CN108802561A - Based on the minimum asynchronous oscillation center localization method for measuring impedance - Google Patents
Based on the minimum asynchronous oscillation center localization method for measuring impedance Download PDFInfo
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- CN108802561A CN108802561A CN201710311938.9A CN201710311938A CN108802561A CN 108802561 A CN108802561 A CN 108802561A CN 201710311938 A CN201710311938 A CN 201710311938A CN 108802561 A CN108802561 A CN 108802561A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/088—Aspects of digital computing
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Abstract
The invention discloses a kind of based on the minimum asynchronous oscillation center localization method for measuring impedance, includes the following steps, according to the grid structure of power grid, observation point is respectively provided in the both sides of several grades of circuits of the interconnector of power grid and subordinate；Calculate the minimum measurement impedance within the asynchronous oscillation period of each observation point；According to minimum measurement impedance of each observation point within the asynchronous oscillation period, the circuit where asynchronous oscillation center is determined；According to the circuit where asynchronous oscillation center, positioning asynchronous oscillation center.The asynchronous oscillation center localization method based on minimum measurement impedance of the present invention, impedance magnitude and direction are measured according to different observation point minimums, it is accurately positioned asynchronous oscillation center, impedance is measured as basis for estimation using minimum, improve the adaptability changed to power system operating mode, and the anti-interference to trend fluctuation during asynchronous oscillation and the unordered action of control device, it has a good application prospect.
Description
Technical field
The present invention relates to electric system asynchronous oscillation technical fields, and in particular to a kind of based on the minimum step-out for measuring impedance
Oscillation center location positioning method.
Background technology
Electric system may lose synchronization when meeting with multiple catastrophe failure, form two or more asynchronous operations
Subsystem, there are asynchronous oscillation sections, the both sides voltage phase difference of asynchronous oscillation section gradually to increase from initial value between subsystem
Adduction is more than 180 degree, at any time, total on step-out section interconnection then in 0 degree to 360 degree section periodically variation
There is the voltage magnitude of any minimum relative to other points, which is known as asynchronous oscillation center.
By taking two group of planes asynchronous oscillations as an example, the Coherent Generator Group frequency of asynchronous oscillation center side is higher than average frequency, in addition
The frequency of side Coherent Generator Group is less than average frequency, if the potential approximately equal of both sides equivalence unit is assumed, then asynchronous oscillation
The position at center is near the midpoint of system impedance.During practical asynchronous oscillation, the equivalence electricity of two side system of oscillation center
Gesture is not fully equal, and both sides equivalence potential amplitude not etc. can not cause oscillation center to be moved with the variation of both sides potential differential seat angle
It is dynamic.Therefore, asynchronous oscillation center position is accurately measured, and is analyzed in the different asynchronous oscillation periods, asynchronous oscillation center
The variation tendency of position to disclosing the step-out characteristic of studied power grid, and formulates rationally effective step-out control measure, has ten
Divide important directive significance.
Currently, the asynchronous oscillation center localization method generally used in the prior art, is mainly the following：(1)
The minimum point searching method of busbar voltage；(2)Track characteristic searching method；(3) two side bus phase angle difference searching methods,
Wherein, (1) and (2) can determine asynchronous oscillation centre bit near a certain busbar, be determined with this big where oscillation center
Regional extent, both methods is caused to be vulnerable to electric network swim in oscillatory process as step-out criterion using single characteristics quantity on the spot
The interference of the factors such as unusual fluctuations and the unordered action of control device, to influence the accuracy of judging result；(3) it can determine
Between two busbares of asynchronous oscillation centre bit Mr. Yu, but oscillation center location can not be yet further reduced, judge to tie
The accuracy of fruit is low.Three of the above method cannot define and the quantitative specific location for providing asynchronous oscillation center, how gram
The above problem is taken, is current urgent problem.
Invention content
The purpose of the present invention is overcoming the localization method of asynchronous oscillation center in the prior art, it is vulnerable to oscillatory process
The interference of the factors such as middle electric network swim unusual fluctuations and the unordered action of control device, influences the accuracy of judging result, and judge
As a result the low problem of accuracy.The asynchronous oscillation center localization method based on minimum measurement impedance of the present invention, according to not
Impedance magnitude and direction are measured with observation point minimum, is accurately positioned asynchronous oscillation center, impedance conduct is measured using minimum
Basis for estimation improves the adaptability changed to power system operating mode, and overcomes trend fluctuation during asynchronous oscillation
With the anti-interference of the unordered action of control device, have a good application prospect.
In order to achieve the above object, the technical solution adopted in the present invention is：
It is a kind of to be included the following steps based on the minimum asynchronous oscillation center localization method for measuring impedance,
Step (A), it is equal in the both sides of several grades of circuits of the interconnector of power grid and subordinate according to the grid structure of power grid
Observation point is set；
Step (B) calculates the minimum measurement impedance within the asynchronous oscillation period of each observation point；
Step (C) determines asynchronous oscillation center according to the minimum measurement impedance within the asynchronous oscillation period of each observation point
The circuit at place；
Step (D), according to the circuit determined where asynchronous oscillation center, positioning asynchronous oscillation center.
Asynchronous oscillation center localization method above-mentioned based on minimum measurement impedance, step (A), the subordinate are several
Grade circuit, takes subordinate's circuit on 1-4 grades of interconnecting ties road.
Asynchronous oscillation center localization method above-mentioned based on minimum measurement impedance, step (B) calculate each observation point
Minimum within the asynchronous oscillation period measure impedance, include the following steps,
(B1), it in each observation point, sets busbar and is directed toward circuit with reference to positive direction, to utilize measurement voltage and measurement electricity
The ratio of stream calculates the measurement impedance of the observation point；
(B2), when asynchronous oscillation occurs for power grid, the measurement impedance of the observation point is drawn out on impedance plane at any time
The geometric locus of variation, and within an asynchronous oscillation period, search out and measure locus of impedance and impedance plane initial point distance most
Close asynchronous oscillation impedance point；
(B3), calculating is directed toward the asynchronous oscillation impedance point from impedance plane origin and is formed by vector impedance, as the sight
Minimum measurement impedance of the measuring point within this asynchronous oscillation period；
(B4), (B1)-(B3) is repeated, calculates the minimum measurement impedance within the asynchronous oscillation period of each observation point.
Asynchronous oscillation center localization method above-mentioned based on minimum measurement impedance, step (C), according to each observation point
Minimum within the asynchronous oscillation period measure impedance, determine the circuit where asynchronous oscillation center, include the following steps,
(C1) the minimum of each observation point is drawn on impedance plane measures the corresponding vector of impedance；
(C2) the corresponding vector direction of each minimum measurement impedance is judged, if the minimum corresponding vector of impedance that measures is located at I, IV
When quadrant, the direction of the vector is just；When minimum, which measures the corresponding vector of impedance, is located at II, III quadrant, the direction of the vector
It is negative；
(C3), according to it is each it is minimum measure the corresponding vector direction of impedance, determine the circuit where asynchronous oscillation center, when and
Only when the minimum corresponding vector direction for measuring impedance of the observation point of a certain circuit both sides is timing, asynchronous oscillation center
On this circuit；
(C4), verification asynchronous oscillation center indicates to lose if the minimum direction for measuring impedance of other observation points is timing
Step oscillation center position is located at the reference positive direction of corresponding observation point, i.e. busbar is directed toward the direction of circuit；If others observation
The minimum impedance direction that measures of point is to indicate that asynchronous oscillation center is located at the reference negative direction of observation point, i.e. circuit when bearing
It is directed toward the direction of busbar, foundation is verified with this, whether accurate verifies circuit where determining asynchronous oscillation center.
Asynchronous oscillation center localization method above-mentioned based on minimum measurement impedance, step (D) are shaken according to step-out is determined
The circuit where center is swung, positioning asynchronous oscillation center includes the following steps,
(D1), it calculates the minimum of the circuit both sides observation point where asynchronous oscillation center and measures impedance value and the practical resistance of circuit
The percent value of anti-value；
(D2), the percent value per side shows exact position of the asynchronous oscillation center relative to the circuit side point,
It is finally completed the quantitative ranging to asynchronous oscillation center.
Asynchronous oscillation center localization method above-mentioned based on minimum measurement impedance, (D1), according in asynchronous oscillation
The sum of circuit both sides percent value where the heart verifies the accuracy of percent value result in 100 ± 5% error ranges.
The beneficial effects of the invention are as follows：The asynchronous oscillation center positioning side based on minimum measurement impedance of the present invention
Method, different observation point minimums measure impedance magnitude and direction, asynchronous oscillation center are accurately positioned, compared to existing side
Method, the specific location for providing asynchronous oscillation center that can be quantified, and oscillation center position in the different asynchronous oscillation periods is described
The change procedure set；Impedance is measured as basis for estimation using minimum, improves the adaptability changed to power system operating mode, with
And overcome the anti-interference of trend fluctuation and the unordered action of control device during asynchronous oscillation；It can be applied to electric system
Simulation analysis, the deep asynchronous oscillation characteristic for disclosing power grid；It can be applied to the configuration of Out-of-Step Splitting Systems device or Out-of-Step Splitting Systems system
Research and fixed value adjusting, formulation is reasonably layouted and setting program；It can be applied to Out-of-Step Splitting Systems device or Out-of-Step Splitting Systems system pair
The calculating of asynchronous oscillation center, and track the drift of oscillation center, it is ensured that the correctness of islanding control measure reduces malfunction
With the risk of tripping, have a good application prospect.
Description of the drawings
Fig. 1 is the flow chart based on the minimum asynchronous oscillation center localization method for measuring impedance of the present invention；
Fig. 2 is the schematic diagram of the observation point setting of the Power grid structure of one embodiment of the invention；
Fig. 3 is the minimum signal that measures impedance of one embodiment of the invention difference observation point within an asynchronous oscillation period
Figure；
Fig. 4 is the schematic diagram that one embodiment of the invention minimum measures impedance and asynchronous oscillation period-luminosity relation；
Fig. 5 is that one embodiment of the invention measures showing for impedance direction positioning asynchronous oscillation center according to different observation point minimums
It is intended to；
Fig. 6 is one embodiment of the invention according to the minimum signal for measuring impedance value and being accurately positioned asynchronous oscillation center
Figure.
Specific implementation mode
Below in conjunction with Figure of description, the present invention is further illustrated.
As shown in Figure 1, the asynchronous oscillation center localization method based on minimum measurement impedance of the present invention, including it is following
Step,
Step (A), it is equal in the both sides of several grades of circuits of the interconnector of power grid and subordinate according to the grid structure of power grid
Observation point is set, can use subordinate's circuit on 1-4 grades of interconnecting ties road here；
Step (B) calculates the minimum measurement impedance within the asynchronous oscillation period of each observation point, includes the following steps,
(B1), it in each observation point, sets busbar and is directed toward circuit with reference to positive direction, to utilize measurement voltage and measurement electricity
The ratio of stream calculates the measurement impedance of the observation point；
(B2), when asynchronous oscillation occurs for power grid, the measurement impedance of the observation point is drawn out on impedance plane at any time
The geometric locus of variation, and within an asynchronous oscillation period, search out and measure locus of impedance and impedance plane initial point distance most
Close asynchronous oscillation impedance point；
(B3), calculating is directed toward the asynchronous oscillation impedance point from impedance plane origin and is formed by vector impedance, as the sight
Minimum measurement impedance of the measuring point within this asynchronous oscillation period；
(B4), (B1)-(B3) is repeated, calculates the minimum measurement impedance within the asynchronous oscillation period of each observation point；
Step (C) determines asynchronous oscillation center according to the minimum measurement impedance within the asynchronous oscillation period of each observation point
The circuit at place, includes the following steps,
(C1) the minimum of each observation point is drawn on impedance plane measures the corresponding vector of impedance；
(C2) the corresponding vector direction of each minimum measurement impedance is judged, if the minimum corresponding vector of impedance that measures is located at I, IV
When quadrant, the direction of the vector is just；When minimum, which measures the corresponding vector of impedance, is located at II, III quadrant, the direction of the vector
It is negative；
(C3), according to it is each it is minimum measure the corresponding vector direction of impedance, determine the circuit where asynchronous oscillation center, when and
Only when the minimum corresponding vector direction for measuring impedance of the observation point of a certain circuit both sides is timing, asynchronous oscillation center
On this circuit；
(C4), verification asynchronous oscillation center indicates to lose if the minimum direction for measuring impedance of other observation points is timing
Step oscillation center position is located at the reference positive direction of corresponding observation point, i.e. busbar is directed toward the direction of circuit；If others observation
The minimum impedance direction that measures of point is to indicate that asynchronous oscillation center is located at the reference negative direction of observation point, i.e. circuit when bearing
It is directed toward the direction of busbar, foundation is verified with this, whether accurate verifies circuit where determining asynchronous oscillation center；
Step (D), according to the circuit determined where asynchronous oscillation center, positioning asynchronous oscillation center, including following step
Suddenly,
(D1), it calculates the minimum of the circuit both sides observation point where asynchronous oscillation center and measures impedance value and the practical resistance of circuit
The percent value of anti-value can be missed according to the sum of the circuit both sides percent value where asynchronous oscillation center 100 ± 5% here
In poor range, the accuracy of percent value result is verified；
(D2), the percent value per side shows exact position of the asynchronous oscillation center relative to the circuit side point,
It is finally completed the quantitative ranging to asynchronous oscillation center.
Below according to the present invention based on the minimum asynchronous oscillation center localization method for measuring impedance, it is specific to introduce one
Embodiment,
(1) setting of observation point
On interconnecting ties road and subordinate, observation point is arranged in the both sides of what circuit, extends out series and generally can use 1 to 4 grade,
It can select to extend to both sides or side (left or right side) according to the grid structure of power grid, for power grid as shown in Figure 2, power grid
Contact section is made of two interconnectors, and selection extends out 2 to 3 grades to the left, observation point is arranged in circuit both sides, such as Fig. 2 institutes
Show；
(2) minimum to measure impedance computation
With busbar be directed toward circuit be with reference to positive direction, calculate the measurement impedance of each observation point, vector be
It draws out and measures the track that impedance changes over time on impedance plane in an asynchronous oscillation period, as shown in figure 3, from impedance
The vector that plane origin is directed toward closest approach on the track is that minimum measure of the observation point in this asynchronous oscillation period is hindered
It is anti-Theoretically analyze, when the differential seat angle of two side systems at asynchronous oscillation center reaches 180 degree, asynchronous oscillation center
Voltage be 0, the measurement impedance at observation point at this time is the minimum value in cycle of oscillation, as shown in Figure 4.
(3) circuit where determining asynchronous oscillation center
It is the vector on impedance plane that minimum, which measures impedance, according to its angle, judges the positive and negative of minimum measurement impedance：
(3.1) the minimum impedance direction that measures is just
If the minimum corresponding vector of impedance that measures is located at impedance plane I, IV quadrant, minimum measure impedance direction be just,
It is indicated with "+"；It is timing when minimum measures impedance direction, indicates that asynchronous oscillation center is located at the reference pros of observation point
To that is, busbar is directed toward the direction of circuit；
(3.2) the minimum impedance direction that measures is negative
If minimum, which measures the corresponding vector of impedance, is located at impedance plane II, III quadrant, minimum measures impedance direction and is
It bears, is indicated with "-", when it is negative that minimum, which measures impedance direction, the reference that expression asynchronous oscillation center is located at observation point is negative
The direction of busbar is directed toward in direction, i.e. circuit；
When the minimum impedance that asynchronous oscillation center is fallen when power grid is got in touch on section, and each observation point measures in Fig. 1
It direction can be with as shown in figure 5, the minimum comparison for measuring impedance direction within the same asynchronous oscillation period by different observation points
The position for specifying asynchronous oscillation center is located on a certain circuit or on the contact section of a few circuits composition, and if only if
The minimum direction for measuring impedance of a certain circuit both sides observation point is timing, and asynchronous oscillation center is located on the circuit, and
The minimum impedance direction that measures of homonymy observation point in the same direction must be with uniformity, and by taking Fig. 5 as an example, the direction of observation point 5 and 6 is
Just, and the direction of observation point 1 and 3 be just, the direction of observation point 2 and 4 be negative, can determine asynchronous oscillation in this case
Center is located on circuit EH, similarly may determine that asynchronous oscillation center also is located on circuit GI；
(4) positioning asynchronous oscillation center
The size that minimum measures impedance reflects distance of the observation point relative to asynchronous oscillation central electrical distance, works as observation
Where point is located at asynchronous oscillation center when circuit both sides, minimum measures the percent value of impedance value and circuit real impedance values, i.e.,
Give exact position of the asynchronous oscillation center on the circuit.As shown in fig. 6, by taking circuit EH and observation point 5,6 as an example, will see
The minimum of measuring point 5 measures impedance value | ZminE| divided by circuit EH real impedance values | ZEH|, obtain percentage a%, a%=| ZminE
|/|ZEH|, the distance for showing asynchronous oscillation center to the sides E of circuit EH is the a% of total track length；Similarly, by observation point 5
Minimum measures impedance value | ZminH| divided by circuit EH real impedance values | ZEH|, obtain percentage b%, b%=| ZminH|/|ZEH|,
The distance for showing asynchronous oscillation center to the sides H of circuit EH is the b% of total track length；If the sum of a% and b% are 100 ± 5%
In error range, i.e. the accuracy of result of calculation then can be confirmed in a%+b% ≈ 100%, by analysis calculate, that is, provide
Specific location of the asynchronous oscillation center on circuit EH, completes and is accurately positioned to asynchronous oscillation center.
In conclusion the asynchronous oscillation center localization method based on minimum measurement impedance of the present invention, difference observation
Point is minimum to measure impedance magnitude and direction, is accurately positioned asynchronous oscillation center, compared to existing method, can quantify
Provide the change procedure of oscillation center position in the specific location at asynchronous oscillation center, and description different asynchronous oscillation periods；
Impedance is measured as basis for estimation using minimum, improves the adaptability changed to power system operating mode, and step-out is overcome to shake
The anti-interference of trend fluctuation and the unordered action of control device during swinging；Electric system simulation analysis is can be applied to, it is deep
Carve the asynchronous oscillation characteristic for disclosing power grid；Research on configuration and the definite value that can be applied to Out-of-Step Splitting Systems device or Out-of-Step Splitting Systems system are whole
Fixed, formulation is reasonably layouted and setting program；Out-of-Step Splitting Systems device or Out-of-Step Splitting Systems system be can be applied to asynchronous oscillation center
The calculating of position, and track the drift of oscillation center, it is ensured that the correctness of islanding control measure reduces the wind of malfunction and misaction
Danger, has a good application prospect.
The basic principles and main features and advantage of the present invention have been shown and described above.The technical staff of the industry should
Understand, the present invention is not limited to the above embodiments, and the above embodiments and description only describe the originals of the present invention
Reason, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes and improvements
It all fall within the protetion scope of the claimed invention.The claimed scope of the invention is by appended claims and its equivalent circle
It is fixed.
Claims (6)
1. based on the minimum asynchronous oscillation center localization method for measuring impedance, it is characterised in that：Include the following steps,
Step（A）, according to the grid structure of power grid, it is respectively provided in the both sides of several grades of circuits of the interconnector of power grid and subordinate
Observation point；
Step（B）, calculate the minimum measurement impedance within the asynchronous oscillation period of each observation point；
Step（C）, according to the minimum measurement impedance within the asynchronous oscillation period of each observation point, determine asynchronous oscillation center place
Circuit；
Step（D）, according to the circuit determined where asynchronous oscillation center, positioning asynchronous oscillation center.
2. according to claim 1 based on the minimum asynchronous oscillation center localization method for measuring impedance, feature exists
In：Step（A）, several grades of circuits of the subordinate take subordinate's circuit on 1-4 grades of interconnecting ties road.
3. according to claim 1 based on the minimum asynchronous oscillation center localization method for measuring impedance, feature exists
In：Step（B）, the minimum measurement impedance within the asynchronous oscillation period of each observation point is calculated, is included the following steps,
（B1）, in each observation point, set busbar and be directed toward circuit with reference to positive direction, to utilize measurement voltage and measurement electric current
Ratio calculates the measurement impedance of the observation point；
（B2）, when asynchronous oscillation occurs for power grid, the measurement impedance that the observation point is drawn out on impedance plane changes over time
Geometric locus search out that measure locus of impedance and impedance plane initial point distance nearest and within an asynchronous oscillation period
Asynchronous oscillation impedance point；
（B3）, calculating is directed toward the asynchronous oscillation impedance point from impedance plane origin and is formed by vector impedance, as the observation point
Minimum measurement impedance within this asynchronous oscillation period；
（B4）, repeat（B1）-（B3）, calculate the minimum measurement impedance within the asynchronous oscillation period of each observation point.
4. according to claim 1 based on the minimum asynchronous oscillation center localization method for measuring impedance, feature exists
In：Step（C）, according to the minimum measurement impedance within the asynchronous oscillation period of each observation point, determine asynchronous oscillation center place
Circuit, include the following steps,
（C1）The minimum of each observation point is drawn on impedance plane measures the corresponding vector of impedance；
（C2）The corresponding vector direction of each minimum measurement impedance is judged, if the minimum corresponding vector of impedance that measures is located at I, IV quadrant
When, the direction of the vector is just；When minimum, which measures the corresponding vector of impedance, is located at II, III quadrant, the direction of the vector is
It is negative；
（C3）, the corresponding vector direction of impedance is measured according to each minimum, determines the circuit where asynchronous oscillation center, and if only if
The minimum corresponding vector direction for measuring impedance of the observation point of a certain circuit both sides is timing, and asynchronous oscillation center is located at
On this circuit；
（C4）, verification asynchronous oscillation center indicates that step-out is shaken if the minimum direction for measuring impedance of other observation points is timing
The reference positive direction that center is located at corresponding observation point is swung, i.e. busbar is directed toward the direction of circuit；If other observation points
It is to indicate that asynchronous oscillation center is located at the reference negative direction of observation point, i.e. circuit is directed toward when bearing that minimum, which measures impedance direction,
The direction of busbar verifies foundation with this, whether accurate verifies circuit where determining asynchronous oscillation center.
5. according to claim 1 based on the minimum asynchronous oscillation center localization method for measuring impedance, feature exists
In：Step（D）, according to the circuit where asynchronous oscillation center, positioning asynchronous oscillation center includes the following steps,
（D1）, calculate the minimum of the circuit both sides observation point where asynchronous oscillation center and measure impedance value and circuit real impedance values
Percent value；
（D2）, show exact position of the asynchronous oscillation center relative to the circuit side point per the percent value of side, finally
Complete the quantitative ranging to asynchronous oscillation center.
6. according to claim 5 based on the minimum asynchronous oscillation center localization method for measuring impedance, feature exists
In：（D1）, the sum of circuit both sides percent value where asynchronous oscillation center is in 100 ± 5% error ranges, verification hundred
Divide the accuracy of ratio result.
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