A wind turbine generator system control method for hydrogen production

Abstract

The application discloses a wind turbine generator control method for hydrogen production, comprising the following steps: collecting real-time parameters of the wind turbine generator, judging whether the wind turbine generator is in a limited power operation state; if yes, keeping the output power of the grid-side inverter unchanged, and calculating the pitch angle target value of the wind turbine generator when the hydrogen production electrolytic cell is in a rated operation, otherwise, calculating the wind power generation benefit and the hydrogen production benefit respectively; judging whether the wind power generation benefit is greater than the hydrogen production benefit; if yes, the hydrogen production electrolytic cell is operated at minimum power, and the pitch angle target value of the wind turbine generator is the optimal pitch angle, otherwise, the grid-side inverter is output at minimum power, and the pitch angle target value of the wind turbine generator when the hydrogen production electrolytic cell is in a rated operation is calculated. According to the real-time state of the wind turbine generator, the pitch angle target value of the wind turbine generator is dynamically adjusted to ensure the continuous operation of the hydrogen production electrolytic cell, improve the utilization rate of electric energy, and improve the benefit of the wind power hydrogen production system.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of wind power generation, and particularly relates to a wind turbine generator control method for hydrogen production. BACKGROUND

[0002] In recent years, with the increase of wind power installed capacity and the progress of technology, wind power hydrogen production projects have begun to realize commercial operation, and the production and application scale of hydrogen energy are expanding. As a clean and efficient energy conversion method, wind power hydrogen production conforms to the current global energy transformation trend. However, wind power hydrogen production also has some problems. The volatility of wind power poses challenges to the stable operation of water electrolysis hydrogen production equipment and the quality of hydrogen. In addition, the intermittent and uncontrollable nature of wind power also brings difficulties to power grid dispatching, increasing the cost of power grid balancing. SUMMARY

[0003] The application provides a wind turbine generator control method for hydrogen production, which can ensure continuous operation of hydrogen production electrolysis tanks and improve benefits.

[0004] The application achieves the above-mentioned purpose by the following technical scheme:

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

[0006] Collecting real-time parameters of the wind turbine generator;

[0007] According to the real-time parameters of the wind turbine generator, it is determined whether the wind turbine generator is in a limited power operation state. If the wind turbine generator is in a limited power operation state, the output power of the grid-side inverter is kept unchanged, and the target value of the pitch angle of the wind turbine generator when the hydrogen production electrolysis tank is in a rated operation is calculated;

[0008] If the wind turbine generator is not in a limited power operation state, the wind power generation benefit and the hydrogen production benefit are calculated respectively;

[0009] It is determined whether the wind power generation benefit is greater than the hydrogen production benefit. If the wind power generation benefit is greater than the hydrogen production benefit, the hydrogen production electrolysis tank is operated at a minimum power, and the target value of the pitch angle of the wind turbine generator is an optimal pitch angle;

[0010] If the wind power generation benefit is not greater than the hydrogen production benefit, the grid-side inverter outputs at a minimum power, and the target value of the pitch angle of the wind turbine generator when the hydrogen production electrolysis tank is in a rated operation is calculated.

[0011] The beneficial effects of the above technical solutions are: the wind turbine control method dynamically adjusts the target value of the pitch angle of the wind turbine according to the real-time state of the wind turbine, so as to ensure the continuous operation of the hydrogen production electrolysis tank, improve the utilization rate of electric energy, and thus improve the income of the wind power hydrogen production system.

[0012] In one embodiment, the calculation formula of the wind power income is:

[0013]

[0014] wherein V1 is the wind power income, d is the real-time on-grid electricity price in the time period from t1 to t2, P total is the total power generation in the time period from t1 to t2.

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

[0016] V2 = e·T total (t1,t2)-V loss

[0017] wherein V2 is the hydrogen production income, e is the market price of hydrogen, T total is the total hydrogen production in the time period from t1 to t2, V loss is the fixed investment cost of hydrogen production and hydrogen storage.

[0018] In one embodiment, the real-time parameters of the wind turbine generator set include:

[0019] The main state of the wind turbine is collected.

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

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

[0022] In one embodiment, the real-time parameters of the wind turbine generator set include:

[0023] The real-time power, power target value, pitch angle target value and wind speed of the wind turbine generator set are collected.

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

[0025]

[0026] wherein β target is the pitch angle target value, b is an adjustable coefficient, a1, a2 and a3 are fitting coefficients, I2 is the current of the hydrogen production electrolysis tank, P1 is the power of the grid-side inverter, β minis the minimum pitch angle of the wind turbine max is the pitch angle of the wind turbine when the wind turbine is maintained to run at the minimum power.

[0027] In one embodiment, the minimum pitch angle β of the wind turbine min is calculated by the following formula:

[0028]

[0029] wherein 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 when the wind turbine is maintained to run at the minimum power max is calculated by the following formula:

[0031] β max = P min (β)

[0032] wherein P is the power of the wind turbine.

[0033] In one embodiment, the power P of the wind turbine is calculated by the following formula:

[0034]

[0035] wherein 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 is calculated by the following formula:

[0037]

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

[0039] The present application has the following advantages:

[0040] The wind turbine control method dynamically adjusts the target value of the pitch angle of the wind turbine according to the real-time state of the wind turbine, so as to ensure the continuous operation of the hydrogen production electrolysis tank, improve the utilization rate of electric energy, and thus improve the income of the wind power hydrogen production system. BRIEF DESCRIPTION OF DRAWINGS

[0041] The present application will be described in more detail below based on the embodiments and with reference to the accompanying drawings. In the drawings:

[0042] Figure 1 shows the flowchart of the present application;

[0043] Figure 2 shows the schematic diagram of the wind power hydrogen production system in the present application. DETAILED DESCRIPTION

[0044] The application will be further described below with reference to the drawings.

[0045] Embodiment 1

[0046] The embodiment provides a wind turbine generator control method for hydrogen production, as shown in the figure, which comprises the following steps: Figure 1

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

[0048] According to the real-time parameters of the wind turbine generator, it is judged whether the wind turbine generator is in a power limiting running state; if the wind turbine generator is in the power limiting running state, the output power of the grid-side inverter is kept unchanged, and the control system of the wind turbine generator calculates the pitch angle target value of the wind turbine generator under the condition that the hydrogen production electrolytic cell is in a rated running state at the current wind speed;

[0049] If the wind turbine generator is not in the power limiting running state, the wind power generation benefit and the hydrogen production benefit are calculated respectively;

[0050] It is judged whether the wind power generation benefit is greater than the hydrogen production benefit; if the wind power generation benefit is greater than the hydrogen production benefit, the principle of giving priority to power generation is adopted, and specifically, the hydrogen production electrolytic cell is in a minimum power running state, and the control system of the wind turbine generator adopts a maximum wind energy tracking control mode, that is, the pitch angle target value of the wind turbine generator is an optimal pitch angle;

[0051] If the wind power generation benefit is not greater than the hydrogen production benefit, the principle of giving priority to hydrogen production is adopted, and specifically, the grid-side inverter is in a minimum power output state, the maximum current required when the hydrogen production electrolytic cell is in a rated running state is calculated, and the pitch angle target value of the wind turbine generator under the condition that the hydrogen production electrolytic cell is in a rated running state at the current wind speed is calculated.

[0052] It can be understood that the wind turbine generator control method dynamically adjusts the pitch angle target value of the wind turbine generator according to the real-time state of the wind turbine generator, so as to ensure continuous running of the hydrogen production electrolytic cell and improve the utilization rate of electric energy, thereby improving the total benefit of wind power generation and hydrogen production, and further improving the benefit of the wind power hydrogen production system.

[0053] It should be noted that the embodiment adopts a typical wind power hydrogen production system as shown in the figure, and the wind power hydrogen production system comprises a wind turbine generator, a grid-side inverter, a hydrogen production electrolytic cell and a control system. Figure 2 Figure 2 ​​As can be seen from the above, the hydrogen production electrolyzer is directly connected to the DC bus of the wind turbine generator set, and based on the working characteristics of the wind turbine generator set converter, the working voltage of the hydrogen production electrolyzer can be kept constant, which reduces the voltage fluctuation at the equipment end of the hydrogen production electrolyzer, thereby ensuring the stability of the current at the equipment end of the hydrogen production electrolyzer, and further facilitating the realization of stable hydrogen production.

[0054] In addition, from Figure 2 As can be seen from the above, the power of the wind turbine generator set is P, the power of the grid-side inverter is P1, the voltage of the grid-side inverter is U1, the current of the grid-side inverter is I1, the power of the hydrogen production electrolyzer is P2, the voltage of the hydrogen production electrolyzer is U2, the current of the hydrogen production electrolyzer is I2, and the voltage of the DC bus is U dc .

[0055] It should be further pointed out that when the wind turbine generator set is in a power-limited operating state, if the calculated target value of the pitch angle meets the boundary condition requirement, the control system of the wind turbine generator set executes the target value of the pitch angle, otherwise the current state is maintained unchanged.

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

[0057] The calculation formula of the wind power generation benefit is:

[0058]

[0059] Wherein, V1 is the wind power generation benefit, d is the real-time grid-connected price in the time period t1-t2, P total is the total power generation in the time period t1-t2.

[0060] The calculation formula of the hydrogen production benefit is:

[0061] V2=e·T total (t1,t2)-V loss

[0062] Wherein, V2 is the hydrogen production benefit, e is the market price of hydrogen, T total is the total hydrogen production in the time period t1-t2, and V loss is the fixed investment cost of hydrogen production and storage.

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

[0064] Collecting the main state of the wind turbine;

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

[0066] According to the main state of the fan, it is judged whether the wind turbine is in a limited power operation state.

[0067] Embodiment 2

[0068] On the basis of embodiment 1, the embodiment provides a calculation method of the target value of the pitch angle, and the specific derivation process is as follows:

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

[0070]

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

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

[0073] P = αf(β)

[0074] Wherein, α is the equivalent coefficient.

[0075] And the power of the hydrogen production electrolyzer can be calculated according to the polarization characteristic curve (U-I curve) of the electrolyzer, that is, the calculation formula of the power P2 of the hydrogen production electrolyzer is:

[0076]

[0077] Wherein, a1, a2 and a3 are fitting coefficients.

[0078] And U dc = U1 = U2, and P = P1 + P2, so on the basis of considering the boundary condition requirement, the calculation formula of the target value of the pitch angle of the wind turbine when the hydrogen production electrolyzer is rated operation is as follows:

[0079]

[0080] Wherein, 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, and β max is the pitch angle when the wind turbine maintains minimum power operation.

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

[0082]

[0083] Wherein, lambda is tip speed ratio, R is wind wheel diameter; omega is wind wheel rotating speed, and generally is 8rpm~10rpm.

[0084] When the wind turbine is in a stable state, the rotating speed omega is constant, the wind speed V is constant, that is, lambda is a constant, C p is exponential function, C p When taking maximum value, the pitch angle beta is minimum, that is, the minimum pitch angle beta of the wind turbine min The calculation formula of C

[0085]

[0086] When the power P of the wind turbine takes minimum value, the wind speed is low, C p takes minimum value, C p is exponential function, at this time, the pitch angle beta is maximum, that is, the pitch angle beta of the wind turbine when maintaining minimum power operation max The calculation formula of C

[0087] beta maz =P min (beta).

[0088] In summary, the present application aims at solving the fluctuation and instability problems of the wind turbine in the hydrogen production link, and the current conventional control scheme mainly starts from the hydrogen production equipment side and focuses on the system coordinated control technology, and the hydrogen production system operating state is not directly coupled to the control system of the wind turbine.The control strategy for hydrogen production is added in the control system of the wind turbine in the present application, and the efficient operation of the wind power hydrogen production system is realized.

[0089] In the description of the present application, it should be understood that the terms "upper", "lower", "bottom", "top", "front", "back", "inner", "outer", "left", "right" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0090] Although the present application is described herein with reference to particular embodiments, it should be understood that these examples are merely illustrative of the principles and applications of the present application. It should therefore be understood that numerous modifications can be made to the illustrative embodiments, and that other arrangements can be devised without departing from the spirit and scope of the present application as defined by the appended claims. It should be understood that different dependent claims and features described herein can be combined with each other in ways not explicitly described. It should also be understood that features described in connection with a single embodiment can 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; Based on the real-time parameters of the wind turbine generator set, determine whether the wind turbine generator set is in a power-limited operation state; if the wind turbine generator set is in a power-limited operation state, maintain the output power of the grid-side inverter unchanged, and calculate the target value of the wind turbine generator set's pitch angle 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 revenue is greater than the hydrogen production revenue; if the wind power generation revenue is greater than the hydrogen production revenue, the hydrogen production electrolyzer operates at minimum power, and the target pitch angle value of the wind turbine generator set is the optimal pitch angle; If the wind power generation income is not greater than the hydrogen production income, the grid-side inverter outputs at the minimum power and calculates the target value of the wind turbine pitch angle when the hydrogen electrolyzer is operating at rated speed; 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 generator set; 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 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 that maintains the wind turbine at minimum power operation.

2. A wind turbine generator control method for hydrogen production according to claim 1, characterized in that: The formula for calculating 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 is the total power generation during the time 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 includes: According to the main status of the wind turbine, determine whether the wind turbine generator set is in the power-limited operation state.

5. The method for controlling a wind turbine generator set for hydrogen production according to claim 1, wherein: Minimum pitch angle β of wind turbine min The calculation formula is: Among them, C p is the wind energy utilization rate, and β is the pitch angle.

6. A wind turbine generator control method for hydrogen production according to claim 1, 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.

7. A wind turbine generator control method for hydrogen production according to claim 6, characterized in that: The calculation formula for the power P of a wind turbine is: Where ρ is the air density, S is the swept area, and V is the wind speed.

8. A wind turbine generator control method for hydrogen production according to claim 5 or 7, characterized in that: Wind energy utilization rate C p The calculation formula is: Among them, λ is the tip speed ratio, R is the rotor diameter, and ω is the rotor speed.

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