CN110734041A - control system and control method for power supply of high-power ozone generator - Google Patents

control system and control method for power supply of high-power ozone generator Download PDF

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CN110734041A
CN110734041A CN201911044662.8A CN201911044662A CN110734041A CN 110734041 A CN110734041 A CN 110734041A CN 201911044662 A CN201911044662 A CN 201911044662A CN 110734041 A CN110734041 A CN 110734041A
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ozone
power
generation area
yield
ozone generation
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CN110734041B (en
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陈纪援
陈少梅
刘高斌
张原�
林春源
王建春
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Fujian Longking Desulphurization & Denitrification Engineering Co Ltd
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Fujian Longking Desulphurization & Denitrification Engineering Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B13/00—Oxygen; Ozone; Oxides or hydroxides in general
    • C01B13/10—Preparation of ozone
    • C01B13/11—Preparation of ozone by electric discharge
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B13/00—Oxygen; Ozone; Oxides or hydroxides in general
    • C01B13/10—Preparation of ozone
    • C01B13/11—Preparation of ozone by electric discharge
    • C01B13/115—Preparation of ozone by electric discharge characterised by the electrical circuits producing the electrical discharge
    • 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
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
    • H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
    • H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
    • H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B2201/00—Preparation of ozone by electrical discharge
    • C01B2201/10—Dischargers used for production of ozone
    • C01B2201/14—Concentric/tubular dischargers
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B2201/00—Preparation of ozone by electrical discharge
    • C01B2201/90—Control of the process

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Oxygen, Ozone, And Oxides In General (AREA)

Abstract

The invention discloses a control system and a control method of high-power ozone generator power supplies, wherein the system comprises N oxygen flowmeters, N ozone concentration meters, N power meters, N ozone power supplies and upper computers, wherein the upper computers acquire oxygen flow and ozone concentration at an air outlet of an ozone generation area and output power of the ozone power supplies.

Description

control system and control method for power supply of high-power ozone generator
Technical Field
The invention relates to the technical field of ozone generators, in particular to a control system and a control method for power supplies of high-power ozone generators.
Background
In practical application, the active power applied to the resistors of each ozone discharge tube in the ozone discharge tube is adjusted by changing the voltage applied to the ozone discharge tube, so as to achieve the purpose of controlling the ozone yield of the discharge tube.
The power supply mode of the ozone generator is generally two, 1) single power supply (see fig. 1), namely all ozone discharge tubes of the ozone generator are electrically connected in parallel with blocks, and a system is powered by ozone power supplies, 2) multi-power supply (see fig. 2), namely the ozone discharge tubes of the ozone generator are divided into a plurality of parts, the ozone discharge tubes of each part are electrically connected in parallel to form independent electric units, each electric unit is powered by ozone power supplies, wherein each independent electric units correspond to ozone power supplies, and each ozone power supply does not depend on other power supplies to work independently.
The single power supply mode has the advantages of simple electrical structure, relatively simple control, small occupied area and low cost, but also has the following defects and technical difficulties:
1. specifically, when the ozone generator produces hundreds of kilograms of ozone per hour and the electric power of the ozone generator reaches MW (megawatt) level, an Insulated Gate Bipolar Transistor (IGBT) module is adopted as a high-frequency alternating current power supply of a switching device (the switching frequency is above 5 kHz), the high-frequency alternating current power supply is limited by the performance of the IGBT device, and the high-frequency alternating current power supply is very difficult to design and manufacture or even cannot be realized.
2. Because the single power supply mode is to connect hundreds of ozone discharge tubes in parallel, if the electrical gap of or more ozone discharge tubes becomes small or the insulation breaks down, the voltage of all ozone discharge tubes cannot be increased, which restricts the ozone output and greatly affects the operational reliability of the ozone generator.
3. The electrical energy utilization efficiency of a single powered ozone generator cannot be adjusted and mined by means of optimized control because all ozone discharge tubes are electrically connected in parallel, and as a result, more electrical energy is consumed under the same ozone production.
Although the multi-power supply system can solve the above-mentioned problems of the single power supply system, in practical applications, each ozone discharge tube is not identical, and from the viewpoint of the power utilization rate (i.e. the rate of change of the ozone output to the consumed power), not only the power utilization rate of each ozone discharge tube is different, but also the power utilization rate is dynamically changed.
Disclosure of Invention
In view of this, the invention discloses control systems and control methods for a high-power ozone generator power supply, so as to correspondingly adjust the power of an ozone power supply corresponding to an ozone generation area according to different electric energy utilization rates of ozone discharge tubes in the ozone generation area, thereby improving the overall electric energy utilization rate of the ozone generator, reducing the operation cost, and realizing energy conservation and consumption reduction.
control system of power supply of high-power ozone generator, comprising N oxygen flowmeters, N ozone concentration meters, N power meters, N ozone power supplies and upper computers, wherein N is a positive integer larger than 1;
each oxygen flowmeter is arranged on the air outlets of ozone generation areas of the ozone generator and is used for collecting the oxygen flow at the corresponding air outlet, wherein a generation chamber of the ozone generator is divided into N ozone generation areas according to a preset area division principle, ozone discharge tubes in the ozone generation areas are electrically connected in parallel, the ozone generation areas are electrically insulated, the air outlets of the ozone generation areas are independent, each ozone power supplies are only responsible for supplying power to ozone generation areas, and the ozone power supplies are independent;
each ozone concentration meter is arranged on the air outlets of ozone generating areas of the ozone generator and is used for collecting the ozone concentration at the corresponding air outlet;
each power meter is arranged on ozone power supplies and is used for reading the output power of the corresponding ozone power supply;
the upper computer is respectively connected with each oxygen flow meter, each ozone concentration instrument, each power meter and each ozone power supply, and is used for acquiring the output power of each ozone power supply, the oxygen flow and the ozone concentration at the air outlet of each ozone generation area, obtaining the ozone yield of each ozone generation area according to the oxygen flow and the ozone concentration of ozone generation areas, when the ozone generator starts to work, setting the power of each ozone generation area as the maximum allowable power of the ozone generation area, obtaining the initial ozone yield of each ozone generation area, adding the initial ozone yields of the ozone generation areas, calculating the initial actual total ozone yield of the ozone generator, judging whether the initial actual total ozone yield is smaller than the preset total ozone yield of a , setting the preset total ozone yield of a as the difference between the target total ozone yield and the allowable error, setting the allowable error as the difference between the actual total yield and the target total ozone yield, if the power of each ozone generation area is smaller than the preset total ozone generation power, and calculating the target total ozone generation power of the current total ozone generation area if the current total ozone generation power is smaller than the preset total ozone generation power, and the target ozone generation area, and calculating the current total ozone generation power of the current total yield of the corresponding to obtain the corresponding to the target total ozone generation power of the ozone generation area, and calculating the current total yield of the corresponding to obtain the current total ozone generation power of the ozone generation area if the power of the ozone generator, and the power of the power meter and the power meter, and the power of the power meter, if the power of the power meter are smaller than the power meter.
Optionally, the ozone power supply is connected with the upper computer through an ethernet or an RS-485 serial port.
A control method of power supply of high power ozone generator, the control method is applied to the upper computer in the control system of claim 1, the control method includes:
when the ozone generator starts to work, setting the power of each ozone generation area as the maximum allowable power of the ozone generation area;
acquiring initial ozone yield of each ozone generation area, adding the initial ozone yields of the ozone generation areas, and calculating to obtain initial actual total ozone yield of the ozone generator;
judging whether the initial total actual ozone yield is less than th preset total ozone yield, wherein the th preset total ozone yield is the difference between the target total ozone yield and an allowable error, and the allowable error is the allowable error between the actual total ozone yield and the target total ozone yield;
if not, setting the power of each ozone generation area as the difference value between the current power and the power adjustment step length;
after the ozone generator works for a preset time period, acquiring the current ozone output of each ozone generation area, adding the current ozone outputs of the ozone generation areas, and calculating to obtain the current actual total ozone output of the ozone generator;
calculating the sensitivity of each ozone generation area, wherein the sensitivity is the quotient of the yield difference and the power adjustment step length of the same ozone generation area in the preset time period, and the yield difference is the yield difference between the current ozone yield and the initial ozone yield of the same ozone generation area;
judging whether the current actual total ozone output is greater than a second preset total ozone output, wherein the second preset total ozone output is as follows: the sum of the total target ozone production and the tolerance;
if so, reducing the output power of the ozone power supply corresponding to the ozone generation area with the minimum control sensitivity;
if not, the output power of the ozone power supply corresponding to the ozone generation area with the highest control sensitivity is increased.
Optionally, the controlling the output power of the ozone power supply corresponding to the ozone generating region with the minimum sensitivity to be reduced specifically includes:
judging whether the difference value between the output power of the ozone power supply corresponding to the ozone generation area with the minimum sensitivity and the power adjustment step length is smaller than the minimum allowable power of the ozone power supply corresponding to the ozone generation area with the minimum sensitivity;
if so, controlling the output power of the ozone power supply corresponding to the ozone generation area with the minimum sensitivity to be reduced to the minimum allowable power;
and if not, controlling the output power of the ozone power supply corresponding to the ozone generation area with the minimum sensitivity to reduce the power adjustment step length.
Optionally, the increasing of the output power of the ozone power supply corresponding to the ozone generation region with the highest control sensitivity specifically includes:
judging whether the difference value between the output power of the ozone power supply corresponding to the ozone generation area with the maximum sensitivity and the power adjustment step length is larger than the maximum allowable power of the ozone power supply corresponding to the ozone generation area with the maximum sensitivity;
if yes, controlling the output power of the ozone power supply corresponding to the ozone generation area with the maximum sensitivity to be increased to the maximum allowable power;
and if not, controlling the output power of the ozone power supply corresponding to the ozone generation area with the maximum sensitivity to increase the power adjustment step length.
Optionally, before the output power of the ozone power supply corresponding to the ozone generation region with the highest control sensitivity is increased, the method further includes:
judging whether the current actual total ozone yield is less than the th preset total ozone yield or not;
if so, controlling the output power of the ozone power supply corresponding to the ozone generation area with the highest sensitivity to be increased;
if not, returning to the step, after the ozone generator works for a preset time period, obtaining the current ozone output of each ozone generation area, adding the current ozone outputs of the ozone generation areas, and calculating to obtain the current actual total ozone output of the ozone generator.
Optionally, the method further includes:
and after the preset delay time, taking the current ozone output of each ozone generation area as the initial ozone output, returning to the execution step, and after the ozone generator works for the preset time period, continuously acquiring the ozone output of each ozone generation area so as to control the ozone power supply.
The invention discloses a control system and a control method of power supplies of a high-power ozone generator, which comprises N oxygen flowmeters, N ozone concentration meters, N power meters, N ozone power supplies and upper computers, wherein the upper computers acquire oxygen flow at an air outlet of an ozone generation area acquired by the oxygen flowmeters, ozone concentration of the ozone generation area acquired by the ozone concentration meters and read output power of the corresponding ozone power supplies, ozone output of the ozone generation area is obtained according to the oxygen flow and the ozone concentration of ozone generation areas, initial actual total ozone output of the ozone generator is calculated by adding the acquired initial ozone output of each ozone generation area, when the initial actual total ozone output is not less than the th preset total output, the power of each ozone generation area is set to be a difference value between the current power and a power adjustment step length, when the ozone generator works for a preset time period, the acquired current total ozone generation area is added to obtain current actual total ozone output, the calculated sensitivity of each ozone generation area is adjusted to be a difference value between the current power and the power adjustment step length, when the ozone generation area works for the preset total ozone generation area is a time period, the power of the power supply, the power of the power generation area is adjusted to be a lower power, and the power of the power generation area corresponding to be a power adjustment power of the power supply, if the power generation area is lower than the power adjustment power of the power generation area, the power adjustment power of the power generation area, the power adjustment power generation area is adjusted if the power generation area is lower power of the power generation area, the power generation area is lower power generation area, the power adjustment area is determined by adding area, the power adjustment area, the.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the disclosed drawings without creative efforts.
FIG. 1 is a schematic diagram of the power supply mode of a single power supply of an ozone generator;
FIG. 2 is a schematic diagram of a power supply mode of multiple power supplies of an ozone generator;
FIG. 3 is a schematic diagram of the mechanism of dielectric barrier discharge ozone generation;
FIG. 4 is a circuit diagram of an equivalent circuit model of an ozone discharge tube of an ozone generator;
FIG. 5 is a schematic diagram of a resonant circuit;
FIG. 6 is a schematic diagram of a circuit topology of a mainstream ozone power supply;
FIG. 7 is a graph showing the relationship between the ozone output of a 20kg/h (20 kg ozone per hour) ozone generator and the active power applied to the ozone generator;
FIG. 8 is a graph of the effect of oxygen flow on ozone production;
FIG. 9 is a schematic structural diagram of a control system of power supplies of a high-power ozone generator disclosed in an embodiment of the invention;
FIG. 10(a) is a schematic diagram showing the division of the ozone generating regions disclosed in the embodiment of the present invention;
FIG. 10(b) is a schematic diagram of another ozone generation regions disclosed in the embodiment of the present invention;
FIG. 10(c) is a schematic diagram of another ozone generation regions disclosed in the embodiment of the present invention;
FIG. 11 is a flow chart of a control method for power supplies of a high-power ozone generator disclosed in an embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only partial embodiments of of the present invention, rather than all embodiments.
To facilitate understanding of the technical solutions to be protected by the present invention, the following description of the technical background of the present invention is provided, as follows:
at present, in practical engineering at home and abroad, Dielectric Barrier Discharge (DBD) is the main method for industrial production of ozone, see the schematic diagram of the mechanism for generating ozone by Dielectric Barrier Discharge shown in fig. 3, DBD is kinds of gas Discharge inserted in a Discharge space, the mechanism of ozone generation by a DBD type ozone generator is that an electric field is formed between an insulating medium and a Discharge air gap by applying an alternating voltage on an electrode, oxygen molecules are ionized under the effect of electric field energy to form oxygen atoms in a free state due to the narrow Discharge air gap and the large intensity of the electric field when oxygen passes through the Discharge air gap, and then the oxygen atoms in the free state and the oxygen molecules are recombined to form ozone, and the change process can be expressed by the following equation:
e-+O2->2O+e-；
O+O2+M->O3+M。
the generation chamber of high-power ozone generators is composed of a plurality of ozone discharge tubes, and more typical high-power ozone generators have thousands of ozone discharge tubes, when the frequency of the voltage applied to the ozone discharge tubes is high enough, from the circuit point of view, the ozone discharge tubes can be equivalent to equivalent capacitors C and equivalent resistors R which are connected in parallel, and specifically refer to the circuit equivalent model circuit diagram of the ozone discharge tubes of the ozone generator shown in fig. 4.
At present, inductors are mostly connected in series to form a resonant circuit, referring to a schematic diagram of the resonant circuit shown in fig. 5, the resonant circuit includes an alternating current voltage source, an inductor L, a voltage V, a capacitor C and a resistor R, , which applies a square wave alternating current voltage, the operating frequency of the square wave alternating current voltage is adjusted near the resonant frequency, then the frequency and/or duty ratio is finely adjusted to change the voltage V applied to the ozone discharge tube, so as to adjust the active power (equal to V2/R) applied to each ozone discharge tube resistor R, thereby achieving the purpose of controlling the ozone output of the discharge tube.
, see fig. 7 for a graph of the relationship between the ozone production of an ozone generator at 20kg/h (20 kg ozone produced per hour) and the active power applied to the ozone generator, the abscissa of the curve is the active power applied to the ozone generator (in kW) and the ordinate is the ozone production per hour (in kg), it is clear that the change in ozone production is not linear with the change in power, but the ozone production increases gradually with increasing power, but the production does not increase substantially as the power continues to increase to a certain extent, so-called "saturation" is reached, furthermore, it can be seen from fig. 7 that at different power points, although the power increase is the same, the ozone production increase is not the same, and may even be very different, see fig. 7, although at power point P100 and power point P200, Δ P is equal to 50, Δ OUT 365.82 is much greater than Δ P1, i.e. the power output of the ozone generator is not changed as a constant power derivative, i.e. Δ P34, Δ P — P34, which is not changed in real time, i.e. when the power of the process is changed more slowly than the power derivative P38, i.e. when the power of the ozone generator is changed, which Δ OUT — P is equal to 50, i.e. when Δ P1, which is not changed, which is equal to a derivative, i.e. when the power of the ozone generator is constant, i.e. constant, which is not changed, i.e. constant, i.
In addition, the ozone yield is related to the power applied to the ozone discharge tube, as well as the oxygen flow rate, the oxygen concentration, the ozone discharge tube temperature, the moisture content and impurities of the gas source, and the degree of cleaning of the tube wall of the ozone discharge tube. The effect of oxygen flow on ozone production is plotted in figure 8. However, these factors tend to be dynamically changing, and the conditions of each ozone discharge tube are not identical to each other, and from the point of view of power utilization (i.e., the rate of change of ozone production to power consumed) not only are each ozone discharge tube different, but also are dynamically changing. This means that the ozone generator comprising the ozone discharge tube can maximize the overall power utilization efficiency.
The production of ozone typically requires a large amount of electrical energy. For an ozone generator using oxygen as a gas source, about 8kWh of electric energy is consumed for producing 1kg of ozone, and about 14kWh of electric energy is consumed for producing 1kg of ozone, while several hundreds of kg/h of ozone generator are often required for some industrial industries such as sewage treatment. Therefore, how to improve the electric energy utilization rate of the ozone generator, namely, how to reduce the electric energy consumed by the ozone output per kilogram has important significance and great economic benefit.
The existing ozone generator with a multi-power supply mode mainly considers how to improve the electric energy utilization rate from the aspects of the body design and the manufacture of the ozone generator, for example, how to make the oxygen distribution more uniform, how to evenly radiate the cooling water, how to control the moisture and the impurities in an air source, how to improve the processing precision so as to ensure that the discharge voltage of a tube meets the design requirement, and the like, and the optimization measures are not sought from the aspect of the control mode of a power supply.
So far, in the technical field of ozone generators, the power supply optimization control of a high-power ozone generator is not realized on the premise of ensuring the normal operation of a high-power ozone generator system, so that the overall electric energy utilization rate of the ozone generator is improved, the operation cost is reduced, and the energy conservation and consumption reduction are realized.
Based on this, the embodiment of the invention discloses a control system and a control method for power supplies of a high-power ozone generator, which comprises N oxygen flowmeters, N ozone concentration meters, N power meters, N ozone power supplies and upper computers, wherein the upper computers acquire oxygen flow at an air outlet of an ozone generation area acquired by the oxygen flowmeters, ozone concentration of the ozone generation area acquired by the ozone concentration meters and read output power of the corresponding ozone power supplies, ozone output of the ozone generation area is obtained according to the oxygen flow and the ozone concentration of ozone generation areas, the acquired initial ozone output of each ozone generation area is added to obtain initial actual total ozone output of the ozone generator, when the initial actual total ozone output is not less than preset total ozone output, the power of each ozone generation area is set as a difference value between the current power and the power adjustment, when the ozone generator works for a preset time period, the acquired current ozone generation area is added to obtain current actual total ozone output of the ozone output, the calculated sensitivity of each ozone generation area is equal to the current power adjustment power of the power supply and the power adjustment step length of the power adjustment, if the current power generation area is equal to the power of the power generation area, the power adjustment of the ozone generation area is equal to ozone generation area, the power output power of the power supply, if the power adjustment is equal to the current power of the power generation area, the power adjustment is equal to the power adjustment power of the power adjustment area, the power of the power adjustment power generation area, the power adjustment power of the power generation area, the power of the power generation area is equal to the power of the power adjustment power of the power generation area, the power of the power generation area, the power adjustment power generation area is equal to the power of the power adjustment power generation area, otherwise, the power of the power adjustment area.
In addition, in the whole power regulation process, the corresponding relation curve of the ozone yield of the ozone generation area and the active power applied to the ozone generation area is not considered, the position of the regulated power point on the curve is not considered, the whole process is regulated according to the curve change rate of the current power point accessory, and the dynamic regulation is also carried out, so that the automatic regulation of the power supply of the high-power ozone generator can be realized according to the difference of the power point and/or the change of the curve.
It should be noted that the control method for the power supply of the high-power ozone generator disclosed by the invention is a corresponding relation curve established between the ozone output of the ozone generator and the active power applied to the ozone generator, and is based on the following characteristics:
1) the rate of change (derivative) of the curve of correspondence of the ozone production of the ozone generator and the active power applied to the ozone generator decreases progressively with increasing active power, and the ozone production hardly increases after the active power has increased to , i.e. it enters a so-called "saturated" state.
Referring to fig. 7, when the active power (hereinafter, denoted by P) is changed from P100 to P150, the power increment Δ P is 50, the ozone production (hereinafter, denoted by OUT) OUT is changed from 11.5 to 16, and the ozone production increment Δ OUT1 is 5.5; when the active power changes from P-200 to P-250, Δ P is also 50, but Δ OUT2 is 1, which is much smaller than Δ OUT1, i.e., Δ OUT2< < Δ OUT1, and this characteristic is called saturation characteristic. In fact, the rate of change of the corresponding curve (derivative of output OUT with respect to active power) d (OUT)/dP, or the approximation Δ OUT/Δ P, is the efficiency of the ozone generator in terms of electrical energy utilization, the greater the efficiency of electrical energy utilization, the higher the ozone production per active power, in other words, the lower the electrical energy consumption at the same ozone production. For ease of description, Δ OUT/Δ P is defined below as the sensitivity, i.e., the sensitivity is: the ratio of the amount of change in ozone production to the amount of change in active power applied to the ozone generator over a predetermined period of time.
2) The curve of the correspondence between the ozone production of the ozone generator and the active power applied to the ozone generator is subject to various factors and dynamically changes in actual operation. Figure 7 shows the effect of different oxygen flow rates on ozone production. Not only does the ozone flow rate be involved, but many other factors can also affect the curve. In addition, the ozone production of the ozone generator and the active power applied to the ozone generator in each discharge tube region are not identical, but have a similar shape to that of fig. 7.
In summary, the ozone yield of the ozone generator and the active power applied to the ozone generator are plotted such that the sensitivity Δ OUT/Δ P approaches zero as the variable P increases, the sensitivity of different discharge tube regions is different for a given P, and the sensitivity at a given P point is changed as the operating condition of the ozone generator changes even in the same discharge tube regions.
The core idea of the control method of the high-power ozone generator power supply disclosed by the invention is that the efficiency is first, and the method specifically comprises the following steps: when the active power of the ozone generator needs to be increased, the area of the discharge tube with the highest sensitivity is selected to be increased, when the power needs to be reduced, the area of the discharge tube with the lowest sensitivity is selected to be reduced, and the rest power is kept unchanged.
For example, when the total output Σ Out of the ozone generator is smaller than the preset constraint OSetIn time, the ozone power supply increases the power output Δ P for application to the discharge tube region of greatest sensitivity, while the active power in the other discharge tube regions remains unchanged. When the total output sigma Out of the ozone generator is larger than a preset constraint condition OSetIn the meantime, the ozone power supply reduces the power output Δ P, which is reduced by selecting the discharge tube region with the smallest sensitivity, and the power of the other discharge tube regions is kept unchanged, i.e., the output power of the ozone power supply to the discharge tube region with the smallest sensitivity is reduced by Δ P. The power distribution of each discharge tube area is stable, and the power supply working point of each discharge tube area is the point with the maximum electric energy utilization rate of each discharge tube area aiming at the current operating condition, so that the electric energy utilization rate of the ozone generator on the whole layer is the highest, namely, the ozone generator is in the most energy-saving state, and the optimization purpose is achieved. Work in the middleIn the rate distribution process, only the current sensitivity of each discharge tube region needs to be calculated, and the objective function of each discharge tube region does not need to be obtained in advance. As long as the power increment Δ P is not excessively large, no large fluctuation in ozone production will occur during power adjustment, thereby making the entire search process stable and smooth.
The invention realizes the maximization of the integral electric energy utilization rate of the ozone generator based on two characteristics of the nonlinear saturation and the real-time dynamic change of the corresponding relation curve of the ozone yield and the active power applied to the ozone generator in the running process of the ozone generator.
It should also be noted that, in the present invention, the objective function is the ozone production Out of each ozone generation regioniAnd power P of each ozone generation regioniFunctional relationship of (a): outi＝fi(Pi) I.e. the curves shown in fig. 6, and these curves are however dynamically changing, i.e. different depending on the operating conditions and the condition of the ozone generator.
Referring to fig. 9, a schematic structural diagram of a control system of power supplies of a high-power ozone generator disclosed in an embodiment of of the invention includes N oxygen flowmeters 11, N ozone concentration meters 12, N power meters 13, N ozone power supplies 14, and upper computers 15, where N is a positive integer greater than 1, a value of N is determined by the size of the ozone generator and the number of discharge tubes, and is 2 to 4 in general.
Wherein:
each of the oxygen flowmeters 11 is installed at the air outlets of ozone generating regions of the ozone generator, and is used for collecting the oxygen flow at the corresponding air outlet.
The ozone generator is characterized in that a generating chamber of the ozone generator is divided into N ozone generating areas according to a preset area dividing principle, ozone discharge tubes in the ozone generating areas are electrically connected in parallel, the ozone generating areas are electrically insulated, air outlets of the ozone generating areas are independent, each ozone power supplies are only responsible for power supply of ozone generating areas, and the ozone power supplies are independent.
It should be noted that, in practical application, the main devices of each ozone power supply include a rectifier diode, a filter capacitor, an IGBT component, a high-frequency transformer, a high-frequency reactor, and the like, and reference may be made to the existing mature scheme specifically, which is not described herein again.
The air outlets of the ozone generating areas are independent of each other, so that the real-time ozone yield of each ozone generating area can be measured and calculated conveniently.
The preset region division principle may be: the temperature distribution is close, or the oxygen concentration is close, so as to facilitate the electrical connection of the ozone discharge tube, etc., which depends on the actual requirement, and the invention is not limited herein.
For example, fig. 10(a), 10(b) and 10(c) show three ozone generation regions, each of which is a division of the generation chamber of the ozone generator into 3 ozone generation regions, respectively: region 1, region 2 and region 3.
Each of the ozone concentration meters 12 is installed on the air outlets of the ozone generation regions of the ozone generator, and is used for collecting the ozone concentration at the corresponding air outlet.
Each of the power meters 13 is mounted on of the ozone power supplies 14, and is used for reading the output power of the corresponding ozone power supply 14.
The upper computer 15 is respectively connected with each oxygen flow meter 11, each ozone concentration meter 12, each power meter 13 and each ozone power supply 14, the upper computer 15 is used for collecting the output power of each ozone power supply 14, the oxygen flow and the ozone concentration at the air outlet of each ozone generation area, the ozone yield of each ozone generation area is obtained according to the oxygen flow and the ozone concentration of ozone generation areas, when the ozone generator starts to work, the power of each ozone generation area is set to be the maximum allowable power of the ozone generation area, the initial ozone yield of each ozone generation area is obtained, the initial actual ozone yield of each ozone generation area is obtained by adding the initial ozone yields of the ozone generation areas, the initial actual ozone yield of the ozone generator is obtained by calculating, whether the initial actual total ozone yield is smaller than the preset total ozone yield of a or not is judged, the preset ozone yield of a is the difference between the target total ozone yield and the allowable error, the allowable error is the difference between the actual total ozone yield and the target total ozone generation output power, if the initial total ozone generation power of each ozone generation area is smaller than the target total yield of the corresponding ozone generation area, the current total yield of the ozone generation area is obtained by adding the corresponding to the maximum allowable ozone generation power of the ozone generation area, if the current total ozone generation area and the target total ozone generation area, the current total yield of the corresponding to the target total yield of the corresponding to the total ozone generation area is obtained by adding the power of the corresponding to the total ozone generation area, if the total ozone generation area is smaller area, if the power of the corresponding area, if the power of the corresponding area, the corresponding area is smaller area, if the corresponding area, the corresponding area is judged if the corresponding area.
It should be noted that, in the present invention, the N oxygen flow meters 11, the N ozone concentration meters 12, the N power meters 13, the N ozone power supplies 14, and the upper computers 15 form control networks.
Optionally, the ozone power supply 14 is connected to the upper computer 15 via an ethernet or RS-485 serial port.
The upper computer 15 may be an industrial PC or a PLC (Programmable logic controller) with powerful computing capability.
The signals output by the oxygen flowmeter 11, the ozone concentration meter 12 and the power meter 13 to the upper computer 15 can be analog (such as 4-20mA signals) or digital (such as MODBUS communication protocol).
In summary, the control system of the power supply of the high-power ozone generator comprises N oxygen flowmeters, N ozone concentration meters, N power meters, N ozone power supplies and upper computers, wherein the upper computers acquire oxygen flow at an air outlet of an ozone generation area acquired by the oxygen flowmeters, ozone concentration of the ozone generation area acquired by the ozone concentration meters and output power of the corresponding ozone power supplies read by the power meters, ozone yield of the ozone generation area is obtained according to the oxygen flow and the ozone concentration of the same ozone generation areas, initial ozone yield of each ozone generation area is added to obtain initial actual total ozone yield of the ozone generator, when the initial actual total ozone yield is not less than preset yield, the power of each ozone generation area is set to be a difference value between the current power and a power adjustment step length, when the ozone generator works for a preset time period, the obtained current actual total yield of each ozone generation area is added to obtain current actual total ozone yield of the ozone generator, the sensitivity of each generation area is adjusted to calculate the sensitivity of each ozone generation area, the sensitivity of the ozone generation area is adjusted to be equal to , if the current total ozone generation power of the power generation area is lower than the corresponding power of the power generation area, the power of the power generation area, if the power of the power generation area is lower than the power of the power generation area, the power of the power generation area is set to be lower power generation area, the power of the power generation area, if the power generation area is set to be lower power generation area, the power of the power generation area, the area is set to be lower power of the area, the area is set to be lower power of the power of.
In addition, in the whole power regulation process, the corresponding relation curve of the ozone yield of the ozone generation area and the active power applied to the ozone generation area is not considered, the position of the regulated power point on the curve is not considered, the whole process is regulated according to the curve change rate of the current power point accessory, and the dynamic regulation is also carried out, so that the automatic regulation of the power supply of the high-power ozone generator can be realized according to the difference of the power point and/or the change of the curve.
It should be noted that, under normal conditions, the upper computer 15 exchanges data with each ozone power supply 14 through the ethernet in real time to control each ozone power supply 14, when the upper computer 15 fails or when communications between a certain ozone power supplies 14 and the upper computer 15 are lost, each ozone power supply 14 is separated from the network control to operate independently, so as to ensure the normal operation of the ozone generator, but the optimal control of each ozone power supply 14 cannot be performed at this time.
To facilitate an understanding of the process of the present invention for optimizing control of various ozone power supplies , specific examples are provided as follows:
suppose that the generation chamber of the ozone generator is divided into 3 ozone generation zones, i.e., N is 3, and ozone power supplies supply power to each ozone generation zones.
The ozone output of each ozone generation area is Out1，Out2，Out3。
The actual total ozone production Σ Out ═ Out for the three ozone generating regions1+Out2+Out3。
The power of each ozone generation area is as follows: pi，i＝1，2，3。
The maximum allowable power of each ozone power supply is Pmaxi，i＝1，2，3。
The minimum allowable power of each ozone power supply is Pmini,i＝1，2，3。
OSetThe target ozone production.
Epsilon is the allowable error of the actual total ozone production and the target total ozone production.
And delta P is a power adjustment step size, namely the variation of active power applied to the ozone generator.
Δ T is the delay time.
The sensitivity of each ozone generation zone is defined as: Δ Outi/ΔP，i＝1，2，3，ΔOutiThe ozone production variation amount of the i-th ozone generation area in a preset time period.
When the ozone generator starts to be put into operation, the upper computer sends a command to determine the total target ozone production OSetAnd the power output of each ozone power supply is set at the maximum allowable power Pmax of each ozone power supplyiAnd the operation is full power.
In actual operation, -specified error is allowed between the target total ozone production (set point) and the actual ozone production for the convenience of control and the stability of the control of the ozone power supply.
If the actual total ozone production sigma Out of three ozone generating areas is less than OSetEpsilon, this indicates that the ozone production is not reached at full power, in which case the control optimization is not possible and the system (as whole ozone generator, the same applies hereinafter) is kept running at full power. Otherwise, entering a sensitivity calculation initialization link.
Sensitivity calculation is carried Out, and delta Out needs to be calculated firstlyi(i ═ 1,2,3), ozone production Out0 before power changei(i ═ 1,2,3) and ozone production after power change Out1iAnd the difference Δ Out thereofi＝Out1i-Out0iAnd Δ P.
The method adopted by the invention is as follows: when the ozone generator is powered on and put into operation, Pi＝Pmaxi(i ═ 1,2,3), and when the ozone generator was stable in operation, the ozone production Out0 in each ozone generation area was recordedi. Then Pi＝PiΔ P, ozone production Out1 for each ozone generation zone after power change was recorded after ozone production stabilizediThen, Δ Out is obtainedi＝Out1i–Out0iThus, the sensitivity Δ Out can be calculatediAnd/Δ P. Taking the method as a starting point, after the power delta P is adjusted each time, the output after power adjustment is recorded Out1 through time delay delta TiAnd go Out1 timesiValue of to Out0iThen, Δ Out can be foundi＝Out1i–Out0iCalculate the sensitivity at steps without additionally changing the power, the power change is smoothed throughout the optimization process, and then calculate the sensitivity Δ Out for each ozone generating zoneiWhere it is desired to specify for Δ P, Δ P is defined as the power adjustment step size, which is the amount of power change per adjustment.
If the current power of a certain ozone generation area is Px and the power is changed to Py after the change, Δ P is Py-Px, i.e., the difference between the changed power and the power before the change is defined as Δ P. If Py > Px, Δ P >0, and if Py < Px, Δ P < 0. That is, the power change is increased if Δ P >0 and decreased if Δ P < 0.
The specific value of Δ P is very sensitive, and is related to the accuracy of control and the stability of system control, and should be determined according to specific conditions, even continuously adjusted according to the operating condition of the system.
After the current sensitivity of each ozone generation area is obtained, the judgment and the regulation are started:
if the current actual total ozone production sigma out>(OSet+ epsilon), the output power of the ozone power supply corresponding to the zone of ozone generation with the least control sensitivity is reduced by power delta P, while the power of the rest zones is not changed, before power reduction, an out-of-limits judgment is carried out<Pmin, then P equals Pmin; conversely, P ═ P- Δ P. Here, P represents the pre-regulation power of the ozone generation region having the smallest sensitivity, and Pmin represents the minimum allowable power of the ozone generation region.
If the current actual total ozone production sigma Out<(OSetEpsilon), the output power of the ozone power supply corresponding to the ozone generating area with the highest sensitivity is controlled to be increased by power delta P, and the power of the rest areas is not changed. Similarly, an out-of-range determination is also made: if P + Δ P>Pmax, then P is Pmax; conversely, P ═ P + Δ P. Here, P represents the pre-regulation power of the ozone generation region having the greatest sensitivity, and Pmax represents the maximum allowable power of the region.
If Σ Out falls within region [ O ]Set–ε,OSet+ε]I,, i ∑ Out-OSet│<Epsilon, then the power of all ozone generating areas is not adjusted and is kept unchanged, the program does not go down, and the program jumps back to the judgment entrance.
After the judgment and the adjustment are finished, time periods of time delta T are needed, from the perspective of a control theory, the ozone generator is lag systems, the power parameter needs time periods of time for the ozone output to be stabilized again after being changed, different systems have different time periods for the output to be stabilized again after the power is changed, and therefore the delta T parameter is determined according to the specific ozone system.
After a sufficient delay, sensitivity calculation, judgment, adjustment and cycle are carried out again, is carried out until the system is stable in a certain state, the actual total ozone yield and the target yield are kept within the set error, and the power point of each zone is the point with the maximum obtainable sensitivity, which means that the power distribution of the system reaches the state with the best efficiency, namely, the target to be obtained is optimized.
The algorithm is very compact and adjusts the power point of each zone according to the sensitivity (i.e. the rate of change of production to power) near the power point of each zone, i.e. the point with high sensitivity (meaning more efficient in electrical energy) distributes more power (increases Δ P) and conversely the point with low sensitivity (meaning less efficient in electrical energy) cuts down its power (decreases Δ P). the algorithm does not specify which ozone generation zone's corresponding curve of ozone production to active power applied to the ozone generation zone, nor does it specify in which segment of the curve, is adjusted according to the rate of change of the curve (i.e. the derivative value of the point) near the current power point, and thus is dynamically adjusted, automatically as the power point changes and/or the curve changes.
It is well known that classical optimization designs require knowledge of the objective function, otherwise it is impossible to calculate, in this example, the objective function is the function of the relationship between the ozone production of each zone and the active power applied to the zone, and as previously described, it is dynamically changing in real time and difficult to computationally derive analytical expressions, and thus classical optimization methods cannot be directly applied here, whereas the algorithm described in this example circumvents this difficulty, searching the optimal operating point of each curve by calculating the rate of change around the power point.
As mentioned above, the idea of the present invention is based on the saturation characteristic of the ozone production-power curve and the dynamic variation of this curve in each ozone generation zone, both of which are finally reflected in the rate of change of the curve (i.e. the derivative, i.e. the sensitivity we define), thus grasping the concept of sensitivity and taking it as a starting point, using the principle of "efficiency first": the idea of the present invention is that the power is distributed more with high sensitivity (i.e. the power utilization efficiency is high), while the power is reduced with low efficiency, so that the power is continuously and gradually adjusted to reach the optimal state.
For those skilled in the art who are skilled in the optimization algorithm and have a strong understanding of the principle of operation and operation of the ozone generator, it is not difficult to provide an improved and/or extended algorithm based on the algorithm described in this example according to the above inventive concept.
Corresponding to the system embodiment, the invention also discloses a control method of high-power ozone generator power supplies.
Referring to fig. 11, a flow chart of a control method of high-power ozone generator power supplies disclosed by the embodiment of the invention is applied to a control system shown in fig. 9, and the control method comprises the following steps:
step S101, when the ozone generator starts to work, setting the power of each ozone generation area as the maximum allowable power of the ozone generation area;
step S102, obtaining initial ozone output of each ozone generation area, adding the initial ozone output of each ozone generation area, and calculating to obtain initial actual total ozone output of the ozone generator;
step S103, judging whether the initial actual total ozone yield is smaller than th preset total ozone yield, if not, executing step S104, and if so, returning to execute step S101;
the preset total ozone yield is the difference between the target total ozone yield and the allowable error, and the allowable error is the actual total ozone yield and the target total ozone yield.
Step S104, setting the power of each ozone generation area as the difference value between the current power and the power adjustment step length;
step S105, after the ozone generator works for a preset time period, obtaining the current ozone output of each ozone generation area, adding the current ozone outputs of the ozone generation areas, and calculating to obtain the current actual total ozone output of the ozone generator;
step S106, calculating the sensitivity of each ozone generation area;
the sensitivity is the quotient of the yield difference and the power adjustment step length of the same ozone generation area in the preset time period, and the yield difference is the yield difference between the current ozone yield and the initial ozone yield of the same ozone generation area.
Step S107, judging whether the current actual total ozone yield is greater than a second preset total ozone yield, if so, executing step S108, and if not, executing step S109;
the second preset total ozone yield is as follows: the sum of the total target ozone production and the tolerance.
Step S108, controlling the output power of the ozone power supply corresponding to the ozone generation area with the minimum sensitivity to be reduced;
when the output power of the ozone power supply corresponding to the ozone generation region having the smallest control sensitivity is decreased by the power adjustment step, the power of the remaining ozone generation regions is kept constant.
In practical applications, step S108 may specifically include:
judging whether the difference value between the output power of the ozone power supply corresponding to the ozone generation area with the minimum sensitivity and the power adjustment step length is smaller than the minimum allowable power of the ozone power supply corresponding to the ozone generation area with the minimum sensitivity;
if so, controlling the output power of the ozone power supply corresponding to the ozone generation area with the minimum sensitivity to be reduced to the minimum allowable power;
and if not, controlling the output power of the ozone power supply corresponding to the ozone generation area with the minimum sensitivity to reduce the power adjustment step length.
Step S109, the output power of the ozone power supply corresponding to the ozone generation area with the highest control sensitivity is increased.
When the output power of the ozone power supply corresponding to the ozone generation region having the highest control sensitivity is increased by the power adjustment step, the power of the remaining ozone generation regions is kept constant.
In practical applications, step S109 may specifically include:
judging whether the difference value between the output power of the ozone power supply corresponding to the ozone generation area with the maximum sensitivity and the power adjustment step length is larger than the maximum allowable power of the ozone power supply corresponding to the ozone generation area with the maximum sensitivity;
if yes, controlling the output power of the ozone power supply corresponding to the ozone generation area with the maximum sensitivity to be increased to the maximum allowable power;
and if not, controlling the output power of the ozone power supply corresponding to the ozone generation area with the maximum sensitivity to increase the power adjustment step length.
In summary, the control method of the power supply of the high-power ozone generator disclosed by the invention comprises the steps of acquiring the oxygen flow at the air outlet of an ozone generation area acquired by an oxygen flow meter, acquiring the ozone concentration of the ozone generation area acquired by an ozone concentration meter, reading the output power of the corresponding ozone power supply by a power meter, obtaining the ozone output of the ozone generation area according to the oxygen flow and the ozone concentration of the same ozone generation areas, adding the obtained initial ozone outputs of the ozone generation areas to calculate the initial actual total ozone output of the ozone generator, setting the power of each ozone generation area as the difference between the current power and the power adjustment step length when the initial actual total ozone output is not less than th preset ozone output, adding the obtained current actual ozone outputs of the ozone generation areas after the ozone generator works for a preset time period, calculating the current actual ozone output of the ozone generator, calculating the sensitivity of each ozone generation area, judging whether the quotient of the current actual total ozone generation area and the power adjustment of the current ozone generation area is greater than the current actual total ozone generation area and judging whether the sensitivity of the ozone generation area is greater than the second preset ozone generation area, if the sensitivity of the ozone generation area is greater than the maximum power of the power adjustment of the power generation area, and controlling the power of the power generation area corresponding to the power output of the power generation area, if the power of the power generation area, and the power generation area corresponding ozone generation area, and if the power output of the power generation area is greater than the power output of the power generation area, and the power output power of the power generation area, otherwise, and if the power generation area, which is greater than the power of the power generation area.
In addition, in the whole power regulation process, the corresponding relation curve of the ozone yield of the ozone generation area and the active power applied to the ozone generation area is not considered, the position of the regulated power point on the curve is not considered, the whole process is regulated according to the curve change rate of the current power point accessory, and the dynamic regulation is also carried out, so that the automatic regulation of the power supply of the high-power ozone generator can be realized according to the difference of the power point and/or the change of the curve.
To further optimize the above embodiment, before executing step S109, the method may further include:
judging whether the current actual total ozone yield is less than the th preset total ozone yield or not;
if yes, go to step S109;
if not, the step S105 is executed in a returning way.
From the control theory point of view, the ozone generator is lagging systems, and time is needed for the ozone output to be stable again after the power parameter is changed, different systems have different times for the output to be stable again after the power is changed, so the parameter delta T is determined according to the specific ozone system.
It can be understood that the control process of the power supply of the high-power ozone generator is real-time dynamic control processes, and therefore, after times of control of the power supply of the high-power ozone generator is completed by using the embodiment shown in fig. 11, the control method may further include:
and after the preset delay time, taking the current ozone output of each ozone generation area as the initial ozone output, returning to the step S105, and after the ozone generator works for the preset time period, continuously acquiring the ozone output of each ozone generation area so as to control the ozone power supply.
It should be noted that, the control method to be protected by the present invention can be expressed as:
suppose that the ozone generator generation chamber is divided into n ozone generation areas, which are respectively powered by n ozone power supplies.
The ozone production of each ozone generation area is respectively as follows: out1，Out2，…，Outn。
Actual total ozone production ∑ Out ═ Out1+Out2+…+Outn。
The power of each ozone generation area is as follows: p1，P2，…，Pn。
The maximum allowable output power of each ozone power supply is Pmax1，Pmax2，…，Pmaxn。
The minimum allowable output power of each ozone power supply is Pmin1，Pmin2，…，Pminn。
OSetThe target ozone production.
Epsilon is the allowable error of the actual total ozone production and the target total ozone production.
And delta P is a power adjustment step size, namely the variation of active power applied to the ozone generator.
Δ T is the delay time.
The sensitivity of the ith ozone generation zone is defined as: Δ Outi/ΔP，i＝1，2,，…，n。
Wherein epsilon, delta P and delta T are related to factors such as rated output of the ozone generator, performance of the ozone power supply, technical process of ozone application and the like, and need to be determined according to specific conditions.
When the ozone generator starts to be put into operation, the target ozone yield OSetIs not greater than the rated output of the ozone generator.
The system operates in a full power state: p1＝Pmax1，P2＝Pmax2，…，Pn＝Pmaxn. Recording the yield Out0 of each area after the yield is stableiAnd (i ═ 1,2, …, n), and calculates Σ Out.
If Σ Out<(OSetEpsilon), the optimization is finished, and the system is kept in the full power state. On the contrary, the power of each ozone generation area is reduced by the step length delta P, and after enough time delay, the output Out1 after the power of each ozone generation area is changed is recordedi(i ═ 1,2, …, n), and calculates Σ Out. At this time, Δ Out may also be obtainedi＝Out1i-Out0i。
Next, the current sensitivity of each ozone generation region was calculated: Δ OutiAnd/Δ P, (i ═ 1,2, …, n). To find out each odorAfter the current sensitivity of the oxygen generation area, the judgment and power adjustment are started, specifically as follows:
if the total ozone production sigma Out>(OSet+ epsilon), the power of the ozone generating region with the least sensitivity is reduced by deltap, while the power of the remaining ozone generating regions is not changed. And when the power is reduced, carrying out-of-range judgment:
if P-delta P < Pmin, then P is Pmin, otherwise P is P-delta P, P is the power before regulation of the ozone generation region with the minimum sensitivity, and Pmin is the minimum allowable power of the power supply corresponding to the ozone generation region.
If the total ozone production sigma Out<(OSetε), the power Δ P is increased for the ozone generating region with the greatest sensitivity, while the power is unchanged for the remaining ozone generating regions. And when the power is increased, carrying out-of-range judgment:
if P + delta P > Pmax, then P is Pmax, otherwise P is P + delta P, P is the power before regulation of the ozone generating region with the maximum sensitivity, and Pmax is the maximum allowable power of the power supply corresponding to the ozone generating region.
If Σ Out falls within region [ O ]Set–ε,OSet+ε]I.e., | Out-OSet│<Epsilon, power of all ozone generating zones is not adjusted and remains unchanged, and the program returns and re-records real-time ozone production Out1 for each zoneiThen, the sensitivity of Σ Out and each ozone generation region is recalculated and judged.
After power adjustment, the time is delayed by delta T, Out1 at this timeiValue assignment to Out0iRefresh Out0iThen rounds again, recording power adjusted yield Out1iCalculating sigma Out, calculating sensitivity, judging and adjusting power. And so on continuously. In this process, the operating point P of each ozone generation regioniGradually moving towards the optimum power point. Finally, satisfy ∑ Out-OSet│<And epsilon, the power distribution of each area reaches the optimal state of efficiency, namely, the optimization target is reached.
It should be noted that the three parameters of epsilon, delta P and delta T in the present invention are not fixed , and some or all of them may be dynamically changed according to the change of the working condition in the actual optimization control.
The invention is based on the two bases that the yield-power function curve of the ozone generator has saturation characteristic and the curves of all the subareas are different and are dynamically changed. Therefore, the sensitivity (i.e. the change rate or derivative of the production to the power) of each power point on the curve is dynamically changed, the electric energy efficiency of the working points with the highest sensitivity is highest, and the sensitivity of each working point is compared through calculation, the power of the points with high efficiency is distributed more, the power of the points with low efficiency is reduced, and the possible optimal working point is searched according to the principle. As long as the step length delta P, the delay delta T and the target error epsilon are properly selected, the system can automatically and smoothly search, and finally the system is stabilized in the state with the optimal overall electric energy efficiency.
Finally, it should also be noted that, in this document, relational terms such as , second, and the like are only used to distinguish entities or operations from another entities or operations, without necessarily requiring or implying any actual relationship or order between such entities or operations, furthermore, the terms "comprise", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises the series of elements does not include only those elements but also other elements not expressly listed or inherent to such process, method, article, or apparatus.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention.

Claims (7)

  1. The control system of power supplies of high-power ozone generators is characterized by comprising N oxygen flowmeters, N ozone concentration meters, N power meters, N ozone power supplies and upper computers, wherein N is a positive integer greater than 1;
    each oxygen flowmeter is arranged on the air outlets of ozone generation areas of the ozone generator and is used for collecting the oxygen flow at the corresponding air outlet, wherein a generation chamber of the ozone generator is divided into N ozone generation areas according to a preset area division principle, ozone discharge tubes in the ozone generation areas are electrically connected in parallel, the ozone generation areas are electrically insulated, the air outlets of the ozone generation areas are independent, each ozone power supplies are only responsible for supplying power to ozone generation areas, and the ozone power supplies are independent;
    each ozone concentration meter is arranged on the air outlets of ozone generating areas of the ozone generator and is used for collecting the ozone concentration at the corresponding air outlet;
    each power meter is arranged on ozone power supplies and is used for reading the output power of the corresponding ozone power supply;
    the upper computer is respectively connected with each oxygen flow meter, each ozone concentration instrument, each power meter and each ozone power supply, and is used for acquiring the output power of each ozone power supply, the oxygen flow and the ozone concentration at the air outlet of each ozone generation area, obtaining the ozone yield of each ozone generation area according to the oxygen flow and the ozone concentration of ozone generation areas, when the ozone generator starts to work, setting the power of each ozone generation area as the maximum allowable power of the ozone generation area, obtaining the initial ozone yield of each ozone generation area, adding the initial ozone yields of the ozone generation areas, calculating the initial actual total ozone yield of the ozone generator, judging whether the initial actual total ozone yield is smaller than the preset total ozone yield of a , setting the preset total ozone yield of a as the difference between the target total ozone yield and the allowable error, setting the allowable error as the difference between the actual total yield and the target total ozone yield, if the power of each ozone generation area is smaller than the preset total ozone generation power, and calculating the target total ozone generation power of the current total ozone generation area if the current total ozone generation power is smaller than the preset total ozone generation power, and the target ozone generation area, and calculating the current total ozone generation power of the current total yield of the corresponding to obtain the corresponding to the target total ozone generation power of the ozone generation area, and calculating the current total yield of the corresponding to obtain the current total ozone generation power of the ozone generation area if the power of the ozone generator, and the power of the power meter and the power meter, and the power of the power meter, if the power of the power meter are smaller than the power meter.
  2. 2. The control system of claim 1, wherein the ozone power source is connected to the upper computer via an ethernet or RS-485 serial port.
  3. The control method of power supply of high-power ozone generator of , wherein the control method is applied to the upper computer in the control system of claim 1, the control method includes:
    when the ozone generator starts to work, setting the power of each ozone generation area as the maximum allowable power of the ozone generation area;
    acquiring initial ozone yield of each ozone generation area, adding the initial ozone yields of the ozone generation areas, and calculating to obtain initial actual total ozone yield of the ozone generator;
    judging whether the initial total actual ozone yield is less than th preset total ozone yield, wherein the th preset total ozone yield is the difference between the target total ozone yield and an allowable error, and the allowable error is the allowable error between the actual total ozone yield and the target total ozone yield;
    if not, setting the power of each ozone generation area as the difference value between the current power and the power adjustment step length;
    after the ozone generator works for a preset time period, acquiring the current ozone output of each ozone generation area, adding the current ozone outputs of the ozone generation areas, and calculating to obtain the current actual total ozone output of the ozone generator;
    calculating the sensitivity of each ozone generation area, wherein the sensitivity is the quotient of the yield difference and the power adjustment step length of the same ozone generation area in the preset time period, and the yield difference is the yield difference between the current ozone yield and the initial ozone yield of the same ozone generation area;
    judging whether the current actual total ozone output is greater than a second preset total ozone output, wherein the second preset total ozone output is as follows: the sum of the total target ozone production and the tolerance;
    if so, reducing the output power of the ozone power supply corresponding to the ozone generation area with the minimum control sensitivity;
    if not, the output power of the ozone power supply corresponding to the ozone generation area with the highest control sensitivity is increased.
  4. 4. The control method according to claim 3, wherein the output power of the ozone power supply corresponding to the ozone generation region with the minimum control sensitivity is reduced, and specifically comprises:
    judging whether the difference value between the output power of the ozone power supply corresponding to the ozone generation area with the minimum sensitivity and the power adjustment step length is smaller than the minimum allowable power of the ozone power supply corresponding to the ozone generation area with the minimum sensitivity;
    if so, controlling the output power of the ozone power supply corresponding to the ozone generation area with the minimum sensitivity to be reduced to the minimum allowable power;
    and if not, controlling the output power of the ozone power supply corresponding to the ozone generation area with the minimum sensitivity to reduce the power adjustment step length.
  5. 5. The control method according to claim 3, wherein the controlling of the output power increase of the ozone power supply corresponding to the ozone generating region with the highest sensitivity specifically comprises:
    judging whether the difference value between the output power of the ozone power supply corresponding to the ozone generation area with the maximum sensitivity and the power adjustment step length is larger than the maximum allowable power of the ozone power supply corresponding to the ozone generation area with the maximum sensitivity;
    if yes, controlling the output power of the ozone power supply corresponding to the ozone generation area with the maximum sensitivity to be increased to the maximum allowable power;
    and if not, controlling the output power of the ozone power supply corresponding to the ozone generation area with the maximum sensitivity to increase the power adjustment step length.
  6. 6. The control method according to claim 3, further comprising, before the output power of the ozone power supply corresponding to the ozone generation region having the highest control sensitivity is increased:
    judging whether the current actual total ozone yield is less than the th preset total ozone yield or not;
    if so, controlling the output power of the ozone power supply corresponding to the ozone generation area with the highest sensitivity to be increased;
    if not, returning to the step, after the ozone generator works for a preset time period, obtaining the current ozone output of each ozone generation area, adding the current ozone outputs of the ozone generation areas, and calculating to obtain the current actual total ozone output of the ozone generator.
  7. 7. The control method according to claim 3, characterized by further comprising:
    and after the preset delay time, taking the current ozone output of each ozone generation area as the initial ozone output, returning to the execution step, and after the ozone generator works for the preset time period, continuously acquiring the ozone output of each ozone generation area so as to control the ozone power supply.
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