CN107040154B - Battery inversion system and its Current limited Control method with Current limited Control function - Google Patents
Battery inversion system and its Current limited Control method with Current limited Control function Download PDFInfo
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- CN107040154B CN107040154B CN201710334742.1A CN201710334742A CN107040154B CN 107040154 B CN107040154 B CN 107040154B CN 201710334742 A CN201710334742 A CN 201710334742A CN 107040154 B CN107040154 B CN 107040154B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
Abstract
The present invention relates to a kind of Current limited Control methods of battery inversion system, battery inversion system includes battery and inverter module, this method includes the transient current for sampling inverter module output, if the transient current is greater than current limit threshold, it then controls battery inversion system and enters limited current state, reduce the output voltage of inverter module according to the error between transient current and current limit threshold, to reduce transient current, if transient current is decreased to less than equal to current limit threshold, and transient current is stable below current limit threshold, then increase the output voltage of inverter module to the demand voltage of battery inversion system driving equipment；Then increase the demand voltage of its output voltage to electrical equipment by its transient current control in current limit threshold according to the output voltage that the error between the transient current and current limit threshold of inverter module output reduces inverter module；Battery inversion system output electric current may be implemented accurately to control in real time, it is simple and reliable, ensure the safety of electrical equipment.
Description
Technical field
The present invention relates to current control field, more particularly to Current limited Control function battery inversion system and its
Current limited Control method.
Background technique
As automobile industry continues to develop, the application of Vehicular accumulator cell is also more and more, needs the direct current of battery
It is converted into driving mobile unit operation after 50Hz/220V alternating current, in order to guarantee the safety of vehicle-mounted electrical equipment, need to vehicle
The output electric current for carrying battery inversion system carries out overcurrent limitation, prevents brief energization electric current from crossing senior general's equipment burnout.Currently, defeated
Current limited Control mainly has following methods out:
Scheme one: being detected using hardware circuit, exports electric current by sampling circuit samples, by comparator and relay,
It cuts off output equipment or reduces battery group number, realize current-limiting protection.
Scheme two: by ice storing time module, each period pair since this electric discharge work of real-time detection battery
The discharge current parameter answered, calculates real-time discharge capacity, controls output electric current by DC-DC converter.
In above scheme, scheme one needs to increase special hardware circuit to control output electric current, increase circuit cost and
Complexity in circuits, while increasing circuit board PCB volume and then influencing complete machine structure and volume.Scheme two needs real-time detection
Discharge capacity of the cell is calculated, calculate complicated and requires calculating accurate, cell output current difficult to realize accurately controls in real time.
Summary of the invention
Based on this, it is necessary to provide a kind of with the battery inversion system of Current limited Control function and its Current limited Control side
Method may be implemented battery inversion system output electric current and accurately control in real time, simple and reliable, ensure the peace of electrical equipment
Entirely.
On the one hand, the present invention proposes a kind of Current limited Control method of battery inversion system, the battery inversion system
Direct current including battery and for exporting the battery is converted to the inverter module of alternating current, which comprises
Sample the transient current of the inverter module output；
Compare the size of the transient current and current limit threshold, if the transient current is greater than the current limit threshold, controls
It makes the battery inversion system and enters limited current state, according to the error reduction between the transient current and current limit threshold
The output voltage of inverter module, to reduce the transient current；
If the transient current is decreased to less than equal to the current limit threshold, and the transient current is stable in the current limliting
Threshold value is hereinafter, then increase the output voltage of the inverter module to the demand voltage of the battery inversion system driving equipment.
The Current limited Control method of above-mentioned battery inversion system, battery inversion system include battery and for will be described
The direct current of battery output is converted to the inverter module of alternating current, and this method includes sample the inverter module output instantaneous
Electric current, the size of the transient current and current limit threshold control institute if the transient current is greater than the current limit threshold
It states battery inversion system and enters limited current state, the inversion is reduced according to the error between the transient current and current limit threshold
The output voltage of module, to reduce the transient current, if the transient current is decreased to less than equal to the current limit threshold, and institute
State transient current it is stable in the current limit threshold hereinafter, the output voltage for then increasing the inverter module is inverse to the battery
Become the demand voltage of system drive equipment；It is reduced according to the error between the transient current and current limit threshold of inverter module output inverse
Then the output voltage for becoming module increases its output voltage to electrical equipment by its transient current control in current limit threshold
Demand voltage；Battery inversion system output electric current may be implemented accurately to control in real time, it is simple and reliable, ensure electrical equipment
Safety.
In one of the embodiments, after the step of transient current of the sampling inverter module output, also wrap
It includes:
The transient current is filtered to obtain instantaneous filtered circuit corresponding with the transient current；
When the instantaneous filtered circuit often reaches primary current peak value, the number of current peak is added one；
The size of the transient current and current limit threshold, if the transient current is greater than the current limit threshold,
It then controls the battery inversion system and enters limited current state, reduced according to the error between the transient current and current limit threshold
The step of output voltage of the inverter module specifically:
Compare the size of the instantaneous filtered circuit and current limit threshold, if the instantaneous filtered circuit is greater than the current limiting threshold
Value, then control the battery inversion system and enter limited current state, according between the instantaneous filtered circuit and current limit threshold
Error reduces the output voltage of the inverter module；
After the step of battery inversion system enters limited current state, further includes:
The number of the current peak is reset；
The transient current it is stable the current limit threshold in detail below are as follows:
The number of the current peak reaches amount threshold.
After the step of battery inversion system enters limited current state in one of the embodiments, further includes:
Current limliting mark is set；
If the battery inversion system is in limited current state, and the transient current it is stable the current limit threshold with
Under step after, further includes:
By the current limliting flag clear.
The error according between the instantaneous filtered circuit and current limit threshold reduces institute in one of the embodiments,
The step of stating the output voltage of inverter module specifically:
The inverter module is reduced by pi regulator according to the error between the instantaneous filtered circuit and current limit threshold
Output given voltage；
The modulation ratio of the inverter module is calculated according to the output given voltage；
The inverter module is driven according to the modulation ratio.
The output voltage for increasing the inverter module is to the battery inversion system in one of the embodiments,
The step of demand voltage of driving equipment specifically:
Increase the output given voltage of the inverter module by presetting acceleration curve；
Amplitude limiting processing is carried out to the output given voltage after increase, the demand voltage is obtained, according to the demand voltage
Calculate the modulation ratio of the inverter module；
The inverter module is driven according to the modulation ratio；
The default acceleration curve meets:
M_VF=M_VF0+ △ T*Umax/AccT；
Wherein, M_VF0 is the current output given voltage of the inverter module, and Umax is that the maximum of the inverter module is defeated
Voltage out, AccT are that the current output given voltage is increased to the time that the maximum output voltage needs, and M_VF is institute
State the output given voltage that current output given voltage obtains after the growth of default fixed duration △ T.
On the other hand, the present invention proposes a kind of battery inversion system with Current limited Control function, including battery, inverse
Become module, current detection module and main control module, the inverter module is for being converted to the direct current that the battery exports
Alternating current, the current detection module are used to sample the transient current of the inverter module output, store on the main control module
There is the Current limited Control program of the battery inversion system, the main control module is realized following when executing the Current limited Control program
Step:
Compare the size of the transient current and current limit threshold, if the transient current is greater than the current limit threshold, controls
It makes the battery inversion system and enters limited current state, according to the error reduction between the transient current and current limit threshold
The output voltage of inverter module, to reduce the transient current；
If the transient current is decreased to less than equal to the current limit threshold, and the transient current is stable in the current limliting
Threshold value is hereinafter, then increase the output voltage of the inverter module to the demand voltage of the battery inversion system driving equipment.
The main control module realizes the size of the transient current and current limit threshold in one of the embodiments,
Before step, step is also realized:
The transient current is filtered to obtain instantaneous filtered circuit corresponding with the transient current；
When the instantaneous filtered circuit often reaches primary current peak value, the number of current peak is added one；
The size of the transient current and current limit threshold, if the transient current is greater than the current limit threshold,
It then controls the battery inversion system and enters limited current state, reduced according to the error between the transient current and current limit threshold
The step of output voltage of the inverter module specifically:
Compare the size of the instantaneous filtered circuit and current limit threshold, if the instantaneous filtered circuit is greater than the current limiting threshold
Value, then control the battery inversion system and enter limited current state, according between the instantaneous filtered circuit and current limit threshold
Error reduces the output voltage of the inverter module；
After the main control module realizes the step of battery inversion system enters limited current state, step is also realized:
The number of the current peak is reset；
The transient current it is stable the current limit threshold in detail below are as follows:
The number of the current peak reaches amount threshold.
The main control module realizes that the battery inversion system enters the step of limited current state in one of the embodiments,
After rapid, step is also realized:
Current limliting mark is set；
If the main control module realizes that the battery inversion system is in limited current state, and the transient current is stable
After step below the current limit threshold, step is also realized:
By the current limliting flag clear.
The battery inversion system further includes voltage detection module and drive module, institute in one of the embodiments,
Voltage detection module is stated for detecting the instantaneous voltage of the inverter module output, the drive module is for driving the inversion
Module exports corresponding output voltage and output electric current, the error according between the instantaneous filtered circuit and current limit threshold
The step of reducing the output voltage of the inverter module specifically:
The inverter module is reduced by pi regulator according to the error between the instantaneous filtered circuit and current limit threshold
Output given voltage；
The modulation ratio of the inverter module is calculated according to the output given voltage；
The inverter module is driven according to the modulation ratio.
The output voltage for increasing the inverter module is to the battery inversion system in one of the embodiments,
The step of demand voltage of driving equipment specifically:
Increase the output given voltage of the inverter module by presetting acceleration curve；
Amplitude limiting processing is carried out to the output given voltage after increase, the demand voltage is obtained, according to the demand voltage
Calculate the modulation ratio of the inverter module；
The inverter module is driven according to the modulation ratio；
The default acceleration curve meets:
M_VF=M_VF0+ △ T*Umax/AccT；
Wherein, M_VF0 is the current output given voltage of the inverter module, and Umax is that the maximum of the inverter module is defeated
Voltage out, AccT are that the current output given voltage is increased to the time that the maximum output voltage needs, and M_VF is institute
State the output given voltage that current output given voltage obtains after the growth of default fixed duration △ T.
Detailed description of the invention
Fig. 1 is the method flow diagram of the Current limited Control method of battery inversion system in an embodiment；
Fig. 2 is the method flow diagram of the Current limited Control method of battery inversion system in another embodiment；
Fig. 3 is the structural schematic diagram of the battery inversion system in an embodiment with Current limited Control function.
Specific embodiment
It is the method flow diagram of the Current limited Control method of battery inversion system in an embodiment referring to Fig. 1, Fig. 1.At this
In embodiment, which includes:
S101, the transient current of sampling inverter module output.
With the development of electric car, battery becomes the important power source of automobile, while also becoming vehicle-mounted electricity consumption
The energy source of equipment.Referring to Fig. 3, part electrical equipment 30 is by the city 50Hz/220V electric drive, and battery 10 is to these electrical equipments
During 30 are powered, these electricity consumptions will be supplied to after converting direct-current power into alternating-current power by inverter module 21 by, which needing, is set
Standby 30, in order to ensure the safety of these electrical equipments 30, the electricity supplied to battery 10 is needed when powering on to electrical equipment 30
Stream carries out Current limited Control, to prevent brief energization electric current from crossing senior general's equipment burnout.
S102, the size of the transient current and current limit threshold, if the transient current is greater than the current limit threshold,
It then controls the battery inversion system and enters limited current state, reduced according to the error between the transient current and current limit threshold
The output voltage of the inverter module, to reduce the transient current.
If the transient current of inverter module output is greater than current limit threshold, show the output electric current mistake of the battery inversion system
Greatly, system immediately enters limited current state, and reduces inverter module according to the error between instantaneous filtered circuit and current limit threshold
Output voltage, and then reduce it and export electric current, it ensures the safety of electrical equipment, electrical equipment overcurrent is avoided to burn.
For example, when the transient current significantly exceeds current limit threshold, the mistake between transient current and current limit threshold at this time
Spread value is larger, is rapidly dragged down the output voltage of inverter module according to the error, so that the output electric current of inverter module is fast
Speed decline, ensures the peace of electrical equipment in current limit threshold for the output current limit of inverter module within the scope of safety time
Entirely.
S103, if the transient current is decreased to less than equal to the current limit threshold, and the transient current is stable in institute
Current limit threshold is stated hereinafter, then increasing the output voltage of the inverter module to the demand of the battery inversion system driving equipment
Voltage.
After the output electric current to inverter module carries out quick current-limiting, output voltage decline, if inverter module exports
Transient current it is stable in current limit threshold hereinafter, the output voltage of inverter module need to be increased to the demand voltage of electrical equipment,
Such as 220V, the normal operation of electrical equipment is ensured.
The Current limited Control method of above-mentioned battery inversion system, the transient current including sampling inverter module output, compares
The size of transient current and current limit threshold, if transient current is greater than current limit threshold, battery inversion system enters limited current state, root
The output voltage for reducing inverter module according to the error between instantaneous filtered circuit and current limit threshold, if battery inversion system is in
Limited current state, and transient current it is stable in current limit threshold hereinafter, increasing the output voltage of inverter module to battery contravariant system
The demand voltage for driving equipment of uniting；Inversion mould is reduced according to the error between the transient current and current limit threshold of inverter module output
Then the output voltage of block increases the demand of its output voltage to electrical equipment by its transient current control in current limit threshold
Voltage；Battery inversion system output electric current may be implemented accurately to control in real time, it is simple and reliable, ensure the peace of electrical equipment
Entirely.
Referring to fig. 2, Fig. 2 is the method flow diagram of the Current limited Control method of battery inversion system in another embodiment.?
In the present embodiment, which includes:
S201, the transient current of sampling inverter module output.
S202 is filtered transient current to obtain instantaneous filtered circuit corresponding with transient current.
According to the transient current CurAfh that certain sampling period sample battery inversion system exports, i.e. inverter module
Electric current is exported, low pass digital filter is carried out to the intermittent transient current CurAfh and obtains continuous instantaneous filtered circuit
CurFlt, wherein the instantaneous filtered circuit CurFlt meets: CurFlt=CurAfh/4+3CurFlt/4.
The number of current peak when instantaneous filtered circuit often reaches primary current peak value, is added one by S203.
Sampling obtains the transient current CurAfh [K] of current battery system output, i.e. the output electric current of inverter module, right
The intermittent transient current CurAfh [K] carries out low pass digital filter and obtains continuous instantaneous filtered circuit, and obtains and the wink
When electric current CurAfh [K] corresponding instantaneous filtered circuit CurFlt [K].Meanwhile the wink obtained after double sampling filtering before obtaining
When filtered circuit CurFlt [K-1] and CurFlt [K-2], these current values are the absolute value of corresponding current, if CurFlt [K-
1] > CurAfh [K] and CurFlt [K-1] > CurFlt [K-2] show that instantaneous filtered circuit CurFlt [K-1] is current peak.
I.e. in the present embodiment, current peak includes wave crest and trough, and current peak is also possible to wave crest or wave in other embodiments
Paddy.
S204, the size of more instantaneous filtered circuit and current limit threshold enter if instantaneous filtered circuit is greater than current limit threshold
Step S205~S209 enters step S210~S215 if instantaneous filtered circuit is less than or equal to current limit threshold.
The current limit threshold LmtCurr for setting instantaneous filtered circuit, obtains the mistake between instantaneous filtered circuit and current limit threshold
Poor Err=CurFlt-LmtCurr reduces the output voltage of inverter module according to the error, and the control of instantaneous filtered circuit is being limited
It flows in threshold value, and then by the output current control of inverter module in current limit threshold.
S205, battery inversion system enter limited current state.
Current limliting mark is arranged in S206.
Status Flag is set for battery inversion system, characterizes its state, convenient for identification and analysis.For example, working as battery
When inversion system enters limited current state, which is set as 1, when battery inversion system enters flow increasing state, by this
Status Flag is set as 0.
S207 resets the number of current peak, and restarts to count the number of current peak.
S208 reduces the defeated of inverter module by pi regulator according to the error between instantaneous filtered circuit and current limit threshold
Given voltage out.
S209 calculates the modulation ratio of inverter module, return step S201 according to output given voltage.
Battery inversion system enters after limited current state, reduces it by reducing its output voltage and exports electric current.Root
The given electricity of output that battery inversion system is reduced by pi regulator according to the error between instantaneous filtered circuit and current limit threshold
Pressure calculates the modulation ratio of inverter module according to the output given voltage, and then inverter module is driven to generate the output given voltage,
And then reduces it and export electric current.
S210, judges whether battery inversion system is in limited current state, if so, S211 is entered step, if it is not, entering step
Rapid S215.
If the transient current of inverter module output is less than or equal to current limit threshold, and battery inversion system is not at current limliting shape
State shows that brief energization electric current is less than the current limliting that threat may be brought to electrical equipment when battery is powered on to electrical equipment
Threshold value, battery inversion system normally start according to the demand voltage of electrical equipment, do not enter limited current state.
Whether the number of S211, current peak reach amount threshold, if so, S212 is entered step, if it is not, returning to step
S201。
If above-mentioned instantaneous filtered circuit is less than or equal to current limit threshold, and the number of its current peak has reached certain amount,
Show that the output electric current of battery inversion system is stable to below current limit threshold.
S212, by current limliting flag clear.
S213 increases the output given voltage of inverter module by presetting acceleration curve.
After the output electric current to inverter module carries out quick current-limiting, it is stable to export electric current for output voltage decline
Under current limit threshold, increase the output given voltage of inverter module to the demand electricity of electrical equipment by presetting acceleration curve
Pressure.Output voltage recovery is carried out using adjustable curve, this is adjustable, and curve meets formula:
M_VF=M_VF0+ △ T*Umax/AccT；
Wherein, M_VF0 is the current output given voltage of inverter module, and Umax is the maximum output voltage of inverter module,
AccT is the time that current output given voltage is increased to maximum output voltage needs, and M_VF is current output given voltage warp
Cross the output given voltage obtained after the growth of default fixed duration △ T.
S214 carries out amplitude limiting processing to the output given voltage after increase, obtains demand voltage.
Since △ T is default fixed duration, the output given voltage of battery inversion system may during adjusting
Can be more than the demand voltage that sets of electricity consumption, need to carry out it amplitude limiting processing, and using the output given voltage after amplitude limiting processing as
The demand voltage of battery inversion system.Wherein, AccT is adjustable, and the growth speed of voltage can be adjusted according to practical application scene
Degree, the fast and reliable output given voltage by inverter module increases, and then outputs it the demand that voltage increases to electrical equipment
Voltage.
S215, voltage calculates the modulation ratio of inverter module according to demand.
S216 drives inverter module according to modulation ratio.
SVPWM (Space Vector Pulse Width Modulation, space vector arteries and veins are used according to the modulation ratio
Width modulation) method obtains the bridge in PWM (Pulse Width Modulation, pulse width modulation) signal driving inverter module
Arm timesharing movement.When battery inversion system is in limited current state, the output voltage of inverter module is dropped by pi regulator
Extremely above-mentioned output given voltage, and then the transient current output it lowers, and ensures the safety of electrical equipment；Restore in voltage
In the process, likewise, by the way that the output voltage of inverter module is adjusted to the demand voltage so that electrical equipment safety into
Enter normal operating conditions.
The method of the Current limited Control method of above-mentioned battery inversion system filters the transient current that inverter module exports
The instantaneous filtered circuit obtained after wave processing is compared with current limit threshold, if the instantaneous filtered circuit has been more than current limit threshold,
System passes through pi regulator for system automatically into limited current state, according to the error between the instantaneous filtered circuit and current limit threshold
Output voltage, i.e. the instantaneous voltage reduces, and then outputs it electric current, i.e., transient current lowers, and counts the instantaneous of acquisition
The peak value number of filtered circuit shows that the output electric current of system has been stable at limit if the peak value number has reached amount threshold
Threshold value is flowed hereinafter, the output given voltage of system to be increased to the demand voltage of electrical equipment by adjustable curve, ensures electricity consumption
The normal operation of equipment.Current limliting mark characterization system state in which is set simultaneously, to carry out state recognition and phase to system
It should handle.The Current limited Control method may be implemented battery inversion system output electric current and accurately control in real time, and method simply may be used
It leans on, has ensured the safety and normal operation of electrical equipment.
It is the structural schematic diagram of the battery inversion system in an embodiment with Current limited Control function referring to Fig. 3, Fig. 3.
In the present embodiment, it includes battery 10, inverter module 21, current detecting mould that this, which has the battery inversion system of current-limiting function,
Block 22 and main control module 23, inverter module 21 are used to the direct current that battery 30 exports being converted to alternating current, current detecting mould
Block 22 is used to sample the transient current of the output of inverter module 21, and the current limliting control of battery inversion system is stored on main control module 23
Processing procedure sequence, main control module 23 perform the steps of when executing Current limited Control program
Compare the size of transient current and current limit threshold, if transient current be greater than current limit threshold, battery inversion system into
Enter limited current state, reduces the output voltage of inverter module according to the error between instantaneous filtered circuit and current limit threshold；
If battery inversion system is in limited current state, and transient current it is stable in current limit threshold hereinafter, increasing inversion
The output voltage of module to battery inversion system driving equipment demand voltage.
In one of the embodiments, main control module 23 realize the step of size for comparing transient current and current limit threshold it
Before, also realize step:
Transient current is filtered to obtain instantaneous filtered circuit corresponding with transient current；
Obtain the number of the current peak of instantaneous filtered circuit.
The step of comparing the size of transient current and current limit threshold specifically: compare transient current and obtained after being filtered
Instantaneous filtered circuit and current limit threshold size.
After main control module 23 realizes the step of battery inversion system enters limited current state, step is also realized: by electric current
The number of peak value is reset.
Transient current it is stable current limit threshold in detail below are as follows:
Instantaneous filtered circuit is decreased to less than equal to current limit threshold, and the number of current peak reaches amount threshold.
In one of the embodiments, main control module 23 realize battery inversion system the step of entering limited current state it
Afterwards, step is also realized: setting current limliting mark.
If main control module 23 realizes that battery inversion system is in limited current state, and transient current is stable in current limit threshold
After following step, step is also realized: by current limliting flag clear.
Battery inversion system further includes voltage detection module 24 and drive module 25, electricity in one of the embodiments,
Pressure detection module 24 is used to detect the instantaneous voltage of the output of inverter module 21, and drive module 25 is for driving inverter module 21 to export
Corresponding output voltage and output electric current, reduce inverter module 21 according to the error between instantaneous filtered circuit and current limit threshold
The step of output voltage specifically:
Reduce the output of inverter module 21 by pi regulator according to the error between instantaneous filtered circuit and current limit threshold
Given voltage；
The modulation ratio of inverter module 21 is calculated according to output given voltage；
Inverter module 21 is driven according to modulation ratio.
Increase the output voltage of inverter module 21 in one of the embodiments, to battery inversion system driving equipment 30
Demand voltage the step of specifically:
Increase the output given voltage of inverter module 21 by presetting acceleration curve；
Amplitude limiting processing is carried out to the output given voltage after increase, obtains demand voltage, voltage calculates inversion according to demand
The modulation ratio of module 21；
Inverter module 21 is driven according to modulation ratio.
Default acceleration curve meets:
M_VF=M_VF0+ △ T*Umax/AccT；
Wherein, M_VF0 is the current output given voltage of inverter module 21, and Umax is the maximum output electricity of inverter module 21
Pressure, AccT are the time that current output given voltage is increased to maximum output voltage needs, and M_VF is the given electricity of current output
Press the output given voltage obtained after the growth of default fixed duration △ T.
The battery inversion system further includes filter circuit 26, and input terminal connects inverter module 21, and output end connects electricity consumption
Equipment 30, for inverter module 21 output electric current carry out low-pass filtering treatment after be given to electrical equipment 30, filter out high frequency at
Point, the fundamental voltage of the continuous sinusoidal variations of the needs of electrical equipment 30 is obtained, ensures the power supply quality of electrical equipment 30.
The above-mentioned battery inversion system with current-limiting function, is filtered place for the transient current that inverter module 21 exports
The instantaneous filtered circuit obtained after reason is compared with current limit threshold, if the instantaneous filtered circuit has been more than current limit threshold, system
Automatically into limited current state, pi regulator is passed through for inverter module according to the error between the instantaneous filtered circuit and current limit threshold
21 output voltage, the i.e. instantaneous voltage reduce, and then output it electric current, i.e., transient current lowers, and counts the wink of acquisition
When filtered circuit peak value number show that the output electric current of system has been stable at if the peak value number has reached amount threshold
The output given voltage of inverter module 21 hereinafter, is increased to the demand electricity of electrical equipment 30 by adjustable curve by current limit threshold
Pressure ensures the normal operation of electrical equipment 30.Current limliting mark characterization system state in which is set simultaneously, to carry out to system
State recognition and respective handling.The Current limited Control method may be implemented battery inversion system output electric current and accurately control in real time
System, method is simple and reliable, has ensured the safety and normal operation of electrical equipment 30.
Each technical characteristic of above embodiments can be combined arbitrarily, for simplicity of description, not to above-described embodiment
In each technical characteristic it is all possible combination be all described, as long as however, the combination of these technical characteristics be not present lance
Shield all should be considered as described in this specification.
Only several embodiments of the present invention are expressed for above embodiments, and the description thereof is more specific and detailed, but can not
Therefore it is construed as limiting the scope of the patent.It should be pointed out that for those of ordinary skill in the art,
Under the premise of not departing from present inventive concept, various modifications and improvements can be made, and these are all within the scope of protection of the present invention.
Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (10)
1. a kind of Current limited Control method of battery inversion system, the battery inversion system includes battery and is used for institute
The direct current for stating battery output is converted to the inverter module of alternating current, which is characterized in that the described method includes:
Sample the transient current of the inverter module output；
Compare the size of the transient current and current limit threshold, if the transient current is greater than the current limit threshold, controls institute
It states battery inversion system and enters limited current state, the inversion is reduced according to the error between the transient current and current limit threshold
The output voltage of module, to reduce the transient current；
If the transient current is decreased to less than equal to the current limit threshold, and the transient current is stable in the current limit threshold
Hereinafter, the demand electricity for the electrical equipment that output voltage to the battery inversion system for then increasing the inverter module is driven
Pressure；
After the step of transient current of the sampling inverter module output, further includes:
The transient current is filtered to obtain instantaneous filtered circuit corresponding with the transient current；
When the instantaneous filtered circuit often reaches primary current peak value, the number of current peak is added one；
The size of the transient current and current limit threshold is controlled if the transient current is greater than the current limit threshold
It makes the battery inversion system and enters limited current state, according to the error reduction between the transient current and current limit threshold
The step of output voltage of inverter module specifically:
Compare the size of the instantaneous filtered circuit and current limit threshold, if the instantaneous filtered circuit is greater than the current limit threshold,
It then controls the battery inversion system and enters limited current state, according to the error between the instantaneous filtered circuit and current limit threshold
Reduce the output voltage of the inverter module；
The transient current it is stable the current limit threshold in detail below are as follows:
The number of the current peak reaches amount threshold.
2. Current limited Control method according to claim 1, which is characterized in that
After the step of battery inversion system enters limited current state, further includes:
The number of the current peak is reset.
3. Current limited Control method according to claim 1, which is characterized in that the battery inversion system enters current limliting shape
After the step of state, further includes:
Current limliting mark is set；
If the battery inversion system is in limited current state, and the transient current is stable below in the current limit threshold
After step, further includes:
By the current limliting flag clear.
4. Current limited Control method according to claim 1, which is characterized in that described according to the instantaneous filtered circuit and limit
The step of error between stream threshold value reduces the output voltage of the inverter module specifically:
The defeated of the inverter module is reduced by pi regulator according to the error between the instantaneous filtered circuit and current limit threshold
Given voltage out；
The modulation ratio of the inverter module is calculated according to the output given voltage；
The inverter module is driven according to the modulation ratio.
5. Current limited Control method according to claim 1, which is characterized in that the output electricity for increasing the inverter module
The step of being depressed into the demand voltage of the battery inversion system driving equipment specifically:
Increase the output given voltage of the inverter module by presetting acceleration curve；
Amplitude limiting processing is carried out to the output given voltage after increase, obtains the demand voltage, is calculated according to the demand voltage
The modulation ratio of the inverter module；
The inverter module is driven according to the modulation ratio；
The default acceleration curve meets:
M_VF=M_VF0+ △ T*Umax/AccT；
Wherein, M_VF0 is the current output given voltage of the inverter module, and Umax is the maximum output electricity of the inverter module
Pressure, AccT are that the current output given voltage is increased to the time that the maximum output voltage needs, and M_VF is described works as
The output given voltage that preceding output given voltage obtains after the growth of default fixed duration △ T.
6. a kind of battery inversion system with Current limited Control function, which is characterized in that including battery, inverter module, electricity
Detection module and main control module are flowed, the inverter module is used to the direct current that the battery exports being converted to alternating current, institute
Current detection module is stated for sampling the transient current of the inverter module output, is stored with the electric power storage on the main control module
The Current limited Control program of pond inversion system, the main control module perform the steps of when executing the Current limited Control program
Compare the size of the transient current and current limit threshold, if the transient current is greater than the current limit threshold, controls institute
It states battery inversion system and enters limited current state, the inversion is reduced according to the error between the transient current and current limit threshold
The output voltage of module, to reduce the transient current；
If the transient current is decreased to less than equal to the current limit threshold, and the transient current is stable in the current limit threshold
Hereinafter, the demand electricity for the electrical equipment that output voltage to the battery inversion system for then increasing the inverter module is driven
Pressure；
Before the main control module realizes the step of size of the transient current and current limit threshold, also realization step:
The transient current is filtered to obtain instantaneous filtered circuit corresponding with the transient current；
When the instantaneous filtered circuit often reaches primary current peak value, the number of current peak is added one；
The size of the transient current and current limit threshold is controlled if the transient current is greater than the current limit threshold
It makes the battery inversion system and enters limited current state, according to the error reduction between the transient current and current limit threshold
The step of output voltage of inverter module specifically:
Compare the size of the instantaneous filtered circuit and current limit threshold, if the instantaneous filtered circuit is greater than the current limit threshold,
It then controls the battery inversion system and enters limited current state, according to the error between the instantaneous filtered circuit and current limit threshold
Reduce the output voltage of the inverter module；
The transient current it is stable the current limit threshold in detail below are as follows:
The number of the current peak reaches amount threshold.
7. battery inversion system according to claim 6, which is characterized in that the main control module realizes the battery
Inversion system entered after the step of limited current state, also realization step:
The number of the current peak is reset.
8. battery inversion system according to claim 6, which is characterized in that the main control module realizes the battery
Inversion system entered after the step of limited current state, also realization step:
Current limliting mark is set；
If the main control module realizes that the battery inversion system is in limited current state, and the transient current is stable in institute
After the step for stating current limit threshold or less, step is also realized:
By the current limliting flag clear.
9. battery inversion system according to claim 6, which is characterized in that the battery inversion system further includes electricity
Detection module and drive module are pressed, the voltage detection module is used to detect the instantaneous voltage of the inverter module output, described
Drive module is described according to the instantaneous filtering for driving the inverter module to export corresponding output voltage and output electric current
Error between electric current and current limit threshold reduces the step of output voltage of the inverter module specifically:
The defeated of the inverter module is reduced by pi regulator according to the error between the instantaneous filtered circuit and current limit threshold
Given voltage out；
The modulation ratio of the inverter module is calculated according to the output given voltage；
The inverter module is driven according to the modulation ratio.
10. battery inversion system according to claim 6, which is characterized in that described to increase the defeated of the inverter module
Out voltage to the battery inversion system driving equipment demand voltage the step of specifically:
Increase the output given voltage of the inverter module by presetting acceleration curve；
Amplitude limiting processing is carried out to the output given voltage after increase, obtains the demand voltage, is calculated according to the demand voltage
The modulation ratio of the inverter module；
The inverter module is driven according to the modulation ratio；
The default acceleration curve meets:
M_VF=M_VF0+ △ T*Umax/AccT；
Wherein, M_VF0 is the current output given voltage of the inverter module, and Umax is the maximum output electricity of the inverter module
Pressure, AccT are that the current output given voltage is increased to the time that the maximum output voltage needs, and M_VF is described works as
The output given voltage that preceding output given voltage obtains after the growth of default fixed duration △ T.
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