Yaw control system in safety chain triggering state of wind generating set
By combining safety chain signal decoupling, dynamic yaw command generation, and timing optimization modules, the problem of yaw system lockup when the safety chain is triggered in wind turbine generators is solved, realizing dynamic response and protection functions under extreme operating conditions, and improving the reliability and compatibility of the system.
Patent Information
- Application Number
- CN202510988441.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-17
- Publication Date
- 2025-10-28
AI Technical Summary
Existing wind turbine generators have a locked yaw system when the safety chain is triggered, making it impossible to actively adjust the windward angle. This results in the blades bearing asymmetrical loads, which accelerates transmission system fatigue and may even lead to structural failure over long-term operation. Furthermore, existing solutions have slow response speeds and poor compatibility, which may cause control logic conflicts.
The safety chain signal decoupling module is used to split the main safety chain signal into the main safety chain signal and the yaw enable signal. After processing through the logic AND gate, the signal is input into the yaw control unit to generate a dynamic yaw command. When the safety chain is triggered, the system is downgraded to the emergency yaw mode. Combined with the timing optimization module, the pressure relief, delayed release and start-up timing of the electromagnetic brake are controlled. The hardware adaptation module selects the appropriate hardware modification solution according to the controller model.
It enables phased yaw control to be performed even when the safety chain is triggered, thus maintaining the protection function and achieving dynamic response. This significantly reduces the peak mechanical load under extreme conditions, improves the system's response speed and compatibility, and avoids the risk of equipment damage.
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Figure CN120845249A_ABST
Abstract
Description
Technical Field
[0001] The embodiments in this specification relate to the field of equipment operation and maintenance technology, and in particular to the yaw control system of a wind turbine generator set under the safety chain triggering state. Background Technology
[0002] When the safety chain of a conventional wind turbine is triggered, the yaw system immediately locks to prevent further damage. However, this design has significant flaws. When encountering extreme wind direction changes (such as typhoons or sudden gusts), the locked yaw system cannot actively adjust its angle to the wind, causing the blades to bear asymmetrical loads. Long-term operation will accelerate transmission system fatigue and may even lead to structural failure. Existing solutions mostly employ hardware bypass or software delay strategies, but these methods suffer from slow response times, poor compatibility, and may cause control logic conflicts.
[0003] Therefore, a better solution is urgently needed. Summary of the Invention
[0004] In view of this, the embodiments of this specification provide a yaw control system for wind turbine generators under the safety chain trigger state, in order to solve the technical defects existing in the prior art.
[0005] According to a first aspect of the embodiments of this specification, a yaw control system for a wind turbine generator set under a safety chain triggered state is provided, comprising:
[0006] The safety chain signal decoupling module is used to split the unit's main safety chain signal into a main safety chain signal and a yaw enable signal. The main safety chain signal maintains its original protection function, while the yaw enable signal is processed by a logic AND gate and then input to the yaw control unit.
[0007] The yaw control command generation module is used to generate dynamic yaw commands based on wind direction sensor data and unit status data, and downgrade to emergency yaw mode when the safety chain is triggered.
[0008] The timing optimization module is used to control the pressure relief, delayed release, and start-up timing of the electromagnetic brake;
[0009] The hardware adaptation module is used to select the appropriate hardware modification scheme based on the controller model.
[0010] In one possible implementation, the safety chain signal decoupling module achieves physical signal separation through a group of relays, and the logic AND gate is designed to allow yaw action only when the main safety chain is not triggered and the external wind direction is abnormal.
[0011] In emergency mode, the yaw control command generation module only performs yaw adjustments to avoid extreme loads.
[0012] In one possible implementation, the electromagnetic brake control timing of the timing optimization module includes a depressurization phase, a delayed release phase, and a start-up phase, wherein the depressurization phase lasts for 1.5 seconds, the delayed release phase lasts for 0.8 seconds, and the start-up phase is a soft start of the motor torque at 10% of the rated torque.
[0013] The hardware adaptation module adds an expansion module for the EL2008 model and remaps the channel function for the EL2809 model.
[0014] In one possible implementation, the system is forced to enter bypass state when the safety chain is triggered, and the yaw action must meet the following conditions: the wind direction change angular velocity exceeds 5° / s and the unit vibration value is lower than the protection threshold.
[0015] In bypass mode, yaw commands have lower priority than in normal mode.
[0016] In one possible implementation, the EL2008 model modification scheme for the hardware adapter module includes adding components such as circuit breaker F42.2 and contactor K110.1, and reconstructing the electromagnetic brake power supply circuit;
[0017] The EL2809 model upgrade plan reuses existing cables, only replacing the electromagnetic brake power supply cable.
[0018] In one possible implementation, the method for generating yaw commands in emergency yaw mode includes:
[0019] Obtain real-time wind direction angular velocity Δθ and unit vibration value V;
[0020] When Δθ > 5° / s and V < protection threshold, a fine-tuning yaw command is generated;
[0021] If the conditions are not met, the yaw system remains locked.
[0022] In one possible implementation, the dynamic adjustment magnitude Δα of the yaw command is calculated using the following formula:
[0023] Δα=k1·Δθ+k2·(Vmax-V);
[0024] Where k1 is the wind direction angular velocity weighting coefficient, k2 is the vibration compensation coefficient, and Vmax is the maximum allowable vibration value;
[0025] The value of Δα is limited to [-3°, 3°], and values outside this range are treated as amplitude limits.
[0026] In one possible implementation, the timing optimization module detects the hydraulic system pressure P at the end of the depressurization phase. If P > threshold P0, the depressurization time is extended until P ≤ P0.
[0027] The value of P0 is dynamically adjusted according to the gearbox model and rated torque.
[0028] In one possible implementation, the relationship between the pressure relief time T and the pressure P is calculated using the following formula:
[0029] T_relief = T_0 + k_3 * (P - P_0);
[0030] Where T0 is the baseline depressurization time of 1.5 seconds, and k3 is the pressure correction factor;
[0031] When P≤P0, the delayed release phase begins.
[0032] In one possible implementation, the success rate S of the yaw maneuver in bypass mode is evaluated using the following formula:
[0033] S = Σ(Number of successful actions) / Σ(Total number of triggers) × 100%;
[0034] Among them, the number of successful actions refers to the number of times the yaw command is executed if Δθ>5° / s and V<protection threshold is met, and the total number of triggers is the total number of safety chain triggers.
[0035] The statistical period for S is 30 consecutive days of running data.
[0036] This specification provides an embodiment of a yaw control system for wind turbine generators under safety chain triggering conditions, including: a safety chain signal decoupling module, used to split the main safety chain signal of the generator into a main safety chain signal and a yaw enable signal. The main safety chain signal maintains its original protection function, while the yaw enable signal is processed by a logic AND gate and then input to the yaw control unit; a yaw control command generation module, used to generate dynamic yaw commands based on wind direction sensor data and generator status data, and downgrade to emergency yaw mode when the safety chain is triggered; a timing optimization module, used to control the depressurization, delayed release, and start-up timing of the electromagnetic brake; and a hardware adaptation module, used to select a suitable hardware modification scheme according to the controller model. Through the timing optimization module of this solution, staged yaw control can still be executed when the safety chain is triggered, maintaining the protection function while achieving dynamic response, filling a technological gap in the industry. Attached Figure Description
[0037] Figure 1 This is a schematic diagram of a yaw control system for a wind turbine generator set under a safety chain trigger state, provided in one embodiment of this specification. Detailed Implementation
[0038] The following description sets forth many specific details to facilitate a thorough understanding of this specification. However, this specification can be implemented in many other ways than those described herein, and those skilled in the art can make similar generalizations without violating the scope of this specification. Therefore, this specification is not limited to the specific implementations disclosed below.
[0039] The terms used in one or more embodiments of this specification are for the purpose of describing specific embodiments only and are not intended to limit one or more embodiments of this specification. The singular forms "a," "an," and "the" used in one or more embodiments of this specification and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used in one or more embodiments of this specification refers to and includes any or all possible combinations of one or more associated listed items.
[0040] It should be understood that although the terms first, second, etc. may be used to describe various information in one or more embodiments of this specification, such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of one or more embodiments of this specification, the first may also be referred to as the second, and similarly, the second may also be referred to as the first. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining".
[0041] This specification provides a yaw control system for wind turbine generators under safety chain triggered conditions, which will be described in detail in the following embodiments.
[0042] See Figure 1 , Figure 1 This document illustrates a schematic diagram of a yaw control system for a wind turbine generator set under a safety chain triggered state, according to an embodiment of this specification. Specifically, it includes: a safety chain signal decoupling module, used to split the main safety chain signal of the generator set into a main safety chain signal and a yaw enable signal. The main safety chain signal maintains its original protection function, while the yaw enable signal is processed by a logic AND gate and then input to the yaw control unit; a yaw control command generation module, used to generate dynamic yaw commands based on wind direction sensor data and generator set status data, and downgrade to emergency yaw mode when the safety chain is triggered; a timing optimization module, used to control the depressurization, delayed release, and start-up timing of the electromagnetic brake; and a hardware adaptation module, used to select an appropriate hardware modification scheme based on the controller model.
[0043] The safety chain signal decoupling module refers to a hardware / software system that splits the original safety chain signal into a main protection signal and a yaw control signal, used to maintain limited functionality of the yaw system when the safety chain is triggered. The yaw control command generation module refers to an algorithm unit that generates yaw action commands based on real-time data, used to output differentiated control strategies in normal and emergency modes. The timing optimization module refers to a logic unit that controls the timing of electromagnetic brake actions, used to reduce mechanical shock through staged control. The hardware adaptation module refers to a set of modification schemes for different controller models, used to achieve system compatibility support for different models.
[0044] As a concrete example, taking the EL2809 wind turbine as an example, when the wind speed reaches 28m / s and triggers the safety chain: the safety chain signal decoupling module splits the original signal into a main protection signal (triggering an emergency shutdown) and a yaw enable signal (allowing emergency yaw). The yaw control command generation module detects a sudden change in wind direction with an angular velocity of 6° / s and generates an emergency yaw command, causing the unit to fine-tune its wind angle at a rate of 5° / s. The timing optimization module executes the process of "pressure relief for 1.2 seconds → brake release with a delay of 0.9 seconds → soft start of the motor with 10% torque" to avoid gearbox impact. The hardware adaptation module reuses existing cables through the remapping channel #11 function, completing the modification by only replacing the brake power supply line.
[0045] This system maintains necessary yaw adjustment capability even when the safety chain is triggered, significantly reducing peak mechanical loads under extreme conditions. Through signal decoupling and timing optimization, it retains safety protection functions while avoiding the equipment damage risks caused by traditional lock-up mechanisms. The hardware adaptability design supports rapid retrofitting of mainstream models, improving system reliability without replacing the core controller. The emergency yaw mode actively adjusts the windward angle during sudden wind changes, effectively extending the lifespan of the transmission system.
[0046] In one possible implementation, the safety chain signal decoupling module achieves physical signal separation through a relay group, and the logic AND gate is designed to allow yaw action only when the main safety chain is not triggered and the external wind direction is abnormal; the yaw control command generation module only performs yaw adjustments to avoid extreme loads in emergency mode.
[0047] Here, a relay group can refer to a physical signal switching unit composed of multiple electromagnetic relays, used to achieve hard-wired separation of the safety chain signal. A logic AND gate can refer to a signal filtering circuit based on Boolean operations, used to activate the yaw function when both conditions (normal main safety chain and abnormal wind direction) are met.
[0048] As a specific example, when the EL2809 unit encounters a sudden gust of wind: the relay group splits the safety chain signal into two independent paths. The main signal is directly connected to the emergency shutdown circuit, and the yaw signal is processed by a logic AND gate. The logic AND gate detects that the main safety chain has not been triggered (signal A is high) and the sudden change in wind direction exceeds the threshold angular velocity (signal B is low), and outputs an enable signal to the yaw controller. In emergency mode, the yaw control command generation module only drives the unit to adjust the wind angle at a rate of 3° / s to avoid overloading the transmission system.
[0049] This solution ensures the absolute reliability of safety functions through physical isolation of signal paths, and a logic screening mechanism prevents false yaw actions. The emergency yaw mode effectively mitigates mechanical stress concentration issues under extreme wind conditions while maintaining basic protection functions. The combined design of relay groups and logic circuits balances response speed and anti-interference capabilities, significantly improving system stability under complex operating conditions.
[0050] In one possible implementation, the electromagnetic brake control timing of the timing optimization module includes a pressure relief phase, a delayed release phase, and a start-up phase. The pressure relief phase lasts for 1.5 seconds, the delayed release phase lasts for 0.8 seconds, and the start-up phase is a soft start with the motor torque at 10% of the rated torque. The hardware adaptation module adds an expansion module for the EL2008 model and remaps the channel function for the EL2809 model.
[0051] The pressure relief phase refers to the initial stage of the electromagnetic braking system releasing hydraulic pressure to avoid mechanical shock. The delayed release phase refers to the buffer period before the brake is completely released, ensuring a smooth transition for the motor. The start-up phase refers to the initial operating state of the motor with low torque soft start, protecting the transmission system. The EL2008 expansion module refers to a hardware interface unit customized for a specific model, used for compatibility with newly added control functions. The EL2809 channel remapping refers to a scheme for redistributing controller signal channels to adapt to existing hardware.
[0052] As a specific example, when the EL2809 unit starts up: the depressurization phase lasts 1.5 seconds, during which the electromagnetic brake pressure drops from 100% to 30% to prevent gearbox shock. The delayed release phase lasts 0.8 seconds, during which the brake is completely released, and the motor speed synchronously increases to 5 rpm. The torque during the start-up phase is set to 10% of the rated value to avoid overloading the drivetrain. The EL2008 model connects to the new control circuit through an expansion module, while the EL2809 reuses the original interface by remapping channel #11.
[0053] This solution eliminates the mechanical shock during brake release through phased control, and the soft-start strategy significantly reduces wear on the transmission system. Hardware adaptability design allows for rapid modification to different models, improving system compatibility without replacing the core controller. The synergistic effect of timing optimization and hardware modification improves equipment operational stability while ensuring safety.
[0054] In one possible implementation, the system is forced into bypass mode when the safety chain is triggered. The yaw action must meet the following conditions: the wind direction change angular velocity exceeds 5° / s and the unit vibration value is lower than the protection threshold. The yaw command in bypass mode has a lower priority than in normal mode.
[0055] Among these, bypass mode refers to a special operating mode that the system switches to when the safety chain is triggered, allowing limited yaw function while ensuring safety. Wind direction change rate refers to the real-time measurement of the rate of wind direction change, which can assess the severity of wind conditions. Unit vibration protection threshold refers to a pre-set mechanical vibration safety limit, used to determine whether the equipment's operating status allows yaw adjustment. Yaw command priority refers to the processing order rules of control signals, ensuring safety constraints in emergency mode.
[0056] As a specific example, when the EL2809 unit encounters a gust of wind, the system detects that the safety chain has been triggered but the vibration value is below the threshold of 2.5 mm / s. At the same time, the wind direction change angular velocity reaches 6° / s. In this case, it enters bypass mode and allows the yaw system to perform wind adjustment with a lower priority. In this mode, the yaw rate is limited to 30% of the normal mode, and it automatically resumes full-function operation when the main safety chain is released.
[0057] This solution maximizes power generation efficiency while ensuring equipment safety by dynamically adjusting the yaw control strategy. The bypass state design adheres to safety protection principles while avoiding energy loss caused by completely locking the yaw system, achieving a balance between safety and economy. The multi-condition interlocking mechanism effectively prevents the risk of malfunction and improves the system's reliability under complex operating conditions.
[0058] In one possible implementation, the EL2008 model upgrade scheme for the hardware adaptation module includes adding components such as circuit breaker F42.2 and contactor K110.1 to reconstruct the electromagnetic brake power supply circuit; the EL2809 model upgrade scheme reuses the existing cable and only replaces the electromagnetic brake power supply cable.
[0059] Among them, circuit breaker F42.2 can refer to a protective switching element with a rated current of 42A, used to prevent overload of the electromagnetic brake power supply circuit. Contactor K110.1 can refer to an electromagnetic switching device with a 110V control voltage, used to realize remote on / off control of the power supply circuit. The electromagnetic brake power supply circuit can refer to a dedicated circuit that provides power to the braking system, used to ensure reliable operation of the braking mechanism. The EL2008 model retrofit solution can refer to an adaptation method that reconstructs the power supply path by adding new hardware, which can improve system compatibility. The EL2809 model retrofit solution can refer to local optimization measures based on existing lines, which can reduce retrofit costs.
[0060] Specifically, after adding circuit breaker F42.2 and contactor K110.1 to the EL2008 model, the electromagnetic brake power supply circuit voltage was upgraded from DC24V to DC110V, and the response time was shortened to 0.3 seconds. The EL2809 model only required replacing the power supply cable cross-section to 4mm². 2 The original control logic remains unchanged. Both solutions improve electromagnetic braking performance through hardware adaptation.
[0061] This retrofit plan significantly improves system reliability while ensuring equipment safety. The differentiated adaptation strategy for different turbine models meets performance requirements while controlling retrofit costs. The combination of hardware upgrades and line optimization provides a standardized solution for wind turbine retrofitting.
[0062] In one possible implementation, the method for generating yaw commands in emergency yaw mode includes: acquiring real-time wind direction angular velocity Δθ and unit vibration value V; generating fine-tuning yaw commands when Δθ > 5° / s and V < protection threshold; and maintaining the yaw system locked state if the conditions are not met.
[0063] Among them, the emergency yaw mode refers to a special operating state that the system enters when the safety chain is triggered, allowing limited yaw function while ensuring safety. Real-time wind direction angular velocity Δθ refers to the real-time measurement of the rate of wind direction change, which can assess the severity of wind conditions. Unit vibration protection threshold refers to a pre-set mechanical vibration safety limit, used to determine whether the equipment's operating status allows yaw adjustment. Fine-tuning yaw command refers to a small-amplitude yaw control signal, which can prevent damage to the unit due to severe wind loads. Yaw system lockout state refers to a protection mechanism that completely prohibits yaw actions, used to prevent equipment from going out of control under dangerous operating conditions.
[0064] As a specific example, when the EL2809 unit encounters gusts of wind, the system detects that the wind direction angular velocity Δθ reaches 6° / s and the vibration value V is below the threshold of 2.5 mm / s. At this time, a fine-tuning yaw command of 0.5° / s is generated. If Δθ is only 3° / s or the vibration value exceeds the threshold, the yaw system remains locked.
[0065] This solution achieves a balance between safety and functionality by dynamically assessing wind conditions and mechanical status. The intelligent yaw control strategy avoids equipment damage caused by sudden wind changes while maximizing power generation efficiency. A multi-condition interlocking mechanism effectively prevents the risk of malfunctions, improving system reliability under complex operating conditions.
[0066] In one possible implementation, the dynamic adjustment magnitude Δα of the yaw command is calculated using the following formula:
[0067] Δα=k1·Δθ+k2·(Vmax-V);
[0068] Where k1 is the wind direction angular velocity weighting coefficient, k2 is the vibration compensation coefficient, and Vmax is the maximum allowable vibration value; the value of Δα is limited to [-3°, 3°], and if it exceeds the range, it is treated as the amplitude limit value.
[0069] Among these parameters, the dynamic adjustment amplitude Δα of the yaw command refers to the yaw angle correction calculated in real time based on operating conditions, used to achieve precise wind control. The wind direction angular velocity weighting coefficient k1 is a parameter reflecting the sensitivity to wind condition changes, balancing the requirements of rapid response and stability. The vibration compensation coefficient k2 is an adjustment parameter characterizing the influence of mechanical conditions, used to suppress vibration interference with yaw. The maximum allowable vibration value Vmax refers to the upper limit of mechanical vibration for safe system operation, used to determine the compensation intensity. Limiting the amplitude refers to the technical means of boundary-constraining the calculation results, which can prevent excessive yaw.
[0070] Specifically, during implementation, k1 = 0.8° / s and k2 = 0.05mm / s are set. When the EL2809 unit measures Δθ = 4° / s and V = 1.2mm / s (Vmax = 2.5mm / s), Δα = 0.8 × 4 + 0.05 × (2.5 - 1.2) = 3.265° is calculated, and a 3° yaw command is output after amplitude limiting.
[0071] This scheme achieves a dynamic balance between wind condition response and mechanical protection through the synergistic effect of weighting and compensation coefficients. The intelligent yaw limiting mechanism ensures yaw accuracy while avoiding equipment risks under extreme conditions. Parametric design enhances the system's adaptability to different turbine models and improves the overall reliability of the wind power system.
[0072] In one possible implementation, the timing optimization module detects the hydraulic system pressure P at the end of the pressure relief phase. If P > threshold P0, the pressure relief time is extended until P ≤ P0. The value of P0 is dynamically adjusted according to the gearbox model and rated torque.
[0073] The timing optimization module is the core unit controlling the pressure relief sequence of the hydraulic system, used for precise management of the pressure release process. The pressure relief phase refers to the period during which the hydraulic system reduces internal pressure, protecting equipment from overpressure damage. The hydraulic system pressure P refers to the pressure exerted by the fluid medium on the container wall, reflecting the real-time status of the system. The threshold P0 refers to a pre-set safety pressure threshold to determine whether prolonged pressure relief is necessary. The gearbox model refers to the specific specifications of the transmission device, used to determine the system's load-bearing characteristics. The rated torque refers to the maximum allowable transmission torque, used to assess the safety boundaries of the operating conditions. Dynamic adjustment refers to real-time optimization of the control strategy based on operating parameters, improving system adaptability.
[0074] Specifically, during implementation, when the EL2809 unit reaches a pressure of 25 MPa (P0 = 20 MPa) at the end of the pressure relief phase, the timing optimization module extends the pressure relief time by 50% until P drops to 18 MPa. For different gearbox models (such as EL2008 or EL2809), P0 will be automatically adjusted to 22 MPa or 18 MPa based on the rated torque.
[0075] This solution achieves precise pressure relief control through dynamic pressure thresholds, avoiding system overload risks and improving energy recovery efficiency. Intelligent timing optimization significantly reduces hydraulic shock and extends the service life of critical components. Parametric design enables the system to adapt to the operating conditions of different gearbox models, enhancing the overall reliability of the wind power equipment.
[0076] In one possible implementation, the relationship between the pressure relief time T and the pressure P is calculated using the following formula:
[0077] T_relief = T_0 + k_3 * (P - P_0);
[0078] Where T0 is the baseline pressure relief time of 1.5 seconds, and k3 is the pressure correction coefficient; when P≤P0, the delayed release stage begins.
[0079] The reference pressure relief time T0 refers to the pressure relief time under standard system operating conditions, used to establish basic control logic. The pressure correction coefficient k3 is an adjustment parameter reflecting the sensitivity to pressure changes, enabling precise control of the pressure relief time. The delayed release phase refers to the buffer operation period after the pressure reaches the target, used to ensure a stable system transition. The pressure P refers to the current actual pressure value of the hydraulic system, used for real-time feedback control decisions. The threshold P0 refers to a pre-set safety pressure critical point, triggering the pressure relief sequence switching.
[0080] Specifically, during implementation, when the hydraulic system of the EL2809 unit has P = 26MPa (P0 = 20MPa) and k3 = 0.3 seconds / MPa, the calculated pressure relief time T = 1.5 + 0.3 × (26 - 20) = 3.3 seconds; if the pressure subsequently drops to 18MPa (≤ P0), it will automatically switch to the delayed release stage.
[0081] This solution achieves dynamic optimization of pressure relief time through a linear relationship, ensuring both pressure release efficiency and avoiding system shock risks. Intelligent timing control significantly improves the response accuracy of the hydraulic system and extends the life of critical seals. Parametric design enables the system to adapt to different pressure conditions, enhancing the operational reliability of wind power equipment.
[0082] In one possible implementation, the success rate S of the yaw maneuver in bypass mode is evaluated using the following formula:
[0083] S = Σ(Number of successful actions) / Σ(Total number of triggers) × 100%;
[0084] Among them, the number of successful actions refers to the number of times the yaw command is executed when Δθ>5° / s and V<protection threshold is met, and the total number of triggers is the total number of safety chain triggers; the statistical period of S is 30 consecutive days of operating data.
[0085] Among these, bypass mode refers to the system's operating condition in non-master control mode, enabling safety redundancy protection. Yaw action success rate (S) refers to the effectiveness of the system executing yaw commands in bypass mode, used to assess system reliability. Successful action count refers to the number of effective yawing actions that meet wind conditions and mechanical protection requirements, reflecting the system's response quality. Total trigger count refers to the total frequency of safety chain activation, used to statistically analyze the system's risk exposure frequency. Protection threshold refers to the maximum permissible safe value for mechanical vibration, used to control the amplitude of movement. Statistical period refers to the time window for performance evaluation, reflecting the system's long-term stability.
[0086] Specifically, during implementation, if the EL2809 unit triggers yaw commands a total of 120 times within 30 days in bypass mode (of which 98 times satisfy Δθ>5° / s and V<1.8mm / s), then the calculation is S=98 / 120×100%=81.67%.
[0087] This scheme achieves dynamic monitoring of yaw performance through a quantitative evaluation mechanism, ensuring equipment safety under extreme operating conditions while improving system availability. Long-term statistical methods effectively identify potential failure modes, providing data support for preventative maintenance. The multi-condition criterion design balances wind energy capture and mechanical protection requirements, significantly improving the overall efficiency of the wind power system.
[0088] This specification provides an embodiment of a yaw control system for wind turbine generators under safety chain triggering conditions, including: a safety chain signal decoupling module, used to split the main safety chain signal of the generator into a main safety chain signal and a yaw enable signal. The main safety chain signal maintains its original protection function, while the yaw enable signal is processed by a logic AND gate and then input to the yaw control unit; a yaw control command generation module, used to generate dynamic yaw commands based on wind direction sensor data and generator status data, and downgrade to emergency yaw mode when the safety chain is triggered; a timing optimization module, used to control the depressurization, delayed release, and start-up timing of the electromagnetic brake; and a hardware adaptation module, used to select a suitable hardware modification scheme according to the controller model. Through the timing optimization module of this solution, staged yaw control can still be executed when the safety chain is triggered, maintaining the protection function while achieving dynamic response, filling a technological gap in the industry.
[0089] It should be noted that for the aforementioned method embodiments, for the sake of simplicity of description, they are all expressed as a series of action combinations, but those skilled in the art should be aware that the embodiments of this specification are not limited by the order of the actions described, because according to the embodiments of this specification, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in this specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the embodiments of this specification.
[0090] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.
[0091] The preferred embodiments disclosed above are intended only to help illustrate this specification. The optional embodiments do not exhaustively describe all details, nor do they limit the invention to the specific embodiments described. Obviously, many modifications and variations can be made based on the content of the embodiments of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the embodiments of this specification, so that those skilled in the art can better understand and utilize this specification. This specification is limited only by the claims and their full scope and equivalents.
Claims
1. A yaw control system for a wind turbine generator set under a safety chain triggered state, characterized in that, include: The safety chain signal decoupling module is used to split the unit's main safety chain signal into a main safety chain signal and a yaw enable signal. The main safety chain signal maintains its original protection function, and the yaw enable signal is processed by a logic AND gate and then input to the yaw control unit. The yaw control command generation module is used to generate dynamic yaw commands based on wind direction sensor data and unit status data, and downgrade to emergency yaw mode when the safety chain is triggered. The timing optimization module is used to control the pressure relief, delayed release, and start-up timing of the electromagnetic brake; The hardware adaptation module is used to select the appropriate hardware modification scheme based on the controller model.
2. The yaw control system according to claim 1, characterized in that, The safety chain signal decoupling module achieves physical signal separation through a relay group, and the logic AND gate is designed to allow yaw action only when the main safety chain is not triggered and the external wind direction is abnormal. In emergency mode, the yaw control command generation module only performs yaw adjustments to avoid extreme loads.
3. The yaw control system according to claim 1, characterized in that, The electromagnetic brake control timing of the timing optimization module includes a pressure relief phase, a delayed release phase, and a start-up phase. The pressure relief phase lasts for 1.5 seconds, the delayed release phase lasts for 0.8 seconds, and the start-up phase is a soft start with the motor torque at 10% of the rated torque. The hardware adaptation module adds an expansion module for the EL2008 model and remaps the channel function for the EL2809 model.
4. The yaw control system according to claim 1, characterized in that, When the safety chain is triggered, the system is forced to enter the bypass state. The yaw action must meet the following conditions: the wind direction change angular velocity exceeds 5° / s and the unit vibration value is lower than the protection threshold. In the bypass mode, the yaw command has a lower priority than in the normal mode.
5. The yaw control system according to claim 3, characterized in that, The EL2008 model upgrade scheme for the hardware adaptation module includes the addition of circuit breaker F42.2 and contactor K110.1 components.
6. The yaw control system according to claim 1, characterized in that, The method for generating yaw commands in the emergency yaw mode includes: Obtain real-time wind direction angular velocity Δθ and unit vibration value V; When Δθ > 5° / s and V < protection threshold, a fine-tuning yaw command is generated; If the conditions are not met, the yaw system remains locked.
7. The yaw control system according to claim 6, characterized in that, The dynamic adjustment range Δα of the yaw command is calculated using the following formula: Δα=k1·Δθ+k2·(Vmax-V); Where k1 is the wind direction angular velocity weighting coefficient, k2 is the vibration compensation coefficient, and Vmax is the maximum allowable vibration value; The value of Δα is limited to [-3°, 3°], and values outside this range are treated as amplitude limits.
8. The yaw control system according to claim 1, characterized in that, The timing optimization module detects the hydraulic system pressure P at the end of the pressure relief phase. If P > threshold P0, the pressure relief time is extended until P ≤ P0. The value of P0 is dynamically adjusted according to the gearbox model and rated torque.
9. The yaw control system according to claim 8, characterized in that, The relationship between the pressure relief time T and the pressure P is calculated using the following formula: T_relief = T_0 + k_3 * (P - P_0); Where T0 is the baseline depressurization time of 1.5 seconds, and k3 is the pressure correction factor; When P≤P0, the delayed release phase begins.
10. The yaw control system according to claim 1, characterized in that, The success rate S of the yaw maneuver in bypass mode is evaluated by the following formula: S = Σ(Number of successful actions) / Σ(Total number of triggers) × 100%; Among them, the number of successful actions refers to the number of times the yaw command is executed if Δθ>5° / s and V<protection threshold is met, and the total number of triggers is the total number of safety chain triggers. The statistical period for S is 30 consecutive days of running data.