CN103163363B - Power grid voltage dropping testing algorithm for dynamic voltage restorer - Google Patents
Power grid voltage dropping testing algorithm for dynamic voltage restorer Download PDFInfo
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- CN103163363B CN103163363B CN201310077059.6A CN201310077059A CN103163363B CN 103163363 B CN103163363 B CN 103163363B CN 201310077059 A CN201310077059 A CN 201310077059A CN 103163363 B CN103163363 B CN 103163363B
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Abstract
The invention provides a power grid voltage dropping testing algorithm for dynamic voltage restorer. The algorithm tests fundamental positive sequence and negative sequence component of the power grid voltage through a recursive sliding window discrete Fourier transformation to calculate practical offset of power grid voltage, and compares with a preset threshold to further judge whether the power grid voltage drops or not. The testing algorithm is fast and has a stronger resistivity to power grid voltage harmonic waves. According to the testing results, the testing algorithm can quickly test symmetrical power grid voltage drop and asymmetric power grid voltage drop, and is not easy to be influenced by harmonic waves.
Description
[technical field]
The present invention relates to dynamic electric voltage recovery device research field, particularly the grid voltage sags detection algorithm of dynamic electric voltage recovery device.
[background technology]
Dynamic electric voltage recovery device (DVR) can available protecting sensitive loads by the impact of grid voltage sags, be widely used in the protection of industry spot electric network fault.Off-line type DVR only puts into operation when grid voltage sags occurs, and is in bypass condition when electrical network is normal, to reduce the loss of system.The input of DVR and cutting out is controlled by Voltage Drop detection algorithm.Therefore, Voltage Drop detection algorithm is one of important component part in DVR control system, and it directly decides the dynamic response performance of DVR.
In recent years, scholar is had to propose to utilize dynamic electric voltage recovery device to realize the low voltage crossing of dual feedback wind power generation system, to meet electrical network Grid-connection standards proposed requirement.Residing for usual wind generator system, region is comparatively remote, multiple access light current net, and therefore fluctuating range is comparatively large under normal circumstances for wind energy turbine set port voltage, and may there is larger voltage harmonic.Realize in the application of wind generator system low voltage crossing at employing DVR, the fluctuation of grid voltage magnitudes and voltage harmonic propose higher requirement to DVR control system especially grid voltage sags detecting portion, quick and precisely detect the generation fallen, and avoid the miscarrying of DVR to enter as far as possible.Found by searching document, in existing document, pay close attention to control and the compensation method of DVR more, to realize the low voltage crossing of wind generator system, and less to the grid voltage sags detection algorithm research under this application scenario.
Existing grid voltage sags detection algorithm is mainly used in the application scenario of protection sensitive loads.According to the requirement of DVR control performance, Voltage Drop detection algorithm should meet rapidity, vulnerability to jamming, the requirement of accuracy and completeness four aspects.The detection of many scholars to Voltage Drop is studied, and proposes corresponding detection algorithm.According to the number of phases, existing detection method can be divided into based on single-phase detection algorithm and the detection algorithm based on three-phase.Based on single-phase detection algorithm, whether judge whether voltage falls lower than 90% ratings by the amplitude (or effective value, peak value) detecting single-phase voltage.Different single-phase detection algorithms is different in the computing method of single-phase voltage amplitude, such as virtual value method, DFT analyzes, 2 or multipoint method, and constructing virtual voltage method, wherein with constructing virtual voltage method response rapidity and vulnerability to jamming best, but when voltage harmonic content is larger, between rapidity and vulnerability to jamming, there is larger contradiction.Based on the detection algorithm of three-phase, distinct methods judges that the detection criteria of Voltage Drop there are differences.Whether detection method based on positive-sequence component amplitude only detects three-phase voltage positive-sequence component amplitude lower than 90% ratings, and the method calculates positive-sequence component by low pass and notch filter, and response speed is limited but its vulnerability to jamming is better.Falling for asymmetrical voltage, there is the problem of check frequency in the method.Another method is electric network voltage phase tracing, and its detection criteria is the degree that virtual voltage DQ component departs from its reference value.The method is by judging whether the effective value of instantaneous bias is greater than the threshold values that presets to detect Voltage Drop.This detection criteria has considered the impact of three-phase voltage positive sequence and negative sequence component, but the relation of it and positive sequence and negative sequence component is nonlinear.
Below provide the pertinent literature of retrieval:
[1]Chris Fitzer,Mike Barnes,and Peter Green,"Voltage sag detectiontechnique for a dynamic voltage restorer,"IEEE Trans on Industry Applicat,vol.40,no.1,pp.203-212,Jan/Feb2004.
[2]Huang Xinming.＂Load voltage regulation by series and unifiedpower quality controller＂,Ph.D.Dissertation,Xi’an Jiaotong University,2009.
[3]A.Teke K.Bayindir M.Tümay.Sag/swell detection method forfuzzy logic controlled dynamic voltage restorer.IET Gener.Transm.Distrib.,vol.4,iss.1,pp.1–12,2010.
[4]Po-Tai Cheng,Chian-Chung Huang,Chun-Chiang Pan et.al"Designand Implementation of a Series Voltage Sag Compensator Under PracticalUtility Conditions,"IEEE Trans.Ind.Applicat.,vol.39,pp.844–853,May/June.2003.
[summary of the invention]
For the weak point existed in above-mentioned existing method, the object of the invention is to propose a kind of grid voltage sags detection algorithm being applicable to dynamic electric voltage recovery device.This detection algorithm can detection of grid Voltage Drop rapidly and accurately, and has good resistivity on Voltage Harmonic not affecting on the basis detecting response performance.
To achieve these goals, the present invention adopts following technical scheme:
Be applicable to the grid voltage sags detection algorithm of dynamic electric voltage recovery device, comprise the following steps:
Step one, by software phase-lock loop, real-time detecting and tracking three-phase power grid voltage signal V
abcfundamental positive sequence phase theta;
Step 2, by rotating coordinate transformation, by three-phase voltage signal V
abcunder being transformed into dq rotating coordinate system by abc rest frame, obtain dq voltage signal
with
Step 3, employing moving window is the recursive discrete Fourier transformation method of 10ms, analyzes respectively
with
dC component amplitude and 2 frequency multiplication AC compounent amplitudes, by signal
analysis can obtain fundamental positive sequence d axle component
with first-harmonic negative sequence component amplitude V
n1, by signal
analysis can obtain fundamental positive sequence q axle component
with first-harmonic negative sequence component amplitude V
n2;
Step 4, obtains step 3 analysis
with
line voltage fundamental positive sequence amplitude V is calculated by formula (1)
p, by V
n1and V
n2line voltage first-harmonic negative sequence component amplitude V is obtained after algebraic mean
n;
Step 5, the signal V calculated by step 4
pand V
n, the offset Δ V of actual electric network voltage is calculated by formula (2);
ΔV=V
P+2V
N（2）
Step 6, by the line voltage offset Δ V of reality compared with the threshold values of setting, when Δ V is greater than the threshold values of setting, judge that line voltage falls, generation trigger pip also latches soft phase-locked loop; When Δ V is less than the threshold values of setting, line voltage falls or recovers, and trigger pip is zero.
As the preferred embodiments of the present invention, in step one, adopt bandwidth lower than the phase theta of the fundamental positive sequence of the soft phase-locked loop tracking three-phase power grid voltage of 50Hz.
As the preferred embodiments of the present invention, in step 2, by rotating coordinate transformation, line voltage fundamental positive sequence becomes DC component, and first-harmonic negative sequence component becomes 2 frequency multiplication AC compounent, and other voltage harmonic becomes the AC compounent of high frequency.
The present invention has following beneficial effect: the present invention adopts moving window to be fundamental positive sequence and the negative sequence component amplitude of the recursive discrete Fourier transformation methods analyst three-phase power grid voltage of 10ms, on the basis ensureing certain rapidity, to Voltage Harmonic, there is stronger resistivity simultaneously; The present invention adopts the linearity criterion in conjunction with fundamental positive sequence and negative sequence component, effectively detects any phase voltage and falls symmetry lower than ratings 90% and asymmetrical voltage Amplitude drop.Can see from simulation result, the present invention can detect all types of grid voltage sags fast and accurately, and has stronger resistivity to Voltage Harmonic disturbance.
[accompanying drawing explanation]
Fig. 1 is the structured flowchart of grid voltage sags detection algorithm in the present invention;
Fig. 2 adopts the recursive discrete Fourier transformation method of 10ms moving window to calculate the fundamental positive sequence of three-phase power grid voltage and the result of negative sequence component; A () figure is three-phase power grid voltage, it falls at 0.06s, returns to pre-fault status after continuing 0.06s; B () figure is the three-phase voltage of DQ rotating coordinate system, DQ voltage exists direct current and AC compounent when asymmetrical voltage falls; C () figure is fundamental positive sequence and the negative sequence component of the three-phase power grid voltage adopting the recursive discrete Fourier transformation method of 10ms moving window to calculate.
The testing process that Fig. 3 is algorithm of the present invention when line voltage symmetry is fallen and result; A () figure is three-phase power grid voltage, three-phase symmetric voltage occurs when 0.06s and falls, and continue 0.06s; B () figure adopts the detection criteria in this algorithm, the DQ voltage deviation amount calculated; C () figure is the trigger pip produced.
Fig. 4 be algorithm of the present invention line voltage is asymmetric fall time testing process and result; A () figure is three-phase power grid voltage, asymmetrical voltage occurs when 0.06s and falls, and continue 0.06s; B () figure adopts the detection criteria in this algorithm, the DQ voltage deviation amount calculated; C () figure is the trigger pip produced.
Fig. 5 is the testing process of algorithm of the present invention when Voltage Harmonic content is larger and result; A () figure is the three-phase power grid voltage containing harmonic wave, asymmetrical voltage occurs when 0.06s and falls, and continue 0.06s; B () figure adopts the detection criteria in this algorithm, the DQ voltage deviation amount calculated, same to Fig. 4 (b) contrasts known, detection computations result no influence from harmonic; C () figure is the trigger pip produced.
[embodiment]
Below in conjunction with accompanying drawing, the present invention is described in further detail.
The present invention proposes the grid voltage sags detection algorithm being applicable to dynamic electric voltage recovery device, and its structured flowchart as shown in Figure 1, comprises the following steps:
Step one, by software phase-lock loop, real-time detecting and tracking three-phase power grid voltage signal V
abcfundamental positive sequence phase theta;
Step 2, by rotating coordinate transformation, by three-phase voltage signal V
abcunder being transformed into dq rotating coordinate system by abc rest frame, obtain dq voltage signal
with
Step 3, employing moving window is the recursive discrete Fourier transformation method of 10ms, analyzes respectively
with
dC component amplitude and 2 frequency multiplication AC compounent amplitudes, by signal
analysis can obtain fundamental positive sequence d axle component
with first-harmonic negative sequence component amplitude V
n1, by signal
analysis can obtain fundamental positive sequence q axle component
with first-harmonic negative sequence component amplitude V
n2;
Step 4, obtains step 3 analysis
with
line voltage fundamental positive sequence amplitude V is calculated by formula (1)
p, by V
n1and V
n2line voltage first-harmonic negative sequence component amplitude V is obtained after algebraic mean
n;
Step 5, the signal V calculated by step 4
pand V
n, the offset Δ V of actual electric network voltage is calculated by formula (2);
ΔV=V
P+2V
N（2）
Step 6, by the line voltage offset Δ V of reality compared with the threshold values of setting, when Δ V is greater than the threshold values of setting, judges that line voltage falls, generation trigger pip locking soft phase-locked loop; When Δ V is less than the threshold values of setting, line voltage falls or recovers, and trigger pip is zero.
In step 3 of the present invention, employing moving window is fundamental positive sequence and the negative sequence component amplitude of the recursive discrete Fourier transformation method calculating three-phase power grid voltage of 10ms, the dynamic process calculated and result are as shown in Figure 2, this method, while guarantee rapidity, has stronger opposing rejection ability to disturbances such as Voltage Harmonic.There is asymmetric falling for line voltage, after Voltage Drop, under rotating coordinate system, in its dq component of voltage, comprise the AC compounent of 2 frequencys multiplication.Adopt the moving window of 10ms, discrete Fourier transformation is carried out to dq component of voltage, calculate DC component amplitude and the 2 frequency multiplication AC compounent amplitudes of dq voltage signal, in necessary situation, also can calculate other order harmonic components amplitude.In theory, the maximum time delay through 10ms, positive sequence and the negative sequence component amplitude of stable state can be obtained.
In step 5, the present invention adopts the linearity criterion in conjunction with fundamental positive sequence and negative phase-sequence amplitude, judges whether line voltage falls, and effectively detects the grid voltage sags fault of any phase voltage Amplitude drop to ratings less than 90%.
Figure 3 shows that the testing process of the present invention when symmetrical grid voltage sags and result.When line voltage generation symmetry is fallen, the actual electric network voltage DQ offset Δ V that detection algorithm of the present invention calculates increases gradually, and when Δ V is greater than setting threshold values, provide trigger pip, dynamic electric voltage recovery device puts into operation, compensation network Voltage Drop.
Figure 4 shows that the testing process of the present invention when unbalanced network voltage falls and result.When there is asymmetric falling in line voltage, testing process is similar, the actual electric network voltage DQ offset Δ V that detection algorithm of the present invention calculates increases gradually, and not containing AC compounent, when Δ V is greater than setting threshold values, provide trigger pip, dynamic electric voltage recovery device puts into operation, compensation network Voltage Drop.
Figure 4 shows that the testing process of the present invention when Voltage Harmonic content is larger and result.Due to the fundamental positive sequence and the negative sequence component amplitude that adopt the discrete Fourier transformation method of recurrence to calculate line voltage in the present invention, the result of calculation impact of voltage harmonic on stable state can be ignored, and therefore algorithm of the present invention has stronger resistivity to voltage harmonic.As shown in the figure, when containing harmonic wave in line voltage, not containing wave components such as harmonic waves in the actual electric network voltage DQ offset Δ V that detection algorithm calculates, when Δ V is greater than setting threshold values, provide trigger pip, dynamic electric voltage recovery device puts into operation, compensation network Voltage Drop.
Give a kind of grid voltage sags detection algorithm being applicable to dynamic electric voltage recovery device in the present invention, and under Matlab/Simulink platform, simulating, verifying has been carried out to this detection algorithm.Can see from the result of emulation, this control method can detection of grid Voltage Drop rapidly and accurately.
Claims (3)
1. be applicable to the grid voltage sags detection algorithm of dynamic electric voltage recovery device, comprise the following steps:
Step one, by software phase-lock loop (PLL), real-time detecting and tracking three-phase power grid voltage signal V
abcfundamental positive sequence phase theta;
Step 2, by rotating coordinate transformation, by three-phase voltage signal V
abcunder being transformed into dq rotating coordinate system by abc rest frame, obtain dq voltage signal
with
Step 3, employing moving window is the recursive discrete Fourier transformation method (RDFT) of 10ms, analyzes respectively
with
dC component amplitude and 2 frequency multiplication AC compounent amplitudes, by signal
analysis can obtain fundamental positive sequence d axle component
with first-harmonic negative sequence component amplitude V
n1, by signal
analysis can obtain fundamental positive sequence q axle component
with first-harmonic negative sequence component amplitude V
n2;
Step 4, obtains step 3 analysis
with
line voltage fundamental positive sequence amplitude V is calculated by formula (1)
p, by V
n1and V
n2line voltage first-harmonic negative sequence component amplitude V is obtained after algebraic mean
n;
Step 5, the signal V calculated by step 4
pand V
n, the offset Δ V of actual electric network voltage is calculated by formula (2);
ΔV=V
P+2V
N（2）
Step 6, by the line voltage offset Δ V of reality compared with the threshold values of setting, when Δ V is greater than the threshold values of setting, judge that line voltage falls, generation trigger pip also latches soft phase-locked loop; When Δ V is less than the threshold values of setting, line voltage falls or recovers, and trigger pip is zero.
2. the grid voltage sags detection algorithm for dynamic electric voltage recovery device according to claim 1, is characterized in that: in step one, adopts bandwidth lower than the phase theta of the fundamental positive sequence of the soft phase-locked loop tracking three-phase power grid voltage of 50Hz.
3. the grid voltage sags detection algorithm for dynamic electric voltage recovery device according to claim 1, it is characterized in that: in step 2, pass through rotating coordinate transformation, line voltage fundamental positive sequence becomes DC component, first-harmonic negative sequence component becomes 2 frequency multiplication AC compounent, and other voltage harmonic becomes the AC compounent of high frequency.
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| KR101493511B1 (en) * | 2013-06-26 | 2015-02-16 | 포스코에너지 주식회사 | An apparatus and a method for controlling an overcurrent of a grid connected inverter according to error of grid voltage |
| CN103414204B (en) * | 2013-07-05 | 2015-08-19 | 思源电气股份有限公司 | Adopt the control method of dynamic voltage compensation wind generator system output reactive power |
| US9535133B2 (en) * | 2013-11-05 | 2017-01-03 | Rockwell Automation Technologies, Inc. | Industrial system phase sag detection |
| CN105116195B (en) * | 2015-07-13 | 2018-07-06 | 中国人民解放军海军工程大学 | Suitable for the big method for detecting voltage drop of Voltage Harmonic content |
| CN107356826A (en) * | 2017-01-10 | 2017-11-17 | 深圳点亮新能源技术有限公司 | A kind of voltage dip detects algorithm |
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