Control system of wind driven generator

Abstract

The invention discloses a control system of a wind driven generator. The control system comprises a main controller which is connected with a generator and a storage battery respectively, and is characterized in that: the main controller comprises a rectifying device, a pulse width modulation device and a control device, wherein the rectifying device is connected with an output end of the generator; the pulse width modulation device is connected with an output end of the rectifying device; and the main controller also comprises an inverter connected between the generator and the storage battery. Through the invention, the requirement on wind speed for generator start is low, electric energy can be output under a relatively low wind speed, and the utilization rate of wind power is high; the power control on the wind driven generator is optimized, and the generator efficiency is high; the power supply of the controller is stable and power failure caused by undervoltage of the storage battery is avoided so that the controller works more stably and the reliability is high; and an electromotor does not need to be added for auxiliary start, the cost is low, and the operation is reliable.

Description

technical field [0001] The invention relates to a control system, in particular to a control system of a wind generator. Background technique [0002] As a clean and environmentally friendly way of power generation, wind power generation has attracted more and more attention; but in reality, the natural wind is very unstable, and wind power generation relies on the natural wind to drive the wind wheel to rotate and drive the wind turbine to generate electricity. The working state of the wind turbine is also extremely unstable, so the wind turbine must be well controlled to ensure the safety and efficiency of the system, but the power curves of different wind turbines are different, and the working state of the wind turbine is unstable, and the output The power changes frequently and irregularly. The traditional wind power generation controller adopts the method of timing sampling. The main controller of the wind turbine adjusts the load size to match the power of the load an...

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Problems solved by technology

[0002] As a clean and environmentally friendly power generation method, wind power generation has been paid more and more attention; however, in reality, natural wind is very unstable, and wind power generation relies on natural wind to drive the wind wheel to rotate and drive the wind turbine to generate electricity. The working state of the wind turbine is also extremely unstable, so it is necessary to control the wind generator well to ensure the safety and efficiency of the system. The power changes frequently and irregularly. The traditional wind power generation controller adopts a timing sampling method. The main controller of the wind power generator adjusts the load size to match the load with the power of the generator and improve the efficiency of the generator. The traditional The controller adopts the curve automatic tracking method to adjust the load, and the data is calculated by sampling the slope of the generator power curve. The more sampling points, the higher the adjustment accuracy. However, in reality, the working state of the generator is complicated, sampling is difficult, and different The power curves of wind turbines vary greatly, and the versatility is poor. At present, the sampling frequency of commonly used controllers is around 10KHz, and the adjustment accuracy is not high, so it is difficult to achieve optimal power control.

[0003] At present, most wind turbines are directly driven by wind wheels, but traditional wind turbines use three-phase permanent magnet alternators, which have a large static torque and cannot be started when the wind speed is low, resulting in low power generation efficiency of the generator. The Chinese patent of application number 200810066917 discloses a kind of wind-driven generator, has increased motor monomer on the basis of original generator, can start motor monomer when wind power is insufficient, and auxiliary wind-driven generator starts, but this scheme cost is higher, Complex device, difficult control, low reliability

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