CN112953268A - Hydrogen production converter topological structure suitable for being connected into single-phase alternating current system and control method - Google Patents
Hydrogen production converter topological structure suitable for being connected into single-phase alternating current system and control method Download PDFInfo
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- CN112953268A CN112953268A CN202110130173.5A CN202110130173A CN112953268A CN 112953268 A CN112953268 A CN 112953268A CN 202110130173 A CN202110130173 A CN 202110130173A CN 112953268 A CN112953268 A CN 112953268A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/219—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/3353—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having at least two simultaneously operating switches on the input side, e.g. "double forward" or "double (switched) flyback" converter
Abstract
The invention discloses a hydrogen production converter topological structure suitable for being connected into a single-phase alternating current system and a control method, wherein the hydrogen production converter topological structure comprises an alternating current power supply, a single-phase alternating current power supply, a pre-stage rectifier module, a grounding point and a power supply, wherein the alternating current power supply is a single-phase alternating current voltage source which is connected with an alternating current reactor in series and then connected with the pre-stage rectifier module in parallel; the pre-stage rectification module is provided with a plurality of groups of direct current output ends, and all the direct current output ends of the pre-stage rectification module are connected with the direct current input end of the second-stage conversion module; the second-stage conversion module is provided with a plurality of groups of direct current input ends and direct current output ends, all the direct current input ends are connected with the direct current output ends corresponding to the front-stage rectification module, all the direct current output ends of the second-stage conversion module are mutually connected in parallel, and the anode and the cathode of the direct current output ends after being connected in parallel are respectively connected with the anode and the cathode of the electrolytic cell; the control system module calculates and outputs a control signal; the invention further improves the current output capability, realizes the conversion from high-voltage alternating current to low-voltage direct current, and is easy to realize higher voltage transformation ratio.
Description
Technical Field
The invention relates to the field of hydrogen production by electrolyzing water, in particular to a hydrogen production converter topological structure suitable for being connected into a single-phase alternating current system and a control method.
Background
In recent years, new energy technology is rapidly developed, the proportion of the new energy in a backbone network and a power distribution network is continuously improved, the consumption and storage of the new energy become one of bottlenecks in the development of large-scale new energy, and phenomena such as wind abandonment of a large-scale wind power plant are increasingly serious and need to be solved urgently. The hydrogen production by electrolyzing water provides a new solution for energy consumption. The electrolyzed water can be fresh water or processed seawater, the raw material cost is low, and the hydrogen can be compressed and stored for industrial production and manufacturing of fuel cells and the like. In the device for producing hydrogen by using new energy, a converter is one of key devices. The hydrogen production equipment based on the offshore wind power plant is used for building demonstration projects in China, such as a 10MW hydrogen production project of a Hebei source, is connected with a 200MW wind power plant, realizes hydrogen production by electrolyzing water by utilizing residual wind energy, effectively relieves the problems of wind abandonment and the like, and can be used as one of feasible schemes for large-scale energy storage in a modern power system.
The hydrogen production converter can be connected to an alternating current bus or a direct current bus, and converts alternating current and direct current with relatively high voltage grade into low-voltage direct current electric energy to supply power to the hydrogen production electrolytic cell. In the existing literature, a DC/DC converter is generally used for a wind energy hydrogen production system to be connected to a direct current bus of a wind power converter or an alternating current bus of a grid-connected point. The rated working voltage of the hydrogen production device is only a few volts, the hydrogen yield is in direct proportion to the current, and in order to match the voltage grade of the wind turbine generator, the adopted conventional DC/DC or AC/DC converter is usually high in voltage, a converter with high transformation ratio is required to be adopted, and the current output capacity is limited. If a unidirectional alternating current power supply is adopted for supplying power, the system voltage level can be reduced, and the system efficiency is improved, at present, research results of the hydrogen production converter in the unidirectional alternating current system are relatively few, and research on the application occasions of the hydrogen production converter based on the unidirectional alternating current can expand the hydrogen production system, so that the provided hydrogen production converter topological structure suitable for being connected into the single-phase alternating current system and the control method thereof have important research significance and application prospect.
For the wind power hydrogen production device connected with the direct current bus of the converter of the wind turbine generator, a Buck converter can be adopted to realize voltage reduction DC/DC conversion, and the voltage of the electrolytic cell is adjusted by adjusting the duty ratio of the DC/DC converter, so that the hydrogen yield is controlled. For the hydrogen production device connected with the grid-connected point three-phase alternating current bus, AC/DC conversion is firstly carried out, and the output direct current voltage is converted into low-voltage direct current through DC/DC conversion to supply power to an electrolytic cell. The AC/DC converter controls the DC voltage, and the DC/DC converter controls the output current. The control method can realize the control of the DC/DC converter, and the output current controller of the hydrogen production converter is designed based on a PI regulator, but the method cannot be directly connected with an alternating current power supply, needs to design a unidirectional AC/DC converter to supply power for the hydrogen production device, and provides a suitable electrolytic bath working voltage grade. Considering that a plurality of groups of electrolytic cells can be connected in series in actual engineering to improve rated working voltage, but the voltage is still relatively low after the electrolytic cells are connected in series, therefore, converter topology needs to be designed to realize AC/DC conversion and isolation of low-voltage side and high-voltage side; in the aspect of control strategy, the power balance of the hydrogen production device and the grid-side converter can be coordinated, and the dynamic performance of the system is improved.
Disclosure of Invention
This section is for the purpose of summarizing some aspects of embodiments of the invention and to briefly introduce some preferred embodiments, and in this section as well as in the abstract and the title of the invention of this application some simplifications or omissions may be made to avoid obscuring the purpose of this section, the abstract and the title of the invention, and such simplifications or omissions are not intended to limit the scope of the invention.
The present invention has been made keeping in mind the above problems occurring in the prior art and/or the problems occurring in the prior art.
Therefore, the technical problem to be solved by the present invention is that a DC/DC converter is usually connected to a DC bus of a wind power converter or an ac bus of a grid-connected point for a wind energy hydrogen production system in the current document. The rated working voltage of the hydrogen production device is only a few volts, the hydrogen yield is in direct proportion to the current, and in order to match the voltage grade of the wind turbine generator, the adopted conventional DC/DC or AC/DC converter is usually high in voltage, a converter with high transformation ratio is required to be adopted, and the current output capacity is limited.
In order to solve the technical problems, the invention provides the following technical scheme: the hydrogen production converter topological structure suitable for being connected into a single-phase alternating current system comprises an alternating current power supply, wherein the alternating current power supply is a single-phase alternating current voltage source, the alternating current power supply is connected with an alternating current reactor in series and then connected with a preceding stage rectification module in parallel, and a low-voltage end after the alternating current power supply is connected with a grounding point;
the pre-stage rectification module is provided with a plurality of groups of direct current output ends, and all the direct current output ends of the pre-stage rectification module are connected with the direct current input end of the second-stage conversion module;
the second-stage conversion module is provided with a plurality of groups of direct current input ends and direct current output ends, all the direct current input ends of the second-stage conversion module are connected with the direct current output ends corresponding to the front-stage rectification module, all the direct current output ends of the second-stage conversion module are mutually connected in parallel, and the anode and the cathode of the direct current output ends after being connected in parallel are respectively connected with the anode and the cathode of the electrolytic cell;
and the control system module is used for acquiring system voltage and current information, calculating and outputting a control signal, and sending the control signal to the preceding stage rectification module and the second stage conversion module.
As a preferred embodiment of the hydrogen production converter topology suitable for accessing a single-phase ac system according to the present invention, wherein: the alternating current power supply is composed of a single-phase alternating current voltage source, an output breaker, a charging resistor and a bypass contactor, one end of the single-phase alternating current voltage source is grounded, the other end of the single-phase alternating current voltage source is connected with the output breaker and the charging resistor in series, and the charging resistor is connected with one end of an alternating current reactor after being connected with the bypass contactor in parallel.
As a preferred embodiment of the hydrogen production converter topology suitable for accessing a single-phase ac system according to the present invention, wherein: the preceding stage rectification module is formed by connecting a plurality of full-bridge modules in series, one end of the preceding stage rectification module is connected with the alternating current reactor after the preceding stage rectification module is connected in series, and the other end of the preceding stage rectification module is connected with the alternating current power supply and the grounding point.
As a preferred embodiment of the hydrogen production converter topology suitable for accessing a single-phase ac system according to the present invention, wherein: the full-bridge module is parallelly connected again by two liang of series connection of first switching device, second switching device, third switching device, fourth switching device, and the tie point of establishing ties is the alternating current output of full-bridge module, and third switching device, fourth switching device are parallelly connected back and are parallelly connected with module electric capacity, discharge resistance and bypass switch again, and the positive negative pole of module electric capacity is the direct current output of full-bridge module.
As a preferred embodiment of the hydrogen production converter topology suitable for accessing a single-phase ac system according to the present invention, wherein: the second-stage conversion module comprises a plurality of DC/DC modules, the direct current input end of each DC/DC module is connected with the output end of one full-bridge module in the preceding-stage rectification module, the anode and the cathode of the direct current output end of each DC/DC module are respectively connected with the anode and the cathode of the electrolytic cell, a fifth switching element, a sixth switching element, a seventh switching element and an eighth switching element in the DC/DC modules are respectively connected with a fifth diode, a sixth diode, a seventh diode and an eighth diode in an anti-parallel mode and are mutually connected in a full-bridge structure to form an H-bridge module, the direct current side of the H-bridge module is connected with the direct current input end of the DC/DC module, the alternating current side of the H-bridge module is connected with the primary winding of the high-frequency transformer in parallel, the two ends of the secondary winding of the high-frequency transformer are respectively connected with the cathodes of a ninth diode and a twelfth polar tube, and the anodes of the ninth, and the positive electrode of the output capacitor is connected with one ends of the first direct current reactor and the second direct current reactor, and the other ends of the first direct current reactor and the second direct current reactor are respectively connected with the cathodes of the ninth diode and the twelfth diode.
As a preferred embodiment of the hydrogen production converter topology suitable for accessing a single-phase ac system according to the present invention, wherein: the control system module receives all full-bridge module and DC/DC module voltages, single-phase alternating current power grid voltage and current, electrolysis bath voltage and current information, outputs all full-bridge module and DC/DC module trigger signals after calculation, and adopts control signal calculation including two parts, a preceding stage rectification module control structure and a second stage conversion module control structure.
The invention provides the following technical scheme: a method for controlling a hydrogen production converter topology suitable for access to a single phase ac system, wherein: the preceding stage rectification module control structure comprises the following calculation processes,
calculating the phase of the power grid; calculating the phase of the alternating current; calculating a current amplitude signal; calculating an alternating current given signal; calculating the alternating current control quantity; calculating the amplitude of the steady-state modulation signal; calculating the phase of the steady-state modulation signal; calculating a steady-state voltage modulation signal; and outputting the preceding stage rectification trigger pulse.
As a preferable scheme of the control method of the hydrogen production converter topology structure suitable for being connected into the single-phase alternating current system, the method comprises the following steps: the second level transformation module control structure comprises the following calculation process,
calculating the given current of the electrolytic cell; the DC/DC module gives current calculation; calculating a phase shifting angle; and (6) triggering signal output.
As a preferable scheme of the control method of the hydrogen production converter topology structure suitable for being connected into the single-phase alternating current system, the method comprises the following steps: the power grid phase calculation is to connect the alternating voltage sampling value with a phase-locked loop through a delay link and calculate an alternating voltage source phase signal; and the alternating current phase calculation is to make a difference between the given capacitor voltage average value and all full-bridge module capacitor voltage average values, the difference value is connected with the input end of a first proportional-integral regulator, the output of the first proportional-integral regulator is the voltage phase adjustment quantity of a preceding stage rectifier module, the voltage phase adjustment quantity is multiplied by a proportionality coefficient of 0.5 to obtain a current phase adjustment quantity, and then the current phase adjustment quantity and the alternating current voltage source phase are added to obtain an alternating current phase signal.
As a preferable scheme of the control method of the hydrogen production converter topology structure suitable for being connected into the single-phase alternating current system, the method comprises the following steps: the calculation of the given current of the electrolytic cell comprises the step of calculating the difference between the given voltage of the electrolytic cell and the feedback voltage value of the electrolytic cell by a third PI regulator, and the output signal is the given current value of the electrolytic cell; the calculation of the given current of the DC/DC module comprises the steps of dividing the given current of the electrolytic cell by the number n of the DC/DC modules to obtain a steady-state value of the output current of a single DC/DC module, then making a difference between the input voltage value of the nth DC/DC module and the given signal of the average value of the input voltage value of the nth DC/DC module, obtaining the adjustment quantity of the output current of the nth DC/DC module through a proportion regulator, and adding the steady-state value of the output current of the DC/DC module and the adjustment quantity of the output current of the nth DC/DC module to obtain the given signal of the current of the nth DC/DC module.
The invention has the beneficial effects that:
1. the hydrogen production device can be connected with a single-phase alternating current power grid, an alternating current input end adopts a module cascade structure of a single bridge arm, the hydrogen production device is suitable for access of various alternating current voltage grades, and an output end adopts a single sub-module capacitor as a direct current power supply and improves current output capacity through double-current DC/DC conversion. Due to the adoption of a modular structure, a plurality of DC/DC converters can be connected in parallel to supply power to the electrolytic cell, the current output capacity is further improved, the conversion from high-voltage alternating current to low-voltage direct current is realized, and the higher voltage transformation ratio is easy to realize.
2. A single-bridge-arm voltage control method is provided for a preceding stage rectifier module, and the active power output by an alternating current power supply is controlled by changing the output voltage phase of the preceding stage rectifier module, so that the power balance of an alternating current side and a direct current side is realized. And the fast tracking of the current inner loop is realized based on the proportional-resonant regulator. Meanwhile, direct current power output by the electrolytic cell is introduced into a control loop of the preceding stage rectification module, and capacitance voltage of the preceding stage rectification module is introduced into an output current control loop of the second stage conversion module, so that a coordination control function between the preceding stage rectification and the second stage conversion is realized, and the dynamic response speed of the system can be improved.
3. According to the hydrogen production device and the control method, the topological structure and the control module are both of a two-stage structure, the designed second-stage conversion module can be easily transformed into a cascade structure, the direct current input end of the DC/DC conversion module is directly transformed into a serial connection in sequence from head to tail, and the access of a high-voltage direct current power grid can be realized by disconnecting the preceding-stage rectification module, so that the hydrogen production device can be applied to a traditional alternating current power distribution network and a novel direct current power distribution network to produce hydrogen as one of energy storage means.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise. Wherein:
FIG. 1 is a schematic diagram of a hydrogen converter topology suitable for use in a single phase AC system according to one embodiment of the present invention;
fig. 2 is a schematic structural diagram of a full bridge module in a preceding stage rectification module in a hydrogen production converter topology suitable for accessing a single-phase ac system according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a voltage configuration of a DC/DC module in a second stage converter module in a hydrogen production converter topology suitable for use in connection with a single phase AC system according to one embodiment of the present invention;
fig. 4 is a schematic diagram illustrating a control method of a preceding-stage rectification module in a hydrogen production converter topology suitable for accessing a single-phase ac system according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a method for controlling a DC/DC module in a hydrogen production converter topology suitable for accessing a single-phase ac system according to an embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
Next, the present invention will be described in detail with reference to the drawings, wherein the cross-sectional views illustrating the structure of the device are not enlarged partially according to the general scale for convenience of illustration when describing the embodiments of the present invention, and the drawings are only examples, which should not limit the scope of the present invention. In addition, the three-dimensional dimensions of length, width and depth should be included in the actual fabrication.
Further, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
Example 1
Referring to fig. 1 to 3, the present embodiment provides a hydrogen production converter topology suitable for being connected to a single-phase ac system, including an ac power supply 100, a front stage rectifier module 200, a second stage conversion module 300, and a control system module 400, where the ac power supply 100 and the ac power supply 100 are single-phase ac voltage sources, the ac power supply 100 is connected in series with an ac reactor and then connected in parallel with the front stage rectifier module 200, and a low-voltage end of the parallel connection is connected to a ground point; the pre-stage rectification module 200, the pre-stage rectification module 200 has multiple groups of direct current output ends, and all the direct current output ends of the pre-stage rectification module 200 are connected with the direct current input end of the second-stage conversion module 300; the second-stage conversion module 300 is provided with a plurality of groups of direct current input ends and direct current output ends, all the direct current input ends of the second-stage conversion module 300 are connected with the direct current output ends corresponding to the front-stage rectification module 200, all the direct current output ends of the second-stage conversion module 300 are mutually connected in parallel, and the positive pole and the negative pole of the parallel direct current output ends are respectively connected with the anode and the cathode of the electrolytic cell; and the control system module 400 is used for collecting system voltage and current information, calculating and outputting a control signal, and sending the control signal to the preceding stage rectification module 200 and the second stage conversion module 300 to realize the stable work of the electrolytic cell and keep the power balance of the preceding stage rectification module 200 and the second stage conversion module 300.
Further, the alternating current power supply 100 comprises a single-phase alternating current voltage source S, an output circuit breaker CB01, a charging resistor R and a bypass contactor CB02, wherein one end of the single-phase alternating current voltage source is grounded, the other end of the single-phase alternating current voltage source is connected with the output circuit breaker and the charging resistor in series, and the charging resistor is connected with one end of an alternating current reactor after being connected with the bypass contactor in parallel; during operation, the output circuit breaker CB01 is closed firstly, the bypass contactor CB02 is kept in an open state, the pre-stage rectifier module is charged through the charging resistor R, the bypass contactor CB02 is closed after the pre-stage rectifier module is charged to a stable state, the pre-stage rectifier module carries out controllable charging, and part of full-bridge modules are cut off, so that the voltage of all the full-bridge modules rises to a rated value.
The front-stage rectification module 200 is formed by connecting a plurality of full-bridge modules in series, and after the full-bridge modules are connected in series, one end of the full-bridge modules is connected with an alternating current reactor, and the other end of the full-bridge modules is connected with an alternating current power supply and a grounding point.
Furthermore, the full-bridge module is formed by connecting a first switch device IGBT1, a second switch device IGBT2, a third switch device IGBT3 and a fourth switch device IGBT4 in a pairwise manner and then connecting the two in parallel, the connecting point of the series connection is an alternating current output end of the full-bridge module, the third switch device and the fourth switch device are connected in parallel and then connected in parallel with a module capacitor Csm, a discharge resistor Rsm and a bypass switch CBsm, and the positive electrode and the negative electrode of the module capacitor Csm are direct current output ends of the full-bridge module.
The second-stage conversion module 300 comprises a plurality of DC/DC modules, wherein the direct current input end of each DC/DC module is connected with the output end of a full-bridge module in the front-stage rectification module 200, the positive electrode and the negative electrode of the direct current output end of each DC/DC module are respectively connected with the anode and the cathode of an electrolytic cell, a fifth switching device IGBT5, a sixth switching device IGBT6, a seventh switching device IGBT7 and an eighth switching device IGBT8 in the DC/DC modules are respectively connected with a fifth diode D5, a sixth diode D6, a seventh diode D7 and an eighth diode D8 in an anti-parallel mode and are connected with each other in a full-bridge structure to form an H-bridge module, the direct current side of the H-bridge module is connected with the direct current input end of the DC/DC module, the alternating current side of the H-bridge module is connected with a primary side Tn winding of a high-frequency transformer, the two ends of a secondary side winding of the Tn-frequency transformer are respectively connected with the cathodes of a ninth diode D, the anodes of the ninth diode D9 and the twelfth diode D10 are connected to the output capacitor CONegative electrode connected to output capacitor COPositive pole and first direct current reactor LD1And a second DC reactor LD2One end connected to a first DC reactor LD1And a second DC reactor LD2And the other end thereof is connected to the cathodes of a ninth diode D9 and a twelfth diode D9, respectively.
Further, the control system module receives all the full-bridge module and DC/DC module voltages, as well as the single-phase AC grid voltage Ug and current Iac, and the electrolytic tank voltage uoAnd currentIoAnd (3) outputting all the trigger signals of the full-bridge module and the DC/DC module after information and calculation, wherein the adopted control signal calculation comprises two parts, S1: preceding stage rectification module 200 control structure and S2: the second stage transform module 300 controls the architecture.
The hydrogen production device provided by the embodiment can be connected with a single-phase alternating current power grid, the alternating current input end adopts a module cascade structure of a single bridge arm, the hydrogen production device is suitable for access of various alternating current voltage grades, the output end adopts a single sub-module capacitor as a direct current power supply, and the current output capacity is improved through double-current DC/DC conversion. Because of adopting the modular structure, a plurality of DC/DC converters can be connected in parallel to supply power to the electrolytic cell, thereby further improving the current output capability, realizing the conversion from high-voltage alternating current to low-voltage direct current and easily realizing higher voltage transformation ratio; a single-bridge-arm voltage control method is provided for a preceding stage rectifier module, and the active power output by an alternating current power supply is controlled by changing the output voltage phase of the preceding stage rectifier module, so that the power balance of an alternating current side and a direct current side is realized. And the fast tracking of the current inner loop is realized based on the proportional-resonant regulator. Meanwhile, direct current power output by the electrolytic cell is introduced into a control loop of the preceding stage rectification module, and capacitance voltage of the preceding stage rectification module is introduced into an output current control loop of the second stage conversion module, so that a coordination control function between the preceding stage rectification and the second stage conversion is realized, and the dynamic response speed of the system can be improved.
Example 2
Referring to fig. 1 to 5, a second embodiment of the present invention is based on the previous embodiment, and is different from the previous embodiment in that: the embodiment provides a control method of a hydrogen production converter topological structure suitable for being connected into a single-phase alternating current system, and the control structure of the front-stage rectification module 200 in S1 comprises the following calculation processes:
s11: calculating the phase of the power grid: the sampling value Ug of the alternating voltage is delayed for 5ms by a delay link and is connected with a phase-locked loop PLL to calculate the phase signal theta of the alternating voltage sourcegrid。
S12: calculating the phase of the alternating current: the average value of the capacitor voltage is given
And the average value u of all full-bridge module capacitor voltagesavgThe difference value is connected with the input end of a first proportional-integral regulator PI1, and the output of the PI1 regulator is the voltage phase adjustment quantity delta theta of a front-stage rectification modulev. Voltage phase adjustment amount delta thetavMultiplying the current phase adjustment quantity delta theta by a proportional coefficient of 0.5 to obtain a current phase adjustment quantity delta thetai. Then, the delta thetaiPhase theta with ac voltage sourcegridAdding to obtain an AC phase signal thetai。
S13: calculating a current amplitude signal
Output power P of hydrogen productionHAnd the effective value U of the voltage of the AC voltage sourcesRmsDividing, calculating the effective value of AC current, and adding constant
Multiplying to obtain AC current amplitude signal Iamp。
S14: calculating a given signal of an alternating current
The alternating current phase signal theta calculated in the step S12iPerforming sine operation, and calculating with S13 to obtain AC current amplitude signal IampMultiplying to obtain the final given signal I of the alternating currentref。
S15: AC current control quantity calculation
Calculating the step S14 to obtain an alternating current given signalIrefWith alternating current feedback measuring signal IacThe error signal is subtracted and the ac current control Δ u is output by the proportional-resonant regulator PR with clipping.
S16: steady state modulation signal amplitude calculation
Giving a given value Q of reactive powerrefAnd a reactive power feedback value QfbkMaking difference, the error is output by the voltage amplitude regulation delta u of the second PI regulator PI2vΔ u is a unit ofvAdding the amplitude of the alternating voltage to a given value of 1.0p.u. to obtain the amplitude u of the steady-state modulation signalamp。
S17: steady state modulation signal phase calculation
The phase signal theta of the alternating voltage sourcegridThe voltage phase adjustment quantity delta theta calculated in the step S12vAdding the signals, and performing sine operation to obtain sine information sin theta of the steady-state modulation signal phasev。
S18: steady state voltage modulation signal calculation
Calculating the steady-state modulation signal amplitude u obtained in the step S16ampSine information sin theta of the steady-state modulation signal phase calculated in the step S17vMultiplying to obtain a steady-state voltage modulation signal uv。
S19: output of preceding stage rectification trigger pulse
The AC current control quantity delta u calculated in the step S15 and the steady-state voltage modulation signal u calculated in the step S18 are comparedvAdding to obtain a modulated signal u of a preceding stage rectification modulemAnd then the output end is connected with a nearest level approximation modulation NLM and a capacitor voltage sequencing module to output trigger pulses of all full-bridge units in a preceding stage rectification module.
Further, the step S2: the second-level transformation module control structure comprises the following calculation processes:
s21: calculation of given current of electrolytic cell
The electrolytic cell is set to a given voltage
And the feedback voltage value u of the electrolytic celloMaking difference, calculating the difference value by proportional-integral regulator PI3, and outputting signal as given current value I of electrolytic bathoref。
S22: DC/DC Module given Current calculation
The electrolytic cell is given current IorefDividing the number by n of the DC/DC modules to obtain a steady-state value I of the output current of a single DC/DC moduleorefn. Then the input voltage value u of the nth DC/DC module is usedsmnGiven signal with its mean value
Making a difference and passing through a proportional regulator KpObtaining the output current regulating quantity delta I of the nth DC/DC modulesmn. The output current of the DC/DC module is regulated to a steady value IorefnAnd the nth DC/DC module output current regulating quantity delta IsmnAdding to obtain current given signal I of the nth DC/DC moduledcn_ref。
S23: phase shift angle calculation
Setting the current I of the nth DC/DC module calculated in the step S22dcn_refAnd feedback current I of nth DC/DC moduledcnCalculating the difference value through a proportional integral regulator PI4, and outputting the phase shift angle alpha of the nth DC/DC module after amplitude limitingn。
S24: trigger signal output
The output phase shift angle alpha calculated in the step S22nConnected to the 2 nd triangular wave signal to lag the 1 st triangular wave signal alpha by the 2 nd triangular wave signaln. And a given duty ratio of 0.5 is respectively connected with the 1 st triangular wave signal and the 2 nd triangular wave signal, and fifth, sixth, seventh and eighth switching device pulses in the n DC/DC modules are respectively generated by comparing the given duty ratio with the 1 st triangular wave and the 2 nd triangular wave. And the fifth switching pulse is complementary to the sixth switching pulse and the seventh and eighth switching pulses are complementary.
According to the hydrogen production device and the control method provided by the invention, the topological structure and the control module both adopt a two-stage structure, the designed second-stage conversion module can be easily transformed into a cascade structure, the direct current input end of the DC/DC conversion module is directly transformed into a series connection in sequence from head to tail, and the access of a high-voltage direct current power grid can be realized by disconnecting the preceding-stage rectification module, so that the hydrogen production device can be applied to a traditional alternating current power distribution network and a novel direct current power distribution network to produce hydrogen as one of energy storage means.
It is important to note that the construction and arrangement of the present application as shown in the various exemplary embodiments is illustrative only. Although only a few embodiments have been described in detail in this disclosure, those skilled in the art who review this disclosure will readily appreciate that many modifications are possible (e.g., variations in sizes, dimensions, structures, shapes and proportions of the various elements, values of parameters (e.g., temperatures, pressures, etc.), mounting arrangements, use of materials, colors, orientations, etc.) without materially departing from the novel teachings and advantages of the subject matter recited in this application. For example, elements shown as integrally formed may be constructed of multiple parts or elements, the position of elements may be reversed or otherwise varied, and the nature or number of discrete elements or positions may be altered or varied. Accordingly, all such modifications are intended to be included within the scope of this invention. The order or sequence of any process or method steps may be varied or re-sequenced according to alternative embodiments. In the claims, any means-plus-function clause is intended to cover the structures described herein as performing the recited function and not only structural equivalents but also equivalent structures. Other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the exemplary embodiments without departing from the scope of the present inventions. Therefore, the present invention is not limited to a particular embodiment, but extends to various modifications that nevertheless fall within the scope of the appended claims.
Moreover, in an effort to provide a concise description of the exemplary embodiments, all features of an actual implementation may not be described (i.e., those unrelated to the presently contemplated best mode of carrying out the invention, or those unrelated to enabling the invention).
It should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort might be complex and time consuming, but would nevertheless be a routine undertaking of design, fabrication, and manufacture for those of ordinary skill having the benefit of this disclosure, without undue experimentation.
It should be noted that the above-mentioned embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (10)
1. A hydrogen production converter topology suitable for accessing a single-phase alternating current system is characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
the alternating current power supply (100), the alternating current power supply (100) is a single-phase alternating current voltage source, the alternating current power supply (100) is connected in series with an alternating current reactor and then connected in parallel with the preceding stage rectifier module (200), and the low-voltage end after being connected in parallel is connected with the grounding point;
the pre-stage rectification module (200), the pre-stage rectification module (200) has a plurality of groups of direct current output ends, and all the direct current output ends of the pre-stage rectification module (200) are connected with the direct current input end of the second-stage conversion module (300);
the second-stage conversion module (300) is provided with a plurality of groups of direct current input ends and direct current output ends, all the direct current input ends of the second-stage conversion module (300) are connected with the direct current output ends corresponding to the front-stage rectification module (200), all the direct current output ends of the second-stage conversion module (300) are mutually connected in parallel, and the positive pole and the negative pole of the parallel direct current output ends are respectively connected with the anode and the cathode of the electrolytic cell;
and the control system module (400) is used for acquiring system voltage and current information, calculating and outputting a control signal, and sending the control signal to the preceding stage rectification module (200) and the second stage conversion module (300).
2. A hydrogen converter topology suitable for accessing a single phase ac system according to claim 1, wherein: the alternating current power supply (100) is composed of a single-phase alternating current voltage source, an output breaker, a charging resistor and a bypass contactor, one end of the single-phase alternating current voltage source is grounded, the other end of the single-phase alternating current voltage source is connected with the output breaker and the charging resistor in series, and the charging resistor is connected with one end of an alternating current reactor after being connected with the bypass contactor in parallel.
3. A hydrogen converter topology suitable for access to a single phase ac system according to claim 1 or 2, characterized in that: the preceding stage rectification module (200) is formed by connecting a plurality of full-bridge modules in series, one end of the series-connected full-bridge modules is connected with the alternating current reactor, and the other end of the series-connected full-bridge modules is connected with the alternating current power supply and the grounding point.
4. A hydrogen converter topology suitable for access to a single phase ac system according to claim 3, wherein: the full-bridge module is parallelly connected again by two liang of series connection of first switching device, second switching device, third switching device, fourth switching device, and the tie point of establishing ties is the alternating current output of full-bridge module, and third switching device, fourth switching device are parallelly connected back and are parallelly connected with module electric capacity, discharge resistance and bypass switch again, and the positive negative pole of module electric capacity is the direct current output of full-bridge module.
5. The hydrogen converter topology suitable for access to a single phase ac system of claim 4, wherein: the second-stage conversion module (300) comprises a plurality of DC/DC modules, the direct current input end of each DC/DC module is connected with the output end of one full-bridge module in the preceding-stage rectification module (200), the anode and the cathode of the direct current output end of each DC/DC module are respectively connected with the anode and the cathode of the electrolytic cell, a fifth switching element, a sixth switching element, a seventh switching element and an eighth switching element in each DC/DC module are respectively connected with a fifth diode, a sixth diode, a seventh diode and an eighth diode in an anti-parallel mode and are mutually connected in a full-bridge structure to form an H-bridge module, the direct current side of the H-bridge module is connected with the direct current input end of the DC/DC module, the alternating current side of the H-bridge module is connected with the primary side winding of the high-frequency transformer in parallel, the two ends of the secondary winding of the high-frequency transformer are respectively connected with the cathodes of, the anodes of the ninth diode and the twelfth diode are both connected with the cathode of the output capacitor, the anode of the output capacitor is connected with one ends of the first direct current reactor and the second direct current reactor, and the other ends of the first direct current reactor and the second direct current reactor are respectively connected with the cathodes of the ninth diode and the twelfth diode.
6. The hydrogen converter topology suitable for accessing a single phase ac system of claim 5, wherein: the control system module receives all full-bridge module and DC/DC module voltages, single-phase alternating current power grid voltage and current, electrolysis bath voltage and current information, outputs all full-bridge module and DC/DC module trigger signals after calculation, adopts control signal calculation including two parts, and adopts a control structure of a preceding stage rectification module (200) and a control structure of a second stage conversion module (300).
7. A method of controlling a hydrogen converter topology adapted for access to a single phase ac system using the topology of claim 6, wherein: the control structure of the preceding stage rectification module (200) comprises the following calculation processes,
calculating the phase of the power grid; calculating the phase of the alternating current; calculating a current amplitude signal; calculating an alternating current given signal; calculating the alternating current control quantity; calculating the amplitude of the steady-state modulation signal; calculating the phase of the steady-state modulation signal; calculating a steady-state voltage modulation signal; and outputting the preceding stage rectification trigger pulse.
8. The method of claim 7, wherein the method comprises the steps of: the second level transformation module control structure comprises the following calculation process,
calculating the given current of the electrolytic cell; the DC/DC module gives current calculation; calculating a phase shifting angle; and (6) triggering signal output.
9. The method of claim 8, wherein the method comprises the steps of: the power grid phase calculation is to connect the alternating voltage sampling value with a phase-locked loop through a delay link and calculate an alternating voltage source phase signal; and the alternating current phase calculation is to make a difference between the given capacitor voltage average value and all full-bridge module capacitor voltage average values, the difference value is connected with the input end of a first proportional-integral regulator, the output of the first proportional-integral regulator is the voltage phase adjustment quantity of a preceding stage rectifier module, the voltage phase adjustment quantity is multiplied by a proportionality coefficient of 0.5 to obtain a current phase adjustment quantity, and then the current phase adjustment quantity and the alternating current voltage source phase are added to obtain an alternating current phase signal.
10. The method for controlling a topology of a hydrogen converter suitable for access to a single-phase ac system according to claim 8 or 9, wherein: the calculation of the given current of the electrolytic cell comprises the step of calculating the difference between the given voltage of the electrolytic cell and the feedback voltage value of the electrolytic cell by a third PI regulator, and the output signal is the given current value of the electrolytic cell; the calculation of the given current of the DC/DC module comprises the steps of dividing the given current of the electrolytic cell by the number n of the DC/DC modules to obtain a steady-state value of the output current of a single DC/DC module, then making a difference between the input voltage value of the nth DC/DC module and the given signal of the average value of the input voltage value of the nth DC/DC module, obtaining the adjustment quantity of the output current of the nth DC/DC module through a proportion regulator, and adding the steady-state value of the output current of the DC/DC module and the adjustment quantity of the output current of the nth DC/DC module to obtain the given signal of the current of the nth DC/DC module.
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