CN110707709B - Method for adjusting AVC (automatic Voltage control) linkage of variable voltage and main station for 500kV power station - Google Patents
Method for adjusting AVC (automatic Voltage control) linkage of variable voltage and main station for 500kV power station Download PDFInfo
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- CN110707709B CN110707709B CN201911044023.1A CN201911044023A CN110707709B CN 110707709 B CN110707709 B CN 110707709B CN 201911044023 A CN201911044023 A CN 201911044023A CN 110707709 B CN110707709 B CN 110707709B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
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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
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- 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 invention relates to the technical field of automatic control, in particular to a method for adjusting the AVC (automatic Voltage control) linkage of a variable voltage and a main station for a 500kV power station, which comprises the following steps: s10: setting a station AVC (automatic Voltage control) variable voltage regulation station; s20: setting a station AVC (automatic Voltage control) variable voltage regulation station fixed value; s30: and updating the dynamic state of the low-voltage change quantity, automatically regulating the voltage of the station transformer AVC, and avoiding the situation that the voltage is too high or too low frequently in the automatic control process.
Description
Technical Field
The invention relates to the technical field of automatic control, in particular to a method for adjusting the variable voltage and the main station AVC in a linkage manner for a 500kV power station.
Background
At present, the power grid of our province generally adopts the AVC function of the dispatching automation master station to automatically control the voltage and the reactive power of the transformer substation, so that the real-time control capability of the power grid is greatly improved, and the working efficiency of dispatching monitoring personnel is improved.
However, the influence on the low-voltage for the substation is not considered in the strategy of the AVC, and the 380V voltage for the substation is too high or too low in the automatic control of the AVC, so that the operation of the substation internal sub-equipment is seriously influenced, and the risk is brought to the safe operation of the power grid. Especially for the transformer substation of 500kV and above, because the low-voltage side voltage of the transformer substation is often not taken as the main control target of AVC control, the situation of over-high voltage or over-low voltage often occurs in the automatic control process.
The automatic control strategy of the AVC of the current 500kV transformer substation has the following key technical problems:
(1) The voltage of the 35kV side is not taken as the main control target of AVC control;
(2) The switching on and off of the capacitor reactor group has little influence on the voltage of a 500kV high-voltage side and has great influence on the voltage of a 35kV low-voltage side;
(3) The station transformer of a part of 500kV transformer substations does not have the on-load voltage regulation function;
(4) The power supply of the substation internal sub-equipment is directly provided by the substation with the variable 380V voltage, and is greatly influenced by the power supply.
The above problems cause the following drawbacks: the use of variable 380V at a station often results in either too high or too low a voltage. The equipment in the station directly powered by the station transformer can generate an alarm and even be damaged.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method for linkage regulation of the station-used variable voltage of a 500kV power station and the AVC of a main station, which is used for automatically regulating the voltage of the station-used variable AVC and avoiding the situation that the voltage is too high or too low frequently in the automatic control process.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a method for adjusting the linkage of a variable voltage and a main station AVC for a 500kV power station comprises the following steps:
s10: the station is set with changing AVC pressure regulating station: the method is characterized by comprising the following steps of (1) independently setting an AVC module of a master station according to an AVC mode of a transformer substation, and setting the AVC module of the master station by taking the transformer substation as a unit;
s20: the setting station uses the AVC voltage regulation station setting value: setting the upper and lower limit values U of A, B and C three-phase voltages a on 、U b on 、U c on And U a is under 、U b is below 、U c is under ；
S30: updating the low voltage change amount dynamics: OCS system respectively automatic calculationAverage change quantity delta U of A, B and C three-phase voltages of each capacitor bank and reactor switching pair Container a 、△U Container b 、△U C container And delta U Anti-a 、△U Anti b 、△U Anti c A value;
s40: gear shifting for the pre-adjusting station: calculating predicted values of the voltages of each phase on the low-voltage side for the station to exit according to the low-voltage values Ua, ub and Uc for the current station and a capacitor reactor bank switching command required to be executed in a strategy; if the calculation result exceeds the upper and lower limit ranges of the corresponding phase, reverse gear shifting needs to be performed within the upper and lower limit ranges. If the predicted value is within the upper and lower limit ranges, the operation is not performed. The step can ensure that the low voltage for the station does not have the out-of-limit condition in a short time;
the specific steps in step S40 are:
s401: judging whether the AVC of the transformer substation has the switching capacitor reactor group strategy generation, if so, entering a step S402, otherwise, entering a step S406;
s402: judging whether to throw the capacitor bank or the reactor bank, if so, proceeding to step S403,
if not, entering step S404;
s403: judging whether U is satisfied a on <U a +△U Container a Or U b is on <U b +△U Container b Or U c on <U C +△U C container Or U a on <U a +△U Anti a Or U b is on <U b +△U Anti b Or U c on <U C +△U Anti c If yes, lowering the substation transformer voltage gear 1 by the substation transformer AVC, repeating the step S403, and if not, returning to the step S401;
s404: the capacitor bank is removed or the reactor bank is put into operation, and the process goes to step 405;
s405: judging whether U is satisfied a is under ＞U a -△U Container a Or U b is under ＞U b -△U Container b Or U c is under ＞U C -△U C container Or U a is under ＞U a -△U Anti-a Or U b is below ＞U b -△U Anti b Or U c is under ＞U C -△U Anti c If yes, lowering the substation voltage gear 1 by the substation AVC transformer, repeating the step S405, and if not, returning to the step S401; s406: and judging whether the substation voltage is out of limit, if so, reversely transferring the substation voltage gear 1 gear by the substation AVC transformer, repeating the step S406, and if not, returning to the step S401.
Further, in step S10, for a substation with multiple substation transformers, voltage regulation strategies of the substation transformers in different operation modes need to be considered, and the operation modes are divided into a split mode and a parallel mode.
Furthermore, the split mode is that the low-voltage side for the station is not interconnected with other stations and operates independently.
Furthermore, the parallel mode is that a plurality of stations are interconnected and operated by low voltage-reducing sides.
Further, in step S20, the upper and lower limit values U of the three-phase voltages a, B, and C are set a on 、U b is on 、U c on And U a is under 、U b is under 、U c is under And the maximum value and the minimum value of the minimum variation range allowed by the equipment for directly supplying power by the substation-in substation according to the substation are used as the upper limit value and the lower limit value.
Further, in step S30, the OCS system automatically calculates average change Δ U of three-phase voltages a, B, and C of each capacitor bank and each reactor switching pair according to the influence of the 380V-side voltage of the transformer substation switching capacitor-reactor switching pair in several days each day Container a 、△U Container b 、△U C container And. DELTA.U Anti-a 、△U Anti b 、△U Anti c The value is obtained.
Further, the OCS system automatically calculates the influence amplitude of the 380V side voltage of the transformer substation switching capacitor-reactor set every 30 days.
Furthermore, linkage regulation needs to meet the requirement that a transformer for each station of the transformer substation needs to be configured with an on-load tap changer, 380V side voltage of the transformer for each station of the transformer substation, on-load tap changer gear position information and a switch gear remote control point are collected and sent to a master station system, and the master station has a transformer and voltage regulation function for stations in the transformer substation.
Compared with the prior art, the invention has the beneficial effects that:
by the method, the AVC of the substation transformer can be automatically regulated, and the situation that the low-voltage side voltage of the substation transformer is too high or too low in the automatic control process of the AVC of the substation is avoided.
Drawings
Fig. 1 is a schematic diagram of a specific flow in step S40 of the present invention.
Detailed Description
The present invention will be further described with reference to the following embodiments. Wherein the drawings are for illustration only
The drawings are diagrammatic and not pictorial in nature and are not to be construed as limiting the present patent; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of the description, but it is not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation and operate, and therefore the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limiting the present patent, and it is possible for one of ordinary skill in the art to understand the specific meaning of the above terms according to the specific situation.
Examples
A method for adjusting the voltage transformation and master station AVC linkage for a 500kV power station firstly needs to meet the following condition requirements:
1. each station of the transformer substation needs to be configured with an on-load tap changer;
2. collecting 380V side voltage of each station of the transformer substation, gear position information of an on-load tap changer and remote control points of switch gears and sending the voltage, the gear position information and the remote control points to a master station system; the master station has the function of voltage regulation for the station in the transformer substation.
The method comprises the following steps:
s10: the station is set with changing AVC pressure regulating station: the method is characterized by comprising the following steps of (1) independently setting an AVC module of a master station according to an AVC mode of a transformer substation, and setting the AVC module of the master station by taking the transformer substation as a unit;
s20: the setting station uses the AVC voltage regulation station setting value: setting the upper and lower limit values U of A, B and C three-phase voltages a on 、U b on 、U c on And U a is under 、U b is below 、U c is under ；
S30: updating the low voltage change amount dynamics: the OCS system respectively and automatically calculates the average change quantity delta U of the A, B and C three-phase voltages of each capacitor bank and reactor on-off pair Container a 、△U Container b 、△U C container And delta U Anti a 、△U Anti b 、△U Anti-c A value;
s40: gear shifting for the pre-adjusting station: calculating a predicted value of each phase voltage at the low-voltage side for the station according to the low-voltage values Ua, ub and Uc for the current station and a capacitor reactor group switching command which needs to be executed in a strategy; if the calculation result exceeds the upper and lower limit ranges of the corresponding phase, reverse gear shifting needs to be performed within the upper and lower limit ranges. If the predicted value is within the upper and lower limit ranges, the operation is not carried out.
In this embodiment, in step S10, voltage regulation strategies of the substation with multiple substation transformers under different operation modes need to be considered, and the operation modes are classified into a split mode and a parallel mode.
The low voltage side for the station is not connected with the transformer for other stations in a split-column mode and operates independently. The parallel mode is that a plurality of stations are interconnected and operated by a low-voltage side.
In this embodiment, in step S20, the upper and lower limit values U of the three-phase voltages a, B, and C are set a on 、 U b on 、U c on And U a is under 、U b is below 、U c is under The maximum value and the minimum value of the minimum variation range allowed by the equipment directly powered by the substation-in substation according to the substation are used as the upper limit value and the lower limit value.
In the bookIn an embodiment, in step S30, the OCS system automatically calculates average change Δ U of three-phase voltages a, B, and C of each capacitor bank and each reactor on-off pair according to the influence of the 380V-side voltage of the transformer substation on-off capacitor-reactor pair in 30 days Container a 、△U Container b 、△U C container And delta U Anti-a 、△U Anti b 、△U Anti-c The value is obtained.
In this embodiment, the specific steps in step S40 are:
s401: judging whether the AVC of the transformer substation has the switching capacitor reactor group strategy generation, if so, entering a step S402, otherwise, entering a step S406;
s402: judging whether a capacitor bank or a reactor bank is to be put into operation, if so, entering a step S403, otherwise, entering a step S404;
s403: judging whether U is satisfied a on <U a +△U Container a Or U b on <U b +△U Container b Or U c on <U C +△U C container Or U a on <U a +△U Anti-a Or U b on <U b +△U Anti b Or U c on <U C +△U Anti-c If yes, lowering the substation voltage gear 1 by the substation AVC transformer, repeating the step S403, and if not, returning to the step S401;
s404: the capacitor bank is removed or the reactor bank is switched on, and the process goes to step 405;
s405: judging whether U is satisfied a is under ＞U a -△U Container a Or U b is below ＞U b -△U Container b Or U c is under ＞U C -△U C container Or U a is under ＞U a -△U Anti-a Or U b is below ＞U b -△U Anti b Or U c is under ＞U C -△U Anti-c If yes, lowering the substation transformer voltage gear 1 by the substation transformer AVC, repeating the step S405, and if not, returning to the step S401;
s406: and judging whether the station transformer voltage exceeds the limit, if so, switching the station transformer AVC to reverse the station transformer voltage gear 1, repeating the step S406, and if not, returning to the step S401.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (8)
1. A method for adjusting the linkage of a variable voltage and a main station AVC for a 500kV power station is characterized by comprising the following steps:
s10: the AVC-variable voltage regulating station for the setting station comprises: the method is characterized by comprising the following steps of (1) independently setting an AVC module of a master station according to an AVC mode of a transformer substation, and setting the AVC module of the master station by taking the transformer substation as a unit;
s20: the setting station uses the AVC voltage regulation station setting value: setting the upper and lower limit values U of A, B and C three-phase voltages a on 、U b on 、U c on And U a is under 、U b is below 、U c is under ；
S30: updating the low voltage change amount dynamics: the OCS system respectively and automatically calculates the average change quantity delta U of the A, B and C three-phase voltages of each capacitor bank and reactor on-off pair Container a 、△U Container b 、△U C container And delta U Anti-a 、△U Anti b 、△U Anti c A value;
s40: gear shifting for the pre-adjusting station: calculating a predicted value of each phase voltage at the low-voltage side for the station according to the low-voltage values Ua, ub and Uc for the current station and a capacitor reactor group switching command which needs to be executed in a strategy; if the calculation result exceeds the upper and lower limit ranges of the corresponding phase, reverse gear shifting needs to be carried out in the upper and lower limit ranges, and if the predicted value is in the upper and lower limit ranges, the operation is not carried out;
the specific steps in step S40 are:
s401: judging whether the AVC of the transformer substation has the policy generation of the switching capacitor reactor group, if so, entering a step S402, and if not, entering a step S406;
s402: judging whether a capacitor bank or a reactor bank is to be switched, if so, entering step S403, otherwise, entering step S404;
s403: judging whether U is satisfied a on <U a +△U Container a Or U b on <U b +△U Container b Or U c on <U C +△U C container Or U a on <U a +△U Anti a Or U b on <U b +△U Anti b Or U c on <U C +△U Anti-c If yes, lowering the substation voltage gear 1 by the substation AVC transformer, repeating the step S403, and if not, returning to the step S401;
s404: the capacitor bank is removed or the reactor bank is switched on, and the process goes to step 405;
s405: judging whether U is satisfied a is under ＞U a -△U Container a Or U b is under ＞U b -△U Container b Or U c is under ＞U C -△U C container Or U a is under ＞U a -△U Anti-a Or U b is below ＞U b -△U Anti b Or U c is under ＞U C -△U Anti c If yes, lowering the substation voltage gear 1 by the substation AVC transformer, repeating the step S405, and if not, returning to the step S401;
s406: and judging whether the station transformer voltage exceeds the limit, if so, switching the station transformer AVC to reverse the station transformer voltage gear 1, repeating the step S406, and if not, returning to the step S401.
2. The method for adjusting the voltage of the 500kV substation transformer substation in linkage with the AVC of the main station as claimed in claim 1, wherein in step S10, for the substation with a plurality of substation transformers, voltage adjustment strategies of the substation transformers in different operation modes need to be considered, and the operation modes are divided into a split-column mode and a parallel mode.
3. The method of claim 2, wherein the AVC (automatic Voltage control) of the 500kV power station is performed in a split-column mode by enabling low-voltage sides of the stations to operate independently.
4. The method as claimed in claim 2, wherein the parallel mode is that a plurality of stations are interconnected to run by the low-voltage side.
5. The method of claim 1, wherein in step S20, the upper and lower limit values U of the a, B, C three-phase voltages are set a on 、U b on 、U c on And U a is under 、U b is below 、U c is under And the maximum value and the minimum value of the minimum variation range allowed by the equipment for directly supplying power by the substation-in substation according to the substation are used as the upper limit value and the lower limit value.
6. The method for the coordinated regulation of the variable voltage and the AVC of the main station for the 500kV power station according to the claim 1, wherein in the step S30, the OCS system respectively and automatically calculates the average change quantity DeltaU of the three-phase voltages of A, B and C of each capacitor group and the reactor on/off pair according to the influence range of the 380V side voltage of the transformer substation on/off capacitor and reactor group in several days Container a 、△U Container b 、△U C container And. DELTA.U Anti-a 、△U Anti b 、△U Anti c The value is obtained.
7. The method for the coordinated regulation of the variable voltage and the AVC of the main station for the 500kV power station according to claim 6, wherein the OCS system automatically calculates the influence amplitude of the 380V side voltage of the transformer substation switching capacitor-reactor set according to the day of 30 days.
8. The method for the linkage regulation of the variable voltage for the 500kV power station and the AVC of the master station according to any one of claims 1 to 7, characterized in that the linkage regulation needs to meet the requirement that each station transformer of the transformer substation needs to be provided with an on-load tap changer, 380V side voltage of each station transformer of the transformer substation, gear position information of the on-load tap changer and a remote control point of a switch gear are collected and sent to a master station system, and the master station has the function of voltage regulation of the transformer substation.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102427234A (en) * | 2011-12-20 | 2012-04-25 | 东方电子股份有限公司 | AVC (Automatic Voltage Control) joint-debugging control method based on var compensation technology |
| CN104300538A (en) * | 2014-10-28 | 2015-01-21 | 广东电网有限责任公司电力调度控制中心 | Coordinated constraint limiting value updating method and system in factory station coordination automatic voltage control |
| CN105811425A (en) * | 2014-12-31 | 2016-07-27 | 国家电网公司 | Dynamic reactive power compensation device control method |
| CN108964064A (en) * | 2018-07-10 | 2018-12-07 | 广东电网有限责任公司 | A kind of method of the unilateral locking AVC control strategy of the side 500kV substation 35kV voltage |
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2019
- 2019-10-30 CN CN201911044023.1A patent/CN110707709B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102427234A (en) * | 2011-12-20 | 2012-04-25 | 东方电子股份有限公司 | AVC (Automatic Voltage Control) joint-debugging control method based on var compensation technology |
| CN104300538A (en) * | 2014-10-28 | 2015-01-21 | 广东电网有限责任公司电力调度控制中心 | Coordinated constraint limiting value updating method and system in factory station coordination automatic voltage control |
| CN105811425A (en) * | 2014-12-31 | 2016-07-27 | 国家电网公司 | Dynamic reactive power compensation device control method |
| CN108964064A (en) * | 2018-07-10 | 2018-12-07 | 广东电网有限责任公司 | A kind of method of the unilateral locking AVC control strategy of the side 500kV substation 35kV voltage |
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