CN112269964B - Hydrogen energy system power capacity calculation method based on double-step function - Google Patents
Hydrogen energy system power capacity calculation method based on double-step function Download PDFInfo
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Abstract
A hydrogen energy system power capacity calculation method based on a double-step function. Firstly, establishing a wind power annual output total quantity model and a wind power annual output average value model, then establishing a wind power annual output total quantity equivalent model according to a double-step function theory, then calculating an annual minimum output duration factor, establishing a hydrogen energy system power capacity calculation model, and finally solving the capacity calculation model by combining wind power output data to obtain a hydrogen energy system power capacity calculation result. The invention can greatly reduce the calculation complexity of the power capacity of the hydrogen energy system and improve the adaptability of the hydrogen energy system to wind power output fluctuation.
Description
Technical Field
The invention relates to a power capacity calculation method of a hydrogen energy system.
Background
With the wide access of large-scale renewable energy sources in the power grid, the randomness, intermittence and fluctuation of power generation of the renewable energy sources can bring serious challenges to the safe operation of the power grid. The energy storage can play roles in stabilizing fluctuation, peak clipping, valley filling and the like, and is beneficial to solving a series of problems caused by renewable energy grid connection. However, the conventional energy storage technology cannot meet the requirements of large-scale energy storage and future green energy development, and has high cost. In recent years, due to the development of hydrogen production technology and breakthrough of proton exchange membrane fuel cell technology (PEMFC), large-scale safe grid connection change of wind power is possible depending on the traditional energy storage technology. Hydrogen gas provides a "balance" between electricity production and supply, and is the best choice as an energy storage medium; the water electrolysis device has strong adaptability to the unstable power output of the fan; PEMFCs are the best energy conversion devices for hydrogen-electricity. Meanwhile, the PEMFC has the advantages of no pollution, high energy conversion efficiency, long service life of the battery, good stability, zero emission and the like. Further, the equivalent charge and discharge process of the hydrogen energy storage technology is as follows: the process realizes the mass storage and controllability of wind power.
In view of the characteristics of randomness, fluctuation and the like of the self-adaptive wind power in the rated power range of 0-100%, the hydrogen energy storage system almost has the advantages of power type and energy type energy storage technology applied to the wind power field. Therefore, it is necessary to purposefully study the key technical problems such as the capacity calculation method of the hydrogen energy system.
Disclosure of Invention
The invention provides a hydrogen energy system power capacity calculation method based on a double-step function, which is based on a double-step function load model, can greatly reduce the calculation complexity of the hydrogen energy system power capacity and improve the adaptability to wind power output fluctuation during the configuration of the hydrogen energy system power capacity.
The invention adopts the following technical scheme:
a hydrogen energy system power capacity calculation method based on a double-step function comprises the following steps:
1) Establishing a wind power annual output total quantity model and a wind power annual output average model;
2) Establishing a wind power annual output total equivalent model according to a double-step function theory;
3) Calculating a annual minimum output duration factor;
4) Establishing a power capacity calculation model of the hydrogen energy system;
5) And (3) solving the model in the step (4) by adopting Matlab in combination with wind power output data to obtain a power capacity calculation result of the hydrogen energy system.
In the step (1) of the above-mentioned process,
the total annual wind power output model is shown as (1):
the annual output average model of wind power is shown as (2):
wherein: e (E) Y P is the annual output total amount of wind power W,av Is the annual output average value of wind power, P W (t) is the output value of t hours in one year of wind powerTotal annual wind power output E Y Annual output average value P of wind power W,av And the output value P of t hours in one year of wind power W (T) can be obtained directly from local monitoring data or through random production simulation, T is 8760 hours per year, and Δt is the minimum unit time interval of 1h.
In the step 2), the maximum value and the minimum value in the load curve are firstly selected by the double-step load model, then the duration time of the maximum load and the minimum load is respectively given for equivalent total load consumption, in addition, the sum of the duration time of the maximum load and the minimum load is equal to the number of hours in the whole year, and finally the duration time of the maximum load and the minimum load is calculated.
The load in the double-step load model is replaced by wind power output, and the equivalent model of the annual wind power output total amount is shown in the formula (3):
wherein: p (P) W,min 、P W,max Respectively a minimum output valley value in the wind power year and a maximum output peak value in the year,respectively minimum and maximum duration of output in wind power year, and there is +.>
In the step 3) of the above-mentioned process,
annual minimum force duration factor gamma Y The definition expression is shown as formula (4):
by combining the formula (3) and the formula (4), the wind power annual output average value expression can be rewritten as shown in the formula (5):
P W,av ＝P W,min γ Y +P W,max (1-γ Y ) (5)
finishing to obtain gamma Y The calculation expression is shown in the formula (6):
wherein: gamma ray Y For a annual minimum output duration factor,respectively minimum output duration and maximum output duration in wind power year, and there is +.>T is 8760 hours per year, P W,min 、P W,max 、P W,av The wind power output power generation method is characterized in that the wind power output power generation method is respectively a minimum output valley value in the wind power year, a maximum output peak value in the year and an annual output average value.
In the step 4) of the above-mentioned process,
the power capacity calculation model of the hydrogen energy system is shown as (7):
wherein: p (P) HES For hydrogen energy system power capacity, gamma Y To be annual minimum output duration factor, P W,min 、P W,max 、P W,av The wind power output power generation method is characterized in that the wind power output power generation method is respectively a minimum output valley value in the wind power year, a maximum output peak value in the year and an annual output average value.
In the step 5) of the above-mentioned method,
the wind power output data is generated power data of a target place wind turbine generator system in a certain whole year, the time resolution is 1h, and the total annual duration is 8760h.
In general, the invention has the following beneficial technical effects:
according to the method, a calculation method of the power capacity of the hydrogen energy system is formulated based on a double-step function load model theory, the fluctuation and lower predictability of wind power output are comprehensively considered, the power capacity of the hydrogen energy system which is in butt joint with wind power can be obtained quickly and simply, the calculation complexity of the power capacity of the hydrogen energy system can be effectively reduced, and the adaptability of the hydrogen energy system to wind power output fluctuation can be improved.
Drawings
FIG. 1 is a flow chart of the method of the present invention;
FIG. 2 shows the wind power output condition in a certain year.
Detailed Description
The embodiment provides a hydrogen energy system power capacity calculation method based on a double-step function, which specifically comprises the following steps:
the wind power output condition for a certain year is shown in figure 2. According to the situation of giving the wind power output of a certain year shown in fig. 2, the method for calculating the power capacity of the hydrogen energy system based on the double-step function is as follows:
1) Establishing a wind power annual output total quantity model and a wind power annual output average model;
the total annual wind power output model is shown as (1):
the annual output average model of wind power is shown as (2):
P W and (T) is the output value of T hours in one year of wind power, as shown in fig. 2, T is 8760 hours per year, and Δt is the minimum unit time interval of 1h.
E is calculated from the formulas (1) and (2) Y 、P W,av And 15189840MW, 1734MW, respectively.
2) Establishing a wind power annual output total equivalent model according to a double-step function theory;
the equivalent model of the annual output total amount of wind power is shown as (3):
as can be taken from fig. 2, P W,min 、P W,max 177MW and 5185MW, respectively.
Calculated according to the model6036.5 and 2723.5, respectively.
3) Calculating a annual minimum output duration factor;
annual minimum force duration factor gamma Y The definition expression is shown as formula (4):
by combining the formula (3) and the formula (4), the wind power annual output average value expression can be rewritten as shown in the formula (5):
P W,av ＝P W,min γ Y +P W,max (1-γ Y ) (5)
finishing to obtain gamma Y The calculation expression is shown in the formula (6):
calculation of gamma from the expression Y 0.6891.
4) And establishing a power capacity calculation model of the hydrogen energy system.
The power capacity calculation model of the hydrogen energy system is shown as (7):
wherein: p (P) HES Is the power capacity of the hydrogen energy system.
5) And solving by adopting a Matlab capacity calculation model in combination with wind power output data to obtain a power capacity calculation result of the hydrogen energy system. The final hydrogen energy system power capacity calculation was 1612MW.
Claims (3)
1. The method for calculating the power capacity of the hydrogen energy system based on the double-step function is characterized by comprising the following steps of:
1) Establishing a wind power annual output total quantity model and a wind power annual output average model;
2) Establishing a wind power annual output total equivalent model according to a double-step function theory;
3) Calculating a annual minimum output duration factor;
4) Establishing a power capacity calculation model of the hydrogen energy system;
5) Solving the model in the step 4) by adopting Matlab in combination with wind power output data to obtain a power capacity calculation result of the hydrogen energy system;
in the step (1) of the above-mentioned process,
the total annual wind power output model is shown as (1):
the wind power annual output average model is shown as (2):
wherein: e (E) Y P is the annual output total amount of wind power W,av Is the annual output average value of wind power, P W (T) is the output of wind power within one year for T hours, T is 8760 hours all the year, and Deltat is the minimum unit time interval of 1h;
in the step 2) of the above-mentioned process,
the equivalent model of the annual output total amount of wind power is shown as (3):
wherein: p (P) W,min 、P W,max Respectively a minimum output valley value in the wind power year and a maximum output peak value in the year,respectively minimum and maximum duration of output in wind power year, and there is +.>T is 8760 hours all the year round;
in the step 3) of the above-mentioned process,
the annual minimum output duration factor gamma Y The definition expression is shown as formula (4):
and (3) and (4) are combined, and the wind power annual output average value expression is rewritten as shown in the formula (5):
P W,av ＝P W,min γ Y +P W,max (1-γ Y ) (5)
finishing to obtain gamma Y The calculation expression is shown in the formula (6):
wherein: gamma ray Y For a annual minimum output duration factor,respectively minimum output duration and maximum output duration in wind power year, and there is +.>T is 8760 hours per year, P W,min 、P W,max 、P W,av Respectively is the minimum output valley value and the maximum output peak value in the wind power yearValue and annual output average;
in the step 4) of the above-mentioned process,
the power capacity calculation model of the hydrogen energy system is shown in a formula (7):
wherein: p (P) HES For hydrogen energy system power capacity, gamma Y To be annual minimum output duration factor, P W,min 、P W,max 、P W,av The wind power output power generation method is characterized in that the wind power output power generation method is respectively a minimum output valley value in the wind power year, a maximum output peak value in the year and an annual output average value.
2. The method for calculating the power capacity of the hydrogen energy system based on the double-step function according to claim 1, wherein in the step 5), the wind power output data is generated power data of a certain whole year of the wind turbine generator at the location of the target, the time resolution is 1h, and the total annual duration is 8760h.
3. The method for calculating the power capacity of the hydrogen energy system based on the double step function according to claim 1, wherein the power capacity of the hydrogen energy system is the power capacity of an electrolytic tank.
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| CN110970912A (en) * | 2019-12-09 | 2020-04-07 | 国网新疆电力有限公司 | Operation simulation method for new energy power system containing energy storage |
| CN111313480A (en) * | 2020-03-26 | 2020-06-19 | 中国华能集团清洁能源技术研究院有限公司 | Multi-objective optimization-based design method of multi-energy complementary system |
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| CN108206547A (en) * | 2018-01-08 | 2018-06-26 | 福州大学 | The method of wind hydrogen coupled electricity-generation system each unit capacity optimization |
| CN109741110A (en) * | 2019-01-07 | 2019-05-10 | 福州大学 | A kind of wind hydrogen system combined optimization modeling method based on chance constrained programming |
| CN110970912A (en) * | 2019-12-09 | 2020-04-07 | 国网新疆电力有限公司 | Operation simulation method for new energy power system containing energy storage |
| CN111313480A (en) * | 2020-03-26 | 2020-06-19 | 中国华能集团清洁能源技术研究院有限公司 | Multi-objective optimization-based design method of multi-energy complementary system |
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| 风电制氢技术现状及发展趋势;孙鹤旭 等;《电工技术学报》;第34卷(第19期);4071-4083 * |
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