Protection control method, device and system for power generation system of wind turbine generator
By optimizing torque and adjusting PI parameters for pitch control using the TN curve envelope protection value, the problem of speed lag in wind turbines during rapid power changes was solved, thus improving the stability and safety of the wind turbine power generation system.
Patent Information
- Application Number
- CN202511170067.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-20
- Publication Date
- 2025-11-07
AI Technical Summary
When the power of a wind turbine changes rapidly, the speed change of the transmission system lags behind the torque change of the power generation system, resulting in low-speed, high-torque operation, which can easily cause overcurrent faults and affect the stability of the power generation system and equipment safety.
Torque optimization calculations are performed using the TN curve envelope protection value. Combined with the adjustment of pitch control PI parameters, the pitch control rate is optimized to ensure that the torque is controlled within a safe range and to avoid overcurrent faults.
It effectively prevents low-speed, high-torque operation, reduces the overcurrent failure rate of wind turbine power generation systems, and improves system operation stability and equipment safety.
Smart Images
Figure CN120906747A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application belongs to the technical field of wind power generation, and particularly relates to a wind turbine generator system protection control method, device and system. BACKGROUND
[0002] At present, wind turbine generators show a large-scale development trend, and their transmission systems have large inertia. In actual operation, when the power of the generator is rapidly and greatly controlled and adjusted, a significant problem occurs: the change in the rotational speed of the transmission system lags far behind the change in the torque of the power generation system. Specifically, in the power rapid adjustment stage, the torque of the power generation system changes rapidly, while the transmission system cannot timely follow the change in the torque of the power generation system to adjust the rotational speed due to the large inertia. In this case, a low-speed high-torque operation condition for a short time occurs. This low-speed high-torque operation condition is extremely unfavorable for the power generation system of the wind turbine generator, and is extremely prone to cause overcurrent failure of the power generation system. Once the overcurrent failure occurs, not only the normal operation of the wind turbine generator is affected, and the power generation efficiency is reduced, but also the equipment of the generator is damaged, the maintenance cost and downtime are increased, and thus the power supply stability and economic benefits of the entire wind farm are affected.
[0003] Therefore, how to effectively prevent the low-speed high-torque operation condition of the wind turbine generator in the power rapid change control process, and avoid the overcurrent failure of the power generation system, has become an important technical research topic to be solved in the current wind power field. SUMMARY
[0004] The present application aims to provide a wind turbine generator system protection control method, device and system, which can reduce the overcurrent failure rate of the wind turbine generator system, so as to improve the stability of the operation of the wind turbine generator system.
[0005] In a first aspect, the wind turbine generator system protection control method comprises the following steps:
[0006] When the generator is in a limited power operation state and the target power is a non-rated power, a current rotational speed target value is calculated according to the target power value by referring to the TN curve of the generator, and the generator is controlled to be in a limited power and limited rotational speed operation state;
[0007] When the torque exceeds the TN curve envelope line minus a protection value in the limited power and limited rotational speed operation state of the generator, the torque optimization calculation is performed based on the TN curve envelope line minus the protection value and the TN curve envelope line plus the protection value, and the calculated optimal target torque is sent to the converter for execution;
[0008] After the optimal target torque is sent to the converter for execution, when the rotational speed and torque reach the TN curve envelope line plus the protection value, the opening rate of the variable pitch control is increased by increasing the PI parameter value of the variable pitch control;
[0009] After increasing the pitch control opening rate, if the speed and torque are lower than the first protection value of the TN curve envelope, the pitch control rate is restored; if the speed and torque are not lower than the first protection value of the TN curve envelope, torque optimization calculation continues.
[0010] Optionally, the torque optimization calculation method is as follows:
[0011] Determine the PID output value of the torque controller, the first protection value of the TN curve envelope, and the second protection value of the curve envelope;
[0012] Connect T0 with The smaller value in the values is taken as the optimal target torque, where T1 is the first protection value of the TN curve envelope, and T2 is the second protection value of the curve envelope. When the unit is operating under power and speed limits and the torque exceeds the first protection value of the TN curve envelope, the system ensures that the unit operates with a more suitable torque while maintaining safety, thereby improving the stability and reliability of the power generation system. Using the relevant values of the TN curve envelope as the calculation basis ensures that the selection of the optimal target torque does not exceed the safe operating range of the unit. The first and second protection values of the TN curve envelope represent the boundary conditions for the safe operation of the unit. Through this calculation method, torque control is always performed within a safe framework, effectively avoiding damage to the unit due to excessive or insufficient torque, and ensuring the safe operation of the wind turbine power generation system.
[0013] Optionally, if T0 and If the smaller value in the range is less than 0, then the optimal target torque is 0;
[0014] If T0 and If the smaller value in the TN curve is greater than T2, then the optimal target torque is T2. In actual operation, a negative torque may indicate an abnormal operating state of the unit, such as reverse rotation. In this case, setting the torque to 0 can prevent the unit from operating under abnormal torque, preventing further damage to the unit equipment and protecting the unit's safety. The TN curve envelope protection value is the upper limit for safe operation of the unit. This limitation ensures that the torque will not exceed the safe upper limit under any circumstances, further guaranteeing the safety of the unit under complex operating conditions and avoiding equipment failure or safety accidents caused by excessive torque.
[0015] Optionally, the pitch control PI parameter value is calculated and adjusted according to the original default PI parameter value, the optimal target torque, the TN curve envelope line minus a protection value, a rated generator speed value of the unit, and a current generator speed value. The dynamic adjustment mode enables the pitch control to change in real time according to the current operating state of the unit, instead of using fixed PI parameters. By comprehensively considering multiple parameters related to the operation of the unit to adjust the pitch control PI parameter value, the performance of the pitch control can be optimized. When increasing the pitch control opening rate, appropriate PI parameter values can ensure that the opening process is smooth, fast and accurate, avoiding excessively fast or slow opening rates due to improper parameter settings, which affects the stable operation of the unit. At the same time, when restoring the pitch control rate, the parameters can also be reasonably adjusted according to the actual situation, so that the unit quickly returns to the normal pitch control state, improving the operating efficiency and stability of the entire wind turbine generator system.
[0016] Optionally, the calculation formula of the pitch control PI parameter value is:
[0017]
[0018] PI1 is the pitch control PI parameter value;
[0019] PI0 is the original default PI parameter value;
[0020] T is the optimal target torque;
[0021] T1 is the TN curve envelope line minus a protection value;
[0022] N r is the rated generator speed value of the unit;
[0023] N is the current generator speed value.
[0024] In a second aspect, the wind turbine generator system protection control device provided by the present application comprises:
[0025] The power-limited speed-limited operation control module is configured to, when the unit is in a power-limited operation state and the target power is a non-rated power, calculate a current speed target value according to the target power value by referring to the TN curve of the unit, and control the unit to be in a power-limited speed-limited operation state.
[0026] The torque optimization calculation and execution module is configured to, when the unit is in a power-limited speed-limited operation state, perform torque optimization calculation based on the TN curve envelope line minus a protection value and the TN curve envelope line plus a protection value when the torque exceeds the TN curve envelope line minus a protection value, and send the calculated optimal target torque to the converter for execution.
[0027] The pitch control opening rate adjusting module is used for increasing the pitch control opening rate by increasing the PI parameter value of the pitch control when the speed torque reaches the second protection value of the TN curve envelope after the optimal target torque is sent to the converter for execution.
[0028] The pitch control recovery and continuation calculating module is used for recovering the pitch control rate when the speed torque is lower than the first protection value of the TN curve envelope after the pitch control opening rate is increased, and continuing to execute the torque optimization calculation when the speed torque is not lower than the first protection value of the TN curve envelope.
[0029] In a third aspect, the wind turbine generator system protection control device is used in the wind turbine generator system.
[0030] The application has the following unexpected technical effects:
[0031] The application controls the output by torque optimization calculation, and increases the pitch control rate according to the relationship between the speed and the torque, so as to increase the speed rising slope, achieve the power rapid change, protect the wind turbine generator system from overcurrent failure, reduce the overcurrent failure rate of the wind turbine generator system, and improve the stability of the wind turbine generator system operation. BRIEF DESCRIPTION OF DRAWINGS
[0032] Figure 1 It is one of the flowcharts of the wind turbine generator system protection control method in the embodiments of the application;
[0033] Figure 2 It is the second flowchart of the wind turbine generator system protection control method in the embodiments of the application;
[0034] Figure 3 It is the schematic diagram of the TN curve, the first protection value of the TN curve envelope and the second protection value of the TN curve envelope in the embodiments of the application;
[0035] Figure 4 It is the principle block diagram of the wind turbine generator system protection control device in the embodiments of the application;
[0036] In the figure: 1, the power and speed limit operation control module, 2, the torque optimization calculation and execution module, 3, the pitch control opening rate adjusting module, 4, the pitch control recovery and continuation calculating module. DETAILED DESCRIPTION
[0037] Other advantages and benefits of the present application will become apparent to those skilled in the art upon consideration of the disclosure and the associated drawings. The present application can be embodied in various ways without departing from the spirit thereof. The preferred embodiments are therefore to be considered in all respects as being illustrative and not restrictive, and all changes coming within the meaning and equivalency range of the appended claims are therefore intended to be embraced therein.
[0038] As shown in Figure 1 The wind turbine generator system protection control method comprises the following steps:
[0039] When the unit is in a limited power operation state and the target power is not the rated power, the current speed target value is calculated according to the target power value and the TN curve of the unit, and the unit is controlled to be in a limited power and limited speed operation state.
[0040] When the torque exceeds the TN curve envelope line minus a protection value in the limited power and limited speed operation state of the unit, the torque optimization calculation is performed based on the TN curve envelope line minus a protection value and the TN curve envelope line plus a protection value, and the calculated optimal target torque is sent to the converter for execution.
[0041] After the optimal target torque is sent to the converter for execution, when the speed and torque reach the TN curve envelope line plus a protection value, the pitch control PI parameter value is increased to increase the pitch control pitch rate.
[0042] After the pitch control pitch rate is increased, when the speed and torque are lower than the TN curve envelope line minus a protection value, the pitch control rate is restored; and when the speed and torque are not lower than the TN curve envelope line minus a protection value, the torque optimization calculation is continued.
[0043] As shown in Figure 2 The wind turbine generator system protection control method is described in detail as follows.
[0044] The wind turbine generator system protection control method comprises the following steps:
[0045] Step 1: Start, the unit enters the grid-connected state, and then step 2 is entered.
[0046] Step 2: Determine whether the unit is in a limited power operation state and the target power is not the rated power; if yes, step 3 is entered; if not, the control is performed in a normal power generation operation state, that is, the torque change is limited by the TN curve, and the pitch is controlled by the default PI parameter.
[0047] Step 3: The controller calculates the current target speed value according to the target power value and the TN curve of the unit, controls the unit to be in the power-limited and speed-limited operation state, that is, the unit executes the power-lowering and speed-lowering control according to the target power and the TN curve, at this time the target power will quickly rise, and then step 4 is entered.
[0048] Step 4: It is judged whether the torque exceeds the TN curve envelope line minus a protection value, when the torque exceeds the TN curve envelope line minus the protection value, step 5 is entered, otherwise step 2 is returned.
[0049] As shown in Figure 3 , the TN curve represents the torque characteristics of the wind turbine at different speeds, reflecting the dynamic relationship of the unit at a specific wind speed or operating state.
[0050] The abscissa N represents the speed of the rotating part of the unit (such as the low-speed shaft, high-speed shaft or generator rotor).
[0051] The ordinate (T) represents the torque generated by the unit at the corresponding speed, usually in units of Newton-meters (N·m) or kilo-Newton-meters (kN·m).
[0052] As shown in Figure 3 , the TN curve is lower than the TN curve envelope line minus, and the TN curve envelope line minus is lower than the TN curve envelope line plus. The purpose of the TN curve envelope line minus is to detect whether the protection mechanism is triggered, and to calculate the final output torque. The purpose of the TN curve envelope line plus is to limit the limit value protection.
[0053] Step 5: The torque optimization calculation is performed in combination with the TN curve envelope line minus protection value and the TN curve envelope line plus protection value, and after the optimal target torque is calculated, the optimal target torque is input to the converter for execution, and step 6 is entered.
[0054] The torque optimization calculation method is:
[0055] The torque controller PID calculation output value T0, the TN curve envelope line minus protection value and the curve envelope line plus protection value are determined; the smaller value of T0 and T1 is taken as the optimal target torque, wherein T1 is the TN curve envelope line minus protection value, and T2 is the curve envelope line plus protection value.
[0056] In one possible embodiment, if the smaller value of T0 and T1 is less than 0, the optimal target torque is 0; if the smaller value of T0 and T1 is greater than T2, the optimal target torque is T2.
[0057] For example, the torque optimization calculation formula is as follows:
[0058]
[0059] T is the torque optimization value; Limit() means that the value of Min(T0, (T0+T1) / 2) must be between 0 and T2.
[0060] Step 6: Determine whether the speed and torque have reached the protection value of the TN curve envelope; if they have, proceed to step 7; if they have not, return to step 2.
[0061] Step 7: Increase the pitch control opening rate by increasing the pitch control PI parameter value, and then proceed to step 8;
[0062] The pitch control PI parameter value is calculated and adjusted based on the original default PI parameter value, the optimal target torque, the TN curve envelope protection value, the rated generator speed value, and the current generator speed value.
[0063] In one possible embodiment, the formula for calculating the pitch control PI parameter value is:
[0064]
[0065] PI1 is the pitch control PI parameter value; PI0 is the original default PI parameter value; T is the optimal target torque; T1 is the TN curve envelope protection value; N r N is the rated generator speed of the unit; N is the current generator speed.
[0066] For example, PI1 includes a scaling gain K. p1 and integral gain K i1 PI0 includes the proportional gain K p0 and integral gain K i0 ,Right now:
[0067]
[0068] In this embodiment of the application, "opening the blades" means that the blades change from a large angle to a small angle to improve wind energy absorption and thus increase the wind turbine speed, while "closing the blades" is the opposite.
[0069] Step 8: Determine whether the speed and torque are lower than the protection value of the TN curve envelope. If the speed and torque are lower than the protection value of the TN curve envelope, proceed to step 9; otherwise, return to step 5.
[0070] Step 9: Restore the pitch control PI parameter value, end the process and restart the loop.
[0071] like Figure 4As shown, in the embodiment of the application, a wind turbine generator system protection control device includes a power limit and speed limit operation control module 1, a torque optimization calculation and execution module 2, a variable pitch control opening pitch rate adjustment module 3, and a variable pitch control recovery and continuous calculation module 4. The power limit and speed limit operation control module 1, the torque optimization calculation and execution module 2, the variable pitch control opening pitch rate adjustment module 3, and the variable pitch control recovery and continuous calculation module 4 are communicatively connected. The power limit and speed limit operation control module 1 is configured to calculate a current speed target value according to a target power value by referring to a TN curve of the wind turbine generator system when the wind turbine generator system is in a power limit operation state and the target power is a non-rated power, and control the wind turbine generator system to be in the power limit and speed limit operation state. The torque optimization calculation and execution module 2 is configured to perform torque optimization calculation based on a first protection value of an envelope line of the TN curve and a second protection value of the envelope line of the TN curve when the torque exceeds the first protection value of the envelope line of the TN curve when the wind turbine generator system is in the power limit and speed limit operation state, and send an optimal target torque calculated to a converter for execution. The variable pitch control opening pitch rate adjustment module 3 is configured to increase a PI parameter value of the variable pitch control to increase an opening pitch rate of the variable pitch control when the speed and torque reach the second protection value of the envelope line of the TN curve after the optimal target torque is sent to the converter for execution. The variable pitch control recovery and continuous calculation module 4 is configured to recover the variable pitch control rate when the speed and torque are lower than the first protection value of the envelope line of the TN curve after the opening pitch rate of the variable pitch control is increased, and continue to perform the torque optimization calculation when the speed and torque are not lower than the first protection value of the envelope line of the TN curve.
[0072] In the embodiment of the application, a wind turbine generator system adopts the wind turbine generator system protection control device as in the embodiment of the application.
[0073] The above embodiments are preferred embodiments of the application, but the embodiments of the application are not limited by the above embodiments, and any changes, modifications, substitutions, combinations, simplifications made without departing from the spirit and principles of the application shall be equivalent replacement methods, and all shall be included in the protection scope of the application.
Claims
1. A wind turbine generator system protection control method, characterized by, The method comprises the following steps: When the unit is in a limited power operation state and the target power is a non-rated power, a current speed target value is calculated according to a target power value and a TN curve of the unit, and the unit is controlled to be in a limited power and limited speed operation state; When the torque exceeds a first protection value of the TN curve envelope line, torque optimization calculation is performed based on the first protection value and a second protection value of the TN curve envelope line, and the calculated optimal target torque is sent to the converter for execution; After the optimal target torque is sent to the converter for execution, when the speed torque reaches the second protection value of the TN curve envelope line, the opening rate of the pitch control is increased by increasing the PI parameter value of the pitch control; After the opening rate of the pitch control is increased, when the speed torque is lower than the first protection value of the TN curve envelope line, the pitch control rate is restored; and when the speed torque is not lower than the first protection value of the TN curve envelope line, torque optimization calculation is continuously performed.
2. The wind turbine generator system protection control method of claim 1, wherein, The torque optimization calculation method is: The PID calculation output value T0 of the torque controller, the first protection value of the TN curve envelope line, and the second protection value of the curve envelope line are determined; The smaller value between T0 and is taken as the optimal target torque, where T1 is the TN curve envelope minus a protection value, and T2 is the curve envelope two minus a protection value.
3. The wind turbine generator system protection control method according to claim 2, characterized in that, If the smaller value of T0 and is less than 0, the optimal target torque is 0. If the smaller of T0 and T2 is greater than T2, the optimal target torque is T2.
4. The wind turbine generator system protection control method of claim 1, wherein, The PI parameter value of the pitch control is calculated and adjusted according to the original default PI parameter value, the optimal target torque, the first protection value of the TN curve envelope line, the rated generator speed value of the unit, and the current generator speed value.
5. The wind turbine generator system protection control method of claim 4, wherein, The calculation formula of the PI parameter value of the pitch control is: PI1 is the PI parameter value of the pitch control; PI0 is the original default PI parameter value; T is the optimal target torque; T1 is the first protection value of the TN curve envelope line; N r N is the rated generator speed value for the machine set; N is the current generator speed value.
6. A wind turbine generator system protection control device characterized by, It comprises: A limited power and limited speed operation control module (1) for calculating a current speed target value according to a target power value and a TN curve of the unit when the unit is in a limited power operation state and the target power is a non-rated power, and controlling the unit to be in a limited power and limited speed operation state; A torque optimization calculation and execution module (2) for performing torque optimization calculation based on a first protection value and a second protection value of a TN curve envelope line when the torque exceeds the first protection value of the TN curve envelope line when the unit is in a limited power and limited speed operation state, and sending the calculated optimal target torque to the converter for execution; A pitch control opening rate adjustment module (3) for increasing the opening rate of the pitch control by increasing the PI parameter value of the pitch control when the speed torque reaches the second protection value of the TN curve envelope line after the optimal target torque is sent to the converter for execution; A pitch control restoration and continuous calculation module (4) for restoring the pitch control rate when the speed torque is lower than the first protection value of the TN curve envelope line after the opening rate of the pitch control is increased, and continuously performing torque optimization calculation when the speed torque is not lower than the first protection value of the TN curve envelope line.
7. The wind turbine generator system protection control device of claim 6, wherein, The torque optimization calculation method is: The PID calculation output value T0 of the torque controller, the first protection value of the TN curve envelope line, and the second protection value of the curve envelope line are determined; The smaller value between T0 and is taken as the optimal target torque, where T1 is the TN curve envelope minus a protection value, and T2 is the curve envelope two minus a protection value.
8. The wind turbine generator system protection control device of claim 7, wherein, If the smaller value of T0 and is less than 0, the optimal target torque is 0. If the smaller of T0 and T2 is greater than T2, the optimal target torque is T2.
9. The wind turbine generator system protection control apparatus according to claim 6, wherein, The pitch control PI parameter value is calculated and adjusted according to original default PI parameter value, optimal target torque, TN curve envelope protection value, unit rated generator speed value and current generator speed value.
10. A wind turbine generator system, characterized by, The wind turbine generator system protection control device as claimed in any one of claims 6 to 7 is adopted.