CN108493944A - A kind of public network based on genetic algorithm/isolated network cooperation phase shifting angle optimizing distribution method - Google Patents
A kind of public network based on genetic algorithm/isolated network cooperation phase shifting angle optimizing distribution method Download PDFInfo
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- CN108493944A CN108493944A CN201810435644.1A CN201810435644A CN108493944A CN 108493944 A CN108493944 A CN 108493944A CN 201810435644 A CN201810435644 A CN 201810435644A CN 108493944 A CN108493944 A CN 108493944A
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- phase shifting
- shifting angle
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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
- H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
- H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected networks
Abstract
A kind of public network based on genetic algorithm/isolated network cooperation phase shifting angle optimizing distribution method, belongs to power field.This method step is：Design fitness function；The a variety of Rectification Power Factor phase shifting angle combinations of random initializtion, and ensure that initialization value is within the scope of practical operation；The fitness function value under various corresponding harmonic value combinations is calculated separately, winning individual is selected from group, eliminates worst individual, carries out selection operation；Crossover operation is carried out to the combination retained in previous step, the part-structure of two parent individualities is replaced the operation for recombinating and generating new individual；It repeats the above steps, until fitness function value restrains, obtains optimal phase shifting angle combination, ensure that harmonic content is minimum.By using this method, the analysis most with the even phase shifting angle method of salary distribution to the Rectification Power Factor under isolated network/public network cooperation state may be implemented, ensure that harmonic component is minimum, reduce the influence to public network/isolated network related electric equipment.
Description
Technical field
The present invention relates to power fields, more particularly to a kind of public network/isolated network cooperation phase shifting angle optimizing distribution method.
Background technology
In ideal pure electric system, electric current and voltage are all pure sine waves.In fact, when electric current flow through with it is added
When voltage load not in a linear relationship, non-sinusoidal current is just formed.In the letter containing only linear element (inductance, capacitance and resistance)
In single circuit, the electric current flowed through is directly proportional to institute's making alive, so if added voltage is sine, the electric current flowed through is just
It is sinusoidal.It is noted that in the occasion for having wattless component, voltage and current phase there are one when relative movement, power because
Number is lower, but circuit is still linear.Any periodic waveform can be divided into a fundamental frequency sine plus many harmonic frequencies
It is sinusoidal.Harmonic frequency is the integral multiple of fundamental frequency.
Metallurgical electrolysis high-current dc power supply passes through the rectification that is made of rectifier transformer and silicon rectifier by alternating current
What device obtained.When fairing accesses sinusoidal voltage operation of power networks, each arm of rectifier is connected in turn, by the electric current of rectifier arm
The approximate rectangular wave of waveform, so the current waveform in each phase coil of rectifier transformer is nor sine wave, this waveform remove fundamental wave
Contain individual harmonic current outside electric current.When there is phase controlling (such as thyristor rectifier), pilot angle is bigger, then the fluctuating of electric current is cured
Greatly, harmonic components are bigger in current on line side.It is assumed that the on and off of silicon rectifier cell or thyristor is all instantaneous, then rectification
The arm electric current of device is rectangular wave, and valve side line electric current is also rectangular wave, and network side current waveform then regards fairing and wiring difference
And there are 2 kinds of rectangular wave and staircase waveform.Rectangular wave and staircase waveform can be decomposed into fundametal compoment harmony wavelength-division with fourier series
Amount, have f (wt)=| f (wt+ π), without even-order harmonic component and DC component in harmonic wave, therefore, fairing is 1 odd times
Harmonic source will be such that net side waveform changes.
The harm of harmonic wave is in particular in the following aspects：
(1) Harmonics amplification caused by power capacitor.Since the self character of capacitor can make it make in harmonic voltage
Capacitive reactance under is more much smaller than the capacitive reactance in the case where fundamental voltage acts on, to make the wave distortion of harmonic current influence more than humorous
The wave distortion of wave voltage.If capacitor also with power grid in other elements occur resonance if, the harmonic voltage of very little can
Cause prodigious harmonic current, is damaged because of overcurrent so as to cause capacitor.
(2) increase the loss of electric rotating machine.Cause added losses and overheat, followed by generates mechanical oscillation, noise harmony
Wave overvoltage.These will shorten the service life of motor, and motor can be damaged when situation is serious.
(3) loss for increasing power transmission line, shortens the power transmission line service life.Harmonic current generates harmonic wave pressure drop on transmission line of electricity
The current effective value on transmission line of electricity is also added simultaneously, so as to cause additional transmission losses.It is humorous in the case of cable power transmission
Wave is other than causing added losses, it is also possible to so that voltage waveform spike is occurred, to accelerate the aging of cable insulation, cause to impregnate
The shelf depreciation of insulation also increases dielectric loss and Wen Sheng increases, the harmonic wave control of low-voltage, high-current rectifier and idle benefit
Repay the service life that technology shortens cable with application.
(4) increase the loss of transformer.When harmonic current inflow transformer, mainly influence to be the increase in its copper loss
Consumption.Under the action of higher harmonic voltage, kelvin effect and kindred effect are more serious, cause additional copper loss in the windings, together
When also iron loss is made accordingly to increase.For the transformer with asymmetric load, if containing DC component in load current, meeting
The magnetic circuit of transformer is caused to be saturated, to which the harmonic component of AC excitation electric current can be greatly increased.
(5) cause relay protection, automatic device work disorderly.The presence of harmonic wave is possible to change the action of protective relay
Characteristic, this is related with the design feature of relay and principle.When there is current or voltage to have distortion, by sampled data or zero passage
The digital relay of work easy tos produce error.Harmonic wave can play tripping to relays such as overcurrent, under-voltage, distance, cycles
With the influence of malfunction, protective device failure and action are unstable.
(6) cause the error of power measurement.Common measuring instrumentss are verified in pure sine wave, if
The waveform of power supply is distorted, and instrument then easy tos produce error.For example, induction type electric energy meter is to the frequency other than design parameter
Respond insensitive, frequency is higher, and error is bigger, and is negative error, and when frequency is about, kilowatt-hour meter will stop operating.
(7) interference communications system.Balanced balanced current in power network is little to the interference of communication system, but if being uneven
Electric current or unbalanced harmonic current can then generate very big interference to communication system, harmonic wave interference can cause communication system
The noise of system, reduces the quality of call, and when serious interference may cause the loss of signal, or even cause personal safety accident.
(8) delay arc extinction.On the long distance transmission line of super-pressure, larger harmonic current can delay electric arc to put out
It goes out, single-pole reclosing is caused to fail, and then expand accident.Larger harmonic component can equally prolong in arc suppression coil earthing system
Late or the arc extinguishing of arc suppression coil is hindered to act on.Harmonic component can also make value when current over-zero excessive, cause breaker current interruption tired
Difficulty influences cutout abilities.
To the positioning of power quality other than frequency of use and voltage the two indexs, harmonic wave inevitably becomes weighing apparatus
Another important indicator of amount power quality.Therefore, either from ensure electric system safe and stable, economical operation angle,
Or safety, the angle of normal work from user power utilization equipment, all should effectively administer harmonic wave there are the problem of, control fair
Perhaps in range.
Invention content
It is exceeded the present invention be directed to now result in harmonic content in Isolated Network System, then cause Isolated Network System to run electrical
Situations such as insulation ag(e)ings such as equipment, protective device damage, cause false protection occurs, and influences Isolated Network System operational safety.In the presence of
Shortcoming, propose a kind of public network based on genetic algorithm/isolated network cooperation phase shifting angle optimizing distribution method.
The technical scheme is that such：
To solve the matching problem in power plant and Rectification Power Factor phase shifting angle under the point-to-point method of operation of electrolytic aluminium factory, the present invention
The optimizing distribution method of Rectification Power Factor phase shifting angle is explored by genetic algorithm optimization mode.
Phase shifting angle optimizing distribution method the specific steps are：
Step 1：Design fitness function.Because the objective optimization value of the present invention is harmonic wave yield, therefore designed
Fitness function should be harmonic value corresponding under the different phase shifting angle methods of salary distribution.
Step 2：The a variety of Rectification Power Factor phase shifting angle combinations of random initializtion, and ensure that initialization value is in practical operation range
It is interior.
Step 3：The fitness function value under various corresponding harmonic value combinations is calculated separately, is selected from group winning
Individual, eliminate worst individual, carry out selection operation.The present invention is using roulette wheel selection, i.e., the selection of each individual
Those of probability is directly proportional with its fitness value, and reservation harmonic value is smaller combination.
Step 4：Crossover operation is carried out to the combination retained in step 3, the part-structure of two parent individualities is subject to
Replace the operation for recombinating and generating new individual.The crossover operator that the present invention uses intersects for single-point, i.e., is set at random in individual is gone here and there
A fixed crosspoint, when carrying out intersection, two body portion structures before or after the point are interchangeable, and generate new combination.
Step 5：Step 3 and step 4 are repeated, until fitness function value restrains, optimal phase shifting angle combination is obtained, protects
It is minimum to demonstrate,prove harmonic content.
The beneficial effects of the invention are as follows：By using the method for the present invention, may be implemented to isolated network/public network cooperation state
Under analysis of the Rectification Power Factor most with the even phase shifting angle method of salary distribution, ensure that public network/isolated network harmonic component is minimum, reduce to public network/
The influence of isolated network related electric equipment reduces the equipment maintenance cost caused by harmonic wave.
Description of the drawings
Isolated network harmonic content schematic table when Fig. 1 is different Rectification Power Factor matchings under isolated power grid mode.
Specific implementation mode
Electrolytic aluminium factory totally 7 Rectification Power Factors, to ensure that DC side electric current is steady, rectifier transformer pairs 6 becomes in design
Depressor uses the winding mode of extend-triangle, once carries out phase shift in every Rectification Power Factor modulation, it is ensured that 84 pulse wave of DC side
It is uniformly distributed.It is operated in the case that 4 Rectification Power Factors of isolated network operate in public network in 3 Rectification Power Factors, by above-mentioned algorithm,
Obtain+4.285 ° of 1# Rectification Power Factors, -4.285 ° of 2# Rectification Power Factors ,+12.875 ° of 3# Rectification Power Factors, 4# Rectification Power Factors -
12.875 ° ,+8.751 ° of 5# Rectification Power Factors, -8.751 ° of 6# Rectification Power Factors, 0 ° of 7# Rectification Power Factors as shown in Figure 1, putting into operation two
In the case of platform Rectification Power Factor filter, the harmonic content of 5#, 6#, 7# Rectification Power Factor is lonely significantly lower than 1#, 2#, 7# Rectification Power Factor
Harmonic content when network operation.When proving isolated power grid, harmonic wave in Isolated Network System can be reduced and contain by being distribution Rectification Power Factor phase shifting angle
Amount.
Claims (1)
1. a kind of public network based on genetic algorithm/isolated network cooperation phase shifting angle optimizing distribution method, which is characterized in that phase shifting angle
Optimizing distribution method the specific steps are：
Step 1：Design fitness function.Because the objective optimization value of the present invention is harmonic wave yield, therefore designed adaptation
Degree function should be harmonic value corresponding under the different phase shifting angle methods of salary distribution.
Step 2：The a variety of Rectification Power Factor phase shifting angle combinations of random initializtion, and ensure that initialization value is within the scope of practical operation.
Step 3：The fitness function value under various corresponding harmonic value combinations is calculated separately, winning is selected from group
Body eliminates worst individual, carries out selection operation.The present invention is using roulette wheel selection, i.e., the select probability of each individual
It is directly proportional with its fitness value, retain those of the smaller combination of harmonic value.
Step 4：Crossover operation is carried out to the combination retained in step 3, the part-structure of two parent individualities is replaced
Recombinate and generate the operation of new individual.The crossover operator that the present invention uses intersects for single-point, i.e., sets one at random in individual is gone here and there
A crosspoint, when carrying out intersection, two body portion structures before or after the point are interchangeable, and generate new combination.
Step 5：Step 3 and step 4 are repeated, until fitness function value restrains, optimal phase shifting angle combination is obtained, ensures humorous
Wave amount is minimum.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810435644.1A CN108493944B (en) | 2018-05-02 | 2018-05-02 | Public network/isolated network combined operation phase shift angle optimization distribution method based on genetic algorithm |
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| CN201810435644.1A CN108493944B (en) | 2018-05-02 | 2018-05-02 | Public network/isolated network combined operation phase shift angle optimization distribution method based on genetic algorithm |
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| CN108493944A true CN108493944A (en) | 2018-09-04 |
| CN108493944B CN108493944B (en) | 2021-05-18 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103248053A (en) * | 2013-05-21 | 2013-08-14 | 华北电力大学 | Harmonic suppression device for shunt controllable reactor |
| CN203398801U (en) * | 2013-06-26 | 2014-01-15 | 国家电网公司 | Wind turbines and wind power generation station |
| CN105305463A (en) * | 2015-11-20 | 2016-02-03 | 江苏省电力公司盐城供电公司 | Reactive power optimization method based on stochastic load flow with consideration of photovoltaic power generation and harmonic pollution |
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2018
- 2018-05-02 CN CN201810435644.1A patent/CN108493944B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103248053A (en) * | 2013-05-21 | 2013-08-14 | 华北电力大学 | Harmonic suppression device for shunt controllable reactor |
| CN203398801U (en) * | 2013-06-26 | 2014-01-15 | 国家电网公司 | Wind turbines and wind power generation station |
| CN105305463A (en) * | 2015-11-20 | 2016-02-03 | 江苏省电力公司盐城供电公司 | Reactive power optimization method based on stochastic load flow with consideration of photovoltaic power generation and harmonic pollution |
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| CN108493944B (en) | 2021-05-18 |
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