CN1571237A - Dynamic control method for capacitor switching in low-voltage reactive compensation - Google Patents

Dynamic control method for capacitor switching in low-voltage reactive compensation Download PDF

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Publication number
CN1571237A
CN1571237A CN 200410014780 CN200410014780A CN1571237A CN 1571237 A CN1571237 A CN 1571237A CN 200410014780 CN200410014780 CN 200410014780 CN 200410014780 A CN200410014780 A CN 200410014780A CN 1571237 A CN1571237 A CN 1571237A
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China
Prior art keywords
capacitor
switching
voltage difference
voltage
difference delta
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Granted
Application number
CN 200410014780
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Chinese (zh)
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CN1320720C (en
Inventor
许杏桃
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jiangsu Anfang Electric Power Technology Co ltd
Taizhou Anfang Electric Technology Co ltd
Taizhou Suyuan Kedian Co ltd
State Grid Corp of China SGCC
State Grid Jiangsu Electric Power Co Ltd
Taizhou Power Supply Co of Jiangsu Electric Power Co
Original Assignee
KEDIAN CO Ltd SUYUAN GROUP TAIZHOU
Taizhou Power Supply Co of Jiangsu Electric Power Co
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Publication date
Application filed by KEDIAN CO Ltd SUYUAN GROUP TAIZHOU, Taizhou Power Supply Co of Jiangsu Electric Power Co filed Critical KEDIAN CO Ltd SUYUAN GROUP TAIZHOU
Priority to CNB2004100147801A priority Critical patent/CN1320720C/en
Publication of CN1571237A publication Critical patent/CN1571237A/en
Application granted granted Critical
Publication of CN1320720C publication Critical patent/CN1320720C/en
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30Reactive power compensation

Abstract

The invention provides a capacitor switching dynamic-controlling method in low voltage reactive power compensation, as Ui+Delta <Use and reactive power Qf > reactive power Qe, switching the capacitor on the electric network; as Ui-Delta >198 and Qf <0, switching the capacitor off the electric network. It can dynamically calculate the threshold value after switching-on and -off the capacitor to determine the switched capacitor capacity, and the capacitor can not generate switching vibration, assuring the working safety of the electric network and equipment.

Description

The kinetic controlling equation method of capacitor switching in the low-pressure reactive compensation
Technical field
The present invention relates to the kinetic controlling equation method of capacitor switching in a kind of low-pressure reactive compensation.
Background technology
In the low-pressure reactive compensation through regular meeting throw in-of oscillation appears; because the character of each electrical network is different; the voltage magnitude that raises before and after the building-out capacitor switching and reduce is different; like this when grouping automatic switching electric capacity; voltage is not lower than lower limit when dropping into a certain group capacitor; and be higher than its higher limit after dropping into, so under the effect of automatic controller, carry out switching repeatedly, the system works instability.
Summary of the invention
The invention provides the dynamic determination methods of capacitor switching in a kind of low-pressure reactive compensation, it can be according to the operation of power networks situation, and dynamic budget drops into the threshold value behind the excision capacitor, to determine the switching capacity of capacitor, the switching concussion can not take place in capacitor, guarantees electrical network and device trouble free service.
The present invention is achieved in that the kinetic controlling equation method that capacitor drops in a kind of low-pressure reactive compensation, and it is performed such:
1) the magnitude of voltage U on the electrical network before and after the Measurement of capacitor switching 1And U 2, calculating the voltage difference delta U of action front and back, Δ U is U 2Deduct U 1Absolute value;
2) measure current magnitude of voltage U i
3) basis for estimation of capacitor input: as magnitude of voltage U iWith voltage difference delta U sum before and after the action of switching last time less than the upper voltage limit value Use that is allowed, and the reactive power Q in the electrical network fReactive power Q greater than the capacitor that will drop into cThe time, i.e. U i+ Δ U<Use and Q f>Q cThe time, capacitor is put on the electrical network.
When judging that capacitor drops into used voltage difference delta U can be for the same day before voltage difference before and after the period switching; Used voltage difference delta U can be the voltage difference before and after the switching of same period of the previous day this week; Used voltage difference delta U also can be the voltage difference before and after the switching of same on the same day period of last week.
The dynamic determination methods of capacitor excision in a kind of low-pressure reactive compensation, it is performed such:
1) the magnitude of voltage U on the electrical network before and after the Measurement of capacitor switching 1And U 2, calculating the voltage difference delta U of action front and back, Δ U is U 2Deduct U 1Absolute value;
2) measure current magnitude of voltage U i
3) basis for estimation of capacitor excision: as magnitude of voltage U iWith the difference of voltage difference delta U before and after the action of switching last time greater than 198V, and the reactive power Q in the electrical network fLess than 0 o'clock, i.e. U i-Δ U>198 and Q f<0 o'clock, capacitor is excised from electrical network.
Voltage difference before used voltage difference delta U can be the same day when judging the excision capacitor before and after the period switching; Used voltage difference delta U is the voltage difference before and after the switching of same period of the previous day this week; Used voltage difference delta U is the voltage difference before and after the switching of same on the same day period of last week.
After adopting as above technical scheme, capacitor switching control is to decide this whether to want switched capacitor according to the voltage change after last time moving, just can be according to the operation of power networks situation, dynamic budget drops into the threshold value behind the excision capacitor, to determine the switching capacity of capacitor, the assurance system works is stable, and the switching concussion can not take place.Before and after in one day during the operation of power networks situation basically identical of period, the voltage difference of a period switching front and back dynamically judges whether to want switched capacitor before the same day with regard to getting.When front and back during two days same period operation of power networks situation basically identical, dynamically judge whether to want switched capacitor with regard to the voltage difference of getting before and after the switching of same period of the previous day this week.When Saturday, Sunday and operation of power networks situation at ordinary times have than big difference, dynamically judge whether to want switched capacitor with regard to the voltage difference of getting last switching front and back of same on the same day period in a week.
Description of drawings
Fig. 1 is the theory diagram of an embodiment of utilization control method of the present invention
Embodiment
According to shown in Figure 1, the reactive power compensator of utilization control method of the present invention is achieved in that data acquisition is that the high performance voltage changer of utilization is isolated and conversion, high-voltage signal is become weak electric signal, through variable connector gating successively, deliver to operational amplifier and zoom into desired signal, by the high-speed a/d change-over circuit analog quantity that collects is converted into digital quantity, the instantaneous value data of the three-phase voltage that collects are sent into the data storage of microprocessor, use for control relatively.
When capacitor switching takes place, with the magnitude of voltage U before the action 1Be pressed into storehouse, gather action back magnitude of voltage U 2, calculating the voltage difference delta U of switching action front and back, Δ U is U 2Deduct U 1Absolute value.
Reactive power compensator is gathered current magnitude of voltage in real time, as magnitude of voltage U iWith voltage difference delta U sum before and after the action of switching last time less than the upper voltage limit value Use that is allowed, and the reactive power Q in the electrical network fReactive power Q greater than the capacitor that will drop into cThe time, i.e. U i+ Δ U<Use and Q f>Q cThe time, capacitor is put on the electrical network.As magnitude of voltage U iWith the difference of voltage difference delta U before and after the action of switching last time greater than 198V, and the reactive power Q in the electrical network fLess than 0 o'clock, i.e. U i-Δ U>198 and Q f<0 o'clock, capacitor is excised from electrical network.
When judging the excision of capacitor input used voltage difference delta U can be for the same day before voltage difference before and after the period switching; Used voltage difference delta U can be the voltage difference before and after the switching of same period of the previous day this week; Used voltage difference delta U also can be the voltage difference before and after the switching of same on the same day period of last week.Can decide on the ruuning situation of electrical network and the system situation of reactive power compensator during selection, when the device serviceability is strong, can store a large amount of voltage difference delta U, just can get the voltage difference of switching front and back of same period of the previous day, perhaps the voltage difference before and after the switching of same on the same day period of last week is come the switching of control capacitor.

Claims (8)

1, the kinetic controlling equation method that capacitor drops in a kind of low-pressure reactive compensation, it is performed such:
1) the magnitude of voltage U on the electrical network before and after the Measurement of capacitor switching 1And U 2, calculating the voltage difference delta U of action front and back, Δ U is U 2Deduct U 1Absolute value;
2) measure current magnitude of voltage U i
3) basis for estimation of capacitor input: as magnitude of voltage U iWith voltage difference delta U sum before and after the action of switching last time less than the upper voltage limit value Use that is allowed, and the reactive power Q in the electrical network fReactive power Q greater than the capacitor that will drop into cThe time, i.e. U i+ Δ U<Use and Q f>Q cThe time, capacitor is put on the electrical network.
2, the kinetic controlling equation method of capacitor input according to claim 1 is characterized in that described voltage difference delta U is the voltage difference before and after the period switching before the same day.
3, the kinetic controlling equation method of capacitor input according to claim 1 is characterized in that described voltage difference delta U is the voltage difference before and after the switching of same period of the previous day this week.
4, the kinetic controlling equation method of capacitor input according to claim 1 is characterized in that described voltage difference delta U is the voltage difference before and after the switching of same on the same day period of last week.
5, the kinetic controlling equation method of capacitor excision in a kind of low-pressure reactive compensation, it is performed such:
1) the magnitude of voltage U on the electrical network before and after the Measurement of capacitor switching 1And U 2, calculating the voltage difference delta U of action front and back, Δ U is U 2Deduct U 1Absolute value;
2) measure current magnitude of voltage U i
3) basis for estimation of capacitor excision: as magnitude of voltage U iWith the difference of voltage difference delta U before and after the action of switching last time greater than 198V, and the reactive power Q in the electrical network fLess than 0 o'clock, i.e. U i-Δ U>198 and Q f<0 o'clock, capacitor is excised from electrical network.
6, the kinetic controlling equation method of capacitor input according to claim 5 is characterized in that described voltage difference delta U is the voltage difference before and after the period switching before the same day.
7, the kinetic controlling equation method of capacitor input according to claim 5 is characterized in that described voltage difference delta U is the voltage difference before and after the switching of same period of the previous day this week.
8, the kinetic controlling equation method of capacitor input according to claim 5 is characterized in that described voltage difference delta U is the voltage difference before and after the switching of same on the same day period of last week.
CNB2004100147801A 2004-04-29 2004-04-29 Dynamic control method for capacitor switching in low-voltage reactive compensation Expired - Lifetime CN1320720C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CNB2004100147801A CN1320720C (en) 2004-04-29 2004-04-29 Dynamic control method for capacitor switching in low-voltage reactive compensation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNB2004100147801A CN1320720C (en) 2004-04-29 2004-04-29 Dynamic control method for capacitor switching in low-voltage reactive compensation

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CN1571237A true CN1571237A (en) 2005-01-26
CN1320720C CN1320720C (en) 2007-06-06

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100438256C (en) * 2006-11-03 2008-11-26 德力西集团仪器仪表有限公司 Power-less compensation control method
CN101924369A (en) * 2010-09-07 2010-12-22 沈阳博来德滋电子科技有限公司 Dynamic reactive power compensation method of intelligent low-pressure meter reading
CN105703377A (en) * 2016-03-14 2016-06-22 重庆明斯克电气有限责任公司 Dynamic switching control circuit for medium-voltage power capacitor

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2188674A1 (en) * 1994-04-29 1995-11-09 Robert Anthony Schlueter Method for improving voltage stability security in a power transmission system
CN1118914C (en) * 2000-02-25 2003-08-20 泰州供电局 Autocontrol system for reactive voltage of local electric power network

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100438256C (en) * 2006-11-03 2008-11-26 德力西集团仪器仪表有限公司 Power-less compensation control method
CN101924369A (en) * 2010-09-07 2010-12-22 沈阳博来德滋电子科技有限公司 Dynamic reactive power compensation method of intelligent low-pressure meter reading
CN101924369B (en) * 2010-09-07 2014-08-13 沈阳博来德滋电子科技有限公司 Dynamic reactive power compensation method of intelligent low-pressure meter reading
CN105703377A (en) * 2016-03-14 2016-06-22 重庆明斯克电气有限责任公司 Dynamic switching control circuit for medium-voltage power capacitor

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Address after: 225300 Phoenix West Road, Jiangsu, Taizhou, No. 2

Patentee after: JIANGSU ELECTRIC POWER COMPANY TAIZHOU POWER SUPPLY Co.

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Address after: 225300 Phoenix West Road, Jiangsu, Taizhou, No. 2

Patentee after: JIANGSU ELECTRIC POWER COMPANY TAIZHOU POWER SUPPLY Co.

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Patentee after: JIANGSU ELECTRIC POWER COMPANY TAIZHOU POWER SUPPLY Co.

Patentee after: TAIZHOU SUYUAN KEDIAN Co.,Ltd.

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Granted publication date: 20070606