CN105429304B - The method being monitored to the harmonic source of power grid - Google Patents
The method being monitored to the harmonic source of power grid Download PDFInfo
- Publication number
- CN105429304B CN105429304B CN201511026851.4A CN201511026851A CN105429304B CN 105429304 B CN105429304 B CN 105429304B CN 201511026851 A CN201511026851 A CN 201511026851A CN 105429304 B CN105429304 B CN 105429304B
- Authority
- CN
- China
- Prior art keywords
- harmonic
- source
- current
- voltage
- harmonic source
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000001914 filtration Methods 0.000 claims abstract description 18
- 238000004458 analytical method Methods 0.000 claims abstract description 10
- 238000012544 monitoring process Methods 0.000 claims description 14
- 238000004040 coloring Methods 0.000 claims description 12
- 238000010891 electric arc Methods 0.000 claims description 11
- 238000010248 power generation Methods 0.000 claims description 6
- 238000004364 calculation method Methods 0.000 claims description 4
- 230000003137 locomotive effect Effects 0.000 claims description 4
- 238000013459 approach Methods 0.000 description 7
- 238000005096 rolling process Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 201000010099 disease Diseases 0.000 description 5
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000000750 progressive effect Effects 0.000 description 2
- 230000002194 synthesizing effect Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00001—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by the display of information or by user interaction, e.g. supervisory control and data acquisition systems [SCADA] or graphical user interfaces [GUI]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/40—Display of information, e.g. of data or controls
Landscapes
- Engineering & Computer Science (AREA)
- Human Computer Interaction (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a kind of method that harmonic source to power grid is monitored, the harmonic data including obtaining all typical harmonic waves of network system；The position of each typical harmonic source access electric system is shown on geographical map, and monitors the voltage and current of each harmonic source；Harmonic source analysis is carried out to the voltage and current of each harmonic source；According to national standard, harmonic source according to harmonic wave state is classified, is coloured and real-time display；Exceeded harmonic source is especially marked, common filtering method and specific filtering parameter are labeled.Present invention acquisition power grid typical harmonic source parameter is simultaneously analyzed and calculated, and is carried out classification display and early warning to harmonic source according to standard, is provided corresponding warning for exceeded harmonic source, while provide the parameter of corresponding filtering method and wave filter.The method of the present invention is clear, comprehensively mains by harmonics source state is monitored, analyzed, shown and alarmed, and carries out certain filtering to harmonic source and instruct, and method is simple, efficient and reliable.
Description
Technical Field
The invention belongs to the field of power system automation, and particularly relates to a method for monitoring a harmonic source of a power grid.
Background
With the development of national economic technology and the increasing improvement of the living standard of people, the electric energy consumption of the electric power system is gradually increased. At present, the power generation system in China still mainly uses thermal power generation which uses coal as an energy source.
With the continuous consumption of fossil energy and the increasing awareness of people on environmental protection, new clean energy represented by wind energy and solar energy plays an increasingly important role in the whole energy consumption. Due to wind energy, solar energy and time variation, a large amount of harmonic waves are inevitably generated in the power generation process of the clean energy, and the harmonic wave problem caused by the clean energy to a power system cannot be ignored along with the continuous increase of the installed capacity of the clean energy. A large number of nonlinear loads, such as traction locomotives, electric arc furnaces, rolling mills, etc., are present in the power system at the same time, and these nonlinear loads also inject a large number of harmonics into the power system. On the other hand, harmonics also cause problems of electrical energy quality such as voltage fluctuations and flicker.
At present, although a power grid has a plurality of harmonic sources, operators can only monitor a single power grid harmonic source in real time; meanwhile, if the harmonic of the power grid is over-limited to alarm, operators cannot quickly judge the main source of the harmonic of the power grid, so that emergency treatment cannot be quickly carried out on the harmonic source; for a harmonic source causing the power grid harmonic wave to exceed the standard, if the harmonic source is not quickly positioned and processed, the power grid harmonic wave exceeding the standard may cause further faults of the power grid, so that the reliability of power supply of the power grid is influenced.
Disclosure of Invention
The invention aims to provide a method for monitoring a harmonic source of a power grid, which can clearly and comprehensively monitor and display the harmonic state of the harmonic source of the power grid and can accurately position and filter and guide the harmonic source.
The method for monitoring the harmonic source of the power grid, provided by the invention, comprises the following steps:
s1, acquiring harmonic data of all typical harmonic sources in a power grid monitoring system;
s2, displaying the positions of the typical harmonic sources, which are accessed to the power system, on a geographical map based on a geographical information system, and monitoring the voltage and the current of each harmonic source in real time;
s3, performing harmonic source analysis on the voltage and current of each harmonic source obtained in the step S2;
s4, aiming at the harmonic source analysis result in the step S3, grading and coloring the harmonic source according to the state harmonic standard and the voltage level of the harmonic source, and displaying the harmonic source on a geographical map in real time;
s5, aiming at the harmonic source analysis result in the step S3, specially marking the overproof harmonic source on the geographic map, and marking a common filtering method and specific filtering parameters on the geographic map near the harmonic source.
And S2, typical harmonic sources comprise a wind power plant, photovoltaic grid-connected power generation, an electric locomotive, a rolling mill load and an electric arc furnace.
And S4, grading and coloring the harmonic source according to the harmonic state, wherein the grading and coloring are respectively carried out on the harmonic voltage and the harmonic current of the harmonic source.
The method for grading and coloring the harmonic voltage of the harmonic source comprises the following steps:
1) If the voltage total harmonic distortion rate of the harmonic source is less than 50% of the maximum value specified by the standard, the harmonic voltage grade of the harmonic source is excellent;
2) If the voltage total harmonic distortion rate of the harmonic source is between 50% and 75% of the standard specified maximum value, the harmonic voltage level of the harmonic source is good;
3) If the total harmonic distortion rate of the voltage of the harmonic source is between 75% and 100% of the maximum value specified by the standard, the harmonic voltage grade of the harmonic source is qualified;
4) If the voltage total harmonic distortion rate of the harmonic source is between 100% and 150% of the standard specified maximum value, the harmonic voltage level of the harmonic source is out of standard.
5) If the total harmonic distortion rate of the voltage of the harmonic source is between 150% and 200% of the standard specified maximum, the harmonic voltage level of the harmonic source is severe.
6) If the voltage total harmonic distortion of a harmonic source is greater than 200% of the maximum value specified by the standard, the harmonic voltage level of the harmonic source is extremely severe.
The method for grading and coloring the harmonic current of the harmonic source comprises the following steps:
1) Converting the measured current values of the harmonics to be under the reference short circuit capacity;
2) If the current value of each harmonic of the harmonic source is less than 50% of the standard allowable value, the harmonic current level of the harmonic source is optimal;
3) If the current value of each harmonic wave of the harmonic wave source is less than 75% of the standard allowable value, but the current of a certain harmonic wave is greater than 50% of the allowable value, the harmonic wave current level of the harmonic wave source is good;
4) If the current value of each harmonic wave of the harmonic wave source is less than 100% of the standard allowable value, but the current of a certain harmonic wave is greater than 75% of the allowable value, the harmonic wave current level of the harmonic wave source is qualified;
5) If the current value of each harmonic of the harmonic source is less than 150% of the standard allowable value, but the current of a certain harmonic is greater than 100% of the allowable value, the harmonic current level of the harmonic source is overproof;
6) If the current value of each harmonic of the harmonic source is less than 200% of the standard allowable value, but the current of a certain harmonic is greater than 150% of the allowable value, the harmonic current level of the harmonic source is serious;
7) If a harmonic source has a certain harmonic current greater than 200% of the standard allowable value, the harmonic current level of the harmonic source is extremely severe.
In the filtering method in step S5, the filtering method is a method that combines an n-order single-tuned filter and a high-pass filter.
The filtering parameters of the filtering method in step S5 specifically include the following steps:
1) Calculating the calculation parameters of the n-time single-tuned filter, comprising:
(1) determining the measured values of the bus voltage and the n-th harmonic current value;
(2) the minimum capacitance C is calculated as follows (n)min
In the formula of omega 1 Is the fundamental angular frequency; u shape 1 Is the bus voltage, I n Is the measured value of the current value of n harmonics, and n is the harmonic frequency;
(3) the inductor parameter L is calculated as follows:
in the formula, epsilon is the partial resonance rate and is generally 0.015;
(4) calculating a resistor parameter R as follows;
in the formula Q f The quality factor is generally 15-80;
2) Calculating the main parameters of the high-pass filter, including:
(1) the cut-off frequency of the high-pass filter is selected to be n +2 times;
(2) the capacitance C of the high-pass filter is calculated as follows (min) ；
C (min) ＝C * (min) C (n)min
In the formula I i Is the i-th harmonic current value, C * (min) Is a per unit value of the capacitance;
(3) calculating the resistance value R of the high-pass filter according to the following formula;
(4) calculating the inductance value L1 of the high-pass filter according to the following formula;
L1＝mR 2 C( min )
wherein m is a parameter related to the quality factor, and the corresponding value is between 0.5 and 2.
The method collects the voltage and current values of a typical harmonic source in the power grid, analyzes and calculates the voltage and current values of the harmonic source, performs hierarchical display, early warning and positioning on the harmonic voltage and the harmonic current of the harmonic source according to national grid standards, gives corresponding warning for the harmonic source exceeding the standard, and simultaneously gives corresponding filtering methods and parameter design of a filter. The method can clearly and comprehensively monitor, analyze, display, position and alarm the state of the harmonic source of the power grid, can guide the harmonic source to filter to a certain extent, and is simple, efficient and reliable.
Drawings
FIG. 1 is a flow chart of the method of the present invention.
Fig. 2 is a schematic diagram of a single tuned filter circuit of the present invention.
Fig. 3 is a schematic diagram of a high pass filter circuit of the present invention.
FIG. 4 is a diagram illustrating harmonic voltage conditions according to an embodiment of the present invention.
FIG. 5 is a diagram illustrating harmonic current conditions according to an embodiment of the present invention.
Detailed Description
As shown in fig. 1, is a flow chart of the method of the present invention: the method for monitoring the harmonic source of the power grid comprises the following steps:
s1, acquiring harmonic data of all typical harmonic sources in a power grid monitoring system;
s2, displaying the positions of the typical harmonic sources, which are accessed to the power system, on a geographical map based on a geographical information system, and monitoring the voltage and the current of each harmonic source in real time;
the typical harmonic source comprises a wind power plant, photovoltaic grid-connected power generation, an electric locomotive, a rolling mill load and an electric arc furnace
S3, performing harmonic source analysis on the voltage and current of each harmonic source acquired in the step S2;
s4, aiming at the harmonic source analysis result in the step S3, grading and coloring the harmonic source according to the state harmonic standard and the voltage level of the harmonic source, and displaying the harmonic source on a geographical map in real time;
the harmonic source is graded and colored according to the harmonic state, and the grading and the coloring are respectively carried out on the harmonic voltage and the harmonic current of the harmonic source.
Grading and coloring a harmonic voltage of a harmonic source, comprising:
1) If the voltage total harmonic distortion rate of the harmonic source is less than 50% of the maximum value specified by the standard, the harmonic voltage grade of the harmonic source is excellent;
2) If the voltage total harmonic distortion rate of the harmonic source is between 50% and 75% of the standard specified maximum value, the harmonic voltage level of the harmonic source is good;
3) If the voltage total harmonic distortion rate of the harmonic source is between 75% and 100% of the maximum value specified by the standard, the harmonic voltage grade of the harmonic source is qualified;
4) If the voltage total harmonic distortion rate of the harmonic source is between 100% and 150% of the standard specified maximum value, the harmonic voltage level of the harmonic source is out of standard.
5) The harmonic voltage level of the harmonic source is severe if the total harmonic distortion rate of the voltage of the harmonic source is between 150% and 200% of the standard-specified maximum value.
6) If the voltage total harmonic distortion of a harmonic source is greater than 200% of the maximum value specified by the standard, the harmonic voltage level of the harmonic source is extremely severe.
Grading and coloring a harmonic current of a harmonic source, comprising:
1) Converting the measured current values of the harmonics to be under the reference short circuit capacity;
2) If the current value of each harmonic wave of the harmonic wave source is less than 50% of the standard allowable value, the harmonic wave current level of the harmonic wave source is optimal;
3) If the current value of each harmonic of the harmonic source is less than 75% of the standard allowable value, but the current of a certain harmonic is greater than 50% of the allowable value, the harmonic current level of the harmonic source is good;
4) If the current value of each harmonic of the harmonic source is less than 100% of the standard allowable value, but the current of a certain harmonic is greater than 75% of the allowable value, the harmonic current level of the harmonic source is qualified;
5) If the current value of each harmonic of the harmonic source is less than 150% of the standard allowable value, but the current of a certain harmonic is greater than 100% of the allowable value, the harmonic current level of the harmonic source is overproof;
6) If the current value of each harmonic of the harmonic source is less than 200% of the standard allowable value, but the current of a certain harmonic is greater than 150% of the allowable value, the harmonic current level of the harmonic source is serious;
7) If a harmonic source has a certain harmonic current greater than 200% of the standard allowable value, the harmonic current level of the harmonic source is extremely severe.
S5, aiming at the harmonic source analysis result in the step S3, specially marking the overproof harmonic source on the geographical map, and marking the common filtering method, such as a method of combining the n-time single-tuned filter and the high-pass filter, and the specific filtering parameters on the geographical map near the harmonic source.
The circuit schematic of the single tuned filter is shown in fig. 2 and the circuit schematic of the high pass filter is shown in fig. 3.
When the filtering method of combining the single-tuned filter and the high-pass filter for n times is adopted, the calculation process of the parameters of the filter is as follows:
1) Calculating the calculation parameters of the n-time single-tuned filter, comprising:
(1) determining the measured values of the bus voltage and the n-th harmonic current value;
(2) the minimum capacitance C is calculated as follows (n)min
In the formula of omega 1 Is the fundamental angular frequency; u shape 1 Is the bus voltage, I n Is the measured value of the current value of n harmonics, and n is the harmonic frequency;
(3) the inductor parameter L is calculated as follows:
in the formula, epsilon is the partial resonance rate and is generally 0.015;
(4) calculating a resistor parameter R as follows;
in the formula Q f The quality factor is generally 15 to 80;
2) Calculating the main parameters of the high-pass filter, including:
(1) the cut-off frequency of the high-pass filter is selected to be n +2 times;
(2) the capacitance C of the high-pass filter is calculated as follows (min) ；
C (min) ＝C * (min) C (n)min
In the formula I i Is the i-th harmonic current value, C * (min) Is a per unit value of the capacitance;
(3) calculating the resistance value R of the high-pass filter according to the following formula;
(4) calculating the inductance value L1 of the high-pass filter according to the following formula;
L1＝mR 2 C (min)
wherein m is a parameter related to the quality factor, and the corresponding value is between 0.5 and 2.
The process of the invention is further illustrated below with reference to a specific example:
suppose that a certain area mainly comprises 5 typical harmonic sources such as a wind power plant, a traction substation, an electric arc furnace, a steel mill and a photovoltaic power station, the voltage levels of the harmonic sources are all 110kV, and the harmonic voltage and current conditions at a certain moment tested by a harmonic source grid-connected measuring point are shown in tables 1 and 2.
TABLE 1 harmonic source harmonic voltage situation in certain area
| Harmonic source type | Total harmonic distortion of voltage |
| Wind farm 1 | 1.2％ |
| Wind farm 2 | 2.5％ |
| Traction substation | 5％ |
| Electric arc furnace 1 | 1.8％ |
| Electric arc furnace 2 | 3.5％ |
| Rolling mill | 4.3％ |
| Photovoltaic power station | 1.7％ |
TABLE 2 harmonic source harmonic current situation in certain area (all converted to reference capacity)
And displaying a plane map of the area based on a GIS technology, and marking the positions of access points of the typical harmonic source power systems on the map. Different harmonic sources are displayed on the map by adopting different appearance graphs, and the specific corresponding mode is shown in table 3.
TABLE 3 appearance of different harmonic sources
And dynamically displaying the harmonic voltage and the current grade of each harmonic source on a map in real time according to different voltage grades. And classifying the harmonic voltage and current grades by adopting national standard limit values. The division rule is as follows:
high quality: <50% Limit
Good: 50% -75% limit
Approaching a limit value: limit of 75% -100%
Taking the 110kV voltage class as an example, the voltage total harmonic distortion limit is 2.0% for the voltage harmonics. It was classified into 3 classes, and the classification results are shown in table 4.
TABLE 4 harmonic Voltage grading
| Total harmonic distortion of voltage | <1％ | 1％～1.5％ | 1.5％～2％ |
| Harmonic voltage class | High quality | Good effect | Approach to the limit |
The allowable value of the harmonic current is different for each current harmonic, and is 12A when the reference capacity is 750MVA, taking 2 harmonic current as an example. It was classified into 3 classes and the classification results are shown in table 5.
TABLE 5 harmonic current grading
| Current value of 2 th harmonic | <6A | 6A～9A | 9A～12A |
| Harmonic current class | High quality | Good effect | Approach to the limit |
For other subharmonic currents, a similar division method is employed. And (4) synthesizing the current grades of the harmonic waves, and taking the worst grade to reflect the overall situation.
Through harmonic voltage and current grade division, for harmonic sources which do not exceed the standard, different harmonic grades are replaced by progressive filling of different grays, and a display pattern is shown in table 6 by taking the harmonic sources of the wind power plant as an example.
TABLE 6 wind farm harmonic ranking display Pattern
For harmonic sources exceeding the national regulation allowance value, threshold value warning is carried out on the map by gradual filling of white, grey and black. According to the exceeding condition, the data are respectively divided into standard exceeding, serious exceeding and serious exceeding, and the division rule is as follows:
exceeding the standard: limit value of 100% -150%
Severe: limit of 150% -200%
Extremely severe: >200% limit
Taking the 110KV voltage class as an example, the voltage total harmonic distortion limit is 2.0% for the voltage harmonics. The portions exceeding the limit values were classified into 3 ranks, and the classification results are shown in table 7.
TABLE 7 harmonic Voltage grading
| Total harmonic distortion of voltage | 2％～3％ | 3％～4％ | >4％ |
| Harmonic voltage class | Out of limits | Severe severity of disease | Is extremely serious |
The allowable value of the harmonic current is different for each current harmonic, and is 12A when the reference capacity is 750MVA, taking 2 harmonic current as an example. The portions exceeding the limit values were classified into 3 ranks, and the classification results are shown in table 8.
TABLE 8 harmonic current grading
| Current value of 2 th harmonic | 12A～18A | 18A～24A | >24A |
| Harmonic current class | Out of standard | Severe severity of disease | Is extremely serious |
For other subharmonic currents, a similar division method is employed. And (4) synthesizing the current grades of the harmonic waves, and taking the worst grade to reflect the overall situation.
Through harmonic voltage and current grade division, for superstandard harmonic sources, different harmonic grades are replaced by different gray-black progressive filling, and a display pattern is shown in table 9 by taking a wind power plant harmonic source as an example.
TABLE 9 wind farm harmonic ranking display Pattern
The result of the harmonic ranking of each harmonic source for the above regions is shown in table 10.
TABLE 10 harmonic source harmonic conditions in a region
| Harmonic source type | Total harmonic distortion of voltage | Total distortion of current harmonics |
| Wind farm 1 | Good effect | Approach to the limit |
| Wind farm 2 | Out of limits | Severe severity of disease |
| Traction substation | Is extremely serious | Severe severity of disease |
| Electric arc furnace 1 | Approach to the limit | Approach to the limit |
| Electric arc furnace 2 | Severe severity of disease | Is extremely serious |
| Rolling mill | Is extremely serious | Is extremely serious |
| Photovoltaic power station | Approach to the limit | Approach to the limit |
According to the division result, voltage harmonic and current harmonic waves of the wind power plant 2, the traction substation and the electric arc furnace 2 are all out of limit, and a black or partial black filling mode is needed to carry out threshold value warning. The voltage and current harmonic situation diagrams are shown in fig. 4 and fig. 5, respectively, for the above division results.
According to the display result, the voltage harmonic and current harmonic of the wind power plant 2, the traction substation and the arc furnace 2 are all out of limit, and a common filter matching scheme needs to be integrated in the display pattern. The wind power plant 2 recommends 5, 7 times of single-tuned filter and high-pass filter combination, the traction substation recommends 3, 5, 7 times of single-tuned filter and high-pass filter combination, the electric arc furnace 2 recommends 3, 5, 7 times of single-tuned filter combination, and the rolling mill recommends 3, 5, 7, 11, 13 times of single-tuned filter combination.
Claims (3)
1. A method of monitoring a harmonic source of an electrical grid, comprising the steps of:
s1, acquiring harmonic data of all typical harmonic sources in a power grid monitoring system;
s2, displaying the positions of the typical harmonic sources, which are accessed to the power system, on a geographical map based on a geographical information system, and monitoring the voltage and the current of the harmonic sources in real time;
s3, performing harmonic source analysis on the voltage and current of each harmonic source obtained in the step S2;
s4, aiming at the harmonic source analysis result in the step S3, respectively grading and coloring the harmonic voltage and the harmonic current of the harmonic source according to the national harmonic standard and the voltage grade of the harmonic source, and displaying the harmonic voltage and the harmonic current on a geographical map in real time according to the following rules:
the rule for grading and coloring the harmonic voltage of the harmonic source is as follows:
(1) If the voltage total harmonic distortion rate of the harmonic source is less than 50% of the maximum value specified by the standard, the harmonic voltage grade of the harmonic source is excellent;
(2) If the voltage total harmonic distortion rate of the harmonic source is between 50% and 75% of the standard specified maximum value, the harmonic voltage level of the harmonic source is good;
(3) If the voltage total harmonic distortion rate of the harmonic source is between 75% and 100% of the maximum value specified by the standard, the harmonic voltage grade of the harmonic source is qualified;
(4) If the voltage total harmonic distortion rate of the harmonic source is between 100% and 150% of the maximum value specified by the standard, the harmonic voltage level of the harmonic source is overproof;
(5) If the voltage total harmonic distortion rate of the harmonic source is between 150% and 200% of the standard specified maximum value, the harmonic voltage level of the harmonic source is severe;
(6) If the total harmonic distortion rate of the voltage of the harmonic source is greater than 200% of the maximum value specified by the standard, the harmonic voltage level of the harmonic source is extremely serious;
the rule for grading and coloring the harmonic current of the harmonic source is as follows:
converting the measured current values of the harmonics to be under the reference short-circuit capacity;
if the current value of each harmonic wave of the harmonic wave source is less than 50% of the standard allowable value, the harmonic wave current grade of the harmonic wave source is excellent;
if the current value of each harmonic of the harmonic source is less than 75% of the standard allowable value, but certain harmonic current is greater than 50% of the allowable value, the harmonic current level of the harmonic source is good;
if the current value of each harmonic of the harmonic source is smaller than 100% of the standard allowable value, but certain harmonic current is larger than 75% of the allowable value, the harmonic current level of the harmonic source is qualified;
if the current value of each harmonic of the harmonic source is smaller than 150% of the standard allowable value, but the current of a certain harmonic is larger than 100% of the allowable value, the harmonic current level of the harmonic source is out of standard;
if the current value of each harmonic wave of the harmonic wave source is smaller than 200% of the standard allowable value, but the current of a certain harmonic wave is larger than 150% of the allowable value, the level of the harmonic wave current of the harmonic wave source is serious;
vii. If a harmonic source has a certain harmonic current greater than 200% of the standard allowed value, the harmonic current level of the harmonic source is extremely severe;
s5, aiming at the harmonic source analysis result in the step S3, specially marking the overproof harmonic source on a geographical map, and marking a common filtering method and specific filtering parameters on the geographical map near the harmonic source; the filtering parameter is calculated by adopting the following steps:
1) Calculating the calculation parameters of the n-time single-tuned filter, comprising:
(1) determining the measured values of the bus voltage and the n-th harmonic current value;
(2) the minimum capacitance C is calculated as follows (n)min
In the formula of omega 1 Is the fundamental angular frequency; u shape 1 Is the bus voltage, I n Is the measured value of the current value of n harmonics, and n is the harmonic frequency;
(3) the inductor parameter L is calculated as follows:
in the formula, epsilon is the partial resonance rate and is generally 0.015;
(4) calculating a resistor parameter R as follows;
in the formula Q f The quality factor is generally 15-80;
2) Calculating the main parameters of the high-pass filter, including:
(1) the cut-off frequency of the high-pass filter is selected to be n +2 times;
(2) the capacitance C of the high-pass filter is calculated as follows (min) ；
In the formula I i Is the i-th harmonic current value, C * (min) Is the per unit value of the capacitance;
(3) calculating the resistance value R of the high-pass filter according to the following formula;
(4) calculating the inductance value L1 of the high-pass filter according to the following formula;
L1＝mR 2 C (min)
wherein m is a parameter related to the quality factor, and the corresponding value is between 0.5 and 2.
2. The method of monitoring harmonic sources of a power grid according to claim 1, wherein the typical harmonic sources of step S2 include wind farms, grid-tied photovoltaic power generation, electric locomotives, mill loads, and electric arc furnaces.
3. Method for monitoring harmonic sources of an electric network according to claim 1 or 2, characterized in that the filtering method used in step S5 is a method using a combination of n-times single-tuned filter and high-pass filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511026851.4A CN105429304B (en) | 2015-12-31 | 2015-12-31 | The method being monitored to the harmonic source of power grid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511026851.4A CN105429304B (en) | 2015-12-31 | 2015-12-31 | The method being monitored to the harmonic source of power grid |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105429304A CN105429304A (en) | 2016-03-23 |
| CN105429304B true CN105429304B (en) | 2018-05-25 |
Family
ID=55507311
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201511026851.4A Active CN105429304B (en) | 2015-12-31 | 2015-12-31 | The method being monitored to the harmonic source of power grid |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105429304B (en) |
Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107525969A (en) * | 2016-06-21 | 2017-12-29 | 中电普瑞科技有限公司 | A kind of self-adapting type electric harmonic analysis method for merging many algorithms |
| CN106771584A (en) * | 2016-11-16 | 2017-05-31 | 合肥普望电子有限责任公司 | A kind of harmonic detecting method for being applied to power distribution network |
| CN106712022B (en) * | 2017-01-11 | 2019-09-17 | 国网山西省电力公司电力科学研究院 | A kind of more limit value appraisal procedures of harmonic pollution degree for considering to administer effect |
| CN107478911B (en) * | 2017-09-05 | 2020-08-11 | 国网河南省电力公司检修公司 | Method and system for measuring capacitance value of high-voltage capacitor based on harmonic waves |
| CN107703407A (en) * | 2017-09-28 | 2018-02-16 | 中矿龙科能源科技(北京)股份有限公司 | power cable diagnostic method and device |
| CN108134815B (en) * | 2017-11-27 | 2021-03-16 | 国网北京市电力公司 | Control method and device for electromagnetic field map display and server |
| CN108879759B (en) * | 2018-06-20 | 2020-05-05 | 国网内蒙古东部电力有限公司电力科学研究院 | Harmonic analysis and treatment method for grid connection of double-fed wind generating set |
| CN110927425B (en) * | 2018-09-20 | 2021-09-07 | 中国石油化工股份有限公司 | Harmonic source section positioning method of power distribution network based on harmonic current monitoring |
| CN110927426B (en) * | 2018-09-20 | 2021-09-07 | 中国石油化工股份有限公司 | Harmonic source section positioning method for power distribution network |
| CN109541308B (en) * | 2019-01-25 | 2020-12-04 | 中国科学院电工研究所 | Harmonic wave analysis method based on distributed quasi-synchronous power grid measurement system |
| CN109861228B (en) * | 2019-02-26 | 2020-10-09 | 国家电网有限公司 | Harmonic wave monitoring method |
| CN110887993A (en) * | 2019-11-14 | 2020-03-17 | 新奥数能科技有限公司 | Power harmonic detection and treatment analysis method and device |
| CN111141503A (en) * | 2019-12-20 | 2020-05-12 | 国网浙江海盐县供电有限公司 | Portable GIS isolating switch operating mechanism mechanical characteristic tester and testing method |
| CN112114196B (en) * | 2020-09-23 | 2023-01-06 | 广东电网有限责任公司中山供电局 | Current harmonic wave statistics and warning method and system |
| CN114172187A (en) * | 2021-12-24 | 2022-03-11 | 广东电网有限责任公司 | Monitoring method and device for high-voltage direct-current transmission system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1046982A (en) * | 1989-05-30 | 1990-11-14 | 山东省煤炭科学研究所 | Power system harmonizing wave measuring method and measuring instrument |
| JP5618294B2 (en) * | 2010-10-13 | 2014-11-05 | 独立行政法人産業技術総合研究所 | High and low voltage distribution system voltage regulation system |
| CN105137231A (en) * | 2015-08-25 | 2015-12-09 | 李忠 | Power quality monitoring method and system |
-
2015
- 2015-12-31 CN CN201511026851.4A patent/CN105429304B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1046982A (en) * | 1989-05-30 | 1990-11-14 | 山东省煤炭科学研究所 | Power system harmonizing wave measuring method and measuring instrument |
| JP5618294B2 (en) * | 2010-10-13 | 2014-11-05 | 独立行政法人産業技術総合研究所 | High and low voltage distribution system voltage regulation system |
| CN105137231A (en) * | 2015-08-25 | 2015-12-09 | 李忠 | Power quality monitoring method and system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105429304A (en) | 2016-03-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105429304B (en) | The method being monitored to the harmonic source of power grid | |
| Iyer et al. | A twofold Daubechies-wavelet-based module for fault detection and voltage regulation in SEIGs for distributed wind power generation | |
| Rahman et al. | Flicker estimation associated with pv integrated distribution network | |
| CN212208349U (en) | Online risk assessment device of distribution transformer based on multisource information | |
| CN103489035A (en) | Power grid electric energy quality comprehensive evaluation method based on gray weighting correlation analysis algorithm | |
| CN103605016B (en) | A kind of power quality data treating method and apparatus | |
| CN107798395A (en) | A kind of power grid accident signal automatic diagnosis method and system | |
| CN102931728B (en) | Online identification and visualization method for power grid disturbances based on multi-resolution wavelet analysis | |
| CN103149492B (en) | Micro-grid short circuit fault diagnose method based on intelligent electric meter | |
| CN103837777A (en) | Method and system for power quality assessment of power supply system | |
| CN103729804A (en) | On-line decision support method for responding to power quality early warning | |
| CN104362628A (en) | Control method and device for avoiding large-wind-field resonance | |
| CN102467556B (en) | Power quality intelligent information system and method | |
| CN104330615A (en) | Multi-phase measuring device of lightning arrester and transformer based on FFT algorithm and method thereof | |
| CN102798758B (en) | Method and system for measuring series reactance rate of shunt capacitor bank | |
| Damala et al. | A simple decision tree-based disturbance monitoring system for VSC-based HVDC transmission link integrating a DFIG wind farm | |
| CN105550450B (en) | Electric energy quality interference source characteristic harmonic modeling method | |
| Li et al. | Research on new characteristics of power quality in distribution network | |
| Streubel et al. | Detection and monitoring of supraharmonic anomalies of an electric vehicle charging station | |
| Gong et al. | A severity assessment method for multiple voltage sag | |
| CN116341701A (en) | Prediction method and system for low-voltage distributed photovoltaic power generation system | |
| Moloi et al. | Power Quality Assessment of A Wind Power-Integrated System into the Power Grid | |
| CN112964948B (en) | Series reactor running state online monitoring method and system based on wave recording data inversion | |
| CN115940416A (en) | Distributed power quality diagnosis method and system | |
| CN111969660B (en) | Primary frequency modulation assessment method and system based on different working condition reward and punishment double-track operation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |