CN107332242A - The control circuit and control method of filtering integrated apparatus can be presented - Google Patents
The control circuit and control method of filtering integrated apparatus can be presented Download PDFInfo
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- CN107332242A CN107332242A CN201610279815.7A CN201610279815A CN107332242A CN 107332242 A CN107332242 A CN 107332242A CN 201610279815 A CN201610279815 A CN 201610279815A CN 107332242 A CN107332242 A CN 107332242A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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Abstract
The control circuit and control method of filtering integrated apparatus can be presented the present invention relates to a kind of, the control circuit includes：Comparison module, logical value is generated for the voltage of the first storage capacitor to be compared with the first preset value, and according to comparative result；Fundamental wave acquisition module, for obtaining the instantaneous active electric current of the frequency converter and the fundametal compoment of instantaneous reactive current；First computing module；Conversion module, carries out dq/abc conversion for the product value corresponding to the accumulated value and the fundametal compoment of the instantaneous reactive current in the output quantity to first computing module, obtains three-phase current；Second computing module；Control signal generation module, for generating the threephase switch signal for being used for controlling three-phase IGBT bridge arms in the integrated apparatus.In the present invention, the logical value generated using comparing unit is realized to be switched over to the active power filtering control function and energy feedback control function of integrated apparatus, can be reduced overall control complexity, be greatly reduced the workload of programming.
Description
Technical field
The present invention relates to technical field of circuit control, filtering integration can be presented more particularly, to one kind
The control circuit and control method of device.
Background technology
The system of motor run potential energy loading high, such as common elevator, oil field in living
In drag oil machine, typically all using frequency converter carry out speed governing.Current frequency converter is typically used
Uncontrollable rectifier, therefore when potential energy loading high is moved from high potential energy to low-potential energy, it is understood that there may be
" generating electricity " phenomenon, causes the voltage of frequency converter DC bus capacitor to raise.
In order to protect the electric capacity of frequency converter DC side, generally let out now using braking resistor
Put, this mode has the defect for wasting electric energy, triggering heat dissipation problem.Moreover, not controlling whole
Stream can also sharply increase the harmonic wave of power network, trigger power quality problem.But if not
Control rectification is changed to controlled rectification, can increase very high cost.Therefore filter can be presented by increase
The mode of ripple integrated apparatus, on the basis of this is not added to significantly, is realized humorous to power network
The improvement of ripple and the waste for reducing electric energy.
As shown in figure 1, motor M accesses power network through frequency converter, while driven oil-pumping machine is done
Cycle movement.The output end that filtering integrated apparatus can be presented is connected with power network, its energy storage electricity
Hold C2 through single-phase diode uncontrollable rectifier with frequency converter storage capacitor C1 to be connected.Can feedback filtering
The essence of integrated apparatus is one using three-phase voltage types of the IGBT as switching device
Bridge inverter main circuit.Filtering integrated apparatus can be presented to be equivalent to when potential energy loading high rises
Source filter, can be effectively reduced mains by harmonics；List is equivalent to when potential energy loading high declines
Position power factor inverter, with unity power factor can feed back to power network by energy.But,
Control circuit is to that can present the active power filtering function and energy feedback work(of filtering integrated apparatus at present
The control of energy is separation so that current overall control is more complicated, and programing work amount is big.
The content of the invention
For problem above, the technical problem to be solved in the present invention is that reduction can present filtering integration
The complexity of device, reduces programing work amount.
In order to solve the above technical problems, the present invention provides a kind of control of energy feedback filtering integrated apparatus
Circuit processed and control method.
In a first aspect, the control circuit that the present invention is provided includes：
Comparison module, for the voltage of the first storage capacitor to be compared with the first preset value, and root
Logical value is generated according to comparative result；It is less than or equal in the voltage of first storage capacitor described
During the first preset value, the logical value is 1, and otherwise the logical value is 0；First energy storage
Electric capacity is the storage capacitor for the frequency converter being connected with the integrated apparatus；
Fundamental wave acquisition module, for the three-phase input current according to the frequency converter, obtains described
The fundametal compoment and the fundametal compoment of instantaneous reactive current of the instantaneous active electric current of frequency converter；
First computing module, for the voltage of the second preset value and the second storage capacitor to be made into poor,
And PI computings are carried out to obtained difference, obtain current adjustment；It is additionally operable to instantaneously have described
The three of the fundametal compoment of work(electric current, the fundametal compoment of the instantaneous reactive current and the frequency converter
The logical value that phase input current is generated with the comparison module respectively is multiplied, and obtains corresponding product
Value, and the product value corresponding to the fundametal compoment of the instantaneous active electric current and the electric current are adjusted
Section amount adds up, and by obtained accumulated value and except the fundametal compoment institute of the instantaneous active electric current is right
Remaining four product value output outside the product value answered；Second storage capacitor is described one
Body disguises the storage capacitor in putting；
Conversion module, for the accumulated value in the output quantity to first computing module and described
Product value corresponding to the fundametal compoment of instantaneous reactive current carries out dq/abc conversion, obtains three-phase
Electric current, and the three-phase current is exported；
Second computing module, for by frequency converter described in the output quantity of first computing module
Three-phase input current corresponding to product value in each product value and the conversion module
In-phase current in the three-phase current of output makees poor, and it is defeated to make poor obtained each phase current
Go out；
Control signal generation module, for the three-phase current that is exported according to the integrated apparatus and
The three-phase current of the second computing module output, is generated for controlling in the integrated apparatus
The threephase switch signal of three-phase IGBT bridge arms.
Optionally, the fundamental wave acquisition module includes：
Converter unit, abc/dq conversion is carried out for the three-phase input current to the frequency converter,
Obtain the instantaneous active electric current and the instantaneous reactive current；
Low-pass filter unit, for entering to the instantaneous active electric current and the instantaneous reactive current
Row filtering, obtains the fundametal compoment of the instantaneous active electric current and the base of the instantaneous reactive current
Wave component.
Optionally, the circuit also includes：
Phase-locked loop module, respectively with the conversion in the conversion module and the fundamental wave acquisition module
Unit is connected, and is carried out lock phase processor for the phase voltage to power network, is obtained sinusoidal signal and cosine
Signal, and obtained sinusoidal signal and cosine signal are exported to the conversion module and the change
Change unit.
Optionally, the control signal generation module includes：
Make poor unit, for each phase in the three-phase current that exports second computing module
In-phase current in the three-phase current that electric current is exported with the integrated apparatus makees poor, and will obtain
Difference output；
Control unit, for carrying out triangular carrier line to described each difference for making poor unit output
Property control, generate the threephase switch signal.
Optionally, the span of first preset value is：
2.45U1≤K1≤UC1max
Wherein, K1For first preset value, U1For the frequency converter grid side phase voltage
Virtual value, UC1maxFor the maximum withstanding voltage value of first storage capacitor.
Optionally, the span of second preset value is：
K1≤K2≤UC2max
Wherein, K1For first preset value, K2For second preset value, UC2maxFor institute
State the maximum withstanding voltage value of the second storage capacitor.
Second aspect, the control method that the present invention is provided includes：
The voltage of first storage capacitor is compared with the first preset value, and generated according to comparative result
Logical value；When the voltage of first storage capacitor is less than or equal to first preset value,
The logical value is 1, and otherwise the logical value is 0；First storage capacitor be and described one
The storage capacitor of the frequency converter of connection is put in body makeup；
According to the three-phase input current of the frequency converter, the instantaneous active electricity of the frequency converter is obtained
The fundametal compoment of stream and the fundametal compoment of instantaneous reactive current；
The voltage of second preset value and the second storage capacitor is made poor, and obtained difference is carried out
PI computings, obtain current adjustment；Second storage capacitor is in the integrated apparatus
Storage capacitor；
By the fundametal compoment of the instantaneous active electric current, the fundametal compoment of the instantaneous reactive current
And the three-phase input current of the frequency converter is multiplied with the logical value of generation respectively, obtains corresponding
Product value, and by the product value corresponding to the fundametal compoment of the instantaneous active electric current and the electricity
Flow regulated quantity to add up, obtain accumulated value；
To the product value corresponding to the fundametal compoment of the accumulated value and the instantaneous reactive current
Dq/abc conversion is carried out, three-phase current is obtained；
Each in the corresponding product value of the three-phase input current of the frequency converter is multiplied
Product value makees poor with the in-phase current in the three-phase current obtained after being converted through dq/abc, obtains three-phase
Difference current；
The three-phase current and the three-phase difference current exported according to the integrated apparatus, generation
Threephase switch signal for controlling three-phase IGBT bridge arms in the integrated apparatus.
Optionally, the three-phase input current according to the frequency converter, obtains the frequency converter
Instantaneous active electric current fundametal compoment and the fundametal compoment of instantaneous reactive current, including：
Abc/dq conversion is carried out to the three-phase input current of the frequency converter, obtains described instantaneously having
Work(electric current and the instantaneous reactive current；
The instantaneous active electric current and the instantaneous reactive current are filtered, the wink is obtained
When watt current fundametal compoment and the fundametal compoment of the instantaneous reactive current.
Optionally, this method also includes：
The phase voltage of power network carries out lock phase processor, obtains sinusoidal signal and cosine signal, it is described just
String signal and the cosine signal are used for dq/abc conversion and the abc/dq conversion processes
In.
Optionally, the three-phase current exported according to the integrated apparatus and three difference
It is worth electric current, generates the threephase switch for controlling three-phase IGBT bridge arms in the integrated apparatus
Signal, including：
Each phase current in the three-phase difference current and the integrated apparatus are exported
In-phase current in three-phase current makees poor, and it is linear to carry out triangular carrier to each obtained difference
Control, generates the threephase switch signal
In control circuit and control method that the present invention is provided, when logical value is 1, generation
Threephase switch signal is controlled to the three-phase IGBT bridge arms in integrated apparatus, you can to one
The active power filtering function that body makeup is put is controlled, so as to suppress harmonic wave.When logical value is 0,
Biochemical threephase switch signal is controlled to the three-phase IGBT bridge arms in integrated apparatus, i.e.,
The energy feedback function of integrated apparatus can be controlled, so as to reduce the waste of electric energy.Can
See, the logical value that the present invention is generated using comparing unit realizes the active power filtering to integrated apparatus
Control function and energy feedback control function are switched over, and can reduce overall control complicated
Degree, greatly reduces the workload of programming.
Brief description of the drawings
The characteristic information and advantage of the present invention, accompanying drawing can be more clearly understood from by reference to accompanying drawing
It is schematical and should not be construed as carrying out the present invention any limitation, in the accompanying drawings：
Fig. 1, which is shown, can present filtering integrated apparatus and frequency converter, the connection diagram of power network；
Fig. 2, which is shown, can present the embodiment of control circuit one of filtering integrated apparatus according to the present invention
Structured flowchart；
Fig. 3 shows that the control circuit provided using the present invention is entered to that can present filtering integrated apparatus
Power network current oscillogram before row control；
Fig. 4 shows that the control circuit provided using the present invention is entered to that can present filtering integrated apparatus
Power network current oscillogram after row control；
Fig. 5 shows that can present filtering integrated apparatus is operated in unity power factor energy feedback shape
The electric current and the oscillogram of line voltage exported during state.
Embodiment
In order to be more clearly understood that the above objects, features and advantages of the present invention, tie below
The drawings and specific embodiments are closed the present invention is further described in detail.Need explanation
It is that, in the case where not conflicting, the feature in embodiments herein and embodiment can be mutual
Combination.
Elaborate many details in the following description to facilitate a thorough understanding of the present invention, but
It is that the present invention can also be different from other modes described here to implement using other, therefore,
Protection scope of the present invention is not limited by following public specific embodiment.
The present invention provides a kind of control circuit of energy feedback filtering integrated apparatus, as shown in Fig. 2
The control circuit includes：
Comparison module, for by the voltage U of the first storage capacitorC1With the first preset value K1Compare,
And logical value m is generated according to comparative result；In the voltage U of first storage capacitorC1It is less than
Or equal to the first preset value K1When, the logical value m is 1, otherwise the logical value m
For 0；Wherein：First storage capacitor is the frequency converter being connected with the integrated apparatus
Storage capacitor；The storage capacitor is represented with C1 in Fig. 1；
Fundamental wave acquisition module, for the three-phase input current i according to the frequency convertera、ib、ic,
Obtain the fundametal compoment i ' of the instantaneous active electric current of the frequency converterpWith the base of instantaneous reactive current
Wave component i 'q；
First computing module, for by the second preset value K2With the voltage U of the second storage capacitorC2
It is poor to make, and carries out PI computings to the difference, obtains current adjustment Δ ip；Being additionally operable to will be described
The fundametal compoment i ' of instantaneous active electric currentp, the instantaneous reactive current fundametal compoment i 'qAnd it is described
The three-phase input current i of frequency convertera、ib、icThe logical value m generated respectively with the comparison module
It is multiplied, obtains corresponding product valuei″q、i′a、i′b、i′c, and by the instantaneous active electric current
Fundametal compoment i 'pCorresponding product valueWith the current adjustment Δ ipIt is cumulative, and will obtain
Accumulated value i "pWith in addition to the product value corresponding to the fundametal compoment of the instantaneous active electric current
Remaining four product value i "q、i′a、i′b、i′cOutput；Second storage capacitor is the one
Disguise the storage capacitor C2 in putting；
Conversion module, for the accumulated value i " in the output quantity to first computing modulepAnd institute
State the product value i " corresponding to the fundametal compoment of instantaneous reactive currentqDq/abc conversion is carried out, is obtained
Three-phase current iaf、ibf、icf, and by three-phase current iaf、ibf、icfOutput；
Second computing module, for by frequency converter described in the output quantity of first computing module
Three-phase input current corresponding to product value i 'a、i′b、i′cIn each product value with it is described
The three-phase current i of conversion module outputaf、ibf、icfIn in-phase current make it is poor, and will make it is poor must
The each phase current arrivedOutput；
Control signal generation module, for the three-phase current exported according to the integrated apparatus
iai、ibi、iciThe three-phase current exported with second computing moduleGeneration is used
In the threephase switch signal S for controlling three-phase IGBT bridge arms in the integrated apparatusa、Sb、Sc。
It should be appreciated that when logical value m is 1, i 'p、i′q、ia、ib、icIt is multiplied with 1,
Keep constant, thereforei″q=i 'q、i′a=ia、i′b=ib、i′c=ic.By current adjustment Δ ip
Be added to the fundametal compoment i ' of instantaneous active electric currentpCorresponding product valueAfter upper,
i″p、i″qThe three-phase current i obtained after dq/abc is convertedaf、ibf、icfContaining only fundamental wave and can
Integrated apparatus DC-side Voltage Stabilization is kept, therefore in the output quantity of first computing module
Described in frequency converter three-phase input current corresponding to product value i 'a、i′b、i′cWith three-phase current
iaf、ibf、icfCorrespondence is made after difference, obtains that integrated apparatus DC-side Voltage Stabilization can be kept
Three-phase currentThe three-phase currentAs harmonic current.Then
The three-phase current i that integrated apparatus is exportedai、ibi、iciAs feedback quantity, according to three-phase current iai、
ibi、iciAnd three-phase currentGenerate threephase switch signal Sa、Sb、Sc.Then it is sharp
With threephase switch signal Sa、Sb、ScThree-phase IGBT bridge arms in integrated apparatus are controlled
System, you can the active power filtering function to integrated apparatus is controlled, so as to realize effective reduction
The function of mains by harmonics.
It should be appreciated that when logical value m is 0, i 'p、i′q、ia、ib、icAfter being multiplied with 0
It is 0, i.e.,i″q=0, i 'a=0, i 'b=0, i 'c=0.By current adjustment Δ ipIt is added to
The fundametal compoment i ' of instantaneous active electric currentpCorresponding product valueAfter upper,
Wherein, i "p=Δ ipPurpose be control integrated apparatus DC-side Voltage Stabilization, i "q=0 purpose
It is that the electric current for exporting integrated apparatus does not contain reactive component, that is, ensures with unity power factor
Feedback energy.Therefore by i "p、i″qThe three-phase current i obtained after dq/abc is convertedaf、ibf、icf
Unity power factor feedback energy can be controlled and integrated apparatus DC-side Voltage Stabilization can be kept.
Then three-phase current i integrated apparatus exportedai、ibi、iciAs feedback quantity, according to three-phase
Electric current iai、ibi、iciAnd three-phase currentGenerate threephase switch signal Sa、Sb、Sc。
Utilize threephase switch signal Sa、Sb、ScThree-phase IGBT bridge arms in integrated apparatus are carried out
Control, you can be controlled to the energy feedback function of integrated apparatus, so as to reduce electric energy
Waste.
It can be seen that, when logical value is 1, the threephase switch signal of generation is in integrated apparatus
Three-phase IGBT bridge arms are controlled, you can the active power filtering function to integrated apparatus is controlled
System, so as to suppress harmonic wave.When logical value is 0, biochemical threephase switch signal is to integration
Three-phase IGBT bridge arms in device are controlled, you can to the energy feedback work(of integrated apparatus
It can be controlled, so as to reduce the waste of electric energy.The logic that the present invention is generated using comparing unit
Value is realized to be carried out to the active power filtering control function and energy feedback control function of integrated apparatus
Switching, can reduce overall control complexity, greatly reduce the workload of programming.
In the specific implementation, the fundamental wave acquisition module can include：
Converter unit, for the three-phase input current i to the frequency convertera、ib、icCarry out abc/dq
Conversion, obtains the instantaneous active electric current ipWith the instantaneous reactive current iq；
Low-pass filter unit, for the instantaneous active electric current ipWith the instantaneous reactive current
iqIt is filtered, obtains the instantaneous active electric current ipFundametal compoment i 'pWith the instantaneous reactive
Electric current iqFundametal compoment i 'q。
In the specific implementation, the control circuit can also include：
Phase-locked loop module, respectively with the conversion in the conversion module and the fundamental wave acquisition module
Unit is connected, and is carried out lock phase processor for the phase voltage to power network, is obtained sinusoidal signal and cosine
Signal, and obtained sinusoidal signal and cosine signal are exported to the conversion module and the change
Change unit.
Carried out it should be appreciated that carrying out dq/abc conversion and converter unit in conversion module
It is to need to carry out phase angle calculating according to sinusoidal signal and cosine signal, here during abc/dq
Sinusoidal signal and cosine signal are generated using the phase voltage of power network, for example with power network with it is integrated
The A phase voltages of the tie point of device.
In the specific implementation, the control signal generation module includes：
Make poor unit, for the three-phase current for exporting second computing module
In the three-phase current i that exports of each phase current and the integrated apparatusai、ibi、iciIn it is same
It is poor that phase current is made, and by obtained each difference ica、icb、iccOutput；
Control unit, for each difference i for making poor unit outputca、icb、iccCarry out
Triangular carrier Linear Control, generates the threephase switch signal Sa、Sb、Sc。
Wherein, as shown in Fig. 2 control unit can be using PWM generator according to triangular carrier
Generate threephase switch signal Sa、Sb、Sc。
In the specific implementation, the span of first preset value can be：
2.45U1≤K1≤UC1max
Wherein, K1For first preset value, U1For the frequency converter grid side phase voltage
Virtual value, UC1maxFor the maximum withstanding voltage value of first storage capacitor.
In the specific implementation, the span of second preset value can be：
K1≤K2≤UC2max
Wherein, K1For first preset value, K2For second preset value, UC2maxFor institute
State the maximum withstanding voltage value of the second storage capacitor.
The simulation model of circuit as shown in Figure 1 is built below by MATLAB softwares, to energy
The function of feedback filtering integrated apparatus is verified：
The upstroke of oil pumper is controlled using control circuit as shown in Figure 2 first.
Fig. 3 is controlled for the control circuit provided using the present invention to that can present filtering integrated apparatus
The mains by harmonics aberration rate shown in power network current oscillogram before system, Fig. 3 is 16.27%.
Fig. 4 is controlled it for the control circuit provided using the present invention to that can present filtering integrated apparatus
The mains by harmonics aberration rate shown in power network current oscillogram afterwards, Fig. 4 is 2.57%, is thus tested
Having demonstrate,proved the control circuit of the invention provided can present that can present when filtering integrated apparatus is controlled
Filter the active power filtering function of integrated apparatus.
Then, the down stroke of oil pumper is controlled using control circuit as shown in Figure 2.
Fig. 5 is when can present filtering integrated apparatus to be operated in unity power factor energy feedback state
The electric current and the oscillogram of line voltage exported.Filtering integrated apparatus can be presented operationally,
Power network three-phase phase voltage is with the phase angle difference of three-phase current that can present filtering integrated apparatus output
180 °, filtering integrated apparatus can be presented with unity power factor by energy feedback to power network.
Thus the control circuit of the invention provided is provided and is controlled to filtering integrated apparatus can be presented
When can present filtering integrated apparatus energy feedback function.Amplitude is higher for voltage in Figure 5
Waveform, less amplitude is current waveform.
Based on identical inventive concept, the present invention also provides a kind of can present and filters integrated apparatus
Control method, this method includes：
The voltage of first storage capacitor is compared with the first preset value, and generated according to comparative result
Logical value；When the voltage of first storage capacitor is less than or equal to first preset value,
The logical value is 1, and otherwise the logical value is 0；First storage capacitor be and described one
The storage capacitor of the frequency converter of connection is put in body makeup；
According to the three-phase input current of the frequency converter, the instantaneous active electricity of the frequency converter is obtained
The fundametal compoment of stream and the fundametal compoment of instantaneous reactive current；
The voltage of second preset value and the second storage capacitor is made poor, and obtained difference is carried out
PI computings, obtain current adjustment；
By the fundametal compoment of the instantaneous active electric current, the fundametal compoment of the instantaneous reactive current
And the three-phase input current of the frequency converter is multiplied with the logical value of generation respectively, obtains corresponding
Product value, and by the product value corresponding to the fundametal compoment of the instantaneous active electric current and the electricity
Flow regulated quantity to add up, obtain accumulated value；Second storage capacitor is in the integrated apparatus
Storage capacitor；
To the product value corresponding to the fundametal compoment of the accumulated value and the instantaneous reactive current
Dq/abc conversion is carried out, three-phase current is obtained；
Each in the corresponding product value of the three-phase input current of the frequency converter is multiplied
Product value makees poor with the in-phase current in the three-phase current obtained after being converted through dq/abc, obtains three-phase
Difference current；
The three-phase current and the three-phase difference current exported according to the integrated apparatus, generation
Threephase switch signal for controlling three-phase IGBT bridge arms in the integrated apparatus.
Optionally, the three-phase input current according to the frequency converter, obtains the frequency converter
Instantaneous active electric current fundametal compoment and the fundametal compoment of instantaneous reactive current, including：
Abc/dq conversion is carried out to the three-phase input current of the frequency converter, obtains described instantaneously having
Work(electric current and the instantaneous reactive current；
The instantaneous active electric current and the instantaneous reactive current are filtered, the wink is obtained
When watt current fundametal compoment and the fundametal compoment of the instantaneous reactive current.
Optionally, this method also includes：
The phase voltage of power network carries out lock phase processor, obtains sinusoidal signal and cosine signal, it is described just
String signal and the cosine signal are used for dq/abc conversion and the abc/dq conversion processes
In.
Optionally, the three-phase current exported according to the integrated apparatus and three difference
It is worth electric current, generates the threephase switch for controlling three-phase IGBT bridge arms in the integrated apparatus
Signal, including：
Each phase current in the three-phase difference current and the integrated apparatus are exported
In-phase current in three-phase current makees poor, and it is linear to carry out triangular carrier to each obtained difference
Control, generates the threephase switch signal.
In the present invention, term " first ", " second " are only used for describing purpose, and can not
It is interpreted as indicating or implying relative importance.Term " multiple " refers to two or more, removes
It is non-separately to have clear and definite restriction.
Although being described in conjunction with the accompanying embodiments of the present invention, those skilled in the art can
To make various modifications and variations without departing from the spirit and scope of the present invention, so
Modifications and variations each fall within and be defined by the appended claims within the scope of.
Claims (10)
1. a kind of control circuit of energy feedback filtering integrated apparatus, including：
Comparison module, for the voltage of the first storage capacitor to be compared with the first preset value, and root
Logical value is generated according to comparative result；It is less than or equal in the voltage of first storage capacitor described
During the first preset value, the logical value is 1, and otherwise the logical value is 0；First energy storage
Electric capacity is the storage capacitor for the frequency converter being connected with the integrated apparatus；
Fundamental wave acquisition module, for the three-phase input current according to the frequency converter, obtains described
The fundametal compoment and the fundametal compoment of instantaneous reactive current of the instantaneous active electric current of frequency converter；
First computing module, for the voltage of the second preset value and the second storage capacitor to be made into poor,
And PI computings are carried out to obtained difference, obtain current adjustment；It is additionally operable to instantaneously have described
The three of the fundametal compoment of work(electric current, the fundametal compoment of the instantaneous reactive current and the frequency converter
The logical value that phase input current is generated with the comparison module respectively is multiplied, and obtains corresponding product
Value, and the product value corresponding to the fundametal compoment of the instantaneous active electric current and the electric current are adjusted
Section amount adds up, and by obtained accumulated value and except the fundametal compoment institute of the instantaneous active electric current is right
Remaining four product value output outside the product value answered；Second storage capacitor is described one
Body disguises the storage capacitor in putting；
Conversion module, for the accumulated value in the output quantity to first computing module and described
Product value corresponding to the fundametal compoment of instantaneous reactive current carries out dq/abc conversion, obtains three-phase
Electric current, and the three-phase current is exported；
Second computing module, for by frequency converter described in the output quantity of first computing module
Three-phase input current corresponding to product value in each product value and the conversion module
In-phase current in the three-phase current of output makees poor, and it is defeated to make poor obtained each phase current
Go out；
Control signal generation module, for the three-phase current that is exported according to the integrated apparatus and
The three-phase current of the second computing module output, is generated for controlling in the integrated apparatus
The threephase switch signal of three-phase IGBT bridge arms.
2. circuit according to claim 1, it is characterised in that the fundamental wave acquisition module
Including：
Converter unit, abc/dq conversion is carried out for the three-phase input current to the frequency converter,
Obtain the instantaneous active electric current and the instantaneous reactive current；
Low-pass filter unit, for entering to the instantaneous active electric current and the instantaneous reactive current
Row filtering, obtains the fundametal compoment of the instantaneous active electric current and the base of the instantaneous reactive current
Wave component.
3. circuit according to claim 2, it is characterised in that also include：
Phase-locked loop module, respectively with the conversion in the conversion module and the fundamental wave acquisition module
Unit is connected, and is carried out lock phase processor for the phase voltage to power network, is obtained sinusoidal signal and cosine
Signal, and obtained sinusoidal signal and cosine signal are exported to the conversion module and the change
Change unit.
4. circuit according to claim 1, it is characterised in that the control signal generation
Module includes：
Make poor unit, for each phase in the three-phase current that exports second computing module
In-phase current in the three-phase current that electric current is exported with the integrated apparatus makees poor, and will obtain
Difference output；
Control unit, for carrying out triangular carrier line to described each difference for making poor unit output
Property control, generate the threephase switch signal.
5. circuit according to claim 1, it is characterised in that first preset value
Span is：
2.45U1≤K1≤UC1max
Wherein, K1For first preset value, U1For the frequency converter grid side phase voltage
Virtual value, UC1maxFor the maximum withstanding voltage value of first storage capacitor.
6. circuit according to claim 1, it is characterised in that second preset value
Span is：
K1≤K2≤UC2max
Wherein, K1For first preset value, K2For second preset value, UC2maxFor institute
State the maximum withstanding voltage value of the second storage capacitor.
7. a kind of control method of energy feedback filtering integrated apparatus, including：
The voltage of first storage capacitor is compared with the first preset value, and generated according to comparative result
Logical value；When the voltage of first storage capacitor is less than or equal to first preset value,
The logical value is 1, and otherwise the logical value is 0；First storage capacitor be and described one
The storage capacitor of the frequency converter of connection is put in body makeup；
According to the three-phase input current of the frequency converter, the instantaneous active electricity of the frequency converter is obtained
The fundametal compoment of stream and the fundametal compoment of instantaneous reactive current；
The voltage of second preset value and the second storage capacitor is made poor, and obtained difference is carried out
PI computings, obtain current adjustment；Second storage capacitor is in the integrated apparatus
Storage capacitor；
By the fundametal compoment of the instantaneous active electric current, the fundametal compoment of the instantaneous reactive current
And the three-phase input current of the frequency converter is multiplied with the logical value of generation respectively, obtains corresponding
Product value, and by the product value corresponding to the fundametal compoment of the instantaneous active electric current and the electricity
Flow regulated quantity to add up, obtain accumulated value；
To the product value corresponding to the fundametal compoment of the accumulated value and the instantaneous reactive current
Dq/abc conversion is carried out, three-phase current is obtained；
Each in the corresponding product value of the three-phase input current of the frequency converter is multiplied
Product value makees poor with the in-phase current in the three-phase current obtained after being converted through dq/abc, obtains three-phase
Difference current；
The three-phase current and the three-phase difference current exported according to the integrated apparatus, generation
Threephase switch signal for controlling three-phase IGBT bridge arms in the integrated apparatus.
8. method according to claim 7, it is characterised in that described according to the frequency conversion
The three-phase input current of device, obtains fundametal compoment and the wink of the instantaneous active electric current of the frequency converter
When reactive current fundametal compoment, including：
Abc/dq conversion is carried out to the three-phase input current of the frequency converter, obtains described instantaneously having
Work(electric current and the instantaneous reactive current；
The instantaneous active electric current and the instantaneous reactive current are filtered, the wink is obtained
When watt current fundametal compoment and the fundametal compoment of the instantaneous reactive current.
9. method according to claim 8, it is characterised in that also include：
The phase voltage of power network carries out lock phase processor, obtains sinusoidal signal and cosine signal, it is described just
String signal and the cosine signal are used for dq/abc conversion and the abc/dq conversion processes
In.
10. method according to claim 7, it is characterised in that described according to described one
Body disguises the three-phase current and the three-phase difference current for putting output, generates for controlling described one
Body disguises the threephase switch signal for putting middle three-phase IGBT bridge arms, including：
Each phase current in the three-phase difference current and the integrated apparatus are exported
In-phase current in three-phase current makees poor, and it is linear to carry out triangular carrier to each obtained difference
Control, generates the threephase switch signal.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102157934A (en) * | 2011-03-04 | 2011-08-17 | 中电普瑞科技有限公司 | Method for uniformly controlling active power quality control devices |
| CN102290815A (en) * | 2011-08-22 | 2011-12-21 | 湖北三环发展股份有限公司 | APF (active power filter) based on coupling inductance |
| CN104280593A (en) * | 2014-10-21 | 2015-01-14 | 国家电网公司 | Quick harmonic and reactive current detection method based on instantaneous reactive power theory |
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2016
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102157934A (en) * | 2011-03-04 | 2011-08-17 | 中电普瑞科技有限公司 | Method for uniformly controlling active power quality control devices |
| CN102290815A (en) * | 2011-08-22 | 2011-12-21 | 湖北三环发展股份有限公司 | APF (active power filter) based on coupling inductance |
| CN104280593A (en) * | 2014-10-21 | 2015-01-14 | 国家电网公司 | Quick harmonic and reactive current detection method based on instantaneous reactive power theory |
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