CN217181144U - Comprehensive testing device for fusing characteristic of high-voltage fuse - Google Patents
Comprehensive testing device for fusing characteristic of high-voltage fuse Download PDFInfo
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- CN217181144U CN217181144U CN202123049403.XU CN202123049403U CN217181144U CN 217181144 U CN217181144 U CN 217181144U CN 202123049403 U CN202123049403 U CN 202123049403U CN 217181144 U CN217181144 U CN 217181144U
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Abstract
The utility model discloses a comprehensive testing device for fusing characteristics of a high-voltage fuse, which is arranged between an alternating current voltage source and the high-voltage fuse and comprises a rectifier bridge circuit, a full-bridge inverter circuit, an LC filter circuit, a transformer, a fuzzy PI and a repetitive control composite circuit; the rectifier bridge circuit, the full-bridge inverter circuit, the LC filter circuit and the transformer are sequentially connected in series, the rectifier bridge circuit is further connected with the alternating current voltage source, and the transformer is further connected with the high-voltage fuse; the fuzzy PI and repetitive control composite circuit is connected with the full-bridge inverter circuit and is also connected between the transformer and the high-voltage fuse. The utility model discloses dynamic property is good, the stable state precision is good, stability is high, the security is good.
Description
Technical Field
The utility model belongs to the technical field of the fuse detects, concretely relates to high-voltage fuse fusing characteristic integrated test device.
Background
At present, the engineering industry generally adopts a mode of short circuit of a secondary side of an adjustable autotransformer to obtain large current to carry out fuse fusing characteristic test, and has the defects of long adjusting time, poor adjusting precision, inaccurate timing, incapability of outputting a current-time characteristic curve and the like. Engineering and academia correspondingly explore the testing device or instrument for the fusing characteristic of the high-voltage fuse, and some achievements are obtained, but the testing device or instrument generally does not enter a prototype or product stage and only stays at a concept or design stage. At present, similar products are not found in China, and a corresponding detection means is lacked for the problems of whether the current-time characteristic of the high-voltage fuse is qualified or not, whether the current-time characteristic is consistent with a nameplate mark or not, whether the current-time characteristic meets the operation requirement or not and the like.
The alternating current high-voltage fuse can melt a melt due to self heating after the current exceeds a specified value for a certain time, so that a circuit is switched off. The high-voltage fuse is widely applied to a power system, particularly a power distribution network, and the detection of the fusing characteristic and the performance parameter of the high-voltage fuse has important significance for ensuring the safe operation of the power grid, particularly the power distribution network.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a high-voltage fuse fusing characteristic integrated test device to the not enough of prior art existence. The utility model discloses a testing arrangement tests fusing characteristic based on fuzzy PI + repetitive control's method, improves electric current wide range and high accuracy output, ensures stability, security and the precision of test.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a comprehensive testing device for fusing characteristics of a high-voltage fuse is arranged between an alternating-current voltage source and the high-voltage fuse and comprises a rectifier bridge circuit, a full-bridge inverter circuit, an LC filter circuit, a transformer, a fuzzy PI and repetitive control composite circuit; the rectifier bridge circuit, the full-bridge inverter circuit, the LC filter circuit and the transformer are sequentially connected in series, the rectifier bridge circuit is further connected with the alternating current voltage source, and the transformer is further connected with the high-voltage fuse; the fuzzy PI and repetitive control composite circuit is connected with the full-bridge inverter circuit and is also connected between the transformer and the high-voltage fuse.
The utility model discloses explain further, the rectifier bridge circuit be used for with the power frequency commercial power of alternating current voltage source input turns into direct current and output.
The utility model discloses explain further, the fuzzy PI and repetitive control composite circuit includes fuzzy PI controller, repetitive controller, current error comparator, driver, current rising ware; the fuzzy PI controller and the repetitive controller are connected in parallel and are burnt in the DSP, the current of the current transformer on the fuse side is collected, is subjected to A/D conversion and then is sent to a current error comparator in the DSP for comparison, the difference value and the change rate of the difference value are sent to a fuzzy PI and repetitive control composite circuit for operation, the DSP outputs a control signal to a driver, and the driver drives a switching tube; the output ends of the comparator and the driver are connected to the switching tube of the full-bridge inverter circuit; the negative input end of the current error comparator is connected between the output end of the current booster and the tested high-voltage fuse, the positive input end of the current error comparator is connected with preset current, and the output end of the current error comparator is connected with the comparator and the driver and used for carrying out error comparison and amplification on load current generated by the output end of the current booster and the preset current for completing parameter setting through a human-computer interaction interface.
The bipolar triangular wave and the modulation wave are applied to a comparator to generate an SPWM pulse signal. The advantages of good dynamic performance of fuzzy PI control and high periodic disturbance gain of repetitive control are combined. And writing the two composite control strategies for controlling parallel connection into the DSP-TMS320F28335 to output control signals.
The utility model discloses further explain, the said fuzzy PI controller is made up of fuzzy controller and PI controller, have strong robustness; the fuzzy PI controller combines a fuzzy rule and a fuzzy subset according to the difference of the reference current error and the error change rate, obtains the fuzzy quantity output of the PI control coefficient by applying an inference algorithm, and obtains the accurate quantity output of the PI control coefficient by a de-fuzzy algorithm.
The utility model discloses further explain, fuzzy PI and repetitive control combined circuit carry out following composite control method, include:
step one, the difference e between the preset current value of the testing device and the load current output quantity and the change rate e of the difference e are calculated c As an input variable of a two-dimensional fuzzy controller to calculate a first control signal; calculating a second control signal by taking a difference e between a preset current value of the testing device and the load current output quantity as an input variable of the repetitive controller; summing the first control signal and the second control signal to generate a corresponding pulse signal to drive a switching tube of the full-bridge inverter circuit so as to adjust the output voltage of the full-bridge inverter circuit;
secondly, the fuzzy PI controller modifies the PI controller parameters on line by using a fuzzy control principle, and the PI controller parameters are self-adaptively adjusted according to an input error signal and a fuzzy rule of preset current so as to realize the rapid dynamic response of the testing device when the load fluctuates, and no overshoot phenomenon exists in the response process;
and step three, the repetitive controller performs phase compensation on the internal model structure of the periodic harmonic current and the amplitude of the control object according to an internal model control principle so as to realize zero tracking error of the constant current source inverter in a load steady state.
The utility model discloses explain further, fuzzy PI controller has increased the scale factor at input/output port, with high-power constant current source output current and preset current error e and error rate of change e c The range of variation is defined as the domain of discourse on the fuzzy set as e, e c -6, -4, -2, 0, 2, 4, 6, with fuzzy subset e, e c The basic domains of deltakp and deltaki of output KP and KI are [ -6, 6}, wherein { NB, NM, NS, O, PS, PM, PB }, and the deltakp and the deltaki are both output]In fuzzy controllers e and e c Adopting gauss membership function, and adopting trimf (triangle) for delta KP and delta KI) Membership function, a mamdani algorithm is adopted in a synthetic inference algorithm, and a gravity center method (weighted average method) is adopted in a fuzzy solving algorithm.
The utility model further explains that the third step comprises an internal mold link, a delay link and a compensation link;
the internal model link is an internal model part of harmonic current, and an internal model of any subharmonic current in a fundamental wave period is constructed according to the condition that each component frequency of the harmonic current is a multiple of the fundamental wave current; in order to ensure the stability and the compensation precision of the system, an internal model coefficient Q (z) is 0.9;
the delay link delays the control output signal for one cycle to execute, namely the error information detected in the cycle begins to be output in the next cycle, and equivalent advance can be achieved;
the compensation link is used for compensating the amplitude and the phase of the controlled object, so that the current has no failure of the amplitude and no lag in the phase at the middle and low frequency bands, and the rapid attenuation at the high frequency band ensures the stability and the compensation precision of the repetitive controller.
The characteristic relationship between the short-circuit current of the fuse and the melting time is generally referred to as ampere-second characteristic, and the melting time of the melt is also referred to as pre-arc time. The melts corresponding to different rated currents all have different ampere-second characteristic curves. The ampere-second characteristic curve of the melt is an inverse time limit curve, and when the current flowing through the melt is large, the fusing time is short; on the contrary, when the current is small, the time for fusing is long. High-voltage fuse fusing characteristic testing arrangement is connected with current relay, fuse anchor clamps and current transformer on the series circuit of current rise ware, current relay's output contact establishes ties to the time-recorder, and the time-recorder is parallelly connected with current relay, has the ampere meter in current transformer department parallel connection, has the voltmeter in fuse anchor clamps department parallel connection, and high-voltage fuse establishes ties in fuse anchor clamps. Because adopt current measurement timing circuit, under the power frequency voltage that is far less than high-voltage fuse fusing voltage elimination voltage and too high the influence to the fuse, treat that test fuse both ends add different current values, time through current sampling timing device, can simulate out the characteristic curve and the correlation technique data of this model fuse afterwards.
Compared with the prior art, the utility model discloses following beneficial effect has:
1. the dynamic performance is good, the repetitive controller does not work due to the fact that the response time lags one cycle when the load fluctuates, the fuzzy PI controller quickly tracks load changes due to the advantages of strong robustness and high response speed, and the constant current inverter can quickly control the load current without overshoot or impact current.
2. The stable state precision is good, when the load is stable, the repetitive controller plays a leading role in the composite controller because of no stable state tracking error of the load current, the optimal precision control of the load current by the testing device is ensured, and the fuzzy PI controller hardly plays a role in the composite controller because of small input tracking error.
3. The stability is high, the strong robustness of the fuzzy PI controller and the reasonable design of the internal model and the compensation link of the repetitive controller enable the control system to be greatly deviated from an unstable area, and the inverter can be ensured to stably run for a long time.
4. The safety is good, and the optimal dynamic and steady-state response fully ensures the safety and reliability of the system.
Drawings
Fig. 1 is a schematic diagram of a circuit structure framework according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a frame of a testing portion according to an embodiment of the present invention.
Fig. 3 is a composite control block diagram of a composite control method according to an embodiment of the present invention.
Fig. 4 is a control block diagram of the fuzzy PI controller according to an embodiment of the present invention.
Fig. 5 is a control block diagram of a repetitive controller according to an embodiment of the present invention.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings.
Example (b):
as shown in fig. 1, a comprehensive testing device for fusing characteristics of a high-voltage fuse is arranged between an alternating-current voltage source and the high-voltage fuse and comprises a rectifier bridge circuit, a full-bridge inverter circuit, an LC filter circuit, a transformer, a fuzzy PI and repetitive control composite circuit; the rectifier bridge circuit, the full-bridge inverter circuit, the LC filter circuit and the transformer are sequentially connected in series, the rectifier bridge circuit is further connected with the alternating current voltage source, and the transformer is further connected with the high-voltage fuse; the fuzzy PI and repetitive control composite circuit is connected with the full-bridge inverter circuit and is also connected between the transformer and the high-voltage fuse.
Specifically, the rectifier bridge circuit is used for converting the power frequency commercial power input by the alternating current voltage source into direct current and outputting the direct current.
Specifically, the fuzzy PI and repetitive control composite circuit comprises a fuzzy PI controller, a repetitive controller, a current error comparator, a driver and a current booster; the fuzzy PI controller and the repetitive controller are connected in parallel and are burnt in the DSP, the current of the current transformer on the fuse side is collected, is subjected to A/D conversion and then is sent to a current error comparator in the DSP for comparison, the difference value and the change rate of the difference value are sent to a fuzzy PI and repetitive control composite circuit for operation, the DSP outputs a control signal to a driver, and the driver drives a switching tube; the output ends of the comparator and the driver are connected to the switching tube of the full-bridge inverter circuit; the negative input end of the current error comparator is connected between the output end of the current booster and the tested high-voltage fuse, the positive input end of the current error comparator is connected with the preset current, and the output end of the current error comparator is connected with the comparator and the driver and used for comparing and amplifying the error of the load current generated by the output end of the current booster and the preset current for completing parameter setting through a human-computer interaction interface.
Specifically, the fuzzy PI controller consists of a fuzzy controller and a PI controller, and has strong robustness; the fuzzy PI controller combines a fuzzy rule and a fuzzy subset according to the difference of the reference current error and the error change rate, obtains the fuzzy quantity output of the PI control coefficient by applying an inference algorithm, and obtains the accurate quantity output of the PI control coefficient by a de-fuzzy algorithm.
As shown in fig. 2, the fuzzy PI and repetitive control complex circuit performs the following complex control method, including:
step one, the difference e between the preset current value of the testing device and the load current output quantity and the change rate e of the difference e are calculated c As an input variable of a two-dimensional fuzzy controller to calculate a first control signal; calculating a second control signal by taking a difference e between a preset current value of the testing device and the load current output quantity as an input variable of the repetitive controller; summing the first control signal and the second control signal to generate a corresponding pulse signal to drive a switching tube of the full-bridge inverter circuit so as to adjust the output voltage of the full-bridge inverter circuit;
secondly, the fuzzy PI controller utilizes a fuzzy control principle to modify PI controller parameters on line, and the PI controller parameters are self-adaptively set according to an input error signal and a fuzzy rule of preset current so as to realize the rapid dynamic response of the testing device during load fluctuation, and no overshoot phenomenon exists in the response process;
and step three, the repetitive controller performs phase compensation on the internal model structure of the periodic harmonic current and the amplitude of the control object according to an internal model control principle so as to realize zero tracking error of the testing device in a load steady state.
As shown in fig. 3, the fuzzy PI controller adds a scaling factor to the input/output port to adjust the error e and the error change rate e between the output current of the testing device and the preset current c The range of variation is defined as the domain of discourse on the fuzzy set as e, e c -6, -4, -2, 0, 2, 4, 6, with fuzzy subset e, e c The basic domains of deltakp and deltaki output KP and KI are [ -6, 6 ] for { NB, NM, NS, O, PS, PM, PB }, respectively]In fuzzy controllers e and e c The method is characterized in that a gauss (gaussian) membership function is adopted, trimf (triangular) membership functions are adopted for delta KP and delta KI, a mamdani algorithm is adopted for a synthetic inference algorithm, and a gravity center method (weighted average method) is adopted for a fuzzy solution algorithm.
As shown in fig. 4, the third step includes an internal model link, a delay link and a compensation link;
the internal model link is an internal model part of harmonic current, and an internal model of any subharmonic current in a fundamental wave period is constructed according to the condition that each component frequency of the harmonic current is a multiple of the fundamental wave current; in order to ensure the stability and the compensation precision of the system, an internal model coefficient Q (z) is 0.9;
the delay link delays the control output signal for one cycle to execute, namely the error information detected in the cycle begins to be output in the next cycle, and equivalent advance can be achieved;
the compensation link is used for compensating the amplitude and the phase of the controlled object, so that the current has no failure in amplitude and no lag in phase in the middle and low frequency range, and the current is quickly attenuated in the high frequency range, thereby ensuring the stability and the compensation precision of the repetitive controller.
It should be understood that the above-described embodiments are merely examples for clearly illustrating the present invention and are not intended to limit the practice of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description; this is not necessary, nor exhaustive, of all embodiments; and obvious changes and modifications can be made without departing from the scope of the present invention.
Claims (4)
1. The utility model provides a high-voltage fuse fusing characteristic integrated test device, sets up between alternating voltage source and high-voltage fuse, its characterized in that: the system comprises a rectifier bridge circuit, a full-bridge inverter circuit, an LC filter circuit, a transformer, a fuzzy PI and repetitive control composite circuit; the rectifier bridge circuit, the full-bridge inverter circuit, the LC filter circuit and the transformer are sequentially connected in series, the rectifier bridge circuit is further connected with the alternating current voltage source, and the transformer is further connected with the high-voltage fuse; the fuzzy PI and repetitive control composite circuit is connected with the full-bridge inverter circuit and is also connected between the transformer and the high-voltage fuse.
2. The device for comprehensively testing the fusing characteristics of a high-voltage fuse according to claim 1, wherein: and the rectifier bridge circuit is used for converting the power frequency commercial power input by the alternating current voltage source into direct current and outputting the direct current.
3. The device for comprehensively testing the fusing characteristics of a high-voltage fuse according to claim 1, wherein: the fuzzy PI and repetitive control composite circuit comprises a fuzzy PI controller, a repetitive controller, a current error comparator, a driver and a current booster; wherein the fuzzy PI controller is connected with the repetitive controller in parallel;
the negative input end of the current error comparator is connected with the output end of the current booster, the positive input end of the current error comparator is connected with the preset current, and the output end of the current error comparator is connected with the comparator and the driver and used for comparing and amplifying the error of the load current generated by the output end of the current booster and the preset current for completing parameter setting through a human-computer interaction interface.
4. The device for comprehensively testing the fusing characteristics of a high-voltage fuse according to claim 3, characterized in that: the fuzzy PI controller consists of a fuzzy controller and a PI controller and has strong robustness.
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| CN114280471A (en) * | 2021-12-07 | 2022-04-05 | 广西电网有限责任公司防城港供电局 | A comprehensive test device for high-voltage fuse fusing characteristics |
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| CN114280471A (en) * | 2021-12-07 | 2022-04-05 | 广西电网有限责任公司防城港供电局 | A comprehensive test device for high-voltage fuse fusing characteristics |
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