CN105429304A - Power grid harmonic wave monitoring method - Google Patents

Power grid harmonic wave monitoring method Download PDF

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Publication number
CN105429304A
CN105429304A CN201511026851.4A CN201511026851A CN105429304A CN 105429304 A CN105429304 A CN 105429304A CN 201511026851 A CN201511026851 A CN 201511026851A CN 105429304 A CN105429304 A CN 105429304A
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harmonic
source
harmonic source
current
voltage
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CN105429304B (en
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陈耀红
陈仲伟
陈剑
刘毅
程梦凌
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State Grid Corp of China SGCC
State Grid Hunan Electric Power Co Ltd
Economic and Technological Research Institute of State Grid Hunan Electric Power Co Ltd
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State Grid Corp of China SGCC
State Grid Hunan Electric Power Co Ltd
Economic and Technological Research Institute of State Grid Hunan Electric Power Co Ltd
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    • 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

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  • Engineering & Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention discloses a power grid harmonic wave monitoring method. The power grid harmonic wave monitoring method includes the following steps that: harmonic wave data of all typical harmonic waves of a power grid system are acquired; positions where the typical harmonic wave sources are connected into the power system are displayed on a geographic map, and the voltage and current of the harmonic wave sources are monitored; harmonic wave source analysis is performed on the voltage and current of the harmonic wave sources; the harmonic wave sources are graded, colored and displayed in real time according harmonic wave states based on national standards; and harmonic wave sources exceeding the standards are specially labeled, and commonly-used filtering methods and specific filtering parameters are labeled. According to the power grid harmonic wave monitoring method of the invention, the parameters of the typical harmonic wave sources of the power grid system are acquired, are analyzed and calculated; hierarchical display and early warning are performed on the harmonic wave sources based on the standards; the harmonic wave sources exceeding the standards can be correspondingly warned against; corresponding filtering methods and the parameters of filters are provided. With the power grid harmonic wave monitoring method of the invention adopted, the states of the harmonic waves of a power grid can be monitored, analyzed, displayed and warned against clearly and comprehensively, and filtering guide can be provided for the harmonic wave sources. The method is simple, efficient and reliable.

Description

To the method that the harmonic source of electrical network is monitored
Technical field
The invention belongs to power system automatic field, be specifically related to a kind of method that the harmonic source of electrical network is monitored.
Background technology
Along with the development of national economy technology and the raising day by day of living standards of the people, the power consumption of electric power system also progressively increases.Current China electricity generation system is still based on burning coal as the thermal power generation of energy source.
Along with the continuous consumption of fossil energy, and the environmental protection consciousness that the people strengthen day by day, in whole energy-consuming, play more and more important role with the new cleaning fuel that wind energy, solar energy are representative.Due to wind energy, solar energy, time variation, inevitably produce a large amount of harmonic wave in above-mentioned clean energy resource power generation process, along with the continuous increase of clean energy resource installed capacity, its harmonic problem caused electric power system is very important.There is a large amount of nonlinear-load in electric power system, such as traction locomotive, arc furnace, rolling mill etc., these nonlinear-loads inject a large amount of harmonic wave equally in electric power system simultaneously.On the other hand, harmonic wave can cause the power quality problems such as such as voltage fluctuation and flicker equally.
At present, although electrical network exists numerous harmonic source, operations staff only can carry out Real-Time Monitoring for single mains by harmonics source; Meanwhile, the alarm if mains by harmonics transfinites, operations staff cannot judge the main source of mains by harmonics fast, therefore cannot carry out emergency treatment for harmonic source rapidly; To the harmonic source that initiation mains by harmonics exceeds standard, if do not position fast and process, then the mains by harmonics exceeded standard may cause the further fault of electrical network, thus affects the reliability of mains supply.
Summary of the invention
The object of the present invention is to provide a kind of can clear, comprehensive monitoring show the harmonic wave state in mains by harmonics source, and accurately can to locate harmonic source and the method that the harmonic source of electrical network is monitored that filtering is instructed.
This method of monitoring the harmonic source of electrical network provided by the invention, comprises the steps:
S1. the harmonic data of all typical harmonic sources in grid monitoring system is obtained;
S2. the position of each typical harmonic source access electric power system is shown on geographical map based on GIS-Geographic Information System, and the voltage and current of each harmonic source of Real-Time Monitoring;
S3. harmonic source analysis is carried out to the voltage and current of each harmonic source that step S2 obtains;
S4. for the harmonic source analysis result of step S3, according to the electric pressure of national harmonic standard and harmonic source, harmonic source is carried out classification and painted according to harmonic wave state, and shows in real time on geographical map;
S5. for the harmonic source analysis result of step S3, the harmonic source exceeded standard is marked especially on geographical map, and the geographical map near harmonic source is marked for conventional filtering method and concrete filtering parameter.
Typical harmonic source described in step S2, comprises wind energy turbine set, parallel network power generation, electric locomotive, mill load and arc furnace.
Harmonic source described in step S4 carries out classification and painted according to harmonic wave state, comprises and carries out classification and painted respectively to the harmonic voltage of harmonic source and harmonic current.
The described harmonic voltage to harmonic source carries out classification and painted, comprises the steps:
1) if the voltage total harmonic distortion factor of harmonic source is less than 50% of standard regulation maximum, then the harmonic voltage grade of this harmonic source is excellent;
2) if the voltage total harmonic distortion factor of harmonic source is between 50% and 75% of standard regulation maximum, then the harmonic voltage grade of this harmonic source is good;
3) if the voltage total harmonic distortion factor of harmonic source is between 75% and 100% of standard regulation maximum, then the harmonic voltage grade of this harmonic source is qualified;
4) if the voltage total harmonic distortion factor of harmonic source is between 100% and 150% of standard regulation maximum, then the harmonic voltage grade of this harmonic source is for exceeding standard.
5) if the voltage total harmonic distortion factor of harmonic source is between 150% and 200% of standard regulation maximum, then the harmonic voltage grade of this harmonic source is serious.
6) if the voltage total harmonic distortion factor of harmonic source is greater than 200% of standard regulation maximum, then the harmonic voltage grade of this harmonic source is extremely serious.
The described harmonic current to harmonic source carries out classification and painted, comprises the steps:
1) the individual harmonic current value of measurement is all converted under benchmark capacity of short circuit;
2) if the individual harmonic current value of harmonic source is all less than 50% of standard permissible value, then the harmonic current grade of this harmonic source is excellent;
3) if the individual harmonic current value of harmonic source is all less than 75% of standard permissible value, but have that certain subharmonic current is greater than permissible value 50%, then the harmonic current grade of this harmonic source is good;
4) if the individual harmonic current value of harmonic source is all less than 100% of standard permissible value, but have that certain subharmonic current is greater than permissible value 75%, then the harmonic current grade of this harmonic source is qualified;
5) if the individual harmonic current value of harmonic source is all less than 150% of standard permissible value, but have that certain subharmonic current is greater than permissible value 100%, then the harmonic current grade of this harmonic source is for exceeding standard;
6) if the individual harmonic current value of harmonic source is all less than 200% of standard permissible value, but have that certain subharmonic current is greater than permissible value 150%, then the harmonic current grade of this harmonic source is serious;
7) if harmonic source have that certain subharmonic current is greater than standard permissible value 200%, then the harmonic current grade of this harmonic source is extremely serious.
Conventional filtering method described in step S5, filtering method is the method adopting n single tuned filter and high pass filter combination.
The filtering parameter of the filtering method described in step S5, specifically comprises the steps:
1) calculate the calculating parameter of n single tuned filter, comprising:
1. busbar voltage and nth harmonic current value measured value is determined;
2. position of minimum capacitance C is calculated according to the following formula (n) min
C ( n ) m i n = I n × ( 1 + 10 % ) U 1 ω 1 n 2 - 1 n n 2
ω in formula 1for first-harmonic angular frequency; U 1for busbar voltage, I nfor nth harmonic current value measured value, n is harmonic number;
3. inductor parameter L is calculated according to the following formula:
L = 1 n 2 ω 1 2 C ( n ) m i n ( 1 + ϵ )
In formula, ε is partial resonance rate, and general value is 0.015;
4. resistor parameter R is calculated according to the following formula;
R = 1 Q f 1 nω 1 C ( n ) m i n
Q in formula ffor quality factor, general value is 15 ~ 80;
2) calculate the major parameter of high pass filter, comprising:
1. the cut-off frequency of high pass filter is chosen as n+2 time;
2. the capacitance C of high pass filter is calculated according to the following formula (min);
C ( m i n ) * ≅ Σ i = n + 2 ∞ I i i
C (min)＝C * (min)C (n)min
I in formula ifor i subharmonic current value, C * (min)for electric capacity perunit value;
3. the resistance value R of high pass filter is calculated according to the following formula;
R = 1 ( n + 2 ) ω 1 C ( m i n )
4. the inductance value L of high pass filter is calculated according to the following formula;
L＝mR 2C (min)
In formula, m is the parameter relevant to quality factor, and corresponding value is between 0.5 ~ 2.
The inventive method gathers the electric current and voltage numerical value of the typical harmonic source in electrical network, analysis and calculation is carried out to the voltage of harmonic source, current values, and carry out classification display, early warning and location according to the accurate harmonic voltage to harmonic source of state's network mark and harmonic current, and provide corresponding warning for the harmonic source exceeded standard, provide the parameter designing of corresponding filtering method and filter simultaneously.The inventive method can clear, comprehensively mains by harmonics source state is monitored, analyzes, shows, locates and is reported to the police, and can carry out certain filtering to harmonic source and instruct, method is simple, efficient and reliable.
Accompanying drawing explanation
Fig. 1 is method flow diagram of the present invention.
Fig. 2 is single tuned filter circuit theory diagrams of the present invention.
Fig. 3 is circuit of high pass filter schematic diagram of the present invention.
Fig. 4 is the harmonic voltage situation schematic diagram of specific embodiments of the invention.
Fig. 5 is the harmonic current situation schematic diagram of specific embodiments of the invention.
Embodiment
As shown in Figure 1, be method flow diagram of the present invention: this method of monitoring the harmonic source of electrical network provided by the invention, comprises the steps:
S1. the harmonic data of all typical harmonic sources in grid monitoring system is obtained;
S2. the position of each typical harmonic source access electric power system is shown on geographical map based on GIS-Geographic Information System, and the voltage and current of each harmonic source of Real-Time Monitoring;
Described typical harmonic source, comprises wind energy turbine set, parallel network power generation, electric locomotive, mill load and arc furnace
S3. harmonic source analysis is carried out to the voltage and current of each harmonic source that step S2 obtains;
S4. for the harmonic source analysis result of step S3, according to the electric pressure of national harmonic standard and harmonic source, harmonic source is carried out classification and painted according to harmonic wave state, and shows in real time on geographical map;
Described harmonic source carries out classification and painted according to harmonic wave state, comprises and carries out classification and painted respectively to the harmonic voltage of harmonic source and harmonic current.
Classification and painted is carried out to the harmonic voltage of harmonic source, comprising:
1) if the voltage total harmonic distortion factor of harmonic source is less than 50% of standard regulation maximum, then the harmonic voltage grade of this harmonic source is excellent;
2) if the voltage total harmonic distortion factor of harmonic source is between 50% and 75% of standard regulation maximum, then the harmonic voltage grade of this harmonic source is good;
3) if the voltage total harmonic distortion factor of harmonic source is between 75% and 100% of standard regulation maximum, then the harmonic voltage grade of this harmonic source is qualified;
4) if the voltage total harmonic distortion factor of harmonic source is between 100% and 150% of standard regulation maximum, then the harmonic voltage grade of this harmonic source is for exceeding standard.
5) if the voltage total harmonic distortion factor of harmonic source is between 150% and 200% of standard regulation maximum, then the harmonic voltage grade of this harmonic source is serious.
6) if the voltage total harmonic distortion factor of harmonic source is greater than 200% of standard regulation maximum, then the harmonic voltage grade of this harmonic source is extremely serious.
Classification and painted is carried out to the harmonic current of harmonic source, comprising:
1) the individual harmonic current value of measurement is all converted under benchmark capacity of short circuit;
2) if the individual harmonic current value of harmonic source is all less than 50% of standard permissible value, then the harmonic current grade of this harmonic source is excellent;
3) if the individual harmonic current value of harmonic source is all less than 75% of standard permissible value, but have that certain subharmonic current is greater than permissible value 50%, then the harmonic current grade of this harmonic source is good;
4) if the individual harmonic current value of harmonic source is all less than 100% of standard permissible value, but have that certain subharmonic current is greater than permissible value 75%, then the harmonic current grade of this harmonic source is qualified;
5) if the individual harmonic current value of harmonic source is all less than 150% of standard permissible value, but have that certain subharmonic current is greater than permissible value 100%, then the harmonic current grade of this harmonic source is for exceeding standard;
6) if the individual harmonic current value of harmonic source is all less than 200% of standard permissible value, but have that certain subharmonic current is greater than permissible value 150%, then the harmonic current grade of this harmonic source is serious;
7) if harmonic source have that certain subharmonic current is greater than standard permissible value 200%, then the harmonic current grade of this harmonic source is extremely serious.
S5. for the harmonic source analysis result of step S3, the harmonic source exceeded standard is marked especially on geographical map, and by conventional filtering method, as adopted the method for n single tuned filter and high pass filter combination, and the geographical map of concrete filtering parameter near harmonic source marks.
As shown in Figure 2, the circuit theory diagrams of high pass filter are as shown in Figure 3 for the circuit theory diagrams of single tuned filter.
When adopting the filtering method of n single tuned filter and high pass filter combination, the computational process of the parameter of filter is as follows:
1) calculate the calculating parameter of n single tuned filter, comprising:
1. busbar voltage and nth harmonic current value measured value is determined;
2. position of minimum capacitance C is calculated according to the following formula (n) min
C ( n ) m i n = I n × ( 1 + 10 % ) U 1 ω 1 n 2 - 1 n n 2
ω in formula 1for first-harmonic angular frequency; U 1for busbar voltage, I nfor nth harmonic current value measured value, n is harmonic number;
3. inductor parameter L is calculated according to the following formula:
L = 1 n 2 ω 1 2 C ( n ) m i n ( 1 + ϵ )
In formula, ε is partial resonance rate, and general value is 0.015;
4. resistor parameter R is calculated according to the following formula;
R = 1 Q f 1 nω 1 C ( n ) m i n
Q in formula ffor quality factor, general value is 15 ~ 80;
2) calculate the major parameter of high pass filter, comprising:
1. the cut-off frequency of high pass filter is chosen as n+2 time;
2. the capacitance C of high pass filter is calculated according to the following formula (min);
C ( m i n ) * ≅ Σ i = n + 2 ∞ I i i
C (min)＝C * (min)C (n)min
I in formula ifor i subharmonic current value, C * (min)for electric capacity perunit value;
3. the resistance value R of high pass filter is calculated according to the following formula;
R = 1 ( n + 2 ) ω 1 C ( m i n )
4. the inductance value L of high pass filter is calculated according to the following formula;
L＝mR 2C (min)
In formula, m is the parameter relevant to quality factor, and corresponding value is between 0.5 ~ 2.
Below in conjunction with a specific embodiment, method of the present invention is further described:
Suppose that certain region mainly comprises 5 kinds of typical harmonic sources such as wind energy turbine set, traction substation, arc furnace, rolling mill, photovoltaic plant, above-mentioned harmonic source electric pressure is 110kV, and certain moment harmonic voltage of the grid-connected measurement point test of harmonic source and current conditions are as shown in table 1, table 2.
Table 1 somewhere harmonic source harmonic voltage situation
Harmonic source type Voltage total harmonic distortion factor
Wind energy turbine set 1 1.2％
Wind energy turbine set 2 2.5％
Traction substation 5％
Arc furnace 1 1.8％
Arc furnace 2 3.5％
Rolling mill 4.3％
Photovoltaic plant 1.7％
Table 2 somewhere harmonic source harmonic current situation (being all converted to reference capacity)
Based on GIS technology, plane map displaying is carried out to this area, each typical harmonic source electric power system access point position is labeled on map.Different harmonic sources adopts different appearance graphics to be presented on map, and concrete corresponded manner is as shown in table 3.
The different harmonic source outward appearance diagram of table 3
For different electric pressures, by each harmonic source harmonic voltage and current class Real time dynamic display on map respectively.National standard limit value is adopted to divide harmonic voltage and current class.Division rule is as follows:
High-quality: <50% limit value
Good: 50% ~ 75% limit value
Close to limit value: 75% ~ 100% limit value
For 110kV electric pressure, for voltage harmonic, its voltage total harmonic distortion factor limit value is 2.0%.Be divided into 3 grades, division result is as shown in table 4.
Table 4 harmonic voltage grade classification
Voltage total harmonic distortion factor <1％ 1％～1.5％ 1.5％～2％
Harmonic voltage grade High-quality Well Close to limit value
For current harmonics, individual harmonic current permissible value is different, and for 2 subharmonic currents, when reference capacity is 750MVA, permissible value is 12A.Be divided into 3 grades, division result is as shown in table 5.
Table 5 harmonic current grade classification
2 subharmonic current values <6A 6A～9A 9A～12A
Harmonic current grade High-quality Well Close to limit value
For other subharmonic currents, adopt similar division methods.Comprehensive individual harmonic current grade, gets the poorest graded response general status.
Divide through harmonic voltage and current class, for the harmonic source do not exceeded standard, replace different harmonic levels with the gradual filling of different lime, for wind energy turbine set harmonic source, display pattern is as shown in table 6.
Table 6 wind energy turbine set harmonic levels display pattern
For the harmonic source exceeding national regulation permissible value, threshold alarm is carried out in the gradual filling with baihuixiong on map.According to exceeding situation, be divided into respectively exceed standard, seriously, extremely serious, division rule is as follows:
Exceed standard: 100% ~ 150% limit value
Serious: 150% ~ 200% limit value
Extremely serious: >200% limit value
For 110KV electric pressure, for voltage harmonic, its voltage total harmonic distortion factor limit value is 2.0%.The part exceeding limit value is divided into 3 grades, division result is as shown in table 7.
Table 7 harmonic voltage grade classification
Voltage total harmonic distortion factor 2％～3％ 3％～4％ >4％
Harmonic voltage grade Exceed standard Seriously Extremely serious
For current harmonics, individual harmonic current permissible value is different, and for 2 subharmonic currents, when reference capacity is 750MVA, permissible value is 12A.The part exceeding limit value is divided into 3 grades, division result is as shown in table 8.
Table 8 harmonic current grade classification
2 subharmonic current values 12A～18A 18A～24A >24A
Harmonic current grade Exceed standard Seriously Extremely serious
For other subharmonic currents, adopt similar division methods.Comprehensive individual harmonic current grade, gets the poorest graded response general status.
Divide through harmonic voltage and current class, for the harmonic source exceeded standard, replace different harmonic levels with the gradual filling of different baihuixiong, for wind energy turbine set harmonic source, display pattern is as shown in table 9.
Table 9 wind energy turbine set harmonic levels display pattern
For above-mentioned zone, each harmonic source harmonic levels division result is as shown in table 10.
Table 10 somewhere harmonic source harmonic wave situation
Harmonic source type Voltage total harmonic distortion factor Current harmonics resultant distortion rate
Wind energy turbine set 1 Well Close to limit value
Wind energy turbine set 2 Exceed standard Seriously
Traction substation Extremely serious Seriously
Arc furnace 1 Close to limit value Close to limit value
Arc furnace 2 Seriously Extremely serious
Rolling mill Extremely serious Extremely serious
Photovoltaic plant Close to limit value Close to limit value
According to division result, wind energy turbine set 2, traction substation, arc furnace 2 voltage harmonic current harmonics all transfinite, and need to adopt black or part filled black mode to carry out threshold alarm.For above-mentioned division result, electric current and voltage harmonic wave situation schematic diagram respectively as shown in Figure 4, Figure 5.
According to display result, wind energy turbine set 2, traction substation, arc furnace 2 voltage harmonic current harmonics all transfinite, need by conventional filter match solution integration in display pattern.Wind energy turbine set 2 recommends 5,7 single tuned filters and high pass filter combination, traction substation recommends 3,5,7 single tuned filters and high pass filter combination, 3,5,7 single tuned filter combinations recommended by arc furnace 2, and 3,5,7,11,13 single tuned filter combinations recommended by rolling mill.

Claims (7)

1., to the method that the harmonic source of electrical network is monitored, comprise the steps:
S1. the harmonic data of all typical harmonic sources in grid monitoring system is obtained;
S2. the position of each typical harmonic source access electric power system is shown on geographical map based on GIS-Geographic Information System, and the voltage and current of each harmonic source of Real-Time Monitoring;
S3. harmonic source analysis is carried out to the voltage and current of each harmonic source that step S2 obtains;
S4. for the harmonic source analysis result of step S3, according to the electric pressure of national harmonic standard and harmonic source, harmonic source is carried out classification and painted according to harmonic wave state, and shows in real time on geographical map;
S5. for the harmonic source analysis result of step S3, the harmonic source exceeded standard is marked especially on geographical map, and the geographical map near harmonic source is marked for conventional filtering method and concrete filtering parameter.
2. method of monitoring the harmonic source of electrical network according to claim 1, is characterized in that the typical harmonic source described in step S2, comprises wind energy turbine set, parallel network power generation, electric locomotive, mill load and arc furnace.
3. the method that the harmonic source of electrical network is monitored according to claim 1 and 2, it is characterized in that harmonic source described in step S4 carries out classification and painted according to harmonic wave state, comprise and classification and painted is carried out respectively to the harmonic voltage of harmonic source and harmonic current.
4. method of monitoring the harmonic source of electrical network according to claim 3, is characterized in that the described harmonic voltage to harmonic source carries out classification and painted, comprises the steps:
1) if the voltage total harmonic distortion factor of harmonic source is less than 50% of standard regulation maximum, then the harmonic voltage grade of this harmonic source is excellent;
2) if the voltage total harmonic distortion factor of harmonic source is between 50% and 75% of standard regulation maximum, then the harmonic voltage grade of this harmonic source is good;
3) if the voltage total harmonic distortion factor of harmonic source is between 75% and 100% of standard regulation maximum, then the harmonic voltage grade of this harmonic source is qualified;
4) if the voltage total harmonic distortion factor of harmonic source is between 100% and 150% of standard regulation maximum, then the harmonic voltage grade of this harmonic source is for exceeding standard.
5) if the voltage total harmonic distortion factor of harmonic source is between 150% and 200% of standard regulation maximum, then the harmonic voltage grade of this harmonic source is serious.
6) if the voltage total harmonic distortion factor of harmonic source is greater than 200% of standard regulation maximum, then the harmonic voltage grade of this harmonic source is extremely serious.
5. method of monitoring the harmonic source of electrical network according to claim 3, is characterized in that the described harmonic current to harmonic source carries out classification and painted, comprises the steps:
1) the individual harmonic current value of measurement is all converted under benchmark capacity of short circuit;
2) if the individual harmonic current value of harmonic source is all less than 50% of standard permissible value, then the harmonic current grade of this harmonic source is excellent;
3) if the individual harmonic current value of harmonic source is all less than 75% of standard permissible value, but have that certain subharmonic current is greater than permissible value 50%, then the harmonic current grade of this harmonic source is good;
4) if the individual harmonic current value of harmonic source is all less than 100% of standard permissible value, but have that certain subharmonic current is greater than permissible value 75%, then the harmonic current grade of this harmonic source is qualified;
5) if the individual harmonic current value of harmonic source is all less than 150% of standard permissible value, but have that certain subharmonic current is greater than permissible value 100%, then the harmonic current grade of this harmonic source is for exceeding standard;
6) if the individual harmonic current value of harmonic source is all less than 200% of standard permissible value, but have that certain subharmonic current is greater than permissible value 150%, then the harmonic current grade of this harmonic source is serious;
7) if harmonic source have that certain subharmonic current is greater than standard permissible value 200%, then the harmonic current grade of this harmonic source is extremely serious.
6. method of monitoring the harmonic source of electrical network according to claim 1 and 2, is characterized in that the conventional filtering method described in step S5, and filtering method is the method adopting n single tuned filter and high pass filter combination.
7. method of monitoring the harmonic source of electrical network according to claim 1 and 2, is characterized in that the filtering parameter of the filtering method described in step S5, calculates for adopting following steps:
1) calculate the calculating parameter of n single tuned filter, comprising:
1. busbar voltage and nth harmonic current value measured value is determined;
2. position of minimum capacitance C is calculated according to the following formula (n) min
C ( n ) m i n = I n &times; ( 1 + 10 % ) U 1 &omega; 1 n 2 - 1 n n 2
ω in formula 1for first-harmonic angular frequency; U 1for busbar voltage, I nfor nth harmonic current value measured value, n is harmonic number;
3. inductor parameter L is calculated according to the following formula:
L = 1 n 2 &omega; 1 2 C ( n ) min ( 1 + &epsiv; )
In formula, ε is partial resonance rate, and general value is 0.015;
4. resistor parameter R is calculated according to the following formula;
R = 1 Q f 1 n&omega; 1 C ( n ) m i n
Q in formula ffor quality factor, general value is 15 ~ 80;
2) calculate the major parameter of high pass filter, comprising:
1. the cut-off frequency of high pass filter is chosen as n+2 time;
2. the capacitance C of high pass filter is calculated according to the following formula (min);
C ( m i n ) * &cong; &Sigma; i = n + 2 &infin; I i i
C (min)＝C * (min)C (n)min
I in formula ifor i subharmonic current value, C * (min)for electric capacity perunit value;
3. the resistance value R of high pass filter is calculated according to the following formula;
R = 1 ( n + 2 ) &omega; 1 C ( m i n )
4. the inductance value L of high pass filter is calculated according to the following formula;
L＝mR 2C (min)
In formula, m is the parameter relevant to quality factor, and corresponding value is between 0.5 ~ 2.
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CN106712022A (en) * 2017-01-11 2017-05-24 国网山西省电力公司电力科学研究院 Harmonic pollution level multi-limit evaluation method considering control effect
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
CN107478911A (en) * 2017-09-05 2017-12-15 国网河南省电力公司检修公司 A kind of method and system based on harmonic measure high-voltage capacitor capacitance
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
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
CN108134815A (en) * 2017-11-27 2018-06-08 国网北京市电力公司 For the control method of electromagnetic field map denotation, device and server
CN108879759A (en) * 2018-06-20 2018-11-23 国网内蒙古东部电力有限公司电力科学研究院 A kind of frequency analysis that double-fed wind power generator group is grid-connected and administering method
CN109541308A (en) * 2019-01-25 2019-03-29 中国科学院电工研究所 Harmonic analysis method based on distributed plesiochronous power grid measuring system
CN109861228A (en) * 2019-02-26 2019-06-07 国家电网有限公司 A kind of 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
CN110927425A (en) * 2018-09-20 2020-03-27 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
CN110927426A (en) * 2018-09-20 2020-03-27 中国石油化工股份有限公司 Harmonic source section positioning method for power distribution network
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
CN112114196A (en) * 2020-09-23 2020-12-22 广东电网有限责任公司中山供电局 Current harmonic statistic and alarm method and system
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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
CN106712022A (en) * 2017-01-11 2017-05-24 国网山西省电力公司电力科学研究院 Harmonic pollution level multi-limit evaluation method considering control effect
CN107478911A (en) * 2017-09-05 2017-12-15 国网河南省电力公司检修公司 A kind of method and system based on harmonic measure high-voltage capacitor capacitance
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
CN108134815A (en) * 2017-11-27 2018-06-08 国网北京市电力公司 For the control method of electromagnetic field map denotation, device and server
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
CN108879759A (en) * 2018-06-20 2018-11-23 国网内蒙古东部电力有限公司电力科学研究院 A kind of frequency analysis that double-fed wind power generator group is grid-connected and administering method
JP6991233B2 (en) 2018-06-20 2022-02-03 国网内蒙古▲東▼部▲電▼力有限公司▲電▼力科学研究院 Harmonic analysis and maintenance method for dual power supply type wind power generator set grid interconnection
JP2020528721A (en) * 2018-06-20 2020-09-24 国网内蒙古▲東▼部▲電▼力有限公司▲電▼力科学研究院 Double power supply type wind power generator set Harmonic analysis and maintenance method for grid interconnection
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
CN110927425A (en) * 2018-09-20 2020-03-27 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
CN110927426A (en) * 2018-09-20 2020-03-27 中国石油化工股份有限公司 Harmonic source section positioning method for power distribution network
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
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
CN109541308A (en) * 2019-01-25 2019-03-29 中国科学院电工研究所 Harmonic analysis method based on distributed plesiochronous power grid measuring system
CN109861228A (en) * 2019-02-26 2019-06-07 国家电网有限公司 A kind of 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
CN112114196A (en) * 2020-09-23 2020-12-22 广东电网有限责任公司中山供电局 Current harmonic statistic and alarm method and system
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

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