Tidal current energy power station energy management method and device

Abstract

The invention provides a tidal current energy power station energy management method and device, and belongs to the technical field of tidal current energy power generation. The method comprises the following steps: acquiring a power grid dispatching instruction, tidal current information prediction data and tidal current energy generator set operation data; recognizing a fatigue generator set and a healthy generator set according to the operation data of the tidal current energy generator set; and determining control instructions of each fatigue generator set and each healthy generator set according to the power grid dispatching instruction and the power flow information prediction data. According to the method, fatigue generator sets and healthy generator sets are identified based on operation data of tidal current energy generator sets, and control instructions of the fatigue generator sets and the healthy generator sets are determined according to a power grid dispatching instruction and tidal current information prediction data; therefore, the fatigue tidal current energy generator set in the power plant is intelligently controlled to operate or stop by actively reducing the utilization coefficient, and the other non-fatigue generator sets operate normally.

Description

Technical Field

[0001] The present invention relates to the technical field of tidal energy power generation, and in particular to an energy management method for a tidal energy power station and an energy management device for a tidal energy power station. Background Art

[0002] Tidal energy is generated by the movement of water in the ocean under the combined action of the earth's gravity and the moon's gravity. It is a renewable energy source that is widely distributed around the world and has high development potential. Tidal energy generators are devices that convert tidal energy into electrical energy. The front end of the generator is a hub with blades installed on the hub. When the tidal water flows through the blades, the blades are pushed by the water, thereby driving the hub to rotate, and the transmission chain driven by the hub rotates, and then drives the generator to generate electricity.

[0003] A tidal power station is composed of several tidal power generating units, which are connected to each other through cables. The electric energy is then collected to the power station, which then transmits it to the public power grid after voltage conversion.

[0004] As a renewable energy source, tidal power generation has developed rapidly in recent years. With the increase in the rated power of generator sets, the project cost has dropped rapidly, and the conditions for mass engineering application have been met.

[0005] However, no energy management method for tidal power generation clusters (tidal power plants) has been found in relevant literature, and the control method for batch tidal active power and reactive power is still in a blank stage and urgently needs to be filled.

[0006] With the rapid development of digital and intelligent industries, more and more scientific research institutions have begun to study the intelligent control system of small-capacity generators in batches, and to intelligently dispatch the control parameters of all generators at the height of the power station to achieve the coordination between the station control system and the generator control system, and effectively improve the safety factor and economic benefits of tidal power generation. However, research in this field is restricted by communication technology, intelligent algorithms, and hardware computing capabilities, and the limited resources invested by scientific research institutions have resulted in few related research results. Summary of the invention

[0007] The purpose of an embodiment of the present invention is to provide an energy management method and device for a tidal power plant. The method identifies fatigued generator sets and healthy generator sets based on the operating data of tidal power generator sets, and determines the control instructions of each fatigued generator set and healthy generator set according to the grid dispatching instructions and tidal information prediction data, so as to realize intelligent control of fatigued tidal power generator sets in the power plant to actively reduce the utilization factor or shut down, while the other non-fatigue generator sets operate normally.

[0008] In order to achieve the above object, the present invention provides a tidal power plant energy management method in a first aspect, the method comprising: Obtain power grid dispatching instructions, power flow information forecast data, and power generation unit operation data; Identify fatigued and healthy generators based on the operating data of tidal power generators; The control instructions for each fatigue generator set and healthy generator set are determined according to the grid dispatching instructions and power flow information prediction data.

[0009] According to the above technical means, the method identifies fatigued generator sets and healthy generator sets based on the operating data of tidal energy generator sets, and determines the control instructions of each fatigued generator set and healthy generator set according to the grid dispatching instructions and tidal information prediction data, so as to realize intelligent control of fatigued tidal energy generator sets in the power plant to actively reduce the utilization factor or shut down, while the other non-fatigue generator sets operate normally.

[0010] In some feasible embodiments, the unit operation data includes at least generator temperature, gearbox temperature, generator bearing temperature, pitch bearing temperature, pitch motor temperature, pitch servo temperature, continuous pitch time, total pitch degrees, and switch pitch times; The method of identifying fatigued generator sets and healthy generator sets according to the operation data of tidal energy generator sets includes: The pitch fatigue coefficient of each generator set is calculated based on the generator temperature, gearbox temperature, generator bearing temperature, pitch bearing temperature, pitch motor temperature, pitch servo temperature, continuous pitch time, total pitch degrees and number of pitch switches; The pitch fatigue coefficient is compared with a preset fatigue threshold. If the pitch fatigue coefficient is greater than the preset value, the corresponding generator set is determined to be a fatigue generator set. Otherwise, the corresponding generator set is a healthy generator set.

[0011] According to the above technical means, generator temperature, gearbox temperature, generator bearing temperature, pitch bearing temperature, pitch motor temperature, pitch servo temperature, continuous pitch time, total pitch degree and number of switch pitches are all parameters that affect pitch fatigue. The pitch fatigue coefficient determined by these parameters can well characterize the pitch fatigue degree of the generator set. Based on the pitch fatigue coefficient, fatigued generator sets and healthy generator sets can be well distinguished.

[0012] In some feasible embodiments, the power grid dispatch instruction includes the power of the tidal power station, and the tidal information prediction data includes the tidal speed; Determine the control instructions for each unit based on the grid dispatch instructions and power flow information forecast data, including: Determine whether the current tidal energy power station is subject to power restriction based on the grid dispatching instructions and tidal information forecast data; In the case of power cuts, the power output of each fatigue generator set in the current tidal power station is determined according to the station power of the tidal power station; The control instructions of each unit in the current tidal power station are determined according to the power output of each generator unit.

[0013] According to the above technical means, it is possible to determine whether the current tidal power station is subject to power restriction, and in the case of power restriction, differential control can be performed according to the power output of different units.

[0014] In some feasible embodiments, determining whether the current tidal energy power station is subject to power restriction according to the grid dispatching instruction and the tidal information prediction data includes: Obtain the available power of each generator set by looking up the table according to the tidal velocity; Calculate the sum of the available power generation of all the generator sets in the current tidal energy power station as the available power of the current tidal energy power station; Compare the available power of the current tidal energy power station with the site power of the tidal energy power station. If the site power of the tidal energy power station is greater than the available power of the current tidal energy power station, it is determined that the current tidal energy power station is not subject to power restriction. If the site power of the tidal energy power station is less than the available power of the current tidal energy power station, it is determined that the current tidal energy power station is subject to power restriction.

[0015] According to the above technical means, the power generation power of each generator set when it is working normally can be obtained by looking up the table according to the predicted tidal speed. If the available power of the current tidal energy station is greater than the station power of the tidal energy station, it is necessary to limit the power supply of the current tidal energy station so that the power generation power of the current tidal energy station does not exceed the power supply demand.

[0016] In some feasible embodiments, determining the power output of each generator set in the current tidal power station according to the station power of the tidal power station includes: Calculate the available power of healthy generators in the current tidal power station; Calculating a first difference between the power of the tidal power plant and the available power of the healthy generator sets; Determining the number of fatigue generator sets to be started according to the first difference and the available power of each fatigue generator set; Sort the fatigue generator sets according to their pitch fatigue coefficients; The power output of fatigue generator sets that meet the number of units started is determined according to the pitch fatigue coefficient from small to large, and other fatigue generator sets are shut down to restore the pitch fatigue coefficient.

[0017] According to the above technical means, when it is determined that the current tidal energy power station is power-limited, the number of fatigue generators that need to be powered is determined according to the power of the tidal energy power station, and the fatigue generator sets with lower fatigue coefficients are rotated to operate and power is output, while other fatigue generator sets are shut down to restore the pitch fatigue coefficient. In this way, while ensuring that the power generation of the tidal energy power station meets the needs of the power grid, some units can be shut down to reduce pitch fatigue, so as to improve the power generation capacity of the tidal energy power station during peak power consumption and reduce the probability of fatigue failures.

[0018] In some feasible embodiments, determining the number of fatigue generator sets to be started according to the difference and the available power of each fatigue generator set includes: The ratio of the difference to the available power of each fatigue generator set is calculated, and the ratio is rounded up and added to obtain the number of started fatigue generator sets.

[0019] According to the above technical means, on the basis of accurately calculating the number of units to be started according to the difference, another generator set is added as a backup to ensure that the power generation of the tidal energy power station meets the needs of the power grid when the tidal speed fluctuates.

[0020] In some feasible embodiments, the control instructions of each fatigue generator set and healthy generator set in the current tidal power station are determined according to the power output of each generator set, including: For a fatigue generator set that needs to produce power, a first control parameter structure of the fatigue generator set is calculated according to the tidal current speed, wherein the first control parameter structure includes: a fixed pitch angle value, an upper limit of an active power target value, and a lower limit of an active power target value; Calculate the work power of the fatigue generator set according to the first control parameter structure; Calculating a second difference between the station power and the output power of the tidal energy power station; Calculate a second control parameter structure of the healthy generator set according to the second difference; According to the first control parameter structure, the second control parameter structure generates control instructions corresponding to the fatigue generator set and the healthy generator set; Generate a shutdown command for the fatigue generator set that needs to be shut down.

[0021] According to the above technical means, a fixed pitch angle value is used for fatigue generator sets to reduce pitch and pitch fatigue. The control parameter structure of the fatigue generator set is determined first, and then the control parameter structure of the healthy generator set is determined. The healthy generator set has low pitch fatigue and is not prone to pitch failure, so as to ensure that the current tidal power station power generation rate matches the tidal power station site power.

[0022] In some possible embodiments, the method further includes: After the fatigue generator set receives the first control parameter structure, it determines whether the adjustment range is greater than the preset value and lasts for a preset time. If the adjustment range is less than the preset value, the first control parameter structure of the fatigue generator set is recalculated according to the tidal current speed.

[0023] According to the above technical means, by adjusting the first control parameter structure, it is ensured that the fatigue generator set only needs to be roughly adjusted, thereby reducing the pitch fatigue caused by this pitch change.

[0024] In some feasible embodiments, the power flow information prediction data includes ultra-short-term power flow speed, and the unit operation data includes instantaneous power flow speed; In the absence of power restriction, determine whether the instantaneous power flow speed and ultra-short-term power flow speed of the generator set are greater than the rated power flow speed. If greater than the rated power flow speed, calculate the control parameter structure of the fatigue generator set according to the rated power flow speed.

[0025] According to the above technical means, when there is no power restriction, the propeller can be changed according to the tidal speed to ensure the safe operation of the generator set.

[0026] A second aspect of the present application provides an energy management device for a tidal power station, the device comprising: An acquisition unit, used to acquire power grid dispatching instructions, power flow information prediction data, and power flow generator operation data; A generator set identification unit, used for identifying a fatigue generator set and a healthy generator set according to the operation data of the tidal energy generator set; The control instruction determination unit is used to determine the control instructions of each fatigue generator set and healthy generator set according to the power grid dispatching instruction and the power flow information prediction data.

[0027] Through the above technical scheme, the method identifies fatigued generator sets and healthy generator sets based on the operating data of tidal energy generator sets, and determines the control instructions of each fatigued generator set and healthy generator set according to the grid dispatching instructions and tidal information prediction data, so as to realize intelligent control of fatigued tidal energy generator sets in the power plant to actively reduce the utilization factor or shut down, while the other non-fatigue generator sets operate normally.

[0028] Other features and advantages of the embodiments of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings are used to provide a further understanding of the embodiments of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the embodiments of the present invention, but do not constitute a limitation on the embodiments of the present invention. In the accompanying drawings: Figure 1It is a flow chart of a tidal power station energy management method provided by one embodiment of the present invention; Figure 2 It is a block diagram of an energy management device for a tidal power station provided in one embodiment of the present invention. DETAILED DESCRIPTION

[0030] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0031] Traditional tidal power plants do not have energy management functions, resulting in poor grid connection performance. The design of tidal power plant energy management systems should fully consider the health of power generation equipment, especially in the power control process, the operating fatigue of the variable pitch system should be reduced.

[0032] Traditional energy management methods lack attention to the health status of power generation equipment in active power control. The control system of a single generator set is relatively isolated and limited in conditions. The way to deal with such problems has certain limitations. Therefore, this application introduces an advanced coordinated control method based on the health assessment of power generation equipment to solve such problems. When performing active power control on a generator set, it is usually necessary to use real-time pitch control technology to limit the capture of tidal energy so as to achieve the active target value that the generator set needs to execute. This control strategy will cause the generator's pitch control system to operate frequently, thereby aggravating the mechanical wear of the pitch mechanism and causing mechanical fatigue, resulting in a shortened operating life of the generator set and even affecting the stable operation of the unit.

[0033] The pitch mechanism of the horizontal axis variable pitch tidal energy generator is basically composed of a pitch control cabinet, a pitch bearing, a pitch drive, etc. The pitch system is one of the core parts of the generator set and plays a very important role in the safe, stable and efficient operation of the unit. In simple terms, the pitch control technology is to change the angle of attack of the water flow on the blade by adjusting the pitch angle of the blade, thereby controlling the hydrodynamic torque and hydrodynamic power captured by the impeller.

[0034] The present application provides an energy management method for a tidal power plant. The method identifies fatigued generator sets and healthy generator sets based on the operating data of tidal power generator sets, and determines control instructions for each fatigued generator set and healthy generator set according to grid dispatching instructions and tidal information prediction data, so as to realize intelligent control of fatigued tidal power generator sets in a power plant to actively reduce the utilization factor or shut down, while the other non-fatigued generator sets operate normally.

[0035] Figure 1 This is a flow chart of a tidal power plant energy management method provided by one embodiment of the present invention. Figure 1 As shown, the method includes: S1: Obtain grid dispatching instructions, tidal current information forecast data, and tidal current energy generator operation data. In some feasible embodiments, the grid dispatching instructions are issued by the grid dispatching center to the tidal current energy power station. The main task of the grid dispatching center is to maintain the balance between power generation and load at all times, and requires each department under the dispatching jurisdiction to strictly complete the dispatching tasks. The grid dispatching center conducts a full system load forecast for the next 24 or 48 hours based on historical data of load changes, weather forecasts, analysis of electricity production conditions, and social life patterns, and then formulates power generation tasks and operation plans. The operation plan is based on the predicted load curve and the principle of economic dispatch to reasonably plan and arrange traditional fuel power sources and new energy power sources, and allocate power generation tasks to each power plant.

[0036] In this architecture, the grid dispatching center sends the power generation plan and real-time peak-shaving instructions to the energy management system of the tidal power station, which can inform the power station in advance of key information such as when to cut power and the approximate extent of the power cut.

[0037] In some feasible embodiments, the power flow information prediction data is predicted by the power plant meteorological prediction system and sent to the power grid dispatching center and the power plant energy management system.

[0038] The meteorological forecast system of the power station predicts the tidal velocity and direction of the power station based on the actual data and model data. The actual data mainly includes physical quantities such as tidal velocity, temperature, wind speed, and air pressure, and the model data is the forecast data generated by the application of computer programs. The system uses physical simulation calculations and scientific statistical methods to make advance forecasts of the tidal velocity and direction of the power station, thereby predicting the future power of the power station, and transmits these forecast data to the power grid dispatching center and the tidal power station energy management system. The power grid dispatching center combines these operation plans and many other control targets to feedback the dispatching instructions to the tidal power station energy management system.

[0039] In some feasible embodiments, the operating data of the tidal power generating units is collected by the energy management system of the tidal power station. The energy management system of the tidal power station obtains the power generation plan data of the power grid dispatch, the weather forecast system data and the operating data of all the generating units in the power station in real time, and combines these key information to decide which units will operate at a fixed pitch angle and when when the power station participates in the peak load and power rationing of the power system, so as to ensure that the units will not fail and shut down due to excessive fatigue of the variable pitch system when operating at full power or power rationing.

[0040] In this architecture, the power plant-level control system uses predictive data to decide which units to reallocate reasonable power generation and when to control small or large currents.

[0041] S2: Identify fatigued generator sets and healthy generator sets based on the operating data of tidal energy generator sets.

[0042] In some feasible embodiments, the unit operation data includes at least generator temperature, gearbox temperature, generator bearing temperature, pitch bearing temperature, pitch motor temperature, pitch servo temperature, continuous pitch time, total pitch degrees, and switch pitch times; The method of identifying fatigued generator sets and healthy generator sets according to the operation data of tidal energy generator sets includes: The pitch fatigue coefficient of each generator set is calculated based on the generator temperature, gearbox temperature, generator bearing temperature, pitch bearing temperature, pitch motor temperature, pitch servo temperature, continuous pitch time, total pitch degrees and number of pitch switches; The pitch fatigue coefficient is compared with a preset fatigue threshold. If the pitch fatigue coefficient is greater than the preset value, the corresponding generator set is determined to be a fatigue generator set. Otherwise, the corresponding generator set is a healthy generator set.

[0043] According to the above technical means, generator temperature, gearbox temperature, generator bearing temperature, pitch bearing temperature, pitch motor temperature, pitch servo temperature, continuous pitch time, total pitch degree and number of switch pitches are all parameters that affect pitch fatigue. The pitch fatigue coefficient determined by these parameters can well characterize the pitch fatigue degree of the generator set. Based on the pitch fatigue coefficient, fatigued generator sets and healthy generator sets can be well distinguished.

[0044] S3: Determine the control instructions for each fatigue generator set and healthy generator set according to the grid dispatching instructions and power flow information prediction data.

[0045] In some feasible embodiments, the power grid dispatch instruction includes the power of the tidal power station, and the tidal information prediction data includes the tidal speed; Determine the control instructions for each unit based on the grid dispatch instructions and power flow information forecast data, including: First, determine whether the current tidal energy power station is power-restricted based on the grid dispatching instructions and tidal information forecast data, including: The available power generation of each generator set can be obtained by looking up the table according to the tidal velocity. The available power generation can be obtained by querying the tidal velocity-power curve.

[0046] Calculate the sum of the available power generation of all the generator sets in the current tidal energy power station as the available power of the current tidal energy power station; Compare the available power of the current tidal energy power station with the site power of the tidal energy power station. If the site power of the tidal energy power station is greater than the available power of the current tidal energy power station, it is determined that the current tidal energy power station is not subject to power restriction. If the site power of the tidal energy power station is less than the available power of the current tidal energy power station, it is determined that the current tidal energy power station is subject to power restriction. Thus, the power generation power of each generator set when operating normally can be obtained by looking up the table according to the predicted tidal speed. If the available power of the current tidal energy power station is greater than the site power of the tidal energy power station, it is necessary to limit the power of the current tidal energy power station so that the power generation power of the current tidal energy power station does not exceed the power supply demand.

[0047] Then, in the case of power restriction, the power output of each fatigue generator set in the current tidal power station is determined according to the station power of the tidal power station, including: The available power of healthy generator sets in the current tidal power station is calculated. The available power of healthy generator sets can be obtained by first looking up the table according to the tidal speed to obtain the available power of each healthy generator set, and then summing up the available power of all healthy generator sets.

[0048] Calculating a first difference between the power of the tidal power plant and the available power of the healthy generator sets; Determining the number of fatigue generator sets to be started according to the first difference and the available power of each fatigue generator set specifically includes: The ratio of the difference to the available power of each fatigue generator set is calculated, and the number of fatigue generator sets in operation is obtained by rounding up and adding 1. Therefore, on the basis of accurately calculating the number of in-operation units according to the difference, one more generator set is added as a backup to ensure that the power generation of the tidal energy station meets the power grid demand when the tidal speed fluctuates.

[0049] The fatigue generator sets are sorted according to the pitch fatigue coefficient of each fatigue generator set. In some feasible embodiments, the generator sets may be sorted from large to small according to the pitch fatigue coefficient, or may be sorted from small to large according to the pitch fatigue coefficient.

[0050] According to the pitch fatigue coefficient from small to large, the power output of the fatigue generator set that meets the number of start-up units is determined, and the other fatigue generator sets are shut down to restore the pitch fatigue coefficient. For example, assuming that there are 5 fatigue generator sets and the calculated number of start-up units is 3, the power output of the 3 fatigue generator sets with smaller pitch fatigue coefficients is determined.

[0051] Therefore, when it is determined that the current tidal energy power station is power-limited, the number of fatigue generators that need to be powered is determined according to the power of the tidal energy power station, and the fatigue generator sets with lower fatigue coefficients are rotated to operate and power is output, while other fatigue generator sets are shut down to restore the pitch fatigue coefficient. In this way, while ensuring that the power generation of the tidal energy power station meets the needs of the power grid, some units can be shut down to reduce pitch fatigue, so as to improve the power generation capacity of the tidal energy power station during peak power consumption and reduce the probability of fatigue failures.

[0052] Finally, the control instructions of each unit in the current tidal power station are determined according to the power output of each generator set, including: For fatigue generator sets that need to produce power, the first control parameter structure of the fatigue generator set is calculated according to the tidal velocity, and the first control parameter structure includes: fixed pitch angle value, active target value upper limit, and active target value lower limit. The generator set will refer to this set of control instructions for active power control. The active power of the set running at a fixed pitch angle should always be kept within the upper and lower limits of the active target value. If it exceeds this range, the field-level control will set a new control parameter structure according to the actual situation.

[0053] Calculate the work power of the fatigue generator set according to the first control parameter structure; Calculating a second difference between the station power and the output power of the tidal energy power station; Calculate a second control parameter structure of the healthy generator set according to the second difference; According to the first control parameter structure, the second control parameter structure generates control instructions corresponding to the fatigue generator set and the healthy generator set; Generate a shutdown command for the fatigue generator set that needs to be shut down.

[0054] According to the above technical means, a fixed pitch angle value is used for fatigue generator sets to reduce pitch change and pitch fatigue. The control parameter structure of the fatigue generator set is first determined, and then the control parameter structure of the healthy generator set is determined. The healthy generator set has low pitch fatigue and is not prone to pitch failure, so as to ensure that the current tidal power station power generation rate matches the tidal power station site power. The above technical solution can determine whether the current tidal power station is subject to power restriction, and in the case of power restriction, perform differential control according to the power output of different units.

[0055] This method identifies fatigued generator sets and healthy generator sets based on the operating data of tidal energy generator sets, and determines the control instructions for each fatigued generator set and healthy generator set according to the grid dispatching instructions and tidal information prediction data, so as to realize intelligent control of fatigued tidal energy generator sets in the power plant to actively reduce the utilization factor or shut down, while the other non-fatigued generator sets operate normally.

[0056] In some possible embodiments, the method further includes: After the fatigue generator set receives the first control parameter structure, it is determined whether the adjustment range is greater than the preset value and lasts for a preset time. If the adjustment range is less than the preset value, the first control parameter structure of the fatigue generator set is recalculated according to the tidal current speed. Generally, the preset value is 10% Pn (rated capacity of the power plant) and lasts for 3 seconds.

[0057] According to the above technical means, by adjusting the first control parameter structure, it is ensured that the fatigue generator set only needs to be roughly adjusted, thereby reducing the pitch fatigue caused by this pitch change.

[0058] In some feasible embodiments, the power flow information prediction data includes ultra-short-term power flow speed, and the unit operation data includes instantaneous power flow speed; In the absence of power restriction, determine whether the instantaneous power flow speed and ultra-short-term power flow speed of the generator set are greater than the rated power flow speed. If greater than the rated power flow speed, calculate the control parameter structure of the fatigue generator set according to the rated power flow speed.

[0059] According to the above technical means, when there is no power restriction, the propeller can be changed according to the tidal speed to ensure the safe operation of the generator set.

[0060] Since the power station is not in a power-limited state, it is necessary to monitor the speed and active power of the Class A fatigue unit in real time during the fixed pitch angle operation to consider whether the generator set as a whole is within the safety threshold. If it is not within the safety threshold, the field-level control system must re-issue a new control parameter structure.

[0061] In some feasible embodiments, the pitch fatigue coefficient of the stopped fatigue unit will continue to decrease. When it drops to a certain range, the field-level controller will scan the unit's status monitoring results to meet the requirements, and the unit will be included in the range of power-up standby units for the next cycle of power-up intelligent decision-making. If the fatigue coefficient does not drop to the expected threshold for a long time, a manual alarm will be issued to request the operation and maintenance technicians to analyze the data again and input the verification results into the system.

[0062] In some feasible embodiments, if the difference between the pitch fatigue coefficients calculated by each generator set with pitch fatigue is less than a preset value, that is, the pitch fatigue coefficients of each generator set are relatively close, then the generator set to be started can be determined by performing a refined evaluation of each component of the pitch system. In this evaluation method, a method for judging component fatigue by the number of pitch changes and the total pitch mileage is proposed based on a deep learning algorithm. A brief introduction is to identify whether the fatigue of this pitch action is normal by comparing historical big data; to identify whether the equipment is more likely to have a high temperature change momentum at the same number of pitch changes and mileage as the equipment runs. If such a momentum is detected, this information will be fed back in time and the data will be stored to form an alarm level record. For example, the motor of Class B insulation material has an allowable operating temperature of 130°C. Generally speaking, the allowable temperature range of pitch change during continuous operation is about -20°C-130°C. If the temperature exceeds this range, the motor will overheat, resulting in performance degradation or damage. The normal operating temperature of the pitch drive is -20°C-80°C. If this range is exceeded, the device will be in a fatigue state. The evaluated various pitch fatigue information is recorded in the system database and displayed to the user through the interface for subsequent predictive maintenance.

[0063] The fatigue coefficient is calculated based on the design value, warning value, and fault value of information such as the pitch motor temperature, pitch bearing temperature, number and mileage of drive actions, and total pitch degrees.

[0064] The variable pitch sub-components with abnormal data will be monitored in detail, and the conditions for starting the evaluation and analysis model will be reduced; the data will be recorded in a real-time database and used as input parameters for the intelligent control of the power station; based on the evaluation results, predictive maintenance guidance for the variable pitch system will be given, and these components will be carefully checked when the operation and maintenance personnel perform regular inspections or fault maintenance, thereby playing a role in predictive maintenance and avoiding major safety issues caused by failure of the variable pitch system.

[0065] When determining whether the corresponding generator set is working, the optimal determination can be made based on the number of fatigue components of each generator set, the importance of each fatigue component, etc. The more fatigue components there are, the more shutdown recovery is required; the more important the fatigue components are, the more shutdown recovery is required.

[0066] The second aspect of the present application provides an energy management device for a tidal power station, such as Figure 2 As shown, the device comprises: An acquisition unit, used to acquire power grid dispatching instructions, power flow information prediction data, and power flow generator operation data; A generator set identification unit, used for identifying a fatigue generator set and a healthy generator set according to the operation data of the tidal energy generator set; The control instruction determination unit is used to determine the control instructions of each fatigue generator set and healthy generator set according to the power grid dispatching instruction and the power flow information prediction data.

[0067] The embodiment of the present invention further provides a machine-readable storage medium on which computer program instructions are stored. When the computer program instructions are executed by a processor, the above-mentioned tidal power station energy management method is implemented.

[0068] Those skilled in the art will understand that all or part of the steps in the method for implementing the above-mentioned embodiments can be completed by instructing the relevant hardware through a program, and the program is stored in a storage medium, including several instructions for making a single-chip microcomputer, a chip or a processor (processor) execute all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0069] The optional embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the embodiments of the present invention are not limited to the specific details in the above embodiments. Within the technical concept of the embodiments of the present invention, the technical scheme of the embodiments of the present invention can be subjected to a variety of simple modifications, and these simple modifications all belong to the protection scope of the embodiments of the present invention. It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the embodiments of the present invention will not further describe various possible combinations.

[0070] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the embodiments of the present invention, they should also be regarded as the contents disclosed in the embodiments of the present invention.

Claims

1. A tidal power station energy management method, characterized in that: The method comprises: Obtain power grid dispatching instructions, power flow information forecast data, and power generation unit operation data; Identify fatigued and healthy generators based on the operating data of tidal power generators; The control instructions for each fatigue generator set and healthy generator set are determined according to the grid dispatching instructions and power flow information prediction data.

2. The energy management method of a tidal power station according to claim 1, characterized in that: The unit operation data at least includes generator temperature, gearbox temperature, generator bearing temperature, pitch bearing temperature, pitch motor temperature, pitch servo temperature, continuous pitch time, total pitch degrees and switch pitch times; The method of identifying fatigued generator sets and healthy generator sets according to the operation data of tidal energy generator sets includes: The pitch fatigue coefficient of each generator set is calculated based on the generator temperature, gearbox temperature, generator bearing temperature, pitch bearing temperature, pitch motor temperature, pitch servo temperature, continuous pitch time, total pitch degrees and number of pitch switches; The pitch fatigue coefficient is compared with a preset fatigue threshold. If the pitch fatigue coefficient is greater than the preset value, the corresponding generator set is determined to be a fatigue generator set. Otherwise, the corresponding generator set is a healthy generator set.

3. The energy management method of a tidal power station according to claim 2, characterized in that: The power grid dispatching instruction includes the power of the tidal energy power station, and the tidal information prediction data includes the tidal speed; Determine the control instructions for each unit based on the grid dispatch instructions and power flow information forecast data, including: Determine whether the current tidal energy power station is subject to power restriction based on the grid dispatching instructions and tidal information forecast data; In the case of power cuts, the power output of each fatigue generator set in the current tidal power station is determined according to the station power of the tidal power station; The control instructions of each unit in the current tidal power station are determined according to the power output of each generator unit.

4. The energy management method of a tidal power station according to claim 3, characterized in that: The determining whether the current tidal energy power station is power-limited according to the grid dispatching instruction and the tidal information prediction data includes: Obtain the available power of each generator set by looking up the table according to the tidal velocity; Calculate the sum of the available power generation of all the generator sets in the current tidal energy power station as the available power of the current tidal energy power station; Compare the available power of the current tidal energy power station with the site power of the tidal energy power station. If the site power of the tidal energy power station is greater than the available power of the current tidal energy power station, it is determined that the current tidal energy power station is not subject to power restriction. If the site power of the tidal energy power station is less than the available power of the current tidal energy power station, it is determined that the current tidal energy power station is subject to power restriction.

5. The energy management method of a tidal power station according to claim 3, characterized in that: According to the power of the tidal power station, the power output of each generator set in the current tidal power station is determined, including: Calculate the available power of healthy generators in the current tidal power station; Calculating a first difference between the power of the tidal power plant and the available power of the healthy generator sets; Determining the number of fatigue generator sets to be started according to the first difference and the available power of each fatigue generator set; Sort the fatigue generator sets according to their pitch fatigue coefficients; The power output of fatigue generator sets that meet the number of units started is determined according to the pitch fatigue coefficient from small to large, and other fatigue generator sets are shut down to restore the pitch fatigue coefficient.

6. The energy management method of a tidal power station according to claim 5, characterized in that: The step of determining the number of fatigue generator sets to be started according to the difference and the available power of each fatigue generator set comprises: The ratio of the difference to the available power of each fatigue generator set is calculated, and the ratio is rounded up and then added to obtain the number of started fatigue generator sets.

7. The energy management method of a tidal power station according to claim 5, characterized in that: According to the power output of each generator set, the control instructions of each fatigue generator set and healthy generator set in the current tidal power station are determined, including: For a fatigue generator set that needs to produce power, a first control parameter structure of the fatigue generator set is calculated according to the tidal current speed, wherein the first control parameter structure includes: a fixed pitch angle value, an upper limit of an active power target value, and a lower limit of an active power target value; Calculate the work power of the fatigue generator set according to the first control parameter structure; Calculating a second difference between the station power and the output power of the tidal energy power station; Calculate a second control parameter structure of the healthy generator set according to the second difference; According to the first control parameter structure, the second control parameter structure generates control instructions corresponding to the fatigue generator set and the healthy generator set; Generate a shutdown command for the fatigue generator set that needs to be shut down.

8. The energy management method of a tidal power station according to claim 7, characterized in that: The method further comprises: After the fatigue generator set receives the first control parameter structure, it determines whether the adjustment range is greater than the preset value and lasts for a preset time. If the adjustment range is less than the preset value, the first control parameter structure of the fatigue generator set is recalculated according to the tidal current speed.

9. The energy management method of a tidal power station according to claim 3, characterized in that: The power flow information prediction data includes ultra-short-term power flow speed, and the unit operation data includes instantaneous power flow speed; In the absence of power restriction, determine whether the instantaneous power flow speed and the ultra-short-term power flow speed of the generator set are greater than the rated power flow speed. If they are greater than the rated power flow speed, calculate the control parameter structure of the fatigue generator set according to the rated power flow speed.

10. An energy management device for a tidal power station, characterized in that: The device comprises: An acquisition unit, used to acquire power grid dispatching instructions, power flow information prediction data, and power flow generator operation data; A generator set identification unit, used for identifying a fatigue generator set and a healthy generator set according to the operation data of the tidal energy generator set; The control instruction determination unit is used to determine the control instructions of each fatigue generator set and healthy generator set according to the power grid dispatching instruction and the power flow information prediction data.

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