阅读说明：本技术 一种抗晃电模块的切换控制方法及抗晃电模块 (Switching control method of anti-interference module and anti-interference module ) 是由 姚鹏 王海玉 刘玉莹 谢宜舜 朱志伟 李波 于 2021-07-09 设计创作，主要内容包括：本发明涉及一种抗晃电模块的切换控制方法及抗晃电模块,该方法先根据接触器线圈的额定电压有效值计算得到额定电压的标准正弦数组；然后根据实际采样的接触器线圈端电压计算电压偏差判定是否发生晃电,且在晃电发生后控制接触器线圈由交流电源供电切换为抗晃电模块供电；接着在接触器线圈切换为抗晃电模块供电后,根据实际采样的接触器线圈端电压计算电压偏差判断是否晃电消失；在晃电消失后,且晃电恢复时间达到反切限定时间定值时,控制接触器线圈由抗晃电模块供电切换为交流电源供电；最后在超出抗晃电模块的供电能力后强制控制由抗晃电模块切回到交流电源供电。可有效解决电网上接触器面临的晃电造成脱扣问题,控制可靠性高,兼顾了控制过程各个器件的动作行程时间,有效提高了抗晃电模块的使用寿命,且逻辑完整性和适用性强。(The invention relates to a switching control method of an anti-interference module and the anti-interference module, firstly calculating to obtain a standard sine array of rated voltage according to the rated voltage effective value of a contactor coil; then, calculating voltage deviation according to the actually sampled terminal voltage of the contactor coil to judge whether the interference occurs, and controlling the contactor coil to be switched from the alternating current power supply to the interference prevention module to supply power after the interference occurs; then, after the contactor coil is switched to supply power to the anti-interference module, calculating voltage deviation according to the actually sampled terminal voltage of the contactor coil to judge whether interference disappears; after the interference electricity disappears and the interference electricity recovery time reaches the fixed value of the reverse switching limit time, controlling the coil of the contactor to be switched from the power supply of the anti-interference electricity module to the power supply of an alternating current power supply; and finally, after the power supply capacity of the anti-interference module is exceeded, the anti-interference module is forcibly controlled to switch back to the alternating current power supply for supplying power. The problem that the contactor on the power grid is subjected to electricity interference to cause tripping can be effectively solved, the control reliability is high, the action travel time of each device in the control process is considered, the service life of the anti-interference module is effectively prolonged, and the logic integrity and the applicability are strong.)

1. A method of switching control of an anti-interference module, comprising:

s100, calculating a standard sine array of rated voltage, and calculating to obtain the standard sine array of the rated voltage according to the effective value of the rated voltage of the coil of the contactor;

s200, judging power interference and performing tangent time sequence control, calculating voltage deviation according to the actually sampled terminal voltage of the contactor coil, judging whether power interference occurs, and controlling the contactor coil to be switched from an alternating current power supply to an anti-power interference module to supply power after the power interference occurs;

s300, judging whether the electric dazzling disappears or not, wherein after the contactor coil is switched to the anti-dazzling module to supply power, voltage deviation is calculated according to the actually sampled terminal voltage of the contactor coil to judge whether the electric dazzling disappears or not;

s400, reverse switching time sequence control, wherein after the electric dazzling disappears and the electric dazzling recovery time reaches a reverse switching limited time fixed value, the coil of the contactor is controlled to be switched to be supplied with power by an alternating current power supply through an anti-dazzling module;

s500, performing out-of-limit control, namely forcibly controlling the anti-interference module to switch back to the alternating current power supply to supply power after the power supply capacity of the anti-interference module is exceeded.

2. The method according to claim 1, wherein the step S100 is specifically:

s101, the effective value of the rated voltage of the contactor coil is V_{N_RMS}And then establishing a rated voltage standard sine array according to a formula:wherein sin () is a sine function; k is the current control period of the controller, and k is more than or equal to 0 and less than or equal to M; m is the number of array elements, and M ═ f_s/50，f_sIs the control frequency of the controller;

s102: performing phase-locked calculation on the terminal voltage of the contactor coil to obtain the current phase theta of the voltage;

s103: at the current control period time k, the rated voltage standard sine value of the position of the terminal voltage of the contactor coil in the sine array is SIN [ k ]]Wherein

3. The method of claim 1, wherein the "power-on-interference determination and tangent timing control" in the step S200 specifically includes:

s201, calculating to obtain voltage deviation according to the terminal voltage obtained by actual sampling and a rated voltage standard sine value corresponding to the position of the voltage in the sine array;

s202, judging whether the ratio of the absolute value of the voltage deviation to the standard sine value of the rated voltage is larger than a set allowable proportion fixed value of the voltage-shaking deviation, if so, enabling a tangent timing identification bit t1+ +, and if not, enabling a tangent timing identification bit t1 to be 0;

s203, when the ratio of the tangent timing identification position t1 to the control frequency of the controller is larger than the allowable fixed value of the electricity interference deviation time, controlling the normally open node of the electromagnetic relay to be closed;

s204, when the ratio of the tangent timing identification position t1 to the control frequency of the controller is larger than the set closing delay time t of the solid-state switch_{Fixing device}When the alternating current is used for supplying power, the solid-state switch is controlled to be closed, so that the coil of the contactor is switched to be supplied with power by the anti-interference module from the original alternating current power supply.

4. The method of claim 4, wherein the allowable proportion of the voltage of the brown-out deviation in step S202 is set to an effective value of the rated voltage of the contactor coilThe allowable fixed value of the electricity interference deviation time in the step S203 is 2-3 ms, and the closing delay time of the solid-state switch in the step S204 is 4-6 ms.

5. The method according to claim 1, wherein the step S300 of determining the loss of interference specifically includes:

s301, after a contactor coil is switched to an anti-interference electricity module to supply electricity, judging whether the ratio of the absolute value of voltage deviation to the standard sine value of rated voltage is smaller than a set interference recovery voltage deviation allowable proportion fixed value or not, if so, enabling an anti-interference timing identification bit q + + and otherwise, enabling the anti-interference timing identification bit q to be 0;

s302, when the ratio of the anti-cutting timing identification position to the control frequency of the controller is larger than the power interference recovery determination time fixed value, determining that power interference disappears, and entering anti-cutting time sequence control;

and S303, when the ratio of the back cut timing identification bit to the control frequency of the controller is greater than the back cut limit time fixed value, entering into overrun control.

6. The method as claimed in claim 5, wherein the allowable proportion of the voltage deviation of the voltage for restoring the voltage during the step S301 is not less than the effective value of the rated voltage of the coil of the contactorThe voltage interference recovery voltage deviation allowable proportion fixed value is smaller than a set voltage interference deviation allowable proportion fixed value; the fixed value of the power-shaking recovery determination time in the step S302 is notAnd (4) less than 2-5 ms, wherein the backward cutting limited time constant value in the step (S303) is not more than 10S.

7. The method according to claim 1, wherein the inverse cutting timing control in step S400 specifically comprises:

s401, calculating the position of a control period where the estimated voltage is located after the backward switching is finished to be k + t_{Fixing device}*f_s；

S402, judging the position of the sine table where the current voltage is located, and predicting the position SIN [ k + t ] of the sine table where the voltage is located after the backward cutting is finished_{Fixing device}*f_s]Increasing period reverse cut voltageBack cut voltage of decreasing periodThe relationship of (1):

if the voltage is at the position of the sine array, the corresponding rated voltage standard sine value SIN (k) is at the first quadrant and meets the requirementλ₁If the voltage proportionality coefficient is the reverse switching voltage proportionality coefficient in the increment period, outputting a normally open node closing instruction and a solid-state switch separating instruction of the electromagnetic relay, otherwise, circularly waiting until the normally open node closing instruction and the solid-state switch separating instruction are met;

if the voltage is positioned at the position of the sine array, the corresponding rated voltage standard sine value SIN (k) is positioned in the second quadrant and meets the requirementλ₂If the voltage proportionality coefficient is the reverse switching voltage proportionality coefficient in the decreasing period, outputting a normally open node closing instruction and a solid-state switch separating instruction of the electromagnetic relay, otherwise, circularly waiting until the normally open node closing instruction and the solid-state switch separating instruction are met;

if the voltage is positioned at the position of the sine array, the corresponding rated voltage standard sine value SIN (k) is positioned in the third quadrant and meets the requirementOutputting a normally open node closing instruction and a solid-state switch separating instruction of the electromagnetic relay, otherwise, circularly waiting until the normally open node closing instruction and the solid-state switch separating instruction are met;

if the voltage is positioned in the sine array position, the corresponding rated voltage standard sine value SIN (k) is positioned in the fourth quadrant and meets the requirementAnd outputting a normally open node closing instruction and a solid-state switch separation instruction of the electromagnetic relay, otherwise, circularly waiting until the normally open node closing instruction and the solid-state switch separation instruction are met.

8. The method according to claim 1, wherein the overrun control in step S500 includes:

s501, detecting voltages at two ends of an energy storage capacitor bank;

s502, judging whether the detected voltage at two ends of the energy storage capacitor bank is less than 50% of the rated voltage of the energy storage capacitor bank, if so, enabling an overrun timing identification bit J + +, and otherwise, enabling the overrun timing identification bit J to be 0;

and S503, when the ratio of the over-limit timing identification bit to the control frequency of the controller is greater than the over-limit time, controlling the normally-open node closing instruction of the electromagnetic relay to be separated from the solid-state switch.

9. The method according to claim 9, wherein the overrun time in step S503 is not less than 1-2 ms.

10. An anti-interference electricity module is characterized by comprising a controller (1), an electromagnetic relay (2), a solid-state switch (3), an energy storage capacitor bank (4), an AC/DC switching power supply (5), a DC/DC power supply (6), a voltage conversion chip (7), a voltage sampler (8) and a state detector (9), wherein the input end and the output end of the AC/DC switching power supply (5) are respectively and electrically connected with a power grid and the input end of the energy storage capacitor bank (4), one output end of the energy storage capacitor bank (4) is electrically connected with the controller (1) through the voltage conversion chip (7), and the other output end of the energy storage capacitor bank is electrically connected with the input end of the DC/DC power supply (6); the output end of the DC/DC power supply (6) is provided with a direct current supply loop (10) connected with a power grid, and a normally open contact J2 of the solid-state switch (3) is connected in series on the direct current supply loop (10); the input end and the output end of the voltage sampler (8) and the state detector (9) are respectively in signal connection with the power grid and the controller (1), and the voltage sampler (8) samples the input voltage of the power grid in real time and transmits the input voltage to the controller (1); the output end of the controller (1) is in signal connection with the electromagnetic relay (2) and the solid-state switch (3), and the electromagnetic relay (2) comprises normally closed contacts J1A and J1D which are arranged on the power grid to connect the power grid (10) and the contactor (12), and normally open contacts J1B and J1C which are connected in series on the direct-current power supply loop (10);

wherein the controller (1) comprises:

the standard sine value calculation module of the rated voltage is used for calculating the standard sine value of the rated voltage according to the effective value of the rated voltage of the coil of the contactor;

the power interference judging and tangent time sequence control module is used for judging whether power interference occurs according to the voltage deviation of actual sampling, and controlling the contactor coil to be switched from the power supply of the alternating current power supply to the power supply of the anti-power interference module after the power interference occurs;

the interference electricity disappearance judgment module is used for judging whether interference electricity disappears or not according to the actually sampled voltage deviation after the contactor coil is switched to the anti-interference electricity module to supply power;

the reverse switching time sequence control module is used for controlling the coil of the contactor to be switched to be supplied with power by an alternating current power supply from the anti-interference module after the interference disappears and the interference recovery time reaches a reverse switching limited time fixed value;

and the overrun control module is used for forcibly controlling the anti-interference module to switch back to the alternating current power supply for supplying power after the power supply capacity of the anti-interference module is exceeded.

Technical Field

The invention belongs to the technical field of power supply protection of an electric power system, and particularly relates to a switching control method of an anti-interference module and the anti-interference module.

Background

At present, with the rapid development of economic society, various types of equipment are gradually increased in national economy production and life. In particular, in recent years, a number of high-precision devices have been increasing. The industrial and agricultural production and living equipment is particularly sensitive to the quality of electric energy, particularly to the problem of voltage interference, and once the voltage interference occurs, huge economic loss is caused. For example, electronic devices having storage media, such as computers and servers, which are widely used in production and life, may cause problems such as overheating, data loss, and incomplete data storage when power failure occurs; in the chip manufacturing industry of the 'neck card', once the electricity interference occurs, the problem of the batch quality of semiconductor devices is caused; in the field of PLC control, the problems of incapability of maintaining nodes, program loss and the like can be caused after electricity interference occurs; in the automatic control field of spraying paint, in case take place to shake the electricity, can cause the paint spraying inequality, the colour is inconsistent, and then causes the batch quality problem.

In particular, in the control systems of motors and pumps which are widely applied in China and other industrial control loops, the contactor has been widely and largely applied. However, when the contactor faces the problem of power dazzling, the power failure or incapability of maintaining the coil of the contactor occurs, so that the control failure of a node loop is caused, and further, the problems of alarm and failure, such as power failure of a motor, stop of operation of pumps and the like, are caused; the head knocking machine stops working in the oil refining industry, the pump control fails in the chemical industry, a large number of industrial production accidents are caused, and a large amount of time and manpower are consumed for re-electrifying the control loops of the motors and the pumps with a large number, so that a large amount of economic loss is caused.

Conventionally, in the field of anti-interference of a contactor, dual-control power supplies are often used as a backup mode, but the dual-control power supplies are limited by the problem of power supply switching speed, and interference is fast, so that power supply at interference time cannot be guaranteed sometimes due to dual-power supply switching. There is also a method of using an online UPS to control the power supply, but the online UPS is expensive and bulky, and requires a special installation space and budget for installation. The bulk becomes a problem limiting the use of this solution when retrofitting existing lines. The UPS supplies power to the whole control system, so that the power required to be configured is large, and energy storage batteries are required to be configured in some occasions, so that the cost and the volume of the UPS scheme are further improved, and the UPS becomes an important factor for limitation in application.

Disclosure of Invention

In order to solve the problems in the prior art, the invention provides a switching control method which can solve the problem of tripping caused by power grid interference and has high control reliability, high logic integrity and applicability and can prolong the service life of an anti-interference power module, and the anti-interference power module based on the switching control method.

In order to solve the technical problems, the invention adopts the following technical scheme:

the invention provides a switching control method of an anti-interference module, which comprises the following steps:

s100, calculating a standard sine array of rated voltage, and calculating to obtain the standard sine array of the rated voltage according to the effective value of the rated voltage of the coil of the contactor;

s200, judging power interference and performing tangent time sequence control, calculating voltage deviation according to the actually sampled terminal voltage of the contactor coil, judging whether power interference occurs, and controlling the contactor coil to be switched from an alternating current power supply to an anti-power interference module to supply power after the power interference occurs;

s300, judging whether the electric dazzling disappears or not, wherein after the contactor coil is switched to the anti-dazzling module to supply power, voltage deviation is calculated according to the actually sampled terminal voltage of the contactor coil to judge whether the electric dazzling disappears or not;

s400, reverse switching time sequence control, wherein after the electric dazzling disappears and the electric dazzling recovery time reaches a reverse switching limited time fixed value, the coil of the contactor is controlled to be switched to be supplied with power by an alternating current power supply through an anti-dazzling module;

s500, performing out-of-limit control, namely forcibly controlling the anti-interference module to switch back to the alternating current power supply to supply power after the power supply capacity of the anti-interference module is exceeded.

Further, the "nominal voltage standard sine value calculation" in step S100 specifically includes:

s101, the effective value of the rated voltage of the contactor coil is V_{N_RMS}And then establishing a rated voltage standard sine array according to a formula:wherein sin () is a sine function; k is the current control period of the controller, and k is more than or equal to 0 and less than or equal to M; m is the number of array elements, and M ═ f_s/50，f_sIs the control frequency of the controller;

s102: performing phase-locked calculation on the terminal voltage of the contactor coil to obtain the current phase theta of the voltage;

s103: at the current control period time k, the rated voltage standard sine value of the position of the terminal voltage of the contactor coil in the sine array is SIN [ k ]]Wherein0≤θ≤2π。

Further, the "power-on-interference determination and tangent timing control" in the step S200 specifically includes:

s201, calculating to obtain voltage deviation according to the terminal voltage obtained by actual sampling and a rated voltage standard sine value corresponding to the position of the voltage in the sine array;

s202, judging whether the ratio of the absolute value of the voltage deviation to the standard sine value of the rated voltage is larger than a set allowable proportion fixed value of the voltage-shaking deviation, if so, enabling a tangent timing identification bit t1+ +, and if not, enabling a tangent timing identification bit t1 to be 0;

s203, when the ratio of the tangent timing identification position t1 to the control frequency of the controller is larger than the allowable fixed value of the electricity interference deviation time, controlling the normally open node of the electromagnetic relay to be closed;

s204, when tangentThe ratio of the timing identification position t1 to the control frequency of the controller is larger than the set closing delay time t of the solid-state switch_{Fixing device}When the alternating current is used for supplying power, the solid-state switch is controlled to be closed, so that the coil of the contactor is switched to be supplied with power by the anti-interference module from the original alternating current power supply.

Further, the allowable voltage ratio of the voltage at the brown-out deviation in the step S202 is set to an effective value of the rated voltage of the contactor coilThe allowable fixed value of the electricity interference deviation time in the step S203 is 2-3 ms, and the closing delay time of the solid-state switch in the step S204 is 4-6 ms.

Further, the "electric-dazzling disappearance determination" specifically includes:

s301, after a contactor coil is switched to an anti-interference electricity module to supply electricity, judging whether the ratio of the absolute value of voltage deviation to the standard sine value of rated voltage is smaller than a set interference recovery voltage deviation allowable proportion fixed value or not, if so, enabling an anti-interference timing identification bit q + + and otherwise, enabling the anti-interference timing identification bit q to be 0;

s302, when the ratio of the anti-cutting timing identification position to the control frequency of the controller is larger than the power interference recovery determination time fixed value, determining that power interference disappears, and entering anti-cutting time sequence control;

and S303, when the ratio of the back cut timing identification bit to the control frequency of the controller is greater than the back cut limit time fixed value, entering into overrun control.

Further, the fixed value of the allowable proportion of the voltage swing recovery deviation in the step S301 is not less than the effective value of the rated voltage of the contactor coilThe voltage interference recovery voltage deviation allowable proportion fixed value is smaller than a set voltage interference deviation allowable proportion fixed value; the fixed value of the current interference recovery determination time in the step S302 is not less than 2-5 ms, and the fixed value of the back cut limit time in the step S303 is not more than 10S.

Further, the cut-back timing control is a cut-back logic control, including:

s401, calculating the position of a control period where the estimated voltage is located after the backward switching is finished to be k + t_{Fixing device}*f_s；

S402, judging the position of the sine table where the current voltage is located, and predicting the position SIN [ k + t ] of the sine table where the voltage is located after the backward cutting is finished_{Fixing device}*f_s]Increasing period reverse cut voltageBack cut voltage of decreasing periodThe relationship of (1);

if the voltage is at the position of the sine array, the corresponding rated voltage standard sine value SIN (k) is at the first quadrant and meets the requirementλ₁If the voltage proportionality coefficient is the reverse switching voltage proportionality coefficient in the increment period, outputting a normally open node closing instruction and a solid-state switch separating instruction of the electromagnetic relay, otherwise, circularly waiting until the normally open node closing instruction and the solid-state switch separating instruction are met;

if the voltage is positioned at the position of the sine array, the corresponding rated voltage standard sine value SIN (k) is positioned in the second quadrant and meets the requirementλ₂If the voltage proportionality coefficient is the reverse switching voltage proportionality coefficient in the decreasing period, outputting a normally open node closing instruction and a solid-state switch separating instruction of the electromagnetic relay, otherwise, circularly waiting until the normally open node closing instruction and the solid-state switch separating instruction are met;

if the voltage is positioned at the position of the sine array, the corresponding rated voltage standard sine value SIN (k) is positioned in the third quadrant and meets the requirementOutputting a normally open node closing instruction and a solid-state switch separating instruction of the electromagnetic relay, otherwise, circularly waiting until the normally open node closing instruction and the solid-state switch separating instruction are met;

if the voltage is positioned in the sine array position, the corresponding rated voltage standard sine value SIN (k) is positioned in the fourth quadrant and meets the requirementAnd outputting a normally open node closing instruction and a solid-state switch separation instruction of the electromagnetic relay, otherwise, circularly waiting until the normally open node closing instruction and the solid-state switch separation instruction are met.

Preferably, the ramp-up phase counter-cut voltage scaling factor λ₁Not less than 0.7, and the inverse cutting voltage proportionality coefficient lambda of the decreasing period₂Not less than 0.85.

Further, the overrun control includes:

s501, detecting voltages at two ends of an energy storage capacitor bank;

s502, judging whether the detected voltage at two ends of the energy storage capacitor bank is less than 50% of the rated voltage of the energy storage capacitor bank, if so, enabling an overrun timing identification bit J + +, and otherwise, enabling the overrun timing identification bit J to be 0;

and S503, when the ratio of the over-limit timing identification bit to the control frequency of the controller is greater than the over-limit time, controlling the normally-open node closing instruction of the electromagnetic relay to be separated from the solid-state switch.

Further, the overrun time in the step S503 is not less than 1-2 ms.

The invention also provides an anti-interference electricity module which comprises a controller, an electromagnetic relay, a solid-state switch, an energy storage capacitor bank, an AC/DC switching power supply, a DC/DC power supply, a voltage conversion chip, a voltage sampler and a state detector, wherein the input end and the output end of the AC/DC switching power supply are respectively and electrically connected with the power grid and the input end of the energy storage capacitor bank; the output end of the DC/DC power supply is provided with a direct current supply loop connected with a power grid, and a normally open contact J2 of the solid-state switch is connected in series on the direct current supply loop; the input end and the output end of the voltage sampler and the state detector are respectively in signal connection with the power grid and the controller, and the voltage sampler samples the input voltage of the power grid in real time and transmits the input voltage to the controller; the output end of the controller is in signal connection with an electromagnetic relay and a solid-state switch, and the electromagnetic relay comprises normally closed contacts J1A and J1D which are arranged on a power grid to connect the power grid and a contactor, and normally open contacts J1B and J1C which are connected in series on a direct-current power supply loop;

wherein the controller includes:

the standard sine value calculation module of the rated voltage is used for calculating the standard sine value of the rated voltage according to the effective value of the rated voltage of the coil of the contactor;

the power interference judging and tangent time sequence control module is used for judging whether power interference occurs according to the voltage deviation of actual sampling, and controlling the contactor coil to be switched from the power supply of the alternating current power supply to the power supply of the anti-power interference module after the power interference occurs;

the interference electricity disappearance judgment module is used for judging whether interference electricity disappears or not according to the actually sampled voltage deviation after the contactor coil is switched to the anti-interference electricity module to supply power;

the reverse switching time sequence control module is used for controlling the coil of the contactor to be switched to be supplied with power by an alternating current power supply from the anti-interference module after the interference disappears and the interference recovery time reaches a reverse switching limited time fixed value;

and the overrun control module is used for forcibly controlling the anti-interference module to switch back to the alternating current power supply for supplying power after the power supply capacity of the anti-interference module is exceeded.

The invention has the beneficial effects that:

through the technical scheme, the problem that the contactor on the power grid is subjected to electric shock and tripping is effectively solved, the control reliability in industrial and agricultural production and life is improved, the impact current of a contactor coil is considered in the switching process, the relay and the solid-state switch have a specific control sequence, the service life of the anti-electric-shock module is prolonged, the bidirectional switching logic is clear, the overrun control under the power supply or power failure problem is considered, the logic integrity is high, meanwhile, each parameter in the anti-electric-shock process can be set according to different working conditions in the application process, the applicability is higher, and the application is wider.

Drawings

Fig. 1 is a flowchart illustrating an embodiment of a handover control method of an anti-interference module according to the present invention;

figure 2 is a schematic structural view of an embodiment of an anti-glare module of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

As shown in fig. 1, a switching control method of an anti-interference electric module according to an embodiment of the present invention includes the following steps:

and S100, calculating a standard sine array of the rated voltage, and calculating to obtain the standard sine array of the rated voltage according to the effective value of the rated voltage of the coil of the contactor. The method specifically comprises the following steps:

s101, the effective value of the rated voltage of the contactor coil is V_{N_RMS}And then establishing a rated voltage standard sine array according to a formula:wherein sin () is a sine function; k is the current control period of the controller, and k is more than or equal to 0 and less than or equal to M; m is the number of array elements, and M ═ f_s/50，f_sIs the control frequency of the controller;

s102: performing phase-locked calculation on the terminal voltage of the contactor coil to obtain the current phase theta of the voltage;

s103: at the current control period time k, the rated voltage standard sine value of the position of the terminal voltage of the contactor coil in the sine array is SIN [ k ]]Wherein0≤θ≤2π。

S200, judging power interference and performing tangent sequence control, calculating voltage deviation according to the actually sampled terminal voltage of a contactor coil, judging whether power interference occurs, and controlling the contactor coil to be switched from an alternating current power supply to an anti-power interference module to supply power after the power interference occurs; the method specifically comprises the following steps:

s201, obtaining a terminal voltage V according to actual sampling_realCorresponding to the position of the voltage within the sine arrayRated voltage standard sine value, calculating voltage deviation DeltaV, i.e. DeltaV is equal to V_real-SIN(k)；

S202, judging the absolute value of the voltage deviation delta V and the standard sine value SIN [ k ] of the rated voltage]Whether the ratio of (A) is greater than a set allowable proportion voltage V of the interference deviation_ShakingPercent (i.e.:) If yes, let the tangent timing flag t1+ +, otherwise, let the tangent timing flag t1 be 0; wherein the voltage-to-interference deviation allowable proportion is set as V_Shaking% preferably effective value V of rated voltage of contactor coil_{N_RMS}Is/are as follows

S203, when the ratio of the tangent timing identification position t1 to the control frequency of the controller is larger than the electric dazzling deviation time allowable fixed value t_Shaking(namely:) When the electromagnetic relay is started, the normally open node of the electromagnetic relay is controlled to be closed; the allowable fixed value of the electricity interference deviation time is preferably 2-3 ms, and the closing delay time of the solid-state switch is preferably 4-6 ms;

s204, when tangent, timing identification position t1 and control frequency f of controller_sIs greater than the set closing delay time t of the solid-state switch_{Fixing device}(namely:) When the alternating current is used for supplying power, the solid-state switch is controlled to be closed, so that the coil of the contactor is switched to be supplied with power by the anti-interference module from the original alternating current power supply.

And S300, judging whether the electric dazzling disappears or not, wherein after the contactor coil is switched to the anti-dazzling module to supply power, the voltage deviation delta V is calculated according to the actually sampled terminal voltage of the contactor coil.

The method specifically comprises the following steps:

s301, after the coil of the contactor is switched to the anti-interference module to supply power, judging the voltageDeviation delta V from the standard sine value SIN [ k ] of the nominal voltage]Whether the ratio is less than a set interference recovery voltage deviation allowable proportion fixed value V_{Recovering process}Percent (i.e.:) If yes, making the back cut timing identification bit q + +, otherwise, making the back cut timing identification bit q equal to 0; wherein, the voltage deviation allowable proportion fixed value V of the electric dazzling recovery_{Recovering process}% preferably not less than the effective value of the rated voltage of the coil of the contactorAnd the voltage deviation allowable proportion fixed value V of the voltage swing recovery_{Recovering process}% less than set allowable proportion voltage V_Shaking% (i.e.: V)_{Recovering process}％＜V_Shaking％)；

S302, when the counter-cut is performed, the identification bit q and the control frequency f of the controller are determined_sIs greater than the fixed value t of the power-on-state recovery determination time_{Recovering process}(namely:) Judging that the interference electricity disappears, and entering the step S400. carrying out inverse cutting sequence control; wherein the power-shaking recovery determination time constant value t_{Recovering process}Preferably not less than 2-5 ms;

s303, when the counter-cut is timed, the identification bit q and the control frequency f of the controller are marked_sIs greater than the back-cut limit time constant t_{Limit of}(namely:) Then, the step S500 is entered for overrun control; wherein the backstepping limit time constant value is preferably not less than 10 s.

S400, reverse cutting sequence control is carried out, after the electric interference disappears, the electric interference recovery time reaches a reverse cutting limit time fixed value t_{Limit of}When the alternating current is used, the coil of the control contactor is switched to be supplied with the alternating current power supply by the anti-interference module; specifically, the back cut sequence control is a back cut logic control including:

s401, calculating and predicting voltage station after reverse cutting is completedControl period position (k + t)_{Fixing device}*f_s)；

S402, judging the quadrant sum SIN [ k + t ] where the rated voltage standard sine value SIN (k) of the voltage at the position of the sine table is located_{Fixing device}*f_s]Andto determine whether to control the normally open node of the electromagnetic relay to close and the solid state switch to open; the method specifically comprises the following steps:

if the voltage is in the sine table position, the rated voltage standard sine value SIN (k) is in the first quadrant and meets the requirementλ₁If the voltage proportionality coefficient is the reverse switching voltage proportionality coefficient in the increment period, outputting a normally open node closing instruction and a solid-state switch separating instruction of the electromagnetic relay, otherwise, circularly waiting until the normally open node closing instruction and the solid-state switch separating instruction are met;

if the voltage is in the sine table position, the rated voltage standard sine value SIN (k) is in the third quadrant and meets the requirementOutputting a normally open node closing instruction and a solid-state switch separating instruction of the electromagnetic relay, otherwise, circularly waiting until the normally open node closing instruction and the solid-state switch separating instruction are met;

if the voltage is in the sine table position, the rated voltage standard sine value SIN (k) is in the second quadrant and meets the requirementλ₂If the voltage proportionality coefficient is the reverse switching voltage proportionality coefficient in the decreasing period, outputting a normally open node closing instruction and a solid-state switch separating instruction of the electromagnetic relay, otherwise, circularly waiting until the normally open node closing instruction and the solid-state switch separating instruction are met;

if the voltage is in the sine table position, the rated voltage standard sine value SIN (k) is in the fourth quadrant and meets the requirementNormally open node closing finger of output electromagnetic relayThe command is separated from the solid-state switch, otherwise, the command is circularly waited until the command is met;

furthermore, the ramp-up period counter-cut voltage scaling factor λ₁Preferably not less than 0.7, and the inverse cutting voltage proportionality coefficient lambda of the decreasing period₂Preferably not less than 0.85. When the voltage waveforms of the first quadrant and the third quadrant are increasing in magnitude, and t_{Fixing device}After the circuit is switched on by time, a larger value is supplied to a coil of the contactor immediately, so that no tripping is guaranteed; when the voltage waveform values of the second quadrant and the fourth quadrant are reduced, the voltage peak value after switching-on is still not less than 85% of the rated voltage, and even if the voltage is reduced, the power can be supplied to the coil of the contactor for a period of time to finish pull-in maintenance; i.e. lambda₁The threshold value of the measure being lower than lambda₂And because the voltage waveforms of the first quadrant and the third quadrant are in an increasing stage, the charging is always carried out after the lower numerical value is cut back, the voltage waveforms of the second quadrant and the fourth quadrant are in a decreasing stage, and after the higher numerical value is cut back, enough time is left for charging the coil of the contactor to keep attracting.

And S500, performing out-of-limit control, namely forcibly controlling the anti-interference module to switch back to the alternating current power supply to supply power after the power supply capacity of the anti-interference module is exceeded. The method specifically comprises the following steps:

s501, detecting voltages at two ends of an energy storage capacitor bank;

s502, judging whether the detected voltage at two ends of the energy storage capacitor bank is less than 50% of the rated voltage of the energy storage capacitor bank, if so, enabling an overrun timing identification bit J + +, and otherwise, enabling the overrun timing identification bit J to be 0;

s503, when the over-limit timing identification bit J and the control frequency f of the controller_sIs greater than the overrun time t_Super-super(namely:) When the electromagnetic relay is started, a normally open node closing instruction of the electromagnetic relay is controlled to be separated from a solid-state switch; wherein the overrun time is preferably not less than 1-2 ms.

As shown in fig. 2, the anti-interference module according to the embodiment of the present invention includes a controller 1, an electromagnetic relay 2, a solid-state switch 3, an energy storage capacitor bank 4, an AC/DC switching power supply 5, a DC/DC power supply 6, a voltage conversion chip 7, a voltage sampler 8, and a state detector 9, wherein an input end and an output end of the AC/DC switching power supply 5 are electrically connected to a power grid and an input end of the energy storage capacitor bank 4, respectively, one output end of the energy storage capacitor bank 4 is electrically connected to the controller 1 through the voltage conversion chip 7, and the other output end is electrically connected to an input end of the DC/DC power supply 6; the output end of the DC/DC power supply 6 is provided with a direct current supply loop 10 connected with a power grid, and a normally open contact J2 of the solid-state switch 3 is connected on the direct current supply loop 10 in series; the input end and the output end of the voltage sampler 8 and the state detector 9 are respectively in signal connection with the power grid and the controller 1, and the voltage sampler 8 samples the input voltage of the power grid in real time and transmits the voltage to the controller 1; the output end of the controller 1 is in signal connection with the electromagnetic relay 2 and the solid-state switch 3, and the electromagnetic relay 2 comprises normally closed contacts J1A and J1D which are arranged on the power grid to connect the power grid 10 and the contactor 12, and normally open contacts J1B and J1C which are connected in series on the direct-current power supply loop 10;

wherein the controller 1 includes:

the rated voltage standard sine value calculation module 11 is used for calculating a standard sine value of a rated voltage according to a rated voltage effective value of a contactor coil;

the power interference judging and tangent time sequence control module 12 is used for judging whether power interference occurs according to the voltage deviation of actual sampling, and controlling the contactor coil to be switched from the power supply of the alternating current power supply to the power supply of the anti-power interference module after the power interference occurs;

the interference electricity disappearance judgment module 13 is configured to judge whether interference electricity disappears according to a voltage deviation of actual sampling after the contactor coil is switched to the anti-interference electricity module to supply power;

the reverse switching time sequence control module 14 is used for controlling the contactor coil to be switched to be powered by an alternating current power supply from the anti-interference module after the interference disappears and the interference recovery time reaches a reverse switching limited time fixed value;

and the overrun control module 15 is used for forcibly controlling the anti-interference module to switch back to the alternating current power supply for supplying power after the power supply capacity of the anti-interference module is exceeded.

The switching control method of the anti-interference electricity module can effectively solve the problem that the contactor on the power grid is subjected to interference electricity to cause tripping, improves the reliability of control in industrial and agricultural production and life, considers the impact current of the coil of the contactor in the switching process, has a specific control sequence between the relay and the solid-state switch, prolongs the service life of the anti-interference electricity module, has clear bidirectional switching logic, considers the overrun control under the power supply or power failure problem, has strong logic integrity, can set various parameters in the anti-interference electricity process aiming at different working conditions in the application process, and has stronger applicability and wider application.

While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.