CN212412769U - Three-bridge-arm series active voltage quality regulator based on parasitic booster circuit - Google Patents
Three-bridge-arm series active voltage quality regulator based on parasitic booster circuit Download PDFInfo
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- CN212412769U CN212412769U CN202022032750.0U CN202022032750U CN212412769U CN 212412769 U CN212412769 U CN 212412769U CN 202022032750 U CN202022032750 U CN 202022032750U CN 212412769 U CN212412769 U CN 212412769U
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Abstract
The utility model discloses a three bridge arms series connection active voltage quality control ware based on parasitic boost circuit, its topological structure mainly includes bypass part and main road part, main road part includes left bridge arm, middle bridge arm, right bridge arm, direct current bus capacitor C1, filter inductance L1, filter inductance L2, the bypass part includes reverse parallelly connected thyristor VT and contactor K, thyristor VT is connected with contactor K, the one end of bypass part and the L line connection of electric wire netting, the other end is connected with load ZL's anodal. The utility model discloses an in, form parasitic boost circuit between left side bridge arm and right bridge arm, realize busbar voltage's lifting and rectification side power factor's correction, this topological structure can adjust right bridge arm thyristor according to compensating voltage's size and trigger, adjusts the busbar voltage size, and the low busbar voltage promotes output efficiency under the condition of compensating the small voltage, promotes busbar voltage under the condition of compensating the large voltage, guarantees the compensation ability of topology under the big voltage drop condition.
Description
Technical Field
The utility model relates to a field is administered to the electric energy quality, concretely relates to three bridge arms series connection active voltage quality control wares based on parasitic boost circuit.
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.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming the not enough of prior art, provide a three-bridge arm series connection active voltage quality control ware based on parasitic boost circuit.
In order to achieve the above purpose, the utility model 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.
Because of above-mentioned technical scheme's application, compared with the prior art, the utility model have the following advantage:
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 utility model 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 can not be too high, therefore, the device with low voltage resistance can be selected to reduce the volume and the cost of the equipment, and the output efficiency of the topology is improved;
3) compared with a half-bridge voltage quality regulator, the utility model provides a topology is by single-phase full-bridge contravariant output offset voltage, therefore output ripple is less does not need very big filter parameter, can reduce the volume of equipment;
4) compare in current voltage quality regulator, the utility model discloses also can realize the quality of a bit voltage harmonic when compensating voltage falls, guarantee mains voltage's quality.
Drawings
Fig. 1 is a structural diagram of the three-arm series active voltage quality regulator based on the parasitic booster circuit of the present invention;
fig. 2 is a state of the switching tube V2 when the switching tube V2 is turned on in the commutation process of forming the parasitic boost circuit between the bridge arms when the grid voltage is positive and half cycles;
fig. 3 is a state of the switching tube V1 when the switching tube V1 is turned on in the commutation process of forming the parasitic boost circuit between the bridge arms when the grid voltage is positive and half cycles;
fig. 4 shows the state of the switching tube V1 when the switching tube V1 is turned on in the commutation process of the parasitic boost circuit formed between the bridge arms during the negative half cycle of the grid voltage;
fig. 5 the present invention discloses the state when switching tube V2 switches on in the commutation process that forms parasitic boost circuit between the bridge arms during the negative half cycle of the grid voltage.
Detailed Description
The technical solution of the present invention will be further explained with reference to the accompanying drawings and 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 switch V1 is turned on and the switch V2 is turned off, the grid power source Vs and the filter inductor L1 pass through the path VD1C1-V6-L1 charge dc bus capacitor C1, in this process, grid power Vs and filter inductor L1 charge dc bus capacitor C1 together, and the energy stored in filter inductor L1 in the previous stage is transferred to 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 switch tube V1 is turned on and the switch tube V2 is turned off, the grid power supply filters through a path L1-V5-V1Inductor L1 is charged, and as shown in FIG. 5, when switch tube V1 is turned off and switch tube V2 is turned on, power grid Vs and filter inductor L1 pass through path L1-V5-C1-VD2The direct-current bus capacitor C1 is charged, in the process, the grid power source Vs and the filter inductor L1 charge the direct-current bus capacitor C1 together, the energy stored in the last stage of the filter inductor L1 is transferred to the direct-current bus capacitor C1, and the process 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 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 (4)
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.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114362569A (en) * | 2021-11-10 | 2022-04-15 | 四川旷谷信息工程有限公司 | Motor train unit ground power supply sharing direct-current bus and control method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114362569A (en) * | 2021-11-10 | 2022-04-15 | 四川旷谷信息工程有限公司 | Motor train unit ground power supply sharing direct-current bus and control method thereof |
| CN114362569B (en) * | 2021-11-10 | 2023-08-15 | 四川旷谷信息工程有限公司 | EMUs ground power supply sharing direct current bus and control method thereof |
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