An Adaptive Operation Control Method for Tidal Power Generation Load Conditions

Abstract

This invention provides an adaptive operation control method for tidal current power generation load conditions, comprising: when the tidal current velocity increases and the fixed-pitch propeller generator meets the adjustment conditions, adjusting the current control mode according to the following strategy: specifically, when the current control mode is torque mode, the next control mode is rated speed mode; when the current control mode is rated speed mode, the next control mode is low rated speed mode; when the current control mode is low rated speed mode, the next control mode is shutdown mode; when the tidal current velocity decreases and the fixed-pitch propeller generator meets the adjustment conditions, adjusting the current control mode according to the following strategy: specifically, when the current control mode is torque mode, the next control mode is shutdown mode; when the current control mode is rated speed mode, the next control mode is torque mode; when the current control mode is low rated speed mode, the next control mode is rated speed mode. This invention improves the operational safety of the generator set.

Description

Technical Field

[0001] This invention relates to the field of ocean energy power generation technology, and specifically to an adaptive operation control method for tidal energy power generation load conditions. Background Technology

[0002] Tidal energy is a type of ocean energy that utilizes the energy of water flow generated by the rise and fall of tides to generate electricity. It is a green and clean energy source. During high and low tides, the velocity of a tidal segment generally gradually increases to a maximum value, then decreases to a minimum value, and then the tide reverses direction, repeating the process of increasing and decreasing velocity again. The direction of the tidal current is opposite to that of the high and low tides, but theoretically, the direction of the tidal current is the same within the same tidal segment.

[0003] Because my country's tidal energy-rich sea areas are located near the coast with complex underwater topography, the actual tidal flow conditions faced by tidal power generators in open sea areas differ significantly from the theoretical conditions due to mutual interference between waterways. At certain critical points, the flow velocity fluctuates repeatedly, sometimes large and sometimes small. Within a short period of time, the tidal flow velocity may suddenly increase or decrease due to flow disturbances and turbulence, or it may suddenly increase and then suddenly decrease, or suddenly decrease and then suddenly increase again. For fixed-pitch propeller generators, the pitch is fixed and the unloading capacity is relatively weak. When the control mode is only a single mode, if the control strategy cannot keep up with the matching and processing in time, abnormal situations such as overpower, overspeed, excessive vibration, and passive grid disconnection may occur, leading to unit shutdown or failure, which greatly increases the unit's downtime and maintenance costs.

[0004] Therefore, there is an urgent need to provide an adaptive operation control method for tidal power generation load conditions. By adding control modes and setting switching strategies between control modes, this method solves the safety problems caused by repeated changes in tidal energy or sudden load changes when fixed-pitch propeller turbines are running, such as overspeed and overload, or shutdown problems caused by the need for emergency shutdown. This method avoids unit failures and reduces unit downtime and maintenance costs. Summary of the Invention

[0005] In view of this, it is necessary to provide an adaptive operation control method for tidal power generation load conditions to solve the technical problem that the existing fixed-pitch propeller generator sets have a single control mode, which makes them prone to abnormal conditions such as overpower, overspeed, and excessive vibration during operation, leading to unit failure and increasing the unit's failure time and maintenance costs.

[0006] This invention provides an adaptive operation control method for tidal current power generation load conditions, used to control the control mode of a fixed-pitch propeller generator unit when encountering tidal current during operation. The control modes include a torque mode, a rated speed mode, a low rated speed mode, and a shutdown mode, with the speed in the torque mode, rated speed mode, and low rated speed mode decreasing sequentially. The method includes:

[0007] When the tidal flow velocity increases, resulting in an increase in load, the power and / or speed of the fixed-pitch propeller generator set are obtained. When the power and / or speed exceed a first set value and the duration of the exceedance is greater than a first duration, the current control mode is adjusted to the next control mode using a first preset adjustment strategy. The first preset adjustment strategy is as follows: when the current control mode is torque mode, the next control mode is rated speed mode; when the current control mode is rated speed mode, the next control mode is low rated speed mode; when the current control mode is low rated speed mode, the next control mode is shutdown mode.

[0008] When the tidal flow velocity decreases, resulting in a decrease in load, the power and / or speed of the fixed-pitch propeller generator set are obtained. When the power and / or speed is less than a second set value and less than a duration greater than a second duration, the current control mode is adjusted to the next control mode using a second preset adjustment strategy. The second preset adjustment strategy is as follows: when the current control mode is torque mode, the next control mode is shutdown mode; when the current control mode is rated speed mode, the next control mode is torque mode; when the current control mode is low rated speed mode, the next control mode is rated speed mode.

[0009] In some possible implementations, the first duration includes a first increase duration, a second increase duration, and a third increase duration. When the tidal flow velocity increases, leading to an increase in load, the power and / or speed of the fixed-pitch propeller generator set are acquired. When the power and / or speed exceeds a first set value, and the duration of the excess exceeds the first duration, the current control mode is adjusted to the next control mode using a first preset adjustment strategy, including:

[0010] When the current control mode is torque mode, and the power of the fixed-pitch propeller generator set is greater than the first power setting value and / or the speed is greater than the first speed setting value, and the duration of the power being greater than the first power setting value and / or the duration of the speed being greater than the first speed setting value is greater than the first increase duration, the current control mode is adjusted to rated speed mode.

[0011] When the current control mode is the rated speed mode, and the power of the fixed-pitch propeller generator set is greater than the first power setting value and greater than the second power setting value, and the duration of the power being greater than the second power setting value is greater than the second increase duration, the current control mode is adjusted to the low rated speed mode.

[0012] When the current control mode is the low rated speed mode, and the power of the fixed-pitch propeller generator is greater than the first power setting value and greater than the third power setting value, and the duration of the power being greater than the third power setting value is greater than the third increase duration, the current control mode is adjusted to the shutdown mode.

[0013] In some possible implementations, the method further includes:

[0014] When the tidal flow velocity increases, resulting in an increase in load, it is determined whether the power of the fixed-pitch propeller generator exceeds the upper limit of the limit power and whether the duration of exceeding the upper limit of the limit power is greater than the first limit duration. If so, the current control mode is adjusted to the low rated speed mode. The current control mode is either torque mode or rated speed mode.

[0015] In some possible implementations, the first power setting and the second power setting are 1.02-1.08 times the rated power, the first speed setting is 1.02-1.08 times the rated speed, the third power setting is 1.09-1.11 times the rated power, and the upper limit of the maximum power is 1.1-1.2 times the rated power.

[0016] The first and second increase durations are 3S-7S, the third increase duration is 9S-11S, and the first limit duration is 1.5S-2.5S.

[0017] In some possible implementations, the second duration includes a first reduction duration, a second reduction duration, and a third reduction duration. When the tidal flow velocity decreases, resulting in a decrease in load, the power and / or speed of the fixed-pitch propeller generator set are obtained. When the power and / or speed is less than a second set value and less than the duration but greater than the second duration, the current control mode is adjusted to the next control mode using a second preset adjustment strategy, including:

[0018] When the current control mode is torque mode, and the power of the fixed-pitch propeller generator is less than the fourth power setting value, and the duration of the power being less than the fourth power setting value is greater than the first reduction duration, the current control mode is adjusted to shutdown mode.

[0019] When the current control mode is rated speed mode, and the power of the fixed-pitch propeller generator is less than the fifth power setting value, and the duration of the power being less than the fifth power setting value is greater than the second reduction duration, the current control mode is adjusted to torque mode.

[0020] When the current control mode is the low rated speed mode, and the power of the fixed-pitch propeller generator is less than the sixth power setting value, and the duration of the power being less than the sixth power setting value is greater than the third reduction duration, the current control mode is adjusted to the rated speed mode.

[0021] In some possible implementations, the method further includes:

[0022] When the tidal flow velocity decreases, resulting in a decrease in load, it is determined whether the power of the fixed-pitch propeller generator is less than the lower limit of the limit power and whether the duration of the period ...

[0023] In some possible implementations, the fourth and fifth power settings are 0.75-0.85 times the rated power, the sixth power setting is 0.9-0.95 times the rated power, and the lower limit of the ultimate power is 0.65-0.7 times the rated power.

[0024] The first reduction duration, the second reduction duration, and the third reduction duration are 3S-7S, and the second limit duration is 2.5S-3.5S.

[0025] In some possible implementations, the allocation strategy for the control mode is as follows before executing the first preset adjustment strategy or the second preset adjustment strategy:

[0026] When the power of the fixed-pitch propeller generator set is less than the rated power, the control mode is determined to be torque mode;

[0027] When the power of the fixed-pitch propeller generator set is greater than the power setting value, the control mode is determined to be the low rated speed mode, and the power setting value is a preset multiple of the rated power.

[0028] When the power of the fixed-pitch propeller generator set is greater than or equal to the rated power and less than or equal to the power setting value, the control mode is determined to be the rated speed mode.

[0029] In some possible implementations, the control mode further includes an ultra-low rated speed mode, where the speed is lower than that of the low rated speed mode. In this case, the first preset adjustment strategy is:

[0030] When the current control mode is torque mode, the next control mode is rated speed mode. When the current control mode is rated speed mode, the next control mode is low rated speed mode. When the current control mode is low rated speed mode, the next control mode is ultra-low rated speed mode. When the current control mode is ultra-low rated speed mode, the next control mode is shutdown mode.

[0031] In some possible implementations, the second preset adjustment strategy is:

[0032] When the current control mode is torque mode, the next control mode is shutdown mode. When the current control mode is rated speed mode, the next control mode is torque mode. When the current control mode is low rated speed mode, the next control mode is rated speed mode. When the current control mode is ultra-low rated speed mode, the next control mode is low rated speed mode.

[0033] The beneficial effects of adopting the above implementation method are as follows: The adaptive operation control method for tidal power generation load conditions provided by the present invention introduces three control modes under non-stop conditions: torque mode, rated speed mode, and low rated speed mode. It can switch between multiple control modes based on power and / or speed, so that the switched control mode matches the actual scenario of sudden increase or decrease in tidal power. That is, it enables the control strategy to keep up with the actual scenario in a timely manner, avoids generator set failures caused by over-power, over-speed, etc., significantly reduces the unit's failure time and maintenance costs, and improves the operational safety of fixed-pitch propeller generator sets. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 A schematic flowchart of an embodiment of the adaptive operation control method for tidal power generation load conditions provided by the present invention;

[0036] Figure 2 This is a schematic flowchart of another embodiment of the adaptive operation control method for tidal power generation load conditions provided by the present invention. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0038] It should be understood that the illustrative drawings are not drawn to scale. The flowcharts used in this invention illustrate operations implemented according to some embodiments of the invention. It should be understood that the operations in the flowcharts may be implemented out of order, and steps without logical contextual relationships may be reversed or performed simultaneously. Furthermore, those skilled in the art, guided by the content of this invention, may add one or more other operations to the flowcharts, or remove one or more operations from the flowcharts. Some block diagrams shown in the drawings are functional entities and do not necessarily correspond to physically or logically independent entities. These functional entities may be implemented in software, in one or more hardware modules or integrated circuits, or in different network and / or processor systems and / or microcontroller systems.

[0039] The terms "first," "second," etc., used in the embodiments of this invention are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a technical feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.

[0040] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0041] This invention provides an adaptive operation control method for tidal power generation load conditions, used to control the control mode of a fixed-pitch propeller generator when it encounters tidal power. The control modes include torque mode, rated speed mode, low rated speed mode and shutdown mode. Specifically, the speed in torque mode, rated speed mode and low rated speed mode decreases in sequence.

[0042] It should be noted that torque mode refers to controlling the generator set's speed and power based on a pre-set power-speed curve. Rated speed mode refers to controlling the generator set to operate at a fixed rated speed. Low rated speed mode refers to controlling the generator set to operate at a speed lower than the rated speed.

[0043] In some embodiments of the present invention, the adaptive operation control method for tidal power generation load conditions includes:

[0044] When the tidal flow velocity increases, resulting in an increase in load, the power and / or speed of the fixed-pitch propeller generator set are obtained. When the power and / or speed exceed a first set value and the duration of the exceedance is greater than a first duration, the current control mode is adjusted to the next control mode using a first preset adjustment strategy. The first preset adjustment strategy is as follows: when the current control mode is torque mode, the next control mode is rated speed mode; when the current control mode is rated speed mode, the next control mode is low rated speed mode; when the current control mode is low rated speed mode, the next control mode is shutdown mode.

[0045] When the tidal flow velocity decreases, resulting in a decrease in load, the power and / or speed of the fixed-pitch propeller generator set are obtained. When the power and / or speed is less than the second set value and the duration is greater than the second duration, the current control mode is adjusted to the next control mode according to the second preset adjustment strategy. The second preset adjustment strategy is as follows: when the current control mode is torque mode, the next control mode is shutdown mode; when the current control mode is rated speed mode, the next control mode is torque mode; when the current control mode is low rated speed mode, the next control mode is rated speed mode.

[0046] Specifically, the first setting value is greater than the second setting value.

[0047] The entire control process described above is controlled by a PLC program. The duration and setpoints can be set or adjusted according to the actual application scenario, and can be modified and optimized based on the operating conditions.

[0048] It should be noted that when the tidal flow velocity increases, the power and rotational speed can be at their maximum values, while when the tidal flow velocity decreases, the power and rotational speed can be at their minimum values.

[0049] It should also be noted that, in order to improve the safety of the generator set during the adjustment process, when the speed or power exceeds the first set value and the duration exceeds the first duration, the generator will first stop by applying a reverse torque through the frequency converter, and then the mechanical brake will be applied. If the frequency converter fails, the generator will stop directly by applying the mechanical brake to avoid dangerous situations.

[0050] It should be understood that the adaptive operation control method for tidal power generation load conditions in the embodiments of the present invention can be implemented in any device based on the adaptive operation control method for tidal power generation load conditions, such as the control equipment of a generator set. Specifically, the adaptive operation control method for tidal power generation load conditions is stored in the aforementioned device as a pre-programmed program. When the device is started, the program is invoked, and the adaptive operation control method for tidal power generation load conditions is implemented.

[0051] Compared with the prior art, the adaptive operation control method for tidal power generation load conditions provided in this embodiment of the invention introduces three control modes under non-shutdown conditions: torque mode, rated speed mode, and low rated speed mode. It can switch between multiple control modes based on power and / or speed, so that the switched control mode matches the actual scenario of sudden increase or decrease in tidal power. That is, it enables the control strategy to keep up with the actual scenario in a timely manner, avoids generator set failures caused by over-power, over-speed, etc., significantly reduces the unit's failure time and maintenance costs, and improves the operational safety of fixed-pitch propeller generator sets.

[0052] In some embodiments of the present invention, the first duration includes a first increase duration, a second increase duration, and a third increase duration, such as... Figure 1 As shown, the first preset adjustment strategy when the power flow velocity increases, leading to an increase in load, is as follows:

[0053] When the current control mode is torque mode, and the power of the fixed-pitch propeller generator is greater than the first power setting value and / or the speed is greater than the first speed setting value, and the duration of the power being greater than the first power setting value and / or the duration of the speed being greater than the first speed setting value is greater than the first increase duration, the current control mode will be adjusted to rated speed mode.

[0054] Here, power and / or speed refers to power, speed, and power and speed. In other words, when at least one of the power or speed exceeds the first power setting value and the first speed setting value, the condition for adjusting the current control mode from speed mode to rated speed mode is met.

[0055] When the current control mode is rated speed mode, and the power of the fixed-pitch propeller generator is greater than the first power setting value and greater than the second power setting value, and the duration of the power being greater than the second power setting value is greater than the second increase duration, the current control mode will be adjusted to low rated speed mode.

[0056] When the current control mode is low rated speed mode, and the power of the fixed-pitch propeller generator is greater than the first power setting value and the third power setting value, and the duration of the power being greater than the third power setting value is greater than the third increase duration, the current control mode will be adjusted to shutdown mode.

[0057] This invention, through its embodiment, adjusts the current control mode to the next control mode with a lower speed as the power and / or speed increases, thereby avoiding overload and ensuring that the generator set does not exceed the speed limit or overload.

[0058] In some embodiments of the present invention, the first power setting value and the second power setting value are 1.02-1.08 times the rated power, the first speed setting value is 1.02-1.08 times the rated speed, and the third power setting value is 1.09-1.11 times the rated power; the first increase duration and the second increase duration are 3S-7S, and the third increase duration is 9S-11S.

[0059] In a specific embodiment of the present invention, the first power setting value and the second power setting value are 1.05 times the rated power, the first speed setting value is 1.05 times the rated speed, the third power setting value is 1.01 times the rated power, the first increase duration and the second increase duration are 5 seconds, and the third increase duration is 10 seconds.

[0060] By setting specific adjustment conditions for mode adjustment / switching, this invention can optimize the timing of adjustment, avoid the adverse effects of drastic changes in unit speed and power caused by switching too quickly, and avoid the problem that unit speed and power will immediately become overloaded and trigger an emergency shutdown when switching is not timely enough, thus achieving accurate switching of control modes.

[0061] In some embodiments of the present invention, the second duration includes a first reduced duration, a second reduced duration, and a third reduced duration, such as... Figure 1 As shown, when the power flow velocity decreases, resulting in a decrease in load, the second preset adjustment strategy is:

[0062] When the current control mode is torque mode, and the power of the fixed-pitch propeller generator is less than the fourth power setting value, and the duration of the power being less than the fourth power setting value is greater than the first reduction duration, the current control mode will be adjusted to shutdown mode.

[0063] When the current control mode is rated speed mode, and the power of the fixed-pitch propeller generator is less than the fifth power setting value, and the duration of the power being less than the fifth power setting value is greater than the second reduction duration, the current control mode will be adjusted to torque mode.

[0064] When the current control mode is the low rated speed mode, and the power of the fixed-pitch propeller generator is less than the sixth power setting value, and the duration of the power being less than the sixth power setting value is greater than the third reduction duration, the current control mode will be adjusted to the rated speed mode.

[0065] This invention, by setting the current control mode to the next control mode with a higher speed as the power decreases, can avoid the generator set from running continuously without interruption, thereby avoiding the maintenance time of the generator set.

[0066] In some embodiments of the present invention, the fourth power setting value and the fifth power setting value are 0.75-0.85 times the rated power, and the sixth power setting value is 0.9-0.95 times the rated power; the first reduction duration, the second reduction duration and the third reduction duration are 3S-7S.

[0067] Specifically, the fourth and fifth power settings are 0.8 times the rated power, and the sixth power setting is 0.95 times the rated power; the first reduction duration, the second reduction duration, and the third reduction duration are 5 seconds.

[0068] In actual fixed-pitch propeller generator operating environments, there are situations where the tidal current velocity suddenly increases or decreases drastically. If the control mode is adjusted using the first and second preset adjustment strategies under these circumstances, the adjustment may be insufficient, and overload or shutdown risks may still occur. To address these two special situations, in some embodiments of the present invention, such as... Figure 1 As shown, the adaptive operation control method for tidal power generation load conditions also includes:

[0069] When the tidal flow velocity increases, resulting in an increase in load, it is determined whether the power of the fixed-pitch propeller generator exceeds the upper limit of the limit power and whether the duration of exceeding the upper limit power is greater than the first limit duration. If so, the current control mode is adjusted to the low rated speed mode. The current control mode is torque mode or rated speed mode.

[0070] When the tidal flow velocity decreases, resulting in a decrease in load, it is determined whether the power of the fixed-pitch propeller generator is less than the lower limit of the limit power and whether the duration of the period ...

[0071] This invention introduces upper and lower limits for maximum power to determine whether a scenario involves a sudden and drastic increase or decrease in load. When the load suddenly increases, the current control mode is directly adjusted to a low rated speed mode. Specifically, the torque mode can be directly adjusted to a low rated speed mode without first switching to the rated speed mode, thus improving the response speed of speed and load adjustments. Similarly, when the load suddenly decreases, the current control mode is directly adjusted to a torque mode. Again, the low rated speed mode can be directly adjusted to a torque mode without first switching to the rated speed mode, further improving the response speed of speed and load, enhancing the responsiveness of the control mode, and ultimately ensuring the operational safety of the generator set.

[0072] In a specific embodiment of the present invention, the upper limit of the limit power is 1.1-1.2 times the rated power, the first limit duration is 1.5S-2.5S, the lower limit of the limit power is 0.65-0.7 times the rated power, and the second limit duration is 2.5S-3.5S.

[0073] Specifically, the upper limit of the limiting power is 1.1 times the rated power, the first limit duration is 2 seconds, the lower limit of the limiting power is 0.7 times the rated power, and the second limit duration is 3 seconds.

[0074] It should be understood that when the power flow velocity and load suddenly increase, decrease, decrease and then suddenly increase or decrease, the process can be switched according to the current mode and power / speed judgment conditions, and the switching follows the first preset adjustment strategy and the second preset adjustment strategy.

[0075] It should be noted that, to further ensure the safety of the generator set, in some embodiments of the present invention, such as... Figure 1 As shown, regardless of the current control mode, when the power, speed, or vibration value of the generator set exceeds the safety limit, it will be directly adjusted to the shutdown mode.

[0076] Since the above processes are all based on adjustments to the current control mode, before executing the first preset adjustment strategy or the second preset adjustment strategy, such as Figure 1 As shown, the control mode allocation strategy is as follows:

[0077] When the power of the fixed-pitch propeller generator set is less than the rated power, the control mode is determined to be torque mode;

[0078] When the power of the fixed-pitch propeller generator set is greater than the power setting value, the control mode is set to low rated speed mode, and the power setting value is a preset multiple of the rated power.

[0079] When the power of the fixed-pitch propeller generator set is greater than or equal to the rated power and less than or equal to the power setting value, the control mode is determined to be the rated speed mode.

[0080] The preset multiplier can be set or adjusted according to the actual application scenario, and no specific limit is made here.

[0081] To further improve the precision of adjustment of the fixed-pitch propeller generator set, in some embodiments of the present invention, such as... Figure 2 As shown, the control mode also includes an ultra-low rated speed mode. The speed in the ultra-low rated speed mode is lower than the speed in the low rated speed mode. Therefore, the first preset adjustment strategy is:

[0082] When the current control mode is torque mode, the next control mode is rated speed mode; when the current control mode is rated speed mode, the next control mode is low rated speed mode; when the current control mode is low rated speed mode, the next control mode is ultra-low rated speed mode; when the current control mode is ultra-low rated speed mode, the next control mode is shutdown mode.

[0083] The second preset adjustment strategy is:

[0084] When the current control mode is torque mode, the next control mode is shutdown mode. When the current control mode is rated speed mode, the next control mode is torque mode. When the current control mode is low rated speed mode, the next control mode is rated speed mode. When the current control mode is ultra-low rated speed mode, the next control mode is low rated speed mode.

[0085] In other words, by introducing an ultra-low rated speed mode in addition to the low rated speed mode, the operating speed is even lower than the low rated speed mode, which can better reduce power consumption. This better addresses the issue of overload requiring shutdown even when using the low rated speed mode under increased load. Similarly, when the load decreases, the number of mode adjustment levels is increased, improving the precision of the adjustment.

[0086] Specifically, the adjustment process for ultra-low rated speed is as follows: When the power of the fixed-pitch propeller generator exceeds the set power (e.g., 1.1 times the rated power) for a period of time (e.g., 3 seconds), the operating low rated speed mode can be switched to an even lower rated speed mode, thereby lowering the unit's operating speed, reducing the unit's power output, reducing overload, and further reducing the probability of shutdown. Once the power falls below the set power (e.g., 1.05 times the rated power) for a period of time (e.g., 60 seconds), the even lower rated speed mode is switched back to the low rated speed mode.

[0087] In summary, the adaptive operation control method for tidal power generation load conditions proposed in this invention first divides the control mode of the unit's operation into three types based on the unit's main power range: torque mode, rated speed mode, and low rated speed mode, to match the unit's main operating conditions. Then, by introducing a pre-set combination of adjustable key parameters and duration criteria, the method flexibly adjusts the switching between the three control modes according to the actual situation when certain conditions are met, ensuring uninterrupted normal operation of the unit while maximizing its operational safety. Furthermore, it considers the problem of sudden load changes, further ensuring the safety of the generator unit's operation.

[0088] Those skilled in the art will understand that all or part of the processes of the methods described in the above embodiments can be implemented by a computer program instructing related hardware (such as a processor, controller, etc.), and the computer program can be stored in a computer-readable storage medium. The computer-readable storage medium may be a disk, optical disk, read-only memory, or random access memory, etc.

[0089] The adaptive operation control method for tidal power generation load conditions provided by the present invention has been described in detail above. Specific examples have been used to illustrate the principle and implementation of the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A tidal current energy power generation load condition adaptive operation control method, characterized in that, A control method for controlling a control mode of a fixed pitch propeller generator set when encountering tidal current energy, the control mode including a torque mode, a rated speed mode, a low rated speed mode, and a shutdown mode, the speed of the torque mode, the speed of the rated speed mode, and the speed of the low rated speed mode decreasing in turn; the method comprising: When the tidal current flow rate increases, causing the load to increase, obtaining the power and / or speed of the fixed pitch propeller generator set, when the power and / or speed exceeds a first set value, and the exceeding time is greater than a first time, adjusting the current control mode to the next control mode by a first preset adjustment strategy; the first preset adjustment strategy is: when the current control mode is the torque mode, the next control mode is the rated speed mode, when the current control mode is the rated speed mode, the next control mode is the low rated speed mode, and when the current control mode is the low rated speed mode, the next control mode is the shutdown mode; When the tidal current flow rate decreases, causing the load to decrease, obtaining the power and / or speed of the fixed pitch propeller generator set, when the power and / or speed is less than a second set value, and the less than time is greater than a second time, adjusting the current control mode to the next control mode by a second preset adjustment strategy; the second preset adjustment strategy is: when the current control mode is the torque mode, the next control mode is the shutdown mode, when the current control mode is the rated speed mode, the next control mode is the torque mode, and when the current control mode is the low rated speed mode, the next control mode is the rated speed mode.

2. The tidal current energy generator load condition adaptive operation control method according to claim 1, characterized in that, The first time includes a first increase time, a second increase time, and a third increase time, so when the tidal current flow rate increases, causing the load to increase, obtaining the power and / or speed of the fixed pitch propeller generator set, when the power and / or speed exceeds a first set value, and the exceeding time is greater than a first time, adjusting the current control mode to the next control mode by a first preset adjustment strategy, including: When the current control mode is the torque mode, and the power of the fixed pitch propeller generator set is greater than a first power set value and / or the speed is greater than a first speed set value, the power greater than the first power set value and / or the speed greater than the first speed set value for a time greater than the first increase time, the current control mode is adjusted to the rated speed mode; When the current control mode is the rated speed mode, and the power of the fixed pitch propeller generator set is greater than a first power set value greater than a second power set value, the power greater than the second power set value for a time greater than the second increase time, the current control mode is adjusted to the low rated speed mode; When the current control mode is the low rated speed mode, and the power of the fixed pitch propeller generator set is greater than a first power set value greater than a third power set value, the power greater than the third power set value for a time greater than the third increase time, the current control mode is adjusted to the shutdown mode.

3. The tidal current energy generator load condition adaptive operation control method according to claim 2, characterized in that, The method further comprises: When the tidal current flow rate increases, causing the load to increase, it is determined whether the power of the fixed pitch propeller generator set exceeds the upper limit of the limit power and whether the time length of exceeding the upper limit of the limit power is greater than the first limit time length, and if so, the current control mode is adjusted to the low rated speed mode, the current control mode being the torque mode or the rated speed mode.

4. The tidal current energy generator load condition adaptive operation control method according to claim 3, characterized in that, The first power setting value and the second power setting value are 1.02-1.08 times of the rated power, the first speed setting value is 1.02-1.08 times of the rated speed, the third power setting value is 1.09-1.11 times of the rated power, and the upper limit of the limit power is 1.1-1.2 times of the rated power; The first increase time length and the second increase time length are 3S-7S, the third increase time length is 9S-11S, and the first limit time length is 1.5S-2.5S.

5. The tidal current energy generator load condition adaptive operation control method according to claim 1, characterized in that, The second time length includes a first decrease time length, a second decrease time length and a third decrease time length, so when the tidal current flow rate decreases, causing the load to decrease, the power and / or speed of the fixed pitch propeller generator set is obtained, when the power and / or speed is less than the second setting value, and the time length is greater than the second time length, the current control mode is adjusted to the next control mode by the second preset adjustment strategy, including: When the current control mode is the torque mode, and the power of the fixed pitch propeller generator set is less than the fourth power setting value, and the time length of the power being less than the fourth power setting value is greater than the first decrease time length, the current control mode is adjusted to the shutdown mode; When the current control mode is the rated speed mode, and the power of the fixed pitch propeller generator set is less than the fifth power setting value, and the time length of the power being less than the fifth power setting value is greater than the second decrease time length, the current control mode is adjusted to the torque mode; When the current control mode is the low rated speed mode, and the power of the fixed pitch propeller generator set is less than the sixth power setting value, and the time length of the power being less than the sixth power setting value is greater than the third decrease time length, the current control mode is adjusted to the rated speed mode.

6. The tidal current energy generator load condition adaptive operation control method according to claim 5, characterized in that, The method further comprises: When the tidal current flow rate decreases, causing the load to decrease, it is determined whether the power of the fixed pitch propeller generator set is less than the lower limit of the limit power and whether the time length of being less than the lower limit of the limit power is greater than the second limit time length, and if so, the current control mode is adjusted to the torque mode, the current control mode being the low rated speed mode or the rated speed mode.

7. The tidal current power generation load condition adaptive operation control method according to claim 6, characterized in that, The fourth power setting value and the fifth power setting value are 0.75-0.85 times of the rated power, the sixth power setting value is 0.9-0.95 times of the rated power, and the lower limit of the limit power is 0.65-0.7 times of the rated power; The first decrease time length, the second decrease time length and the third decrease time length are 3S-7S, and the second limit time length is 2.5S-3.5S.

8. The tidal current power generation load condition adaptive operation control method according to any one of claims 1-7, characterized in that, Before the first preset adjustment strategy or the second preset adjustment strategy is executed, the allocation strategy of the control mode is: When the power of the fixed pitch propeller generator set is less than the rated power, it is determined that the control mode is the torque mode; When the power of the fixed-pitch propeller generator set is greater than a power setting value, the control mode is determined to be a low-rated speed mode, and the power setting value is a preset multiple of rated power. When the power of the fixed-pitch propeller generator set is greater than or equal to rated power and less than or equal to the power setting value, the control mode is determined to be a rated speed mode.

9. The tidal current power generation load condition adaptive operation control method according to any one of claims 1-7, characterized in that, The control mode further includes an ultralow-rated speed mode, the speed of the ultralow-rated speed mode being less than the speed of the low-rated speed mode, and the first preset adjustment strategy is that: When the current control mode is the torque mode, the next control mode is the rated speed mode; when the current control mode is the rated speed mode, the next control mode is the low-rated speed mode; when the current control mode is the low-rated speed mode, the next control mode is the ultralow-rated speed mode; and when the current control mode is the ultralow-rated speed mode, the next control mode is the shutdown mode.

10. The tidal current energy generator load condition adaptive operation control method according to claim 9, characterized in that, The second preset adjustment strategy is that: When the current control mode is the torque mode, the next control mode is the shutdown mode; when the current control mode is the rated speed mode, the next control mode is the torque mode; when the current control mode is the low-rated speed mode, the next control mode is the rated speed mode; and when the current control mode is the ultralow-rated speed mode, the next control mode is the low-rated speed mode.

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