CN220555720U - Power supply system for electrolytic hydrogen production and electrolytic hydrogen production system - Google Patents
Power supply system for electrolytic hydrogen production and electrolytic hydrogen production system Download PDFInfo
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- CN220555720U CN220555720U CN202321891774.9U CN202321891774U CN220555720U CN 220555720 U CN220555720 U CN 220555720U CN 202321891774 U CN202321891774 U CN 202321891774U CN 220555720 U CN220555720 U CN 220555720U
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- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 133
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 133
- 239000001257 hydrogen Substances 0.000 title claims abstract description 133
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 129
- 238000002955 isolation Methods 0.000 claims description 32
- 238000005868 electrolysis reaction Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 9
- 239000003990 capacitor Substances 0.000 description 8
- 238000005070 sampling Methods 0.000 description 5
- 230000033228 biological regulation Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000003071 parasitic effect Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 238000013016 damping Methods 0.000 description 2
- 230000035772 mutation Effects 0.000 description 2
- 208000033999 Device damage Diseases 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 238000002679 ablation Methods 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/36—Hydrogen production from non-carbon containing sources, e.g. by water electrolysis
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Abstract
The utility model provides a power supply system for electrolytic hydrogen production and an electrolytic hydrogen production system, wherein the power supply system for electrolytic hydrogen production comprises: an alternating current/direct current circuit and a reverse conduction circuit; the positive electrode input end of the alternating current/direct current circuit is electrically connected with the positive electrode of the alternating current power supply, and the negative electrode input end of the alternating current/direct current circuit is electrically connected with the negative electrode of the alternating current power supply; the first end of the reverse conduction circuit is respectively and electrically connected with the positive electrode output end of the alternating current/direct current circuit and the positive electrode input end of the electrolytic hydrogen production tank, and the second end of the reverse conduction circuit is respectively and electrically connected with the negative electrode output end of the alternating current/direct current circuit and the negative electrode input end of the electrolytic hydrogen production tank; the reverse conduction circuit is used for conducting when the alternating current/direct current circuit outputs in reverse polarity, and forms a loop with the alternating current/direct current circuit. Therefore, the electrolytic hydrogen production tank can be short-circuited when the alternating current/direct current circuit outputs in reverse polarity, and the electrolytic hydrogen production tank is prevented from bearing a power supply in reverse polarity.
Description
Technical Field
The utility model relates to the technical field of electrolytic hydrogen production, in particular to a power supply system for electrolytic hydrogen production and an electrolytic hydrogen production system.
Background
In recent years, with the continuous aggravation of global environmental pollution, energy crisis, global warming and other problems, the hydrogen production technology is increasingly widely applied. Generally conventional hydrogen production processes require the use of direct current, and thus power systems for electrolytic hydrogen production typically require the inclusion of an ac/dc circuit through which the ac power is rectified to dc power.
In the actual use process, the alternating current/direct current circuit may have short circuit and other conditions, so that the alternating current/direct current circuit outputs a power supply with reversed polarity to the electrolytic hydrogen production tank, and the electrolytic hydrogen production tank is greatly influenced.
Disclosure of Invention
Aiming at the defects existing in the prior art, the utility model provides a power supply system for electrolytic hydrogen production and an electrolytic hydrogen production system.
In a first aspect, in one embodiment, the present utility model provides a power supply system for electrolytic hydrogen production, the power supply system for electrolytic hydrogen production comprising:
an alternating current/direct current circuit and a reverse conduction circuit;
the positive electrode input end of the alternating current/direct current circuit is electrically connected with the positive electrode of the alternating current power supply, and the negative electrode input end of the alternating current/direct current circuit is electrically connected with the negative electrode of the alternating current power supply;
the first end of the reverse conduction circuit is respectively and electrically connected with the positive electrode output end of the alternating current/direct current circuit and the positive electrode input end of the electrolytic hydrogen production tank, and the second end of the reverse conduction circuit is respectively and electrically connected with the negative electrode output end of the alternating current/direct current circuit and the negative electrode input end of the electrolytic hydrogen production tank;
the reverse conduction circuit is used for conducting when the alternating current/direct current circuit outputs in reverse polarity, and forms a loop with the alternating current/direct current circuit.
In one embodiment, the reverse-conduction circuit includes a diode;
the cathode of the diode is respectively and electrically connected with the positive electrode output end of the alternating current/direct current circuit and the positive electrode input end of the electrolytic hydrogen production tank, and the anode of the diode is respectively and electrically connected with the negative electrode output end of the alternating current/direct current circuit and the negative electrode input end of the electrolytic hydrogen production tank.
In one embodiment, the ac/dc circuit includes:
a pulse width modulation rectifier, a buffer rectifier and a boost module; the pulse width modulation rectifier is connected with the buffer rectifier in parallel;
the pulse width modulation rectifier is used for outputting a first power supply to the electrolytic hydrogen production tank according to the accessed alternating current power supply;
the buffer rectifier is used for outputting a second power supply to the electrolytic hydrogen production tank according to the accessed alternating current power supply; the voltage value of the first power supply is larger than the maximum voltage value which can be output by the second power supply;
the boost module is connected in series with the buffer rectifier and is used for boosting the voltage value of the second power supply, so that the voltage value of the second power supply can be not smaller than the voltage value of the first power supply.
In one embodiment, the boost module includes a boost isolation transformer;
the step-up isolation transformer is connected in series between the ac power source and the snubber rectifier.
In one embodiment, the snubber rectifier comprises a single-phase full-bridge thyristor rectifier and the step-up isolation transformer comprises a single-phase step-up isolation transformer.
In one embodiment, the power supply system for electrolytic hydrogen production further comprises:
a first switch and a second switch;
the first switch is connected with an alternating current power supply, a pulse width modulation rectifier and an electrolytic hydrogen production tank in series;
the second switch is connected with the alternating current power supply, the buffer rectifier, the boosting module and the electrolytic hydrogen production tank in series.
In one embodiment, the power supply system for electrolytic hydrogen production further comprises:
a protection device;
the protection device is connected in parallel with two ends of the second switch;
the protection device is used for reducing the arc of the second switch.
In one embodiment, the second switch is connected in series between the buffer rectifier and the electrolytic hydrogen production tank; the protection device comprises a resistor and a third switch;
the resistor is electrically connected with the third switch, one end of the resistor, which is far away from the third switch, is electrically connected with one end of the second switch, and one end of the third switch, which is far away from the resistor, is electrically connected with the other end of the second switch.
In one embodiment, the step-up isolation transformer further comprises an auxiliary tap;
the auxiliary tap is used for providing working voltage for the power supply system for electrolytic hydrogen production.
In a second aspect, in one embodiment, the present utility model provides an electrolytic hydrogen production system comprising:
an alternating current power supply, an electrolytic hydrogen production tank and a power supply system for electrolytic hydrogen production in any one of the above embodiments.
By the power supply system for electrolytic hydrogen production and the electrolytic hydrogen production system, the reverse conducting circuit is additionally arranged between the alternating current/direct current circuit and the electrolytic hydrogen production tank and is used for conducting when the alternating current/direct current circuit outputs in reverse polarity, and a loop is formed between the reverse conducting circuit and the alternating current/direct current circuit, so that the electrolytic hydrogen production tank can be short-circuited when the alternating current/direct current circuit outputs in reverse polarity, and the electrolytic hydrogen production tank is prevented from bearing the reverse-polarity power supply.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a power supply system for electrolytic hydrogen production in accordance with one embodiment of the present utility model;
FIG. 2 is a schematic diagram illustrating the connection of a diode in a reverse-turn-on circuit according to an embodiment of the present utility model;
FIG. 3 is a reference waveform diagram of the capacitance voltage of a capacitive device without a diode according to one embodiment of the present utility model;
FIG. 4 is a reference waveform diagram of the capacitance voltage of a capacitive device with a diode according to one embodiment of the present utility model;
FIG. 5 is a schematic diagram showing a specific configuration of an AC/DC circuit included in a power supply system for electrolytic hydrogen production according to an embodiment of the present utility model;
FIG. 6 is a schematic diagram of a snubber rectifier as a thyristor rectifier in an embodiment of the utility model;
FIG. 7 is a schematic diagram of a buffer rectifier as a thyristor rectifier according to another embodiment of the present utility model;
FIG. 8 is a schematic diagram of a buffer rectifier as a diode rectifier according to an embodiment of the present utility model;
fig. 9 is a schematic diagram of a buffer rectifier as a diode rectifier according to another embodiment of the present utility model.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to fall within the scope of the utility model.
In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise. In this application, the term "exemplary" is used to mean "serving as an example, instance, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. The following description is presented to enable any person skilled in the art to make and use the utility model. In the following description, details are set forth for purposes of explanation. It will be apparent to one of ordinary skill in the art that the present utility model may be practiced without these specific details. In other instances, well-known structures and processes have not been described in detail so as not to obscure the description of the utility model with unnecessary detail. Thus, the present utility model is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed herein.
In a first aspect, as shown in fig. 1, in one embodiment, the present utility model provides a power supply system for electrolytic hydrogen production, the power supply system for electrolytic hydrogen production comprising:
an alternating current/direct current circuit and a reverse conduction circuit;
the positive electrode input end of the alternating current/direct current circuit is electrically connected with the positive electrode of the alternating current power supply, and the negative electrode input end of the alternating current/direct current circuit is electrically connected with the negative electrode of the alternating current power supply;
the first end of the reverse conduction circuit is respectively and electrically connected with the positive electrode output end of the alternating current/direct current circuit and the positive electrode input end of the electrolytic hydrogen production tank, and the second end of the reverse conduction circuit is respectively and electrically connected with the negative electrode output end of the alternating current/direct current circuit and the negative electrode input end of the electrolytic hydrogen production tank;
the reverse conduction circuit is used for conducting when the alternating current/direct current circuit outputs in reverse polarity, and forms a loop with the alternating current/direct current circuit;
the reverse conducting circuit can comprise a control chip and a triode, wherein the emitter of the triode is respectively and electrically connected with the positive electrode output end of the alternating current/direct current circuit and the positive electrode input end of the electrolytic hydrogen production tank, the collector of the triode is respectively and electrically connected with the negative electrode output end of the alternating current/direct current circuit and the negative electrode input end of the electrolytic hydrogen production tank, and the control chip is electrically connected with the base of the triode, so that when the control chip detects the reverse polarity output of the alternating current/direct current circuit, the control chip sends a high level to the base of the triode to conduct the triode, and then the electrolytic hydrogen production tank is shorted, and the reverse polarity current directly flows back to the alternating current/direct current circuit from the triode; the triode can be replaced by a MOS tube or the like as a supplement.
According to the power supply system for electrolytic hydrogen production, the reverse conducting circuit is additionally arranged between the alternating current/direct current circuit and the electrolytic hydrogen production tank and is used for conducting when the alternating current/direct current circuit is output in the reverse polarity, and a loop is formed between the reverse conducting circuit and the alternating current/direct current circuit, so that the electrolytic hydrogen production tank can be short-circuited when the alternating current/direct current circuit is output in the reverse polarity, and the electrolytic hydrogen production tank is prevented from bearing the reverse polarity power supply.
In one embodiment, the reverse-conduction circuit includes a diode;
the cathode of the diode is respectively and electrically connected with the positive output end of the alternating current/direct current circuit and the positive input end of the electrolytic hydrogen production tank, and the anode of the diode is respectively and electrically connected with the negative output end of the alternating current/direct current circuit and the negative input end of the electrolytic hydrogen production tank;
the diode is anti-parallel connected between the alternating current/direct current circuit and the electrolytic hydrogen production tank, so that the basic function of the reverse conduction circuit can be directly realized, and in the embodiment, the cost can be saved and the circuit structure can be simplified by adopting a diode mode;
the input end of the electrolytic hydrogen production tank, namely the output end of an alternating current/direct current circuit (namely the output end of a hydrogen production power supply, the hydrogen production power supply is formed by the alternating current power supply and the alternating current/direct current circuit), is usually provided with a capacitor device, and when the alternating current power supply is suddenly disconnected, under a high-power hydrogen production scene, the current cannot be immediately turned off due to the distributed inductance effect of a wire between the alternating current/direct current circuit and the electrolytic hydrogen production tank, reverse electromotive force is formed on the distributed inductance, energy is reversely filled into the capacitor device, the reversely filled energy can lead to the capacitor voltage rise of the capacitor device, and the risk of overvoltage damage exists; therefore, the diode in the embodiment can also form a corresponding discharge passage when energy reverse filling occurs, so that overvoltage damage of the capacitor device is avoided;
wherein, as shown in FIG. 2, the AC power source and the AC/DC circuit (i.e. hydrogen production power source) can be equivalently used as a voltage source V s The hydrogen production power source and the electrolytic hydrogen production tank are usually transmitted by adopting a cable, so that the parasitic capacitance and the parasitic inductance of the cable need to be considered, and in fig. 2, the sum of the parasitic capacitance of the cable and the capacitive part of the electrolytic hydrogen production tank is equivalent to the capacitance C d The sum of the parasitic inductance of the cable and the inductive part of the electrolytic hydrogen production tank is equivalent to the inductance L d The resistive part of the electrolytic hydrogen production tank is equivalent to the resistor R load ；
When there is no anti-parallel diode D:
if the failure condition of the hydrogen production power supply is an equivalent short circuit, the alternating current is connected to the electrolytic hydrogen production tank in reverse polarity, and the electrolytic hydrogen production tank is damaged;
if the hydrogen production power supply is suddenly disconnected, namely the hydrogen production power supply is forcedly braked, the inductor L d Resistance R load Capacitor C d Forms an RLC series resonant circuit, and an inductance L is arranged at the turn-off time t0 d The current of (2) is i L0 Capacitance C d Is of the voltage u c0 ；
RLC series resonant circuit natural frequency
The capacitance voltage of the capacitance device is
Wherein,
in the case of under damping, i.e.In this case, the reference waveform of the oscillating discharge is shown in fig. 3, so that it can be seen that in the case of forced braking condition and parameters meeting under damping condition, the capacitor device has a large back electromotive force due to the sudden turn-off of large current, resulting in device damage;
when there is an antiparallel diode D:
if the failure condition of the hydrogen production power supply is an equivalent short circuit, the alternating current reverse polarity returns to the power grid through the diode D, and the electrolytic hydrogen production tank has no voltage;
if the hydrogen production power supply is forced to brake, the inductor L d Resistance R load The RL series circuit is formed by the diode D, then the voltage equation of the capacitor device is:
wherein i is L ＝i L0 e -t/τ ，τ＝L d /R Load In this case, the oscillating discharge reference waveform is shown in fig. 4, and it can be seen that the capacitance voltage of the capacitive device can be turned off rapidly after the diode D is added.
As shown in fig. 5, in one embodiment, the ac/dc circuit includes:
a pulse width modulation rectifier, a buffer rectifier and a boost module; the pulse width modulation rectifier is connected with the buffer rectifier in parallel;
the basic principle of the pulse width modulation rectifier (PWM rectifier) is that the input current of the rectifier is close to sine wave and the current and the voltage are in the same phase by controlling the on-off state of a power switch tube, so that most of current harmonic waves are eliminated and the power factor is close to 1;
the pulse width modulation rectifier is used for outputting a first power supply to the electrolytic hydrogen production tank according to the accessed alternating current power supply;
wherein the alternating current power supply is rectified into a first power supply in a direct current form in a pulse width rectifier;
the buffer rectifier is used for outputting a second power supply to the electrolytic hydrogen production tank according to the accessed alternating current power supply; the voltage value of the first power supply is larger than the maximum voltage value which can be output by the second power supply;
wherein, like the pulse width rectifier, the alternating current power supply is rectified into a second power supply in a direct current form in the buffer rectifier;
it should be noted that the pwm rectifier is connected in parallel with the snubber rectifier, that is, the pwm rectifier and the snubber rectifier output the first power supply and the second power supply, respectively;
the pulse width rectifier can output a stable and reliable first power supply according to an initial power supply input by an alternating current power supply, the voltage value of the first power supply meets the operating voltage value of the electrolytic hydrogen production tank, and the pulse width modulation rectifier does not generate a large amount of reactive power, so that the pulse width modulation rectifier is used as a main rectifier; however, the voltage value of the first power supply output by the pulse width rectifier is fixed and meets the operation voltage value of the electrolytic hydrogen production tank, if the alternating current power supply and the electrolytic hydrogen production tank are directly connected through the pulse width modulation rectifier when the electrolytic hydrogen production tank is started, the first power supply output by the pulse width modulation rectifier can cause the busbar voltage of the electrolytic hydrogen production tank to generate voltage mutation, so that large impact current is generated, internal related devices of the pulse width modulation rectifier are easily damaged, and in addition, the voltage value of the busbar voltage is required to be sequentially increased to the operation voltage value in the starting process of the electrolytic hydrogen production tank; therefore, the buffer rectifier is needed for transition, the voltage value of the bus voltage of the electrolytic hydrogen production tank is sequentially increased before the buffer rectifier is connected to the pulse width modulation rectifier, and the buffer rectifier is connected to the pulse width modulation rectifier when the voltage value of the first power supply output by the pulse width modulation rectifier is increased, so that the voltage mutation of the bus voltage of the electrolytic hydrogen production tank can be avoided, large impact current can not be generated, and the protection effect on related devices is achieved;
the boost module is connected in series with the buffer rectifier and is used for boosting the voltage value of the second power supply so that the voltage value of the second power supply can be not smaller than the voltage value of the first power supply;
in order to avoid the technical problem that the voltage abrupt change cannot be solved well due to the fact that the maximum value of the second power supply output by the buffer rectifier is possibly smaller than the voltage value of the first power supply output by the pulse width modulation rectifier or the difference between the voltage value of the first power supply and the maximum voltage value of the second power supply is allowed to exist in the prior art, in the embodiment, a boosting module is additionally arranged, and the voltage value of the second power supply output by the buffer rectifier is boosted by utilizing the boosting function of the boosting module, so that the voltage value of the first power supply which is not reduced can be matched;
as shown in fig. 5, the boost module may be connected in series between the ac power source and the buffer rectifier, in which case, the boost module is specifically configured to boost an initial power source input by the ac power source, and output the boosted initial power source to the buffer rectifier, so as to boost a voltage value of a second power source output by the buffer rectifier; in other embodiments, the boost module may also be connected in series between the buffer rectifier and the electrolytic hydrogen production tank, where the boost module is directly used to boost the voltage value of the second power supply output by the buffer rectifier.
As shown in fig. 5, in one embodiment, the boost module includes a boost isolation transformer;
the step-up isolation transformer is connected in series between the alternating current power supply and the buffer rectifier;
among them, a Transformer (Transformer) is a device for changing an ac voltage using the principle of electromagnetic induction, and the main components are a primary coil, a secondary coil, and an iron core (magnetic core); the main functions are as follows: voltage transformation, current transformation, impedance transformation, isolation, voltage stabilization (magnetic saturation transformers), etc.; in this embodiment, the isolation function of the transformer is mainly utilized, so that the step-up isolation transformer in this embodiment is connected in series between the ac power source and the buffer rectifier, and further, decoupling of the buffer rectifier and the pwm rectifier at the ac side is ensured, and interference of the pwm rectifier by the buffer rectifier is avoided.
As shown in fig. 5, in one embodiment, the snubber rectifier includes a thyristor rectifier;
the thyristor rectifier (SCR rectifier) adopts phase control rectification, namely, the phase control rectification rectifies alternating-current grid voltage into direct-current voltage by controlling the triggering delay angle of the thyristor; the thyristor belongs to a semi-controlled device, and after the trigger signal is turned on, the thyristor needs to be turned off by back pressure by means of the voltage of a power grid;
the thyristor rectifier has the characteristic of good controllability, so that the thyristor rectifier is used as a buffer rectifier, and the rectifying effect can be improved;
wherein the voltage value of the first power supply in the direct current form output by the pulse width modulation rectifier is usually larger than the voltage peak value of the alternating current power supply, and the voltage value of the second power supply in the direct current form output by the thyristor rectifier is usually not larger than the voltage peak value of the alternating current power supply without considering the boosting module; therefore, the voltage value of the second power supply output by the thyristor rectifier is inevitably smaller than the voltage value of the first power supply output by the pulse width modulation rectifier under the condition that the boosting module is not considered, and the necessity of the boosting module is also reflected;
wherein, from the viewpoint of cost, the thyristor rectifier can be further defined as a single-phase full-bridge thyristor rectifier for reducing cost, and similarly, the step-up isolation transformer is further defined as a single-phase step-up isolation transformer for matching the single-phase full-bridge thyristor rectifier; the primary coil of the single-phase boosting isolation transformer is electrically connected with any phase of an alternating current power supply, and the secondary winding of the single-phase boosting isolation transformer is electrically connected with the single-phase full-bridge thyristor rectifier;
in the combination of the step-up isolation transformer and the thyristor rectifier, the step-up isolation transformer can realize voltage regulation through the on duty ratio, and the thyristor rectifier can also realize voltage regulation through the on duty ratio (namely the conduction angle), namely the step-up isolation transformer and the thyristor rectifier have the voltage regulation function; in this embodiment, the duty ratio of the thyristor rectifier in conduction can be controlled to be unchanged (note that the larger the duty ratio of the thyristor rectifier in conduction is, the more harmonics are generated, and the boosting function of the boosting isolation transformer is utilized to keep the duty ratio of the thyristor rectifier in a smaller one, so as to achieve the purpose of reducing the harmonics; in other embodiments, the adjustment of the voltage value of the second power supply may be implemented in other manners, which will not be described herein.
As shown in fig. 5, in one embodiment, the power supply system for electrolytic hydrogen production further comprises:
a first switch and a second switch;
the first switch is connected with an alternating current power supply, a pulse width modulation rectifier and an electrolytic hydrogen production tank in series;
the second switch is connected with the alternating current power supply, the buffer rectifier, the boosting module and the electrolytic hydrogen production tank in series;
the above embodiments have mentioned that, both the pwm rectifier and the snubber rectifier (such as thyristor rectifier) can be controlled to be turned on or off by an external driving signal; because the pulse width modulation rectifier and the buffer rectifier are connected in parallel and are respectively used for outputting the first power supply and the second power supply to the electrolytic hydrogen production tank, the first power supply and the second power supply are simultaneously output only when the pulse width modulation rectifier and the buffer rectifier are switched, and are respectively output in other time periods, aiming at the situation, an external controller can realize the aim of selecting one of the pulse width modulation rectifier and the buffer rectifier to be connected by changing a driving signal, but the mode may have control errors, thereby influencing the performance and the efficiency of the electrolytic hydrogen production tank; therefore, in this embodiment, for this case, a first switch and a second switch are added, where the first switch is used to control the on-off of the loop of the ac power supply, the pwm rectifier, and the electrolytic hydrogen production tank, and the second switch is used to control the on-off of the loop of the ac power supply, the boost module, the buffer rectifier, and the electrolytic hydrogen production tank, and the purpose of selectively accessing the pwm rectifier and the buffer rectifier is directly implemented by the form of the switch, so that the device has higher reliability compared with the mode of changing the driving signal;
wherein, no matter the first switch or the second switch, a switch element such as a contactor can be adopted; of course, in other embodiments, other types of switching elements may be employed.
As shown in fig. 5, in one embodiment, the power supply system for electrolytic hydrogen production further comprises:
a protection device;
the protection device is connected in parallel with two ends of the second switch;
the protection device is used for reducing the arc of the second switch;
when the second switch is in a closed state, normal running current flows through the second switch, and when the second switch is in an open state, an arc can be generated between contacts at two ends of the second switch due to a voltage difference between the two ends of the second switch and a distance between the contacts at two ends of the second switch, so that abnormal arc current flows through the second switch, the temperature of the arc is extremely high, and a strong ablation effect is generated on the contacts of the second switch, so that the performance of the second switch is affected; thus, in this embodiment, the arc of the second switch is reduced by the parallel protection device; specifically, if the second switch is connected in series between the ac power source and the snubber rectifier, that is, the second switch is on the ac side, the protection device may be a single resistor, which has a proper resistance value, and the stability of the arc generated by the second switch is destroyed by using the resistor, so as to achieve the purpose of reducing the arc and even extinguishing the arc.
As shown in fig. 5, in one embodiment, a second switch is connected in series between the buffer rectifier and the electrolytic hydrogen production tank; the protection device comprises a resistor and a third switch;
the resistor is electrically connected with the third switch, one end of the resistor, which is far away from the third switch, is electrically connected with one end of the second switch, and one end of the third switch, which is far away from the resistor, is electrically connected with the other end of the second switch;
the second switch is connected in series between the buffer rectifier and the electrolytic hydrogen production tank, namely, the second switch is located at the direct current side, which is different from the example of the alternating current side in the embodiment, and a third switch connected in series with a resistor is additionally arranged on the direct current side;
in fig. 5, one end of the resistor, which is far away from the third switch, is respectively and electrically connected with one end of the second switch and the electrolytic hydrogen production tank, and one end of the third switch, which is far away from the resistor, is electrically connected with the other end of the second switch and the buffer rectifier; in other embodiments, the resistor and the third switch may also adopt other positional relationships, which are not described herein.
In one embodiment, the step-up isolation transformer further comprises an auxiliary tap;
the auxiliary tap is used for providing working voltage for a power supply system for electrolytic hydrogen production;
the pulse width modulation rectifier, the step-up transformer, the buffer rectifier, the first switch and/or the second switch are controlled by corresponding controllers, namely the power supply system for electrolytic hydrogen production actually further comprises the controllers, and the controllers need power supply to work normally, so that corresponding driving signals and the like can be sent to the pulse width modulation rectifier, the step-up transformer, the buffer rectifier, the first switch and the second switch; the pulse width modulation rectifier, the step-up transformer, the buffer rectifier, the first switch and/or the second switch also need a power supply to complete the functions of the pulse width modulation rectifier, the step-up transformer, the buffer rectifier and/or the second switch besides responding to the driving signal of the controller; thus, an additional power supply may be provided for the pwm rectifier, the step-up transformer, the snubber rectifier, the first switch, the second switch, the controller, by which the pwm rectifier, the step-up transformer, the snubber rectifier, the first switch, the second switch, and the controller are provided with the operating voltage, but this way increases the cost; in this embodiment, for this case, an auxiliary tap is directly provided in the step-up isolation transformer, and the pulse width modulation rectifier, the step-up transformer, the snubber rectifier, the first switch, the second switch, and the controller are directly supplied with operating voltages by taking power through the auxiliary tap, so that the cost is saved, and the circuit wiring is simplified.
As shown in fig. 6, in one embodiment, the snubber rectifier is a thyristor rectifier (i.e., SCR module in the figure), and the thyristor rectifier is a three-phase thyristor rectifier; the thyristor rectifier is electrically connected with the electrolytic hydrogen production tank through a second switch, and is electrically connected with an alternating current power supply through a boosting isolation transformer; in addition, a current sampling module is connected in series between the second switch and the thyristor rectifier, the current sampling module is used for detecting the current of the second power supply output to the electrolytic hydrogen production tank by the thyristor rectifier, and the subsequent controller can finish corresponding voltage regulation and rectifier switching operations according to the current.
As shown in fig. 7, in one embodiment, the snubber rectifier is a thyristor rectifier (i.e., SCR module in the figure), and the thyristor rectifier is a three-phase thyristor rectifier; the thyristor rectifier is electrically connected with the boosting isolation transformer through the second switch, the boosting isolation transformer is also electrically connected with the alternating current power supply, the buffer rectifier is a thyristor rectifier (namely an SCR module in the figure), and the thyristor rectifier is a three-phase thyristor rectifier; a current sampling module is also connected in series between the electrolytic hydrogen production tank and the thyristor rectifier, and the specific function of the current sampling module can be referred to the above embodiment and will not be described herein.
As shown in fig. 8, in one embodiment, the snubber rectifier is a diode rectifier (i.e., diode module in the figure), and the diode rectifier is a three-phase diode rectifier; the diode rectifier is electrically connected with the electrolytic hydrogen production tank through a second switch; the second switch is connected in parallel with a protection device formed by connecting a third switch and a resistor in series, one end of the third switch, which is far away from the resistor, is respectively and electrically connected with one end of the second switch and the electrolytic hydrogen production tank, and one end of the resistor, which is far away from the third switch, is respectively and electrically connected with the other end of the second switch and the diode rectifier; the diode rectifier is electrically connected with an alternating current power supply through a step-up isolation transformer.
As shown in fig. 9, in one embodiment, the snubber rectifier is a diode rectifier (i.e., diode module in the figure), and the diode rectifier is a single-phase diode rectifier; the diode rectifier is electrically connected with the second switch through the step-up isolation transformer, the diode rectifier is also electrically connected with the electrolytic hydrogen production tank, and the second switch is also electrically connected with the alternating current power supply; the second switch is connected in parallel with a protection device formed by connecting a third switch and a resistor in series, one end of the third switch, which is far away from the resistor, is respectively and electrically connected with one end of the second switch and the step-up isolation transformer, and one end of the resistor, which is far away from the third switch, is respectively and electrically connected with the other end of the second switch and the alternating current power supply.
Fig. 6 to 9 show various types of snubber rectifiers, the positional relationship among the snubber rectifier, the step-up isolation transformer and the second switch, and whether there is a current sampling module and a protection device formed by connecting a third switch and a resistor in series, each of which corresponds to an embodiment, and fig. 6 to 9 show only a part of them, and in other embodiments, any possible embodiment may be adopted, and will not be described herein.
In the foregoing embodiments, the descriptions of the embodiments are focused on, and the portions of one embodiment that are not described in detail in the foregoing embodiments may be referred to in the foregoing detailed description of other embodiments, which are not described herein again.
The power supply system for electrolytic hydrogen production and the electrolytic hydrogen production system provided by the utility model are described in detail, and specific examples are applied to illustrate the principles and the implementation modes of the utility model, and the description of the examples is only used for helping to understand the method and the core idea of the utility model; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in light of the ideas of the present utility model, the present description should not be construed as limiting the present utility model.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
Claims (10)
1. A power supply system for electrolytic hydrogen production, characterized in that the power supply system for electrolytic hydrogen production comprises:
an alternating current/direct current circuit and a reverse conduction circuit;
the positive electrode input end of the alternating current/direct current circuit is electrically connected with the positive electrode of the alternating current power supply, and the negative electrode input end of the alternating current/direct current circuit is electrically connected with the negative electrode of the alternating current power supply;
the first end of the reverse conduction circuit is respectively and electrically connected with the positive electrode output end of the alternating current/direct current circuit and the positive electrode input end of the electrolytic hydrogen production tank, and the second end of the reverse conduction circuit is respectively and electrically connected with the negative electrode output end of the alternating current/direct current circuit and the negative electrode input end of the electrolytic hydrogen production tank;
the reverse conduction circuit is used for conducting when the alternating current/direct current circuit outputs in reverse polarity, and forms a loop with the alternating current/direct current circuit.
2. The electrolytic hydrogen production power supply system according to claim 1, wherein the reverse conducting circuit comprises a diode;
the cathode of the diode is respectively and electrically connected with the positive output end of the alternating current/direct current circuit and the positive input end of the electrolytic hydrogen production tank, and the anode of the diode is respectively and electrically connected with the negative output end of the alternating current/direct current circuit and the negative input end of the electrolytic hydrogen production tank.
3. The electrolytic hydrogen production power supply system according to claim 1, wherein the ac/dc circuit includes:
a pulse width modulation rectifier, a buffer rectifier and a boost module; the pulse width modulation rectifier is connected with the buffer rectifier in parallel;
the pulse width modulation rectifier is used for outputting a first power supply to the electrolytic hydrogen production tank according to the accessed alternating current power supply;
the buffer rectifier is used for outputting a second power supply to the electrolytic hydrogen production tank according to the accessed alternating current power supply; the voltage value of the first power supply is larger than the maximum voltage value which can be output by the second power supply;
the boost module is connected in series with the buffer rectifier and is used for boosting the voltage value of the second power supply so that the voltage value of the second power supply can be not smaller than the voltage value of the first power supply.
4. A power system for producing hydrogen by electrolysis according to claim 3, wherein the step-up module comprises a step-up isolation transformer;
the step-up isolation transformer is connected in series between the ac power source and the snubber rectifier.
5. The electrolytic hydrogen production power system of claim 4 wherein the snubber rectifier comprises a single phase full bridge thyristor rectifier and the step-up isolation transformer comprises a single phase step-up isolation transformer.
6. The electrolytic hydrogen generation power supply system according to any one of claims 3 to 5, further comprising:
a first switch and a second switch;
the first switch is connected with the alternating current power supply, the pulse width modulation rectifier and the electrolytic hydrogen production tank in series;
the second switch is connected with the alternating current power supply, the buffer rectifier, the boosting module and the electrolytic hydrogen production tank in series.
7. The electrolytic hydrogen generation power supply system according to claim 6, further comprising:
a protection device;
the protection device is connected in parallel with two ends of the second switch;
the protection device is used for reducing the arc of the second switch.
8. The electrolytic hydrogen production power supply system according to claim 7, wherein the second switch is connected in series between the buffer rectifier and the electrolytic hydrogen production tank; the protection device comprises a resistor and a third switch;
the resistor is electrically connected with the third switch, one end of the resistor, which is far away from the third switch, is electrically connected with one end of the second switch, and one end of the third switch, which is far away from the resistor, is electrically connected with the other end of the second switch.
9. The electrolytic hydrogen generation power supply system according to any one of claims 4 to 5, wherein the step-up isolation transformer further comprises an auxiliary tap;
the auxiliary tap is used for providing working voltage for the power supply system for electrolytic hydrogen production.
10. An electrolytic hydrogen production system, comprising:
an ac power supply, an electrolytic hydrogen production tank, and an electrolytic hydrogen production power supply system as claimed in any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321891774.9U CN220555720U (en) | 2023-07-18 | 2023-07-18 | Power supply system for electrolytic hydrogen production and electrolytic hydrogen production system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202321891774.9U CN220555720U (en) | 2023-07-18 | 2023-07-18 | Power supply system for electrolytic hydrogen production and electrolytic hydrogen production system |
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| CN220555720U true CN220555720U (en) | 2024-03-05 |
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| CN202321891774.9U Active CN220555720U (en) | 2023-07-18 | 2023-07-18 | Power supply system for electrolytic hydrogen production and electrolytic hydrogen production system |
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| CN (1) | CN220555720U (en) |
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