Method for managing and controlling a power generator set based on wave energy and tidal energy for complementary power generation

Abstract

The application discloses a method for controlling and managing a power generating set based on wave energy and tidal energy to realize complementary power generation, comprising the steps of data acquisition, calculation, monitoring I, regulation I, judgment, regulation II, regulation III, monitoring II, monitoring III and feedback. The application realizes basic energy replacement and complementation, reduces power grid impact, improves overall energy utilization, meets local load demand, improves power supply reliability and power quality, is conducive to maintaining continuous power supply, and thus improves the stability of power generation system output power, by monitoring whether the current time is a tidal low period or a wave low period, complementary regulation of tidal energy and wave energy, and further balancing power generation power by scheduling energy storage devices.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of new energy power generation, in particular to a method for managing and controlling a power generation unit based on wave energy and tidal energy for complementary power generation. BACKGROUND

[0002] The energy of wave energy and tidal current energy is generated by the movement of seawater. Wave energy is generated by the heaving motion of seawater, while tidal current energy is generated by the lateral flow of seawater. The wave energy capture device moves under the action of waves, and the turbine blades move around the turbine shaft under the action of sea currents, thereby converting wave energy and tidal current energy into mechanical energy. The key technologies for complementary power generation of wave energy and tidal current energy include power generator design, energy management system, and overall control strategy. Through technological innovation and system optimization, the power generation efficiency and economy can be effectively improved, and the widespread application of marine renewable energy can be promoted.

[0003] The energy utilized by the wave energy and tidal current energy power generation device coexists in the sea area and does not interfere with each other in the capture mode. The two kinds of energy can be coupled and output, which can improve the unit energy output, improve the sea space utilization rate, smooth the power output fluctuation, and reduce the construction and maintenance cost. Therefore, the wave energy and tidal current energy complementary power generation device has realizability and development prospect. The wave energy and tidal current energy complementary power generation device needs to comprehensively consider the platform safety, sea space utilization efficiency, and energy conversion efficiency, can fully utilize the valuable and limited sea space, and can provide clean and reliable power energy. Therefore, the wave energy and tidal current energy complementary power generation system is an important research direction at present.

[0004] The power generation environment of wave energy and tidal current energy is complex, which puts special requirements on the design of the power generation unit. The wave energy has high energy density but fluctuates dramatically, has strong randomness, and has significant intermittency. It is affected by wind speed, wind direction, duration, seabed topography, etc., resulting in extremely unstable output power of single machine or array, large impact on power grid, and low utilization rate. Tidal energy has strong predictability but has obvious intermittency, with zero or very low output during flat tide and stop tide periods. Relying on any one kind of energy alone is difficult to provide continuous and stable power output, and large-capacity energy storage or other power sources are needed for peak shaving, which is costly.

[0005] In the prior art, the research on wave energy and tidal energy hybrid power generation system mainly focuses on real-time collection of field meteorological data by using sensors, and then adjusting the operating state of the wave energy and tidal energy power generation device. In the face of the scheduling demand of the power grid, the environmental conditions such as ocean and weather are monitored and analyzed, the energy change degree of wave energy, tidal energy or other energy is monitored, the power distribution of the power generation unit is adjusted, and then the energy is output to the power grid, thereby making up for the intermittency defects of traditional single energy system.

[0006] According to the technical scheme, the wave energy and the tidal energy have different intermittency and volatility, and change due to environmental changes, the existing wave energy and tidal energy hybrid power generation system lacks a collaborative control strategy for complementary power generation of the two, which is easy to cause a large impact on the power grid and difficult to maintain the continuous supply of power, thereby reducing the stability of the output power of the power generation system. SUMMARY

[0007] The present application aims to provide a management and control method of a power generation unit based on wave energy and tidal energy for complementary power generation to solve the problems raised in the background art.

[0008] The management and control method of the power generation unit based on wave energy and tidal energy for complementary power generation provided by the present application realizes the application purpose by adopting the following technical scheme:

[0009] The management and control method of the power generation unit based on wave energy and tidal energy for complementary power generation comprises the following steps:

[0010] Data acquisition: acquire the flow rate of the tide at time t as , the wave height of the wave as , the wave period as , the safe power X of the tidal energy power generation unit, the safe power Y of the wave energy power generation unit, and the load power P of the local power grid.

[0011] Calculation: calculate the tidal energy power generation capacity at time t as , wherein, ρ is the density of seawater, is the tidal energy conversion efficiency, R is the radius of the turbine rotor, and the wave energy power generation capacity is calculated as , wherein, is the wave energy conversion efficiency, and K is the correction coefficient, and g is the gravitational acceleration.

[0012] Monitoring I: if it is monitored that time t is the low tide period, it is judged that the tidal energy is insufficient, otherwise, it is judged that the tidal energy is sufficient, if it is monitored that time t is the wave low period, it is judged that the wave energy is insufficient, otherwise, it is judged that the wave energy is sufficient.

[0013] Regulation I: if the tidal energy is sufficient and the wave energy is sufficient, the set power of the tidal energy power generation unit at time t is , and the set power of the wave energy power generation unit at time t is ;

[0014] If the tidal energy is sufficient and the wave energy is insufficient, then , and is reduced in proportion;

[0015] If the tidal energy is insufficient and the wave energy is sufficient, then is reduced in proportion, and ;

[0016] If the tidal energy is insufficient, the wave energy is insufficient, then and proportionally reduce.

[0017] Determination: the total power generation power set value at time t is , if , it is determined that the power generation is balanced or insufficient, and the energy storage device is discharged to the power grid, and the discharge power is , if , it is determined that the power generation is excessive, and the energy storage device absorbs the power surplus.

[0018] By adopting the above technical scheme, real-time acquisition of various environmental data and equipment data is realized, the actual power generation power of the unit under the current environmental condition is calculated, and it is constrained within the safety threshold, thereby protecting the power generation unit, preventing it from running under overload, prolonging the service life, providing reliable data for subsequent power distribution, reducing the probability of low or invalid execution of control instructions, and realizing complementary regulation of tidal energy and wave energy through monitoring whether the current time is a tidal low period or a wave low period, and scheduling the energy storage device to further balance the power generation power. Compared with the prior art of simply connecting the two in parallel and controlling the start and stop of the power generation unit, the variation curve of the total output power is significantly smoothed, the power grid impact is reduced, the overall energy utilization rate is improved, the energy storage system is used as a means to further balance the power grid, the power generation system has a flexible output space, in special environment, when one kind of energy fails due to being in a low period, the total power is not easy to drop sharply, the local load demand can be preferentially met, the power supply reliability and power quality are improved, which is conducive to maintaining the continuous supply of electricity, thereby improving the stability of the output power of the power generation system.

[0019] Optionally, it further comprises a regulation II step and a regulation III step, in the judgment step, when it is determined that the power generation is excessive, the regulation II step is executed;

[0020] Regulation II: calculate the power surplus , if the energy storage device can completely absorb the surplus, then the surplus power is stored in the energy storage device preferentially, the surplus is reduced to 0, and then the regulation is ended, if the energy storage device cannot completely absorb the surplus, then the surplus after absorption is updated, and the regulation III step is executed;

[0021] Regulation III: if , the tidal energy power generation unit set power is preferentially maintained, and the wave energy power generation unit set power is reduced, if , the wave energy power generation unit set power is preferentially maintained, and the tidal energy power generation unit set power is reduced.

[0022] By adopting the above technical solutions, when there is a power surplus, priority is given to absorbing it using energy storage devices, thereby reducing the waste of renewable resources, realizing energy transfer to supply the power generation system in the event of future energy shortages, maximizing the utilization rate of renewable energy, improving the economic benefits of the power plant, minimizing the frequency of derating operations on generator units, allowing power generation equipment to operate in its high-efficiency range for a longer period of time, improving the system's operating efficiency, and being more economical and environmentally friendly compared to direct energy curtailment or start-stop of units. When the energy storage system cannot fully absorb the surplus, the power of specific units is selectively reduced based on the power magnitude of the two, thus prioritizing the protection of units with higher conversion efficiency, more stable output, or lower maintenance costs. For example, if the decision is "prioritize maintaining tidal power generation and reduce wave power generation," then... "Tidal power generation" utilizes the greater regularity and higher predictability of tidal energy to provide the power grid with a more stable and reliable power baseline. Tidal turbines operate smoothly and efficiently, and excessive deceleration can cause additional damage to components such as bearings. In contrast, wave energy devices themselves fluctuate greatly, and their energy conversion devices, such as hydraulic systems, are easier to adjust. By using the more random and volatile wave energy as an adjustable marginal power source, the system's output power quality is greatly optimized, reducing the regulatory pressure on the power grid. Overall, it extends the service life of more vulnerable equipment, namely wave energy generator sets, thus preventing a sharp drop in total power. It prioritizes meeting local load demand, improves power supply reliability and power quality, and helps maintain a continuous power supply, thereby improving the stability of the power generation system's output power.

[0023] Optionally, the third step of regulation is further updated as follows: If In this case, the tidal power generator's set power will be maintained first, while the wave power generator's set power will be reduced to [a lower value]. If the tidal power generator set still has a surplus after its set power is reduced to 0, then the set power of the tidal power generator set will be further reduced. ;

[0024] like In this case, the set power of the wave generator set will be maintained first, while the set power of the tidal generator set will be reduced to [a certain value]. If the tidal power generator set still has a surplus after its set power is reduced to 0, then the set power of the wave power generator set will be further reduced to [a certain value]. .

[0025] By adopting the technical scheme, when power surplus occurs and energy must be abandoned, the energy with greater contribution to the stability of the entire system is preferentially maintained, the calculated power of the generator set after reduction is prevented from being instructed as a negative value by taking the maximum value constraint, and the stability of the tidal energy power generation which is higher in stability is preferentially reserved by reducing the wave energy first and then reducing the tidal energy if there is still surplus, so that the total output power of the hybrid system can still maintain high stability after reduction, the probability of large fluctuation of the power grid is reduced, the robustness and reliability of the system are enhanced, the local load demand is met, the power supply reliability and power quality are improved, the continuous supply of power is maintained, and the stability of the output power of the power generation system is improved.

[0026] Optionally, the regulating II step is further updated as: calculating the power surplus , and the charging power of the energy storage device is , wherein SOC is the remaining capacity of the energy storage device, E is the total energy capacity of the energy storage device, and At is a time step, if the energy storage device can completely absorb the surplus, the surplus power is stored in the energy storage device preferentially, the surplus is reduced to 0, and the regulation is ended, if the energy storage device cannot completely absorb the surplus, the surplus is updated as , and the regulating III step is executed.

[0027] By adopting the technical scheme, the real-time absorption capacity of the energy storage device is quantitatively managed by calculating the current power surplus, the remaining capacity of the energy storage device, and the maximum acceptable average power corresponding to the remaining capacity in a control period, so that the charging instruction cannot exceed the safe upper limit of the energy storage device in the current state, the overcharging risk is reduced, the service life of the energy storage device is prolonged, the unbalanced power after energy storage is accurately judged by updating the surplus in real time, so as to provide more accurate data for subsequent regulation, the probability of energy waste or device damage caused by inaccurate power estimation is reduced, the impact on the power grid is reduced, the overall utilization rate of energy is improved, the total power is not easy to drop sharply, the local load demand is met, the power supply reliability and power quality are improved, the continuous supply of power is maintained, and the stability of the output power of the power generation system is improved.

[0028] Optionally, in the data acquisition step, the maximum allowed ramping power N of the tidal energy is also acquired, wherein N < X, and the tidal energy power at time t-At of the day is acquired , wherein At is a time step.

[0029] In the calculation step, the calculation model of the tidal energy power at time t is updated as .

[0030] By adopting the above technical solutions, it is possible that the tidal current velocity may change rapidly due to factors such as terrain and strong winds, causing its theoretical power generation capacity to fluctuate. Directly using this power as the setpoint without constraints can easily force the generator to rapidly increase or decrease its power, generating significant mechanical and electrical stress. By adding constraints, the power changes of the tidal generator are forced to be smoother, reducing the probability of grid frequency fluctuations and voltage flicker caused by sudden power increases and decreases, improving power quality, making the output of the hybrid power station more grid-friendly, and making the output power curve smoother and more predictable. This provides a more stable power baseline for the optimized scheduling of the entire system, enhances the system's controllability, reduces grid impact, makes it less likely for the total power to drop sharply, meets local load demand, improves power supply reliability and power quality, and helps maintain a continuous power supply, thereby improving the stability of the power generation system's output power.

[0031] Optionally, the control step I is further updated as follows: If tidal energy and wave energy are sufficient, then set the power of the tidal power generator at time t to be... Let the set power of the wave energy generator at time t be... ;

[0032] If tidal energy is sufficient but wave energy is insufficient, then let ,make Reduce to 0;

[0033] If tidal energy is insufficient but wave energy is sufficient, then... Reduce to 0, ;

[0034] If tidal energy is insufficient and wave energy is insufficient, then let and Reduce to 0.

[0035] By adopting the above technical solution, generator sets operating during off-peak periods have extremely low efficiency. If they are forced to operate at extremely low power levels, auxiliary energy consumption may approach or even exceed power generation, which would reduce the overall conversion efficiency of the system. Therefore, when an energy source is completely insufficient, reducing its output power to zero and putting it on standby for maintenance eliminates unnecessary energy consumption, reduces inefficient energy conversion, simplifies control decisions, and eliminates the need for the system to design a reduction ratio for low-value energy sources. This significantly reduces the computational burden and improves response efficiency. This strategy provides a clear operating environment for another energy source that is in a sufficient state, allowing it to output at full capacity. It simplifies the coupling relationship between systems, makes the operating status easier to monitor and predict, improves the overall energy utilization rate, enhances the system's operating efficiency and economy, improves power supply reliability and power quality, and helps maintain a continuous power supply, thereby improving the stability of the power generation system's output power.

[0036] Optionally, in the regulating step, the tidal power generator is set to a power The specific operations for cutting include, but are not limited to, adjusting the output power of the wave power generator, the wave energy conversion efficiency, the paddle angle, the angle between the wave direction and the device capture direction, the speed setting value, and the grid-connected power setting value, etc. The specific operations for cutting include, but are not limited to, adjusting the output power of the wave power generator, the wave energy conversion efficiency, the paddle angle, the angle between the wave direction and the device capture direction, the speed setting value, and the grid-connected power setting value, etc.

[0037] By adopting the above technical solutions, different tidal or wave power generation technologies, such as horizontal axis turbines, oscillating water columns, point absorbers, etc., have different working principles and controllable variables. The power cutting strategy can be implemented through various specific physical or electrical adjustment methods. Regardless of the specific technical route, power control can be achieved by adjusting parameters, which can make the control strategy be accurately and reliably implemented, and be more easily adapted and integrated with different manufacturers and different models of power generation equipment, thereby improving the universality and economy of the method.

[0038] Optionally, in the monitoring step I, the tidal low period is determined by judging whether the real-time flow rate is continuously lower than a first threshold value V within a specified period, and the wave low period is determined by judging whether the wave height is continuously lower than a second threshold value H within a specified period.

[0039] By adopting the above technical solutions, short-time noise and disturbance in the marine environment are ubiquitous. For example, a sudden surge may cause the instantaneous wave height to temporarily exceed the threshold, but it does not mean that the wave resources are truly abundant. By clearly quantifying the determination criteria for the low period, the accuracy of state identification is significantly improved, the stability of system operation is improved, and the probability of unnecessary start or stop of the power generation unit due to misjudgment is reduced, thereby reducing the mechanical wear of the equipment, prolonging the service life of the equipment, improving the stability of the output power, reducing the impact on the power grid, improving the overall utilization rate of energy, and being conducive to maintaining the continuous supply of electricity, thereby improving the stability of the output power of the power generation system.

[0040] Optionally, it further includes a monitoring step II: the safe wave height of the wave is If it is monitored that , the wave power generator is stopped for maintenance.

[0041] By adopting the technical scheme, the wave energy power generation device is usually exposed to the sea surface or close to the sea surface, and is a relatively fragile part in the hybrid system, and if there is an extreme weather such as a storm, a huge wave is generated, which is easy to cause damage to the device, therefore, once the effective wave height exceeds the safety threshold, standby maintenance instructions are directly executed, for example, the active parts are locked or adjusted to the anti-wave form, and the like, thereby reducing the operation risk of the equipment, and improving the stability and economy of the power generation system.

[0042] Optionally, the method further comprises a monitoring III step and a feedback step;

[0043] The monitoring III step comprises: monitoring the start-stop times g of the wave energy power generation unit in a specified period, and the upper limit of the start-stop times is G, if g<=G, it is judged that the start-stop is normal, otherwise, it is judged that the start-stop is frequent, and the feedback step is executed.

[0044] The feedback step comprises: generating a wave energy power generation unit start-stop frequent early warning signal, and uploading the early warning signal to the management end.

[0045] By adopting the technical scheme, for the wave energy power generation unit, the mechanical fatigue loss caused by frequent start-stop operation may be higher than that caused by continuous stable operation, by increasing the monitoring of the start-stop times in a specified period, the degree of hidden loss can be quantitatively evaluated, when the start-stop times exceed a reasonable threshold, an early warning signal is generated, the operation and maintenance personnel can learn about the equipment operation state in advance, and intervene before the equipment has a substantial fault, thereby realizing predictive maintenance, significantly reducing the operation and maintenance cost and accidental loss of power generation capacity, improving the economy and safety of the power generation system, and thereby improving the stability of the power generation system output power.

[0046] Compared with the prior art, the beneficial effects of the present application are:

[0047] 1. By real-time acquisition of various environmental data and equipment data, the actual power generation capacity of the unit under the current environmental conditions is calculated and constrained within the safety threshold, thereby protecting the power generation unit, prolonging the service life, reducing the probability of low or invalid execution of the control instruction, by monitoring whether the current time is a tidal low period or a wave low period, complementary control of tidal energy and wave energy is performed, and energy storage equipment is dispatched to further balance the power generation capacity, realizing basic energy replacement and complementation, compared with the prior art in which the two are simply connected in parallel and the power generation unit is started and stopped, the variation curve of the total output power is significantly smoothed, the power grid impact is reduced, the overall energy utilization rate is improved, the energy storage system is used as a means to further balance the power grid, the power generation system has a flexible output space, in special environments, when one of the energy sources fails due to being in a low period, the total power is not easy to drop sharply, the local load demand can be preferentially met, the power supply reliability and power quality are improved, which is conducive to maintaining the continuous supply of electricity, thereby improving the stability of the power generation system output power.

[0048] 2. When there is a power surplus, the system first tries to absorb it using energy storage devices, thereby reducing the waste of renewable resources, supplying the future energy shortage of the power generation system, reducing the frequency of the power generation unit operating at a reduced capacity, and making the power generation equipment run for a longer time in its high-efficiency range, thereby improving the efficiency of the system. Compared with directly discarding energy or starting and stopping the unit, it is more economical and environmentally friendly. When the energy storage system cannot completely absorb the surplus, the power of a specific unit is selectively reduced according to the decision of the power size, thereby preferentially protecting the unit with higher conversion efficiency, more stable output, or lower maintenance cost, optimizing the output power quality of the system, reducing the adjustment pressure of the power grid, thereby making the total power less likely to drop sharply, preferentially meeting the local load demand, improving power supply reliability and power quality, and helping to maintain continuous power supply, thereby improving the stability of the output power of the power generation system.

[0049] 3. When there is a power surplus and energy must be discarded, the system preferentially maintains the energy that contributes more to the stability of the entire system. By reducing the energy in steps, for example, all wave energy is reduced first, and if there is still a surplus, tidal energy is reduced, the tidal energy generation with higher stability is preferentially retained, thereby making the total output power of the hybrid system still maintain high stability after reduction, reducing the probability of large fluctuations in the power grid, enhancing the robustness and reliability of the system, meeting the local load demand, and thereby improving the stability of the output power of the power generation system.

[0050] 4. The real-time absorption capacity of the energy storage device is quantitatively managed by calculation, so that the charging instruction does not exceed the safe upper limit of the energy storage device in the current state, reducing the risk of overcharging and prolonging the service life of the energy storage device. By updating the surplus in real time, the power that is not balanced after energy storage can be accurately judged, reducing the probability of energy waste or device damage caused by inaccurate power estimation, reducing the impact on the power grid, improving the overall utilization of energy, making the total power less likely to drop sharply, meeting the local load demand, improving power supply reliability and power quality, and thereby improving the stability of the output power of the power generation system.

[0051] 5. The tidal flow rate may change rapidly due to factors such as terrain and strong winds, causing the theoretical available power to jump, which can force the unit to rapidly increase or decrease power, causing large mechanical and electrical stresses. By adding a constraint, the power change of the tidal power unit is forced to be smooth, reducing the probability of power grid frequency fluctuations and voltage flicker caused by sudden power surges and drops, improving power supply quality, providing a more stable power baseline for the optimal scheduling of the entire system, enhancing the controllability of the system, reducing the impact on the power grid, and helping to maintain continuous power supply, thereby improving the stability of the output power of the power generation system. BRIEF DESCRIPTION OF DRAWINGS

[0052] The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application. It will be appreciated that the drawings are merely schematic and are not intended to represent the actual size or shape of the application, but are intended to conceptually convey the principles of the application. It will be understood by those skilled in the art that various modifications can be made to the implementations described in the specification without departing from the scope of the application. In some instances, certain features, functions, and / or elements of the implementations can be combined and / or divided into separate features, functions, and / or elements. For the sake of brevity, certain implementations will not be described in detail in the interest of avoiding obscuring the application. Other implementations can be understood and effected by those skilled in the art in practicing the claims, based on the following description and the accompanying drawings.

[0053] Figure 1 A flow chart of a method for controlling a wave energy and tidal energy complementary power generation generator set. DETAILED DESCRIPTION

[0054] The technical solutions in the embodiments of the application will be clearly and completely described in the following. Figure 1 The technical solutions in the embodiments of the application will be clearly and completely described in the following.

[0055] The embodiments of the application disclose a method for controlling a wave energy and tidal energy complementary power generation generator set, which refers to Figure 1 , and comprises a data acquisition step S1, a calculation step S2, a monitoring I step S3, a control I step S4, a judgment step S5, a control II step S6, a control III step S7, a monitoring II step S8, a monitoring III step S9, and a feedback step S10.

[0056] S1, the data acquisition step: real-time acquisition of the tidal flow rate at time t is , the wave height of the wave is , the wave period is , the tidal energy generator set safety power X, the wave energy generator set safety power Y, the local power grid load power P, the maximum allowed climbing power N of the tidal energy, wherein N < X, the tidal energy generation power at time t-∆t of the day is acquired , wherein ∆t is a time step.

[0057] S2, the calculation step: calculation of the tidal energy generation power at time t is , wherein ρ is the seawater density, is the tidal energy conversion efficiency, R is the turbine rotor radius, the wave energy generation power is calculated as , wherein is the wave energy conversion efficiency, K is the correction coefficient, and g is the gravity acceleration.

[0058] S3, monitoring step: if monitoring the time t is the tidal low period, it is judged that the tidal energy is insufficient, otherwise, it is judged that the tidal energy is sufficient, if monitoring the time t is the wave low period, it is judged that the wave energy is insufficient, otherwise, it is judged that the wave energy is sufficient, wherein the tidal low period is determined by judging whether the real-time flow rate is less than the first threshold value V for a specified period, and the wave low period is determined by judging whether the wave height is less than the second threshold value H for a specified period.

[0059] S4, regulation I step: if the tidal energy is sufficient and the wave energy is sufficient, the tidal energy generator set power at time t is set to , and the wave energy generator set power at time t is set to .

[0060] If the tidal energy is sufficient and the wave energy is insufficient, the tidal energy generator set power is , and the wave energy generator set power is proportionally reduced to 0.

[0061] If the tidal energy is insufficient and the wave energy is sufficient, the wave energy generator set power is proportionally reduced to 0, and the tidal energy generator set power is .

[0062] If the tidal energy is insufficient and the wave energy is insufficient, the tidal energy generator set power and the wave energy generator set power are proportionally reduced to 0.

[0063] In the regulation I step, the tidal energy generator set power is reduced, and the specific operation includes but is not limited to adjusting the tidal energy generator set output power, the tidal energy conversion efficiency, the water turbine speed, the guide vane angle, the hydraulic system pressure, and the device damping, etc., and the wave energy generator set power is reduced, and the specific operation includes but is not limited to adjusting the wave energy generator set output power, the wave energy conversion efficiency, the paddle angle, the angle between the wave direction and the device capture direction, the speed setting value, and the grid-connected power setting value, etc.

[0064] S5, judgment step: the total power generation power setting value at time t is , if , it is judged that the power generation is balanced or insufficient, and the energy storage device is discharged to the power grid, and the discharge power is , if , it is judged that the power generation is excessive, and the energy storage device absorbs the power surplus, and the regulation II step S6 is executed.

[0065] S6, regulation II step: the power surplus is calculated , and the energy storage device charging power is ​​If the storage device can fully absorb the surplus, the surplus power is stored in the storage device first, and the surplus is reduced to 0, and the regulation ends. If the storage device cannot fully absorb the surplus, the surplus is updated as The regulation III step S7 is executed.

[0066] S7, regulation III step: if , the tidal energy generator set power is reduced to , and if the tidal energy generator set power is reduced to 0 and there is still surplus, the wave energy generator set power is continuously reduced to .

[0067] If , the wave energy generator set power is reduced to , and if the tidal energy generator set power is reduced to 0 and there is still surplus, the wave energy generator set power is continuously reduced to .

[0068] S8, monitoring II step: the safe wave height of the wave is If the monitoring is , the wave energy generator set is stopped for maintenance.

[0069] S9, monitoring III step: the start-stop number g of the wave energy generator set in a specified period is monitored, and the upper limit of the start-stop number is G. If g≤G, it is judged that the start-stop is normal, otherwise, it is judged that the start-stop is frequent, and the feedback step S10 is executed.

[0070] S10, feedback step: a wave energy generator set start-stop frequent warning signal is generated, and the warning signal is uploaded to the management end.

[0071] The implementation principle of the power management method of the wave energy and tidal energy complementary power generation generator set in the embodiment is:

[0072] Real-time acquisition of various environmental data and equipment data, calculation of tidal energy power generation and wave energy power generation under current environmental conditions, and constraint of the power generation within a safe threshold, so as to protect the generator set, prevent it from overloading, prolong its service life, provide reliable data for subsequent power distribution, and reduce the probability of low or invalid execution of regulation instructions.

[0073] Because the tidal flow rate can change rapidly due to factors such as topography, strong wind, etc., causing the theoretical power generation to jump, directly taking this power as a set value without constraints can easily force the unit to rapidly increase and decrease power, generating large mechanical and electrical stresses. By adding constraints, the power change of the tidal power unit is forced to be smooth, reducing the probability of grid frequency fluctuations and voltage flicker caused by sudden power surges and drops, making the output of the hybrid power station more friendly to the grid, making the output power curve smoother and more predictable, providing a more stable power baseline for the optimization of the entire system, enhancing the controllability of the system, and reducing the impact on the grid.

[0074] By monitoring whether the current time is a tidal low period or a wave low period, complementary regulation of tidal and wave energy is performed, and energy storage devices are dispatched to further balance power generation, achieving basic energy replacement and complementarity. By clearly quantifying the determination criteria for the low period, the accuracy of state identification is improved, the stability of system operation is improved, and the probability of unnecessary start-up or shutdown of the generator due to misjudgment is reduced, thereby reducing mechanical wear and tear of the equipment, prolonging the service life of the equipment, improving the stability of the output power, and being beneficial to maintaining continuous power supply.

[0075] By clearly quantifying the determination criteria for the low period, the accuracy of state identification is significantly improved, the stability of system operation is improved, and the probability of unnecessary start-up or shutdown of the generator due to misjudgment is reduced, thereby reducing mechanical wear and tear of the equipment, prolonging the service life of the equipment, improving the stability of the output power, reducing the impact on the grid, improving the overall utilization of energy, and being beneficial to maintaining continuous power supply, thereby improving the stability of the output power of the power generation system.

[0076] The generator in the low period has very low efficiency, and if it is forced to operate at a very low power level, the auxiliary energy consumption may be close to or even exceed the power generation, which will actually reduce the overall conversion efficiency of the system. Therefore, when one energy source is completely insufficient, the output power is reduced to 0, and the standby maintenance is eliminated, the unnecessary energy consumption is reduced, the inefficient conversion of energy is reduced, the control decision is simplified, and the system does not need to design a reduction ratio for low-value energy, greatly reducing the computational burden and improving the response efficiency.

[0077] This strategy provides a clear operating environment for another energy source in sufficient state, allowing it to output at full capacity, simplifying the coupling relationship between systems, making the operating state easier to monitor and predict, improving the overall utilization of energy, improving the operating efficiency and economy of the system, improving power supply reliability and power quality, and being beneficial to maintaining continuous power supply, thereby improving the stability of the output power of the power generation system.

[0078] Different tidal energy or wave energy power generation technologies, such as horizontal axis turbines, oscillating water columns, point absorbers, etc., have different working principles and controllable variables. The power reduction strategy can be implemented through various specific physical or electrical adjustment methods. Regardless of the specific technical route, the adjustment parameters can be used to accurately and reliably implement the control strategy, making it easier to adapt and integrate different manufacturers and models of power generation equipment, thereby improving the universality and economy of the method.

[0079] Compared with the simple parallel connection of the two in the prior art and the start-stop control of the generator set, the method significantly smooths the total output power curve, reduces the grid impact, and improves the overall utilization of energy. The energy storage system is used as a means to further balance the grid, making the power generation system have a flexible output space. In special circumstances, when one of the energy sources fails due to being in a trough period, the total power is less likely to drop sharply, and the local load demand can be prioritized, improving power supply reliability and power quality, which is conducive to maintaining continuous power supply, thereby improving the stability of the output power of the power generation system.

[0080] When there is a power surplus, the energy storage device is preferentially used to absorb it, thereby reducing the waste of renewable resources, transferring energy to supply future energy shortages in the power generation system, maximizing the utilization of renewable energy, improving the economic benefits of the power station, and minimizing the frequency of power reduction operations on the generator set, allowing the power generation equipment to operate in its high-efficiency range for a longer period of time, improving the efficiency of the system, and being more economical and environmentally friendly compared to directly abandoning energy or starting and stopping the generator set.

[0081] When the energy storage system cannot completely absorb the surplus, the power of a specific generator set is selectively reduced according to the decision based on the power size of the two, thereby prioritizing the protection of generator sets with higher conversion efficiency, more stable output, or lower maintenance cost.

[0082] For example, if the decision is to "preferentially maintain tidal power and reduce wave power", the effect is to use the greater regularity and higher prediction accuracy of tidal energy to provide a more stable and reliable power baseline for the grid. Tidal turbines operate smoothly and have high efficiency, and excessive speed reduction can cause additional damage to their bearings and other components. Wave energy devices themselves have large fluctuations, and their energy conversion devices such as hydraulic systems are more easily adjusted.

[0083] Using wave energy, which is more random and volatile, as an adjustable marginal power source greatly optimizes the output power quality of the system, reduces the adjustment pressure of the grid, and prolongs the service life of the more fragile equipment, i.e., the wave energy generator set, thereby making the total power less likely to drop sharply, improving power supply reliability and power quality, and being conducive to maintaining continuous power supply.

[0084] When power surplus occurs and energy must be abandoned, the energy that contributes more to the stability of the entire system is preferentially maintained, the calculated power of the generator set after reduction is not instructed to be a negative value by taking the maximum value constraint, and the energy is reduced by a step-by-step reduction strategy.

[0085] For example, all wave energy is reduced first, and if there is still surplus, tidal energy is reduced, so that the tidal energy generation with higher stability is preferentially retained, so that the total output power of the hybrid system can still maintain high stability after reduction, reducing the probability of large fluctuations in the power grid, enhancing the robustness and reliability of the system, meeting the local load demand, improving power supply reliability and power quality, and helping to maintain continuous power supply, thereby improving the stability of the output power of the power generation system.

[0086] By calculating the current power surplus, the remaining capacity of the energy storage device, and the maximum acceptable average power corresponding to the remaining capacity in a control period, the real-time absorption capacity of the energy storage device is quantitatively managed, so that the charging instruction does not exceed the safe upper limit of the energy storage device in the current state, reducing the risk of overcharging and prolonging the service life of the energy storage device.

[0087] By updating the surplus in real time, the unbalanced power after energy storage can be accurately judged, thereby providing more accurate data for subsequent regulation and control, reducing the probability of energy waste or device damage due to inaccurate power estimation, reducing the impact on the power grid, improving the overall utilization of energy, and making the total power less likely to drop sharply, meeting the local load demand, improving power supply reliability and power quality, and helping to maintain continuous power supply, thereby improving the stability of the output power of the power generation system.

[0088] Wave energy generation devices are usually exposed to the surface of the sea or near the sea, and are the more fragile part of the hybrid system. If there is extreme weather such as a storm, the huge waves generated can easily damage the device. Therefore, once the effective wave height exceeds the safety threshold, standby maintenance instructions are executed, such as locking or adjusting the active parts to a wave-resistant form, reducing the risk of device operation and improving the stability and economy of the power generation system.

[0089] For wave energy generators, the mechanical fatigue loss caused by frequent start-stop operations may be higher than that of continuous stable operation. By increasing the monitoring of the number of starts and stops within a specified period, the degree of hidden loss can be quantitatively evaluated. When the number of starts and stops exceeds a reasonable threshold, a warning signal is generated, and the operating personnel can learn about the device operating state in advance to intervene before the device fails substantially, achieving predictive maintenance, significantly reducing operating costs and accidental losses of power generation, and improving the economy and safety of the power generation system.

[0090] The above are preferred embodiments of the present application, and do not limit the protection scope of the present application, so: any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A method for managing and controlling a power generator set based on wave energy and tidal energy, characterized in that, Comprising the following steps: Acquisition data: the flow rate of the tide at time t is , the wave height of the wave is , the wave period is , the safe power X of the tidal power generating set, the safe power Y of the wave power generating set, and the load power P of the local power grid; The tidal energy power generation capability at time t is calculated wherein p is the density of seawater, is the tidal energy conversion efficiency, R is the radius of the turbine rotor, and the wave energy power generation capability is calculated wherein, is the wave energy conversion efficiency, K is a correction coefficient, and g is the acceleration of gravity; Monitoring I: if it is monitored that the time t is a tidal low period, it is judged that tidal energy is insufficient, otherwise, it is judged that tidal energy is sufficient, if it is monitored that the time t is a wave low period, it is judged that wave energy is insufficient, otherwise, it is judged that wave energy is sufficient, wherein the tidal low period is determined by judging whether the real-time flow velocity is continuously lower than a first threshold value V within a specified period, and the wave low period is determined by judging whether the wave height is continuously lower than a second threshold value H within a specified period. Regulation I: if tidal energy is sufficient, wave energy is sufficient, then set the tidal energy generator set power at time t as , and set the wave energy generator set power at time t as ; If the tidal energy is sufficient and the wave energy is insufficient, the tidal energy is used to drive the turbine to generate electricity , the tidal energy is used to drive the turbine to generate electricity is proportionally reduced; If the tidal energy is insufficient, the wave energy is sufficient, then let Proportionally reduce, let ; If the tidal energy is insufficient, the wave energy is insufficient, then let and Proportionally reduce; Determination: the total power generation set value at time t is , if , it is determined that the power generation is balanced or insufficient, the energy storage device is discharged to the power grid, and the discharge power is , if , it is determined that the power generation is excessive, and the energy storage device absorbs the power surplus; Monitoring step II: the safe wave height of the wave is If monitoring , the wave energy generator set is stopped for maintenance. Monitoring III: monitoring the start-stop times g of the wave energy generator set within a specified period, the upper limit of the start-stop times being G, if g≤G, it is judged that the start-stop is normal, otherwise, it is judged that the start-stop is frequent, and the feedback step is executed; Feedback: generating a wave energy generator set start-stop frequent early warning signal, and uploading the early warning signal to the management end.

2. The method according to claim 1, wherein: Further comprising a regulating II step and a regulating III step, in the judging step, when it is judged that the power generation is excessive, the regulating II step is executed; Regulation II: Calculate power surplus If the energy storage device can completely absorb the surplus, the surplus power is stored in the energy storage device first, and the surplus is reduced to 0, and the regulation ends. If the energy storage device cannot completely absorb the surplus, the surplus after absorption is updated, and the regulation III step is executed. Regulation III: If , the tidal power generator set power is preferentially maintained, and the wave power generator set power is reduced, and if , the wave power generator set power is preferentially maintained, and the tidal power generator set power is reduced.

3. The method according to claim 2, wherein: The regulation III step is further updated as: if , the tidal power generator set power is kept preferentially, and the wave power generator set power is reduced to , if the wave power generator set power is reduced to 0 and there is still surplus, the tidal power generator set power is continuously reduced to ; If , the wave energy generator set power is reduced to , and if the tidal energy generator set power is reduced to 0, the wave energy generator set power is further reduced to .

4. The method of claim 2, wherein the method further comprises: determining the amount of wave energy and tidal energy; and determining the amount of wave energy and tidal energy to be used for the power generation. The regulation II step is further updated as: calculating the power surplus , the energy storage device charging power is , wherein SOC is the remaining power of the energy storage device, E is the total energy capacity of the energy storage device, and ∆t is a time step. If the energy storage device can completely absorb the surplus, the surplus power is stored in the energy storage device first, the surplus is reduced to 0, and the regulation is ended. If the energy storage device cannot completely absorb the surplus, the surplus is updated as , and the regulation III step is executed.

5. The method of claim 1, wherein: In the data acquisition step, the maximum allowed climbing power N of tidal energy is also acquired, where N < X, and the power of tidal energy generation at time t-∆t of the day is acquired where ∆t is a time step. In the calculation step, the calculation model of the tidal energy power generation capacity at time t is updated as: .

6. The method of claim 1, wherein: The regulation I step is further updated as: if the tidal energy is sufficient and the wave energy is sufficient, the tidal energy generator set power at time t is set as , and the wave energy generator set power at time t is set as . If tidal energy is sufficient, wave energy is insufficient, then let , let be reduced to 0; If tidal energy is insufficient, wave energy is sufficient, then make cut to 0, make ; If tidal energy is insufficient, wave energy is insufficient, then let and be reduced to 0. 7.The method of claim 1, wherein the method further comprises: determining whether the wave energy and tidal energy are available; and if the wave energy and tidal energy are available, operating the wave energy and tidal energy generator to generate electricity. Regulating the tidal power generator set power The specific operations of the reduction include adjusting the tidal power generator output power, tidal energy conversion efficiency, water turbine speed, guide vane angle, hydraulic system pressure and device damping, and setting the wave power generator power The specific operations of the reduction include adjusting the wave power generator output power, wave energy conversion efficiency, paddle angle, angle between wave direction and device capture direction, speed setting value and grid-connected power setting value.

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