CN115929540A - Pitch control method for wind turbines - Google Patents

Abstract

A pitch control method for a wind power generating set. In the wind turbine, since the hub of the pitch system rotates with the impeller, while the nacelle is fixed, the conductive slip ring is one of the indispensable components in the wind turbine. The composition of the present invention includes: a main control controller, multiple pitch controllers and a slip ring, the slip ring includes multiple communication channels, and the multiple communication channels respectively connect the main control controller and the pitch control Each connection in the controller for data communication. The invention is used for the pitch control of the wind power generating set.

Description

Pitch control method for wind turbines

technical field

The invention relates to a pitch control method of a wind power generating set.

Background technique

A wind turbine is a device that converts wind energy into electrical energy. In the control of wind turbines, pitch control is the main link. In the wind turbine, since the hub of the pitch system rotates with the impeller, while the nacelle is fixed, the conductive slip ring is one of the indispensable components in the wind turbine.

Contents of the invention

The purpose of the present invention is to provide a pitch control method of a wind power generating set.

The above purpose is achieved through the following schemes:

A pitch control method for a wind power generating set, wherein the pitch controller includes: a master controller, multiple pitch controllers and a slip ring, the slip ring includes multiple communication channels, and the multiple communication channels The channel respectively connects the main control controller with each of the pitch controllers for data communication;

The method includes the following steps: the main control controller determines whether a single-axis communication failure occurs in the wind power generating set;

The main controller of the wind power generating set predicts the pitch control data of each control cycle in the advance preset time period;

The main controller generates a corresponding predicted pitch control command according to the pitch control data, and sends the predicted pitch control command to the pitch controller, so that the pitch controller stores the ;

If the conductive slip ring communication is interrupted, the pitch controller sequentially executes the predicted pitch control commands according to the storage order of the predicted pitch control commands, so as to perform the pitch operation.

In the pitch control method of the wind power generating set, the pitch controller is configured as:

A predictive pitch control command receiving unit, a predictive pitch control command storage unit and a control unit;

When it is detected that the level of the relay in the first safety chain is a low level and the level of the relay in the second safety chain is a high level, control the pitch control system to perform a pitch retracting operation at a predetermined speed;

When it is detected that the levels of the relays in the first safety chain and the second safety chain are at a high level, the pitch control system is controlled to perform a propeller opening operation at a predetermined speed.

In the pitch control method of the wind power generating set, the main controller further includes:

A real-time pitch angle calculation unit and a real-time pitch control command generation unit;

The control unit of the pitch controller is also used to control and execute the pitch control operation according to the real-time pitch control command when the conductive slip ring communication is not interrupted, and determine whether the redundant operation mode expires; when the redundant operation mode expires During the period, determine whether the single-axis communication failure returns to normal.

Beneficial effect:

1. Since the present invention stores the pitch control command within the preset time period in advance, even if the conductive slip ring communication is interrupted, the blades can be controlled to perform the pitch operation according to the stored pitch control command, and wind power generation can be avoided. Unnecessary stoppage of the unit improves the power generation of the wind power generation unit.

2. The present invention can control the pitch adjustment direction of the wind power generator through the type of the level signal of the safety chain hardware during redundant operation when a communication fault occurs, and avoid immediate triggering of faults due to the blade pitch control.

Detailed ways:

Example 1:

A pitch control method for a wind power generating set, wherein the pitch controller includes: a main control controller, multiple pitch controllers and a slip ring, the slip ring includes multiple communication channels, and the multiple communication channels The channel respectively connects the main control controller with each of the pitch controllers for data communication;

The method includes the following steps: the main control controller determines whether a single-axis communication failure occurs in the wind power generating set;

The main controller of the wind power generating set predicts the pitch control data of each control cycle in the advance preset time period;

The main controller generates a corresponding predicted pitch control command according to the pitch control data, and sends the predicted pitch control command to the pitch controller, so that the pitch controller stores the ;

If the conductive slip ring communication is interrupted, the pitch controller sequentially executes the predicted pitch control instructions according to the storage order of the predicted pitch control instructions, so as to perform the pitch operation.

Example 2:

According to the pitch control method of the wind power generating set described in Embodiment 1, the pitch controller is configured to:

A predictive pitch control command receiving unit, a predictive pitch control command storage unit and a control unit;

When it is detected that the level of the relay in the first safety chain is a low level and the level of the relay in the second safety chain is a high level, control the pitch control system to perform a pitch retracting operation at a predetermined speed;

When it is detected that the levels of the relays in the first safety chain and the second safety chain are at a high level, the pitch control system is controlled to perform a propeller opening operation at a predetermined speed.

Example 3:

According to the pitch control method of the wind power generating set described in embodiment 1 or 2, the main controller further includes:

A real-time pitch angle calculation unit and a real-time pitch control command generation unit;

The control unit of the pitch controller is also used to control and execute the pitch control operation according to the real-time pitch control command when the conductive slip ring communication is not interrupted, and determine whether the redundant operation mode expires; when the redundant operation mode expires During the period, determine whether the single-axis communication failure returns to normal.

Claims (3)

1. A variable pitch control method of a wind generating set is characterized by comprising the following steps: its variable pitch controller includes: the slip ring comprises a plurality of communication channels, and the communication channels are used for respectively connecting the master controller with each of the variable pitch controllers so as to carry out data communication;

the method comprises the following steps: the method comprises the steps that a master control controller determines whether a single-shaft communication fault occurs in a wind generating set;

a main controller of the wind generating set predicts the variable pitch control data of each control period in advance of a preset time period;

the main controller generates a corresponding prediction variable pitch control instruction according to the variable pitch control data and sends the prediction variable pitch control instruction to a variable pitch controller so that the variable pitch controller stores the prediction variable pitch control instruction according to a receiving sequence;

and if the communication of the conductive slip ring is interrupted, the variable pitch controller sequentially executes the prediction variable pitch control instructions according to the storage sequence of the prediction variable pitch control instructions so as to perform variable pitch operation.

2. The pitch control method of a wind turbine generator set according to claim 1, wherein: the pitch controller is configured to:

the device comprises a prediction variable pitch control instruction receiving unit, a prediction variable pitch control instruction storage unit and a control unit;

when the level of a relay in the first safety chain is detected to be low level and the level of a relay in the second safety chain is detected to be high level, controlling the variable pitch system to execute a pitch-withdrawing operation at a preset speed;

and when detecting that the electrical levels of the relays in the first safety chain and the second safety chain are high levels, controlling the variable pitch system to execute the pitching operation at a preset speed.

3. The pitch control method of a wind turbine generator set according to claim 2, wherein: the main controller further comprises:

the real-time pitch angle calculation unit and the real-time pitch control instruction generation unit;

the control unit of the variable-pitch controller is also used for controlling and executing variable-pitch control operation according to the real-time variable-pitch control instruction when the communication of the conductive slip ring is not interrupted, and determining whether the redundant operation mode is due; when the redundant mode of operation expires, determining whether the single-axis communication failure is back to normal.