CN108964085A - Electrical equipment and its power swing suppressing method, device and system - Google Patents
Electrical equipment and its power swing suppressing method, device and system Download PDFInfo
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- CN108964085A CN108964085A CN201810795175.4A CN201810795175A CN108964085A CN 108964085 A CN108964085 A CN 108964085A CN 201810795175 A CN201810795175 A CN 201810795175A CN 108964085 A CN108964085 A CN 108964085A
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- 238000000034 method Methods 0.000 title claims abstract description 40
- 230000001629 suppression Effects 0.000 claims abstract description 4
- 230000008859 change Effects 0.000 claims description 24
- 230000005764 inhibitory process Effects 0.000 claims description 6
- 230000005611 electricity Effects 0.000 claims description 5
- 230000002401 inhibitory effect Effects 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 7
- 238000004378 air conditioning Methods 0.000 description 28
- 238000010586 diagram Methods 0.000 description 14
- 238000006243 chemical reaction Methods 0.000 description 12
- 238000004146 energy storage Methods 0.000 description 11
- 230000007704 transition Effects 0.000 description 11
- 238000009434 installation Methods 0.000 description 6
- 238000012423 maintenance Methods 0.000 description 6
- 230000006870 function Effects 0.000 description 5
- 206010033799 Paralysis Diseases 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
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Classifications
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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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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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
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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- H02J3/385—
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
-
- 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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
Abstract
The present invention discloses a kind of electrical equipment and its power swing suppressing method, device and system.The electrical equipment power swing suppressing method includes: to obtain current DC bus-bar voltage and current DC bus current with predetermined time interval；Current power variable quantity is determined according to current DC bus-bar voltage and current DC bus current；Judge whether current power variable quantity is more than or equal to predetermined power changing value；In the case where current power variable quantity is more than or equal to predetermined power changing value, at least one in current DC bus-bar voltage and current DC bus current is adjusted, so that current power variable quantity is less than predetermined power changing value.The present invention, which fluctuates suppression technology by power step, prevents energy impact, can impact to avoid step and bring damage to system, it can also be ensured that the reliable continuous operation of system.
Description
Technical field
The present invention relates to electrical equipment field, in particular to a kind of electrical equipment and its power swing suppressing method, device
And system.
Background technique
Electric network fault, project installation maintenance, polynary change of current switching at runtime, unit mode conversion etc. lead to the straight of electrical equipment
Stream busbar voltage adjustment flickering, is fallen, current over pulse, and power step fluctuation will lead to the electrical equipment system of such as light storage air-conditioning
System collapse, power grid are locally paralysed, and unit reliability and user experience are influenced.
Such as: at practical air-conditioning installation maintenance scene, busbar voltage flickering, power step fluctuation when falling be will lead to,
Voltage falls 46V, current glitches 26A within 100ms, and power step fluctuates 400W, causes unit allocation unstable, protection stops
Machine.
Summary of the invention
In view of the above technical problem, the present invention provides a kind of electrical equipment and its power swing suppressing method, device and
System can effectively inhibit the power swing of electrical equipment, avoid system crash.
According to an aspect of the present invention, a kind of electrical equipment power swing suppressing method is provided, comprising:
Current DC bus-bar voltage and current DC bus current are obtained with predetermined time interval；
Current power variable quantity is determined according to current DC bus-bar voltage and current DC bus current；
Judge whether current power variable quantity is more than or equal to predetermined power changing value；
In the case where current power variable quantity is more than or equal to predetermined power changing value, to current DC bus-bar voltage and work as
At least one in preceding DC bus current is adjusted, so that current power variable quantity is less than predetermined power changing value.
In some embodiments of the invention, the current DC bus-bar voltage of the basis and current DC bus current determine
Current power variable quantity includes:
Current voltage variable quantity, basis are obtained according to current DC bus-bar voltage and the DC bus-bar voltage of preceding one acquisition
Current DC bus current and the DC bus current of preceding one acquisition obtain current flow variable quantity；
Judge whether current voltage variable quantity is more than or equal to predetermined voltage variable quantity, whether current flow variable quantity is greater than
In scheduled current variable quantity；
It is more than or equal to predetermined voltage variable quantity in current voltage variable quantity and current flow variable quantity is more than or equal to predetermined electricity
In the case where flowing variable quantity, current power variable quantity is determined according to current voltage variable quantity and current flow variable quantity.
In some embodiments of the invention, it is described in current DC bus-bar voltage and current DC bus current extremely
One item missing, which is adjusted, includes:
Outer voltage adjusting is carried out to current DC bus-bar voltage, and current inner loop tune is carried out to current DC bus current
Section.
In some embodiments of the invention, it is described in current DC bus-bar voltage and current DC bus current extremely
It includes: to carry out outer voltage adjusting to current DC bus-bar voltage that one item missing, which is adjusted,.
In some embodiments of the invention, it is described in current DC bus-bar voltage and current DC bus current extremely
It includes: to carry out current inner loop adjusting to current DC bus current that one item missing, which is adjusted,.
In some embodiments of the invention, described to include: to the progress outer voltage adjusting of current DC bus-bar voltage
It carries out the first PID according to current DC bus-bar voltage and predetermined direct current busbar voltage to adjust, so that current power becomes
Change amount is less than predetermined power changing value.
In some embodiments of the invention, described to include: to the progress current inner loop adjusting of current DC bus current
It carries out the 2nd PID according to current DC bus current and predetermined direct current bus current to adjust, so that current power becomes
Change amount is less than predetermined power changing value.
According to another aspect of the present invention, a kind of electrical equipment power swing inhibition device is provided, comprising:
Voltage and current obtains module, for obtaining current DC bus-bar voltage and current DC bus with predetermined time interval
Electric current；
Power variation obtains module, current for being determined according to current DC bus-bar voltage and current DC bus current
Power variation；
Power variation comparison module, for judging whether current power variable quantity is more than or equal to predetermined power changing value；
Module is adjusted, is used in the case where current power variable quantity is more than or equal to predetermined power changing value, to current straight
At least one in stream busbar voltage and current DC bus current is adjusted, so that current power variable quantity is less than predetermined function
Rate changing value.
In some embodiments of the invention, the electrical equipment power swing inhibits device to realize for executing as above-mentioned
The operation of electrical equipment power swing suppressing method described in any embodiment.
According to another aspect of the present invention, a kind of electrical equipment power swing inhibition device is provided, comprising:
Memory, for storing instruction；
Processor, for executing described instruction, so that described device executes the electricity realized as described in above-mentioned any embodiment
The operation of device plant capacity fluctuation suppressing method.
According to another aspect of the present invention, a kind of electrical equipment power swing inhibition system is provided, comprising:
Electrical equipment power swing inhibits device, inhibits for the electrical equipment power swing as described in above-mentioned any embodiment
Device；
DC bus-bar voltage collection device for acquiring current DC bus-bar voltage with predetermined time interval, and is sent to
Electrical equipment power swing inhibits device；
DC bus current acquisition device for acquiring current DC bus current with predetermined time interval, and is sent to
Electrical equipment power swing inhibits device.
In some embodiments of the invention, the electrical equipment power swing inhibits system further include:
Power input voltage acquisition device for acquiring current power input voltage with predetermined time interval, and is sent to
Electrical equipment power swing inhibits device.
According to another aspect of the present invention, a kind of electrical equipment is provided, including the electric appliance as described in above-mentioned any embodiment
Plant capacity fluctuation inhibits device or includes the electrical equipment power swing inhibition system as described in above-mentioned any embodiment.
According to another aspect of the present invention, a kind of computer readable storage medium, the computer-readable storage medium are provided
Matter is stored with computer instruction, and the electrical equipment function as described in above-mentioned any embodiment is realized when described instruction is executed by processor
Rate fluctuates suppressing method.
The present invention, which fluctuates suppression technology by power step, prevents energy impact, can impact to avoid step and bring to system
Damage, it can also be ensured that the reliable continuous operation of system.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is the schematic diagram that light of the present invention stores up some embodiments of air-conditioning.
Fig. 2 is the schematic diagram of some embodiments of electrical equipment power swing suppressing method of the present invention.
Fig. 3 is the schematic diagram of other embodiments of electrical equipment power swing suppressing method of the present invention.
Fig. 4 is the schematic diagram that some embodiments of the invention outer voltage is adjusted and current inner loop is adjusted.
Fig. 5 is the schematic diagram that electrical equipment power swing of the present invention inhibits some embodiments of device.
Fig. 6 is the schematic diagram that electrical equipment power swing of the present invention inhibits other embodiments of device.
Fig. 7 is the schematic diagram that electrical equipment power swing of the present invention inhibits some embodiments of system.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Below
Description only actually at least one exemplary embodiment be it is illustrative, never as to the present invention and its application or make
Any restrictions.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work premise
Under every other embodiment obtained, shall fall within the protection scope of the present invention.
Unless specifically stated otherwise, positioned opposite, the digital table of the component and step that otherwise illustrate in these embodiments
It is not limited the scope of the invention up to formula and numerical value.
Simultaneously, it should be appreciated that for ease of description, the size of various pieces shown in attached drawing is not according to reality
Proportionate relationship draw.
Technology, method and apparatus known to person of ordinary skill in the relevant may be not discussed in detail, but suitable
In the case of, the technology, method and apparatus should be considered as authorizing part of specification.
It is shown here and discuss all examples in, any occurrence should be construed as merely illustratively, without
It is as limitation.Therefore, the other examples of exemplary embodiment can have different values.
It should also be noted that similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined in a attached drawing, then in subsequent attached drawing does not need that it is further discussed.
It is found by the applicant that: in light storage air-conditioning system, the incision excision of any one unit can all bring the huge of energy
Impact, to break original balancing energy state, needs to be re-introduced into new balancing energy state.
Therefore, the present invention impacts in order to avoid step brings damage to system, also to guarantee reliable continuous operation, need
Energy impact is prevented using power step fluctuation suppression technology.
Fig. 1 is the schematic diagram that light of the present invention stores up some embodiments of air-conditioning.As shown in Figure 1, light storage air-conditioning of the invention includes
Four macroplates: MPPT (Maximum Power Point Tracking, MPPT maximum power point tracking) is adjusted, energy is grid-connected, compression
Machine control and energy-storage units control, specifically:
MPPT operation: when control system detect photovoltaic can satisfy be incorporated to total system condition after, allow photovoltaic cut
System, MPPT then start to work, and after a certain time, re-enter into stable state, establish new dynamic equilibrium；Detect photovoltaic
When excision system, then MPPT optimal-search control is gradually backed out.
Energy cutting-in control: control system constantly detects whether power grid port is in normal condition, when network system is normal
When, if after photovoltaic energy meets equipment work requirements, entering grid connection state, photovoltaic excess energy being incorporated to AC network；
And when plant capacity is less, then need power grid to be supplemented.
Compressor control: carrying out compressor status adjustment according to customer command, and under the premise of meeting safety, compressor will
Steady operating.
Energy-storage units control: for energy-storage units in plant capacity abundance, photovoltaic and power grid can carry out certain energy to energy storage
Amount storage, and when air-conditioning and the shortage of energy of DC load, then it can release energy and meet system receiving end demand.
The present invention analyzes electric current, the voltage of DC bus based on the DC bus for connecting above-mentioned quaternary convertor unit
Change with power transience, establish physical model, devise a kind of light storage air-conditioning power swing suppressing method, solve photovoltaic side,
Grid side, air-conditioning side, energy storage side energy switching and conversion when current impact.
Electrical equipment power swing suppressing method of the present invention, device and system are carried out into one below by specific embodiment
Walk explanation.
Electrical equipment power swing suppressing method of the invention, device and system may be implemented to air-conditioning, PV air-conditioner etc.
The power swing of electrical equipment inhibits.
Fig. 2 is the schematic diagram of some embodiments of electrical equipment power swing suppressing method of the present invention.Preferably, the present embodiment
Device and system can be inhibited to execute by electrical equipment power swing.Method includes the following steps:
Step 21, current DC bus-bar voltage and current DC bus current are obtained with predetermined time interval.
In some embodiments of the invention, the predetermined time interval can be 220us.
Step 22, current power variable quantity is determined according to current DC bus-bar voltage and current DC bus current.
Step 23, judge whether current power variable quantity is more than or equal to predetermined power changing value.
Step 24, in the case where current power variable quantity is more than or equal to predetermined power changing value, to current DC bus
At least one in voltage and current DC bus current is adjusted, so that current power variable quantity changes less than predetermined power
Value.
In some embodiments of the invention, described to current DC bus-bar voltage and current DC bus in step 24
In electric current at least one of the step of being adjusted may include: that outer voltage adjusting is carried out to current DC bus-bar voltage.
In some embodiments of the invention, described to current DC bus-bar voltage and current DC bus in step 24
In electric current at least one of the step of being adjusted may include: that current inner loop adjusting is carried out to current DC bus current.
In some embodiments of the invention, described to current DC bus-bar voltage and current DC bus in step 24
In electric current at least one of the step of being adjusted may include: outer voltage adjusting is carried out to current DC bus-bar voltage, and
Current inner loop adjusting is carried out to current DC bus current.
In some embodiments of the invention, described the step of carrying out outer voltage adjusting to current DC bus-bar voltage, can
To include: to carry out the first PID according to current DC bus-bar voltage and predetermined direct current busbar voltage to adjust, so that current power changes
Amount is less than predetermined power changing value.
In some embodiments of the invention, described the step of carrying out current inner loop adjusting to current DC bus current, can
To include: to carry out the 2nd PID according to current DC bus current and predetermined direct current bus current to adjust, so that current power changes
Amount is less than predetermined power changing value.
Based on the electrical equipment power swing suppressing method that the above embodiment of the present invention provides, air-conditioning, light can be applied to
The power swing for lying prostrate the electrical equipments such as air-conditioning inhibits.It, can be in the case where the above embodiment of the present invention is applied to PV air-conditioner
Impact when the effective and reasonable energy switching and conversion for stabilizing photovoltaic side, grid side, air-conditioning side, energy storage side.The above-mentioned reality of the present invention
The operational mode that example can be different according to unit is applied, real-time tracking system energy state turns according to the operating mode of commutation system
Change demand, energy of reasonably releasing carry out smooth transition.
Fig. 3 is the schematic diagram of other embodiments of electrical equipment power swing suppressing method of the present invention.Preferably, this implementation
Example can inhibit device and system to execute by electrical equipment power swing.Method includes the following steps:
Step 31, it is spaced at predetermined time intervals, executes step 32 and step 34.
In some embodiments of the invention, as shown in figure 3, the predetermined time interval can be 220us.
Step 32, current DC bus-bar voltage U is obtaineddc；According to current DC bus-bar voltage UdcIt is straight with preceding one acquisition
Flow busbar voltage Udc0Obtain current voltage variation delta Udc, wherein current voltage variation delta UdcEqual to current DC bus
Voltage UdcWith the DC bus-bar voltage U of preceding one acquisitiondc0Difference absolute value, that is, Δ Udc=| Udc-Udc0|。
Step 33, judge current voltage variation delta UdcWhether predetermined voltage variable quantity U is more than or equal to0。
Step 34, current DC bus current I is obtaineddc；According to current DC bus current IdcIt is straight with preceding one acquisition
Flow bus current Idc0Obtain current flow variation delta Idc, wherein current flow variation delta IdcEqual to current DC bus
Electric current IdcWith the DC bus current I of preceding one acquisitiondc0Difference absolute value, that is, Δ Idc=| Idc-Idc0|。
Step 35, judge current flow variation delta IdcWhether scheduled current variable quantity I is more than or equal to0。
Step 36, in current voltage variation delta UdcMore than or equal to predetermined voltage variable quantity U0And current flow variable quantity
ΔIdcMore than or equal to scheduled current variable quantity I0In the case where, according to current voltage variation delta UdcWith current flow variation delta
IdcDetermine current power variation delta Pdc。
In some embodiments of the invention, as shown in figure 3, it is described according to current voltage variation delta UdcAnd current flow
Variation delta IdcDetermine current power variation delta PdcThe step of may include: according to current voltage variation delta UdcWith it is current
Current change quantity Δ IdcProduct determine current power variation delta Pdc。
Step 37, judge current power variation delta PdcWhether predetermined power changing value P is more than or equal to0。
Step 38 and step 39, in current power variation delta PdcMore than or equal to predetermined power changing value P0In the case where,
Outer voltage adjusting is carried out to current DC bus-bar voltage, current inner loop adjusting is carried out to current DC bus current, so that working as
Preceding power variation is less than predetermined power changing value.
In some embodiments of the invention, the method also includes: in current power variation delta PdcLess than predetermined function
Rate changing value P0In the case where or in current voltage variation delta UdcSmall predetermined voltage variable quantity U0In the case where or
Current flow variation delta IdcLess than scheduled current variable quantity I0In the case where, repeated in next predetermined time interval
Step 32 and step 34 are executed, the variable quantity for carrying out next round calculates.
The above embodiment of the present invention can be applied to the PV air-conditioner of Fig. 1 embodiment, also can be applied to other air-conditioning systems
System can also be applied to other electrical equipments, rationally to stabilize power step of the electrical equipment when energy switches and converts
Fluctuation.
The above embodiment of the present invention is in the case where being applied to the PV air-conditioner of Fig. 1 embodiment, to connect quaternary change of current list
Based on the DC bus of member, electric current, voltage and the power transience variation of DC bus are analyzed, physical model is established, devises
A kind of power swing suppressing method of light storage air-conditioning, can be improved the reliability of light storage air-conditioning, improve light storage air-conditioning mixing
Dynamic reliability under mode；Seamless switching between the polynary change of current, smooth transition may be implemented in the above embodiment of the present invention；This hair
Bright above-described embodiment is also avoided because power step fluctuation leads to light storage air-conditioning system collapse, and power grid is locally paralysed.
Fig. 4 is the schematic diagram that some embodiments of the invention outer voltage is adjusted and current inner loop is adjusted.Preferably, this implementation
Example can inhibit device and system to execute by electrical equipment power swing.It is described female to current direct current in the above embodiment of the present invention
Line voltage carries out outer voltage adjusting, and the step of carrying out current inner loop adjusting to current DC bus current may include:
Step 40, scheduled firm power equation is established in outer voltage.
Step 41, to current DC bus-bar voltage UdcWith predetermined direct current busbar voltage UrefIt makes the difference, wherein described predetermined straight
Flow busbar voltage UrefFor scheduled stable DC busbar voltage.
Step 42, according to current DC bus-bar voltage UdcWith predetermined direct current busbar voltage UrefDifference carry out the first PID
(proportion-integration-differentiation, proportional-integral-differential) is adjusted, according to predetermined firm power
Equation obtains firm power Pm。
Step 43, current power input voltage U is obtainedac；To current power input voltage UacCarry out predetermined variation K.
Step 44, according to firm power PmStabling current I is obtained with the current power input voltage after predetermined variation Kref。
In some embodiments of the invention, step 44 can specifically include: according to firm power PmAfter predetermined variation K
Current power input voltage product, obtain stabling current Iref。
Step 45, to current DC bus current IdcWith stabling current IrefIt makes the difference.
Step 46, for current DC bus current IdcWith stabling current IrefDifference carry out the 2nd PID adjust.
Step 47, after SPWM (Sinusoidal Pulse Width Modulation, sinusoidal pulse width modulation), control
The IGBT (Insulated Gate Bipolar Transistor, insulated gate bipolar transistor) of H bridge processed, so that current function
Rate variable quantity is less than predetermined power changing value, that is, inhibits power step fluctuation in controllable predetermined power changing value P0Range it
It is interior.
The outer voltage of the above embodiment of the present invention, current inner loop adjuster PID design method, such as Fig. 4.Predetermined direct current
Busbar voltage UrefWith the busbar voltage U of real-time samplingdcDifference carries out PID adjusting, obtains firm power Pm, voltage of the invention
Outer ring adjusting can cause power P with stable DC busbar voltagemStablize.Meanwhile the above embodiment of the present invention also carries out in electric current
The PID of ring is adjusted, further stabling current Idc, so as to inhibit power step to fluctuate Δ Pdc。
The above embodiment of the present invention may be implemented in electric network fault, project installation maintenance, polynary change of current switching at runtime, unit
When mode conversion, caused DC bus-bar voltage adjustment, flickering, fall, current over pulse, power step fluctuation when it is more
Power between first change of current steadily switches.The above embodiment of the present invention effective and reasonable can also stabilize photovoltaic side, grid side, electric appliance are set
Impact when the energy switching and conversion of standby side (such as air-conditioning side), energy storage side.The above embodiment of the present invention can be according to unit
Different operational modes, real-time tracking system energy state；According to the working mode transition demand of commutation system, reasonably release
Energy carries out smooth transition.
Fig. 5 is the schematic diagram that electrical equipment power swing of the present invention inhibits some embodiments of device.As shown in figure 5, described
It may include that voltage and current obtains module 51, power variation obtains module 52, power that electrical equipment power swing, which inhibits device,
Variable quantity comparison module 53 and adjustment module 54, in which:
Voltage and current obtains module 51, for obtaining current DC bus-bar voltage and current direct current mother with predetermined time interval
Line current.
In some embodiments of the invention, the predetermined time interval can be 220us.
In some embodiments of the invention, voltage and current obtain module 51 can from the hardware circuit in Fig. 4 embodiment,
Such as: DC bus-bar voltage collection device and DC bus current acquisition device obtain current DC bus-bar voltage and current straight
Flow bus current.
Power variation obtains module 52, for being worked as according to current DC bus-bar voltage and the determination of current DC bus current
Preceding power variation.
In some embodiments of the invention, power variation obtains module 52 and specifically can be used for according to current direct current mother
The DC bus-bar voltage of line voltage and preceding one acquisition obtain current voltage variable quantity, according to current DC bus current with it is previous
The DC bus current of secondary acquisition obtains current flow variable quantity；Judge whether current voltage variable quantity is more than or equal to predetermined voltage
Whether variable quantity, current flow variable quantity are more than or equal to scheduled current variable quantity；It is more than or equal in current voltage variable quantity predetermined
In the case that voltage variety and current flow variable quantity are more than or equal to scheduled current variable quantity, according to current voltage variable quantity
Current power variable quantity is determined with current flow variable quantity.
Power variation comparison module 53, for judging whether current power variable quantity is more than or equal to predetermined power variation
Value.
Module 54 is adjusted, is used in the case where current power variable quantity is more than or equal to predetermined power changing value, to current
At least one in DC bus-bar voltage and current DC bus current is adjusted, and is made a reservation for so that current power variable quantity is less than
Power change values.
In some embodiments of the invention, adjustment module 54 specifically can be used for being more than or equal in current power variable quantity
In the case where predetermined power changing value, outer voltage adjusting is carried out to current DC bus-bar voltage, so that current power variable quantity
Less than predetermined power changing value.
In some embodiments of the invention, adjustment module 54 specifically can be used for being more than or equal in current power variable quantity
In the case where predetermined power changing value, the first PID is carried out according to current DC bus-bar voltage and predetermined direct current busbar voltage and is adjusted,
So that current power variable quantity is less than predetermined power changing value.
In some embodiments of the invention, adjustment module 54 specifically can be used for being more than or equal in current power variable quantity
In the case where predetermined power changing value, current inner loop adjusting is carried out to current DC bus current, so that current power variable quantity
Less than predetermined power changing value.
In some embodiments of the invention, adjustment module 54 specifically can be used for being more than or equal in current power variable quantity
In the case where predetermined power changing value, the 2nd PID is carried out according to current DC bus current and predetermined direct current bus current and is adjusted,
So that current power variable quantity is less than predetermined power changing value.
In some embodiments of the invention, adjustment module 54 specifically can be used for being more than or equal in current power variable quantity
In the case where predetermined power changing value, outer voltage adjusting is carried out to current DC bus-bar voltage, and to current DC bus electricity
Stream carries out current inner loop adjusting, so that current power variable quantity is less than predetermined power changing value.
In some embodiments of the invention, adjustment module 54 specifically can be used for being more than or equal in current power variable quantity
In the case where predetermined power changing value, the first PID is carried out according to current DC bus-bar voltage and predetermined direct current busbar voltage and is adjusted,
Firm power is obtained according to predetermined firm power equation；Obtain current power input voltage；According to firm power and current power
Input voltage obtains stabling current；The 2nd PID is carried out for current DC bus current and stabling current to adjust；It carries out later just
String pulsewidth modulation modulation, controls the insulated gate bipolar transistor of H bridge, so that current power variable quantity changes less than predetermined power
Value.
In some embodiments of the invention, the electrical equipment power swing inhibits device to can be used for executing realization such as
The operation of electrical equipment power swing suppressing method described in any of the above-described embodiment (such as Fig. 2-Fig. 4 any embodiment).
Inhibit device based on the electrical equipment power swing that the above embodiment of the present invention provides, can be applied to air-conditioning, light
The power swing for lying prostrate the electrical equipments such as air-conditioning inhibits.It, can be in the case where the above embodiment of the present invention is applied to PV air-conditioner
Impact when the effective and reasonable energy switching and conversion for stabilizing photovoltaic side, grid side, air-conditioning side, energy storage side.The above-mentioned reality of the present invention
The operational mode that example can be different according to unit is applied, real-time tracking system energy state turns according to the operating mode of commutation system
Change demand, energy of reasonably releasing carry out smooth transition.
Fig. 6 is the schematic diagram that electrical equipment power swing of the present invention inhibits other embodiments of device.As shown in fig. 6, institute
Stating electrical equipment power swing to inhibit device may include memory 61 and processor 62, in which:
Memory 61, for storing instruction.
Processor 62, for executing described instruction, so that described device execution realization such as above-mentioned any embodiment (such as scheme
2- Fig. 4 any embodiment) described in electrical equipment power swing suppressing method operation.
The above embodiment of the present invention is in the case where being applied to the PV air-conditioner of Fig. 1 embodiment, to connect quaternary change of current list
Based on the DC bus of member, electric current, voltage and the power transience variation of DC bus are analyzed, physical model is established, devises
A kind of power swing suppressing method of light storage air-conditioning, can be improved the reliability of light storage air-conditioning, improve light storage air-conditioning mixing
Dynamic reliability under mode；Seamless switching between the polynary change of current, smooth transition may be implemented in the above embodiment of the present invention；This hair
Bright above-described embodiment is also avoided because power step fluctuation leads to light storage air-conditioning system collapse, and power grid is locally paralysed.
Fig. 7 is the schematic diagram that electrical equipment power swing of the present invention inhibits some embodiments of system.As shown in fig. 7, described
It may include DC bus-bar voltage collection device 71, DC bus current acquisition device 72 that electrical equipment power swing, which inhibits system,
Inhibit device 73 with electrical equipment power swing, in which:
DC bus-bar voltage collection device 71 for acquiring current DC bus-bar voltage with predetermined time interval, and is sent
Inhibit device 73 to electrical equipment power swing.
DC bus current acquisition device 72 for acquiring current DC bus current with predetermined time interval, and is sent
Inhibit device 73 to electrical equipment power swing.
Electrical equipment power swing inhibits device 73, for obtaining current DC bus-bar voltage with predetermined time interval and working as
Preceding DC bus current；Current power variable quantity is determined according to current DC bus-bar voltage and current DC bus current；Judgement
Whether current power variable quantity is more than or equal to predetermined power changing value；Change in current power variable quantity more than or equal to predetermined power
In the case where value, at least one in current DC bus-bar voltage and current DC bus current is adjusted, so that currently
Power variation is less than predetermined power changing value.
In some embodiments of the invention, electrical equipment power swing inhibits device 73 to can be implemented as any of the above-described
Electrical equipment power swing described in embodiment (such as Fig. 5 or Fig. 6 embodiment) inhibits device.
In some embodiments of the invention, as shown in fig. 7, the electrical equipment power swing inhibits system that can also wrap
Include power input voltage acquisition device 74, in which:
Power input voltage acquisition device 74 for acquiring current power input voltage with predetermined time interval, and is sent
Inhibit device 73 to electrical equipment power swing.
Inhibit system based on the electrical equipment power swing that the above embodiment of the present invention provides, may be implemented in power grid event
When barrier, project installation maintenance, polynary change of current switching at runtime, unit mode conversion, caused DC bus-bar voltage adjustment,
Flickering, fall, current over pulse, power step fluctuation when the polynary change of current between power steadily switch.The above embodiment of the present invention
It effective and reasonable can also stabilize the energy switching and conversion of photovoltaic side, grid side, electrical equipment side (such as air-conditioning side), energy storage side
When impact.The above embodiment of the present invention can be different according to unit operational mode, real-time tracking system energy state；According to
The working mode transition demand of commutation system, energy of reasonably releasing carry out smooth transition.
According to another aspect of the present invention, a kind of electrical equipment is provided, including the electric appliance as described in above-mentioned any embodiment
Plant capacity fluctuation inhibits device or includes the electrical equipment power swing inhibition system as described in above-mentioned any embodiment.
In some embodiments of the invention, the electrical equipment can be air-conditioning.
In some embodiments of the invention, the electrical equipment can be PV air-conditioner.
Based on the above embodiment of the present invention provide electrical equipment, may be implemented electric network fault, project installation maintenance, it is more
When first change of current switching at runtime, unit mode conversion, caused DC bus-bar voltage adjustment flickering, is fallen, electric current mistake
The power between polynary change of current when punching, power step fluctuation steadily switches.The above embodiment of the present invention can also be with effective and reasonable flat
Press down the impact when energy switching and conversion of photovoltaic side, grid side, electrical equipment side, energy storage side.The above embodiment of the present invention can
With the operational mode different according to unit, real-time tracking system energy state；According to the working mode transition demand of commutation system,
It reasonably releases energy, carries out smooth transition.
According to another aspect of the present invention, a kind of computer readable storage medium, the computer-readable storage medium are provided
Matter is stored with computer instruction, is realized when described instruction is executed by processor as (such as Fig. 2-Fig. 4 is any for above-mentioned any embodiment
Embodiment) described in electrical equipment power swing suppressing method.
Based on the computer readable storage medium that the above embodiment of the present invention provides, may be implemented in electric network fault, engineering
When installation maintenance, polynary change of current switching at runtime, unit mode conversion, caused DC bus-bar voltage adjustment, is fallen at flickering
Fall, current over pulse, power step fluctuation when the polynary change of current between power steadily switch.The above embodiment of the present invention can also have
Effect rationally stabilizes the impact when energy switching and conversion of photovoltaic side, grid side, electrical equipment side, energy storage side.The present invention is above-mentioned
Embodiment can be different according to unit operational mode, real-time tracking system energy state；According to the operating mode of commutation system
Transformation demand, energy of reasonably releasing carry out smooth transition.
It is described herein for executing that electrical equipment power swing described above inhibits device can be implemented as
General processor, programmable logic controller (PLC) (PLC), the digital signal processor (DSP), specific integrated circuit of function
(ASIC), field programmable gate array (FPGA) either other programmable logic device, discrete gate or transistor logic,
Discrete hardware components or it is any appropriately combined.
So far, the present invention is described in detail.In order to avoid covering design of the invention, it is public that this field institute is not described
The some details known.Those skilled in the art as described above, completely it can be appreciated how implementing technology disclosed herein
Scheme.
Those of ordinary skill in the art will appreciate that realizing that all or part of the steps of above-described embodiment can pass through hardware
It completes, relevant hardware can also be instructed to complete by program, the program can store in a kind of computer-readable
In storage medium, storage medium mentioned above can be read-only memory, disk or CD etc..
Description of the invention is given for the purpose of illustration and description, and is not exhaustively or will be of the invention
It is limited to disclosed form.Many modifications and variations are obvious for the ordinary skill in the art.It selects and retouches
It states embodiment and is to more preferably illustrate the principle of the present invention and practical application, and those skilled in the art is enable to manage
The solution present invention is to design various embodiments suitable for specific applications with various modifications.
Claims (14)
1. a kind of electrical equipment power swing suppressing method characterized by comprising
Current DC bus-bar voltage and current DC bus current are obtained with predetermined time interval；
Current power variable quantity is determined according to current DC bus-bar voltage and current DC bus current；
Judge whether current power variable quantity is more than or equal to predetermined power changing value；
It is to current DC bus-bar voltage and currently straight in the case where current power variable quantity is more than or equal to predetermined power changing value
At least one in stream bus current is adjusted, so that current power variable quantity is less than predetermined power changing value.
2. electrical equipment power swing suppressing method according to claim 1, which is characterized in that the current direct current of basis
Busbar voltage and current DC bus current determine that current power variable quantity includes:
Current voltage variable quantity is obtained, according to current according to current DC bus-bar voltage and the DC bus-bar voltage of preceding one acquisition
DC bus current and the DC bus current of preceding one acquisition obtain current flow variable quantity；
Judge whether current voltage variable quantity is more than or equal to predetermined voltage variable quantity, it is pre- whether current flow variable quantity is more than or equal to
Constant current variable quantity；
It is more than or equal to predetermined voltage variable quantity in current voltage variable quantity and current flow variable quantity is more than or equal to scheduled current change
In the case where change amount, current power variable quantity is determined according to current voltage variable quantity and current flow variable quantity.
3. electrical equipment power swing suppressing method according to claim 1, which is characterized in that described female to current direct current
In line voltage and current DC bus current at least one of be adjusted and include:
Outer voltage adjusting is carried out to current DC bus-bar voltage.
4. electrical equipment power swing suppressing method according to claim 1, which is characterized in that described female to current direct current
In line voltage and current DC bus current at least one of be adjusted and include:
Current inner loop adjusting is carried out to current DC bus current.
5. electrical equipment power swing suppressing method according to claim 1, which is characterized in that described female to current direct current
In line voltage and current DC bus current at least one of be adjusted and include:
Outer voltage adjusting is carried out to current DC bus-bar voltage, and current inner loop adjusting is carried out to current DC bus current.
6. the electrical equipment power swing suppressing method according to claim 3 or 5, which is characterized in that described to current straight
Stream busbar voltage carries out outer voltage adjusting
It carries out the first PID according to current DC bus-bar voltage and predetermined direct current busbar voltage to adjust, so that current power variable quantity
Less than predetermined power changing value.
7. electrical equipment power swing suppressing method according to claim 4 or 5, which is characterized in that described to current straight
Stream bus current carries out current inner loop adjusting
It carries out the 2nd PID according to current DC bus current and predetermined direct current bus current to adjust, so that current power variable quantity
Less than predetermined power changing value.
8. a kind of electrical equipment power swing inhibits device characterized by comprising
Voltage and current obtains module, for obtaining current DC bus-bar voltage and current DC bus electricity with predetermined time interval
Stream；
Power variation obtains module, for determining current power according to current DC bus-bar voltage and current DC bus current
Variable quantity；
Power variation comparison module, for judging whether current power variable quantity is more than or equal to predetermined power changing value；
Module is adjusted, is used in the case where current power variable quantity is more than or equal to predetermined power changing value, it is female to current direct current
At least one in line voltage and current DC bus current is adjusted, so that current power variable quantity becomes less than predetermined power
Change value.
9. electrical equipment power swing according to claim 8 inhibits device, which is characterized in that the electrical equipment power
Fluctuation inhibits device for executing realization such as electrical equipment power swing suppressing method of any of claims 1-7
Operation.
10. a kind of electrical equipment power swing inhibits device characterized by comprising
Memory, for storing instruction；
Processor, for executing described instruction, so that described device, which executes, realizes such as electricity of any of claims 1-7
The operation of device plant capacity fluctuation suppressing method.
11. a kind of electrical equipment power swing inhibits system characterized by comprising
Electrical equipment power swing inhibits device, for the electrical equipment power swing suppression as described in any one of claim 8-10
Device processed；
DC bus-bar voltage collection device for acquiring current DC bus-bar voltage with predetermined time interval, and is sent to electric appliance
Plant capacity fluctuation inhibits device；
DC bus current acquisition device for acquiring current DC bus current with predetermined time interval, and is sent to electric appliance
Plant capacity fluctuation inhibits device.
12. electrical equipment power swing according to claim 11 inhibits system, which is characterized in that further include:
Power input voltage acquisition device for acquiring current power input voltage with predetermined time interval, and is sent to electric appliance
Plant capacity fluctuation inhibits device.
13. a kind of electrical equipment, which is characterized in that including the electrical equipment power waves as described in any one of claim 8-10
Move the electrical equipment power swing inhibition system for inhibiting device or including as described in claim 11 or 12.
14. a kind of computer readable storage medium, which is characterized in that the computer-readable recording medium storage has computer to refer to
It enables, realizes that electrical equipment power swing of any of claims 1-7 such as inhibits when described instruction is executed by processor
Method.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810795175.4A CN108964085A (en) | 2018-07-19 | 2018-07-19 | Electrical equipment and its power swing suppressing method, device and system |
| PCT/CN2019/086893 WO2020015442A1 (en) | 2018-07-19 | 2019-05-14 | Electrical device and power fluctuation suppression method, apparatus and system therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810795175.4A CN108964085A (en) | 2018-07-19 | 2018-07-19 | Electrical equipment and its power swing suppressing method, device and system |
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| CN108964085A true CN108964085A (en) | 2018-12-07 |
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| WO (1) | WO2020015442A1 (en) |
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| WO2020015442A1 (en) * | 2018-07-19 | 2020-01-23 | 珠海格力电器股份有限公司 | Electrical device and power fluctuation suppression method, apparatus and system therefor |
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| WO2020015442A1 (en) | 2020-01-23 |
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Application publication date: 20181207 |