Comprehensive energy system based on wind-solar-hydrogen storage multi-energy complement and control method

Abstract

The application relates to a comprehensive energy system based on wind-solar-hydrogen storage multi-energy complementation, which comprises a hydrogen storage and transportation module, a wind-solar coupling power generation system, and a short-term energy storage system, a medium and long-term energy storage module and a hydrogen energy comprehensive utilization module connected with the output end of the hydrogen storage and transportation module; the prepared hydrogen is input into the hydrogen storage and transportation module, the hydrogen storage and transportation module sends the stored and transported H2 into the short-term energy storage system for short-term energy storage, into the medium and long-term energy storage module for medium and long-term energy storage, and into the hydrogen energy comprehensive utilization module to react with the input CO and CO2 of the medium and long-term energy storage module to prepare methanol. Compared with the prior art, the application can realize the consumption of renewable energy power through energy storage power stations and electrolytic hydrogen production, and can realize flexible power supply through energy storage power stations and fuel cells, so that the flexible adjustment capability of the power supply side is strengthened, and the actual application requirements are met.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of distributed energy storage, in particular to a comprehensive energy system based on wind-solar-hydrogen storage multi-energy complementation and a control method. BACKGROUND

[0002] With the development of economy and science and technology, especially the active promotion and application of renewable energy, the energy demand of users also begins to develop in a diversified direction. At the same time, with the development and maturity of different energy technologies, the selection of technologies is increasing. As an open energy system, distributed energy system begins to show a multi-functional trend, which contains multiple energy inputs and can simultaneously meet the multiple energy demands of users.

[0003] Distributed energy system is relative to the traditional centralized energy supply system. The traditional centralized energy supply system uses large-capacity equipment, produces centrally, and then delivers various energy to a large number of users in a large range through special delivery facilities (large power grid, large heat network, etc.). The distributed energy system directly faces users, produces and supplies energy on site according to the needs of users, has multiple functions, and can meet multiple goals of small and medium-sized energy conversion and utilization systems. Among them, wind-solar-water storage and wind-solar-fire storage are common energy storage methods in existing distributed energy systems, which play a crucial role in actual energy storage.

[0004] However, wind-solar-fire storage only has one flexible load of energy storage power station, and the capacity of energy storage power station is limited, which is difficult to large-scale consumption of renewable energy. Wind-solar-water storage has a huge investment in the early stage of development, and has strict requirements for geographical conditions. Therefore, it is urgent to provide a comprehensive energy system that can large-scale consume clean power on site and strengthen the flexible adjustment capability of the power supply side. SUMMARY

[0005] Therefore, it is necessary to provide a comprehensive energy system based on wind-solar-hydrogen storage multi-energy complementation and a control method that can large-scale consume clean power on site and strengthen the flexible adjustment capability of the power supply side.

[0006] The embodiment of the present application provides a comprehensive energy system based on wind-solar-hydrogen storage multi-energy complementation, which comprises: a hydrogen storage and transportation module, a wind-solar coupling power generation system, and a short-term energy storage system, a medium and long-term energy storage module and a hydrogen energy comprehensive utilization module connected with the output end of the hydrogen storage and transportation module; the wind-solar coupling power generation system inputs the prepared hydrogen into the hydrogen storage and transportation module, the hydrogen storage and transportation module sends the stored and transported H2 into the short-term energy storage system for short-term energy storage, into the medium and long-term energy storage module for medium and long-term energy storage, and into the hydrogen energy comprehensive utilization module to react with CO and CO2 input from the medium and long-term energy storage module for methanol preparation.

[0007] Further, the hydrogen storage and transportation module comprises a hydrogen compressor and a high-pressure hydrogen storage tank in sealed connection with the hydrogen compressor.

[0008] Further, the wind-solar coupling power generation system comprises a wind-solar coupling power generation module and a hydrogen production module connected with an output end of the wind-solar coupling power generation module through an AC bus.

[0009] The wind-solar coupling power generation module comprises a wind power generation system and a photovoltaic power generation system, the wind power generation system is electrically connected with the AC bus through a first AC / AC converter, and the photovoltaic power generation system is electrically connected with the AC bus through a first DC / AC inverter.

[0010] The hydrogen production module comprises a hydrogen production station and a buffer tank in sealed connection with an output end of the hydrogen production station, and the hydrogen production station is electrically connected with the AC bus through an AC / DC rectifier.

[0011] Further, the short-term energy storage system comprises a short-term energy storage station and a fuel cell module electrically connected with the short-term energy storage station through an AC bus.

[0012] The short-term energy storage module comprises an energy storage station electrically connected with the AC bus through a second bidirectional DC-AC converter.

[0013] The fuel cell module comprises a hydrogen fuel cell electrically connected with the AC bus through a third DC / AC inverter.

[0014] Further, the medium and long-term energy storage module comprises a Fischer-Tropsch synthesis system, a thermal power generating unit connected with an output end of the Fischer-Tropsch synthesis system, a CO2 reduction device connected with an input end of the Fischer-Tropsch synthesis system, and a CO2 capture-storage device connected with an input end of the CO2 reduction device.

[0015] The CO2 capture-storage device captures CO2 from flue gas or air and provides the CO2 to the CO2 reduction device, the CO2 reduction device reduces the CO2 into CO and delivers the CO to the Fischer-Tropsch synthesis system, and the Fischer-Tropsch synthesis system prepares alkane fuel and alcohol fuel by Fischer-Tropsch synthesis reaction with CO and H2 as raw materials and provides the alkane fuel and the alcohol fuel to the thermal power generating unit.

[0016] The thermal power generating unit is connected with the AC bus through a second AC / AC converter and supplies power to the AC bus.

[0017] Further, the hydrogen energy comprehensive utilization module comprises an air separation device, an ammonia synthesis system, a hydrogenation station and a methanol preparation system.

[0018] The high-pressure hydrogen storage tank provides H2 for the ammonia synthesis system, hydrogen refueling station and methanol preparation system, the air separation device provides N2 for the ammonia synthesis system, and the CO2 capture-storage device and the CO2 reduction device provide CO2 and CO respectively for the methanol preparation system.

[0019] Further, the integrated energy system further comprises a grid-connected module electrically connected to the medium and long-term energy storage module through an AC bus, and a power monitoring control module for monitoring the wind power P w , photovoltaic power P PV , system load P L , grid load P grid , hydrogen production station power P EL , energy storage power station state of charge SOC BES , energy storage power station power P BES , hydrogen fuel cell power P FC and thermal power generator set power P Gen ; wherein the system load P L includes the power demand of the hydrogen compressor, the high-pressure hydrogen storage tank, the CO2 capture-storage device, the Fischer-Tropsch synthesis system, the ammonia synthesis system, the hydrogen refueling station and the methanol preparation system, and the air separation device; and the grid-connected module includes the grid and a third AC / AC converter electrically connected to the AC bus.

[0020] Another embodiment of the present application provides a control method for an integrated energy system based on wind-solar-hydrogen storage multi-energy complementation, characterized in that it is applicable to the integrated energy system based on wind-solar-hydrogen storage multi-energy complementation described above, and the method comprises the following steps:

[0021] Obtaining the wind power P w , photovoltaic power P PV , system load P L , grid load P grid and their corresponding power sum P s = P w + P PV -P L -P grid of the integrated energy system within a natural day.

[0022] Determining the working mode of the integrated energy system according to the relationship between the power sum P s , hydrogen production station power P EL , energy storage power station state of charge SOC BES , energy storage power station power P BES and hydrogen fuel cell power P FC ; the working mode of the integrated energy system includes preferentially using electrolytic hydrogen production to consume renewable energy power and preferentially using energy storage power station power, wherein when preferentially using electrolytic hydrogen production to consume renewable energy power, the power sum Ps greater than zero, the power and P s less than zero.

[0023] Further, when the electrolytic hydrogen production is preferentially used to accommodate renewable energy power, the method comprises:

[0024] When the system satisfies , the hydrogen production station operates in a rated state, P EL = P EL_max , the state of charge SOC BES of the energy storage power station is at a maximum value SOC BES_max , the energy storage power station enters a shutdown state P BES = 0, and a first operating mode of abandoning wind power and solar power is adopted to maintain system power balance;

[0025] When the system satisfies , the hydrogen production station operates in a rated state, the hydrogen production station power P EL uses maximum power, P EL = P EL_max , the energy storage power station accommodates the remaining system power, at this time the remaining system power is the energy storage power station power P BES , P BES = P s -P EL_max , when the state of charge SOC BES of the energy storage power station rises to the maximum value SOC BES_max , the battery is fully charged, and the system is switched from the current second operating mode to the first operating mode;

[0026] When the system satisfies P EL_min ≤ P s ≤ P EL_max , the hydrogen production station accommodates the remaining system power, at this time the remaining system power is the hydrogen production station power P EL , P EL = P s , and a third operating mode is operated;

[0027] When the system satisfies , the hydrogen production station power P EL uses minimum power, P EL = P EL_min , the energy storage power station discharges to compensate for the system power shortage, at this time the system power shortage is the energy storage power station power P BES , P BES = P EL_min -P s , during which the state of charge SOC BES of the energy storage power station continuously decreases, and when SOC BES decreases to the minimum value SOC BES_min , the system is switched from the current third operating mode to the first operating mode.When the system meets the condition of P

[0028] When the system meets the condition of P When the system meets the condition of P BES , P BES = P s , and the state of charge SOC BES of the energy storage power station is continuously rising, when the SOC BES rises to the maximum value SOC BES_max , the system is switched from the current fifth operating mode to the fourth operating mode.

[0029] Further, when the power of the energy storage power station is preferentially used, the method comprises:

[0030] When the system meets the condition of P , the hydrogen fuel cell is shut down, the energy storage power station is discharged at rated power, P BES = P BES_max , and the sixth operating mode of using the grid frequency regulation unit to increase the output is adopted to maintain the system power balance.

[0031] When the system meets the condition of P , the energy storage power station is discharged at rated power, P BES = P BES_max , and the hydrogen fuel cell compensates for the system power shortage, at this time the system power shortage is the power P BES of the energy storage power station, P FC = |P s | - P BES_max , and the seventh operating mode is run.

[0032] When the system meets the condition of P BES_min ≤ |P s | ≤ P BES_max , the energy storage power station is discharged to compensate for the system power shortage, at this time the system power shortage is the power P BES of the energy storage power station, P BES = |P s |, and the hydrogen fuel cell is shut down, and the eighth operating mode is run.

[0033] When the system meets the condition of P FC_min ≤ |P s | < P BES_mmin , the hydrogen fuel cell compensates for the system power shortage, at this time the system power shortage is the power P FC of the hydrogen fuel cell, P FC_min = |P s |, and the ninth operating mode is run.

[0034] When the system meets the condition of When the hydrogen fuel cell minimum power operation P FC = P FC_min , the energy storage power station charging absorption system absorbs the remaining power, at this time the system power remaining power is the energy storage power station power P BES , P BES = P FC_min -|P s |, the tenth operation mode is operated.

[0035] Another embodiment of the present application also provides a computer readable storage medium, the computer readable storage medium comprises a stored computer program; wherein the computer program controls the device where the computer readable storage medium is located to execute the wind and light hydrogen storage multi-energy complementary comprehensive energy system control method as described above when running.

[0036] Another embodiment of the present application also provides a terminal device, comprising a processor, a memory and a computer program stored in the memory and configured to be executed by the processor, the processor implements the wind and light hydrogen storage multi-energy complementary comprehensive energy system control method as described above when executing the computer program.

[0037] The above-mentioned wind and light hydrogen storage multi-energy complementary comprehensive energy system, the system comprises a hydrogen storage and transportation module, a wind and light coupling power generation system, and a short-term energy storage system, a medium and long-term energy storage module and a hydrogen energy comprehensive utilization module connected with the output end of the hydrogen storage and transportation module; the wind and light coupling power generation system inputs the prepared hydrogen into the hydrogen storage and transportation module, the hydrogen storage and transportation module sends the stored and transported H2 into the short-term energy storage system for short-term energy storage, into the medium and long-term energy storage module for medium and long-term energy storage, and into the hydrogen energy comprehensive utilization module to react with CO and CO2 input from the medium and long-term energy storage module for methanol preparation. Compared with the prior art, the present application enhances the flexible adjustment capability of the power side by using the energy storage power station, electrolytic hydrogen consumption of renewable energy power and flexible power supply of the energy storage power station and fuel cell, and meets the actual application requirements. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 The structure block diagram of the wind and light hydrogen storage multi-energy complementary comprehensive energy system provided by the embodiment of the present application is shown in the figure;

[0039] Figure 2 The signal source diagram of the power control module is shown in the figure;

[0040] Figure 3 The flowchart of the wind and light hydrogen storage multi-energy complementary comprehensive energy system control method provided by the embodiment of the present application is shown in the figure

[0041] Figure 4 The system power generation and power consumption power balance measure priority diagram is shown in the figure;

[0042] Figure 5 A schematic diagram of a comprehensive energy system strategy based on wind-solar-hydrogen storage multi-energy complementarity is provided for another embodiment of the present application. DETAILED DESCRIPTION

[0043] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0044] It should be noted that the step numbers in the text are only for the convenience of explaining the specific embodiments, and do not serve as the basis for determining the execution sequence of the steps. The method provided in the present embodiment can be executed by a related server, and the server is taken as an example for description hereinafter.

[0045] As shown in Figures 1 to 2 The present embodiment provides a comprehensive energy system based on wind-solar-hydrogen storage multi-energy complementarity, which comprises:

[0046] a hydrogen storage and transportation module, a wind-solar coupling power generation system, and a short-term energy storage system, a medium and long-term energy storage module, and a hydrogen energy comprehensive utilization module connected with the output end of the hydrogen storage and transportation module. The hydrogen gas prepared by the wind-solar coupling power generation system is input into the hydrogen storage and transportation module, the hydrogen storage and transportation module sends the stored and transported H2 into the short-term energy storage system for short-term energy storage, into the medium and long-term energy storage module for medium and long-term energy storage, and into the hydrogen energy comprehensive utilization module to react with CO and CO2 input from the medium and long-term energy storage module for methanol preparation.

[0047] Further, the wind-solar coupling power generation system comprises a wind-solar coupling power generation module and a hydrogen production module connected with the output end of the wind-solar coupling power generation module through an alternating current bus. The hydrogen storage and transportation module comprises a hydrogen compressor and a high-pressure hydrogen storage tank in sealed connection with the hydrogen compressor.

[0048] Specifically, the wind-solar coupling power generation module includes a wind power generation system and a photovoltaic power generation system, the wind power generation system is electrically connected with the AC bus through a first AC / AC converter AC / AC1, and the photovoltaic power generation system is electrically connected with the AC bus through a DC / AC inverter. The hydrogen production module includes a hydrogen production station and a buffer tank which is sealingly connected with an output end of the hydrogen production station, and the hydrogen production station is electrically connected with the AC bus through an AC / DC rectifier. It can be understood that the wind power generation system converts wind energy into electric energy and supplies power to the AC bus through the first AC / AC converter AC / AC1; the photovoltaic power generation system converts light energy into electric energy and supplies power to the AC bus through the first DC / AC inverter DC / AC1; the hydrogen production station takes power from the AC bus through the AC / DC rectifier, and the prepared hydrogen enters a hydrogen compressor through the buffer tank, and the hydrogen compressor charges the high-pressure hydrogen storage tank, so as to supply hydrogen to the fuel cell module, the hydrogen energy comprehensive utilization module and the medium and long-term energy storage module in time.

[0049] Further, the short-term energy storage system includes a short-term energy storage station and a fuel cell module which is electrically connected with the short-term energy storage station through the AC bus.

[0050] Specifically, the short-term energy storage module includes an energy storage station which is electrically connected with the AC bus through a second bidirectional DC-AC converter DC / AC2. The fuel cell module includes a hydrogen fuel cell which is electrically connected with the AC bus through a third DC / AC inverter DC / AC3. It can be understood that the energy storage station supplies power to the AC bus through the second bidirectional DC-AC converter DC / AC2, and also stores energy through the AC bus, and the hydrogen fuel cell converts hydrogen fuel chemical energy into electric energy and supplies power to the AC bus through the third DC / AC inverter.

[0051] Further, the medium and long-term energy storage module includes a Fischer-Tropsch synthesis system, a thermal power generating set connected with an output end of the Fischer-Tropsch synthesis system, a CO2 reduction device connected with an input end of the Fischer-Tropsch synthesis system, and a CO2 capture-storage device connected with an input end of the CO2 reduction device.

[0052] Specifically, the CO2 capture-storage device captures CO2 from flue gas or air and provides the CO2 to the CO2 reduction device, the CO2 reduction device reduces the CO2 into CO and delivers the CO to the Fischer-Tropsch synthesis system, the Fischer-Tropsch synthesis system prepares alkane fuel and alcohol fuel by Fischer-Tropsch synthesis reaction with CO and H2 as raw materials and provides the alkane fuel and the alcohol fuel to the thermal power generating set. The thermal power generating set is connected with the AC bus through a second AC / AC converter AC / AC2 and supplies power to the AC bus.

[0053] Further, the hydrogen energy comprehensive utilization module comprises an air separation device, an ammonia synthesis system, a hydrogen refueling station, and a methanol preparation system. The high-pressure hydrogen storage tank provides H2 for the ammonia synthesis system, the hydrogen refueling station, and the methanol preparation system, the air separation device provides N2 for the ammonia synthesis system, and the CO2 capture-storage device and the CO2 reduction device provide CO2 and CO, respectively, for the methanol preparation system.

[0054] Further, the comprehensive energy system further comprises a grid-connected module electrically connected to the medium-and-long-term energy storage module through an alternating current bus, and a power monitoring control module for monitoring wind power P w , photovoltaic power P PV , system load P L , grid load P grid , hydrogen production station power P EL , energy storage power station state of charge SOC BES , energy storage power station power P BES , hydrogen fuel cell power P FC , and thermal power generator set power P Gen , so that the system power output follows the load demand. The system load P L includes the power demand of a hydrogen compressor, a high-pressure hydrogen storage tank, a CO2 capture-storage device, a Fischer-Tropsch synthesis system, an ammonia synthesis system, a hydrogen refueling station, a methanol preparation system, and an air separation device. The grid-connected module comprises a power grid and a third AC / AC converter AC / AC3 electrically connected to the alternating current bus, and the power grid can supply power to the alternating current bus through the third AC / AC converter AC / AC3, and also can obtain power from the alternating current bus through the third AC / AC converter AC / AC3.

[0055] In specific implementation, the Fischer-Tropsch synthesis system in the medium-and-long-term energy storage module uses syngas (CO and H2) as raw material to prepare alkane fuel and alcohol fuel through Fischer-Tropsch synthesis reaction, and converts renewable energy into chemical energy for long-term storage. The thermal power generator set is only used for system black start and does not participate in system output adjustment at ordinary times. When the wind-solar-hydrogen multi-energy complementary comprehensive energy system is off-grid due to failure and the hydrogen reserve is insufficient, all modules are powered off, the thermal power generator set is started to charge the energy storage power station and supply power to the power monitoring control module, and then expands to the grid-connected module. Wind-solar power generation and power purchase from the power grid are used to restore power supply to the hydrogen production module and the fuel cell module, so as to realize the restoration of the entire system.

[0056] The aforementioned integrated energy system based on wind, solar, hydrogen, and storage multi-energy complementarity includes: a hydrogen storage and transportation module, a wind-solar coupled power generation system, and a short-term energy storage system, a medium- and long-term energy storage module, and a hydrogen energy comprehensive utilization module connected to the output end of the hydrogen storage and transportation module. The wind-solar coupled power generation system inputs the produced hydrogen into the hydrogen storage and transportation module. The hydrogen storage and transportation module then sends the stored H2 to the short-term energy storage system for short-term energy storage, to the medium- and long-term energy storage module for medium- and long-term energy storage, and to the hydrogen energy comprehensive utilization module to react with CO and CO2 input from the medium- and long-term energy storage module to produce methanol. Compared to existing technologies, this invention enhances the power supply side's flexible adjustment capability by utilizing energy storage power stations, electrolytic hydrogen production to absorb renewable energy power, and leveraging energy storage power stations and fuel cells for flexible power supply, thus meeting practical application needs.

[0057] Please see Figure 3 The present invention also provides a control method for an integrated energy system based on wind, solar, hydrogen, and storage multi-energy complementarity, applicable to the aforementioned integrated energy system based on wind, solar, hydrogen, and storage multi-energy complementarity. The method includes steps S11 to S12:

[0058] Step S11: Obtain the wind power P of the integrated energy system within a natural day. w Photovoltaic power P PV System load P L Power grid load P grid and its corresponding power and P s =P w +P PV -P L -P grid .

[0059] Step S12, based on the power and P s Hydrogen production station power P EL State of Charge (SOC) of energy storage power stations BES Energy storage power station P BES and hydrogen fuel cell power P FC The previous relationships determine the operating mode of the integrated energy system; the operating mode of the integrated energy system includes prioritizing the use of electrolytic hydrogen production to consume renewable energy electricity and prioritizing the use of energy storage power station electricity. In the context of prioritizing the use of electrolytic hydrogen production to consume renewable energy electricity, the power and P... s When the power and P are greater than zero, and the power from the energy storage station is used preferentially, the power and P are mentioned above. s Less than zero. That is, as shown in the image. Figure 4 As shown, when the supply of wind and solar power exceeds demand (P) s When the output of wind and solar power is greater than 0, priority should be given to using electrolysis to produce hydrogen to consume renewable energy power, followed by charging energy storage power stations, and then curtailing wind and solar power; when the output of wind and solar power is insufficient to meet demand (P... sWhen the power supply is less than 0, energy storage power stations should be used first, followed by hydrogen fuel cells, and then the grid frequency regulation units should be required to increase their output.

[0060] Specifically, when prioritizing the use of electrolysis to produce hydrogen to utilize renewable energy power, the method includes:

[0061] Mode 1 (Hydrogen production station operating at rated capacity, wind and solar power curtailment): When the system meets the requirements... At that time, the hydrogen production station was operating at its rated state, P EL =P EL_max State of charge (SOC) of energy storage power station BES At maximum SOC BES_max Entering shutdown state P BES =0, and the first operating mode of curtailing wind and solar power is adopted to maintain the power balance of the system;

[0062] Mode 2 (hydrogen production station operating at rated capacity, energy storage station charging): When the system meets the requirements... At that time, the hydrogen production station was operating at its rated state, P EL =P EL_max The remaining power P of the energy storage power station's absorption system BES =P s -P EL_max When the energy storage power station's state of charge (SOC) BES Rise to maximum SOC BES_max When the battery is fully charged, the system switches from the current second operating mode to the first operating mode.

[0063] Mode 3 (Routine Operation of Hydrogen Production Station): When the system meets P EL_mmin ≤P s ≤P EL_max At that time, the remaining power P of the hydrogen production station's consumption system EL =P s Then, proceed with the third operating mode;

[0064] Mode 4 (Hydrogen production station operates at minimum output, energy storage station discharges): When the system meets the requirements... At that time, the hydrogen production station operates at its minimum output P EL =P EL_min Power deficit P of energy storage power station discharge compensation system BES =P EL_mmin -P s During this period, the state of charge (SOC) of the energy storage power station BES Continuously decreasing, when SOC BES Reduce to minimum SOC BES_min At this time, the system switches from the current fourth operating mode to the fifth operating mode;

[0065] Mode 5 (Hydrogen production station shuts down, energy storage station charges): When the system meets the requirements... When the hydrogen station is in a shutdown state, the energy storage power station charges to absorb the remaining power P BES = P s During this period, the state of charge SOC BES of the energy storage power station is constantly rising, and when the SOC BES rises to the maximum value SOC BES_max , the system switches from the current fifth operating mode to the fourth operating mode.

[0066] When the energy storage power station power is preferentially used, the method comprises:

[0067] Mode 6 (energy storage power station rated power discharge, grid frequency modulation unit increased output): when the system satisfies , the hydrogen fuel cell is shut down, the energy storage power station discharges at a rated power P BES = P BES_max , and the sixth operating mode of using the grid frequency modulation unit to increase the output is adopted to maintain system power balance;

[0068] Mode 7 (energy storage power station rated power discharge, hydrogen fuel cell normal operation): when the system satisfies , the energy storage power station discharges at a rated power P BES = P BES_max , the hydrogen fuel cell compensates for the system power shortage P FC = |P s | - P BES_max , and the seventh operating mode is operated;

[0069] Mode 8 (energy storage power station discharge): when the system satisfies P BES_min ≤ |P s | ≤ P BES_max , the energy storage power station discharges to compensate for the system power shortage P BES = |P s |, the hydrogen fuel cell is shut down, and the eighth operating mode is operated:

[0070] Mode 9 (hydrogen fuel cell normal operation): when the system satisfies P FC_min ≤ |P s | < P BES_mmin , the hydrogen fuel cell compensates for the system power shortage P FC_min = |P s |, and the ninth operating mode is operated;

[0071] Mode 10 (hydrogen fuel cell minimum output operation, energy storage power station charging): when the system satisfies , the hydrogen fuel cell operates at a minimum output P FC = P FC_min , and the energy storage power station charges to absorb the remaining power P BES = P FC_min - |Ps | Then, proceed with the tenth operating mode.

[0072] The meanings of each symbol are as follows: P w P represents wind power output. PV P represents photovoltaic power. L P represents the system load. grid P represents the grid load. s Indicates wind power P w Photovoltaic power P PV System load P L Power grid load P grid The algebraic sum, |P s | Represents wind power P w Photovoltaic power P PV System load P L Power grid load P grid The absolute value of the algebraic sum, P EL Indicates the power output of the hydrogen production station, SOC BES P represents the state of charge of the energy storage power station. BES P represents the power of the energy storage power station. FC This indicates the power of the hydrogen fuel cell; in the subscripts, EL, BES, and FC represent hydrogen production station, energy storage power station, and hydrogen fuel cell, respectively, and max and min represent the maximum and minimum values, respectively.

[0073] For example, please refer to Figure 5 As shown in Table 1, in a multi-energy complementary system based on wind, solar, hydrogen, and storage, the installed capacity of the wind power system is 120MW, the installed capacity of the photovoltaic power system is 80MW, the installed capacity of the hydrogen production station is 60MW (minimum operating power 6MW), the installed capacity of the energy storage station is 20MW (minimum operating power 0.2MW), and the installed capacity of the hydrogen fuel cell is 10MW (minimum operating power 1MW). The system's wind power output P within a natural day... w Photovoltaic power P PV System load P L Power grid load P grid and its algebraic sum P s Hydrogen production station power P EL Energy storage power station P BES (Charging is positive, discharging is negative), State of Charge (SOC) of energy storage power station BES Hydrogen fuel cell power P FC The corresponding operating modes are shown in the table below. From 1 AM to 8 AM, the wind power P... w Photovoltaic power P PV System load P L Power grid load P grid Algebraic sum of P sgreater than zero, indicating that at this time when the wind and light power supply is in excess of demand, the electrolytic hydrogen production is preferred to consume renewable energy power. s greater than the minimum operating power of the hydrogen production station and less than the rated power, that is, P EL_minn < P s < P EL_max According to Figure 5 , the system should be operated in the third operating mode 3, and the hydrogen production station consumes the remaining power P EL = P s At 9 o'clock, the algebraic sum P w of the wind power P PV , the photovoltaic power P L , the system load P grid and the grid load P s is still greater than zero, but P s is less than the minimum operating power P EL_minn (6 MW) of the hydrogen production station, that is, 0 < P s < P EL_min , and the state of charge SOC BES of the energy storage power station is SOC BES_max , according to Figure 5 , the system should be operated in the fifth operating mode 5, the hydrogen production station is shut down, and the energy storage power station is charged to consume all the excess power P BES = P s At 10 o'clock, the algebraic sum P w of the wind power P PV , the photovoltaic power P L , the system load P grid and the grid load P s is greater than the minimum operating power and less than the rated power of the hydrogen production station, that is, P EL_min < P s < P EL_max , according to Figure 5 , the system should be operated in the third operating mode 3, and the hydrogen production station consumes the remaining power P EL = P s From 11 o'clock to 14 o'clock, the algebraic sum P w of the wind power P PV , the photovoltaic power P L , the system load P grid and the grid load P s is greater than the rated power P EL_max of the hydrogen production station, and the state of charge SOC BES of the energy storage power station is SOC BES_max , according to Figure 5 , the system should be operated in the second operating mode 2, the hydrogen production station is operated at rated power P EL = P EL_max , and the energy storage power station is charged to consume the remaining power P BES = Ps -P EL_max Between 3 PM and 4 PM, the wind power output P... w Photovoltaic power P PV System load P L Power grid load P grid Algebraic sum of P s The power output is greater than the minimum operating power of the hydrogen production station but less than the rated power, i.e., P EL_min <P s <P EL_max ,according to Figure 5 It can be seen that the system should operate in the third operating mode 3, and the hydrogen production station should consume the remaining power P of the system. EL =P s At 5 PM, the wind power P w Photovoltaic power P PV System load P L Power grid load P grid Algebraic sum of P s A value less than zero indicates that when wind and solar power output cannot meet demand, energy storage power stations are prioritized to compensate for the insufficient output. The absolute value of the algebraic sum |P s | Greater than the minimum operating power of the energy storage power station but less than the rated power, i.e., P BES_min <|P s |<P BES_max ,according to Figure 5 It can be seen that the system should operate in the eighth operating mode, with the energy storage power station discharging to provide the shortfall power P. BES =|P s At 6 PM, the wind power P... w Photovoltaic power P PV System load P L Power grid load P grid Algebraic sum of P s Less than zero, the absolute value of the algebraic sum |P s |greater than the rated operating power of the energy storage power station, i.e., |P s |>P BES_max Moreover, |P s | greater than the sum of the rated power of the energy storage power station and the minimum operating power of the hydrogen fuel cell, i.e., |P s |≥P BES_max +P FC_min ,according to Figure 5 It can be determined that the system should operate in the seventh operating mode, and the rated power discharge P of the energy storage power station should be used. BES =P BES_max The power deficit P of the hydrogen fuel cell compensation system FC =|P s |-P BES_max Between 7 PM and midnight, wind power P w Photovoltaic power PPV , system load P L , grid load P grid , algebraic sum P s greater than the minimum operating power of the hydrogen production station and less than the rated power, i.e. P EL_min <P s <P EL_max , according to ​ , the system should be operated in the third operating mode 3, the hydrogen production station absorbs the remaining power P EL =P s .

[0074] Table 1 Control strategy of the integrated energy system based on wind-solar-hydrogen-storage multi-energy complementary

[0075]

[0076]

[0077] In summary, the Fischer-Tropsch synthesis system in the medium and long-term energy storage module of the application uses syngas (CO and H2) as raw material to prepare alkane fuel and alcohol fuel through Fischer-Tropsch synthesis reaction, which converts renewable energy into long-term chemical energy storage. The thermal power generating unit is only used for system black start and does not participate in system output adjustment at ordinary times. When the wind-solar-hydrogen-storage multi-energy complementary integrated energy system is off-grid due to failure and the hydrogen reserve is insufficient, all modules are powered off, the thermal power generating unit is started to charge the energy storage power station and provide power for the power monitoring and control module, and then it is expanded to the grid-connected module. By using wind and solar power generation and purchasing power from the grid, the power supply of the hydrogen production module and the fuel cell module is restored, so as to realize the recovery of the entire system.

[0078] It should be understood that although each step in the above flowchart is displayed in sequence according to the direction of the arrow, these steps are not necessarily executed in the order indicated by the arrow. Unless otherwise specified herein, there is no strict order limitation for the execution of these steps, and these steps can be executed in other orders. Moreover, at least part of the steps in the above flowchart can include multiple sub-steps or multiple stages, which are not necessarily executed at the same time, but can be executed at different times, and the execution order of these sub-steps or stages is not necessarily sequential, but can be executed in rotation or alternation with at least part of other steps or sub-steps or stages of other steps.

[0079] The integrated energy system control method based on wind-solar-hydrogen-storage multi-energy complementary provided by the embodiment of the application is suitable for the above-mentioned integrated energy system based on wind-solar-hydrogen-storage multi-energy complementary, and the method comprises obtaining the wind power P w , photovoltaic power P PV , system load P L, grid load P grid and its corresponding power and P s = P w + P PV - P L - P grid ; according to the power and P s , hydrogen production station power P EL , energy storage station state of charge SOC BES , energy storage station power P BES and hydrogen fuel cell power P FC determine the working mode of the integrated energy system before the relationship; the working mode of the integrated energy system includes preferentially using electrolytic hydrogen production to consume renewable energy power and preferentially using energy storage station power, wherein when the electrolytic hydrogen production is preferentially used to consume renewable energy power, the power and P s is greater than zero, and when the energy storage station power is preferentially used, the power and P s is less than zero. Compared with the prior art, the present application obtains enhanced power side flexible adjustment capability by energy storage station, electrolytic hydrogen production for renewable energy power consumption and flexible power supply using energy storage station and fuel cell, which meets the actual application requirement.

[0080] The embodiment of the present application also provides a computer readable storage medium, which comprises a stored computer program; wherein the computer program controls the device where the computer readable storage medium is located to execute the integrated energy system control method based on wind-solar-hydrogen-storage multi-energy complementation as described above when running.

[0081] The embodiment of the present application also provides a terminal device, which comprises a processor, a memory and a computer program stored in the memory and configured to be executed by the processor, and the processor realizes the integrated energy system control method based on wind-solar-hydrogen-storage multi-energy complementation as described above when executing the computer program.

[0082] Preferably, the computer program can be divided into one or more modules / units (such as computer program 1, computer program 2, …), which are stored in the memory and executed by the processor to complete the present application. The one or more modules / units can be a series of computer program instruction segments capable of completing a specific function, which are used to describe the execution process of the computer program in the terminal device.

[0083] The processor can be a central processing unit (CPU), and can also be other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor, or the processor can also be any conventional processor. The processor is a control center of the terminal device, and connects various parts of the terminal device through various interfaces and lines.

[0084] The memory mainly includes a program storage area and a data storage area. The program storage area can store an operating system, at least one application required by a function, etc., and the data storage area can store related data, etc. In addition, the memory can be a high-speed random access memory, and can also be a non-volatile memory such as a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash card, etc., or the memory can also be other volatile solid-state storage devices.

[0085] It should be noted that the terminal device described above can include, but is not limited to, the processor and the memory. Those skilled in the art can understand that the terminal device can also include more or fewer components, or combine certain components, or different components.

[0086] The above description is only the preferred embodiments of the present application. It should be noted that those skilled in the art can make several improvements and modifications without departing from the technical principles of the present application. These improvements and modifications should also be considered as falling within the protection scope of the present application.

Claims

1.A method for controlling a comprehensive energy system based on wind-solar-hydrogen storage multi-energy complementation, characterized in that, The application is suitable for a comprehensive energy system based on wind-solar-hydrogen storage multi-energy complementation, which comprises a hydrogen storage and transportation module, a wind-solar coupling power generation system, and a short-term energy storage system, a medium and long-term energy storage module and a hydrogen energy comprehensive utilization module connected with the output end of the hydrogen storage and transportation module; the prepared hydrogen is input into the hydrogen storage and transportation module by the wind-solar coupling power generation system, the stored and transported H2 is sent into the short-term energy storage system for short-term energy storage, sent into the medium and long-term energy storage module for medium and long-term energy storage, and sent into the hydrogen energy comprehensive utilization module to react with the input CO and CO2 of the medium and long-term energy storage module for methanol preparation; the wind-solar coupling power generation system comprises a wind power generation system, a photovoltaic power generation system and a hydrogen production station; the short-term energy storage system comprises an energy storage power station and a hydrogen fuel cell; the method comprises the following steps: Obtain the wind power output of the integrated energy system within a natural day. Photovoltaic power System load Power grid load and its corresponding power and The ; According to the power and , hydrogen production station power , energy storage power station state of charge , energy storage power station power , and hydrogen fuel cell power The previous relationship determines the working mode of the integrated energy system; the working mode of the integrated energy system includes preferentially adopting electrolytic hydrogen production to consume renewable energy power and preferentially adopting energy storage power station power, wherein when electrolytic hydrogen production is preferentially adopted to consume renewable energy power, the power and Is greater than zero, and when energy storage power station power is preferentially adopted, the power and Is less than zero; When electrolytic hydrogen is preferentially used to accommodate renewable energy power, the method comprises: When the system meets , the hydrogen production station operates in the rated state, , the state of charge of the energy storage power station is at the maximum , the energy storage power station enters the shutdown state = 0, the first operation mode of abandoning wind and light is adopted to maintain system power balance; When the system meets , the hydrogen production station operates in a rated state, and the hydrogen production station power adopts the maximum power, , the energy storage power station absorbs the remaining power of the system, and at this time the remaining power of the system is the energy storage power station power , , when the state of charge of the energy storage power station rises to a maximum value , the battery is fully charged, and the system switches from the current second operating mode to the first operating mode; When the system satisfies , the hydrogen production station absorption system absorbs the remaining power of the system, at which time the remaining power of the system is the hydrogen production station power , , the third operation mode is performed. When the system satisfies , the hydrogen production station power adopts the minimum power, , the energy storage power station discharges to compensate for the power shortage, at which time the system power shortage is the energy storage power station power , , the state of charge of the energy storage power station continuously decreases, and when drops to the minimum value , the system switches from the current fourth operating mode to the fifth operating mode; When the system satisfies , the hydrogen production station is in a shutdown state, the energy storage power station charges to absorb the remaining power of the system, and the remaining power of the system is the power of the energy storage power station , , and the state of charge of the energy storage power station continuously rises, and when rises to a maximum value , the system is switched from the current fifth operating mode to the fourth operating mode. 2.The control method of the integrated energy system based on wind-solar-hydrogen storage multi-energy complementation according to claim 1, characterized in that, When energy storage power station power is preferentially used, the method comprises: When the system meets , the hydrogen fuel cell stops, and the energy storage power station discharges at rated power, , the sixth operation mode of increasing the output of the grid frequency regulation unit is adopted to maintain the power balance of the system. When the system meets , the energy storage power station discharges rated power, , the hydrogen fuel cell compensates for the system power shortage, and the system power shortage is the energy storage power station power , , the seventh operation mode is operated. When the system satisfies , the energy storage power station discharges to compensate for the power shortage of the system, at which time the system power shortage is the energy storage power station power , , the hydrogen fuel cell is shut down, and the eighth operating mode is operated. When the system satisfies , the hydrogen fuel cell compensates for the system power shortage, where the system power shortage is the hydrogen fuel cell power , , the ninth operating mode is performed. When the system meets , the hydrogen fuel cell runs at minimum power , the energy storage power station charges and absorbs the remaining power of the system, and the system power remaining power is the energy storage power station power , , the tenth running mode is run.

Images