Working condition adaptive method and system of frequency conversion pulse power supply of electric dust collector

Abstract

The present application belongs to the technical field of high-voltage electrostatic dust removal, and particularly relates to a working condition adaptive method and system of a variable-frequency pulse power supply of an electric dust collector, which comprises the following steps: dividing an incremental pulse section from the tail of a current pulse control waveform, constructing a continuous position identification sequence and a recovery position identification sequence with a reference pulse section and the same incremental pulse section, and collecting the secondary voltage and secondary current responses at two time positions; when the relative difference of the electrical responses of the reference section is not greater than the comparability limit of the reference section and the relative difference of the secondary voltage of the incremental section is not greater than the secondary voltage comparability limit of the incremental section, forming the continuous position charge response and the recovery position charge response, respectively; when the time position response difference is greater than the charge response dead zone, determining the recovery position direction, when the time position response difference is less than the negative value of the charge response dead zone, determining the continuous position direction, and otherwise keeping the current pulse time relationship; forming a pulse time allowable domain and updating the pulse width and pulse repetition period according to the above steps. The present application improves the adaptability of the variable-frequency pulse power supply to working condition changes.

Description

Technical Field

[0001] This invention relates to the field of high-voltage electrostatic precipitator technology. More specifically, this invention relates to a method and system for adaptive operation of a variable frequency pulse power supply for an electrostatic precipitator. Background Technology

[0002] During the operation of an electrostatic precipitator, a variable frequency pulse power supply provides pulse power to the high-voltage electric field and changes the energized state of the electric field by adjusting the secondary voltage, secondary current, and pulse power supply timing. Under actual operating conditions, the flue gas volume, dust concentration, dust characteristics, and unit load will change with the production process, and the response of the electric field to the pulse power supply will also change. Therefore, the pulse width and pulse repetition period need to be adjusted according to the operating conditions.

[0003] Existing variable frequency pulse power supply control typically adjusts the power supply status based on spark state, secondary voltage, secondary current, flue gas conditions, or preset operating parameters. For pulse width and pulse repetition period, the common approach is to change the parameters separately according to the current operating indicators, or to select parameter combinations according to preset formulas, search or optimization processes, in order to maintain stable operation of the electric field.

[0004] However, the time response of the electrostatic precipitator's electric field to pulsed power supply is not fixed under different operating conditions. The actual secondary electrical response of the same set of pulse time parameters may change after variations in load, flue gas conditions, or dust characteristics. Although existing control methods can correct pulse parameters based on operating indicators, the pulse width and pulse repetition period are often determined separately based on predetermined indicators, preset rules, or optimization targets. This makes it difficult to reflect changes in the actual time response of the electric field, resulting in the difficulty in coordinating the adjustment of pulse width and pulse repetition period around the actual time response of the current electric field. Summary of the Invention

[0005] To address the technical problem that the pulse width and pulse repetition period are difficult to adjust in a coordinated manner based on the actual time response of the current electric field, the present invention provides solutions in the following aspects.

[0006] In a first aspect, the present invention provides an adaptive operating condition method for a variable frequency pulse power supply for an electrostatic precipitator, comprising: Divide the current pulse control waveform into incremental pulse segments, and take the part before the incremental pulse segment as the reference pulse segment; immediately apply the incremental pulse segment after the reference pulse segment to form a continuous position identification sequence; stop the pulse control component after the reference pulse segment and apply the incremental pulse segment at the beginning of the next pulse to form a restored position identification sequence; Execute the continuous position identification sequence and the restored position identification sequence respectively. Calculate the relative difference of the secondary voltage of the reference segment based on the secondary voltage waveforms of the reference pulse segments in the continuous and restored position identification sequences. Calculate the relative difference of the secondary current of the reference segment based on the secondary current waveforms of the reference pulse segments in the continuous and restored position identification sequences. Take the maximum value of the relative difference of the secondary voltage and the relative difference of the secondary current of the reference segment as the relative difference of the electrical response of the reference segment. When the relative difference of the electrical response of the reference segment is not greater than a predetermined comparability limit for the reference segment, calculate the relative difference of the secondary voltage of the incremental segment based on the secondary voltage waveforms of the incremental pulse segments in the continuous and restored position identification sequences. When the relative difference of the secondary voltage of the incremental segment is not greater than a predetermined comparability limit for the secondary voltage of the incremental segment, it is determined that both the comparison of the electrical response of the reference pulse segment and the actual secondary voltage of the incremental pulse segment meet the comparability condition. When both comparisons meet the comparability condition, the secondary current of the incremental pulse segment of the continuous position identification sequence and the recovered position identification sequence are integrated to form the continuous position charge response and the recovered position charge response, respectively. The time position response difference is formed by subtracting the continuous position charge response from the recovered position charge response. When the time position response difference is greater than the charge response dead zone, the time migration direction is determined as the recovered position direction. When the time position response difference is less than the negative value of the charge response dead zone, the time migration direction is determined as the continuous position direction. When the absolute value of the time position response difference is not greater than the charge response dead zone, the current pulse time relationship is maintained. When the time migration direction is either the recovery position direction or the continuous position direction, the pulse time allowable domain is formed according to the time migration direction: the difference between the candidate pulse repetition period and the candidate pulse width is not less than the minimum allowable pulse off time; in the recovery position direction, the candidate pulse width is not greater than the current pulse width and the candidate pulse repetition period is not less than the current pulse repetition period; in the continuous position direction, the candidate pulse width is not less than the current pulse width and the candidate pulse repetition period is not greater than the current pulse repetition period. Update the current valid pulse power supply timing within the pulse time allowable domain; While maintaining the current pulse timing relationship, continue executing the current valid pulse power supply timing sequence.

[0007] Preferably, the step of dividing the incremental pulse segment from the tail of the current pulse control waveform and using the portion before the incremental pulse segment as the reference pulse segment includes: The minimum adjustment unit of pulse width that the controller of the variable frequency pulse power supply can actually execute is taken as the duration of the incremental pulse segment. An incremental pulse segment with a duration equal to the duration of the incremental pulse segment is divided from the tail of the current pulse control waveform. The part of the current pulse control waveform before the incremental pulse segment is taken as the reference pulse segment. The reference pulse segment adopts the original control waveform in the current effective pulse power supply sequence, and the incremental pulse segment adopts the control waveform divided from the tail of the current pulse control waveform, so that the pulse formed when the reference pulse segment and the incremental pulse segment are applied continuously is consistent with the normal pulse in the current effective pulse power supply sequence.

[0008] Preferably, the method for recovering the location identification sequence is as follows: When executing the recovery position identification sequence, the next normal pulse that should have started at the boundary of the current pulse repetition cycle is replaced by an incremental pulse segment. After the incremental pulse segment ends, the pulse control component remains off until the start time of the next complete normal pulse, at which point the current effective pulse power supply timing is restored.

[0009] Preferably, the step of executing the continuous position identification sequence and the recovered position identification sequence respectively further includes: Using the same secondary voltage acquisition channel, secondary current acquisition channel, sampling period, and triggering rules, the secondary voltage and secondary current of the reference pulse segment and incremental pulse segment in the continuous position identification sequence and the recovered position identification sequence are acquired respectively. The secondary voltage sampling time and secondary current sampling time are corrected according to the fixed acquisition delays that are predetermined and stored for the secondary voltage acquisition channel and the secondary current acquisition channel during the equipment calibration stage. The local time of the reference pulse segment is established with the start time of the reference pulse segment of each of the continuous position identification sequence and the recovered position identification sequence, and the local time of the incremental pulse segment is established with the start time of the incremental pulse segment of each of the two sequences, forming the secondary voltage waveform, the secondary current waveform, the secondary voltage waveform, and the secondary current waveform of the incremental pulse segment.

[0010] Preferably, the method for obtaining the comparability limit of the benchmark segment is as follows: Under the same calibration configuration, the same control waveform is executed twice for both the continuous position identification sequence and the restored position identification sequence. For the reference pulse segment, the relative difference of the reference segment electrical response between the two repeated reference pulse responses of the continuous position and the relative difference of the reference segment electrical response between the two repeated reference pulse responses of the restored position are formed, and the maximum value of the two is used as the reference segment comparability limit. The method for obtaining the comparability limit of the incremental segment secondary voltage is as follows: For the incremental pulse segment, the relative difference of the incremental segment secondary voltage between the two repeated incremental segment secondary voltage waveforms at consecutive positions and the relative difference of the incremental segment secondary voltage between the two repeated incremental segment secondary voltage waveforms at the recovery position are respectively formed, and the larger of the two is used as the comparability limit of the incremental segment secondary voltage.

[0011] Preferably, the method for obtaining the charge response dead zone is as follows: Under the same calibration configuration, the continuous position identification sequence executes the same incremental pulse control process twice, and the recovery position identification sequence executes the same incremental pulse control process twice, respectively forming the charge response of the continuous position twice repeated identification and the charge response of the recovery position twice repeated identification. The absolute value of the difference between the two charge responses of the continuous position and the absolute value of the difference between the two charge responses of the recovery position are calculated, and the maximum value of the two absolute values ​​of difference is taken as the charge response dead zone.

[0012] Preferably, updating the current valid pulse power supply timing within the pulse time allowable domain includes: When the time migration direction is the recovery position direction, within the pulse time allowable domain, the current pulse width, which can be adjusted in the decreasing direction, is reduced by one pulse width minimum adjustment unit, and the current pulse repetition period, which can be adjusted in the increasing direction, is increased by one pulse repetition period minimum adjustment unit; if only one of the current pulse width and the current pulse repetition period can continue to be adjusted, only the time parameter that can continue to be adjusted is adjusted. When the time migration direction is a continuous position direction, if the current pulse width can be adjusted by one minimum pulse width adjustment unit in the increasing direction within the pulse time allowable domain, and the current pulse repetition period can be adjusted by one minimum pulse repetition period adjustment unit in the decreasing direction within the pulse time allowable domain, then the current pulse width is increased by one minimum pulse width adjustment unit, and the current pulse repetition period is decreased by one minimum pulse repetition period adjustment unit. Candidate power supply operation parameters are generated based on the adjusted current pulse width and current pulse repetition period. When the candidate power supply operation parameters meet the pulse time allowable range and the current protection interlock is not in operation, the candidate power supply operation parameters are written into the frequency converter pulse power controller and used as the new current valid power supply operation parameters.

[0013] Secondly, the present invention provides an adaptive operating condition system for a variable frequency pulse power supply for an electrostatic precipitator, comprising a processor and a memory, wherein the memory stores computer program instructions, and when the computer program instructions are executed by the processor, the aforementioned adaptive operating condition method for a variable frequency pulse power supply for an electrostatic precipitator is implemented.

[0014] By adopting the above technical solution, a computer program is generated for the above-mentioned adaptive method of variable frequency pulse power supply for electrostatic precipitators, and stored in the memory so that it can be loaded and executed by the processor. In this way, a terminal device can be made based on the memory and the processor for convenient use.

[0015] The beneficial effects of this invention are as follows: By comparing the actual secondary electrical responses formed by the same incremental pulse segment in continuous and recovery positions, this invention determines the time migration direction corresponding to the current electrostatic precipitator electric field while ensuring that the two identification results have a comparable basis. This allows the adjustment of pulse time parameters to be directly derived from the actual time response of the current electric field. Furthermore, based on this time migration direction, the change direction of pulse width and pulse repetition period is jointly limited, and the update of the current effective pulse power supply sequence is completed within the pulse time allowable domain. This avoids the problem of inconsistency between the pulse width and pulse repetition period and the current electric field time response when they are adjusted separately. This enables the variable frequency pulse power supply to continuously adjust the pulse power supply rhythm according to the changes in the operating state of the electrostatic precipitator electric field, improving the adaptability of pulse time parameters to changes in actual operating conditions. Attached Figure Description

[0016] Figure 1 This is a flowchart of an adaptive operating condition method for a variable frequency pulse power supply for an electrostatic precipitator according to the present invention; Figure 2 A schematic diagram of the pulse timing for continuous position identification sequences and recovered position identification sequences. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0019] This invention discloses an adaptive operating condition method for a variable frequency pulse power supply for an electrostatic precipitator, referring to... Figure 1 This includes steps S1-S5: S1. Divide the current pulse control waveform into incremental pulse segments, and take the part before the incremental pulse segment as the reference pulse segment; immediately apply the incremental pulse segment after the reference pulse segment to form a continuous position identification sequence; stop the pulse control component after the reference pulse segment and apply the incremental pulse segment at the start of the next pulse to form a restored position identification sequence.

[0020] When the adaptive control cycle arrives, the current pulse width and current pulse repetition period of the variable frequency pulse power supply are read, and the time difference between the current pulse repetition period and the current pulse width is defined as the current pulse off time. The controller of the variable frequency pulse power supply has a minimum pulse width adjustment unit that can be actually executed. One minimum pulse width adjustment unit is used as the duration of the incremental pulse segment in the current identification cycle, so that the duration of the incremental pulse segment is determined by the time resolution capability that the variable frequency pulse power supply itself can stably execute. In this embodiment, the minimum pulse width that the device is allowed to execute is greater than one minimum pulse width adjustment unit, so that when the current pulse width is within the allowable range of the device, a reference pulse segment with a non-zero duration can be retained. An incremental pulse segment with a duration equal to the duration of the incremental pulse segment is divided from the tail of the current pulse control waveform. The part of the current pulse control waveform before the incremental pulse segment constitutes the reference pulse segment, and the duration of the current pulse width excluding the duration of the incremental pulse segment is defined as the duration of the reference pulse segment. The reference pulse segment uses the original control waveform in the current effective pulse power supply sequence, and the incremental pulse segment uses the control waveform drawn from the tail of the current pulse control waveform. Therefore, the pulse formed when the reference pulse segment and the incremental pulse segment are applied continuously is consistent with the normal pulse in the current effective pulse power supply sequence.

[0021] After the reference pulse segment and the incremental pulse segment are formed, a continuous position identification sequence and a restored position identification sequence are constructed based on their different connection relationships on the time axis. Specifically: the identification sequence in which the incremental pulse segment is applied immediately after the end of the reference pulse segment is defined as the continuous position identification sequence; the identification sequence in which the pulse control component is stopped after the end of the reference pulse segment, and the same incremental pulse segment is applied at the start of the next pulse of the current pulse repetition period is defined as the restored position identification sequence. Figure 2 As shown, the incremental pulse segment in the continuous position identification sequence is applied immediately after the reference pulse segment, while the incremental pulse segment in the recovered position identification sequence is applied starting from the beginning of the next pulse. The time interval between the end of the reference pulse segment and the beginning of the next pulse in the recovered position identification sequence is defined as the recovery interval. Since the reference pulse segment is formed by drawing an incremental pulse segment from the tail of the current normal pulse, the recovery interval includes both the current pulse's off-time and the original duration of the incremental pulse segment within the current normal pulse.

[0022] When the recovery position identification sequence is executed, the next normal pulse that should have started at the boundary of the current pulse repetition cycle is replaced by a migrated incremental pulse segment. After the incremental pulse segment ends, the pulse control component remains off until the start of the next complete normal pulse. From that start, the current effective pulse power supply sequence is restored, thus ensuring that the incremental pulse segment in the recovery position identification does not overlap with the next normal pulse. When the frequency converter pulse power supply adopts a power supply structure that superimposes the basic power supply component and the pulse power supply component, the currently executing basic power supply configuration is read as the current effective basic power supply state. The same current effective basic power supply state is maintained during the execution of the continuous position identification sequence and the recovery position sequence. Only the pulse power supply component is stopped during the recovery interval. When the basic power supply component is not used, the pulse power supply component remains off during the recovery interval.

[0023] To represent the relationship between the incremental pulse segment control waveforms in the two identification sequences, let... Incremental pulse segment control waveform for continuous position identification sequence, To recover the incremental pulse segment control waveform of the position identification sequence, For the incremental pulse segment control waveform drawn from the tail of the current pulse control waveform, then: ; In the formula, For the first In each identification cycle, the continuous position identification sequence is localized within the incremental pulse segment. Incremental pulse control waveform at the location; For the first The recovered position identification sequence is localized within the incremental pulse segment during each identification cycle. Incremental pulse control waveform at the location; For the first The incremental pulse segment control waveform drawn from the tail of the current pulse control waveform in each identification cycle; This refers to the local time within the incremental pulse segment; For the first The duration of the incremental pulse segment in each identification cycle; 0 indicates the starting boundary of the local time of the incremental pulse segment; To identify the cycle number.

[0024] In constructing the two identification sequences, the incremental pulse control waveforms in the continuous position identification sequence and the recovered position identification sequence are matched according to the same local time of the incremental pulse segment, and the two time positions use the exact same incremental pulse control waveform. Therefore, the technical condition for the two identifications to be actively changed is that the time position of the incremental pulse segment relative to the reference pulse segment and the pulse boundary, and the control waveform of the incremental pulse segment itself remain consistent, so that the actual electrical responses obtained at the two time positions have a clear basis for comparison.

[0025] The pulse control component of a continuous position identification sequence can be represented as: ; In the formula, For the first The continuous position identification sequence in each identification cycle is in time The pulse control component at the location; For the first The reference pulse segment control waveform in each identification cycle; The control waveform for the incremental pulse segment is the incremental pulse segment whose local time zero point is taken as the starting time of the continuous position incremental pulse segment; The time is the time from which the start time of the reference pulse segment of the continuous position identification sequence is taken as the zero point; For the first The duration of the reference pulse segment in each identification cycle; For the first The duration of the incremental pulse segment in each identification cycle; 0 indicates the time start point of the continuous position identification sequence. The identification cycle number is used. The continuous position identification sequence consists of a reference pulse segment and an immediately following incremental pulse segment, arranged chronologically. After the reference pulse segment finishes execution, no pulse shutdown interval is inserted; instead, the incremental pulse segment is executed directly, thus the two control waveforms are continuously connected on the time axis. Since the incremental pulse segment originates from the tail of the current normal pulse, the continuous combination of the reference pulse segment and the incremental pulse segment corresponds to the original continuous energization relationship of the current normal pulse, thereby forming the continuous position identification condition for obtaining the electric field response when the incremental pulse segment continues to act on the tail of the current pulse.

[0026] The pulse control component of the recovered position identification sequence can be expressed as: ; In the formula, For the first The recovered position identification sequence is in time during each identification cycle. The pulse control component at the location; For the first The reference pulse segment control waveform in each identification cycle; The control waveform for the incremental pulse segment is the incremental pulse segment after the start time of the recovered position incremental pulse segment is taken as the local time zero point; The time is the time when the start time of the reference pulse segment of the recovered position identification sequence is taken as the zero point; For the first The duration of the reference pulse segment in each identification cycle; For the first The current pulse repetition cycle in each identification cycle; For the first The duration of the incremental pulse segment in each identification cycle; This indicates that the pulse control component is in the off state during this time interval; In Indicates the starting point of the recovered location identification sequence; This is the identification cycle number. The recovery position identification sequence first executes a reference pulse segment identical to the continuous position identification sequence. After the reference pulse segment ends, the pulse control component remains off until the start of the next pulse in the current pulse repetition cycle, at which point an incremental pulse segment identical to the continuous position identification sequence is executed. A recovery interval is thus formed between the reference pulse segment and the incremental pulse segment, allowing the incremental pulse segment to migrate from the end of the current normal pulse to the recovered time position. Therefore, the continuous position identification sequence and the recovery position sequence have the same reference pulse segment and the same incremental pulse segment, with the incremental pulse segment located at the continuous position after the reference pulse segment and the recovered position after the recovery interval, respectively.

[0027] When the current pulse width is insufficient to divide the reference pulse segment and the incremental pulse segment, or when executing any identification sequence would violate the protection conditions of the frequency converter pulse power supply, the current identification cycle maintains the current effective pulse power supply timing and does not perform time position identification.

[0028] S2. Execute the continuous position identification sequence and the restored position identification sequence respectively.

[0029] After the continuous position identification sequence and the recovery position identification sequence are formed, the protection status of the frequency converter pulse power supply and the acquisition status of the secondary voltage acquisition channel and the secondary current acquisition channel are checked. When the frequency converter pulse power supply is not in the protection action state, and both the secondary voltage acquisition channel and the secondary current acquisition channel are in the effective acquisition state, the current time position identification is performed; when the frequency converter pulse power supply is in the protection action state or any acquisition channel is not in the effective acquisition state, the current effective pulse power supply sequence is maintained, and the time position identification of the current operating condition adaptive control cycle ends. In this implementation method, the direction of current transmission from the frequency converter pulse power supply to the electrostatic precipitator electric field is uniformly defined as the positive direction of the secondary current, and the secondary current acquired by the continuous position identification sequence and the recovery position identification sequence adopts this direction convention.

[0030] During time-position identification, the variable frequency pulse power supply is first controlled according to the continuous position identification sequence. After the reference pulse segment ends, an incremental pulse segment is applied directly. The secondary voltage and current of both the reference and incremental pulse segments are simultaneously acquired through the secondary voltage and secondary current acquisition channels. After the continuous position identification sequence is completed, the pulse power supply component remains off during the remaining pulse off time of the current pulse repetition cycle. At the start of the next normal pulse, the recovery position identification sequence is executed. This recovery sequence first applies the same reference pulse segment as the continuous position identification sequence. After the reference pulse segment ends, the pulse power supply component remains off. At the start of the next pulse of the pulse repetition cycle to which the reference pulse segment belongs, the same incremental pulse segment as the continuous position identification sequence is applied. During the execution of the recovery position identification sequence, the same secondary voltage and current acquisition channels, sampling period, and triggering rules as the continuous position identification sequence are used to simultaneously acquire the secondary voltage and secondary current of both the reference and incremental pulse segments. After the incremental pulse segment in the restored position identification sequence ends, the pulse power supply component remains off until the start of the next complete normal pulse, from which the current effective pulse power supply timing is restored.

[0031] After acquiring the electrical signals for the two identification sequences, the sampling time of the corresponding sampled data is corrected according to the fixed acquisition delay predetermined and stored during the equipment calibration phase for the secondary voltage and secondary current acquisition channels. This fixed acquisition delay is a fixed time delay introduced by the acquisition link of the corresponding acquisition channel. The same fixed acquisition delay is used for both the continuous position identification sequence and the recovered position identification sequence for the same acquisition channel. After completing the fixed acquisition delay correction, a local time for the reference pulse segment is established based on the start time of the reference pulse segment for each of the two identification sequences, and a local time for the incremental pulse segment is established based on the start time of the incremental pulse segment for each. Waveform data within the corresponding time interval is extracted from the corrected secondary voltage and secondary current sampled data according to the corresponding durations of the reference pulse segment and the incremental pulse segment. The fixed acquisition delay correction is used to eliminate the sampling time offset caused by the fixed time delay of the acquisition link, and the local time of the reference pulse segment and the local time of the incremental pulse segment are used to ensure that waveform intervals performing the same technical function in the two identification sequences have a consistent time reference.

[0032] After completing the electrical signal acquisition, fixed acquisition delay correction, and local time establishment for two identification sequences, the following waveforms are generated: the secondary voltage and secondary current waveforms of the reference pulse segment for the continuous position identification sequence; the secondary voltage and secondary current waveforms of the reference pulse segment for the recovered position identification sequence; and the secondary voltage and secondary current waveforms of the incremental pulse segment for the continuous position identification sequence, as well as the secondary voltage and secondary current waveforms of the incremental pulse segment for the recovered position identification sequence. Each waveform maintains the correspondence between its respective identification sequence and pulse segment, serving as the electrical response data generated by the current time and position identification.

[0033] S3. Compare the reference pulse segment electrical response and the actual secondary voltage of the incremental pulse segment between the continuous position identification sequence and the recovered position identification sequence.

[0034] After the reference pulse segment secondary voltage waveform, reference pulse segment secondary current waveform, incremental pulse segment secondary voltage waveform, and incremental pulse segment secondary current waveform are formed for the continuous position identification sequence and the recovered position identification sequence, the reference pulse segment common to the two identification sequences is first used to determine whether the electrical response basis at the two identifications is consistent. After the reference pulse segment meets the comparability condition, the actual secondary voltage of the two incremental pulse segments is then used to determine whether the same incremental pulse control waveform forms a comparable actual voltage excitation at the two time positions.

[0035] Specifically, the relative difference in the secondary voltage of the reference segment is calculated based on the secondary voltage waveform of the reference pulse segment of the two identification sequences: ; In the formula, For the first The relative difference of the secondary voltage of the reference segment in each identification cycle; For the first The continuous position identification sequence in each identification cycle is localized within the reference pulse segment. Secondary voltage at the location; For the first The recovered position identification sequence is located within the local time of the reference pulse segment in each identification cycle. Secondary voltage at the location; This refers to the local time within the reference pulse segment; For the first The lower limit of the norm of the secondary voltage waveform of the reference segment in each identification period is used to avoid abnormal amplification of minute changes that the acquisition channel can distinguish during the normalization process when the overall amplitude of the secondary voltage waveform of the reference pulse segment is small. This indicates time integration over the duration of the reference pulse segment; This represents the differential component of the local time of the reference pulse segment; 0 represents the starting boundary of the local time of the reference pulse segment. The numerator represents the identification cycle number. In the formula, the numerator reflects the overall difference amplitude of the secondary voltage waveforms of the reference pulse segments of the two identification sequences throughout the entire reference pulse segment; the denominator is normalized using the overall amplitude of the secondary voltage waveforms of the reference pulse segments of the continuous position identification sequence and the recovered position identification sequence.

[0036] The relative difference in secondary current of the reference segment is calculated based on the secondary current waveform of the reference pulse segment in the two identification sequences: ; In the formula, For the first The relative difference of the secondary current in the reference segment of each identification cycle; For the first The continuous position identification sequence in each identification cycle is localized within the reference pulse segment. Secondary current at the location; For the first The recovered position identification sequence is located within the local time of the reference pulse segment in each identification cycle. Secondary current at the location; This refers to the local time within the reference pulse segment; For the first The duration of the reference pulse segment in each identification cycle; For the first The lower limit of the norm of the secondary current waveform of the reference segment in each identification period is used to avoid abnormal amplification of minute changes that the acquisition channel can distinguish during the normalization process when the overall amplitude of the secondary current waveform of the reference pulse segment is small. This indicates time integration over the duration of the reference pulse segment; This represents the differential component of the local time of the reference pulse segment; 0 represents the starting boundary of the local time of the reference pulse segment. The numerator represents the identification cycle number. In the formula, the numerator reflects the overall difference amplitude of the secondary current waveforms of the reference pulse segments of the two identification sequences throughout the entire reference pulse segment; the denominator is normalized using the overall amplitude of the secondary current waveforms of the reference pulse segments of the continuous position identification sequence and the recovered position identification sequence.

[0037] The relative difference in electrical response of the reference segment is obtained based on the relative difference in secondary voltage and the relative difference in secondary current of the reference segment: ; In the formula, For the first The relative differences in electrical response of the reference segment in each identification cycle; For the first The relative difference of the secondary voltage of the reference segment in each identification cycle; For the first The relative difference of the secondary current in the reference segment of each identification cycle; This indicates that the larger of the relative difference in secondary voltage and the relative difference in secondary current during the reference pulse segment is taken. Since the common reference pulse segment can only be considered to reflect a comparable electrical response basis if both the secondary voltage and secondary current are sufficiently close at the two identification times, the larger of the relative difference in secondary voltage and the relative difference in secondary current is taken as the relative difference in electrical response of the reference segment.

[0038] The relative difference in the incremental pulse segment secondary voltage is calculated based on the incremental pulse segment secondary voltage waveforms of the continuous position identification sequence and the recovered position identification sequence: ; In the formula, For the first The relative difference in secondary voltage of the incremental segment in each identification cycle; For the first In each identification cycle, the continuous position identification sequence is localized within the incremental pulse segment. The actual secondary voltage at the location; For the first The recovered position identification sequence is localized within the incremental pulse segment during each identification cycle. The actual secondary voltage at the location; This refers to the local time within the incremental pulse segment; For the first The duration of the incremental pulse segment in each identification cycle; For the first The lower limit of the norm of the incremental segment of the secondary voltage waveform in each identification period is used to limit the normalized amplification under low-amplitude actual secondary voltage conditions. This indicates time integration over the duration of the incremental pulse segment; This represents the differential component of the local time of the incremental pulse segment; 0 represents the starting boundary of the local time of the incremental pulse segment. To identify the cycle number.

[0039] The lower limit of the waveform norm used in the calculation of the relative difference between the reference pulse segment and the incremental pulse segment is formed by the minimum effective change amplitude that the corresponding acquisition channel can resolve under the current sampling range: the minimum effective change amplitude is determined based on the A / D quantization resolution and channel calibration results of the acquisition channel under the current sampling range, and is pre-stored in the controller. For the lower limit of the norm of the secondary voltage waveform in the reference segment, the minimum effective voltage change amplitude of the secondary voltage acquisition channel is taken as a constant amplitude waveform that remains unchanged during the duration of the reference pulse segment. The square integral of this constant amplitude waveform over the duration of the reference pulse segment is then taken as the lower limit of the norm of the secondary voltage waveform in the reference segment. For the lower limit of the norm of the secondary current waveform in the reference segment, the minimum effective current change amplitude of the secondary current acquisition channel is taken as a constant amplitude waveform that remains unchanged during the duration of the reference pulse segment. The square integral of this constant amplitude waveform over the duration of the reference pulse segment is then taken as the lower limit of the norm of the secondary current waveform in the reference segment. For the lower limit of the norm of the secondary voltage waveform in the incremental segment, the minimum effective voltage change amplitude of the secondary voltage acquisition channel is taken as a constant amplitude waveform that remains unchanged during the duration of the incremental pulse segment. The square integral of this constant amplitude waveform over the duration of the incremental pulse segment is then taken as the lower limit of the norm of the secondary voltage waveform in the incremental segment. Therefore, the lower limit of the secondary voltage waveform norm of the reference segment, the lower limit of the secondary current waveform norm of the reference segment, and the lower limit of the secondary voltage waveform norm of the incremental segment have the same dimensions as the voltage waveform norm or current waveform norm in the corresponding formulas.

[0040] During the commissioning phase of the variable frequency pulse power supply equipment, pre-establish the comparability limits for the reference segment and the secondary voltage comparability limits for the incremental segment: For a set of secondary voltage sampling ranges, secondary current sampling ranges, sampling periods, acquisition channel calibration status, variable frequency pulse power supply power level configurations, pulse widths, pulse repetition periods, and other pulse power supply configurations that are actually in use, keep this set of configurations unchanged during calibration and ensure that the variable frequency pulse power supply does not experience any protection actions. Execute the same control waveform twice consecutively for both the continuous position identification sequence and the recovery position identification sequence, and collect the two repetitive electrical responses under the same identification sequence. For the reference pulse segment, substitute the two repetitive reference pulse responses of the continuous position into the aforementioned calculation relationships for the relative differences of the secondary voltage, secondary current, and electrical response of the reference segment to form the relative differences of the repetitive reference pulse responses of the continuous position; substitute the two repetitive reference pulse responses of the recovery position into the same calculation relationships to form the relative differences of the repetitive reference pulse responses of the recovery position, and define the larger of the two as the comparability limit for the reference segment corresponding to this set of configurations. For the incremental pulse segment, the secondary voltage waveforms of two repeated incremental segments at consecutive positions are substituted into the aforementioned calculation relationship for the relative difference of the secondary voltage of the incremental segment to form the relative difference of the secondary voltage of the repeated incremental segment at consecutive positions. Similarly, the secondary voltage waveforms of two repeated incremental segments at the recovery position are substituted into the same calculation relationship to form the relative difference of the secondary voltage of the repeated incremental segment at the recovery position. The larger of the two values ​​is defined as the comparability limit of the secondary voltage of the incremental segment corresponding to this configuration. Both comparability limits are formed by two repeated responses within the same time position, without using the response difference between the consecutive and recovery positions. This characterizes the normal fluctuations caused by the repeated output of the acquisition link and the frequency converter pulse power supply, without including the actual response differences that may occur between the two time positions themselves in the calibration results.

[0041] During operation, before using comparability limits for current identification, the system reads the current secondary voltage sampling range, secondary current sampling range, sampling period, acquisition channel calibration status, frequency converter pulse power supply power level configuration, current pulse width, current pulse repetition period, and other pulse power supply configurations. It then calls up the corresponding valid reference segment comparability limits and incremental segment secondary voltage comparability limits. If no valid calibration result exists for the current configuration, the system retains the most recent valid pulse power supply timing and recalibrates according to the formation relationship of the reference segment comparability limits and incremental segment secondary voltage comparability limits. Before a new comparability limit is formed, the current acquisition data is not used to form the time migration direction; after a new comparability limit is formed, time position identification is performed again from the subsequent adaptive control cycle; if a valid calibration result exists for the current configuration, the current identification continues.

[0042] Under the condition that the current comparability limit is valid, first compare the electrical responses of the reference pulse segments of the continuous position identification sequence and the recovered position identification sequence. When the relative difference in the electrical responses of the reference segments is greater than the comparability limit of the reference segments, it indicates that there was already an electrical response difference between the continuous position identification sequence and the recovered position identification sequence that exceeded the normal repetitive fluctuation range before the incremental pulse segment was applied. In the current identification cycle, the time-position response comparison of the two incremental pulse segments will no longer be performed, the current valid pulse power supply timing will be maintained, and the time-position identification of the current identification cycle will end. When the relative difference in the electrical responses of the reference segments is not greater than the comparability limit of the reference segments, continue to compare the actual secondary voltages of the two incremental pulse segments. When the relative difference in the secondary voltages of the incremental segments is greater than the secondary voltages of the incremental segments, the comparison will continue. When the comparability limit is reached, it indicates that the difference between the actual incremental pulse secondary voltage excitations formed at the two time positions exceeds the normal repetitive fluctuation range. The current identification cycle does not utilize the secondary current of the two incremental pulse segments to form the time migration direction, maintains the current effective pulse power supply sequence, and ends the time position identification of the current identification cycle. When the relative difference of the electrical response of the reference segment is not greater than the comparability limit of the reference segment, and the relative difference of the secondary voltage of the incremental segment is not greater than the comparability limit of the secondary voltage of the incremental segment, the two incremental pulse segments of the continuous position identification sequence and the recovery position identification sequence have an electrical basis for comparing the secondary current response. Thus, the continuous position incremental segment secondary current waveform and the recovery position incremental segment secondary current waveform that meet the comparability conditions are obtained.

[0043] S4. When both comparisons meet the comparability condition, the secondary current of the incremental pulse segment of the continuous position identification sequence and the recovered position identification sequence are integrated to form the continuous position charge response and the recovered position charge response, respectively. The time position response difference is formed by subtracting the continuous position charge response from the recovered position charge response, and the time migration direction is determined based on the time position response difference.

[0044] Integrating the secondary current waveform of the continuous position increment pulse segment over its full duration yields the continuous position charge response: ; In the formula, For the first Continuous position charge response for each identification cycle; For the first In each identification cycle, the continuous position identification sequence is localized within the incremental pulse segment. Secondary current at the location; This refers to the local time within the incremental pulse segment; For the first The duration of the incremental pulse segment in each identification cycle; This indicates that the secondary current is integrated over time over the duration of the incremental pulse segment; This represents the differential component of the local time of the incremental pulse segment; 0 represents the starting boundary of the local time of the incremental pulse segment. To identify the cycle number, this invention, in the process of forming a continuous position charge response, only accumulates the actual secondary current within the duration of the incremental pulse segment, thus converting the secondary current waveform, which varies with local time, into a charge response characterizing the overall secondary charge transfer degree of that incremental pulse segment. Since the start and end range of integration completely corresponds to the continuous position incremental pulse segment, the resulting continuous position charge response reflects the secondary response formed when the same incremental pulse power supply is applied consecutively immediately after the reference pulse segment, excluding the secondary current in time intervals outside the incremental pulse segment.

[0045] Integrating the secondary current waveform of the incremental segment at the recovered position with the same incremental pulse duration yields the charge response at the recovered position: ; In the formula, For the first Recovery of position charge response per identification cycle; For the first The recovered position identification sequence is localized within the incremental pulse segment during each identification cycle. Secondary current at the location; This refers to the local time within the incremental pulse segment; For the first The duration of the incremental pulse segment in each identification cycle; This indicates that the secondary current is integrated over time over the duration of the incremental pulse segment; This represents the differential component of the local time of the incremental pulse segment; 0 represents the starting boundary of the local time of the incremental pulse segment. To identify the cycle number, this invention employs the same integration duration and integration method as the continuous position charge response during the formation of the recovery position charge response, ensuring that the two charge responses are established on the same time scale. The two incremental pulse segments already have comparable actual secondary voltage excitations, and the secondary currents adopt the same directional convention. Therefore, the continuous position charge response and the recovery position charge response have the same physical dimensions and a clear correspondence, respectively characterizing the secondary charge transfer response formed when the same incremental pulse power supply is applied in the continuous and recovery positions.

[0046] After obtaining the continuous position charge response and the recovered position charge response, the time position response difference is formed according to a fixed order of the recovered position charge response relative to the continuous position charge response: ; In the formula, For the first Time position response difference per recognition cycle; For the first Recovery of position charge response per identification cycle; For the first Continuous position charge response for each identification cycle; The time-position response difference is used for identification period numbering. In the process of forming the time-position response difference, this invention maintains the calculation order of recovering position charge response first, followed by continuous position charge response, throughout different identification periods, giving the sign of the time-position response difference a fixed temporal directional meaning. When the time-position response difference is positive, it indicates that the secondary charge transfer response formed at the recovering position is greater than that at the continuous position; when the time-position response difference is negative, it indicates that the secondary charge transfer response formed at the continuous position is greater than that at the recovering position. Thus, the time-position response difference retains both the magnitude of the response difference between two time positions and the temporal direction corresponding to the response advantage.

[0047] During the commissioning phase of the variable frequency pulse power supply equipment, a charge response dead zone is pre-established. Specifically, for a set of determined secondary current sampling ranges, sampling periods, acquisition channel calibration status, variable frequency pulse power supply power stage configurations, pulse widths, pulse repetition periods, and other pulse power supply configurations, while keeping this set of configurations unchanged and ensuring that the variable frequency pulse power supply does not experience any protection actions, the continuous position identification sequence executes the same incremental pulse control process twice consecutively, and the recovery position identification sequence executes the same incremental pulse control process twice consecutively, using the same incremental pulse segment duration, secondary current acquisition method, and time correction method as the time position identification. Based on the aforementioned integral relationship between the continuous position charge response and the recovery position charge response, the charge responses for the two repeated identifications of the continuous position and the two repeated identifications of the recovery position are generated respectively. The absolute value of the difference between the two charge responses of the continuous position and the two charge responses of the recovery position are calculated, and the larger of the two absolute values ​​of the difference is defined as the charge response dead zone corresponding to this set of configurations. The charge response dead zone is formed only by repeated charge responses at the same time position, without utilizing the difference between the charge response at consecutive positions and the charge response at the recovered position. Therefore, it characterizes the charge response fluctuations caused by the current acquisition conditions and the repeated output of the frequency converter pulse power supply, without taking into account the actual response differences that may exist between the two time positions themselves.

[0048] When identifying the current time position, based on the currently determined secondary current sampling range, sampling period, acquisition channel calibration status, frequency converter pulse power supply power level configuration, current pulse width, current pulse repetition period, and other pulse power supply configurations, the effective charge response dead zone corresponding to that configuration is invoked. If the current pulse width, current pulse repetition period, or any other configuration changes and no corresponding effective charge response dead zone exists, the time migration direction is not formed using the secondary current response of the current two incremental pulse segments. The current effective pulse power supply timing is maintained, and the charge response dead zone is recalibrated according to the current configuration. After a new charge response dead zone is formed, time position identification is performed again from the subsequent adaptive control cycle. If an effective charge response dead zone exists in the current configuration, the comparison of the secondary current response at the two time positions continues.

[0049] Use the time shift direction of the current identification period This is expressed as a comparison between the time-position response difference and the currently effective charge response dead zone: ; In the formula, For the first Mathematical representation of the time migration direction of each identification cycle; For the first Time position response difference per recognition cycle; The effective charge response dead zone corresponding to the current configuration is a non-negative charge quantity; Represents the absolute value of the time-location response difference; This indicates the boundary of the charge response dead zone in the negative direction; +1 indicates that the time transition direction is the recovery position direction; 0 indicates that the current pulse time relationship is maintained; −1 indicates that the time transition direction is the continuous position direction. To identify the cycle number, this invention, in determining the time migration direction, first uses the charge response dead zone to determine whether the amplitude of the response difference between two time positions exceeds the normal fluctuations caused by repeated acquisition and output at the same time position. When the absolute value of the response difference between the time positions is not greater than the charge response dead zone, the response difference between the two time positions is insufficient to distinguish them from normal fluctuations, thus maintaining the current pulse time relationship; when the response difference exceeds the charge response dead zone, the positive and negative directions of the retained time position response difference are used to determine the migration direction, where the positive direction corresponds to the recovery position and the negative direction corresponds to the continuous position. Thus, the charge response dead zone plays a role in filtering the response difference amplitude, and the sign of the time position response difference plays a role in determining the migration direction; together, they form a unique time migration direction for the current identification cycle.

[0050] S5. Form a pulse time allowable domain according to the time migration direction: the difference between the candidate pulse repetition period and the candidate pulse width is not less than the minimum allowable pulse off time; in the recovery position direction, the candidate pulse width is not greater than the current pulse width and the candidate pulse repetition period is not less than the current pulse repetition period; in the continuous position direction, the candidate pulse width is not less than the current pulse width and the candidate pulse repetition period is not greater than the current pulse repetition period; update the current effective pulse power supply timing within the pulse time allowable domain.

[0051] Once the time transition direction of the current identification cycle is determined, the minimum allowable pulse width, maximum allowable pulse width, minimum allowable pulse repetition period, maximum allowable pulse repetition period, and minimum allowable pulse off time in the variable frequency pulse power supply design configuration are read. In the executable pulse time parameter combinations, the pulse width should be between the minimum and maximum allowable pulse widths, the pulse repetition period should be between the minimum and maximum allowable pulse repetition periods, and the pulse off time formed by the time difference between the pulse repetition period and the pulse width should not be less than the minimum allowable pulse off time.

[0052] When the time transition direction of the current identification cycle is the recovery position direction, the pulse time allowable domain satisfies: ; In the formula, For the first The pulse time allowable domain formed when the time migration direction is the recovery position direction in each identification cycle; symbol It represents the set consisting of candidate pulse time parameter combinations that satisfy all constraints; The candidate pulse width; The candidate pulse repetition period; Minimum permissible pulse width in the design configuration of a variable frequency pulse power supply; For the first The current pulse width for each identification cycle; For the first The current pulse repetition period of each identification cycle; The maximum permissible pulse repetition period in the design configuration of a variable frequency pulse power supply; Minimum permissible pulse off-time in the design configuration of a variable frequency pulse power supply; To identify the cycle number, when the time migration direction is the recovery position direction, the candidate pulse width can only maintain the current pulse width or change in a decreasing direction, and the candidate pulse repetition period can only maintain the current pulse repetition period or change in a increasing direction, and the pulse shutdown time formed by both is always not lower than the equipment's allowable lower limit. Therefore, after the incremental pulse power supply effect migrates to the recovery position, the candidate pulse time parameters are formed in the direction of decreasing continuous power-on time and increasing inter-pulse recovery time; when the pulse repetition period increases, the corresponding pulse repetition frequency decreases. Only the pulse width and pulse repetition period combination that simultaneously satisfies all constraints in the pulse time allowable domain corresponding to the recovery position direction enters that pulse time allowable domain.

[0053] When the time transition direction of the current identification cycle is a continuous position direction, the pulse time allowable domain satisfies: ; In the formula, For the first The pulse time allowable domain formed when the time migration direction is a continuous position direction in each identification cycle; symbol It represents the set consisting of candidate pulse time parameter combinations that satisfy all constraints; The candidate pulse width; The candidate pulse repetition period; For the first The current pulse width for each identification cycle; The maximum permissible pulse width in the design configuration of a variable frequency pulse power supply; Minimum permissible pulse repetition period in the design configuration of a variable frequency pulse power supply; For the first The current pulse repetition period of each identification cycle; Minimum permissible pulse off-time in the design configuration of a variable frequency pulse power supply; To identify the cycle number, when the time transition direction is a continuous position direction, the candidate pulse width can only maintain the current pulse width or change in the increasing direction, and the candidate pulse repetition period can only maintain the current pulse repetition period or change in the decreasing direction. Simultaneously, the minimum allowable pulse off-time still limits the degree to which the two time parameters can change together. Therefore, after the incremental pulse power supply action transitions to a continuous position, the candidate pulse time parameters are formed along the direction of increasing continuous power-on time and decreasing inter-pulse recovery time; when the pulse repetition period decreases, the corresponding pulse repetition frequency increases. The pulse off-time constraint ensures that the increase in pulse width and the decrease in pulse repetition period will not create a time combination that the device cannot execute.

[0054] The current identification cycle's time transition direction is to maintain the current pulse time relationship, continue using the current pulse width and current pulse repetition period, without re-forming candidate values ​​for the same time parameters, and continue executing the current valid pulse power supply timing.

[0055] When it is necessary to change the current pulse time relationship, the minimum adjustment unit of pulse width and the minimum adjustment unit of pulse repetition period stored by the frequency converter pulse power supply controller respectively limit the minimum amount of change that the two time parameters can be stably executed. The minimum adjustment unit of pulse width is determined by the timing resolution of the controller and the pulse width resolution capability that the frequency converter pulse power supply can stably execute. The minimum adjustment unit of pulse repetition period is determined by the timing resolution of the controller and the pulse repetition period resolution capability that can stably execute.

[0056] When it is necessary to change the current pulse time relationship, candidate power supply operation parameters are directly generated within the pulse time allowable domain corresponding to the current time migration direction. Specifically: When the time migration direction is the recovery position direction, without exceeding the pulse time allowable range corresponding to the recovery position direction, the current pulse width is adjusted by one minimum pulse width adjustment unit in the decreasing direction, and the current pulse repetition period is adjusted by one minimum pulse repetition period adjustment unit in the increasing direction; if the current pulse width has reached the minimum allowable pulse width, the current pulse width remains unchanged; if the current pulse repetition period has reached the maximum allowable pulse repetition period, the current pulse repetition period remains unchanged; if one time parameter can no longer be adjusted in the corresponding direction while the other time parameter can still be adjusted within the pulse time allowable range, only the time parameter that can still be adjusted is adjusted by one minimum adjustment unit in the corresponding direction. When neither time parameter can be adjusted in the corresponding direction, the current valid pulse power supply timing continues to be executed. When the time transition direction is a continuous position direction, without exceeding the pulse time allowable range corresponding to the continuous position direction, the current pulse width is adjusted by one minimum adjustment unit in the increasing direction, and the current pulse repetition period is adjusted by one minimum adjustment unit in the decreasing direction. If the adjusted pulse width and pulse repetition period still fall within the pulse time allowable range corresponding to the continuous position direction, they are used as candidate time parameters; if the adjusted pulse width and pulse repetition period do not fall within the pulse time allowable range corresponding to the continuous position direction, the current valid pulse power supply timing continues to be executed, and no candidate time parameters exceeding the pulse time allowable range are formed. When candidate time parameters are formed by one minimum adjustment unit, the remaining power supply settings that have not participated in the current time adjustment continue to use the current valid values, thus forming candidate power supply operation parameters.

[0057] After candidate power supply operating parameters are formed, the current protection interlock status is confirmed in real time before being written to the frequency converter pulse power supply controller. If the current protection interlock is not in an activated state, the candidate power supply operating parameters are written to the frequency converter pulse power supply controller, and the frequency converter pulse power supply operates according to the candidate power supply operating parameters, which are then used as the new currently valid power supply operating parameters. If the current protection interlock is already in an activated state, no candidate power supply operating parameters are written, and the current valid power supply operating parameters are maintained. This real-time confirmation occurs before the candidate parameters are actually executed and is used to reflect possible changes in the protection status that may occur between the execution of the two identification sequences and the formation of the candidate parameters.

[0058] During the actual execution of the new power supply operation parameters, the existing overvoltage, overcurrent and other electrical protections of the frequency converter pulse power supply continue to perform protection based on the actual secondary voltage and actual secondary current. When the protection action is triggered during actual operation, the frequency converter pulse power supply enters the corresponding protection state and pauses the new time position identification until the protection state is released.

[0059] After the power supply operating parameters are updated, the frequency converter pulse power supply continues to operate according to the new currently valid power supply operating parameters; if no new candidate power supply operating parameters are formed, it continues to operate according to the original currently valid power supply operating parameters. When the next adaptive control cycle arrives, and the frequency converter pulse power supply and electrical signal acquisition conditions allow for time position identification, time position identification is performed again based on the current valid pulse power supply status.

[0060] This invention also discloses an adaptive operating condition system for a variable frequency pulse power supply for an electrostatic precipitator, comprising a processor and a memory. The memory stores computer program instructions, which, when executed by the processor, implement an adaptive operating condition method for a variable frequency pulse power supply for an electrostatic precipitator according to the present invention.

[0061] The system also includes other components well known to those skilled in the art, such as communication buses and communication interfaces, the settings and functions of which are known in the art and will not be described in detail here.

[0062] In the description of this specification, "multiple" or "several" means at least two, such as two, three or more, unless otherwise expressly and specifically defined.

[0063] While this specification has shown and described numerous embodiments of the invention, it will be apparent to those skilled in the art that such embodiments are provided by way of example only. Many modifications, alterations, and alternatives will occur to those skilled in the art without departing from the spirit and essence of the invention. It should be understood that various alternatives to the embodiments of the invention described herein may be employed in the practice of this invention.

Claims

1. A method for adaptive operation of a variable frequency pulse power supply for an electrostatic precipitator, characterized in that, include: Divide the current pulse control waveform into incremental pulse segments from the tail end, and take the part before the incremental pulse segments as the reference pulse segments; An incremental pulse segment is applied immediately after the reference pulse segment to form a continuous position identification sequence; After the reference pulse segment, the pulse control component is stopped and an incremental pulse segment is applied at the start of the next pulse to form a recovered position identification sequence. Execute the continuous position identification sequence and the restored position identification sequence respectively. Calculate the relative difference of the secondary voltage of the reference segment based on the secondary voltage waveforms of the reference pulse segments in the continuous and restored position identification sequences. Calculate the relative difference of the secondary current of the reference segment based on the secondary current waveforms of the reference pulse segments in the continuous and restored position identification sequences. Take the maximum value of the relative difference of the secondary voltage and the relative difference of the secondary current of the reference segment as the relative difference of the electrical response of the reference segment. When the relative difference of the electrical response of the reference segment is not greater than a predetermined comparability limit for the reference segment, calculate the relative difference of the secondary voltage of the incremental segment based on the secondary voltage waveforms of the incremental pulse segments in the continuous and restored position identification sequences. When the relative difference of the secondary voltage of the incremental segment is not greater than a predetermined comparability limit for the secondary voltage of the incremental segment, it is determined that both the comparison of the electrical response of the reference pulse segment and the actual secondary voltage of the incremental pulse segment meet the comparability condition. When both comparisons meet the comparability condition, the secondary current of the incremental pulse segment of the continuous position identification sequence and the recovered position identification sequence are integrated to form the continuous position charge response and the recovered position charge response, respectively. The time position response difference is formed by subtracting the continuous position charge response from the recovered position charge response. When the time position response difference is greater than the charge response dead zone, the time migration direction is determined as the recovered position direction. When the time position response difference is less than the negative value of the charge response dead zone, the time migration direction is determined as the continuous position direction. When the absolute value of the time position response difference is not greater than the charge response dead zone, the current pulse time relationship is maintained. When the time migration direction is the recovery position direction or the continuous position direction, the pulse time allowable domain is formed according to the time migration direction: the difference between the candidate pulse repetition period and the candidate pulse width is not less than the minimum allowable pulse off time; In the restored position direction, the candidate pulse width is not greater than the current pulse width, and the candidate pulse repetition period is not less than the current pulse repetition period; In continuous position directions, the candidate pulse width is not less than the current pulse width, and the candidate pulse repetition period is not greater than the current pulse repetition period; Update the current valid pulse power supply timing within the pulse time allowable domain; While maintaining the current pulse timing relationship, continue executing the current valid pulse power supply timing sequence.

2. The adaptive operating condition method for a variable frequency pulse power supply for an electrostatic precipitator according to claim 1, characterized in that, The step of dividing the current pulse control waveform into incremental pulse segments and using the portion before the incremental pulse segments as the reference pulse segments includes: The minimum adjustment unit of pulse width that the controller of the variable frequency pulse power supply can actually execute is taken as the duration of the incremental pulse segment. An incremental pulse segment with a duration equal to the duration of the incremental pulse segment is divided from the tail of the current pulse control waveform. The part of the current pulse control waveform before the incremental pulse segment is taken as the reference pulse segment. The reference pulse segment adopts the original control waveform in the current effective pulse power supply sequence, and the incremental pulse segment adopts the control waveform divided from the tail of the current pulse control waveform, so that the pulse formed when the reference pulse segment and the incremental pulse segment are applied continuously is consistent with the normal pulse in the current effective pulse power supply sequence.

3. The adaptive operating condition method for a variable frequency pulse power supply for an electrostatic precipitator according to claim 1, characterized in that, The method for restoring the location identification sequence is as follows: When executing the recovery position identification sequence, the next normal pulse that should have started at the boundary of the current pulse repetition cycle is replaced by an incremental pulse segment. After the incremental pulse segment ends, the pulse control component remains off until the start time of the next complete normal pulse, at which point the current effective pulse power supply timing is restored.

4. The adaptive operating condition method for a variable frequency pulse power supply for an electrostatic precipitator according to claim 1, characterized in that, The steps of executing the continuous position identification sequence and the recovered position identification sequence respectively also include: Using the same secondary voltage acquisition channel, secondary current acquisition channel, sampling period, and triggering rules, the secondary voltage and secondary current of the reference pulse segment and incremental pulse segment in the continuous position identification sequence and the recovered position identification sequence are acquired respectively. The secondary voltage sampling time and secondary current sampling time are corrected according to the fixed acquisition delays that are predetermined and stored for the secondary voltage acquisition channel and the secondary current acquisition channel during the equipment calibration stage. The local time of the reference pulse segment is established with the start time of the reference pulse segment of each of the continuous position identification sequence and the recovered position identification sequence, and the local time of the incremental pulse segment is established with the start time of the incremental pulse segment of each of the two sequences, forming the secondary voltage waveform, the secondary current waveform, the secondary voltage waveform, and the secondary current waveform of the incremental pulse segment.

5. The adaptive operating condition method for a variable frequency pulse power supply for an electrostatic precipitator according to claim 1, characterized in that, The method for obtaining the comparability limit of the benchmark segment is as follows: Under the same calibration configuration, the same control waveform was executed twice for both the continuous position identification sequence and the recovered position identification sequence. For the reference pulse segment, the relative difference in electrical response of the reference segment between two repeated reference pulse responses at consecutive positions and the relative difference in electrical response of the reference segment between two repeated reference pulse responses at the recovery position are respectively formed, and the maximum value of the two is used as the reference segment comparability limit; The method for obtaining the comparability limit of the incremental segment secondary voltage is as follows: For the incremental pulse segment, the relative difference of the incremental segment secondary voltage between the two repeated incremental segment secondary voltage waveforms at consecutive positions and the relative difference of the incremental segment secondary voltage between the two repeated incremental segment secondary voltage waveforms at the recovery position are respectively formed, and the larger of the two is used as the comparability limit of the incremental segment secondary voltage.

6. The adaptive operating condition method for a variable frequency pulse power supply for an electrostatic precipitator according to claim 1, characterized in that, The method for obtaining the charge response dead zone is as follows: Under the same calibration configuration, the continuous position identification sequence executes the same incremental pulse control process twice, and the recovery position identification sequence executes the same incremental pulse control process twice, respectively forming the charge response of the continuous position twice repeated identification and the charge response of the recovery position twice repeated identification. The absolute value of the difference between the two charge responses of the continuous position and the absolute value of the difference between the two charge responses of the recovery position are calculated, and the maximum value of the two absolute values ​​of difference is taken as the charge response dead zone.

7. The adaptive operating condition method for a variable frequency pulse power supply for an electrostatic precipitator according to claim 1, characterized in that, The step of updating the current valid pulse power supply timing within the pulse time allowable domain includes: When the time migration direction is the recovery position direction, within the pulse time allowable domain, the current pulse width, which can be adjusted in the decreasing direction, is reduced by one pulse width minimum adjustment unit, and the current pulse repetition period, which can be adjusted in the increasing direction, is increased by one pulse repetition period minimum adjustment unit; if only one of the current pulse width and the current pulse repetition period can continue to be adjusted, only the time parameter that can continue to be adjusted is adjusted. When the time migration direction is a continuous position direction, if the current pulse width can be adjusted by one minimum pulse width adjustment unit in the increasing direction within the pulse time allowable domain, and the current pulse repetition period can be adjusted by one minimum pulse repetition period adjustment unit in the decreasing direction within the pulse time allowable domain, then the current pulse width is increased by one minimum pulse width adjustment unit, and the current pulse repetition period is decreased by one minimum pulse repetition period adjustment unit. Candidate power supply operation parameters are generated based on the adjusted current pulse width and current pulse repetition period. When the candidate power supply operation parameters meet the pulse time allowable range and the current protection interlock is not in operation, the candidate power supply operation parameters are written into the frequency converter pulse power controller and used as the new current valid power supply operation parameters.

8. A condition-adaptive system for a variable frequency pulse power supply for an electrostatic precipitator, characterized in that, include: A processor and a memory, the memory storing computer program instructions that, when executed by the processor, implement the adaptive operating condition method for a variable frequency pulse power supply for an electrostatic precipitator according to any one of claims 1-7.

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