CN110311602B - Low excitation limit optimization setting method and system for excitation regulator - Google Patents
Low excitation limit optimization setting method and system for excitation regulator Download PDFInfo
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- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
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- H02H7/065—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric generators; for synchronous capacitors against excitation faults
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- H—ELECTRICITY
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Abstract
The invention discloses a low excitation limit optimization setting method and system of an excitation regulator, wherein a phase advance capability value of a generator set under different active working conditions is obtained through a phase advance test of the generator set; obtaining a calculation formula of low excitation limiting action characteristics according to the manufacturer and the model of the excitation regulator, calculating a low excitation limiting action value, reducing the reactive power of the unit until the low excitation limiting action is reached, adjusting the calculation formula to recalculate the low excitation limiting action value if the deviation of the calculated low excitation limiting action value and the actual low excitation limiting action value exceeds a set range until the deviation is in the set range, and setting a low excitation limiting fixed value by the calculated low excitation limiting action value equal to or approaching the unit phase-feed capacity value; and after the low excitation limiting fixed value is set, fine-tuning the set low excitation limiting fixed value through a unit phase advance test until the error between the actual low excitation limiting action value and the phase advance capacity value is within an allowable range. The invention can ensure the unit to safely operate in the phase advancing capacity.
Description
Technical Field
The invention relates to the technical field of source network coordination, in particular to a low excitation limit optimization setting method and system for an excitation regulator.
Background
The low excitation limit is also called under excitation limit, is an important auxiliary link of the excitation regulator, and mainly has the function of preventing the generator from instability caused by too deep phase advance or demagnetization caused by too low excitation level. If the low excitation limit is not reasonably set, the magnetic loss protection malfunction can be caused or the exertion of the unit phase advancing capability can be limited, and the characteristics of a Power System Stabilizer (PSS) are also interfered, so that the System stability is adversely affected.
The principle of the prior low excitation limiting setting is that the low excitation limiting action curve is determined according to different active power static stability limits and heating conditions of the generator, and the low excitation limiting action curve is matched with the demagnetization protection. However, the low excitation limit is basically consistent with the principle of rounding the static stability limit in the demagnetization protection, and the low excitation limit fixed value and the demagnetization protection fixed value determined according to the same principle cannot ensure the low excitation limit to perform early demagnetization protection action; when the reactive power drop approaches to the low excitation limit or the demagnetization protection action curve, the reduction of the terminal voltage is necessarily accompanied, the terminal voltage is reduced, so that the actual action values of the low excitation limit and the demagnetization protection are both advanced from the actual fixed value, the change amplitudes of the low excitation limit and the demagnetization protection are different along with the reduction of the terminal voltage, and the low excitation limit fixed value is only set above the demagnetization protection fixed value, so that the low excitation limit is not ensured to precede the demagnetization protection action in the actual operation of the unit.
2016 industry Standard DL/T1523 and 2016 Generator set phase advance test guide proposes that the low excitation limit setting is part of the phase advance test, and the low excitation limit should be set within the range of the actually measured phase advance capability. The actual measured phase advance capability comprehensively considers the conditions of the generator static stability limit, the field loss protection, the temperature rise, the service voltage and the like in the phase advance test of the generator set, so that the safe operation of the generator set can be ensured within the range of the phase advance capability of the generator set. The low excitation limiting fixed value is set within the phase advance capability range, so that the unit can act before reaching the phase advance capability of the unit, the unit is prevented from running to an unsafe area outside the phase advance capability, and the phase advance operation safety of the unit is ensured. However, in the low excitation limiting setting principle, due to factors such as terminal voltage drop and the like, the low excitation limiting is advanced to the setting value to act, so that the unit cannot fully exert the due phase-advancing capability of the unit, the absorption of excessive reactive power of the power grid during low load of the power grid is not facilitated, even the voltage is caused to run beyond the upper limit, and adverse effects are brought to the safe operation of the power grid.
Through the above description, one of the two current low excitation limit setting methods is through static stability limit setting, and because the low excitation limit action value and the setting value have deviation and the demagnetization protection action value and the setting value also have deviation, the low excitation limit setting method is not easily and reasonably matched with the demagnetization protection method; and the other method is set within the actually measured phase advance capability range, the method is relatively conservative, is not beneficial to the full exertion of the phase advance capability of the unit, and a more reasonable setting method is provided for the practical situation of low excitation limit in the operation of the unit.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides the low excitation limit optimization setting method of the excitation regulator, which can not only avoid the problem of difficult matching with the field loss protection, but also give full play to the phase advance capability of the unit and has good application prospect.
In order to achieve the above purpose, the invention adopts the following technical scheme: a low excitation limit optimization setting method of an excitation regulator is characterized by comprising the following steps: the method comprises the following steps:
step one, comparing whether the deviation between the low excitation limiting actual action value of the excitation regulator and the calculated low excitation limiting action value obtained when the reactive power of the generator set is reduced until the low excitation limiting action of the excitation regulator exceeds a set range or not is compared, if the deviation exceeds the set range, adjusting a low excitation limiting action value calculation formula, re-comparing the deviation until the deviation is within the set range to obtain a final low excitation limiting action value calculation formula, and setting a low excitation limiting fixed value according to the final low excitation limiting action value calculation formula and the calculated low excitation limiting action value to be equal to or approximate to a set phase advance capacity value; the calculated low excitation limiting action value is calculated according to a calculation formula of low excitation limiting action characteristics;
and step two, after the low excitation limiting fixed value is set, the set low excitation limiting fixed value is fine-tuned through a generator set phase advance test again until the error between the actual low excitation limiting action value and the phase advance capacity value is within an allowable range.
The low excitation limit optimization setting method of the excitation regulator is characterized by comprising the following steps of: the phase advance capability value is as follows: and when the phase enters, the reactive power of the unit is reduced until any parameter of the limiting factors of the generator reaches the reactive power value of the limit value.
The low excitation limit optimization setting method of the excitation regulator is characterized by comprising the following steps of: the limiting factors of the generator comprise generator terminal voltage, a static stability limit, generator terminal current, temperature, service voltage and system voltage of the generator.
The low excitation limit optimization setting method of the excitation regulator is characterized by comprising the following steps of: the specific process of the step one is as follows:
(1) obtaining a calculation formula of low excitation limiting action characteristics according to the manufacturer and the model of the excitation regulator;
(2) setting a low excitation limiting fixed value at a phase-feed capacity value, calculating a low excitation limiting action value through a calculation formula, slowly reducing the reactive power of a test unit to be close to the calculated low excitation limiting action value, verifying whether the low excitation limiting action value acts correctly, raising the low excitation limiting setting value if the reactive power value does not act before the phase-feed capacity value, reducing the reactive power of the unit again until the low excitation limiting action value, and if the deviation between the actual low excitation limiting action value and the calculated low excitation limiting action value exceeds a set range, superposing a fixed reactive power offset value on a low excitation limiting action characteristic formula of an excitation regulator for adjustment until the error between the calculated low excitation limiting action value and the actual low excitation limiting action value is within the set range to obtain a final calculation formula;
(3) and setting the calculated action value of the low excitation limit as a unit phase advancing capacity value or approaching the unit phase advancing capacity value as much as possible, and calculating the fixed value of the low excitation limit according to a final calculation formula.
The low excitation limit optimization setting method of the excitation regulator is characterized by comprising the following steps of: the second step comprises the following specific processes: and after the low excitation limiting fixed value is set, slowly reducing the idle work of the unit under the fixed value until the low excitation limiting action, if the low excitation limiting does not act in the process or acts more in advance, fine-adjusting the low excitation limiting fixed value again until the actual action value of the low excitation limiting is close to the phase advance capacity value of the unit.
The low excitation limit optimization setting method of the excitation regulator is characterized by comprising the following steps of: and in the reactive power reduction process of the unit, the minimum reactive power of the unit does not exceed the phase advance capability of the unit.
A low excitation limit optimization setting system of an excitation regulator is characterized by comprising the following components:
the setting low excitation limiting fixed value module is used for comparing whether the deviation between the actual low excitation limiting action value of the excitation regulator obtained when the reactive power of the generator set is reduced until the low excitation limiting action of the excitation regulator exceeds a set range or not, if so, adjusting a low excitation limiting action value calculation formula, re-comparing the deviation until the deviation is within the set range to obtain a final low excitation limiting action value calculation formula, and according to the final low excitation limiting action value calculation formula, setting the low excitation limiting fixed value by the calculated low excitation limiting action value to be equal to or approximate to the set phase feeding capacity setting low excitation limiting fixed value; the calculated low excitation limiting action value is calculated according to a calculation formula of low excitation limiting action characteristics;
and the fine-tuning set low excitation limiting fixed value module is used for fine-tuning the set low excitation limiting fixed value through a generator set phase advance test until the error between the actual low excitation limiting action value and the phase advance capacity value is within an allowable range.
The excitation regulator low excitation limit optimizing and setting system is characterized in that the specific process of setting the low excitation limit fixed value is as follows:
(1) obtaining a calculation formula of low excitation limiting action characteristics according to the manufacturer and the model of the excitation regulator;
(2) setting a low excitation limiting fixed value at a phase-feed capacity value, calculating a low excitation limiting action value through a calculation formula, slowly reducing the reactive power of a test unit to be close to the calculated low excitation limiting action value, verifying whether the low excitation limiting action value acts correctly, raising the low excitation limiting setting value if the reactive power value does not act before the phase-feed capacity value, reducing the reactive power of the unit again until the low excitation limiting action value, and if the deviation between the actual low excitation limiting action value and the calculated low excitation limiting action value exceeds a set range, superposing a fixed reactive power offset value on a low excitation limiting action characteristic formula of an excitation regulator for adjustment until the error between the calculated low excitation limiting action value and the actual low excitation limiting action value is within the set range to obtain a final calculation formula;
(3) and setting the calculated action value of the low excitation limit as a unit phase advancing capacity value or approaching the unit phase advancing capacity value as much as possible, and calculating the fixed value of the low excitation limit according to a final calculation formula.
The excitation regulator low excitation limit optimizing and setting system is characterized in that the low excitation limit fixed value which is set is finely adjusted, and the specific process is as follows: and after the low excitation limiting fixed value is set, slowly reducing the idle work of the unit under the fixed value until the low excitation limiting action, if the low excitation limiting does not act or acts more in advance in the process, fine-adjusting the low excitation limiting fixed value again until the actual action value of the low excitation limiting is close to the phase advance capacity value of the unit.
The excitation regulator low excitation limit optimizing and setting system is characterized in that the reactive power of the unit is reduced, and the minimum reactive power cannot exceed the phase-entering capacity of the unit in the reactive power reduction process.
The invention achieves the following beneficial effects: the invention reduces the idle work of the generator set until the deviation between the low excitation limiting actual action value of the excitation regulator and the calculated low excitation limiting action value obtained when the excitation regulator performs the low excitation limiting action exceeds the set range or not by comparing, if so, the calculation formula of the low excitation limiting action value is adjusted, the deviation is compared again until the deviation is within the set range to obtain the final calculation formula of the low excitation limiting action value, and the calculated low excitation limiting action value is equal to or approaches the set phase advance capacity setting low excitation limiting fixed value according to the final calculation formula of the low excitation limiting action value; after the low excitation limiting fixed value is set, the set low excitation limiting fixed value is fine-tuned through a generator set phase advance test again until the error between the actual low excitation limiting action value and the phase advance capacity value is within an allowable range; the low excitation limit fixed value is optimized, so that the purposes of reasonably matching low excitation limit and field loss protection, fully exerting the unit phase advance capability and ensuring the safe phase advance operation of the unit within the phase advance capability are achieved, the popularization of the method is beneficial to the exertion of the unit phase advance capability and can also improve the safe operation level of the unit, and the method is a very significant thing with economic value and has good application prospect.
Drawings
FIG. 1 is a flow chart of the method of the present invention;
FIG. 2 is a graph of the calculation of the phase advance capability value and the low excitation limiting action value of a certain unit;
FIG. 3 is a graph of the calculated values of the low excitation limit setting value and the low excitation limit action of a certain optimized unit.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
As shown in fig. 1, a low excitation limit optimization setting method for an excitation regulator includes the steps of:
step one, obtaining a phase advance capability value of the generator set under different active working conditions (namely, a reactive value of the maximum energy absorption of the generator, wherein the phase advance capability value is a basis for setting a low excitation limit fixed value) through a phase advance test of the generator set.
The first step comprises the following specific processes: the unit phase advance capability test is required to be carried out according to DL-T1523-. During phase advance, reducing the reactive power of a unit until any one of limiting factors including generator terminal voltage, a static stability limit, generator terminal current, temperature, service voltage and system voltage of a generator reaches a limit value, taking the reactive value as the current active lower unit phase advance capability value, and carrying out phase advance tests on various active working conditions (three turbines and four turbines) to obtain the unit phase advance capability values under different active working conditions as the basis of setting of low excitation limiting fixed values, wherein fig. 2 is a corresponding curve of the unit phase advance capability values obtained after a certain unit carries out the phase advance tests; table 1 is a table of the unit phase advance capability values obtained after a certain unit in fig. 2 performs a phase advance test;
TABLE 1 Table of the advancing capability and action value of a unit obtained after a certain unit has developed the advancing test
| active/MW | 300 | 450 | 600 |
| Phase advance capability value/Mvar | -200 | -150 | -70 |
| Low excitation limit calculated motion value/Mvar | -175 | -131 | -61 |
| Low excitation limit actual motion value/Mvar | -172 | — | — |
Step two, obtaining a calculation formula of low excitation limiting action characteristics according to the manufacturer and the model of the excitation regulator, calculating a low excitation limiting action value, reducing the idle work of a unit until the low excitation limiting action is achieved, obtaining a low excitation limiting actual action value, adjusting the calculation formula to recalculate the low excitation limiting action value if the deviation of the calculated low excitation limiting action value and the low excitation limiting actual action value exceeds a set range, and re-testing until the deviation is within the set range to obtain a final calculation formula; setting a low excitation limit fixed value according to a final calculation formula by taking the calculated low excitation limit action value approaching or equal to the unit phase advance capacity value as a setting principle;
setting a low excitation limit fixed value, comprising the following steps:
(1) obtaining a calculation formula of low excitation limiting action characteristics according to the manufacturer and the model of the excitation regulator;
the calculation formulas of the action characteristics of the excitation regulators of different manufacturers and different models are different, such as: the low excitation limiting action value of the excitation regulator of a plurality of manufacturers is the product relation of the square of the terminal voltage and the low excitation limiting fixed value, and is shown as the following formula:
Qi＝(U/UN)2·Qi' (1)
in the formula, QiA low excitation limit action value; qi' is a low excitation limit setting value; u is the actual terminal voltage; u shapeNIs the rated terminal voltage;
after the excitation regulator of some manufacturers is in low excitation limiting action, the reactive power has the uplifting process, and the reactive power after the action becomes:
Qi″＝(U/UN)2·Qi'+△Q (2)
in the formula, Qi"is the low excitation limit action value; qi' is a low excitation limit setting value; u is the actual terminal voltage; u shapeNIs the rated terminal voltage; delta Q is the reactive power value of uplift;
in addition, in some foreign manufacturers, the low excitation limiting action value is a variable related to various factors such as active power, reactive power, a low excitation limiting fixed value and the like, and is obtained through a more complex calculation formula, and a specific calculation mode needs to be determined by the manufacturers.
In this embodiment, when the active power of the unit is 300MW, the phase advance capability value is-200 Mvar, and the terminal voltage is measured to be 93.6% of the rated value, the active power is 300MW through the formula (1) of the low excitation motion characteristic of the excitation regulator, and the low excitation limit fixed value is-175 Mvar when the phase advance capability value is-200 Mvar, as shown in table 2.
(2) When the active power of the unit is 300MW, setting a low excitation limit fixed value to be about 10Mvar above a phase advance capacity value-200 Mvar under the active power of 300MW during test, such as: 190Mvar, calculating a low excitation limiting action value when the active power of the unit is 300MW and the low excitation limiting setting value is-190 Mvar through the formula (1), slowly reducing the reactive power of the test unit to be close to the calculated low excitation limiting action value, verifying whether the low excitation limiting action is correct or not, and when the reactive power of the test unit is reduced, the reactive power value of the test unit cannot exceed a phase advance capability value (-200Mvar) during a phase advance test; if the reactive power value does not act before-200 Mvar, the low excitation limit setting value can be raised, such as-180 Mvar, and the reactive power of the unit is reduced again until the low excitation limit acts. And if the deviation between the low excitation limiting actual action value and the calculated low excitation limiting action value is large, a superposition fixed reactive deviation value can be adjusted according to a low excitation limiting action characteristic formula of the excitation regulator provided by a manufacturer until the error between the calculated low excitation limiting action value and the actual low excitation limiting action value is within a range of 5%. In the embodiment, when the unit works at 300MW, the setting fixed value is a phase advance capacity value of-200 Mvar, the calculated low excitation limiting action value is-175 Mvar, the reactive value of the test unit is slowly reduced until the low excitation limiting action is reached, the actual low excitation limiting action value is-172 Mvar, the estimated deviation is 1.6%, and the action characteristic calculation formula is correct within the range of 5%. The low excitation limit fixed value is set to the phase advance capacity value so as to verify the correctness of the formula, and the method is also the current low excitation limit setting method.
(3) The low excitation limit action value calculated by the excitation regulator is consistent with or approaches to the unit phase advance capacity value as much as possible, and a low excitation limit fixed value is calculated;
according to the verified low excitation limiting action characteristic calculation formula, setting three active low excitation limiting fixed values in a mode that the calculated low excitation limiting action value approaches the corresponding active phase advance capacity value of the unit under three active powers of 300MW, 450MW and 600MW respectively. Such as: the action characteristic after verification is a formula (1), the calculated low excitation limiting action value is equal to the phase advance capacity value of the generator during the test, the low excitation limiting fixed value is calculated by using the formula (1), and as shown in fig. 3, a table 2 shows three low excitation limiting setting values and calculated action values under active power;
table 2 shows the low excitation limit setting value and the calculated action value under three active power conditions
When the power is 300MW, the calculated low excitation limiting action value is-200 Mvar according to the terminal voltage when the reactive power is the phase advance capacity value-200 Mvar, the set low excitation limiting setting value can be obtained to be-228 Mvar according to the verified formula (1), and the setting value at 450MW is-171 Mvar and the setting value at 600MW is-80 Mvar can be obtained by the same method.
And step three, after the low excitation limiting fixed value is set, the set low excitation limiting fixed value is fine-tuned through test verification again until the error between the actual low excitation limiting action value and the phase advance capacity value is within an allowable range. The set low excitation limit constant value is verified through tests, and the actual action value approaches the phase advance capacity value and does not exceed the phase advance capacity value.
After a low excitation limiting fixed value is set, slowly reducing the reactive power of the unit under the fixed value until the low excitation limiting action is carried out, wherein the minimum reactive power cannot exceed the phase advance capability of the unit in the reactive power reduction process; if the low excitation limit is not actuated in the process, or the low excitation limit is actuated more in advance, the fixed value of the low excitation limit can be slightly adjusted again until the actual actuation value of the low excitation limit is close to the phase advance capacity value of the unit.
In this embodiment, at 50% of rated active power (300MW), the calculated low excitation limit action value is-200 Mvar, the actual low excitation limit action value is-197 Mvar, the estimated deviation is 1.5%, and the fixed value is set reasonably within the range of 5%. If the reactive power is reduced to-200 Mvar, the low excitation limit is still not acted, the setting value is synchronously shifted by 5Mvar and is set to-223 Mvar, the reactive power is reduced again, whether the setting value is acted or not is seen when the setting value is-200 Mvar, and the setting value is shifted step by step until the action position is reached. If the reactive power acts at the low excitation limit of-180 Mvar, the low excitation limit constant value can be shifted downwards and set to-233 Mvar until the deviation between the action value and the phase advance capability value is within 5 percent. Finally, the fixed values of 450MW and 600MW are shifted by the same offset.
A low excitation limit optimization setting system of an excitation regulator is characterized by comprising the following components:
the setting low excitation limiting fixed value module is used for comparing whether the deviation between the actual low excitation limiting action value of the excitation regulator obtained when the reactive power of the generator set is reduced until the low excitation limiting action of the excitation regulator exceeds a set range or not, if so, adjusting a low excitation limiting action value calculation formula, re-comparing the deviation until the deviation is within the set range to obtain a final low excitation limiting action value calculation formula, and according to the final low excitation limiting action value calculation formula, setting the low excitation limiting fixed value by the calculated low excitation limiting action value to be equal to or approximate to the set phase feeding capacity setting low excitation limiting fixed value; the calculated low excitation limiting action value is calculated according to a calculation formula of low excitation limiting action characteristics;
and the fine-tuning set low excitation limiting fixed value module is used for fine-tuning the set low excitation limiting fixed value through a generator set phase advance test until the error between the actual low excitation limiting action value and the phase advance capacity value is within an allowable range.
The specific process of setting the low excitation limit fixed value is as follows:
(1) obtaining a calculation formula of low excitation limiting action characteristics according to the manufacturer and the model of the excitation regulator;
(2) setting a low excitation limiting fixed value at a phase-feed capacity value, calculating a low excitation limiting action value through a calculation formula, slowly reducing the reactive power of a test unit to be close to the calculated low excitation limiting action value, verifying whether the low excitation limiting action value acts correctly, raising the low excitation limiting setting value if the reactive power value does not act before the phase-feed capacity value, reducing the reactive power of the unit again until the low excitation limiting action value, and if the deviation between the actual low excitation limiting action value and the calculated low excitation limiting action value exceeds a set range, superposing a fixed reactive power offset value on a low excitation limiting action characteristic formula of an excitation regulator for adjustment until the error between the calculated low excitation limiting action value and the actual low excitation limiting action value is within the set range to obtain a final calculation formula;
(3) and setting the calculated action value of the low excitation limit as a unit phase advancing capacity value or approaching the unit phase advancing capacity value as much as possible, and calculating the fixed value of the low excitation limit according to a final calculation formula.
The fine adjustment of the set low excitation limit fixed value comprises the following specific processes: and after the low excitation limiting fixed value is set, slowly reducing the idle work of the unit under the fixed value until the low excitation limiting action, if the low excitation limiting does not act or acts more in advance in the process, fine-adjusting the low excitation limiting fixed value again until the actual action value of the low excitation limiting is close to the phase advance capacity value of the unit.
The reactive power of the unit is reduced, and the minimum reactive power cannot exceed the phase advancing capability of the unit in the reactive power reduction process.
In conclusion, the low excitation limit optimizing and setting method and the low excitation limit optimizing and setting system of the excitation regulator optimize the low excitation limit fixed value, are reasonably matched with the field loss protection, fully exert the phase advance capability of the unit and can ensure the aim of safe phase advance operation of the unit within the phase advance capability. The invention can give full play to the due phase advancing capability of the generator set, improves the operation safety level of the power grid and has good application prospect.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (9)
1. A low excitation limit optimization setting method of an excitation regulator is characterized by comprising the following steps: the method comprises the following steps:
step one, comparing whether the deviation between the low excitation limiting actual action value of the excitation regulator and the calculated low excitation limiting action value obtained when the reactive power of the generator set is reduced until the low excitation limiting action of the excitation regulator exceeds a set range or not is compared, if the deviation exceeds the set range, adjusting a low excitation limiting action value calculation formula, re-comparing the deviation until the deviation is within the set range to obtain a final low excitation limiting action value calculation formula, and setting a low excitation limiting fixed value according to the final low excitation limiting action value calculation formula and the calculated low excitation limiting action value to be equal to or approximate to a set phase advance capacity value; the calculated low excitation limiting action value is calculated according to a low excitation limiting action value calculation formula;
step two, after the low excitation limiting fixed value is set, the set low excitation limiting fixed value is fine-tuned through a generator set phase advance test again until the error between the actual low excitation limiting action value and the phase advance capacity value is within an allowable range;
the phase advance capability value is as follows: and when the phase enters, the reactive power of the unit is reduced until any parameter of the limiting factors of the generator reaches the reactive power value of the limit value.
2. The excitation regulator low excitation limit optimization setting method as claimed in claim 1, wherein: the limiting factors of the generator comprise generator terminal voltage, a static stability limit, generator terminal current, temperature, service voltage and system voltage of the generator.
3. The excitation regulator low excitation limit optimization setting method as claimed in claim 1, wherein: the specific process of the step one is as follows:
(1) obtaining a low excitation limit action value calculation formula according to the manufacturer and the model of the excitation regulator;
(2) setting a low excitation limiting fixed value at a phase-feed capacity value, calculating a low excitation limiting action value through a calculation formula, slowly reducing the reactive power of a test unit to be close to the calculated low excitation limiting action value, verifying whether the low excitation limiting action value acts correctly, raising the low excitation limiting setting value if the reactive power value does not act before the phase-feed capacity value, reducing the reactive power of the unit again until the low excitation limiting action value, and if the deviation between the actual low excitation limiting action value and the calculated low excitation limiting action value exceeds a set range, superposing a fixed reactive power offset value on a low excitation limiting action value formula of an excitation regulator for adjustment until the error between the calculated low excitation limiting action value and the actual low excitation limiting action value is within the set range to obtain a final calculation formula;
(3) and setting the calculated action value of the low excitation limit as a unit phase advancing capacity value or approaching the unit phase advancing capacity value as much as possible, and calculating the fixed value of the low excitation limit according to a final calculation formula.
4. The excitation regulator low excitation limit optimization setting method as claimed in claim 1, wherein: the second step comprises the following specific processes: and after the low excitation limiting fixed value is set, slowly reducing the idle work of the unit under the fixed value until the low excitation limiting action, if the low excitation limiting does not act in the process or acts more in advance, fine-adjusting the low excitation limiting fixed value again until the actual action value of the low excitation limiting is close to the phase advance capacity value of the unit.
5. The excitation regulator low excitation limit optimization setting method as claimed in claim 4, wherein: and in the reactive power reduction process of the unit, the minimum reactive power of the unit does not exceed the phase advance capability of the unit.
6. A low excitation limit optimization setting system of an excitation regulator is characterized by comprising the following components:
the setting low excitation limiting fixed value module is used for comparing whether the deviation between the actual low excitation limiting action value of the excitation regulator obtained when the reactive power of the generator set is reduced until the low excitation limiting action of the excitation regulator exceeds a set range or not, if so, adjusting a low excitation limiting action value calculation formula, re-comparing the deviation until the deviation is within the set range to obtain a final low excitation limiting action value calculation formula, and according to the final low excitation limiting action value calculation formula, setting the low excitation limiting fixed value by the calculated low excitation limiting action value to be equal to or approximate to the set phase feeding capacity setting low excitation limiting fixed value; the calculated low excitation limiting action value is calculated according to a calculation formula of the low excitation limiting action value;
the fine-tuning set low excitation limiting fixed value module is used for fine-tuning the set low excitation limiting fixed value through a generator set phase advance test until the error between the actual low excitation limiting action value and the phase advance capacity value is within an allowable range;
the phase advance capability value is as follows: and when the phase enters, the reactive power of the unit is reduced until any parameter of the limiting factors of the generator reaches the reactive power value of the limit value.
7. The excitation regulator low excitation limit optimization setting system as claimed in claim 6, wherein the specific process of setting the low excitation limit fixed value is as follows:
(1) obtaining a calculation formula of a low excitation limiting action value according to the manufacturer and the model of the excitation regulator;
(2) setting a low excitation limit fixed value at a phase-feed capacity value, calculating a low excitation limit action value through a calculation formula, slowly reducing the reactive power of a test unit to be close to the calculated low excitation limit action value, verifying whether the low excitation limit acts correctly, raising the low excitation limit setting value if the reactive power value does not act before the phase-feed capacity value, reducing the reactive power of the unit again until the low excitation limit action, and if the deviation between the actual low excitation limit action value and the calculated low excitation limit action value exceeds a set range, superposing a fixed reactive power offset value on a low excitation limit action value calculation formula of an excitation regulator for adjustment until the error between the calculated low excitation limit action value and the actual low excitation limit action value is within the set range to obtain a final calculation formula;
(3) and setting the calculated action value of the low excitation limit as a unit phase advancing capacity value or approaching the unit phase advancing capacity value as much as possible, and calculating the fixed value of the low excitation limit according to a final calculation formula.
8. The excitation regulator low excitation limit optimization setting system according to claim 6, wherein the fine adjustment of the set low excitation limit fixed value is carried out by the following specific processes: and after the low excitation limiting fixed value is set, slowly reducing the idle work of the unit under the fixed value until the low excitation limiting action, if the low excitation limiting does not act or acts more in advance in the process, fine-adjusting the low excitation limiting fixed value again until the actual action value of the low excitation limiting is close to the phase advance capacity value of the unit.
9. The excitation regulator low excitation limit optimization setting system according to claim 8, wherein the unit reactive power is reduced, and the minimum reactive power in the process of reducing the reactive power does not exceed the unit phase-advancing capability.
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