CN117650708B - 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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- CN117650708B CN117650708B CN202311522179.2A CN202311522179A CN117650708B CN 117650708 B CN117650708 B CN 117650708B CN 202311522179 A CN202311522179 A CN 202311522179A CN 117650708 B CN117650708 B CN 117650708B
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- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 37
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 37
- 239000001257 hydrogen Substances 0.000 title claims abstract description 37
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000004364 calculation method Methods 0.000 claims description 15
- 230000003044 adaptive effect Effects 0.000 claims description 5
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 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 12
- 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 application 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, collecting circuit parameters and calculating terminal voltage and template voltage; s2 is output voltage outer loop control; s3, inputting W P generated by an outer ring, a feedback signal W LP, an acquired current signal I abc and a template voltage signal u pabc into an absolute logarithmic filtering algorithm, and outputting a reference current and a feedback signal W pabc; s4 is to add the reference current output by S3 and the feedback signal respectively to generate a sum feedback value W LP; 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: sampling phase voltage V abc at the net side of the three-phase hydrogen production rectifier, phase current I abc (comprising I a,Ib,Ic) and output direct-current voltage V DC, and calculating terminal voltage V t and template voltage u pabc after V abc and I abc pass through a band-pass filter (the calculation formulas of u pa,upb,upc),Vt and u pabc are respectively:
S2: the DC voltage V DC is filtered by a low-pass filter and then is combined with a set output DC reference voltage The calculation formula of V e obtained by comparison and then V e sent into a PI regulator for regulation to obtain W P,WP can be expressed as follows after discretization:
WP(n+1)＝WP(n)+KP[Ve(n+1)-Ve(n)]+KIVe(n) (3)
Wherein, K P is the proportional coefficient of the PI regulator, K I is the integral coefficient of the PI regulator, (n+1) is the parameter value of the next moment, and (n) is the parameter value of the current moment;
S3: w SP obtained by adding W P and regulated W LP is fed into absolute logarithmic filter together with template voltage u pabc and phase current I abc for regulation, and reference current is output after regulation And W pabc (including W pa,Wpb,Wpc), the discretized formula of the absolute logarithmic filter calculation formula is:
Wherein μ is the step size in the algorithm; e pabc (including e pa,epb,epc) is the adaptive integrand error of the algorithm;
S4: will be And/>Adding to generate a reference value of three-phase current/>Adding W pa,Wpb,Wpc to generate a feedback value W LP;
S5: reference value of three-phase current And compared with the three-phase current actual value I abc in the dq coordinate system, generating a modulation wave through another PI regulator, and sending the modulation wave into SVPWM modulation to finally generate a driving signal of a switching tube.
The invention further improves that: the network-side three-phase voltage V abc and the current I abc mentioned in step S1 are passed through a band-pass filter (BPF) and then subjected to corresponding calculations, and the transfer function of the band-pass filter is:
wherein k is a bandwidth coefficient of the band-pass filter, omega 0 is a basic angular frequency of the power grid, and s is a Laplacian;
the invention further improves that: the dc voltage V DC mentioned in step S2 is passed through a Low Pass Filter (LPF) and then subjected to a corresponding calculation, the transfer function of the low pass filter being:
wherein omega f is the cut-off frequency of the low-pass filter, and s is the Laplacian;
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 calculation formula of the discretization of the adaptive integrand error e pabc mentioned in step S3 is:
epabc(n)＝Iabc(n)-upabc(n)×Wpabc(n) (9)
the invention further improves that: the control in dq coordinate system mentioned in step S5 requires Clarke and Park coordinate transformation of the network side three-phase voltage V abc and current I abc acquired.
The three-phase hydrogen production rectifier topological structure is characterized in that a three-phase voltage source type PWM rectifier is connected with a Buck circuit, V a,Vb,Vc in a three-phase voltage source type PWM rectifier part is respectively three-phase alternating current input, the left ends of the three-phase voltage source type PWM rectifier part and the V a,Vb,Vc are electrically connected with each other, the right end of the three-phase voltage source type PWM rectifier part is electrically connected with the left end of a three-phase filter inductor L a,Lb,Lc, the right end of the three-phase filter inductor L a is electrically connected with an emitter of T 1 and a collector of T 4, the right end of the three-phase filter inductor L b is electrically connected with an emitter of T 2 and a collector of T 5, the right end of the three-phase filter inductor L c is electrically connected with an emitter of T 3 and a collector of T 6, and an anode of an electrolytic capacitor C is electrically connected with an emitter of T 4 and a cathode of the electrolytic capacitor C. The PWM rectifier section functions to convert the ac power of the grid to dc power.
The collector of the Buck circuit part T b is electrically connected with the anode of the electrolytic capacitor C, the emitter of the T b is electrically connected with the left end of the inductor L b and the cathode of the diode D b, the right end of the inductor L b is electrically connected with the upper end of the filter capacitor C b and the anode of the electrolytic tank, and the filter capacitor C b is electrically connected with the cathode of the electrolytic tank and the anode of the diode D b. 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 three-phase hydrogen-producing rectifier topology is shown in fig. 2, 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, the function of the part is to convert alternating current of a power grid into direct current, V a,Vb,Vc in fig. 2 are three-phase alternating current input, the left ends of the three-phase hydrogen-producing rectifier topology are electrically connected with each other, the right ends of the three-phase hydrogen-producing rectifier topology are electrically connected with the left ends of three-phase filter inductance L a,Lb,Lc, the right ends of the L a are electrically connected with an emitter of T 1 and a collector of T 4, the right ends of the L b are electrically connected with an emitter of T 2 and a collector of T3996, the collector of T 1 is electrically connected with a collector of T 2、T3 and an anode of an electrolytic capacitor C, and the emitter of T 4 is electrically connected with an emitter of T 5、T6 and a cathode of an electrolytic capacitor C.
The Buck circuit part is a step-down circuit, wherein T b is an Insulated Gate Bipolar Transistor (IGBT), L b and C b are an inductor and a filter capacitor of the Buck circuit, D b is a diode, an electrolytic tank is a load, the Buck circuit has the function of reducing the direct current output of the rectifier to the voltage required by the work of the electrolytic tank, a collector of T b in FIG. 2 is electrically connected with an anode of the electrolytic capacitor C, an emitter of T b is electrically connected with a left end of the inductor L b and a cathode of the diode D b, a right end of the inductor L b is electrically connected with an upper end of the filter capacitor C b and an anode of the electrolytic tank, and the filter capacitor C b is electrically connected with the cathode of the electrolytic tank and the anode of the diode D b.
S1: sampling phase voltage V abc at the net side of the three-phase hydrogen production rectifier, phase current I abc (comprising I a,Ib,Ic) and output direct-current voltage V DC, and calculating terminal voltage V t and template voltage u pabc after V abc and I abc pass through a band-pass filter (the calculation formulas of u pa,upb,upc),Vt and u pabc are respectively:
The three-phase voltage V abc and the current I abc on the network side are correspondingly calculated after passing through a band-pass filter (BPF), and the transfer function of the band-pass filter is as follows:
wherein k is a bandwidth coefficient of the band-pass filter, omega 0 is a basic angular frequency of the power grid, and s is a Laplacian;
S2: the DC voltage V DC is filtered by a low-pass filter and then is combined with a set output DC reference voltage The calculation formula of V e obtained by comparison and then V e sent into a PI regulator for regulation to obtain W P,WP can be expressed as follows after discretization:
WP(n+1)＝WP(n)+KP[Ve(n+1)-Ve(n)]+KIVe(n) (3)
Wherein, K P is the proportional coefficient of the PI regulator, K I is the integral coefficient of the PI regulator, (n+1) is the parameter value of the next moment, and (n) is the parameter value of the current moment;
The dc voltage V DC is passed through a Low Pass Filter (LPF) and then calculated accordingly, and 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 Laplacian;
the transfer function before discretization of the PI regulator is:
S3: w SP obtained by adding W P and regulated W LP is fed into absolute logarithmic filter together with template voltage u pabc and phase current I abc for regulation, and reference current is output after regulation And W pabc (including W pa,Wpb,Wpc), the discretized formula of the absolute logarithmic filter calculation formula is:
Wherein μ is the step size in the algorithm; e pabc (including e pa,epb,epc) is the adaptive integrand error of the algorithm;
The calculation formula of the discretization of the self-adaptive integrated function error e pabc is as follows:
epabc(n)＝Iabc(n)-upabc(n)×Wpabc(n) (9)
S4: will be And/>Adding to generate a reference value of three-phase current/>Adding W pa,Wpb,Wpc to generate a feedback value W LP;
S5: reference value of three-phase current And compared with the three-phase current actual value I abc in the dq coordinate system, generating a modulation wave through another PI regulator, and sending the modulation wave into SVPWM modulation to finally generate a driving signal of a switching tube.
The control under the dq coordinate system requires Clarke and Park coordinate transformation of the three-phase voltage V abc and the current I abc on the net side.
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; sampling phase voltage V abc at the net side of the three-phase hydrogen production rectifier, phase current I abc and output direct current voltage V DC, calculating terminal voltage V t and template voltage u pabc after V abc and I abc pass through a band-pass filter, wherein phase current I abc comprises I a,Ib,Ic, and template voltage u pabc comprises the calculation formulas of u pa,upb,upc,Vt and u pabc as follows:
S2: the output voltage outer loop control, the DC voltage V DC is passed through the low-pass filter and then is combined with the set output DC reference voltage The calculation formula of V e obtained by comparison and then V e sent into a PI regulator for regulation to obtain W P,WP can be expressed as follows after discretization:
WP(n+1)＝WP(n)+KP[Ve(n+1)-Ve(n)]+KIVe(n) (3)
Wherein, K P is the proportional coefficient of the PI regulator, K I is the integral coefficient of the PI regulator, n+1 is the parameter value of the next moment, n is the parameter value of the current moment;
S3: w SP obtained by adding W P and regulated W LP is fed into absolute logarithmic filter together with template voltage u pabc and phase current I abc for regulation, and reference current is output after regulation And the feedback signal W pabc,Wpabc includes W pa,Wpb,Wpc, and the discretized formula of the absolute logarithmic filter calculation formula is:
Wherein μ is the step size in the algorithm; e pabc is the adaptive integrand error of the algorithm, e pabc includes e pa,epb,epc;
s4: reference current output by S3 And/>Adding to generate a reference value of three-phase current/>Adding the feedback signals W pa,Wpb,Wpc output by the S3 to generate a feedback value W LP;
S5: reference value of three-phase current And compared with the three-phase current actual value I abc in the dq coordinate system, generating a modulation wave through another PI regulator, and sending the modulation wave into SVPWM modulation to finally generate a driving signal of a 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 abc and the current I abc mentioned in step S1 are calculated by passing through a bandpass filter BPF having a transfer function of:
where k is the bandwidth coefficient of the band-pass filter, ω 0 is the fundamental angular frequency of the grid, and s is the laplace operator.
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 dc voltage V DC mentioned in step S2 is passed through a Low Pass Filter (LPF) and then subjected to a corresponding calculation, the transfer function of the low pass filter being:
where ω 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 calculation formula of the discretization of the adaptive integrand error e pabc mentioned in step S3 is:
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 the dq coordinate system requires Clarke and Park coordinate transformation of the collected three-phase voltage V abc and current I abc on the grid side.
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