CN107565551A - Electricity quality evaluation method - Google Patents
Electricity quality evaluation method Download PDFInfo
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- CN107565551A CN107565551A CN201710823229.9A CN201710823229A CN107565551A CN 107565551 A CN107565551 A CN 107565551A CN 201710823229 A CN201710823229 A CN 201710823229A CN 107565551 A CN107565551 A CN 107565551A
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Abstract
The invention discloses a kind of electricity quality evaluation method, it is comprised the steps of：S1, calculate examination point power quality index limit value；S2, the data that data establishes model or monitoring and evaluation object in simulation software are provided according to user and power network；S3, obtain examining each power quality index situation a little during user power utilization；S4, obtained each power quality index is compared with respective limit value respectively；Whether S5, parameter meet index limits, if so, step S7 is performed, if it is not, performing step S6；S6, renovated, carry out emulation demonstration again, until meeting to require, perform step S7；S7, assessment are qualified.Its advantage is：Realize to pollute the quality of power supply from source and carry out management and control.
Description
Technical field
The present invention relates to a kind of electricity quality evaluation method.
Background technology
With developing rapidly for China's economy, influenceed in power network the quality of power supply load quantity and electricity consumption ratio therewith not yet
It is disconnected to rise, make the power quality problem getting worse of power network.Net, source, lotus coordinated operation carry to novel power supply, load networking condition
Go out requirements at the higher level.Therefore, load needs to carry out electricity quality evaluation before networking or increase-volume, before user power utilization agreement is signed
Can accesses quality of power supply harm caused by power network to user and dealt carefully with, and avoids exceeded user can to power grid security after accessing
Had an impact by operation and other users, bring unnecessary dispute, promote the horizontal raising of administration of power networks.
The content of the invention
It is an object of the invention to provide a kind of electricity quality evaluation method, according to power consumer and accesses the basic of power network
Situation, the issuable quality of power supply pollution of qualitative analysis, and simulation model is established in simulation software, quantitative calculation and analysis is used
The family influence to points of common connection power quality index, and limit value is compared in the process of running, if certain quality of power supply refers to
Mark is unsatisfactory for limit value requirement, then administers and carry out emulation demonstration, until each power quality index is satisfied by requiring, just allows to use
Power network is accessed at family, accomplishes to pollute the quality of power supply from source progress management and control.
In order to achieve the above object, the present invention is achieved through the following technical solutions：
A kind of electricity quality evaluation method, it is characterized in that, comprise the steps of：
S1, calculate examination point power quality index limit value；
S2, the data that data establishes model or monitoring and evaluation object in simulation software are provided according to user and power network；
S3, obtain examining each power quality index situation a little during user power utilization；
S4, obtained each power quality index is compared with respective limit value respectively；
Whether S5, parameter meet index limits, if so, step S7 is performed, if it is not, performing step S6；
S6, renovated, carry out emulation demonstration again, until meeting to require, perform step S7；
S7, assessment are qualified.
Above-mentioned electricity quality evaluation method, wherein：
Regulation in described step S6 refers to adjusting device operation conditions or installation controlling device.
Above-mentioned electricity quality evaluation method, wherein：
Described power quality index confession under directions piezoelectric voltage deviation, voltage pulsation, flickering, three-phase imbalance, harmonic wave.
Above-mentioned electricity quality evaluation method, wherein, the calculation of described flickering limit value is：
Each fluctuating load user considers that upper level dodges to next stage by the ratio between its agreement electricity capacity and total power supply capacity
The flickering limit value of the user is determined after the influence that change is transmitted；
Unique user flickering limit value first presses formulaCalculate and be connected to the total of PCC point wholes load generation flickering
Limit value, the flickering limit value of each voltage class in calculating, then by formulaCalculate the sudden strain of a muscle of single fluctuating load user
Become limit value；
Wherein, G represents that being connected to PCC points all meets the total limit value for producing flickering, LpRepresent PCC point corresponding voltage grades
Long-time flickering value PltLimit value, T represent flickering carry-over factor of the upper voltage class to next voltage class, LHRepresent a upper electricity
Press the long-time flickering value P of gradeltLimit value, EiRepresent the flickering limit value of i-th of fluctuating load user, SiRepresent i-th of user
Electricity consumption protocol capacity, StThe power supply capacity of points of common connection is represented, F represents coefficient while fluctuating load.
Above-mentioned electricity quality evaluation method, wherein：
Described examination point refers to applying for user or the power network new construction that dilatation is either applied in electricity consumption.
The present invention has advantages below compared with prior art：It is fixed according to the basic condition of power consumer and access power network
Property analysis issuable quality of power supply pollution, and simulation model is established in simulation software, quantitative calculation and analysis user is transporting
To the influence of points of common connection power quality index during row, and limit value is compared, if certain power quality index is discontented with
Sufficient limit value requirement, then administer and carry out emulation demonstration, until each power quality index is satisfied by requiring, just allows user to access
Power network, accomplish to pollute the quality of power supply from source progress management and control.
Brief description of the drawings
Fig. 1 is flow chart of the method for the present invention.
Embodiment
Below in conjunction with accompanying drawing, by describing a preferable specific embodiment in detail, the present invention is further elaborated.
As shown in figure 1, the present invention proposes a kind of electricity quality evaluation method, it is comprised the steps of：
S1, examination point power quality index limit value is calculated, wherein, described examination point refers to applying for electricity consumption or application
The user of dilatation or power network new construction；
S2, the data that data establishes model or monitoring and evaluation object in simulation software are provided according to user and power network；
S3, obtain examining each power quality index situation a little, described power quality index during user power utilization
Confession under directions piezoelectric voltage deviation, voltage pulsation, flickering, three-phase imbalance, harmonic wave；
S4, obtained each power quality index is compared with respective limit value respectively；
Whether S5, parameter meet index limits, if so, step S7 is performed, if it is not, performing step S6；
S6, renovated for example by adjusting device operation conditions or installation controlling device, then carry out emulation opinion again
Card, until meeting to require, perform step S7；
S7, assessment are qualified.
Described supply voltage deviation limit value is：A) 35kV and the positive and negative absolute value of the bias sum of above customer power supply voltage
No more than the 10% of rated voltage；B) 20kV and following three phase supply voltage tolerance are ± the 7% of rated voltage；c)220V
Single phase power supply voltage tolerance be depending on voltage+7%, -10%.
Rate of qualified voltage should be calculated according to the voltage limits of monitoring point by the statistics of voltage deviation.Voltage deviation
The chronomere of monitoring and statisticses is minute, generally total time using the time of the moon (or week, season, year) as voltage monitoring every time, electricity
The time cumulation sum for pressing the super upper limit of deviation and super lower limit is the voltage overtime, and monitoring point rate of qualified voltage is counted according to the following formula
Calculate：
In formula, γiRepresent the rate of qualified voltage of i-th of monitoring point；TuiRepresent that the super upper limit time of voltage adds up sum, unit
For minute；TdiThe super lower limit time cumulation sum of voltage is represented, unit is minute；TiThe total time of voltage monitoring is represented, unit is
Minute.
Described voltage pulsation limit value represents any one fluctuating load user caused by power system points of common connection
Variation in voltage, its limit value are relevant with variation in voltage frequency, voltage class.For relatively low (such as r≤1000 of variation in voltage frequency
Secondary/h) or the fluctuation of regular periodic voltage, its variation in voltage frequency can be determined by measuring voltage root-mean-square valve curve U (t)
Degree and variation in voltage value.
The limit value of described flickering has following two, and one kind is power system points of common connection flickering limit value, and another kind is
Points of common connection flickering limit value caused by user, wherein, the calculation of flickering limit value is caused by described user：
Each fluctuating load user considers that upper level dodges to next stage by the ratio between its agreement electricity capacity and total power supply capacity
The flickering limit value of the user is determined after the influence that change is transmitted；
Unique user flickering limit value first presses formulaCalculate and be connected to the total of PCC point wholes load generation flickering
Limit value, the flickering limit value of each voltage class in calculating, then by formulaCalculate the sudden strain of a muscle of single fluctuating load user
Become limit value；
Wherein, G represents that being connected to PCC points all meets the total limit value for producing flickering, LpRepresent PCC point corresponding voltage grades
Long-time flickering value PltLimit value, T represent flickering carry-over factor of the upper voltage class to next voltage class, LHRepresent a upper electricity
Press the long-time flickering value P of gradeltLimit value, EiRepresent the flickering limit value of i-th of fluctuating load user, SiRepresent i-th of user
Electricity consumption protocol capacity, StThe power supply capacity of points of common connection is represented, F represents coefficient while fluctuating load.
Although present disclosure is discussed in detail by above preferred embodiment, but it should be appreciated that above-mentioned
Description is not considered as limitation of the present invention.After those skilled in the art have read the above, for the present invention's
A variety of modifications and substitutions all will be apparent.Therefore, protection scope of the present invention should be limited to the appended claims.
Claims (5)
- A kind of 1. electricity quality evaluation method, it is characterised in that comprise the steps of：S1, calculate examination point power quality index limit value；S2, the data that data establishes model or monitoring and evaluation object in simulation software are provided according to user and power network；S3, obtain examining each power quality index situation a little during user power utilization；S4, obtained each power quality index is compared with respective limit value respectively；Whether S5, parameter meet index limits, if so, step S7 is performed, if it is not, performing step S6；S6, renovated, carry out emulation demonstration again, until meeting to require, perform step S7；S7, assessment are qualified.
- 2. electricity quality evaluation method as claimed in claim 1, it is characterised in that：Regulation in described step S6 refers to adjusting device operation conditions or installation controlling device.
- 3. electricity quality evaluation method as claimed in claim 1, it is characterised in that：Described power quality index confession under directions piezoelectric voltage deviation, voltage pulsation, flickering, three-phase imbalance, harmonic wave.
- 4. electricity quality evaluation method as claimed in claim 3, it is characterised in that the calculation of described flickering limit value For：Each fluctuating load user considers that upper level passes to next stage flickering by the ratio between its agreement electricity capacity and total power supply capacity The flickering limit value of the user is determined after the influence passed；Unique user flickering limit value first presses formulaCalculate and be connected to total limit value that PCC point wholes load produces flickering, The flickering limit value of each voltage class in calculating, then by formulaCalculate the flickering limit of single fluctuating load user Value；Wherein, G represents that being connected to PCC points all meets the total limit value for producing flickering, LpRepresent PCC point corresponding voltage grades it is long when Between flickering value PltLimit value, T represent flickering carry-over factor of the upper voltage class to next voltage class, LHRepresent upper voltage etc. The long-time flickering value P of levelltLimit value, EiRepresent the flickering limit value of i-th of fluctuating load user, SiRepresent the use of i-th of user Electric protocol capacity, StThe power supply capacity of points of common connection is represented, F represents coefficient while fluctuating load.
- 5. electricity quality evaluation method as claimed in claim 1, it is characterised in that：Described examination point refers to applying for user or the power network new construction that dilatation is either applied in electricity consumption.
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| CN201710823229.9A CN107565551A (en) | 2017-09-13 | 2017-09-13 | Electricity quality evaluation method |
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| CN201710823229.9A CN107565551A (en) | 2017-09-13 | 2017-09-13 | Electricity quality evaluation method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110350514A (en) * | 2019-06-12 | 2019-10-18 | 惠州电力勘察设计院有限公司 | Electric energy quality for substation management method, system and storage medium |
| 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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| CN103647276A (en) * | 2013-12-10 | 2014-03-19 | 国家电网公司 | Electric energy quality early warning system and method thereof |
| CN105353276A (en) * | 2015-11-27 | 2016-02-24 | 国网吉林省电力有限公司电力科学研究院 | Electric energy quality assessment method and apparatus |
| CN106296019A (en) * | 2016-08-17 | 2017-01-04 | 云南电网有限责任公司电力科学研究院 | Region energy quality comprehensive assessment method and system |
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2017
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Patent Citations (3)
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| CN103647276A (en) * | 2013-12-10 | 2014-03-19 | 国家电网公司 | Electric energy quality early warning system and method thereof |
| CN105353276A (en) * | 2015-11-27 | 2016-02-24 | 国网吉林省电力有限公司电力科学研究院 | Electric energy quality assessment method and apparatus |
| CN106296019A (en) * | 2016-08-17 | 2017-01-04 | 云南电网有限责任公司电力科学研究院 | Region energy quality comprehensive assessment method and system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110350514A (en) * | 2019-06-12 | 2019-10-18 | 惠州电力勘察设计院有限公司 | Electric energy quality for substation management method, system and storage medium |
| 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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