Method for controlling maximum power tracing based on wind power generation

Abstract

The invention provides a method for controlling maximum power tracing based on wind power generation. The method comprises the step of setting original values of parameters such as the step length, the adjusting frequency and the stopping power tracing threshold, the step of sampling a voltage, a current and a frequency and the step of judging and adjusting the frequency. The whole operating process is precise and simple, easy to implement and high in practicability. Multi-dimensional control is carried out by changing the step length, the tracing frequency and the stopping power tracing threshold, the dynamic performance of tracing is improved, and the accuracy of tracing is increased. The strategy of absorbing power dynamically at intervals is adopted, when the wind speed is low and the revolving speed of a draught fan is low, the problems of stalling operation and rotation stopping of the draught fan are solved, and practicability is high. When it is judged that the revolving speed of the draught fan is not changed consecutive several times, continuous tracing after adjustment is carried out on the step length, the tracing frequency and the stopping tracing power threshold, a forced restarting and tracing mechanism is adopted, the problem of invalid tracing caused by non-changing of the measured revolving speed for a long time is solved, the situation that the wind speed fluctuates along with the wind speed is adapted, and the tracing accuracy is improved.

Description

technical field

[0001] The invention relates to the field of wind power generation, in particular to a method for maximum power tracking control based on wind power generation. Background technique

[0002] As the energy crisis becomes more and more obvious around the world, the development of renewable energy has become a major measure of the energy development strategies of countries all over the world. Due to its huge global reserves, renewable, wide distribution, and non-polluting characteristics, wind power has become a widely researched renewable energy. How to capture wind energy with maximum efficiency is a key issue in wind power research.

[0003] The commonly used maximum power tracking (MPPT) control methods in variable speed constant frequency wind power generation systems include tip speed ratio method, hill climbing method optimal control and power curve method. Since the power curve method is based on the maximum power curve of the wind turbine, different s...

Examples

Embodiment 1

[0061] A method of maximum power tracking control based on wind power generation, see figure 1 , including the following steps:

[0062] Step 1: Initialize, obtain the initial speed ω(0) of the fan, set the stop power tracking threshold setPd(0), adjust the frequency f(0), the initial step size Step(0), the minimum speed adjustment threshold setSd and the dynamic interval are different The time period is T, and the stop power tracking threshold setPd(0) is obtained according to the formula ⑤:

[0063] setPd(k)=λ setPd(k) ·P m (k)·(1-η mppt ) ⑤,

[0064] Among them, P m (k) Take the maximum output power when the wind speed is cut in. When the wind speed is cut in, k=0, that is, P m (k)=P m (0); setPd(k) To adjust the coefficient, the value range is (0,1], and then it can be adjusted according to P m (k) the size is adjusted appropriately; η mppt is the maximum power tracking efficiency achieved by the expected target, then the value of setPd(0) is obtained by formula ...

Embodiment 2

[0103] The method of using a 150W vertical axis wind power generating set and maximum power tracking control based on wind power generation is the same as in embodiment 1, and specifically includes the following steps:

[0104] Step 1: Initialize, obtain the initial speed of the fan ω(0), set the stop power tracking threshold setPd(0)=1.5W, adjust the frequency f(0)=5, the initial step size Step(0)=15, the minimum speed Adjust the threshold setSd=0RPM and the duration of different dynamic intervals T=135s, the stop power tracking threshold setPd(0) is obtained according to the formula ⑤:

[0105] setPd(k)=λ setPd(k) ·P m (k)·(1-η mppt ) ⑤,

[0106] Among them, P m (k) Take the maximum output power when the wind speed is cut in. When the wind speed is cut in, k=0, that is, P m (k)=P m (0)=5.0W; λ setPd(k) To adjust the coefficient, the value is 1, and then according to P m (k) the size is adjusted appropriately; η mppt The maximum power tracking efficiency achieved for...

technical field

[0001] The invention relates to the field of wind power generation, in particular to a method for maximum power tracking control based on wind power generation. Background technique

[0002] As the energy crisis becomes more and more obvious around the world, the development of renewable energy has become a major measure of the energy development strategies of countries all over the world. Due to its huge global reserves, renewable, wide distribution, and non-polluting characteristics, wind power has become a widely researched renewable energy. How to capture wind energy with maximum efficiency is a key issue in wind power research.

[0003] The commonly used maximum power tracking (MPPT) control methods in variable speed constant frequency wind power generation systems include tip speed ratio method, hill climbing method optimal control and power curve method. Since the power curve method is based on the maximum power curve of the wind turbine, different s...

Examples

Embodiment 1

[0061] A method of maximum power tracking control based on wind power generation, see figure 1 , including the following steps:

[0062] Step 1: Initialize, obtain the initial speed ω(0) of the fan, set the stop power tracking threshold setPd(0), adjust the frequency f(0), the initial step size Step(0), the minimum speed adjustment threshold setSd and the dynamic interval are different The time period is T, and the stop power tracking threshold setPd(0) is obtained according to the formula ⑤:

[0063] setPd(k)=λ setPd(k) ·P m (k)·(1-η mppt ) ⑤,

[0064] Among them, P m (k) Take the maximum output power when the wind speed is cut in. When the wind speed is cut in, k=0, that is, P m (k)=P m (0); setPd(k) To adjust the coefficient, the value range is (0,1], and then it can be adjusted according to P m (k) the size is adjusted appropriately; η mppt is the maximum power tracking efficiency achieved by the expected target, then the value of setPd(0) is obtained by formula ...

Embodiment 2

[0103] The method of using a 150W vertical axis wind power generating set and maximum power tracking control based on wind power generation is the same as in embodiment 1, and specifically includes the following steps:

[0104] Step 1: Initialize, obtain the initial speed of the fan ω(0), set the stop power tracking threshold setPd(0)=1.5W, adjust the frequency f(0)=5, the initial step size Step(0)=15, the minimum speed Adjust the threshold setSd=0RPM and the duration of different dynamic intervals T=135s, the stop power tracking threshold setPd(0) is obtained according to the formula ⑤:

[0105] setPd(k)=λ setPd(k) ·P m (k)·(1-η mppt ) ⑤,

[0106] Among them, P m (k) Take the maximum output power when the wind speed is cut in. When the wind speed is cut in, k=0, that is, P m (k)=P m (0)=5.0W; λ setPd(k) To adjust the coefficient, the value is 1, and then according to P m (k) the size is adjusted appropriately; η mppt The maximum power tracking efficiency achieved for...

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