CN108964029B - Online safe operation early warning method for parallel capacitor based on life cycle management - Google Patents
Online safe operation early warning method for parallel capacitor based on life cycle management Download PDFInfo
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- CN108964029B CN108964029B CN201810732777.5A CN201810732777A CN108964029B CN 108964029 B CN108964029 B CN 108964029B CN 201810732777 A CN201810732777 A CN 201810732777A CN 108964029 B CN108964029 B CN 108964029B
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- 239000003990 capacitor Substances 0.000 title claims abstract description 149
- 238000000034 method Methods 0.000 title claims abstract description 25
- 230000001052 transient effect Effects 0.000 claims abstract description 13
- 238000012544 monitoring process Methods 0.000 claims abstract description 4
- 230000000630 rising effect Effects 0.000 claims description 3
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims 1
- 229910052708 sodium Inorganic materials 0.000 claims 1
- 239000011734 sodium Substances 0.000 claims 1
- 238000012423 maintenance Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007418 data mining Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000013178 mathematical model Methods 0.000 description 1
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/001—Measuring interference from external sources to, or emission from, the device under test, e.g. EMC, EMI, EMP or ESD testing
-
- 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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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- Electromagnetism (AREA)
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Measurement Of Resistance Or Impedance (AREA)
- Testing Electric Properties And Detecting Electric Faults (AREA)
Abstract
The invention discloses a parallel capacitor online safe operation early warning method based on life cycle management, which comprises the following steps: 1) the method comprises the steps of monitoring the electromagnetic environment of the power quality of a capacitor on line to obtain the steady-state power quality and the transient-state power quality; 2) constructing a capacitor voltage transient rise early warning model, a capacitor voltage peak value model and a capacitor capacity model according to the steady-state power quality and the transient-state power quality obtained in the step 1); 3) and respectively carrying out online safe operation early warning on the parallel capacitors according to the capacitor voltage transient rise early warning model, the capacitor voltage peak value model and the capacitor capacity model, wherein the method can carry out online safe operation early warning on the parallel capacitors.
Description
Technical Field
The invention relates to an online safe operation early warning method for a parallel capacitor, and relates to an online safe operation early warning method for a parallel capacitor based on life cycle management.
Background
The power supply and power utilization system is a complex electromagnetic environment, all electrical equipment operates in the power quality environment, if the power quality environment exceeds the bearing capacity of the electrical equipment, damage can be caused to the electrical equipment, and when the damage is accumulated to a certain degree, the electrical equipment can be damaged. In turn, the operation of electrical equipment at potential risk can also affect the development of changes in its power quality environment. Therefore, based on the constraint of the electric energy quality environment borne by the electrical equipment in the design stage, the whole-course early warning is carried out on the operation of the electrical equipment from the perspective of asset life cycle management, and the method is a necessary means for ensuring the safe and reliable operation of the electrical equipment.
The management is based on the asset life cycle, namely starting from the electrical constraint of the capacitor design stage, establishing a mathematical model by combining the series reactance of the capacitor and the power grid background parameter from the capacitor installation and operation, realizing the early warning of potential accident potential, providing a basis for the accurate operation, maintenance and state maintenance of the parallel capacitors, finding and eliminating the safety potential early, avoiding the occurrence of accidents, reducing the operation and maintenance cost, effectively prolonging the service life, and realizing the comprehensive optimal target of the asset management safety, efficiency and cost of the parallel capacitors.
The method has the advantages that the fault type, the fault strength and the fault evolution trend are judged by detecting the partial discharge ultrasonic signals excited by the capacitor fault, and the automatic early warning of the capacitor fault is realized.
The electric capacity of each phase is calculated through electric energy quality detection data, the development of the electric capacity is predicted by adopting a data mining method, and the method is based on the specification of standard DL/T840-: the early warning is carried out on the requirement that the integrated difference between the actually measured total capacitance of the capacitor bank and the rated capacitance of each capacitor is not more than 5 percent, however, the method still does not consider the influence of various electromagnetic disturbances on the operation of the capacitor, so the early warning on the safe operation of the capacitor cannot be accurately realized.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a parallel capacitor online safe operation early warning method based on life cycle management, and the method can perform online early warning on the safe operation of the parallel capacitor.
In order to achieve the aim, the online safe operation early warning method of the parallel capacitor based on the full life cycle management comprises the following steps:
1) the method comprises the steps of monitoring the electromagnetic environment of the power quality of a capacitor on line to obtain the steady-state power quality and the transient-state power quality;
2) constructing a capacitor voltage transient rise early warning model, a capacitor voltage peak value model and a capacitor capacity model according to the steady-state power quality and the transient-state power quality obtained in the step 1);
3) and respectively carrying out online safe operation early warning on the parallel capacitors according to the capacitor voltage temporary rise early warning model, the capacitor voltage peak value model and the capacitor capacity model.
The specific operation of the online safe operation early warning of the parallel capacitor according to the capacitor voltage transient rise early warning model is as follows:
when the temporary rising frequency of the capacitor is higher than 1.15 times of the rated voltage for more than 200 times in the life cycle, an alarm is given.
The capacitor voltage peak model is:
wherein, VpeakIs the peak voltage of the capacitor, Vc1Is the fundamental voltage of a capacitor, VcnIs the nth harmonic voltage of a capacitor, E1Is the open-circuit fundamental voltage of the power supply of the capacitor, EnFor n times of power supply background harmonic voltage content, Y1Fundamental admittance, Y, for combined action of compensation capacitor and power supply open circuit impedance in electric power systemnThe harmonic admittance of the order of n under the combined action of a compensation capacitor and a power supply open circuit impedance in a power system, omega is the actually measured angular frequency of a power grid, and C is the capacitance value of a capacitor.
The specific operation of online safe operation early warning of the parallel capacitor according to the capacitor voltage peak value model is as follows: and acquiring the voltage peak value of the capacitor in real time through the capacitor voltage peak value model, and giving an alarm when the voltage peak value of the capacitor is larger than a preset threshold value.
The capacitor capacity model is:
where S is the present output of the capacitor, E1For power supply open-circuit fundamental voltage, EnFor n times of power supply background harmonic voltage content, Y1Fundamental admittance, Y, for combined action of compensation capacitor and power supply open circuit impedance in electric power systemnThe harmonic admittance of the order of n under the combined action of a compensation capacitor and a power supply open circuit impedance in a power system, omega is the actually measured angular frequency of a power grid, and C is the capacitance value of a capacitor.
The specific operation of online safe operation early warning of the parallel capacitor according to the capacitor capacity model is as follows: and acquiring the current output of the capacitor in real time through the capacitor capacity model, and alarming when the current output of the capacitor is greater than a preset threshold value.
The steady state power quality comprises fundamental wave voltage current and harmonic wave voltage current, and the transient state power quality comprises voltage transient rise data.
The invention has the following beneficial effects:
the invention relates to a parallel capacitor online safe operation early warning method based on life cycle management, which comprehensively considers the environment of a capacitor during specific operation, obtains the steady-state power quality and the transient-state power quality of the capacitor by online monitoring the power quality electromagnetic environment of the capacitor, then constructs a capacitor voltage transient rise early warning model, a capacitor voltage peak value model and a capacitor capacity model, and finally carries out online safe operation early warning on the parallel capacitor according to the constructed capacitor voltage transient rise early warning model, the capacitor voltage peak value model and the capacitor capacity model.
Drawings
FIG. 1 is a schematic structural diagram of a substation in a first embodiment;
fig. 2 is a diagram of a capacity warning result according to the first embodiment.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
the invention relates to a parallel capacitor online safe operation early warning method based on life cycle management, which comprises the following steps:
1) the method comprises the steps that an electromagnetic environment of the power quality where a capacitor is located is monitored on line, and steady-state power quality and transient-state power quality are obtained, wherein the steady-state power quality comprises fundamental voltage current and harmonic voltage current, and the transient-state power quality comprises voltage transient-state real-time data;
2) constructing a capacitor voltage transient rise early warning model, a capacitor voltage peak value model and a capacitor capacity model according to the steady-state power quality and the transient-state power quality obtained in the step 1);
3) and respectively carrying out online safe operation early warning on the parallel capacitors according to the capacitor voltage temporary rise early warning model, the capacitor voltage peak value model and the capacitor capacity model.
The specific operation of the online safe operation early warning of the parallel capacitor according to the capacitor voltage transient rise early warning model is as follows:
when the temporary rising frequency of the capacitor is higher than 1.15 times of the rated voltage for more than 200 times in the life cycle, an alarm is given.
The capacitor voltage peak model is:
wherein, VpeakIs the peak voltage of the capacitor, Vc1Is the fundamental voltage of a capacitor, VcnIs the nth harmonic voltage of a capacitor, E1Power supply switch base for capacitorWave voltage, EnFor n times of power supply background harmonic voltage content, Y1Fundamental admittance, Y, for combined action of compensation capacitor and power supply open circuit impedance in electric power systemnThe harmonic admittance of the order of n under the combined action of a compensation capacitor and a power supply open circuit impedance in a power system, omega is the actually measured angular frequency of a power grid, and C is the capacitance value of a capacitor.
The specific operation of online safe operation early warning of the parallel capacitor according to the capacitor voltage peak value model is as follows: and acquiring the voltage peak value of the capacitor in real time through the capacitor voltage peak value model, and giving an alarm when the voltage peak value of the capacitor is larger than a preset threshold value.
The capacitor capacity model is:
wherein S is the capacity of the capacitor, E1For power supply open-circuit fundamental voltage, EnFor n times of power supply background harmonic voltage content, Y1Fundamental admittance, Y, for combined action of compensation capacitor and power supply open circuit impedance in electric power systemnThe harmonic admittance of the order of n under the combined action of a compensation capacitor and a power supply open circuit impedance in a power system, omega is the actually measured angular frequency of a power grid, and C is the capacitance value of a capacitor.
The specific operation of online safe operation early warning of the parallel capacitor according to the capacitor capacity model is as follows: and acquiring the current output of the capacitor in real time through the capacitor capacity model, and alarming when the current output of the capacitor is greater than a preset threshold value.
Example one
The invention can be applied to the compensation real-time early warning of the parallel capacitor of the transformer substation.
As shown in fig. 1, the 35kV substation has a total main transformer 2, the #1 main transformer has a capacity of 3.15MVA, the main transformer type is SZ9-3150/35, the rated voltage (high/low) is 35 ± 3 × 2.5%/10.5, and the on-load tap changer; #2 main transformer with capacity of 3.15MVA, SZ9-3150/35, rated voltage (high/low) of 35 + -3 × 2.5%/10.5, on-load tap changing transformer. The 35kV incoming line of the transformer substation is 2 times, and 10kV adopts single bus wiring; the 10kV system runs in parallel, and 1 group of parallel capacitor devices with the model number of TBB10-1000AKW are installed. The early warning equipment installation point is a 10kV bus side 194 capacitor switch, and background parameters are shown in table 1.
TABLE 1
Fig. 2 shows the capacity warning result, and it can be seen that 5 th harmonic threatens the operation of the capacitor and needs to be taken.
Claims (4)
1. A parallel capacitor online safe operation early warning method based on life cycle management is characterized by comprising the following steps:
1) the method comprises the steps of monitoring the electromagnetic environment of the power quality of a capacitor on line to obtain the steady-state power quality and the transient-state power quality;
2) constructing a capacitor voltage transient rise early warning model, a capacitor voltage peak value model and a capacitor capacity model according to the steady-state power quality and the transient-state power quality obtained in the step 1);
3) respectively carrying out online safe operation early warning on the parallel capacitors according to the capacitor voltage temporary rise early warning model, the capacitor voltage peak value model and the capacitor capacity model;
the capacitor voltage peak model is:
wherein, VpeakIs the peak voltage of the capacitor, Vc1Is the fundamental voltage of a capacitor, VcnIs the nth harmonic voltage of a capacitor, E1Is the open-circuit fundamental voltage of the power supply of the capacitor, EnFor n times of power supply background harmonic voltage content, Y1Fundamental admittance, Y, for combined action of compensation capacitor and power supply open circuit impedance in electric power systemnFor n-th harmonic of combined action of compensation capacitor and power supply open-circuit impedance in power systemThe method comprises the following steps that wave guide sodium, omega is the actually measured angular frequency of a power grid, and C is the capacitance value of a capacitor;
the specific operation of online safe operation early warning of the parallel capacitor according to the capacitor voltage peak value model is as follows: acquiring a voltage peak value of the capacitor in real time through a capacitor voltage peak value model, and alarming when the voltage peak value of the capacitor is larger than a preset threshold value;
the capacitor capacity model is:
where S is the present output of the capacitor, E1For power supply open-circuit fundamental voltage, EnFor n times of power supply background harmonic voltage content, Y1Fundamental admittance, Y, for combined action of compensation capacitor and power supply open circuit impedance in electric power systemnThe harmonic admittance of the order of n under the combined action of a compensation capacitor and a power supply open circuit impedance in a power system, omega is the actually measured angular frequency of a power grid, and C is the capacitance value of a capacitor.
2. The parallel capacitor online safe operation early warning method based on full life cycle management as claimed in claim 1, wherein the specific operation of the early warning of the online safe operation of the parallel capacitor according to the capacitor voltage transient rise early warning model is as follows:
when the temporary rising frequency of the capacitor is higher than 1.15 times of the rated voltage for more than 200 times in the life cycle, an alarm is given.
3. The parallel capacitor online safe operation early warning method based on full life cycle management as claimed in claim 1, wherein the operation of the early warning of the online safe operation of the parallel capacitor according to the capacitor capacity model is as follows: and acquiring the current output of the capacitor in real time through the capacitor capacity model, and alarming when the current output of the capacitor is greater than a preset threshold value.
4. The parallel capacitor online safe operation early warning method based on full life cycle management of claim 1, wherein the steady state power quality comprises fundamental voltage current and harmonic voltage current, and the transient state power quality comprises voltage sag.
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| CN103983865A (en) * | 2014-03-25 | 2014-08-13 | 南京能迪电气技术有限公司 | Series reactor power capacitor group operating state real-time online monitoring method |
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