CN114268104A - Novel transformerless three-bridge-arm series active voltage quality regulator and control method - Google Patents
Novel transformerless three-bridge-arm series active voltage quality regulator and control method Download PDFInfo
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- CN114268104A CN114268104A CN202010972357.1A CN202010972357A CN114268104A CN 114268104 A CN114268104 A CN 114268104A CN 202010972357 A CN202010972357 A CN 202010972357A CN 114268104 A CN114268104 A CN 114268104A
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention discloses a novel transformerless three-bridge-arm series active voltage quality regulator and a control method thereof1A 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. In the topological structure, a boost circuit can be formed between each bridge arm, and the bus voltage is maintained at a higher value when the voltage drops deeper and the compensation voltage is inverted, so that the topological structure has higher efficiency and smaller volume under the condition of the same compensation capacity compared with the existing transformer-free series active voltage quality control device.
Description
Technical Field
The invention relates to the field of power quality control, in particular to a novel transformer-free three-bridge-arm series active voltage quality regulator and a control method.
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.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a novel transformerless three-bridge-arm series active voltage quality regulator.
In order to achieve the purpose, the invention 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, a right bridge 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;
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 C2Another end of (2) and the electric networkIs connected with the L line and is provided with a 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.
Another object of the present invention is a control method based on the above novel transformerless three-bridge arm series active voltage quality regulator, comprising the following steps:
when the power supply voltage is positive and half cycle, 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, the 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 C1Charging is carried out;
when the power supply voltage is negative for half a cycle, 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, the switch tube V2Is connected in parallel with the diode VD2Conduction freewheeling, supply voltage Vs and inductance L1Together through path L1-D1-C1- VD2To the capacitor C1And charging is carried out.
Preferably, the bypass thyristor V is arranged to bypass when the mains voltage is normalTThyristor V which is firstly conducted and then closed by contactor KTTurning off, namely turning on a bypass operation state; when the voltage of the power grid deviates from the rated value within a certain range, the controller closes the series inversion part of the bypass input main circuit after detecting the deviation, and the series inversion part outputs the deviation voltage value under the control of the controller, so that the load voltage is guaranteed to keep the rated voltage, and the main circuit is in the operating state at the moment.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:
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 has lower bus voltage, so that pipes with low voltage-resistant grade can be used, the using quantity of bus capacitors is reduced, the volume of the system is effectively reduced, the cost is reduced, and the output efficiency of the system can be improved;
3) by adopting the topological structure, certain voltage harmonic can be realized while compensating voltage drop, and the quality of power supply of a power grid is ensured.
Drawings
FIG. 1 is a block diagram of the novel transformerless three-bridge arm series active voltage quality regulator of the present invention;
FIG. 2 shows a switching tube V of the present invention during the commutation of the boost circuit during the positive half cycle of the grid voltage2A state at the time of conduction;
FIG. 3 shows a diode V in the commutation of the boost circuit for the positive half cycle of the grid voltage according to the present inventionD1A state at the time of conduction;
FIG. 4 shows a switching tube V of the present invention during the commutation of the boost circuit during the negative half cycle of the grid voltage1A state at the time of conduction;
FIG. 5 shows a diode V in the commutation of the boost circuit according to the invention at negative half-cycles of the mains voltageD1The state at the time of conduction.
Detailed Description
The technical solution of the present invention is further explained with reference to the drawings and the 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 tubeV1Collector 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, the switch tube V is turned off because the inductor current cannot change abruptly1Is 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 C1Is charged, i.e.The energy stored in the inductor during the switching cycle shown in fig. 4 is transferred to 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 to be put into the series inversion part, the output of the series inversion part outputs a deviation voltage value under the control of the controller, and therefore the load voltage is guaranteed to be kept at the rated voltage, and the state is called as 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.
According to the topological structure provided by the invention, the left bridge arm and the middle bridge arm can form a totem-pole PFC circuit, the bus voltage is raised when the voltage of the compensation voltage bus is reduced, the compensation performance of a system can be ensured, and the compensation depth is larger.
In addition, the topological structure provided by the invention has lower bus voltage, so that pipes with low voltage-resistant grade can be used, the number of used bus capacitors is reduced, the volume of the system is effectively reduced, the cost is reduced, and the output efficiency of the system can be improved.
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 merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to 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 within the protection scope of the present invention.
Claims (7)
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 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, and electronic device using the samePipe 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 wherein the 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 method of claim 1The transformer-free three-bridge-arm series active voltage quality regulator is characterized in that the switch tube V is1Switch tube V2Switch tube V3And a switching tube V4All adopt IGBT switch tubes.
6. The control method of the novel transformerless three-bridge-arm series active voltage quality regulator is characterized by comprising the following steps of:
when the power supply voltage is positive and half cycle, 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, the 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 C1Charging is carried out;
when the power supply voltage is negative for half a cycle, 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, the switch tube V2Is connected in parallel with the diode VD2Conduction freewheeling, supply voltage Vs and inductance L1Together through path L1-D1-C1- VD2To the capacitor C1And charging is carried out.
7. The control method of the novel transformerless three-bridge arm series active voltage quality regulator as claimed in claim 6,
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, namely turning on a bypass operation state; when the voltage of the power grid deviates from the rated value within a certain range, the controller closes the series inversion part of the bypass input main circuit after detecting the deviation, and the series inversion part outputs the deviation voltage value under the control of the controller, so that the load voltage is guaranteed to keep the rated voltage, and the main circuit is in the operating state at the moment.
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
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CN115021541A (en) * | 2022-08-09 | 2022-09-06 | 西南交通大学 | Method for suppressing pulse power of non-isolated UPQC circuit in off-network operation state |
CN115882466A (en) * | 2022-12-27 | 2023-03-31 | 三峡电能有限公司 | Power distribution network power quality management system based on AC-AC topological structure |
CN118249353A (en) * | 2024-05-21 | 2024-06-25 | 湖南大学 | Electric energy management topological structure based on primary energy conversion |
-
2020
- 2020-09-16 CN CN202010972357.1A patent/CN114268104A/en not_active Withdrawn
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN115021541A (en) * | 2022-08-09 | 2022-09-06 | 西南交通大学 | Method for suppressing pulse power of non-isolated UPQC circuit in off-network operation state |
CN115021541B (en) * | 2022-08-09 | 2022-11-04 | 西南交通大学 | Method for suppressing pulsating power of non-isolated UPQC circuit in off-grid operation state |
CN115882466A (en) * | 2022-12-27 | 2023-03-31 | 三峡电能有限公司 | Power distribution network power quality management system based on AC-AC topological structure |
CN115882466B (en) * | 2022-12-27 | 2023-10-20 | 三峡电能有限公司 | Power quality management system of power distribution network based on AC-AC topological structure |
CN118249353A (en) * | 2024-05-21 | 2024-06-25 | 湖南大学 | Electric energy management topological structure based on primary energy conversion |
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Application publication date: 20220401 |