Wave force power generation device grid-connected operation control method and system

Abstract

The invention relates to the technical field of new energy power generation, and discloses a grid-connected operation control method and system for a wave power generation device, and the method comprises the steps: carrying out the power regulation and control of a power generation unit in a target device, and carrying out the charging and discharging regulation and control of a battery energy storage system, so as to enable the predicted power generation amount of the target device to meet the power demands of station equipment; the direct-current bus voltage is kept stable, a certain electric quantity of the battery can be maintained, smooth grid-connected power is realized, a stable and continuous power supply target is provided for a power grid, and the technical problem of how to improve the grid-connected operation stability of the wave power generation device is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of renewable energy power generation, and in particular to a method and system for controlling grid-connected operation of a wave power generation device. Background Art

[0002] Wave energy is a renewable energy source with huge reserves and has not yet been fully developed. It has the advantages of high energy density and strong energy storage capacity. With the increasing attention paid to marine resources, the development prospects of wave energy are very broad, and wave energy power generation technology will also usher in greater development space.

[0003] Although the wave power generation device is connected to the power grid, the device platform often floats independently on the sea. Due to the complex natural conditions of the ocean and the changeable weather, people are restricted by wind and wave conditions and cannot log on to the device platform frequently. Therefore, the wave power generation device should have the ability to automatically control power generation after being connected to the grid. The wave power generation device is different from the wind power generation platform. There are many electrical equipment on the device, which needs to be continuously operated automatically during the grid-connected operation. The wave power generation device is required to automatically control and dispatch according to the power load, wave energy generation power, photovoltaic power, battery energy storage system power, etc., through the grid-connected control strategy to achieve the goal of long-term stable operation of the wave power generation device, continuous and stable power generation, and stable power transmission to the grid.

[0004] At present, it is extremely rare for large-power wave power generation devices to be connected to the grid, while small-power wave power generation devices usually have little impact on the power grid. In the past, the grid-connected strategy of wave power generation devices was relatively extensive, that is, the power generated by wave power generation and photovoltaic power generation was directly transmitted to the power grid. This resulted in large power fluctuations and lack of controllability. Under this mode, there are many uncontrollable factors, such as the inability to artificially adjust the output power of the wave power generation device, making it difficult to supply stable and continuous power to the power grid. Summary of the invention

[0005] The present invention provides a method and system for controlling the grid-connected operation of a wave power generation device, which solves the technical problem of how to improve the grid-connected operation stability of the wave power generation device.

[0006] A first aspect of the present invention provides a method for controlling grid-connected operation of a wave power generation device, comprising:

[0007] In response to a grid-connected operation control request for a target device, determine an operation state of the target device;

[0008] When the operating state of the target device is a normal operating state, obtaining the estimated power generation of the target device;

[0009] comparing the predicted power generation with the preset dispatched power generation;

[0010] If the estimated power generation is greater than or equal to the preset scheduled power generation, charging the target device is regulated according to the charging period of the energy storage battery in the target device;

[0011] If the predicted power generation is less than the preset scheduled power generation, the target device is discharged and regulated according to the discharge period of the energy storage battery in the target device.

[0012] Optionally, if the expected power generation is greater than or equal to the preset scheduled power generation, charging control of the target device is performed according to the charging period of the energy storage battery in the target device, including:

[0013] If the estimated power generation is greater than or equal to the preset scheduled power generation, determining whether the energy storage battery in the target device is in a charging period;

[0014] When the energy storage battery in the target device is in a charging period, the target device is regulated according to a preset first charging strategy;

[0015] When the energy storage battery in the target device is not in the charging period, the target device is regulated according to a preset second charging strategy.

[0016] Optionally, when the energy storage battery in the target device is in a charging period, regulating the target device according to a preset first charging strategy includes:

[0017] When the energy storage battery in the target device is in the charging period, the estimated power generation and the preset scheduled power generation are used to perform a difference calculation to obtain the surplus power generation;

[0018] comparing the surplus power generation with the charging capacity of the energy storage battery;

[0019] If the surplus power generation is less than or equal to the charging power, controlling the energy storage battery to perform a charging operation;

[0020] If the surplus power generation is greater than the charging power, the energy storage battery is controlled to perform a charging operation and the power generation unit in the target device is controlled to perform a power reduction operation until the surplus power generation is less than or equal to the charging power.

[0021] Optionally, when the energy storage battery in the target device is not in a charging period, regulating the target device according to a preset second charging strategy includes:

[0022] When the energy storage battery in the target device is not in the charging period, the estimated power generation and the preset scheduled power generation are used to perform a difference calculation to obtain the surplus power generation;

[0023] Determining whether the surplus power generation is a preset first power generation threshold;

[0024] If the surplus power generation is the preset first power generation threshold, maintaining the target device in the current operating state;

[0025] If the surplus power generation is not the preset first power generation threshold, the energy storage battery is controlled to perform a charging operation and the power generation unit in the target device is controlled to perform a power reduction operation until the surplus power generation reaches the preset first power generation threshold.

[0026] Optionally, if the expected power generation is less than the preset scheduled power generation, the target device is regulated to discharge according to the discharge period of the energy storage battery in the target device, including:

[0027] If the estimated power generation is less than the preset scheduled power generation, determining whether the energy storage battery in the target device is in a discharge period;

[0028] When the energy storage battery in the target device is in a discharge period, the target device is regulated according to a preset first discharge strategy;

[0029] When the energy storage battery in the target device is not in the discharge period, the target device is regulated according to a preset second discharge strategy.

[0030] Optionally, when the energy storage battery in the target device is in a discharge period, regulating the target device according to a preset first discharge strategy includes:

[0031] When the energy storage battery in the target device is in the discharge period, the estimated power generation and the preset scheduled power generation are used to perform a difference calculation to obtain the shortfall power generation;

[0032] Comparing the shortfall power generation with the discharge power of the energy storage battery;

[0033] If the deficit power generation is less than or equal to the discharge power, controlling the energy storage battery to perform a discharge operation;

[0034] If the power generation deficit is greater than the discharge power, the energy storage battery is controlled to perform a discharge operation and the power generation unit in the target device is controlled to perform a power boost operation until the power generation deficit is less than or equal to the discharge power.

[0035] Optionally, when the energy storage battery in the target device is not in a discharge period, regulating the target device according to a preset second discharge strategy includes:

[0036] When the energy storage battery in the target device is not in the discharge period, the estimated power generation and the preset scheduled power generation are used to perform a difference calculation to obtain the shortfall power generation;

[0037] Determining whether the shortfall power generation is a preset second power generation threshold;

[0038] If the shortfall power generation is the preset second power generation threshold, maintaining the target device in the current operating state and continuing to operate;

[0039] If the power generation deficit is not the preset second power generation threshold, the energy storage battery is controlled to perform a discharge operation and the power generation unit in the target device is controlled to perform a power boost operation until the power generation deficit reaches the preset second power generation threshold.

[0040] A second aspect of the present invention provides a wave power generation device grid-connected operation control system, comprising:

[0041] A response module, used to respond to a grid-connected operation control request for a target device and determine an operation state of the target device;

[0042] A power generation acquisition module, used for acquiring the estimated power generation of the target device when the operating state of the target device is a normal operating state;

[0043] A comparison module, used for comparing the predicted power generation with the preset dispatched power generation;

[0044] A first control module, configured to control charging of the target device according to a charging period of an energy storage battery in the target device if the expected power generation is greater than or equal to the preset scheduled power generation;

[0045] The second control module is used to control the discharge of the target device according to the discharge period of the energy storage battery in the target device if the expected power generation is less than the preset scheduled power generation.

[0046] A third aspect of the present invention provides an electronic device, comprising a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor executes the steps of the grid-connected operation control method of a wave power generation device as described in any one of the above.

[0047] A fourth aspect of the present invention provides a computer-readable storage medium having a computer program stored thereon, wherein when the computer program is executed, the method for controlling grid-connected operation of a wave power generation device as described in any one of the above items is implemented.

[0048] It can be seen from the above technical solutions that the present invention has the following advantages:

[0049] In the present invention, a grid-connected operation control request for a target device is responded to, the operation state of the target device is determined, when the operation state of the target device is a normal operation state, the expected power generation of the target device is obtained, the expected power generation and the preset scheduled power generation are compared, if the expected power generation is greater than or equal to the preset scheduled power generation, the target device is charged and regulated according to the charging period of the energy storage battery in the target device, if the expected power generation is less than the preset scheduled power generation, the target device is discharged and regulated according to the discharge period of the energy storage battery in the target device; the present invention performs power regulation on the power generation unit in the target device and charge and discharge regulation on the battery energy storage system, so that the expected power generation of the target device meets the power demand of the station equipment, maintains the stability of the DC bus voltage, and maintains a certain amount of power in the battery, so as to achieve smooth grid-connected power, provide a stable and continuous power supply target for the power grid, and solves the technical problem of how to improve the grid-connected operation stability of the wave power generation device. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0051] Figure 1 A flowchart of the steps of a method for controlling grid-connected operation of a wave power generation device provided in the first embodiment of the present invention;

[0052] Figure 2 A flow chart of the steps of a method for controlling grid-connected operation of a wave power generation device provided in the second embodiment of the present invention;

[0053] Figure 3 is a schematic diagram of the structure of a wave power generation device;

[0054] Figure 4 A flow chart for the grid-connected operation control of the target device;

[0055] Figure 5 This is an example of the SOC change curve of the energy storage system;

[0056] Figure 6 A structural block diagram of a grid-connected operation control system for a wave power generation device provided in Embodiment 3 of the present invention;

[0057] Figure 7 This is a structural block diagram of a computer device provided in Embodiment 4 of the present invention. DETAILED DESCRIPTION

[0058] The embodiment of the present invention provides a method and system for controlling the grid-connected operation of a wave power generation device, which are used to solve the technical problem of how to improve the grid-connected operation stability of a wave power generation device.

[0059] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0060] In view of the large fluctuation of power generation of large wave power generation devices, in order to provide a stable and continuous power supply to the power grid, improve system safety, and realize unattended operation, the present invention proposes a wave power generation device, and proposes a grid-connected operation control method according to the characteristics of the wave power generation device. By analyzing the power load of the current device, the power generation power of the generator set, the power generation power of the photovoltaic system, and the power of the energy storage system, the input and output of the wave power generator set and the photovoltaic unit are automatically controlled in real time, and the charging and discharging and charging and discharging power of the battery energy storage system are controlled, so as to meet the power demand of the equipment used in the wave power generation device station and maintain the stability of the DC bus voltage; and maintain a certain amount of power in the battery, so as to achieve the goal of smoothing the grid-connected power and providing a stable and continuous power supply to the power grid.

[0061] See also Figure 1 , Figure 1 A flowchart of the steps of a method for controlling grid-connected operation of a wave power generation device provided in Embodiment 1 of the present invention.

[0062] The present invention provides a method for controlling grid-connected operation of a wave power generation device, comprising:

[0063] Step 101: respond to a grid-connected operation control request for a target device and determine the operation status of the target device.

[0064] The target device refers to the wave power generation device;

[0065] Grid-connected operation refers to the effective connection of wave power generation devices with the large power grid to achieve stable grid-connected operation. Through submarine cable transmission, wave power generation devices can continuously transmit clean energy to the power grid, optimize the energy structure of the power grid and improve the utilization rate of renewable energy.

[0066] Grid-connected operation control refers to the grid-connected operation mode of the wave power generation device, which mainly ensures the power supply of the station while stabilizing the output power of the power grid, allowing the device to use new energy to the maximum extent within the dispatching index power, and at the same time making the energy storage battery cyclically charge and discharge to increase the battery life.

[0067] The grid-connected operation control request refers to a request instruction for regulating the target device in the grid-connected operation mode, so that the target device after regulation can achieve the goal of smooth and stable grid-connected output power, maintain sufficient power in the energy storage battery, and provide stable power supply according to the dispatch instruction.

[0068] The operating status refers to whether the target device is in a normal grid-connected operating state, that is, whether each unit in the target device is in a normal operating state, and then determines whether the grid-connected power generation state of the entire target device is normal.

[0069] In an embodiment of the present invention, in response to receiving a request instruction for regulating a target device in a grid-connected operation mode, the request instruction is read to obtain a grid-connected operation state of the target device.

[0070] Step 102: When the operating state of the target device is a normal operating state, the estimated power generation of the target device is obtained.

[0071] The estimated power generation refers to the maximum grid-connected power calculated based on the current power data of the target device, and then the estimated power generation that the target device can generate when connected to the grid.

[0072] In the embodiment of the present invention, when the operating state of the target device is a normal operating state, the estimated power generation of the target device is obtained.

[0073] Step 103: Compare the predicted power generation with the preset dispatched power generation.

[0074] The preset dispatched power generation refers to the dispatcher comprehensively calculating the supply and demand distribution of the power grid according to a certain strategy, and issuing it to the wave power generation device in the form of an instruction, requiring the wave power generation device to supply power within a certain output power range. It can be understood as requiring the power generation generated by the target device to meet the target amount.

[0075] In the embodiment of the present invention, the predicted power generation is compared with the preset dispatched power generation.

[0076] Step 104: If the expected power generation is greater than or equal to the preset scheduled power generation, the target device is charged and regulated according to the charging period of the energy storage battery in the target device.

[0077] In an embodiment of the present invention, if the expected power generation is greater than or equal to the preset scheduled power generation, it means that the target device has sufficient power and there is surplus power generation. Therefore, according to the charging period of the energy storage battery in the target device, the charging of the target device is regulated and the surplus power generation is transmitted to the large power grid to maintain the operating stability of the target device.

[0078] Step 105: If the estimated power generation is less than the preset scheduled power generation, the target device is regulated to discharge according to the discharge period of the energy storage battery in the target device.

[0079] In an embodiment of the present invention, if the expected power generation is less than the preset scheduled power generation, it means that the target device is short of electric energy and there is a shortage of power generation. Therefore, according to the discharge period of the energy storage battery in the target device, the discharge of the target device is regulated, and the electric energy of the large power grid is reversely transmitted to the target device to maintain the operating stability of the target device.

[0080] In the present invention, a grid-connected operation control request for a target device is responded to, the operation state of the target device is determined, when the operation state of the target device is a normal operation state, the expected power generation of the target device is obtained, the expected power generation and the preset scheduled power generation are compared, if the expected power generation is greater than or equal to the preset scheduled power generation, the target device is charged and regulated according to the charging period of the energy storage battery in the target device, if the expected power generation is less than the preset scheduled power generation, the target device is discharged and regulated according to the discharge period of the energy storage battery in the target device; the present invention performs power regulation on the power generation unit in the target device and charge and discharge regulation on the battery energy storage system, so that the expected power generation of the target device meets the power demand of the station equipment, maintains the stability of the DC bus voltage, and maintains a certain amount of power in the battery, so as to achieve smooth grid-connected power, provide a stable and continuous power supply target for the power grid, and solves the technical problem of how to improve the grid-connected operation stability of the wave power generation device.

[0081] See also Figure 2 , Figure 2 A flowchart of the steps of a method for controlling grid-connected operation of a wave power generation device provided in the second embodiment of the present invention.

[0082] See also Figure 3 , Figure 3 is a schematic diagram of the structure of a wave power generation device;

[0083] The wave power generation device comprises a wave energy generator unit, a photovoltaic unit, a station power supply unit, an energy storage system and a grid-connected unit, and the wave energy generator unit, the photovoltaic unit, the station power supply unit, the energy storage system and the grid-connected unit are all connected to a DC bus;

[0084] It should be noted that the grid-connected operation control of the wave power generation device is mainly realized through a hierarchical control system composed of controllers. The main controller is the top-level control of the control system, and exchanges information and controls with sub-controllers such as the station power unit controller, grid-connected unit controller, wave power generator unit controller, photovoltaic unit controller, and energy storage system controller through switches.

[0085] The main controller is mainly responsible for power coordination and control between the units, and realizes advanced functions such as data integration, comprehensive calculation and judgment, operation mode management, system protection, power allocation, parameter command issuance, etc.

[0086] The unit controller mainly coordinates and controls the equipment of the unit and collects the operating status data of each unit. The unit controller can control the equipment according to the control instructions of the main controller and the current unit equipment status, and execute interlocking protection to protect the equipment.

[0087] It should be noted that the wave energy generator set and photovoltaic unit are power generation units, specifically power sources, which are used to generate electrical energy and provide new energy input. The station power supply unit is a load that consumes electrical energy. The energy storage system can be used as a power source or a load depending on the application situation. The grid-connected unit is responsible for transmitting the surplus electrical energy from the wave power generation device to the large power grid.

[0088] The wave energy generator unit consists of n hydraulic generator sets. The hydraulic generator power generation is automatically controlled by the unit controller according to the accumulator pressure. At the same time, the hydraulic power generation unit controller can control the rectification power generation or energy consumption of each generator set by controlling the conversion switch. In the energy consumption state, the power generated by the hydraulic generator is directly consumed on the spot through the energy consumption resistor and does not enter the device. In the rectification power generation state, the power generated by the hydraulic generator is collected to the DC bus through the inverter and enters the device.

[0089] Photovoltaic power generation unit, photovoltaic power generation unit controller always generates electricity with MPPT strategy, the controller needs to send start and stop instructions to the photovoltaic controller to control whether each photovoltaic unit generates electricity and enters the system. The power generation is controlled by the photovoltaic controller and the light intensity; among them, the MPPT strategy refers to making the photovoltaic cell always work near the maximum power point to improve the power generation efficiency of the photovoltaic power generation system.

[0090] The station power supply unit and the station power supply unit controller control its start and stop by sending start and stop instructions. After the off-grid inverter is started, it automatically supplies power to the station. The inverter power supply works in the voltage-frequency mode, controls the output voltage and frequency, and provides a stable 400V / 50Hz power supply.

[0091] For the energy storage battery unit, the energy storage battery unit controller controls its output voltage and current, and controls the battery to perform periodic charge and discharge cycles according to the charge and discharge parameters.

[0092] For the grid-connected unit, the grid-connected unit controller controls its inverter to work in AFE mode, stabilizing the DC bus voltage while transmitting the surplus electric energy of the device to the large power grid. Among them, AFE mode is an inverter working mode, namely active front-end rectification. During normal operation, the input is AC voltage and the output is DC voltage. The AFE rectifier provides DC power for the subsequent inverter, and energy can flow in both directions, from the grid to the DC bus, or from the DC bus into the grid.

[0093] Specifically, the main power sources of the wave power generation device are n groups of hydraulic power generation units and x groups of photovoltaic power generation units, the main loads are station power supply units and grid-connected units, and the system operation also requires m groups of energy storage system units;

[0094] The wave energy generator set consists of a permanent magnet synchronous generator, an uncontrolled rectifier hydraulic generator set, and an energy-dissipating resistor for protection. The permanent magnet synchronous generator rotates synchronously under the drive of the hydraulic motor, thereby converting mechanical energy into electrical energy, and converting the irregularly fluctuating alternating current output by the generator into stable and regular direct current through the uncontrolled rectifier, and collecting it on the DC bus. The energy-dissipating resistor is a permanent magnet synchronous generator protection element. When the rectifier is not connected or the rectifier fails and needs to be removed, in order to prevent the permanent magnet synchronous generator from idling and burning the generator, the energy-dissipating resistor needs to be connected to provide an energy unloading channel for the generator to protect the motor. That is, the generator set either works in an energy-dissipating state, consuming the generated power through the energy-dissipating resistor; or works in a rectifying state, transmitting the generated power to the DC bus.

[0095] The photovoltaic unit is composed of photovoltaic panels, junction boxes, photovoltaic controllers, and electrical components such as disconnectors and fuses. There are x groups of photovoltaic units, each of which is connected to the DC bus through its own photovoltaic controller. The photovoltaic panels absorb solar energy and convert it into electrical energy, which is then combined through the photovoltaic junction box and sent to the photovoltaic controller. After isolation and boosting by the photovoltaic controller, it is connected to the DC bus.

[0096] The station power supply unit consists of the platform's local station power supply system, station inverter, disconnector, fuse and other electrical components. The station inverter takes power from the DC busbar, converts it into industrial frequency AC, and then supplies it to the AC grid on the platform after passing through the filter and isolation transformer. The station load size changes with the power of the electrical equipment on the platform, such as pumps, air conditioners, lighting and other equipment.

[0097] The grid-connected unit consists of submarine cables, booster platforms, grid-connected inverters, disconnectors, fuses and other electrical components. The grid-connected inverter takes power from the DC busbar, converts it into industrial frequency AC, and then transmits it to the large power grid through the submarine cable after passing through filters and booster transformers. The power transmitted by the grid is controlled in real time by the power index instructions issued by the dispatcher.

[0098] The energy storage system consists of a battery pack, a high-voltage box, a domain management box, a main switch, a pre-charging circuit, a fuse and other electrical components. The batteries are divided into multiple clusters, each of which contains several battery packs and a high-voltage box. Several battery packs are connected in series to the high-voltage box. There are m groups of energy storage batteries, which are connected to the DC bus through their own DC / DC converters. When the system needs electricity or the DC bus voltage is low, the energy storage system supports the DC bus voltage by discharging; when the battery power is low and needs to be charged or the voltage on the DC bus is high, the energy storage system absorbs excess power on the DC bus by charging.

[0099] In the grid-connected operation mode, the grid-connected unit, energy storage system unit, and station power supply unit work fixedly, and the photovoltaic power generation unit and wave energy generator unit work on demand. The working modes of each unit are as follows:

[0100] (1) The grid-connected unit mainly completes the task of AC-DC conversion. The inverter of the grid-connected unit works in AFE mode, stabilizes the DC bus voltage in a reasonable range, and provides a stable DC bus voltage to the wave power generation device. At the same time, if there is surplus power on the wave power generation device, the grid-connected unit will continuously transmit the surplus power of the device to the large power grid. If the device is short of power, the grid-connected unit can also reversely transmit the power of the grid to the wave power generation device.

[0101] (2) The energy storage system acts as a balancing node for the DC bus voltage. The energy storage system works in voltage control mode to stabilize the DC bus voltage and keep the DC bus voltage stable within a reasonable range. At the same time, it controls the periodic charge and discharge cycle of the energy storage battery to increase the battery life. If the power of the wave power generation device is lower than the load power, the energy storage system is controlled to discharge the battery, increase the bus voltage, and maintain the bus voltage within a reasonable range; if the power of the wave power generation device is higher than the load power, the energy storage system is controlled to absorb the surplus power to charge the battery, reduce the bus voltage, and maintain the bus voltage within a reasonable range; if the surplus power of the wave power generation device exceeds the power that the energy storage system can absorb within the range of the dispatching index power, the DC bus voltage will rise, and the output power of new energy will be limited one by one until the bus voltage stabilizes within a reasonable range. At the same time, the energy storage system can also provide stable voltage support when a system failure occurs.

[0102] (3) The photovoltaic controller uses the MPPT algorithm to output power, and the start and stop of the photovoltaic controller are controlled by the controller command; the photovoltaic cut-off voltage is set. When the DC bus voltage is higher than the set cut-off voltage, the photovoltaic power is automatically reduced to 0;

[0103] (4) The generator set starts and stops according to the controller's instructions, and the controller controls the generator set according to the accumulator pressure. When the accumulator pressure exceeds the start value, the hydraulic valve is started and the generator starts to generate electricity; when the accumulator pressure is lower than the stop value, the hydraulic valve is stopped and the generator stops generating electricity. At the same time, the controller can control the switching switch to control whether the energy generated by the generator is directly consumed in the energy-consuming resistor or sent to the DC grid after rectification.

[0104] The grid-connected operation control method mainly predicts the grid-connected power curve based on the power of the current device, dispatches the power indicators issued according to the predicted data, and controls the photovoltaic system and wave power generation system to work on demand in combination with the working status of the energy storage system and the station power supply unit, controls the charging and discharging of the energy storage battery, maintains the bus voltage stability, and maintains the long-term operation and stable power generation of the wave power generation device.

[0105] The present invention provides a method for controlling grid-connected operation of a wave power generation device, which is applied to the wave power generation device and comprises:

[0106] Step 201: respond to a grid-connected operation control request for a target device and determine the operation status of the target device.

[0107] In an embodiment of the present invention, in response to a grid-connected operation control request for a target device, the operating status of each unit is obtained through each unit controller, including whether the station power supply unit, the grid-connected unit, n groups of hydraulic power generation units, x groups of photovoltaic units, and m groups of energy storage units are operating normally, thereby determining whether the grid-connected power generation status of the entire target device is normal.

[0108] Step 202: When the operating state of the target device is an abnormal operating state, abnormal warning information is generated.

[0109] In the embodiment of the present invention, when the operation state of the target device is an abnormal operation state, abnormal warning information is generated. After receiving the abnormal warning information, the maintenance personnel will perform maintenance and troubleshooting on each unit in the target device.

[0110] See also Figure 4 , Figure 4 This is a flow chart of the target device grid-connected operation control, and steps 203 to 206 are the target device grid-connected operation control process:

[0111] Step 203: When the operating state of the target device is a normal operating state, the estimated power generation of the target device is obtained.

[0112] In the embodiment of the present invention, if the grid-connected power generation state of the target device is normal, the current power consumption, battery power, new energy power, loss power, etc. of the target device are obtained and calculated once every 1 second. While the calculation results are uploaded to the dispatch center, the target device calculates the average power within 5 minutes according to the above power comprehensive calculation system, and predicts the grid-connected power curve within the next 5 minutes according to the power trend, calculates the maximum grid-connected power, and then obtains the expected power generation of the target device and uploads it to the dispatch center at the same time.

[0113] Step 204: Compare the predicted power generation with the preset dispatched power generation.

[0114] In an embodiment of the present invention, the dispatching center issues a power index, wherein the power index refers to a preset dispatched power generation. The target device makes a comprehensive judgment based on the preset dispatched power generation issued by the dispatching center, combined with the current station load, energy storage battery capacity, current and predicted wave power generation, and photovoltaic power size to determine whether the expected power generation is sufficient, that is, to compare the expected power generation with the preset dispatched power generation.

[0115] For ease of understanding, the power index sent by the dispatching center specifically refers to the dispatching center based on the wave energy power generation curve. For example, it is expected that the target device can generate 400kW now and in the future, but the dispatching demand is very small, and only 300kW of wave energy is needed, so the indicator of 300kW of wave energy is sent.

[0116] Among them, a comprehensive judgment is made based on the current station load, energy storage battery capacity, current and predicted wave energy power generation and photovoltaic power. For ease of understanding, for example, if the current average wave energy power generation is 50kW, photovoltaic power is 50kW, and station load is 20kW, then if the power indicator issued by the dispatching center is 80kW, it is just balanced. If the indicator issued by the dispatching center is 100kW, the insufficient 20kW needs to be provided by temporary discharge of the battery.

[0117] Step 205: If the expected power generation is greater than or equal to the preset scheduled power generation, the target device is charged and regulated according to the charging period of the energy storage battery in the target device.

[0118] Further, step 205 may include the following sub-steps:

[0119] S11. If the expected power generation is greater than or equal to the preset scheduled power generation, determine whether the energy storage battery in the target device is in a charging period.

[0120] It should be noted that judging whether the energy storage battery is in the charging period or the discharging period is a conventional judgment method. For example, in the present invention, in order to protect the battery, the battery is always in a cycle of charging-discharging-charging-....... by program control, and one cycle must be completed before entering the next cycle, such as Figure 5T0 to T1 is a cycle, which is defined by the program itself, so it is easy to know whether the energy storage battery is charging or discharging.

[0121] See also Figure 5 , the energy storage system needs to control the periodic charge and discharge cycle of the energy storage battery to increase the battery life. Figure 5 As shown, each energy storage system is divided into two stages: charging and discharging. The SOC of the battery changes within a certain range. In the charging stage, as shown in the figure, from t0 to t1, from t2 to t3, and from t4 to t5, the overall goal of the energy storage battery is to charge. Even if a short discharge is required during the charging process due to the grid-connected control process, the overall direction of the energy storage battery's charging remains unchanged. After the battery's power is charged to the specified SOC, the charging process ends and the process turns to the discharging process. In the discharging stage, as shown in the figure, from t1 to t2, and from t3 to t4, the overall goal of the energy storage battery is to discharge. Even if a short discharge is required during the discharging process due to the grid-connected control process, the overall direction of the energy storage battery's discharge remains unchanged. After the battery's power is charged to the specified SOC, the charging process ends and the process turns to the discharging process.

[0122] It is worth mentioning that the periodic charge and discharge cycle of the energy storage battery refers to the charging and discharging of the energy storage battery within a specific range of power. Charging starts from the specified minimum power. When the specified power is reached, a round of charging is completed, and then it starts discharging. When the specified minimum power is reached, a round of discharging is completed, and then it starts charging again, and the cycle continues.

[0123] In the grid-connected operation mode, it is necessary to solve the problem of power balance between the dispatching power index and the uncontrolled power source, smooth the output power of the wave power generation device, and prevent the output power from fluctuating due to the sudden change of the power generation of new energy. While ensuring the maximum output of electric energy, the energy storage battery can be periodically charged and discharged to increase the service life of the battery.

[0124] In an embodiment of the present invention, if the expected power generation is greater than or equal to the preset scheduled power generation, it means that the power generation of the current target device is sufficient, and then it is determined whether the current battery is in the charging period based on the information fed back by the energy storage system unit controller.

[0125] S12: When the energy storage battery in the target device is in a charging period, the target device is regulated according to a preset first charging strategy.

[0126] Further, S12 may include the following sub-steps:

[0127] S121. When the energy storage battery in the target device is in the charging period, the estimated power generation and the preset scheduled power generation are used to perform a difference calculation to obtain the surplus power generation.

[0128] In an embodiment of the present invention, when the energy storage battery in the target device is in the charging period, the estimated power generation obtained by the power generation trend within the present and future T0 time period and the preset scheduled power generation are used for difference calculation to obtain the surplus power generation. Therefore, it is necessary to charge the energy storage battery and absorb the surplus power generation through the energy storage battery.

[0129] S122: Compare the surplus power generation and the charging capacity of the energy storage battery.

[0130] In the embodiment of the present invention, the surplus power generation and the charging power of the energy storage battery are compared, that is, the charging demand power of the energy storage battery is compared with the surplus power generation.

[0131] S123: If the surplus power generation is less than or equal to the charging power, control the energy storage battery to perform a charging operation.

[0132] In an embodiment of the present invention, if the surplus power generation is less than or equal to the charging power, it means that the surplus power generation is not higher than the battery charging demand, and can be absorbed by the energy storage battery. The energy storage battery continues to charge and absorb the surplus power, and the process ends.

[0133] S124: If the surplus power generation is greater than the charging power, the energy storage battery is controlled to perform a charging operation and the power generation unit in the target device is controlled to perform a power reduction operation until the surplus power generation is less than or equal to the charging power.

[0134] In an embodiment of the present invention, if the surplus power generation is greater than the charging power, it means that the surplus power generation is too much and exceeds the battery charging demand. The energy storage battery has limited charging absorption, and the energy storage battery continues to perform the charging operation. At the same time, through comprehensive judgment, some photovoltaic and wave power generation groups with corresponding power sizes are stopped, and the power generation power is reduced to meet the charging demand, and the process ends.

[0135] It should be noted that meeting charging needs specifically means that when the surplus power generation is higher than the charging demand of the energy storage battery, the corresponding photovoltaic and other generating units are controlled to stop working according to the part that exceeds the charging demand of the energy storage battery, so that the future generated electricity can just meet the charging demand.

[0136] S13: When the energy storage battery in the target device is not in the charging period, the target device is regulated according to a preset second charging strategy.

[0137] Furthermore, S13 may include the following sub-steps:

[0138] S131. When the energy storage battery in the target device is not in the charging period, the expected power generation and the preset scheduled power generation are used to perform a difference calculation to obtain the surplus power generation.

[0139] In an embodiment of the present invention, when the energy storage battery in the target device is not in the charging period, the difference calculation is performed between the expected power generation and the preset scheduled power generation to obtain the surplus power generation.

[0140] S132: Determine whether the surplus power generation is a preset first power generation threshold.

[0141] It should be noted that the preset first power generation threshold is 0.

[0142] In the embodiment of the present invention, it is determined whether the surplus power generation is a preset first power generation threshold.

[0143] S133: If the surplus power generation is the preset first power generation threshold, the target device is kept running in the current operating state.

[0144] In an embodiment of the present invention, if the surplus power generation is the preset first power generation threshold, it means that the expected power generation of the target device just meets the needs of the scheduling power index, the energy storage system, and the station power system, that is, the expected power generation is equal to the preset scheduling power generation, which is dynamically balanced and does not need to be adjusted. In this case, the target device is maintained in the current operating state and continues to operate, and the process ends.

[0145] S134: If the surplus power generation is not the preset first power generation threshold, control the energy storage battery to perform a charging operation and control the power generation unit in the target device to perform a power reduction operation until the surplus power generation reaches the preset first power generation threshold.

[0146] In the embodiment of the present invention, if the surplus power generation is not the preset first power generation threshold, there is surplus power generation, and the energy storage battery needs to be temporarily changed to the charging mode, and a part of the power is first absorbed by charging the energy storage battery. At the same time, after comprehensive judgment, some photovoltaic and wave power generation units are stopped to reduce the power generation. If there is still surplus power at this time, the above process is repeated again until the device no longer has surplus power generation. At this time, the charging mode of the energy storage battery is switched to the discharging mode, and the surplus power is no longer absorbed, and the process ends.

[0147] Step 206: If the estimated power generation is less than the preset scheduled power generation, the target device is regulated to discharge according to the discharge period of the energy storage battery in the target device.

[0148] Further, step 206 may include the following sub-steps:

[0149] S21. If the expected power generation is less than the preset scheduled power generation, determine whether the energy storage battery in the target device is in a discharge period.

[0150] In an embodiment of the present invention, if the estimated power generation is less than the preset scheduled power generation, it is determined whether the energy storage battery in the target device is in a discharge period.

[0151] S22: When the energy storage battery in the target device is in a discharge period, the target device is regulated according to a preset first discharge strategy.

[0152] Further, S22 may include the following sub-steps:

[0153] S221. When the energy storage battery in the target device is in the discharge period, the difference calculation is performed between the expected power generation and the preset scheduled power generation to obtain the shortfall power generation.

[0154] In an embodiment of the present invention, when the energy storage battery in the target device is in the discharge period, the difference calculation is performed between the estimated power generation obtained by the power generation trend within the present and future T1 time and the preset scheduled power generation to obtain the shortfall power generation.

[0155] S222. Compare the shortfall power generation and the discharge power of the energy storage battery.

[0156] Deficit power generation refers to the shortfall in electricity, specifically the electricity that needs to be reversely dispatched from the large power grid to the target device.

[0157] In the embodiment of the present invention, the shortfall power generation amount and the discharge amount of the energy storage battery are compared.

[0158] S223: If the deficit power generation is less than or equal to the discharge power, control the energy storage battery to perform a discharge operation.

[0159] In the embodiment of the present invention, if the shortfall in power generation is less than or equal to the discharge power, it means that the shortfall in power generation (i.e., the shortfall in power energy) of the target device is not higher than the discharge capacity of the energy storage battery, and the energy storage battery continues to discharge to provide the shortfall in power energy, and the process ends.

[0160] S224. If the power generation deficit is greater than the discharge power, the energy storage battery is controlled to perform a discharge operation and the power generation unit in the target device is controlled to perform a power boost operation until the power generation deficit is less than or equal to the discharge power.

[0161] In the embodiment of the present invention, if the deficit power generation is greater than the discharge power, it means that the power provided by the discharge of the energy storage battery is limited, and the energy storage battery continues to discharge. At the same time, through comprehensive judgment, some photovoltaic and wave power generation sets are started to increase the power generation power to meet the deficit power demand.

[0162] S23: When the energy storage battery in the target device is not in the discharge period, the target device is regulated according to a preset second discharge strategy.

[0163] Further, S23 may include the following sub-steps:

[0164] S231. When the energy storage battery in the target device is not in the discharge period, the difference calculation is performed using the expected power generation and the preset scheduled power generation to obtain the shortfall power generation.

[0165] In the embodiment of the present invention, when the energy storage battery in the target device is not in the discharge period, the difference calculation is performed between the expected power generation and the preset scheduled power generation to obtain the shortfall power generation.

[0166] S232: Determine whether the shortfall in power generation is a preset second power generation threshold.

[0167] It should be noted that the second power generation threshold is preset to be 0.

[0168] In the embodiment of the present invention, it is determined whether the shortfall power generation is a preset second power generation threshold.

[0169] S233: If the shortfall in power generation is equal to the preset second power generation threshold, the target device is kept running in the current operating state.

[0170] In an embodiment of the present invention, if the deficit power generation is 0, it means that the expected power generation of the target device just meets the needs of the scheduling power index, the energy storage system, and the station power system, that is, the expected power generation is equal to the preset scheduling power generation, which is dynamically balanced and does not need to be adjusted. In this case, the target device is maintained in the current operating state and continues to operate, and the process ends.

[0171] S234: If the power generation deficit is not the preset second power generation threshold, control the energy storage battery to perform a discharge operation and control the power generation unit in the target device to perform a power boost operation until the power generation deficit reaches the preset second power generation threshold.

[0172] In the embodiment of the present invention, if the shortfall in power generation is not the preset second power generation threshold, it means that the target device needs to dispatch electric energy from the large power grid in reverse, and needs to generate electricity through the energy storage battery. In this case, the energy storage battery needs to be temporarily changed to the discharge mode. Through the discharge of the energy storage battery, the target device first absorbs part of the electric energy, and at the same time starts some photovoltaic and wave power generators to increase the power generation. If there is still a gap in electric energy at this time, the above process is repeated again until all photovoltaic and generators are enabled or there is no gap in electric energy. At this time, the discharge mode of the energy storage battery is changed to the charging mode, and the process ends.

[0173] It is worth mentioning that the present invention smoothes the unstable output power of wave energy and photovoltaic systems by configuring a large-capacity energy storage system, so that the power transmitted to the power grid by the wave power generation device is stable and will not change suddenly. The wave power generation device uses the grid-connected operation control method according to the relationship characteristics between the station load, grid-connected power, energy storage system power, photovoltaic power generation power and wave power generation power, and controls the power supply power by appropriately controlling the input and output of the wave power generator set and the photovoltaic confluence and control unit, and controls the charging and discharging of the energy storage system to compensate or absorb the power, so as to stabilize the grid-connected output, solve the power balance problem between the grid-connected output, the energy storage system and the uncontrolled power supply, and thus achieve the goal of continuous and stable power generation of the wave power generation device.

[0174] In the present invention, a grid-connected operation control request for a target device is responded to, the operation state of the target device is determined, when the operation state of the target device is a normal operation state, the expected power generation of the target device is obtained, the expected power generation and the preset scheduled power generation are compared, if the expected power generation is greater than or equal to the preset scheduled power generation, the target device is charged and regulated according to the charging period of the energy storage battery in the target device, if the expected power generation is less than the preset scheduled power generation, the target device is discharged and regulated according to the discharge period of the energy storage battery in the target device; the present invention performs power regulation on the power generation unit in the target device and charge and discharge regulation on the battery energy storage system, so that the expected power generation of the target device meets the power demand of the station equipment, maintains the stability of the DC bus voltage, and maintains a certain amount of power in the battery, so as to achieve smooth grid-connected power, provide a stable and continuous power supply target for the power grid, and solves the technical problem of how to improve the grid-connected operation stability of the wave power generation device.

[0175] See also Figure 6 , Figure 6 This is a structural block diagram of a grid-connected operation control system for a wave power generation device provided in Embodiment 3 of the present invention.

[0176] The present invention provides a wave power generation device grid-connected operation control system, comprising:

[0177] A response module 301 is used to respond to a grid-connected operation control request for a target device and determine an operation state of the target device;

[0178] The power generation acquisition module 302 is used to acquire the estimated power generation of the target device when the operating state of the target device is a normal operating state;

[0179] A comparison module 303 is used to compare the estimated power generation with the preset dispatched power generation;

[0180] The first control module 304 is used to control the charging of the target device according to the charging period of the energy storage battery in the target device if the expected power generation is greater than or equal to the preset scheduled power generation;

[0181] The second control module 305 is used to control the discharge of the target device according to the discharge period of the energy storage battery in the target device if the expected power generation is less than the preset scheduled power generation.

[0182] Furthermore, the first control module 304 includes:

[0183] A first processing submodule, configured to determine whether the energy storage battery in the target device is in a charging period if the expected power generation is greater than or equal to the preset scheduled power generation;

[0184] A first control submodule, used for regulating the target device according to a preset first charging strategy when the energy storage battery in the target device is in a charging period;

[0185] The second control submodule is used to control the target device according to a preset second charging strategy when the energy storage battery in the target device is not in a charging period.

[0186] Furthermore, the first control submodule includes:

[0187] The first computing unit is used for performing a difference calculation between the expected power generation and the preset scheduled power generation to obtain the surplus power generation when the energy storage battery in the target device is in a charging period;

[0188] A first comparison unit, used for comparing the surplus power generation and the charging capacity of the energy storage battery;

[0189] A first execution unit, configured to control the energy storage battery to perform a charging operation if the surplus power generation is less than or equal to the charging power;

[0190] The second execution unit is used to control the energy storage battery to perform a charging operation and control the power generation unit in the target device to perform a power reduction operation if the surplus power generation is greater than the charging power, until the surplus power generation is less than or equal to the charging power.

[0191] Furthermore, the second control submodule includes:

[0192] The second computing unit is used for performing a difference calculation between the expected power generation and the preset scheduled power generation to obtain the surplus power generation when the energy storage battery in the target device is not in the charging period;

[0193] A second comparison unit is used to determine whether the surplus power generation is a preset first power generation threshold;

[0194] A third execution unit is used to keep the target device running in the current operating state if the surplus power generation is a preset first power generation threshold;

[0195] The fourth execution unit is used to control the energy storage battery to perform a charging operation and control the power generation unit in the target device to perform a power reduction operation if the surplus power generation is not a preset first power generation threshold, until the surplus power generation reaches the preset first power generation threshold.

[0196] Furthermore, the second control module 305 includes:

[0197] The second processing submodule is used to determine whether the energy storage battery in the target device is in a discharge period if the expected power generation is less than the preset scheduled power generation;

[0198] A third control submodule, used for regulating the target device according to a preset first discharge strategy when the energy storage battery in the target device is in a discharge period;

[0199] The fourth control submodule is used to control the target device according to a preset second discharge strategy when the energy storage battery in the target device is not in a discharge period.

[0200] Furthermore, the third control submodule includes:

[0201] The third operation unit is used for performing a difference operation between the expected power generation and the preset scheduled power generation to obtain the shortfall power generation when the energy storage battery in the target device is in the discharge period;

[0202] A third comparison unit is used to compare the shortfall power generation and the discharge power of the energy storage battery;

[0203] A fifth execution unit, configured to control the energy storage battery to perform a discharge operation if the deficit power generation is less than or equal to the discharge power;

[0204] The sixth execution unit is used to control the energy storage battery to perform a discharge operation and control the power generation unit in the target device to perform a power boost operation if the power generation deficit is greater than the discharge power, until the power generation deficit is less than or equal to the discharge power.

[0205] Furthermore, the fourth control submodule includes:

[0206] The fourth operation unit is used to perform a difference operation between the expected power generation and the preset scheduled power generation to obtain the shortfall power generation when the energy storage battery in the target device is not in the discharge period;

[0207] A fourth comparison unit, used for determining whether the shortfall power generation is a preset second power generation threshold;

[0208] a seventh execution unit, configured to keep the target device in operation at the current moment if the shortfall in power generation is a preset second power generation threshold;

[0209] The eighth execution unit is used to control the energy storage battery to perform a discharge operation and control the power generation unit in the target device to perform a power boost operation if the power generation deficit is not a preset second power generation threshold, until the power generation deficit reaches the preset second power generation threshold.

[0210] In the present invention, a grid-connected operation control request for a target device is responded to, the operation state of the target device is determined, when the operation state of the target device is a normal operation state, the expected power generation of the target device is obtained, the expected power generation and the preset scheduled power generation are compared, if the expected power generation is greater than or equal to the preset scheduled power generation, the target device is charged and regulated according to the charging period of the energy storage battery in the target device, if the expected power generation is less than the preset scheduled power generation, the target device is discharged and regulated according to the discharge period of the energy storage battery in the target device; the present invention performs power regulation on the power generation unit in the target device and charge and discharge regulation on the battery energy storage system, so that the expected power generation of the target device meets the power demand of the station equipment, maintains the stability of the DC bus voltage, and maintains a certain amount of power in the battery, so as to achieve smooth grid-connected power, provide a stable and continuous power supply target for the power grid, and solves the technical problem of how to improve the grid-connected operation stability of the wave power generation device.

[0211] See also Figure 7 , Figure 7 This is a structural block diagram of a computer device provided in Embodiment 4 of the present invention.

[0212] An electronic device according to an embodiment of the present invention includes: a memory 401 and a processor 402, wherein the memory 402 stores a computer program; when the computer program is executed by the processor 402, the processor 402 executes the grid-connected operation control method of the wave power generation device according to any of the above embodiments.

[0213] The memory 401 may be an electronic memory such as a flash memory, an EEPROM (electrically erasable programmable read-only memory), an EPROM, a hard disk or a ROM. The memory 401 has a storage space 403 for a program code 413 for executing any method step in the above method. For example, the storage space 403 for the program code may include individual program codes 413 for implementing the various steps in the above method, respectively. These program codes may be read from or written to one or more computer program products. These computer program products include program code carriers such as hard disks, compact disks (CDs), memory cards or floppy disks. The program code may be compressed, for example, in an appropriate form. When these codes are run by a computing and processing device, the computing and processing device performs the various steps in the method described above. These program codes may be read from or written to one or more computer program products. These computer program products include program code carriers such as hard disks, compact disks (CDs), memory cards or floppy disks. The program code may be compressed, for example, in an appropriate form. When these codes are executed by a computing and processing device, the computing and processing device is caused to execute each step of the above-described method for controlling grid-connected operation of a wave power generation device.

[0214] Embodiment 5 of the present invention further provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the method for controlling grid-connected operation of a wave power generation device according to any of the above embodiments is implemented.

[0215] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0216] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0217] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0218] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0219] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods of 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, etc. Various media that can store program codes.

[0220] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for controlling grid-connected operation of a wave power generation device, characterized in that: include: In response to a grid-connected operation control request for a target device, determine an operation state of the target device; When the operating state of the target device is a normal operating state, obtaining the estimated power generation of the target device; comparing the predicted power generation with the preset dispatched power generation; If the estimated power generation is greater than or equal to the preset scheduled power generation, charging the target device is regulated according to the charging period of the energy storage battery in the target device; If the predicted power generation is less than the preset scheduled power generation, the target device is discharged and regulated according to the discharge period of the energy storage battery in the target device.

2. The grid-connected operation control method of a wave power generation device according to claim 1, characterized in that: If the expected power generation is greater than or equal to the preset scheduled power generation, charging control is performed on the target device according to the charging period of the energy storage battery in the target device, including: If the estimated power generation is greater than or equal to the preset scheduled power generation, determining whether the energy storage battery in the target device is in a charging period; When the energy storage battery in the target device is in a charging period, the target device is regulated according to a preset first charging strategy; When the energy storage battery in the target device is not in the charging period, the target device is regulated according to a preset second charging strategy.

3. The grid-connected operation control method of a wave power generation device according to claim 2, characterized in that: When the energy storage battery in the target device is in a charging period, the target device is regulated according to a preset first charging strategy, including: When the energy storage battery in the target device is in the charging period, the estimated power generation and the preset scheduled power generation are used to perform a difference calculation to obtain the surplus power generation; comparing the surplus power generation with the charging capacity of the energy storage battery; If the surplus power generation is less than or equal to the charging power, controlling the energy storage battery to perform a charging operation; If the surplus power generation is greater than the charging power, the energy storage battery is controlled to perform a charging operation and the power generation unit in the target device is controlled to perform a power reduction operation until the surplus power generation is less than or equal to the charging power.

4. The grid-connected operation control method of a wave power generation device according to claim 2, characterized in that: When the energy storage battery in the target device is not in the charging period, the target device is regulated according to a preset second charging strategy, including: When the energy storage battery in the target device is not in the charging period, the estimated power generation and the preset scheduled power generation are used to perform a difference calculation to obtain the surplus power generation; Determining whether the surplus power generation is a preset first power generation threshold; If the surplus power generation is the preset first power generation threshold, maintaining the target device in the current operating state and continuing to operate; If the surplus power generation is not the preset first power generation threshold, the energy storage battery is controlled to perform a charging operation and the power generation unit in the target device is controlled to perform a power reduction operation until the surplus power generation reaches the preset first power generation threshold.

5. The grid-connected operation control method of a wave power generation device according to claim 1, characterized in that: If the expected power generation is less than the preset scheduled power generation, the target device is discharged and regulated according to the discharge period of the energy storage battery in the target device, including: If the estimated power generation is less than the preset scheduled power generation, determining whether the energy storage battery in the target device is in a discharge period; When the energy storage battery in the target device is in a discharge period, the target device is regulated according to a preset first discharge strategy; When the energy storage battery in the target device is not in the discharge period, the target device is regulated according to a preset second discharge strategy.

6. The grid-connected operation control method of a wave power generation device according to claim 5, characterized in that: When the energy storage battery in the target device is in a discharge period, the target device is regulated according to a preset first discharge strategy, including: When the energy storage battery in the target device is in the discharge period, the estimated power generation and the preset scheduled power generation are used to perform a difference calculation to obtain the shortfall power generation; Comparing the shortfall power generation with the discharge power of the energy storage battery; If the deficit power generation is less than or equal to the discharge power, controlling the energy storage battery to perform a discharge operation; If the power generation deficit is greater than the discharge power, the energy storage battery is controlled to perform a discharge operation and the power generation unit in the target device is controlled to perform a power boost operation until the power generation deficit is less than or equal to the discharge power.

7. The grid-connected operation control method of a wave power generation device according to claim 5, characterized in that: When the energy storage battery in the target device is not in the discharge period, the target device is regulated according to a preset second discharge strategy, including: When the energy storage battery in the target device is not in the discharge period, the estimated power generation and the preset scheduled power generation are used to perform a difference calculation to obtain the shortfall power generation; Determining whether the shortfall power generation is a preset second power generation threshold; If the shortfall power generation is the preset second power generation threshold, maintaining the target device in the current operating state and continuing to operate; If the power generation deficit is not the preset second power generation threshold, the energy storage battery is controlled to perform a discharge operation and the power generation unit in the target device is controlled to perform a power boost operation until the power generation deficit reaches the preset second power generation threshold.

8. A wave power generation device grid-connected operation control system, characterized in that: include: A response module, used to respond to a grid-connected operation control request for a target device and determine an operation state of the target device; A power generation acquisition module, used for acquiring the estimated power generation of the target device when the operating state of the target device is a normal operating state; A comparison module, used for comparing the predicted power generation with the preset dispatched power generation; A first control module, configured to control charging of the target device according to a charging period of an energy storage battery in the target device if the expected power generation is greater than or equal to the preset scheduled power generation; The second control module is used to control the discharge of the target device according to the discharge period of the energy storage battery in the target device if the expected power generation is less than the preset scheduled power generation.

9. An electronic device, characterized in that: The invention comprises a memory and a processor, wherein a computer program is stored in the memory, and when the computer program is executed by the processor, the processor executes the steps of the method for controlling grid-connected operation of a wave power generation device according to any one of claims 1 to 7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed, the grid-connected operation control method of the wave power generation device according to any one of claims 1 to 7 is implemented.

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