Commercial power variable pitch device preferentially used for high-grade fault of wind turbine generator

Abstract

The utility model belongs to the field of wind power, and provides a wind turbine generator set high-grade fault preferential mains supply variable pitch device, and a variable pitch system hardware design part of the variable pitch device comprises a main control system, a variable pitch controller, an operation switching control relay, a watchdog module, a storage battery pitch collecting loop, a servo pitch collecting loop and a pitch collecting module, three independent operation switching control relays 12K3, 13K3 and 14K3 are arranged through the design of an EFC loop of a variable pitch control cabinet, main control and variable pitch system programs and control strategies are optimized at the same time, finally, a working power supply can be preferentially used for executing variable pitch actions, a variable pitch battery standby power supply only supplies power to collect the pitch under the condition that the working power supply is lost, and the working power supply is not lost. And the original safety function of the unit is not influenced after transformation, and meanwhile, the power supply stability and reliability of a variable pitch system of the unit and the safety operation stability of the unit are greatly improved.

Description

Technical Field

[0001] This utility model belongs to the field of wind power, and in particular relates to a wind turbine generator that prioritizes the use of mains power pitch control during high-level faults. Background Technology

[0002] Currently, the wind turbines used in the Wuride wind and solar power farm are Dongqi FD82B-1500 doubly fed wind turbines. The pitch system's backup power for blade retraction is a lead-acid battery. When the unit experiences a high-level fault (braking level 180 or higher), the entire unit retracts the blades via the battery. It lacks the function of having a backup power supply that only provides power when the mains power is lost, and it cannot prioritize using mains power for blade retraction. Whether the pitch system uses mains power for blade retraction depends primarily on the EFC (Emergency Pitch Control) signal in the main control system. If this signal is high, the 5K3 relay in the pitch system is energized, and the pitch system uses mains power for blade opening or retraction. Conversely, it uses the backup power for blade retraction. When the unit experiences a fault with a braking level greater than or equal to 180, the main control hardware disconnects the EFC (Emergency Pitch Control) signal. This design principle poses a safety hazard. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model proposes a wind turbine pitch control device that prioritizes the use of mains power during high-level faults. This solves the technical problems in existing technologies, such as the inability to prioritize the use of the working power supply for pitch control and how to ensure that the backup power supply of the pitch control battery only supplies power for pitch control when the working power supply is lost.

[0004] The technical solution adopted in this utility model is as follows:

[0005] A high-level fault in a wind turbine generator prioritizes the use of a mains-powered pitch control system. The hardware design of this system includes a main control system, a pitch controller, operation switching control relays, a watchdog module, a battery-powered pitch recovery circuit, a servo-powered pitch recovery circuit, and a pitch recovery module. The main control EFC signal is connected to the pitch controller, which consists of three independent operation switching control relays (12K3 / 13K3 / 14K3). The entire servo-powered pitch recovery circuit is controlled by a 5K3 relay in the shaft control cabinet. Monitoring points are set at its front end, including a watchdog module judgment point, a slip ring overspeed judgment point, a pitch controller judgment point, and a servo driver hardware fault judgment point. To adapt to the hardware configuration and control logic, the pitch controller software is programmed to add corresponding DI (digital input) and DO (digital output) monitoring to the pitch debugging software. Panel and remote monitoring software are also developed to update fault prompts according to the communication protocol.

[0006] Specifically, the control logic is explained as follows:

[0007] 1. Under normal communication between the main controller and the pitch control, normal EFC signal of the main controller hardware and software, and normal BTB OK signal of the driver, the pitch controller can adjust the pitch according to the wind turbine's main command.

[0008] 2. When there is an abnormal communication between the main controller and the pitch control || an abnormal EFC signal in the main controller hardware || an abnormal EFC signal in the main controller software && the BTB OK signal of the driver is normal, the pitch controller enters the pre-retardation mode. According to the internal preset speed curve, that is, the speed curve is consistent with the wind turbine main controller setting curve, the driver is controlled to complete the pitch retardation action.

[0009] 3. In non-backup power supply testing, if the driver BTB OK signal is abnormal and the propeller retraction is too slow after entering the pre-retraction mode, the judgment condition is: if the 92° limit switch of any blade is not triggered within 18 seconds or the speed of any blade is determined to be less than 2.5° / s after a delay of 600ms, the pitch controller controls the corresponding DO to disconnect, and the pitch switches to battery retraction. In backup power supply testing, the pitch receiver receives the backup power supply test position and disconnects the DO of the three 12K3 / 13K3 / 14K3 relays. The DO is restored after the backup power supply test is completed.

[0010] 4. The pitch system has a watchdog module hardware circuit. If the pitch controller malfunctions or the slip ring overspeeds, the hardware will switch to battery-powered direct pitch retraction.

[0011] 5. The servo drive OK signal is changed from the small fault circuit to the running switching circuit, and the axis with servo drive failure is directly switched to battery propeller take-off.

[0012] The beneficial effects of this utility model are: by directly connecting the EFC signal of the main control system to the pitch controller and setting up three independent operation switching control relays, the main control and pitch system programs and control strategies are optimized, so that when the unit encounters a high-level fault of braking level 180 or above, the working power supply can be used first to perform pitch action, while the pitch battery backup power supply is only used to power the pitch control when the working power supply is lost, which greatly improves the power supply stability and reliability of the unit's pitch system.

[0013] Advantages of the present invention in additional aspects will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0014] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model.

[0015] Figure 1This is a diagram of the pitch EFC circuit modification for this utility model;

[0016] Figure 2 This is the circuit diagram of the main control EFC connected to the pitch controller of this utility model;

[0017] Figure 3 This is the circuit diagram for the pitch controller of this utility model.

[0018] Figure 4 This is the operation switching control loop diagram of this utility model. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0021] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to the present invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0022] In this utility model, terms such as "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "side", and "bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used to facilitate the description of the structural relationship between the various components or elements of this utility model and do not specifically refer to any component or element in this utility model. They should not be construed as limiting this utility model.

[0023] In this utility model, terms such as "fixed connection," "connected," and "joined" should be interpreted broadly, indicating a fixed connection, an integral connection, or a detachable connection; a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in this utility model can be determined according to the specific circumstances, and should not be construed as a limitation of this utility model.

[0024] like Figures 1-4As shown, this embodiment provides a wind turbine pitch control device that prioritizes mains power during high-level faults. The hardware design of the pitch control device includes a main control system, a pitch controller, a running switching control relay, a watchdog module, a battery pitch recovery circuit, and a pitch recovery module. The entry point of the EFC circuit from the main control system to the pitch control system is set so that the EFC signal of the main control system is directly connected to the pitch controller. Under normal circumstances, the main control system sends a low-level EFC signal, and the pitch control system operates normally according to the instructions of the main control system. When the main control system detects a high-level fault and sends a high-level EFC signal, the pitch controller receives this signal and executes an emergency pitch recovery action according to the preset control strategy.

[0025] The pitch controller is configured with three independent operation switching control relays 12K3, 13K3, and 14K3. The internal logic circuit of the pitch controller determines whether to perform a pitch recovery action based on the input signal. If the communication between the main controller and the pitch controller, the main controller hardware EFC signal, or the main controller software EFC signal is abnormal but the driver BTBOK signal is normal, the pitch controller will enter the pre-pitch recovery mode and control the driver to complete the pitch recovery action according to the preset speed curve. In non-backup power supply testing, if the driver BTBOK signal is abnormal or the pitch recovery is too slow, the pitch controller will switch to battery pitch recovery. The battery pitch recovery circuit is controlled by relay 5K6 in the shaft control cabinet. In backup power supply testing, the pitch controller will disconnect the relay control DO according to the main control signal and restore it after the test to achieve independent control of the three sides.

[0026] The pitch control module includes a servo pitch control circuit, which is controlled by a 5K3 relay in the shaft control cabinet. Monitoring points are set at its front end, including a watchdog module, slip ring overspeed detection, and hardware fault detection points for the pitch controller and servo drive. This ensures accurate system status assessment and appropriate pitch control actions in emergencies. An output contact of a safety relay K2 is provided between the internal safety chain and the pitch safety chain feedback terminal on the wind turbine slip ring. Slip ring overspeed is detected using the pitch safety chain. Hardware fault detection points for the pitch controller and servo drive are obtained by periodically sending signals and receiving feedback. If the feedback is untimely or the feedback data is abnormal, a fault can be identified.

[0027] like Figure 4 As shown, the operation switching control relay uses the 12K3, 13K3, and 14K3 contacts in the central control cabinet to control the three axis control cabinets respectively. The three axis control cabinets are equipped with 3A1-2X, 5K6, and 6K1 contacts in sequence, and are connected to resistors and interface circuits.

[0028] The watchdog module uses a CPLD equipped with an EF2L15LG100B chip. CPLD (Complex Programmable Logic Device) is a more complex logic element than PLD. It is a digital integrated circuit that users can construct logic functions according to their own needs. It has the characteristics of strong programmability, abundant logic resources, and low power consumption, making it very suitable for implementing complex monitoring logic. Specifically, in the design of this embodiment, the watchdog module is configured to send heartbeat signals to the pitch controller at regular intervals. When the pitch controller is operating normally, it will respond to the heartbeat signal on time. If the pitch controller malfunctions or crashes and cannot respond to the heartbeat signal in time, the watchdog module will trigger a reset operation, restoring the pitch controller to its initial state.

[0029] In addition, the main controller adds software EFC and backup power test commands, the pitch upload adds a main controller software EFC or hardware EFC loss prompt, the pitch debugging software sets DI and DO monitoring, and the panel and remote monitoring software update fault prompts according to the communication protocol.

[0030] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A wind turbine generator with a high-level fault priority for mains power pitch control, characterized in that: The hardware design of the pitch system of this device includes: a main control system, a pitch controller, a run-switching control relay, a watchdog module, a battery-powered pitch recovery circuit, and a servo pitch recovery circuit. The main control system's main control EFC signal is connected to the pitch controller. The pitch controller disconnects the relay to control DO according to the main control signal and restores it after the test to achieve independent control of the three sides. Three independent run-switching control relays are set accordingly. The entire servo pitch recovery circuit is set to be controlled by the 5K3 relay in the shaft control cabinet, and a monitoring point is set at the front end.

2. The wind turbine high-level fault priority use mains power pitch control device as described in claim 1, characterized in that, The operation switching control relays are 12K3, 13K3, and 14K3.

3. The wind turbine high-level fault priority use mains power pitch control device as described in claim 1, characterized in that, The monitoring points include the watchdog module, slip ring overspeed, pitch controller, and servo driver hardware fault detection points.

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