Power cycle test method and device for direct-current hydrogen production converter
By employing a test platform with N dual active bridge converters in a drag configuration during the testing of DC hydrogen generators, and adjusting the phase shift angle to control the circulating power, the problem of excessive power supply and load power requirements in the testing of large-capacity multi-output DC hydrogen generators was solved, achieving efficient and accurate engineering test guidance.
Patent Information
- Application Number
- CN202511153057.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-18
- Publication Date
- 2025-11-14
AI Technical Summary
Existing test schemes for high-capacity, multi-output DC hydrogen production power supplies have excessively high power requirements for the power supply and load, resulting in a lack of feasibility and making it difficult to effectively guide engineering experiments.
The test platform is constructed using N dual active bridge converters in a paired configuration. Cyclic power control is achieved by adjusting the phase shift angle, requiring only a small-capacity power supply to cover the power cycling loss, ensuring that the converter under test is tested under equivalent full-power operating conditions.
It effectively solves the problem of huge power requirements in existing testing schemes, is simple to control, highly practical, and can efficiently guide the conduct of engineering tests, ensuring the accuracy and feasibility of test results.
Smart Images
Figure CN120948927A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of power testing technology, specifically to a method and apparatus for power cycle testing of a DC hydrogen converter. Background Technology
[0002] Hydrogen energy is the optimal way to achieve large-scale, long-term storage of renewable energy. Hydrogen storage containers are 10 times cheaper than stationary energy storage batteries, and offer flexible midstream transportation and wide downstream applications. The proportion of renewable energy in the future power system will continue to increase, gradually forming a supply and demand pattern of "wind and solar as the mainstay, with diversified support." However, the volatility of renewable energy poses a significant challenge to grid stability, necessitating stable and periodic storage and regulation methods to achieve cross-seasonal, long-term power regulation. Off-grid hydrogen production is an effective solution. Photovoltaic modules output direct current (DC), and electrolyzers also require DC power. Therefore, large-scale renewable energy can be directly used as the power source for electrolyzers after DC aggregation, reducing energy conversion steps and improving efficiency.
[0003] As new energy power generation develops towards larger capacities, the voltage and capacity levels of converters continue to improve, and hydrogen production power sources also need to be able to flexibly connect to various hybrid electrolyzers. As the core equipment for electrolytic hydrogen production, the reliability of the DC hydrogen converter directly affects the operating performance of the entire DC system. During equipment manufacturing or type testing, power cycle tests are typically used to verify the converter's performance under the most severe cyclic operating conditions, verifying its stability under the influence of current, voltage, and temperature, as well as the rationality of the interaction between the power electronic circuits and the main electrical circuit.
[0004] However, existing test schemes for high-capacity, multi-output DC hydrogen production power supplies have the problem of excessive power requirements for the power supply and load, resulting in a lack of feasibility and difficulty in effectively guiding the conduct of engineering tests. Summary of the Invention
[0005] In view of this, the present invention provides a power cycle test method and apparatus for a DC hydrogen generator to solve the problem that existing test schemes for large-capacity multi-output DC hydrogen generators have excessive power requirements for the power supply and load.
[0006] In a first aspect, the present invention provides a power cycle test apparatus for a DC hydrogen production converter, the apparatus comprising: a test power supply and multiple dual active bridge converters, wherein...
[0007] The input port of each of the dual active bridge converters is connected to one output port of the DC-DC hydrogen generator under test, and the output port of each of the dual active bridge converters is connected to the positive and negative terminals of the input port of the DC-DC hydrogen generator under test and the positive and negative terminals of the test power supply.
[0008] The present invention provides a power cycle test device for a DC hydrogen production converter. The test platform is constructed by N dual active bridge converters in a coupled configuration. Cyclic power control is achieved by adjusting the phase shift angle. Under the premise of ensuring the equivalent operating condition of the converter under test at full power, only a small capacity power supply is needed to provide power cycle loss. The control is simple and practical, effectively solving the problem of huge power demand in existing test schemes. It can efficiently guide the conduct of engineering tests.
[0009] In one optional implementation, the dual active bridge converter includes: a transformer, a primary-side full-bridge power electronic circuit, and a secondary-side full-bridge power electronic circuit, wherein,
[0010] One end of the primary side of the transformer is connected to the midpoint of the first bridge arm in the primary full-bridge power electronic circuit, and the other end of the primary side of the transformer is connected to the midpoint of the second bridge arm in the primary full-bridge power electronic circuit. One end of the secondary side of the transformer is connected to the midpoint of the second bridge arm in the secondary full-bridge power electronic circuit, and the other end of the secondary side of the transformer is connected to the midpoint of the first bridge arm in the secondary full-bridge power electronic circuit.
[0011] The two ends of the first bridge arm and the two ends of the second bridge arm in the primary-side full-bridge power electronic circuit are connected to one output port of the DC-DC hydrogen converter under test.
[0012] The two ends of the first bridge arm and the two ends of the second bridge arm in the secondary full-bridge power electronic circuit are connected to the positive and negative terminals of the input port of the DC hydrogen generator under test and the positive and negative terminals of the power supply.
[0013] In one optional embodiment, the dual active bridge converter further includes an inductor, one end of which is connected to one end of the primary side of the transformer, and the other end of which is connected to the midpoint of the first bridge arm in the primary full-bridge power electronic circuit.
[0014] In one alternative implementation, the output ports of the DC-DC hydrogen converter under test, which have the same output voltage level and capacity, are connected in parallel.
[0015] In one optional implementation, when there are no ports with the same output voltage level and capacity in the output ports of the DC-DC hydrogen generator under test, the number of dual active bridge converters is the same as the number of output ports of the DC-DC hydrogen generator under test.
[0016] In one alternative implementation, the test power supply is used to compensate for losses generated during power cycling between the DC-DC hydrogen generator under test and multiple dual active bridge converters.
[0017] In a second aspect, the present invention provides a power cycle test method for a DC-DC hydrogen production converter, the method being applied to the power cycle test apparatus for a DC-DC hydrogen production converter according to the first aspect above or any corresponding embodiment thereof, the method comprising:
[0018] Set the operating mode of the dual active bridge converter corresponding to each output port of the DC hydrogen generator under test;
[0019] Adjust the phase shift angle of each dual active bridge converter to change the power transmitted by the dual active bridge converter, so that the circulating power in the entire circuit reaches the target test power level.
[0020] This invention provides a power cycle test method for a DC hydrogen production converter. The test platform is constructed using N dual active bridge converters in a paired configuration. Cyclic power control is achieved by adjusting the phase shift angle. Under the premise of ensuring the equivalent operating condition of the converter under test at full power, only a small capacity power supply is needed to provide power cycle loss. The control is simple and highly practical, effectively solving the problem of huge power requirements in existing test schemes. It can efficiently guide the conduct of engineering tests.
[0021] In an optional implementation, before setting the operating mode of the dual active bridge converter corresponding to each output port of the DC-DC hydrogen generator under test, the method further includes:
[0022] Start the test power supply and establish a stable DC voltage at the input port of the DC hydrogen generator under test;
[0023] The operating state of the DC hydrogen generator to be tested is set to constant voltage mode;
[0024] Start the DC hydrogen generator under test and establish a stable DC voltage at each output port of the DC hydrogen generator under test.
[0025] In one alternative implementation, the dual active bridge converter operates in two modes: a fixed phase shift mode and a constant power mode.
[0026] In one alternative implementation, the test power supply is used to compensate for losses generated during power cycling between the DC-DC hydrogen generator under test and multiple dual active bridge converters. Attached Figure Description
[0027] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0028] Figure 1 This is a schematic diagram of a DC hydrogen production converter suitable for a large-capacity DC off-grid hydrogen production system according to an embodiment of the present invention;
[0029] Figure 2 This is a schematic diagram of a DC hydrogen converter power cycle test device according to an embodiment of the present invention;
[0030] Figure 3 This is a schematic flowchart of a power cycle test method for a DC hydrogen converter according to an embodiment of the present invention. Detailed Implementation
[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0032] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0033] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can also refer to the internal connection of two components; and they can refer to a wireless connection or a wired connection. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.
[0034] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
[0035] like Figure 1 The diagram shows a DC-DC hydrogen production converter suitable for large-capacity off-grid hydrogen production systems. It enables the mixed connection of various types of electrolyzers, improving the renewable energy consumption rate. However, currently, there are specific requirements for… Figure 1The existing test schemes for this type of high-capacity, multi-output DC hydrogen production power supply have the problem of extremely high power requirements and load power, which makes them impractical and difficult to effectively guide engineering experiments.
[0036] Based on the above, this application proposes a power cycling test device for a DC hydrogen generator. By adjusting the phase shift angle of the dual active bridge converter to control the cycling power, it can simulate the voltage and current stress under actual operating conditions of a large-capacity DC hydrogen generator, and test the output capacity of each port and the system performance. The method is simple and highly practical.
[0037] like Figure 2 As shown, the DC-DC hydrogen converter power cycle test device includes a test power supply and multiple dual active bridge converters. The input port of each dual active bridge converter is connected to one output port of the DC-DC hydrogen converter under test, and the output port of each dual active bridge converter is connected to the positive and negative terminals of the input port of the DC-DC hydrogen converter under test and the positive and negative terminals of the test power supply.
[0038] Specifically, for the full-power operation test of a large-capacity DC hydrogen generator with N outputs, a configuration of N dual active bridge converters can be used. For example... Figure 2 As shown, the N output ports of a DC-DC hydrogen generator under test are connected to the input ports of N dual active bridge converters under test, respectively. The output ports of the dual active bridge converters under test are connected to the positive and negative terminals of the input ports of the DC-DC hydrogen generator under test and the positive and negative terminals of the test power supply.
[0039] The cyclic power is controlled by adjusting the phase shift angle between the primary and secondary full-bridge power electronic circuits in each of the dual active bridge converters under test. In this case, the test power supply only needs to cover the losses generated during the power cycling process between the tested DC-DC hydrogen converter and the multiple dual active bridge converters; therefore, the required test power supply capacity is very small.
[0040] The present invention provides a power cycle test device for a DC hydrogen production converter. The test platform is constructed by N dual active bridge converters in a coupled configuration. Cyclic power control is achieved by adjusting the phase shift angle. Under the premise of ensuring the equivalent operating condition of the converter under test at full power, only a small capacity power supply is needed to provide power cycle loss. The control is simple and practical, effectively solving the problem of huge power demand in existing test schemes. It can efficiently guide the conduct of engineering tests.
[0041] In one alternative implementation, such as Figure 2 As shown, the dual active bridge converter includes: a transformer, a primary-side full-bridge power electronic circuit, and a secondary-side full-bridge power electronic circuit.
[0042] Specifically, with Figure 2Taking the dual active bridge converter 1 as an example, one end of the primary side of transformer T1 is connected to the midpoint A1 of the first bridge arm in the primary full-bridge power electronic circuit, and the other end of the primary side of transformer T1 is connected to the midpoint A2 of the second bridge arm in the primary full-bridge power electronic circuit. One end of the secondary side of transformer T1 is connected to the midpoint A4 of the second bridge arm in the secondary full-bridge power electronic circuit, and the other end of the secondary side of transformer T1 is connected to the midpoint A3 of the first bridge arm in the secondary full-bridge power electronic circuit. The two ends of the first bridge arm and the two ends of the second bridge arm in the primary full-bridge power electronic circuit are connected to one output port of the DC-DC hydrogen generator under test. The two ends of the first bridge arm and the two ends of the second bridge arm in the secondary full-bridge power electronic circuit are connected to the positive and negative terminals of the input port of the DC-DC hydrogen generator under test and the positive and negative terminals of the power supply.
[0043] Furthermore, the primary side of transformer T1 is connected to the midpoints A1 and A2 of the first and second arms of the primary full-bridge circuit, respectively. Power is received from the primary full-bridge circuit through these two midpoints and coupled to the secondary side via electromagnetic induction. The secondary side of transformer T1 is connected to the midpoints A4 and A3 of the second and first arms of the secondary full-bridge circuit, respectively, transferring the power coupled from the primary side to the secondary full-bridge circuit, thus realizing power transfer from the primary to the secondary side. This connection method ensures efficient power circulation between the device under test and the accompanying dual active bridge converter. Combined with phase shift adjustment, the circulating power can be precisely controlled, allowing the converter under test to withstand voltage and current stresses consistent with actual operation, ultimately achieving effective performance testing.
[0044] In one alternative implementation, such as Figure 2 As shown, the dual active bridge converter also includes an inductor.
[0045] Specifically, with Figure 2 Taking the dual active bridge converter 1 as an example, one end of the inductor L1 is connected to one end of the primary side of the transformer T1, and the other end of the inductor L1 is connected to the midpoint A1 of the first bridge arm in the primary full-bridge power electronic circuit.
[0046] Furthermore, during the process of adjusting the cyclic power by shifting the phase angle, the inductor can smooth the dynamic process of power transmission, making the power change more continuous. This ensures that the voltage and current stresses borne by the tested DC-DC hydrogen converter are closer to the actual operating conditions, thereby improving the accuracy and effectiveness of the test.
[0047] In one alternative implementation, the output ports of the DC-DC hydrogen converter under test, which have the same output voltage level and capacity, are connected in parallel.
[0048] Specifically, when the output ports of the DC-DC hydrogen generator under test do not have ports with the same output voltage level and capacity, the number of dual active bridge converters should be the same as the number of output ports of the DC-DC hydrogen generator under test. When multiple output ports of a high-capacity DC-DC hydrogen generator have ports with the same voltage and capacity, these ports can be connected in parallel, thereby reducing the number of dual active bridge converters required for testing and simplifying the power cycle test platform. Figure 2 As shown, when the output voltage level and capacity of output port 1 and output port 2 are the same, the two ports can be connected in parallel, thus eliminating the need for one dual active bridge converter.
[0049] This invention provides a power cycle test method for a DC-DC hydrogen converter, applicable to applications such as... Figure 2 The power cycle test apparatus for the DC hydrogen converter shown is as follows: Figure 3 As shown, the power cycle test method for a DC hydrogen converter includes the following steps:
[0050] Step S111: Set the operating mode of the dual active bridge converter corresponding to each output port of the DC hydrogen generator under test.
[0051] Specifically, after connecting the DC-DC hydrogen production converter under test to N auxiliary dual active bridge converters, the operating modes of the N auxiliary dual active bridge converters are set. The operating modes of the auxiliary dual active bridge converters include: fixed phase shift mode and constant power mode. Both modes are prepared for subsequent precise control of power cycling, ensuring that the auxiliary dual active bridge converters can cooperate with the DC-DC hydrogen production converter under test to adjust the cycle power.
[0052] Step S112: Adjust the phase shift angle of each dual active bridge converter to change the power transmitted by the dual active bridge converter, so that the circulating power in the entire circuit reaches the target test power level.
[0053] Specifically, the control system sends unlock signals to N dual active bridge converters under test. After the dual active bridge converters under test are started, their input ports begin to receive power and their output ports begin to transmit power. At this time, the power circulation loop of the DC-DC converter under test → dual active bridge converters under test → DC-DC converter under test is initially formed.
[0054] Furthermore, by adjusting the phase shift angle of each dual active bridge converter, the transmitted power is changed, so that the circulating power in the entire loop reaches the full power or target power level of the DC-DC hydrogen generator under test. At this time, the DC-DC hydrogen generator under test will be subjected to the same voltage and current stress as in actual operation. Test personnel can verify whether its system performance meets the standards by detecting parameters such as voltage stability, current response speed, and power output capability at each output port. During this process, the test power supply only needs to cover the losses generated during the power cycling process between the DC-DC hydrogen generator under test and the multiple dual active bridge converters; therefore, the required test power supply capacity is very small.
[0055] This invention provides a power cycle test method for a DC hydrogen production converter. The test platform is constructed using N dual active bridge converters in a paired configuration. Cyclic power control is achieved by adjusting the phase shift angle. Under the premise of ensuring the equivalent operating condition of the converter under test at full power, only a small capacity power supply is needed to provide power cycle loss. The control is simple and highly practical, effectively solving the problem of huge power requirements in existing test schemes. It can efficiently guide the conduct of engineering tests.
[0056] In an optional implementation, prior to step S111, the DC-DC hydrogen converter power cycle test method further includes the following steps:
[0057] Step S101: Start the test power supply and establish a stable DC voltage at the input port of the DC hydrogen generator under test.
[0058] Specifically, when performing the power cycle test method for the DC hydrogen generator, the test power supply that powers the entire test system is first started to establish a stable DC voltage at the high-voltage side input port of the high-capacity DC hydrogen generator under test, providing initial power support for the operation of all subsequent equipment.
[0059] Step S102: Set the operating state of the DC hydrogen converter under test to constant voltage mode.
[0060] Specifically, the DC-DC hydrogen generator under test needs to be set to a constant voltage mode. In this mode, the DC-DC hydrogen generator under test will stably output a preset voltage value. Since the DC-DC hydrogen generator under test needs to provide a stable DC voltage to the electrolyzer during actual operation, this characteristic is simulated in the test to ensure that its output voltage remains stable, thus preparing for subsequent connection with the test equipment.
[0061] Step S103: Start the DC hydrogen generator under test and establish a stable DC voltage at each output port of the DC hydrogen generator under test.
[0062] Specifically, the control system sends an unlock signal (an instruction allowing it to start working) to the DC-DC hydrogen generator under test. After the DC-DC hydrogen generator under test starts, stable DC voltages will be established at its N low-voltage side output ports. At this time, the DC-DC hydrogen generator under test has entered the working state, and its output is ready to be connected to the test equipment.
[0063] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.
Claims
1. A power cycle test device for a DC hydrogen converter, characterized in that, The device includes: a test power supply and multiple dual active bridge converters, wherein, The input port of each of the dual active bridge converters is connected to one output port of the DC-DC hydrogen generator under test, and the output port of each of the dual active bridge converters is connected to the positive and negative terminals of the input port of the DC-DC hydrogen generator under test and the positive and negative terminals of the test power supply.
2. The DC-DC hydrogen converter power cycle test apparatus according to claim 1, characterized in that, The dual active bridge converter includes: a transformer, a primary-side full-bridge power electronic circuit, and a secondary-side full-bridge power electronic circuit, wherein... One end of the primary side of the transformer is connected to the midpoint of the first bridge arm in the primary full-bridge power electronic circuit, and the other end of the primary side of the transformer is connected to the midpoint of the second bridge arm in the primary full-bridge power electronic circuit. One end of the secondary side of the transformer is connected to the midpoint of the second bridge arm in the secondary full-bridge power electronic circuit, and the other end of the secondary side of the transformer is connected to the midpoint of the first bridge arm in the secondary full-bridge power electronic circuit. The two ends of the first bridge arm and the two ends of the second bridge arm in the primary-side full-bridge power electronic circuit are connected to one output port of the DC-DC hydrogen converter under test. The two ends of the first bridge arm and the two ends of the second bridge arm in the secondary full-bridge power electronic circuit are connected to the positive and negative terminals of the input port of the DC hydrogen generator under test and the positive and negative terminals of the power supply.
3. The DC-DC hydrogen converter power cycle test apparatus according to claim 2, characterized in that, The dual active bridge converter further includes an inductor, one end of which is connected to one end of the primary side of the transformer, and the other end of which is connected to the midpoint of the first bridge arm in the primary full-bridge power electronic circuit.
4. The DC-DC hydrogen converter power cycle test apparatus according to claim 1, characterized in that, The output ports of the DC hydrogen converter under test, which have the same output voltage level and capacity, are connected in parallel.
5. The DC-DC hydrogen converter power cycle test apparatus according to claim 4, characterized in that, When there are no ports with the same output voltage level and capacity in the output ports of the DC-DC hydrogen production converter under test, the number of dual active bridge converters is the same as the number of output ports of the DC-DC hydrogen production converter under test.
6. The DC hydrogen converter power cycle test apparatus according to claim 1, characterized in that, The test power supply is used to compensate for the power losses generated during the power cycling process between the tested DC hydrogen generator and multiple dual active bridge converters.
7. A power cycle test method for a DC hydrogen converter, characterized in that, The method is applied to the DC-DC hydrogen converter power cycle test apparatus according to any one of claims 1-6, and the method includes: Set the operating mode of the dual active bridge converter corresponding to each output port of the DC hydrogen generator under test; Adjust the phase shift angle of each dual active bridge converter to change the power transmitted by the dual active bridge converter, so that the circulating power in the entire circuit reaches the target test power level.
8. The power cycle test method for a DC hydrogen converter according to claim 7, characterized in that, Before setting the operating mode of the dual active bridge converter corresponding to each output port of the DC-DC hydrogen generator under test, the method further includes: Start the test power supply and establish a stable DC voltage at the input port of the DC hydrogen generator under test; The operating state of the DC hydrogen generator to be tested is set to constant voltage mode; Start the DC hydrogen generator under test and establish a stable DC voltage at each output port of the DC hydrogen generator under test.
9. The power cycle test method for a DC hydrogen converter according to claim 7, characterized in that, The operating modes of the dual active bridge converter include: fixed phase shift mode and constant power mode.
10. The power cycle test method for a DC hydrogen converter according to claim 8, characterized in that, The test power supply is used to compensate for the power losses generated during the power cycling process between the tested DC hydrogen generator and multiple dual active bridge converters.