CN107332242B - Control circuit and control method of energy-feedback filtering integrated device - Google Patents
Control circuit and control method of energy-feedback filtering integrated device Download PDFInfo
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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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- 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
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Abstract
The invention relates to a control circuit and a control method of an energy-feedback filtering integrated device, wherein the control circuit comprises: the comparison module is used for comparing the voltage of the first energy storage capacitor with a first preset value and generating a logic value according to a comparison result; the fundamental wave acquisition module is used for acquiring the fundamental wave components of instantaneous active current and instantaneous reactive current of the frequency converter; a first operation module; the conversion module is used for carrying out dq/abc conversion on the accumulated value in the output quantity of the first operation module and a product value corresponding to the fundamental component of the instantaneous reactive current to obtain three-phase current; a second operation module; and the control signal generation module is used for generating three-phase switching signals for controlling three-phase IGBT bridge arms in the integration device. In the invention, the logic value generated by the comparison unit is used for switching the active filter control function and the energy feedback control function of the integrated device, so that the overall control complexity can be reduced, and the programming workload can be greatly reduced.
Description
Technical Field
The invention relates to the technical field of circuit control, in particular to a control circuit and a control method of an energy-feedback filtering integrated device.
Background
Systems for driving potential energy loads by motors, such as elevators and oil tractors in oil fields, which are common in life, generally adopt frequency converters for speed regulation. The existing frequency converter generally adopts uncontrolled rectification, so that when a potential energy load moves from high potential energy to low potential energy, a phenomenon of 'reverse power generation' may exist, and the voltage of a direct-current side capacitor of the frequency converter is increased.
In order to protect the capacitor on the direct current side of the frequency converter, the brake resistor is commonly used for discharging at present, and the mode has the defects of electric energy waste and heat dissipation problem. In addition, uncontrolled rectification also causes the harmonic wave of the power grid to increase sharply, which causes the problem of power quality. However, if the uncontrolled rectification is changed to the controlled rectification, the cost is increased. Therefore, by adding the energy-feed and filtering integrated device, the harmonic wave of the power grid can be treated and the waste of electric energy can be reduced on the basis of not increasing the cost greatly.
As shown in fig. 1, the motor M is connected to the power grid through a frequency converter, and simultaneously drags the pumping unit to make periodic motion. The output end of the energy feeding and filtering integrated device is connected with a power grid, and the energy storage capacitor C2 of the energy feeding and filtering integrated device is connected with the energy storage capacitor C1 of the frequency converter through single-phase diode uncontrolled rectification. The essence of the energy-feeding and filtering integrated device is a three-phase voltage type bridge inverter circuit which adopts IGBT as a switching device. The energy-feedback filtering integrated device is equivalent to an active filter when the potential energy load rises, so that the harmonic wave of a power grid can be effectively reduced; when the potential energy load is reduced, the inverter is equivalent to a unit power factor inverter, and the energy can be fed back to the power grid by the unit power factor. However, the control of the active filtering function and the energy feedback function of the energy feedback and filtering integrated device by the control circuit is separated, so that the current overall control is complex and the programming workload is large.
Disclosure of Invention
Aiming at the problems, the technical problem to be solved by the invention is to reduce the complexity of the energy-feed filtering integrated device and reduce the programming workload.
In order to solve the technical problem, the invention provides a control circuit and a control method of an energy-feedback filtering integrated device.
In a first aspect, the present invention provides a control circuit comprising:
the comparison module is used for comparing the voltage of the first energy storage capacitor with a first preset value and generating a logic value according to a comparison result; when the voltage of the first energy storage capacitor is smaller than or equal to the first preset value, the logic value is 1, otherwise, the logic value is 0; the first energy storage capacitor is an energy storage capacitor of a frequency converter connected with the integrated device;
the fundamental wave acquisition module is used for acquiring a fundamental wave component of instantaneous active current and a fundamental wave component of instantaneous reactive current of the frequency converter according to the three-phase input current of the frequency converter;
the first operation module is used for making a difference between a second preset value and the voltage of the second energy storage capacitor, and performing PI operation on the obtained difference value to obtain a current regulating quantity; the current regulation quantity is also used for multiplying the fundamental component of the instantaneous active current, the fundamental component of the instantaneous reactive current and the three-phase input current of the frequency converter by the logic values generated by the comparison module respectively to obtain corresponding product values, accumulating the product value corresponding to the fundamental component of the instantaneous active current and the current regulation quantity, and outputting the accumulated value and the other four product values except the product value corresponding to the fundamental component of the instantaneous active current; the second energy storage capacitor is an energy storage capacitor in the integrated device;
the conversion module is used for carrying out dq/abc conversion on the accumulated value in the output quantity of the first operation module and a product value corresponding to the fundamental component of the instantaneous reactive current to obtain three-phase current and outputting the three-phase current;
the second operation module is used for making a difference between each product value of product values corresponding to three-phase input current of the frequency converter in the output quantity of the first operation module and in-phase current of the three-phase current output by the conversion module, and outputting each phase current obtained by making the difference;
and the control signal generation module is used for generating a three-phase switching signal for controlling a three-phase IGBT bridge arm in the integrated device according to the three-phase current output by the integrated device and the three-phase current output by the second operation module.
Optionally, the fundamental wave obtaining module includes:
the conversion unit is used for carrying out abc/dq conversion on three-phase input current of the frequency converter to obtain the instantaneous active current and the instantaneous reactive current;
and the low-pass filtering unit is used for filtering the instantaneous active current and the instantaneous reactive current to obtain a fundamental component of the instantaneous active current and a fundamental component of the instantaneous reactive current.
Optionally, the circuit further includes:
and the phase-locked loop module is respectively connected with the transformation module and the transformation unit in the fundamental wave acquisition module and is used for performing phase locking processing on phase voltage of a power grid to obtain a sine signal and a cosine signal and outputting the obtained sine signal and cosine signal to the transformation module and the transformation unit.
Optionally, the control signal generating module includes:
the difference making unit is used for making a difference between each phase current in the three-phase current output by the second operation module and the same-phase current in the three-phase current output by the integrated device, and outputting the obtained difference value;
and the control unit is used for carrying out triangular carrier linear control on each difference value output by the difference making unit to generate the three-phase switching signal.
Optionally, the value range of the first preset value is as follows:
2.45U1≤K1≤UC1max
wherein, K1Is the first preset value, U1Is the effective value, U, of the voltage of the side phase of the frequency converter power gridC1maxThe maximum voltage value of the first energy storage capacitor is obtained.
Optionally, the value range of the second preset value is as follows:
K1≤K2≤UC2max
wherein, K1Is the first preset value, K2Is the second preset value, UC2maxThe maximum voltage value of the second energy storage capacitor is obtained.
In a second aspect, the present invention provides a control method comprising:
comparing the voltage of the first energy storage capacitor with a first preset value, and generating a logic value according to a comparison result; when the voltage of the first energy storage capacitor is smaller than or equal to the first preset value, the logic value is 1, otherwise, the logic value is 0; the first energy storage capacitor is an energy storage capacitor of a frequency converter connected with the integrated device;
according to the three-phase input current of the frequency converter, acquiring a fundamental component of instantaneous active current and a fundamental component of instantaneous reactive current of the frequency converter;
the voltage of the second energy storage capacitor is subtracted from the second preset value, and PI operation is carried out on the obtained difference value to obtain a current regulating quantity; the second energy storage capacitor is an energy storage capacitor in the integrated device;
multiplying the fundamental component of the instantaneous active current, the fundamental component of the instantaneous reactive current and the three-phase input current of the frequency converter by the generated logic values respectively to obtain corresponding product values, and accumulating the product values corresponding to the fundamental component of the instantaneous active current and the current regulating quantity to obtain accumulated values;
carrying out dq/abc conversion on the accumulated value and a product value corresponding to the fundamental component of the instantaneous reactive current to obtain three-phase current;
subtracting each product value in the product values corresponding to the three-phase input current of the frequency converter from the same-phase current in the three-phase current obtained after dq/abc conversion to obtain a three-phase difference value current;
and generating a three-phase switching signal for controlling a three-phase IGBT bridge arm in the integrated device according to the three-phase current output by the integrated device and the three-phase difference current.
Optionally, the obtaining of the fundamental component of the instantaneous active current and the fundamental component of the instantaneous reactive current of the frequency converter according to the three-phase input current of the frequency converter includes:
carrying out abc/dq conversion on three-phase input current of the frequency converter to obtain instantaneous active current and instantaneous reactive current;
and filtering the instantaneous active current and the instantaneous reactive current to obtain a fundamental component of the instantaneous active current and a fundamental component of the instantaneous reactive current.
Optionally, the method further includes:
and carrying out phase-locking processing on phase voltage of the power grid to obtain a sine signal and a cosine signal, wherein the sine signal and the cosine signal are used in the dq/abc conversion and the abc/dq conversion processes.
Optionally, the generating a three-phase switching signal for controlling a three-phase IGBT bridge arm in the integration apparatus according to the three-phase current output by the integration apparatus and the three-phase difference current includes:
each phase current in the three-phase difference value current is differenced with the same-phase current in the three-phase current output by the integrated device, and the obtained difference values are subjected to triangular carrier linear control to generate the three-phase switching signal
In the control circuit and the control method provided by the invention, when the logic value is 1, the generated three-phase switching signal controls the three-phase IGBT bridge arm in the integrated device, namely, the active filtering function of the integrated device can be controlled, so that harmonic waves are suppressed. When the logic value is 0, the biochemical three-phase switching signal controls a three-phase IGBT bridge arm in the integrated device, namely the energy feedback function of the integrated device can be controlled, and therefore the waste of electric energy is reduced. Therefore, the invention realizes the switching of the active filter control function and the energy feedback control function of the integrated device by using the logical value generated by the comparison unit, can reduce the overall control complexity and greatly reduce the workload of programming.
Drawings
The characteristic information and advantages of the invention will be more clearly understood by reference to the accompanying drawings, which are schematic and should not be understood as imposing any limitation on the invention, in which:
FIG. 1 shows a schematic connection diagram of an energy-feed and filtering integrated device, a frequency converter and a power grid;
FIG. 2 is a block diagram of an embodiment of a control circuit of the integrated feed-filter apparatus according to the present invention;
FIG. 3 is a graph showing a grid current waveform before the control circuit provided by the present invention is used to control a feed-filter integrated device;
FIG. 4 is a graph showing a grid current waveform after control of a feed-filter integrated device by a control circuit provided by the present invention;
fig. 5 shows a waveform diagram of output current and grid voltage when the energy feedback and filtering integrated device works in a unit power factor energy feedback state.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
The invention provides a control circuit of an energy-fed filtering integrated device, as shown in fig. 2, the control circuit comprises:
a comparison module for comparing the voltage U of the first energy storage capacitorC1With a first predetermined value K1Comparing and generating a logic value m according to a comparison result; voltage U in the first energy storage capacitorC1Less than or equal to the first preset value K1If so, the logical value m is 1, otherwise, the logical value m is 0; wherein: the first energy storage capacitor is an energy storage capacitor of a frequency converter connected with the integrated device; the storage capacitor is denoted by C1 in fig. 1;
a fundamental wave acquisition module for acquiring a three-phase input current i according to the frequency convertera、ib、icObtaining a fundamental wave component i 'of the instantaneous active current of the frequency converter'pAnd the fundamental component i 'of the instantaneous reactive current'q；
A first operation module for calculating a second preset value K2Voltage U of second energy storage capacitorC2Making a difference, and performing PI operation on the difference to obtain a current regulating quantity delta ip(ii) a Is also used for converting the fundamental component i 'of the instantaneous active current'pThe fundamental component i 'of the instantaneous reactive current'qAnd of said frequency converterThree-phase input current ia、ib、icRespectively multiplied by the logical value m generated by the comparison module to obtain corresponding product values
i″q、i′a、i′b、i′cAnd converting the fundamental component i 'of the instantaneous active current'pCorresponding product valueAnd the current regulation amount delta ipAccumulating and adding the obtained accumulated value i ″)pAnd the other four product values i' except the product value corresponding to the fundamental wave component of the instantaneous active currentq、i′a、i′b、i′cOutputting; the second energy storage capacitor is an energy storage capacitor C2 in the integrated device;
a transformation module for accumulating the accumulated value i ″' in the output of the first operation modulepAnd a product value i' corresponding to the fundamental component of the instantaneous reactive currentqCarrying out dq/abc conversion to obtain three-phase current iaf、ibf、icfAnd apply three-phase current iaf、ibf、icfOutputting;
a second operation module, configured to calculate a product value i 'corresponding to a three-phase input current of the frequency converter in an output quantity of the first operation module'a、i′b、i′cEach multiplied value of the three-phase current i and the three-phase current i output by the conversion moduleaf、ibf、icfThe same phase current in (1) is differentiated, and each phase current obtained by differentiating is subjected to
Outputting;
a control signal generation module for generating a three-phase current i according to the three-phase current output by the integrated deviceai、ibi、iciAnd the three-phase current output by the second operation moduleGenerating a three-phase switching signal S for controlling a three-phase IGBT bridge arm in the integration apparatusa、Sb、Sc。
It should be understood that when the logical value m is 1, i'p、i′q、ia、ib、icMultiplied by 1, remains unchanged, and is therefore
i″q＝i′q、i′a＝ia、i′b＝ib、i′c＝ic. When the current is regulated by an amount Δ ipFundamental component i 'superimposed to the instantaneous active current'pCorresponding product valueAfter the step of the process is finished,
i″p、i″qthree-phase current i obtained after dq/abc conversionaf、ibf、icfSince the dc-side voltage of the integrated device can be kept stable by including only the fundamental wave, the product value i 'corresponding to the three-phase input current of the inverter is the output value of the first arithmetic module'a、i′b、i′cAnd three-phase current iaf、ibf、icfAfter the difference is made, a three-phase current capable of keeping the direct-current side voltage of the integrated device stable is obtained
The three-phase current
I.e. harmonic currents. Then three-phase current i output by the integrated deviceai、ibi、iciAs a feedback quantity, according to the three-phase current iai、ibi、iciAnd three-phase current
Generating a three-phase switching signal Sa、Sb、Sc. Then using the three-phase switching signal Sa、Sb、ScThe three-phase IGBT bridge arm in the integrated device is controlled, so that the active filtering function of the integrated device can be controlled, and the function of effectively reducing power grid harmonic waves is realized.
It should be understood that when the logical value m is 0, i'p、i′q、ia、ib、icAll 0 after multiplication with 0, i.e.i″q＝0、i′a＝0、i′b＝0、i′c0. When the current is regulated by an amount Δ ipFundamental component i 'superimposed to the instantaneous active current'pCorresponding product value
After the step of the process is finished,
wherein, i ″)p＝ΔipAims to control the voltage stability, i ″, of the direct current side of the integrated deviceqThe purpose of 0 is to make the current output by the integrated device contain no reactive component, i.e. to ensure energy feedback with a specific power factor. Therefore, will i ″)p、i″qThree-phase current i obtained after dq/abc conversionaf、ibf、icfThe unit power factor feedback energy can be controlled, and the voltage stability of the direct current side of the integrated device can be kept. Then three-phase current i output by the integrated deviceai、ibi、iciAs a feedback quantity, according to the three-phase current iai、ibi、iciAnd three-phase current
Generating a three-phase switching signal Sa、Sb、Sc. Using three-phase switching signals Sa、Sb、ScThe three-phase IGBT bridge arm in the integrated device is controlled, namely the energy feedback function of the integrated device can be controlled, and therefore waste of electric energy is reduced.
It can be seen that when the logical value is 1, the generated three-phase switching signal controls the three-phase IGBT bridge arm in the integration device, i.e., the active filter function of the integration device can be controlled, thereby suppressing harmonics. When the logic value is 0, the biochemical three-phase switching signal controls a three-phase IGBT bridge arm in the integrated device, namely the energy feedback function of the integrated device can be controlled, and therefore the waste of electric energy is reduced. The invention realizes the switching of the active filter control function and the energy feedback control function of the integrated device by using the logical value generated by the comparison unit, can reduce the overall control complexity and greatly reduce the workload of programming.
In a specific implementation, the fundamental wave obtaining module may include:
a conversion unit for three-phase input current i to the frequency convertera、ib、icPerforming abc/dq conversion to obtain the instantaneous active current ipAnd the instantaneous reactive current iq；
A low-pass filtering unit for filtering the instantaneous active current ipAnd the instantaneous reactive current iqFiltering to obtain the instantaneous active current ipFundamental wave component i'pAnd the instantaneous reactive current iqFundamental wave component i'q。
In a specific implementation, the control circuit may further include:
and the phase-locked loop module is respectively connected with the transformation module and the transformation unit in the fundamental wave acquisition module and is used for performing phase locking processing on phase voltage of a power grid to obtain a sine signal and a cosine signal and outputting the obtained sine signal and cosine signal to the transformation module and the transformation unit.
It should be understood that when the dq/abc conversion is performed by the conversion module and when the abc/dq conversion is performed by the conversion unit, the phase angle calculation needs to be performed according to the sine signal and the cosine signal, and the sine signal and the cosine signal are generated by using the phase voltage of the power grid, for example, the a-phase voltage of the connection point of the power grid and the integrated device.
In a specific implementation, the control signal generating module includes:
a difference making unit for making the three-phase current output by the second operation module
Each phase current of the integrated device and three-phase current i output by the integrated deviceai、ibi、iciThe same phase current in (1) is differenced, and the obtained difference value i is obtainedca、icb、iccOutputting;
a control unit for calculating the difference values i output by the difference calculating unitca、icb、iccPerforming triangular carrier linear control to generate the three-phase switching signal Sa、Sb、Sc。
Wherein, as shown in fig. 2, the control unit can use the PWM generator to generate the three-phase switching signal S according to the triangular carrier wavea、Sb、Sc。
In specific implementation, the value range of the first preset value may be:
2.45U1≤K1≤UC1max
wherein, K1Is the first preset value, U1Is the effective value, U, of the voltage of the side phase of the frequency converter power gridC1maxThe maximum voltage value of the first energy storage capacitor is obtained.
In specific implementation, the value range of the second preset value may be:
K1≤K2≤UC2max
wherein, K1Is the first preset value, K2Is the second preset value, UC2maxThe maximum voltage value of the second energy storage capacitor is obtained.
A simulation model of the circuit shown in the figure 1 is built through MATLAB software, and the function of the feed-forward filtering integrated device is verified:
first, the control circuit shown in fig. 2 is used to control the up stroke of the pumping unit.
Fig. 3 is a waveform diagram of a power grid current before the control circuit provided by the present invention is used for controlling the feed-filter integrated device, and the harmonic distortion rate of the power grid shown in fig. 3 is 16.27%. Fig. 4 is a waveform diagram of a power grid current after the control circuit provided by the present invention is used to control the feed-filter integrated device, and the harmonic distortion rate of the power grid shown in fig. 4 is 2.57%, thereby verifying the active filter function of the feed-filter integrated device when the control circuit provided by the present invention controls the feed-filter integrated device.
The control circuit shown in fig. 2 is then used to control the down stroke of the pumping unit.
Fig. 5 is a waveform diagram of the output current and the grid voltage when the energy feedback and filtering integrated device works in a unit power factor energy feedback state. When the energy-feedback filtering integrated device works, the phase angle difference between three-phase voltage of a power grid and three-phase current output by the energy-feedback filtering integrated device is 180 degrees, and the energy can be fed back to the power grid by the energy-feedback filtering integrated device with a unit power factor. Therefore, the energy feedback function of the energy feedback and filtering integrated device is verified when the control circuit provided by the invention controls the energy feedback and filtering integrated device. In fig. 5, the higher amplitude is a voltage waveform, and the lower amplitude is a current waveform.
Based on the same inventive concept, the invention also provides a control method of the energy feed and filter integrated device, which comprises the following steps:
comparing the voltage of the first energy storage capacitor with a first preset value, and generating a logic value according to a comparison result; when the voltage of the first energy storage capacitor is smaller than or equal to the first preset value, the logic value is 1, otherwise, the logic value is 0; the first energy storage capacitor is an energy storage capacitor of a frequency converter connected with the integrated device;
according to the three-phase input current of the frequency converter, acquiring a fundamental component of instantaneous active current and a fundamental component of instantaneous reactive current of the frequency converter;
the voltage of the second energy storage capacitor is subtracted from the second preset value, and PI operation is carried out on the obtained difference value to obtain a current regulating quantity;
multiplying the fundamental component of the instantaneous active current, the fundamental component of the instantaneous reactive current and the three-phase input current of the frequency converter by the generated logic values respectively to obtain corresponding product values, and accumulating the product values corresponding to the fundamental component of the instantaneous active current and the current regulating quantity to obtain accumulated values; the second energy storage capacitor is an energy storage capacitor in the integrated device;
carrying out dq/abc conversion on the accumulated value and a product value corresponding to the fundamental component of the instantaneous reactive current to obtain three-phase current;
subtracting each product value in the product values corresponding to the three-phase input current of the frequency converter from the same-phase current in the three-phase current obtained after dq/abc conversion to obtain a three-phase difference value current;
and generating a three-phase switching signal for controlling a three-phase IGBT bridge arm in the integrated device according to the three-phase current output by the integrated device and the three-phase difference current.
Optionally, the obtaining of the fundamental component of the instantaneous active current and the fundamental component of the instantaneous reactive current of the frequency converter according to the three-phase input current of the frequency converter includes:
carrying out abc/dq conversion on three-phase input current of the frequency converter to obtain instantaneous active current and instantaneous reactive current;
and filtering the instantaneous active current and the instantaneous reactive current to obtain a fundamental component of the instantaneous active current and a fundamental component of the instantaneous reactive current.
Optionally, the method further includes:
and carrying out phase-locking processing on phase voltage of the power grid to obtain a sine signal and a cosine signal, wherein the sine signal and the cosine signal are used in the dq/abc conversion and the abc/dq conversion processes.
Optionally, the generating a three-phase switching signal for controlling a three-phase IGBT bridge arm in the integration apparatus according to the three-phase current output by the integration apparatus and the three-phase difference current includes:
and subtracting each phase current in the three-phase difference value current from the same-phase current in the three-phase current output by the integrated device, and performing triangular carrier linear control on each obtained difference value to generate the three-phase switching signal.
In the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The term "plurality" means two or more unless expressly limited otherwise.
Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope defined by the appended claims.
Claims (10)
1. A control circuit of an energy-fed filtering integrated device comprises:
the comparison module is used for comparing the voltage of the first energy storage capacitor with a first preset value and generating a logic value according to a comparison result; when the voltage of the first energy storage capacitor is smaller than or equal to the first preset value, the logic value is 1, otherwise, the logic value is 0; the first energy storage capacitor is an energy storage capacitor of a frequency converter connected with the integrated device;
the fundamental wave acquisition module is used for acquiring a fundamental wave component of instantaneous active current and a fundamental wave component of instantaneous reactive current of the frequency converter according to the three-phase input current of the frequency converter;
the first operation module is used for making a difference between a second preset value and the voltage of the second energy storage capacitor, and performing PI operation on the obtained difference value to obtain a current regulating quantity; the current regulation quantity is also used for multiplying the fundamental component of the instantaneous active current, the fundamental component of the instantaneous reactive current and the three-phase input current of the frequency converter by the logic values generated by the comparison module respectively to obtain corresponding product values, accumulating the product value corresponding to the fundamental component of the instantaneous active current and the current regulation quantity, and outputting the accumulated value and the other four product values except the product value corresponding to the fundamental component of the instantaneous active current; the second energy storage capacitor is an energy storage capacitor in the integrated device;
the conversion module is used for carrying out dq/abc conversion on the accumulated value in the output quantity of the first operation module and a product value corresponding to the fundamental component of the instantaneous reactive current to obtain three-phase current and outputting the three-phase current;
the second operation module is used for making a difference between each product value of product values corresponding to three-phase input current of the frequency converter in the output quantity of the first operation module and in-phase current of the three-phase current output by the conversion module, and outputting each phase current obtained by making the difference;
and the control signal generation module is used for generating a three-phase switching signal for controlling a three-phase IGBT bridge arm in the integrated device according to the three-phase current output by the integrated device and the three-phase current output by the second operation module.
2. The control circuit of the integrated device with energy feed and filter as claimed in claim 1, wherein the fundamental wave obtaining module comprises:
the conversion unit is used for carrying out abc/dq conversion on three-phase input current of the frequency converter to obtain the instantaneous active current and the instantaneous reactive current;
and the low-pass filtering unit is used for filtering the instantaneous active current and the instantaneous reactive current to obtain a fundamental component of the instantaneous active current and a fundamental component of the instantaneous reactive current.
3. The control circuit of the integrated energy-fed filtering device according to claim 2, further comprising:
and the phase-locked loop module is respectively connected with the transformation module and the transformation unit in the fundamental wave acquisition module and is used for performing phase locking processing on phase voltage of a power grid to obtain a sine signal and a cosine signal and outputting the obtained sine signal and cosine signal to the transformation module and the transformation unit.
4. The control circuit of the integrated device with energy feed and filtering as claimed in claim 1, wherein the control signal generating module comprises:
the difference making unit is used for making a difference between each phase current in the three-phase current output by the second operation module and the same-phase current in the three-phase current output by the integrated device, and outputting the obtained difference value;
and the control unit is used for carrying out triangular carrier linear control on each difference value output by the difference making unit to generate the three-phase switching signal.
5. The control circuit of the integrated energy-fed filtering device according to claim 1, wherein the value range of the first preset value is as follows:
2.45U1≤K1≤UC1max
wherein, K1Is the first preset value, U1Is the effective value, U, of the voltage of the side phase of the frequency converter power gridC1maxThe maximum voltage value of the first energy storage capacitor is obtained.
6. The control circuit of the integrated energy-fed filtering device according to claim 1, wherein the second preset value has a value range of:
K1≤K2≤UC2max
wherein, K1Is the first preset value, K2Is the second preset value, UC2maxThe maximum voltage value of the second energy storage capacitor is obtained.
7. A control method of an energy-feed and filtering integrated device comprises the following steps:
comparing the voltage of the first energy storage capacitor with a first preset value, and generating a logic value according to a comparison result; when the voltage of the first energy storage capacitor is smaller than or equal to the first preset value, the logic value is 1, otherwise, the logic value is 0; the first energy storage capacitor is an energy storage capacitor of a frequency converter connected with the integrated device;
according to the three-phase input current of the frequency converter, acquiring a fundamental component of instantaneous active current and a fundamental component of instantaneous reactive current of the frequency converter;
the voltage of the second energy storage capacitor is subtracted from the second preset value, and PI operation is carried out on the obtained difference value to obtain a current regulating quantity; the second energy storage capacitor is an energy storage capacitor in the integrated device;
multiplying the fundamental component of the instantaneous active current, the fundamental component of the instantaneous reactive current and the three-phase input current of the frequency converter by the generated logic values respectively to obtain corresponding product values, and accumulating the product values corresponding to the fundamental component of the instantaneous active current and the current regulating quantity to obtain accumulated values;
carrying out dq/abc conversion on the accumulated value and a product value corresponding to the fundamental component of the instantaneous reactive current to obtain three-phase current;
subtracting each product value in the product values corresponding to the three-phase input current of the frequency converter from the same-phase current in the three-phase current obtained after dq/abc conversion to obtain a three-phase difference value current;
and generating a three-phase switching signal for controlling a three-phase IGBT bridge arm in the integrated device according to the three-phase current output by the integrated device and the three-phase difference current.
8. The method for controlling the integrated energy-feed and filtering device according to claim 7, wherein the obtaining of the fundamental component of the instantaneous active current and the fundamental component of the instantaneous reactive current of the frequency converter according to the three-phase input current of the frequency converter comprises:
carrying out abc/dq conversion on three-phase input current of the frequency converter to obtain instantaneous active current and instantaneous reactive current;
and filtering the instantaneous active current and the instantaneous reactive current to obtain a fundamental component of the instantaneous active current and a fundamental component of the instantaneous reactive current.
9. The control method of the integrated energy-feed and filtering device according to claim 8, further comprising:
and carrying out phase-locking processing on phase voltage of the power grid to obtain a sine signal and a cosine signal, wherein the sine signal and the cosine signal are used in the dq/abc conversion and the abc/dq conversion processes.
10. The method for controlling the energy-fed filtering integrated device according to claim 7, wherein the generating three-phase switching signals for controlling three-phase IGBT bridge arms in the integrated device according to the three-phase currents and the three-phase difference currents output by the integrated device comprises:
and subtracting each phase current in the three-phase difference value current from the same-phase current in the three-phase current output by the integrated device, and performing triangular carrier linear control on each obtained difference value to generate the three-phase switching signal.
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| 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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| 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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