CN109459605B - Real-time monitoring method for bus voltage of substation - Google Patents
Real-time monitoring method for bus voltage of substation Download PDFInfo
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- CN109459605B CN109459605B CN201810188740.0A CN201810188740A CN109459605B CN 109459605 B CN109459605 B CN 109459605B CN 201810188740 A CN201810188740 A CN 201810188740A CN 109459605 B CN109459605 B CN 109459605B
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 title claims abstract description 16
- 230000009466 transformation Effects 0.000 claims abstract 2
- 238000005070 sampling Methods 0.000 claims description 35
- 238000012423 maintenance Methods 0.000 claims description 14
- 238000012937 correction Methods 0.000 claims description 11
- 230000035772 mutation Effects 0.000 claims description 10
- 238000012797 qualification Methods 0.000 abstract description 4
- 230000005611 electricity Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013480 data collection Methods 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
- G01R19/16576—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing DC or AC voltage with one threshold
Abstract
The invention discloses a real-time monitoring method for bus voltage of a substation. It comprises the following steps: dividing the bus voltage into N types, and setting different voltage qualified ranges for each type of bus voltage; periodically collecting bus voltage of a target transformer substation; and generating corresponding alarm according to the acquired bus voltage value. The invention fully utilizes the data acquisition and monitoring control system of the existing substation, mainly utilizes software to realize the real-time monitoring of the bus voltage of the substation on the premise of adding few hardware devices, and can meet the examination requirement of the national power grid on the voltage qualification rate under the condition of extremely low transformation cost for the substation.
Description
Technical Field
The invention relates to the technical field of bus voltage monitoring, in particular to a real-time monitoring method for bus voltage of a substation.
Background
At present, the national power grid has more and more strict examination on the voltage qualification rate of the transformer substation. For some transformer substations which utilize natural energy to generate electricity, voltage fluctuation is large due to uncertainty of geographic environment, and voltage control is difficult. For example, Zhejiang Li shui is in mountain areas, so the transformer substation is mostly used for hydroelectric power generation, and the voltage fluctuation of the transformer substation is large due to the instability of the water flow in a rapid and slow manner, so that the voltage control is difficult. However, a method special for bus voltage monitoring is lacked at present, so that the voltage qualification rate of certain transformer substations which utilize natural energy to generate electricity cannot meet the examination requirements of national power grids.
Disclosure of Invention
The invention aims to solve the problems and provides a real-time monitoring method for bus voltage of a substation, which can monitor the bus voltage in real time and carry out early warning when the bus voltage is abnormal.
In order to solve the problems, the invention adopts the following technical scheme:
the invention discloses a real-time monitoring method for bus voltage of a substation, which comprises the following steps:
s1: setting a bus voltage maximum threshold value Vmax and a bus voltage minimum threshold value Vmin;
setting the maintenance state flag bit Ck to 0, and setting a maintenance state threshold CK;
setting the mutation time flag position Tb to be 0, and setting a mutation time threshold TB;
setting a mutation threshold value delta V;
initializing a time array T;
dividing the bus voltage into N types, and setting different voltage qualified ranges for each type of bus voltage;
s2: periodically collecting the bus voltage of a target transformer substation according to a preset sampling period, and setting the bus voltage collected at the current sampling time t as vt；
S3: if v ist0 or vt≤VminOr vt≥VmaxIf so, Ck is equal to Ck +1, whether Ck is smaller than the maintenance state threshold CK is judged, and if yes, the bus voltage v at the sampling time t is abandonedtReturning to the step S2, collecting the bus voltage at the next sampling moment, if not, checking whether the transformer substation is in the maintenance state, if so, exiting the method, and if not, returning to the step S2, collecting the next sampling momentThe bus voltage of (d);
if v istNot equal to 0 and Vmin＜vt＜VmaxThen, go to step S4;
s4: reading the bus voltage v at the last sampling time t-1t-1Calculating the bus voltage sudden change value delta v of the current sampling time tt，Δvt＝|vt-vt-1If Δ vtIf the sampling time T is greater than or equal to the time value Δ V, a voltage sudden change alarm is sent, Tb is Tb +1, the current sampling time T is stored in a time array T, the step S5 is carried out, and if the sampling time T is greater than or equal to the time value Δ V, a voltage sudden change alarm is sent out, the current sampling time T is stored in thetIf < Δ V, the process proceeds to step S6;
s5: if Tb is larger than or equal to TB, outputting a time array T, reserving the time array T to the local, carrying out time early warning, and if Tb is smaller than TB, returning to the step S2;
s6: judging the corresponding bus voltage type according to the target transformer substation, obtaining the corresponding voltage qualified range according to the determined bus voltage type, and judging vtAnd if the voltage is not beyond the qualified voltage range, returning to the step S2.
Preferably, N is more than or equal to 2, and the qualified range of the nth bus voltage is [ V ]nmin，Vnmax]，Vnmin、VnmaxThe N-th bus voltage is the minimum value and the maximum value, respectively, and N is 1.
Preferably, in step S1, the bus voltage is divided into a type 1 bus voltage, a type 2 bus voltage and a type 3 bus voltage, wherein the type 1 bus voltage corresponds to an ac 10kV rural power grid bus voltage, and the voltage acceptable range is [ V [ ]1min，V1max]，V1min、V1maxThe minimum value and the maximum value of the 1 st bus voltage are respectively; the class 2 bus voltage corresponds to the AC 110kV bus voltage, and the voltage qualified range is [ V ]2min，V2max]，V2min、V2maxThe minimum value and the maximum value of the 2 nd bus voltage are respectively; the class 3 bus voltage corresponds to the AC 220kV bus voltage, and the voltage qualified range is [ V ]3min，V3max]，V3min、V3maxThe minimum value and the maximum value of the 3 rd bus voltageThe value is obtained.
Preferably, the step S1 further includes the steps of: setting different voltage correction coefficients for each type of bus voltage, wherein the voltage correction coefficient of the nth type of bus voltage is lambdan(ii) a In the step S2, the v is obtained by multiplying the bus voltage collected at the current sampling time t by the corresponding voltage correction coefficient according to the bus voltage type corresponding to the target substationt。
The invention has the beneficial effects that: the data acquisition and monitoring control system of the existing substation is fully utilized, and the real-time monitoring of the bus voltage of the substation is mainly realized by software on the premise of adding few hardware devices. For a substation, the requirement of the national power grid for checking the voltage qualification rate can be met under the condition of extremely low reconstruction cost.
Drawings
FIG. 1 is a flow chart of the present invention.
Detailed Description
The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings.
Example (b): the method for monitoring the bus voltage of the substation in real time in the embodiment, as shown in fig. 1, includes the following steps:
s1: initialization of the system, including the following:
setting a bus voltage maximum threshold value Vmax and a bus voltage minimum threshold value Vmin;
setting the maintenance state flag bit Ck to 0, and setting a maintenance state threshold CK;
setting the mutation time flag position Tb to be 0, and setting a mutation time threshold TB;
setting a mutation threshold value delta V;
initializing a time array T;
dividing the bus voltage into a type 1 bus voltage, a type 2 bus voltage and a type 3 bus voltage, wherein the type 1 bus voltage corresponds to the AC 10kV rural power grid bus voltage, and the voltage qualified range is [ V ]1min，V1max]，V1min、V1maxThe minimum value and the maximum value of the 1 st bus voltageA large value; the class 2 bus voltage corresponds to the AC 110kV bus voltage, and the voltage qualified range is [ V ]2min，V2max]，V2min、V2maxThe minimum value and the maximum value of the 2 nd bus voltage are respectively; the class 3 bus voltage corresponds to the AC 220kV bus voltage, and the voltage qualified range is [ V ]3min，V3max]，V3min、V3maxThe minimum value and the maximum value of the 3 rd bus voltage are respectively;
setting different voltage correction coefficients for each type of bus voltage, wherein the voltage correction coefficient of the nth type of bus voltage is lambdan(ii) a Setting voltage correction factor lambda of 1 st bus voltage1Is a random number in the range of 10-10.7; setting voltage correction factor lambda of 2 nd bus voltage2Is a random number in the range of-3% to 7%; setting voltage correction factor lambda of 3 rd bus voltage3Is-7% to a random number in the range of 7%;
s2: taking M as a sampling period, periodically collecting the bus voltage of a target transformer substation through a data collection and monitoring control system of the transformer substation, and setting the bus voltage collected at the current sampling time t as vt，vt＝λn×vt', wherein vt' is the original bus voltage collected at the current sampling time t; (for example, if the type 2 bus voltage corresponds to the transformer substation, the bus voltage acquired at the current sampling time t is vt，vt＝λ2×vt’)；
S3: if v ist0 or vt≤VminOr vt≥VmaxIf so, Ck is equal to Ck +1, whether Ck is smaller than the maintenance state threshold CK is judged, and if yes, the bus voltage v at the sampling time t is abandonedtReturning to the step S2, collecting the bus voltage at the next sampling moment, if not, checking whether the transformer substation is in a maintenance state, if the transformer substation is in the maintenance state, exiting the method, and if the transformer substation is not in the maintenance state, returning to the step S2, and collecting the bus voltage at the next sampling moment;
if v istNot equal to 0 and Vmin＜vt＜VmaxThen, go to step S4;
s4: reading the bus voltage v at the last sampling time t-1t-1Calculating the bus voltage sudden change value delta v of the current sampling time tt，Δvt＝|vt-vt-1If Δ vtIf the sampling time T is greater than or equal to the time value Δ V, a voltage sudden change alarm is sent, Tb is Tb +1, the current sampling time T is stored in a time array T, the step S5 is carried out, and if the sampling time T is greater than or equal to the time value Δ V, a voltage sudden change alarm is sent out, the current sampling time T is stored in thetIf < AV, go to step S6;
s5: if Tb is larger than or equal to the mutation time threshold TB, outputting a time array T, reserving the time array T to the local, carrying out time early warning, enabling a dispatcher to take corresponding preparation measures in a time period corresponding to the time array T every day in the future, and if Tb is smaller than TB, returning to the step S2;
s6: judging the corresponding bus voltage type according to the target transformer substation, obtaining the corresponding voltage qualified range according to the determined bus voltage type, and judging vtAnd if the voltage is not beyond the qualified voltage range, returning to the step S2.
Claims (4)
1. A real-time monitoring method for bus voltage of a substation is characterized by comprising the following steps:
s1: setting the maximum threshold value V of the bus voltagemaxAnd minimum bus voltage threshold Vmin；
Setting the maintenance state flag bit Ck to 0, and setting a maintenance state threshold CK;
setting the mutation time flag position Tb to be 0, and setting a mutation time threshold TB;
setting a mutation threshold value delta V;
initializing a time array T;
dividing the bus voltage into N types, and setting different voltage qualified ranges for each type of bus voltage;
s2: periodically collecting the bus voltage of a target substation according to a preset sampling period, and setting the bus voltage collected at the current sampling time t as vt；
S3: if v ist=0 or vt≤VminOr vt≥VmaxThen, thenCk = Ck +1, judging whether Ck is smaller than a maintenance state threshold value CK, if so, abandoning the bus voltage v at the sampling time ttReturning to the step S2, collecting the bus voltage at the next sampling moment, if not, checking whether the target substation is in the maintenance state, if so, exiting the method, and if not, returning to the step S2, and collecting the bus voltage at the next sampling moment;
if v istNot equal to 0 and Vmin<vt<VmaxThen, go to step S4;
s4: reading the bus voltage v at the last sampling time t-1t-1Calculating the bus voltage abrupt change value delta v of the current sampling time tt，△vt= |vt- vt-1If Δ vtAnd if the voltage is more than or equal to the delta V, sending a voltage sudden change alarm, Tb = Tb +1, storing the current sampling time T into a time array T, entering a step S5, and if the delta V is more than or equal to the delta V, storing the current sampling time T into a time array Tt<Δ V, step S6 is entered;
s5: if Tb is larger than or equal to TB, outputting a time array T, reserving the time array T to the local, carrying out time early warning, and if Tb is smaller than TB, returning to the step S2;
s6: judging the corresponding bus voltage type according to the target substation, obtaining the corresponding voltage qualified range according to the determined bus voltage type, and judging vtAnd if the voltage is not beyond the qualified voltage range, returning to the step S2.
2. The method for monitoring the bus voltage of the substation in real time as claimed in claim 1, wherein N is greater than or equal to 2, and the qualified range of the nth bus voltage is [ V ]nmin,Vnmax]， Vnmin、VnmaxThe N-th bus voltage is the minimum and maximum, N =1, …, N, respectively.
3. The method as claimed in claim 1, wherein in step S1, the bus voltage is divided into a type 1 bus voltage, a type 2 bus voltage and a type 3 bus voltageThe class 1 bus voltage corresponds to the AC 10kV rural power grid bus voltage, and the voltage qualified range is [ V ]1min,V1max]，V1min、V1maxThe minimum value and the maximum value of the 1 st bus voltage are respectively; the class 2 bus voltage corresponds to the AC 110kV bus voltage, and the voltage qualified range is [ V ]2min,V2max]，V2min、V2maxThe minimum value and the maximum value of the 2 nd bus voltage are respectively; the class 3 bus voltage corresponds to the AC 220kV bus voltage, and the voltage qualified range is [ V ]3min,V3max]，V3min、V3maxThe minimum and maximum values of the bus voltage class 3 are shown.
4. A method for monitoring bus voltage of a transformation substation in real time according to claim 1, 2 or 3, wherein the step S1 further comprises the steps of: setting different voltage correction coefficients for each type of bus voltage, wherein the voltage correction coefficient of the nth type of bus voltage is lambdan；
In the step S2, the v is obtained by multiplying the bus voltage collected at the current sampling time t by the corresponding voltage correction coefficient according to the bus voltage type corresponding to the target substationt。
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| CN104280598A (en) * | 2014-09-19 | 2015-01-14 | 合肥荣事达三洋电器股份有限公司 | Microwave oven power detection method and system |
| CN106443361A (en) * | 2016-11-14 | 2017-02-22 | 深圳供电局有限公司 | On-line abnormity detection method, apparatus and system in power grid |
| CN106684881A (en) * | 2016-11-28 | 2017-05-17 | 国家电网公司 | Bus voltage regulating method and device used in district dispatching AVC system |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102163876A (en) * | 2010-12-29 | 2011-08-24 | 上海申瑞电力科技股份有限公司 | Voltage partitioning method for automatic voltage control |
| CN102495306A (en) * | 2011-11-25 | 2012-06-13 | 北京金风科创风电设备有限公司 | Method for judging operation and outage states of equipment of micro-grid power system |
| CN104280598A (en) * | 2014-09-19 | 2015-01-14 | 合肥荣事达三洋电器股份有限公司 | Microwave oven power detection method and system |
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| CN106684881A (en) * | 2016-11-28 | 2017-05-17 | 国家电网公司 | Bus voltage regulating method and device used in district dispatching AVC system |
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