Super-capacitor overvoltage protection control system of variable pitch control system

Abstract

The invention relates to a super-capacitor overvoltage protection control system of a variable pitch control system. The super-capacitor overvoltage protection control system comprises a sensor, a controller and a rectifier, the sensor is used for monitoring parameters of voltage, speed and torque of a direct-current bus and transmitting the parameters to the controller; the controller receives the detected parameters, performs logic judgment according to a preset condition, judges whether the overvoltage of the power grid occurs or not, and correspondingly controls the operation state of the rectifier; the rectifier is used for controlling storage and release of electric energy. The method can effectively prevent the system and equipment from being damaged by the overvoltage of the power grid, and has the advantage of ensuring the safe and stable operation of the wind generating set.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power generation, and in particular to a supercapacitor overvoltage protection control system of a variable pitch control system. Background Art

[0002] The variable pitch control system in the wind power generation system usually uses supercapacitors as energy storage devices to balance the grid voltage fluctuations and wind energy changes. However, in some cases, such as grid overvoltage, the supercapacitor may be affected by excessive voltage, causing it to be damaged. Therefore, an effective control system is needed to protect the supercapacitor and ensure the stable operation of the wind power generation system. Summary of the invention

[0003] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by this patent application is how to provide a supercapacitor overvoltage protection control system for a variable pitch control system that effectively prevents damage to the system and equipment caused by overvoltage in the power grid and ensures the safe and stable operation of the wind turbine generator set.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A supercapacitor overvoltage protection control system for a pitch control system, comprising a sensor, a controller and a rectifier;

[0006] The sensor is used to monitor the parameters of DC bus voltage, speed and torque, and transmit the parameters to the controller;

[0007] The controller receives the detected parameters, performs logical judgment according to preset conditions, determines whether the grid is over-voltage, and controls the operating state of the rectifier accordingly;

[0008] The rectifier is used to control the storage and release of electric energy.

[0009] As an optimization, the controller determines whether the grid is over-voltage based on the following conditions: the DC bus voltage is between 750-770V, and the speed and torque have no reverse pull and last for more than 5 seconds.

[0010] As an optimization, the controller determines whether the grid is over-voltage based on the following conditions: or the DC bus voltage is between 770-780V, and the speed and torque have no reverse pull and exceed 1 second.

[0011] As an optimization, when the controller determines that the grid is over-voltage, the thyristor of the rectifier is disconnected and the pre-charging function of the rectifier is disabled.

[0012] As an optimization, when the DC bus voltage is lower than 350V or a reset occurs, the controller will turn on the thyristor of the rectifier and enable the pre-charging function of the rectifier.

[0013] To sum up, the supercapacitor overvoltage protection control system of the pitch control system described in this scheme can effectively prevent the damage of the system and equipment to the system by overvoltage of the power grid through reasonable logical judgment and control methods, and ensure the safe and stable operation of the wind turbine. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a framework diagram of a supercapacitor overvoltage protection control system of a pitch control system described in the present invention.

[0015] Figure 2 This is a control strategy diagram of the supercapacitor overvoltage protection control system of the pitch control system described in the present invention. DETAILED DESCRIPTION

[0016] The present invention is further described in detail below in conjunction with the accompanying drawings. In the description of the present invention, it should be understood that the directions or positional relationships indicated by directional words such as "upper, lower" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description. Unless otherwise stated, these directional words do not indicate or imply that the devices or components referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0017] like Figure 1-2 As shown, a supercapacitor overvoltage protection control system of a pitch control system includes a sensor, a controller and a rectifier;

[0018] The sensor is used to monitor the parameters of DC bus voltage, speed and torque, and transmit the parameters to the controller;

[0019] The controller receives the detected parameters, performs logical judgment according to preset conditions, determines whether the grid is over-voltage, and controls the operating state of the rectifier accordingly;

[0020] The rectifier is used to control the storage and release of electric energy.

[0021] In this embodiment, the controller determines whether the grid is over-voltage based on the following conditions: the DC bus voltage is between 750V and 770V, and the speed and torque have no reverse pull and last for more than 5 seconds.

[0022] In this embodiment, the controller determines whether the grid is over-voltage based on the following conditions: or the DC bus voltage is between 770-780V, and the speed and torque have no reverse pull and last for more than 1 second.

[0023] In this embodiment, when the controller determines that the grid is over-voltage, the thyristor of the rectifier is disconnected and the pre-charging function of the rectifier is disabled.

[0024] This prevents excessive voltage from damaging the system and equipment and protects the supercapacitor from overvoltage damage.

[0025] In this embodiment, when the DC bus voltage is lower than 350V or a reset occurs, the controller turns on the thyristor of the rectifier and enables the pre-charging function of the rectifier.

[0026] In this way, the normal startup and stable operation of the system are ensured.

[0027] Specifically, the controller uses logical judgment to control in order to ensure the safe operation of the system. The controller performs logical judgment based on preset conditions and real-time feedback data to determine whether overvoltage protection is required and performs control operations accordingly. Logical judgment can be implemented using programming technology, and the control strategy is implemented by writing corresponding algorithms and logical rules.

[0028] Through these measures, the present invention realizes overvoltage protection for supercapacitors and ensures the stable operation of wind power generation systems. The specific implementation methods can be adjusted and optimized according to actual needs to adapt to the requirements of different wind power generation systems. It can effectively prevent the damage of power grid overvoltage to the system and equipment and ensure the safe and stable operation of wind turbines.

[0029] Finally, it should be noted that those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A supercapacitor overvoltage protection control system for a pitch control system, characterized in that: Includes sensors, controllers and rectifiers; The sensor is used to monitor the parameters of DC bus voltage, speed and torque, and transmit the parameters to the controller; The controller receives the detected parameters, performs logical judgment according to preset conditions, determines whether the grid is over-voltage, and controls the operating state of the rectifier accordingly; The rectifier is used to control the storage and release of electric energy.

2. The supercapacitor overvoltage protection control system of a pitch control system according to claim 1, characterized in that: The controller determines whether the grid is over-voltage based on the following conditions: the DC bus voltage is between 750-770V, and the speed and torque are not reversed for more than 5 seconds.

3. The supercapacitor overvoltage protection control system of a pitch control system according to claim 1, characterized in that: The controller determines whether the grid is over-voltage under the following conditions: the DC bus voltage is between 770 and 780 V, and the speed and torque are not reversed for more than 1 second.

4. The supercapacitor overvoltage protection control system of a pitch control system according to claim 2 or 3, characterized in that: When the controller determines that the grid is over-voltage, the thyristor of the rectifier is disconnected and the pre-charging function of the rectifier is disabled.

5. The supercapacitor overvoltage protection control system of a pitch control system according to claim 4, characterized in that: When the DC bus voltage is lower than 350V or a reset occurs, the controller will turn on the thyristor of the rectifier and enable the pre-charging function of the rectifier.

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