CN109936120A - Inverter management method and system - Google Patents
Inverter management method and system Download PDFInfo
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- CN109936120A CN109936120A CN201910104452.7A CN201910104452A CN109936120A CN 109936120 A CN109936120 A CN 109936120A CN 201910104452 A CN201910104452 A CN 201910104452A CN 109936120 A CN109936120 A CN 109936120A
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Abstract
This application provides a kind of inverter management method and systems.When the inverter management method includes: that the first output electric current for determining inverter is greater than setting electric current threshold values, interrupt output power, to reduce the output electric current of the inverter；Determine the inverter output current reduction to equal than or when being less than the setting electric current threshold values, restore output power, and reduce the output voltage of the inverter；So circulation, the output electric current for repeatedly determining the inverter is greater than setting electric current threshold values, and calculates cycle-index, and judges whether the cycle-index is greater than setting number threshold values；If judging, the cycle-index is greater than the setting number threshold values, output loading overload.In the application, whether setting electric current threshold values is greater than according to the overcurrent number that the output electric current of inverter is greater than setting electric current threshold values, can judge whether to overload.
Description
Technical field
This application involves inverter technology field more particularly to a kind of inverter management methods and system.
Background technique
Inverter is used to direct current energy circulation becoming alternating current.The shock resistance load capacity of inverter is to judge inverter
An important indicator, it is required that not causing the damage of equipment under the impact condition of load overload.Meanwhile output short circuit protection
Reliability be also inverter an important indicator, it is required that not causing the damage of equipment under the impact condition of load short circuits
It is bad.
In a kind of existing hardware approach, inverter samples output circuit using sample circuit, when electric current reaches
When the maximum protection value of setting, switch member directly closes load output.However, in order to improve the shock resistance load capacity of inverter
It needs to amplify the maximum protection value of the setting, causes the electric current for flowing through inverter switching device part accordingly larger, this will lead to switch
Part can be had damage risk by the impact of larger current, and then increase hardware cost.
In a kind of existing software approach, inverter is additionally provided with bicyclic PI control module, double for realizing voltage and current
Closed loop control method.This method is higher to the parameter request of bicyclic PI control module, needs to carry out for different types of load
Corresponding parameter matching.In different loads, need to match different parameters to maintain the stabilization of system.
In addition, this method is control constant current output when encountering under greater impact loading condition, output voltage accordingly drops rapidly
It is low, it may cause equipment that can not work lower than the minimum operating voltage of electrical equipment being used for.In the case of encountering output short-circuit,
This method is also constant current output.Thus, this method, which will lead to, can not effectively distinguish large impact load and two kinds of differences of output short-circuit
Situation can not effectively judge true output short-circuit feelings.
Summary of the invention
This application provides a kind of inverter management method and systems, and setting electricity can be greater than according to the output electric current of inverter
Whether the overcurrent number of stream threshold values is greater than setting electric current threshold values, judges whether to overload.
In a first aspect, this application provides a kind of inverter management methods.The inverter management method includes:
When determining the output electric current of inverter for the first time greater than setting electric current threshold values, interrupt output power, described in reducing
The output electric current of inverter；
Determine the inverter output current reduction to equal than or be less than the setting electric current threshold values when, restore output
Power, and reduce the output voltage of the inverter；
So circulation, the output electric current for repeatedly determining the inverter is greater than setting electric current threshold values, and calculates and follow
Ring number, and judge whether the cycle-index is greater than setting number threshold values；
If judging, the cycle-index is greater than the setting number threshold values, output loading overload.
Optionally, the setting electric current threshold values is configured to be arranged with being conditioned；And/or
The setting number threshold values is configured to be arranged with being conditioned.
Optionally, the inverter includes the control module for output duty cycle；
When determining the output electric current of inverter every time greater than setting electric current threshold values, accounting for for the control module output is obtained
Empty ratio, and reduce the occupancy ratio of the control module；
Determine the inverter output current reduction to equal than or be less than the setting electric current threshold values when, subtract described
Small occupancy ratio is applied to load, to reduce output voltage.
Optionally, the control module is the PI control module for exporting SPWM duty ratio；
When determining the output electric current of inverter every time greater than setting electric current threshold values, the PI control module output is obtained
Duty ratio, and by the occupancy of the PI control module than reducing setting step-length.
Optionally, if judging, the cycle-index is less than the setting number threshold values and what the control module exported accounts for
Sky is than being equal to or less than setting duty ratio threshold values, output loading short circuit.
Optionally, when determining the output electric current of the inverter for the first time greater than setting electric current threshold values, setting initial value is
Zero metering parameter；
When determining the output electric current of the inverter every time later and being greater than setting electric current threshold values for the first time, the metering parameter
Numerical value increases ground setting, to obtain the cycle-index.
Optionally, exporting in the setting time after electric current is greater than setting electric current threshold values for inverter is determined for the first time certainly, if
Non- output loading overload and short circuit, remove the cycle-index.
Optionally, comparison module obtains the output electric current of the inverter, and judges that the output electric current of the inverter is
It is no to be greater than setting electric current threshold values；
Wherein the comparison module includes:
Sample circuit, the sample circuit are configured as obtaining the output electric current of the inverter；
Comparator, the comparator is provided with setting electric current threshold values, and is configured as: judging that the sample circuit is got
Output electric current whether be greater than setting electric current threshold values.
Second aspect, this application provides a kind of inverter management systems.The inverter management system includes:
Inverter；
Comparison module, the comparison module is configured as obtaining the output electric current of the inverter, and judges the inversion
Whether the output electric current of device is greater than setting electric current threshold values.
Processing module, the processing module are configured as:
The interrupt signal that the inverter output current is greater than setting electric current threshold values is determined according to the comparison module, in
Disconnected output power, to reduce the output electric current of the inverter；
The inverter output current is determined equal to or less than the setting electric current threshold values according to the comparison module
Restore signal, restores output power, and reduce the output voltage of the inverter；
The cycle-index for calculating the interrupt signal, judges whether the cycle-index is greater than setting number threshold values；
If judge that the cycle-index is greater than the setting number threshold values, output loading overload.
Optionally, the setting electric current threshold values is configured to be arranged with being conditioned；And/or
The setting number threshold values is configured to be arranged with being conditioned.
Optionally, further include control module for output duty cycle；
The processing module is configurable for:
According to the interrupt signal, the duty ratio of the control module output is obtained, and reduces accounting for for the control module
With than；
According to the recovery signal, the reduced occupancy ratio is applied to load, to reduce output voltage.
Optionally, the control module is the PI control module for exporting SPWM duty ratio；
The processing module is configured as: according to the interrupt signal, the duty ratio of the PI control module output is obtained,
By the occupancy of the PI control module than reducing by a step-length.
Optionally, the processing module is configured as: determine the cycle-index less than the setting number threshold values and
When the duty ratio of the control module output is equal to or less than setting duty ratio threshold values, output loading short circuit.
Optionally, further include metering module, be configured as:
When determining the output electric current of inverter for the first time greater than setting electric current threshold values, the metering that setting initial value is zero is joined
Number；
When determining the output electric current of inverter each time and being greater than setting electric current threshold values for the first time, the metering parameter values increase
A ground is added to be arranged, to obtain the cycle-index.
Optionally, the control module is configured as: being greater than setting electric current from the output electric current for determining inverter for the first time
In setting time after threshold values, if not carrying out overload protection and short-circuit protection, the cycle-index is at least removed.
Optionally, the comparison module includes:
Sample circuit, the sample circuit are configured as obtaining the output electric current of the inverter；
Comparator, the comparator is provided with setting electric current threshold values, and is configured as: judging that the sample circuit is got
Output electric current whether be greater than setting electric current threshold values, and export interrupt signal or restore signal.
It optionally, further include the load for accessing the inverter.
In the application, whether setting electricity is greater than according to the overcurrent number that the output electric current of inverter is greater than setting electric current threshold values
Threshold values is flowed, can determine whether to overload, be avoided that the damage of inverter.
The overcurrent number and duty ratio for being less than setting electric current threshold values in conjunction with overcurrent number are no more than setting duty ratio threshold values
Judgement, exportable load short circuits are avoided that the damage of inverter.Can determine whether inverter be large impact load or output short-circuit,
Accurate management can be achieved.
Setting number threshold values can be set according to the receiving load capacity of inverter, and can set inverter allows most
Heavy load impact range.Setting electric current threshold values can smaller setting, the output electric current of inverter do not exceed setting electric current threshold values, keeps away
Exempt from the electrical parts such as determining device causes to damage due to flowing through high current.
Inverter management method and system design are simple.It sets number threshold values and setting electric current threshold values can be according to different type
Load carry out parameter matching adjust, flexible operation, improve the performance of inverter.
It should be understood that the above general description and the following detailed description are merely exemplary, this can not be limited
Application.
Detailed description of the invention
Technical solution in ord to more clearly illustrate embodiments of the present application, below will be to needed in the embodiment attached
Figure is briefly described, it should be apparent that, the drawings in the following description are only some examples of the present application, for this field
For those of ordinary skill, without creative efforts, it can also be obtained according to these attached drawings other attached drawings.
Fig. 1 is the inverter management method flow chart that a kind of embodiment of the application provides；
Fig. 2 is the inverter management method flow chart that a kind of embodiment of the application provides；
Fig. 3 is the inverter management method flow chart that a kind of embodiment of the application provides；
Fig. 4 is the inverter management system schematic diagram that a kind of embodiment of the application provides.
Description of symbols:
10- inverter；
20- processing module；
30- comparison module；
40- control module；
80- load.
Specific embodiment
In order to better understand the technical solution of the application, the embodiment of the present application is retouched in detail with reference to the accompanying drawing
It states.
It will be appreciated that described embodiments are only a part of embodiments of the present application, instead of all the embodiments.Base
Embodiment in the application, it is obtained by those of ordinary skill in the art without making creative efforts it is all its
Its embodiment, shall fall in the protection scope of this application.
The term used in the embodiment of the present application is only to be not intended to be limiting merely for for the purpose of describing particular embodiments
The application.In the embodiment of the present application and the "an" of singular used in the attached claims, " described " and "the"
It is also intended to including most forms, unless the context clearly indicates other meaning.
It should be appreciated that term "and/or" used herein is only a kind of incidence relation for describing affiliated partner, indicate
There may be three kinds of relationships, for example, A and/or B, can indicate: individualism A, exist simultaneously A and B, individualism B these three
Situation.In addition, character "/" herein, typicallys represent the relationship that forward-backward correlation object is a kind of "or".
It should be appreciated that unless otherwise indicated, the meaning of " plurality " is two or more；Term " first ", " second ",
" third " etc. is used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance and sequence.
Depending on context, word as used in this " if " can be construed to " ... when " or " when ...
When " or " in response to determination " or " in response to detection ".Similarly, depend on context, phrase " if it is determined that " or " if detection
(condition or event of statement) " can be construed to " when determining " or " in response to determination " or " when the detection (condition of statement
Or event) when " or " in response to detection (condition or event of statement) ".
According to one embodiment of the application, a kind of inverter management method is provided.Fig. 1 shows a kind of reality of the application
Apply the inverter management method of example.
Referring to Fig. 1, this method at least includes the following steps:
When determining the output electric current of inverter for the first time greater than setting electric current threshold values, interrupt output power, to reduce inversion
The output electric current of device.
In the step, when the output electric current for determining inverter for the first time is greater than setting electric current threshold values, interrupt output power,
The output electric current of inverter decreases at this time.Before interrupt output power, inverter output voltage is applied in load.
Determine inverter output current reduction to equal than or be less than setting electric current threshold values when, restore output power, and
Reduce the output voltage of inverter.
In the step, when the output current reduction for determining inverter to equal than be less than setting electric current threshold values when, it is extensive
Multiple output power.Meanwhile the output voltage of inverter is reduced, it generates a new relatively low output voltage and is applied in load.
After restoring output power and reducing the output voltage of inverter, the output of inverter can repeatedly be determined
Electric current is greater than setting electric current threshold values, so cyclically carries out aforementioned step.In the process, cycle-index is calculated, and is sentenced
Whether disconnected cycle-index is greater than setting number threshold values.
If determining cycle-index is greater than setting number threshold values, output loading overload.It is overloaded according to the load of the output,
Inverter can enter overload protection.
In the step, setting number threshold values can be set according to the receiving load capacity of inverter, represent inverter
The maximum load impact range of permission reflects maximum impact power designed by inverter.It is set if determining cycle-index and being greater than
Determine number threshold values, illustrate: after the impact for carrying out certain number, the output voltage of inverter accordingly reduces inverter, but
It is that over-current phenomenon avoidance still occurs, that is, can determine whether that real impact load at this time is greater than maximum impact power designed by inverter,
Output overloading is protected at this time.
If determining cycle-index is equal to or less than setting number threshold values, illustrate that inverter reaches later by load shock
It is not in over-current signal to steady-working state, inverter passes through load shock, and not output loading overload will not be damaged
Inverter causes inverter to restart.
In the present embodiment, which can be conditioned setting, be compared for the output electric current with inverter.Electric current
Threshold values can be set to smaller value.
Setting number threshold values can be conditioned setting, for being compared with the cycle-index being calculated.
To judge whether the output electric current of inverter is greater than setting electric current threshold values, the present embodiment is also provided with comparison module.
Comparison module is used to obtain the output electric current of inverter, and judges whether the output electric current of inverter is greater than setting electric current threshold values.
According to the judgement of comparison module, corresponding interrupt output power or recovery output power.For example, comparison module may include sampling electricity
Road and comparator etc..
For the output voltage that can reduce inverter when restoring output power, in a kind of optional example, inverter includes using
In the control module of output duty cycle.
When determining the output electric current of inverter every time greater than setting electric current threshold values, the duty of control module output is obtained
Than, and reduce the occupancy ratio of control module.
Determine inverter output current reduction to equal than or be less than setting electric current threshold values when, by above-mentioned reduced occupancy
Than being applied to load, to reduce output voltage.
Further, control module is the PI control module (ratio for exporting SPWM (sinusoidal pulse width modulation) duty ratio
Integral control module), PI control module is used for proportion adjustment and integral adjustment.
When determining the output electric current of inverter every time greater than setting electric current threshold values, the duty of control module output is obtained
Than, and the duty ratio is reduced into setting step-length (such as step-length etc.), obtain a new duty ratio.Determine inverter
Export current reduction to equal than or be less than setting electric current threshold values when, by the reduction setting step-length occupancy ratio be applied to load, with
Reduce the output voltage of inverter.
Further, it is set if judging that cycle-index is less than less than the duty ratio of setting number threshold values and control module output
Determine duty ratio threshold values, then output loading short circuit.According to the load short circuits of the output, inverter can enter short-circuit protection.
The actual duty cycle that the setting duty ratio threshold values is used to export with control module is compared.When judging cycle-index
When actual duty cycle less than setting number threshold values and control module output is less than setting duty ratio threshold values, illustrate: in inverter
In the case of output voltage very little, load still generates over-current signal, indicates load short circuits.Thus, in repetitive cycling process above-mentioned
In, when cycle-index is less than setting number threshold values, if the duty ratio for determining control module output is less than setting duty ratio valve
Value, then output loading short circuit.
To obtain cycle-index, in a kind of optional example, the output electric current for determining inverter for the first time is greater than setting electricity
When flowing threshold values, the metering parameter that initial value is zero is set.The output electric current for determining inverter every time later is greater than setting for the first time
When current threshold, metering parameter values increase ground setting, to obtain cycle-index.
Referring to Fig. 2, being greater than setting from the output electric current for determining inverter for the first time in order to avoid influencing subsequent judgement
In setting time after current threshold, if non-output loading overload and load short circuits, the cycle-index for calculating and obtaining can be removed.Tool
Body, when determining the output electric current of inverter for the first time greater than setting electric current threshold values, it can produce overcurrent flag bit.Such as it crosses and fails to be sold at auction
Will position can be labeled as 1.After setting time, if the non-output loading overload of inverter and short circuit, remove accumulative circulation time
Several and overcurrent flag bit.For example, cycle-index can be reset to zero, overcurrent flag bit is reset to zero.
In a kind of specific embodiment, referring to Fig. 3, the output electric current for determining inverter for the first time is greater than setting electric current valve
When setting time after value, generate be labeled as 1 overcurrent flag bit.Interrupt output power, to reduce the output electric current of inverter.
Determine inverter output current reduction to equal than or be less than setting electric current threshold values when, restore output power, and
It will occupy than reducing setting step-length to reduce the output voltage of inverter.It so recycles several times, and calculates cycle-index.
During one cycle, judge whether cycle-index is greater than setting number threshold values.If being judged as YES, by circulation time
Number is reset, output loading overload.
If being judged as NO, the duty ratio of control module output is reduced into a step-length, then judge accounting for for control module output
Whether sky is than being less than setting duty ratio threshold values.If this is judged as YES, output loading short circuit.
It should be noted that the inverter management method of the present embodiment can be applied to off-network inverter or other inverters
On.
Based on the same inventive concept, according to another embodiment of the application, a kind of inverter management system is additionally provided.Figure
4 show the inverter management system schematic diagram that a kind of embodiment of the application provides.
Referring to Fig. 4, the inverter management system includes inverter 10, comparison module 30 and processing module 20.Inverter
10 can access load 80.Wherein comparison module 30 is used to obtain the output electric current of inverter 10, and judges the output of inverter 10
Whether electric current is greater than setting electric current threshold values.
Wherein processing module 20 is used for:
Inverter 10 is determined according to comparison module 30 and exports the interrupt signal that electric current is greater than setting electric current threshold values, is interrupted defeated
Power out, to reduce the output electric current of inverter 10；
Inverter 10, which is determined, according to comparison module 30 exports the recovery signal that electric current is equal to or less than setting electric current threshold values,
Restore output power, and reduces the output voltage of inverter 10；
The cycle-index for calculating interrupt signal, judges whether cycle-index is greater than setting number threshold values；
If judge that cycle-index is greater than setting number threshold values, output loading overload.
Processing module 20 in the present embodiment may be configured as MCU (micro-control unit).
In the present embodiment, which can be conditioned setting, be compared for the output electric current with inverter 10.Electricity
Stream threshold values can be set to smaller value.
Setting number threshold values can be conditioned setting, for being compared with the cycle-index being calculated.
To judge whether the output electric current of inverter 10 is greater than setting electric current threshold values, in a kind of optional example, the inverter
Management system further includes comparison module 30.Comparison module 30 is used to obtain the output electric current of inverter 10, and judges inverter 10
Output electric current whether be greater than setting electric current threshold values.According to the judgement information of comparison module 30, management module interrupt output power
Or restore output power.
Comparison module 30 may include sample circuit and comparator.Sample circuit is used to obtain the output electric current of inverter 10.
Sample circuit is connect with comparator.Comparator is provided with setting electric current threshold values, the inverter got for judging sample circuit
Whether 10 output electric currents are greater than setting electric current threshold values.
Further, comparator may include triode or metal-oxide-semiconductor (metal oxide semiconductor, metal-
Oxide-semiconductor field effect transistor) etc..Comparator exports whether electric current is greater than setting electric current threshold values according to inverter 10
Judging result, respectively to determining device export interrupt signal or restore information.For example, when to determine inverter 10 defeated for determining device
When electric current is greater than setting electric current threshold values out, the interrupt signal of a failing edge is exported to processing module 20；When determining device determines
When inverter 10 exports electric current and is equal to or less than setting electric current threshold values, the recovery signal an of rising edge is exported to processing module
20。
Setting electric current threshold values can smaller setting, the output electric current of inverter 10 do not exceed setting electric current threshold values, avoids sentencing
The devices such as disconnected device cause to damage due to flowing through high current.
For the output voltage that can reduce inverter 10 when restoring output power, in a kind of optional example, the inverter pipe
Reason system further includes the control module 40 for output duty cycle.According to the occupancy that control module 40 exports, inverter 10 applies
In 80 corresponding output voltages of load.
Processing module 20 is used for: according to the interrupt signal of comparison module 30, the duty ratio that control module 40 exports is obtained, and
Reduce the occupancy ratio of control module 40；According to the recovery signal of comparison module 30, the occupancy ratio of the reduction is applied to load 80,
To reduce output voltage.
Further, control module 40 is for exporting the PI control module of SPWM (sinusoidal pulse width modulation) duty ratio (ratio
Example integral control module), PI control module 40 is used for proportion adjustment and integral adjustment.
When determining the output electric current of inverter 10 every time greater than setting electric current threshold values, accounting for for the output of control module 40 is obtained
Empty ratio, and the duty ratio is reduced into setting step-length (such as step-length etc.), obtain a new duty ratio.Determine inverter
10 output current reduction to equal than or be less than setting electric current threshold values when, by the reduction setting step-length occupancy ratio be applied to load
80, to reduce by 10 output voltage of inverter to generate new 10 output voltage of inverter.
Further, processing module 20 is configured as: if judging, cycle-index is less than setting number threshold values and control module
The duty ratio of 40 outputs is less than setting duty ratio threshold values, then output loading short circuit.According to the load short circuits of the output, inverter 10
Short-circuit protection can be entered.
The actual duty cycle that the setting duty ratio threshold values is used to export with control module 40 is compared.When judgement circulation time
When the actual duty cycle that number is less than setting number threshold values and control module 40 exports is less than setting duty ratio threshold values, illustrate: inverse
Become in the case of 10 output voltage very little of device, load 80 still generates over-current signal, indicates 80 short circuit of load.Thus, above-mentioned heavy
In multiple cyclic process, when cycle-index is less than setting number threshold values, if the duty ratio for determining the output of control module 40 is less than
Duty ratio threshold values is set, then output loading short circuit.
To obtain cycle-index, in a kind of optional example, which further includes metering module.Metering mould
Block is used for: when the output electric current for determining inverter 10 for the first time is greater than setting electric current threshold values, the metering that initial value is zero is arranged
Parameter；When determining the output electric current of inverter 10 each time and being greater than setting electric current threshold values for the first time, metering parameter values increase by one
Ground setting, to obtain cycle-index.For example, metering module can be integrally disposed in processing module 20.
In order to avoid influencing subsequent judgement, processing module 20 is used for: from the output electric current for determining inverter 10 for the first time
Greater than in the setting time after setting electric current threshold values, if not carrying out overload protection and short-circuit protection, cumulative calculation is at least removed
Cycle-index.Accordingly, inverter management system further includes timing module.Such as timing module cocoa is integrally disposed in processing
In module 20.According to the clocking information of timing module, metering module is reset.
From determine for the first time inverter 10 output electric current be greater than setting electric current threshold values after setting time in, if not exporting
Load overload and load short circuits, can remove the cycle-index of metering module calculating.Specifically, the defeated of inverter 10 is determined for the first time
When electric current is greater than setting electric current threshold values out, processing module 20 can produce overcurrent flag bit.Such as overcurrent flag bit can be labeled as 1.
After setting time, if inverter 10 does not carry out overload protection and short-circuit protection, processing module 20, which can be removed, calculates acquisition
Cycle-index and overcurrent flag bit.For example, cycle-index can be reset to zero, overcurrent flag bit is reset to zero.
It should be noted that off-network inverter or other inverters can be used in the inverter of the present embodiment.
In the application, whether setting is greater than according to the overcurrent number that the output electric current of inverter 10 is greater than setting electric current threshold values
Current threshold can determine whether to overload, and be avoided that the damage of inverter 10.
The overcurrent number and duty ratio for being less than setting electric current threshold values in conjunction with overcurrent number are no more than setting duty ratio threshold values
Judgement, exportable load short circuits are avoided that the damage of inverter 10.It can determine whether that inverter 10 is large impact load or exports short
Road is, it can be achieved that accurate management.
Setting number threshold values can be set according to the receiving load capacity of inverter 10, can set the permission of inverter 10
Maximum load impact range.Setting electric current threshold values can smaller setting, the output electric current of inverter 10 do not exceed setting electric current
Threshold values avoids the electrical parts such as determining device from causing to damage due to flowing through high current.
Inverter management method and system design are simple.It sets number threshold values and setting electric current threshold values can be according to different type
Load carry out parameter matching adjust, flexible operation, improve the performance of inverter 10.
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, for example, multiple units or group
Part 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, device or unit it is indirect
Coupling or communication connection 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, the functional units in various embodiments of the present invention may be integrated into 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 hardware adds SFU software functional unit.
The foregoing is merely the preferred embodiments of the application, not to limit the application, all essences in the application
Within mind and principle, any modification, equivalent substitution, improvement and etc. done be should be included within the scope of the application protection.
Claims (16)
1. a kind of inverter management method characterized by comprising
When determining the output electric current of inverter for the first time greater than setting electric current threshold values, interrupt output power, to reduce the inversion
The output electric current of device；
Determine the inverter output current reduction to equal than or be less than the setting electric current threshold values when, restore output work
Rate, and reduce the output voltage of the inverter；
So circulation, the output electric current for repeatedly determining the inverter is greater than setting electric current threshold values, and calculates circulation time
Number, and judge whether the cycle-index is greater than setting number threshold values；
If judging, the cycle-index is greater than the setting number threshold values, output loading overload.
2. inverter management method according to claim 1, it is characterised in that:
The setting electric current threshold values is configured to be arranged with being conditioned；And/or
The setting number threshold values is configured to be arranged with being conditioned.
3. inverter management method according to claim 1, it is characterised in that:
The inverter includes the control module for output duty cycle；
When determining the output electric current of inverter every time greater than setting electric current threshold values, the duty of the control module output is obtained
Than, and reduce the occupancy ratio of the control module；
Determine the inverter output current reduction to equal than or be less than the setting electric current threshold values when, by the reduction
It occupies ratio and is applied to load, to reduce output voltage.
4. inverter management method according to claim 3, it is characterised in that:
The control module is the PI control module for exporting SPWM duty ratio；
When determining the output electric current of inverter every time greater than setting electric current threshold values, the duty of the PI control module output is obtained
Than, and by the occupancy of the PI control module than reducing setting step-length.
5. inverter management method according to claim 3, it is characterised in that:
If judging, the cycle-index is less than the setting number threshold values and the duty ratio of control module output is less than setting
Duty ratio threshold values, output loading short circuit.
6. inverter management method according to claim 1, it is characterised in that:
When determining the output electric current of the inverter for the first time greater than setting electric current threshold values, the metering that setting initial value is zero is joined
Number；
When determining the output electric current of the inverter every time later and being greater than setting electric current threshold values for the first time, the metering parameter values
Increase ground setting, to obtain the cycle-index.
7. inverter management method according to claim 1, it is characterised in that:
From determine for the first time inverter output electric current be greater than setting electric current threshold values after setting time in, if non-output loading
It carries and short-circuit, removes the cycle-index.
8. inverter management method according to claim 1, it is characterised in that:
Comparison module obtains the output electric current of the inverter, and judges whether the output electric current of the inverter is greater than setting electricity
Flow threshold values；
Wherein the comparison module includes:
Sample circuit, the sample circuit are configured as obtaining the output electric current of the inverter；
Comparator, the comparator is provided with setting electric current threshold values, and is configured as: judging that the sample circuit is got defeated
Whether electric current is greater than setting electric current threshold values out.
9. a kind of inverter management system characterized by comprising
Inverter；
Comparison module, the comparison module is configured as obtaining the output electric current of the inverter, and judges the inverter
Whether output electric current is greater than setting electric current threshold values.
Processing module, the processing module are configured as:
The interrupt signal that the inverter output current is greater than setting electric current threshold values is determined according to the comparison module, is interrupted defeated
Power out, to reduce the output electric current of the inverter；
The recovery that the inverter output current is equal to or less than the setting electric current threshold values is determined according to the comparison module
Signal restores output power, and reduces the output voltage of the inverter；
The cycle-index for calculating the interrupt signal, judges whether the cycle-index is greater than setting number threshold values；
If judge that the cycle-index is greater than the setting number threshold values, output loading overload.
10. inverter management system according to claim 9, it is characterised in that:
The setting electric current threshold values is configured to be arranged with being conditioned；And/or
The setting number threshold values is configured to be arranged with being conditioned.
11. inverter management system according to claim 9, which is characterized in that further include the control for output duty cycle
Molding block；
The processing module is configurable for:
According to the interrupt signal, the duty ratio of the control module output is obtained, and reduces the occupancy ratio of the control module；
According to the recovery signal, the reduced occupancy ratio is applied to load, to reduce output voltage.
12. inverter management system according to claim 11, it is characterised in that:
The control module is the PI control module for exporting SPWM duty ratio；
The processing module is configured as: according to the interrupt signal, the duty ratio of the PI control module output is obtained, by institute
The occupancy of PI control module is stated than reducing by a step-length.
13. inverter management system according to claim 11, which is characterized in that it is characterized by:
The processing module is configured as: determining the cycle-index less than the setting number threshold values and the control mould
When the duty ratio of block output is less than setting duty ratio threshold values, output loading short circuit.
14. inverter management system according to claim 9, it is characterised in that:
The control module is configured as: from the output electric current of inverter is determined for the first time greater than the setting after setting electric current threshold values
In time, if not carrying out overload protection and short-circuit protection, the cycle-index is at least removed.
15. inverter management system according to claim 9, which is characterized in that the comparison module includes:
Sample circuit, the sample circuit are configured as obtaining the output electric current of the inverter；
Comparator, the comparator is provided with setting electric current threshold values, and is configured as: judging that the sample circuit is got defeated
Whether electric current is greater than setting electric current threshold values out, and exports interrupt signal or restore signal.
16. inverter management system according to claim 9, which is characterized in that further include accessing bearing for the inverter
It carries.
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| CN110635534A (en) * | 2019-10-10 | 2019-12-31 | 国网江苏综合能源服务有限公司 | Self-diagnosis off-grid current limiting control method for mobile electrochemical energy storage system |
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| CN109936120B (en) | 2021-04-06 |
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