Cooperative control system and method for off-network hydrogen production based on source load network

Abstract

The invention relates to a cooperative control system and method for off-grid hydrogen production based on a source-load network. The system comprises a wind turbine generator side, a power grid and a hydrogen production equipment side, the hydrogen production equipment side comprises an AC / DC uncontrolled rectifier, a DC / DC controller, a switch KM4 and an electrolytic cell which are electrically connected in sequence; the wind turbine generator set side is electrically connected with the hydrogen production equipment side through the first transformer and the second transformer in sequence, and the power grid is electrically connected between the first transformer and the second transformer through the switch KM1; in an off-grid hydrogen production mode, the switch KM1 is in an off state, the switch KM4 is in a closed state, and the wind turbine generator set supplies power to the hydrogen production equipment side through the first transformer and the second transformer in sequence; and in the off-grid hydrogen production mode, the voltage of the power grid is balanced and stabilized by controlling the active power output to the hydrogen production equipment side from the wind turbine generator system side. Therefore, the power grid voltage (namely P-U control strategy) is established by controlling the output of the active power, and the problem that the voltage of a traditional voltage source type fan converter is difficult to control in a passive environment is solved.

Description

Technical Field

[0001] The present application relates to the technical field of wind power hydrogen production, and in particular to a coordinated control system and method for off-grid hydrogen production based on source-load grid construction. Background Art

[0002] In recent years, with the rapid growth of wind power installed capacity, the problems caused by wind power grid connection have become increasingly prominent. Large-scale, uncontrollable and low-quality wind power grid connection poses a severe challenge to the security of the power grid. At the same time, the concentration of large-scale wind farms has brought great pressure to the local power grid transmission, resulting in a large amount of wind abandonment. In addition, a large amount of grid-connected wind power has caused great difficulties for the power grid dispatching center, causing the cost of grid balancing to gradually increase.

[0003] In response to the above problems, one of the current research focuses is to actively explore energy conversion methods, especially to convert wind energy into hydrogen energy for utilization. Wind power hydrogen production technology has emerged. This technology converts wind energy into electrical energy through wind turbines, and then converts electrical energy into hydrogen through water electrolysis hydrogen production equipment, and finally transports hydrogen to the application terminal, thus realizing the conversion from wind energy to hydrogen energy. This technology not only helps to solve the problems caused by wind power grid connection, but also provides a new way for the storage and utilization of wind energy.

[0004] In wind power hydrogen production technology, off-grid wind power hydrogen production, as a special application mode, has significant advantages. This technology directly provides the electricity generated by a single or multiple wind turbines to the water electrolysis hydrogen production equipment for hydrogen production without passing through the power grid. Therefore, it is particularly suitable for distributed hydrogen production or local application in fuel cell power generation. As a new energy storage method, off-grid wind power hydrogen production technology can more effectively smooth out the imbalance of large-scale wind farm power generation and improve the utilization rate of wind energy.

[0005] However, there are also some technical difficulties in the implementation of wind power hydrogen production technology.

[0006] In traditional voltage source wind turbine converters, in an active environment, when the wind turbine is connected to an active grid (even a weak grid), the converter uses Pf / QU droop control or virtual synchronous machine control technology to establish the grid voltage and frequency. This control method enables the converter to simulate the behavior of a traditional synchronous generator, thereby supporting the frequency and voltage stability of the grid. However, in a passive environment (i.e., off-grid operation or connected to a very weak grid), such as a wind power off-grid hydrogen production system, the traditional QU control cannot effectively regulate the voltage because the hydrogen production equipment (such as an electrolyzer) is equivalent to a pure resistance characteristic, mainly absorbing active power and requiring little reactive power. This results in the inability to establish and stabilize the grid voltage through reactive power, making the voltage control of the system difficult.

[0007] Moreover, in the traditional voltage source grid construction technology, the system maintains the stability of the grid voltage by adjusting the reactive power. This method requires the system to have a larger overload capacity to meet the output requirements of active power and reactive power at the same time. However, the increase in overload capacity will lead to an increase in the size and cost of system equipment. Summary of the invention

[0008] In view of the above problems in the prior art, the present application provides a collaborative control system and method for off-grid hydrogen production based on source-load grid construction. The present application dynamically adjusts the output active power of the wind turbine according to the power demand of the hydrogen production equipment and the output power of the wind turbine to ensure the stability of the grid voltage, thereby solving the problem of difficult voltage control of traditional voltage source wind turbine converters in a passive environment.

[0009] To achieve the above-mentioned purpose, the first aspect of the present application provides a coordinated control system for off-grid hydrogen production based on source-load grid construction, including: a wind turbine side, a power grid, and a hydrogen production equipment side; wherein the hydrogen production equipment side includes an AC / DC uncontrolled rectifier, a DC / DC controller, a switch KM4, and an electrolyzer electrically connected in sequence;

[0010] The wind turbine generator set is electrically connected to the hydrogen production equipment through a first transformer and a second transformer in sequence, and the power grid is electrically connected between the first transformer and the second transformer through a switch KM1;

[0011] The first transformer is used to realize voltage conversion between the power grid and the wind turbine generator set;

[0012] The second transformer is used to realize voltage conversion between the wind turbine side and the hydrogen production equipment side;

[0013] The switch KM1 is used to control the connection between the wind turbine generator set and the power grid;

[0014] The switch KM4 is used to control the connection between the wind turbine side and the hydrogen production equipment side;

[0015] In the grid-connected power generation mode, the switch KM1 is in a closed state, the switch KM4 is in an open state, the grid supplies power to the wind turbine side through the first transformer, and the wind turbine side transmits the generated electric energy to the grid through the first transformer;

[0016] In the off-grid hydrogen production mode, the switch KM1 is in an open state, the switch KM4 is in a closed state, and the wind turbine generator system supplies power to the hydrogen production equipment side through the first transformer and the second transformer in sequence;

[0017] Wherein, in the off-grid hydrogen production mode, the grid voltage is stabilized by controlling the active power balance output from the wind turbine side to the hydrogen production equipment side.

[0018] In this way, since the hydrogen production equipment side mainly absorbs active power and the demand for reactive power is very small, the traditional QU control cannot effectively regulate the voltage. Therefore, in the off-grid hydrogen production mode, the present application establishes the grid voltage by controlling the output of active power (i.e., PU control strategy). Specifically, according to the power demand of the hydrogen production equipment and the output power of the wind turbine, the output active power of the wind turbine is dynamically adjusted to ensure the stability of the grid voltage, solving the problem of difficult voltage control of traditional voltage source wind turbine converters in a passive environment.

[0019] As a possible implementation of the first aspect, the wind turbine generator set side includes: a generator and a doubly-fed AC converter;

[0020] The rotor of the generator is connected to the input end of the first transformer through the double-fed AC converter and the switch KM2; the stator of the generator is electrically connected to the input end of the first transformer through the switch KM3;

[0021] The switch KM2 is used to control the on / off of the branch where the generator and the double-fed AC device are located;

[0022] The switch KM3 is used to control the on / off between the generator and the first transformer;

[0023] When the switch KM2 is in a closed state, the current on the rotor side of the generator flows to the double-fed AC converter for processing; when the switch KM2 is in an open state, the path is cut off;

[0024] When the switch KM3 is in a closed state, the current on the stator side of the generator is allowed to flow to the first transformer for processing; when the switch KM3 is in an open state, the path is cut off.

[0025] In this way, by controlling the switches KM2 and KM3, a specific current path can be cut off when necessary to protect the generator, the double-fed AC unit, the first transformer and other equipment from overload or failure.

[0026] As a possible implementation manner of the first aspect, the doubly-fed AC converter has current source characteristics.

[0027] In this way, the current source characteristic helps to maintain the voltage and frequency stability of the system without grid support, ensuring the reliable operation of the off-grid hydrogen production system. In addition, by precisely controlling the current output, the conversion process from wind energy to hydrogen energy can be ensured to be more efficient and reduce energy loss.

[0028] To achieve the above-mentioned object, the second aspect of the present application provides a coordinated control method for off-grid hydrogen production based on source-load grid, which is applied to the coordinated control system described in the first aspect above, and the method comprises:

[0029] In the grid-connected power generation mode, the switch KM1 is in a closed state, the switch KM4 is in an open state, the grid supplies power to the wind turbine side through the first transformer, and the wind turbine side transmits the generated electric energy to the grid through the first transformer;

[0030] In the off-grid hydrogen production mode, the switch KM1 is in an open state, the switch KM4 is in a closed state, and the wind turbine generator system supplies power to the hydrogen production equipment side through the first transformer and the second transformer in sequence;

[0031] Wherein, in the off-grid hydrogen production mode, the grid voltage is stabilized by controlling the active power balance output from the wind turbine side to the hydrogen production equipment side.

[0032] In this way, since the hydrogen production equipment side mainly absorbs active power and the demand for reactive power is very small, the traditional QU control cannot effectively regulate the voltage. Therefore, in the off-grid hydrogen production mode, the present application establishes the grid voltage by controlling the output of active power (i.e., PU control strategy). Specifically, according to the power demand of the hydrogen production equipment and the output power of the wind turbine, the output active power of the wind turbine is dynamically adjusted to ensure the stability of the grid voltage, solving the problem of difficult voltage control of traditional voltage source wind turbine converters in a passive environment.

[0033] As a possible implementation manner of the second aspect, in the off-grid hydrogen production mode, the working modes of the hydrogen production equipment side and the wind turbine generator side include a normal mode and an emergency mode;

[0034] The normal mode of the hydrogen production equipment side is: the output voltage of the AC / DC uncontrolled rectifier is stabilized at a preset voltage value; the emergency mode is: through constant power control, the output power of the electrolyzer is limited so that it does not exceed the preset power limit threshold;

[0035] The normal mode on the wind turbine side is: the output power of the generator is greater than the required power of the electrolyzer, and the required power response speed of the electrolyzer is faster than the output power setting value of the generator; the emergency mode is: through PU droop control, the output power of the generator is stabilized at the power limit threshold of the electrolyzer, thereby stabilizing the grid voltage.

[0036] As a possible implementation manner of the second aspect, the method further includes:

[0037] Obtaining the output power of the electrolyzer;

[0038] When the obtained output power of the electrolyzer is greater than the preset power limit threshold, the hydrogen production equipment side generates a first power limit flag signal and sends it to the wind turbine side, and the hydrogen production equipment side switches from the normal mode to the emergency mode.

[0039] As a possible implementation manner of the second aspect, after the hydrogen production equipment side switches from the normal mode to the emergency mode, the method further includes:

[0040] The wind turbine generator set side receives the first power limit flag signal;

[0041] Obtain the DC side bus voltage of the converter;

[0042] When the acquired converter DC side bus voltage is greater than a preset voltage value, the wind turbine generator set side switches from the normal mode to the emergency mode.

[0043] As a possible implementation manner of the second aspect, the method further includes:

[0044] Obtaining the output voltage of the AC / DC uncontrolled rectifier on the hydrogen production equipment side;

[0045] When the obtained output voltage of the AC / DC uncontrolled rectifier is less than a preset voltage value, the hydrogen production equipment side generates a second power limit flag signal and sends it to the wind turbine side, and the hydrogen production equipment side switches from the emergency mode to the normal mode.

[0046] As a possible implementation manner of the second aspect, after the hydrogen production equipment side switches from the emergency mode to the normal mode, the method further includes:

[0047] The wind turbine generator set side receives the second power limit flag signal;

[0048] Get the AC bus voltage;

[0049] When the acquired AC bus voltage is less than a set voltage value, the wind turbine generator set side switches from the emergency mode to the normal mode.

[0050] As a possible implementation manner of the second aspect, the first power limit flag signal and the second power limit flag signal are current operation modes of the hydrogen production equipment side;

[0051] The first power limit flag signal corresponds to the hydrogen production equipment side currently being in the emergency mode;

[0052] The second power limit flag signal corresponds to the hydrogen production equipment side currently being in the normal mode. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 It is a grid-side PLL phase-locked loop control block diagram in the traditional solution;

[0054] Figure 2 It is a control block diagram of a grid-side converter in a traditional solution;

[0055] Figure 3 It is a control block diagram of a machine-side converter in a traditional solution;

[0056] Figure 4 It is a machine-side converter control block diagram provided by the present application;

[0057] Figure 5 This is a structural block diagram of a coordinated control system for off-grid hydrogen production based on source-load grid provided by the present application;

[0058] Figure 6 This is a circuit diagram of a coordinated control system for off-grid hydrogen production based on source-load grid provided by the present application;

[0059] Figure 7 This is a flow chart of a system entering an off-grid hydrogen production mode provided by the present application;

[0060] Figure 8 This is a flow chart of a coordinated control method for off-grid hydrogen production based on source-load grid provided by the present application;

[0061] Fig. 9 It is a control block diagram of a hydrogen production equipment side provided by this application;

[0062] Fig.10 It is a structural schematic diagram of a computing device provided in an embodiment of the present application.

[0063] It should be understood that the size and shape of each block diagram in the above structural diagram are for reference only and should not constitute an exclusive interpretation of the embodiment of the present invention. The relative position and inclusion relationship between the blocks presented in the structural diagram are only schematic representations of the structural association between the blocks, and do not limit the physical connection method of the embodiment of the present invention. DETAILED DESCRIPTION

[0064] The technical solution provided by the present application is further described below with reference to the accompanying drawings and examples. It should be understood that the system structure and business scenarios provided in the examples of the present application are mainly to illustrate the possible implementation methods of the technical solution of the present application and should not be interpreted as the only limitation on the technical solution of the present application. It is known to those of ordinary skill in the art that with the evolution of the system structure and the emergence of new business scenarios, the technical solution provided by the present application is also applicable to similar technical problems.

[0065] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present application. In case of any inconsistency, the meaning described in this specification or the meaning derived from the contents recorded in this specification shall prevail. In addition, the terms used herein are only for the purpose of describing the embodiments of the present application and are not intended to limit the present application.

[0066] Source-load network: In a distributed energy system, a self-managed small power grid or microgrid is formed between the power source and the load in some way. In this application, the power source is a wind turbine and the load is a hydrogen production equipment.

[0067] Pf control: Maintain the stability of the grid frequency (f) by adjusting the active power (P).

[0068] QU control: Maintain the stability of the grid voltage (U) by adjusting the reactive power (Q).

[0069] Before introducing the present invention, the grid control of a doubly-fed wind turbine generator system in the prior art is first introduced as follows.

[0070] Doubly-fed wind turbines use back-to-back dual PWM converter technology to control the system through the grid-side converter and the machine-side converter. Specifically, the PLL phase-locked loop is used to detect and track the phase of the grid voltage to ensure that the output of the grid-side converter is synchronized with the grid voltage. The grid-side converter maintains the stability of the DC bus voltage by adjusting the output current to ensure the stable operation of the system. The machine-side converter adjusts the active component of the rotor current through maximum power point tracking (MPPT) control, so that the wind turbine always operates at the maximum power point at different wind speeds, thereby maximizing the active power output and ultimately achieving power output to the grid.

[0071] Mathematical model of grid-side converter:

[0072]

[0073] Where, L is the grid-side reactance, ω is the angular frequency, i d ,i q is the grid-side module current in the two-phase rotating coordinate system, u d ,u q is the module output voltage in the two-phase rotating coordinate system, e d ,e q is the grid voltage in the two-phase rotating coordinate system, l is the inductance in the two-phase rotating coordinate system, and R is the equivalent resistance.

[0074] Mathematical model of machine-side converter:

[0075]

[0076] Where, L is the machine side reactance, ω is the angular frequency, i rd ,i rq is the module current on the machine side in the two-phase rotating coordinate system, u rd ,u rq is the output voltage of the machine-side module in the two-phase rotating coordinate system, e sd ,e sq is the stator voltage in the two-phase rotating coordinate system, l r is the equivalent inductance of the generator, R r is the equivalent resistance.

[0077] For traditional grid-connected units, the generator-side converter establishes the grid voltage and frequency, and the grid-side converter performs root grid control. For details, see Figures 1 to 3 shown.

[0078] for Figure 1 , collect the three-phase grid voltage, where u ga Indicates the voltage of phase A, u gb Indicates the B phase voltage, u gc Represents the C phase voltage. After coordinate system conversion, the two-phase voltage u d and u q , after passing through the PI controller, it is sent to an integral link to accumulate the error and generate the angle θ g .

[0079] for Figure 2 Grid-Side Converter (GSC) adopts dual closed-loop control of bus voltage outer loop and current inner loop, which is a common control strategy, mainly used to ensure the stability and high performance of the system. This control method realizes precise control of DC bus voltage and AC side current through two coordinated control loops.

[0080] for Figure 3 The core of this technology is to adjust the output frequency of the generator through the active power loop (Pf control) and maintain the stability of the grid voltage through the reactive power loop (Qu control). These two links are finally input into the voltage loop and current loop respectively to implement vector control, so as to achieve the purpose of precise regulation.

[0081] The present invention is different from the above-mentioned prior art in that the machine side does not rely on the angle information provided by the external power grid to perform coordinate transformation, but instead provides a fixed frequency signal by itself and generates the angle of the power grid through integration operation. This angle signal is used to convert the voltage and current signals in the three-phase stationary coordinate system (abc) into the synchronous rotating coordinate system (dq) so as to perform effective decoupling control of active power and reactive power in the dq coordinate system. In the dq coordinate system, the active power loop and the reactive power loop are controlled separately. The goal of the active power loop is to control the output of active power, while the reactive power loop is responsible for adjusting the reactive power to meet specific needs or optimize the operating conditions of the system. In addition, a current inner loop is provided, whose function is to ensure that the actual current can quickly and accurately track the set current reference value, thereby achieving effective control of active power and reactive power. See Figure 4 The control block diagram of the machine-side converter is shown in FIG.

[0082] The embodiment of the present application provides a coordinated control system for off-grid hydrogen production based on source-load grid construction, such as Figure 5 and Figure 6 As shown, it includes: a wind turbine side, a power grid, and a hydrogen production equipment side; wherein the hydrogen production equipment side includes an AC / DC uncontrolled rectifier, a DC / DC controller, a switch KM4, and an electrolyzer electrically connected in sequence;

[0083] The wind turbine generator set is electrically connected to the hydrogen production equipment through a first transformer and a second transformer in sequence, and the power grid is electrically connected between the first transformer and the second transformer through a switch KM1;

[0084] The first transformer is used to realize voltage conversion between the power grid and the wind turbine generator set;

[0085] The second transformer is used to realize voltage conversion between the wind turbine side and the hydrogen production equipment side;

[0086] The switch KM1 is used to control the connection between the wind turbine generator set and the power grid;

[0087] The switch KM4 is used to control the connection between the wind turbine side and the hydrogen production equipment side;

[0088] In the grid-connected power generation mode, the switch KM1 is in a closed state, the switch KM4 is in an open state, the grid supplies power to the wind turbine side through the first transformer, and the wind turbine side transmits the generated electric energy to the grid through the first transformer;

[0089] In the off-grid hydrogen production mode, the switch KM1 is in an open state, the switch KM4 is in a closed state, and the wind turbine generator system supplies power to the hydrogen production equipment side through the first transformer and the second transformer in sequence;

[0090] Wherein, in the off-grid hydrogen production mode, the grid voltage is stabilized by controlling the active power balance output from the wind turbine side to the hydrogen production equipment side.

[0091] In this way, since the hydrogen production equipment side mainly absorbs active power and the demand for reactive power is very small, the traditional QU control cannot effectively regulate the voltage. Therefore, in the off-grid hydrogen production mode, the present application establishes the grid voltage by controlling the output of active power (i.e., PU control strategy). Specifically, according to the power demand of the hydrogen production equipment and the output power of the wind turbine, the output active power of the wind turbine is dynamically adjusted to ensure the stability of the grid voltage, solving the problem of difficult voltage control of traditional voltage source wind turbine converters in a passive environment.

[0092] The first transformer includes two parts: transformer 1 converts the voltage of 35kV to 1140V, and transformer 2 converts the voltage of 1140V to 35kV. The second transformer includes transformer 3, which converts the voltage of 35kV to 450V.

[0093] Specifically, in the grid-connected power generation mode, the grid provides electric energy to the wind turbine side. The 35kV grid provides three-phase AC power to the wind turbine side through transformer 1, and the wind turbine side transmits the generated power to the 35kV grid through transformer 2, realizing a two-way flow of power.

[0094] In the off-grid hydrogen production mode, the wind turbine side is no longer connected to the 35kV grid, but directly supplies power to the hydrogen production equipment. The 35kV grid provides three-phase AC power to the hydrogen production equipment side through transformer 3, which is mainly used for starting and auxiliary equipment.

[0095] In some embodiments, the wind turbine generator side includes: a generator and a double-fed AC converter;

[0096] The rotor of the generator is connected to the input end of the first transformer through the double-fed AC converter and the switch KM2; the stator of the generator is electrically connected to the input end of the first transformer through the switch KM3;

[0097] The switch KM2 is used to control the on / off of the branch where the generator and the double-fed AC device are located;

[0098] The switch KM3 is used to control the on / off between the generator and the first transformer;

[0099] When the switch KM2 is in a closed state, the current on the rotor side of the generator flows to the double-fed AC converter for processing; when the switch KM2 is in an open state, the path is cut off;

[0100] When the switch KM3 is in a closed state, the current on the stator side of the generator is allowed to flow to the first transformer for processing; when the switch KM3 is in an open state, the path is cut off.

[0101] In this way, by controlling the switches KM2 and KM3, a specific current path can be cut off when necessary to protect the generator, the double-fed AC unit, the first transformer and other equipment from overload or failure.

[0102] Specifically, the doubly-fed converter is composed of two converter modules, namely a machine-side converter and a grid-side converter.

[0103] Machine-side converter: Figure 5 The left converter in the figure is directly connected to the rotor winding of the generator. Its main task is to regulate the rotor current and thus control the output power of the generator. By adjusting the rotor current, optimal energy capture can be achieved under different wind speed conditions.

[0104] Grid-side converter: Figure 5 The right converter in the figure is connected to the grid. Its main task is to control the stability of the DC bus voltage and convert the DC power from the machine-side converter into AC power suitable for grid transmission. In addition, in some cases, the grid-side converter may also participate in the regulation of grid voltage and frequency.

[0105] In addition, a large-capacity capacitor is provided between the machine-side converter and the grid-side converter. The capacitor plays a role of buffering and isolation, and is specifically used to store energy and smooth DC voltage fluctuations.

[0106] It is worth noting that the grid-side converter is based on the PLL phase-locked loop grid-following control, and the machine-side converter adopts dual closed-loop control without PLL phase-locked loop control algorithm.

[0107] In some embodiments, the doubly-fed AC converter has current source characteristics.

[0108] The reasons for setting the doubly-fed AC converter to current source characteristics are as follows:

[0109] (1) The electrolyzer is equivalent to a pure resistive load. In the off-grid hydrogen production mode, a stable current source is required to ensure the stability and efficiency of the electrolysis process. The current source characteristics can better match this load requirement and ensure the continuity and reliability of the electrolyzer operation.

[0110] (2) Current source control can respond to load changes more quickly, especially when the load demand suddenly increases or decreases. Current source control can quickly adjust the output to maintain stable operation of the system, which is crucial to improving the dynamic performance of the system.

[0111] (3) Without grid support, traditional voltage source control is difficult to achieve stable control, especially for reactive power regulation. The current source characteristic can simplify the design of the control system and achieve grid voltage and frequency stability by directly controlling the current, avoiding complex reactive power regulation mechanisms.

[0112] In this way, the current source characteristic helps to maintain the voltage and frequency stability of the system without grid support, ensuring the reliable operation of the off-grid hydrogen production system. In addition, by precisely controlling the current output, the conversion process from wind energy to hydrogen energy can be ensured to be more efficient and reduce energy loss.

[0113] like Figure 7 As shown, the specific process of the system switching from the grid-connected power generation mode to the off-grid hydrogen production mode will be specifically described as follows.

[0114] After receiving the start-up command of the wind turbine, the system enters the grid-connected power generation mode, switches KM1, KM2 and KM3 are all closed, and the wind turbine side transmits the generated electric energy to the grid;

[0115] After receiving the shutdown command of the wind turbine, the system enters the off-grid hydrogen production mode from the grid-connected power generation mode. Switches KM1, KM2, and KM3 are all disconnected, the connection between the wind turbine and the grid is interrupted, and the transmission of electricity to the grid is stopped. Switch KM4 is closed, indicating that the hydrogen production equipment side has started to operate. In the off-grid hydrogen production mode, the wind turbine can still continue to operate, but it no longer supplies power to the grid. Instead, the electricity it generates is directly supplied to the hydrogen production equipment. The hydrogen production equipment converts electrical energy into chemical energy and stores it in hydrogen by electrolyzing water. In this way, even if the grid cannot accept more electricity, wind energy resources can be fully utilized.

[0116] It is worth noting that when the power grid is limited or wind power is abandoned, wind turbines can produce hydrogen off-grid in a single or multiple units, effectively converting electrical energy into hydrogen energy and improving the utilization rate of wind energy. The hydrogen energy storage system can not only improve the utilization efficiency of renewable energy systems, but also optimize the power generation quality of intermittent renewable energy power and ensure the safety and stability of the power grid.

[0117] The embodiment of the present application provides a coordinated control method for off-grid hydrogen production based on source-load grid, which is applied to the above-mentioned coordinated control system, such as Figure 8 As shown, the method includes:

[0118] S801, in the grid-connected power generation mode, the switch KM1 is in a closed state, the switch KM4 is in an open state, the grid supplies power to the wind turbine side through the first transformer, and the wind turbine side transmits the generated electric energy to the grid through the first transformer;

[0119] S802. In the off-grid hydrogen production mode, the switch KM1 is in the open state, the switch KM4 is in the closed state, and the wind turbine group supplies power to the hydrogen production equipment side through the first transformer and the second transformer in turn; wherein, in the off-grid hydrogen production mode, the grid voltage is stabilized by controlling the active power balance output from the wind turbine group side to the hydrogen production equipment side.

[0120] In this way, since the hydrogen production equipment side mainly absorbs active power and the demand for reactive power is very small, the traditional QU control cannot effectively regulate the voltage. Therefore, in the off-grid hydrogen production mode, the present application establishes the grid voltage by controlling the output of active power (i.e., PU control strategy). Specifically, according to the power demand of the hydrogen production equipment and the output power of the wind turbine, the output active power of the wind turbine is dynamically adjusted to ensure the stability of the grid voltage, solving the problem of difficult voltage control of traditional voltage source wind turbine converters in a passive environment.

[0121] In some embodiments, in the off-grid hydrogen production mode, Fig. 9 As shown, in the off-grid hydrogen production mode, the working modes of the hydrogen production equipment side and the wind turbine side include a normal mode and an emergency mode;

[0122] The normal mode of the hydrogen production equipment side is: the output voltage of the AC / DC uncontrolled rectifier is stabilized at a preset voltage value; the emergency mode is: through constant power control, the output power of the electrolyzer is limited so that it does not exceed the preset power limit threshold;

[0123] The normal mode on the wind turbine side is: the output power of the generator is greater than the required power of the electrolyzer, and the required power response speed of the electrolyzer is faster than the output power setting value of the generator; the emergency mode is: through PU droop control, the output power of the generator is stabilized at the power limit threshold of the electrolyzer, thereby stabilizing the grid voltage.

[0124] The details will be described below.

[0125] For the hydrogen production equipment side, in normal mode, when the output voltage of the AC / DC uncontrolled rectifier is stabilized at a preset voltage value (such as 636V), it can ensure that the three-phase voltage on the AC side can be maintained at a stable state of 450V and 1140V respectively; in emergency mode, the actual output power can be stabilized at a preset power limit threshold by adjusting the working state of the electrolyzer (such as electrolysis current).

[0126] For the wind turbine side, in normal mode, the reason for making the generator output power greater than the required power of the electrolyzer is to ensure that the electrolyzer can obtain sufficient electricity for hydrogen production and have a certain power margin to cope with possible power fluctuations or increased demand, so as to ensure the stable operation of the electrolyzer and improve the reliability and efficiency of the entire wind power-hydrogen energy system. The reason for making the required power response speed of the electrolyzer faster than the output power setting value of the generator is to maintain the dynamic balance and response speed of the system. When the power demand of the electrolyzer changes, if its response speed can be faster than the adjustment speed of the output power setting value of the generator, then the system can adapt to such changes more quickly and reduce power fluctuations and imbalances. In emergency mode, the output voltage can be adjusted according to the actual output power and the preset droop characteristic curve to stabilize the output power of the generator at the power limit threshold of the electrolyzer.

[0127] In some embodiments, the method further comprises:

[0128] Obtaining the output power of the electrolyzer;

[0129] When the obtained output power of the electrolyzer is greater than the preset power limit threshold, the hydrogen production equipment side generates a first power limit flag signal and sends it to the wind turbine side, and the hydrogen production equipment side switches from the normal mode to the emergency mode.

[0130] In this way, by monitoring the output power of the electrolyzer in real time and comparing it with the preset power limit threshold, the working mode of the hydrogen production equipment can be intelligently controlled. When the preset power limit threshold is exceeded, the hydrogen production equipment side can promptly generate a power limit flag signal and switch to emergency mode, thereby limiting the output power of the electrolyzer and ensuring the stability of the grid voltage. When the preset power limit threshold is not exceeded, the hydrogen production equipment continues to operate normally to meet the power demand of the electrolyzer while maintaining the stability of the grid voltage and frequency. This control method improves the flexibility and response speed of the system, and helps to achieve stable operation of the power grid and efficient use of energy.

[0131] In some embodiments, after the hydrogen production equipment side switches from the normal mode to the emergency mode, the method further includes:

[0132] The wind turbine generator set side receives the first power limit flag signal;

[0133] Obtain the DC side bus voltage of the converter;

[0134] When the acquired converter DC side bus voltage is greater than a preset voltage value, the wind turbine generator set side switches from the normal mode to the emergency mode.

[0135] In this way, the output power of the electrolyzer is limited through constant power control on the hydrogen production equipment side to prevent the electrolyzer from being damaged due to overload. At the same time, the output power of the generator is stabilized at the power limit threshold of the electrolyzer through PU droop control on the wind turbine side. In other words, the coordinated control between the hydrogen production equipment side and the wind turbine side ensures the stable operation of the system.

[0136] In actual applications, the system will continuously monitor key indicators to ensure that they are in optimal operating condition. When it is detected that the system has been relieved in emergency mode, corresponding measures will be taken to switch from emergency mode to normal mode. For details, please refer to the following content.

[0137] In some embodiments, the method further comprises:

[0138] Obtaining the output voltage of the AC / DC uncontrolled rectifier on the hydrogen production equipment side;

[0139] When the obtained output voltage of the AC / DC uncontrolled rectifier is less than a preset voltage value, the hydrogen production equipment side generates a second power limit flag signal and sends it to the wind turbine side, and the hydrogen production equipment side switches from the emergency mode to the normal mode.

[0140] In this way, by real-time monitoring of the output voltage of the AC / DC uncontrolled rectifier, the system can quickly capture the reduction in power demand on the hydrogen production equipment side. Once the output voltage is lower than the preset voltage value, the system immediately generates a second power limit flag signal and triggers mode switching, thereby improving the system's response speed to changes.

[0141] In some embodiments, after the hydrogen production equipment side switches from the emergency mode to the normal mode, the method further includes:

[0142] The wind turbine generator set side receives the second power limit flag signal;

[0143] Get the AC bus voltage;

[0144] When the acquired AC bus voltage is less than a set voltage value, the wind turbine generator set side switches from the emergency mode to the normal mode.

[0145] In this way, through the signal transmission and response between the hydrogen production equipment side and the wind turbine side, close coordination between the two is achieved. When the hydrogen production equipment side switches to normal mode, the wind turbine side also switches modes according to corresponding conditions. Specifically, when the power demand on the hydrogen production equipment side decreases and the AC bus voltage is also within a safe range, the wind turbine can be restored to normal mode, which can reduce these unnecessary power restrictions and enable the system to make more full use of renewable energy.

[0146] In summary, when the system returns to normal mode, it will switch back to normal mode from emergency mode through the hydrogen production equipment side and the wind turbine side, thereby ensuring that the system's voltage and power output return to a stable state and avoiding instability caused by the system being in emergency mode for a long time.

[0147] In some embodiments, the first power limit flag signal and the second power limit flag signal are the current operation mode of the hydrogen production equipment side;

[0148] The first power limit flag signal corresponds to the hydrogen production equipment side currently being in the emergency mode;

[0149] The second power limit flag signal corresponds to the hydrogen production equipment side currently being in the normal mode.

[0150] In this way, through the transmission and processing of the first power limit flag signal and the second power limit flag signal, efficient coordination between the hydrogen production equipment side and the wind turbine generator set side is achieved, thereby improving the overall reliability of the system.

[0151] It is worth noting that at any point in time, the hydrogen production equipment side will only be in one of the emergency mode or the normal mode, so there will only be one corresponding power limit flag signal. If the hydrogen production equipment side is in the emergency mode, the first power limit flag signal will be activated (or set to "true" or "1"), and the second power limit flag signal will be turned off (or set to "false" or "0"). On the contrary, if the hydrogen production equipment side is in the normal mode, the second power limit flag signal will be activated, and the first power limit flag signal will be turned off.

[0152] In order to more clearly illustrate the above method, the present application provides a specific embodiment.

[0153] A coordinated control system for off-grid hydrogen production based on source-load grid construction, such as Figure 5 and Figure 6 As shown, it mainly includes the following parts:

[0154] Wind turbine side; it includes a doubly-fed induction generator and a doubly-fed AC generator connected to it.

[0155] The power grid is electrically connected between the first transformer and the second transformer through a switch KM1.

[0156] On the hydrogen production equipment side, the AC / DC uncontrolled rectifier, DC / DC controller, switch KM4 and electrolyzer are electrically connected in sequence.

[0157] Among them, the stator of the doubly fed induction generator is electrically connected to the hydrogen production equipment side through switch KM3, the first transformer, and the second transformer in sequence, the rotor of the doubly fed induction generator is connected to the input end of the first transformer through the doubly fed AC and switch KM2, and the power grid is electrically connected between the first transformer and the second transformer through switch KM1.

[0158] Here’s how it works:

[0159] In the grid-connected power generation mode, switch KM1 is closed, switch KM4 is open, and switches KM2 and KM3 are closed. At this time, the grid provides a stable power supply to the double-fed induction generator through the first transformer, and the electric energy generated by the double-fed induction generator is regulated by the double-fed AC converter and then fed back to the grid through the first transformer, completing the grid-connected power generation process.

[0160] When entering the off-grid hydrogen production mode, switch KM1 is opened, switch KM4 is closed, and switches KM2 and KM3 are closed. At this time, the doubly-fed induction generator no longer interacts directly with the grid, but transmits electrical energy to the hydrogen production equipment side through the first transformer and the second transformer. After being converted by the AC / DC uncontrolled rectifier and the DC / DC controller, the electrical energy is supplied to the electrolyzer for water electrolysis reaction, thereby producing hydrogen.

[0161] In order to ensure the stable operation of the system in different modes, this embodiment also proposes a corresponding collaborative control strategy.

[0162] Among them, in the off-grid hydrogen production mode, the working modes of the hydrogen production equipment side and the wind turbine side include normal mode and emergency mode.

[0163] The normal mode on the hydrogen production equipment side is: the output voltage of the AC / DC uncontrolled rectifier is stable at the preset voltage value;

[0164] Its emergency mode is: through constant power control, the output power of the electrolyzer is limited so that it does not exceed the preset power limit threshold;

[0165] The normal mode on the wind turbine side is: the output power of the generator is greater than the required power of the electrolyzer, and the required power response speed of the electrolyzer is faster than the output power setting value of the generator;

[0166] Its emergency mode is: through PU droop control, the output power of the generator is stabilized at the power limit threshold of the electrolyzer, thereby stabilizing the grid voltage

[0167] Based on the above two modes, the modes can be switched as follows:

[0168] Example 1: The system switches from normal mode to emergency mode.

[0169] When it is detected that the output power of the electrolyzer exceeds the preset power limit threshold, the hydrogen production equipment side will generate a first power limit flag signal and send it to the wind turbine side. At this time, the hydrogen production equipment side switches from normal mode to emergency mode.

[0170] After receiving the first power limit flag signal, the wind turbine side starts to monitor the converter DC side bus voltage; if the converter DC side bus voltage is higher than the preset voltage value, the wind turbine side switches from normal mode to emergency mode.

[0171] Example 2: Based on Example 1, the system switches from emergency mode to normal mode.

[0172] In emergency mode, if the output voltage of the AC / DC uncontrolled rectifier drops below the preset voltage value, the hydrogen production equipment side will generate a second power limit flag signal and send it to the wind turbine side. At this time, the hydrogen production equipment side switches from emergency mode to normal mode.

[0173] After the wind turbine side receives the second power limit flag signal, the wind turbine side checks whether the AC bus voltage is lower than the set voltage value. If the AC bus voltage is indeed lower than the set value, the wind turbine side switches from emergency mode to normal mode.

[0174] Exemplarily, the first power limit flag signal and the second power limit flag signal in the above Examples 1 and 2 are both digital signals. The first power limit flag signal is 1, indicating that the hydrogen production equipment side switches from normal mode to emergency mode, that is, the hydrogen production equipment side is currently in emergency mode; the second power limit flag signal is 0, indicating that the hydrogen production equipment side switches from emergency mode to normal mode, that is, the hydrogen production equipment side is currently in normal mode.

[0175] In this way, the collaborative control system of the present application adopts the PU droop control strategy. In the off-grid hydrogen production mode, the grid voltage is stabilized by adjusting the output power of the generator, solving the problem that the traditional QU control cannot effectively adjust the voltage. And by accurately controlling the output power of the generator and the operating status of the hydrogen production equipment, the present application can maintain the stability of the grid voltage and improve the stability and reliability of the system.

[0176] Fig.10 800 is a schematic structural diagram of a computing device 800 provided in an embodiment of the present application. The computing device can be used as a resource scheduling device for a multi-core processor partition operating system, and executes each optional embodiment of the resource scheduling method for a multi-core processor partition operating system. The computing device can be a terminal, or a chip or chip system inside a terminal. Fig.10 As shown, the computing device 800 includes: a processor 810 , a memory 820 , and a communication interface 830 .

[0177] It should be understood that Fig.10 The communication interface 830 in the computing device 800 shown may be used to communicate with other devices, and may specifically include one or more transceiver circuits or interface circuits.

[0178] The processor 810 may be connected to a memory 820. The memory 820 may be used to store the program code and data. Therefore, the memory 820 may be a storage unit inside the processor 810, or an external storage unit independent of the processor 810, or a component including a storage unit inside the processor 810 and an external storage unit independent of the processor 810.

[0179] Optionally, the computing device 800 may further include a bus. The memory 820 and the communication interface 830 may be connected to the processor 810 via the bus. The bus may be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Fig.10 A line without an arrow is used to represent the bus, but this does not mean that there is only one bus or one type of bus.

[0180] It should be understood that in the embodiment of the present application, the processor 810 can adopt a central processing unit (CPU). The processor 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 gates 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, etc. Or the processor 810 uses one or more integrated circuits to execute related programs to implement the technical solutions provided in the embodiments of the present application.

[0181] The memory 820 may include a read-only memory and a random access memory, and provides instructions and data to the processor 810. A portion of the processor 810 may also include a nonvolatile random access memory. For example, the processor 810 may also store information on the device type.

[0182] When the computing device 800 is running, the processor 810 executes the computer-executable instructions in the memory 820 to perform any operation step of the above method and any optional embodiment thereof.

[0183] It should be understood that the computing device 800 according to the embodiment of the present application can correspond to the corresponding subjects in the methods according to the embodiments of the present application, and the above-mentioned and other operations and / or functions of each module in the computing device 800 are respectively for implementing the corresponding processes of each method of the present embodiment. For the sake of brevity, they will not be repeated here.

[0184] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0185] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0186] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0187] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0188] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0189] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0190] An embodiment of the present application also provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, it is used to execute the above method, which includes at least one of the solutions described in the above embodiments.

[0191] The computer storage medium of the embodiment of the present application can adopt any combination of one or more computer-readable media. Computer-readable media can be computer-readable signal media or computer-readable storage media. Computer-readable storage media can be, for example, but not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices or devices, or any combination of the above. More specific examples (non-exhaustive lists) of computer-readable storage media include: electrical connections with one or more wires, portable computer disks, hard disks, random access memories (RAM), read-only memories (ROM), erasable programmable read-only memories (EPROM or flash memory), optical fibers, portable compact disk read-only memories (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the above. In this document, computer-readable storage media can be any tangible medium containing or storing programs, which can be used by instruction execution systems, devices or devices or used in combination with them.

[0192] Computer-readable signal media may include data signals propagated in baseband or as part of a carrier wave, which carry computer-readable program code. Such propagated data signals may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. Computer-readable signal media may also be any computer-readable medium other than a computer-readable storage medium, which may send, propagate, or transmit a program for use by or in conjunction with an instruction execution system, apparatus, or device.

[0193] The program code embodied on the computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.

[0194] Computer program code for performing the operation of the present application can be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages, such as Java, Smalltalk, C++, and conventional procedural programming languages, such as "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as an independent software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer can be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or can be connected to an external computer (e.g., using an Internet service provider to connect through the Internet).

[0195] In addition, the words "first, second, third, etc." or module A, module B, module C and other similar terms in the specification and claims are only used to distinguish similar objects and do not represent a specific ordering of the objects. It can be understood that the specific order or sequence can be interchanged where permitted so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0196] In the above description, the numbers representing the steps, such as S110, S120, etc., do not necessarily mean that the steps will be executed in this manner. If permitted, the order of the steps can be interchanged or they can be executed simultaneously.

[0197] The term "comprising" as used in the description and claims should not be interpreted as being limited to what is listed thereafter; it does not exclude other elements or steps. Therefore, it should be interpreted as specifying the presence of the features, integers, steps or components mentioned, but does not exclude the presence or addition of one or more other features, integers, steps or components and groups thereof. Therefore, the expression "a device comprising means A and B" should not be limited to a device consisting of components A and B only.

[0198] References to "one embodiment" or "an embodiment" in this specification mean that a particular feature, structure, or characteristic described in conjunction with the embodiment is included in at least one embodiment of the present application. Therefore, the phrases "in one embodiment" or "in an embodiment" appearing in various places in this specification do not necessarily refer to the same embodiment, but may refer to the same embodiment. In addition, in one or more embodiments, the particular features, structures, or characteristics can be combined in any appropriate manner, as would be apparent to one of ordinary skill in the art from this disclosure.

[0199] Note that the above are only preferred embodiments of the present application and the technical principles used. Those skilled in the art will understand that the present application is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present application. Therefore, although the present application is described in more detail through the above embodiments, the present application is not limited to the above embodiments, and may also include more other equivalent embodiments without departing from the concept of the present application, all of which belong to the scope of protection of the present application.

Claims

1. A coordinated control system for off-grid hydrogen production based on source-load grid, characterized in that: include: Wind turbine side, power grid, hydrogen production equipment side; wherein the hydrogen production equipment side includes an AC / DC uncontrolled rectifier, a DC / DC controller, a switch KM4 and an electrolyzer electrically connected in sequence; The wind turbine generator set is electrically connected to the hydrogen production equipment through a first transformer and a second transformer in sequence, and the power grid is electrically connected between the first transformer and the second transformer through a switch KM1; The first transformer is used to realize voltage conversion between the power grid and the wind turbine generator set; The second transformer is used to realize voltage conversion between the wind turbine side and the hydrogen production equipment side; The switch KM1 is used to control the connection between the wind turbine generator set and the power grid; The switch KM4 is used to control the connection between the wind turbine side and the hydrogen production equipment side; In the grid-connected power generation mode, the switch KM1 is in a closed state, the switch KM4 is in an open state, the grid supplies power to the wind turbine side through the first transformer, and the wind turbine side transmits the generated electric energy to the grid through the first transformer; In the off-grid hydrogen production mode, the switch KM1 is in an open state, the switch KM4 is in a closed state, and the wind turbine generator system supplies power to the hydrogen production equipment side through the first transformer and the second transformer in sequence; Wherein, in the off-grid hydrogen production mode, the grid voltage is stabilized by controlling the active power balance output from the wind turbine side to the hydrogen production equipment side.

2. The collaborative control system according to claim 1, characterized in that: The wind turbine generator set side includes: a generator and a double-fed AC converter; The rotor of the generator is connected to the input end of the first transformer through the double-fed AC converter and the switch KM2; the stator of the generator is electrically connected to the input end of the first transformer through the switch KM3; The switch KM2 is used to control the on / off of the branch where the generator and the double-fed AC device are located; The switch KM3 is used to control the on / off between the generator and the first transformer; When the switch KM2 is in a closed state, the current on the rotor side of the generator flows to the double-fed AC converter for processing; when the switch KM2 is in an open state, the path is cut off; When the switch KM3 is in a closed state, the current on the stator side of the generator is allowed to flow to the first transformer for processing; when the switch KM3 is in an open state, the path is cut off.

3. The collaborative control system according to claim 2, characterized in that: The double-fed AC converter has current source characteristics.

4. A coordinated control method for off-grid hydrogen production based on source-load grid construction, characterized in that: Applied to the collaborative control system according to any one of claims 1 to 3, the method comprises: In the grid-connected power generation mode, the switch KM1 is in a closed state, the switch KM4 is in an open state, the grid supplies power to the wind turbine side through the first transformer, and the wind turbine side transmits the generated electric energy to the grid through the first transformer; In the off-grid hydrogen production mode, the switch KM1 is in an open state, the switch KM4 is in a closed state, and the wind turbine generator system supplies power to the hydrogen production equipment side through the first transformer and the second transformer in sequence; Wherein, in the off-grid hydrogen production mode, the grid voltage is stabilized by controlling the active power balance output from the wind turbine side to the hydrogen production equipment side.

5. The collaborative control method according to claim 4, characterized in that: In the off-grid hydrogen production mode, the working modes of the hydrogen production equipment side and the wind turbine generator side include a normal mode and an emergency mode; The normal mode of the hydrogen production equipment side is: the output voltage of the AC / DC uncontrolled rectifier is stabilized at a preset voltage value; The emergency mode is: through constant power control, the output power of the electrolyzer is limited so that it does not exceed a preset power limit threshold; The normal mode on the wind turbine side is: the output power of the generator is greater than the required power of the electrolyzer, and the required power response speed of the electrolyzer is faster than the output power setting value of the generator; the emergency mode is: through PU droop control, the output power of the generator is stabilized at the power limit threshold of the electrolyzer, thereby stabilizing the grid voltage.

6. The collaborative control method according to claim 5, characterized in that: The method further comprises: Obtaining the output power of the electrolyzer; When the obtained output power of the electrolyzer is greater than the preset power limit threshold, the hydrogen production equipment side generates a first power limit flag signal and sends it to the wind turbine side, and the hydrogen production equipment side switches from the normal mode to the emergency mode.

7. The collaborative control method according to claim 6, characterized in that: After the hydrogen production equipment side is switched from the normal mode to the emergency mode, the method further includes: The wind turbine generator set side receives the first power limit flag signal; Obtain the DC side bus voltage of the converter; When the acquired converter DC side bus voltage is greater than a preset voltage value, the wind turbine generator set side switches from the normal mode to the emergency mode.

8. The collaborative control method according to claim 7, characterized in that: The method further comprises: Obtaining the output voltage of the AC / DC uncontrolled rectifier on the hydrogen production equipment side; When the obtained output voltage of the AC / DC uncontrolled rectifier is less than a preset voltage value, the hydrogen production equipment side generates a second power limit flag signal and sends it to the wind turbine side, and the hydrogen production equipment side switches from the emergency mode to the normal mode.

9. The collaborative control method according to claim 8, characterized in that: After the hydrogen production equipment side is switched from the emergency mode to the normal mode, the method further includes: The wind turbine generator set side receives the second power limit flag signal; Get the AC bus voltage; When the acquired AC bus voltage is less than a set voltage value, the wind turbine generator set side switches from the emergency mode to the normal mode.

10. The collaborative control method according to claim 9, characterized in that: The first power limit flag signal and the second power limit flag signal are the current operation modes of the hydrogen production equipment side; The first power limit flag signal corresponds to the hydrogen production equipment side currently being in the emergency mode; The second power limit flag signal corresponds to the hydrogen production equipment side currently being in the normal mode.

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