CN103611631B - High-frequency high-voltage electrostatic dust removal power control system and method - Google Patents

High-frequency high-voltage electrostatic dust removal power control system and method Download PDF

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Publication number
CN103611631B
CN103611631B CN201310573698.1A CN201310573698A CN103611631B CN 103611631 B CN103611631 B CN 103611631B CN 201310573698 A CN201310573698 A CN 201310573698A CN 103611631 B CN103611631 B CN 103611631B
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China
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voltage
flashover
value
current
resonance
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CN201310573698.1A
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CN103611631A (en
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曾庆军
章飞
杨炜
牟晋力
仇家胜
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江苏科技大学
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Abstract

The invention discloses a kind of High-frequency high-voltage electrostatic dust removal power control system and method, described power control system is using DSP as system core controller, external input signal is divided into analog quantity and digital quantity input, analog input signal directly inputs DSP through part of data acquisition, digital quantity input signal carries out inputting DSP again after logical process through CPLD, the control signal that DSP exports also carries out exporting after logical process through CPLD, and the communication between power-supply system and host computer is realized by RS232/485 and CAN communication mode.Described control method mainly comprises secondary current voltage flashover determination methods, resonance current flashover determination methods, best flashover strike control method.The present invention can according to the change of load in real time and the effective power supply that controls export, under the prerequisite ensureing power good reliably working, improve power-efficient, obtain good dust removing effects.

Description

High-frequency high-voltage electrostatic dust removal power control system and method
Technical field
The present invention relates to a kind of electrostatic precipitation system, particularly relate to a kind of control system and control method of High-frequency high-voltage electrostatic dust removal power.
Background technology
Along with the high speed development of modern industry, air pollution is on the rise, in control flue gas particle pollutant emission, high-voltage electrostatic dust separator has that efficiency of dust collection is high, energy consumption is little, process dust granules wide ranges and operating automation degree high are widely used.High-frequency and high-voltage power supply is the core of high-voltage electrostatic dust separator, the difference of its power supply mode, the method for operation and control mode thereof, on the efficiency of dust collection of electrostatic precipitator and operation stability, there is important impact, and comprehensive, stable power control system is the basis ensureing the stable operation of electrostatic precipitation high voltage source, in addition, power control system also needs to have parameter prediction, fault diagnosis and remote monitoring function, remote computer access database server and supervisory control comuter can be realized, and can place remote debugging control be carried out.The control system of electrostatic precipitation high voltage source comprises power protection and controls and power work Characteristics Control; the protecting control of power supply mainly prevents from occurring over-voltage and over-current in circuit working; ensure that power supply can normally run, power work Characteristics Control mainly controls in conjunction with the operating characteristic that electrostatic precipitator is special.The prior control be its operating characteristic of static dust-removing power control system, need to improve output voltage during power good work, as far as possible close to flashover voltage, output voltage ripple is little simultaneously, accurately and rapidly detecting flashover and processing is the key improving efficiency of dust collection, by expecting that to flashover output voltage climbing speed controls after time of occurrence and flashover next time, reach the object improving electrostatic power sources efficiency of dust collection.In order to improve efficiency of dust collection as far as possible, occur that the number of times of flashover also will increase, therefore also require that power supply possesses the ability of anti-frequent short circuit reliably and perfect defencive function.So power control system should be able to according to the change of load in real time and the effective power supply that controls export, make efficiency of dust collection reach best.Reach the object improving electrostatic power sources efficiency of dust collection; need the flashover determination methods to High-frequency high-voltage electrostatic dust removal power, best flashover strike control method, system protection method, serious flashover and arcing processing method, and size fault handling method and the under-voltage processing method of output etc. carry out Improvement.
Summary of the invention
The object of the present invention is to provide a kind of High-frequency high-voltage electrostatic dust removal power control system and method, make high-frequency and high-voltage power supply can meet the power demands of Large Copacity electrostatic precipitator under different working condition.
Object of the present invention is achieved by the following technical programs:
A kind of High-frequency high-voltage electrostatic dust removal power control system, comprises DSP1, collecting part 2, CPLD3, communications portion 4, external input signal is divided into analog input signal and digital quantity input signal, and described analog input signal comprises inlet wire current signal, bus voltage signal, primary side current and resonance current signal, secondary current voltage signal, a secondary side current integrated signal, temperature of oil in transformer signal, ambient temperature signal, described digital quantity input signal comprises 4 road IGBT malfunction feedback quantity input signals, zero passage detection signal, primary side over-current signal, 18 line state feedback signals, described analog input signal inputs DSP1 through part of data acquisition 2, described digital quantity input signal carries out inputting DSP1 after logical process through CPLD3, the control signal that DSP1 exports carries out exporting after logical process through CPLD3, and the switching signal that the digital output part that CPLD3 exports comprises a secondary side current integration exports, 12 road relay control signals export and pwm signal exports, and the communication between High-frequency high-voltage electrostatic dust removal power control system and host computer is realized by RS232/485 and CAN communication mode.
A secondary current voltage flashover determination methods for High-frequency high-voltage electrostatic dust removal power control system, comprising:
1) sampling secondary current voltage, judge whether secondary voltage sampled value is less than the half of secondary voltage setting value, secondary voltage setting value gets 60KV ~ 80KV according to the situation of actual electric field;
2) if step 1) comparative result be yes, then judge whether secondary current sampled value is greater than the K of secondary current setting value doubly, wherein, secondary current preset value gets 1.1 ~ 1.3 times of secondary current sample mean when actual electric field normally works, and the value of K gets 1.5 ~ 3 according to the characteristic of actual electric field;
3) if step 2) comparative result for being greater than, then think and generation flashover flashover number of times added one; If comparative result is for being less than, return step 1);
4) if step 1) judged result be no, secondary voltage sampled value and a front secondary voltage value are carried out the secondary voltage accumulated value that adds up to obtain, and preset value 1 assignment that added up by secondary voltage to add up preset value 2 to secondary voltage, secondary voltage accumulated value assignment to add up preset value 1 to secondary voltage;
5) judge whether secondary voltage accumulated value is less than secondary voltage and adds up the half of preset value 1, judge whether secondary voltage accumulated value is less than secondary voltage and adds up the half of preset value 2;
6) if step 5) comparative result in have one to be yes, then think and generation flashover flashover number of times added one;
7) if step 5) comparative result be no, preset value 1 assignment that then added up by secondary voltage to add up preset value 2 to secondary voltage, secondary voltage accumulated value assignment to add up preset value 1 to secondary voltage, and by the zero setting of secondary voltage accumulated value, program returns and enters next loop cycle.
A kind of resonance current flashover determination methods of High-frequency high-voltage electrostatic dust removal power control system is as follows:
1) sampling harmonic electric current, judge whether a resonant process terminates, if terminated, resonance current is added 2 with resonance current preset value and compares, wherein, resonance current preset value gets 1.1 ~ 1.3 times of resonance current sample mean when actual electric field normally works, if comparative result is for being greater than, being judged as that flashover occurs, carrying out flashover process;
2) if step 1) a resonant process terminate, resonance current and resonance current preset value add 2 results compared for being less than, then upgrade all preset values, add up to resonance current value assignment to corresponding preset value by current forward and reverse resonance current peak value, oppositely resonance peak, and return;
3) if step 1) judge that resonant process does not terminate, then resonance time is increased 1 certainly, then judge it is forward resonance or reverse resonance;
4) if be judged as forward resonance, then judge whether forward resonance peak is greater than 1.5 times of preset value, preset value generally gets normal resonance current peak value, if comparative result is for being greater than, being judged as that flashover occurs, carrying out flashover process;
5) if step 4) comparative result for being less than, then judge forward resonance current integration more whether between bound, the upper limit generally gets 1.5 times of normal resonance current integration, lower limit generally gets 1.2 times of normal resonance current integration, if between bound, be judged as that flashover occurs, carry out flashover process; If not between bound, return;
6) if step 3) be judged as reverse resonance, then compare 1.5 times of reverse resonance peak and preset value, preset value generally gets normal resonance current peak value, if comparative result is for being greater than, being judged as that flashover occurs, carrying out flashover process; If comparative result is for being less than then cumulative reversing the current absolute value, absolute value by reverse resonance current peak value is added with the absolute value of the reverse resonance current peak value of previous moment, with preset value 1.5 times of value after cumulative are compared, preset value is generally got normal oppositely resonance current peak value and is multiplied by reverse resonance current peak value accumulative frequency, if comparative result is for being greater than, be judged as that flashover occurs, carry out flashover process, if comparative result is for being less than, program returns.
A kind of best flashover strike control method of High-frequency high-voltage electrostatic dust removal power control system is as follows:
1) time timeA, timeB and timeC of secondary voltage rising three phases is calculated according to flashover strike, the three phases that secondary voltage rises is three typical phases restored electricity after there is flashover, calculates critical voltage riseA, riseB and riseC of secondary voltage rising three phases according to flashover voltage; The calculating of timeA, timeB and timeC and critical voltage riseA, riseB and riseC is that the three slope flashover tracing figures drawn according to flashover strike calculate;
2) according to rate of voltage rise slopA, slopB and slopC of timeA, timeB, timeC and riseA, riseB, riseC calculating secondary voltage rising three phases, namely electricity consumption presses rising amount and obtains divided by the rise time, and preset a rate of voltage rise slopD, 1.2 ~ 1.5 times that generally get slopC;
3) judge whether secondary voltage currency is less than first critical voltage riseA, judged result is be less than then secondary voltage currency to rise with the speed of slopA, and returns after PID controlling unit;
4) if step 3) comparative result be that secondary voltage currency is more than or equal to first critical voltage riseA, then again by secondary voltage currency and first critical voltage riseA and second critical voltage riseB's and compare, if secondary voltage currency be less than first critical voltage riseA and second critical voltage riseB and, then secondary voltage currency rises with the speed of slopB, and returns after PID controlling unit; If secondary voltage currency be more than or equal to first critical voltage riseA and second critical voltage riseB and, then again secondary voltage currency is compared with flashover voltage, if secondary voltage currency is less than flashover voltage, then secondary voltage currency rises with the speed of slopC, and returns after PID controlling unit; If secondary voltage currency is greater than flashover voltage, then judge whether effective flashover occurs, if there is effective flashover, return after PID controlling unit, if there is not effective flashover, secondary voltage currency rises with the rate of voltage rise slopD preset, and program returns after PID controlling unit.
Compared with prior art, the invention has the beneficial effects as follows: High-frequency high-voltage electrostatic dust removal power control system can according to the change of load in real time and the effective power supply that controls export, make efficiency of dust collection reach best.By flashover determination methods, best flashover strike control method, system protection method, serious flashover and arcing processing method etc., reliable, perfect control is carried out to High-frequency high-voltage electrostatic dust removal power system; under the prerequisite ensureing power good reliably working, improve power-efficient, obtain good dust removing effects.
Accompanying drawing explanation
Fig. 1 is control system entire block diagram of the present invention;
Fig. 2 is software main program flow chart of the present invention;
Fig. 3 is defence program flow chart of the present invention;
Fig. 4 is secondary current voltage flashover decision flow chart of the present invention;
Fig. 5 is resonance current flashover decision flow chart of the present invention;
Fig. 6 is best flashover strike control flow chart of the present invention.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
As shown in Figure 1, a kind of High-frequency high-voltage electrostatic dust removal power control system is using DSP as system core controller.External input signal is divided into analog quantity and digital quantity input, analog input signal directly inputs DSP through part of data acquisition, digital quantity input signal carries out inputting DSP again after logical process through CPLD, and the control signal that DSP exports also carries out exporting after logical process through CPLD.Communication between power-supply system and host computer is realized by RS232/485 and CAN communication mode.
First described analog acquisition part converts field data to the signal of telecommunication by various kinds of sensors, again according to the feature determination sample frequency of analog signals, then design digital filter and determine the strategy that A/D converts, to improve sampling precision, the analog quantity of collection mainly comprises inlet wire current, busbar voltage, primary side current and resonance current, secondary side current voltage and one/secondary side current integration and temperature of oil in transformer, environment temperature.Described number connect test part expands the digital quantity I/O mouth of DSP by CPLD, digital quantity signal connects through CPLD and DSP, first digital quantity input signal is sent into CPLD and is carried out logical process to digital quantity signal, the result of process sends into DSP again, the control signal that DSP exports carries out exporting after logical process through CPLD, digital quantity input signal comprises 4 road IGBT malfunction feedback quantities, zero passage detection signal, primary side over-current signal and 18 line state feedback signals (comprise relay, contactor status signal etc.), digital output signal comprises the switching signal of 2 road integrations, No. 12 relay output signal and PWM output signal.
Described remote monitoring and communications portion mainly comprise RS232/485 and communicate and CAN communication three kinds of modes, and wherein, RS232 communication is used for system debug and program burn writing, and RS485 or CAN communication are used for telecommunication and monitoring.In order to realize long-haul reliable communication, RS485 in power-supply system or CAN communication port mapping to be become the COM port on host computer by RS485 or CAN communication by serial server, and convert rs 232 serial interface signal to ethernet signal, convert optical signal to by photoelectric conversion module again and realize the signal is far passed through optical fiber, convert optical signal to ethernet signal through photoelectric conversion module again at far-end and be connected to host computer.Multiple stage power-supply system is managed concentratedly by host computer by RS485 or CAN network consisting, and all power supply running statuses comprise operational factor and arrange, show and malfunction all centralized Control and displays on host computer.
The control method of described High-frequency high-voltage electrostatic dust removal power control system and the main flow of realization are as shown in Figure 2, first Initialize installation is carried out after start, wait Power supply is stablized, start PWM to export, then start soft start is entered, start main circuit, start A/D to gather, judge whether to break down according to each several part current and voltage data that A/D gathers, then carry out glitch process if there is glitch and report host computer, again judge subsequently, get rid of as glitch and then enter next step, as glitch is got rid of not yet, shut down, if there is major break down, here major break down does not comprise arcing fault, then direct stopping alarm report host computer, if there is not any fault, directly enter next step, judge whether to occur flashover according to secondary voltage and resonance current, as occurred, flashover then carries out flashover process and reports host computer, if there is not flashover, enter next step arcing and judge, as occurred, arcing then carries out arcing process, and then rejudge, then power-supply system is restarted as still having arcing, as do not occurred, arcing then enters next step and judges whether under-voltage, if under-voltage, carry out under-voltage process and report host computer, as not under-voltage, carry out next step flashover strike control, make power work under best flashover strike state, finally the real-time parameter of each link passed to host computer and enter next loop cycle.
As shown in Figure 3, this guard method flow process is described according to the structural order of power-supply system the guard method flow process of described power control system, and in program operation, each several part protection adopts interrupt mode, in no particular order.Defence program starts, judge whether inlet wire current transfinites, as transfinited, carry out the process of inlet wire overcurrent, and judge whether continuous overcurrent, as continuous overcurrent then stopping alarm, if not being that continuous overcurrent then thinks inlet wire not overcurrent, proceed to and judge that busbar voltage transfinites judgement, as transfinited, carry out overpressure treatment, then judge that whether busbar voltage is under-voltage as do not transfinited, as under-voltage, carry out under-voltage process, as not under-voltage, proceed to and judge whether IGBT has fault-signal, then fault-signal process is carried out if any fault-signal, and then judge whether to still have fault, if any then stopping alarm, judge as then do not proceeded to primary side overcurrent, as overcurrent then carries out an overcurrent process, and judge whether continuous overcurrent, as continuous overcurrent then stopping alarm, if be not continuous overcurrent then proceed to judge IGBT temperature and temperature of oil in transformer whether too high, as too high, carry out temperature over-range process, if not too high, proceed to and judge secondary side whether short circuit and open circuit, as be short-circuited or open fault then carry out short circuit process or open circuit process, then proceed to secondary overcurrent as not being short-circuited with open fault to judge, as overcurrent then carries out the process of secondary overcurrent, and judge whether continuous overcurrent, as continuous overcurrent then stopping alarm, judge as not continuous overcurrent then proceeds to secondary overvoltage, as overvoltage then carries out secondary overvoltage process, and then judge whether secondary voltage declines, as the then stopping alarm that do not decline, then proceed to primary current anomalous integral secondary current integration as declined to transfinite judgement, as integration transfinites, stopping alarm also keeps current sampled value, as integration does not transfinite, enter next loop cycle.
The flashover of described power control system judges that comprising secondary current voltage flashover judges, as shown in Figure 4, and resonance current flashover judges flow process, and flow process as shown in Figure 5.Secondary current voltage flashover judges that flow process is as follows: sampling secondary current voltage, secondary voltage sampled value is compared with the half of secondary voltage setting value respectively, if comparative result is be less than, the K of secondary current sampled value with secondary current preset value is doubly compared, if comparative result is for being greater than, think generation flashover, flashover number of times being added one, if comparative result is for being less than, returning the superiors; Then secondary voltage sampled value is carried out the secondary voltage accumulated value that adds up to obtain, and preset value 1 assignment that added up by secondary voltage to add up preset value 2 to secondary voltage, secondary voltage accumulated value assignment to add up preset value 1 to secondary voltage; And then the half of a half-sum preset value 2 of the preset value 1 that secondary voltage accumulated value and secondary voltage to be added up compares, as having one in comparative result for being less than, think generation flashover, flashover number of times is added one, as comparative result is all greater than, preset value 1 assignment that added up by secondary voltage to add up preset value 2 to secondary voltage, secondary voltage accumulated value assignment to add up preset value 1 to secondary voltage, and by the zero setting of secondary voltage accumulated value, program returns and enters next loop cycle.Resonance current flashover judges that flow process is as follows: sampling harmonic electric current, judge whether a resonant process terminates, if terminated, resonance current is added 2 with resonance current preset value and compares, if comparative result is for being greater than, be judged as that flashover occurs, carry out flashover process, if comparative result is for being less than, upgrading all preset values, adding up with resonance current value assignment to preset value by current forward and reverse resonance current peak value, oppositely resonance peak, and returning, if resonant process does not terminate, by resonance time from increasing 1, then judge it is forward resonance or reverse resonance, if be judged as forward resonance, 1.5 times of forward resonance peak and preset value are compared, preset value generally gets normal resonance current peak value, if comparative result is for being greater than, be judged as that flashover occurs, carry out flashover process, if comparative result is for being less than, then judge forward resonance current integration whether between bound, the upper limit generally gets 1.5 times of normal resonance current integration, lower limit generally gets 1.2 times of normal resonance current integration, if, be judged as that flashover occurs, carry out flashover process, if do not existed, return, if be judged as reverse resonance, 1.5 times of reverse resonance peak and preset value are compared, preset value generally gets normal resonance current peak value, if comparative result is for being greater than, be judged as that flashover occurs, carry out flashover process, if comparative result is for being less than then cumulative reversing the current absolute value, absolute value by reverse resonance current peak value is added with the absolute value of the reverse resonance current peak value of previous moment, with preset value 1.5 times of value after cumulative are compared, preset value is generally got normal oppositely resonance current peak value and is multiplied by reverse resonance current peak value accumulative frequency, if comparative result is for being greater than, be judged as that flashover occurs, carry out flashover process, if comparative result is for being less than, program returns.
The best flashover strike control method flow process of described power control system as shown in Figure 6, basic procedure is as follows: the time timeA calculating secondary voltage rising three phases according to flashover strike, timeB and timeC, the three phases that secondary voltage rises is three typical phases restored electricity after there is flashover, the critical voltage riseA of secondary voltage rising three phases is calculated according to flashover voltage, riseB and riseC, timeA, timeB and timeC and critical voltage riseA, the calculating of riseB and riseC is that the three slope flashover tracing figures drawn according to flashover strike calculate, again according to timeA, timeB, timeC and riseA, riseB, riseC calculates the rate of voltage rise slopA of secondary voltage rising three phases, slopB and slopC, namely electricity consumption presses rising amount and obtains divided by the rise time, and preset a rate of voltage rise slopD, 1.2 ~ 1.5 times that generally get slopC, then first secondary voltage currency is compared with first critical voltage riseA, if comparative result is be less than, secondary voltage currency rises with the speed of slopA, and return after PID controlling unit, if comparative result is be more than or equal to, then by secondary voltage currency and first critical voltage riseA and second critical voltage riseB's and compare, if comparative result is be less than, secondary voltage currency rises with the speed of slopB, and return after PID controlling unit, if comparative result is for being more than or equal to, then secondary voltage currency is compared with flashover voltage, if comparative result is be less than, secondary voltage currency rises with the speed of slopC, and return after PID controlling unit, if comparative result is for being greater than, judge whether effective flashover occurs, if there is effective flashover, return after PID controlling unit, if there is not effective flashover, secondary voltage currency rises with the rate of voltage rise slopD preset, and program returns after PID controlling unit.
The major break down of described power control system judge to comprise whether arcing and there is serious flashover, whether whether all temperature transfinite, once transfinite with secondary current integration, primary current and whether secondary current voltage transfinites, whether inlet wire current transfinites and whether busbar voltage transfinites or under-voltage etc.; then shut down carry out troubleshooting as there is major break down, and then restart power supply.
The glitch of described power control system judges to comprise that flashover per minute occurs whether number of times transfinites, whether inlet wire current is less than calculated value, whether all temperature are greater than a certain setting value and be less than higher limit, primary current and secondary current voltage and whether be greater than a certain setting value and be less than higher limit and once whether be less than lower limit with secondary current integration; then process online as there is glitch; and then judge; as failture evacuation then power supply continuation operation, as fault does not get rid of then stopping alarm.
In addition to the implementation, the present invention can also have other embodiments, and all employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop in the protection domain of application claims.

Claims (4)

1. a High-frequency high-voltage electrostatic dust removal power control system, is characterized in that, comprises DSP (1), collecting part (2), CPLD (3), communications portion (4), external input signal is divided into analog input signal and digital quantity input signal, and described analog input signal comprises inlet wire current signal, bus voltage signal, primary side current and resonance current signal, secondary current voltage signal, a secondary side current integrated signal, temperature of oil in transformer signal, ambient temperature signal, described digital quantity input signal comprises 4 road IGBT malfunction feedback quantity input signals, zero passage detection signal, primary side over-current signal, 18 line state feedback signals, described analog input signal is through part of data acquisition (2) input DSP (1), described digital quantity input signal inputs DSP (1) after CPLD (3) carries out logical process, the control signal that DSP (1) exports exports after CPLD (3) carries out logical process, and the switching signal that the digital output part that CPLD (3) exports comprises a secondary side current integration exports, 12 road relay control signals export and pwm signal exports, and the communication between High-frequency high-voltage electrostatic dust removal power control system and host computer is realized by RS232/485 and CAN communication mode.
2. a secondary current voltage flashover determination methods for High-frequency high-voltage electrostatic dust removal power control system as claimed in claim 1, is characterized in that, comprise the following steps:
1) sampling secondary current voltage, judge whether secondary voltage sampled value is less than the half of secondary voltage setting value, secondary voltage setting value gets 60KV ~ 80KV according to the situation of actual electric field;
2) if step 1) comparative result be yes, then judge whether secondary current sampled value is greater than the K of secondary current setting value doubly, wherein, secondary current preset value gets 1.1 ~ 1.3 times of secondary current sample mean when actual electric field normally works, and the value of K gets 1.5 ~ 3 according to the characteristic of actual electric field;
3) if step 2) comparative result for being greater than, then think and generation flashover flashover number of times added one; If comparative result is for being less than, return step 1);
4) if step 1) judged result be no, secondary voltage sampled value and a front secondary voltage value are carried out the secondary voltage accumulated value that adds up to obtain, and preset value 1 assignment that added up by secondary voltage to add up preset value 2 to secondary voltage, secondary voltage accumulated value assignment to add up preset value 1 to secondary voltage;
5) judge whether secondary voltage accumulated value is less than secondary voltage and adds up the half of preset value 1, judge whether secondary voltage accumulated value is less than secondary voltage and adds up the half of preset value 2;
6) if step 5) comparative result in have one to be yes, then think and generation flashover flashover number of times added one;
7) if step 5) comparative result be no, preset value 1 assignment that then added up by secondary voltage to add up preset value 2 to secondary voltage, secondary voltage accumulated value assignment to add up preset value 1 to secondary voltage, and by the zero setting of secondary voltage accumulated value, program returns and enters next loop cycle.
3. a resonance current flashover determination methods for High-frequency high-voltage electrostatic dust removal power control system as claimed in claim 1, is characterized in that, comprise the following steps:
1) sampling harmonic electric current, judge whether a resonant process terminates, if terminated, resonance current is added 2 with resonance current preset value and compares, wherein, resonance current preset value gets 1.1 ~ 1.3 times of resonance current sample mean when actual electric field normally works, if comparative result is for being greater than, being judged as that flashover occurs, carrying out flashover process;
2) if step 1) a resonant process terminate, resonance current and resonance current preset value add 2 results compared for being less than, then upgrade all preset values, add up to resonance current value assignment to corresponding preset value by current forward and reverse resonance current peak value, oppositely resonance peak, and return;
3) if step 1) judge that resonant process does not terminate, then resonance time is increased 1 certainly, then judge it is forward resonance or reverse resonance;
4) if be judged as forward resonance, then judge whether forward resonance peak is greater than 1.5 times of preset value, preset value gets normal resonance current peak value, if comparative result is for being greater than, being judged as that flashover occurs, carrying out flashover process;
5) if step 4) comparative result for being less than, then judge forward resonance current integration more whether between bound, the upper limit generally gets 1.5 times of normal resonance current integration, lower limit gets 1.2 times of normal resonance current integration, if between bound, be judged as that flashover occurs, carry out flashover process; If not between bound, return;
6) if step 3) be judged as reverse resonance, then compare 1.5 times of reverse resonance peak and preset value, preset value gets normal resonance current peak value, if comparative result is for being greater than, being judged as that flashover occurs, carrying out flashover process; If comparative result is for being less than then cumulative reversing the current absolute value, absolute value by reverse resonance current peak value is added with the absolute value of the reverse resonance current peak value of previous moment, with preset value 1.5 times of value after cumulative are compared, preset value is got normal oppositely resonance current peak value and is multiplied by reverse resonance current peak value accumulative frequency, if comparative result is for being greater than, be judged as that flashover occurs, carry out flashover process, if comparative result is for being less than, program returns.
4. a best flashover strike control method for High-frequency high-voltage electrostatic dust removal power control system as claimed in claim 1, is characterized in that, comprise the following steps:
1) time timeA, timeB and timeC of secondary voltage rising three phases is calculated according to flashover strike, the three phases that secondary voltage rises is three typical phases restored electricity after there is flashover, calculates critical voltage riseA, riseB and riseC of secondary voltage rising three phases according to flashover voltage; The calculating of timeA, timeB and timeC and critical voltage riseA, riseB and riseC is that the three slope flashover tracing figures drawn according to flashover strike calculate;
2) according to rate of voltage rise slopA, slopB and slopC of timeA, timeB, timeC and riseA, riseB, riseC calculating secondary voltage rising three phases, namely electricity consumption presses rising amount and obtains divided by the rise time, and preset a rate of voltage rise slopD, 1.2 ~ 1.5 times that get slopC;
3) judge whether secondary voltage currency is less than first critical voltage riseA, judged result is be less than then secondary voltage currency to rise with the speed of slopA, and returns after PID controlling unit;
4) if step 3) comparative result be that secondary voltage currency is more than or equal to first critical voltage riseA, then again by secondary voltage currency and first critical voltage riseA and second critical voltage riseB's and compare, if secondary voltage currency be less than first critical voltage riseA and second critical voltage riseB and, then secondary voltage currency rises with the speed of slopB, and returns after PID controlling unit; If secondary voltage currency be more than or equal to first critical voltage riseA and second critical voltage riseB and, then again secondary voltage currency is compared with flashover voltage, if secondary voltage currency is less than flashover voltage, then secondary voltage currency rises with the speed of slopC, and returns after PID controlling unit; If secondary voltage currency is greater than flashover voltage, then judge whether effective flashover occurs, if there is effective flashover, return after PID controlling unit, if there is not effective flashover, secondary voltage currency rises with the rate of voltage rise slopD preset, and program returns after PID controlling unit.
CN201310573698.1A 2013-11-18 2013-11-18 High-frequency high-voltage electrostatic dust removal power control system and method CN103611631B (en)

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