A wind power generation maximum power tracking method without speed sensor

A maximum power tracking, speed sensorless technology, applied in wind power generation, wind turbine, wind turbine control, etc., to solve measurement problems and reduce operating costs

Inactive Publication Date: 2017-10-10
CHONGQING UNIV
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Problems solved by technology

Although this method does not need to measure the wind speed, it faces the problem of measuring the fan speed and the maximum output power of the fan. It can only be in the suboptimal state of maximum power tracking, and can basically achieve the purpose of maximum power tracking.

Method used

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  • A wind power generation maximum power tracking method without speed sensor
  • A wind power generation maximum power tracking method without speed sensor
  • A wind power generation maximum power tracking method without speed sensor

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Embodiment Construction

[0043] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0044] A wind power generation maximum power tracking method without a speed sensor, its principle is as follows figure 1 As shown, the method includes the following steps:

[0045] 1) Obtain the relationship curve between the maximum wind energy capture and the motor speed through experiments:

[0046] According to the aerodynamic theory, the aerodynamic power captured by the wind wheel can be expressed as

[0047]

[0048] In the formula: ρ is the air density; R is the impeller rotation plane radius; C p(λ, β) is the wind energy utilization coefficient of the wind turbine; β is the pitch angle; ν is the wind speed; λ=ω w R / ν is the tip speed ratio, ω w is the angular velocity of the fan. In the maximum power tracking stage, generally only the fan speed is adjusted, while the pitch angle remains unchanged. The purpose of the...

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Abstract

The invention discloses a wind power generation maximum power tracking method of a speedless sensor. The method comprises the steps of: 1) obtaining maximum wind power through an experiment to capture a relation curve with the rotating speed of a motor; 2) performing the modeling analysis for the electromagnetic torque of a generator; 3) analyzing a transmission chain model in a maximum power tracking state; 4) determining a relation between an optimal output power and synchronous speed of an induction motor, and building a lookup table; and 5) designing an adaptive controller for a system. The method can realize the maximum power tracking of a wind driven generator in low wind speed without measuring the rotating speed of the wind driven generator, the wind magnitude and the direction. As the magnitude and the direction of wind are difficult to be invariable under the influence of various factors, the accurate measuring process is complex, and the system cost is increased. Therefore, the method effectively solves the measuring difficulties in the measurement of wind magnitude and direction in a conventional wind power generation system, and reduces the system cost to a certain extent.

Description

technical field [0001] The invention relates to the field of maximum power tracking control of a wind power generation system, in particular to a control method for maximum power tracking that does not require a speed sensor. Background technique [0002] Wind is difficult to keep constant in space and time, coupled with its unpredictability and intermittent nature, the full utilization of wind energy faces many challenges. At present, variable-speed fixed-pitch systems are widely used in wind power generation systems. The wind energy obtained by the fan is related to the ratio of the tip speed of the wind rotor to the wind speed (tip speed ratio). When the wind speed is low, the purpose of the control is to adjust the speed of the fan through the power electronic device as the wind speed changes, so that the blade tip ratio is at the optimum value, so as to ensure the maximum wind energy captured by the fan and the highest power generation efficiency. [0003] The existing...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B13/04F03D7/00
CPCY02B10/30Y02E10/72
Inventor 王磊罗治伟苏晓杰张虎陈柳
Owner CHONGQING UNIV
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