Energy-saving control method for pulse power supply of dust collector

Abstract

The present invention proposes an energy-saving control algorithm for a pulse power supply of a dust collector, comprising the following steps: S1. Setting a target value T for dust emission; S2. Setting a control interval value for dust emission, including a lower limit value a of the dust control interval and an upper limit value b of the dust control interval; S3. Reading the turbidity meter reading m; S4. Judging the size relationship among m, a×T and b×T, and determining the next execution code of the program: if m>b×T, calling the "increase operating parameter subroutine" to increase the operating parameters; after the subroutine is completed, returning to step S3 after 5 minutes; if a×T≤m≤b×T, maintaining the current parameters of the power supply; executing step S3 after 1 minute; S43. If m<a×T, calling the "reduce operating parameter subroutine" to reduce the operating parameters; returning to step S3 after 5 minutes. The algorithm can realize real-time adjustment of operating parameters, improve energy-saving effects, and ensure the stability of power supply operation.

Description

Technical Field

[0001] The invention relates to the technical field of dust collector energy-saving control, in particular to an energy-saving control method for a dust collector pulse power supply. Background Art

[0002] Pulse power supply is a new generation of power supply device for electrostatic precipitator, which can be widely used in flue gas dust treatment in power, metallurgy, chemical industry, cement and other industries, and can achieve efficient dust removal and environmental protection. Energy consumption is an important indicator for evaluating the performance of pulse power supply, and its energy consumption is mainly related to the output parameters of pulse power supply, including basic voltage, basic current, pulse peak voltage, pulse peak current, pulse repetition rate, etc.

[0003] There are two ways to achieve energy saving in the existing technology. One is manual operation, which manually adjusts various parameters through human control, with the main purpose of achieving dust emission standards, appropriately reducing the power supply operating parameters, and not re-optimizing the power supply operating parameters to achieve the optimal energy-saving operating parameters. The other is conventional energy-saving control, which controls the rise and fall of the output parameters as a whole synchronously according to the dust emission index of the turbidity meter.

[0004] The existing energy-saving methods of pulse power supply are mainly manual adjustment and simple automatic adjustment.

[0005] The main disadvantages of manually adjusting operating parameters are: first, it requires high technical level of operators, and they must have sufficient understanding of the matching operating characteristics of dust collectors and power supplies. Second, it is impossible to adjust operating parameters in real time as working conditions change. Manual adjustment is often lagging and cannot achieve the best energy-saving effect.

[0006] The existing simple energy-saving control method has the following main disadvantages: the overall lifting and lowering of operating parameters cannot achieve a good match between the power supply and the dust collector. The different electric fields and working conditions of the dust collector require different power supply parameters to be adjusted. The overall adjustment can neither achieve the best energy-saving effect nor guarantee the stability of the power supply operation. Summary of the invention

[0007] The purpose of the present invention is to solve the problems in the prior art and to propose an energy-saving control method for a pulse power supply of a dust collector, which can realize real-time adjustment of operating parameters, improve energy-saving effects, and ensure the stability of power supply operation.

[0008] To achieve the above object, the present invention proposes an energy-saving control method for a pulse power supply of a dust collector, comprising the following steps:

[0009] S1. Set the target value T for dust emission, and the energy-saving control program reads this value;

[0010] S2. Set the control interval value of dust emission, including a and b, where a is the lower limit of the dust control interval, ranging from 0 to 100%, and b is the upper limit of the dust control interval, ranging from 0 to 100%, and b is greater than a;

[0011] S3. Read the turbidity meter reading m to monitor the emission effect in real time;

[0012] S4. Determine the relationship between m and T, determine the size relationship between m, a×T, and b×T, and determine the next execution code of the program:

[0013] S41. If m>b×T, call the first operating parameter subroutine to increase the operating parameters; after the subroutine is completed, wait for a certain period of time and return to step S3 to further determine the relationship between the actual emission value and the target value;

[0014] S42. If a×T≤m≤b×T, no processing is required at this time, and the power supply maintains the existing parameters; after waiting for a certain period of time, execute step S3 to further determine the relationship between the actual emission value and the target value;

[0015] S43. If m<a×T, call the "second operating parameter subroutine" to reduce the operating parameters; after the subroutine is completed, wait for a certain period of time and return to step S3 to further determine the relationship between the actual emission value and the target value.

[0016] Preferably, in step S41, the first operating parameter subroutine specifically includes the following steps:

[0017] S411. Read the current power supply operating parameter basic voltage V dc , pulse peak voltage V ps , pulse repetition rate f;

[0018] S412. Calculate positive impact factors A+, B+, C+;

[0019] S413. Calculate the stability coefficient Q corresponding to the current parameter using formula (1) dc , Q ps , Q f ;

[0020] ; ; ; (1)

[0021] S414. Calculate Q dc ×A+, Q ps ×B+, Q f ×C+;

[0022] S415. First determine the magnitude relationship between m and T;

[0023] If m>T, compare Q dc ×A+, Q ps ×B+, Q f ×C+the size of the three, take the parameter corresponding to the minimum value and increase it; if the Q corresponding to the basic voltage dc ×A+minimum, add 5kV; if the pulse peak voltage corresponds to Q ps ×B+minimum, add 5kV; if the pulse repetition rate corresponds to Q f ×C+minimum, increase the pulse repetition rate by 5Hz, and the program ends;

[0024] If m≤T, compare Q dc ×A+, Q ps ×B+, Q f ×C+the size of the three, take the parameter corresponding to the minimum value and increase it; if the Q corresponding to the basic voltage dc ×A+minimum, increase 1kV; if the pulse peak voltage corresponds to Q ps ×B+minimum, add 1kV; if the pulse repetition rate corresponds to Q f ×C+minimum, increase the pulse repetition rate by 1Hz, and the program ends.

[0025] Preferably, in step S412, the energy consumption formula for calculating the positive impact factor is:

[0026] , , ;

[0027] in, When the base voltage is increased by 1kV, the power consumption of this power supply increases; It is the value of the increase in power consumption of this power supply when the pulse peak voltage increases by 1kV; It is the value of the increase in power consumption of this power supply when the pulse repetition rate increases by 1Hz; P is the power consumption of this power supply in the current operating state.

[0028] Preferably, in step S43, the "second operating parameter subroutine" specifically includes the following steps:

[0029] S431. Read the current power supply operating parameter basic voltage V dc , pulse peak voltage V ps , pulse repetition rate f;

[0030] S432. Calculate negative impact factors A-, B-, C-;

[0031] S433. Calculate the stability coefficient Q corresponding to the current parameter using formula (2) dc , Qps , Q f ;

[0032] ; ; ; (2)

[0033] S434. Calculate A- / Q dc , B- / Q ps , C- / Q f ;

[0034] S435. Compare the sizes of the above three and take the maximum value;

[0035] If A- / Q dc If it is the maximum, the base voltage is reduced by 1 kV and the program ends;

[0036] If B- / Q ps If the pulse peak voltage is the maximum, the pulse peak voltage is reduced by 1 kV and the program ends;

[0037] If C- / Q f Maximum, the pulse repetition rate is reduced by 1 Hz and the program ends.

[0038] Preferably, in step S432, the energy consumption formula for calculating the negative impact factor is:

[0039] , , ;

[0040] in, When the base voltage is reduced by 1kV, the power consumption of this power supply is reduced; The power consumption of this power supply decreases when the pulse peak voltage decreases by 1kV; It is the value of power consumption reduction of this power supply when the pulse repetition rate decreases by 1Hz; P is the power consumption of this power supply in the current operating state.

[0041] Preferably, the basic voltage V dc The operating range is generally 0kV-80kV, and the pulse peak voltage V ps The operating range of is generally 0kV-80kV, and the operating range of the pulse repetition rate f is generally 1Hz-200Hz.

[0042] Preferably, after the first operating parameter subroutine in step S41 is completed, wait for 5 minutes and return to step S3.

[0043] Preferably, in step S42, the power supply is operated with existing parameters maintained, and after waiting for 1 minute, step S3 is executed.

[0044] Preferably, after the "second operating parameter subroutine" in step S43 is completed, wait for 5 minutes and return to step S3.

[0045] Preferably, the target value T of dust emission in step S1 is set by the user in the control program through the user interaction interface, and the control interval value of dust emission in step S2 is set by the user in the control program through the user interaction interface.

[0046] Beneficial effects of the present invention:

[0047] The pulse power supply energy-saving control algorithm of the present invention introduces the concept of influencing factors, compares the contribution of each parameter to energy saving, and achieves the best energy-saving effect; at the same time, it introduces the concept of stability coefficient, and while adjusting the parameters, it takes into account the rationality of each power supply parameter and the stability of the equipment, and achieves the best energy-saving and operating effect of the power supply.

[0048] The energy-saving control algorithm program of the present invention monitors dust emission indicators in real time, and the main adjustment parameters are input by the user. The energy-saving algorithm target can be adjusted in a personalized manner according to different operating conditions and user needs to achieve optimal adaptability to the operating conditions.

[0049] The features and advantages of the present invention will be described in detail through embodiments in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 It is a general flow chart of an energy-saving control method for a pulse power supply of a dust collector according to the present invention;

[0051] Figure 2 It is a first operating parameter subroutine flow chart of an energy-saving control method for a pulse power supply of a dust collector according to the present invention;

[0052] Figure 3 The present invention is a second operating parameter subroutine flow chart of an energy-saving control method for a pulse power supply of a dust collector. DETAILED DESCRIPTION

[0053] The present invention proposes an energy-saving control method for a pulse power supply of a dust collector, wherein the adjustment of the pulse power supply parameters mainly includes three parameters: basic voltage, pulse peak voltage, and pulse repetition rate. The present invention introduces the concept of influencing factor, which refers to the ratio of the increase (or decrease) of electric energy after the unit parameter is increased (or decreased) based on the current operating value of the parameter. The present invention introduces three influencing factor parameters, namely basic voltage influencing factor A, pulse peak voltage influencing factor B, and pulse repetition rate influencing factor C. The calculation formula is as follows:

[0054] , , ;

[0055] , , ;

[0056] in, This is the value by which the power consumption of this power supply increases when the base voltage increases by 1kV. This is the increase in power consumption of the power supply when the pulse peak voltage increases by 1kV. This is the value by which the power consumption of this power supply increases when the pulse repetition rate increases by 1 Hz. This is the value by which the power consumption of this power supply decreases when the base voltage decreases by 1 kV. This is the value by which the power consumption of this power supply decreases when the pulse peak voltage decreases by 1 kV. The power consumption of this power supply decreases when the pulse repetition rate decreases by 1Hz. P is the power consumption of this power supply in the current operating state.

[0057] Positive impact factor ( ) is smaller, indicating that in the current state, increasing this parameter will result in less energy consumption increase; negative impact factor ( ), the larger the parameter, the more energy consumption can be reduced by reducing the parameter in the current state. Therefore, when the emission of the electrostatic precipitator increases and it is necessary to increase the power supply operation parameters to reduce the emission, the parameters with small positive impact factors should be increased first; when the emission of the electrostatic precipitator is far lower than the emission index and appropriate energy saving can be achieved, the parameters with large negative impact factors should be reduced first.

[0058] In addition, the present invention introduces the concept of stability coefficient. The stability coefficient refers to the stability of a certain parameter of the power supply under the current operating value. The maximum value of the stability coefficient is 1. As the operating parameters increase, the stability of the equipment will decrease, that is, the stability coefficient decreases. The introduction of the stability coefficient is based on the consideration of protecting the power supply, reducing the failure rate, and maintaining the stability of the equipment. After statistics on the long-term operation status of the power supply, the general rules of the stability coefficients of the three parameters of the pulse power supply basic voltage, pulse peak voltage, and pulse repetition rate are summarized as follows:

[0059] (1) Basic voltage stability coefficient Q dc . Basic voltage V dc The operating range is generally 0kV-80kV. Stability coefficient Q dc With the base voltage V dc The relationship can generally be summarized as:

[0060] ;

[0061] (2) Pulse peak voltage stability factor Q ps . Pulse peak voltage V ps The operating range is generally 0kV-80kV. Stability coefficient Q psWith pulse peak voltage V ps The relationship can generally be summarized as:

[0062] ;

[0063] (3) Pulse repetition rate stability coefficient Q f The pulse repetition rate f generally operates in the range of 1Hz-200Hz. Stability coefficient Q f The relationship with the pulse repetition rate f can generally be summarized as:

[0064] .

[0065] Based on the stability coefficient and influencing factor, the energy-saving control algorithm of the present invention is designed. Figure 1 The program running process is as follows:

[0066] 1. The control program sets the target value T of dust emission through the user interface. The energy-saving control program reads this value;

[0067] 2. The control program allows the user to set the dust emission control interval values ​​a and b through the user interaction interface. The value range of a is 0-100%, which means the lower limit of the dust control interval. When the actual dust emission is lower than a×T, it indicates that the dust removal effect is good, and the power supply operating parameters can be reduced to achieve energy saving. The value range of b is 0-100%, and b is required to be greater than a. It means the upper limit of the dust control interval. When it is higher than b×T, it indicates that the dust removal effect is poor, and the power supply operating parameters need to be increased to reduce emissions;

[0068] 3. Read the turbidity meter reading m. It is used to monitor the emission effect in real time, and to evaluate the emission effect and control the power supply operating parameters based on the turbidity meter reading;

[0069] 4. Determine the relationship between m and T. Determine the size relationship between m, a×T, and b×T to determine the next execution code of the program:

[0070] 1) If m>b×T, it means that the emission effect is poor, and the operating parameters of the power supply need to be increased to reduce the emission value. Call the first operating parameter subroutine to increase the operating parameters. After the subroutine is completed, wait for 5 minutes and return to step 3 to further determine the relationship between the actual emission value and the target value;

[0071] 2) If a×T≤m≤b×T, it means that the emission effect is within a reasonable range, neither too high nor too low, and there is no room for energy saving. No processing is required at this time, and the power supply can be operated with the existing parameters. After waiting for 1 minute, execute step 3 to further determine the relationship between the actual emission value and the target value;

[0072] 3) If m<a×T, it means that the emission effect is good and there is room for energy saving. The operating parameters of the power supply can be reduced to achieve power saving. Call the "Second Operating Parameter Subroutine" to reduce the operating parameters. After the subroutine is completed, wait for 5 minutes and return to step 3 to further determine the relationship between the actual emission value and the target value.

[0073] The first operating parameter subroutine realizes the addition of different operating parameters of the power supply. Its flow chart is shown in Figure 2 The program running process is as follows:

[0074] 1. Read the current power supply operating parameters basic voltage V dc , pulse peak voltage V ps , pulse repetition rate f;

[0075] 2. Calculate the positive impact factors A+, B+, and C+ through the energy consumption formula;

[0076] 3. Calculate the stability coefficient Q corresponding to the current parameters through the formula dc , Q ps , Q f ;

[0077] 4. Calculate Q dc ×A+, Q ps ×B+, Q f ×C+;

[0078] 5. First determine the relationship between m and T:

[0079] 1) If m>T, it means that the emission has exceeded the standard and the operating parameters need to be increased as soon as possible to reduce the emission. dc ×A+, Q ps ×B+, Q f ×C+, the parameter corresponding to the minimum value is increased, and because the emission exceeds the standard, a larger parameter needs to be increased. If the Q corresponding to the basic voltage dc ×A+minimum, add 5kV; if the pulse peak voltage corresponds to Q ps ×B+minimum, add 5kV; if the pulse repetition rate corresponds to Q f ×C+minimum, increase the pulse repetition rate by 5Hz. The program ends;

[0080] 2) If m≤T, it means that the emission is not exceeding the standard, but is close to the limit. It is necessary to increase the operating parameters to reduce the emission and ensure that there is a certain margin for the actual emission index. dc ×A+, Q ps ×B+, Q f×C+, take the parameter corresponding to the minimum value and increase it. Since the emission does not exceed the standard, it is sufficient to increase the basic parameters. dc ×A+minimum, increase 1kV; if the pulse peak voltage corresponds to Q ps ×B+minimum, add 1kV; if the pulse repetition rate corresponds to Q f ×C+minimum, increase the pulse repetition rate by 1Hz. The program ends.

[0081] The second operating parameter subroutine realizes the reduction of different operating parameters of the power supply. Its flow chart is shown in Figure 3 The program running process is as follows:

[0082] 1. Read the current power supply operating parameters basic voltage V dc , pulse peak voltage V ps , pulse repetition rate f;

[0083] 2. Calculate the negative impact factors A-, B-, and C- through the energy consumption formula;

[0084] 3. Calculate the stability coefficient Q corresponding to the current parameters through the formula dc , Q ps , Q f ;

[0085] 4. Calculate A- / Q dc , B- / Q ps , C- / Q f ;

[0086] 5. Compare the above three values ​​and take the maximum value. This means that reducing the power supply parameters corresponding to the maximum value can achieve the best effect of energy saving and stability:

[0087] 1) If A- / Q dc Maximum, then reduce the base voltage by 1kV. The program ends;

[0088] 2) If B- / Q dc Maximum, then reduce the pulse peak voltage by 1kV. The program ends;

[0089] 3) If C- / Q f If the pulse repetition rate is the maximum, the pulse repetition rate is reduced by 1 Hz. The program ends.

[0090] The above embodiments are intended to illustrate the present invention, not to limit the present invention. Any solution that is a simple transformation of the present invention belongs to the protection scope of the present invention.

Claims

1. An energy-saving control method for a pulse power supply of a dust collector, characterized in that: The following steps are involved: S1. Set the target value T for dust emission, and the energy-saving control program reads this value; S2. Set the control interval value of dust emission, including a and b, where a is the lower limit of the dust control interval, ranging from 0 to 100%, and b is the upper limit of the dust control interval, ranging from 0 to 100%, and b is greater than a; S3. Read the turbidity meter reading m to monitor the emission effect in real time; S4. Determine the relationship between m and T, determine the size relationship between m, a×T, and b×T, and determine the next execution code of the program: S41. If m>b×T, call the first operating parameter subroutine to increase the operating parameters; after the subroutine is completed, wait for a certain period of time and return to step S3 to further determine the relationship between the actual emission value and the target value; S42. If a×T≤m≤b×T, no processing is required at this time, and the power supply maintains the existing parameters; after waiting for a certain period of time, execute step S3 to further determine the relationship between the actual emission value and the target value; S43. If m<a×T, call the second operating parameter subroutine to reduce the operating parameters; after the subroutine is completed, wait for a certain period of time and return to step S3 to further determine the relationship between the actual emission value and the target value; In step S41, the first operating parameter subroutine specifically includes the following steps: S411. Read the current power supply operating parameter basic voltage V dc , pulse peak voltage V ps , pulse repetition rate f; S412. Calculate positive impact factors A+, B+, C+; S413. Calculate the stability coefficient Q corresponding to the current parameter using formula (1) dc , Q ps , Q f ; ； ； ； （1） S414. Calculate Q dc ×A+, Q ps ×B+, Q f ×C+; S415. First determine the magnitude relationship between m and T; If m>T, compare Q dc ×A+, Q ps ×B+, Q f ×C+the size of the three, take the parameter corresponding to the minimum value and increase it; if the Q corresponding to the basic voltage dc ×A+minimum, add 5kV; if the pulse peak voltage corresponds to Q ps ×B+minimum, add 5kV; if the pulse repetition rate corresponds to Q f ×C+minimum, increase the pulse repetition rate by 5Hz, and the program ends; If m≤T, compare Q dc ×A+, Q ps ×B+, Q f ×C+the size of the three, take the parameter corresponding to the minimum value and increase it; if the Q corresponding to the basic voltage dc ×A+minimum, increase 1kV; if the pulse peak voltage corresponds to Q ps ×B+minimum, add 1kV; if the pulse repetition rate corresponds to Q f ×C+minimum, increase the pulse repetition rate by 1Hz, and the program ends.

2. The energy-saving control method for a pulse power supply of a dust collector according to claim 1, characterized in that: In step S412, the energy consumption formula for calculating the positive impact factor is: , , ； in, When the base voltage is increased by 1kV, the power consumption of this power supply increases; It is the value of the increase in power consumption of this power supply when the pulse peak voltage increases by 1kV; It is the value of the increase in power consumption of this power supply when the pulse repetition rate increases by 1Hz; P is the power consumption of this power supply in the current operating state.

3. The energy-saving control method for a pulse power supply of a dust collector according to claim 1, characterized in that: In step S43, the second operating parameter subroutine specifically includes the following steps: S431. Read the current power supply operating parameter basic voltage V dc , pulse peak voltage V ps , pulse repetition rate f; S432. Calculate negative impact factors A-, B-, C-; S433. Calculate the stability coefficient Q corresponding to the current parameter using formula (2) dc , Q ps , Q f ; ； ； ；（2） S434. Calculate A- / Q dc , B- / Q ps , C- / Q f ; S435. Compare the sizes of the above three and take the maximum value; If A- / Q dc If it is the maximum, the base voltage is reduced by 1 kV and the program ends; If B- / Q ps If the pulse peak voltage is the maximum, the pulse peak voltage is reduced by 1 kV and the program ends; If C- / Q f Maximum, the pulse repetition rate is reduced by 1 Hz and the program ends.

4. The energy-saving control method for a pulse power supply of a dust collector according to claim 3, characterized in that: In step S432, the energy consumption formula for calculating the negative impact factor is: , , ； in, When the base voltage is reduced by 1kV, the power consumption of this power supply is reduced; The power consumption of this power supply decreases when the pulse peak voltage decreases by 1kV; It is the value of power consumption reduction of this power supply when the pulse repetition rate decreases by 1Hz; P is the power consumption of this power supply in the current operating state.

5. The energy-saving control method for a pulse power supply of a dust collector according to claim 1 or 3, characterized in that: The basic voltage V dc The operating range is 0kV-80kV, the pulse peak voltage V ps The operating range of the pulse repetition rate f is 0 kV-80 kV, and the operating range of the pulse repetition rate f is 1 Hz-200 Hz.

6. The energy-saving control method for a pulse power supply of a dust collector according to claim 1, characterized in that: After the first operating parameter subroutine in step S41 is completed, wait for 5 minutes and return to step S3.

7. The energy-saving control method for a pulse power supply of a dust collector according to claim 1, characterized in that: In step S42, the power supply is operated with the existing parameters, and after waiting for 1 minute, step S3 is executed.

8. The energy-saving control method for a pulse power supply of a dust collector according to claim 1, characterized in that: After the second operating parameter subroutine in step S43 is completed, wait for 5 minutes and return to step S3.

9. The energy-saving control method for a pulse power supply of a dust collector according to claim 1, characterized in that: In step S1, the target value T of dust emission is set by the user through the user interaction interface, and in step S2, the control interval value of dust emission is set by the user through the user interaction interface.

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