WO2023005422A1 - 一种离网供电系统及其控制方法 - Google Patents

一种离网供电系统及其控制方法 Download PDF

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Publication number
WO2023005422A1
WO2023005422A1 PCT/CN2022/096852 CN2022096852W WO2023005422A1 WO 2023005422 A1 WO2023005422 A1 WO 2023005422A1 CN 2022096852 W CN2022096852 W CN 2022096852W WO 2023005422 A1 WO2023005422 A1 WO 2023005422A1
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Prior art keywords
energy storage
storage system
hydrogen production
power
hydrogen
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PCT/CN2022/096852
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English (en)
French (fr)
Inventor
孙德亮
周辉
李运生
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阳光新能源开发股份有限公司
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Priority to EP22848032.3A priority Critical patent/EP4379992A1/en
Priority to AU2022316768A priority patent/AU2022316768A1/en
Publication of WO2023005422A1 publication Critical patent/WO2023005422A1/zh

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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/388Islanding, i.e. disconnection of local power supply from the network
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J15/00Systems for storing electric energy
    • H02J15/008Systems for storing electric energy using hydrogen as energy vector
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/28Arrangements for balancing of the load in a network by storage of energy
    • H02J3/32Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381Dispersed generators
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0013Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0013Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
    • H02J7/0025Sequential battery discharge in systems with a plurality of batteries
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0047Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
    • H02J7/0048Detection of remaining charge capacity or state of charge [SOC]
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007Regulation of charging or discharging current or voltage
    • H02J7/00712Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20The dispersed energy generation being of renewable origin
    • H02J2300/22The renewable source being solar energy
    • H02J2300/24The renewable source being solar energy of photovoltaic origin
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy
    • Y02E10/56Power conversion systems, e.g. maximum power point trackers

Definitions

  • the present application relates to the technical field of power supply, in particular to an off-grid power supply system and a control method thereof.
  • Off-grid power supply systems are based on photovoltaic or wind energy and other new energy modes to generate electric energy, and cooperate with energy storage systems, hydrogen production systems, and even electric vehicle charging systems to realize independent electric energy supply networks, and provide stable electric energy for the above-mentioned areas where it is difficult to set up a national backbone power grid Supply plays an important role in actual production and life.
  • the invention provides an off-grid power supply system and a control method thereof, which solves the problems of immature system construction and lack of operation control methods in the prior art, and promotes the popularization and application of the off-grid power supply system.
  • the present invention provides a method for controlling an off-grid power supply system, which is applied to an off-grid power supply system including a plurality of subsystems, and the plurality of subsystems include a first energy storage system and a second energy storage system, the method include:
  • the first target parameter represents the operating state of the first energy storage system
  • the second target parameter represents the operating state of the second energy storage system
  • the preset control strategy includes the power supply priority of each subsystem in the off-grid power supply system
  • the operation of the off-grid power supply system is controlled according to the target control strategy.
  • the first target parameter includes a battery state value of the first energy storage system
  • the second target parameter includes a battery state value of the second energy storage system
  • the multiple preset control strategies include an overcharge control strategy, an undercharge control strategy and a balance control strategy;
  • the determining a target control strategy among multiple preset control strategies according to the first target parameter and the second target parameter includes:
  • both the battery state value of the first energy storage system and the battery state value of the second energy storage system are less than a second battery state threshold, determine that the undercharging control strategy is a target control strategy
  • the balance control strategy is a target control strategy.
  • the multiple subsystems also include a hydrogen production system
  • the controlling the operation of the off-grid power supply system according to the target control strategy includes:
  • the priority of the hydrogen production system is higher than that of the first energy storage system, and the priority of the first energy storage system is higher than that of the second energy storage system.
  • controlling the power supply process of the hydrogen production system, the first energy storage system and the second energy storage system in descending order of priority includes:
  • If the hydrogen production power can be increased, increase the hydrogen production power and reduce the charging power of the first energy storage system and the second energy storage system;
  • the judging whether the hydrogen production power of the hydrogen production system can be increased includes:
  • the hydrogen storage is greater than or equal to the first hydrogen storage threshold
  • the current hydrogen production power is greater than or equal to the hydrogen production power threshold, and it is determined that the hydrogen production power of the hydrogen production system cannot be increased;
  • the third battery state threshold is greater than the first battery state threshold.
  • the increasing the hydrogen production power and reducing the charging power of the first energy storage system and the second energy storage system includes:
  • the multiple subsystems also include a power generation system, and the method further includes:
  • the hydrogen production system is controlled to stop running.
  • the increasing the charging power of the first energy storage system or the second energy storage system includes:
  • the charging power of the first energy storage system can be increased, increasing the charging power of the first energy storage system and reducing the charging power of the second energy storage system;
  • the charging power of the second energy storage system can be increased, increase the charging power of the second energy storage system.
  • the judging whether the charging power of the first energy storage system can be increased includes:
  • the battery state value of the first energy storage system is less than the third battery state threshold, and the current charging power of the first energy storage system is less than the charging power threshold, it is determined that the first energy storage system can be increased charging power;
  • the battery state value of the first energy storage system is greater than or equal to the third battery state threshold, or the current charging power of the first energy storage system is greater than or equal to the charging power threshold, it is determined that the Charging power of the first energy storage system.
  • the multiple subsystems also include a hydrogen production system
  • the controlling the operation of the off-grid power supply system according to the target control strategy includes:
  • the priority of the hydrogen production system is higher than that of the first energy storage system and the second energy storage system, and the priority of the first energy storage system and the second energy storage system are the same .
  • controlling the power supply process of the hydrogen production system, the first energy storage system and the second energy storage system in descending order of priority includes:
  • the hydrogen production power can be increased, increase the hydrogen production power of the hydrogen production system and reduce the charging power of the first energy storage system and the second energy storage system;
  • the first energy storage system and the second energy storage system are controlled to be alternately charged according to a preset charging interval.
  • the judging whether the hydrogen production power of the hydrogen production system can be increased includes:
  • the hydrogen storage of the hydrogen production system is less than the second hydrogen storage threshold and the current hydrogen production power of the hydrogen production system is less than the hydrogen production power threshold, it is determined that the hydrogen production power of the hydrogen production system can be increased;
  • the hydrogen storage of the hydrogen production system is greater than or equal to the first hydrogen storage threshold or the current hydrogen production power of the hydrogen production system reaches the hydrogen production power threshold, it is determined that the hydrogen production power of the hydrogen production system cannot be increased;
  • the second hydrogen storage threshold is smaller than the first hydrogen storage threshold.
  • increasing the hydrogen production power of the hydrogen production system and reducing the charging power of the first energy storage system and the second energy storage system includes:
  • controlling alternate charging of the first energy storage system and the second energy storage system according to a preset charging interval includes:
  • the charging power of the energy storage system in the charging state is the same as the hydrogen production power of the hydrogen production system.
  • controlling the alternate discharge of the first energy storage system and the second energy storage system according to a preset discharge interval includes:
  • the hydrogen storage of the hydrogen production system is greater than the second hydrogen storage threshold, reduce the hydrogen production power of the hydrogen production system to zero, and control the first energy storage system and the second energy storage system according to the preset discharge interval Alternate discharge of the energy system;
  • the hydrogen storage of the hydrogen production system is less than or equal to the second hydrogen storage threshold and greater than or equal to the third hydrogen storage threshold, reduce the hydrogen production power of the hydrogen production system according to a preset ratio, and control according to a preset discharge interval
  • the first energy storage system and the second energy storage system are alternately discharged
  • hydrogen storage capacity of the hydrogen production system is less than the third hydrogen storage threshold, reduce the discharge power of the first energy storage system and the second energy storage system to zero, and reduce the production capacity of the hydrogen production system.
  • the third hydrogen storage threshold is smaller than the second hydrogen storage threshold, and the preset ratio is greater than zero.
  • the multiple subsystems also include a hydrogen production system and a charging system;
  • the controlling the operation of the off-grid power supply system according to the target control strategy includes:
  • the priority of the first energy storage system and the second energy storage system is higher than that of the hydrogen production system, and the priority of the hydrogen production system is higher than that of the charging system.
  • controlling the power supply process of the hydrogen production system, the first energy storage system, the second energy storage system and the charging system in descending order of priority includes:
  • the hydrogen storage of the hydrogen production system is less than the third hydrogen storage threshold, and the battery state value of the first energy storage system and the battery state value of the second energy storage system are both less than the fourth battery state threshold, controlling the shutdown of the hydrogen production system and the charging system;
  • the first energy storage system and the second energy storage system are charged according to the total generated power.
  • the present invention provides an off-grid power supply system, including: a power generation system, a hydrogen production system, a charging system, a first energy storage system, a second energy storage system, a DC bus, an AC bus and a controller, wherein,
  • the output end of the power generation system is connected to the DC bus;
  • the DC input terminal of the hydrogen production system, the DC connection terminal of the first energy storage system, and the DC connection terminal of the second energy storage system are respectively connected to the DC bus;
  • the AC connection end of the first energy storage system is connected to the AC bus
  • the AC input end of the hydrogen production system and the charging system are respectively connected to the AC bus;
  • the controller is respectively connected with the power generation system, the hydrogen production system, the charging system, the first energy storage system, and the second energy storage system;
  • the controller executes the off-grid power supply system control method described in any one of the first aspect of the present invention.
  • the power generation system includes a photovoltaic power generation system.
  • the target control strategy is determined among multiple preset control strategies, and finally according to The target control strategy controls the operation of the off-grid power supply system.
  • the method provided by the present invention provides multiple preset control strategies for the off-grid power supply system, and each preset control strategy defines the power supply priority of each subsystem in the off-grid power supply system, which can satisfy The different power supply requirements of the off-grid power supply system can more accurately control the operation of the off-grid power supply system, solve the problem of lack of control methods in the prior art, and help promote the popularization and application of the off-grid power supply system.
  • Fig. 1 is a structural block diagram of an off-grid power supply system provided by an embodiment of the present invention
  • Fig. 2 is a flowchart of an off-grid power supply system control method provided by an embodiment of the present invention
  • Fig. 3 is a flow chart of another off-grid power supply system control method provided by an embodiment of the present invention.
  • Fig. 4 is a flowchart of another off-grid power supply system control method provided by an embodiment of the present invention.
  • Fig. 5 is a flowchart of another off-grid power supply system control method provided by an embodiment of the present invention.
  • Fig. 6 is a flow chart of another off-grid power supply system control method provided by an embodiment of the present invention.
  • Fig. 1 is a structural block diagram of an off-grid power supply system provided by an embodiment of the present invention.
  • the off-grid power supply system provided by this embodiment includes: a power generation system, a hydrogen production system, a charging system, a first energy storage system, The second energy storage system, DC bus, AC bus and controller (not shown in the figure), wherein,
  • the output end of the power generation system is connected to the DC bus as the main power source of the off-grid power supply system.
  • the power generation system can use a photovoltaic power generation system. system. After the power generation system generates electric energy, it is directly output to the DC bus.
  • the DC input terminal of the hydrogen production system, the DC connection terminal of the first energy storage system, and the DC connection terminal of the second energy storage system are respectively connected to the DC bus.
  • the hydrogen production system can directly obtain electricity from the DC bus for hydrogen production operations.
  • the first energy storage system and the second energy storage system can take power from the DC bus for charging operations, and can also output power to the DC bus to supplement the insufficient power supply of the power generation system.
  • the AC connection terminal of the first energy storage system It is also connected to the AC bus and outputs electric energy to the AC bus.
  • the first energy storage system is mainly used for power supply
  • the second energy storage system is mainly used for stabilizing the bus voltage.
  • the AC input terminal of the hydrogen production system and the charging system are respectively connected to the AC bus. It should be noted that the AC power received by the AC input terminal of the hydrogen production system is not used for hydrogen production operations, but is mainly used for the operation of auxiliary systems of the hydrogen production system, such as cooling water circulation, air compressor operation and AC power distribution cabinets Power supply of other equipment.
  • each constituent system must be equipped with corresponding power conversion devices, such as DC/DC converters, DC/AC converters, etc., which are not included in this embodiment. To list them one by one, they can be implemented in combination with existing technologies in practical applications.
  • the controller is respectively connected with the power generation system, the hydrogen production system, the charging system, the first energy storage system and the second energy storage system, and the controller executes the off-grid power supply system control method provided by the following embodiments of the present invention to The operation process of the power supply system is controlled.
  • an embodiment of the present invention provides a control method for the off-grid power supply system.
  • the control method can be applied to the controller in the system, and in some cases, can also be applied to the On the network side, a server capable of controlling the operation process of each constituent system in the off-grid power supply system.
  • a server capable of controlling the operation process of each constituent system in the off-grid power supply system.
  • the first target parameter is used to characterize the operating state of the first energy storage system
  • the second target parameter is used to characterize the operating state of the second energy storage system.
  • the first target parameter may be the battery state value of the first energy storage system
  • the second target parameter may be the battery state value of the second energy storage system.
  • the SOC value or the SOH value can be selected, which can be flexibly selected according to the specific control process, which also belongs to the protection scope of the present invention.
  • this method provides a variety of preset control strategies, mainly including overcharge control strategies, undercharge control strategies and balance control strategies. Any preset control strategy limits the off-grid
  • the power supply priority of each subsystem in the power supply system It is conceivable that the subsystems mentioned in this embodiment and subsequent embodiments mainly include the power generation system, the hydrogen production system, the first energy storage system, the second energy storage system and the charging system shown in FIG. 1 .
  • the first target parameter is the battery state value of the first energy storage system and the second target parameter is the battery state value of the second energy storage system
  • the battery state threshold is the SOC threshold
  • the battery state threshold is the SOH threshold
  • the overcharge control strategy is determined as the target control strategy.
  • the first SOC threshold can be set higher, such as 70%.
  • the first energy storage system and the second energy storage system have sufficient power, and charging the energy storage system is naturally not a priority.
  • this embodiment defines the control strategy in this case as an overcharge control strategy.
  • the control strategy in this case is defined as an undercharging control strategy.
  • the balance control strategy is the target control strategy.
  • the control is carried out in combination with the specific conditions of each subsystem in the power supply system.
  • the control strategy in this case is defined as a balance control strategy.
  • the specific setting of the first battery state threshold and the second battery state threshold can be set in combination with specific control requirements and actual conditions of the energy storage system, which is not specifically limited in the present invention.
  • the operation of the power supply system can be controlled according to the power supply priority of each subsystem defined in the target control strategy.
  • the off-grid power supply system control method provides multiple preset control strategies for the off-grid power supply system, and each preset control strategy defines the power supply priority of each subsystem in the off-grid power supply system , can meet the different power supply requirements of the off-grid power supply system, more accurately control the operation of the off-grid power supply system, solve the problem of lack of control methods in the prior art, and is conducive to promoting the popularization and application of the off-grid power supply system.
  • the following describes the specific process of controlling the operation of the off-grid power supply system according to the target control strategy for different preset control strategies.
  • the process of controlling the operation of the off-grid power supply system can be implemented as shown in FIG. 3 .
  • the total power generated by the off-grid power supply system refers to the total power output by the power generation system in the off-grid power supply system, although the first energy storage system and the second energy storage system can also output power to supply power loads
  • the total power generated by the off-grid power supply system does not include the output power of the first energy storage system and the second energy storage system.
  • the total power consumption includes the systems and equipment that consume electric power for the off-grid power supply system, as shown in Figure 1, including the power consumption of the hydrogen production system, the first energy storage system, the second energy storage system, and the charging system.
  • the priority of the hydrogen production system is higher than that of the first energy storage system, and the priority of the first energy storage system is higher than that of the second energy storage system; on the contrary, if If the total power generated by the grid power generation system is less than or equal to the total power consumption, the current operating state of the system will be maintained.
  • the hydrogen storage volume of the hydrogen production system is less than the first hydrogen storage volume threshold, and the hydrogen production system’s If the current hydrogen production power is less than the hydrogen production power threshold, it is determined that the hydrogen production power of the hydrogen production system can be increased;
  • the battery state value of the first energy storage system and the battery state value of the second energy storage system are both greater than or equal to the third battery state threshold, or the hydrogen storage is greater than or equal to the first hydrogen storage threshold, or the current hydrogen production power is greater than It is equal to the hydrogen production power threshold, and it is determined that the hydrogen production power of the hydrogen production system cannot be increased.
  • the third battery state threshold in the above-mentioned judging criteria is greater than the first battery state threshold mentioned in the foregoing embodiment, in practical applications, it can be selected higher, still taking the SOC value as an example, for example, it can be set to 98%, Of course, if you want to reserve more safety space for the energy storage system, you can also correspondingly lower the selection of the third SOC threshold, for example, set it to 90%.
  • the main purpose of setting the third SOC threshold is to judge whether the energy storage system is at or close to full capacity and can absorb more electric power. Under this premise, the third SOC threshold selected in combination with the actual operation of the energy storage system is Optionally, the present invention does not specifically limit the specific value of the third SOC threshold.
  • the first hydrogen storage threshold a larger value should be selected for the first hydrogen storage threshold to measure or limit whether further hydrogen production operations can be carried out. For example, 98% of the overall capacity of the hydrogen storage device can be taken as the first hydrogen storage threshold.
  • the hydrogen production power threshold can be determined based on the maximum hydrogen production power or the rated hydrogen production power threshold of the hydrogen production system to measure whether the hydrogen production power can be further increased. The present invention does not limit the specific values of the first hydrogen storage threshold and the hydrogen production power threshold.
  • the hydrogen production power threshold or the charging power of the first energy storage system and the second energy storage system is reduced to zero, that is, all the power is used for hydrogen production, so as to achieve the purpose of using electric energy for hydrogen production as much as possible and improving the efficiency of hydrogen production
  • the power supply priority of the hydrogen production system is higher than that of the first energy storage system and the second energy storage system.
  • the hydrogen production power cannot be further increased, increase the charging power of the first energy storage system or the second energy storage system, and store the electric energy of the power generation system as much as possible, so that it can be used when the subsequent power generation system cannot provide enough power .
  • FIG. 4 the flowchart shown in FIG. 4 shows an optional execution process of this step.
  • the battery state value of the first energy storage system is less than the aforementioned third battery state threshold, that is, it is possible to further store electric energy
  • the current charging power of the first energy storage system is less than the charging power threshold, that is, it can also be
  • the charging power is further increased, it is determined that the charging power of the first energy storage system can be increased; on the contrary, if the battery state value of the first energy storage system is greater than or equal to the third battery state threshold, or the current charging power of the first energy storage system If the power is greater than or equal to the charging power threshold, it is determined that the charging power of the first energy storage system cannot be increased.
  • the setting of the charging power threshold depends on the specific energy storage system used, and the present invention does not limit the specific setting of the charging power threshold.
  • the charging power of the first energy storage system can be further increased, the charging power of the first energy storage system can be increased, and the charging power of the second energy storage system can be reduced at the same time. until the charging power of the first energy storage system reaches the aforementioned charging power threshold or the charging power of the second energy storage system drops to zero, so that the first energy storage system is charged with the maximum charging power.
  • the judgment logic of this step is similar to that of S300, that is, if the battery state value of the second energy storage system is less than the aforementioned third battery state threshold, and the current charging power of the second energy storage system is less than the charging power threshold, Then it is determined that the charging power of the second energy storage system can be increased; on the contrary, if the battery state value of the second energy storage system is greater than or equal to the third battery state threshold, or the current charging power of the second energy storage system is greater than or equal to the charging power Threshold, it is determined that the charging power of the second energy storage system cannot be increased.
  • the charging power of the second energy storage system cannot be further increased, that is, the battery state value of the first energy storage system and the charging power of the second energy storage system
  • the battery status values are all greater than or equal to the third battery status threshold, indicating that the output power of the power generation system cannot be further absorbed. In this case, the output power of the power generation system should be reduced to ensure the stable operation of the system.
  • the hydrogen production system is controlled to stop running.
  • the priority of the hydrogen production system is the highest, the priority of the first energy storage system is second, and the priority of the second energy storage system is the lowest, according to the priority from high to low
  • the sequence controls the operation of the off-grid power supply system, prioritizing the use of electric energy for hydrogen production, which helps to improve the utilization rate of electric energy.
  • the process of controlling the operation of the off-grid power supply system can be implemented as shown in FIG. 5 .
  • the hydrogen storage of the hydrogen production system is less than the second hydrogen storage threshold and the current hydrogen production power of the hydrogen production system is less than the hydrogen production power threshold, it is determined that the hydrogen production power of the hydrogen production system can be increased; on the contrary, if If the hydrogen storage of the hydrogen system is greater than or equal to the first hydrogen storage threshold or the current hydrogen production power of the hydrogen production system reaches the hydrogen production power threshold, it is determined that the hydrogen production power of the hydrogen production system cannot be increased.
  • the second hydrogen storage threshold mentioned in this embodiment is smaller than the first hydrogen storage threshold mentioned in the previous embodiment, for example, 70% of the total amount of hydrogen that can be stored in the hydrogen production system can be taken as Second hydrogen storage threshold.
  • the hydrogen production power threshold it needs to be set in combination with the specific parameters of the hydrogen production system. The present invention does not limit the specific values of the first hydrogen storage threshold and the hydrogen production power threshold.
  • the hydrogen production power of the hydrogen production system can be increased, increase the hydrogen production power of the hydrogen production system, and at the same time reduce the charging power of the first energy storage system and the second energy storage system until the hydrogen production power reaches the hydrogen production capacity.
  • the power threshold or the charging power of the first energy storage system and the second energy storage system is reduced to zero, that is, the priority is to ensure the electricity consumption of the hydrogen production system, and the normal operation of the hydrogen production system is the highest priority.
  • the first energy storage system and the second energy storage system are controlled to charge alternately according to a preset charging interval.
  • a further judgment can be made based on the hydrogen storage of the hydrogen production system. If the hydrogen storage of the hydrogen production system is greater than or equal to the aforementioned first hydrogen storage threshold, it can be determined that the hydrogen storage is close to saturation. At this time, the hydrogen production system can be controlled to shut down.
  • the first energy storage system and the second energy storage system control the first energy storage system and the second energy storage system to charge alternately according to the preset charging interval; correspondingly, if the hydrogen storage capacity of the hydrogen production system is greater than or equal to the second hydrogen storage threshold and less than the first hydrogen storage threshold, then maintain hydrogen production
  • the current hydrogen production power of the system continues to produce hydrogen, and at the same time controls the first energy storage system and the second energy storage system to alternately charge according to the preset charging interval, and the energy storage system (which can be the first energy storage system, It can also be the charging power of the second energy storage system) is the same as the hydrogen production power of the hydrogen production system.
  • the first energy storage system and the second energy storage system are controlled to charge alternately according to the preset charging interval, and any one of the first energy storage system and the second energy storage system can be selected as the target energy storage system.
  • control the target energy storage system to charge according to the preset charging interval.
  • stop charging the target energy storage system and turn to charge another energy storage system other than the target energy storage system according to the preset charging interval.
  • Charging is performed at preset charging intervals, so that the first energy storage system and the second energy storage system are charged respectively.
  • the total power of the power generation system is less than the total power of electricity consumption, in order to ensure the stability of the whole system, it is necessary to reduce the hydrogen production power of the hydrogen production system, give priority to reducing the consumption of electric energy by the hydrogen production system, so that more electric power can be used for power supply load, thus ensuring the normal operation of the electric load.
  • this embodiment further sets the second hydrogen storage threshold and the third hydrogen storage threshold on the basis of the aforementioned first hydrogen storage threshold threshold, and the second hydrogen storage threshold is less than the aforementioned first hydrogen storage threshold, the third hydrogen storage threshold is less than the second hydrogen storage threshold, for example, the second hydrogen storage threshold can be 70% of the total storage, and the third hydrogen storage threshold can be It is 30% of the total reserves.
  • the hydrogen storage of the hydrogen production system is greater than the second hydrogen storage threshold, if the hydrogen storage of the hydrogen production system is greater than the second hydrogen storage threshold, the hydrogen production power of the hydrogen production system is directly reduced to zero, and The first energy storage system and the second energy storage system are controlled to discharge alternately according to a preset discharge interval.
  • the hydrogen production power of the hydrogen production system is reduced according to a preset ratio, that is, it is not directly reduced to zero, but relatively The smaller hydrogen production power continues to produce hydrogen, and at the same time, the first energy storage system and the second energy storage system are controlled to discharge alternately according to the preset discharge interval.
  • the hydrogen storage of the hydrogen production system is less than the third hydrogen storage threshold, reduce the discharge power of the first energy storage system and the second energy storage system to zero, and reduce the hydrogen production power of the hydrogen production system.
  • the process of controlling the alternate discharge of the first energy storage system and the second energy storage system according to the preset discharge interval is the same as the aforementioned control of the first energy storage system and the second energy storage system according to the preset charging interval.
  • the process of alternate charging is similar. Specifically, any one of the first energy storage system and the second energy storage system can be selected as the target energy storage system.
  • the target energy storage system is controlled to discharge according to the preset discharge interval, and the discharge time reaches the preset discharge interval. After the interval, stop discharging the target energy storage system, and turn to discharge another energy storage system other than the target energy storage system according to the preset discharge interval, so that the first energy storage system and the second energy storage system are respectively discharged discharge.
  • the current operating state of the off-grid power supply system is maintained.
  • the balance control strategy when using the balance control strategy to control the off-grid power supply system, it is also necessary to control the power supply process of the hydrogen production system, the first energy storage system and the second energy storage system in order of priority from high to low.
  • the priority of the hydrogen production system is higher than that of the first energy storage system and the second energy storage system, and the priority of the first energy storage system and the second energy storage system is the same, and the priority of the second energy storage system can be The first energy storage system and the second energy storage system perform charge and discharge control.
  • the process of controlling the operation of the off-grid power supply system can be implemented as shown in FIG. 6 .
  • the hydrogen production load is a special electricity load, in the process of reducing the electricity load, the hydrogen production power should be reduced first, that is, the hydrogen production load should be reduced, and then other electricity loads connected to the system should be gradually reduced.
  • the priority is to control the shutdown of the charging system to reduce the total amount of power consumption, and at the same time, gradually reduce the hydrogen production power of the hydrogen production system until the hydrogen production power is reduced to zero value.
  • the hydrogen storage of the hydrogen production system is greater than or equal to the third hydrogen storage threshold
  • the relationship between the battery state value of the first energy storage system, the battery state value of the second energy storage system and the fourth battery state threshold is further judged.
  • the fourth battery state threshold needs to take a smaller value, which is smaller than any of the aforementioned battery state thresholds, for example, it can be 2%. If the battery state value of the energy storage system is less than the fourth battery The status threshold indicates that the power of the energy storage system is already very low, so continue to charge.
  • the battery state value of at least one of the first energy storage system and the second energy storage system is greater than the fourth battery state threshold, increase the discharge power of the energy storage system whose battery state value is greater than the fourth battery state threshold.
  • S550 Control the shutdown of the hydrogen production system and the charging system, and charge the first energy storage system and the second energy storage system according to the total power generated.
  • the hydrogen production system and the charging system are controlled to shut down , charge the first energy storage system and the second energy storage system according to the total power generated, that is, use all the power of the power generation system to charge the energy storage system.
  • the power supply process of the hydrogen production system, the first energy storage system, the second energy storage system and the charging system is also controlled in order of priority from high to low, but , different from the foregoing embodiments, in this embodiment, the priority of the first energy storage system and the second energy storage system is higher than that of the hydrogen production system, and the priority of the hydrogen production system is higher than that of the charging system.
  • the control method provided by the present invention for the off-grid power supply system including two energy storage systems can not only meet the different power supply requirements of the off-grid power supply system, but also provide The operation of the system can be controlled more accurately, and the problem of lack of control methods in the prior art is solved. Further, through the separate control of the first energy storage system and the second energy storage system, the first energy storage system and the second energy storage system The energy systems play different functions.
  • the first energy storage system is mainly used to supply power to the load, so in the charging and discharging control process, the priority of the first energy storage system is higher than that of the second energy storage system, and the second energy storage system
  • the main user of the energy system is to stabilize the voltage of the DC bus. During the control process, it is enough to maintain the SOC of the second energy storage system to a reasonable range and stabilize the output voltage. Therefore, its priority is low.
  • each embodiment of the present invention is described in a progressive manner, each embodiment focuses on the differences from other embodiments, and the same and similar parts of the various embodiments can be referred to each other.
  • the description is relatively simple, and for the related part, please refer to the description of the method part.

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Abstract

本申请提供的离网供电系统及其控制方法,应用于供电技术领域,该方法在获取第一目标参数和第二目标参数后,根据第一目标参数和第二目标参数,在多个预设控制策略中确定目标控制策略,最终按照目标控制策略控制离网供电系统运行,本发明提供的方法针对离网供电系统提供多个预设控制策略,且各预设控制策略定义离网供电系统中各子系统的供电优先级,能够满足离网供电系统的不同供电需求,对离网供电系统的运行进行更为准确的控制,解决现有技术中缺乏控制方法的问题,有利于促进离网供电系统的推广应用。

Description

一种离网供电系统及其控制方法
本申请要求于2021年07月28日提交中国专利局、申请号为202110857549.2、发明名称为“一种离网供电系统及其控制方法”的中国专利申请的优先权,其全部内容通过引用结合在本申请中。
技术领域
本申请涉及供电技术领域,特别涉及一种离网供电系统及其控制方法。
背景技术
在高原、山地以及孤岛等国家主干电网不易架设到的地区,基于新能源发电系统、储能系统等技术实现的供电系统成为供电首选,由于这类供电系统未与国家主干电网建立电气连接,因此被称之为离网供电系统。
离网供电系统大都基于光伏或风能等新能源模式产生电能,配合储能系统、制氢系统,甚至电动汽车充电系统实现独立的电能供应网络,为上述不易架设国家主干电网的地区提供稳定的电能供应,在实际生产、生活中具有重要作用。
然而,由于离网供电系统的构建尚不够成熟,缺乏行之有效的运行控制方法,不利于离网供电系统的推广应用。
发明内容
本发明提供一种离网供电系统及其控制方法,解决现有技术中系统构建不成熟,缺乏运行控制方法的问题,促进离网供电系统的推广应用。
为实现上述目的,本发明提供的技术方案如下:
第一方面,本发明提供一种离网供电系统控制方法,应用于包括多个子系统的离网供电系统,且所述多个子系统包括第一储能系统和第二储能系统,所述方法包括:
获取第一目标参数和第二目标参数;
其中,所述第一目标参数表征所述第一储能系统的运行状态,所述第二目标参数表征所述第二储能系统的运行状态;
根据所述第一目标参数和所述第二目标参数,在多个预设控制策略中确定目标控制策略;
其中,所述预设控制策略包括所述离网供电系统中各子系统的供电优先 级;
按照所述目标控制策略控制所述离网供电系统运行。
可选的,所述第一目标参数包括所述第一储能系统的电池状态值,所述第二目标参数包括所述第二储能系统的电池状态值;
所述多个预设控制策略包括过充控制策略、欠充控制策略和平衡控制策略;
所述根据所述第一目标参数和所述第二目标参数,在多个预设控制策略中确定目标控制策略,包括:
若所述第一储能系统的电池状态值和所述第二储能系统的电池状态值均大于第一电池状态阈值,确定所述过充控制策略为目标控制策略;
若所述第一储能系统的电池状态值和所述第二储能系统的电池状态值均小于第二电池状态阈值,确定所述欠充控制策略为目标控制策略;
若所述第一储能系统的电池状态值和所述第二储能系统的电池状态值中的至少一个,大于等于所述第二电池状态阈值且小于等于所述第一电池状态阈值,确定所述平衡控制策略为目标控制策略。
可选的,所述多个子系统还包括制氢系统;
在所述过充控制策略为目标控制策略情况下,所述按照所述目标控制策略控制所述离网供电系统运行,包括:
获取所述离网供电系统的发电总功率和用电总功率;
若所述发电总功率大于所述用电总功率,按照优先级由高到低的顺序控制所述制氢系统、所述第一储能系统和所述第二储能系统的供电过程;
其中,所述制氢系统的优先级高于所述第一储能系统的优先级,所述第一储能系统的优先级高于所述第二储能系统的优先级。
可选的,所述按照优先级由高到低的顺序控制所述制氢系统、所述第一储能系统和所述第二储能系统的供电过程,包括:
判断是否可以增大所述制氢系统的制氢功率;
若可以增大所述制氢功率,增大所述制氢功率并降低所述第一储能系统和所述第二储能系统的充电功率;
若不可以增大所述制氢功率,增大所述第一储能系统或所述第二储能系统 的充电功率。
可选的,所述判断是否可以增大所述制氢系统的制氢功率,包括:
若所述第一储能系统的电池状态值和所述第二储能系统的电池状态值中的至少一个小于第三电池状态阈值,
且所述制氢系统的氢气储量小于第一氢储量阈值,
且所述制氢系统的当前制氢功率小于制氢功率阈值,判定可以增大所述制氢系统的制氢功率;
若所述第一储能系统的电池状态值和所述第二储能系统的电池状态值均大于等于所述第三电池状态阈值,
或者,所述氢气储量大于等于所述第一氢储量阈值,
或者,所述当前制氢功率大于等于所述制氢功率阈值,判定不可以增大所述制氢系统的制氢功率;
其中,所述第三电池状态阈值大于所述第一电池状态阈值。
可选的,所述增大所述制氢功率并降低所述第一储能系统和所述第二储能系统的充电功率,包括:
增大所述制氢功率并降低所述第一储能系统和所述第二储能系统的充电功率,直至所述制氢功率达到所述制氢功率阈值或者所述第一储能系统和所述第二储能系统的充电功率降为零值。
可选的,所述多个子系统还包括发电系统,所述方法还包括:
在所述第一储能系统的电池状态值和所述第二储能系统的电池状态值均大于等于所述第三电池状态阈值的情况下,降低所述发电系统的发电功率;
在所述氢气储量大于等于所述第一氢储量阈值的情况下,控制所述制氢系统停止运行。
可选的,所述增大所述第一储能系统或所述第二储能系统的充电功率,包括:
判断是否可以增大所述第一储能系统的充电功率;
若可以增大所述第一储能系统的充电功率,增大所述第一储能系统的充电功率并降低所述第二储能系统的充电功率;
若不可以增大所述第一储能系统的充电功率,判断是否可以增大所述第二 储能系统的充电功率;
若可以增大所述第二储能系统的充电功率,增大所述第二储能系统的充电功率。
可选的,所述判断是否可以增大所述第一储能系统的充电功率,包括:
若所述第一储能系统的电池状态值小于所述第三电池状态阈值,且所述第一储能系统的当前充电功率小于充电功率阈值,判定可以增大所述第一储能系统的充电功率;
若所述第一储能系统的电池状态值大于等于所述第三电池状态阈值,或者,所述第一储能系统的当前充电功率大于等于所述充电功率阈值,判定不可以增大所述第一储能系统的充电功率。
可选的,所述多个子系统还包括制氢系统;
在所述平衡控制策略为目标控制策略情况下,所述按照所述目标控制策略控制所述离网供电系统运行,包括:
获取所述离网供电系统的发电总功率和用电总功率;
若所述发电总功率大于所述用电总功率,按照优先级由高到低的顺序控制所述制氢系统、所述第一储能系统和所述第二储能系统的供电过程;
其中,所述制氢系统的优先级高于所述第一储能系统和所述第二储能系统的优先级,所述第一储能系统和所述第二储能系统的优先级相同。
可选的,所述按照优先级由高到低的顺序控制所述制氢系统、所述第一储能系统和所述第二储能系统的供电过程,包括:
判断是否可以增大所述制氢系统的制氢功率;
若可以增大所述制氢功率,增大所述制氢系统的制氢功率并降低所述第一储能系统和所述第二储能系统的充电功率;
若不可以增大所述制氢功率,按照预设充电间隔控制所述第一储能系统和所述第二储能系统交替充电。
可选的,所述判断是否可以增大所述制氢系统的制氢功率,包括:
若所述制氢系统的氢气储量小于第二氢储量阈值且所述制氢系统的当前制氢功率小于制氢功率阈值,判定可以增大所述制氢系统的制氢功率;
若所述制氢系统的氢气储量大于等于第一氢储量阈值或所述制氢系统的 当前制氢功率达到所述制氢功率阈值,判定不可以增大所述制氢系统的制氢功率;
其中,所述第二氢储量阈值小于所述第一氢储量阈值。
可选的,所述增大所述制氢系统的制氢功率并降低所述第一储能系统和所述第二储能系统的充电功率,包括:
增大所述制氢系统的制氢功率并降低所述第一储能系统和所述第二储能系统的充电功率,直至所述制氢功率达到所述制氢功率阈值或者所述第一储能系统和所述第二储能系统的充电功率降为零值。
可选的,所述按照预设充电间隔控制所述第一储能系统和所述第二储能系统交替充电,包括:
若所述制氢系统的氢气储量大于等于所述第一氢储量阈值,控制所述制氢系统停机,并按照预设充电间隔控制所述第一储能系统和所述第二储能系统交替充电;
若所述制氢系统的氢气储量大于等于所述第二氢储量阈值且小于所述第一氢储量阈值,按照预设充电间隔控制所述第一储能系统和所述第二储能系统交替充电;
并且,处于充电状态的储能系统的充电功率与所述制氢系统的制氢功率相同。
可选的,若所述发电总功率小于所述用电总功率,降低所述制氢系统的制氢功率;
按照预设放电间隔控制所述第一储能系统和所述第二储能系统交替放电;
若所述发电总功率等于所述用电总功率,维持所述离网供电系统的当前运行状态。
可选的,所述按照预设放电间隔控制所述第一储能系统和所述第二储能系统交替放电,包括:
若所述制氢系统的氢气储量大于第二氢储量阈值,降低所述制氢系统的制氢功率至零值,并按照预设放电间隔控制所述第一储能系统和所述第二储能系统交替放电;
若所述制氢系统的氢气储量小于等于所述第二氢储量阈值,且大于等于第 三氢储量阈值,按照预设比例降低所述制氢系统的制氢功率,并按照预设放电间隔控制所述第一储能系统和所述第二储能系统交替放电;
若所述制氢系统的氢气储量小于所述第三氢储量阈值,降低所述第一储能系统和所述第二储能系统的放电功率至零值,并降低所述制氢系统的制氢功率;
其中,所述第三氢储量阈值小于所述第二氢储量阈值,所述预设比例大于零。
可选的,所述多个子系统还包括制氢系统和充电系统;
在所述欠充控制策略为目标控制策略情况下,所述按照所述目标控制策略控制所述离网供电系统运行,包括:
获取所述离网供电系统的发电总功率和用电总功率;
若所述发电总功率大于所述用电总功率,按照优先级由高到低的顺序控制所述制氢系统、所述第一储能系统、所述第二储能系统和所述充电系统的供电过程;
其中,所述第一储能系统和所述第二储能系统的优先级高于所述制氢系统的优先级,所述制氢系统的优先级高于所述充电系统的优先级。
可选的,所述按照优先级由高到低的顺序控制所述制氢系统、所述第一储能系统、所述第二储能系统和所述充电系统的供电过程,包括:
若所述制氢系统的氢气储量大于等于第三氢储量阈值,控制所述充电系统停机;
降低所述制氢系统的制氢功率;
若所述制氢系统的氢气储量小于所述第三氢储量阈值,且所述第一储能系统的电池状态值和所述第二储能系统的电池状态值均小于第四电池状态阈值,控制所述制氢系统和所述充电系统停机;
按照所述发电总功率对所述第一储能系统和所述第二储能系统充电。
第二方面,本发明提供一种离网供电系统,包括:发电系统、制氢系统、充电系统、第一储能系统、第二储能系统、直流母线、交流母线和控制器,其中,
所述发电系统的输出端与所述直流母线相连;
所述制氢系统的直流输入端、所述第一储能系统的直流连接端、所述第二储能系统的直流连接端分别与所述直流母线相连;
所述第一储能系统的交流连接端与所述交流母线相连;
所述制氢系统的交流输入端和所述充电系统分别与所述交流母线相连;
所述控制器分别与所述发电系统、所述制氢系统、所述充电系统、所述第一储能系统、所述第二储能系统相连;
所述控制器执行本发明第一方面任一项所述的离网供电系统控制方法。
可选的,所述发电系统包括光伏发电系统。
本发明提供的离网供电系统控制方法,在获取第一目标参数和第二目标参数后,根据第一目标参数和第二目标参数,在多个预设控制策略中确定目标控制策略,最终按照目标控制策略控制离网供电系统运行,本发明提供的方法针对离网供电系统提供多个预设控制策略,且各预设控制策略定义离网供电系统中各子系统的供电优先级,能够满足离网供电系统的不同供电需求,对离网供电系统的运行进行更为准确的控制,解决现有技术中缺乏控制方法的问题,有利于促进离网供电系统的推广应用。
附图说明
为了更清楚地说明本申请实施例或现有技术中的技术方案,下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍,显而易见地,下面描述中的附图仅仅是本申请的一些实施例,对于本领域普通技术人员来讲,在不付出创造性劳动的前提下,还可以根据这些附图示出的结构获得其他的附图。
图1是本发明实施例提供的一种离网供电系统的结构框图;
图2是本发明实施例提供的一种离网供电系统控制方法的流程图;
图3是本发明实施例提供的另一种离网供电系统控制方法的流程图;
图4是本发明实施例提供的再一种离网供电系统控制方法的流程图;
图5是本发明实施例提供的又一种离网供电系统控制方法的流程图;
图6是本发明实施例提供的另一种离网供电系统控制方法的流程图。
具体实施方式
下面将结合本申请实施例中的附图,对本发明实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例仅仅是本发明一部分实施例,而不是 全部的实施例。基于本发明中的实施例,本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例,都属于本发明保护的范围。
参见图1,图1是本发明实施例提供的一种离网供电系统的结构框图,本实施例提供的离网供电系统包括:发电系统、制氢系统、充电系统、第一储能系统、第二储能系统、直流母线、交流母线和控制器(图中未示出),其中,
发电系统的输出端与直流母线相连,作为离网供电系统的主要电能来源,在实际应用中,发电系统可以选用光伏发电系统,当然,也可以选用其他能够独立于国家主干电网、单独供电的发电系统。发电系统在产生电能后,直接输出至直流母线。
制氢系统的直流输入端、第一储能系统的直流连接端、第二储能系统的直流连接端分别与直流母线相连,其中,制氢系统可以直接从直流母线取电,进行制氢作业,第一储能系统和第二储能系统即可以从直流母线取电,进行充电作业,也可以向直流母线输出电能,补充发电系统的供电不足,同时,第一储能系统的交流连接端还与交流母线相连,向交流母线输出电能。进一步的,结合后续内容可知,在本实施例提供的离网供电系统中,第一储能系统主要用于供电,第二储能系统主要用于稳定母线电压。
制氢系统的交流输入端和充电系统分别与交流母线相连。需要说明的是,制氢系统的交流输入端接收的交流电能并非用于制氢作业,而是主要用于制氢系统的辅助系统的运行,比如冷却水循环、空压机运行以及交流配电柜等设备的供电。
可以想到的是,各个构成系统中为了获取满足自身运行要求的电能,必不可少的设置有相应的功率变换装置,比如DC/DC变换器、DC/AC变换器等,本实施例中并未一一列举,在实际应用中可以结合现有技术实现。
控制器分别与发电系统、制氢系统、充电系统、第一储能系统和第二储能系统相连,控制器执行本发明下述各个实施例提供的离网供电系统控制方法,以对离网供电系统的运行过程进行控制。
基于上述离网供电系统的基本构成,本发明实施例提供的一种离网供电系统的控制方法,该控制方法可以应用于系统中的控制器,在某些情况下,也可 以应用于设置于网络侧、能够对离网供电系统内各个构成系统的运行过程进行控制的服务器。参见图2,本实施例提供的一种离网供电系统控制方法的流程包括:
S100、获取第一目标参数和第二目标参数。
具体的,在本实施例中,第一目标参数用于表征第一储能系统的运行状态,相应的,第二目标参数则用于表征第二储能系统的运行状态。可选的,第一目标参数可以是第一储能系统的电池状态值,第二目标参数可以是第二储能系统的电池状态值。通过电池状态值,可以直观的获取相应储能系统的电量剩余情况,进而可以基于电池状态值确定第一储能系统和第二储能系统的工作模式,具体过程将在后续内容展开,此处暂不详述。
对于电池状态值,可以选用SOC值,也可以选用SOH值,可以根据具体控制过程灵活选用,同样属于本发明保护的范围内。
S110、根据第一目标参数和第二目标参数,在多个预设控制策略中确定目标控制策略。
为便于对离网供电系统的运行过程进行控制,本方法提供多种预设控制策略,主要包括过充控制策略、欠充控制策略和平衡控制策略,任一预设控制策略均限定了离网供电系统中各子系统的供电优先级。可以想到的是,本实施例以及后续各个实施例中述及的子系统主要包括图1中所示的发电系统、制氢系统、第一储能系统、第二储能系统和充电系统。
可选的,在第一目标参数为第一储能系统的电池状态值、第二目标参数为第二储能系统的电池状态值的情况下,基于电池状态值与预设电池状态阈值的大小关系进行预设控制策略的选择。可以想到的是,如果电池状态值选用SOC值,则电池状态阈值则为SOC阈值,相应的,如果电池状态值为SOH值,则电池状态阈值则为SOH阈值。
具体的,以选用SOC值为例,如果第一储能系统的SOC值和第二储能系统的SOC值均大于第一SOC阈值,确定过充控制策略为目标控制策略。在实际应用中,第一SOC阈值可以设置的较大,比如设置为70%,此种情况下,第一储能系统和第二储能系统的电量充足,对储能系统进行充电自然不是优先需要考虑的问题,本实施例将此情况下的控制策略定义为过充控制策略。
如果第一储能系统的SOC值和第二储能系统的SOC值均小于第二SOC阈值,确定欠充控制策略为目标控制策略。与过充控制策略相反,在实际应用中,第二SOC阈值设置的较小,比如可以设置为30%,在此种情况下,第一储能系统和第二储能系统的剩余电量都不太高,可以考虑优先对第一储能系统和第二储能系统进行充电,本实施例将此情况下的控制策略定义为欠充控制策略。
最后,如果第一储能系统的SOC值和第二储能系统的SOC值中的至少一个,大于等于第二SOC阈值且小于等于第一SOC阈值,则确定平衡控制策略为目标控制策略,需要结合供电系统中各子系统的具体情况进行控制,本实施例将此情况下的控制策略定义为平衡控制策略。
需要说明的是,对于第一电池状态阈值、第二电池状态阈值的具体设置,可以结合具体的控制需求以及储能系统的实际情况设置,本发明对此不做具体限定。
S120、按照目标控制策略控制离网供电系统运行。
在确定目标控制策略之后,即可按照目标控制策略中限定的各个子系统的供电优先级控制供电系统运行。
综上所述,本发明实施例提供的离网供电系统控制方法,针对离网供电系统提供多个预设控制策略,且各预设控制策略定义离网供电系统中各子系统的供电优先级,能够满足离网供电系统的不同供电需求,对离网供电系统的运行进行更为准确的控制,解决现有技术中缺乏控制方法的问题,有利于促进离网供电系统的推广应用。
下面针对不同的预设控制策略,对按照目标控制策略控制离网供电系统运行的具体过程进行展开介绍。
在过充控制策略为目标控制策略的情况下,控制离网供电系统运行的过程可以参照图3所示实现。
S200、获取离网供电系统的发电总功率和用电总功率。
在实际应用中,离网供电系统的发电总功率指的是离网供电系统中发电系统输出的总功率,虽然第一储能系统和第二储能系统同样可以系统输出功率,供给用电负载运行,但是由于二者的电能同样需要由发电系统提供,因此,离 网供电系统的发电总功率并不包括第一储能系统和第二储能系统的输出功率。
相应的,用电总功率包括离网供电系统所要消耗电功率的系统和设备,如图1所示,包括制氢系统、第一储能系统、第二储能系统以及充电系统的用电功率。
S210、判断发电总功率是否大于用电总功率,若是,执行S220。
如果离网供电系统的发电总功率大于用电总功率,则执行S220以及后续步骤,实现按照优先级由高到低的顺序控制制氢系统、第一储能系统和第二储能系统的供电过程。进一步的,在本实施例中,制氢系统的优先级高于第一储能系统的优先级,第一储能系统的优先级高于第二储能系统的优先级;相反的,如果离网发电系统的发电总功率小于等于用电总功率,则维持系统当前的运行状态。
S220、判断是否可以增大制氢系统的制氢功率,若是,执行S230,若否,执行S240。
在离网供电系统的发电总功率大于用电总功率的情况下,进一步判断是否可以增大制氢系统的制氢功率,如果可以,则执行S230,如果不可以,则执行S240。
可选的,可以按照如下判断标准判断是否可以增大制氢系统的制氢功率:
如果第一储能系统的电池状态值和第二储能系统的电池状态值中的至少一个小于第三电池状态阈值,且制氢系统的氢气储量小于第一氢储量阈值,且制氢系统的当前制氢功率小于制氢功率阈值,判定可以增大制氢系统的制氢功率;
相反的,第一储能系统的电池状态值和第二储能系统的电池状态值均大于等于第三电池状态阈值,或者,氢气储量大于等于第一氢储量阈值,或者,当前制氢功率大于等于制氢功率阈值,判定不可以增大制氢系统的制氢功率。
其中,上述判断标准中的第三电池状态阈值大于前述实施例述及的第一电池状态阈值,在实际应用中,可以选取的较高,仍以SOC值为例,比如可以设置为98%,当然,如果想要为为储能系统预留更多的安全空间,也可以将相应的降低第三SOC阈值的选取,比如设置为90%。设置第三SOC阈值的主要目的在于判断储能系统是否处于或接近于满容量状态,能够吸收更多的电功率,在 此前提下,结合储能系统的实际运行情况选择的第三SOC阈值都是可选的,本发明对于第三SOC阈值的具体取值不做具体限定。
进一步的,第一氢储量阈值应选取较大值,用以衡量或限定是否可以进一步进行制氢作业,比如,可以取氢气储存装置总体容量的98%,作为第一氢储量阈值。相应的,制氢功率阈值可以基于制氢系统的最大制氢功率或额定制氢功率阈值确定,用于衡量是否可以进一步增大制氢功率。本发明对于第一氢储量阈值和制氢功率阈值的具体取值不做限定。
S230、增大制氢功率并降低第一储能系统和第二储能系统的充电功率。
可选的,经过上述判断,如果判定制氢功率仍有增大空间,则进一步增大制氢功率,并降低第一储能系统和第二储能系统的充电功率,直至制氢功率达到前述制氢功率阈值或者第一储能系统和第二储能系统的充电功率降为零值,即全部功率用于制氢,进而达到尽可能的将电能用于制氢,提高制氢效率的目的,当然,这也进一步说明,在本实施例中,制氢系统的供电优先级是高于第一储能系统和第二储能系统的。
S240、增大第一储能系统或第二储能系统的充电功率。
如果制氢功率无法进一步增大,则增大第一储能系统或第二储能系统的充电功率,将发电系统的电能尽可能的存储起来,以便在后续发电系统无法提供足够的电能时使用。
可选的,参见图4,图4所示流程图示出本步骤的可选执行过程。
S300、判断是否可以增大第一储能系统的充电功率,若是,执行S310,若否,执行S320。
可选的,如果第一储能系统的电池状态值小于前述第三电池状态阈值,即还有进一步存储电能的可能,并且,第一储能系统的当前充电功率小于充电功率阈值,即还可以进一步提高充电功率,则判定可以增大第一储能系统的充电功率;相反的,如果第一储能系统的电池状态值大于等于第三电池状态阈值,或者,第一储能系统的当前充电功率大于等于充电功率阈值,判定不可以增大第一储能系统的充电功率。
与前述内容涉及到的阈值设置类似,充电功率阈值的设置以具体采用的储能系统为准,本发明对于充电功率阈值的具体设置不做限定。
S310、增大第一储能系统的充电功率并降低第二储能系统的充电功率。
在判定可以进一步增大第一储能系统的充电功率的情况下,即可增大第一储能系统的充电功率,同时降低第二储能系统的充电功率,优先保证第一储能系统储能,直至第一储能系统的充电功率达到前述充电功率阈值或者第二储能系统的充电功率降为零值,使得第一储能系统以最大的充电功率进行充电。
S320、判断是否可以增大第二储能系统的充电功率,若是,执行S330。
如果S300中判定不可以进一步增大第一储能系统的充电功率,则进一步判断是否可以增大第二储能系统的充电功率。具体的,此步骤的判断逻辑与S300的判断逻辑类似,即如果第二储能系统的电池状态值小于前述第三电池状态阈值,并且,第二储能系统的当前充电功率小于充电功率阈值,则判定可以增大第二储能系统的充电功率;相反的,如果第二储能系统的电池状态值大于等于第三电池状态阈值,或者,第二储能系统的当前充电功率大于等于充电功率阈值,判定不可以增大第二储能系统的充电功率。
需要说明的是,经过前述判断逻辑的筛选,执行至此步骤时,如果判定不可以进一步增大第二储能系统的充电功率,即第一储能系统的电池状态值和第二储能系统的电池状态值均大于等于第三电池状态阈值,说明发电系统的输出功率已经没有办法被进一步吸收,此种情况下,应降低发电系统的输出功率,从而确保系统稳定运行。
相应的,如果制氢系统的氢气储量大于等于第一氢储量阈值,则控制制氢系统停止运行。
S330、增大第二储能系统的充电功率。
可以想到的是,在增大第二储能系统的充电功率的过程中,如果第二储能系统的充电功率达到前述充电功率阈值,即可停止增大第二储能系统的充电功率。
综上所述,在采用过充控制策略的情况下,制氢系统的优先级最高、第一储能系统的优先级其次,第二储能系统的优先级最低,按照优先级由高到低的顺序控制离网供电系统的运行,将电能优先用于制氢,有助于提高电能的利用率。
在平衡控制策略为目标控制策略的情况下,控制离网供电系统运行的过程可以参照图5所示实现。
S400、获取离网供电系统的发电总功率和用电总功率。
可选的,S400的可选实现方式可以参照图3所示实施例中S200中对应的内容,此处不再赘述。
S410、判断发电总功率是否大于用电总功率,若是,执行S420,若否,执行S450。
可选的,S410的可选实现方式可以参照图3所示实施例中S210中对应的内容,此处一步赘述。
S420、判断是否可以增大制氢系统的制氢功率,若是,执行S430,若否,执行S440。
可选的,如果制氢系统的氢气储量小于第二氢储量阈值且制氢系统的当前制氢功率小于制氢功率阈值,则判定可以增大制氢系统的制氢功率;相反的,如果制氢系统的氢气储量大于等于第一氢储量阈值或制氢系统的当前制氢功率达到制氢功率阈值,则判定不可以增大制氢系统的制氢功率。
需要说明的是,本实施例中述及的第二氢储量阈值,小于前述实施例中的述及的第一氢储量阈值,比如,可以将制氢系统能够存储的氢气总量的70%作为第二氢储量阈值。至于制氢功率阈值,需要结合制氢系统的具体参数设置,本发明对第一氢储量阈值和制氢功率阈值的具体取值不做限定。
S430、增大制氢系统的制氢功率并降低第一储能系统和第二储能系统的充电功率。
在判定可以增大制氢系统的制氢功率的情况下,增大制氢系统的制氢功率,同时降低第一储能系统和第二储能系统的充电功率,直至制氢功率达到制氢功率阈值或者第一储能系统和第二储能系统的充电功率降为零值,即优先保证制氢系统用电,以制氢系统的正常运行作为最高优先级。
S440、按照预设充电间隔控制第一储能系统和第二储能系统交替充电。
如果经过S420的判断,认为制氢系统的制氢功率无法进一步增大,则按照预设充电间隔控制第一储能系统和第二储能系统交替充电。
具体的,还可以根据制氢系统的氢气储量做进一步的判断,如果制氢系统 的氢气储量大于等于前述第一氢储量阈值,可以判定氢气储量已经接近饱和,此时可控制制氢系统停机,并按照预设充电间隔控制第一储能系统和第二储能系统交替充电;相应的,如果制氢系统的氢气储量大于等于第二氢储量阈值且小于第一氢储量阈值,则维持制氢系统的当前制氢功率,继续制氢,同时按照预设充电间隔控制第一储能系统和第二储能系统交替充电,并且,处于充电状态的储能系统(可以是第一储能系统,也可以是第二储能系统)的充电功率与制氢系统的制氢功率相同。
可选的,本步骤中按照预设充电间隔控制第一储能系统和第二储能系统交替充电,可以选择第一储能系统和第二储能系统中的任一储能系统作为目标储能系统,首先控制目标储能系统按照预设充电间隔充电,待充电时长达到该预设充电间隔后,停止对目标储能系统充电,转而对目标储能系统以外的另一个储能系统按照预设充电间隔充电,如此往复交替,分别对第一储能系统和第二储能系统进行充电。
S450、在发电总功率小于用电总功率的情况下,降低制氢系统的制氢功率。
如果发电系统的发电总功率小于用电总功率,为了确保整个系统的稳定,需要降低制氢系统的制氢功率,优先减少制氢系统对于电能的消耗,使得更多的电功率用于供给用电负荷,进而确保用电负荷的正常运行。
S460、按照预设放电间隔控制第一储能系统和第二储能系统交替放电。
为了对第一储能系统和第二储能系统的放电过程进行更为细致的控制,本实施例在前述第一氢储量阈值的基础上,进一步给定第二氢储量阈值和第三氢储量阈值,并且,第二氢储量阈值小于前述第一氢储量阈值,第三氢储量阈值小于第二氢储量阈值,比如,第二氢储量阈值可以是总储量的70%,第三氢储量阈值可以是总储量的30%。
在此基础上,进一步判断制氢系统的氢气储量是否大于第二氢储量阈值,如果制氢系统的氢气储量大于第二氢储量阈值,则直接降低制氢系统的制氢功率至零值,并按照预设放电间隔控制第一储能系统和第二储能系统交替放电。
如果制氢系统的氢气储量小于等于第二氢储量阈值,且大于等于第三氢储量阈值,则按照预设比例降低制氢系统的制氢功率,即不直接降低至零值,而是以相对较小的制氢功率继续制氢,同时按照预设放电间隔控制第一储能系统 和第二储能系统交替放电。
再进一步的,如果制氢系统的氢气储量小于第三氢储量阈值,则降低第一储能系统和第二储能系统的放电功率至零值,并降低制氢系统的制氢功率。
需要说明的是,本实施例中按照预设放电间隔控制第一储能系统和第二储能系统交替放电的过程,与前述按照预设充电间隔控制第一储能系统和第二储能系统交替充电的过程是类似的。具体的,可以选择第一储能系统和第二储能系统中的任一储能系统作为目标储能系统,首先控制目标储能系统按照预设放电间隔放电,待放电时长达到该预设放电间隔后,停止对目标储能系统放电,转而对目标储能系统以外的另一个储能系统按照预设放电间隔放电,如此往复交替,分别对第一储能系统和第二储能系统进行放电。
可选的,如果发电系统的发电总功率等于用电总功率,则维持离网供电系统的当前运行状态。
综上所述,在采用平衡控制策略对离网供电系统进行控制时,同样需要按照优先级由高到低的顺序控制制氢系统、第一储能系统和第二储能系统的供电过程,具体到平衡控制策略中,制氢系统的优先级高于第一储能系统和第二储能系统的优先级,第一储能系统和第二储能系统的优先级相同,可以同时对第一储能系统和第二储能系统进行充放电控制。
在欠充控制策略为目标控制策略的情况下,控制离网供电系统运行的过程可以参照图6所示实现。
S500、获取离网供电系统的发电总功率和用电总功率。
可选的,S500的可选实现方式可以参照图3所示实施例中S200中对应的内容,此处不再赘述。
S510、判断发电总功率是否大于用电总功率,若是,执行S520。
可选的,S510的可选实现方式可以参照图3所示实施例中S210中对应的内容,此处一步赘述。
如果发电总功率等于用电总功率,则不需进行进一步的处理,维持系统当前运行状态即可,如果发电总功率小于用电总功率则降低用电负载的用电负荷,需要说明的是,由于制氢负荷属于特殊的用电负荷,因此,在降低用电负 荷的过程中,应优先降低制氢功率,即降低制氢负荷,然后再逐步降低系统所连接的其他用电负荷。
S520、判断制氢系统的氢气储量是否大于等于第三氢储量阈值,若否,执行S530,若是,执行S540。
S530、控制充电系统停机,并降低制氢系统的制氢功率。
在制氢系统的氢气储量小于第三氢储量阈值的情况下,优先控制充电系统停机,减少用电功率的总量,同时,逐步降低制氢系统的制氢功率,直至将制氢功率降低为零值。
S540、判断第一储能系统的电池状态值和第二储能系统的电池状态值是否均小于第四电池状态阈值,若是,执行S550。
在制氢系统的氢气储量大于等于第三氢储量阈值的情况下,进一步判断第一储能系统的电池状态值和第二储能系统的电池状态值与第四电池状态阈值的大小关系。需要说明的是,在本实施例中,第四电池状态阈值需要取较小的值,小于前述任意一个电池状态阈值,比如,可以取2%,如果储能系统的电池状态值小于第四电池状态阈值,则说明储能系统的电量已经非常低了,继续充电。
如果第一储能系统和第二储能系统中至少一个储能系统的电池状态值大于第四电池状态阈值,则增大电池状态值大于第四电池状态阈值的储能系统的放电功率。
S550、控制制氢系统和充电系统停机,并按照发电总功率对第一储能系统和第二储能系统充电。
在制氢系统的氢气储量大于等于第三氢气储量阈值,且第一储能系统和第二储能系统的电池状态值均小于第四电池状态阈值的情况下,控制制氢系统和充电系统停机,按照发电总功率对第一储能系统和第二储能系统充电,即将发电系统的全部功率用于对储能系统进行充电。
综合上述控制过程可以看出,在欠充控制策略中,虽然也是按照优先级由高到低的顺序控制制氢系统、第一储能系统、第二储能系统和充电系统的供电过程,但是,与前述实施例不同的是,本实施例中第一储能系统和第二储能系统的优先级高于制氢系统的优先级,制氢系统的优先级高于充电系统的优先 级。
结合上述各个实施例提供的控制方法可以看出,本发明针对包括两个储能系统的离网供电系统所提供的控制方法,不仅可以满足离网供电系统的不同供电需求,对离网供电系统的运行进行更为准确的控制,解决现有技术中缺乏控制方法的问题,进一步的,通过对第一储能系统和第二储能系统的分别控制,使得第一储能系统和第二储能系统发挥了不同的功能,第一储能系统主要用于为用电负载供电,所以在充放电控制过程中,第一储能系统的优先级高于第二储能系统,而第二储能系统则主要用户稳定直流母线的电压,在控制过程中,维持第二储能系统的SOC至在合理区间,能够稳定输出电压即可,因此其优先级较低,通过第一储能系统和第二储能系统的配合,有效提高离网供电系统的运行稳定性。
本发明中各个实施例采用递进的方式描述,每个实施例重点说明的都是与其他实施例的不同之处,各个实施例之间相同相似部分互相参见即可。对于实施例公开的装置而言,由于其与实施例公开的方法相对应,所以描述的比较简单,相关之处参见方法部分说明即可。
以上所述,仅是本发明的较佳实施例而已,并非对本发明作任何形式上的限制。虽然本发明已以较佳实施例揭露如上,然而并非用以限定本发明。任何熟悉本领域的技术人员,在不脱离本发明技术方案范围情况下,都可利用上述揭示的方法和技术内容对本发明技术方案做出许多可能的变动和修饰,或修改为等同变化的等效实施例。因此,凡是未脱离本发明技术方案的内容,依据本发明的技术实质对以上实施例所做的任何简单修改、等同变化及修饰,均仍属于本发明技术方案保护的范围内。

Claims (20)

  1. 一种离网供电系统控制方法,其特征在于,应用于包括多个子系统的离网供电系统,且所述多个子系统包括第一储能系统和第二储能系统,所述方法包括:
    获取第一目标参数和第二目标参数;
    其中,所述第一目标参数表征所述第一储能系统的运行状态,所述第二目标参数表征所述第二储能系统的运行状态;
    根据所述第一目标参数和所述第二目标参数,在多个预设控制策略中确定目标控制策略;
    其中,所述预设控制策略包括所述离网供电系统中各子系统的供电优先级;
    按照所述目标控制策略控制所述离网供电系统运行。
  2. 根据权利要求1所述的离网供电系统控制方法,其特征在于,所述第一目标参数包括所述第一储能系统的电池状态值,所述第二目标参数包括所述第二储能系统的电池状态值;
    所述多个预设控制策略包括过充控制策略、欠充控制策略和平衡控制策略;
    所述根据所述第一目标参数和所述第二目标参数,在多个预设控制策略中确定目标控制策略,包括:
    若所述第一储能系统的电池状态值和所述第二储能系统的电池状态值均大于第一电池状态阈值,确定所述过充控制策略为目标控制策略;
    若所述第一储能系统的电池状态值和所述第二储能系统的电池状态值均小于第二电池状态阈值,确定所述欠充控制策略为目标控制策略;
    若所述第一储能系统的电池状态值和所述第二储能系统的电池状态值中的至少一个,大于等于所述第二电池状态阈值且小于等于所述第一电池状态阈值,确定所述平衡控制策略为目标控制策略。
  3. 根据权利要求2所述的离网供电系统控制方法,其特征在于,所述多个子系统还包括制氢系统;
    在所述过充控制策略为目标控制策略情况下,所述按照所述目标控制策略控制所述离网供电系统运行,包括:
    获取所述离网供电系统的发电总功率和用电总功率;
    若所述发电总功率大于所述用电总功率,按照优先级由高到低的顺序控制所述制氢系统、所述第一储能系统和所述第二储能系统的供电过程;
    其中,所述制氢系统的优先级高于所述第一储能系统的优先级,所述第一储能系统的优先级高于所述第二储能系统的优先级。
  4. 根据权利要求3所述的离网供电系统控制方法,其特征在于,所述按照优先级由高到低的顺序控制所述制氢系统、所述第一储能系统和所述第二储能系统的供电过程,包括:
    判断是否可以增大所述制氢系统的制氢功率;
    若可以增大所述制氢功率,增大所述制氢功率并降低所述第一储能系统和所述第二储能系统的充电功率;
    若不可以增大所述制氢功率,增大所述第一储能系统或所述第二储能系统的充电功率。
  5. 根据权利要求4所述的离网供电系统控制方法,其特征在于,所述判断是否可以增大所述制氢系统的制氢功率,包括:
    若所述第一储能系统的电池状态值和所述第二储能系统的电池状态值中的至少一个小于第三电池状态阈值,
    且所述制氢系统的氢气储量小于第一氢储量阈值,
    且所述制氢系统的当前制氢功率小于制氢功率阈值,判定可以增大所述制氢系统的制氢功率;
    若所述第一储能系统的电池状态值和所述第二储能系统的电池状态值均大于等于所述第三电池状态阈值,
    或者,所述氢气储量大于等于所述第一氢储量阈值,
    或者,所述当前制氢功率大于等于所述制氢功率阈值,判定不可以增大所述制氢系统的制氢功率;
    其中,所述第三电池状态阈值大于所述第一电池状态阈值。
  6. 根据权利要求5所述的离网供电系统控制方法,其特征在于,所述增 大所述制氢功率并降低所述第一储能系统和所述第二储能系统的充电功率,包括:
    增大所述制氢功率并降低所述第一储能系统和所述第二储能系统的充电功率,直至所述制氢功率达到所述制氢功率阈值或者所述第一储能系统和所述第二储能系统的充电功率降为零值。
  7. 根据权利要求5所述的离网供电系统控制方法,其特征在于,所述多个子系统还包括发电系统,所述方法还包括:
    在所述第一储能系统的电池状态值和所述第二储能系统的电池状态值均大于等于所述第三电池状态阈值的情况下,降低所述发电系统的发电功率;
    在所述氢气储量大于等于所述第一氢储量阈值的情况下,控制所述制氢系统停止运行。
  8. 根据权利要求5所述的离网供电系统控制方法,其特征在于,所述增大所述第一储能系统或所述第二储能系统的充电功率,包括:
    判断是否可以增大所述第一储能系统的充电功率;
    若可以增大所述第一储能系统的充电功率,增大所述第一储能系统的充电功率并降低所述第二储能系统的充电功率;
    若不可以增大所述第一储能系统的充电功率,判断是否可以增大所述第二储能系统的充电功率;
    若可以增大所述第二储能系统的充电功率,增大所述第二储能系统的充电功率。
  9. 根据权利要求8所述的离网供电系统控制方法,其特征在于,所述判断是否可以增大所述第一储能系统的充电功率,包括:
    若所述第一储能系统的电池状态值小于所述第三电池状态阈值,且所述第一储能系统的当前充电功率小于充电功率阈值,判定可以增大所述第一储能系统的充电功率;
    若所述第一储能系统的电池状态值大于等于所述第三电池状态阈值,或者,所述第一储能系统的当前充电功率大于等于所述充电功率阈值,判定不可以增大所述第一储能系统的充电功率。
  10. 根据权利要求2所述的离网供电系统控制方法,其特征在于,所述多 个子系统还包括制氢系统;
    在所述平衡控制策略为目标控制策略情况下,所述按照所述目标控制策略控制所述离网供电系统运行,包括:
    获取所述离网供电系统的发电总功率和用电总功率;
    若所述发电总功率大于所述用电总功率,按照优先级由高到低的顺序控制所述制氢系统、所述第一储能系统和所述第二储能系统的供电过程;
    其中,所述制氢系统的优先级高于所述第一储能系统和所述第二储能系统的优先级,所述第一储能系统和所述第二储能系统的优先级相同。
  11. 根据权利要求10所述的离网供电系统控制方法,其特征在于,所述按照优先级由高到低的顺序控制所述制氢系统、所述第一储能系统和所述第二储能系统的供电过程,包括:
    判断是否可以增大所述制氢系统的制氢功率;
    若可以增大所述制氢功率,增大所述制氢系统的制氢功率并降低所述第一储能系统和所述第二储能系统的充电功率;
    若不可以增大所述制氢功率,按照预设充电间隔控制所述第一储能系统和所述第二储能系统交替充电。
  12. 根据权利要求11所述的离网供电系统控制方法,其特征在于,所述判断是否可以增大所述制氢系统的制氢功率,包括:
    若所述制氢系统的氢气储量小于第二氢储量阈值且所述制氢系统的当前制氢功率小于制氢功率阈值,判定可以增大所述制氢系统的制氢功率;
    若所述制氢系统的氢气储量大于等于第一氢储量阈值或所述制氢系统的当前制氢功率达到所述制氢功率阈值,判定不可以增大所述制氢系统的制氢功率;
    其中,所述第二氢储量阈值小于所述第一氢储量阈值。
  13. 根据权利要求12所述的离网供电系统控制方法,其特征在于,所述增大所述制氢系统的制氢功率并降低所述第一储能系统和所述第二储能系统的充电功率,包括:
    增大所述制氢系统的制氢功率并降低所述第一储能系统和所述第二储能系统的充电功率,直至所述制氢功率达到所述制氢功率阈值或者所述第一储能 系统和所述第二储能系统的充电功率降为零值。
  14. 根据权利要求12所述的离网供电系统控制方法,其特征在于,所述按照预设充电间隔控制所述第一储能系统和所述第二储能系统交替充电,包括:
    若所述制氢系统的氢气储量大于等于所述第一氢储量阈值,控制所述制氢系统停机,并按照预设充电间隔控制所述第一储能系统和所述第二储能系统交替充电;
    若所述制氢系统的氢气储量大于等于所述第二氢储量阈值且小于所述第一氢储量阈值,按照预设充电间隔控制所述第一储能系统和所述第二储能系统交替充电;
    并且,处于充电状态的储能系统的充电功率与所述制氢系统的制氢功率相同。
  15. 根据权利要求10所述的离网供电系统控制方法,其特征在于,若所述发电总功率小于所述用电总功率,降低所述制氢系统的制氢功率;
    按照预设放电间隔控制所述第一储能系统和所述第二储能系统交替放电;
    若所述发电总功率等于所述用电总功率,维持所述离网供电系统的当前运行状态。
  16. 根据权利要求15所述的离网供电系统控制方法,其特征在于,所述按照预设放电间隔控制所述第一储能系统和所述第二储能系统交替放电,包括:
    若所述制氢系统的氢气储量大于第二氢储量阈值,降低所述制氢系统的制氢功率至零值,并按照预设放电间隔控制所述第一储能系统和所述第二储能系统交替放电;
    若所述制氢系统的氢气储量小于等于所述第二氢储量阈值,且大于等于第三氢储量阈值,按照预设比例降低所述制氢系统的制氢功率,并按照预设放电间隔控制所述第一储能系统和所述第二储能系统交替放电;
    若所述制氢系统的氢气储量小于所述第三氢储量阈值,降低所述第一储能系统和所述第二储能系统的放电功率至零值,并降低所述制氢系统的制氢功率;
    其中,所述第三氢储量阈值小于所述第二氢储量阈值,所述预设比例大于零。
  17. 根据权利要求2所述的离网供电系统控制方法,其特征在于,所述多个子系统还包括制氢系统和充电系统;
    在所述欠充控制策略为目标控制策略情况下,所述按照所述目标控制策略控制所述离网供电系统运行,包括:
    获取所述离网供电系统的发电总功率和用电总功率;
    若所述发电总功率大于所述用电总功率,按照优先级由高到低的顺序控制所述制氢系统、所述第一储能系统、所述第二储能系统和所述充电系统的供电过程;
    其中,所述第一储能系统和所述第二储能系统的优先级高于所述制氢系统的优先级,所述制氢系统的优先级高于所述充电系统的优先级。
  18. 根据权利要求17所述的离网供电系统控制方法,其特征在于,所述按照优先级由高到低的顺序控制所述制氢系统、所述第一储能系统、所述第二储能系统和所述充电系统的供电过程,包括:
    若所述制氢系统的氢气储量大于等于第三氢储量阈值,控制所述充电系统停机;
    降低所述制氢系统的制氢功率;
    若所述制氢系统的氢气储量小于所述第三氢储量阈值,且所述第一储能系统的电池状态值和所述第二储能系统的电池状态值均小于第四电池状态阈值,控制所述制氢系统和所述充电系统停机;
    按照所述发电总功率对所述第一储能系统和所述第二储能系统充电。
  19. 一种离网供电系统,其特征在于,包括:发电系统、制氢系统、充电系统、第一储能系统、第二储能系统、直流母线、交流母线和控制器,其中,
    所述发电系统的输出端与所述直流母线相连;
    所述制氢系统的直流输入端、所述第一储能系统的直流连接端、所述第二储能系统的直流连接端分别与所述直流母线相连;
    所述第一储能系统的交流连接端与所述交流母线相连;
    所述制氢系统的交流输入端和所述充电系统分别与所述交流母线相连;
    所述控制器分别与所述发电系统、所述制氢系统、所述充电系统、所述第一储能系统、所述第二储能系统相连;
    所述控制器执行权利要求1-18任一项所述的离网供电系统控制方法。
  20. 根据权利要求19所述的离网供电系统,其特征在于,所述发电系统包括光伏发电系统。
PCT/CN2022/096852 2021-07-28 2022-06-02 一种离网供电系统及其控制方法 WO2023005422A1 (zh)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106712093A (zh) * 2017-01-23 2017-05-24 南京理工大学 基于大容量储能系统的孤岛并联运行的控制方法
JP2018133035A (ja) * 2017-02-17 2018-08-23 株式会社東芝 設備設計支援方法、設備設計支援装置、およびプログラム
CN112653150A (zh) * 2020-11-25 2021-04-13 珠海格力电器股份有限公司 离网发供电系统
CN113541193A (zh) * 2021-07-28 2021-10-22 阳光新能源开发有限公司 一种离网供电系统及其控制方法

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11144021B2 (en) * 2016-05-10 2021-10-12 Conectric, Llc Method and system for intelligently recommending control schemes optimizing peak energy consumption of built environment
CN106786554A (zh) * 2017-01-17 2017-05-31 珠海格力电器股份有限公司 微电网系统的控制方法及装置
CN107147109B (zh) * 2017-05-10 2020-03-17 袁铁江 风电-氢储能与煤化工多能耦合系统气体分配控制方法
CN109193783B (zh) * 2018-10-23 2021-08-24 哈尔滨电气股份有限公司 一种离网型风光储多能互补电热水气联供方法
CN111224426B (zh) * 2020-02-20 2021-09-03 阳光电源股份有限公司 一种光伏离网制氢站及其供电控制方法
CN111695764A (zh) * 2020-04-29 2020-09-22 中国能源建设集团江苏省电力设计院有限公司 一种含储能制氢混合系统的火电厂能量调控系统及调控方法
CN213425792U (zh) * 2020-10-16 2021-06-11 上海绿巨人爱爵能源科技有限公司 一种离网型微电网电解水制氢系统
CN112953021A (zh) * 2021-02-23 2021-06-11 阳光电源股份有限公司 一种可再生能源制氢系统及其控制方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106712093A (zh) * 2017-01-23 2017-05-24 南京理工大学 基于大容量储能系统的孤岛并联运行的控制方法
JP2018133035A (ja) * 2017-02-17 2018-08-23 株式会社東芝 設備設計支援方法、設備設計支援装置、およびプログラム
CN112653150A (zh) * 2020-11-25 2021-04-13 珠海格力电器股份有限公司 离网发供电系统
CN113541193A (zh) * 2021-07-28 2021-10-22 阳光新能源开发有限公司 一种离网供电系统及其控制方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
XU JIALE: "Research on Control Strategy of Hydrogen Generation System of Photovoltaic Power Generation with Hybrid Energy Storage", CHINA MASTER'S' THESES FULL-TEXT DATABASE (ELECTRONIC JOURNAL)-INFORMATION & TECHNOLOGY), TIANJIN POLYTECHNIC UNIVERSITY, CN, no. 1, 15 January 2021 (2021-01-15), CN , XP093029409, ISSN: 1674-0246 *

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