CN110734041B

CN110734041B - Control system and control method for power supply of high-power ozone generator

Info

Publication number: CN110734041B
Application number: CN201911044662.8A
Authority: CN
Inventors: 陈纪援; 陈少梅; 刘高斌; 张原�; 林春源; 王建春
Original assignee: LONJING ENVIRONMENT TECHNOLOGY CO LTD
Current assignee: LONJING ENVIRONMENT TECHNOLOGY CO LTD
Priority date: 2019-10-30
Filing date: 2019-10-30
Publication date: 2021-08-10
Anticipated expiration: 2039-10-30
Also published as: CN110734041A

Abstract

The invention discloses a control system and a control method of a high-power ozone generator power supply, wherein the system comprises the following steps: n oxygen flowmeter, N ozone concentration appearance, N dynamometer, N ozone power and a host computer, the host computer acquires the oxygen flow and the ozone concentration of regional gas outlet department of ozone emergence to and the output of ozone power. The invention adjusts the power of each ozone generation area according to the sensitivity near the power point of each ozone generation area, more power is distributed to the point with high sensitivity (meaning higher electric energy efficiency), on the contrary, the power is reduced to the point with low sensitivity (meaning lower electric energy efficiency), that is, the invention correspondingly adjusts the power of the ozone power supply corresponding to the ozone generation area according to the different electric energy utilization rates of the ozone discharge tubes in the ozone generation area, thereby improving the whole electric energy utilization rate of the ozone generator, reducing the operation cost and realizing energy conservation and consumption reduction.

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 method for a power supply of a high-power ozone generator.

Background

An ozone generator generally refers to a device for generating ozone from oxygen or air by dielectric barrier discharge, which uses an alternating high-voltage electric field to generate corona discharge from oxygen-containing gas, and high-energy free electrons in the corona ionize oxygen molecules and polymerize some of the molecules into ozone molecules. 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 that the aim of controlling the ozone output of the discharge tube is fulfilled.

The power supply mode of the ozone generator is generally two types: 1) a single power supply supplies power (see fig. 1), namely all ozone discharge tubes of the ozone generator are electrically connected in parallel and are uniformly supplied with power by one ozone power supply; 2) the ozone discharge tube of the ozone generator is divided into a plurality of parts by multi-power supply (see figure 2); each part of the ozone discharge tubes are electrically connected in parallel to form an independent electric unit, and each electric unit adopts an ozone power supply to supply power. Wherein, each independent electric unit corresponds an ozone power, and each ozone power does not rely on other power independent workings.

The single power supply mode has the advantages that: the electric structure is simple, the control is relatively simple, the occupied area is small, the cost is low, but the following defects and technical difficulties exist:

1. there is a bottleneck in manufacturing high-power high-frequency alternating current power supply. Specifically, when the ozone generator produces several hundred kilograms of ozone per hour and the electric power of the ozone generator reaches the 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), and the IGBT device is limited by the performance, and is very difficult to design and manufacture, even impossible to realize. At present, a single power supply product based on an IGBT module at the level of 2MW exists in China, but the working frequency of the power supply product can only reach hundreds of hertz, and the power supply product is not called as high frequency.

2. Affecting the operational reliability of the ozone generator. As hundreds of ozone discharge tubes are electrically connected in parallel in a single power supply mode, if the electrical gap of one or more ozone discharge tubes becomes small or insulation breakdown occurs, the voltage of all the ozone discharge tubes cannot be increased, which restricts the ozone yield and greatly affects the working reliability of the ozone generator.

3. The electric energy cannot be effectively utilized to the maximum extent. Although each ozone discharge tube has the same design, theoretically, the equivalent electrical parameters of each ozone discharge tube are the same. However, due to manufacturing tolerances, uneven distribution and dynamic changes of parameters such as gas and temperature, these electrical parameters may deviate, resulting in different electrical energy utilization efficiency of each ozone discharge tube. Since all ozone discharge tubes of a single-power-supply ozone generator are electrically connected in parallel, an optimal control means cannot be adopted to adjust and excavate the electric energy utilization efficiency of specific parts or local ozone discharge tubes, and as a result, more electric energy is consumed under the same ozone yield.

Although the multi-power supply system can solve the above problems of the single power supply system, in practical applications, the conditions of each ozone discharge tube are not completely the same, and from the viewpoint of the power utilization rate (i.e. the rate of change of ozone output to consumed power), not only the power utilization rate of each ozone discharge tube is different, but also the power utilization rate is dynamically changed. However, in the conventional multi-power supply system, the voltage of the ozone power supply corresponding to each electrical unit is the same, and therefore, the overall power utilization rate of the ozone generator is not high for the ozone generator composed of the ozone discharge tube.

Disclosure of Invention

In view of the above, the present invention discloses a control system and a control method for a power supply of a high-power ozone generator, so as to correspondingly adjust the power of an ozone power supply corresponding to an ozone generation region according to the difference of the electrical energy utilization rate of an ozone discharge tube in the ozone generation region, thereby improving the overall electrical energy utilization rate of the ozone generator, reducing the operation cost, and realizing energy saving and consumption reduction.

A control system for a high power ozone generator power supply comprising: n oxygen flowmeters, N ozone concentration meters, N power meters, N ozone power supplies and an upper computer, wherein N is a positive integer greater than 1;

each oxygen flowmeter is arranged on an air outlet of one ozone generation area 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 supply is only responsible for supplying power to one ozone generation area, and the ozone power supplies are independent;

each ozone concentration meter is arranged on an air outlet of one ozone generation area of the ozone generator and is used for collecting the ozone concentration at the corresponding air outlet;

each power meter is arranged on one ozone power supply and used for reading the output power of the corresponding ozone power supply;

the upper computer is respectively connected with each oxygen flowmeter, each ozone concentration meter, 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 and obtaining the ozone output of the ozone generation area according to the oxygen flow and the ozone concentration of the same ozone generation area; 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 actual total ozone yield is less than a first preset total ozone yield, wherein the first preset total ozone yield is as follows: the difference between the target total ozone production and the allowable error is: (ii) an allowable error of the total actual ozone production and the target total ozone production; 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 as follows: the quotient of the yield difference and the power adjustment step length of the same ozone generation area in the preset time period is as follows: a difference between the current ozone production and the initial ozone production for the same ozone generation zone; 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 ozone power supply is connected with the upper computer through an ethernet or an RS-485 serial port.

A control method of a high-power ozone generator power supply, which is applied to an upper computer in the control system of claim 1, and comprises the following steps:

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 actual total ozone yield is less than a first preset total ozone yield, wherein the first preset total ozone yield is as follows: the difference between the target total ozone production and the allowable error is: (ii) an allowable error of the total actual ozone production and the target total ozone production;

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 as follows: the quotient of the yield difference and the power adjustment step length of the same ozone generation area in the preset time period is as follows: a difference between the current ozone production and the initial ozone production for the same ozone generation zone;

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 first 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.

From the technical scheme, the invention discloses a control system and a control method of a power supply of a high-power ozone generator, which comprises the following steps: the ozone generating system comprises N oxygen flowmeters, N ozone concentration meters, N power meters, N ozone power supplies and an upper computer, wherein the upper computer acquires the oxygen flow at the air outlet of an ozone generating area collected by the oxygen flowmeters, the ozone concentration of the ozone generating area collected by the ozone concentration meters and the output power of the corresponding ozone power supplies read by the power meters, and the ozone output of the ozone generating area is obtained according to the oxygen flow and the ozone concentration of the same ozone generating area; adding the obtained initial ozone output of each ozone generation area, calculating to obtain the initial actual total ozone output of the ozone generator, when the initial actual total ozone output is not less than the first preset total ozone output, 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, adding the obtained current ozone output of each ozone generation area, 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 as follows: the quotient of the yield difference value and the power adjustment step length of the same ozone generation area in a preset time period is used for judging whether the current actual total ozone yield is greater than a second preset total ozone yield or not, and if so, the output power of the ozone power supply corresponding to the ozone generation area with the minimum control sensitivity is reduced; if not, the output power of the ozone power supply corresponding to the ozone generation area with the highest control sensitivity is increased. The invention adjusts the power of each ozone generation area according to the sensitivity near the power point of each ozone generation area, more power is distributed to the point with high sensitivity (meaning higher electric energy efficiency), on the contrary, the power is reduced to the point with low sensitivity (meaning lower electric energy efficiency), that is, the invention correspondingly adjusts the power of the ozone power supply corresponding to the ozone generation area according to the different electric energy utilization rates of the ozone discharge tubes in the ozone generation area, thereby improving the whole electric energy utilization rate of the ozone generator, reducing the operation cost and realizing energy conservation and consumption reduction.

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 a single power supply mode 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 for a power supply of a high power ozone generator according to an embodiment of the present invention;

FIG. 10(a) is a schematic diagram of the manner in which an ozone generating region is divided according to an embodiment of the present invention;

FIG. 10(b) is a schematic diagram of another ozone generation region division disclosed in an embodiment of the present invention;

FIG. 10(c) is a schematic view of another embodiment of the present invention showing the ozone generating region being divided;

fig. 11 is a flow chart of a control method of a power supply of a high-power ozone generator according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

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, Dielectric Barrier Discharge (DBD) is the main method for industrial production of ozone in practical engineering at home and abroad. Referring to the schematic diagram of the mechanism of dielectric barrier discharge ozone generation shown in fig. 3, a DBD is a gas discharge with an insulating dielectric inserted in the discharge space. The mechanism of the DBD type ozone generator for generating ozone is as follows: an electric field is formed between the insulating medium and the discharge air gap by applying alternating voltage on the electrodes, the intensity of the electric field is high due to the narrow discharge air gap, when oxygen passes through the discharge air gap, oxygen molecules are ionized under the action of electric field energy to form free oxygen atoms, and then the free oxygen atoms and the oxygen molecules are recombined to form ozone. The variation process can be expressed by the following equation:

e-+O2->2O+e-；

O+O2+M->O3+M。

the generating chamber of a high-power ozone generator is composed of a plurality of ozone discharge tubes, and a typical high-power ozone generator is provided with thousands of ozone discharge tubes. When the frequency of the voltage applied to the ozone discharge tube is high enough, the ozone discharge tube can be equivalent to an equivalent capacitor C and an equivalent resistor R which are connected in parallel from the circuit point of view, specifically referring to the circuit equivalent model circuit diagram of the ozone discharge tube of the ozone generator shown in fig. 4.

At present, most ozone power supplies are connected in series with an inductor to form a resonant circuit, which is shown in a schematic diagram of the resonant circuit shown in fig. 5 and includes: the ac voltage source, inductor L, voltage V, capacitor C and resistor R, typically apply a square wave ac voltage. The working frequency of the square wave alternating voltage is adjusted to be close to the resonant frequency, and then the frequency and/or duty ratio are finely adjusted to change the voltage V applied to the ozone discharge tube, so that the active power (equal to V2/R) applied to the resistors R of each ozone discharge tube is adjusted, and the purpose of controlling the ozone yield of the discharge tube is achieved. The mainstream ozone generator power supply technology adopts an H full-bridge inverter circuit, and a switching device generally adopts an IGBT. The 50Hz power frequency AC of the power grid is rectified into DC, then converted into high frequency square wave by the inverter and applied to the high frequency transformer, the output of the high frequency transformer is connected in series with a reactor (inductor) and connected to the glass tube chamber of the ozone generator. The high-frequency transformer is used for boosting voltage and isolating, and specifically, refer to a topology diagram of a mainstream ozone power circuit shown in fig. 6.

Generally, the greater the power applied to the ozone discharge tube, the greater the ozone production of the ozone discharge tube. Referring to fig. 7, there is shown a graph of the correspondence between the ozone production of a 20kg/h (20 kg ozone per hour) ozone generator and the active power applied to the ozone generator, wherein the abscissa of the graph 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 non-linear with power, and that the ozone production increases gradually with increasing power, but as power continues to increase to some extent, the production does not increase substantially, entering a so-called "saturated" state. In addition, it can be seen from FIG. 7 that at different power points, although the power increments are the same, the ozone production increments are not the same and may even vary widely. Referring to fig. 7, although Δ P is equal to 50 at both power point P100 and power point P200, Δ OUT1 is much larger than Δ OUT2 by 5.5. Δ OUT1/Δ P equals 0.11 and Δ OUT2/Δ P equals 0.02. The concept of a derivative is used, i.e. the derivative of d (out)/dP at P100 is much larger than at P200. That is, the effect of power increase/decrease on yield variation is not the same at different power points. Moreover, the operation condition of the ozone generator is not constant, such as the air pressure, flow, air source moisture, temperature, discharge voltage, etc. are also changed, which results in that the output-power curve is also changed, i.e. at any power point, the derivative of the output to the power is not constant, and is dynamically changed in real time, although the change process is slow.

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 a power supply of a high-power ozone generator, which comprises the following steps: the ozone generating system comprises N oxygen flowmeters, N ozone concentration meters, N power meters, N ozone power supplies and an upper computer, wherein the upper computer acquires the oxygen flow at the air outlet of an ozone generating area collected by the oxygen flowmeters, the ozone concentration of the ozone generating area collected by the ozone concentration meters and the output power of the corresponding ozone power supplies read by the power meters, and the ozone output of the ozone generating area is obtained according to the oxygen flow and the ozone concentration of the same ozone generating area; adding the obtained initial ozone output of each ozone generation area, calculating to obtain the initial actual total ozone output of the ozone generator, when the initial actual total ozone output is not less than the first preset total ozone output, 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, adding the obtained current ozone output of each ozone generation area, 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 as follows: the quotient of the yield difference value and the power adjustment step length of the same ozone generation area in a preset time period is used for judging whether the current actual total ozone yield is greater than a second preset total ozone yield or not, and if so, the output power of the ozone power supply corresponding to the ozone generation area with the minimum control sensitivity is reduced; if not, the output power of the ozone power supply corresponding to the ozone generation area with the highest control sensitivity is increased. The invention adjusts the power of each ozone generation area according to the sensitivity near the power point of each ozone generation area, more power is distributed to the point with high sensitivity (meaning higher electric energy efficiency), on the contrary, the power is reduced to the point with low sensitivity (meaning lower electric energy efficiency), that is, the invention correspondingly adjusts the power of the ozone power supply corresponding to the ozone generation area according to the different electric energy utilization rates of the ozone discharge tubes in the ozone generation area, thereby improving the whole electric energy utilization rate of the ozone generator, reducing the operation cost and realizing energy conservation and consumption reduction.

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 between 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 a certain extent, i.e. 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 sensitivity Δ OUT/Δ P approaches zero as the curve of the ozone production of the ozone generator versus the active power applied to the ozone generator increases with the variable P; the sensitivity of different discharge tube regions is different for a particular P; even in the same discharge tube area, the sensitivity at a certain P point changes along with the change of the working condition of the ozone generator.

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 O_SetIn 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 O_SetIn 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. In the power 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 region_iAnd power P of each ozone generation region_iFunctional relationship of (a): out_i＝f_i(P_i) 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 a power supply of a high-power ozone generator according to an embodiment of the present invention is disclosed, where the control system includes: n oxygen flowmeters 11, N ozone concentration meters 12, N power meters 13, N ozone power supplies 14 and an upper computer 15, wherein N is a positive integer greater than 1, and the value of N is determined by the size of the ozone generator and the number of discharge tubes, and is generally 2-4.

Wherein:

each of the oxygen flowmeters 11 is installed at an air outlet of an ozone generation area of the ozone generator, and is used for collecting the flow of oxygen at the corresponding air outlet.

The ozone generator is characterized in that 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, air outlets of the ozone generation areas are independent, each ozone power supply is only responsible for supplying power to one ozone generation area, and the ozone power supplies are independent.

It should be noted that, in practical applications, each ozone power supply has the following main components: a rectifier diode; the filter capacitor, the IGBT component, the high-frequency transformer, the high-frequency reactor and the like can be found in the existing mature scheme, and are not described herein again. In addition, each ozone power supply also comprises an independent control system with complete functions.

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 ozone concentration meter 12 is installed on an air outlet of one ozone generation area 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 one of the ozone power supplies 14, and is configured to read the output power of the corresponding ozone power supply 14.

The upper computer 15 is respectively connected with each oxygen flowmeter 11, each ozone concentration meter 12, each power meter 13 and each ozone power supply 14, and 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 and obtaining the ozone output of the ozone generation area according to the oxygen flow and the ozone concentration of the same ozone generation area; 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 actual total ozone yield is less than a first preset total ozone yield, wherein the first preset total ozone yield is as follows: the difference between the target total ozone production and the allowable error is: (ii) an allowable error of the total actual ozone production and the target total ozone production; 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 as follows: the quotient of the yield difference and the power adjustment step length of the same ozone generation area in the preset time period is as follows: a difference between the current ozone production and the initial ozone production for the same ozone generation zone; 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.

It should be noted that, in the present invention, N oxygen flowmeters 11, N ozone concentration meters 12, N power meters 13, N ozone power supplies 14, and an upper computer 15 form a control network.

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 disclosed by the invention comprises: the ozone generating system comprises N oxygen flowmeters, N ozone concentration meters, N power meters, N ozone power supplies and an upper computer, wherein the upper computer acquires the oxygen flow at the air outlet of an ozone generating area collected by the oxygen flowmeters, the ozone concentration of the ozone generating area collected by the ozone concentration meters and the output power of the corresponding ozone power supplies read by the power meters, and the ozone output of the ozone generating area is obtained according to the oxygen flow and the ozone concentration of the same ozone generating area; adding the obtained initial ozone output of each ozone generation area, calculating to obtain the initial actual total ozone output of the ozone generator, when the initial actual total ozone output is not less than the first preset total ozone output, 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, adding the obtained current ozone output of each ozone generation area, 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 as follows: the quotient of the yield difference value and the power adjustment step length of the same ozone generation area in a preset time period is used for judging whether the current actual total ozone yield is greater than a second preset total ozone yield or not, and if so, the output power of the ozone power supply corresponding to the ozone generation area with the minimum control sensitivity is reduced; if not, the output power of the ozone power supply corresponding to the ozone generation area with the highest control sensitivity is increased. The invention adjusts the power of each ozone generation area according to the sensitivity near the power point of each ozone generation area, more power is distributed to the point with high sensitivity (meaning higher electric energy efficiency), on the contrary, the power is reduced to the point with low sensitivity (meaning lower electric energy efficiency), that is, the invention correspondingly adjusts the power of the ozone power supply corresponding to the ozone generation area according to the different electric energy utilization rates of the ozone discharge tubes in the ozone generation area, thereby improving the whole electric energy utilization rate of the ozone generator, reducing the operation cost and realizing energy conservation and consumption reduction.

In a normal state, 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 a certain ozone power supply 14 is lost in communication with the upper computer 15, each ozone power supply 14 is separated from the network control to operate independently, so that the ozone generator can work normally, and only the ozone power supplies 14 cannot be optimally controlled.

To further understand the process of the present invention for optimizing control of each ozone power supply, the present invention also provides a specific embodiment, as follows:

it is assumed that the generation chamber of the ozone generator is divided into 3 ozone generation regions, i.e., N-3, each of which is supplied with power from one ozone power source.

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: p_i，i＝1，2，3。

The maximum allowable power of each ozone power supply is Pmax_i，i＝1，2，3。

The minimum allowable power of each ozone power supply is Pmin_i,i＝1，2，3。

O_SetThe 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 Out_i/ΔP，i＝1，2，3，ΔOut_iThe 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 O_SetAnd the power output of each ozone power supply is set at the maximum allowable power Pmax of each ozone power supply_iAnd the operation is full power.

In actual operation, in order to facilitate the control and improve the stability of the control of the ozone power supply, a certain error is allowed between the target total ozone production (set value) and the actual ozone production. In this example, epsilon is used, and the size of epsilon depends on the actual situation.

If the actual total ozone production sigma Out of three ozone generating areas is less than O_SetEpsilon, indicating that no ozone production is possible at full powerThe standard is reached, in this case, the control optimization can not be carried out, and the system (the ozone generator as a whole, the same below) is kept in the full power state. Otherwise, entering a sensitivity calculation initialization link.

Sensitivity calculation is carried Out, and delta Out needs to be calculated firstly_i(i ═ 1,2,3), ozone production Out0 before power change_i(i ═ 1,2,3) and ozone production after power change Out1_iAnd the difference Δ Out thereof_i＝Out1_i-Out0_iAnd Δ P.

The method adopted by the invention is as follows: when the ozone generator is powered on and put into operation, P_i＝Pmax_i(i ═ 1,2,3), and when the ozone generator was stable in operation, the ozone production Out0 in each ozone generation area was recorded_i. Then P_i＝P_iΔ P, ozone production Out1 for each ozone generation zone after power change was recorded after ozone production stabilized_iThen, Δ Out is obtained_i＝Out1_i–Out0_iThus, the sensitivity Δ Out can be calculated_iAnd/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 T_iAnd will last Out1_iValue of to Out0_iThen, Δ Out can be found_i＝Out1_i–Out0_iAnd deducing the sensitivity of the next step. The power is not required to be additionally changed in calculation, and the power change is smooth in the whole optimization process. Next, the sensitivity Δ Out of each ozone generation region was calculated_iAnd/Δ P (i ═ 1,2, 3). It should be noted that Δ P is defined as a power adjustment step size, which is an 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>(O_Set+ epsilon), the output power of the ozone power supply corresponding to the ozone generating region with the least sensitivity is controlled to be reduced by power deltap, while the power of the rest of the region is not changed. Before power reduction is carried out, out exceeding judgment. In actual operation of the system, the output power of the power supply should be kept within a range, and should not exceed the maximum allowable power, nor be less than the minimum allowable power, so that the normal operation of the system can be ensured. The out-of-range determination is to check whether the power is out of the range. If P-. DELTA.P<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<(O_SetEpsilon), 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,O_Set+ε]I,, i ∑ Out-O_Set│<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, a time delta T is needed to be delayed. From a control theory point of view, the ozone generator is a lag system, and the ozone production needs a period of time to be stable again after the power parameter is changed. The time for which the output re-stabilizes varies from system to system, so the Δ T parameter will depend on the particular ozone system.

After enough time delay, the sensitivity calculation, judgment and adjustment are carried out again, the process is repeated, and the process is carried out all the time, finally, the system is stabilized in a certain state, at the moment, the actual total ozone yield and the target yield are kept within the set error, and meanwhile, 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 goal of optimizing the system is achieved.

The algorithm described above is very compact and adjusts the power point of each zone according to the sensitivity (i.e., rate of change of production versus power) near the power point of each zone: a point with high sensitivity (meaning more power efficient) allocates more power (increasing Δ P), whereas a point with low sensitivity (meaning less power efficient) cuts its power (decreasing Δ P). The algorithm does not specify which ozone generating zone has a corresponding curve of ozone production to active power applied to the ozone generating zone, nor which segment of the curve, all of which is adjusted according to the curve rate of change (i.e., derivative value of the point) in the vicinity of the current power point, and thus is dynamically adjusted to automatically adjust to different power points and/or to changes in the curve.

As is well known, a classical optimization design requires the knowledge of an objective function, otherwise, the calculation cannot be performed. In this example, the objective function is a function of the relationship between the ozone production of each ozone generation zone and the active power applied to the ozone generation zone, which is dynamically changed in real time and is difficult to computationally derive an analytical expression, and thus the classical optimization method cannot be directly applied here. The algorithm introduced in the embodiment skillfully avoids the problem, and the optimal operating point of each curve is searched by calculating the change rate near the power point. Another significant advantage of this algorithm is that the power search, adjustment is smooth, and as long as the step size Δ P is set reasonably (small enough), the ozone production output does not fluctuate dramatically. So far it is clear why defining Δ P as the step size is the "step" of the optimization search.

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 the power supply of the high-power ozone generator.

Referring to fig. 11, a flowchart of a control method for a power supply of a high power ozone generator according to an embodiment of the present invention is disclosed, the method is applied to the control system shown in fig. 9, and the control method includes the steps of:

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 a first preset total ozone yield, if not, executing step S104, and if so, returning to execute step S101;

the first preset total ozone yield is as follows: the difference between the target total ozone production and the allowable error is: the actual total ozone production and the target total ozone production.

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 as follows: the quotient of the yield difference and the power adjustment step length of the same ozone generation area in the preset time period is as follows: the difference between the current ozone production and the initial ozone production for the same ozone generation zone.

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:

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:

In summary, in the control method of the power supply of the high-power ozone generator disclosed by the invention, the upper computer obtains the oxygen flow at the air outlet of the ozone generation area collected by the oxygen flow meter, the ozone concentration of the ozone generation area collected by the ozone concentration meter and the output power of the corresponding ozone power supply read by the power meter, and the ozone output of the ozone generation area is obtained according to the oxygen flow and the ozone concentration of the same ozone generation area; adding the obtained initial ozone output of each ozone generation area, calculating to obtain the initial actual total ozone output of the ozone generator, when the initial actual total ozone output is not less than the first preset total ozone output, 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, adding the obtained current ozone output of each ozone generation area, 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 as follows: the quotient of the yield difference value and the power adjustment step length of the same ozone generation area in a preset time period is used for judging whether the current actual total ozone yield is greater than a second preset total ozone yield or not, and if so, the output power of the ozone power supply corresponding to the ozone generation area with the minimum control sensitivity is reduced; if not, the output power of the ozone power supply corresponding to the ozone generation area with the highest control sensitivity is increased. The invention adjusts the power of each ozone generation area according to the sensitivity near the power point of each ozone generation area, more power is distributed to the point with high sensitivity (meaning higher electric energy efficiency), on the contrary, the power is reduced to the point with low sensitivity (meaning lower electric energy efficiency), that is, the invention correspondingly adjusts the power of the ozone power supply corresponding to the ozone generation area according to the different electric energy utilization rates of the ozone discharge tubes in the ozone generation area, thereby improving the overall electric energy utilization rate of the ozone generator.

To further optimize the above embodiment, before performing step S109, the method may further include:

if yes, go to step S109;

if not, the step S105 is executed in a returning way.

From a control theory point of view, the ozone generator is a lag system, and the ozone production needs a period of time to be stable again after the power parameter is changed. The time for which the output re-stabilizes varies from system to system, so the Δ T parameter will depend on the particular ozone system.

It can be understood that the control process of the power supply of the high-power ozone generator is a real-time dynamic control process, and therefore, with the embodiment shown in fig. 11, after completing the control of the power supply of the high-power ozone generator once, 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，…，Out_n。

Actual total ozone production ∑ Out ═ Out₁+Out₂+…+Out_n。

The power of each ozone generation area is as follows: p₁，P₂，…，P_n。

The maximum allowable output power of each ozone power supply is Pmax₁，Pmax₂，…，Pmax_n。

The minimum allowable output power of each ozone power supply is Pmin₁，Pmin₂，…，Pmin_n。

O_SetThe target ozone production.

Δ T is the delay time.

The sensitivity of the ith ozone generation zone is defined as: Δ Out_i/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 O_SetIs not greater than the rated output of the ozone generator.

The system operates in a full power state: p₁＝Pmax₁，P₂＝Pmax₂，…，P_n＝Pmax_n. Recording the yield Out0 of each area after the yield is stable_iAnd (i ═ 1,2, …, n), and calculates Σ Out.

If Σ Out<(O_SetEpsilon), 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 recorded_i(i ═ 1,2, …, n), and calculates Σ Out. At this time, Δ Out may also be obtained_i＝Out1_i-Out0_i。

Next, the current sensitivity of each ozone generation region was calculated: Δ Out_iAnd/Δ P, (i ═ 1,2, …, n). After the current sensitivity of each ozone generation area is obtained, the judgment and the power regulation are started, and the specific steps are as follows:

if the total ozone production sigma Out>(O_Set+ 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<(O_Setε), 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,O_Set+ε]I.e., | Out-O_Set│<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 zone_iThen, 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 time_iValue assignment to Out0_iRefresh Out0_i. Then, a round of: recording power adjusted yield Out1_iCalculating sigma Out, calculating sensitivity, judging and adjusting power. And so on continuously. In this process, the operating point P of each ozone generation region_iGradually moving towards the optimum power point. Finally, satisfy ∑ Out-O_Set│<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, in the present invention, the three parameters of ∈, Δ P, and Δ T are not necessarily fixed and may be changed dynamically in accordance with changes in the operating conditions during 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, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

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.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. 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. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A control system of a high-power ozone generator power supply is characterized by comprising: n oxygen flowmeters, N ozone concentration meters, N power meters, N ozone power supplies and an upper computer, wherein N is a positive integer greater than 1;

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. A control method for a power supply of a high-power ozone generator is applied to an upper computer in the control system of claim 1, and comprises the following steps:

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:

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:

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:

7. The control method according to claim 3, characterized by further comprising: