CN109596889A - A kind of low-voltage network line impedance on-line measurement system and method - Google Patents
A kind of low-voltage network line impedance on-line measurement system and method Download PDFInfo
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- CN109596889A CN109596889A CN201910025312.0A CN201910025312A CN109596889A CN 109596889 A CN109596889 A CN 109596889A CN 201910025312 A CN201910025312 A CN 201910025312A CN 109596889 A CN109596889 A CN 109596889A
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
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Abstract
A kind of low-voltage network line impedance on-line measurement system and method, system is mainly made of main website platform and several acquisition terminals, acquisition terminal is by primary processor, metering chip, storage chip, clock chip, the main components such as GPRS communication module composition, under primary processor control, timeticks are obtained by clock chip first, then it is measured by metering chip and obtains the basic power information such as each voltage at node electric current of power distribution network, and it is recorded in storage chip, it is calculated again by processor using related algorithm and obtains line impedance parameter value, main website platform is transferred data to finally by GPRS communication module.The invention proposes a kind of feasible low-voltage network line impedance on-line measurement system of economic technology and methods, and accessing new power equipment and system evaluation and line fault anticipation to power grid has important references meaning.
Description
Technical field
The invention belongs to low-voltage network line impedance fields of measurement, and in particular to a kind of low-voltage network line impedance exists
Line measuring system and method.
Background technique
Nerve endings of the low-voltage network as entire bulk power grid, couples huge numbers of families, and operating status directly affects
Power supply quality, the production of client, life are brought and are directly affected.Wherein, low-voltage network line impedance parameter is always electricity
The key issues for netting research, accessing new power equipment and system evaluation and line fault anticipation to power grid has important ginseng
Examine meaning.
Summary of the invention
The present invention aiming at the shortcomings in the prior art, provides a kind of low-voltage network line impedance on-line measurement system and side
Method.
To achieve the above object, the invention adopts the following technical scheme:
A kind of low-voltage network line impedance on-line measurement system characterized by comprising main website platform and several acquisitions
Terminal；The basic power information of the acquisition terminal measurement low-voltage network corresponding line, calculates line impedance parameter value, then
Main website platform is sent to by GPRS network.
To optimize above-mentioned technical proposal, the concrete measure taken further include:
The acquisition terminal includes primary processor, metering chip, storage chip, clock chip, GPRS communication module, in master
Under the control of processor, timeticks are obtained by clock chip first, it is each then to measure acquisition power distribution network by metering chip
Basic power information at node, and it is recorded in storage chip, then calculate by primary processor and obtain line impedance parameter value, most
Main website platform is transferred data to by GPRS communication module afterwards；Wherein, the basic power information includes voltage and current.
Furthermore, it is also proposed that a kind of measurement side using low-voltage network line impedance on-line measurement system as described above
Method, which is characterized in that on acquisition terminal after electricity operation, with " day " for the period, execute following steps:
Step 1: resetting constant M, constant Rt, constant Sn；
Step 2: according to fixed intervals T, measurement obtains current voltage Uj, electric current Ij, wherein 1≤j≤N, N=24*60*
60/T；
Step 3: voltage Ui, the electric current Ii recorded according to previous cycle calculates voltage change Δ Ui=| Uj-Ui |, electricity
Flow changing value Δ Ii=| Ij-Ii |, wherein i=j-1,0≤i≤N-1；
Step 4: route real-time impedance value Ri is calculated, if 0 < Δ Ui < UCLMT and Δ Ii ≠ 0, Ri=Δ Ui/ Δ Ii,
M 1, the Rt that adds up adds up Ri, otherwise Ri=0, and wherein UCLMT indicates voltage jump exception limit value；
Step 5: judging whether the same day terminates, continue step 2 if being not finished, otherwise carry out step 6；
Step 6: calculatingWherein Ri ≠ 0, Ravg=Rt/M, Ravg indicate route
Impedance mean value；
Step 7: line impedance real value R0, R1, R2 ... Rx of the statistics same day all measurements are in confidence intervalInterior quantity is K, wherein x=N-1；
Step 8: calculating line impedance parameter valueWherein Ri is in confidence intervalIt is interior；
Step 9: by GPRS module, same day line impedance parameter value RL being sent to main website platform.
T value 5 seconds, UCLMT value 4.0V.
The beneficial effects of the present invention are: proposing a kind of feasible low-voltage network line impedance on-line measurement of economic technology
System and method, accessing new power equipment and system evaluation and line fault anticipation to power grid has important references meaning.
Detailed description of the invention
Fig. 1 is the whole composition schematic diagram of system.
Fig. 2 is acquisition terminal composition block diagram.
Fig. 3 is the flow diagram of method.
Specific embodiment
In conjunction with the accompanying drawings, the present invention is further explained in detail.
System integrally forms as shown in Figure 1, being mainly made of main website platform and several acquisition terminals, and acquisition terminal measurement is low
The basic informations such as power grid corresponding line voltage and current are press-fitted, calculate line impedance parameter value, then send to by GPRS network
Main website platform.
For acquisition terminal as key equipment, composition block diagram is as shown in Figure 2.Acquisition terminal by primary processor, metering chip,
The main components such as storage chip, clock chip, GPRS communication module composition passes through clock core under primary processor control first
Piece obtains timeticks, is then measured by metering chip and obtains the basic power information such as each voltage at node electric current of power distribution network,
And it is recorded in storage chip, then calculate by processor using related algorithm and obtain line impedance parameter value, finally by GPRS
Communication module transfers data to main website platform.
Measurement method is as follows:
On acquisition terminal after electricity operation, with " day " for the period, following steps are executed:
Step 1: resetting constant M, constant Rt, constant Sn；
Step 2: according to fixed intervals T, measurement obtains current voltage Uj, electric current Ij, wherein 1≤j≤N, N=24*60*
60/T, T value 5 seconds；
Step 3: voltage Ui, the electric current Ii recorded according to previous cycle, calculating voltage change Δ Ui (Δ Ui=| Uj-Ui
|), current variation value Δ Ii (Δ Ii=| Ij-Ii |), wherein i=j-1,0≤i≤N-1；
Step 4: route real-time impedance value Ri is calculated, if 0 < Δ Ui < UCLMT and Δ Ii ≠ 0, Ri=Δ Ui/ Δ Ii,
M 1, the Rt that adds up adds up Ri, otherwise Ri=0, and wherein UCLMT indicates voltage jump exception limit value, value 4.0V；
If Δ Ui > UCLMT, system thinks that this measurement point is power distribution network exception overshoot current or other abnormal generations, meter
Automatic rejection falls this measurement point when calculation；
Step 5: judging whether the same day terminates, continue step 2 if being not finished, otherwise carry out step 6；
Step 6: calculatingWherein Ri ≠ 0, Ravg=Rt/M, Ravg indicate route
Impedance mean value；
Line impedance number of measurement values is more, and Normal Distribution Characteristics can integrally be presented, and is calculated using normal distribution correlation formula,
Further obtain effective sample；
Step 7: line impedance real value R0, R1, R2 ... Rx of the statistics same day all measurements are in confidence intervalInterior quantity is K, wherein x=N-1；
Step 8: calculating line impedance parameter valueWherein Ri is in confidence intervalIt is interior；
Step 9: by GPRS module, same day line impedance parameter value RL being sent to main website platform.
The above is only the preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-described embodiment,
All technical solutions belonged under thinking of the present invention all belong to the scope of protection of the present invention.It should be pointed out that for the art
For those of ordinary skill, several improvements and modifications without departing from the principles of the present invention should be regarded as protection of the invention
Range.
Claims (4)
1. a kind of low-voltage network line impedance on-line measurement system characterized by comprising main website platform and several acquisitions are eventually
End；The basic power information of the acquisition terminal measurement low-voltage network corresponding line, calculates line impedance parameter value, then lead to
It crosses GPRS network and sends main website platform to.
2. a kind of low-voltage network line impedance on-line measurement system as described in claim 1, it is characterised in that: the acquisition
Terminal includes primary processor, metering chip, storage chip, clock chip, GPRS communication module, under the control of primary processor,
Timeticks are obtained by clock chip first, the basic electric power obtained at each node of power distribution network is then measured by metering chip
Information, and it is recorded in storage chip, then calculate by primary processor and obtain line impedance parameter value, mould is communicated finally by GPRS
Block transfers data to main website platform；Wherein, the basic power information includes voltage and current.
3. a kind of measurement method using low-voltage network line impedance on-line measurement system as claimed in claim 1 or 2,
It is characterized in that, on acquisition terminal after electricity operation, with " day " for the period, executes following steps:
Step 1: resetting constant M, constant Rt, constant Sn；
Step 2: according to fixed intervals T, measurement obtains current voltage Uj, electric current Ij, wherein 1≤j≤N, N=24*60*60/T；
Step 3: voltage Ui, the electric current Ii recorded according to previous cycle calculates voltage change Δ Ui=| Uj-Ui |, electric current becomes
Change value Δ Ii=| Ij-Ii |, wherein i=j-1,0≤i≤N-1；
Step 4: calculating route real-time impedance value Ri, if 0 < Δ Ui < UCLMT and Δ Ii ≠ 0, Ri=Δ Ui/ Δ Ii, M is tired
1, Rt is added to add up Ri, otherwise Ri=0, wherein UCLMT indicates voltage jump exception limit value；
Step 5: judging whether the same day terminates, continue step 2 if being not finished, otherwise carry out step 6；
Step 6: calculatingWherein Ri ≠ 0, Ravg=Rt/M, Ravg indicate line impedance
Mean value；
Step 7: line impedance real value RO, R1, R2 ... Rx of the statistics same day all measurements are in confidence intervalInterior quantity is K, wherein x=N-1；
Step 8: calculating line impedance parameter valueWherein Ri is in confidence intervalIt is interior；
Step 9: by GPRS module, same day line impedance parameter value RL being sent to main website platform.
4. measurement method as claimed in claim 3, it is characterised in that: T value 5 seconds, UCLMT value 4.0V.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110297140A (en) * | 2019-06-28 | 2019-10-01 | 北京机械设备研究所 | A kind of failure prediction method and device of distribution system |
| CN111984925A (en) * | 2020-07-29 | 2020-11-24 | 江苏方天电力技术有限公司 | Circuit abnormity positioning method based on loop impedance, storage medium and computing equipment |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104698320A (en) * | 2015-03-23 | 2015-06-10 | 济南大学 | On-line measuring device and method for electrical parameters of power transmission and distribution line |
-
2019
- 2019-01-10 CN CN201910025312.0A patent/CN109596889A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104698320A (en) * | 2015-03-23 | 2015-06-10 | 济南大学 | On-line measuring device and method for electrical parameters of power transmission and distribution line |
Non-Patent Citations (1)
| Title |
|---|
| 杨友松等: "《大学物理实验基础》", 31 January 2013 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110297140A (en) * | 2019-06-28 | 2019-10-01 | 北京机械设备研究所 | A kind of failure prediction method and device of distribution system |
| CN111984925A (en) * | 2020-07-29 | 2020-11-24 | 江苏方天电力技术有限公司 | Circuit abnormity positioning method based on loop impedance, storage medium and computing equipment |
| CN111984925B (en) * | 2020-07-29 | 2024-03-12 | 江苏方天电力技术有限公司 | Circuit abnormality positioning method based on loop impedance, storage medium and computing device |
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Application publication date: 20190409 |