CN117650708A - Control method for improving performance of new energy hydrogen production system - Google Patents
Control method for improving performance of new energy hydrogen production system Download PDFInfo
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- CN117650708A CN117650708A CN202311522179.2A CN202311522179A CN117650708A CN 117650708 A CN117650708 A CN 117650708A CN 202311522179 A CN202311522179 A CN 202311522179A CN 117650708 A CN117650708 A CN 117650708A
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- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 35
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 35
- 239000001257 hydrogen Substances 0.000 title claims abstract description 35
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000004364 calculation method Methods 0.000 claims description 18
- 230000003044 adaptive effect Effects 0.000 claims description 5
- 238000005070 sampling Methods 0.000 claims description 3
- 230000009466 transformation Effects 0.000 claims description 3
- 238000001914 filtration Methods 0.000 abstract 1
- 239000003990 capacitor Substances 0.000 description 15
- 238000010248 power generation Methods 0.000 description 5
- 238000005261 decarburization Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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 invention discloses a control method for improving the performance of a new energy hydrogen production system, which belongs to the field of power electronics and comprises the following specific steps: s1 acquisition circuitParameters are calculated, and terminal voltage and template voltage are calculated; s2 is output voltage outer loop control; s3 generating the outer ringW P Feedback signalW LP Collected current signalI abc And a template voltage signalu pabc Input into an absolute logarithmic filtering algorithm and output a reference current, and a feedback signalW pabc The method comprises the steps of carrying out a first treatment on the surface of the S4 is to add the reference current output by S3 and the feedback signal to generate and feedback values respectivelyW LP The method comprises the steps of carrying out a first treatment on the surface of the S5, performing current inner loop control on the reference current signal and the actual grid current operation to generate a modulation wave, and generating a circuit driving signal through SVPWM. The control method can accurately extract the fundamental wave components of the real-time power grid voltage and power grid current, perform closed-loop control, and prolong the service life of the electrolytic tank equipment.
Description
Technical Field
The invention belongs to the technical field of power electronics, and particularly relates to a control method for improving the performance of a new energy hydrogen production system.
Background
Hydrogen is a renewable clean energy carrier, has higher potential market value in global decarburization, and the main aim of hydrogen economy is to utilize renewable energy sources such as photovoltaics, wind power and the like to generate electricity and supply power to an electrolytic tank to produce hydrogen so as to gradually replace fossil energy. Among them, the use of wind power generation for hydrogen production requires a rectifier device that converts alternating current into direct current (AC/DC). The three-phase voltage type rectifier can meet the low-voltage high-current requirement of the work of the electrolytic tank by matching with the voltage reduction circuit, but the randomness and fluctuation of the renewable energy power generation can cause the problems of background harmonic waves, unbalanced three phases and the like of the input voltage of the three-phase hydrogen production rectifier. When the input voltage of the three-phase hydrogen production rectifier is unstable, the quality of the output direct-current voltage can be influenced, and the input of the electrolytic tank is further influenced. When the input power of the electrolytic tank is not constant and the fluctuation range is large, the problems of frequent start-up and stop of the system, load fluctuation and the like can be caused. The service life of the electrolytic tank equipment can be shortened, the working efficiency of the equipment can be reduced, the hydrogen production amount can be reduced, and the development of renewable energy large-scale power generation can be severely restricted. The three-phase rectifier is used as core equipment for hydrogen production electrolytic tank input, and stable operation under fluctuating input voltage is of great importance, so that the control algorithm of the three-phase hydrogen production rectifier under voltage fluctuation is enhanced, and the stable input power of the electrolytic tank is ensured to have important practical value for a renewable energy source water electrolysis hydrogen production system.
The current common control method of the three-phase voltage type rectifier is voltage-current double PI control, but when the input voltage has the harmonic or unbalanced problem, stable output can still be provided, so that the control method of the three-phase hydrogen production rectifier is needed to be invented to ensure the stability of the output voltage when the input voltage fluctuates.
Disclosure of Invention
The invention aims to solve the technical problem of providing a control method for improving the performance of a new energy hydrogen production system, which can still ensure the stability of direct current output voltage under the condition that the input voltage at the net side of a three-phase hydrogen production rectifier fluctuates during the wind power generation of renewable energy, thereby improving the running stability of the renewable energy hydrogen production system.
In order to solve the technical purpose, the invention adopts the technical scheme that:
a control method for improving the performance of a new energy hydrogen production system comprises the following steps:
s1: phase voltage V at net side of sampling three-phase hydrogen-producing rectifier abc Phase current I abc (including I) a ,I b ,I c ) And output DC voltage V DC V is set up abc And I abc After passing through the band-pass filter, calculating the terminal voltage V t And template voltage u pabc (including u pa ,u pb ,u pc )，V t And u pabc The calculation formulas of (a) are respectively as follows:
s2: by applying a DC voltage V DC After passing through the low pass filter, the output DC reference voltage is setComparing to obtain V e Then V is taken e Sending into PI regulator for regulation to obtain W P ，W P The calculation formula of (c) can be expressed as follows:
W P (n+1)＝W P (n)+K P [V e (n+1)-V e (n)]+K I V e (n) (3)
wherein K is P For the proportional coefficient, K, of the PI regulator I The integral coefficient of the PI regulator is (n+1) the parameter value of the next moment, and (n) the parameter value of the current moment;
s3: will W P And W after adjustment LP Added W SP And template voltage u pabc Sum phase current I abc Sending the reference currents into an absolute logarithmic filter for adjustment, and outputting reference currents after adjustment And W is pabc (including W pa ,W pb ,W pc ) The discretized formula of the absolute logarithmic filter calculation formula is as follows:
wherein μ is the step size in the algorithm; e, e pabc (include e pa ,e pb ,e pc ) Is an adaptive integrand of an algorithmError;
s4: will beAnd->Reference value for generating three-phase current by addition +.>Will W pa ,W pb ,W pc Adding to generate a feedback value W LP ；
S5: reference value of three-phase currentAnd three-phase current actual value I abc And generating a modulation wave through another PI regulator after the dq coordinate system comparison, and sending the modulation wave into SVPWM modulation to finally generate a driving signal of the switching tube.
The invention further improves that: the network-side three-phase voltage V mentioned in step S1 abc And current I abc After passing through a band-pass filter (BPF), the corresponding calculation is performed, and the transfer function of the band-pass filter is as follows:
where k is the bandwidth coefficient of the band-pass filter, ω 0 The basic angular frequency of the power grid is represented by s, which is a Laplacian;
the invention further improves that: the direct voltage V mentioned in step S2 DC After passing through a Low Pass Filter (LPF), performing corresponding calculation, the transfer function of the low pass filter is:
wherein omega f Is the cut-off frequency of the low-pass filter, s is LaplacianAn operator;
the invention further improves that: the transfer function before discretization of the PI regulator mentioned in step S2 is:
the invention further improves that: the adaptive integrand error e mentioned in step S3 pabc The discretized calculation formula is as follows:
e pabc (n)＝I abc (n)-u pabc (n)×W pabc (n) (9)
the invention further improves that: the control under dq coordinate system mentioned in step S5 requires that the network side three-phase voltage V be acquired abc And current I abc Is subjected to Clarke and Park coordinate transformation.
The three-phase voltage source type PWM rectifier in the three-phase hydrogen production rectifier topological structure is connected with a Buck circuit, and the three-phase voltage source type PWM rectifier part is provided with V a ，V b ，V c Respectively three-phase alternating current inputs, the left ends of which are electrically connected with each other, and the right ends of which are respectively connected with a three-phase filter inductance L a ，L b ，L c Is electrically connected with the left end of L a Right end of (2) and T 1 Emitter of (c) and T 4 Is electrically connected with the collector electrode of L b Right end of (2) and T 2 Emitter of (c) and T 5 Is electrically connected with the collector electrode of L c Right end of (2) and T 3 Emitter of (c) and T 6 Is electrically connected with the collector of T 1 Collector and T of (2) 2 、T 3 Is electrically connected with the collector electrode of the electrolytic capacitor C, T 4 Emitter and T of (2) 5 、T 6 The emitter of the capacitor and the cathode of the electrolytic capacitor C are electrically connected. The PWM rectifier section functions to convert the ac power of the grid to dc power.
Buck circuit part T b The collector electrode of (C) is electrically connected with the anode of the electrolytic capacitor, T b Emitter and inductance L of (2) b Left end of (D) and diode D b Is electrically connected with the negative electrode of the inductor L b Right end of (2) and filter capacitor C b The upper end of the capacitor is electrically connected with the anode of the electrolytic tank, and the filter capacitor C b With cathode of electrolytic cell and diode D b Is electrically connected with the positive electrode of the battery. The Buck circuit part is a step-down circuit and is used for reducing the direct current output of the rectifier to the voltage required by the operation of the electrolytic cell.
By adopting the technical scheme, the invention has the following technical progress:
the invention provides a control method for improving the performance of a new energy hydrogen production system, which considers the problems that background harmonic waves, three-phase imbalance fluctuation and the like possibly exist at the input end of a three-phase hydrogen production rectifier under the fluctuation of renewable energy wind power generation, still can accurately extract real-time fundamental wave components of grid voltage and grid current through an absolute logarithmic filter control algorithm, thereby performing closed-loop control, solving the problem that the output direct current voltage is unstable when the voltage at the input end of the rectifier fluctuates, further causing the unstable input of an electrolytic tank, prolonging the service life of electrolytic tank equipment, improving the hydrogen production efficiency and having practical application value.
Drawings
FIG. 1 is a control flow block diagram of the present invention;
fig. 2 is a main circuit topology of the three-phase hydrogen-producing rectifier of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and detailed description:
a control method for improving the performance of a new energy hydrogen production system comprises the following steps: the control flow chart is shown in fig. 1, the topology of the three-phase hydrogen-producing rectifier is shown in fig. 2, wherein L in the three-phase voltage source type PWM rectifier part is a filter inductance, T 1～6 Is an Insulated Gate Bipolar Transistor (IGBT), C is a direct current output side voltage stabilizing capacitor, and the function of the capacitor is to convert the alternating current of the power grid into direct current, V in figure 2 a ，V b ，V c Respectively three-phase alternating current inputs, the left ends of which are electrically connected with each other, and the right ends of which are respectively connected with a three-phase filter inductance L a ，L b ，L c Is electrically connected with the left end of the L a Right end of (2) and T 1 Emitter of (c) and T 4 Is electrically connected with the collector electrode of the L b Right end of (2) and T 2 Emitter of (c) and T 5 Is electrically connected with the collector electrode of the L c Right end of (2) and T 3 Emitter of (c) and T 6 Is electrically connected with the collector of the T 1 Collector and T of (2) 2 、T 3 Is electrically connected with the collector electrode of the electrolytic capacitor C, the T 4 Emitter and T of (2) 5 、T 6 The emitter of the capacitor and the cathode of the electrolytic capacitor C are electrically connected.
The Buck circuit part is a step-down circuit, wherein T b Is an Insulated Gate Bipolar Transistor (IGBT), L b And C b Is the inductance and the filter capacitance of the Buck circuit, D b The function of the Buck circuit is to reduce the DC output of the rectifier to the voltage required for the operation of the electrolyzer, T in FIG. 2 b The collector electrode of the T is electrically connected with the anode of the electrolytic capacitor C b Emitter and inductance L of (2) b Left end of (D) and diode D b Is electrically connected with the negative electrode of the inductor L b Right end of (2) and filter capacitor C b The upper end of the filter capacitor C is electrically connected with the anode of the electrolytic tank b With cathode of electrolytic cell and diode D b Is electrically connected with the positive electrode of the battery.
S1: phase voltage V at net side of sampling three-phase hydrogen-producing rectifier abc Phase current I abc (including I) a ,I b ,I c ) And output DC voltage V DC V is set up abc And I abc After passing through the band-pass filter, calculating the terminal voltage V t And template voltage u pabc (including u pa ,u pb ,u pc )，V t And u pabc The calculation formulas of (a) are respectively as follows:
net side three-phase voltage V abc And current I abc After passing through a band-pass filter (BPF), the corresponding calculation is performed, and the transfer function of the band-pass filter is as follows:
where k is the bandwidth coefficient of the band-pass filter, ω 0 The basic angular frequency of the power grid is represented by s, which is a Laplacian;
s2: by applying a DC voltage V DC After passing through the low pass filter, the output DC reference voltage is setComparing to obtain V e Then V is taken e Sending into PI regulator for regulation to obtain W P ，W P The calculation formula of (c) can be expressed as follows:
W P (n+1)＝W P (n)+K P [V e (n+1)-V e (n)]+K I V e (n) (3)
wherein K is P For the proportional coefficient, K, of the PI regulator I The integral coefficient of the PI regulator is (n+1) the parameter value of the next moment, and (n) the parameter value of the current moment;
DC voltage V DC After passing through a Low Pass Filter (LPF), performing corresponding calculation, the transfer function of the low pass filter is:
wherein omega f The cut-off frequency of the low-pass filter, s is the Laplacian;
the transfer function before discretization of the PI regulator is:
s3: will W P And W after adjustment LP Added W SP And template voltage u pabc Sum phase current I abc Sending the reference currents into an absolute logarithmic filter for adjustment, and outputting reference currents after adjustment And W is pabc (including W pa ,W pb ,W pc ) The discretized formula of the absolute logarithmic filter calculation formula is as follows:
wherein μ is the step size in the algorithm; e, e pabc (include e pa ,e pb ,e pc ) The error of the self-adaptive integrated function of the algorithm;
adaptive integrand error e pabc The discretized calculation formula is as follows:
e pabc (n)＝I abc (n)-u pabc (n)×W pabc (n) (9)
s4: will beAnd->Reference value for generating three-phase current by addition +.>Will W pa ,W pb ,W pc Adding to generate a feedback value W LP ；
S5: reference value of three-phase currentAnd three-phase current actual value I abc And generating a modulation wave through another PI regulator after the dq coordinate system comparison, and sending the modulation wave into SVPWM modulation to finally generate a driving signal of the switching tube.
The control under dq coordinate system needs to collect three-phase voltage V at the net side abc And current I abc Is subjected to Clarke and Park coordinate transformation.
Finally, the control method is also suitable for voltage source type inverters, power quality regulators and inverter circuits of the rear stage of the doubly-fed wind driven generator.
Claims (6)
1. A control method for improving the performance of a new energy hydrogen production system is characterized by comprising the following steps: the method comprises the following steps:
s1: collecting circuit parameters and calculating terminal voltage and template voltage; phase voltage V at net side of sampling three-phase hydrogen-producing rectifier abc Phase current I abc And output DC voltage V DC V is set up abc And I abc After passing through the band-pass filter, calculating the terminal voltage V t And template voltage u pabc Phase current I abc Includes I a ,I b ,I c Template voltage u pabc Comprises u pa ,u pb ,u pc ，V t And u pabc The calculation formulas of (a) are respectively as follows:
s2: output voltage outer loop control, direct current voltage V DC After passing through the low pass filter, the output DC reference voltage is setComparing to obtain V e Then V is taken e Sending into PI regulator for regulation to obtain W P ，W P The calculation formula of (c) can be expressed as follows:
W P (n+1)＝W P (n)+K P [V e (n+1)-V e (n)]+K I V e (n) (3)
wherein K is P For the proportional coefficient, K, of the PI regulator I N+1 is the parameter value of the next moment, n is the parameter value of the current moment;
s3: will W P And W after adjustment LP Added W SP And template voltage u pabc Sum phase current I abc Sending the reference currents into an absolute logarithmic filter for adjustment, and outputting reference currents after adjustment And feedback signal W pabc ，W pabc Comprises W pa ,W pb ,W pc The discretized formula of the absolute logarithmic filter calculation formula is as follows:
wherein μ is the step size in the algorithm; e, e pabc Is an adaptive integrand of an algorithmError, e pabc Includes e pa ,e pb ,e pc ；
S4: reference current output by S3 And->Reference value for generating three-phase current by addition +.>Feedback signal W to output S3 pa ,W pb ,W pc Adding to generate a feedback value W LP ；
S5: reference value of three-phase currentAnd three-phase current actual value I abc And generating a modulation wave through another PI regulator after the dq coordinate system comparison, and sending the modulation wave into SVPWM modulation to finally generate a driving signal of the switching tube.
2. The control method for improving the performance of the new energy hydrogen production system according to claim 1, wherein the control method comprises the following steps: the network-side three-phase voltage V mentioned in step S1 abc And current I abc After passing through a band-pass filter BPF, the corresponding calculation is carried out, and the transfer function of the band-pass filter is as follows:
where k is the bandwidth coefficient of the band-pass filter, ω 0 And s is the Laplacian operator and is the fundamental angular frequency of the power grid.
3. The control method for improving the performance of the new energy hydrogen production system according to claim 1, wherein the control method comprises the following steps: the direct voltage V mentioned in step S2 DC After passing through a Low Pass Filter (LPF), performing corresponding calculation, the transfer function of the low pass filter is:
wherein omega f Is the cut-off frequency of the low pass filter and s is the laplace operator.
4. The control method for improving the performance of the new energy hydrogen production system according to claim 1, wherein the control method comprises the following steps: the transfer function before discretization of the PI regulator mentioned in step S2 is:
5. the control method for improving the performance of the new energy hydrogen production system according to claim 1, wherein the control method comprises the following steps: the adaptive integrand error e mentioned in step S3 pabc The discretized calculation formula is as follows:
e pabc (n)＝I abc (n)-u pabc (n)×W pabc (n)。 (9)
6. the control method for improving the performance of the new energy hydrogen production system according to claim 1, wherein the control method comprises the following steps: in step S5, the control under dq coordinate system needs to collect the three-phase voltage V at the net side abc And current I abc Is subjected to Clarke and Park coordinate transformation.
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