CN102882210A - Active power filter (APF) device based on double vehicle stability control (VSC) interactive parallelly-connected harmonic compensation open loop and closed loop combination - Google Patents
Active power filter (APF) device based on double vehicle stability control (VSC) interactive parallelly-connected harmonic compensation open loop and closed loop combination Download PDFInfo
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Abstract
The invention discloses an active power filter (APF) device based on double vehicle stability control (VSC) interactive parallelly-connected harmonic compensation open loop and closed loop combination. The APF device comprises a main controller and a plurality of parallelly-connected double VSC interactive parallelly-connected power units, wherein the double VSC interactive parallelly-connected power units adopt double VSC interactive parallelly-connected structures and comprise frontward parts (open loop compensation), shared direct current parts and backward parts (closed loop compensation), the shared direct current parts share the capacitors, the frontward parts and the backward parts are respectively and sequentially connected with a grid-tied inductance and a common-mode inductance in serial mode, converge through a frontward group busbar and a backward group busbar respectively, are combined to a grid through a grid-side compensation point and a load-side compensation point, and load current signals between the grid-side compensation point and the load-side compensation point are transmitted to respective double VSC interactive parallelly-connected power units. The APF device effectively maximums output and simultaneously minimizes total output ripples of the whole machine, and effectively restrains zero sequence circulating current between double VSCs, and the whole machine has the dynamic fast response characteristics of open loop compensation and steady-state high accuracy characteristics of closed loop compensation.
Description
Technical field
The present invention relates to a kind of multimachine gradation formula APF (Active PowerFilter, Active Power Filter-APF) device, be specifically related to a kind of based on two VSC (Voltage Source Converter, the voltage-source type current transformer) the multimachine gradation formula APF device of mutual harmonic compensation Open-closed-loop in parallel combination is used for the improvement of the complete active type harmonic wave of low voltage electric network large-capacity and high-performance.
Background technology
Along with being widely used of the nonlinear loads such as power electronic equipment in the low voltage electric network, the low voltage electric network harmonic content increases day by day, has a strong impact on the electrical network quality of power supply.Adopting the complete active-type harmonic control of APF device is current generally acknowledged best harmonic wave management method, but current large capacity and high performance harmonic wave control demand are so that technological difficulties appear in APF.If unit APF will realize large capacity and the output of high-performance harmonic compensation, the high sensibility reciprocal of inductance and DC side high voltage, the large electric current of switching device and high switching frequency need to be incorporated into the power networks, these need current power electronic switching device (IGBT etc.) to be difficult to satisfy simultaneously, so the APF multi-machine parallel connection becomes the main flow direction of the large capacity of current realization and high-performance harmonic wave control.
The APF multi-machine parallel connection realizes that the low-voltage, high-current harmonic compensation has following three kinds of methods at present:
(1) mixed harmonic of APF multi-machine parallel connection+passive filtering group is administered, wherein APF compensates high band time little current harmonics, passive filtering group compensate for low frequency section time high-current harmonic, the shortcoming of this method is: the low-voltage, high-current harmonic compensation mainly is that passive filtering is exerted oneself, not exclusively has advantages of active-type harmonic control, although realized the high performance requirements of the unrealized harmonic wave control of large capacity of harmonic wave control.
(2) the complete active-type harmonic control of the full compensation of APF multimachine, wherein the parallel operation unit module is identical, the full compensation in all parallel operation unit and identical exerting oneself, operational mode identical (open loop or closed loop), the shortcoming of this method is: unit compensates entirely need to higher switching frequency, limited the unit output capacity, thereby large volume output needs too much parallel operation unit, cost improves greatly; Each parallel operation unit all runs on open loop or closed loop compensation pattern, and complete machine can not have the steady high-precision characteristic of dynamic fast response characteristic and the closed loop compensation of open-loop compensation concurrently; When offset current hour, the multimachine unit needs master controller to participate in control could realize that redundant mode moves, automatically redundancy running.
(3) the mutual complete active-type harmonic control in parallel of APF multimachine, all parallel operation units shared dc bus capacitors wherein, each AC output is incorporated into the power networks through multi winding transformer, the shortcoming of this method is: although effectively reduced multi-machine parallel connection DC side passive device, but in order to suppress circulation between multimachine, AC output is incorporated into the power networks after needing to adopt the multi winding transformer isolation again, like this during the large volume output of complete machine, offset current needs to be incorporated into the power networks behind transformer again, causing harmonic wave can compensate frequency range reduces, the compensation effect variation, and this high-power transformer is made difficulty, bulky, can generate heat during operation serious, make machine loss excessive.
In sum, there is in various degree defective in APF multi-machine parallel connection technology at present, requires further improvement.
Summary of the invention
Goal of the invention: for the problem and shortage of above-mentioned prior art existence, the purpose of this invention is to provide a kind of APF device based on the combination of the mutual harmonic compensation Open-closed-loop in parallel of two VSC, making complete machine effectively export total output ripple of maximized while minimizes, complete machine has the steady high-precision characteristic of dynamic fast response characteristic and the closed loop compensation of open-loop compensation concurrently, the unit output capacity need not again to increase DC side passive device or promotes dc voltage when promoting, satisfy the large capacity of electrical network and the requirement of high-performance harmonic wave control.
Technical scheme: for achieving the above object, the technical solution used in the present invention is a kind of APF device based on the combination of the mutual harmonic compensation Open-closed-loop in parallel of two VSC, the mutual power cell in parallel of two VSC (the mutual power cell in parallel of two VSC that comprises master controller and a plurality of parallel connections, also claim " parallel operation unit " or " power cell "), the mutual power cell in parallel of two VSC of described a plurality of parallel connections adopts two mutual parallel-connection structures of VSC, the described pair of mutual power cell in parallel of VSC comprises the forward direction part, be total to direct current component (DC side) and backward part, described altogether direct current component shares electric capacity, forward direction part (running on the open-loop compensation mode) and backward part (running on the closed loop compensation mode) be incorporated into the power networks inductance and common mode inductance (common mode inductance is used for suppressing the zero sequence circulation between couple VSC) of series connection successively respectively, conflux through forward direction group bus and backward group of bus respectively, by net side compensation point and load-side compensation point and to electrical network, the load current signal between net side compensation point and the load-side compensation point is sent into the mutual power cell in parallel of each pair VSC respectively.
Wherein, two VSC DC side share electric capacity, AC (comprise forward direction part and backward part) both-end is gone here and there respectively inductance and the common mode inductance and to electrical network of being incorporated into the power networks, when this structure promotes the unit output capacity, direct current (DC) side passive device need not to increase, the DC direct voltage need not to promote, and the inhibition of the zero sequence circulation between two VSC easily, gets final product establishment by common mode inductance and rational PWM mode; The both-end output of each parallel operation unit is confluxed by two groups of buses respectively, and the double compensation point is incorporated into the power networks, and load current detection CT (current transformer, current transformer) is positioned in the middle of the double compensation point.This structure is divided into the forward direction group of networking side compensation point and backward group of company's load-side compensation point with complete machine, wherein forward direction group harmonic compensation open loop, backward group of harmonic compensation closed loop, thereby complete machine harmonic compensation Open-closed-loop combination, both had a dynamic fast response characteristic of open-loop compensation, have again a steady high-precision characteristic of closed loop compensation, the forward direction group of complete machine and backward group need not special line again in addition or the control system intervention can realize the redundant mode operation automatically; The forward direction of each parallel operation unit or the equal harmonic wave selectivity of backward part gradation compensation, frequency range by institute's offset current is divided into forward direction or each backward designated frequency band subharmonic compensation group, and increase with its frequency and the characteristics that significantly reduce according to electrical network typical case harmonic current effective value, specify low-frequency range subharmonic compensation group low switching frequency, High-current output, specify the compensation of high band subharmonic to organize high switching frequency, the output of little electric current, in the identical designated frequency band subharmonic compensation group, adopt phase-shift PWM to offset the output switch subharmonic simultaneously.This multimachine gradation formula harmonic compensation framework is so that complete machine is effectively exported maximization and total output ripple minimizes, like this in the situation that the identical ripple of output current is constant, the be incorporated into the power networks optional sensibility reciprocal of inductance of parallel operation unit minimizes, thereby unit dynamic property optimization, theoretical maximum output current maximization in the constant situation of direct voltage and line voltage.
Preferably, described forward direction part and backward part all adopt harmonic current gradation compensation, frequency range by institute's offset current is divided into forward direction or each backward designated frequency band subharmonic compensation group, and increase with its frequency and the characteristics that significantly reduce according to electrical network typical case harmonic current effective value, to specify low-frequency range subharmonic compensation group low switching frequency, High-current output, to specify the compensation of high band subharmonic to organize high switching frequency, little electric current output, simultaneously in the identical designated frequency band subharmonic compensation group, adopt phase-shift PWM to offset the switch subharmonic, thereby make complete machine effectively export maximization, total output ripple minimizes.
Preferably, also comprise master controller, the described pair of mutual power cell in parallel of VSC also comprises cell controller, described master controller sends synchronizing signal to each cell controller, the d. c. voltage signal at described cell controller input load current signal, two VSC output current signal, net side line voltage signal and described electric capacity two ends, the pwm signal of the two VSC of output control.
Preferably, described cell controller comprises ring in DC voltage control outer shroud, the forward direction harmonic current gradation control, the interior ring of backward harmonic current gradation control, line voltage PLL module, PWM phase-shifting carrier wave synchronization module, a PWM module and the 2nd PWM module, the deviation signal of the d. c. voltage signal at described DC voltage control outer shroud input direct voltage set-point and described electric capacity two ends, the output of voltage on line side PLL module, the meritorious instruction current of output fundamental positive sequence encircles in ring and the backward harmonic current gradation control in controlling to the gradation of forward direction harmonic current respectively; Line voltage PLL module input line voltage, output line voltage fundamental positive sequence real-time phase; The meritorious instruction current of fundamental positive sequence of the deviation of ring input load current signal and forward direction part output current, the output of DC voltage control outer shroud in the forward direction harmonic current gradation control and the deviation of forward direction part output current, output forward direction part command voltage is again to PWM module output forward direction part PWM driving signal; The meritorious instruction current of fundamental positive sequence of ring input load current signal, the output of DC voltage control outer shroud and the deviation of backward part output current in the backward harmonic current gradation control, export backward part command voltage, again to the backward part PWM driving of the 2nd PWM module output main circuit signal; PWM phase-shifting carrier wave synchronization module receives the synchronizing signal that master controller sends, and sends the phase-shifting carrier wave synchronizing signal to a described PWM module and the 2nd PWM module respectively, realizes phase-shift PWM.
Beneficial effect: the forward direction of (1) parallel operation unit or the equal harmonic wave selectivity of backward part gradation compensation, frequency range by institute's offset current is divided into forward direction or each backward designated frequency band subharmonic compensation group, and increase with its frequency and the characteristics that significantly reduce according to electrical network typical case harmonic current effective value, specify low-frequency range subharmonic compensation group low switching frequency, High-current output, specify the compensation of high band subharmonic to organize high switching frequency, the output of little electric current, in the identical designated frequency band subharmonic compensation group, adopt phase-shift PWM to offset the output switch subharmonic simultaneously.This multimachine gradation formula harmonic compensation framework is so that complete machine is effectively exported maximization and total output ripple minimizes, like this in the situation that the identical ripple of output current is constant, the be incorporated into the power networks optional sensibility reciprocal of inductance of parallel operation unit minimizes, thereby unit dynamic property optimization, theoretical maximum output current maximization in the constant situation of direct voltage and line voltage.
(2) output of the both-end of each parallel operation unit is confluxed by two groups of buses respectively, and the double compensation point is incorporated into the power networks, and load current detection CT is positioned in the middle of the double compensation point.This structure is divided into the forward direction group of networking side compensation point and backward group of company's load-side compensation point with complete machine, wherein forward direction group harmonic compensation open loop, backward group of harmonic compensation closed loop, thereby complete machine harmonic compensation Open-closed-loop combination, both had a dynamic fast response characteristic of open-loop compensation, have again a steady high-precision characteristic of closed loop compensation, the forward direction group of complete machine and backward group need not special line again in addition or the control system intervention can realize the redundant mode operation automatically.
(3) multi-machine parallel connection, parallel operation unit adopt two mutual parallel-connection structures of VSC, and namely two VSC DC side share electric capacity, and the AC both-end is gone here and there respectively inductance and the common mode inductance and to electrical network of being incorporated into the power networks.When this structure promoted the unit output capacity, DC side passive device need not increase, and the DC direct voltage need not to promote, and the inhibition of the zero sequence circulation between two VSC easily, got final product establishment by common mode inductance and rational PWM mode.
Description of drawings
Fig. 1 is machine system structure chart of the present invention;
Fig. 2 is the two mutual power cell structure figure in parallel of VSC of the present invention;
Fig. 3 is machine system operational mode schematic diagram of the present invention;
Fig. 4 is the control strategy block diagram of cell controller of the present invention;
Fig. 5 is machine system harmonic wave control model of the present invention;
Fig. 6 (a) is power cell 1 backward part A phase output current wave figure, Fig. 6 (b) is power cell 2 backward part A phase output current wave figure, Fig. 6 (c) is mutually total output current wave figure of backward group of A, Fig. 6 (d) is power cell 1 forward direction part output current wave figure, Fig. 6 (e) is power cell 2 forward direction part output current wave figure, Fig. 6 (f) is mutually total output current wave figure of forward direction group A, Fig. 6 (g) is complete machine A phase output current wave figure, Fig. 6 (h) is net side A phase current waveform figure, and Fig. 6 (i) is load A phase current waveform figure;
Fig. 7 (a) is respectively Fig. 6 (a) to the fft analysis block diagram of Fig. 6 (f) to Fig. 7 (f), and Fig. 7 (g) is the fft analysis block diagram of Fig. 6 (h), and Fig. 7 (h) is the fft analysis block diagram of Fig. 6 (i);
Fig. 8 (a) is load three-phase current oscillogram, Fig. 8 (b) is the fft analysis figure of Fig. 8 (a), Fig. 8 (c) is power cell 1 backward part output current wave figure (CH1), power cell 2 backward part output current wave figure (CH2) and backward group of total output current wave figure (CH3), Fig. 8 (d) is the total offset current oscillogram of device three-phase, Fig. 8 (e) is A phase current on line side oscillogram (CH2), A phase offset current oscillogram (CH3), A phase load current waveform figure (CH4) and electrical network AB line voltage oscillogram (CH1), Fig. 8 (f) is the details expanded view of Fig. 8 (c), Fig. 8 (g) is the dynamic response oscillogram of complete machine compensation harmonic, wherein CH1 is A current on line side oscillogram, CH2 is A phase offset current oscillogram, CH3 is A phase load current waveform figure, Fig. 8 (h) is net side three-phase current oscillogram, and Fig. 8 (i) is the fft analysis figure of Fig. 8 (h).
Embodiment
Below in conjunction with the drawings and specific embodiments, further illustrate the present invention, should understand these embodiment only is used for explanation the present invention and is not used in and limits the scope of the invention, after having read the present invention, those skilled in the art all fall within the application's claims limited range to the modification of the various equivalent form of values of the present invention.
Machine system structure of the present invention as shown in Figure 1.Complete machine multi-machine parallel connection, parallel operation unit adopt two mutual parallel-connection structures of VSC, and namely two VSC DC side share electric capacity, and the AC both-end is gone here and there respectively inductance and the common mode inductance and to electrical network of being incorporated into the power networks; The output of the both-end of each parallel operation unit is confluxed through two groups of buses respectively, and the double compensation point is incorporated into the power networks, i.e. forward direction group bus and net side compensation point thereof among the figure, backward group of bus and load-side compensation point thereof; Load harmonic current detects CT and is positioned in the middle of the double compensation point its sensed current signal
Send into each cell controller; Each cell controller and complete machine master controller are interconnected by optical fiber or bus communication.Described master controller is the responsible service data that issues synchronizing signal and gather each power cell to each power cell mainly.
The two mutual power cell structure in parallel of VSC of the present invention as shown in Figure 2.Cell controller input load harmonic current detects the CT signal
Two VSC output electric current measure CT signals
Net side line voltage detecting PT signal
And dc voltage detects PT signal (U
Dc), by internal arithmetic, the pwm signal of final output control parallel operation unit main circuit IGBT; The AC both-end series connection of the two VSC of parallel operation unit main circuit is incorporated into the power networks behind inductance and the common mode inductance respectively and to forward direction group bus and backward group of bus, and wherein common mode inductance is used for the zero sequence circulation between the two VSC of effective filtering.
Machine system operational mode of the present invention as shown in Figure 3.The parallel operation unit is divided into forward direction part, altogether direct current component and backward part, and forward direction is partly exported the forward direction group bus that confluxes and is connected to net side compensation point, and the backward part output backward group of bus that conflux is connected to the load-side compensation point, and namely the double-bus double compensation point that confluxes is incorporated into the power networks; Load harmonic current detects CT and is positioned in the middle of the double compensation point its sensed current signal
Send into each parallel operation unit; Complete machine pre-compensation group, harmonic compensation open loop operation; The backward compensation group of complete machine, the harmonic compensation operation with closed ring; According to the offset current frequency range, complete machine power cell 1～N is divided into appointment sub band forward direction (backward) compensation group 1～n, wherein low-frequency compensation group low switching frequency, High-current output and high switching frequency, the output of little electric current are organized in the high band compensation, machine system is effectively exported maximization; Part in similar frequency bands forward direction (backward) the compensation group is divided equally offset current by effective value, and switch time ripple is offset in the phase-shift PWM operation, minimizes total output ripple.
The control strategy block diagram of cell controller of the present invention as shown in Figure 4.Cell controller comprises ring, line voltage PLL module, PWM phase-shifting carrier wave synchronization module, a PWM module and the 2nd PWM module in DC voltage control outer shroud, the forward and backward harmonic current gradation control.DC voltage control outer shroud input direct voltage set-point (U
Dc_ref) and direct voltage (U
Dc) the output of deviation signal, voltage on line side PLL module, the meritorious instruction current of output fundamental positive sequence
Ring to the forward and backward harmonic current gradation control respectively is stabilized in dc capacitor voltage near the set-point; Line voltage PLL module input line voltage
Output line voltage fundamental positive sequence real-time phase
Electric current between ring input double compensation point in the forward direction harmonic current gradation control
With forward direction part output current
The meritorious instruction current of fundamental positive sequence of deviation, DC voltage control outer shroud output
With forward direction part output current
Deviation, output forward direction part command voltage
Again to PWM module output main circuit forward direction part PWM driving signal; Ring is directly inputted electric current between double compensation point in the backward harmonic current gradation control
The meritorious instruction current of the fundamental positive sequence of DC voltage control outer shroud output
With backward part output current
Deviation, export backward part command voltage
Again to the backward part PWM driving of the 2nd PWM module output main circuit signal; PWM phase-shifting carrier wave synchronization module receives the synchronizing signal that master controller sends, and the PWM module carrier phase of forward and backward part realizes phase-shift PWM synchronously.
Figure 5 shows that machine system harmonic wave control model of the present invention, is that double compensation point proposed by the invention is incorporated into the power networks, the control method of Open-closed-loop combination in order better to describe.H
IF(s) (i=l～N) is the equivalent link of forward direction part, H
IB(s) (i=l～N) is backward part equivalence link, Ic
IF(s) (i=l～N) is forward direction part output current, Ic
IB(s) (i=l～N) is backward part output current.Such current on line side
Electric current between double compensation point
With the load-side electric current
Relation as follows:
I
S(s)=I
H(s)[l-H
IF(s)-H
2F(s)-......-H
NF(s)] [2]
Backward loop (Fig. 5 left-half) for harmonic wave control model has consisted of closed loop controlling structure, is input as the load-side electric current
Be output as the double compensation point and ask electric current
Backward link H wherein
IB(s) (i=l～N), it is the backward department pattern in parallel operation unit, to selecting filtering frequency range order harmonic components to have infinite gain, must be exported by formula l and will can not contain these and select filtering frequency range subharmonic, and the harmonic filtration floating, not affected by the non-linear factors such as unit control system sampling element; Forward direction loop (Fig. 5 right half part) for harmonic wave control model has consisted of the open loop control structure, and being input as the output of higher level's closed-loop structure is electric current between double compensation point
Be output as current on line side
Forward direction link H wherein
IF(s) (i=l～N), it is parallel operation unit forward direction department pattern, to selecting the gain of filtering frequency range order harmonic components to be l (plural number), must be exported by formula l and will not contain these and select filtering frequency range subharmonic, and has a fast-response energy, do not need master controller to participate in directly can to realize the automatic redundancy running of forward direction group, backward group of harmonic compensation, but this harmonic filtration is open loop approach, is easy to be subjected to the non-linear factors such as unit control system sampling element to affect; The combination of complete machine harmonic wave Open-closed-loop, formula 3 is its harmonic wave control model tormulation formula.
Apparatus of the present invention harmonic compensation simulation result is shown in Fig. 6,7.Two groups of two mutual power cells in parallel of VSC (power cell l and power cell 2) are adopted in emulation, backward group of compensation 5,7 subharmonic of every group of power cell, the compensation 11,13 of forward direction group and high order harmonic component.Fig. 6 (a) is mutually output current wave and fft analysis block diagram of the backward part A of power cell l with Fig. 7 (a), 5,7 subharmonic of compensation 50%, and the PWM carrier phase is 0 °; Fig. 6 (b) is mutually output current wave and fft analysis block diagrams of power cell 2 backward part A with Fig. 7 (b), 5,7 subharmonic of compensation 50%, 180 ° of PWM phase-shifting carrier wave positions; Fig. 6 (c) is mutually total output current wave and fft analysis block diagram of backward group of A with Fig. 7 (c); Fig. 6 (d) and Fig. 7 (d) are power cell 1 forward direction part output current wave and fft analysis block diagram, 11,13 and high order harmonic component of compensation 50%, 90 ° of PWM phase-shifting carrier wave positions; Fig. 6 (e) and Fig. 7 (e) are power cell 2 forward direction part output current waves and fft analysis block diagram, 11,13 subharmonic of compensation 50%, 270 ° of PWM phase-shifting carrier wave positions; Fig. 6 (f) is mutually total output current wave and fft analysis block diagram of forward direction group A with Fig. 7 (f); Fig. 6 (g) is complete machine A phase output current wave figure; Fig. 6 (h) and Fig. 7 (g) are net side A phase current waveform and fft analysis block diagram; Fig. 6 (i) and Fig. 7 (h) are load A phase current waveform and fft analysis block diagram.Comparison diagram 7 (c) and (a), (b) can find out, adopts the switch time ripple that phase-shifting carrier wave 180 degree modulation can establishment output offset current; In like manner visible Fig. 7 (f) and (d), (e).Can find out from compensating rear current on line side simulation waveform, apparatus of the present invention have effectively compensated the nonlinear load harmonic current.Among Fig. 6, (a)～(i) abscissa is identical; Among Fig. 7, (a)～(g) abscissa is identical.
Apparatus of the present invention harmonic compensation experimental waveform as shown in Figure 8.Two groups of two mutual power cells in parallel of VSC (power cell 1 and power cell 2) of experiment employing, backward group of compensation 5,7 subharmonic of every group of power cell, the compensation 11,13 of forward direction group and high order harmonic component, mutually on the same group interior 50% current-sharing.Fig. 8 (a) is load three-phase current waveform, and Fig. 8 (b) is its fft analysis, and this load is typical three-phase six arteries and veins rectification loads, and electric current THD is 28.5%; Fig. 8 (d) is the total offset current waveform of device three-phase; Fig. 8 (h) is net side three-phase current waveform, and Fig. 8 (i) is its fft analysis, and power network current THD is 2.5% only after the visible compensation, has obtained good harmonic wave control effect; Fig. 8 (e) is A phase current on line side (CH2), A phase offset current (CH3), A phase load electric current (CH4) and electrical network AB line voltage (CH1), can be found out the load current waveform process device output current compensation of distortion by waveform after, power network current is substantially sinusoidal; Fig. 8 (c) is power cell 1 backward part output current (CH1), power cell 2 backward part output currents (CH2) and backward group of total output current (CH3), Fig. 8 (f) is that the details of Fig. 8 (c) is launched, can find out that two parts output ripple offsets, total output current wave ripple is very little; Fig. 8 (g) is the dynamic response waveform of complete machine compensation harmonic, wherein CH1 is that A current on line side, CH2 are that A phase offset current, CH3 are A phase load current waveform, after load changing can be found out, high-precisionly when device is followed the tracks of fast compensated harmonic current in the load.
Claims (4)
1. APF device based on the combination of the mutual harmonic compensation Open-closed-loop in parallel of two VSC, the mutual power cell in parallel of two VSC that comprises master controller and a plurality of parallel connections, the mutual power cell in parallel of two VSC of described a plurality of parallel connections adopts two mutual parallel-connection structures of VSC, the described pair of mutual power cell in parallel of VSC comprises the forward direction part, be total to direct current component and backward part, described altogether direct current component shares electric capacity, forward direction part and backward part inductance and the common mode inductance of being incorporated into the power networks of connecting successively respectively, conflux through forward direction group bus and backward group of bus respectively, by net side compensation point and load-side compensation point and to electrical network, the load current signal between net side compensation point and the load-side compensation point is sent into the mutual power cell in parallel of each pair VSC respectively.
2. described APF device based on the combination of the mutual harmonic compensation Open-closed-loop in parallel of two VSC according to claim 1, it is characterized in that: described forward direction part and backward part all adopt harmonic current gradation compensation, frequency range by institute's offset current is divided into forward direction or each backward designated frequency band subharmonic compensation group, to specify low-frequency range subharmonic compensation group low switching frequency, High-current output, to specify the compensation of high band subharmonic to organize high switching frequency, the output of little electric current, in the identical designated frequency band subharmonic compensation group, adopt phase-shift PWM to offset the switch subharmonic simultaneously.
3. described APF device based on the combination of the mutual harmonic compensation Open-closed-loop in parallel of two VSC according to claim 1, it is characterized in that: also comprise master controller, the described pair of mutual power cell in parallel of VSC also comprises cell controller, described master controller sends synchronizing signal to each cell controller, the d. c. voltage signal at described cell controller input load current signal, two VSC output current signal, net side line voltage signal and described electric capacity two ends, the pwm signal of the two VSC of output control.
4. described APF device based on the combination of the mutual harmonic compensation Open-closed-loop in parallel of two VSC according to claim 3, it is characterized in that: described cell controller comprises the DC voltage control outer shroud, ring in the forward direction harmonic current gradation control, ring in the backward harmonic current gradation control, line voltage PLL module, PWM phase-shifting carrier wave synchronization module, the one PWM module and the 2nd PWM module, the deviation signal of the d. c. voltage signal at described DC voltage control outer shroud input direct voltage set-point and described electric capacity two ends, the output of voltage on line side PLL module, the meritorious instruction current of output fundamental positive sequence encircles in ring and the backward harmonic current gradation control in controlling to the gradation of forward direction harmonic current respectively; Line voltage PLL module input line voltage, output line voltage fundamental positive sequence real-time phase; The meritorious instruction current of fundamental positive sequence of the deviation of ring input load current signal and forward direction part output current, the output of DC voltage control outer shroud in the forward direction harmonic current gradation control and the deviation of forward direction part output current, output forward direction part command voltage is again to PWM module output forward direction part PWM driving signal; The meritorious instruction current of fundamental positive sequence of ring input load current signal, the output of DC voltage control outer shroud and the deviation of backward part output current in the backward harmonic current gradation control, export backward part command voltage, again to the backward part PWM driving of the 2nd PWM module output main circuit signal; PWM phase-shifting carrier wave synchronization module receives the synchronizing signal that master controller sends, and sends the phase-shifting carrier wave synchronizing signal to a described PWM module and the 2nd PWM module respectively.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN108110760A (en) * | 2018-01-11 | 2018-06-01 | 中国石油大学(华东) | A kind of meter and the micro-grid system harmonic wave control method for coordinating of mains by harmonics and load harmonic |
| CN108493938A (en) * | 2018-04-26 | 2018-09-04 | 河南森源电气股份有限公司 | A kind of control method and device of parallel-connection type active power filter |
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| CN115333502A (en) * | 2022-10-13 | 2022-11-11 | 湖北工业大学 | Multistage parallel active common mode interference filter and control method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103872685A (en) * | 2014-03-11 | 2014-06-18 | 韩伟 | Harmonic current fractional frequency staggered compensation device and harmonic current fractional frequency giving algorithm thereof |
| CN103872685B (en) * | 2014-03-11 | 2016-06-01 | 韩伟 | The staggered compensation system of a kind of harmonic current frequency division and harmonic current thereof divide frequency given algorithm |
| CN110809843A (en) * | 2017-05-09 | 2020-02-18 | 开利公司 | Active harmonic compensator for variable speed chiller |
| CN108110760A (en) * | 2018-01-11 | 2018-06-01 | 中国石油大学(华东) | A kind of meter and the micro-grid system harmonic wave control method for coordinating of mains by harmonics and load harmonic |
| CN108110760B (en) * | 2018-01-11 | 2020-09-15 | 中国石油大学(华东) | Micro-grid system harmonic coordination control method considering power grid harmonic waves and load harmonic waves |
| CN108493938A (en) * | 2018-04-26 | 2018-09-04 | 河南森源电气股份有限公司 | A kind of control method and device of parallel-connection type active power filter |
| CN115333502A (en) * | 2022-10-13 | 2022-11-11 | 湖北工业大学 | Multistage parallel active common mode interference filter and control method |
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