of the resonance band, setting different generator torques according to the current generator speed value and a wind speed value, and allowing the generator speed value to pass through a region between a low-speed region and a high-speed region quickly. The control method comprises the steps of a first-order filtering algorithm of generator speed, torque increasing value calculation of the low-speed region, torque increasing value calculation of the high-speed region, judgment and switching of six different running states of a fan. The control method has the characteristics of reducing the load of the fan, effectively improving the safety of the fan and prolonging the service life of the fan; the power grid fluctuation due to frequent switching of the fan near a resonance point is avoided; and the power quality can be improved effectively.
Description
technical field [0001] The invention relates to a torque control technology of a wind power generator, in particular to a torque control method that can quickly cross a resonance zone and is applied to a megawatt-level asynchronous double-fed wind power generator. Background technique [0002] The speed control of megawatt-level asynchronous doubly-fed wind turbines is currently controlled by pitch control and torque control. The torque control is mainly used below the rated wind speed. Since the speed of the upwind-type horizontal-axis variable-speed fan changes continuously along the optimal tip speed ratio curve below the rated wind speed, when the impeller rotates and the tower of the fan produces force due to aerodynamic influence, if a certain speed When the force frequency of the lower wind wheel is consistent with the natural frequency of the tower, resonance will occur, resulting in damage or even toppling of the fan. In order to avoid the tower resonance caused b...
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IPC IPC(8): H02P9/00
CPCF03D7/0276F03D7/0296Y02E10/72
Inventor 杜劲松吴景辉苏浩郭锐
Owner SHENYANG INST OF AUTOMATION - CHINESE ACAD OF SCI