CN103837777B - Electric power system electricity quality evaluation method and system - Google Patents
Electric power system electricity quality evaluation method and system Download PDFInfo
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- CN103837777B CN103837777B CN201410100906.0A CN201410100906A CN103837777B CN 103837777 B CN103837777 B CN 103837777B CN 201410100906 A CN201410100906 A CN 201410100906A CN 103837777 B CN103837777 B CN 103837777B
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Abstract
The present invention relates to a kind of electric power system electricity quality evaluation method and system, comprise the steps: to receive the power quality index intending assessment and the limits value information thereof of user's input；Receiving the assessment period information of the described power quality index of user's input, the described assessment period includes some calculation intervals；Gather the corresponding electrical energy parameter of each calculation interval according to default power quality index computational methods, and calculate the power quality index of each calculation interval accordingly；The power quality index of calculated each calculation interval is compared with its limits value, determines that the power quality index of each calculation interval is the most qualified；The qualification rate of described power quality index in the Qualification statistics described assessment period according to each calculation interval power quality index.The technical scheme using the present invention to provide can make external equipment for monitoring power quality meet China's electricity quality evaluation standard, makes external equipment for monitoring power quality also apply be applicable to the electricity quality evaluation monitoring of China.
Description
Technical field
The present invention relates to Power quality management technical field, particularly relate to a kind of electric power system electricity quality evaluation
Method and system.
Background technology
In recent years, along with extensively application and the development of Power Electronic Technique, electric power system add substantial amounts of
Nonlinear load, can cause power network current, voltage waveform to be distorted, and causes the harmonic wave of electrical network " to pollute ".
Such as heavy (merchant) mill, electric locomotive etc., operation not only can produce substantial amounts of higher hamonic wave, and make electricity
Pressure fluctuation, flickering, three-phase imbalance are on the rise.These adverse effect of electrical network is not only resulted in for
The safety of electricity equipment itself reduces, and the economical operation of meeting severe jamming electrical network, cause the " public of electrical network
Evil ".On the other hand, increasing new technology, new technical equipment are more and more severe to the requirement of power supply quality
Carve, the place such as the most industrial flow-lines, sophisticated manufacturing, computer network and service monitoring center each
The equipment of kind etc..The raising that power supply quality is required by user, makes power quality problem become increasingly conspicuous, it is necessary to build
Vertical electric energy quality monitoring system, is monitored whole distrbution network power quality data, analyzes, take to arrange
Impose the raising distrbution network quality of power supply.
American-European countries's electric energy quality monitoring management is more Zao than China's starting, Monitoring and Controlling quality of power supply technology developing water
Flat more advanced than China, but the electric energy quality detection device of foreign brand name is usually according to EU criteria
The design of EN50610 or IEC61000 series standard produces, and partial properties index does not also meet the electric energy of China
Quality standard.In order to judge whether random bigger index meets limit value, the GB of 2008 editions gives 95%
The concept of probit, it is mainly used in voltage three-phase imbalance, harmonic wave, m-Acetyl chlorophosphonazo.95% probit be for
A period of time, in such as requiring the time of one day, there is the time of 95% to meet requirement, then it is assumed that qualified.
European Union and IEC standard the most do not comprise 95% probit, but this value is a measurement electricity in China's standard
The significant data of energy quality.And after the calculation interval of traditional electric energy quality detection device statistical data is arranged,
Cannot revise.And be likely to be during actual production uses and wish by obtaining different calculation interval
Data are analyzed by data, are estimated.That is necessary for readjusting equipment calculation interval, weight
Newly obtain initial data.Both lost time like that, the comparability the strongest data of same period (data be not).
External equipment for monitoring power quality is made to meet domestic demand, it is necessary to use a kind of electric power system electric energy matter
Amount appraisal procedure, to meet China's electricity quality evaluation standard.
Summary of the invention
The technical problem to be solved is: provides a kind of electric power system electricity quality evaluation method and is
System, makes external equipment for monitoring power quality disclosure satisfy that domestic demand.The present invention is achieved in that
A kind of electric power system electricity quality evaluation method, comprises the steps:
Receive the power quality index intending assessment and the limits value information thereof of user's input；
Receive the assessment period information of the described power quality index of user's input, if the described assessment period includes
Dry calculation interval；
According to the corresponding electrical energy parameter of the default power quality index computational methods each calculation interval of collection, and according to
This calculates the power quality index of each calculation interval；
The power quality index of calculated each calculation interval is compared with its limits value, determines each meter
The power quality index calculating the period is the most qualified；
Described electric energy matter in the Qualification statistics described assessment period according to each calculation interval power quality index
The qualification rate of figureofmerit.
Further, described power quality index includes the most any one or more:
Voltage deviation, voltage fluctuation rate, total harmonic distortion；
Wherein, the computational methods of described voltage deviation comprise the steps:
Gather described electric power system according to default voltage deviation computing formula and the first default collection period to exist
Intend calculating the relevant voltage parameter of the calculation interval of voltage deviation, and according to described voltage deviation computing formula meter
Calculate the described electric power system voltage deviation at this calculation interval；The described calculation interval bag intending calculating voltage deviation
Include some described first collection period；
For 35KV and above electric power system:
When Umax and Umin is both greater than Un, voltage deviation=[(Umax-Un)/Un] × 100%；
When Umax and Umin is both less than Un, voltage deviation=[(Umin-Un)/Un] × 100%；
During other situations, voltage deviation=[(Umax-Umin)/Un] × 100%；
For 20KV and following three-phase power supply system, voltage deviation includes the voltage upper deviation and voltage lower deviation:
The voltage upper deviation=[(Umax-Un)/Un] × 100%；
Voltage lower deviation=[(Umin-Un)/Un] × 100%；
For the unidirectional electric power system of 220V, voltage deviation also includes the voltage upper deviation and voltage lower deviation:
The voltage upper deviation=[(Umax-Un)/Un] × 100%；
Voltage lower deviation=[(Umin-Un)/Un] × 100%；
The computational methods of described voltage fluctuation rate comprise the steps:
Described electric power system is gathered according to default voltage fluctuation rate computing formula and the second default collection period
Intending calculating the relevant voltage parameter of the calculation interval of voltage fluctuation rate；The described meter intending calculating voltage fluctuation rate
The calculation period includes some described second collection period；The computing formula of described voltage fluctuation rate is: voltage pulsation
Rate=[(Umax-Umin)/Un] × 100%；
Judge that described electric power system at described Umax and Umin intending calculating the calculation interval of voltage fluctuation rate is
No both greater than zero and Umax, more than Umin, if it is calculates institute according to described voltage fluctuation rate computing formula
State the electric power system voltage fluctuation rate at this calculation interval, do not calculate；
The computational methods of described total harmonic distortion maximum comprise the steps:
Described confession is gathered according to default total harmonic distortion computing formula and the 3rd default collection period
Electricity system is intending calculating the relevant voltage parameter of the calculation interval of total harmonic distortion, and according to described electricity
Pressure total harmonic distortion computing formula calculates described electric power system each voltage parameter in this calculation interval
The total harmonic distortion of acquisition time；The described calculation interval bag intending calculating total harmonic distortion
Include some described 3rd collection period；Described total harmonic distortion computing formula is: voltage harmonic is the most abnormal
Variability=(root-mean-square valve of each harmonic voltage/fundamental voltage virtual value) × 100%；
In above-mentioned all formula, each meaning of parameters is:
Umax: maximum detection voltage；Umin: minimum detection voltage；The rated voltage of Un: electric power system.
Further, described electric power system electricity quality evaluation method also comprises the steps:
Take the voltage harmonic resultant distortion of each voltage parameter acquisition time in calculated described calculation interval
Maximum in rate, as described electric power system at the total harmonic distortion maximum of this calculation interval；
The total harmonic distortion maximum of each calculation interval is arranged in order according to magnitude relationship, casts out
The value of big 5%, takes value maximum in the value of residue 95% as the total harmonic distortion 95% big value of probability；
The described total harmonic distortion 95% big value of probability is compared with its limits value, and according to comparing
Result judges that it is the most qualified.
A kind of electric power system electricity quality evaluation system, including:
Power quality index setting module, for receive user input intend assessment power quality index and
Limits value information；
Assessment slot setup module, for receiving the assessment period letter of the described power quality index of user's input
Ceasing, the described assessment period includes some calculation intervals；
Power quality index computing module, by gathering based on each according to the power quality index computational methods preset
Calculate the corresponding electrical energy parameter of period, and calculate the power quality index of each calculation interval accordingly；
Power quality index evaluation module, for by the power quality index of calculated each calculation interval with
Its limits value compares, and determines that the power quality index of each calculation interval is the most qualified；
Power quality index statistical module, unites for the Qualification according to each calculation interval power quality index
Count the qualification rate of described power quality index in the described assessment period.
Further, described power quality index includes the most any one or more:
Voltage deviation, voltage fluctuation rate, total harmonic distortion；
Described power quality index computing module includes the most any one or more:
Voltage deviation computing module, voltage fluctuation rate computing module, total harmonic distortion computing module；
Described voltage deviation computing module is for adopting according to the voltage deviation computing formula and default first preset
The collection cycle gathers described electric power system and is intending calculating the relevant voltage parameter of the calculation interval of voltage deviation, and root
The described electric power system voltage deviation at this calculation interval is calculated according to described voltage deviation computing formula；Described plan
The calculation interval calculating voltage deviation includes some described first collection period；
For 35KV and above electric power system:
When Umax and Umin is both greater than Un, voltage deviation=[(Umax-Un)/Un] × 100%；
When Umax and Umin is both less than Un, voltage deviation=[(Umin-Un)/Un] × 100%；
During other situations, voltage deviation=[(Umax-Umin)/Un] × 100%；
For 20KV and following three-phase power supply system, voltage deviation includes the voltage upper deviation and voltage lower deviation:
The voltage upper deviation=[(Umax-Un)/Un] × 100%；
Voltage lower deviation=[(Umin-Un)/Un] × 100%；
For the unidirectional electric power system of 220V, voltage deviation also includes the voltage upper deviation and voltage lower deviation:
The voltage upper deviation=[(Umax-Un)/Un] × 100%；
Voltage lower deviation=[(Umin-Un)/Un] × 100%；
Described voltage fluctuation rate computing module is for according to the voltage fluctuation rate computing formula preset and default the
Two collection period gather described electric power system and are intending calculating the relevant voltage parameter of the calculation interval of voltage fluctuation rate,
Judge that described electric power system calculates Umax and Umin of the calculation interval of voltage fluctuation rate the most all described plan
More than zero and Umax is more than Umin, if it is calculate described confession according to described voltage fluctuation rate computing formula
Electricity system, at the voltage fluctuation rate of this calculation interval, does not calculates；The described meter intending calculating voltage fluctuation rate
The calculation period includes some described second collection period；The computing formula of described voltage fluctuation rate is: voltage pulsation
Rate=[(Umax-Umin)/Un] × 100%；
Described total harmonic distortion computing module is for calculating public affairs according to the total harmonic distortion preset
Formula and the 3rd default collection period gather described electric power system in the calculating intending calculating total harmonic distortion
The relevant voltage parameter of period, and calculate described power supply system according to described total harmonic distortion computing formula
The total harmonic distortion of the system each voltage parameter acquisition time in this calculation interval；Described plan
The calculation interval calculating total harmonic distortion includes some described 3rd collection period；Described voltage harmonic
Resultant distortion rate computing formula is: the total harmonic distortion=(root-mean-square valve of each harmonic voltage/first-harmonic electricity
It is pressed with valid value) × 100%；
In above-mentioned all computing formula, each meaning of parameters is:
Umax: maximum detection voltage；Umin: minimum detection voltage；The rated voltage of Un: electric power system.
Further, described power quality index evaluation module also includes total harmonic distortion 95% probability
It is worth greatly evaluation module；Described total harmonic distortion 95% probability big value evaluation module is used for taking and is calculated
Described calculation interval in each voltage parameter acquisition time total harmonic distortion in maximum,
As described electric power system at the total harmonic distortion maximum of this calculation interval, by each calculation interval
Total harmonic distortion maximum is arranged in order according to magnitude relationship, casts out the value of maximum 5%, takes residue
Value maximum in the value of 95% is as the total harmonic distortion 95% big value of probability, by the most abnormal for described voltage harmonic
The big value of variability 95% probability compares with its limits value, and judges that it is the most qualified according to comparative result.
Compared with prior art, the electric power system electricity quality evaluation method and system using the present invention to provide can
Make external equipment for monitoring power quality meet China's electricity quality evaluation standard, make the external quality of power supply supervise
Survey device and also apply be applicable to the electricity quality evaluation monitoring of China.
Accompanying drawing explanation
The electric power system electricity quality evaluation method overall procedure schematic diagram that Fig. 1: the embodiment of the present invention provides;
Fig. 2: voltage deviation computational methods flow process signal in above-mentioned electric power system electricity quality evaluation method flow
Figure；
Fig. 3: in above-mentioned electric power system electricity quality evaluation method flow, voltage fluctuation rate computational methods flow process is shown
It is intended to；
Fig. 4: in above-mentioned electric power system electricity quality evaluation method flow, total harmonic distortion 95% probability is big
Value calculating method schematic flow sheet；
The electric power system electricity quality evaluation system composition schematic diagram that Fig. 5: the embodiment of the present invention provides.
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage clearer, below in conjunction with accompanying drawing and reality
Execute example, the present invention is further elaborated.Only should be appreciated that specific embodiment described herein
For explaining the present invention, it is not intended to limit the present invention.
The electric power system electricity quality evaluation method overall procedure schematic diagram that Fig. 1 provides for the embodiment of the present invention,
According to Fig. 1, the basic procedure of electric power system electricity quality evaluation method is as follows:
The selected power quality index intending assessment, and its limits value is set.Power quality index includes many-side,
According to concerned countries standard, including voltage deviation, voltage fluctuation rate, total harmonic distortion etc..For
A selected power quality index, assessment was all carried out, accordingly, it would be desirable to set within certain assessment period
Commenting on and estimate the period, meanwhile, the set assessment period is further divided into multiple calculation interval, in each calculating
Period all can calculate a power quality index.Each the power quality index intending assessment is all preset with
Its computational methods, include the computing formula of this power quality index in computational methods, in computing formula clearly
To calculate the parameter that this power quality index needs to obtain.Therefore, according to default power quality index meter
Calculation method can gather the corresponding electrical energy parameter of each calculation interval, then according to the computing formula meter in computational methods
Calculate the power quality index drawing each calculation interval.After the power quality index calculating each calculation interval,
It is compared with its limits value, thus judges that this power quality index of each calculation interval is the most qualified,
Then it is somebody's turn to do according in the assessment period set by the Qualification statistics of this power quality index of each calculation interval
The qualification rate of power quality index.
The computational methods of voltage deviation comprise the steps:
Electric pressure according to electric power system sets corresponding voltage deviation computing formula；
Gather described electric power system according to described voltage deviation computing formula and the first default collection period intending
Calculate the relevant voltage parameter of the calculation interval of voltage deviation, and calculate according to described voltage deviation computing formula
Described electric power system is at the voltage deviation of this calculation interval；The described calculation interval intending calculating voltage deviation includes
Some described first collection period；
According to Fig. 2, for 35KV and above electric power system:
When Umax and Umin is both greater than Un, voltage deviation=[(Umax-Un)/Un] × 100%；
When Umax and Umin is both less than Un, voltage deviation=[(Umin-Un)/Un] × 100%；
During other situations, voltage deviation=[(Umax-Umin)/Un] × 100%；
For 20KV and following three-phase power supply system, voltage deviation includes the voltage upper deviation and voltage lower deviation:
The voltage upper deviation=[(Umax-Un)/Un] × 100%；
Voltage lower deviation=[(Umin-Un)/Un] × 100%；
For the unidirectional electric power system of 220V, voltage deviation also includes the voltage upper deviation and voltage lower deviation:
The voltage upper deviation=[(Umax-Un)/Un] × 100%；
Voltage lower deviation=[(Umin-Un)/Un] × 100%.
The computational methods of voltage fluctuation rate comprise the steps:
Setting voltage stability bandwidth computing formula: voltage fluctuation rate=[(Umax-Umin)/Un] × 100%；
Gather described electric power system according to described voltage fluctuation rate computing formula and the second default collection period to exist
Intend calculating the relevant voltage parameter of the calculation interval of voltage fluctuation rate；The described calculating intending calculating voltage fluctuation rate
Period includes some described second collection period；
According to Fig. 3, it is judged that described electric power system is at the described calculation interval intending calculating voltage fluctuation rate
Umax and Umin the most both greater than zero and Umax is more than Umin, if it is according to described voltage fluctuation rate meter
The calculation formula described electric power system of calculating, at the voltage fluctuation rate of this calculation interval, does not the most calculate this calculation interval
Voltage fluctuation rate, and continue gather subsequent period Umax and Umin, judge according to preceding method and count
Calculate stability bandwidth, so each calculation interval is carried out identical judgement and calculating.
The computational methods of total harmonic distortion maximum comprise the steps:
Setting voltage total harmonic distortion computing formula: total harmonic distortion=(side of each harmonic voltage
All root/fundamental voltage virtual values) × 100%；
Described power supply is gathered according to described total harmonic distortion computing formula and the 3rd default collection period
System is intending calculating the relevant voltage parameter of the calculation interval of total harmonic distortion, and according to described voltage
Total harmonic distortion computing formula calculates described electric power system each voltage parameter in this calculation interval and adopts
The total harmonic distortion of collection time point, and take the maximum in calculated each total harmonic distortion
It is worth as described electric power system at the total harmonic distortion maximum of this calculation interval；Described plan calculates electricity
The calculation interval of pressure total harmonic distortion includes some described 3rd collection period.
In above-mentioned all formula, each meaning of parameters is:
Umax: maximum detection voltage；Umin: minimum detection voltage；The rated voltage of Un: electric power system.
Above-mentioned assessment period, calculation interval, each collection period can be according to requirements such as electricity quality evaluation precision
Different values is set, such as, collection period, calculation interval and assessment period are respectively set to 3 seconds, 5
Minute and 24 hours etc..
Unlike the appraisal procedure of voltage deviation and voltage pulsation, electric power system voltage harmonic is commented
Estimating, China's national standard is to use to judge that whether the total harmonic distortion 95% big value of probability is beyond limits value
Judge that electric power system voltage harmonic is the most qualified.The definition of the 95% big value of probability is by national standard, 95%
The big value of probability refers to: be arranged in order descending for measured value, gives up the big value of above 5%, remains measured value
Big value.Therefore, after detecting the total harmonic distortion maximum of each calculation interval, in addition it is also necessary to will
The total harmonic distortion maximum of each calculation interval is arranged in order according to size order, and casts out maximum
The value of 5%, takes value maximum in the value of residue 95% as the total harmonic distortion 95% big value of probability (such as figure
Shown in 4).Then the total harmonic distortion 95% big value of probability is compared with its limits value, thus sentence
The voltage harmonic of this electric power system within the assessment period that breaks is the most qualified.
According to above-mentioned electric power system electricity quality evaluation method, the embodiment of the present invention additionally provides a kind of power supply system
System electricity quality evaluation system.According to Fig. 5, this system includes:
Power quality index setting module 1, for receive user input intend assessment power quality index and
Its limits value information；
Assessment slot setup module 2, for receiving the assessment period of the described power quality index of user's input
Information, the described assessment period includes some calculation intervals；
Power quality index computing module 3, each for gathering according to the power quality index computational methods preset
The corresponding electrical energy parameter of calculation interval, and calculate the power quality index of each calculation interval accordingly；
Power quality index evaluation module 4, for by the power quality index of calculated each calculation interval
Compare with its limits value, determine that the power quality index of each calculation interval is the most qualified；
Power quality index statistical module 5, for the Qualification according to each calculation interval power quality index
The qualification rate of described power quality index in adding up the described assessment period.
Power quality index includes the most any one or more:
Voltage deviation, voltage fluctuation rate, total harmonic distortion；
Power quality index computing module 3 includes the most any one or more:
Voltage deviation computing module 301, voltage fluctuation rate computing module 302, total harmonic distortion calculate
Module 303；
Voltage deviation computing module 301 is for adopting according to the voltage deviation computing formula and default first preset
The collection cycle gathers described electric power system and is intending calculating the relevant voltage parameter of the calculation interval of voltage deviation, and root
The described electric power system voltage deviation at this calculation interval is calculated according to described voltage deviation computing formula；Described plan
The calculation interval calculating voltage deviation includes some described first collection period；
For 35KV and above electric power system:
When Umax and Umin is both greater than Un, voltage deviation=[(Umax-Un)/Un] × 100%；
When Umax and Umin is both less than Un, voltage deviation=[(Umin-Un)/Un] × 100%；
During other situations, voltage deviation=[(Umax-Umin)/Un] × 100%；
For 20KV and following three-phase power supply system, voltage deviation includes the voltage upper deviation and voltage lower deviation:
The voltage upper deviation=[(Umax-Un)/Un] × 100%；
Voltage lower deviation=[(Umin-Un)/Un] × 100%；
For the unidirectional electric power system of 220V, voltage deviation also includes the voltage upper deviation and voltage lower deviation:
The voltage upper deviation=[(Umax-Un)/Un] × 100%；
Voltage lower deviation=[(Umin-Un)/Un] × 100%；
Voltage fluctuation rate computing module 302 is for according to the voltage fluctuation rate computing formula preset and default the
Two collection period gather described electric power system and are intending calculating the relevant voltage parameter of the calculation interval of voltage fluctuation rate,
Judge that described electric power system calculates Umax and Umin of the calculation interval of voltage fluctuation rate the most all described plan
More than zero and Umax is more than Umin, if it is calculate described confession according to described voltage fluctuation rate computing formula
Electricity system, at the voltage fluctuation rate of this calculation interval, does not calculates；The described meter intending calculating voltage fluctuation rate
The calculation period includes some described second collection period；The computing formula of described voltage fluctuation rate is: voltage pulsation
Rate=[(Umax-Umin)/Un] × 100%；
Total harmonic distortion computing module 303 is for calculating public affairs according to the total harmonic distortion preset
Formula and the 3rd default collection period gather described electric power system in the calculating intending calculating total harmonic distortion
The relevant voltage parameter of period, and calculate described power supply system according to described total harmonic distortion computing formula
The total harmonic distortion of the system each voltage parameter acquisition time in this calculation interval；Described plan
The calculation interval calculating total harmonic distortion includes some described 3rd collection period；Described voltage harmonic
Resultant distortion rate computing formula is: the total harmonic distortion=(root-mean-square valve of each harmonic voltage/first-harmonic electricity
It is pressed with valid value) × 100%；
In above-mentioned all computing formula, each meaning of parameters is:
Umax: maximum detection voltage；Umin: minimum detection voltage；The rated voltage of Un: electric power system.
Power quality index evaluation module 4 also includes total harmonic distortion 95% probability big value evaluation module
401；Total harmonic distortion 95% probability big value evaluation module 401 is used for taking calculated described calculating
Maximum in the total harmonic distortion of each voltage parameter acquisition time in the period, as described confession
Electricity system is at the total harmonic distortion maximum of this calculation interval, by total for the voltage harmonic of each calculation interval
Aberration rate maximum is arranged in order according to magnitude relationship, casts out the value of maximum 5%, takes in the value of residue 95%
Maximum value is as the total harmonic distortion 95% big value of probability, by described total harmonic distortion 95%
The big value of probability compares with its limits value, and judges that it is the most qualified according to comparative result.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all at this
Any amendment, equivalent and the improvement etc. made within bright spirit and principle, should be included in the present invention
Protection domain within.
Claims (4)
1. an electric power system electricity quality evaluation method, it is characterised in that comprise the steps:
Receive the power quality index intending assessment and the limits value information thereof of user's input；
Receive the assessment period information of the described power quality index of user's input, if the described assessment period includes
Dry calculation interval；
According to the corresponding electrical energy parameter of the default power quality index computational methods each calculation interval of collection, and according to
This calculates the power quality index of each calculation interval；
The power quality index of calculated each calculation interval is compared with its limits value, determines each meter
The power quality index calculating the period is the most qualified；
Described electric energy matter in the Qualification statistics described assessment period according to each calculation interval power quality index
The qualification rate of figureofmerit；
Described power quality index includes the most any one or more:
Voltage deviation, voltage fluctuation rate, total harmonic distortion；
Wherein, the computational methods of described voltage deviation comprise the steps:
Gather described electric power system according to default voltage deviation computing formula and the first default collection period to exist
Intend calculating the relevant voltage parameter of the calculation interval of voltage deviation, and according to described voltage deviation computing formula meter
Calculate the described electric power system voltage deviation at this calculation interval；The described calculation interval bag intending calculating voltage deviation
Include some described first collection period；
For 35KV and above electric power system:
When Umax and Umin is both greater than Un, voltage deviation=[(Umax-Un)/Un] × 100%；
When Umax and Umin is both less than Un, voltage deviation=[(Umin-Un)/Un] × 100%；
During other situations, voltage deviation=[(Umax-Umin)/Un] × 100%；
For 20KV and following three-phase power supply system, voltage deviation includes the voltage upper deviation and voltage lower deviation:
The voltage upper deviation=[(Umax-Un)/Un] × 100%；
Voltage lower deviation=[(Umin-Un)/Un] × 100%；
For the unidirectional electric power system of 220V, voltage deviation also includes the voltage upper deviation and voltage lower deviation:
The voltage upper deviation=[(Umax-Un)/Un] × 100%；
Voltage lower deviation=[(Umin-Un)/Un] × 100%；
The computational methods of described voltage fluctuation rate comprise the steps:
Described electric power system is gathered according to default voltage fluctuation rate computing formula and the second default collection period
Intending calculating the relevant voltage parameter of the calculation interval of voltage fluctuation rate；The described meter intending calculating voltage fluctuation rate
The calculation period includes some described second collection period；The computing formula of described voltage fluctuation rate is: voltage pulsation
Rate=[(Umax-Umin)/Un] × 100%；
Judge that described electric power system at described Umax and Umin intending calculating the calculation interval of voltage fluctuation rate is
No both greater than zero and Umax, more than Umin, if it is calculates institute according to described voltage fluctuation rate computing formula
State the electric power system voltage fluctuation rate at this calculation interval, do not calculate；
The computational methods of described total harmonic distortion maximum comprise the steps:
Described confession is gathered according to default total harmonic distortion computing formula and the 3rd default collection period
Electricity system is intending calculating the relevant voltage parameter of the calculation interval of total harmonic distortion, and according to described electricity
Pressure total harmonic distortion computing formula calculates described electric power system each voltage parameter in this calculation interval
The total harmonic distortion of acquisition time；The described calculation interval bag intending calculating total harmonic distortion
Include some described 3rd collection period；Described total harmonic distortion computing formula is: voltage harmonic is the most abnormal
Variability=(root-mean-square valve of each harmonic voltage/fundamental voltage virtual value) × 100%；
In above-mentioned all formula, each meaning of parameters is:
Umax: maximum detection voltage；Umin: minimum detection voltage；The rated voltage of Un: electric power system.
2. electric power system electricity quality evaluation method as claimed in claim 1, it is characterised in that also include
Following steps:
Take the voltage harmonic resultant distortion of each voltage parameter acquisition time in calculated described calculation interval
Maximum in rate, as described electric power system at the total harmonic distortion maximum of this calculation interval；
The total harmonic distortion maximum of each calculation interval is arranged in order according to magnitude relationship, casts out
The value of big 5%, takes value maximum in the value of residue 95% as the total harmonic distortion 95% big value of probability；
The described total harmonic distortion 95% big value of probability is compared with its limits value, and according to comparing
Result judges that it is the most qualified.
3. an electric power system electricity quality evaluation system, it is characterised in that including:
Power quality index setting module, for receive user input intend assessment power quality index and
Limits value information；
Assessment slot setup module, for receiving the assessment period letter of the described power quality index of user's input
Ceasing, the described assessment period includes some calculation intervals；
Power quality index computing module, by gathering based on each according to the power quality index computational methods preset
Calculate the corresponding electrical energy parameter of period, and calculate the power quality index of each calculation interval accordingly；
Power quality index evaluation module, for by the power quality index of calculated each calculation interval with
Its limits value compares, and determines that the power quality index of each calculation interval is the most qualified；
Power quality index statistical module, unites for the Qualification according to each calculation interval power quality index
Count the qualification rate of described power quality index in the described assessment period；
Described power quality index includes the most any one or more:
Voltage deviation, voltage fluctuation rate, total harmonic distortion；
Described power quality index computing module includes the most any one or more:
Voltage deviation computing module, voltage fluctuation rate computing module, total harmonic distortion computing module；
Described voltage deviation computing module is for adopting according to the voltage deviation computing formula and default first preset
The collection cycle gathers described electric power system and is intending calculating the relevant voltage parameter of the calculation interval of voltage deviation, and root
The described electric power system voltage deviation at this calculation interval is calculated according to described voltage deviation computing formula；Described plan
The calculation interval calculating voltage deviation includes some described first collection period；
For 35KV and above electric power system:
When Umax and Umin is both greater than Un, voltage deviation=[(Umax-Un)/Un] × 100%；
When Umax and Umin is both less than Un, voltage deviation=[(Umin-Un)/Un] × 100%；
During other situations, voltage deviation=[(Umax-Umin)/Un] × 100%；
For 20KV and following three-phase power supply system, voltage deviation includes the voltage upper deviation and voltage lower deviation:
The voltage upper deviation=[(Umax-Un)/Un] × 100%；
Voltage lower deviation=[(Umin-Un)/Un] × 100%；
For the unidirectional electric power system of 220V, voltage deviation also includes the voltage upper deviation and voltage lower deviation:
The voltage upper deviation=[(Umax-Un)/Un] × 100%；
Voltage lower deviation=[(Umin-Un)/Un] × 100%；
Described voltage fluctuation rate computing module is for according to the voltage fluctuation rate computing formula preset and default the
Two collection period gather described electric power system and are intending calculating the relevant voltage parameter of the calculation interval of voltage fluctuation rate,
Judge that described electric power system calculates Umax and Umin of the calculation interval of voltage fluctuation rate the most all described plan
More than zero and Umax is more than Umin, if it is calculate described confession according to described voltage fluctuation rate computing formula
Electricity system, at the voltage fluctuation rate of this calculation interval, does not calculates；The described meter intending calculating voltage fluctuation rate
The calculation period includes some described second collection period；The computing formula of described voltage fluctuation rate is: voltage pulsation
Rate=[(Umax-Umin)/Un] × 100%；
Described total harmonic distortion computing module is for calculating public affairs according to the total harmonic distortion preset
Formula and the 3rd default collection period gather described electric power system in the calculating intending calculating total harmonic distortion
The relevant voltage parameter of period, and calculate described power supply system according to described total harmonic distortion computing formula
The total harmonic distortion of the system each voltage parameter acquisition time in this calculation interval；Described plan
The calculation interval calculating total harmonic distortion includes some described 3rd collection period；Described voltage harmonic
Resultant distortion rate computing formula is: the total harmonic distortion=(root-mean-square valve of each harmonic voltage/first-harmonic electricity
It is pressed with valid value) × 100%；
In above-mentioned all computing formula, each meaning of parameters is:
Umax: maximum detection voltage；Umin: minimum detection voltage；The rated voltage of Un: electric power system.
4. electric power system electricity quality evaluation system as claimed in claim 3, it is characterised in that described electricity
Can also include total harmonic distortion 95% probability big value evaluation module by quality index evaluation module；Described electricity
Pressure total harmonic distortion 95% probability big value evaluation module is each for take in calculated described calculation interval
Maximum in the total harmonic distortion of voltage parameter acquisition time, as described electric power system at this
The total harmonic distortion maximum of calculation interval, the total harmonic distortion of each calculation interval is maximum
Value is arranged in order according to magnitude relationship, casts out the value of maximum 5%, takes value maximum in the value of residue 95% and makees
For the total harmonic distortion 95% big value of probability, by the described total harmonic distortion 95% big value of probability and its
Limits value compares, and judges that it is the most qualified according to comparative result.
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| CN105160445A (en) * | 2015-01-19 | 2015-12-16 | 国家电网公司 | Evaluation system and method for power supply reliability for important user |
| CN106019024B (en) * | 2016-07-08 | 2018-10-19 | 西南交通大学 | A kind of tractive power supply system failure risk method for early warning based on electricity quality evaluation |
| CN107765206B (en) * | 2017-10-12 | 2021-01-05 | 广西电网有限责任公司电力科学研究院 | Method for evaluating running state of power quality monitoring device |
| CN110554354B (en) * | 2019-08-30 | 2022-05-13 | 国家电网有限公司 | Equipment maintenance quality monitoring method and system and terminal equipment |
| CN110907716B (en) * | 2019-10-14 | 2022-02-08 | 深圳供电局有限公司 | Method and device for judging voltage deviation isolation effect, power supply system, computer equipment and storage medium |
| CN112330142A (en) * | 2020-11-03 | 2021-02-05 | 浙江华电器材检测研究所有限公司 | Multi-access electric automobile charging pile electric energy quality operation and maintenance management platform |
| CN113433408A (en) * | 2021-06-24 | 2021-09-24 | 江苏华旭电力设计有限公司 | Method for evaluating steady-state power quality |
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