Control method of wind generating set for hydrogen production

Abstract

The invention discloses a wind generating set control method for hydrogen production, which comprises the following steps of: acquiring real-time parameters of a wind generating set, and judging whether the wind generating set is in a power-limited operation state or not; if yes, the output power of the grid-side inverter is kept unchanged, the pitch angle target value of the wind generating set during rated operation of the hydrogen production electrolytic cell is calculated, and otherwise, the wind power generation income and the hydrogen production income are calculated respectively; judging whether the wind power generation income is greater than the hydrogen production income; if yes, the hydrogen production electrolytic cell operates at the minimum power, the pitch angle target value of the wind generating set is the optimal pitch angle, otherwise, the grid-side inverter outputs at the minimum power, and the pitch angle target value of the wind generating set during rated operation of the hydrogen production electrolytic cell is calculated. The target value of the pitch angle of the wind generating set is dynamically adjusted according to the real-time state of the wind generating set, so that continuous operation of the hydrogen production electrolytic cell is guaranteed, the utilization rate of electric energy is increased, and the benefit of a wind power hydrogen production system is increased.

Description

Technical Field

[0001] The present invention belongs to the technical field of wind power generation, and in particular relates to a control method of a wind power generator set for producing hydrogen. Background Art

[0002] In recent years, with the increase in wind power installed capacity and technological progress, wind power hydrogen production projects have begun to achieve commercial operation, and the production and application scale of hydrogen energy have continued to expand; and wind power hydrogen production, as a clean and efficient energy conversion method, is in line with the current global energy transformation trend. However, there are also some problems with the use of wind power for hydrogen production. The volatility of wind power poses a challenge to the stable operation and hydrogen quality of water electrolysis hydrogen production equipment, and hydrogen production equipment has high requirements for the stability of electric energy. Frequent power fluctuations will affect the life of hydrogen production equipment and the purity of hydrogen; in addition, the intermittent and uncontrollable nature of wind power also brings difficulties to grid dispatching, increasing the cost of grid balancing. Summary of the invention

[0003] In order to overcome the defects of the prior art, the present invention provides a wind turbine generator control method for producing hydrogen, which can ensure the continuous operation of the hydrogen production electrolyzer and improve the profit.

[0004] The object of the present invention is achieved through the following technical solutions:

[0005] A wind turbine generator control method for producing hydrogen comprises the following steps:

[0006] Collect real-time parameters of wind turbines;

[0007] According to the real-time parameters of the wind turbine generator set, determine whether the wind turbine generator set is in a limited power operation state; if the wind turbine generator set is in a limited power operation state, keep the output power of the grid-side inverter unchanged, and calculate the target value of the pitch angle of the wind turbine generator set when the hydrogen production electrolyzer is in rated operation;

[0008] If the wind turbine generator set is not in the power-limited operation state, the wind power generation income and hydrogen production income are calculated separately;

[0009] Determine whether the wind power generation income is greater than the hydrogen production income; if the wind power generation income is greater than the hydrogen production income, the hydrogen production electrolyzer operates at the minimum power, and the target value of the pitch angle of the wind turbine generator set is the optimal pitch angle;

[0010] If the revenue from wind power generation is not greater than the revenue from hydrogen production, the grid-side inverter will output at minimum power and calculate the target pitch angle of the wind turbine when the hydrogen production electrolyzer is operating at rated speed.

[0011] The beneficial effect of adopting the above technical solution is that the wind turbine control method dynamically adjusts the target value of the pitch angle of the wind turbine according to the real-time status of the wind turbine to ensure the continuous operation of the hydrogen production electrolyzer and improve the utilization rate of electric energy, thereby increasing the income of the wind power hydrogen production system.

[0012] In one embodiment, the calculation formula for wind power generation revenue is:

[0013]

[0014] Among them, V 1 is the wind power generation income, d is t 1 ~t 2 The real-time on-grid electricity price during this period is P total t 1 ~t 2 The total power generation during this period.

[0015] In one embodiment, the calculation formula of hydrogen production revenue is:

[0016] V 2 =e·T total (t 1 ,t 2 )-V loss

[0017] Among them, V 2 is the hydrogen production income, e is the hydrogen market price, T total t 1 ~t 2 The total hydrogen production during this period, V loss The fixed input costs for hydrogen production and storage.

[0018] In one embodiment, collecting real-time parameters of a wind turbine generator set includes:

[0019] Collect the main status of the fan;

[0020] According to the real-time parameters of the wind turbine generator set, judging whether the wind turbine generator set is in a power-limited operation state includes:

[0021] According to the main status of the wind turbine, determine whether the wind turbine generator set is in a limited power operation state.

[0022] In one embodiment, collecting real-time parameters of a wind turbine generator set includes:

[0023] Collect the real-time power, power target value, pitch angle target value and wind speed of the wind turbine.

[0024] In one embodiment, the calculation formula of the pitch angle target value is:

[0025]

[0026] Among them, β target is the target value of the pitch angle, b is the adjustable coefficient, a 1 、a 2 and a 3 is the fitting coefficient, I 2 is the current of the hydrogen production electrolyzer, P 1 is the power of the grid-side inverter, β min is the minimum pitch angle of the wind turbine generator set, β max The pitch angle at which the wind turbine maintains minimum power operation.

[0027] In one embodiment, the minimum pitch angle β of the wind turbine is min The calculation formula is:

[0028]

[0029] Among them, C p is the wind energy utilization rate, and β is the pitch angle.

[0030] In one embodiment, the pitch angle β of the wind turbine generator set when it maintains minimum power operation is max The calculation formula is:

[0031] β max =P min (β)

[0032] Wherein, P is the power of the wind turbine.

[0033] In one embodiment, the calculation formula of the power P of the wind turbine generator set is:

[0034]

[0035] Among them, ρ is the air density, S is the swept area, and V is the wind speed.

[0036] In one embodiment, the wind energy utilization rate C p The calculation formula is:

[0037]

[0038] Among them, λ is the tip speed ratio, R is the wind rotor diameter, and ω is the wind rotor speed.

[0039] The beneficial effects of the present invention are:

[0040] The wind turbine generator set control method dynamically adjusts the target value of the pitch angle of the wind turbine generator set according to the real-time status of the wind turbine generator set to ensure the continuous operation of the hydrogen production electrolyzer and improve the utilization rate of electric energy, thereby increasing the benefits of the wind power hydrogen production system. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The present invention will be described in more detail below based on embodiments and with reference to the accompanying drawings, wherein:

[0042] Figure 1 shows a flow chart of the present invention;

[0043] Figure 2 A schematic diagram of a wind power hydrogen production system according to the present invention is shown. DETAILED DESCRIPTION

[0044] The present invention will be further described below in conjunction with the accompanying drawings.

[0045] Example 1

[0046] This embodiment provides a wind turbine generator control method for producing hydrogen. Figure 1 As shown, it includes the following steps:

[0047] When the wind power hydrogen production system is in operation, the real-time parameters of the wind turbine generator set, the voltage of the hydrogen production electrolyzer and the current of the hydrogen production electrolyzer are collected; wherein the real-time parameters of the wind turbine generator set include the real-time power of the wind turbine generator set, the power target value, the pitch angle target value and the wind speed;

[0048] According to the real-time parameters of the wind turbine generator set, it is determined whether the wind turbine generator set is in a limited power operation state; if the wind turbine generator set is in a limited power operation state, the output power of the grid-side inverter is kept unchanged, and the control system of the wind turbine generator set calculates the target value of the pitch angle of the wind turbine generator set when the hydrogen production electrolyzer is in rated operation under the current wind speed conditions;

[0049] If the wind turbine generator set is not in the power-limited operation state, the wind power generation income and hydrogen production income are calculated separately;

[0050] Determine whether the wind power generation income is greater than the hydrogen production income; if the wind power generation income is greater than the hydrogen production income, the principle of giving priority to power generation is adopted. Specifically, the hydrogen production electrolyzer is operated at the minimum power, and the control system of the wind turbine generator set adopts the maximum wind energy tracking control mode, that is, the target value of the pitch angle of the wind turbine generator set is the optimal pitch angle;

[0051] If the income from wind power generation is not greater than the income from hydrogen production, the principle of giving priority to hydrogen production is adopted. Specifically, the grid-side inverter outputs the minimum power, calculates the maximum current required for the rated operation of the hydrogen electrolyzer, and calculates the target pitch angle of the wind turbine when the hydrogen electrolyzer is operated at rated speed under the current wind speed conditions.

[0052] It can be understood that the wind turbine control method dynamically adjusts the target value of the pitch angle of the wind turbine according to the real-time status of the wind turbine to ensure the continuous operation of the hydrogen production electrolyzer and improve the utilization rate of electric energy, thereby increasing the total revenue of wind power generation and hydrogen production, and then increasing the revenue of the wind power hydrogen production system.

[0053] It should be noted that this embodiment adopts Figure 2 The schematic diagram of a typical wind power hydrogen production system is shown in Figure 2 It can be seen that the hydrogen production electrolyzer is directly connected to the DC bus of the wind turbine. Based on the working characteristics of the wind turbine converter, the working voltage of the hydrogen production electrolyzer can be kept constant, which reduces the voltage fluctuation at the end of the hydrogen production electrolyzer equipment, thereby ensuring the current stability at the end of the hydrogen production electrolyzer equipment, which is conducive to achieving stable hydrogen production.

[0054] In addition, from Figure 2 It can be seen that the power of the wind turbine is P, and the power of the grid-side inverter is P 1 , the voltage of the grid-side inverter is U 1 , the current of the grid-side inverter is I 1 , the power of the hydrogen production electrolyzer is P 2 , the voltage of the hydrogen production electrolyzer is U 2 , the current of the hydrogen production electrolyzer is I 2 , the voltage of the DC bus is U dc .

[0055] It should also be noted that when the wind turbine generator set is in the limited power operation state, if the calculated pitch angle target value meets the boundary condition requirements, the control system of the wind turbine generator set executes the pitch angle target value, otherwise the current state remains unchanged;

[0056] In addition, when the wind power generation income is not greater than the hydrogen production income, if the calculated pitch angle target value meets the boundary condition requirements, the control system of the wind turbine generator set executes the pitch angle target value, otherwise the control state of the control system before calculating the income remains unchanged.

[0057] The calculation formula for wind power generation revenue is:

[0058]

[0059] Among them, V 1 is the wind power generation income, d is t 1 ~t 2 The real-time on-grid electricity price during this period is P total t 1 ~t 2 The total power generation during this period.

[0060] The calculation formula for hydrogen production revenue is:

[0061] V 2 =e·T total (t 1 ,t 2 )-V loss

[0062] Among them, V 2 is the hydrogen production income, e is the hydrogen market price, T total t 1 ~t 2 The total hydrogen production during this period, V loss The fixed input costs for hydrogen production and storage.

[0063] In one embodiment, collecting real-time parameters of a wind turbine generator set includes:

[0064] Collect the main status of the fan;

[0065] According to the real-time parameters of the wind turbine generator set, judging whether the wind turbine generator set is in a power-limited operation state includes:

[0066] According to the main status of the wind turbine, determine whether the wind turbine generator set is in a limited power operation state.

[0067] Example 2

[0068] Based on Example 1, this embodiment provides a method for calculating a target pitch angle value, and the specific derivation process is as follows:

[0069] The calculation formula of the power P of the wind turbine is:

[0070]

[0071] Where ρ is air density, S is swept area, V is wind speed, C p is the wind energy utilization rate, β is the pitch angle;

[0072] Under the condition of known wind speed, the above formula can be simplified to:

[0073] P = αf(β)

[0074] Among them, α is the equivalent coefficient;

[0075] The power of the hydrogen production electrolyzer can be calculated based on the polarization characteristic curve (UI curve) of the electrolyzer, that is, the power P of the hydrogen production electrolyzer 2 The calculation formula is:

[0076]

[0077] Among them, a 1、a 2 and a 3 is the fitting coefficient;

[0078] Because U dc =U 1 =U 2 , and P = P 1 +P 2 Therefore, based on the boundary condition requirements, the calculation formula for the target value of the pitch angle of the wind turbine generator set when the hydrogen production electrolyzer is running at rated speed is as follows:

[0079]

[0080] Among them, β target is the target value of the pitch angle, b is the adjustable coefficient, β min is the minimum pitch angle of the wind turbine generator set, β max The pitch angle at which the wind turbine maintains minimum power operation.

[0081] Specifically, the wind energy utilization rate C p The calculation formula is:

[0082]

[0083] Among them, λ is the tip speed ratio, R is the wind wheel diameter; ω is the wind wheel speed, and is generally 8rpm~10rpm.

[0084] When the wind turbine is in a stable state, the speed ω is constant, the wind speed V is constant, that is, λ is a constant value, C p is an exponential function, C p When the maximum value is taken, the pitch angle β is the smallest, that is, the minimum pitch angle β of the wind turbine generator set min The calculation formula is:

[0085]

[0086] When the power P of the wind turbine generator set is at its minimum value, the wind speed is low, and C p Take the minimum value, C p is an exponential function. At this time, the pitch angle β is the largest, that is, the pitch angle β when the wind turbine maintains the minimum power operation max The calculation formula is:

[0087] β maz =P min (β).

[0088] In summary, the present invention aims to solve the volatility and instability problems of wind turbines in the hydrogen production process, and the current conventional control scheme mainly starts from the hydrogen production equipment side and focuses on system coordination control technology, and the operating state of the hydrogen production system is not directly coupled to the control system of the wind turbine. The present invention adds a control strategy for hydrogen production in the control system of the wind turbine, realizing the efficient operation of the wind power hydrogen production system.

[0089] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "bottom", "top", "front", "back", "inside", "outside", "left", "right", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0090] Although the present invention is described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the present invention. It should therefore be understood that many modifications may be made to the exemplary embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that the various dependent claims and features described herein may be combined in a manner different from that described in the original claims. It should also be understood that features described in conjunction with individual embodiments may be used in other described embodiments.

Claims

1. A wind turbine generator control method for hydrogen production, characterized in that: The following steps are involved: Collect real-time parameters of wind turbines; According to the real-time parameters of the wind turbine generator set, determine whether the wind turbine generator set is in a limited power operation state; if the wind turbine generator set is in a limited power operation state, keep the output power of the grid-side inverter unchanged, and calculate the target value of the pitch angle of the wind turbine generator set when the hydrogen production electrolyzer is in rated operation; If the wind turbine generator set is not in the power-limited operation state, the wind power generation income and hydrogen production income are calculated separately; Determine whether the wind power generation income is greater than the hydrogen production income; if the wind power generation income is greater than the hydrogen production income, the hydrogen production electrolyzer operates at the minimum power, and the target value of the pitch angle of the wind turbine generator set is the optimal pitch angle; If the revenue from wind power generation is not greater than the revenue from hydrogen production, the grid-side inverter will output at minimum power and calculate the target pitch angle of the wind turbine when the hydrogen production electrolyzer is operating at rated speed.

2. A wind turbine generator control method for hydrogen production according to claim 1, characterized in that: The calculation formula for wind power generation revenue is: Among them, V1 is the wind power generation income, d is the real-time on-grid electricity price during the period from t1 to t2, and P total It is the total power generation during the period from t1 to t2.

3. A wind turbine generator control method for hydrogen production according to claim 1, characterized in that: The calculation formula for hydrogen production revenue is: V2=e·T total (t1,t2)-V loss Among them, V2 is the hydrogen production income, e is the hydrogen market price, T total is the total hydrogen production during the period from t1 to t2, V loss The fixed input costs for hydrogen production and storage.

4. A wind turbine generator control method for hydrogen production according to claim 1, characterized in that: The real-time parameters of the wind turbine generator set are collected as follows: Collect the main status of the fan; The determining, based on the real-time parameters of the wind turbine generator set, whether the wind turbine generator set is in a power-limited operation state comprises: According to the main status of the wind turbine, determine whether the wind turbine generator set is in a limited power operation state.

5. A wind turbine generator control method for hydrogen production according to claim 1, characterized in that: The real-time parameters of the wind turbine generator set are collected as follows: Collect the real-time power, power target value, pitch angle target value and wind speed of the wind turbine.

6. A wind turbine generator control method for producing hydrogen according to claim 5, characterized in that: The calculation formula of the pitch angle target value is: Among them, β target is the target value of the pitch angle, b is the adjustable coefficient, a1, a2 and a3 are fitting coefficients, I2 is the current of the hydrogen production electrolyzer, P1 is the power of the grid-side inverter, β min is the minimum pitch angle of the wind turbine generator set, β max The pitch angle at which the wind turbine maintains minimum power operation.

7. A wind turbine generator control method for producing hydrogen according to claim 6, characterized in that: Minimum pitch angle β of wind turbine min The calculation formula is: β min ＝C pmax (β) Among them, C p is the wind energy utilization rate, and β is the pitch angle.

8. A wind turbine generator control method for producing hydrogen according to claim 6, characterized in that: The pitch angle β of the wind turbine when it maintains minimum power operation max The calculation formula is: β max ＝P min (β) Wherein, P is the power of the wind turbine.

9. A wind turbine generator control method for hydrogen production according to claim 8, characterized in that: The calculation formula of the power P of the wind turbine is: Among them, ρ is the air density, S is the swept area, and V is the wind speed.

10. A wind turbine generator control method for hydrogen production according to claim 7 or 9, characterized in that: Wind energy utilization rate C p The calculation formula is: Among them, λ is the tip speed ratio, R is the wind rotor diameter, and ω is the wind rotor speed.

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