An oil-electric hybrid energy control system and control method for an offshore operating platform

Abstract

The present invention discloses an oil-electric hybrid energy control system and control method for an offshore operating platform, including an energy storage control system for recovering, storing and reusing the braking potential energy of the operating equipment and an electric energy management system for controlling a generator set to provide energy for the operating equipment; the energy storage control system is used to recover the braking potential energy of the operating equipment and convert it into electrical energy and store it through an energy storage battery or supply power to the operating equipment; the energy control system of the present invention can recover and convert the braking potential energy and store it through a storage medium such as a battery, and can control the battery to supply power to the operating equipment when the operating equipment needs it, thereby realizing resource recycling; in addition, the number of generators that need to be operated can be automatically controlled according to the system load, and the generators can be automatically increased or decreased, thereby improving energy efficiency and reducing the operating cost of the offshore platform.

Description

Technical Field

[0001] The present invention relates to the field of offshore clean energy technology, and in particular to an oil-electric hybrid energy control system and a control method for an offshore operating platform. Background Art

[0002] In recent years, with the rapid development of marine new energy development, as one of the new energy sources with the largest scale development and commercial development prospects, the scope of offshore wind power development has gradually expanded from shallow offshore to deep sea. With the increase in the distance from the shore, the assembly and transportation of offshore wind turbines need to rely on large-scale operating platforms such as self-propelled and self-elevating installation vessels that integrate loading, transportation and installation functions suitable for offshore wind turbine installation. Conventional offshore operating platforms such as wind power installation vessels generally achieve self-elevation through a number of elevable pile legs, and the platform will be equipped with specific operating mechanisms such as lifting devices.

[0003] Existing offshore work platforms are basically powered by generators. When the generator drives specific working mechanisms on the offshore work platform, such as lifting devices, pile legs, etc., to operate, a large amount of diesel energy is consumed, that is, multiple groups of diesel generator sets are required to respectively control different specific working mechanisms to perform specific working actions, so that different diesel generator sets can meet the different power requirements of different specific working mechanisms when lifting, descending, moving or other specific working actions. The generator set cannot be quickly adjusted in real time to match the above power requirements. It can be seen that the supply method of the existing power supply system is costly and the response speed needs to be improved. In addition, the work platform does not have the function of energy storage and recycling. When the specific working mechanism is braked, its gravitational potential energy cannot be effectively stored, resulting in energy waste.

[0004] Therefore, further research and development is needed to solve the problems existing in the above-mentioned prior art. Summary of the invention

[0005] In order to solve the technical problems existing in the above-mentioned prior art, one of the purposes of the present invention is to provide an oil-electric hybrid energy control system for an offshore operating platform, which can recycle and transform the braking potential energy generated by operating equipment such as lifting equipment and lifting pile legs when descending and store it through storage media such as batteries, and control the batteries to supply power to the operating equipment when needed. In this way, the braking potential energy of the offshore platform operating equipment can be recycled and regenerated, which greatly reduces energy waste. When needed, the platform can meet its own electricity needs through the stored electricity, reducing dependence on external power supply, which is particularly important for offshore wind power projects far away from land; it also reduces the demand for fuel power generation of traditional diesel generators, which can reduce the power supply pressure of the generator set and is more energy-saving and environmentally friendly; in addition, it can achieve higher energy efficiency, reduce the operating cost of the offshore platform, and improve the reliability and economic benefits of the offshore wind power installation platform, which is more in line with the development trend of clean energy development.

[0006] A second object of the present invention is to provide a control method for an oil-electric hybrid energy control system of an offshore operating platform.

[0007] One of the purposes of the present invention is achieved through the following technical solutions:

[0008] The oil-electric hybrid energy control system includes an energy storage control system for recovering, storing and reusing the braking potential energy of the operating equipment and an electric energy management system for controlling the generator set to provide energy for the operating equipment. Both the energy storage control system and the electric energy management system transmit electric energy to the operating equipment through the AC power grid;

[0009] The energy storage control system is used to recover the braking potential energy of the operating equipment, convert it into electrical energy and store it through an energy storage battery; the energy storage battery is connected to the AC power grid of the offshore operating platform through an AC-DC converter, and is connected to the operating equipment to achieve potential energy recovery and storage or supply power to the operating equipment; the energy storage battery is monitored by the BMS battery management system and transmits signals to the system; the energy storage control system receives the signal of the BMS battery management system to make judgments and control the charging / discharging of the energy storage battery;

[0010] The generator set includes at least two generators whose start sequence is set according to the load of the system switchboard. The power energy management system monitors the load demand of the generator set to control the start / stop of the corresponding generator according to the set generator set sequence.

[0011] Furthermore, the BMS battery management system includes an AFE active front-end simulation unit; the energy storage control system receives the data of the SOC, pressure, and temperature of the energy storage battery monitored by the BMS battery management system and controls the BMS battery management system and the AFE active front-end simulation unit to coordinately control the charge / discharge management of the energy storage battery, so as to realize the recovery and storage of potential energy, and to supply power to the operating equipment with the electric energy stored in the energy storage battery through the AC-DC converter.

[0012] Furthermore, when it is necessary to supply power to the operating equipment and the start-up conditions of multiple control systems are met, the start-up priority of the energy storage control system is higher than that of the electric power management system; the energy storage control system is preferably started to control the energy storage battery to release the stored electric energy to supply power to a specific operating system until the SOC of the energy storage battery drops to the lower limit threshold, and the electric power management system receives the signal of the BMS battery management system and controls the start-up of the generator of the generator set.

[0013] Furthermore, the generator set includes a first generator, a second generator, a third generator, a fourth generator, and a fifth generator according to a load start sequence of a system distribution board; and the minimum number of online generators is set to 1 according to the start sequence. When more than two generators are online, the system load is equally divided by all the online generators.

[0014] Furthermore, the first starting limit, the second starting limit, the first starting delay, and the second starting delay of the generator are set according to the load of the system distribution board, and the corresponding generator is started according to the starting sequence according to the load to increase / decrease the number of running generators.

[0015] Further, the first start limit is greater than the stop limit and less than the second start limit; the first start time delay is greater than the second start time delay;

[0016] When the load is less than the first start limit, the electric power energy management system controls the first generator to start after a first start time delay;

[0017] When the load is greater than the first start limit and less than the second start limit, the power energy management system controls the second generator to start after a first start delay and synchronize with the first generator;

[0018] When the load is greater than the second start limit, the electric power energy management system controls the third generator to start after a second start delay time.

[0019] Furthermore, the shutdown limit and shutdown delay of the generator are set according to the load of the system distribution board; when the load is less than the shutdown limit, the power energy management system controls the running generator to slow down and disconnect, and shut down after the shutdown delay.

[0020] Furthermore, the offshore operating platform is a self-elevating wind power installation platform, and the operating equipment includes lifting pile legs, lifting equipment, wind power installation tooling, thrusters, compensation systems, and positioning systems; the wind power installation platform is provided with a power supply compartment.

[0021] The second object of the present invention is achieved by the following technical solutions:

[0022] A control method for an oil-electric hybrid energy control system of an offshore operating platform comprises the following steps:

[0023] S1: When the operating equipment requests electric energy from the system through the communication interface, the energy storage control system is started first to control the energy storage battery to release the stored electric energy to supply power to the operating equipment;

[0024] S2: The SOC of the energy storage battery drops to a set value, the power energy management system receives a signal from the BMS battery management system, and controls the first generator of the start sequence to start;

[0025] S3: The system detects the load of the first generator and makes a control. When the load is greater than the first start limit and less than the second start limit, the power energy management system controls the second generator to start after the first start time delay and synchronize with the first generator; when the load is greater than the second start limit, the power energy management system controls the third generator to start after the second start time delay;

[0026] S4: When the operating equipment completes the operation and the system load drops to less than the first start limit, the power energy management system controls the running second generator and third generator to slow down and disconnect;

[0027] S5: When the load is less than the shutdown limit, the power energy management system controls the running generator to slow down and disconnect, and delay shutdown after the shutdown time.

[0028] Furthermore, the electric power energy management system also includes an alarm processing module for detecting a timeout in starting a generator set; after the alarm processing module detects that the generator to be started has not started after the first start-up delay or the second start-up delay, it transmits the signal to the electric power energy management system and controls the start-up of the next generator to be started in the sequence.

[0029] Compared with the prior art, the present invention has at least the following beneficial effects:

[0030] (1) The energy control system of the present invention can recycle and transform the braking potential energy generated by operating equipment such as lifting equipment and lifting pile legs during descent and store it through storage media such as batteries. When the operating equipment needs it, the battery can be controlled to supply power to it. In this way, the braking potential energy of offshore platform operating equipment can be recycled and regenerated, greatly reducing energy waste. When needed, the platform can meet its own electricity needs through stored electrical energy, reducing dependence on external power supply, which is particularly important for offshore wind power projects far from land. It also reduces the demand for fuel power generation from traditional diesel generators, can reduce the power supply pressure of generator sets, and is more energy-efficient and environmentally friendly. In addition, it can achieve higher energy efficiency, reduce the operating costs of offshore platforms, and improve the reliability and economic benefits of offshore wind power installation platforms, which is more in line with the development trend of clean energy development.

[0031] (2) The energy control system of the present invention can automatically control the number of generators that need to be run according to the system load, that is, automatically increase or decrease the number of online generators; set the start sequence of the generator set and the start limit, start delay, shutdown limit, etc. according to the system load; in this way, the operation of the generator set can be managed through real-time monitoring and dynamic adjustment; for example, if the load of the first generator is set to X%, the load is the judgment standard of the first start limit. If the load increases to more than X%, the power energy management system will control the second generator in the sequence to start after the corresponding start delay; and so on; conversely, when the load decreases, the power energy management system can also control the second generator in the sequence to slow down and shut down; the efficient control of the energy management system of the present invention ensures the power availability of the wind power installation platform, can avoid unnecessary generator start-ups, reduce fuel consumption, reduce carbon emissions, and contribute to energy conservation and environmental protection; in addition, it can dynamically adjust power production, avoid unnecessary waste, and improve energy utilization efficiency; the efficient control of the energy management system of the present invention helps to maximize the use of fuel. Generators are started only when needed, which reduces unnecessary fuel consumption and is beneficial to cost control;

[0032] (3) The setting of the alarm processing module for detecting the start-up timeout of the generator set of the present invention can automatically adjust and start the next generator, which helps to reduce the downtime of the fault; when a generator fails to start or fails, the system quickly switches to the backup generator, avoiding long-term power outages, which is conducive to ensuring the stability of the platform power system. The platform can deal with unexpected failures or generator start-up problems, reducing the risk of the system being affected;

[0033] (4) The energy control system of the present invention has a high degree of automation, which reduces the number of generator sets. When the conditions are met, the energy storage control system is started first to control the energy storage battery to release the stored electric energy to supply power to the operating equipment. When the SOC of the energy storage battery drops to the lower limit threshold, the power energy management system receives the signal of the BMS battery management system and controls the start-up of the first generator in the start sequence. This ensures the utilization of the electric energy of the energy storage battery. When the operating equipment such as the crane descends after completing the lifting work, the discharged energy storage battery can store the descending potential energy of the crane in time, forming an energy control cycle, maximizing the utilization of the energy storage battery, reducing the electricity cost by at least 1 / 6, improving the sustainability of the energy system, and being more energy-saving and environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a control relationship diagram of an oil-electric hybrid energy control system for an offshore operating platform in a preferred embodiment of the present invention;

[0035] Figure 2 This is a control relationship diagram of the generator set and the electric power management system of the oil-electric hybrid energy control system of the offshore operating platform in a preferred embodiment of the present invention;

[0036] Figure 3 This is a diagram showing the relationship between the generator start-up timeout alarm judgment and processing of the oil-electric hybrid energy control system of the offshore operating platform in a preferred embodiment of the present invention;

[0037] Figure 4 This is a connection diagram of an energy storage control system and a battery alarm system of an oil-electric hybrid energy control system of an offshore operating platform in a preferred embodiment of the present invention;

[0038] Figure 5 This is a reference diagram of an offshore operating platform of an oil-electric hybrid energy control system of an offshore operating platform according to a preferred embodiment of the present invention.

[0039] In the figure:

[0040] 1. Energy storage control system; 11. Energy storage battery; 12. BMS battery management system; 13. AC-DC converter; 14. AFE active front-end analog unit; 15. Circuit breaker; 2. Power energy management system; 3. Distribution board;

[0041] 10. Offshore operating platform; 101. Operating equipment; 102. Generator set; 1021. First generator; 1022. Second generator; 1023. Third generator; 1024. Fourth generator; 1025. Fifth generator. DETAILED DESCRIPTION

[0042] In order to facilitate the understanding of the present invention, the technical solutions and advantages of the invention are further described in detail below in conjunction with the accompanying drawings and embodiments. The specific structure and characteristics of the present invention are described below by way of example, which should not constitute any limitation to the present invention. At the same time, any of the following technical features mentioned (including implicit or disclosed), as well as any technical features directly displayed or implied in the figure, can continue to be arbitrarily combined or deleted between these technical features, so as to form more other embodiments that may not be directly or indirectly mentioned in the present invention. The preferred embodiments of the present invention are given in the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly and comprehensively understood.

[0043] Unless otherwise specified, the methods or principles in the following embodiments are conventional methods or principles in the art.

[0044] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0045] like Figure 1-5 As shown, the present invention provides an oil-electric hybrid energy control system for an offshore operating platform, wherein the offshore operating platform 10 includes an operating device 101 and a generator set 102 for providing energy to the operating device 101; the oil-electric hybrid energy control system includes an energy storage control system 1 for recovering, storing, and reusing the braking potential energy of the operating device 101, and an electric energy management system 2 for controlling the generator set 102 to provide energy for the operating device 101; the energy storage control system 1 and the electric energy management system 2 both transmit electric energy to the operating device 101 through an AC power grid;

[0046] Specifically, the offshore work platform 10 is a self-elevating wind power installation platform, and the work equipment 101 includes but is not limited to lifting pile legs and lifting equipment; the wind power installation platform is provided with a power supply compartment. In this embodiment, the offshore work platform is an offshore wind power installation platform, which is used for offshore installation of wind power. It can recover the braking potential energy of work equipment such as lowering pile legs and lifting equipment to achieve energy regeneration, and can automatically increase or decrease the running generator according to the load of the generator set. Compared with the traditional method of only using diesel generators, the cost is saved by at least 1 / 6, which is economical, efficient, and more environmentally friendly.

[0047] The energy storage control system 1 is used to recover the braking potential energy of the operating equipment, convert it into electrical energy and store it through the energy storage battery 11; specifically, it includes converting the descending potential energy of the lifting equipment into electrical energy by using an inverter, and then converting it through an AC-DC converter, which can be stored in the energy storage battery; the energy storage battery 11 is connected to the AC power grid of the offshore operating platform through an AC-DC converter 13, and is connected to the operating equipment 101 to realize potential energy recovery and storage or supply power to the operating equipment 101; the energy storage battery 11 is monitored by the BMS battery management system 12 and transmits signals to the system; the energy storage control system 1 receives the signal of the BMS battery management system 12 to make a judgment and control the charging / discharging of the energy storage battery 11;

[0048] The generator set 102 includes at least two generators whose start sequence is set according to the load of the system switchboard. The power energy management system 2 monitors the load demand of the generator set 102 to control the start / stop of the corresponding generator according to the set generator set sequence.

[0049] In this embodiment, the main purpose of the power energy management system is to ensure that there is enough available power under actual operating conditions, which is obtained by monitoring the load and status of the generator sets and the power system. The power energy management system is responsible for monitoring and managing the load on the platform and adjusting the power supply plan in real time according to the load demand.

[0050] The main design goal of the energy storage control system of this embodiment is to provide the required functions to support the following operations:

[0051] 1. Realize the mixed use control of diesel generators and energy storage batteries;

[0052] 2. Power balance management: The energy storage control system monitors the status of the battery and the power demand of the platform. When the platform needs power, it can release power from the energy storage battery as needed to meet the load demand. When the potential energy is generated when the lifting equipment or the hull is lowered, the energy storage control system can convert it through inverters, AC-DC converters, etc. and store it in the battery for use when needed. This helps balance energy supply and demand and improve the stability of the power system.

[0053] In this embodiment, the oil-electric hybrid energy control system further includes a circuit breaker 15. The circuit breaker 15 provides the possibility of additional electrical protection by isolating the energy storage control system from the power grid.

[0054] Specifically, offshore operation platform operations involve hoisting operations, lifting operations, etc. For this purpose, the operation equipment 101 deployed on the offshore operation platform includes but is not limited to lifting pile legs and lifting equipment. Taking the lifting equipment as an example, the energy storage control system of the present invention is further described.

[0055] At present, cranes include a heavy object lowering link in each working cycle. At this time, potential energy will be converted into kinetic energy, thereby generating a certain amount of regenerative energy. If this energy cannot be recycled, it will cause a large amount of reactive power loss. In addition, the crane will release energy when the heavy object is lowered and decelerated, and there will be unused idle energy output when idling. If the energy storage device is used to recover the waste energy and then the recovered energy is added to the energy control system, the diesel generator assembly capacity configuration can be reduced, and energy consumption can be reduced, thereby achieving the purpose of energy saving and emission reduction, so as to achieve the purpose of the present invention.

[0056] Taking a crane as an example, the main principle of the energy storage control system for recovering and storing the braking potential energy of the operating equipment is: when the mechanism brakes, the crane's motor is transformed into a generator, and the braking energy drives the electrical energy generated by the motor to be stored.

[0057] For example, during the operation of the crane, the feedback potential energy is directly converted into DC power by the motor of the lifting mechanism. It is understandable that the lifting mechanism does not need to be powered by a generator set during the descent process, and the potential energy stored in the ascending process is mainly released as the total energy. During this process, the lifting motor (working mechanism motor) reverses to generate electricity, converting the potential energy into electrical energy, which is finally consumed by the braking resistor.

[0058] The energy consumed by cranes mainly includes mechanical potential energy, inertia braking, idle loss, etc. During the operation of the crane, the load is heavy and the lifting height is high. Frequent lifting, luffing, starting, braking and other operations are required. During the process of reducing the amplitude, lowering and braking of the goods, a large amount of regenerative energy of the load potential energy will be converted into kinetic energy and transmitted to the motor of the working mechanism. At this time, the motor can be converted into a generator to generate electrical energy for recovery and storage.

[0059] Therefore, in this embodiment, the potential energy generated by the crane descending can be converted into alternating current through an inverter, and the alternating current can be converted into direct current through an AC-DC converter and stored in a battery.

[0060] In this embodiment, the BMS battery management system plays an important role, especially in the management and monitoring of energy storage batteries. BMS is responsible for monitoring the status of energy storage batteries, including voltage, current, temperature, battery capacity, state of charge (SOC, State of Charge), etc. And transmits signals to the energy storage control system so that the energy storage control system can make controls according to the status of the battery. BMS is usually equipped with communication interfaces, such as CAN bus or other communication protocols. These interfaces enable BMS to transmit processed data to the energy storage control system. In addition, the BMS battery management system can manage the charging and discharging process of the battery and optimize the use of the battery according to system requirements.

[0061] The SOC (State Of Charge), that is, the available power of the battery, belongs to the core control algorithm of the BMS battery management system. It uses the ampere-hour integration method and the EKF (extended Kalman filter) algorithm, and combines the algorithm results to correct the control strategy (such as open circuit voltage correction, full charge correction, end-of-charge correction, capacity correction at different temperatures and SOH, etc.).

[0062] In the present invention, the architecture, signal transmission and feedback control process between the energy storage control system, the BMS battery management system and the energy storage battery are as follows:

[0063] The energy storage battery can be a lithium battery, and the energy storage battery can be provided with a voltage sensor and a current sensor, which are connected to the control unit of the BMS battery management system through wires or connectors of the prior art, and the control unit of the BMS receives and interprets the data of the sensors through CAN. The SOC of the battery is calculated based on the received data, and the calculation method can be an integration method, that is, the amount of charge obtained by integrating the measured current. The calculation formula can refer to: SOC(t)=SOC(t-1)+ΔQ(t) / Qmax, where SOC(t) is the SOC at time t; SOC(t-1) is the SOC at time t-1; ΔQ(t) is the charge change calculated by current integration within time t; Qmax is the rated capacity of the battery.

[0064] The BMS battery management system will monitor the SOC status of the energy storage battery and transmit the parameters to the energy storage control system through the communication interface; by setting the upper and lower limit thresholds of the SOC, when the SOC is lower than the set charging threshold, the BMS will issue an alarm, and the energy storage control system will start the charging process by controlling the inverter or the charging control unit; when the SOC is higher than the set discharge threshold, the BMS will issue an alarm, and the energy storage control system will start the discharge process through the inverter or the discharge control unit.

[0065] The energy storage control system architecture of the present invention also includes a sensor module, a controller module, and an inverter module. The sensor module is used to monitor the status of the lifting equipment, including information such as descent speed, load weight, and height. The controller module controls the operation of the entire energy storage control system based on real-time data provided by the sensor module. Its control algorithm can be a PID (proportional-integral-differential) control algorithm to adjust various parameters in the energy recovery, storage, and release processes for rapid response. When the crane descends, the potential energy generated can be decelerated by a braking device and the kinetic energy can be converted into direct current. The energy storage control system can convert the braking potential energy of a generator or other power generation unit into alternating current through the inverter, and use the direct current converted from AC-DC to charge the energy storage battery, thereby maximizing energy recovery and reducing energy waste.

[0066] As a further preferred solution, the BMS battery management system 12 includes an AFE active front-end simulation unit 14; the energy storage control system 1 receives the data of the SOC, pressure, and temperature of the energy storage battery 11 monitored by the BMS battery management system 12 and controls the BMS battery management system 12 and the AFE active front-end simulation unit 14 to cooperate in controlling the charge / discharge management of the energy storage battery 13, so as to realize the recovery and storage of potential energy, and to supply power to the operating equipment through the AC-DC converter 13 with the electric energy stored in the energy storage battery. In this embodiment, the function of the AFE active front-end simulation unit is mainly to convert the analog signals from the current and voltage sensors into digital signals, and provide more accurate battery status information to the BMS, and at the same time participate in the monitoring of the battery charging and discharging process, so as to ensure that the energy storage battery is charged and discharged according to the SOC target value to avoid overcharging. The monitoring of the energy storage battery by AFE helps to maximize the performance of the energy storage battery and extend its service life.

[0067] In this embodiment, the AFE active front-end analog unit also includes a battery voltage conversion and measurement circuit, a battery balancing drive circuit, a switch drive circuit, a current measurement, and a communication circuit; the corresponding functions can refer to the prior art and are not described here. The back-end data processing module of the BMS battery management system 12 has the function of front-end calculation based on monitoring the voltage, current, temperature, etc. of the energy storage battery, and transmits the necessary information back to the system through the communication interface for control.

[0068] Further refinement, when it is necessary to supply power to the operating equipment 101 and the startup conditions of multiple control systems are met, the startup priority of the energy storage control system 1 is higher than that of the electric energy management system 2; the energy storage control system 1 is preferably started to control the energy storage battery 11 to release the stored electric energy to supply power to the operating equipment; until the SOC of the energy storage battery drops to the lower limit threshold, the electric energy management system receives the signal of the BMS battery management system and controls the generator of the generator set to start. Specifically, the electric energy management system and the energy storage control system exchange data through communication modules such as CAN, and the control unit of the energy storage control system sends the calculated SOC value of the energy storage battery to the electric energy management system through the communication module. The electric energy management system determines the system operation mode according to factors such as the system load demand, battery SOC, and generator status, including when to start the energy storage system and when to start the diesel generator. The electric energy management system formulates the startup sequence of the energy storage control system, and sends the load demand and the startup signal to the energy storage control system at the same time. After receiving the signal, the energy storage control system performs the corresponding operation.

[0069] When the energy storage battery completes the discharge operation, the energy storage system issues a control instruction to control the charging process of the energy storage battery until its SOC is higher than the set discharge threshold. The BMS issues an alarm again, and the energy storage control system sends the calculated SOC value of the energy storage battery to the power energy management system through the communication module to control the reduction of the number of online generators. At the same time, the energy storage control system issues an instruction again to start the discharge process through the inverter or discharge control unit. In this way, the energy storage control system and the power energy management system cooperate and adjust dynamically in real time to complete an efficient control process and maximize the use of the braking potential energy of the operating equipment.

[0070] This is also the key to the present invention. The energy control system of the present invention has a high degree of automation, reduces the number of generator sets, and gives priority to starting the energy storage control system to control the energy storage battery to release the stored electric energy to supply power to the operating equipment when the conditions are met. When the SOC of the energy storage battery drops to the set threshold, the power energy management system receives the signal of the BMS battery management system and controls the start-up of the first generator in the start sequence, thereby ensuring the utilization of the electric energy of the energy storage battery. When the operating equipment such as the crane completes the lifting work, the discharged energy storage battery can store the descending potential energy of the crane in time, forming an energy control cycle, maximizing the utilization of the energy storage battery, reducing electricity costs and dependence on generators, achieving multiple goals at one stroke, and improving the sustainability of the energy system.

[0071] As a further preferred solution, the generator set 102 includes a first generator 1021, a second generator 1022, a third generator 1023, a fourth generator 1024, and a fifth generator 1025 according to the system distribution board load start sequence; and the minimum number of online generators is set to 1 according to the start sequence. When more than two generators are online, the system load is evenly divided by all the online generators. In this embodiment, the minimum number of running generators is set to 1, which can be to start the first generator after the energy storage control system controls the energy storage battery to supply power, that is, a generator is online alone, or a motor and an energy storage battery are online. When more than two generators are online, the system load is evenly divided by all the online generators, which means that the generators in the sequence set the point according to the percentage of the system load, and the other generators started later share the remaining load.

[0072] As a further preferred solution, the first starting limit, the second starting limit, the first starting delay and the second starting delay of the generator are set according to the load of the system distribution board 3, and the corresponding generator is started according to the starting sequence according to the load to increase / decrease the number of running generators.

[0073] As a further preferred solution, the first start limit is greater than the stop limit and less than the second start limit; the first start time delay is greater than the second start time delay;

[0074] When the load is less than the first start limit, the electric power energy management system controls the first generator to start after a first start time delay;

[0075] When the load is greater than the first start limit and less than the second start limit, the power energy management system controls the second generator to start after a first start delay and synchronize with the first generator;

[0076] When the load is greater than the second start limit, the electric power energy management system controls the third generator to start after a second start delay time.

[0077] In this embodiment, the first start limit refers to the load percentage set according to the system load demand, and the first start delay is the time delay between the system control corresponding generator receiving the instruction and actually starting to generate electric power to supply power to the load. The above parameters can be set according to the characteristics of the platform; no special limitation is made here. To further explain it, the first start limit can be set to X% (X can be a value between 60-90), and the first start delay can be set to N seconds (N can be between 2-20); when the load is greater than X%, the power energy management system controls the second generator to start after N seconds and synchronize with the first generator to share the load. Similarly, the second start limit and the second start delay can also be set according to the needs of the platform. The second start delay is set to be less than the first start delay because the second start limit is higher than the first start limit. In order to protect the generator and extend its service life, the higher the load, the faster the start response of the next generator in the system control sequence, and the optimization of the increase and decrease control between the generator sets, the overall efficiency is higher.

[0078] In this implementation manner, the first startup limit value is 85%, the first startup time delay is 20S, the second startup limit value is 95%, and the second startup time delay is 5S.

[0079] Accordingly, when the load of the generator set decreases, the system also needs to respond in time, disconnect unnecessary generator sets, and reduce the number of online generators. Therefore, as a further preferred solution, the shutdown limit and shutdown delay of the generator are set according to the load of the system distribution board; when the load is less than the shutdown limit, the power energy management system controls the running generator to slow down, disconnect, and shut down after the shutdown delay. For example, after the energy storage battery recovers potential energy again and starts the discharge operation again under the control of the energy storage system, the power energy management system receives the signal of the energy storage control system and makes corresponding control.

[0080] In this embodiment, the shutdown limit and shutdown delay are also set according to demand. The coordination between the start limit, start delay, shutdown limit, and shutdown delay parameters enables the power energy management system to quickly adjust the number of generator sets according to the actual load demand, ensuring that the generators in the system can meet the load demand and balancing the power supply in the system to avoid insufficient load or excessive waste of electric energy. In addition, by responding to load demand in real time, the power energy management system can respond quickly and maintain the power supply stability of the power system. Whether the load increases or decreases sharply, the generator sets can be adjusted quickly to ensure stable power supply of the system and reduce power fluctuations.

[0081] Furthermore, if a running generator in the system fails and the available power is too low, it will also affect the load change of the generator set. Therefore, this setting can also help the system detect the faulty generator in time.

[0082] In summary, the automatic increase and decrease engine function of the present invention can help optimize fuel consumption, reduce fuel costs, improve the efficiency, stability and maintainability of the power system, and reduce operating costs.

[0083] The present invention also provides a control method for an oil-electric hybrid energy control system of an offshore operating platform, comprising the following steps:

[0084] S1: When the operating equipment requests electric energy from the system through the communication interface, the electric energy management system receives a signal from the energy storage control system and issues an instruction. The energy storage control system starts first and controls the energy storage battery to release the stored electric energy to supply power to the operating equipment.

[0085] S2: the SOC of the energy storage battery drops to the lower threshold, the power energy management system receives a signal from the BMS battery management system, and controls the first generator of the start sequence to start;

[0086] S3: The system detects the load of the first generator and makes a control. When the load is greater than the first start limit and less than the second start limit, the power energy management system controls the second generator to start after the first start time delay and synchronize with the first generator; when the load is greater than the second start limit, the power energy management system controls the third generator to start after the second start time delay;

[0087] S4: When the operating equipment completes the operation and the system load drops to less than the first start limit, the power energy management system controls the running second generator and third generator to slow down and disconnect;

[0088] S5: When the load is less than the shutdown limit, the power energy management system controls the running generator to slow down and disconnect, and delay shutdown after the shutdown time.

[0089] The above control method of the present invention gives priority to starting the energy storage battery to meet the power demand of the operating equipment, thereby improving the effective utilization and management efficiency of energy. By automatically increasing or decreasing the number of running generators according to the load size and load changes, the system can flexibly and efficiently respond to the power demand under different working conditions, thereby reducing energy waste. In addition, the start and shutdown limits and start delay are set to achieve rapid response of the system, reduce the lag time of power supply, and improve control efficiency. Overall, higher energy efficiency can be achieved, the operating cost of the offshore platform can be reduced, and the reliability and economic benefits of the offshore wind power installation platform can be improved, which is more in line with the development trend of clean energy development.

[0090] As a further preferred solution, the power energy management system also includes an alarm processing module for detecting a timeout in the start-up of a generator set; after the alarm processing module detects that the generator to be started has not started after the first start-up delay or the second start-up delay, the signal is transmitted to the power energy management system and controls the start-up of the next generator of the generator to be started in the sequence. In this embodiment, the setting of the alarm processing module can automatically adjust and start the next generator to help reduce downtime; when a generator fails to start or fails, the system quickly switches to a backup generator to avoid long-term power outages, which is conducive to ensuring the stability of the platform power system. The platform can deal with unexpected failures or generator start-up problems, reducing the risk of the system being affected.

[0091] It should be noted that, unless otherwise specified, the components involved in the present invention, such as inverters, energy storage batteries, converters, circuit breakers, etc., can be purchased accordingly, as long as they can meet the system usage requirements of the present invention, and there is no limitation on their specific models.

[0092] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. For ordinary technicians in this field, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. An oil-electric hybrid energy control system for an offshore operating platform, the offshore operating platform comprising operating equipment and a generator set for providing energy to the operating equipment; characterized in that: The oil-electric hybrid energy control system includes an energy storage control system for recovering, storing and reusing the braking potential energy of the operating equipment and an electric energy management system for controlling the generator set to provide energy for the operating equipment; both the energy storage control system and the electric energy management system transmit electric energy to the operating equipment through the AC power grid; the offshore operating platform is a self-elevating wind power installation platform, and the operating equipment includes lifting pile legs and lifting equipment; The energy storage control system is used to recover the braking potential energy of the operating equipment, convert it into electrical energy and store it through an energy storage battery; the energy storage battery is connected to the AC power grid of the offshore operating platform through an AC-DC converter, and is connected to the operating equipment to achieve potential energy recovery and storage or supply power to the operating equipment; the energy storage battery is monitored by the BMS battery management system and transmits signals to the system; the energy storage control system receives signals from the BMS battery management system to make judgments and control the charging / discharging of the energy storage battery; when it is necessary to supply power to the operating equipment and the startup conditions of multiple control systems are met, the startup priority of the energy storage control system is higher than that of the electric power management system; The generator set includes at least two generators whose start sequence is set according to the load of the system switchboard, and the power energy management system monitors the load demand of the generator set to control the start / stop of the corresponding generator according to the set generator set sequence; The generator set includes a first generator, a second generator, a third generator, a fourth generator, and a fifth generator according to a system switchboard load start sequence; and the minimum number of online generators is set to 1 according to the start sequence, and when more than two generators are online, the system load is equally divided by all the online generators; Setting the first starting limit, the second starting limit, the first starting delay, and the second starting delay of the generator according to the load of the system switchboard and starting the corresponding generator according to the starting sequence according to the load to increase / decrease the number of running generators; The control method of the oil-electric hybrid energy control system comprises the following steps: S1: When the operating equipment requests electric energy from the system through the communication interface, the energy storage control system is started first to control the energy storage battery to release the stored electric energy to supply power to the operating equipment; S2: The SOC of the energy storage battery drops to a lower threshold, and the power energy management system receives a signal from the BMS battery management system and controls the first generator of the start sequence to start; S3: The system detects the load of the first generator and makes a control. When the load is greater than the first start limit and less than the second start limit, the power energy management system controls the second generator to start after the first start time delay and synchronize with the first generator; when the load is greater than the second start limit, the power energy management system controls the third generator to start after the second start time delay; S4: When the operating equipment completes the operation and the system load drops to less than the first start limit, the power energy management system controls the running second generator and third generator to slow down and disconnect; S5: When the load is less than the shutdown limit, the power energy management system controls the running generator to slow down and disconnect, and delay shutdown after the shutdown time.

2. The oil-electric hybrid energy control system for an offshore operating platform according to claim 1, characterized in that: The BMS battery management system includes an AFE active front-end simulation unit; the energy storage control system receives data on the SOC, pressure, and temperature of the energy storage battery monitored by the BMS battery management system and controls the BMS battery management system and the AFE active front-end simulation unit to coordinately control the charge / discharge management of the energy storage battery, so as to realize the recovery and storage of potential energy, and to supply power to the operating equipment with the electric energy stored in the energy storage battery.

3. The oil-electric hybrid energy control system for an offshore operating platform as claimed in claim 2, characterized in that: The energy storage control system is started to control the energy storage battery to release the stored electric energy to supply power to the working platform until the SOC of the energy storage battery drops to the lower limit threshold. The electric power energy management system receives the signal of the BMS battery management system and controls the generator of the generator set to start.

4. The oil-electric hybrid energy control system for an offshore operating platform according to claim 1, characterized in that: The first start limit is greater than the stop limit and less than the second start limit; the first start time delay is greater than the second start time delay; When the load is less than the first start limit, the electric power energy management system controls the first generator to start after a first start time delay; When the load is greater than the first start limit and less than the second start limit, the power energy management system controls the second generator to start after a first start delay and synchronize with the first generator; When the load is greater than the second start limit, the electric power energy management system controls the third generator to start after a second start delay time.

5. The oil-electric hybrid energy control system for an offshore operating platform as claimed in claim 4, characterized in that: The shutdown limit and shutdown delay of the generator are set according to the load of the system distribution board; when the load is less than the shutdown limit, the power energy management system controls the running generator to slow down and disconnect, and shut down after the shutdown delay.

6. The oil-electric hybrid energy control system for an offshore operating platform according to claim 1, characterized in that: The wind power installation platform is provided with a power supply compartment.

7. The oil-electric hybrid energy control system for an offshore operating platform according to claim 1, characterized in that: The electric power energy management system also includes an alarm processing module for detecting a timeout in starting a generator set; after the alarm processing module detects that the generator to be started has not started after the first start-up delay or the second start-up delay, the signal is transmitted to the electric power energy management system and controls the start-up of the next generator to be started in the sequence.

Images