CN109347104A - A kind of power grid purification method and UPS power supply-distribution system - Google Patents
A kind of power grid purification method and UPS power supply-distribution system Download PDFInfo
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- CN109347104A CN109347104A CN201811018092.0A CN201811018092A CN109347104A CN 109347104 A CN109347104 A CN 109347104A CN 201811018092 A CN201811018092 A CN 201811018092A CN 109347104 A CN109347104 A CN 109347104A
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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
- H02J3/01—Arrangements for reducing harmonics or ripples
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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
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads
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- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
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- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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- 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
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
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- Power Engineering (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
This application discloses a kind of power grid purification methods, the power grid purification method is applied to uninterruptible power supply (UPS, uninterruptible power supply) in power supply-distribution system, the power grid purification method includes: that the total current in the UPS power supply-distribution system is fed back to UPS, and the total current is the input current of the first nonlinear load and the sum of the input current of the UPS；Judge whether the total current waveform quality meets preset condition by UPS；If the total current waveform quality is unsatisfactory for the preset condition, the input current for adjusting the UPS makes the total current power factor meet the preset condition.By the above-mentioned means, UPS power supply-distribution system can improve the waveform quality of total current by constantly adjusting the input current of UPS, in the case where not needing that power factor correcting additionally is added, electric network pollution is reduced.
Description
Technical field
This application involves power domain more particularly to a kind of power grid purification method and UPS power supply-distribution systems.
Background technique
Nowadays all activities of the mankind all be unable to do without various electrical equipments, therefore power supply of the modern life to power grid
More stringent requirements are proposed for equipment, and uninterruptible power supply (UPS, uninterruptible power supply) system is in high quality
Power supply system play an important role, UPS is a kind of to set containing energy storage device, by the power protection of main element of inverter
Standby, in power failure or city's electrical anomaly, UPS can take over alternating current and persistently supply electric power, guarantee the stability and customer electricity of electric power
Safety is avoided because city's electrical anomaly is by unnecessary loss.
As shown in Figure 1, what is connect due to UPS is nonlinear load, electric current I1 exists big for traditional UPS power supply-distribution system
Harmonic wave is measured, but UPS has PFC (PFC, power factor correction) function, therefore the input of UPS
The harmonic content of electric current I2 is lower, the total current that the less electric current I2 of the electric current I1 combination harmonic content with a large amount of harmonic waves is obtained
I is the higher high quality waveform of power factor, but this is ideal situation, and in practical applications, power grid is set in addition to UPS
Except standby, can also there be the first nonlinear load in multiple non-linear equipments such as Fig. 2, the first nonlinear load and UPS are simultaneously
Column are present in power grid.As shown, although UPS can guarantee the waveform quality of electric current I2, the first nonlinear load institute
Electric current I3 on branch road is there are the non-sinusoidal waveform of a large amount of harmonic waves, so that there is also a large amount of humorous by total current I=I2+I3
Wave, power factor are reduced, are polluted to power grid.It, can be in order to improve the waveform quality of the first nonlinear load input current
Increase active power factor correction device (AFPC, active power factor correct) on power grid, total current is fed back
Calculating compensation is carried out according to feedback current to AFPC, AFPC, to power grid injecting compensating electric current, for compensating the first nonlinear load
The harmonic current I3 of generation so that total current I=I2+I3+I4 is also high quality sine wave.
Although aforesaid way can improve whole current quality by AFPC device injecting compensating electric current, increase
The cost of compensation.
Summary of the invention
This application provides a kind of power grid purification methods, and the input current by controlling UPS reaches improvement total current waveform
The purpose of quality reduces the pollution of power grid in the case where not needing that power factor correcting additionally is added.
In view of this, first aspect present invention provides a kind of power grid purification method, the power grid purification method is applied to
UPS power supply-distribution system, the power grid purification method include:
Total current in the UPS power supply-distribution system is fed back into UPS, the total current is the defeated of the first nonlinear load
Enter the sum of the input current of electric current Yu the UPS；
Judge whether the total current waveform quality meets preset condition by UPS；
If the total current waveform quality is unsatisfactory for the preset condition, the input current for adjusting the UPS makes institute
It states total current power factor and meets the preset condition.
The embodiment of the present application judges whether the input total current of feedback meets preset condition by UPS first, if discontented
Sufficient preset condition then illustrates that the input current pollution of power grid is very big, needs the waveform to input total current to improve, changed
Kind mode is to make total current become the higher sine waveform of power factor, this kind of side by adjusting the input current of UPS
Formula solves the problems, such as electric network pollution it is not necessary that additional power factor correcting is added at low cost.
In conjunction with the embodiment of the present application in a first aspect, in the first embodiment of the embodiment of the present application first aspect, institute
It states and judges whether the total current waveform quality meets preset condition and include: by UPS
Judge whether the harmonic component that the total current includes is lower than preset threshold；
Or,
Judge whether the phase angle of the total current and the input voltage of UPS meets preset requirement.
The quality condition energy of total current is judged by the phase angle between the input voltage of harmonic component, total current and UPS
The quality condition of total current is enough accurately tracked, determines electric network pollution degree, is conducive to carry out subsequent step, i.e., whether to UPS's
Input current is adjusted.
In conjunction with the first embodiment of the embodiment of the present application first aspect, the second of the embodiment of the present application first aspect
In kind embodiment, the input current of the adjustment UPS includes:
The input current of the UPS by sinusoidal waveform is adjusted to nonsinusoidal waveform so that the total current include it is humorous
Wave component meets preset requirement lower than the phase angle of preset threshold or the total current and the input voltage of the UPS.
The high quality sine wave waveform of UPS is adjusted to non-sinusoidal waveform waveform, compensating non-linear load bring is come with this
The larger problem of current harmonic content reaches purification power grid so that total current becomes the preferable sine wave of waveform quality
Purpose.
In conjunction with the embodiment of the present application in a first aspect, in the third embodiment of the embodiment of the present application first aspect, if
The total current waveform quality meets the preset condition, then keeps the input current of the UPS constant.
In conjunction with second of embodiment of the embodiment of the present application first aspect, the 4th of the embodiment of the present application first aspect the
In kind embodiment, after the input current of the adjustment UPS, the method also includes:
The input current of the UPS adjusted is added to obtain total current with the input current of first load；
If the power factor of the total current meets the preset condition, keep the input current of the UPS constant.
The power factor of total current is judged again after the input current for adjusting UPS, examines and this time adjusts
The waveform quality of total current whether is made to reach preset requirement, by constantly adjusting UPS input current and looping to determine total current
The mode of quality gradually optimizes total current, reduces electric network pollution.
Second aspect of the present invention provides a kind of UPS power supply-distribution system, comprising:
The first branch and second branch, the first branch include the first nonlinear load, and second branch includes second non-
Linear load and UPS, second nonlinear load and UPS series connection, the input current of first nonlinear load are
Non-sinusoidal waveform with a large amount of harmonic components；
The first branch and the second branch are in parallel.
The application is suitable for typical UPS power supply-distribution system, and it is not necessary that any hardware device is added, can to carry out power grid net
Change, reduce purification cost, there is practicability.
In conjunction with the embodiment of the present application second aspect, in the first embodiment of the embodiment of the present application second aspect, institute
Stating UPS power supply-distribution system includes processor, and the processor is used for:
Total current in the UPS power supply-distribution system is fed back into UPS, the total current is the defeated of the first nonlinear load
Enter the sum of the input current of electric current Yu the UPS；
Judge whether the total current waveform quality meets preset condition by UPS；
When the total current waveform quality is unsatisfactory for preset condition, adjust the UPS input current make it is described total
The power factor of electric current meets preset condition.
In conjunction with the first way of example of the embodiment of the present application second aspect, the of the embodiment of the present application second aspect
It is described to judge whether the total current power factor meets preset condition and include: by UPS in two kinds of embodiments
Judge whether the harmonic component that the total current includes is lower than preset threshold；
Or,
Judge whether the phase angle of the total current and the input voltage of UPS meets preset requirement.
In conjunction with the first embodiment of the embodiment of the present application second aspect, in the third of the embodiment of the present application second aspect
In kind embodiment, the processor is also used to:
When the total current waveform meets preset condition, keep the input current of the UPS constant.
In conjunction with the third embodiment of the embodiment of the present application second aspect to second aspect, in the embodiment of the present application second
In 4th kind of embodiment of aspect, the UPS includes rectification circuit, inverter and discharge/charge electric appliance, and the UPS has power
Factor correcting function.
As can be seen from the above technical solutions, the application has the following advantages:
Power grid purification method provided by the present application by UPS to power grid input total current waveform quality judge, if
The waveform quality of total current does not meet preset condition, then is adjusted to UPS input current to reach optimization input total current
The purpose of waveform quality is subtracted in the case where not needing that power factor correcting additionally is added by controlling UPS input current
Few electric network pollution.
Detailed description of the invention
Fig. 1 is typical UPS power supply-distribution system；
Fig. 2 is another UPS power supply-distribution system in the embodiment of the present application；
Fig. 3 is the structural schematic diagram of UPS in the embodiment of the present application；
Fig. 4 is the structural schematic diagram that power grid is purified using power factor correcting；
Fig. 5 is the structural schematic diagram using capacitor and inductor combination purification power grid；
Fig. 6 is the flow diagram of power grid purification in the embodiment of the present application；
Fig. 7 is the structural schematic diagram of power grid purification in the embodiment of the present application；
Fig. 8 is not adjust each section waveform diagram before UPS input current；
Fig. 9 is each section waveform diagram after being adjusted to UPS input current.
Specific embodiment
This application provides the UPS power supply-distribution systems that a kind of power grid purification method and the method are applied, and pass through judgement
The quality condition of input total current correspondingly makes adjustment to the input current of UPS, so that the power factor of input total current
Meet preset condition, to improve the power factor of UPS power supply-distribution system, reduces electric network pollution.
The description and claims of this application and term " first ", " second ", " third ", " in above-mentioned attached drawing
The (if present)s such as four " are to be used to distinguish similar objects, without being used to describe a particular order or precedence order.It should manage
The data that solution uses in this way are interchangeable under appropriate circumstances, so that the embodiments described herein can be in addition to illustrating herein
Or the sequence other than the content of description is implemented.In addition, term " includes " and " having " and their any deformation, it is intended that
Cover it is non-exclusive include, for example, containing the process, method, system, product or equipment of a series of steps or units need not limit
In step or unit those of is clearly listed, but may include be not clearly listed or for these process, methods, produce
The other step or units of product or equipment inherently.
The structure composition of typical ups system is as shown in figure 3, mainly include that rectifier, inverter and discharge/charge electric appliance three are big
Part.Wherein, the process that exchange is converted to direct current in main input is actually the process rectified, can be complete by fairing
At, rectifying part, there are two effects, first is that the ac voltage rectifier of main road is supplied to after filtering at steady dc voltage
Inverter；Second effect is can to provide charging voltage to battery, is equivalent to the effect of charger.Discharge/charge electric appliance is in alternating current
When normal, chemical energy can be converted electric energy to and stored, when alternating current breaks down, discharge/charge electric appliance again converts chemical energy
Inverter or load are supplied to for electric energy.Since the input voltage of exchange is become DC voltage by rectifier, and needed for loading
Be alternating voltage, therefore the inverter in figure is responsible for converting direct current into alternating current and is supplied to load.
The structural schematic diagram of power supply-distribution system comprising above-mentioned UPS device is as described in Figure 1, and the alternating current in power grid is output to
In ups system, UPS includes rectification and inversion two parts, and rectification is responsible for the alternating current in power grid being transformed into direct current, inverter
Direct current is transformed into alternating current required for load, when powering to the second nonlinear load, due to being nonlinear load, because
Electric current I1 in this figure can have a large amount of harmonic waves.The frequency of harmonic current is the integral multiple of fundamental frequency, therefore works as high-frequency current
When flowing through conductor, conductor can be made to increase the effective resistance of harmonic current because of kelvin effect, to increase the power of equipment
It is lost, reduces the reliability of power supply-distribution system.But on the other hand again because the rectifier of UPS has PFC
The function of (PFC, power factor correct), therefore can guarantee the harmonic content contained in the input current I2 of UPS
Very little, the effect of PFC are compensated to the Current Voltage of UPS so that the phase difference of input current and input voltage is sufficiently small
And the harmonic content contained in electric current is smaller.The cosine of phase difference is known as power factor, therefore phase difference between voltage and electric current
Smaller, power factor is higher, and waveform quality is better.Power factor is used to indicate that load characteristic degree, is generally indicated with PF,
Its numerical value is from 0 to 1, for example power factor is 1, means that this load is purely linear, if power factor is 0, with regard to table
Show that this load is capacitive or perception.
But often there are multiple nonlinear loads in mature complete UPS power supply-distribution system, such as such as Fig. 2 institute
Show, a nonlinear load more than UPS power supply-distribution system ratio Fig. 1 shown in Fig. 2, the first branch includes that switch and first are non-linear
Load, second branch includes UPS and the second nonlinear load, and the first branch and second branch parallel connection are hung on power grid.Work as electric current
When flowing through nonlinear load, the electric current and voltage being added on the nonlinear load be not in a linear relationship, just forms non-sinusoidal current,
To generate harmonic wave, therefore the input current I1 and I3 in figure are the non-sinusoidal waveform with a large amount of harmonic components, and since UPS has
The function of power factor correction can eliminate a large amount of harmonic components, therefore the electric current I2 in figure is the higher height of power factor
Quality sine wave, amplitude and frequency are all kept constant, and the waveform that instantaneous value sinusoidally changes is known as sine wave, therefore this
Kind waveform harmonics content is small.
First nonlinear load is in parallel with the second branch comprising the second nonlinear load and UPS, due to first non-linear
The input current I3 of load has a large amount of harmonic components, therefore input current I3 and the UPS input current of the first nonlinear load
The sum of I2 is that total current I is also the low quality electric current with a large amount of harmonic components, will so be polluted to power grid.
The problems such as in order to solve because of nonlinear load bring electric network pollution, usually on power grid increase active power because
Number means for correcting APFC, as shown in figure 4, before APFC is added, total current I is fed back to APFC first by system, APFC according to
Feedback current I carries out calculating compensation, using APFC to power grid injecting compensating electric current I4, generates for compensating the first nonlinear load
Harmonic current I3, so, the sum of electric current of I2, I3, I4 then be system total current, wherein I2 be power factor compared with
High high quality sine wave, I3 are low-quality non-sinusoidal waveform, and I4 is compensation electric current, for compensating I3, and just because of there is benefit
Electric current I4 is repaid, so the generally high quality sine wave of I3 and I4, and I2 itself is high quality sine wave, thus whole system
Total current I is also the higher high quality sine wave of power factor.
In addition to this, there are also a kind of methods for compensating electric current I3, as shown in figure 5, i.e. passively using inductance L and capacitor C
It carries out to current compensation, low quality electric current I3 caused by being compensated by compensation electric current I4 because of the first nonlinear load, to protect
Demonstrate,prove the waveform quality of total current I.
Above-mentioned is to pass through addition by power factor correcting and in such a way that inductance, capacitor are passively compensated
Electric current I4 is compensated to compensate the input current I3 of the first nonlinear load, wherein system passes through the switch control APFC of branch road
With the access of inductance capacitance combination.
Although above scheme can also improve the waveform quality of output end, need to put into APFC or inductance, capacitor etc.
Equipment increases system cost, therefore the embodiment of the present application provides a kind of power grid purification method, can low cost, expeditiously
Improve the waveform quality of power grid output end, reduce harmonic component, achievees the purpose that purify power grid.
The flow diagram of power grid purification method provided by the embodiments of the present application is as shown in Figure 6:
Power grid purification method in the embodiment of the present application is applied in typical case's UPS power supply-distribution system, in conjunction with Fig. 6 and Fig. 7 into
Row detailed description:
101, the total current in the UPS power supply-distribution system is fed back into UPS, the total current is the first nonlinear load
Input current and the UPS the sum of input current；
Total current I in Fig. 7 is the sum of the input current I2 of the input current I3 and UPS of the first nonlinear load, will be total
Electric current I, which is fed back to, carries out Quality estimation in UPS.
Presence in the embodiment of the present application due to nonlinear load cause the Harmonics of Input content of nonlinear load compared with
Height, i.e. I3 in Fig. 7 is the non-sinusoidal waveform waveform with multiple Wave crest and wave troughs, although UPS has the function of PFC,
It can guarantee that the input current I2 power factor of UPS is higher, but total current I is the input current and UPS of nonlinear load
The sum of input current, therefore input current may be still the lower low quality waveform of power factor.
102, judge whether the total current waveform quality meets preset condition by UPS；
Since UPS has the function of PFC, the poor input total current of waveform quality can be fed back
It is handled into UPS.
Phase difference and electric current in the embodiment of the present application between the quality and input current, input voltage of waveform quality is humorous
Wave content is related: on the one hand, the phase difference between input current and input voltage is smaller, and power factor is higher, and waveform quality is got over
It is good；On the other hand, harmonic content contained in electric current is fewer, and power factor is higher, and waveform quality is better.Therefore the application is implemented
The sum of input current of the input current of nonlinear load and UPS i.e. input total current is fed back to UPS and judged by example, if
Input total current meets preset condition, illustrates that input waveform is high-quality, without carrying out related adjustment, on the contrary it is then illustrate there may be
A large amount of harmonic components and reactive component.
If 103, the total current waveform quality is unsatisfactory for the preset condition, the input current for adjusting the UPS makes
It obtains the total current power factor and meets the preset condition.
Since UPS has the function of PFC, the input current of UPS is that power factor is higher, waveform matter
Measure preferable sine waveform.But since there is also nonlinear load, the input electricity of nonlinear load in the power supply-distribution system
It is non-sinusoidal waveform that conductance, which causes the waveform of total current I, and there are phase differences between input voltage U, i.e. explanation exists a large amount of humorous
Wave component and reactive component.The embodiment of the present application by adjusting the input current of UPS waveform so that UPS input current and
The sum of input current of two nonlinear loads is the standard sine wave that total current becomes high quality, specifically: total current and input
It is less to meet harmonic component contained by preset requirement or total current for phase angle between voltage U.
Optionally, on the basis of the above embodiments, the another implementation of power grid purification method provided by the embodiments of the present application
It is described to judge whether the total current power factor meets preset condition and include: by UPS in example
Judge whether the harmonic component that the total current includes is lower than preset threshold；
Or,
Judge whether the phase angle of the total current and the input voltage of UPS meets preset requirement.
The specific practice for judging whether total current power factor meets preset condition in the embodiment of the present application includes: that judgement is total
Whether the harmonic component that electric current includes is lower than preset threshold, if harmonic content is lower in total current, illustrates that the electric current is power
The higher high quality waveform of factor.On the other hand, can whether full by judging the phase angle of the input voltage of total current and UPS
Sufficient preset requirement, if it is satisfied, also implying that power factor is higher, wherein a kind of optimal situation is total current and UPS
Phase angle between input voltage is 0, since phase cosine of an angle is power factor, the power factor when phase angle is 0
It is maximum.
Optionally, on the basis of the above embodiments, the another implementation of power grid purification method provided by the embodiments of the present application
In example, the input current of the adjustment UPS includes:
The input current of the UPS is adjusted to nonsinusoidal waveform so that the total current power factor by sinusoidal waveform
Meet preset condition.
The input current of UPS is adjusted so that the total current that the input current obtains in conjunction with nonlinear load becomes high-quality
Waveform is measured, as shown in fig. 7, making to input the sine waveform that total current I is standard by adjusting electric current I2.Wherein specific one
Kind adjustment mode, which can be, is adjusted to non-sinusoidal waveform by the sine wave of standard for the input current I2 of UPS.Before adjustment
Waveform is as shown in figure 8, the input current I2 of UPS is that harmonic component is less since UPS is with power factor emendation function
Sine waveform, and input current and input voltage U same-phase, but due to the presence of load current I3, lead to total current I's
Waveform is non-sinusoidal waveform waveform, and there are phase angles with input voltage U, that is, there is a large amount of harmonic waves and reactive component.It adjusted
Waveform afterwards is as shown in figure 9, be adjusted to have harmonic component from the less sinusoidal waveform of harmonic component for UPS input current I2
Non-sinusoidal waveform waveform, on the other hand, load current I3 is also the non-sinusoidal waveform with harmonic component, but what the two combination obtained
Total current I is the sinusoidal waveform of standard, total current and total voltage U same-phase, i.e. expression total current is that power factor is higher
High quality electric current, to play the effect of purification power grid.
The embodiment of the present application by adjusting UPS input current so that UPS input current combines second nonlinear load
Input current obtains the total current of high quality, achievees the purpose that purify power grid.
Optionally, on the basis of the above embodiments, the another implementation of power grid purification method provided by the embodiments of the present application
In example,
If the total current waveform quality meets the preset condition, keep the input current of the UPS constant.
The embodiment of the present application is to input total current as the quality feelings of object Cutoff current by way of judging power factor
Whether condition meets preset requirement to electric current in particular by the phase angle judged between harmonic content, total current and input voltage
Quality is determined, if the harmonic content at the phase angle or total current of the total current and input voltage meets preset want
It asks, then without being adjusted to the input current of UPS.
Optionally, on the basis of the above embodiments, please continue to refer to Fig. 7, power grid purification provided by the embodiments of the present application
In the another embodiment of method, after the input current of the adjustment UPS, the method also includes:
It is after the input current I2 to UPS is adjusted, the input current of the UPS adjusted and first is non-thread
Property load input current I3 be added to obtain total current I, total current I is judged again, it is total total after judgement this time adjustment
Whether electric current reaches preset condition, likewise, total current whether reach preset condition factor of judgment be still harmonic content,
Phase angle between total current and input voltage.
It can gradually be optimized by constantly adjusting UPS input current and looping to determine total current quality in the embodiment of the present application
Total current reduces electric network pollution.
The above-mentioned power grid purification method in the embodiment of the present application is described in detail, below to power grid purification method application
UPS power supply-distribution system be described in detail, please refer to Fig. 7:
The first branch includes the first nonlinear load and switch, and second branch includes the second nonlinear load, UPS and opens
It closes, the first branch and second branch parallel connection are hung on power grid；
The total current I of power grid shunts to form I3 and I2, and I3 is the input current of the first nonlinear load, and I2 is flow to through switch
UPS device is supplied to the second nonlinear load by the rectification and inversion of UPS, is accessed due to the first branch and second branch
It is all nonlinear load, therefore the input current I1 and I3 of two loads are the non-sinusoidal waveform with a large amount of harmonic waves, and because UPS
Device have power factor emendation function, therefore the input current I2 of UPS be sinusoidal waveform, therefore I2 and I3 converge to be formed it is total
Electric current I is also non-sinusoidal waveform waveform；
In conjunction with the power grid purification method in the embodiment of the present application, the total current I in UPS power supply-distribution system is subjected to electric current and is adopted
Sample, and total current is fed back in UPS and is judged, UPS judges whether total current waveform quality meets preset condition, if full
Foot illustrates that inputting total current I is high quality waveform, then carries out related adjustment without the input current I2 to UPS, if not satisfied,
It then needs to be adjusted the input current of UPS, non-sinusoidal waveform is adjusted to by the sine wave of standard, so that the total current of I3 and I2
I is the sine wave of standard.As shown in fig. 7, I2 is non-sinusoidal waveform waveform, and I3 itself is non-sine waveform after being adjusted,
But the total current I after I2 and I3 combination is the sine waveform of standard, the waveform diagram of each section such as Fig. 7 institute after adjustment
Show.
The adjustment of waveform can be realized without increasing additional equipment in UPS power supply-distribution system in the embodiment of the present application, leads to
The input current for crossing control UPS improves the waveform quality of input terminal, greatly reduces harmonic content contained by total current, reduces
The loss of equipment has achieved the purpose that purify power grid.
Processor in the embodiment of the present application in UPS power supply-distribution system can be used for executing following steps:
Input total current in the UPS power supply-distribution system is fed back into UPS, the total current is the first nonlinear load
Input current and the UPS the sum of input current；
Judge whether the total current waveform quality meets preset condition by UPS；
When the total current waveform quality is unsatisfactory for preset condition, the input current for adjusting the UPS makes total current
Power factor meets preset condition.
In the above-described embodiments, can come wholly or partly by software, hardware, firmware or any combination thereof real
It is existing.When implemented in software, it can entirely or partly realize in the form of a computer program product.
The computer program product includes one or more computer instructions.Load and execute on computers the meter
When calculation machine program instruction, entirely or partly generate according to process or function described in the embodiment of the present invention.The computer can
To be general purpose computer, special purpose computer, computer network or other programmable devices.The computer instruction can be deposited
Storage in a computer-readable storage medium, or from a computer readable storage medium to another computer readable storage medium
Transmission, for example, the computer instruction can pass through wired (example from a web-site, computer, server or data center
Such as coaxial cable, optical fiber, Digital Subscriber Line (Digital Subscriber Line, DSL)) or wireless (such as infrared, wireless,
Microwave etc.) mode transmitted to another web-site, computer, server or data center.It is described computer-readable to deposit
Storage media can be any usable medium that computer can store or include the integrated clothes of one or more usable mediums
The data storage devices such as business device, data center.The usable medium can be magnetic medium, (for example, floppy disk, hard disk, tape),
Optical medium (for example, DVD) or semiconductor medium (such as solid state hard disk Solid State Disk (SSD)) etc..
It is apparent to those skilled in the art that for convenience and simplicity of description, the system of foregoing description,
The specific work process of device and unit, can refer to corresponding processes in the foregoing method embodiment, and details are not described herein.
In several embodiments provided herein, it should be understood that disclosed system, device and method can be with
It realizes by another way.For example, the apparatus embodiments described above are merely exemplary, for example, the unit
It divides, only a kind of logical function partition, there may be another division manner in actual implementation, such as multiple units or components
It can be combined or can be integrated into another system, or some features can be ignored or not executed.Another point, it is shown or
The mutual coupling, direct-coupling or communication connection discussed can be through some interfaces, the indirect coupling of device or unit
It closes or communicates to connect, can be electrical property, mechanical or other forms.
The unit as illustrated by the separation member may or may not be physically separated, aobvious as unit
The component shown may or may not be physical unit, it can and it is in one place, or may be distributed over multiple
In network unit.It can select some or all of unit therein according to the actual needs to realize the mesh of this embodiment scheme
's.
It, can also be in addition, each functional unit in each embodiment of the application can integrate in one processing unit
It is that each unit physically exists alone, can also be integrated in one unit with two or more units.Above-mentioned integrated list
Member both can take the form of hardware realization, can also realize in the form of software functional units.
If the integrated unit is realized in the form of SFU software functional unit and sells or use as independent product
When, it can store in a computer readable storage medium.Based on this understanding, the technical solution of the application is substantially
The all or part of the part that contributes to existing technology or the technical solution can be in the form of software products in other words
It embodies, which is stored in a storage medium, including some instructions are used so that a computer
Equipment (can be personal computer, server or the network equipment etc.) executes the complete of each embodiment the method for the application
Portion or part steps.And storage medium above-mentioned include: USB flash disk, mobile hard disk, read-only memory (Read-Only Memory,
ROM), random access memory (Random Access Memory, RAM), magnetic or disk etc. are various can store program
The medium of code.
The above, above embodiments are only to illustrate the technical solution of the application, rather than its limitations；Although referring to before
Embodiment is stated the application is described in detail, those skilled in the art should understand that: it still can be to preceding
Technical solution documented by each embodiment is stated to modify or equivalent replacement of some of the technical features；And these
It modifies or replaces, the spirit and scope of each embodiment technical solution of the application that it does not separate the essence of the corresponding technical solution.
Claims (10)
1. a kind of power grid purification method, which is characterized in that the power grid purification method is applied to uninterruptible power supply UPS power supply and distribution system
System, the power grid purification method include:
Total current in the UPS power supply-distribution system is fed back into the UPS, the total current is the defeated of the first nonlinear load
Enter the sum of the input current of electric current Yu the UPS；
Judge whether the total current waveform quality meets preset condition, the total current waveform quality and institute by the UPS
It is related with the phase angle of the input voltage of UPS to state harmonic component, the total current that total current includes；
If the total current waveform quality is unsatisfactory for the preset condition, adjust the UPS input current make it is described total
Current power factor meets the preset condition.
2. the method according to claim 1, wherein described judge that the total current waveform quality is by UPS
The no preset condition that meets includes:
Judge whether the harmonic component that the total current includes is lower than preset threshold；
Or,
Judge whether the total current and the phase angle of the input voltage of the UPS meet preset requirement.
3. according to the method described in claim 2, it is characterized in that, the input current of the adjustment UPS make it is described total
Current power factor meets the preset condition
The input current of the UPS is adjusted to nonsinusoidal waveform so that the total current power factor meets by sinusoidal waveform
The preset condition.
4. the method according to claim 1, wherein the method also includes
If the total current waveform quality meets the preset condition, keep the input current of the UPS constant.
5. according to the method described in claim 3, it is characterized in that, after the input current of the adjustment UPS, the side
Method further include:
The input current of UPS adjusted is added to obtain total current with the input current of first load；
If the power factor of the total current meets the preset condition, keep the input current of the UPS constant.
6. a kind of UPS power supply-distribution system, which is characterized in that the UPS power supply-distribution system includes:
The first branch and second branch, the first branch include the first nonlinear load, and second branch includes second non-linear
Load and UPS, second nonlinear load and UPS series connection, the input current of first nonlinear load be with
The non-sinusoidal waveform of a large amount of harmonic components；
The first branch and the second branch are in parallel.
7. UPS power supply-distribution system according to claim 6, which is characterized in that the UPS power supply-distribution system includes processing
Device, the processor are used for:
Total current in the UPS power supply-distribution system is fed back into UPS, the total current is the input electricity of the first nonlinear load
The sum of the input current of stream and the UPS；
Judge whether the total current waveform quality meets preset condition, the waveform quality and the total current packet by UPS
Harmonic component, the total current contained is related with the phase angle of the input voltage of UPS；
When the total current waveform quality is unsatisfactory for preset condition, the input current for adjusting the UPS makes the total current
Power factor meet preset condition.
8. UPS power supply-distribution system according to claim 7, which is characterized in that described to judge the total current function by UPS
Whether rate factor meets preset condition
Judge whether the harmonic component that the total current includes is lower than preset threshold；
Or,
Judge whether the phase angle of the total current and the input voltage of UPS meets preset requirement.
9. UPS power supply-distribution system according to claim 7, which is characterized in that the processor is also used to:
When the total current waveform quality meets preset condition, keep the input current of the UPS constant.
10. power supply-distribution system according to any one of claims 6 to 9, which is characterized in that the UPS includes rectified current
Device, inverter and discharge/charge electric appliance, the UPS have power factor emendation function.
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| CN201811018092.0A CN109347104A (en) | 2018-08-31 | 2018-08-31 | A kind of power grid purification method and UPS power supply-distribution system |
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| CN201811018092.0A CN109347104A (en) | 2018-08-31 | 2018-08-31 | A kind of power grid purification method and UPS power supply-distribution system |
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