CN212412768U - Novel transformerless three-bridge-arm series active voltage quality regulator - Google Patents

Novel transformerless three-bridge-arm series active voltage quality regulator Download PDF

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CN212412768U
CN212412768U CN202022032749.8U CN202022032749U CN212412768U CN 212412768 U CN212412768 U CN 212412768U CN 202022032749 U CN202022032749 U CN 202022032749U CN 212412768 U CN212412768 U CN 212412768U
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bridge arm
diode
switch tube
capacitor
voltage
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王森
荣为青
刘咏妮
贾梅梅
周大磊
王启华
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Suzhou Actionpower Power Supply Technology Co ltd
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Suzhou Actionpower Power Supply Technology Co ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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    • Y02E40/40—Arrangements for reducing harmonics

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Abstract

The utility model discloses a novel no transformer three bridge arms active voltage quality control ware of establishing ties, its topological structure mainly includes main road and bypass, and the main road includes left bridge arm, middle bridge arm, right bridge arm, inductance L1A direct current bus capacitor, a passive filter, a left bridge arm, a middle bridge arm and an inductor L1A parallel rectification part constituting a main path; the middle bridge arm, the right bridge arm and the passive filter form a series inversion part of the main circuit. The utility model discloses an among the topological structure, can form boost circuit between each bridge arm, it is darker and in voltage dropWhen the compensation voltage is inverted, the bus voltage is maintained at a higher value, so that compared with the existing active voltage quality control device without a transformer in series connection, the compensation voltage quality control device has higher efficiency and smaller volume under the condition of the same compensation capacity.

Description

Novel transformerless three-bridge-arm series active voltage quality regulator
Technical Field
The utility model relates to a field is administered to the electric energy quality, concretely relates to novel no transformer three bridge arms series connection active voltage quality control ware.
Background
The series active voltage quality regulator without transformer is mostly applied to the occasion of low power, the volume of the regulator is generally required to be very small, namely the power density is high, and the cost is also a problem which must be considered. Meanwhile, how to improve the compensation capability of the active voltage quality regulator is also a permanent effort direction. For the existing topological structures, namely a DySC topological structure, a back-to-back H-bridge topological structure and a PB-AVQR topological structure, the existing topological structures are collectively called as a half-bridge type transformerless topology, the performance of the existing topological structures is limited by the characteristics of a half-bridge system, the existing topological structures have large output ripples and need large filtering parameters, and meanwhile, a direct current bus is higher, needs an IGBT tube with high voltage-resistant grade and needs more direct current side capacitors; the higher bus voltage causes the safety distance of the whole system to be increased, so that the volume of the equipment is increased, and the power density of the system is reduced. Three half-bridge IGBT constitute three bridge arm topologies, because the IGBT pipe is more has the problem that the cost is on the high side.
How to solve the problems of the existing series active voltage quality regulator is the matter that the skilled person is dedicated to solve.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming the not enough of prior art, provide a novel active voltage quality control ware of no transformer three bridge arms series connection.
In order to achieve the above purpose, the utility model adopts the technical scheme that: a novel transformerless three-bridge-arm series active voltage quality regulator mainly comprises a main circuit and a bypass, wherein the main circuit comprises a left bridge arm, a middle bridge arm and a right bridge armBridge arm and inductor L1A DC bus capacitor, a passive filter, wherein,
the left bridge arm comprises a diode D connected in series1And diode D2；
The middle bridge arm comprises switch tubes V connected in series1And a switching tube V2Diode D1Cathode and switch tube V1Collector connection of diode D2Anode and switch tube V2Emitter electrode of (1) is connected with a switching tube V1Emitter or switching tube V2The collector of the grid is connected with the L line of the power grid;
the right bridge arm comprises a switch tube V connected in series3And a switching tube V4；
The inductance L1One end of the diode is connected with the N line of the power grid, and the other end of the diode is connected with the diode D1Anode or diode D2A cathode of (a);
the DC bus capacitor is a capacitor C1Capacitor C1Respectively connected with the switch tube V1Switch tube V3Is connected with the collector electrode, and the cathode is respectively connected with the switch tube V2Switch tube V4The emitter of (3) is connected;
one end of the passive filter and the switch tube V3Emitter or switching tube V4The other end of the collector is connected with an L line of a power grid;
the left bridge arm, the middle bridge arm and the inductor L1A parallel rectification part constituting a main path; the middle bridge arm, the right bridge arm and the passive filter form a series inversion part of the main circuit.
Preferably, the bypass consists of two antiparallel thyristors VT and a contactor K, the antiparallel thyristors VT and the contactor K are connected in parallel, one end of the bypass is connected with an L line of the power grid, and the other end of the bypass is connected with a load ZLAnd (4) connecting.
Preferably, the main circuit further comprises a diode VD1And diode VD2Said diode VD1And diode VD2Are respectively a switch tube V1Switch tube V2An anti-parallel diode.
Preferably, the passive filter comprises a filter inductance L2And a filter capacitor C2Filter inductance L2One end of and a switch tube V3Emitter or switching tube V4Is connected with the collector of the capacitor C, and the other end of the capacitor C is connected with the collector of the capacitor C2And a load ZLConnecting, filtering capacitor C2The other end of the filter capacitor is connected with an L line of a power grid, and the filter capacitor C2In parallel with the bypass, load ZLThe other end of the connecting rod is connected with an N line of a power grid.
As a specific embodiment, the switch tube V1Switch tube V2Switch tube V3And a switching tube V4All adopt IGBT switch tubes.
Because of above-mentioned technical scheme's application, compared with the prior art, the utility model have the following advantage:
1) a totem-pole PFC circuit is formed between the left bridge arm and the middle bridge arm, so that the bus voltage is raised when the bus voltage of the compensation voltage is reduced, the compensation performance of the system is ensured, and the compensation depth is larger;
2) the topological structure of the utility model has lower bus voltage, therefore, the pipes with low voltage-resistant grade can be used, the using quantity of bus capacitors can be reduced, the volume of the system can be effectively reduced, the cost can be reduced, and the output efficiency of the system can be improved;
3) adopt the utility model discloses a topological structure also can realize certain voltage harmonic when compensating voltage falls, guarantees the quality of electric wire netting power supply.
Drawings
Fig. 1 is a structural diagram of the transformer-less three-bridge-arm series active voltage quality regulator of the present invention;
FIG. 2 shows that the utility model discloses at the commutation in-process switch tube V of the positive half cycle time boost circuit of grid voltage2A state at the time of conduction;
FIG. 3 shows that the diode V of the present invention is used in the commutation process of the boost circuit during the positive half cycle of the grid voltageD1A state at the time of conduction;
fig. 4 shows that the utility model boosts the voltage of the power grid during the negative half cycleSwitch tube V in current conversion process1A state at the time of conduction;
fig. 5 the utility model discloses at the current conversion in-process diode V of grid voltage boost circuit during negative half cycleD1The state at the time of conduction.
Detailed Description
The technical solution of the present invention will be further explained with reference to the accompanying drawings and specific embodiments.
A novel transformerless three-bridge-arm series active voltage quality regulator mainly comprises a main circuit and a bypass in a topological structure.
Referring to fig. 1, the main circuit includes a left arm, a middle arm, a right arm, and an inductor L1A DC bus capacitor, a passive filter, wherein the left bridge arm comprises a diode D connected in series1And diode D2(ii) a The middle bridge arm comprises a switch tube V connected in series1And a switching tube V2Diode D1Cathode and switch tube V1Collector connection of diode D2Anode and switch tube V2Emitter electrode of (1) is connected with a switching tube V1Emitter or switching tube V2The collector of the grid is connected with the L line of the power grid; the right bridge arm comprises a switch tube V connected in series3And a switching tube V4(ii) a Inductor L1One end of the diode is connected with the N line of the power grid, and the other end of the diode is connected with the diode D1Anode or diode D2A cathode of (a); the DC bus capacitor is a capacitor C1Capacitor C1Respectively connected with the switch tube V1Switch tube V3Is connected with the collector electrode, and the cathode is respectively connected with the switch tube V2Switch tube V4The emitter of (3) is connected; one end of the passive filter and the switch tube V3Emitter or switching tube V4The other end of the collector is connected with an L line of the power grid. Here a switching tube V1Switch tube V2Switch tube V3And a switching tube V4All adopt IGBT switch tubes.
Here, the left leg, the middle leg and the inductance L1A parallel rectification part constituting a main path; the middle bridge arm, the right bridge arm and the passive filter form a series inversion part of the main circuit.
The main circuit further comprises a diode VD1And diode VD2Diode VD1And diode VD2Are respectively a switch tube V1Switch tube V2An anti-parallel diode.
Here, the passive filter includes a filter inductance L2And a filter capacitor C2Filter inductance L2One end of and a switch tube V3Emitter or switching tube V4Is connected with the collector of the capacitor C, and the other end of the capacitor C is connected with the collector of the capacitor C2And a load ZLConnecting, filtering capacitor C2The other end of the filter capacitor is connected with an L line of a power grid, and the filter capacitor C2In parallel with the bypass, load ZLThe other end of the connecting rod is connected with an N line of a power grid.
The bypass consists of two anti-parallel thyristors VT and a contactor K, wherein the anti-parallel thyristors VT and the contactor K are connected in parallel, one end of the bypass is connected with an L line of a power grid, and the other end of the bypass is connected with a load ZLAnd (4) connecting.
According to the topological structure, the left bridge arm and the middle bridge arm can form a totem-pole PFC circuit, so that on one hand, the bus voltage can be raised, and on the other hand, the power factor correction of the parallel rectification side can be realized.
The H bridge composed of the middle bridge arm and the right bridge arm is subjected to voltage inversion, the boosting effect of different modulation modes on the bus voltage is different, the H bridge control adopts a discontinuous unipolar SPWM (sinusoidal pulse width modulation) modulation mode, the middle bridge arm is a high-frequency bridge arm, and the right bridge arm is a power-frequency bridge arm. Lower tube V of middle bridge arm when modulation wave is larger than carrier wave2On the contrary, the upper tube V is connected1Conducting when the modulation wave is larger than 0, the upper tube V of the right bridge arm3On the contrary, the lower tube V is connected4And conducting.
Specifically, as shown in fig. 2 to 5, the PFC principle is described by taking a left arm and a middle arm as examples.
When the power supply voltage is positive for a half cycle, as shown in FIG. 2, the switch tube V2Is turned on when the power supply voltage Vs passes through the path V2-D2-L1To the inductance L1Charging is carried out; when the switch tube V2When turned off, as shown in FIG. 3, because of the inductanceCurrent can not suddenly change, switch tube V1Is connected in parallel with the diode VD1Conduction freewheeling, supply voltage Vs and inductance L1Together through path VD1-C1-D2-L1To the capacitor C1And charging is carried out. That is, the energy stored in the inductor during the switching period of FIG. 2 is transferred to the capacitor C in FIG. 31In, inductor current drops; this process is a complete boost circuit process.
When the power supply voltage is negative for half a cycle, as shown in FIG. 4, the switch tube V1Is turned on when the power supply voltage Vs passes through the path L1- D1- V1To the inductance L1Charging is carried out; when the switch tube V1When turned off, as shown in FIG. 5, the switch tube V is turned off because the inductor current cannot change abruptly2Is connected in parallel with the diode VD2Conduction freewheeling, supply voltage Vs and inductance L1Together through path L1-D1-C1- VD2To the capacitor C1Charging takes place, i.e. the energy stored in the inductor during the switching period shown in fig. 4 is transferred to the capacitor C in fig. 51In, inductor current drops; this process is a complete boost circuit process. The same applies to the positive and negative half cycles of the supply voltage, if the switching tube V is switched1Switch tube V2The modulation is carried out according to a sinusoidal signal, and the complete PFC circuit is obtained.
Obviously, under the same-phase compensation condition of low voltage, the middle bridge arm and the right bridge arm of the three-bridge-arm topological structure form an H bridge for inversion, gap voltage compensation is implemented, the two half bridges are modulated according to a sinusoidal signal in phase with the power grid voltage, the middle bridge arm and the right bridge arm can naturally complete the function of a PFC circuit with the left bridge arm, on one hand, the power factor of the parallel side is corrected, and on the other hand, the bus capacitor is charged.
In addition, in the actual operation process, when the voltage of the power grid is normal, the bypass thyristor VTThyristor V which is firstly conducted and then closed by contactor KTTurning off, and ensuring the later-stage power supply by the bypass, wherein the state is called as a bypass state; when the voltage of the power grid deviates from the rated value within a certain range, the controller detects the deviation, the bypass is closed and put into the series inversion part, and the series inversion partThe sub-output outputs the offset voltage value under the control of the controller, thereby ensuring that the load voltage keeps the rated voltage, and the state is called a main circuit operation state. In the main circuit operation state, if low voltage compensation is carried out, the series inverter adopts an in-phase compensation strategy, and if high voltage compensation is carried out, the series inverter adopts a phase-shifting control strategy.
The utility model provides a topological structure, left side bridge arm and middle bridge arm can form totem pole type PFC circuit, realize the lifting of bus voltage when compensating voltage bus voltage descends, can ensure the compensation performance of system, have bigger compensation degree of depth.
In addition the utility model provides a topological structure has lower busbar voltage, consequently can use the pipe of low withstand voltage grade and reduce the use quantity of bus-bar electric capacity, and the effectual volume reduce cost who reduces the system also can improve the output efficiency of system simultaneously.
The novel transformer-free three-bridge-arm series active voltage quality regulator adopts a discontinuous unipolar modulation mode and voltage and current double closed-loop control, the voltage loop regulation adopts repeated control and proportional control, the static error of an alternating current signal can be eliminated by utilizing the inner membrane principle of repeated control, and the differential-free tracking of an output signal to an input signal is realized; the current loop adjustment adopts proportional control to improve the open loop gain of the system; certain voltage harmonic waves can be realized while the voltage drops, and the quality of power supply of a power grid is ensured.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable people skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.

Claims (5)

1. A novel transformerless three-bridge-arm series active voltage quality regulator mainly comprises a main circuit and a bypass, and is characterized in that the main circuit comprises a left bridge arm, a middle bridge arm, a right bridge arm and an inductor L1D.c. currentA bus capacitor, a passive filter, wherein,
the left bridge arm comprises a diode D connected in series1And diode D2；
The middle bridge arm comprises switch tubes V connected in series1And a switching tube V2Diode D1Cathode and switch tube V1Collector connection of diode D2Anode and switch tube V2Emitter electrode of (1) is connected with a switching tube V1Emitter or switching tube V2The collector of the grid is connected with the L line of the power grid;
the right bridge arm comprises a switch tube V connected in series3And a switching tube V4；
The inductance L1One end of the diode is connected with the N line of the power grid, and the other end of the diode is connected with the diode D1Anode or diode D2A cathode of (a);
the DC bus capacitor is a capacitor C1Capacitor C1Respectively connected with the switch tube V1Switch tube V3Is connected with the collector electrode, and the cathode is respectively connected with the switch tube V2Switch tube V4The emitter of (3) is connected;
one end of the passive filter and the switch tube V3Emitter or switching tube V4The other end of the collector is connected with an L line of a power grid;
the left bridge arm, the middle bridge arm and the inductor L1A parallel rectification part constituting a main path; the middle bridge arm, the right bridge arm and the passive filter form a series inversion part of the main circuit.
2. The new transformerless three-bridge-arm series active voltage quality regulator of claim 1, wherein the bypass comprises two anti-parallel thyristors (VT) and a contactor (K), the anti-parallel thyristors (VT) and the contactor (K) are connected in parallel, one end of the bypass is connected with an L line of a power grid, and the other end of the bypass is connected with a load (Z)LAnd (4) connecting.
3. The novel transformerless three-bridge arm series active voltage quality regulator of claim 1, in particularCharacterized in that said main circuit further comprises a diode VD1And diode VD2Said diode VD1And diode VD2Are respectively a switch tube V1Switch tube V2An anti-parallel diode.
4. The novel transformerless three-bridge arm series active voltage quality regulator of claim 1 wherein the passive filter comprises a filter inductor L2And a filter capacitor C2Filter inductance L2One end of and a switch tube V3Emitter or switching tube V4Is connected with the collector of the capacitor C, and the other end of the capacitor C is connected with the collector of the capacitor C2And a load ZLConnecting, filtering capacitor C2The other end of the filter capacitor is connected with an L line of a power grid, and the filter capacitor C2In parallel with the bypass, load ZLThe other end of the connecting rod is connected with an N line of a power grid.
5. The new transformerless three-bridge arm series active voltage quality regulator of claim 1 wherein the switching tube V1Switch tube V2Switch tube V3And a switching tube V4All adopt IGBT switch tubes.
CN202022032749.8U 2020-09-16 2020-09-16 Novel transformerless three-bridge-arm series active voltage quality regulator Active CN212412768U (en)

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Application Number Priority Date Filing Date Title
CN202022032749.8U CN212412768U (en) 2020-09-16 2020-09-16 Novel transformerless three-bridge-arm series active voltage quality regulator

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