CN117494094B - Prediction method for maximum phase advance depth of hydro-generator limited by loss of excitation protection - Google Patents
Prediction method for maximum phase advance depth of hydro-generator limited by loss of excitation protection Download PDFInfo
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Abstract
A prediction method for maximum phase advance depth of a hydro-generator limited by loss of magnetic protection is characterized in that a double-coordinate system is used for synchronous drawing, firstly, loss magnetic circle parameters of an R-X coordinate system are mapped to a P-Q coordinate system, then, intersection points of an active line and the loss magnetic circle in the P-Q coordinate system are judged by analytic geometry, and then, intersection point coordinates of a phase-retarding operation area are mapped back to the R-X coordinate system, and a machine end impedance position corresponding to a phase advance point is displayed. The position relation between the phase point and the loss circle and the position relation between the impedance point at the machine end and the loss circle can be visually displayed. The invention can intuitively calculate the maximum phase advance depth under the given condition, and prevent the abnormal shutdown of the phase advance operation of the generator set due to overlarge phase advance depth without exiting protection.
Description
Technical Field
The invention belongs to the field of relay protection, and particularly relates to a prediction method for maximum phase advance depth of a hydraulic generator limited by loss of magnetic protection.
Background
The coordination of the network-related parameters of the excitation system and the relay protection is an important content of network source coordination, and the coordination of the phase advance experiment and the loss of magnetic protection of the generator is one of the important content. Because the unit is generally not considered to perform phase advance operation in design, and the limiting factors suffered by the unit during the phase advance operation are various, the factors which play roles are different under different mode conditions, the limiting criterion for the phase advance depth is determined to be a comprehensive criterion consisting of various factors, and because various criteria are complex, the operator is difficult to master. In a conventional phase advance experiment on site, the impedance position of a machine end under a given active parameter cannot be rapidly analyzed due to the multiple coupling relation of the generator parameters, the loss of magnetism protection has the risk of misoperation, only the protection pressing plate can be selected to be withdrawn, the phase advance operation of the generator is a safe and normal working condition, and the direct withdrawal of the protection of a unit is obviously unreasonable. In the existing scheme, the loss of magnetic protection or protection pressing plate must be withdrawn before the experiment, and then the phase advance experiment of the generator can be started. The specific flow is as follows:
Step one, the operator exits the generator loss of magnetic protection function or the protection pressing plate. This step is to ensure that during the phase advance experiment, the generator will not be misjudged as loss of excitation due to excessive phase advance depth, thereby triggering a protection mechanism and causing the generator to stop.
And step two, carrying out a generator phase advance experiment. The phase advance experiment determines the phase advance operation capacity and limiting factors of the generator by changing the exciting current of the generator.
And thirdly, after the phase advance experiment is finished, an operator needs to restart the loss-of-magnetic protection function of the generator or recover or protect the pressing plate.
The disadvantages of the prior art are:
1. The loss of magnetic protection or the pressing plate thereof is needed to be withdrawn before the phase advance experiment, and the protection mechanism of the generator is destroyed. If an unexpected fault occurs during the phase advance experiment, damage to the generator may be caused.
2. The technical scheme cannot rapidly and accurately analyze and calculate the maximum phase advance depth of the generator under a given active power. This increases the risk of conducting phase advance experiments, which may result in excessive phase advance depths and abnormal shutdown of the unit.
Therefore, a new technical scheme is needed, and the phase advance experiment of the generator can be safely and accurately carried out under the condition that the loss of excitation protection or the protection pressing plate is not withdrawn.
Disclosure of Invention
In view of the technical problems existing in the background art, the prediction method of the maximum phase advance depth of the hydro-generator limited by the loss of excitation protection can intuitively calculate the maximum phase advance depth under given conditions, and prevent the phase advance operation of the generator set from abnormal shutdown due to overlarge phase advance depth without exiting protection.
In order to solve the technical problems, the invention adopts the following technical scheme:
a prediction method of maximum phase depth limited by loss of excitation protection of a hydraulic generator adopts an R-X plane loss of excitation circle drawing module, a P-Q plane loss of excitation circle range drawing module, a P-Q plane low excitation limit curve drawing module, a P-Q plane experimental voltage loss of excitation circle drawing module, a P-Q plane active line drawing module, a P-Q plane low excitation limit analysis module, a P-Q phase limit analysis module, a P-Q plane and R-X plane phase limit display module and an experimental parameter storage module; the prediction method comprises the following steps:
Step 1, inputting a loss magnetic protection fixed value to an R-X plane loss magnetic circle drawing module, and inputting a machine end voltage range to a P-Q plane loss magnetic circle range drawing module; inputting low excitation limiting parameters to a P-Q plane low excitation limiting curve drawing module;
Step 2, the R-X plane loss magnetic circle drawing module analyzes the loss magnetic protection fixed value, judges whether the loss magnetic impedance circle belongs to a stable circle or an asynchronous circle type, and draws the loss magnetic circle under an R-X coordinate system according to the circle center and the radius; the decoupling-based under-P-Q plane loss-of-field circle is a circle determined by the machine end voltage U g;
The P-Q plane loss of magnetic circle limit range drawing module draws the upper and lower limit ranges of the loss of magnetic circle in a P-Q coordinate system according to voltage limit;
the P-Q plane low excitation limiting curve drawing module automatically judges whether a loss magnetic impedance circle belongs to a linear type, a circular type and a power angle type according to the input low excitation limiting parameter, and draws a low excitation limiting curve under a P-Q coordinate system;
Step 3, the P-Q plane loss of magnetization circle limiting range drawing module inputs experimental voltage to the P-Q plane experimental voltage loss of magnetization circle drawing module, and the P-Q plane loss of magnetization circle limiting range drawing module inputs experimental active power to the Q plane and other active line drawing modules;
The P-Q plane low excitation limit analysis module analyzes the cooperation between the generator low excitation limit and the loss of excitation protection according to an analytic geometry principle, and judges whether the cooperation relation between the low excitation limit curve drawn by the P-Q plane low excitation limit curve drawing module and the loss of excitation circle image drawn by the P-Q plane experimental voltage loss of excitation circle drawing module meets the requirement;
Step 4, the active line drawing modules of the Q plane and the like draw the active line images of the Q plane and the like in a P-Q coordinate system according to the input experimental active power P set,
Step 5, the P-Q plane phase advance limit analysis module determines a phase advance limit value Q max which corresponds to a loss magnetic protection fixed value and can avoid protection misoperation according to the intersection point between an equal active line drawn by an experimental active P set and a loss magnetic circle drawn by an experimental voltage U set;
Step 6, a phase advance limit display module of the P-Q plane and the R-X plane respectively draws points representing the phase advance limit positions under a P-Q coordinate system and an R-X coordinate system according to the phase advance limit Q max calculated by the phase advance limit analysis module of the P-Q plane, wherein the points of the P-Q coordinate system intuitively display the coordination relation of active, reactive and loss magnetic protection, and the points of the R-X coordinate system intuitively display the coordination relation of the current generator terminal impedance and the loss magnetic protection;
step 7, the experimental parameter storage module stores the data and the images obtained by analysis and processing to generate an electronic version report;
and 8, drawing of an R-X coordinate system and a P-Q coordinate system changes in real time according to input parameters, so that prediction of maximum phase advance depth of the hydro-generator limited by loss of excitation protection is realized.
Preferably, in step 3, the map drawing module 4 draws a map of the demagnetizing circle in the P-Q coordinate system according to the input experimental voltage U set as shown in fig. 3; setting the circle center of the loss magnetic circle in the R-X plane as (0, X c) and the radius as X r;
the demagnetizing circle of the P-Q plane can be expressed as:
wherein P represents the active power generated by the generator, Q represents the reactive power generated by the generator, and U represents the generator terminal voltage.
Preferably, in step 3, the low excitation limit of the generator is ensured to act first, and the generator acts only after a settable transition margin and a stable circle; and labeling and prompting parameters which do not meet the requirements, and giving a reasonable setting range according to a low excitation limiting equation. And the rationality verification of the low excitation limit setting matched with the protection device can be performed, and margin data and images can be intuitively provided.
The invention has the following beneficial effects:
The invention can intuitively calculate the maximum phase advance depth under the given condition, and prevent the abnormal shutdown of the phase advance operation of the generator set due to overlarge phase advance depth without exiting protection. Meanwhile, whether the matching between the low excitation limit and the generator loss magnetic protection and phase advance test meets the requirement can be analyzed, and an adjustment method is provided for the low excitation limit parameters which do not meet the matching relation, so that the rationality and safety of the generator phase advance test are improved.
According to the invention, the matching relation between the loss magnetic protection and the phase advance test of the generator can be visually displayed through a computer graph, the type and the action area of the loss magnetic circle can be automatically judged, the limit phase advance depth under the given condition can be accurately calculated after the coordinate transformation, the phase advance limit under the given parameter can be defined according to the phase advance limit point reverse-pushing machine end impedance position and synchronously drawn, the loss magnetic protection or the protection pressing plate does not need to be withdrawn during the phase advance test of the generator, the protection mechanism of the unit is ensured to be in an enabled state in the whole test process, and the safety of the unit is enhanced.
The method can determine whether the low excitation limiting curve is completely in the static circle of the loss magnetic protection, and whether the margin between the low excitation limiting curve and the static circle is reasonable and the matching relationship between the low excitation limiting curve and the static circle is correct, namely the rationality verification of the low excitation limiting parameter.
Drawings
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
FIG. 1 is a logic flow diagram of the present invention;
FIG. 2 is a graph of the R-X plane fit relationship of the present invention;
FIG. 3 is a diagram of the P-Q plane matching relationship of the present invention;
FIG. 4 is a dual coordinate system synchronous plot of the present invention;
FIG. 5 is a diagram of a computer graphics interface in accordance with the present invention.
In the figure: the device comprises an R-X plane loss of excitation circle drawing module 1, a P-Q plane loss of excitation circle range drawing module 2, a P-Q plane low excitation limit curve drawing module 3, a P-Q plane experimental voltage loss of excitation circle drawing module 4, a P-Q plane active line drawing module 5, a P-Q plane low excitation limit analysis module 6, a P-Q phase advance limit analysis module 7, a P-Q plane and R-X plane phase advance limit display module 8 and an experimental parameter storage module 9.
Detailed Description
Example 1:
1-5, the prediction method of maximum phase advance depth of the hydro-generator limited by loss of excitation protection adopts an R-X plane loss of excitation circle drawing module 1, a P-Q plane loss of excitation circle range drawing module 2, a P-Q plane low excitation limiting curve drawing module 3, a P-Q plane experimental voltage loss of excitation circle drawing module 4, a P-Q plane active line drawing module 5, a P-Q plane low excitation limiting analysis module 6, a P-Q phase advance limit analysis module 7, a P-Q plane and R-X plane phase advance limit display module 8 and an experimental parameter storage module 9.
Data sources: the center parameter X c and the radius parameter X r of the loss magnetic protection are provided by a field unit protection fixed value list, the machine end voltage U g is limited to be 90% -100% by default and can be modified, the experimental voltage U set and the experimental active p set are input by an experimenter according to the current experimental requirement, the low excitation limit is input by the past experimental record or setting calculation, and the loss magnetic circle margin percentage, the low excitation limit and the loss magnetic circle transition margin percentage are limited to be 10% by default and can be modified.
The prediction method comprises the following steps:
Step 1, inputting a loss magnetic protection fixed value to an R-X plane loss magnetic circle drawing module 1, and inputting a machine end voltage range to a P-Q plane loss magnetic circle range drawing module 2; inputting low excitation limiting parameters into the P-Q plane low excitation limiting curve drawing module 3;
Step 2, the R-X plane loss magnetic circle drawing module 1 analyzes the loss magnetic protection fixed value, judges whether the loss magnetic impedance circle belongs to a stable circle or an asynchronous circle type, and draws the loss magnetic circle under an R-X coordinate system according to the circle center and the radius; the decoupling-based under-P-Q plane loss-of-field circle is a circle determined by the machine end voltage U g;
the P-Q plane loss of magnetic circle limit range drawing module 2 draws the upper and lower limit ranges of the loss of magnetic circle in a P-Q coordinate system according to voltage limit;
The P-Q plane low excitation limiting curve drawing module 3 automatically judges whether the loss magnetic impedance circle belongs to a linear type, a circular type or a power angle type according to the input low excitation limiting parameter, and draws a low excitation limiting curve under a P-Q coordinate system;
Step 3, the P-Q plane loss of magnetization circle limiting range drawing module 2 inputs experimental voltage to the P-Q plane experimental voltage loss of magnetization circle drawing module 4, and the P-Q plane loss of magnetization circle limiting range drawing module 2 inputs experimental power to the Q plane active line drawing module 5;
the P-Q plane experiment voltage loss magnetic circle drawing module 4 draws a loss magnetic circle image in a P-Q coordinate system according to the input experiment voltage U set as shown in fig. 3. The circle center of the loss magnetic circle on the R-X plane is (0, X c), and the radius is X r. The demagnetizing circle of the P-Q plane can be expressed as Wherein P represents the active power generated by the generator, Q represents the reactive power generated by the generator, and U represents the generator terminal voltage.
The P-Q plane low excitation limit analysis module 6 analyzes the cooperation between the generator low excitation limit and the loss of excitation protection according to an analytic geometry principle, and judges whether the cooperation relationship between the low excitation limit curve drawn by the P-Q plane low excitation limit curve drawing module 3 and the loss of excitation circle image drawn by the P-Q plane experimental voltage loss of excitation circle drawing module 4 meets the requirement; the low excitation limit of the generator is ensured to act first, and the stable circle acts only after the settable transition margin. And labeling and prompting parameters which do not meet the requirements, and giving a reasonable setting range according to a low excitation limiting equation.
Step 4, the active line drawing module 5 of the Q plane and the like draws an active line image of the Q plane and the like in a P-Q coordinate system according to an input experiment active P set,
Step 5, the phase advance limit analysis module 7 of the P-Q plane determines a phase advance limit value Q max which corresponds to a fixed value of the loss magnetic protection and can avoid protection misoperation according to the intersection point between the equal active line drawn by the experimental active P set and the loss magnetic circle drawn by the experimental voltage U set;
And 6, a phase advance limit display module 8 of the P-Q plane and the R-X plane respectively draws points representing the phase advance limit positions under the P-Q coordinate system and the R-X coordinate system according to the phase advance limit Q max calculated by the phase advance limit analysis module 7 of the P-Q plane, wherein the points of the P-Q coordinate system visually display the coordination relation of active, reactive and demagnetizing protection, and the points of the R-X coordinate system visually display the coordination relation of the current generator terminal impedance and the demagnetizing protection.
And 7, the experimental parameter storage module 9 stores the data and the images obtained by analysis and processing to generate an electronic version report.
And 8, drawing of an R-X coordinate system and a P-Q coordinate system changes in real time according to input parameters, so that prediction of maximum phase advance depth of the hydro-generator limited by loss of excitation protection is realized.
Compared with the prior art, the invention has the innovation points that:
1. The dual-coordinate system synchronous drawing is carried out, firstly, the loss magnetic circle parameters of the R-X coordinate system are mapped to the P-Q coordinate system, then, the intersection points of the active lines and the loss magnetic circle in the P-Q coordinate system are judged by analysis geometry, and then, the intersection point coordinates of the phase-lag running area are mapped back to the R-X coordinate system, and the impedance positions of the machine ends corresponding to the phase-lag running points are displayed. And visually displaying the position relation between the phase point and the loss circle and the position relation between the impedance point at the machine end and the loss circle.
2. In the coordinate transformation process, the type of the loss circle is automatically judged. The asynchronous circle is mapped to the P-Q coordinate system, the action area is outside the circle, the static circle is mapped to the P-Q coordinate system, the action area is inside the circle, and the subsequent analysis processing is performed after the action area is determined.
3. Two points of intersection of an active line such as a P-Q coordinate system and a loss circle are arranged, the loss of the hysteresis zone points are automatically judged according to parameters, and the phase-entering operation points of the generator are taken as result points.
4. On the P-Q coordinate system, byCalculating the maximum phase advance reactive point, by/>And calculating the maximum active point. An implicit approximate asymptote is depicted as shown in fig. 2, from which the rationality of the approximate low-excitation limit curve is determined.
5. The real-time update of the equal active line along with the change of the experimental active p set, the real-time update of the loss circle along with the change of U set, and the data of different phase advance experimental points are stored in a custom chart for phase advance experimental reference.
6. The margin of the loss circle, the transition margin between the overexcitation curve and the loss circle can be set, so that the judgment of the result is more reasonable.
The invention can achieve the following technical effects:
1. and synchronously displaying the drawing and the calculation result, visually displaying the matching relation of the active, reactive and loss magnetic protection by the points of the P-Q coordinate system, and visually displaying the matching relation of the current generator end impedance and the loss magnetic protection by the points of the R-X coordinate system.
2. The loss of excitation protection or protection clamp plate are avoided to withdraw from in the generator phase advance experiment period, ensure that the protection mechanism of unit is in the start-up state in whole experimental process, reinforcing the security of unit.
3. And the phase advance limit corresponding to the fixed value of the loss magnetic protection is definitely determined, and the protection misoperation in the phase advance experiment process is prevented.
4. And judging whether the matching of the low excitation limit and the loss magnetic protection is reasonable or not by automatically fitting the parameters, and giving a setting suggestion.
The above embodiments are only preferred embodiments of the present invention, and should not be construed as limiting the present invention, and the scope of the present invention should be defined by the claims, including the equivalents of the technical features in the claims. I.e., equivalent replacement modifications within the scope of this invention are also within the scope of the invention.
Claims (3)
1. A prediction method for maximum phase advance depth of a hydro-generator limited by loss of magnetic protection is characterized by comprising the following steps: an R-X plane loss of excitation circle drawing module (1), a P-Q plane loss of excitation circle range drawing module (2), a P-Q plane low excitation limit curve drawing module (3), a P-Q plane experimental voltage loss of excitation circle drawing module (4), a P-Q plane active line drawing module (5), a P-Q plane low excitation limit analysis module (6), a P-Q phase advance limit analysis module (7), a P-Q plane and R-X plane phase advance limit display module (8) and an experimental parameter storage module (9) are adopted; the prediction method comprises the following steps:
Step1, inputting a loss magnetic protection fixed value to an R-X plane loss magnetic circle drawing module (1), and inputting a machine end voltage range to a P-Q plane loss magnetic circle range drawing module (2); inputting low excitation limiting parameters into a P-Q plane low excitation limiting curve drawing module (3);
Step 2, an R-X plane loss magnetic circle drawing module (1) analyzes the loss magnetic protection fixed value, judges whether a loss magnetic impedance circle belongs to a stable circle or an asynchronous circle type, and draws the loss magnetic circle under an R-X coordinate system according to the circle center and the radius; the decoupling result shows that the loss of magnetization circle under the P-Q plane is obtained by the voltage of the machine terminal A determined circle;
The P-Q plane loss of magnetic circle limit range drawing module (2) draws the upper and lower limit ranges of the loss of magnetic circle in a P-Q coordinate system according to voltage limit;
The P-Q plane low excitation limiting curve drawing module (3) automatically judges whether a loss magnetic impedance circle belongs to a linear type, a circular type or a power angle type according to the input low excitation limiting parameters, and draws a low excitation limiting curve under a P-Q coordinate system;
step 3, the P-Q plane loss of magnetization circle limiting range drawing module (2) inputs experimental voltage to the P-Q plane experimental voltage loss of magnetization circle drawing module (4), and the P-Q plane loss of magnetization circle limiting range drawing module (2) inputs experimental active power to the active line drawing module (5) such as a Q plane;
The P-Q plane low excitation limit analysis module (6) analyzes the cooperation between the generator low excitation limit and the loss of excitation protection according to an analytic geometry principle, and judges whether the cooperation relationship between the low excitation limit curve drawn by the P-Q plane low excitation limit curve drawing module (3) and the loss of excitation circle image drawn by the P-Q plane experimental voltage loss of excitation circle drawing module (4) meets the requirement;
Step 4, the active line drawing modules (5) of the Q plane and the like are used for carrying out active line drawing according to input experiments Drawing an active line image in a P-Q coordinate system,
Step 5, a P-Q plane phase advance limit analysis module (7) performs active power according to experimentsDrawn equal active line and experimental voltageIntersection points among the drawn loss magnetic circles are determined, and phase advance limit values corresponding to the loss magnetic protection fixed values and capable of avoiding protection misoperation are determined；
Step 6, a phase advance limit display module (8) of the P-Q plane and the R-X plane, and the phase advance limit value calculated according to the phase advance limit analysis module (7) of the P-Q planeRespectively drawing points representing the phase advance limit position under a P-Q coordinate system and an R-X coordinate system, wherein the points of the P-Q coordinate system visually display the coordination relation between active power, reactive power and loss magnetic protection, and the points of the R-X coordinate system visually display the coordination relation between the current generator terminal impedance and the loss magnetic protection;
step 7, the experimental parameter storage module (9) stores the data and the images obtained by analysis and processing to generate an electronic version report;
and 8, drawing of an R-X coordinate system and a P-Q coordinate system changes in real time according to input parameters, so that prediction of maximum phase advance depth of the hydro-generator limited by loss of excitation protection is realized.
2. The method for predicting maximum phase advance depth of a hydro-generator limited by loss of excitation protection according to claim 1, wherein: in step 3, the P-Q plane experiment voltage loss of magnetization circle drawing module 4 draws the input experiment voltageDrawing a loss-of-field circle image in a P-Q coordinate system; let the circle of loss of magnetization be (0,/>) in the center of the R-X plane) Radius is/>；
The demagnetizing circle of the P-Q plane is expressed as:
；
wherein P represents the active power generated by the generator, Q represents the reactive power generated by the generator, and U represents the generator terminal voltage.
3. The method for predicting maximum phase advance depth of a hydro-generator limited by loss of excitation protection according to claim 1, wherein: in the step 3, the low excitation limit of the generator is ensured to act firstly, and the generator acts only after a transition margin which can be set is passed; and labeling and prompting parameters which do not meet the requirements, and giving a reasonable setting range according to a low excitation limiting equation.
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