CN104931850A - Voltage dip disturbance source identification method based on voltage space vector - Google Patents
Voltage dip disturbance source identification method based on voltage space vector Download PDFInfo
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Abstract
The invention discloses a voltage dip disturbance source identification method based on a voltage space vector; the method comprises the following steps: converting three-phase voltage into one-dimension time variant complex variable; using DFT to form amplitudes, harmonic waves and phase angle characteristic quantity so as to detect and represent the voltage dip, and identify the disturbance source causing the dip; using three dimensional visualization description of the space vector to specifically represent the whole voltage dip. The method uses less variables in each phase analysis, is small in calculation, easy to realize in engineer, can deeply and systematically analyze and study the voltage dip problems, can further control and manage the voltage dip, thus ensuring qualified power supply for users, improving power quality, and promoting intelligent power grid development, so important reality meaning can be provided.
Description
Technical field
The present invention relates to a kind of voltage Sag Disturbance source identification method, specifically a kind of voltage Sag Disturbance source discrimination method based on space vector of voltage.
Background technology
At present, three-phase voltage is seen as three variable analyses by the voltage Sag Disturbance source discrimination method that oneself has, fall analytical approach temporarily with the automatic analysis in ideal and also have no small gap, the present invention proposes a kind of voltage Sag Disturbance source discrimination method based on space vector of voltage.
Summary of the invention
The object of the present invention is to provide a kind of voltage Sag Disturbance source discrimination method based on space vector of voltage, to solve the problem proposed in above-mentioned background technology.
For achieving the above object, the invention provides following technical scheme:
Based on a voltage Sag Disturbance source discrimination method for space vector of voltage, comprise the following steps:
(1) obtain raw data, comprise three-phase voltage instantaneous value and system frequency;
(2) formula is utilized
(1) space vector conversion is carried out to data, obtain space vector of voltage
and zero-sequence component
x 0 (t);
(3) according to formula
(7) relevant parameter is obtained
r maj,
r minwith
φ inc;
(4) threshold value is set
r min=0.9, utilize first-harmonic parameter to the voltage dip partitioning algorithm being less than threshold value, analyze further, determine countershaft amplitude catastrophe point number;
(5) countershaft amplitude catastrophe point only has the voltage dip caused for motor start-up or transformer excitation of, otherwise, be the voltage dip that fault causes, proceed to step (7);
(6) shape factor S I do not have significant change cause for motor start-up fall temporarily, otherwise, for induction motor starts the voltage dip caused;
(7) further the voltage dip caused by fault is classified, described, judge whether it is falling temporarily of causing of balancing fault by SI, then judge to fall the separate of generation temporarily according to pitch angle, if angle is identical, judge to fall type temporarily according to main shaft and residual voltage.
Compared with prior art, the invention has the beneficial effects as follows: three-phase voltage is transformed into one dimension time become complex variable, DFT is utilized to construct amplitude, harmonic wave and phase angle characteristic quantity can detect voltage dip, characterize and to causing the disturbing source fallen temporarily to carry out identification, the three-dimensional visualization of space vector describes and carries out detailed characterizations to the overall situation of falling temporarily, the each phase analysis of the method variable used is few, calculated amount is little, be easy to Project Realization, to deeply systematically analyzing and study Problem of Voltage Temporary-Drop, further voltage dip controlled and administer, thus ensure the quality supply to user, improve and improve the quality of power supply, promote that the development of intelligent grid has important practical significance.
Accompanying drawing explanation
Fig. 1 is Clark Transformation Graphs in the voltage Sag Disturbance source discrimination method based on space vector of voltage.
Fig. 2 is space vector of voltage complex plane trajectory shape figure in the voltage Sag Disturbance source discrimination method based on space vector of voltage.
Fig. 3 is that in the voltage Sag Disturbance source discrimination method based on space vector of voltage, phase to phase fault causes the rmin variation diagram falling VSV temporarily.
Fig. 4 is that in the voltage Sag Disturbance source discrimination method based on space vector of voltage, phase to phase fault causes the SI variation diagram falling VSV temporarily.
Fig. 5 is the schematic diagram that in the voltage Sag Disturbance source discrimination method based on space vector of voltage, category-A type imbalance is fallen temporarily.
Fig. 6 is the schematic diagram that in the voltage Sag Disturbance source discrimination method based on space vector of voltage, category-B type imbalance is fallen temporarily.
Fig. 7 is the schematic diagram that in the voltage Sag Disturbance source discrimination method based on space vector of voltage, C type imbalance is fallen temporarily.
Fig. 8 is the schematic diagram that in the voltage Sag Disturbance source discrimination method based on space vector of voltage, D type imbalance is fallen temporarily.
Fig. 9 is the schematic diagram that in the voltage Sag Disturbance source discrimination method based on space vector of voltage, E type imbalance is fallen temporarily.
Figure 10 is the schematic diagram that in the voltage Sag Disturbance source discrimination method based on space vector of voltage, F type imbalance is fallen temporarily.
Figure 11 is the schematic diagram that in the voltage Sag Disturbance source discrimination method based on space vector of voltage, G type imbalance is fallen temporarily.
Figure 12 is category-B type voltage dip complex plane trajectory diagram in the voltage Sag Disturbance source discrimination method based on space vector of voltage.
Figure 13 is that in the voltage Sag Disturbance source discrimination method based on space vector of voltage, transformer excitation causes the rmin variation diagram falling VSV temporarily.
Figure 14 is that in the voltage Sag Disturbance source discrimination method based on space vector of voltage, transformer excitation causes the SI variation diagram falling VSV temporarily.
Figure 15 is that in the voltage Sag Disturbance source discrimination method based on space vector of voltage, induction motor startup causes the rmin variation diagram falling VSV temporarily.
Figure 16 is that in the voltage Sag Disturbance source discrimination method based on space vector of voltage, induction motor startup causes the SI variation diagram falling VSV temporarily.
Figure 17 is based on imbalance fault figure corresponding to discrimination method medium dip angle, the voltage Sag Disturbance source φ inc of space vector of voltage.
Figure 18 is voltage dip analogue system figure in the voltage Sag Disturbance source discrimination method based on space vector of voltage.
Figure 19 is fallen oscillogram temporarily by surveying multilevel voltage based on the visual description of voltage dip in the voltage Sag Disturbance source discrimination method of space vector of voltage.
Figure 20 is the visual description elliptical orbit countershaft situation of change figure of voltage dip in the voltage Sag Disturbance source discrimination method based on space vector of voltage.
Figure 21 is the visual description form factor figure of voltage dip in the voltage Sag Disturbance source discrimination method based on space vector of voltage.
Figure 22 is the visual description histogram of voltage dip in the voltage Sag Disturbance source discrimination method based on space vector of voltage.
Figure 23 is the visual description polar plot of voltage dip in the voltage Sag Disturbance source discrimination method based on space vector of voltage.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
In the embodiment of the present invention, refer to Fig. 1, three-phase instance variable transforms in the static orthogonal α β coordinate system of two dimension by Clark conversion:
(1)
Be expressed as vector form:
(2)
(3)
Wherein,
for space vector of voltage,
x 0 (t)for zero-sequence component, coefficient 2/3 makes the amplitude of two transformed coordinate systems remain unchanged.Suppose after in before fault each stage, the voltage fundamental of three-phase system and each harmonic are sinusoidal quantities.Changed by Euler's formula, voltage space-vector decomposition can be become two orthogonal rotational components:
(4)
Wherein
, * represents conjugation, is expressed as further:
(5)
(6)
Described in (4), space vector of voltage is determined by the amplitude of orthogonal two rotational components and initial angle at the track of complex plane.Under normal circumstances, the space vector of three-phase balanced system voltage only has positive sequence rotational component, and its space vector of voltage is at the circle of the track of complex plane to be radius be normal voltage.
If system produces voltage dip because there is imbalance fault, because the amplitude of positive-negative sequence rotational component is unequal, the track of complex plane is oval.As shown in Figure 2, its main shaft, countershaft and pitch angle are defined as follows:
(7)
If three-phase equilibrium occurs fall temporarily, the amplitude of negative sequence component is zero,
r min=
r maj, its space vector of voltage is the circle that radius is less than normal voltage at the track of complex plane.When the amplitude of positive-negative sequence component is identical,
r min=0, corresponding track is straight line.In order to the track of space vector of voltage simply can be described, introduce shape factor S I (shape index):
(8)
The voltage dip that short trouble causes all has the sudden change of amplitude in beginning and finish time, and simultaneously usually can with larger phase hit.For single-phase or phase to phase fault, healthy phases also there will be certain amplitude drop.In addition, the change of the system architecture that the change of fault type or relay protection action cause, meeting and then cause multilevel voltage to fall temporarily.The voltage dip caused by fault is comparatively dark, and amplitude is generally lower than 0.7pu.The voltage dip space vector of voltage that Fig. 3-4 causes for phase to phase fault
r minthe simulation result changed with SI.
As shown in Figure 11-Figure 5, falling temporarily of being caused by short trouble is divided into 7 types.Wherein fall category-A type, category-B type, C type and E type to be temporarily four kinds and to fall type substantially temporarily and caused by three-phase shortcircuit, single-phase short circuit, phase fault and double earthfault respectively; D type is caused through the transmission of transformer by category-B type or C type; F type and G type are caused by the transmission of E type through transformer.Parameter
drepresent temporary drawdown degree, according to there is the more serious separate number of voltage dip, be divided into single-phase (category-B type, D type, F type) falls temporarily, two-phase falls (C type, E type, G type) temporarily and three-phase falls (category-A type) temporarily.
What different faults type caused falls temporarily, and its VSV characteristic quantity is different.The category-B type broken down with a phase reduces to example temporarily:
(9)
Euler's formula conversion is carried out to (9), utilizes formula (2) and (3) to obtain:
(10)
Can be obtained by formula (7):
r maj=V
，r min=(1-2/3d)V
，φ inc =π/2
Its space vector of voltage at the track of complex plane as shown in Figure 12 (a).When b phase, with c phase, voltage dip occurs, track is as Figure 12 (b) and 12 (c), and principal axis of ellipse is identical with countershaft size, only pitch angle
φ incdifferent.
The various parameters of falling type temporarily caused by fault utilizing space vector of voltage to represent are in table 1.D in table in d and Fig. 5-11 is identical, all represents temporary drawdown degree; N represents separate: during single-phase fault, n represents fault phase, and during phase to phase fault, n represents healthy phases, and separate a, b, c correspondence 1,2,3 respectively.
Table 1 different faults causes the space vector feature of voltage dip
Due to harmonic influence, the voltage dip space vector of voltage that transformer excitation causes
r minthe simulation result changed with SI as illustrated in figs. 13-14, because when transformer puts into operation, three-phase voltage initial phase angle differs 120 all the time
oasymmetric with positive-negative half-cycle, thus transformer excitation cause fall temporarily while can form larger harmonic component, and three-phase temporary range of decrease value is unbalanced all the time.Its voltage dip degree is relevant with network damping with the remanent magnetism in switch closing moment, iron core, and voltage dip amplitude is not less than 0.85pu.According to actual tests the data obtained, in the voltage dip waveform that transformer excitation produces, there are a large amount of secondaries, three times and four-time harmonic.
Figure 15-16 starts the voltage dip space vector of voltage caused for induction motor
r minthe simulation result changed with SI, the starting current of induction motor, close to 5 ~ 10 times during its steady-state operation, can cause voltage dip.Starting current is greatly the basic reason causing voltage dip, but it is not the determinative of voltage dip degree, the degree of voltage dip is also relevant with the capacity of induction motor, higher level's transformer capacity, the factor such as Starting mode and load, and voltage dip amplitude is not less than 0.8pu.Because it is balanced load, the voltage dip three-phase basis equalization caused.Voltage recovers gradually along with starting current, and therefore such voltage dip only has an amplitude sudden change.
Based on a voltage Sag Disturbance source discrimination method for space vector of voltage, comprise the following steps:
(1) obtain raw data, comprise three-phase voltage instantaneous value and system frequency;
(2) utilize formula (1) to carry out space vector conversion to data, obtain space vector of voltage
and zero-sequence component
x 0 (t);
(3) relevant parameter is obtained according to formula (7)
r maj,
r minwith
φ inc;
(4) threshold value is set
r min=0.9, utilize first-harmonic parameter to the voltage dip partitioning algorithm being less than threshold value, analyze further, determine countershaft amplitude catastrophe point number;
(5) countershaft amplitude catastrophe point only has the voltage dip caused for motor start-up or transformer excitation of, otherwise, be the voltage dip that fault causes, proceed to step (7);
(6) shape factor S I do not have significant change cause for motor start-up fall temporarily, otherwise, for induction motor starts the voltage dip caused;
(7) further the voltage dip caused by fault is classified, described, judge whether it is falling temporarily of causing of balancing fault by SI, then judge to fall the separate of generation temporarily according to pitch angle, if angle is identical, judge to fall type temporarily according to main shaft and residual voltage;
As shown in figure 17, imbalance is fallen temporarily, pitch angle
φ incthat can determine to occur to fall temporarily is specifically separate.S (single) represents single-phase, and D (double) represents two-phase.
The analogue system set up under Matlab/Simulink as shown in figure 18.Electric pressure is configured to 110/10.5/0.38 kV.Load is invariable power model, and idle is that perception is idle, and power factor is 0.9.Transformer T1, T2 adopt the wiring of Yn/Y type, and T3, T4 adopt the Y/Y type mode of connection, and T2 considers the iron core cutter characteristic of transformer.On circuit, F represents trouble spot; K1, K2 represent threephase switch; The M of load end represents induction motor (PN=15kW turns, and rotating speed is 1460r/min), and voltage waveform data adopts the M1 measurement point to low-pressure side (0.4 kV).
By changing the parameters simulation three class voltage dip situation of analogue system, for short trouble, change the size of abort situation, line load, fault initial time and transition resistance; Induction motor is started, changes Startup time, line load and higher level's transformer capacity; Transformer T2 is put into operation, changes put into operation moment, line load and transformer capacity, obtain three class voltage dips totally 400 sample datas respectively.Can find out that the identification method accuracy rate of falling source temporarily that the present invention proposes meets the identification requirement in voltage Sag Disturbance source completely from the simulation result of table 2.
Table 3 simulation result
In order to describe in more detail the overall process of falling temporarily, the track of space vector of voltage at complex plane is represented with 3-D effect over time.As shown in figure 19, voltage signal is unbalanced three-phase voltage sag at the beginning, and the continuation change along with voltage develops into balance gradually and falls temporarily.As shown in figure 20, the countershaft of space vector is divided into four-stage by three amplitude change points, known cause for short trouble multistagely to fall temporarily.
Further analysis can be obtained by DFT, falls the first stage temporarily, and SI=0.78 can be judged as non-equilibriumly falling temporarily, and positive and negative rotational component is respectively
with
,
φ inc=88
o, contrast Figure 17 known generation fall temporarily separate be a,
x 0 (t)=0, main shaft countershaft is respectively
r maj=1pu and
r min=0.78pu, to sum up can judge that falling type is temporarily B, temporary range of decrease value is 0.33pu.Fall subordinate phase temporarily, SI=1 can be judged as that three-phase equilibrium is fallen temporarily,
r maj=
r min =0.5pu, falling type is temporarily A, and temporary range of decrease value is 0.5pu.
As shown in figs. 22-23, the change procedure fallen temporarily and the order of severity of falling temporarily can be understood intuitively.Polar plot medium dip angle is nearly 90
oellipse and radius be the correctness that the circle of 0.5pu demonstrates above-mentioned analytical approach.
To those skilled in the art, obviously the invention is not restricted to the details of above-mentioned one exemplary embodiment, and when not deviating from spirit of the present invention or essential characteristic, the present invention can be realized in other specific forms.Therefore, no matter from which point, all should embodiment be regarded as exemplary, and be nonrestrictive, scope of the present invention is limited by claims instead of above-mentioned explanation, and all changes be therefore intended in the implication of the equivalency by dropping on claim and scope are included in the present invention.Any Reference numeral in claim should be considered as the claim involved by limiting.
In addition, be to be understood that, although this instructions is described according to embodiment, but not each embodiment only comprises an independently technical scheme, this narrating mode of instructions is only for clarity sake, those skilled in the art should by instructions integrally, and the technical scheme in each embodiment also through appropriately combined, can form other the enforcement sides that it will be appreciated by those skilled in the art that.
Claims (1)
1., based on a voltage Sag Disturbance source discrimination method for space vector of voltage, it is characterized in that, comprise the following steps:
(1) obtain raw data, comprise three-phase voltage instantaneous value and system frequency;
(2) formula is utilized
(1) space vector conversion is carried out to data, obtain space vector of voltage
and zero-sequence component
x 0 (t);
(3) according to formula
(7) relevant parameter is obtained
r maj,
r minwith
φ inc;
(4) threshold value is set
r min=0.9, utilize first-harmonic parameter to the voltage dip partitioning algorithm being less than threshold value, analyze further, determine countershaft amplitude catastrophe point number;
(5) countershaft amplitude catastrophe point only has the voltage dip caused for motor start-up or transformer excitation of, otherwise, be the voltage dip that fault causes, proceed to step (7);
(6) shape factor S I do not have significant change cause for motor start-up fall temporarily, otherwise, for induction motor starts the voltage dip caused;
(7) further the voltage dip caused by fault is classified, described, judge whether it is falling temporarily of causing of balancing fault by SI, then judge to fall the separate of generation temporarily according to pitch angle, if angle is identical, judge to fall type temporarily according to main shaft and residual voltage.
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| CN107436396A (en) * | 2017-09-05 | 2017-12-05 | 南方电网科学研究院有限责任公司 | A kind of discrimination method for the electrical network weak link for considering voltage dip |
| CN109188081A (en) * | 2018-09-12 | 2019-01-11 | 四川大学 | A kind of voltage dip waveform point detecting method based on space vector method |
| CN109521305A (en) * | 2018-12-29 | 2019-03-26 | 广东电网有限责任公司 | A kind of electrical energy power quality disturbance incident visualization method and device |
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