Matching and charge-discharge control method for producing hydrogen by wind-solar power storage coupling combustion engine

Abstract

The invention provides a matching and charge-discharge control method for producing hydrogen by a wind-solar power storage coupling combustion engine, which combines power generation characteristics of a wind-solar power storage combined power station, automatically matches corresponding combustion engines and hydrogen production scales, and obtains charge-discharge control strategies at different moments in a corresponding year. The method comprises the following steps: (1) obtaining the generated power of the wind-solar combined power station at each moment in all hours of a year; (2) configuring an energy storage system with the installed capacity, and setting a minimum threshold value for allowing the energy storage system to discharge outwards; (3) setting the hydrogen production unit power consumption of each standard party; (4) setting a stable power point value of external stable power supply required by the wind-solar combined power station; (5) comparing the difference value between the generated power and the stable power point value of the wind-solar combined power station hourly; and (6) judging whether peak clipping or valley filling needs to be considered at a certain moment.

Description

Technical Field

[0001] The present invention relates to a matching and charge-discharge control method for hydrogen production by coupling a wind-solar-storage power system with a gas turbine. Background Art

[0002] In recent years, wind power and photovoltaic power stations have developed rapidly. Among them, a wind-solar-storage complementary power station is an integrated energy power generation facility that combines wind power generation and photovoltaic power generation.

[0003] Wind energy and solar energy are two major renewable energy sources, and they have significant complementarity. During periods with strong winds, wind power generation can play a major role; while during periods with sufficient sunlight, photovoltaic power generation becomes dominant. This complementarity enables the wind-solar combined power station to maintain a relatively stable power output under different weather conditions. By combining wind power and solar power generation and equipping with an energy storage system, the wind-solar-storage combined power station can significantly improve the stability of the power system. This helps to reduce power fluctuations, improve power quality, and reduce the operating risks of the power grid.

[0004] Although the wind-solar-storage combined power station has many advantages, it also has some disadvantages. The power generation efficiency of the wind-solar-storage combined power station is significantly affected by weather conditions. For example, in rainy or windless weather, the power generation efficiency of both wind energy and solar energy will drop significantly, thus affecting the power output of the entire power station. The uncertainty of such weather conditions makes the power output of the wind-solar combined power station fluctuate and be unstable. Although the energy storage system can alleviate the power output fluctuations and instability to a certain extent, the existing energy storage technologies still have certain limitations. For example, the capacity of battery energy storage is limited and is affected by factors such as battery life and safety. This limits the wide application and effectiveness of the energy storage system in the wind-solar combined power station. Summary of the Invention

[0005] The purpose of the present invention is to overcome the problem of insufficient stability of the power generation capacity of the existing wind-solar-storage combined power station, and provides a matching and charge-discharge control method for hydrogen production by coupling a wind-solar-storage power system with a gas turbine. Combining the power generation characteristics of the wind-solar-storage combined power station, it automatically matches the corresponding gas turbine and hydrogen production scale, and obtains the charge-discharge control strategies at different times of a year.

[0006] The technical solution adopted by the present invention to solve the above problems is: a matching and charge-discharge control method for hydrogen production by coupling a wind-solar-storage power system with a gas turbine, characterized in that it includes the following steps: (1) Obtain the power generation power of each moment of all hours of a year of the wind-solar combined power station, where the power generation power at a certain moment is P i ; (2) Configure an energy storage system with an installed capacity of P bset , and set the lowest threshold P bb for the energy storage system to allow external discharge; (3) Set the power consumption per standard cubic meter of hydrogen production, P Hunit ; (4) Set the stable power point value, P, of the wind-solar combined power station for stable external power supply set ; (5) Compare the hourly power generation, P, of the wind-solar combined power station i with the difference, ΔP, from the stable power point value, P set ; (6) For a certain moment: If ΔP ≥ 0, peak shaving needs to be considered, and the excess energy is preferentially sent to the energy storage system for storage. That is, the electrical energy stored in the energy storage system will become P bess ' = ΔP + P bess , where P bess is the existing power in the energy storage system before storing peak shaving energy, and P bess ' is the existing power in the energy storage system after storing peak shaving energy; If ΔP + P bess ≤ P bset , directly repeat the ΔP judgment process for the next moment; P bset is the installed capacity of the energy storage system; If ΔP + P bess > P bset , then a part of the energy in ΔP at this moment is stored in the energy storage system, and the other part is used for hydrogen production, and repeat the ΔP judgment process for the next moment; (7) For a certain moment: If ΔP < 0, valley filling needs to be considered, and the energy is preferentially taken from the energy storage system, and the insufficient part is filled by starting the gas turbine unit; If P bess ≤ P bb , start the gas turbine unit, and the power generation of the gas turbine is P f = |ΔP|, and the hydrogen production device is not started, and repeat the ΔP judgment process for the next moment; If P bess > P bb , judge whether the energy that can be released by the energy storage system can meet the gap of the wind-solar combined power station: If |ΔP| ≤ P bess - P bb , there is no need to start the gas turbine unit and the hydrogen production device, and repeat the ΔP judgment process for the next moment; If |ΔP| > P bess - P bb , the power filled by the energy storage system is: P bess - P bb , and the power filled by the gas turbine unit is: P f = |Pbess -P bb +ΔP|, at this time, the hydrogen production device does not start, and the ΔP judgment process for the next moment is repeated.

[0007] In the present invention, P bb has a value range of: (10% - 50%) × P bset .

[0008] In step (6) of the present invention, when ΔP + P bess > P bset , the power available for the hydrogen production part is ΔP bess = P bess ’ - P bset , and the hydrogen production amount is: P H = ΔP bess / P Hunit , and at this time, the power generation power P f of the gas turbine is 0.

[0009] After steps (6) and (7) of the present invention, the P H and P f values at different moments within one year can be obtained. After output, the working states and charge and discharge magnitudes of the energy storage system, gas turbine unit, and hydrogen production device at different moments within one year are obtained; where P H is the hydrogen production scale, and P f is the power generation power of the gas turbine.

[0010] In the data column of P H of the present invention within one year, it is set that only when the hydrogen production scales P H at at least two adjacent moments are not zero, the data is valid, that is, P Hn > 0 and P H(n+1) > 0, where n represents the nth moment within one year; then a larger value is output from P Hn and P H(n+1) and assigned to P He . After being assigned to P He , the next round of screening is entered until n = 8760, then the loop is exited, and the final P He is output as the installed capacity of the hydrogen production device.

[0011] In the data column of P f of the present invention within one year, a maximum value is output as the installed capacity of the gas turbine unit.

[0012] In step (1) of the present invention, the power generation power P of the wind - solar combined power station for 8760 hours in one year = {P1, P2,... P i ..., P 8760}.

[0013] In the present invention, i is a natural number representing hours, where 1 ≤ i ≤ 8760.

[0014] Compared with the prior art, the present invention has the following advantages and effects: (1) For the first time, wind power, photovoltaic power, electrochemical energy storage, gas turbine units, and hydrogen production devices are coupled with each other to give play to their respective advantages, achieve a synergy effect of 1 + 1 > 0, and contribute to the development of the country's green energy and chemical industry.

[0015] (2) By matching the electrochemical energy storage system and utilizing its fast response characteristics, the function of quickly frequency modulating the wind and photovoltaic power stations is achieved.

[0016] (3) By matching the gas turbine units and utilizing their stable power generation characteristics, the function of peak shaving for the wind and photovoltaic power stations is achieved.

[0017] (4) By matching the hydrogen production device and utilizing its continuously adjustable load characteristics, the utilization rate of the wind and photovoltaic power stations is increased, and the wind and light abandonment rates are reduced.

[0018] (5) In the early stage of the project, different installed capacity matches of wind power, photovoltaic power, electrochemical energy storage, gas turbine units, and hydrogen production devices that meet the requirements of the construction party can be quickly obtained, the reliability of the early-stage project plan is improved, the implementation speed of the early-stage project plan is accelerated, and the overall investment risk of the project is reduced.

[0019] (6) The operating strategies of the gas turbine units and hydrogen production devices for 8760 hours a year are obtained, giving priority to using the green electricity generated by wind power and photovoltaic power, using the power generation capacity of the gas turbine units as a secondary supplement, and minimizing the consumption of chemical energy as much as possible to meet the national policy of carbon reduction and emission reduction. Detailed implementation manners

[0020] The present invention will be further described in detail below through embodiments. The following embodiments are explanations of the present invention, and the present invention is not limited to the following embodiments.

[0021] A matching and charge-discharge control method for wind-solar-storage-electricity-coupled gas turbine hydrogen production includes the following steps: (1) According to the wind resources and light resources at the project location, combined with the installed capacities of wind power and photovoltaic power, the wind power generation power and photovoltaic power generation power for 8760 hours a year are obtained respectively, and these power generation powers are superimposed according to time. Let the power generation power of the wind-solar combined power station at a certain moment be P i , where i is a natural number representing hours, 1 ≤ i ≤ 8760, then the power generation power P of the wind-solar combined power station for 8760 hours a year = {P1, P2,... P i ..., P 8760}.

[0022] (2) Configure an installed capacity of P bsetEnergy storage system, set the minimum threshold P for the energy storage system to allow external power discharge bb , this value mainly considers factors such as the battery life and the safety margin of the wind-solar hybrid power station. For example, it can be selected within the range of (10% - 50%) × P bset , generally not less than 10% × P bset . The energy storage system is an electrochemical energy storage system.

[0023] (3) Set the power consumption per standard cubic meter of hydrogen production P Hunit , such as it can be set to 5 kWh / Nm 3 , this value can be set in combination with the latest development of hydrogen production technology.

[0024] (4) Set the stable power point value P for the wind-solar hybrid power station to stably supply power externally set .

[0025] (5) Starting from the first hour of 8760 hours in a year, compare the power generation power P of the wind-solar hybrid power station hour by hour i with the stable power point value P for external stable power supply set The difference ΔP between them, and assign it hour by hour according to time, that is, ΔP = P i - P set , where i takes values from 1 to 8760 one by one.

[0026] (6) For a certain moment: If ΔP ≥ 0, it means that the actual power generation capacity of the wind-solar hybrid power station at this moment exceeds the stable power point value P set , then peak shaving needs to be considered, and the extra energy is preferentially sent to the energy storage system for storage, that is, the electrical energy stored in the energy storage system will become P bess ’ = ΔP + P bess , where P bess is the existing power in the energy storage system before storing peak shaving energy, and P bess ’ is the existing power in the energy storage system after storing peak shaving energy; Judge the magnitude between ΔP + P after superimposing ΔP at this moment bess and the installed capacity P of the energy storage system bset : If ΔP + P bess ≤ P bset , it means that the peak shaving energy at this moment can be fully stored in the energy storage system, and at this time, it can directly repeat and enter the ΔP judgment process of the next moment; If ΔP + P bess > P bset, which means that the energy in the energy storage system is full at this moment, and not all of the peak shaving energy can be stored in the energy storage system. Therefore, at this moment, a part of the energy in ΔP is stored in the energy storage system, and the other part is used for hydrogen production. The power available for hydrogen production is ΔP bess =P bess ’-P bset , and the hydrogen production at this moment is: P H =ΔP bess / P Hunit , and the power generation power P of the gas turbine at this moment f is 0, and it repeats to enter the ΔP judgment process of the next moment.

[0027] (7) For a certain moment: If ΔP﹤0, which means that the actual power generation capacity of the wind-solar hybrid power station at this moment is lower than the stable power point value P set , then valley filling needs to be considered. The energy is preferentially taken from the energy storage system, and the insufficient part is filled by starting the gas turbine unit; If P bess ≤P bb , which means that the real-time energy in the energy storage system is insufficient at this moment and cannot discharge electricity to the outside. Then the gas turbine unit is immediately started. The power generation power of the gas turbine at this moment is P f =|ΔP|, and the hydrogen production device is not started at this moment, that is, P H =0, and it repeats to enter the ΔP judgment process of the next moment; If P bess >P bb , which means that the real-time energy in the energy storage system can discharge electricity to the outside at this moment, and it is judged whether the energy that the energy storage system can discharge can meet the gap of the wind-solar hybrid power station: If |ΔP|≤P bess -P bb , which means that the power gap of the wind-solar hybrid power station is completely filled by the discharge energy of the energy storage system, and the gas turbine unit does not need to be started. The power generation power of the gas turbine at this moment is P f =0, and the hydrogen production device is not started at this moment, that is, P H =0, and it repeats to enter the ΔP judgment process of the next moment; If |ΔP|>P bess -P bb , which means that the power gap of the wind-solar hybrid power station at this moment needs to be filled by the energy storage system and the gas turbine unit together. The power filled by the energy storage system is: P bess -P bb , and the power filled by the gas turbine unit is: P f =|P bess -P bb +ΔP|, and the hydrogen production device is not started at this moment, that is, P H=0, and repeat the ΔP judgment process at the next moment.

[0028] (8) After the above steps (6) and (7), we can get P at different times of 8760 hours in a year: H With P f After outputting the values, we can get the working status and charge and discharge size of the energy storage system, gas turbine unit and hydrogen production device at different times for 8760 hours a year.

[0029] (9) To improve the utilization rate of the hydrogen production device, the P H In the data column of , it is assumed that the data is valid only when the hydrogen production scale at at least two adjacent moments is not zero, that is, P Hn >0 and P H(n+1) >0, n represents the nth moment in a year, 1≤n≤8760; then from P Hn With P H(n+1) Output a larger value and assign it to P He , assigned to P He After that, it enters the next round of screening until n=8760, then it jumps out of the loop and outputs the final P He As the installed capacity of the hydrogen production device.

[0030] (10) In 8760 hours per year f Output a maximum value in the data column as the installed capacity of the gas turbine unit.

[0031] In addition, it should be noted that the shapes and names of the parts and components of the specific embodiments described in this specification may be different, and the above content described in this specification is only an example of the structure of the present invention. All equivalent changes or simple changes made based on the structure, features and principles described in the patent concept of the present invention are included in the protection scope of the patent of the present invention. Technicians in the technical field of the present invention can make various modifications or supplements to the specific embodiments described or replace them in a similar manner, as long as they do not deviate from the structure of the present invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. A matching and charge-discharge control method for hydrogen production by a combined wind-solar-storage power generation and gas turbine, characterized in that: including the following steps: (1) Obtain the power generation power at each moment of all hours in a year for a wind-solar combined power station, where the power generation power at a certain moment is P i ; (2)Configure the installed capacity to be P bset of the energy storage system, and set the lowest threshold P bb for the energy storage system to allow external power discharge; (3)Set the power consumption per standard cubic meter of hydrogen production unit P Hunit ; (4)Set the stable power point value P at which the wind-solar combined power station needs to supply stable power externally set ; (5)Compare the generated power P of the wind-solar hybrid power station hour by hour i with the stable power point value P set to obtain the difference ΔP therebetween; (6) For a certain moment: If ΔP ≥ 0, peak shaving needs to be considered. The extra energy is preferentially sent to the energy storage system for storage. That is, the electrical energy stored in the energy storage system will become P bess ’ = ΔP + P bess , where P bess is the existing power in the energy storage system before storing the peak shaving energy, and P bess ’ is the existing power in the energy storage system after storing the peak shaving energy; If ΔP + P bess ≤ P bset , directly repeat and enter the ΔP judgment process for the next moment; P bset is the installed capacity of the energy storage system; If ΔP + P bess > P bset , then a part of the energy in ΔP at this moment is stored in the energy storage system, and the other part is used for hydrogen production, and the ΔP judgment process for the next moment is repeated; (7) For a certain moment: If ΔP < 0, valley filling needs to be considered. The energy is preferentially taken from the energy storage system, and the insufficient part is filled by starting the gas turbine unit; If P bess ≤P bb , start the gas turbine unit, and the power generation of the gas turbine is P f =|ΔP|, the hydrogen production device does not start, and repeat to enter the ΔP judgment process at the next moment; If P bess > P bb , determine whether the energy that can be discharged by the energy storage system can meet the gap of the wind-solar hybrid power station: If |ΔP| ≤ P bess -P bb , there is no need to start the gas turbine unit and the hydrogen production device, and repeat the ΔP judgment process for the next moment; If |ΔP| > P bess -P bb , the power filled by the energy storage system is: P bess -P bb , the power filled by the gas turbine unit is: P f = |P bess -P bb + ΔP|. At this moment, the hydrogen production device does not start, and the ΔP judgment process for the next moment is repeated.

2. The matching and charge-discharge control method for hydrogen production by a wind-solar-storage-electricity-coupled gas turbine according to claim 1, wherein: P bb The value range of bb is: (10% - 50%) × P bset .

3. The matching and charge-discharge control method for hydrogen production by a wind-solar-storage-electricity-coupled gas turbine according to claim 1, characterized in that: In step (6), when ΔP + P bess >P bset the power available for the hydrogen production part is ΔP bess = P bess ’ - P bset , and the hydrogen production amount is: P H = ΔP bess / P Hunit . At this moment, the power generation power P f of the gas turbine is 0.

4. The matching and charge-discharge control method for hydrogen production by a wind-solar-storage-electricity-coupled gas turbine according to claim 1, wherein: After steps (6) and (7), the value of P at different times within one year can be obtained. After output, the working states and charge / discharge magnitudes of the energy storage system, gas turbine unit, and hydrogen production device at different times within one year can be obtained; where P H and P f value, after output, the working states and charge / discharge magnitudes of the energy storage system, gas turbine unit, and hydrogen production device at different times within one year can be obtained; where P H is the hydrogen production scale, and P f is the gas turbine power generation power.

5. The matching and charge-discharge control method for hydrogen production by a wind-solar-storage-electricity-coupled gas turbine according to claim 1, wherein: Among the data columns of P in one year H set that only when the hydrogen production scale P at least has two adjacent moments H is not zero, the data is valid, that is, P Hn > 0 and P H(n+1) > 0, where n represents the nth moment in a year; then output a larger value from P Hn and P H(n+1) and assign it to P He After assigning it to P He , enter the next round of screening until n = 8760, then jump out of the loop and output the final P He as the installed capacity of the hydrogen production device.

6. The matching and charge-discharge control method for hydrogen production by a wind-solar-storage-electricity-coupled gas turbine according to claim 1, characterized in that: Output a maximum value in the data column of P for one year as the installed capacity of the gas turbine unit. f ​ 7. The matching and charge-discharge control method for hydrogen production by a wind-solar-storage-electricity-coupled gas turbine according to claim 1, characterized in that: In step (1), the power generation power P of the wind-solar combined power station for 8,760 hours a year is P = {P1, P2, … P i …, P 8760}.

8. The matching and charge-discharge control method for hydrogen production by a wind-solar-storage-electricity-coupled gas turbine according to claim 1 or 7, characterized in that: where i is a natural number representing hours, and 1 ≤ i ≤ 8760.