CN203707776U - Three-phase four-wire system active power filter based on capacitor midpoint topology - Google Patents
Three-phase four-wire system active power filter based on capacitor midpoint topology Download PDFInfo
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- CN203707776U CN203707776U CN201320867572.0U CN201320867572U CN203707776U CN 203707776 U CN203707776 U CN 203707776U CN 201320867572 U CN201320867572 U CN 201320867572U CN 203707776 U CN203707776 U CN 203707776U
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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
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- 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
- Y02E40/20—Active power filtering [APF]
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Abstract
The utility model provides a three-phase four-wire system active power filter based on capacitor midpoint topology, and is suitable to be used in three-phase four-wire system zero sequence current compensation occasions. A capacitor midpoint topological structure is used, providing channels for compensating current in a middle wire. The active power filter has reliable zero sequence current compensation ability. The active power filter comprises a main circuit and a control circuit used to control the main circuit. The main circuit comprises a power converting unit of the capacitor midpoint type distributed topological structure. The capacitor midpoint type distributed topological structure comprises a DC side capacitor group and a capacitor group positive and negative busbar, a first voltage transformer, a second voltage transformer, a first equalizing resistor, and a second equalizing resistor. The DC side capacitor group comprises a plurality of midpoint type distributed power capacitors. The midpoint type distributed power capacitors are connected with the capacitor group positive and negative busbar. A middle wire is led out from the midpoint of the capacitor group, and the middle wire is connected with a neutral line of a three-phase power supply.
Description
Technical field
The utility model belongs to low-voltage active electric power filter field, relates in particular to a kind of active power filter for three-phase four-wire system based on Pointwise Topology in electric capacity.
Background technology
Harmonic wave is the important indicator of the quality of power supply.In the time that sine voltage is applied on nonlinear load circuit, electric current just becomes non-sinusoidal waveform, and non-sinusoidal waveform electric current produces pressure drop on electric network impedance, can make voltage waveform also become non-sinusoidal waveform.Along with the continuous increase of power electronic equipment in electrical network, cause serious electric network pollution.This is mainly because non-linear, the impact of these loads and unbalancedly cause by electrical characteristics.Therefore the active power filtering technology, suppressing for harmonic wave has become one of study hotspot of power electronics and electrical field.Active Power Filter-APF (Active Power Filter-APF) is a kind of for dynamically suppressing the novel electric power electric device of harmonic wave, compensating reactive power, the harmonic wave that it can all change big or small and frequency and dynamic idle compensating.Active Power Filter-APF has capacitance group, converter and linked reactor to form conventionally, is in fact equivalent to controlled current source, and the current-order sending in real time according to controller produces corresponding offset current, thus harmonic carcellation.At present, the multiplex Three-phase Three-wire Active Power Filter in market, cannot be applicable to the occasion of the zero-sequence current compensation of three-phase four-wire system.But actual application places exists numerous zero-sequence currents to flow through the neutral line, cause the neutral line seriously to generate heat and cause accident.
Utility model content
The deficiency existing for prior art, the utility model provides a kind of active power filter for three-phase four-wire system based on Pointwise Topology in electric capacity, be applicable to the occasion of the zero-sequence current compensation of three-phase four-wire system, this filter is connected in parallel between electrical network and load, to the output electric current reverse with harmonic wave in the three-phase and four-line on electrical network, the harmonic current producing with nonlinear load on electrical network offsets, and reaches the object of harmonic wave on filtering electrical network.
The technical solution of the utility model:
A kind of active power filter for three-phase four-wire system based on Pointwise Topology in electric capacity, comprise main circuit and for controlling the control circuit of main circuit, it is characterized in that, described main circuit comprises the power conversion unit with point type distributed topology structure in electric capacity, in described electric capacity, point type distributed topology structure comprises DC bus capacitor group and the positive and negative busbar of capacitance group and the first voltage transformer, second voltage instrument transformer, the first grading resistor, the second grading resistor, described DC bus capacitor group comprises the power capacitor that some middle point types distribute, the power capacitor that described middle point type distributes is connected on the positive and negative busbar of capacitance group, drawing center line from the mid point of described capacitance group is connected with the neutral line of three phase mains, described the first voltage transformer and the first grading resistor are connected in parallel between described capacitance group mid point and the positive busbar of capacitance group, and described second voltage instrument transformer and the second grading resistor are connected in parallel between described capacitance group mid point and the positive and negative busbar of capacitance group, six electronic switching devices of described power conversion unit form three-phase half-bridge PWM electronic switching circuit, its positive-negative input end connects respectively the positive and negative busbar of capacitance group, the three-phase output line of drawing from the mid point of three-phase half-bridge has centre path current and detects instrument transformer, and described three-phase output line is connected A phase line, B phase line and the C phase line of three phase mains successively with main circuit breaker by reactor module, fuse, A.C. contactor.
Three contacts of described A.C. contactor one end are connected with A phase line, B phase line, C phase line on three-phase four-wire system electrical network respectively, and three contacts of the other end are connected with fuse FU1, FU2, FU3 respectively; The two ends of three contacts of described A.C. contactor are parallel with respectively the first charging resistor R1, the second charging resistor R2, the 3rd charging resistor R3; Described the first charging resistor R1 is connected in parallel on the two ends, contact that are connected with A phase line, and described the second charging resistor R2 is connected in parallel on the two ends, contact that are connected with B phase line, and described the 3rd charging resistor R3 is connected in parallel on the two ends, contact that are connected with C phase line.
Described reactor module comprises three reactors, is respectively the first reactor L1, the second reactor L2 and the 3rd reactor L3; One end of described the first reactor L1, the second reactor L2 and the 3rd reactor L3 is connected respectively the three-phase output line of power conversion unit, and the other end is electrically connected with fuse FU1, FU2, FU3 respectively.
Six electronic switching devices of described power conversion unit are selected six IGBT unit composition integrated circuit modules.
Described main circuit also comprises filter branch, the characteristic frequency of setting for Active Power Filter-APF control circuit described in filtering, and 3. one end of described filter branch and described reactor module are electrically connected, and the other end is connected with the neutral line of three phase mains respectively.
Described filter branch filtering device identical by three groups and that be connected in parallel forms, every group of filtering device is made up of capacitor of a resistor in series, capacitor in three groups of filtering devices is corresponding and the first reactor L1 respectively, the second reactor L2 is connected with the 3rd reactor L3, and the resistor in three groups of filtering devices connects the neutral line of three phase mains.
Described control circuit comprises DSP digital signal processing unit and FPGA field programmable gate array unit, carry out analyzing and processing for the phase line current signal that the current transformer of the nonlinear load end receiving is transmitted, the control signal that the electronic switching device of output power ratio control converter unit is opened or turn-offed.
Technique effect of the present utility model:
The utility model provides a kind of active power filter for three-phase four-wire system (being called for short APF) based on Pointwise Topology in electric capacity, this filter is connected in parallel between electrical network and load, to output in the three-phase and four-line on electrical network with the contrary electric current of harmonic direction, the harmonic current producing with nonlinear load on electrical network offsets, and reaches the object of harmonic wave on filtering electrical network.The utility model comprises the power conversion unit with point type distributed topology structure in electric capacity, adopt point type topological structure in electric capacity for current in middle wire, for compensation current in middle wire provides passage, and carry out in good time dynamic compensation, there is reliable zero-sequence current compensation ability; In the utility model employing electric capacity, point type is distributed as device provides neutral line level, adopts the parallel connection of multimode group, reduces fully parasitic capacitance, reduces ripple current; For DC side provides multiple DC voltage control, multiple voltage control vector is superimposed makes whole DC voltage more stable simultaneously, and ripple ability is stronger; Meanwhile, the control system of passing through that in the utility model electric capacity, point type distribution can be real-time is controlled apportion capacitance voltage, and it is all pressed and reaches poised state realization more rapidly reliably.
Accompanying drawing explanation
Fig. 1 is electrical block diagram of the present utility model.
Reference numeral lists as follows:
R1-the first charging resistor, R2-the second charging resistor, R3-the 3rd charging resistor, R4-the first grading resistor, R5-the second grading resistor, QF1-main circuit breaker,
Six electronic switching devices of 1.-power conversion unit 2.-power conversion cell capacitance in point type distribute topological structure
3.-reactor module, L1-the first reactor, L2-the second reactor, L3-the 3rd reactor
4.-A.C. contactor KM1,5.-filter branch, 6-fuse,
PT1_Udc-the first voltage transformer, PT2_Udc-second voltage instrument transformer,
CT_IB-the first current detecting instrument transformer,
CT_IS-the second current transformer (being the current transformer of the network system of access user),
CT_IL-the 3rd current transformer (being the current transformer of nonlinear load end).
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is further elaborated.
Fig. 1 is circuit connection diagram of the present utility model.The utility model provides a kind of active power filter for three-phase four-wire system (being called for short APF) based on Pointwise Topology in electric capacity, this filter is connected in parallel between electrical network and load, to the output electric current reverse with harmonic wave in the three-phase and four-line on electrical network, the harmonic current producing with nonlinear load on electrical network offsets, and reaches the object of harmonic wave on filtering electrical network.
As shown in 1 figure, a kind of active power filter for three-phase four-wire system based on Pointwise Topology in electric capacity of the utility model, comprise main circuit and for controlling the control circuit of main circuit, main circuit comprises having point type distributed topology structure power conversion unit 2. in electric capacity, in electric capacity, point type distributed topology structure comprises DC bus capacitor group and the positive and negative busbar of capacitance group and the first voltage transformer pt 1_Udc, second voltage instrument transformer PT2_Udc, the first grading resistor R4, the second grading resistor R5, DC bus capacitor group comprises the power capacitor C1 that some middle point types distribute, C2, the power capacitor that middle point type distributes is connected on the positive and negative busbar of capacitance group, drawing center line from the mid point of capacitance group is connected with the neutral line of three phase mains, the first voltage transformer pt 1_Udc and the first grading resistor R4 are connected in parallel between capacitance group mid point and the positive busbar of capacitance group, and second voltage instrument transformer PT2_Udc and the second grading resistor R5 are connected in parallel between capacitance group mid point and the positive and negative busbar of capacitance group, 1. six electronic switching devices of power conversion unit form three-phase half-bridge PWM electronic switching circuit, its positive-negative input end connects respectively the positive and negative busbar of capacitance group, the three-phase output line of drawing from the mid point of three-phase half-bridge has centre path current and detects instrument transformer CT_IB, three-phase output line successively by reactor module 3., 4. fuse 6, A.C. contactor KM1 be connected A phase line, B phase line and the C phase line of three phase mains with main circuit breaker QF1.A.C. contactor KM1 4. three contacts of one end is connected with A phase line, B phase line, C phase line on three-phase four-wire system electrical network by main circuit breaker QF1 respectively, and three contacts of the other end are connected with fuse 6 (FU1, FU2, FU3) respectively; The two ends of three contacts of A.C. contactor are parallel with respectively the first charging resistor R1, the second charging resistor R2, the 3rd charging resistor R3; The first charging resistor R1 is connected in parallel on the two ends, contact that are connected with A phase line, and the second charging resistor R2 is connected in parallel on the two ends, contact that are connected with B phase line, and the 3rd charging resistor R3 is connected in parallel on the two ends, contact that are connected with C phase line.3. reactor module comprises three reactors, is respectively the first reactor L1, the second reactor L2 and the 3rd reactor L3; The first reactor L1, one end of the second reactor L2 and the 3rd reactor L3 is connected respectively the three-phase output line of power conversion unit, and the other end is electrically connected with fuse FU1, FU2, FU3 respectively.5. main circuit also comprises filter branch, the characteristic frequency of setting for Active Power Filter-APF control circuit described in filtering, and 3. described filter branch one end and described reactor module are electrically connected, and the other end is connected with the neutral line of three phase mains respectively.Filter branch filtering device identical by three groups and that be connected in parallel forms, every group of filtering device is made up of capacitor of a resistor in series, capacitor in three groups of filtering devices is corresponding and the first reactor L1 respectively, the second reactor L2 is connected with the 3rd reactor L3, and the resistor in three groups of filtering devices connects the neutral line of three phase mains.Control circuit comprises DSP digital signal processing unit and FPGA field programmable gate array unit, carry out analyzing and processing for the phase line current signal that the current transformer of the nonlinear load end receiving is transmitted, the control signal that the electronic switching device of output power ratio control converter unit is opened or turn-offed.
1. six electronic switching devices of power conversion unit refer to the integrated circuit modules being made up of six IGBT unit.IGBT (Insulated Gate Bipolar Transistor), insulated gate bipolar transistor, the compound full-control type voltage driven type power semiconductor being formed by BJT (double pole triode) and MOS (insulating gate type field effect tube).The first voltage transformer (i.e. PT1_Udc in figure) and second voltage instrument transformer (i.e. PT2_Udc in figure) all belong to collection signal category, the first voltage transformer is for gathering the voltage on the first DC bus capacitor C1, and second voltage instrument transformer is for gathering the voltage on the second DC bus capacitor C2.If the first DC bus capacitor C1 and/or the second DC bus capacitor C2 overtension; exceed electric capacity rated voltage, electric capacity can explode, if secondly busbar voltage fluctuation; also can affect output waveform and voltage; can affect like this control effect of load, if minor swing has been known again undulating value; in PWM copped wave, can compensate by adjusting pulse so; if fluctuation is large, do not compensate, just can be by control circuit halt system work protection load.The mentioned load of the utility model comprises nonlinear load.The effect of the first current detecting instrument transformer (i.e. CT_IB in figure) is to detect six electronic switching devices 1. to form the electric current that D1 three-phase half-bridge PWM electronic switching circuit self is exported.First grading resistor R4 one end connects the positive pole of the first DC bus capacitor C1, and the other end connects the negative pole of the first DC bus capacitor C1, and one end of the second grading resistor R5 connects the positive pole of the second DC bus capacitor C2, and the other end connects the negative pole of the second DC bus capacitor C2; Between the first grading resistor R4 and the second grading resistor R5, draw a connecting line, be electrically connected on the connecting line between the first DC bus capacitor C1 and the second DC bus capacitor C2.It is the effect that the first DC bus capacitor C1 and the second DC bus capacitor C2 all press that the effect of the first grading resistor R4 and the second grading resistor R5 is mainly played, in the time that the electrical potential difference of two electric capacity is unequal, all press by grading resistor, object is that the voltage of two electric capacity is equated.
The terminal CTL1 being connected with control circuit in Fig. 1, CTL2, CTL3 is for receiving the current transformer that three Current Transmit _ IL(is nonlinear load end) binding post of the induction information that transmits, three binding posts receive three phase line current informations.Other ports that are connected with control circuit in Fig. 1 are the binding post with extraneous other circuit as control circuit.The crust of the device earth connection of the active power filter for three-phase four-wire system based on Pointwise Topology in electric capacity described in the utility model.
First electric current passes through main circuit breaker (prerequisite be now main circuit breaker in closure state) out from phase power supply, pre-charge resistance R1 flows through, R2, R3 is to the first DC bus capacitor C1, the second DC bus capacitor C2 is not controlled the rectification first stage, for example, when reaching (600V) after certain numerical value, by hardware control circuit (i.e. hardware control circuit DSP+FPGA in figure, be used for sampling of the present utility model, signal analysis, the signal controlling of drive circuit) button operation, closed A.C. contactor KM1, to the first DC bus capacitor C1, the second DC bus capacitor C2 carries out boost copped wave and boosts, to opening or turn-off by PWM power ratio control device, DC bus capacitor the first capacitor C 1 and the second capacitor C 2 are charged, make the voltage of DC side reach default desired value (for example 800V).Undertaken and net operation by the operation of relevant man-machine interface, if grid-connected normal, start compensate function operation.Filtering is mainly the detection nonlinear load electric current real-time by the three Current Transmit _ IL of load-side, using real-time detection nonlinear load electric current as the real-time electric current LEM that sends hardware circuit board to of testing result, for example 5A becomes 25mA), through the harmonious ripple current separation of over-sampling circuit algorithm process, (for example power frequency is 50HZ, if having triple-frequency harmonics in electric current is exactly 150HZ, through harmonic current separation algorithm, triple-frequency harmonics can be extracted), the harmonic current that nonlinear load is produced is separated as instruction current, carry out the shutoff of opening of power ratio control device, produce the circuit that the contrary electric current of and instruction size of current equal direction injects this nonlinear load, offset with this harmonic current that nonlinear load produces.Positive sequence negative phase-sequence is directly injected through phase line, the harmonic current of filtering nonlinear load.Zero-sequence current will first pass through grid sources system, then the grid sources system center line of flowing through, through APF device center line, and inflow device, then pass through device associated components, then by device phase line compensation filtering.CT_IS-the second current transformer is for detection of the current transformer of the network system of access user.
It should be pointed out that above the utility model embodiment can make those skilled in the art's comprehend the utility model, but limit never in any form the utility model.Therefore, although this specification and embodiment have been described in detail to the utility model,, it will be appreciated by those skilled in the art that still and can modify or be equal to replacement the utility model; And all do not depart from technical scheme and the improvement thereof of the spirit and scope of the utility model creation, be all encompassed in the utility model and create in the middle of the protection range of patent.
Claims (7)
1. the active power filter for three-phase four-wire system based on Pointwise Topology in electric capacity, it is characterized in that, comprise main circuit and for controlling the control circuit of main circuit, described main circuit comprises the power conversion unit with point type distributed topology structure in electric capacity, in described electric capacity, point type distributed topology structure comprises DC bus capacitor group and the positive and negative busbar of capacitance group and the first voltage transformer, second voltage instrument transformer, the first grading resistor, the second grading resistor, described DC bus capacitor group comprises the power capacitor that some middle point types distribute, the power capacitor that described middle point type distributes is connected on the positive and negative busbar of capacitance group, drawing center line from the mid point of described capacitance group is connected with the neutral line of three phase mains, described the first voltage transformer and the first grading resistor are connected in parallel between described capacitance group mid point and the positive busbar of capacitance group, and described second voltage instrument transformer and the second grading resistor are connected in parallel between described capacitance group mid point and the positive and negative busbar of capacitance group, six electronic switching devices of described power conversion unit form three-phase half-bridge PWM electronic switching circuit, its positive-negative input end connects respectively the positive and negative busbar of capacitance group, the three-phase output line of drawing from the mid point of three-phase half-bridge has centre path current and detects instrument transformer, and described three-phase output line is connected A phase line, B phase line and the C phase line of three phase mains successively with main circuit breaker by reactor module, fuse, A.C. contactor.
2. the active power filter for three-phase four-wire system based on Pointwise Topology in electric capacity according to claim 1, it is characterized in that, three contacts of described A.C. contactor one end are connected with A phase line, B phase line, C phase line on three-phase four-wire system electrical network respectively, and three contacts of the other end are connected with fuse FU1, FU2, FU3 respectively; The two ends of three contacts of described A.C. contactor are parallel with respectively the first charging resistor R1, the second charging resistor R2, the 3rd charging resistor R3; Described the first charging resistor R1 is connected in parallel on the two ends, contact that are connected with A phase line, and described the second charging resistor R2 is connected in parallel on the two ends, contact that are connected with B phase line, and described the 3rd charging resistor R3 is connected in parallel on the two ends, contact that are connected with C phase line.
3. the active power filter for three-phase four-wire system based on Pointwise Topology in electric capacity according to claim 1, is characterized in that, described reactor module comprises three reactors, is respectively the first reactor L1, the second reactor L2 and the 3rd reactor L3; One end of described the first reactor L1, the second reactor L2 and the 3rd reactor L3 is connected respectively the three-phase output line of power conversion unit, and the other end is electrically connected with fuse FU1, FU2, FU3 respectively.
4. the active power filter for three-phase four-wire system based on Pointwise Topology in electric capacity according to claim 1, is characterized in that, six electronic switching devices of described power conversion unit are selected six IGBT unit composition integrated circuit modules.
5. the active power filter for three-phase four-wire system based on Pointwise Topology in electric capacity according to claim 1, it is characterized in that, described main circuit also comprises filter branch, the characteristic frequency of setting for Active Power Filter-APF control circuit described in filtering, 3. one end of described filter branch and described reactor module are electrically connected, and the other end is connected with the neutral line of three phase mains respectively.
6. the active power filter for three-phase four-wire system based on Pointwise Topology in electric capacity according to claim 1, it is characterized in that, described filter branch filtering device identical by three groups and that be connected in parallel forms, every group of filtering device is made up of capacitor of a resistor in series, capacitor in three groups of filtering devices is corresponding and the first reactor L1 respectively, the second reactor L2 is connected with the 3rd reactor L3, and the resistor in three groups of filtering devices connects the neutral line of three phase mains.
7. according to the active power filter for three-phase four-wire system based on Pointwise Topology in electric capacity one of claim 1 to 5 Suo Shu, it is characterized in that, described control circuit comprises DSP digital signal processing unit and FPGA field programmable gate array unit, carry out analyzing and processing for the phase line current signal that the current transformer of the nonlinear load end receiving is transmitted, the control signal that the electronic switching device of output power ratio control converter unit is opened or turn-offed.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320867572.0U CN203707776U (en) | 2013-12-26 | 2013-12-26 | Three-phase four-wire system active power filter based on capacitor midpoint topology |
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| CN201320867572.0U CN203707776U (en) | 2013-12-26 | 2013-12-26 | Three-phase four-wire system active power filter based on capacitor midpoint topology |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104092225A (en) * | 2014-07-11 | 2014-10-08 | 山东新风光电子科技发展有限公司 | Power distribution network comprehensive compensation device and control algorithm thereof |
| CN104158193A (en) * | 2014-08-22 | 2014-11-19 | 河南柏特电气设备有限公司 | Active electric power filtering apparatus based on three-loop control, and three-loop control method |
| CN107925365A (en) * | 2015-08-31 | 2018-04-17 | 艾思玛太阳能技术股份公司 | Operate the method and inverter of inverter |
-
2013
- 2013-12-26 CN CN201320867572.0U patent/CN203707776U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104092225A (en) * | 2014-07-11 | 2014-10-08 | 山东新风光电子科技发展有限公司 | Power distribution network comprehensive compensation device and control algorithm thereof |
| CN104158193A (en) * | 2014-08-22 | 2014-11-19 | 河南柏特电气设备有限公司 | Active electric power filtering apparatus based on three-loop control, and three-loop control method |
| CN107925365A (en) * | 2015-08-31 | 2018-04-17 | 艾思玛太阳能技术股份公司 | Operate the method and inverter of inverter |
| CN107925365B (en) * | 2015-08-31 | 2020-07-07 | 艾思玛太阳能技术股份公司 | Method for operating an inverter and inverter |
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