CN1118914C - Autocontrol system for reactive voltage of local electric power network - Google Patents
Autocontrol system for reactive voltage of local electric power network Download PDFInfo
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- CN1118914C CN1118914C CN00112093A CN00112093A CN1118914C CN 1118914 C CN1118914 C CN 1118914C CN 00112093 A CN00112093 A CN 00112093A CN 00112093 A CN00112093 A CN 00112093A CN 1118914 C CN1118914 C CN 1118914C
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- 230000001105 regulatory effect Effects 0.000 description 10
- 238000005259 measurement Methods 0.000 description 2
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- 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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Abstract
The present invention discloses an automatic control system of the reactive voltage of a local power network, which is mainly composed of a data acquisition part, a central processing part and an operating control part. According to the voltage conditions of the substations of the local power network, the present invention decides to regulate the main transformation tap of the substation or the substation at the upper level. When idle work is not reversely transmitted to a voltage level power network at the upper level, the reverse transmission of the idle work in the power network at the level is permitted, and the flow direction of the idle work is reasonable. Switching oscillation is avoided by estimating capacitance and a voltage value after reactance switching, and multi-main transformation economical operation is carried out. The present invention improves voltage quality, reduces line loss, increases equipment output, and is applied to the automatic control of the reactive voltage of the local power network.
Description
Technical field
The present invention relates to a kind of regional power network reactive voltage autocontrol method.
Background technology
In the present existing technology, the one, adopt the comprehensive control (claiming VQC again) automatically of reactive voltage device, be installed in the electric substation with 10KV electric pressure, regulate sub-connecting switch of transformer gear and switched capacitor according to the variation of 10KV busbar voltage and reactive power, to reach the purpose of regulating the 10KV busbar voltage.The shortcoming of this method is only to rely on the information that the comprehensive automatic control equipment of reactive voltage is installed electric substation, can't consider from the angle of whole regional power network; Another kind method is to depend on ground, the existing supervisory control system in county-level scheduling, send operational order by the person on duty according to each node voltage drift condition, implement and carry adjusting of sub-connecting switch of transformer gear and capacitor switching, reach the purpose of regulating the 10KV busbar voltage.The shortcoming of this method is to carry out in real time that sub-connecting switch of transformer is regulated and the capacitor switching operation, and the operator on duty must observe each node voltage of power network constantly and change, and labour intensity is big, and mistake easily takes place.In addition, more than two kinds of methods all do not solve idle rational flow in the power network, can't realize the purpose of power network line loss minimum.
Summary of the invention
The purpose of this invention is to provide a kind of regional power network reactive voltage autocontrol method, it carries out integrated treatment to each node voltage amount, idle amount, the magnitude of current, proposition is to there being the control command of carrying adjusting of sub-connecting switch of transformer gear and capacitor switching, by means of " four the is distant " function in the existing automated system, automatic control area power network reactive voltage, improve quality of voltage comprehensively, reduce line loss.
For achieving the above object, a kind of regional power network reactive voltage autocontrol method of the present invention mainly comprises:
1) data of each node voltage of collection power network, electric current, reactive power;
2) data of gathering are handled, when substation busbars voltage is higher than the voltage acceptability limit, according to the voltage of power supply with voltage level electric substation and higher level electric substation, decision is turned down this electric substation main transformer shunting switch gear and is still turned down level power supply electric substation main transformer shunting switch gear, do not reach when voltage is qualified to be required the excision capacitor;
When substation busbars voltage is lower than the voltage acceptability limit, drop into capacitor, according to the voltage of power supply, determine that heightening this electric substation main transformer shunting switch gear still heightens level power supply electric substation main transformer shunting switch gear with voltage level electric substation and higher level electric substation; And allow execution to send so that improve magnitude of voltage by reactive power;
3) in the time of in voltage is in acceptability limit, do not sending under the prerequisite of reactive power,, and allowing the execution reactive power to send, switching zone power network electric substations at different levels capacitor according to reactive power rational flow in the power network at the corresponding levels to upper level electric pressure electrical network.
In above-mentioned treatment step, the voltage conditions of capacitor input is U
1+ Δ U≤U
2, Δ U refers to by the capacitor input or cuts out voltage lift-off value or the reduction value that causes, Δ U is by surveying U
1Refer to that capacitor drops into preceding actual value, U
2Refer to the upper voltage limit value.When electric substation's sub-connecting switch of transformer gear transfers to 1 grade, capacitor all cuts out and the single phase transformer operation, when voltage is higher than acceptability limit, drop into reactor, the condition of reactor input is E
2≤ E
1-Δ E, Δ E refer to by the reactor input or cut out the voltage that causes reduce or lift-off value, and Δ E is a measured value, E
1Refer to that reactor drops into preceding actual value, E
2Refer to the lower voltage limit value.
In the voltage acceptability limit, implement voltage and limit operation on the upper side.
Power network two or many main transformers in zone are implemented monotropic or are subtracted the change economical operation, but in service can implements to adjust and reduce a certain transformer mode and move a night.
The sub-connecting switch of transformer gear is regulated number of times and is limited by GB, regulates number of times and can distribute or distribute not according to the period by the period.
Transformer tap gear transfers to 1 grade when electric substation, and capacitor all cuts out, and has implemented the economical operation of many main transformers, and voltage still exceeds standard, and drop into reactor this moment, and the condition of reactor input is E
2≤ E
1-Δ E, Δ E refer to by the reactor input or cut out voltage drop low value or the rising value that causes that Δ E is a measured value, E
1Refer to that reactor drops into preceding actual value, E
2Refer to the lower voltage limit value.
Software realization mode is that for each electric substation sets up tables of data, the cyclic search tables of data is analyzed proposition operation or change tables of data according to tables of data then.
Because this system has carried out the collection and the analysis of each node voltage value in the regional power network, reduce significantly thereby make the sub-connecting switch of transformer gear regulate number of times, rate of qualified voltage increases substantially.
Because this system has carried out the collection and the analysis of each node reactive power in the regional power network, do not sending under the idle prerequisite to upper level electric pressure electrical network, realize idle rational flow in the power network at the corresponding levels, line loss rate is tending towards in the minimum zone, allows and has realized that reactive power send.
Owing to adopt the actual measurement mode to obtain the voltage difference that causes after capacitor, the reactor input, make capacitor, reactor before dropping into, can carry out the whether out-of-limit budget of magnitude of voltage after capacitor, reactor drop into, avoided capacitor, reactor throw in-of oscillation.
Because during not segmentation of bus, no matter whether main transformer stops using, shunting switch gear number is adjusted consistent, make when needs recover the stoppage in transit main transformer, no longer need manual intervention to adjust sub-connecting switch of transformer gear unanimity, when bus section, gear is adjusted number and is not required unanimity.
Implement the economical operation of many main transformers owing to adopt, reduce line loss on the one hand; Line voltage is last more in limited time on the other hand, becomes operation owing to subtract, and has clamped down on the rising of voltage, has improved rate of qualified voltage.
Description of drawings
The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
Fig. 1 is a kind of autocontrol system for reactive voltage of local electric power network flow chart of the present invention;
Fig. 2 is a kind of regional power network schematic diagram of the present invention;
Embodiment
Fig. 1 describes the autocontrol system for reactive voltage of local electric power network flow chart, at first from the dispatch automated system image data, send into the voltage analysis module and idle analysis module carries out analysis-by-synthesis, form electric substation's main transformer shunting switch regulating command, electric substation's capacitor switching instruction, many main transformers economical operation instruction, transfer to control centre, centralized control center, the execution of auxiliary tone central control system, after this move in circles.
Describe in a kind of regional power network at Fig. 2, suppose that reactive power is reasonably flowing in the scope voltage adjusting method: peer and the super simultaneously upper limit of electric substation of subordinate 10 kilovoltages or super lower limit, then transfer upper level electric substation main transformer tap gear; The single super upper limit of electric substation's 10 kilovoltages or super lower limit are then only regulated this electric substation main transformer shunting switch gear.If only 10 kilovolts of super upper limits of busbar voltage of 1 electric substation or super lower limit are then only regulated 1 electric substation's main transformer tap gear; If the super simultaneously upper limit of 10 kilovolts of busbar voltages of 1,2,3 electric substations or super lower limit are then regulated 3 electric substation's main transformer shunting switch gears; If the super simultaneously upper limit of 10 kilovolts of busbar voltages of 1,2,3,4,5,6 electric substations or super lower limit are then regulated 7 electric substation's main transformer tap gears.
Describe in a kind of regional power network at Fig. 2, suppose that voltage is in acceptability limit, the reactive power method of adjustment: 5 electric substations add the half (specifically greatly to what can set) of this electric substation's main transformer zero load reactive power greater than 10 kilovolts of condenser capacities of this electric substation when flowing through the load or burden without work that D order, if 7 B of electric substation point reactive power flows do not take place to send to 220 kv grids after this capacitor input, 10 kilovolts of capacitors of this electric substation this moment can drop into.1,10 kilovolts of capacitors of 2,3 electric substations condition that drops into drops into condition with 10 kilovolts of capacitors of 5 electric substations, but require 3 A of electric substation point reactive power flows not take place to send to 110 kv grids, realize the layering reactive balance, also can set and require 7 B of electric substation point reactive power flows not take place to send to 220 kv grids.
Describe in a kind of regional power network at Fig. 2,1 electric substation's main transformer shunting switch gear is regulated and capacitor switching Comprehensive Control scheme: when 10 kilovolts of super last prescribing a time limit of busbar voltage, turn down main transformer tap gear earlier, still super last the prescribing a time limit of voltage cut capacitor again; When 10 kilovolts of super following prescribing a time limit of busbar voltage, throw capacitor earlier, still super following the prescribing a time limit of voltage increases main transformer shunting switch gear again.
Describe in a kind of regional power network at Fig. 2, suppose that 1 electric substation's main transformer shunting switch gear is modulated to 1 grade, 3,7 electric substation's main transformer tap gears are modulated to low as far as possible, 1 electric substation's capacitor is not thrown, 10 kilovolts of busbar voltages of 1 electric substation this moment are 10.5 kilovolts, according to 1 electric substation's load or burden without work situation, need to drop into 10 kilovolts of capacitors of 1 electric substation now.Can 10 kilovolts of capacitors of 1 electric substation drop into so, whether 10 kilovolts of bus voltage value of 1 electric substation are above 10.7 kilovolts after will seeing this capacitor input, promptly is the busbar voltage that improves after this capacitor input greater than 0.2 kilovolt? if greater than 0.2 kilovolt, then can not throw, otherwise can throw.If the magnitude of voltage that improves after the estimation capacitor input has been estimated greatly, cause this throwing and not throwing; Estimate for a short time, cause throw in-of oscillation, promptly after the capacitor input because voltage exceeds standard, must excise capacitor immediately again, after the excision, drop into capacitor again because voltage exceeds standard, excise capacitor again, so move in circles.Obviously know in advance that the magnitude of voltage that can improve after capacitor drops into is most important, the present invention has correctly grasped this magnitude of voltage by actual measurement, has avoided the capacitor switching vibration.
Describe in a kind of regional power network at Fig. 2,4 electric substations include two main transformers, if the shunting switch gear of two main transformers is modulated to 1 retaining, higher level electric substation main transformer shunting switch gear is modulated to as far as possible little, 4 electric substation's capacitors also excise, 10 kilovolts of busbar voltages of 4 electric substations this moment are still above 10.7 kilovolts, if this moment, the 2# main transformer can be born whole loads, 1# main transformer isolated operation electric energy loss is bigger than the isolated operation of 2# main transformer, then excise the 1# main transformer, stay the operation of 2# main transformer and no longer be replaced by the operation of 1# main transformer, so just reduced by 10 kilovolts of busbar voltages of 4 electric substations, prevented the transformer frequent switching again.The present invention also can control by two (many) main transformer economical operation theories of standard.
Claims (3)
1, a kind of regional power network reactive voltage autocontrol method is characterized in that this method comprises the following steps:
1) gathers each node voltage of power network, electric current, reactive power data;
2) data of gathering are handled, when substation busbars voltage is higher than the voltage acceptability limit, according to the voltage of power supply with voltage level electric substation and higher level electric substation, decision is turned down this electric substation main transformer shunting switch gear and is still turned down level power supply electric substation main transformer shunting switch gear, do not reach when voltage is qualified to be required the excision capacitor;
When substation busbars voltage is lower than the voltage acceptability limit, drop into capacitor, according to the voltage of power supply with voltage level electric substation and higher level electric substation, decision is heightened this electric substation main transformer shunting switch gear and is still heightened level power supply electric substation main transformer shunting switch gear, and allows execution to send so that improve magnitude of voltage by reactive power;
3) in the time of in voltage is in acceptability limit, do not sending under the prerequisite of reactive power,, and allowing the execution reactive power to send, switching zone power network electric substations at different levels capacitor according to reactive power rational flow in the power network at the corresponding levels to upper level electric pressure electrical network.
2, control method according to claim 1 is characterized in that in described treatment step the voltage conditions of capacitor input is U
1+ Δ U≤U
2, Δ U refers to by the capacitor input or cuts out voltage lift-off value or the reduction value that causes, Δ U is by surveying U
1Refer to that capacitor drops into preceding actual value, U
2Refer to the upper voltage limit value.
3, control method according to claim 1, it is characterized in that in described treatment step, when electric substation's sub-connecting switch of transformer gear transfers to 1 grade, capacitor all cuts out and single phase transformer operation, when voltage is higher than acceptability limit, drop into reactor, the condition of reactor input is E
2≤ E
1-Δ E, Δ E refer to by the reactor input or cut out the voltage that causes reduce or lift-off value, and Δ E is a measured value, E
1Refer to that reactor drops into preceding actual value, E
2Refer to the lower voltage limit value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN00112093A CN1118914C (en) | 2000-02-25 | 2000-02-25 | Autocontrol system for reactive voltage of local electric power network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN00112093A CN1118914C (en) | 2000-02-25 | 2000-02-25 | Autocontrol system for reactive voltage of local electric power network |
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| Publication Number | Publication Date |
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| CN1271985A CN1271985A (en) | 2000-11-01 |
| CN1118914C true CN1118914C (en) | 2003-08-20 |
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| CN00112093A Expired - Lifetime CN1118914C (en) | 2000-02-25 | 2000-02-25 | Autocontrol system for reactive voltage of local electric power network |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1320720C (en) * | 2004-04-29 | 2007-06-06 | 江苏省电力公司泰州供电公司 | Dynamic control method for capacitor switching in low-voltage reactive compensation |
| CN1327587C (en) * | 2005-09-02 | 2007-07-18 | 清华大学 | Voltage control method based on soft partitions in power system |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101728833B (en) * | 2008-10-16 | 2012-01-11 | 上海思南电力通信有限公司 | Reactive power compensation method for low-voltage distribution line |
| CN105896522A (en) * | 2014-12-17 | 2016-08-24 | 国家电网公司 | Transformer economical operation control method, device and system |
| CN104578109A (en) * | 2015-01-14 | 2015-04-29 | 国家电网公司 | Voltage reactive power control method based on improved nine-zone diagram |
-
2000
- 2000-02-25 CN CN00112093A patent/CN1118914C/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1320720C (en) * | 2004-04-29 | 2007-06-06 | 江苏省电力公司泰州供电公司 | Dynamic control method for capacitor switching in low-voltage reactive compensation |
| CN1327587C (en) * | 2005-09-02 | 2007-07-18 | 清华大学 | Voltage control method based on soft partitions in power system |
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| Publication number | Publication date |
|---|---|
| CN1271985A (en) | 2000-11-01 |
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Owner name: STATE ELECTRIC NET CROP. Free format text: FORMER OWNER: TAIZHOU ELECTRIC POWER SUPPLY BUREAU Effective date: 20130217 Owner name: JIANGSU ELECTRIC POWER COMPANY TAIZHOU ELECTRIC PO Free format text: FORMER OWNER: DING XIAOQUN Effective date: 20130217 |
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Effective date of registration: 20130217 Address after: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Patentee after: State Grid Corporation of China Patentee after: Jiangsu Electric Power Company Patentee after: Taizhou Electric Power Supply Bureau Patentee after: Ding Xiaoqun Address before: 225300 No. 588 South Jiangzhou Road, Hailing District, Jiangsu, Taizhou Patentee before: Taizhou Electric Power Supply Bureau Patentee before: Ding Xiaoqun |
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