CN1320720C - 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 PDFInfo
- Publication number
- CN1320720C CN1320720C CNB2004100147801A CN200410014780A CN1320720C CN 1320720 C CN1320720 C CN 1320720C CN B2004100147801 A CNB2004100147801 A CN B2004100147801A CN 200410014780 A CN200410014780 A CN 200410014780A CN 1320720 C CN1320720 C CN 1320720C
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- capacitor
- switching
- voltage difference
- voltage
- electrical network
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Links
- 239000003990 capacitor Substances 0.000 title claims abstract description 54
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000005259 measurement Methods 0.000 claims description 4
- 230000035939 shock Effects 0.000 abstract 1
- 230000009514 concussion Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000013500 data storage Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
Classifications
-
- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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- Supply And Distribution Of Alternating Current (AREA)
- Control Of Electrical Variables (AREA)
Abstract
The present invention provides a dynamic control method of the switching of a capacitor in low-voltage reactive compensation. When the sum of Ui and deltaU is less than Use and reactive power Qf is more than reactive power Qc, the capacitor is switched on in a power network; when the difference of Ui and deltaU is more than 198 and Qf is less than 0, the capacitor is switched off from the power network. The present invention can dynamically budget threshold values after the capacitor is switched on or off according to the operating conditions of the power network to determine the switching capacity of the capacitor. The capacitor can not generate switching shock, and the safe operation of the power network and devices is ensured.
Description
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 switching front and back, Δ U is U
2Deduct U
1Absolute value;
2) measure the current magnitude of voltage U of electrical network
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 electrical network 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 switching front and back, Δ U is U
2Deduct U
1Absolute value;
2) measure the current magnitude of voltage U of electrical network
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＞198V 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:
The first step: the magnitude of voltage U before and after the Measurement of capacitor switching on the electrical network
1And U
2, calculating the voltage difference delta U of switching front and back, Δ U is U
2Deduct U
1Absolute value;
Second step: measure the current magnitude of voltage U of electrical network
i
The 3rd step: the basis for estimation that capacitor drops into: 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 electrical network 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:
The first step: the magnitude of voltage U before and after the Measurement of capacitor switching on the electrical network
1And U
2, calculating the voltage difference delta U of switching front and back, Δ U is U
2Deduct U
1Absolute value;
Second step: measure the current magnitude of voltage U of electrical network
i
The 3rd step: the 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＞198V and Q
f＜0 o'clock, capacitor is excised from electrical network.
6, the kinetic controlling equation method of capacitor excision 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 excision 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 excision 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.
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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1571237A CN1571237A (en) | 2005-01-26 |
| CN1320720C true CN1320720C (en) | 2007-06-06 |
Family
ID=34478594
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100147801A Expired - Lifetime CN1320720C (en) | 2004-04-29 | 2004-04-29 | Dynamic control method for capacitor switching in low-voltage reactive compensation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1320720C (en) |
Families Citing this family (3)
| 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 |
| 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 |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5610834A (en) * | 1994-04-29 | 1997-03-11 | Michigan State University | 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 |
-
2004
- 2004-04-29 CN CNB2004100147801A patent/CN1320720C/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5610834A (en) * | 1994-04-29 | 1997-03-11 | Michigan State University | 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1571237A (en) | 2005-01-26 |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
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Owner name: STATE GRID CORPORATION OF CHINA Free format text: FORMER OWNER: TAIZHOU POWER SUPPLY CO. OF JIANGSU ELECTRIC POWER CO. Effective date: 20121116 Owner name: JIANGSU ELECTRIC POWER COMPANY TAIZHOU POWER SUPPL Free format text: FORMER OWNER: JIANGSU ANFANG ELECTRIC TECHNOLOGY CO., LTD. Effective date: 20121116 |
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Free format text: CORRECT: ADDRESS; FROM: 225300 TAIZHOU, JIANGSU PROVINCE TO: 100031 XICHENG, BEIJING |
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| CP01 | Change in the name or title of a patent holder |
Address after: 225300 Phoenix West Road, Jiangsu, Taizhou, No. 2 Patentee after: JIANGSU ELECTRIC POWER COMPANY TAIZHOU POWER SUPPLY Co. Patentee after: JIANGSU ANFANG ELECTRIC POWER TECHNOLOGY Co.,Ltd. Address before: 225300 Phoenix West Road, Jiangsu, Taizhou, No. 2 Patentee before: JIANGSU ELECTRIC POWER COMPANY TAIZHOU POWER SUPPLY Co. Patentee before: Taizhou Anfang Electric Technology Co.,Ltd. Address after: 225300 Phoenix West Road, Jiangsu, Taizhou, No. 2 Patentee after: JIANGSU ELECTRIC POWER COMPANY TAIZHOU POWER SUPPLY Co. Patentee after: Taizhou Anfang Electric Technology Co.,Ltd. Address before: 225300 Phoenix West Road, Jiangsu, Taizhou, No. 2 Patentee before: JIANGSU ELECTRIC POWER COMPANY TAIZHOU POWER SUPPLY Co. Patentee before: TAIZHOU SUYUAN KEDIAN Co.,Ltd. Address after: 225300 Phoenix West Road, Jiangsu, Taizhou, No. 2 Patentee after: JIANGSU ELECTRIC POWER COMPANY TAIZHOU POWER SUPPLY Co. Patentee after: TAIZHOU SUYUAN KEDIAN Co.,Ltd. Address before: 225300 Phoenix West Road, Jiangsu, Taizhou, No. 2 Patentee before: JIANGSU ELECTRIC POWER COMPANY TAIZHOU POWER SUPPLY Co. Patentee before: Taizhou Suyuan Group Kedian Co.,Ltd. |
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| TR01 | Transfer of patent right |
Effective date of registration: 20121116 Address after: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Patentee after: State Grid Corporation of China Patentee after: JIANGSU ELECTRIC POWER Co. Patentee after: JIANGSU ELECTRIC POWER COMPANY TAIZHOU POWER SUPPLY Co. Patentee after: JIANGSU ANFANG ELECTRIC POWER TECHNOLOGY Co.,Ltd. Address before: 225300 Phoenix West Road, Jiangsu, Taizhou, No. 2 Patentee before: JIANGSU ELECTRIC POWER COMPANY TAIZHOU POWER SUPPLY Co. Patentee before: JIANGSU ANFANG ELECTRIC POWER TECHNOLOGY Co.,Ltd. |