CN206401896U - A kind of parallel power wave filter monitoring and protecting device based on multi-channel sampling - Google Patents
A kind of parallel power wave filter monitoring and protecting device based on multi-channel sampling Download PDFInfo
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- CN206401896U CN206401896U CN201720048741.6U CN201720048741U CN206401896U CN 206401896 U CN206401896 U CN 206401896U CN 201720048741 U CN201720048741 U CN 201720048741U CN 206401896 U CN206401896 U CN 206401896U
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
A kind of parallel power wave filter monitoring and protecting device based on multi-channel sampling, including：The voltage acquisition module being connected with bus or 220V/380V major loops, the bus voltage signal of bus where for measuring parallel power wave filter；The current acquisition module being connected with this section of total input-wire Current Transformer Secondary side, the current signal for measuring this section of total input-wire；Each filter branch current acquisition module being connected respectively with the Current Transformer Secondary side of each filter branch；The electric current of collection, voltage signal are fundametal compoment and each higher harmonic components through Fast Fourier Transform (FFT) by DSP digital signal processing modules, calculate parameters of electric power, parallel power filter filtering performance computing unit calls the calculating data in primary harmonic parameter calculation unit, with reference to the parameter index in parallel power filter filtering performance computing unit, compare and show that each harmonic of parallel power wave filter filters out ability.The harmonic wave situation occurred of analysis electric power system, protects parallel power filter apparatus in real time.
Description
Technical field
The utility model is related to a kind of parallel power wave filter monitoring and protecting device based on multi-channel sampling, belongs to electric energy
Quality technology field.
Background technology
With non-linear equipments such as fairing, frequency converter, Switching Power Supply, electric arc heated equipment, gas discharge class light sources
More and more come into operation, generate a large amount of harmonic waves for jeopardizing power network and electrical equipment safe operation.In addition traditional transformation
Device or iron-core reactor can also produce harmonic wave.Therefore it is accomplished by installing the filter of all kinds of active or passive parallel electric power in power system
Ripple device, for filtering out the higher hamonic wave in power system, while the loss of supply transformer and conveying circuit can also be reduced, is carried
High power supply quality, improves power supply environment.So parallel power wave filter be in power supply system one it is very important
Position.Rational design, installing parallel power wave filter, can effectively reduce the harmonic content in electric power system, make power network matter
Amount is improved.However, such as selection or improper use, it is also possible to cause the systematic parameter resonance under particular harmonic frequency, damage other
Situations such as electrical equipment, occurs.
The parallel power wave filter species come into operation at present is more, and the parallel power wave filter partly come into operation is used
The time limit is longer, equipment also progressively aging, and parallel power wave filter seldom goes the survey of carry out system again after putting into operation
Examination.In electric power system, electrical equipment has a large change when may also be compared with electric power system initial design, and parallel power wave filter
Less to change, these factors may all cause the filtering performance of parallel power wave filter to decline.Due to design defect, some are simultaneously
Connection electric-power filter can cause component parameters to change after being used for a long time, and be more likely to result in the generation of resonance phenomena, jeopardize power network
Safety.
There are the instrument of many measurement harmonic waves, such as FLUKE 1760, but most harmonic detecting instruments in the market
Single current and voltage detecting passage is only provided to carry out the detection of harmonic current, harmonic voltage.If it is desired to aligning in use
Parallel power wave filter carry out performance test, then system and parallel power wave filter separately must be tested respectively.And
And because the load of electric power system is continually changing, it is impossible to systematicness is carried out to the parallel power wave filter of hanging net operation, accurate
Property, agility filtering performance detection, also can not just realize and monitoring is tracked to parallel power wave filter.
Utility model content
The utility model provides a kind of parallel power wave filter monitoring and protecting device based on multi-channel sampling, can be right
In complicated electric power system network operation parallel power wave filter carry out longer period harmonic filtration performance test, synthesis sentence
The utilization ratio of disconnected parallel power wave filter, and the harmonic wave situation occurred of electric power system, protection parallel power filtering are analyzed in real time
Device equipment.
Monitored and protected there is provided a kind of parallel power wave filter based on multi-channel sampling according to one side of the present utility model
Protection unit, including：Voltage acquisition module, the voltage acquisition module is connected with bus or 220V/380V major loops, for measuring
The bus voltage signal of bus where parallel power wave filter；Current acquisition module, the current acquisition module and total input-wire electricity
Current transformer secondary side is connected, the current signal for measuring total input-wire；Multiple filter branch current acquisition modules, each filtering
Branch current acquisition module is connected with the Current Transformer Secondary side of each filter branch respectively, for measuring each filter branch
Current signal；Wherein, the sampled signal of each acquisition module it is filtered, amplification after deliver at A/D modular converters, DSP data signals
Module is managed, DSP digital signal processing modules include chip and the FFT computing unit, the base that are connected with chip by circuit
This harmonic parameters computing unit, parallel power filter filtering performance computing unit, the voltage changed through A/D, current signal are defeated
FFT computing unit is sent into, the voltage of collection, electric current through Fast Fourier Transform (FFT), are decomposed into straight by FFT computing unit
Flow component, fundametal compoment and higher harmonic components, primary harmonic parameter calculation unit receive the base of FFT computing unit transmission
Ripple and higher harmonic components, and parameters of electric power is calculated, parallel power filter filtering performance computing unit calls primary harmonic
Calculating data in parameter calculation unit, the canonical parameter with reference to built in parallel power filter filtering performance computing unit, than
Relatively show that each harmonic of parallel power wave filter filters out ability, while calculating whether each filter branch produces resonance.
Preferably, DSP digital signal processing modules also include non-volatile memory cells and LCD display module, DSP numbers
Word signal processing module is connected with the non-volatile memory cells, LCD display module respectively by communication interface, the LCD
Display module calls in non-volatile memory cells all data and shows parallel power performance of filter and electric power system at any time
Quality of power supply parameters.
Preferably, DSP digital signal processing modules are also associated with 4 × 4 matrix keyboards, defeated by 4 × 4 matrix keyboards
Enter parallel power wave filter electric power system parameter and each filter branch device parameter, reactor, parallel power wave filter wiring
Mode parameter, FFT computing unit calculates the fundamental current of filter branch according to the parameter of input.
Preferably, DSP digital signal processing modules according to the harmonic component current effective value after total input-wire current transformation, simultaneously
Join the harmonic current virtual value of electric-power filter filter branch, calculate parallel power wave filter harmonic filtration rate, calculate
Parallel power wave filter harmonic filtration rate passes through the setting value inputted with 4 × 4 matrix keyboards and compared, and judges the humorous of each filter branch
Whether ripple rejection rate is less than setting value, and such as certain road filter branch rejection rate is less than setting value, then LCD display module shows that the road is filtered
Ripple branch road is alarmed.
Preferably, parallel power filter filtering performance computing unit judges each filter through being compared with built-in canonical parameter
Whether the harmonic voltage containing rate of ripple branch road exceeds critical field, to determine whether filter branch produces resonance, and is tied calculating
Fruit is sent to LCD display module and shown.
Preferably, the I/O interfaces of DSP digital signal processing modules are connected with tripping relay, tripping relay and filtering
The breaker of branch road/contactor connection, when parallel power filter filtering performance computing unit judges that i filter branch generation is humorous
When shaking, DSP digital signal processing modules send trip signal by I/O interfaces to tripping relay, and tripping relay sends letter
Number breaker/contactor is given, most high order is disconnected successively to i filter branch, while LCD display module shows that resonance is alarmed, its
Middle i is the natural number more than 1.
Brief description of the drawings
By the way that embodiment is described with reference to accompanying drawings below, features described above of the present utility model and technological merit will
Become more fully apparent and be readily appreciated that.
Fig. 1 is the system architecture frame for representing the parallel power wave filter monitoring and protecting device that the utility model embodiment is related to
Figure；
Fig. 2 is to represent the DSP digital signal processing module computing unit theory diagrams that the utility model embodiment is related to.
Embodiment
Supervised below with reference to the accompanying drawings to describe the parallel power wave filter described in the utility model based on multi-channel sampling
Control the embodiment of protection device.One of ordinary skill in the art will recognize, without departing from spirit of the present utility model and
In the case of scope, described embodiment can be modified with a variety of modes or its combination.Therefore, accompanying drawing and
Description is inherently illustrative, is not intended to limit the scope of the claims.In addition, in this manual, it is attached
Figure is drawn not in scale, and identical reference represents identical part.
For filter systematically to the parallel power wave filter, particularly high-voltage parallel electric-power filter of hanging net operation in power network
Ripple performance is monitored on-line, and is accurately and rapidly filtered performance test analysis, protection high-voltage parallel electric-power filter
Safe operation, while obtaining the situation and feature information of the harmonic wave generating capacity of power network, the utility model is adopted the following technical scheme that：
The parallel power wave filter monitoring and protecting device is by voltage acquisition module, current acquisition module, filter branch electric current
Acquisition module, A/D modular converters, DSP digital signal processing modules composition, wherein, the quantity of filter branch current acquisition module
It is consistent with the quantity of filter branch.
As shown in figure 1, voltage acquisition module is connected with the voltage transformer being connected on bus, or and 220V/380V
Major loop is connected, and the busbar voltage of bus is sampled where to being tested parallel power wave filter.Current acquisition module and this section
Total input-wire Current Transformer Secondary side is connected, for measuring this section of total input-wire electric current.Multiple filtering is had in circuit, for each
Filtering is respectively formed a filter branch.The electric current of each filter branch is acquired, using filter branch current acquisition module
The Current Transformer Secondary side with each filter branch is connected respectively, measures the electric current of filter branch, as shown in figure 1, corresponding 2 times
Filter branch, is provided with 1 filter branch current acquisition module, and 3 filtering of correspondence is also equipped with 1 filter branch electric current and adopted
Collect module, i filtering of correspondence is also equipped with 1 filter branch current acquisition module.Filter branch current acquisition module respectively with
The secondary side of the current transformer of each filter branch is connected, to measure parallel power wave filter each filter branch electric current.
All sampled signals filter through each acquisition module, amplify after deliver to A/D modular converters, each signal after being changed through A/D delivers to DSP
Digital signal processing module, to calculate power quality parameter.
DSP digital signal processing modules include TMS320F28335 chips and become with the FFT that there is chip circuit to be connected
Change computing unit, primary harmonic parameter calculation unit, parallel power filter filtering performance computing unit.TMS320F28335 cores
Piece is the master controller of monitoring and protecting device, and the high speed processing ability with 150MHz possesses 32 floating point processing units, is used for
Complete the work such as every internal arithmetic, the communication process of monitoring and protecting device.FFT computing unit, primary harmonic parameter meter
It can be insertable type hardware device to calculate unit, parallel power filter filtering performance computing unit, had respectively with chip interface
There is circuit connection.Also, chip is connected with reset circuit, clock circuit, and there is JTAG emulation interfaces, I/O interfaces, electricity is extended out
Source interface, communication interface.Extend out I/O interfaces and tripping relay, indicator lamp etc. to be connected, for monitoring and protecting device alarm, jump
The protection acts such as lock are exported.
Power module use TPS767D301 chips, be DSP digital signal processing modules etc. provide 3.3V control power supply and
1.9V core power.Communication interface includes RS232, RS485, CAN communication interface, can be connected with outside network device, example
Such as transmit data and control instruction.
Reset circuit is connected with external reset button or reset change-over switch, and to prevent external disturbance, RC reset circuits connect
DSP RST pins are accessed after smit circuit again.When SR or reset change-over switch put reset, DSP RST pins are
High level, dsp chip recovers to original state, restarts configuration processor.FFT computing unit, primary harmonic parameter meter
Calculate unit, parallel power filter filtering performance computing unit and re-execute calculation procedure, tripping relay dead electricity, LCD is shown
Alarm and disappear in module.
Clock circuit uses external crystal crystal oscillator, is connected with the X1 and X2 on DSP, is dsp chip, A/D is changed, communication connects
Mouth etc. provides peripheral clock.
In addition, as shown in figure 1, monitoring and protecting device also has LCD display module, LCD display module is protected as monitoring
A device man-machine interface part, is made up of lcd controller, LCD drive circuits, LCD display device etc., for display monitoring protection
The information such as the parameters and equipment state of device.FFT computing unit, base are provided with DSP digital signal processing modules
This harmonic parameters computing unit, parallel power filter filtering performance computing unit.Always entered using the busbar voltage of measurement, this section
Line current, each filtered circuit calculate primary harmonic parameter, and are compared with parameter specified in international, power industry standard
Compared with so as to judge whether the harmonic filtration ability of wave filter is up to standard.Parallel power filter filtering performance computing unit is also set up
There is comparing unit, for the parameters of electric power respectively calculated and canonical parameter to be compared.For example, parallel power filter filtering
Performance computing unit can connect Embedded comparator, or external multiple gate circuits etc., and gate circuit uses the shape of integrated circuit
Formula.Parallel power filter filtering performance computing unit calls the result of calculation of other computing units further to calculate harmonic wave filter
Except rate, and comparing unit is sent to, harmonic filtration rate is compared, sentenced by comparing unit with the setting value that 4 × 4 matrix keyboards are inputted
Whether the harmonic filtration rate of disconnected each filter branch is less than setting value, and such as certain road filter branch rejection rate is less than setting value, then compared
Unit, which sends signal, makes LCD display module show the road filter branch alarm.
Moreover, parallel power filter filtering performance computing unit calls what is calculated in primary harmonic parameter calculation unit
The harmonic voltage containing rate of each filter branch, comparing unit judges whether harmonic voltage containing rate exceeds critical field, to determine
Whether filter branch produces resonance, and comparative result is sent into LCD display module shown.
Signal into DSP digital signal processing modules is carried out dividing after Fast Fourier Transform (FFT) by FFT computing unit
Solve as DC component, fundamental wave and each higher harmonic components.As shown in Fig. 2 busbar voltage is decomposed into comprising direct current after FFT
Voltage, fundamental wave crest voltage, 2 subharmonic crest voltages, 3 subharmonic crest voltages, one group of number up to i subharmonic crest voltages
According to.This section of total input-wire electric current is decomposed into after FFT comprising DC current, fundamental wave peak point current, 2 subharmonic peak point currents, 3
Subharmonic peak point current, one group of data up to i subharmonic peak point currents.The each filter branch electric current of correspondence, each filtering branch
Road electric current is decomposed into after FFT comprising filter branch DC current, fundamental wave peak point current, 2 filter branch harmonic spikes
Electric current, 3 filter branch harmonic spike electric currents, one group of data up to i filter branch harmonic spike electric current.Electricity after decomposition
Stream and component of voltage send into primary harmonic parameter calculation unit, and every power quality parameter meter is carried out by each computing unit
Calculate.Include in primary harmonic parameter calculation unit harmonic voltage containing rate computing unit, harmonic current containing ratio computing unit,
Harmonic voltage cubage unit, harmonic current cubage unit, voltage total harmonic distortion factor computing unit, current total harmonic
Aberration rate computing unit, parallel power wave filter reactive power calculate unit.Calculating obtains containing comprising ith harmonic voltage
Rate, ith harmonic current containing ratio, harmonic voltage content, harmonic current content, voltage total harmonic distortion factor, current total harmonic
Aberration rate, ith harmonic spike voltage, ith harmonic spike electric current, one group of data of parallel power wave filter reactive power.
The parameters drawn through primary harmonic parameter calculation unit calculate single by parallel power filter filtering performance again
Metacall, calculates harmonic filtration rate, harmonic resonance in parallel power filter filtering performance computing unit.For example, according to total
Harmonic component current effective value, the harmonic current virtual value of parallel power filter filtering branch road after inlet wire current conversion, meter
Calculate parallel power wave filter harmonic filtration rate.2 subharmonic branch roads of correspondence, calculate 2 subharmonic rejection rates, 2 subharmonic resonance.
Correspondence i subharmonic branch roads, then calculate 2 to i subharmonic rejection rate, 2 to i subharmonic resonance.Also, in parallel power wave filter
Every national standard has been have input in filtering performance computing unit, parameter index specified in power industry standard, especially
Every electric current, the limit value of voltage parameter specified in GB14549-93, thus compare draw each time of parallel power wave filter it is humorous
Ripple filters out ability.
Preferably, 4 × 4 matrix keyboards are additionally provided with, inputting parallel power wave filter by 4 × 4 matrix keyboards supplies
Electric system parameter (voltage class, benchmark capacity of short circuit, minimum capacity of short circuit of points of common connection of points of common connection etc.) and
Each filter branch device parameter (the benchmark capacity of short circuit of points of common connection, the minimum capacity of short circuit of points of common connection, capacitance,
Rated voltage, connection in series-parallel number etc.), reactor (inductance value, quality factor, tuned frequency etc.), parallel power wave filter wiring side
The parameters such as formula, and the fundamental current of filter branch is calculated according to the parameter of input, also, judge the harmonic wave electricity of each filter branch
Press whether containing ratio exceeds professional standard scope, to determine whether filter branch produces resonance, and make in LCD display module shape
State is shown.
In addition, as shown in figure 1, the I/O interfaces that extend out of DSP digital signal processing modules are connected with tripping relay, specifically
Ground is said, is each filter branch current acquisition module of correspondence, is connected with a tripping relay.On each filter branch,
Filter branch breaker/contactor is additionally provided with, the break-make of breaker/contactor is controlled by tripping relay.DSP numerals
Signal processing module is monitored in real time, when monitoring and protecting device analysis show that i filter branch generation is humorous in parallel power wave filter
When shaking, trip signal can be sent, most high order is disconnected successively to i filter branch, while LCD display module shows resonance alarm,
Wherein i is the natural number more than 1.
The utility model is collected using voltage acquisition module, current acquisition module, filter branch current acquisition module
Busbar voltage data, this section of total input-wire current data, the current data of each filter branch, and pass through DSP Digital Signal Processing moulds
Block computing obtains filter resonance data, so as to judge whether filter branch produces resonance.Also, as produced resonance phenomena, then lead to
Cross tripping relay and control breaker or contactor separating brake in time, protection parallel power wave filter is without damage.The utility model
The parallel power wave filter monitoring and protecting device based on multi-channel sampling can in complicated electric power system network operation and
Join the harmonic filtration performance test that electric-power filter carries out longer period, utilizing for comprehensive descision parallel power wave filter is imitated
Rate, and the harmonic wave situation occurred of electric power system is analyzed in real time, protect parallel power filter apparatus.Also, simultaneously to total input-wire
Sampled, system side and parallel power wave filter side harmonic wave can be carried out with the current and voltage signals of parallel power wave filter
It is synchronous calculate, analysis, it is to avoid system and parallel power wave filter are tested respectively, because external interference factor and caused by data point
The error of analysis.
In addition, DSP digital signal processing modules are circumscribed with non-volatile memory cells, to preserve in DSP processing operations
Ephemeral data and FFT computing unit, primary harmonic parameter calculation unit, parallel power filter filtering performance calculate
The various data for preserving and showing that unit is calculated, are consulted and data analysis for user.And LCD display module can be with
All data are called in non-volatile memory cells at any time and show parallel power performance of filter and the electric power system quality of power supply
Parameters, while all data in communication interface module reading non-volatile memory cells can be passed through.
Preferred embodiment of the present utility model is the foregoing is only, the utility model is not limited to, for this area
Technical staff for, the utility model can have various modifications and variations.It is all it is of the present utility model spirit and principle within,
Any modification, equivalent substitution and improvements made etc., should be included within protection domain of the present utility model.
Claims (6)
1. a kind of parallel power wave filter monitoring and protecting device based on multi-channel sampling, it is characterised in that including：
Voltage acquisition module, the voltage acquisition module is connected with bus or 220V/380V major loops, for measuring parallel power
The bus voltage signal of bus where wave filter；
Current acquisition module, the current acquisition module is connected with total input-wire Current Transformer Secondary side, always enters for measuring
The current signal of line；
Multiple filter branch current acquisition modules, the Current Mutual Inductance of each filter branch current acquisition module respectively with each filter branch
Device secondary side is connected, the current signal for measuring each filter branch；
Wherein, the sampled signal of each acquisition module it is filtered, amplification after deliver to A/D modular converters,
DSP digital signal processing modules, DSP digital signal processing modules include chip and are connected by circuit with chip
FFT computing unit, primary harmonic parameter calculation unit, parallel power filter filtering performance computing unit,
Voltage, the current signal changed through A/D are conveyed into FFT computing unit,
The voltage of collection, electric current through Fast Fourier Transform (FFT), are decomposed into DC component, fundametal compoment by FFT computing unit
And higher harmonic components,
Primary harmonic parameter calculation unit receives the fundamental wave and higher harmonic components of the transmission of FFT computing unit, and calculates
Parameters of electric power, parallel power filter filtering performance computing unit calls the calculating data in primary harmonic parameter calculation unit,
Canonical parameter with reference to built in parallel power filter filtering performance computing unit, compares draw parallel power wave filter each time
Harmonic filtration ability, while calculating whether each filter branch produces resonance.
2. a kind of parallel power wave filter monitoring and protecting device based on multi-channel sampling as claimed in claim 1, its feature
It is, DSP digital signal processing modules also include non-volatile memory cells and LCD display module,
DSP digital signal processing modules are connected with the non-volatile memory cells, LCD display module respectively by communication interface
Connect,
The LCD display module calls in non-volatile memory cells all data and shows parallel power performance of filter at any time
And electric power system quality of power supply parameters.
3. a kind of parallel power wave filter monitoring and protecting device based on multi-channel sampling as claimed in claim 1, its feature
It is, DSP digital signal processing modules are also associated with 4 × 4 matrix keyboards, parallel power is inputted by 4 × 4 matrix keyboards
Wave filter electric power system parameter and each filter branch device parameter, reactor, parallel power wave filter mode of connection parameter,
FFT computing unit calculates the fundamental current of filter branch according to the parameter of input.
4. a kind of parallel power wave filter monitoring and protecting device based on multi-channel sampling as claimed in claim 3, its feature
It is, DSP digital signal processing modules are filtered according to the harmonic component current effective value after total input-wire current transformation, parallel power
The harmonic current virtual value of device filter branch, calculates parallel power wave filter harmonic filtration rate, the parallel power filter calculated
Ripple device harmonic filtration rate passes through the setting value inputted with 4 × 4 matrix keyboards and compared, and judging the harmonic filtration rate of each filter branch is
No to be less than setting value, such as certain road filter branch rejection rate is less than setting value, then LCD display module shows the road filter branch report
It is alert.
5. a kind of parallel power wave filter monitoring and protecting device based on multi-channel sampling as claimed in claim 1, its feature
It is,
Parallel power filter filtering performance computing unit judges the harmonic wave of each filter branch through being compared with built-in canonical parameter
Whether voltage containing ratio exceeds critical field, to determine whether filter branch produces resonance, and result of calculation is sent into LCD shown
Show that module is shown.
6. a kind of parallel power wave filter monitoring and protecting device based on multi-channel sampling as claimed in claim 1, its feature
It is, the I/O interfaces of DSP digital signal processing modules are connected with tripping relay, the open circuit of tripping relay and filter branch
Device/contactor connection, when parallel power filter filtering performance computing unit judges that i filter branch produces resonance, DSP numbers
Word signal processing module sends trip signal by I/O interfaces to tripping relay, tripping relay send a signal to breaker/
Contactor, disconnects most high order to i filter branch successively, while LCD display module shows resonance alarm,
Wherein i is the natural number more than 1.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107478911A (en) * | 2017-09-05 | 2017-12-15 | 国网河南省电力公司检修公司 | A kind of method and system based on harmonic measure high-voltage capacitor capacitance |
| CN108233379A (en) * | 2018-03-14 | 2018-06-29 | 南方电网科学研究院有限责任公司 | Test method, device, equipment and the storage medium of safety and stability control device |
| CN108490248A (en) * | 2018-03-13 | 2018-09-04 | 浙江海洋大学 | A kind of voltage monitoring and voltage protection |
| CN110850203A (en) * | 2019-11-04 | 2020-02-28 | 铜陵有色金属集团股份有限公司 | Systematic harmonic comparison detection method |
| CN111426876A (en) * | 2020-03-31 | 2020-07-17 | 深圳供电局有限公司 | Harmonic monitoring device and harmonic monitoring system based on intelligent switch |
| CN113659844A (en) * | 2021-08-10 | 2021-11-16 | 珠海格力电器股份有限公司 | Harmonic control device and method of frequency converter and frequency converter |
| CN117330834A (en) * | 2023-10-09 | 2024-01-02 | 国网山东省电力公司东营市东营区供电公司 | Dual-sampling-based power grid harmonic content testing method and system |
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2017
- 2017-01-16 CN CN201720048741.6U patent/CN206401896U/en active Active
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107478911A (en) * | 2017-09-05 | 2017-12-15 | 国网河南省电力公司检修公司 | A kind of method and system based on harmonic measure high-voltage capacitor capacitance |
| CN108490248A (en) * | 2018-03-13 | 2018-09-04 | 浙江海洋大学 | A kind of voltage monitoring and voltage protection |
| CN108490248B (en) * | 2018-03-13 | 2023-04-07 | 浙江海洋大学 | Voltage monitoring and protecting device |
| CN108233379A (en) * | 2018-03-14 | 2018-06-29 | 南方电网科学研究院有限责任公司 | Test method, device, equipment and the storage medium of safety and stability control device |
| CN110850203A (en) * | 2019-11-04 | 2020-02-28 | 铜陵有色金属集团股份有限公司 | Systematic harmonic comparison detection method |
| CN110850203B (en) * | 2019-11-04 | 2021-09-24 | 铜陵有色金属集团股份有限公司 | Systematic harmonic comparison detection method |
| CN111426876A (en) * | 2020-03-31 | 2020-07-17 | 深圳供电局有限公司 | Harmonic monitoring device and harmonic monitoring system based on intelligent switch |
| CN113659844A (en) * | 2021-08-10 | 2021-11-16 | 珠海格力电器股份有限公司 | Harmonic control device and method of frequency converter and frequency converter |
| CN117330834A (en) * | 2023-10-09 | 2024-01-02 | 国网山东省电力公司东营市东营区供电公司 | Dual-sampling-based power grid harmonic content testing method and system |
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