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Control method for tracking maximum power point of wind electric power generation

A technology of maximum power point and maximum power, which is applied in control system, generator control, adaptive control, etc., can solve problems such as inaccurate power control, system oscillation, and generators not fully reflecting wind energy, etc., to achieve faster follow-up performance , to ensure the effect of accuracy

Inactive Publication Date: 2007-05-09
HEFEI UNIV OF TECH
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Problems solved by technology

However, this method cannot be applied to the rapid change of the fan. Because the change of the wind speed causes the change of the speed of the wind rotor, a part of the wind energy is stored in the impeller, so the measurement of the output power of the generator cannot fully reflect the change of the wind energy. Lead to inaccurate power control, and vibration of the system near the maximum power point due to speed disturbance

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  • Control method for tracking maximum power point of wind electric power generation
  • Control method for tracking maximum power point of wind electric power generation
  • Control method for tracking maximum power point of wind electric power generation

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Embodiment Construction

[0018] In this embodiment, a double-closed-loop control method for speed and power is set independently of each other, and the control process is divided into three stages:

[0019] a. In the initial state, the original maximum power curve is obtained according to the original power characteristics of the fan, and power signal feedback control is performed on the fan according to the original maximum power curve during the first operation;

[0020] b. When the change in wind speed is small, use the hill-climbing power optimization control method to obtain the maximum output power at the current wind speed and the corresponding generator speed through the speed disturbance. According to the original maximum power curve and the newly added data points, the maximum power curve Correction is performed, and the curve is corrected in real time every time a new data point is obtained during the operation, so as to obtain the corrected maximum power curve;

[0021] c. When the wind sp...

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Abstract

The special point is the twin closed loop method for controlling rotary speed and power mutual independently. The control process includes 3 steps: during the original state, executes the power signal feedback control against the fan according to the original max power curve; during the smaller change of wind speed, executes mountain climbing method for controlling optimal power; via the rotary speed disturbance, obtains the max output power under the recent wind speed and the corresponding generator rotary speed. Then according to the original max power curve and the new added data points, obtains modified max power curve. During the larger change of wind speed, executes the power signal feedback control according to the mortified new max power curve. This method adapts the rapid change of the wind speed and is independent from the functions of the wind field and the fan. It can restrain the system disturb near the max power point effectively.

Description

Technical field: [0001] The invention relates to a method for tracking and controlling the maximum power point of wind power generation. More specifically, it is the maximum power point tracking control method applied in the variable speed constant frequency wind power generation system. Background technique: [0002] The conventional maximum power tracking (MPPT) control in the variable-speed constant-frequency wind power generation system adopts three methods, which are the tip speed ratio control method, power signal feedback control and hill-climbing method optimization control. [0003] The tip speed ratio control method is to adjust the mechanical structure of the wind rotor so that the wind rotor captures the maximum power, mainly depends on the tip speed ratio of the fan and the wind speed curve, and controls the pitch of the blade by controlling the pitch change mechanism of the wind rotor. Windward angle, so that the tip speed ratio of the wind rotor reaches the m...

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Application Information

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IPC IPC(8): H02P9/00G05F1/67G05B13/02
Inventor 张兴程显忠谢震杨淑英曹仁贤
Owner HEFEI UNIV OF TECH
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