Control method and device of hydrogen production power supply, electronic equipment and storage medium

Abstract

The invention relates to a control method and device of a hydrogen production power supply, electronic equipment and a storage medium. The hydrogen production power supply comprises at least two rectifier bridges which are connected in parallel. The control method of the hydrogen production power supply comprises the following steps: acquiring a first direct-current output current and a plurality of second direct-current output currents; wherein the first direct-current output current is the current of the output side of the hydrogen production power supply, and the second direct-current output current is the current of the output side of the rectifier bridge; obtaining a reference current and a current-sharing current; determining a common trigger angle according to the deviation between the first direct-current output current and the reference current, and respectively determining a compensation trigger angle corresponding to each rectifier bridge according to the deviation between each second direct-current output current and the current-sharing current; and controlling each rectifier bridge according to the compensation trigger angle and the common trigger angle corresponding to each rectifier bridge, so as to adjust the second direct current output current corresponding to each rectifier bridge into a current-sharing current. According to the technical scheme, the technical problem that the load current distribution of the rectifier in the hydrogen production power supply is not uniform is solved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of power supply, in particular to a control method and device of a hydrogen production power supply, an electronic device and a storage medium. BACKGROUND

[0002] As a key equipment connecting the power grid and the electrolytic cell, the performance of the hydrogen production power supply directly affects the hydrogen production efficiency and system stability, and becomes a technical cornerstone for the large-scale development of the hydrogen energy industry.

[0003] The hydrogen production power supply is usually composed of multiple sets of parallel rectifiers. In actual production, due to the manufacturing tolerances of the internal components of each set of rectifiers, the electrical parameters of each set of rectifiers are difficult to be completely consistent. Such differences in electrical parameters lead to uneven distribution of load currents of each set of rectifiers, resulting in differences in heat dissipation of each part of the hydrogen production power supply, which seriously affects the service life and operation safety of the hydrogen production power supply.

[0004] Therefore, it is necessary to provide a control method and device of a hydrogen production power supply, an electronic device and a storage medium to solve the technical problem of uneven distribution of load currents of rectifiers in the hydrogen production power supply. SUMMARY

[0005] Therefore, it is necessary to provide a control method and device of a hydrogen production power supply, an electronic device and a storage medium to solve the technical problem of uneven distribution of load currents of rectifiers in the hydrogen production power supply.

[0006] In a first aspect, the application provides a control method of a hydrogen production power supply, the hydrogen production power supply comprising at least two parallel rectifier bridges, the control method comprising:

[0007] obtaining a first direct current output current and a plurality of second direct current output currents; wherein the first direct current output current is a current at an output side of the hydrogen production power supply, and the second direct current output current is a current at an output side of the rectifier bridge;

[0008] obtaining a reference current and a current sharing current;

[0009] determining a common trigger angle according to a deviation between the first direct current output current and the reference current, and determining a corresponding compensation trigger angle of each rectifier bridge according to a deviation between each second direct current output current and the current sharing current;

[0010] controlling each rectifier bridge according to the corresponding compensation trigger angle and the common trigger angle, so as to adjust the corresponding second direct current output current of each rectifier bridge to the current sharing current.

[0011] In one embodiment, the common trigger angle is determined according to the deviation between the first direct current output current and the reference current, comprising:

[0012] first-order low-pass filter the first direct current output current to obtain a feedback current corresponding to the first direct current output current;

[0013] input a difference between the feedback current and the reference current to a proportional-integral controller, and calculate the common trigger angle by the proportional-integral controller.

[0014] In one of the embodiments, the compensating trigger angle corresponding to each of the rectifier bridges is determined according to a deviation between each of the second direct current output currents and the current sharing current, which comprises:

[0015] input a difference between the second direct current output current of the nth rectifier bridge and the current sharing current to a hysteresis comparator, and calculate the compensating trigger angle corresponding to the nth rectifier bridge by the hysteresis comparator; wherein n is an integer greater than or equal to 2.

[0016] In one of the embodiments, the hysteresis comparator has a hysteresis width H, and the compensating trigger angle corresponding to the nth rectifier bridge is calculated by the hysteresis comparator, which comprises:

[0017] when the difference between the second direct current output current of the nth rectifier bridge and the current sharing current is within an error band of the hysteresis comparator, the hysteresis comparator determines that the compensating trigger angle corresponding to the nth rectifier bridge is 0; wherein the error band ranges from -H to H;

[0018] when the difference between the second direct current output current of the nth rectifier bridge and the current sharing current is less than the minimum value of the error band, the hysteresis comparator determines that the compensating trigger angle corresponding to the nth rectifier bridge is a first angle; wherein the first angle is a negative value;

[0019] when the difference between the second direct current output current of the nth rectifier bridge and the current sharing current is greater than the maximum value of the error band, the hysteresis comparator determines that the compensating trigger angle corresponding to the nth rectifier bridge is a second angle; wherein the second angle is a positive value, and the absolute value of the second angle is equal to that of the first angle.

[0020] In one of the embodiments, the reference current and the current sharing current are obtained by:

[0021] calling a preset reference current;

[0022] calculating a quotient of the reference current and the number of the rectifier bridges in the hydrogen production power supply to obtain the current sharing current.

[0023] In one of the embodiments, the first direct current output current and the plurality of second direct current output currents are obtained by:

[0024] The first direct current output current is sampled by a first current sensor, wherein the first current sensor is arranged on an output side direct current bus of the hydrogen production power supply.

[0025] The second direct current output currents are respectively sampled by a plurality of second current sensors, wherein the plurality of second current sensors are respectively arranged on output side direct current buses of the rectifier bridges.

[0026] In one of the embodiments, the rectifier bridge is a three-phase thyristor rectifier bridge, and the control of each rectifier bridge according to the corresponding compensation trigger angle and the common trigger angle includes:

[0027] The sum of the corresponding compensation trigger angle and the common trigger angle of each rectifier bridge is calculated to obtain an independent trigger angle corresponding to each rectifier bridge.

[0028] The alternating current input voltage of each rectifier bridge is sampled by a plurality of voltage sensors, wherein the plurality of voltage sensors are respectively connected in parallel to any two-phase alternating current side lines on the input side of each rectifier bridge.

[0029] The alternating current input voltage of the nth rectifier bridge is input to a phase-locked loop, and the phase synchronization signal corresponding to the nth rectifier bridge is calculated by the phase-locked loop; wherein n is an integer greater than or equal to 2.

[0030] According to the phase synchronization signal corresponding to the nth rectifier bridge and the independent trigger angle, the thyristor gate drive pulse corresponding to the nth rectifier bridge is determined to control the nth rectifier bridge through the thyristor gate drive pulse.

[0031] In a second aspect, the application provides a control device of a hydrogen production power supply, the control device comprising:

[0032] A first acquisition module is configured to acquire a first direct current output current and a plurality of second direct current output currents, wherein the first direct current output current is the current on the output side of the hydrogen production power supply, and the second direct current output current is the current on the output side of the rectifier bridge.

[0033] A second acquisition module is configured to acquire a reference current and an equalization current.

[0034] A determination module is configured to determine a common trigger angle according to the deviation between the first direct current output current and the reference current, and determine a compensation trigger angle corresponding to each rectifier bridge according to the deviation between each second direct current output current and the equalization current.

[0035] The control module is configured to control each rectifier bridge according to the common trigger angle and the compensation trigger angle corresponding to each rectifier bridge, so as to adjust the second direct current output of each rectifier bridge to the current sharing current.

[0036] In a third aspect, the present application provides an electronic device, comprising a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the control method of the hydrogen production power supply according to any one of the embodiments of the first aspect when executing the computer program.

[0037] In a fourth aspect, the present application provides a computer readable storage medium, which stores a computer program, and the computer program implements the steps of the control method of the hydrogen production power supply according to any one of the embodiments of the first aspect when executed by a processor.

[0038] In the technical solution provided in the present application, for the hydrogen production power supply comprising multiple rectifier bridges, first, the common trigger angle acting on the hydrogen production power supply as a whole is determined based on the deviation of the first direct current output of the hydrogen production power supply as a whole from the reference current, and then the compensation trigger angle of each rectifier bridge is determined based on the deviation of the second direct current output of each rectifier bridge from the current sharing current. When the hydrogen production power supply is controlled, the independent trigger angle corresponding to each rectifier bridge is obtained by modifying the common trigger angle by the compensation trigger angle, so that the second direct current output of each rectifier bridge can be adjusted to the current sharing current under the control of the corresponding independent trigger angle, and the second direct current outputs of each rectifier bridge are adjusted to be equal, thereby solving the technical problem of uneven load current distribution of the rectifier in the hydrogen production power supply. BRIEF DESCRIPTION OF DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0040] Figure 1 It is a flowchart of a control method of a hydrogen production power supply;

[0041] Figure 2 It is a flowchart of a control method of a hydrogen production power supply in an embodiment;

[0042] Figure 3 It is a control flowchart in a hysteresis comparator;

[0043] Figure 4 It is a flowchart of a control method of a hydrogen production power supply in another embodiment;

[0044] Figure 5 Flowchart of a control method of a hydrogen production power supply in an embodiment;

[0045] Figure 6 Flowchart of a control method of a hydrogen production power supply in another embodiment;

[0046] Figure 7 Structure diagram of a twelve-pulse hydrogen production power supply;

[0047] Figure 8 Control logic diagram of a control method of a hydrogen production power supply;

[0048] Figure 9 Waveform diagram of a direct current output current of a three-phase thyristor rectifier bridge in a twelve-pulse hydrogen production power supply;

[0049] Figure 10 Structure diagram of a control device of a hydrogen production power supply;

[0050] Figure 11 Internal structure diagram of an electronic device in an embodiment. DETAILED DESCRIPTION

[0051] In order to facilitate the understanding of the present application, a more comprehensive description of the present application will be made below with reference to the relevant drawings. The drawings show embodiments of the present application. However, the present application can be realized in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0052] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0053] It can be understood that the terms "first", "second", and the like used in the present application can be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish the first element from another element. For example, without departing from the scope of the present application, the first resistor can be referred to as the second resistor, and similarly, the second resistor can be referred to as the first resistor. The first resistor and the second resistor are both resistors, but they are not the same resistor.

[0054] It can be understood that "connection" in the following embodiments, if the circuits, modules, units, etc. connected to each other have the transmission of electrical signals or data, it should be understood as "electrically connected", "communicatively connected", etc.

[0055] It is understandable that "at least one" refers to one or more, and "multiple" refers to two or more. "At least a part of an element" refers to part or all of an element.

[0056] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising / including” or “having,” etc., specify the presence of the stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. Meanwhile, the term “and / or” as used in this specification includes any and all combinations of the associated listed items.

[0057] In hydrogen production applications via water electrolysis, hydrogen production power supplies typically employ a parallel architecture of multiple rectifier bridges to meet the enormous current demands. However, in actual production, due to unavoidable manufacturing tolerances, material parameter differences, and characteristic drift with time and temperature variations among the components within each parallel rectifier bridge, it is difficult to achieve complete consistency in the electrical parameters of each parallel branch. This inconsistency in electrical parameters leads to uneven distribution of load current among the rectifier bridges. Some rectifier bridges may operate under overload conditions for extended periods, resulting in localized overheating and accelerated device aging; while other rectifier bridges may operate under light load conditions, failing to fully utilize their capacity. This uneven load current not only reduces the overall operating efficiency and reliability of the hydrogen production power supply but, more seriously, may cause equipment failure due to localized overheating or overcurrent, affecting production safety. To address these issues, embodiments of this application provide a control method, apparatus, electronic device, and storage medium for a hydrogen production power supply.

[0058] The hydrogen production power supply control method provided in this application is applied to a hydrogen production power supply containing multiple parallel rectifier bridges, specifically in the controller of the hydrogen production power supply. This hydrogen production power supply is deployed between the power grid and the electrolyzer, and utilizes multiple internally connected parallel rectifier bridges to convert AC power from the power grid into DC power, thereby providing a stable operating voltage to the electrolyzer for hydrogen electrolysis.

[0059] Reference Figure 1 In one embodiment, a method for controlling a hydrogen production power source is provided, the method specifically including the following steps:

[0060] S100: Obtain the first DC output current and multiple second DC output currents.

[0061] The first DC output current is the current on the output side of the hydrogen production power supply, and the second DC output current is the current on the output side of the rectifier bridge.

[0062] Specifically, the controller acquires the first DC output current of the hydrogen production power supply and the plurality of second DC output currents. The first DC output current is the voltage on the positive DC bus at the output end of the hydrogen production power supply. The second DC output current is the current on the line before the parallel point at the output end of each rectifier bridge.

[0063] As an example, the controller can acquire the voltage and current parameters of the hydrogen production power supply through various types of sensing devices arranged in the hydrogen production power supply. For example, the first DC output current is acquired through a Hall current sensor arranged on the output side DC bus of the hydrogen production power supply, and the plurality of second DC output currents of the rectifier bridge are acquired through a Hall current sensor arranged on the output side DC bus of the rectifier bridge.

[0064] S200: Acquire reference current and current sharing current.

[0065] Specifically, the controller acquires the reference current and the current sharing current. The reference current is the control target value of the controller for the first DC output current, and the current sharing current is the control target value of the controller for the second DC output current. As an example, the reference current and the current sharing current are stored in the non-volatile storage structure of the controller, and the controller reads the reference current and the current sharing current from the non-volatile storage structure.

[0066] As an example, the reference current and the current sharing current can be values freely set by a person skilled in the art in the human-machine interface of the hydrogen production power supply in advance. When a person skilled in the art freely sets the reference current and the current sharing current, the working current of the electrolytic cell acted on by the hydrogen production power supply can be referred to, and the reference current and the current sharing current can be set according to the working current of the electrolytic cell, respectively.

[0067] As an example, the reference current and the current sharing current can also be dynamically issued according to actual production conditions. For example, the reference current can be dynamically issued by the upper management system of the hydrogen production power supply according to the phased production plan, and the current sharing current can be dynamically calculated and generated according to the real-time working condition of each rectifier bridge.

[0068] It can be understood that since the control of each rectifier bridge in the hydrogen production power supply will refer to the same current sharing current, regardless of the way the current sharing current is determined, the current sharing of each rectifier part of the hydrogen production power supply is achieved.

[0069] S300: Determine the common trigger angle according to the deviation of the first DC output current and the reference current, and determine the corresponding compensation trigger angle of each rectifier bridge according to the deviation of each second DC output current and the current sharing current, respectively.

[0070] Specifically, the reference current is taken as a control target value of the controller for the first direct current output current, the current-sharing current is taken as a control target value of the controller for the second direct current output current, the common trigger angle is determined according to a deviation between the first direct current output current and the reference current, and the compensation trigger angle corresponding to each rectifier bridge is determined according to a deviation between each second direct current output current and the current-sharing current.

[0071] The common trigger angle and the compensation trigger angle are both trigger angles, and the trigger angle is an electrical angle difference between a time when a switching device of the rectifier bridge starts to conduct and a natural commutation point. In this embodiment, the common trigger angle is used to realize overall control of each rectifier bridge in the hydrogen production power supply, so as to ensure that the first direct current output current of the hydrogen production power supply tracks the reference current. The compensation trigger angle is used to eliminate the difference between the second direct current output currents of each rectifier bridge, so as to ensure that the direct current output currents of each rectifier bridge track the current-sharing current.

[0072] In this embodiment, the common trigger angle and the compensation trigger angle can be generated based on multiple ways. For example, the deviation between the first direct current output current and the reference current can be processed by any one of a proportional-integral controller, a fuzzy logic controller, a proportional-integral-derivative controller and a hysteresis comparator to obtain the common trigger angle, and the deviation between each second direct current output current and the current-sharing current can be processed by any one of the proportional-integral controller, the fuzzy logic controller, the proportional-integral-derivative controller and the hysteresis comparator to obtain the compensation trigger angle corresponding to each rectifier bridge.

[0073] As an example, the common trigger angle and the compensation trigger angle can both be generated based on a proportional-integral-derivative controller. The controller calls the proportional-integral-derivative controller, inputs the deviation between the first direct current output current and the reference current into the proportional-integral-derivative controller to obtain the common trigger angle, and inputs the deviation between each second direct current output current and the current-sharing current into the proportional-integral-derivative controller to obtain the compensation trigger angle corresponding to each rectifier bridge.

[0074] As an example, the common trigger angle and the compensation trigger angle can both be generated based on a fuzzy logic controller. The controller calls the fuzzy logic controller, and expert rules are preset in the fuzzy logic controller. The expert rules define a corresponding relationship between the deviation between the first direct current output current and the reference current and the common trigger angle, and define a corresponding relationship between the deviation between each second direct current output current and the current-sharing current and the compensation trigger angle. The deviation between the first direct current output current and the reference current is input into the fuzzy logic controller to obtain the corresponding common trigger angle, and the deviation between each second direct current output current and the current-sharing current is input into the fuzzy logic controller to obtain the compensation trigger angle corresponding to each rectifier bridge.

[0075] S400: Control each rectifier bridge according to the compensation trigger angle corresponding to each rectifier bridge and the common trigger angle, so as to adjust each second direct current output current corresponding to each rectifier bridge to the current-sharing current.

[0076] Specifically, when the common trigger angle acts on each rectifier bridge, the first direct current output current tries to track the reference current, and when the compensation trigger angle acts on the corresponding rectifier bridge, the second direct current output current of the corresponding rectifier bridge tries to track the current sharing current. According to the control of the compensation trigger angle and the common trigger angle on each rectifier bridge, the first direct current output current of the hydrogen production power supply can be aligned with the reference current while ensuring that the second direct current output current of each rectifier bridge can be aligned with the current sharing current, and the second direct current output current of each rectifier bridge is equal after adjustment, thereby realizing current sharing of each rectifier bridge in the hydrogen production power supply.

[0077] In the technical solutions provided in the present application, for a hydrogen production power supply including multiple rectifier bridges, a common trigger angle acting on the hydrogen production power supply as a whole is first determined based on the deviation of the first direct current output current of the hydrogen production power supply as a whole from the reference current, and then a compensation trigger angle of each rectifier bridge is determined based on the deviation of the second direct current output current of each rectifier bridge from the current sharing current. When the hydrogen production power supply is controlled, the independent trigger angle corresponding to each rectifier bridge is obtained by modifying the common trigger angle by the compensation trigger angle, so that the second direct current output current of each rectifier bridge can be adjusted to the current sharing current under the control of the corresponding independent trigger angle, and the second direct current output currents of each rectifier bridge are equal, thereby solving the technical problem of uneven load current distribution of the rectifier in the hydrogen production power supply.

[0078] Reference Figure 2 In one embodiment, S300, the common trigger angle is determined according to the deviation of the first direct current output current from the reference current, comprising:

[0079] S310: First-order low-pass filtering the first direct current output current to obtain a feedback current corresponding to the first direct current output current.

[0080] S320: Inputting the difference between the feedback current and the reference current to a proportional-integral controller to calculate the common trigger angle by the proportional-integral controller.

[0081] The common trigger angle is represented as follows:

[0082] ;

[0083] Wherein, a is the common trigger angle, Id err is the difference between the feedback current and the reference current, Kp is the proportional coefficient of the proportional-integral controller, Ki is the integral coefficient of the proportional-integral controller, and s represents the denominator of the integral operation in the Laplace frequency domain.

[0084] Specifically, the controller calls a first-order low-pass filter to filter the first direct current output current, eliminating the voltage ripple existing in the first direct current output voltage, and obtaining a smooth feedback current.

[0085] Subsequently, the controller calculates the difference between the feedback current and the reference current, inputs the difference between the feedback current and the reference current into a proportional integral controller called, so as to obtain the corresponding common trigger angle. The proportional coefficient of the proportional integral controller is used to respond quickly to the deviation of the feedback current and the reference current, and the integral coefficient of the proportional integral controller is used to eliminate steady-state error and ensure that the first direct current output voltage can be accurately stabilized on the reference current.

[0086] As an example, the proportional coefficient and the integral coefficient of the proportional integral controller are pre-configured parameters, which are determined by a person skilled in the art in advance. As an example, an adaptive control algorithm is introduced into the proportional integral controller, the performance indicators of the proportional integral controller, such as the response time and the overshoot of the proportional integral controller, are monitored online, and the gain of the proportional integral controller is adjusted in real time according to the performance indicators of the proportional integral controller, so that the proportional coefficient and the integral coefficient of the proportional integral controller adaptively change according to the actual working conditions.

[0087] In this embodiment, the common trigger angle is generated by the proportional integral controller, the proportional integral controller can quickly respond to the change of the first direct current output current of the hydrogen production power supply, generate the corresponding common trigger angle, and the implementation is simple. Through the technical scheme provided by the embodiment, the accuracy of the generation of the common trigger angle is ensured by a relatively simple control scheme.

[0088] Continuing to refer to Figure 2 In one embodiment, S300, the compensation trigger angle corresponding to each rectifier bridge is determined according to the deviation of each second direct current output current and the current sharing current, comprising:

[0089] S330: respectively input the difference between the second direct current output current and the current sharing current of the nth rectifier bridge to the hysteresis comparator, and calculate the compensation trigger angle corresponding to the nth rectifier bridge through the hysteresis comparator.

[0090] Wherein, n is an integer greater than or equal to 2.

[0091] Specifically, the hysteresis comparator is a kind of nonlinear controller, the hysteresis comparator has an upper threshold and a lower threshold, and the error band of the hysteresis comparator is between the upper threshold and the lower threshold, and the range of the error band is the hysteresis comparator's loop width. The difference between the second direct current output current and the current sharing current of the nth rectifier bridge is input to the hysteresis comparator, and the hysteresis comparator outputs the compensation trigger angle corresponding to the nth rectifier bridge. Since the output value of the hysteresis comparator is discrete, the angle value of the compensation trigger angle is actually a plurality of discrete fixed values.

[0092] As an example, for a hydrogen production power supply including n rectifier bridges, n hysteresis comparators can be provided, one-to-one corresponding to the rectifier bridges. For example, when calculating the compensation trigger angle of the first rectifier bridge, the first hysteresis comparator is called. As an example, for a hydrogen production power supply including n rectifier bridges, only one hysteresis comparator can also be provided, and the compensation trigger angles of the respective rectifier bridges are output by the same hysteresis comparator.

[0093] The decision-making process of the hysteresis comparator only involves simple numerical comparison, comparing the input value with the upper threshold and lower threshold of the hysteresis comparator to determine the corresponding output value. Through the technical solutions provided by the embodiment, the controller can output the compensation trigger angle corresponding to the rectifier bridge at the moment when the current deviation is detected, with fast response speed, ensuring that the hydrogen production power supply can balance the load current in a short time.

[0094] Reference Figure 3 In one embodiment, the hysteresis comparator has a hysteresis width H, and calculating the compensation trigger angle corresponding to the nth rectifier bridge by the hysteresis comparator includes:

[0095] S331: determining whether the difference between the second DC output current of the nth rectifier bridge and the current sharing current is within the error band of the hysteresis comparator.

[0096] S332: when the difference between the second DC output current of the nth rectifier bridge and the current sharing current is within the error band of the hysteresis comparator, the hysteresis comparator determines that the compensation trigger angle corresponding to the nth rectifier bridge is 0.

[0097] wherein the range of the error band is [-H, H].

[0098] S333: when the difference between the second DC output current of the nth rectifier bridge and the current sharing current is less than the minimum value of the error band, the hysteresis comparator determines that the compensation trigger angle corresponding to the nth rectifier bridge is the first angle.

[0099] wherein the first angle is a negative value.

[0100] S334: when the difference between the second DC output current of the nth rectifier bridge and the current sharing current is greater than the maximum value of the error band, the hysteresis comparator determines that the compensation trigger angle corresponding to the nth rectifier bridge is the second angle.

[0101] wherein the second angle is a positive value, and the absolute value of the second angle is equal to that of the first angle.

[0102] Specifically, for any rectifier bridge, after inputting the difference between the second DC output current and the current sharing current to the hysteresis comparator, the hysteresis comparator determines whether the difference between the second DC output current and the current sharing current is within the error band, and outputs differently based on the comparison result.

[0103] When the difference between the second DC output current and the current sharing current is within the error band of the hysteresis comparator, the controller determines that the second DC output current and the current sharing current of the rectifier bridge are close enough to be in a balanced state. Therefore, the hysteresis comparator determines that the compensation trigger angle thereof is 0, and the corresponding independent trigger angle of the rectifier bridge is the common trigger angle.

[0104] When the difference between the second DC output current and the current sharing current is not within the error band of the hysteresis comparator and the difference between the second DC output current and the current sharing current is less than the minimum value of the error band, the controller determines that the load of the rectifier bridge is too light, and the output current thereof is lower than the lower limit of the error band. Therefore, the hysteresis comparator determines that the compensation trigger angle thereof is the first angle, which is a fixed negative value, and the corresponding independent trigger angle of the rectifier bridge is the sum of the common trigger angle and the first angle. Since the first angle is negative, the corresponding independent trigger angle of the rectifier bridge is reduced compared to before the adjustment, the thyristor in the rectifier bridge is turned on earlier, the DC output voltage of the rectifier bridge is increased, and the first DC output current of the rectifier bridge is increased, thereby correcting the excessively small first DC current.

[0105] When the difference between the second DC output current and the current sharing current is not within the error band of the hysteresis comparator and the difference between the second DC output current and the current sharing current is greater than the maximum value of the error band, the controller determines that the load of the rectifier bridge is too heavy, and the output current thereof is higher than the upper limit of the error band. Therefore, the hysteresis comparator determines that the compensation trigger angle thereof is the second angle, which is a fixed positive value, and the corresponding independent trigger angle of the rectifier bridge is the sum of the common trigger angle and the second angle. Since the second angle is positive, the corresponding independent trigger angle of the rectifier bridge is increased compared to before the adjustment, the thyristor in the rectifier bridge is turned on later, the DC output voltage of the rectifier bridge is decreased, and the first DC output current of the rectifier bridge is decreased, thereby correcting the excessively large first DC current.

[0106] Since a smaller hysteresis width means higher current sharing accuracy, but can cause the controller to frequently act near the balance point, a larger hysteresis width can reduce the switching frequency and reduce unnecessary adjustment, but can sacrifice some current sharing accuracy. Therefore, the hysteresis width of the hysteresis comparator can be freely set by those skilled in the art according to the adjustment requirements of the hydrogen production power supply.

[0107] In this embodiment, no matter how large the deviation between the second DC output current and the current sharing current is, the output of the compensation trigger angle is always limited within three determined values. This technical solution of setting the compensation trigger angle to three fixed values ensures that the controller will not over-adjust when adjusting each rectifier bridge, effectively improving the stability of the current sharing control. On the other hand, the hysteresis comparator is used to realize the output of the compensation trigger angle, and the hysteresis comparator can freely set the hysteresis width, which makes the current sharing control applicable to different production scenarios and has good flexibility.

[0108] Referring to Figure 4 In one embodiment, S200, obtaining the reference current and the current-sharing current, comprises:

[0109] S210: calling the preset reference current.

[0110] S220: calculating the quotient of the reference current and the number of rectifier bridges in the hydrogen production power supply to obtain the current-sharing current.

[0111] Specifically, the reference current is pre-stored in the controller, and the controller directly calls the preset reference current from its own non-volatile storage structure. In some specific examples, the reference current is equal to the rated working current of the electrolytic cell acted on by the hydrogen production power supply.

[0112] The current-sharing current is calculated according to the reference current, and in this embodiment, the current-sharing current is equal to the quotient of the reference current and the number of rectifier bridges in the hydrogen production power supply. For example, if there are currently 3 rectifier bridges, and the current reference current is set to Idref1, then the current-sharing current Idref2 is equal to 1 / 3 (Idref1).

[0113] In this embodiment, the hydrogen production power supply first needs to complete the adjustment of the overall first direct current output current based on the reference current, and when the first direct current output current tracks the reference current, the current hydrogen production power supply is normally working and stable. Setting the current-sharing current as the quotient of the reference current and the number of rectifier bridges in the hydrogen production power supply ensures that when the current-sharing control of the hydrogen production power supply is performed, the control target value is adapted to the normal working state of the hydrogen production power supply, effectively ensuring the working stability of the hydrogen production power supply.

[0114] Referring to Figure 5 In one embodiment, S100, obtaining the first direct current output current and the plurality of second direct current output currents, comprises:

[0115] S110: obtaining the first direct current output current by sampling through a first current sensor.

[0116] The first current sensor is arranged on the output side DC bus of the hydrogen production power supply.

[0117] S120: obtaining the plurality of second direct current output currents by sampling through a plurality of second current sensors respectively.

[0118] The plurality of second current sensors are arranged on the output side DC bus of each rectifier bridge respectively.

[0119] Specifically, the electrical parameters of the hydrogen production power supply are monitored by a plurality of current sensors arranged in the hydrogen production power supply. Specifically, a first DC output current is sampled by a first current sensor arranged on the output side DC bus of the hydrogen production power supply, and a plurality of second DC output currents are sampled by a plurality of second current sensors arranged on the output side DC bus of the rectifier bridge respectively. The first current sensor and the second current sensor are connected with the controller of the hydrogen production power supply, and the electrical parameters collected by themselves are transmitted to the controller.

[0120] As an example, the first current sensor and the second current sensor can both be Hall current sensors, and the ranges of the first current sensor and the second current sensor are different. The first current sensor is arranged as a Hall current sensor with a large range to adapt to the first DC output current with a larger current value, and the second current sensor is arranged as a Hall current sensor with a small range to ensure accurate measurement of the second DC output current.

[0121] Referring to Figure 6 In one embodiment, the rectifier bridge is a three-phase thyristor rectifier bridge S400, and each rectifier bridge is controlled according to the corresponding compensation trigger angle and the common trigger angle, including:

[0122] S410: The sum of the corresponding compensation trigger angle and the common trigger angle of each rectifier bridge is calculated respectively to obtain the independent trigger angle corresponding to each rectifier bridge.

[0123] S420: The AC input voltage of each rectifier bridge is sampled by a plurality of voltage sensors.

[0124] Among them, the plurality of voltage sensors are respectively connected in parallel to any two-phase AC side lines on the input side of each rectifier bridge.

[0125] S430: The AC input voltage of the nth rectifier bridge is input to the phase-locked loop respectively, and the phase synchronization signal corresponding to the nth rectifier bridge is calculated by the phase-locked loop.

[0126] Among them, n is an integer greater than or equal to 2.

[0127] S440: The gate drive pulse corresponding to the nth rectifier bridge is determined according to the phase synchronization signal corresponding to the nth rectifier bridge and the independent trigger angle, so as to control the nth rectifier bridge through the gate drive pulse of the thyristor.

[0128] Specifically, when the common trigger angle acts on each rectifier bridge, the first direct current output voltage attempts to reference the current, and when the compensation trigger angle acts on its corresponding rectifier bridge, the second direct current output current of the corresponding rectifier bridge attempts to track the current. According to the sum of the compensation trigger angle and the common trigger angle corresponding to each rectifier bridge, the independent trigger angle corresponding to each rectifier bridge is calculated, and when each independent trigger angle acts on the corresponding rectifier bridge, respectively, the second direct current output current of each rectifier bridge is adjusted to the current, and the first direct current output voltage of the hydrogen production power supply is adjusted to the reference current. After calculating the independent trigger angle corresponding to each rectifier bridge, the alternating current input voltage of each rectifier bridge is obtained by sampling through a plurality of voltage sensors. The alternating current input voltage of the rectifier bridge is the voltage between any two phases of the input end of the rectifier bridge, which can be obtained through the voltage sensor arranged on the alternating current side line of any two phases of the rectifier bridge. The voltage sensor is connected with the controller, and the voltage sensor can be a Hall voltage sensor. Based on the alternating current input voltage of the rectifier bridge, the phase synchronization signal corresponding to the rectifier bridge is calculated through a phase-locked loop. The phase synchronization signal is usually a periodic sawtooth wave or cosine wave, and the zero crossing point or peak point of the phase synchronization signal is aligned with the specific phase point of the grid voltage, which provides a reliable time reference for the measurement of the trigger angle.

[0129] Through the above process, for any rectifier bridge in the hydrogen production power supply, the controller obtains the independent trigger angle corresponding to the rectifier bridge and the phase synchronization signal, and the controller generates the thyristor gate drive pulse acting on the thyristor in the rectifier bridge based on the independent trigger angle and the phase synchronization signal. The conduction state of the thyristor in the rectifier bridge is controlled through the thyristor gate drive pulse, so as to adjust the first direct current output current and the second direct current output current.

[0130] As an example, the controller calls the pulse generator to generate the thyristor gate drive pulse. For any rectifier bridge, the pulse generator compares the independent trigger angle of the rectifier bridge with the phase synchronization signal corresponding to the rectifier bridge in real time, and when the instantaneous value of the phase synchronization signal is equal to the set value of the independent trigger angle, the pulse generator immediately generates a high-level thyristor gate drive pulse. After being amplified and isolated by the driving circuit, the thyristor gate drive pulse is sent to the gate of the specified thyristor in the current conduction sequence, so that the thyristor is switched from the off state to the on state.

[0131] As an example, after determining the independent trigger angle corresponding to any rectifier bridge, the rectifier bridge is not directly controlled according to the independent trigger angle, but is first smoothly reduced to the angle value corresponding to the independent trigger angle according to a larger angle value (such as 120 degrees). In this example, the soft start of the rectifier bridge is actually realized, and the inrush current at the start instant is effectively suppressed.

[0132] As an example, when the thyristor gate drive pulse is used to control any one of the rectifier bridges, the first DC output current and the second DC output current are continuously detected. When the first DC output current or the second DC output current exceeds the preset current protection threshold, the controller blocks all the thyristor gate drive pulses and stops controlling the rectifier bridge. In this example, an overcurrent protection scheme for the hydrogen production power supply is provided, which effectively protects the hydrogen production power supply.

[0133] In combination with the above embodiments, the control process of the control method of the hydrogen production power supply provided by the present application is described based on some actual implementation scenarios. In this implementation scenario, the hydrogen production power supply is a twelve-pulse hydrogen production power supply, and the specific architecture of the twelve-pulse hydrogen production power supply is as shown in Figure 7 The control logic of the twelve-pulse hydrogen production power supply is as shown in Figure 8 .

[0134] Referring to Figure 7 , the twelve-pulse hydrogen production power supply includes a phase-shift transformer bridge, a six-pulse three-phase thyristor rectifier bridge A, and a six-pulse three-phase thyristor rectifier bridge B.

[0135] The phase-shift transformer bridge has one primary winding and two secondary windings. One of the two secondary windings is in star connection (i.e., Y / Y connection), and the other is in delta connection (i.e., Y / △ connection). The secondary winding in star connection has U1 phase, V1 phase, and W1 phase, which are connected to the six-pulse three-phase thyristor rectifier bridge A. The secondary winding in delta connection has U2 phase, V2 phase, and W2 phase, which are connected to the six-pulse three-phase thyristor rectifier bridge B.

[0136] The six-pulse three-phase thyristor rectifier bridge A is composed of an upper bridge arm first thyristor SCR1, a third thyristor SCR3, a fifth thyristor SCR5, and a lower bridge arm second thyristor SCR2, a fourth thyristor SCR4, and a sixth thyristor SCR6. Each thyristor is connected in parallel with an RC snubber circuit. The K1, K3, and K5 points on the upper bridge arm of the six-pulse three-phase thyristor rectifier bridge A are connected to the positive DC output bus DC+, and the K2, K4, and K6 points on the lower bridge arm are connected to the negative DC output bus DC-. The U1 phase, V1 phase, and W1 phase of the secondary winding in star connection are connected to the bridge arm midpoints O1, O2, and O3 of the six-pulse three-phase thyristor rectifier bridge A, respectively.

[0137] The six-pulse three-phase thyristor rectifier bridge B is composed of the seventh thyristor SCR7, the ninth thyristor SCR9, the eleventh thyristor SCR11 in the upper bridge arm and the eighth thyristor SCR8, the tenth thyristor SCR10, the twelfth thyristor SCR12 in the lower bridge arm, and each thyristor is connected in parallel with an RC circuit. The points K7, K9, K11 on the upper bridge arm of the six-pulse three-phase thyristor rectifier bridge B are connected with the positive end DC output bus DC+, and the points K8, K10, K12 on the lower bridge arm are connected with the negative end DC output bus DC-. The U2 phase, V2 phase, W2 phase of the secondary winding of the delta connection are connected with the bridge arm midpoints O4, O5, O6 of the six-pulse three-phase thyristor rectifier bridge B respectively.

[0138] The twelve-pulse hydrogen production power supply is provided with the current sensor CT1, the current sensor CT2, the current sensor CT3, the voltage sensor PT1 and the voltage sensor PT2. The current sensor CT1 is connected in series on the upper bridge arm of the six-pulse three-phase thyristor rectifier bridge A, the current sensor CT2 is connected in series on the upper bridge arm of the six-pulse three-phase thyristor rectifier bridge B, the current sensor CT3 is connected in series on the negative end DC output bus DC-, the voltage sensor PT1 is connected in parallel between the U1 phase and the W1 phase, and the voltage sensor PT2 is connected in parallel between the U2 phase and the W2 phase.

[0139] Referring to Figure 8 , Id is the first DC output current, Idf is the feedback current corresponding to the first DC output current, Ir1 is the first DC output current of the six-pulse three-phase thyristor rectifier bridge A, Ir2 is the second DC output current of the six-pulse three-phase thyristor rectifier bridge B, Idref1 is the reference current, Idref2 is the current sharing current, Iderr is the deviation of the first DC output current from the reference current, Irerr1 is the deviation of the second DC output current of the six-pulse three-phase thyristor rectifier bridge A from the current sharing current, Irerr2 is the deviation of the second DC output current of the six-pulse three-phase thyristor rectifier bridge B from the current sharing current, Uuw1 is the AC input voltage of the six-pulse three-phase thyristor rectifier bridge A, PI is the proportional integral link corresponding to the proportional integral controller, HC is the link corresponding to the hysteresis comparator, LF is the link corresponding to the first-order low-pass filter, PLL is the link corresponding to the phase-locked loop, PWM is the link corresponding to the pulse generator, ePWM1 is the driving pulse corresponding to the six-pulse three-phase thyristor rectifier bridge A, ePWM2 is the driving pulse corresponding to the six-pulse three-phase thyristor rectifier bridge B, α is the common trigger angle, β1 is the compensation trigger angle corresponding to the six-pulse three-phase thyristor rectifier bridge A, β2 is the compensation trigger angle corresponding to the six-pulse three-phase thyristor rectifier bridge B, γ1 is the independent trigger angle corresponding to the six-pulse three-phase thyristor rectifier bridge A, γ2 is the independent trigger angle corresponding to the six-pulse three-phase thyristor rectifier bridge B, and U1angle is the initial phase angle corresponding to the six-pulse three-phase thyristor rectifier bridge A.

[0140] Firstly, after Id is acquired by current sensor CT1, Id is processed by first-order low-pass filter LF to obtain Idf corresponding to Id, and then the deviation value between Idf and preset Idref1 is calculated to determine Iderr; subsequently, Idref2 is calculated according to Idref1, and Idref2 = 1 / 2(Idref1); then, for six-pulse three-phase thyristor rectifier bridge A, Id1 is acquired by current sensor CT2, and the deviation Irerr1 between the second DC output current and the current sharing current is calculated, for six-pulse three-phase thyristor rectifier bridge B, Id2 is acquired by current sensor CT3, and the deviation Irerr2 between the second DC output current and the current sharing current is calculated; then, PI is called to process Iderr to obtain common trigger angle α, HC is called to process Irerr1 and Irerr2 respectively to obtain compensation trigger angle β1 corresponding to six-pulse three-phase thyristor rectifier bridge A and compensation trigger angle β2 corresponding to six-pulse three-phase thyristor rectifier bridge B; then, the sum of common trigger angle α and compensation trigger angle β1 is calculated to obtain independent control angle γ1 corresponding to six-pulse three-phase thyristor rectifier bridge A, and the sum of common trigger angle α and compensation trigger angle β2 is calculated to obtain independent control angle γ2 corresponding to six-pulse three-phase thyristor rectifier bridge B; then, Uuw1 is acquired by voltage sensor PT1, and Uuw1 is processed by phase-locked loop to obtain initial phase angle U1angle corresponding to six-pulse three-phase thyristor rectifier bridge A; finally, γ1 and U1angle are input into pulse generator to obtain ePWM1 acting on six-pulse three-phase thyristor rectifier bridge A, and γ2 and U1angle are input into pulse generator to obtain ePWM2 acting on six-pulse three-phase thyristor rectifier bridge B, thereby completing current sharing control of twelve-pulse hydrogen production power supply.

[0141] Reference Figure 9 In the above implementation scenario, the DC output currents Ir1 of six-pulse three-phase thyristor rectifier bridge A and Ir2 of six-pulse three-phase thyristor rectifier bridge B are monitored. In the above implementation scenario, the secondary side voltages of the phase-shifting transformer bridge are set to 225V and 230V respectively to simulate the inconsistency of actual hardware circuit parameters, and the two groups of six-pulse three-phase thyristor rectifier bridges appear uneven current sharing phenomenon in the soft start stage, and when the output current is stable, Ir1 is 7593A and Ir2 is 8787A. After 1.5s of current sharing control starts, Ir1 and Ir2 tend to be balanced, and the current sharing effect is more obvious.

[0142] Based on the same inventive concept, the application further provides a control device of the hydrogen production power supply for implementing the control method of the hydrogen production power supply. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme described in the above method, and therefore the specific limitations in one or more control device embodiments of the hydrogen production power supply provided below can refer to the limitations of the control method of the hydrogen production power supply described above, which will not be repeated here.

[0143] In one embodiment, as shown in Figure 10 a control device of a hydrogen production power supply is provided, comprising: a first acquisition module 1001, a second acquisition module 1002, a determination module 1003, and a control module 1004, wherein:

[0144] The first acquisition module 1001 is configured to acquire a first direct current output current and a plurality of second direct current output currents; wherein the first direct current output current is a current on an output side of the hydrogen production power supply, and the second direct current output current is a current on an output side of a rectifier bridge;

[0145] The second acquisition module 1002 is configured to acquire a reference current and a current sharing current;

[0146] The determination module 1003 is configured to determine a common trigger angle according to a deviation between the first direct current output current and the reference current, and determine a compensation trigger angle corresponding to each rectifier bridge according to a deviation between each second direct current output current and the current sharing current;

[0147] The control module 1004 is configured to control each rectifier bridge according to the compensation trigger angle corresponding to each rectifier bridge and the common trigger angle, so as to adjust each second direct current output current corresponding to each rectifier bridge to the current sharing current.

[0148] In one embodiment, the determination module 1003 comprises:

[0149] A filtering unit is configured to perform first-order low-pass filtering on the first direct current output current to obtain a feedback current corresponding to the first direct current output current;

[0150] A first calculation unit is configured to input a difference between the feedback current and the reference current to a proportional-integral controller, and calculate the common trigger angle through the proportional-integral controller; wherein the common trigger angle is expressed as follows:

[0151] ;

[0152] Wherein, a is the common trigger angle, Id err is the difference between the feedback current and the reference current, Kp is a proportional coefficient of the proportional-integral controller, Ki is an integral coefficient of the proportional-integral controller, and s represents the denominator of the integral operation in the Laplace frequency domain.

[0153] In one embodiment, the determining module 1003 comprises:

[0154] The second calculation unit is configured to input the difference between the second DC output current of the nth rectifier bridge and the current sharing current into the hysteresis comparator respectively, and calculate the compensation trigger angle corresponding to the nth rectifier bridge through the hysteresis comparator; wherein n is an integer greater than or equal to 2.

[0155] In one embodiment, the hysteresis comparator has a hysteresis width H, and the second calculation unit comprises:

[0156] The first determination subunit is configured to determine, by the hysteresis comparator, the compensation trigger angle corresponding to the nth rectifier bridge as 0 when the difference between the second DC output current of the nth rectifier bridge and the current sharing current is within the error band of the hysteresis comparator; wherein the range of the error band is [-H, H];

[0157] The second determination subunit is configured to determine, by the hysteresis comparator, the compensation trigger angle corresponding to the nth rectifier bridge as the first angle when the difference between the second DC output current of the nth rectifier bridge and the current sharing current is less than the minimum value of the error band; wherein the first angle is a negative value.

[0158] The third determination subunit is configured to determine, by the hysteresis comparator, the compensation trigger angle corresponding to the nth rectifier bridge as the second angle when the difference between the second DC output current of the nth rectifier bridge and the current sharing current is greater than the maximum value of the error band; wherein the second angle is a positive value, and the absolute value of the second angle is equal to that of the first angle.

[0159] In one embodiment, the second acquisition module 1002 comprises:

[0160] The calling unit is configured to call the preset reference current.

[0161] The third calculation unit is configured to calculate the quotient of the reference current and the number of rectifier bridges in the hydrogen production power supply, to obtain the current sharing current.

[0162] In one embodiment, the first acquisition module 1002 comprises:

[0163] The first sampling unit is configured to sample the first DC output current through the first current sensor; wherein the first current sensor is arranged on the output side DC bus of the hydrogen production power supply.

[0164] The second sampling unit is configured to sample a plurality of second DC output currents through a plurality of second current sensors respectively; wherein the plurality of second current sensors are arranged on the output side DC bus of each rectifier bridge respectively.

[0165] In one embodiment, the rectifier bridge is a three-phase thyristor rectifier bridge, and the control module 1004 comprises:

[0166] The fourth calculation unit is configured to calculate a sum of the compensation trigger angle and the common trigger angle corresponding to each rectifier bridge respectively to obtain an independent trigger angle corresponding to each rectifier bridge.

[0167] The third sampling unit samples the AC input voltage of each rectifier bridge through a plurality of voltage sensors connected in parallel to any two-phase AC side lines on the input side of each rectifier bridge.

[0168] The fifth calculation unit is configured to input the AC input voltage of the nth rectifier bridge into a phase-locked loop to calculate a phase synchronization signal corresponding to the nth rectifier bridge through the phase-locked loop, wherein n is an integer greater than or equal to 2.

[0169] The determination unit is configured to determine a thyristor gate drive pulse corresponding to the nth rectifier bridge according to the phase synchronization signal corresponding to the nth rectifier bridge and the independent trigger angle, so as to control the nth rectifier bridge through the thyristor gate drive pulse.

[0170] The above-mentioned modules in the control device of the hydrogen production power supply can be realized by software, hardware, or a combination thereof. The above-mentioned modules can be embedded in or independent of the processor in the electronic device in hardware form, or can be stored in the memory in the electronic device in software form, so as to be called and executed by the processor to perform the operations corresponding to the above-mentioned modules.

[0171] In an exemplary embodiment, an electronic device, which can be a server, has an internal structure diagram as shown in Figure 11 The electronic device includes a processor, a memory, an input / output interface (I / O), and a communication interface. The processor, the memory, and the input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. The processor of the electronic device is configured to provide computing and control capabilities. The memory of the electronic device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operating system and the computer program in the non-volatile storage medium to run. The input / output interface of the electronic device is configured to exchange information between the processor and external devices. The communication interface of the electronic device is configured to communicate with external terminals through network connection. The computer program is executed by the processor to implement a control method of a hydrogen production power supply.

[0172] Those skilled in the art can understand that, Figure 11The structure shown in the figure is only a block diagram of part of the structure related to the scheme of the present application, and does not constitute a limitation on the electronic device to which the scheme of the present application is applied. The specific electronic device can include more or fewer components than those shown in the figure, or combine certain components, or have a different component arrangement.

[0173] In one exemplary embodiment, an electronic device is provided, comprising a memory and a processor, the memory storing a computer program, and the processor implementing the following steps when executing the computer program:

[0174] Obtaining a first direct current output current and a plurality of second direct current output currents; wherein the first direct current output current is a current on an output side of a hydrogen production power supply, and the second direct current output current is a current on an output side of a rectifier bridge;

[0175] Obtaining a reference current and an equalization current;

[0176] Determining a common trigger angle according to a deviation between the first direct current output current and the reference current, and determining a compensation trigger angle corresponding to each rectifier bridge according to a deviation between each second direct current output current and the equalization current;

[0177] Controlling each rectifier bridge according to the compensation trigger angle corresponding to each rectifier bridge and the common trigger angle, so as to adjust each second direct current output current corresponding to each rectifier bridge to the equalization current.

[0178] In one embodiment, the processor further implements the following steps when executing the computer program:

[0179] First-order low-pass filtering the first direct current output current to obtain a feedback current corresponding to the first direct current output current;

[0180] Inputting a difference between the feedback current and the reference current to a proportional-integral controller, and calculating the common trigger angle by the proportional-integral controller; wherein the common trigger angle is expressed as follows:

[0181] ;

[0182] Wherein, a is the common trigger angle, Id err is the difference between the feedback current and the reference current, Kp is a proportional coefficient of the proportional-integral controller, Ki is an integral coefficient of the proportional-integral controller, and s represents a denominator of an integral operation in Laplace frequency domain.

[0183] In one embodiment, the processor further implements the following steps when executing the computer program:

[0184] Inputting a difference between the second direct current output current of the nth rectifier bridge and the equalization current to a hysteresis comparator, and calculating the compensation trigger angle corresponding to the nth rectifier bridge by the hysteresis comparator; wherein n is an integer greater than or equal to 2.

[0185] In one embodiment, the processor, when executing the computer program, also implements the following steps:

[0186] When the difference between the second DC output current of the nth rectifier bridge and the current sharing current is within the error band of the hysteresis comparator, the hysteresis comparator determines that the compensation trigger angle corresponding to the nth rectifier bridge is 0; wherein the range of the error band is [-H, H];

[0187] When the difference between the second DC output current of the nth rectifier bridge and the current sharing current is less than the minimum value of the error band, the hysteresis comparator determines that the compensation trigger angle corresponding to the nth rectifier bridge is the first angle; wherein the first angle is a negative value;

[0188] When the difference between the second DC output current of the nth rectifier bridge and the current sharing current is greater than the maximum value of the error band, the hysteresis comparator determines that the compensation trigger angle corresponding to the nth rectifier bridge is the second angle; wherein the second angle is a positive value, and the absolute value of the second angle is equal to that of the first angle.

[0189] In one embodiment, the processor, when executing the computer program, also implements the following steps:

[0190] Calling a preset reference current;

[0191] Calculating the quotient of the reference current and the number of rectifier bridges in the hydrogen production power supply to obtain the current sharing current.

[0192] In one embodiment, the processor, when executing the computer program, also implements the following steps:

[0193] Obtaining the first DC output current by sampling through the first current sensor; wherein the first current sensor is arranged on the output side DC bus of the hydrogen production power supply;

[0194] Obtaining a plurality of second DC output currents by sampling through a plurality of second current sensors respectively; wherein the plurality of second current sensors are arranged on the output side DC bus of each rectifier bridge respectively.

[0195] In one embodiment, the processor, when executing the computer program, also implements the following steps:

[0196] Calculating the sum of the compensation trigger angle corresponding to each rectifier bridge and the common trigger angle respectively to obtain the independent trigger angle corresponding to each rectifier bridge;

[0197] Obtaining the AC input voltage of each rectifier bridge by sampling through a plurality of voltage sensors; wherein the plurality of voltage sensors are connected in parallel to any two-phase AC side lines on the input side of each rectifier bridge;

[0198] The AC input voltage of the nth rectifier bridge is input to a phase-locked loop, and a phase synchronization signal corresponding to the nth rectifier bridge is calculated by the phase-locked loop; wherein n is an integer greater than or equal to 2;

[0199] A thyristor gate drive pulse corresponding to the nth rectifier bridge is determined according to the phase synchronization signal corresponding to the nth rectifier bridge and the independent firing angle, so as to control the nth rectifier bridge through the thyristor gate drive pulse.

[0200] In an embodiment, a computer readable storage medium is provided, and a computer program is stored on the computer readable storage medium, and the computer program is executed by a processor to implement the steps in the above method embodiments.

[0201] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a non-volatile computer readable storage medium, and when the computer program is executed, the processes of the above-mentioned embodiments of the methods can be included. In the embodiments provided in the present application, any reference to memory, database or other medium can include at least one of non-volatile memory and volatile memory. The non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical storage, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. The volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration but not limitation, the RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc. The database involved in the embodiments provided in the present application can include at least one of a relational database and a non-relational database. The non-relational database can include a distributed database based on a block chain, etc., without being limited thereto. The processor involved in the embodiments provided in the present application can be a general processor, a central processing unit, a graphics processing unit, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, an artificial intelligence (AI) processor, etc., without being limited thereto.

[0202] In the description of the present specification, the description referring to the terms "some embodiments", "other embodiments", and the like means that the specific features, structures, materials or characteristics described in connection with the embodiments or examples are contained in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above-mentioned terms does not necessarily mean the same embodiment or example.

[0203] Any combination of the technical features in the above-described embodiments can be made, and for the sake of brevity, not all possible combinations are described, however, it is to be understood that the application encompasses all such possible combinations.

[0204] The above-described embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the scope of the present application. It should be pointed out that, for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A control method of a hydrogen production power supply including at least two parallel-connected rectifier bridges, characterized in that, The control method comprises: obtaining a first direct current output current and a plurality of second direct current output currents; wherein the first direct current output current is a current on an output side of the hydrogen production power supply, and the second direct current output current is a current on an output side of the rectifier bridge; obtaining a reference current and a current sharing current; determining a common trigger angle according to a deviation between the first direct current output current and the reference current, and determining a compensation trigger angle corresponding to each rectifier bridge according to a deviation between each second direct current output current and the current sharing current; controlling each rectifier bridge according to the compensation trigger angle corresponding to each rectifier bridge and the common trigger angle, so as to adjust the second direct current output current corresponding to each rectifier bridge to the current sharing current.

2. The control method according to claim 1, characterized by, The determination of the common trigger angle according to the deviation between the first direct current output current and the reference current comprises: first-order low-pass filtering the first direct current output current to obtain a feedback current corresponding to the first direct current output current; inputting a difference between the feedback current and the reference current to a proportional-integral controller to calculate the common trigger angle by the proportional-integral controller.

3. The control method according to claim 1, characterized by, The determination of the compensation trigger angle corresponding to each rectifier bridge according to the deviation between each second direct current output current and the current sharing current comprises: inputting a difference between the second direct current output current of the nth rectifier bridge and the current sharing current to a hysteresis comparator to calculate the compensation trigger angle corresponding to the nth rectifier bridge by the hysteresis comparator; wherein n is an integer greater than or equal to 2.

4. The control method according to claim 3, characterized by, The hysteresis comparator has a hysteresis width H, and the calculation of the compensation trigger angle corresponding to the nth rectifier bridge by the hysteresis comparator comprises: when the difference between the second direct current output current of the nth rectifier bridge and the current sharing current is within an error band of the hysteresis comparator, the hysteresis comparator determines that the compensation trigger angle corresponding to the nth rectifier bridge is 0; wherein the error band ranges from -H to H; when the difference between the second direct current output current of the nth rectifier bridge and the current sharing current is less than the minimum value of the error band, the hysteresis comparator determines that the compensation trigger angle corresponding to the nth rectifier bridge is a first angle; wherein the first angle is a negative value; when the difference between the second direct current output current of the nth rectifier bridge and the current sharing current is greater than the maximum value of the error band, the hysteresis comparator determines that the compensation trigger angle corresponding to the nth rectifier bridge is a second angle; wherein the second angle is a positive value, and the absolute value of the second angle is equal to that of the first angle.

5. The control method according to claim 1, characterized by, The obtaining of the reference current and the current sharing current comprises: calling a preset reference current; calculating a quotient of the reference current and the number of the rectifier bridges in the hydrogen production power supply to obtain the current sharing current.

6. The control method according to claim 1, characterized by, The obtaining of the first direct current output current and the plurality of second direct current output currents comprises: sampling the first direct current output current by a first current sensor; wherein the first current sensor is arranged on an output side DC bus of the hydrogen production power supply. A plurality of second direct current output currents are sampled by a plurality of second current sensors respectively; wherein the plurality of second current sensors are arranged on the output side DC bus of each rectifier bridge respectively.

7. The control method according to claim 1, characterized by, The rectifier bridge is a three-phase thyristor rectifier bridge, and the control of each rectifier bridge according to the common trigger angle and the compensation trigger angle corresponding to each rectifier bridge comprises: The sum of the common trigger angle and the compensation trigger angle corresponding to each rectifier bridge is calculated respectively to obtain an independent trigger angle corresponding to each rectifier bridge; The AC input voltage of each rectifier bridge is sampled by a plurality of voltage sensors; wherein the plurality of voltage sensors are connected in parallel to any two-phase AC side lines on the input side of each rectifier bridge respectively; The AC input voltage of the nth rectifier bridge is input to a phase-locked loop, and the phase synchronization signal corresponding to the nth rectifier bridge is calculated by the phase-locked loop; wherein n is an integer greater than or equal to 2; According to the phase synchronization signal corresponding to the nth rectifier bridge and the independent trigger angle, the thyristor gate drive pulse corresponding to the nth rectifier bridge is determined to control the nth rectifier bridge through the thyristor gate drive pulse.

8. A control device of a hydrogen production power source, characterized by comprising: The control device comprises: A first acquisition module for acquiring a first direct current output current and a plurality of second direct current output currents; wherein the first direct current output current is the current on the output side of the hydrogen production power supply, and the second direct current output current is the current on the output side of the rectifier bridge; A second acquisition module for acquiring a reference current and an equal current; A determination module for determining a common trigger angle according to the deviation of the first direct current output current and the reference current, and determining a compensation trigger angle corresponding to each rectifier bridge according to the deviation of each second direct current output current and the equal current respectively; A control module for controlling each rectifier bridge according to the compensation trigger angle corresponding to each rectifier bridge and the common trigger angle, so as to adjust the second direct current output current corresponding to each rectifier bridge to the equal current. 9.An electronic device comprising a memory and a processor, the memory storing a computer program, wherein, The processor executes the computer program to realize the steps of the control method of any one of claims 1 to 7.

10. A computer-readable storage medium having stored thereon a computer program, characterized in that, The computer program is executed by the processor to realize the steps of the control method of any one of claims 1 to 7.

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