CN111962092A

CN111962092A - Off-grid independent electrolytic cell structure and electrode control method

Info

Publication number: CN111962092A
Application number: CN202010823422.4A
Authority: CN
Inventors: 涓ュ己; 严强
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-08-17
Filing date: 2020-08-17
Publication date: 2020-11-20

Abstract

The invention discloses a method for dividing an electrolytic cell into an anode electrolytic cell and a cathode electrolytic cell, wherein the anode electrolytic cell and the cathode electrolytic cell are connected and communicated at the bottom of the electrolytic cell to form a main electrolytic cell group so as to ensure that electrolyte flows between the anode electrolytic cell and the cathode electrolytic cell, a plurality of controllable anode electrodes and cathode electrodes are respectively arranged in the anode electrolytic cell and the cathode electrolytic cell, the anode electrodes and the cathode electrodes are respectively connected in series according to a rule to form an electrode group, the electrodes which are connected in series in the anode electrolytic cell and the cathode electrolytic cell are called as main electrode groups, the total number of the main electrodes is set according to the highest voltage of a fluctuation power supply, in the main electrode group, the positive electrode of the power supply is connected with a first anode, and the negative electrode of the power supply. A plurality of groups of electrodes which are connected in series with each other are set as basic electrode groups according to the lowest cut-in voltage value of a fluctuating power supply such as wind energy or solar energy, the voltage is increased, and then a certain number of electrodes which are connected in series to keep each pair of electrodes always kept at a reference voltage of about 2V, when the voltage and the current of the fluctuating power supply are continuously increased and exceed the maximum bearable range of a main electrode group, one or even a plurality of electrolytic cell groups which are connected in parallel and have the same number of electrodes which are connected in series with the main electrolytic cell group are automatically connected in parallel; on the contrary, when the voltage and the current of the fluctuating power supply continuously decrease, the parallel electrolytic cell group is automatically switched out, namely, the switching-in/switching-out of the number of electrodes in the main electrolytic cell group is controlled by the voltage change control, and the switching-in/switching-out of the parallel electrolytic cell group is controlled by the current change control, so that the aim of directly carrying out low-cost electrolysis by using a low-cost electrolysis device for renewable energy sources with very large power fluctuation and very large current fluctuation is fulfilled.

Description

Off-grid independent electrolytic cell structure and electrode control method

Technical Field

The present invention relates to the electrolysis technology of electrochemical methods.

Background

Hydrogen and oxygen are important industrial raw materials, and meanwhile, the hydrogen has the characteristic of high fuel value, is a completely clean energy source, and the application of the hydrogen energy is more and more extensive and is popular among people.

In the existing electrolytic hydrogen production industry, a plurality of groups of electrodes are arranged in parallel and vertically in an electrolytic tank, each group of electrodes is respectively arranged as an anode and a cathode, the anode is connected with a power supply anode, the cathode is connected with a power supply cathode, the middle of a cathode plate and the anode plate is isolated by a diaphragm, so that an electrolytic chamber is formed, the electrolytic chambers are mutually connected in series to form the electrolytic tank, the number of the electrolytic chambers connected in series is set by the electrolytic tank according to the direct current voltage value of the power supply, and the size of the electrolytic tank (electrode plate) is set according to the total power. In the electrolytic cell, the reference power supply voltage of each electrolytic chamber is 2V direct current voltage (the allowable variation range is 0.6-1.1 times of 2V), the size of the electrode is based on that 0.25 ampere to 0.35 ampere of current is needed per square centimeter, the total voltage of the electrolytic cell is the sum of the voltages of the electrolytic chambers, the total current is the same as that of the electrolytic chambers, therefore, the electrolytic cell needs a stable power supply as a basis, in the electrolytic hydrogen production process, the anode generates oxygen, and the cathode generates hydrogen. In the above described cell construction, each cell requires a membrane, and different types of electrolysis require different types of membranes, which increase the cost of the cell, especially PEM cells using proton membranes.

Although the inventor also applies an off-grid electrolysis control structure and mode independent of a power grid and an off-grid electrolytic cell structure and electrode control method, renewable energy sources such as off-grid wind energy/solar energy and the like can be used as a power supply for hydrogen production, so that the power cost of hydrogen production by electrolysis is reduced, but the electrolytic cell structure is the same as that of the conventional electrolytic cell, each electrolytic chamber also needs a diaphragm, or a diaphragm is also needed in the electrolytic cell, but the invention uses two independent and mutually communicated electrolytic cells instead of the diaphragm, so that the manufacturing process and the flow are simplified, the cost of electrolytic equipment is further reduced, and the electrolysis can be carried out by using a fluctuating power supply.

Disclosure of Invention

In view of the problems that the electrolytic bath needs a diaphragm and the hydrogen production needs a stable power supply, the invention provides an electrolytic bath structure and an electrode control method, which decompose one electrolytic bath into an anode electrolytic bath and a cathode electrolytic bath which are communicated with each other and respectively and centrally manage electrodes in the two electrolytic baths.

In order to achieve the purpose, the invention adopts the following technical scheme:

two independent anode electrolytic cells 1 and cathode electrolytic cells 1 ', which are communicated (or opened) at the bottom of the electrolytic cells by a pipeline 6 to form a main electrolytic cell group so that electrolyte can flow in the two electrolytic cells, or a pump can be used to make the electrolyte flow in the two electrolytic cells, a gas cell 4 and a gas hole 5 are respectively arranged in the anode electrolytic cell and the cathode electrolytic cell, a water inlet 7 and a water outlet 8 are respectively arranged in the anode electrolytic cell and the cathode electrolytic cell, a plurality of groups of anode electrodes 3 and cathode electrodes 3' are respectively arranged in the two electrolytic cells, each anode electrode corresponds to one cathode electrode, the anode electrodes and the cathode electrodes are regularly connected in series, the sizes of the electrodes connected in series are completely the same, the position of the bottom of the electrodes is higher than the pipeline 6 (or opened) connected with the electrolytic cells so as to ensure that the gases generated at the cathode and the anode cannot be mixed, a valve 9 can be arranged at each of the two ends of the pipeline, so that the pipeline with the diaphragm can be conveniently and quickly replaced; in the anode electrolytic cell and the cathode electrolytic cell, each electrode is led out of a wiring bar independently, the wiring bars are insulated from each other, the first anode is connected with the positive electrode of a power supply, and the cathode is used as a controllable contact to connect (cut in) or disconnect (cut out) different cathode electrodes through a controller 10, so that different hydrogen production amounts are generated according to the fluctuation condition of the power supply. The purpose of the controller is to control the switching in and out of the electrodes according to the state of the power supply or the user's requirements, and the electrolyzer consisting of the anodic electrolyzer and the cathodic electrolyzer is called the main electrolyzer group 11. Fig. 1 is a schematic structural diagram of the main electrolytic cell group and electrode arrangement and control, and is also taken as an abstract drawing.

In order to illustrate how the anode electrode and the cathode electrode are connected in two electrolytic cells, the connection mode of the anode electrode in the anode electrolytic cell and the cathode electrode in the cathode electrolytic cell is illustrated in fig. 2, and for convenience of illustration, 7 electrodes are respectively used in the cathode electrolytic cell and the anode electrolytic cell to form one electrolytic cell. In FIG. 2, the first anode electrode of the anode electrolytic cell is connected with the positive electrode of the power supply; the last electrode of the cathode electrolytic cell is connected with the negative electrode of the power supply, so that an electrolytic cell group consisting of 7 small electrolytic cells is formed, when the contact point is connected to 7-, the electrode is connected with all electrodes, when the contact point is connected to 6-, the electrode pair (small electrolytic cell 7) corresponding to the 7 th group is cut out, only (1-6) is connected, and the anode of the electrolytic cell 7 is not electrified, which is the reason why the negative electrode is used as the controllable contact point.

In the field of renewable energy sources such as wind energy and solar energy, electric power changes little and little with external factors, and generally, a voltage at the minimum available power is called a cut-in voltage, and a current corresponding to the cut-in voltage is called a cut-in current (Ii).

In order to cope with the influence of power supply fluctuation caused by the change of external factors, in an anode electrolytic tank and a cathode electrolytic tank, the total number of electrodes in a main electrolytic tank group is set according to the highest voltage value of a fluctuation power supply, a certain number of electrodes which are fixedly connected in series are set according to the lowest cut-in voltage value of wind energy or solar energy to form a basic electrode group, the size of the electrodes is set according to the ratio of the minimum cut-in current value corresponding to the lowest cut-in voltage value of the wind energy or solar energy to a reference current value, and the basic electrode group and the controllable series electrode group are mutually connected in series to form the basic electrode. When the power of wind energy or solar energy is increased, the voltage of the power supply is increased, the current of the power supply is increased according to a rule, and the voltage is increased by simultaneously connecting a certain number of electrodes in the electrolytic cell group so as to keep the voltage between the electrodes in a better range; conversely, when the power supply voltage is reduced, a certain number of electrodes are cut in the main electrolytic cell group; when the current continuously increases and reaches and exceeds the maximum reference current of the connected electrodes in the main electrolytic cell group, one parallel

electrolytic cell group

22, 33 or 44 and the like with the same number of electrodes as the main electrolytic cell group 11 are cut in the main electrolytic cell group in a parallel mode, the parallel electrolytic cells are respectively composed of anode electrolytic cells and cathode electrolytic cells, the structure of the electrolytic cells is the same as that of the main electrolytic cell group, and the electrodes in the parallel electrolytic cells are all composed of series electrodes. Because the current when the parallel electrolytic tanks are switched in parallel is larger than the current when the fluctuating power supply is switched in just, the area of the electrodes in the parallel electrolytic tanks can be larger than the size of the electrodes in the main electrolytic tank and can also adopt the same size, so that a combined electrolytic system consisting of two or more electrolytic tank groups which are mutually connected in parallel is formed in one electrolytic tank system, the purposes of hydrogen production and oxygen production by adopting the electrolytic system consisting of independent electrolytic tanks and the power fluctuation is very large are achieved, and the purpose of greatly reducing the hydrogen production cost is achieved.

FIG. 2 is a schematic diagram of series electrodes formed by the interconnection of the electrodes in the electrolyzer unit, FIG. 3 is a schematic diagram showing the relationship between the main electrolyzer unit 11 and each of the

parallel electrolyzer units

22, 33 in the electrolyzer system, and FIG. 4 is a schematic diagram showing the connection and control of the main electrolyzer unit 11 and the parallel electrolyzer units (22, 33.).

Detailed Description

Due to the unstable characteristics of new energy sources and the combination of power generation scales according to requirements, the following will describe in further detail the embodiments of the present invention with reference to specific examples, specifically the number of electrodes of the basic electrode group in the main electrolytic cell group, the size of the electrodes, and the cutting-in and cutting-out methods of the electrodes. Without limiting the scope of the invention, it should be understood that those skilled in the art can implement reasonable subdivision changes and combinations of the number of electrodes in the main electrolytic cell group in these embodiments, especially new reference currents, reference voltage values, or minimum cut-in voltages, cut-in currents, or ratios of minimum cut-in currents and reference currents, according to the patented method, without departing from the scope of the claims, thereby obtaining new embodiments, which are also included in the scope of the invention by changing the reference currents, reference voltages, minimum cut-in currents, and reference current ratio settings, and changes and combinations of the number of electrodes or electrode groups.

Example 1

A wind driven generator with the rated power of 100 kilowatts is selected, the generator is a three-phase permanent magnet synchronous generator, the rated voltage of the generator is 110 volts, the rated wind speed is 12 meters per second, and the output of the generator is rectified and then is connected to a direct-current bus in parallel to be used as an electrolytic power supply.

The following table I shows the power output characteristics of a certain type of wind driven generator at different wind speeds:

in one embodiment, the reference current of the electrode is set to 0.25 ampere/cm and the maximum reference current is set to 0.3 ampere/cm.

Connect the table

The specific steps of cutting in and out the electrode are as follows: according to the table I, the maximum output direct-current voltage of the fan is 146V, and a main electrode 74 pair is arranged; at a wind speed of 4 m/s, 100 kw permanent magnet generator power 3706 w, rectified dc voltage 48.8 v and dc current 75.9 a, when the reference voltage of each pair of electrodes is set at about 2 v, 25-26 series electrodes can be set at 48.8 v, in order to be able to follow the change rate of the power supply voltage, in this embodiment, 26 pairs of basic electrodes are set at 48.8 v, and then 304 cm (75.9/0.25) are needed according to the reference current of the electrodes per cm, and 75.9 a, so 304 cm is the effective size of the electrodes of the main electrode group.

When the wind speed is increased to 4.5 m/s, the dc voltage is increased to 54.9 v, with the dc current increased to 96.1 a, the dc power also increased to 5277 w, and 29 series electrodes are required for 54.9 v, and when the dc voltage is 54.9 v, the maximum power that can be carried by the 29 series electrodes is 54.9 v 304 (step size) 0.3 a (maximum reference current) 5007 w, but the power supply has an output of 5277 w, theoretically exceeding the maximum power that can be carried by the electrolytic cell at 29 pairs of series electrodes, and therefore requires a parallel electrode set (referred to as a parallel electrode set) to carry additional electrical energy (when the maximum reference current is set to 0.35 a or more, there is no need to switch in the parallel electrode set at this power). The electrode group connected in parallel and the main electrode group must have the same number of electrodes connected in series to keep the voltages of the main electrode group and the parallel electrode group consistent, but the effective size of the electrodes may be the same as the main electrode group or may be reset according to a new current, and in this embodiment, the effective size of the electrodes of the parallel electrode group is reset according to the new current.

At 54.9V, the DC current is 96.1A, the effective size of the parallel electrode group is 96.1/0.25-384 square cm (i.e. the lowest cut-in current of the parallel electrode group is increased from 75.9A of the main electrode group to 96.1A of the parallel electrode group relative to the main electrode group), the maximum power that can be carried by the 384 square cm electrode under the condition of 29 pairs of series electrodes is 6332W, and the theoretical power that can be supplied by the fluctuation power supply to the parallel electrolytic cell is only 270W (because the main electrode group and the parallel electrode group are connected in parallel, the voltages of the electrode groups are equal, and the current is distributed according to the proportion of the electrode size, so the electrode group after parallel connection has a surplus bearable capacity of 6062W (in the following embodiments, the surplus bearable power of the parallel electrode group is calibrated to be a negative value, when the negative value is a new parallel connection electrode group is not needed in parallel connection, when the wind speed is increased to 6.5 m/s, the surplus bearable capacity of 463W of the parallel electrode group still has At the time of/second, the voltage is increased to 85.3 volts, the current is increased to 232.6 amperes, at this time, the output power (power of the fluctuating power supply) of the fan is greater than the bearable power 2234 watts of the main electrode group and the parallel electrode group 66, a new parallel electrode group 77 is needed to be connected in parallel, the effective size of the electrodes in the parallel electrode group 77 is set according to 232.6 amperes, the size is 232.6/0.25 ═ 930.4 square centimeters, the actually consumed power of the three electrode groups (the main electrode group, the parallel electrode group 66 and the parallel electrode group 77) which are connected in parallel is only 19840 watts (power supply power), the three electrode groups have a surplus bearing capacity of 21574 watts, and only when the output power of the fan (the fluctuating power supply) is greater than the bearable power of the connected electrode groups, a new electrode group needs to be connected in parallel (the output power of the generator cannot be greater than.

Example 2

Example 2 the same wind turbine as in example 1 was used, but the set reference current was reduced to 0.07 amps per square centimeter, and the maximum reference current was still 0.3 amps per square centimeter.

In the same manner as in example 1, according to table one, the maximum output dc voltage of the blower is 146 v, and the pair of main electrode groups 74 is provided; when the effective power of the fan is switched on, the direct current voltage is 48.8V, the basic electrode is provided with 26-level series electrodes, when the direct current is 75.9A, the reference current is reduced to 0.07A, the size of the main electrode is 75.9/0.07-1085 square centimeters, a parallel electrode group is not required to be connected below the wind speed of 9 m/s, only when the wind speed is more than 9 m/s, the output power of the fan (power supply) is more than the bearable power of the electrode group and an electrode group is required to be connected in parallel, and under the condition that the size of the electrode of the parallel electrode group is the same as that of the main electrode, the requirement of the output power of the fan can be met under the rated wind condition without increasing a.

Example 3

Example 3 is the same wind turbine as in example 1 but with the reference current set to 0.037 amps per square centimeter and the maximum reference current set to 0.333 amps per square centimeter.

According to the first table, the maximum output dc voltage of the fan is 146 v, the pair of main electrodes 74 is set, when the active power of the fan starts to be switched on, the dc voltage is 48.8 v, the basic electrode set is set to be 26 pairs, the dc current is 75.9 a, the reference current is reduced to 0.037 a, the maximum reference current is 0.333 a per square centimeter, the electrode effective size is 75.95/0.037-2053 cm, 2053 cm per square centimeter, the voltage at the maximum power is 146.3 v and 683.5 a current, under the condition that the maximum allowable reference current is increased to 0.333 a per square centimeter, the power which can be carried is 100, 018 w, which is larger than the maximum power of the fluctuating power supply, and the main electrode set can still meet the requirement without the parallel electrode sets. However, under low wind speed, the power is relatively low, the gas output of hydrogen production and oxygen production is less, the equipment works under the condition of low load for a long time, and the effective utilization rate of the equipment is lower.

Example 4

In example 4, 2 wind power generators identical to those in example 1 were rectified and then outputted in parallel as a power source for electrolysis, and the reference current was set to 0.1 ampere per square centimeter and the maximum reference current was set to 0.333 ampere per square centimeter.

The total number of the main electrode groups is 74 pairs according to the maximum voltage of 146V, when the effective power of the fan is switched on, the direct current voltage is 48.8V, the basic electrode groups are 26 pairs, the switching-on current is 151.85 amperes, the reference current is set to be 0.1 ampere per square centimeter, the maximum reference current is set to be 0.333 ampere per square centimeter, the effective electrode size of the main electrode groups is 151.85/0.1-1519 square centimeter, 1519 square centimeter electrodes are not required to be connected in parallel when the wind speed is not more than 7 m/s, and only when the wind speed is more than 7 m/s, one electrode group is required to be connected in parallel. In the embodiment, the electrode size of the parallel electrode group is the same as that of the electrodes in the main electrode group, one electrode group is connected in parallel when the wind speed is lower than 10.5 m/s, and the second electrode group is required to be connected in parallel when the wind speed reaches or is higher than 10.5 m/s. However, if the size of the electrodes in the parallel electrode group is set according to the current 534 amperes at the wind speed of 7.5 m/s, the size of the electrodes in the parallel electrode group is 534/0.1-5340 square centimeters, and one electrode group can be connected in parallel to meet the requirement of the fluctuating power supply.

Example 5

Example 5 a 1500 kw doubly-fed wind generator was used as the electrolysis power source, and the wind/power characteristics of the wind turbine are shown in table two below, because the voltage and frequency of the doubly-fed wind generator are the same in most wind speed ranges, the power difference is only shown in the current,

example 5 the reference current was set to 0.055 amps per square centimeter and the maximum reference current was set to 0.3 amps per square centimeter, with 74 pairs of primary electrode sets with electrode sizes 376/0.055 to 6836 square centimeters due to the constant voltage. When the wind speed reaches 7.5 m/s, an electrode group is required to be connected in parallel, the size of the electrode of the parallel electrode group is 2502/0.055 which is 45486 square centimeters, one basic electrolytic tank and one parallel electrolytic tank can meet the requirement under the rated power of 12 m/s, and the surplus of nearly 80 kilowatts is still remained, so that the size of the parallel electrolytic tank can be properly reduced to reduce the equipment cost.

Example 6

Example 6 is a solar array consisting of 2000 groups of 250 watt 24 volt solar panels connected in parallel by 4 strings of 500 strings to form a solar array of 144 volt (145 volt) dc 500 kw. The reference current was set to 0.2 amps per square centimeter and the maximum reference current was set to 0.3 amps.

When weak sunlight irradiates the solar panel, the initial voltage is 40V. The current is 1000 amperes, the effective size of the serial electrolytic cell is 1000 × 10000/2000 ═ 5000 square centimeters, when the voltage rises to 65 volts, one electrolytic cell needs to be connected in parallel, the effective size of the electrolytic cell is 1625 × 10000/2000 ═ 8125 square centimeters, after one electrolytic cell is connected in parallel, even when the sunlight is the strongest, the electrolytic cell still has surplus capacity of 70 kilowatts, therefore, the actual electrolytic cells connected in parallel can be properly reduced in area, so as to reduce the cost.

Example 7

Example 7 is a solar array of the same composition as example 6, but in example 7 the reference current was set to 0.095 amps per square centimeter and the maximum reference current was set to 0.3 amps. In example 7, since the reference current is reduced from 0.2 of example 6 to 0.095 ampere per square centimeter of example 7, even when the sunlight is the strongest, there is no need to connect an electrolytic cell in parallel, but the basic size of the electrolytic cell is increased from 5000 square centimeters of example 6 to 10526 square centimeters of example 7, and when the sunlight is not strong enough, the utilization rate of the electrolyzer is low.

Through the combination description of the above 7 embodiments, countless combinations can be generated by changing parameters such as the reference current value, the maximum reference current value, the cut-in voltage, the ratio of the minimum cut-in current and the reference current, and new combinations of different types of main electrode groups and parallel electrode groups are formed. Meanwhile, as is clear from the 7 exemplary embodiments, the patent is a fusion innovation under the condition of fully understanding the characteristics of wind energy, solar energy power and electrolysis with very large energy fluctuation, and should be patented.

Description of the figures and embodiments

FIG. 1 is a schematic diagram of the results of the anode electrolytic cell and the cathode electrolytic cell group and the arrangement and control of the electrodes, and is also a schematic diagram in an abstract.

FIG. 2 is a schematic view showing the connection of electrodes in series with each other in an anode electrolytic cell and a cathode electrolytic cell

FIG. 3 is a schematic diagram showing the relationship between the main and parallel electrolyzer groups

FIG. 4 is a schematic diagram showing the control method of the cut-in and cut-out of the series electrodes and the cut-in and cut-out of the parallel electrolytic cell set in the main electrolytic cell set

Example 1, a single generator with 0.25 amps as the reference current

Example 2, a single generator with 0.07 ampere as reference current

Example 3, a single generator with 0.037 amps as the reference current scheme

Example 4, two identical generators are connected in parallel as power supply, and 0.1 ampere is adopted as reference current scheme

Example 5, a double-fed 1.5 mw wind turbine is used as a power supply, and a scheme of 0.055 ampere as a reference current is adopted

Example 6, a 500 kilowatt 144 volt solar array as the power source, with 0.2 amps as the reference current scheme

Example 7, a 500 kw 144 v solar array was used as the power source with 0.095 amps as the reference current scheme

The above description is only a representative embodiment of the present invention, and the variation and combination of the number of the electrodes in the anode electrolytic cell and the cathode electrolytic cell, and the variation and combination of the number of the parallel electrolytic cells according to the claimed method of the present invention are all covered by the present invention.

Claims

1. A control mode of an electrolytic cell structure and electrodes is characterized in that a power supply required by electrolysis is a power supply with power fluctuation, and the fluctuation range from the available minimum power to the maximum power of the power supply fluctuation is more than 3.

2. A control method of an electrolytic cell structure and electrodes is characterized in that a main electrolytic cell group consists of an anode electrolytic cell and a cathode electrolytic cell which are communicated with each other at the bottom position of the electrolytic cell, the bottom position of the upright and parallel electrodes in the electrolytic cell is higher than the position (such as a plurality of pipelines) where the anode electrolytic cell and the cathode electrolytic cell are communicated with each other, gas cells and gas outlet holes are arranged in the anode electrolytic cell and the cathode electrolytic cell, water inlet holes and water outlet holes are respectively arranged in the anode electrolytic cell and the cathode electrolytic cell, a plurality of anode electrodes and cathode electrodes with the same number and size are respectively arranged in the anode electrolytic cell and the cathode electrolytic cell, a plurality of groups of electrodes which are mutually connected in series are respectively arranged in the anode electrolytic cell and the cathode electrolytic cell to form a basic electrode group, and a plurality of groups of controllable series electrode groups are mutually connected in series to form a main electrode group in the main electrolytic cell group, and the cut-in or cut-out of the electrodes in the series electrode group is controlled by the controller.

3. The process according to claim 2, characterized in that the size of the electrode levels in the anolyte and catholyte tanks is set according to the ratio (Ii/Ib) of the cut-in current (lowest cut-in current Ii) corresponding to the lowest cut-in voltage of the fluctuating power supply to the set reference current Ib, and the size of the electrode levels is the same, the ratio Ii/Ib ranges from 0.0001 to 1, the reference current Ib ranges from 0.01 to 1 ampere per square centimeter, the total number of electrodes is set according to the maximum value of the voltage of the fluctuating power supply, the number of basic electrode sets is set according to the lowest cut-in voltage value of the fluctuating power supply, and the basic electrodes are fixedly connected in series.

4. The process of claim 2, wherein the main cell bank and the parallel cell bank are connected in parallel with each other, and the parallel cell bank also comprises an anode cell and a cathode cell, respectively, and the number of the electrodes is the same as that of the main cell bank, and the number of the parallel cell banks can be from 1 to 10 in a serial controllable connection mode.

5. The system of claim 2, wherein the positive pole of the direct current source is connected to the first positive pole of the anode cell, and the negative pole of the direct current source is connected to the negative pole of the last basic electrode as a controllable contact point in the cathode cells of the main cell group; in parallel electrolysis cells, the negative pole of the power supply is connected as a controllable contact to the cathode in the cathode electrolysis cell.

6. The method of claim 2, wherein the electrodes are connected or disconnected in series in the electrolytic cell according to the positive and negative 20% of the voltage variation range of the electrodes in the previous or next group.

7. The system of claim 2, wherein the on/off switching of the series electrodes in the cell banks, the parallel on/off switching between the main cell banks and the parallel cell banks is controlled by a controller based on the power variation characteristics of the fluctuating power supply, the controller being configured to detect the voltage, current and power of the fluctuating power supply.