CN114268105A - Three-bridge-arm series active voltage quality regulator based on parasitic booster circuit and control method - Google Patents

Three-bridge-arm series active voltage quality regulator based on parasitic booster circuit and control method Download PDF

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Publication number
CN114268105A
CN114268105A CN202010972360.3A CN202010972360A CN114268105A CN 114268105 A CN114268105 A CN 114268105A CN 202010972360 A CN202010972360 A CN 202010972360A CN 114268105 A CN114268105 A CN 114268105A
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China
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thyristor
switch tube
voltage
bridge arm
switching tube
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CN202010972360.3A
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王森
刘咏妮
荣为青
王萍
张俊奇
高鹏
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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 invention discloses a three-bridge-arm series active voltage quality regulator based on a parasitic booster circuit and a control method thereof, wherein the topological structure mainly comprises a bypass part and a main part, the main part comprises a left bridge arm, a middle bridge arm, a right bridge arm, a direct current bus capacitor C1, a filter inductor L1 and a filter inductor L2, the bypass part comprises a thyristor VT and a contactor K which are reversely connected in parallel, the thyristor VT is connected with the contactor K, one end of the bypass part is connected with an L line of a power grid, and the other end of the bypass part is connected with the anode of a load ZL. In the invention, a parasitic boost circuit is formed between the left bridge arm and the right bridge arm to realize the lifting of the bus voltage and the correction of the power factor at the rectification side, the topological structure can adjust the triggering of the thyristor of the right bridge arm according to the size of the compensation voltage, adjust the size of the bus voltage, reduce the bus voltage under the condition of compensating small voltage to improve the output efficiency, improve the bus voltage under the condition of compensating large voltage to ensure the compensation capability of the topology under the condition of large voltage drop.

Description

Three-bridge-arm series active voltage quality regulator based on parasitic booster circuit and control method
Technical Field
The invention relates to the field of power quality management, in particular to a three-bridge-arm series active voltage quality regulator based on a parasitic booster circuit and a control method.
Background
With the development of industrial technology, the quantity and the types of electric equipment are increasing day by day, and voltage quality problems such as undervoltage, overvoltage, voltage harmonic waves and the like are easy to generate.
Aiming at the existing voltage quality problem, the current treatment measures are a voltage regulating transformer and a series active voltage quality regulator without the transformer; the transformer has heavy weight, can only fixedly regulate voltage and cannot solve the problems of overvoltage and voltage harmonic, and is easy to be saturated magnetically and has larger loss when the load is larger; the existing transformer-free series active voltage quality regulator is based on a half-bridge structure essentially, the output often has larger ripples and requires larger filter parameters to increase the volume of equipment, the topological structure bus voltage based on the DySC is obtained by rectification through an uncontrolled rectifier bridge on the parallel side, so the size of the bus voltage is greatly influenced by the grid voltage, when the grid voltage is larger, the bus grid is higher enough to compensate the voltage, when the grid voltage drop depth is larger, the bus voltage is also reduced to a lower value and cannot meet the requirement of voltage compensation, and the topological structure of the DySC cannot meet the compensation of the large drop depth; the topological structure based on the H-bridge and the PB-AVQR ensures that the bus voltage is always maintained at a higher level, can meet the compensation of large drop depth voltage, but the bus voltage is excessive when the voltage is compensated for a small voltage, so the output efficiency of the equipment is lower.
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 three-bridge-arm series active voltage quality regulator based on a parasitic booster circuit.
In order to achieve the purpose, the invention adopts the technical scheme that: a three-bridge-arm series active voltage quality regulator based on a parasitic booster circuit mainly comprises a bypass part and a main part, wherein the main part comprises a left bridge arm, a middle bridge arm, a right bridge arm, a direct-current bus capacitor C1, a filter inductor L1 and a filter inductor L2,
the left bridge arm comprises a switch tube V1 and a switch tube V2 which are connected in series, a collector of the switch tube V1 is connected with the positive electrode of a direct-current bus capacitor C1, and an emitter of the switch tube V2 is connected with the negative electrode of a direct-current bus capacitor C1;
the middle bridge arm comprises a switch tube V3 and a switch tube V4 which are connected in series, a collector of the switch tube V3 is connected with the positive electrode of a direct-current bus capacitor C1, and an emitter of the switch tube V4 is connected with the negative electrode of a direct-current bus capacitor C1;
the right bridge arm comprises a thyristor V5 and a thyristor V6 which are connected in series, the cathode of the thyristor V5 is connected with the collector of a switch tube V3, and the anode of the thyristor V6 is connected with the emitter of a switch tube V4;
one end of the filter inductor L1 is connected with the anode of the thyristor V5 or the cathode of the thyristor V6, and the other end is connected with the negative electrode of the load ZL; one end of the filter inductor L2 is connected with the emitter of the switch tube V3 or the collector of the switch tube V4, and the other end is connected with the anode of the load ZL;
the bypass part comprises a thyristor VT and a contactor K which are connected in parallel in an opposite direction, the thyristor VT is connected with the contactor K, one end of the bypass part is connected with an L line of a power grid, and the other end of the bypass part is connected with the anode of a load ZL.
Preferably, the main circuit part further comprises a filter capacitor C2, the filter capacitor C2 is connected in parallel to two ends of the main circuit part, one end of the filter capacitor C2 is connected to the L line of the power grid, and the other end of the filter capacitor C2 is connected to the positive pole of the load ZL.
Preferably, the main path section further comprises a diode VD1Diode VD2Diode VD3And a diode VD4Diode VD1Diode VD2The reverse parallel diodes of the switch tube V1 and the switch tube V2 respectively and the diode VD3And a diode VD4The reverse parallel diodes are respectively a switch tube V1 and a switch tube V2.
In a specific embodiment, the switching tube V1, the switching tube V2, the switching tube V3 and the switching tube V4 are all IGBT switching tubes.
Another object of the present invention is to provide a control method for the three-arm series active voltage quality regulator based on the parasitic boost circuit, which includes the following steps:
when the grid voltage is in a positive half cycle, the switching tube V1 and the switching tube V2 of the left bridge arm are in an alternately conducting state, when the switching tube V1 is turned off and the switching tube V2 is turned on, the grid power supply Vs charges the filter inductor L1 through a path V2-V6-L1, and when the switching tube V1 is turned on and the switching tube V2 is turned off, the grid power supply Vs and the filter inductor L1 are turned on through a path VD1The capacitor C1 is charged by the capacitor C1-V6-L1, and in the process, the energy stored by the filter inductor L1 is transferred to the capacitor C1, so that boost of the capacitor C1 is realized;
when the grid voltage is in a negative half cycle, the switching tube V1 and the switching tube V2 of the left bridge arm are in an alternately conducting state, when the switching tube V1 conducts the switching tube V2 and is turned off, the grid power supply Vs charges the filter inductor L1 through a path L1-V5-V1, and when the switching tube V1 turns off the switching tube V2 and is conducted, the grid power supply Vs and the filter inductor L1 are connected through a path L1-V5-C1-V1D2The filter capacitor C1 is charged, and the energy stored in the filter inductor L1 is transferred to the direct current bus capacitor C1 in the process, so that boost of the direct current bus C1 is realized.
Preferably, when the voltage of the power grid is normal, a thyristor VT of the bypass portion and a contactor K give a conducting signal at the same time, the thyristor VT is switched off after the contactor K is closed, the power grid power supply Vs supplies power to the load ZL through the contactor K of the bypass portion, and at this time, the circuit is in a bypass operation state; when the voltage of the power grid is abnormal, the thyristor VT of the bypass part triggers the conduction contactor K to be disconnected, the load current output by the main circuit part commutates the load current flowing through the thyristor VT to the main circuit, the thyristor VT is disconnected at the moment, and the circuit is switched to the main circuit running state.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:
1) a parasitic boost circuit is formed between the left bridge arm and the right bridge arm, and under the condition that the voltage of the bus of the voltage quality regulator is inverted and compensated to drop, the bus voltage is maintained at a higher value, so that the compensation capability of the regulator is ensured to maintain the stability of the load voltage;
2) the invention can adjust the size of the trigger angle of the thyristor according to the size of the compensation voltage, so that the bus voltage can meet the requirement of the compensation voltage and cannot be too high, therefore, a low-voltage-resistant device can be selected to reduce the volume and the cost of equipment and improve the output efficiency of topology;
3) compared with a half-bridge voltage quality regulator, the topology provided by the invention outputs the compensation voltage through single-phase full-bridge inversion, so that the output ripple is small, a large filtering parameter is not needed, and the size of equipment can be reduced;
4) compared with the existing voltage quality regulator, the voltage quality regulator can compensate voltage drop and realize the quality of a point of voltage harmonic wave, thereby ensuring the quality of power supply voltage.
Drawings
FIG. 1 is a block diagram of a three-arm series active voltage quality regulator based on a parasitic boost circuit in accordance with the present invention;
fig. 2 is a state when the switching tube V2 is turned on in the commutation process of the parasitic boost circuit formed between the bridge arms when the grid voltage is positive and half cycles according to the present invention;
fig. 3 is a state when the switching tube V1 is turned on in the commutation process of the parasitic boost circuit formed between the bridge arms when the grid voltage is positive and half cycles according to the present invention;
fig. 4 is a state when the switching tube V1 is turned on in the commutation process of the parasitic boost circuit formed between the bridge arms at the negative half cycle of the grid voltage according to the present invention;
fig. 5 shows the state of the switching tube V2 when conducting during commutation of the parasitic boost circuit formed between the bridge arms during the negative half cycle of the grid voltage.
Detailed Description
The technical solution of the present invention is further explained with reference to the drawings and the specific embodiments.
A three-bridge-arm series active voltage quality regulator based on a parasitic booster circuit mainly comprises a bypass part and a main part in a topological structure.
Referring to fig. 1, the main circuit portion includes a left arm, a middle arm, a right arm, a dc bus capacitor C1, a filter inductor L1, a filter inductor L2, and a filter capacitor C2.
The left arm comprises a switch tube V1 and a switch tube V2 which are connected in series, a collector of the switch tube V1 is connected with the positive electrode of a direct-current bus capacitor C1, and an emitter of the switch tube V2 is connected with the negative electrode of a direct-current bus capacitor C1.
The middle bridge arm comprises a switching tube V3 and a switching tube V4 which are connected in series, a collector of the switching tube V3 is connected with the positive electrode of a direct-current bus capacitor C1, and an emitter of the switching tube V4 is connected with the negative electrode of a direct-current bus capacitor C1.
The right arm comprises a thyristor V5 and a thyristor V6 which are connected in series, the cathode of the thyristor V5 is connected with the collector of a switch tube V3, and the anode of the thyristor V6 is connected with the emitter of a switch tube V4.
One end of the filter inductor L1 is connected with the anode of the thyristor V5 or the cathode of the thyristor V6, and the other end is connected with the negative electrode of the load ZL; one end of the filter inductor L2 is connected to the emitter of the switching tube V3 or the collector of the switching tube V4, and the other end is connected to the positive electrode of the load ZL.
And the filter capacitor C2 is connected in parallel at two ends of the bypass part, one end of the filter capacitor C2 is connected with the L line of the power grid, and the other end of the filter capacitor C2 is connected with the anode of the load ZL.
The bypass part comprises a thyristor VT and a contactor K which are connected in parallel in an opposite direction, the thyristor VT is connected with the contactor K, one end of the bypass part is connected with an L line of a power grid, and the other end of the bypass part is connected with the anode of a load ZL.
Here, the main path part further includes a diode VD1Diode VD2Diode VD3And a diode VD4Diode VD1Diode VD2The reverse parallel diodes of the switch tube V1 and the switch tube V2 respectively and the diode VD3And a diode VD4The reverse parallel diodes are respectively a switch tube V1 and a switch tube V2. The switch tube V1, the switch tube V2, the switch tube V3 and the switch tube V4 all adopt IGBT switch tubes.
Fig. 2 and 3 show that when the grid voltage is in a positive half cycle, a boost circuit is formed between the left arm and the right arm, the switching tube V1 and the switching tube V2 of the left arm are alternately turned on, and as shown in fig. 2, when the switching tube V1 is turned off and the switching tube V2 is turned on, the grid power supply Vs charges the filter inductor L1 through a path V2-V6-L1, and in this process, the energy stored in the filter inductor L1 is transferred to the dc bus capacitor C1, so that the boost process of the dc bus capacitor C1 is realized. As shown in fig. 3, when the switching tube V1 is turned on and the switching tube V2 is turned off, the grid power source Vs and the filter inductor L1 charge the dc bus capacitor C1 through a path VD1-C1-V6-L1, in this process, the grid power source Vs and the filter inductor L1 charge the dc bus capacitor C1 together, and the energy stored in the filter inductor L1 at the previous stage is transferred to the dc bus capacitor C1, which is a boost process of the positive half cycle of the grid voltage.
Fig. 4 and 5 show the process of forming a boost circuit between the arms when the grid voltage is in the negative half cycle, and the switching tube V1 and the switching tube V2 of the left arm are alternately turned on. As shown in fig. 4, when the switching tube V1 turns on the switching tube V2 and turns off, the grid power supply charges the filter inductor L1 through the path L1-V5-V1, and as shown in fig. 5, when the switching tube V1 turns off the switching tube V2 and turns on, the grid power supply Vs and the filter inductor L1 charge the dc bus capacitor C1 through the path L1-V5-C1-VD2, in this process, the grid power supply Vs and the filter inductor L1 charge the dc bus capacitor C1 together, and the energy stored in the filter inductor L1 at the previous stage is transferred to the dc bus capacitor C1, which is a complete boost process.
When the voltage of the power grid is normal, a thyristor VT of the bypass part and a contactor K give a conducting signal at the same time, the thyristor VT is disconnected after the contactor K is closed, a power grid power supply Vs supplies power to a load ZL through the contactor K of the bypass part, and at the moment, the circuit is in a bypass operation state; when the voltage of the power grid is abnormal, the thyristor VT of the bypass part triggers the conduction contactor K to be disconnected, the load current output by the main circuit part commutates the load current flowing through the thyristor VT to the main circuit, the thyristor VT is disconnected at the moment, and the circuit is switched to the main circuit running state. The H bridge inverter of the main circuit outputs compensation voltage to maintain the stability of load voltage, and the state is the main circuit operation state. When the voltage of the power grid drops, the H bridge implements a control strategy of in-phase compensation, and when the power grid is in overvoltage, the H bridge implements a control strategy of phase-shift compensation.
As can be known from the commutation processes in fig. 2 to fig. 5, in the process of the alternating conduction of the left half-bridge IGBT tube, a parasitic voltage circuit is formed, and the filter inductor L1 periodically stores energy and transfers the energy to the dc bus voltage C1 to raise the bus voltage, but when the grid voltage drops to a small value, the bus voltage is significantly higher than the requirement of the compensation voltage, so that the output efficiency of the device is reduced.
Due to the characteristics of a topological structure, a parasitic boost circuit can be formed in the process that the left bridge arm and the right bridge arm act on the switching tube to maintain the bus voltage at a higher level, the boost effect of the H bridge formed by the two IGBT bridge arms is different along with different bus voltages of modulation modes, the bus voltage is always at a higher level and is higher than the requirement of voltage compensation, meanwhile, when the voltage drop is smaller, the bus voltage is always excessive for the voltage compensation, and the excessive and high bus voltage not only needs to use a larger voltage-resistant device to increase the volume and the cost of equipment, but also can reduce the output efficiency of the regulator. Based on the method, the trigger angle of the right bridge arm thyristor can be adjusted according to the compensation voltage, the bus voltage is adjusted, the output efficiency of the topology is improved, when the compensation voltage is small, the trigger angle is increased, the rectified bus voltage is reduced, when the compensation voltage is not large, the trigger angle is reduced, the rectified bus voltage value is increased, the bus voltage is not too high under the condition that the compensation requirement is met, and the output efficiency of the regulator is improved.
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 (6)

1. A three-bridge-arm series active voltage quality regulator based on a parasitic booster circuit mainly comprises a bypass part and a main part, and is characterized in that the main part comprises a left bridge arm, a middle bridge arm, a right bridge arm, a direct current bus capacitor C1, a filter inductor L1 and a filter inductor L2,
the left bridge arm comprises a switch tube V1 and a switch tube V2 which are connected in series, a collector of the switch tube V1 is connected with the positive electrode of a direct-current bus capacitor C1, and an emitter of the switch tube V2 is connected with the negative electrode of a direct-current bus capacitor C1;
the middle bridge arm comprises a switch tube V3 and a switch tube V4 which are connected in series, a collector of the switch tube V3 is connected with the positive electrode of a direct-current bus capacitor C1, and an emitter of the switch tube V4 is connected with the negative electrode of a direct-current bus capacitor C1;
the right bridge arm comprises a thyristor V5 and a thyristor V6 which are connected in series, the cathode of the thyristor V5 is connected with the collector of a switch tube V3, and the anode of the thyristor V6 is connected with the emitter of a switch tube V4;
one end of the filter inductor L1 is connected with the anode of the thyristor V5 or the cathode of the thyristor V6, and the other end is connected with the negative electrode of the load ZL; one end of the filter inductor L2 is connected with the emitter of the switch tube V3 or the collector of the switch tube V4, and the other end is connected with the anode of the load ZL;
the bypass part comprises a thyristor VT and a contactor K which are connected in parallel in an opposite direction, the thyristor VT is connected with the contactor K, one end of the bypass part is connected with an L line of a power grid, and the other end of the bypass part is connected with the anode of a load ZL.
2. The three-arm series active voltage quality regulator based on the parasitic booster circuit according to claim 1, wherein the main circuit part further comprises a filter capacitor C2, the filter capacitor C2 is connected in parallel with two ends of the bypass part, one end is connected with an L line of a power grid, and the other end is connected with a positive electrode of a load ZL.
3. The parasitic boost circuit based three-bridge arm series active voltage quality regulator of claim 1, wherein said main circuit portion further comprises a diode VD1Diode VD2Diode VD3And a diode VD4Diode VD1Diode VD2The reverse parallel diodes of the switch tube V1 and the switch tube V2 respectively and the diode VD3And a diode VD4The reverse parallel diodes are respectively a switch tube V1 and a switch tube V2.
4. The three-arm series active voltage quality regulator based on the parasitic boost circuit of claim 1, wherein the switch tube V1, the switch tube V2, the switch tube V3 and the switch tube V4 all adopt IGBT switch tubes.
5. The method for controlling the three-arm series active voltage quality regulator based on the parasitic boost circuit according to any one of claims 1 to 4, characterized by comprising the following steps:
when the grid voltage is in a positive half cycle, the switching tube V1 and the switching tube V2 of the left bridge arm are in an alternately conducting state, when the switching tube V1 is turned off and the switching tube V2 is turned on, the grid power supply Vs charges the filter inductor L1 through a path V2-V6-L1, and when the switching tube V1 is turned on and the switching tube V2 is turned off, the grid power supply Vs and the filter inductor L1 are turned on through a path VD1The capacitor C1 is charged by the capacitor C1-V6-L1, and in the process, the energy stored by the filter inductor L1 is transferred to the capacitor C1, so that boost of the capacitor C1 is realized;
when the grid voltage is in a negative half cycle, the switching tube V1 and the switching tube V2 of the left bridge arm are in an alternately conducting state, when the switching tube V1 conducts the switching tube V2 and is turned off, the grid power supply Vs charges the filter inductor L1 through a path L1-V5-V1, and when the switching tube V1 turns off the switching tube V2 and is conducted, the grid power supply Vs and the filter inductor L1 are connected through a path L1-V5-C1-V1D2Charging the filter capacitor C1, and storing the filter inductor L1The stored energy is transferred to the direct current bus capacitor C1, and boost of the direct current bus C1 is realized.
6. The control method of the three-arm series active voltage quality regulator based on the parasitic booster circuit as claimed in claim 5, wherein when the grid voltage is normal, the thyristor VT of the bypass part and the contactor K give conducting signals at the same time, the thyristor VT is disconnected after the contactor K is closed, the grid power supply Vs supplies power to the load ZL through the contactor K of the bypass part, and the circuit is in a bypass operation state; when the voltage of the power grid is abnormal, the thyristor VT of the bypass part triggers the conduction contactor K to be disconnected, the load current output by the main circuit part commutates the load current flowing through the thyristor VT to the main circuit, the thyristor VT is disconnected at the moment, and the circuit is switched to the main circuit running state.
CN202010972360.3A 2020-09-16 2020-09-16 Three-bridge-arm series active voltage quality regulator based on parasitic booster circuit and control method Pending CN114268105A (en)

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CN202010972360.3A CN114268105A (en) 2020-09-16 2020-09-16 Three-bridge-arm series active voltage quality regulator based on parasitic booster circuit and control method

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Application Number Priority Date Filing Date Title
CN202010972360.3A CN114268105A (en) 2020-09-16 2020-09-16 Three-bridge-arm series active voltage quality regulator based on parasitic booster circuit and control method

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CN114268105A true CN114268105A (en) 2022-04-01

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