CN219287390U - Purifying power supply device based on cascade H-bridge topology - Google Patents
Purifying power supply device based on cascade H-bridge topology Download PDFInfo
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- CN219287390U CN219287390U CN202223547572.0U CN202223547572U CN219287390U CN 219287390 U CN219287390 U CN 219287390U CN 202223547572 U CN202223547572 U CN 202223547572U CN 219287390 U CN219287390 U CN 219287390U
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Abstract
A purifying power supply device based on cascade H-bridge topology is provided with a phase unit A1, a phase unit A2 and a phase unit A3; the phase A of the three-phase power grid is connected with the voltage end U of the phase unit A1, the phase B of the three-phase power grid is connected with the voltage end U of the phase unit A2, and the phase C of the three-phase power grid is connected with the voltage end U of the phase unit A3; the grounding end N of the phase unit A1, the grounding end N of the phase unit A2 and the grounding end N of the phase unit A3 are connected in parallel; the voltage end u of the phase unit A1 is output to the phase a of the low-voltage power distribution network, the voltage end u of the phase unit A2 is output to the phase b of the low-voltage power distribution network, and the voltage end u of the phase unit A3 is output to the phase c of the low-voltage power distribution network; the end n of the phase unit A1, the end n of the phase unit A2 and the end n of the phase unit A3 are connected in parallel and then led out as a neutral point of the low-voltage distribution network. The utility model can reduce the loss of the power grid, realize unbalanced load adjustment, stabilize output voltage and frequency, achieve the effect of purifying the power supply, have redundancy and enhance the reliability of the system.
Description
Technical Field
The utility model belongs to the field of high-voltage purification power supplies, and particularly relates to a purification power supply device based on cascade H-bridge topology.
Background
With the continuous investment of high-precision technology development and the great development of high-end manufacturing industry, a large number of automatic control equipment, precise instruments and loads in special industries are put into use, and higher requirements on the power quality of a power grid are also put into place while a large amount of power is consumed.
At present, the voltage class of a power grid power supply system mainly comprises 35kV, 10kV and 6kV, the power consumption of a high-end manufacturing enterprise is usually 10kV power supply incoming line, harmonic-free power supply is required, and the three-phase voltage unbalance degree of the power grid is controlled within 1%, so that the power consumption safety and the load rate of equipment are ensured. Therefore, the power supply device is connected to realize the isolation of the power grid, particularly the power supply and the isolation between the three-phase power grid and the three-phase load, and no feasible technical scheme exists at present.
Disclosure of Invention
The utility model aims to provide a purifying power supply device based on cascade H-bridge topology, which realizes power supply and isolation between a three-phase power grid and a three-phase load and improves the reliability of the power grid.
The technical scheme for solving the technical problems is as follows: a purifying power supply device based on cascade H-bridge topology comprises a phase unit A1, a phase unit A2 and a phase unit A3;
the phase A of the three-phase power grid is connected with the voltage end U of the phase unit A1, the phase B of the three-phase power grid is connected with the voltage end U of the phase unit A2, and the phase C of the three-phase power grid is connected with the voltage end U of the phase unit A3;
the grounding end N of the phase unit A1, the grounding end N of the phase unit A2 and the grounding end N of the phase unit A3 are connected in parallel;
the voltage end u of the phase unit A1 is output to the phase a of the low-voltage power distribution network, the voltage end u of the phase unit A2 is output to the phase b of the low-voltage power distribution network, and the voltage end u of the phase unit A3 is output to the phase c of the low-voltage power distribution network;
the end n of the phase unit A1, the end n of the phase unit A2 and the end n of the phase unit A3 are connected in parallel and then led out as a neutral point of the low-voltage distribution network.
As a preferable scheme of the purifying power supply device based on the cascade H-bridge topology, the circuit structures of the phase unit A1, the phase unit A2 and the phase unit A3 are the same;
the circuit structure comprises: the phase reactor comprises a plurality of power modules M, a phase reactor L, a phase resistor R and an access contactor KM;
the voltage ends U1 and V1 of the power modules M are sequentially connected;
the phase resistor R and the access contactor KM are connected in parallel, and the phase resistor R and the access contactor KM after being connected in parallel are connected with the phase reactor L in series.
As a preferred scheme of the purifying power supply device based on the cascade H-bridge topology, the power module M includes a first H-bridge module formed by a diode module T1, a diode module T2, a diode module T3 and a diode module T4;
diode module T1 and diode module T2 form a first leg, and diode module T3 and diode module T4 form a second leg;
the diode module T1 and the diode module T3 are connected in parallel, and the upper ends of the diode module T1 and the diode module T3 are connected into U+;
the diode module T2 and the diode module T4 are connected in parallel, and the lower ends of the diode module T2 and the diode module T4 are connected into U-;
a voltage end U1 is connected between the diode module T1 and the diode module T2, and a voltage end V1 is connected between the diode module T3 and the diode module T4.
As a preferable scheme of the purifying power supply device based on the cascade H bridge topology, a direct current support capacitor C is connected between a voltage end U1 and a voltage end V1;
diode module T1 connects in parallel has IGBT trigger pin g1, diode module T2 connects in parallel has IGBT trigger pin g2, diode module T3 connects in parallel has IGBT trigger pin g3, diode module T4 connects in parallel has IGBT trigger pin g4.
As a preferred scheme of the purifying power supply device based on the cascade H-bridge topology, the power module M further comprises a second H-bridge module formed by a diode module T5, a diode module T6, a diode module T7 and a diode module T8;
the diode module T5 and the diode module T6 form a third bridge arm, and the diode module T7 and the diode module T8 form a fourth bridge arm;
the diode module T5 and the diode module T7 are connected in parallel, and the upper ends of the diode module T5 and the diode module T7 are connected into U+;
the diode module T6 and the diode module T8 are connected in parallel, and the lower ends of the diode module T6 and the diode module T8 are connected into U-;
a voltage end U3 is connected between the diode module T5 and the diode module T6, and a voltage end V3 is connected between the diode module T7 and the diode module T8.
As a preferable scheme of the purifying power supply device based on the cascade H bridge topology, the diode module T5 is connected with the IGBT trigger pin g5 in parallel, the diode module T6 is connected with the IGBT trigger pin g6 in parallel, the diode module T7 is connected with the IGBT trigger pin g7 in parallel, and the diode module T8 is connected with the IGBT trigger pin g8 in parallel.
As a preferable scheme of the purifying power supply device based on the cascade H bridge topology, the purifying power supply device further comprises a transformer T, wherein the primary side of the transformer T is connected with a voltage end U3 and a voltage end V3; the secondary side output of the transformer T is a voltage end U2 and a voltage end V2.
The utility model is provided with a phase unit A1, a phase unit A2 and a phase unit A3; the phase A of the three-phase power grid is connected with the voltage end U of the phase unit A1, the phase B of the three-phase power grid is connected with the voltage end U of the phase unit A2, and the phase C of the three-phase power grid is connected with the voltage end U of the phase unit A3; the grounding end N of the phase unit A1, the grounding end N of the phase unit A2 and the grounding end N of the phase unit A3 are connected in parallel; the voltage end u of the phase unit A1 is output to the phase a of the low-voltage power distribution network, the voltage end u of the phase unit A2 is output to the phase b of the low-voltage power distribution network, and the voltage end u of the phase unit A3 is output to the phase c of the low-voltage power distribution network; the end n of the phase unit A1, the end n of the phase unit A2 and the end n of the phase unit A3 are connected in parallel and then led out as a neutral point of the low-voltage distribution network. The utility model can reduce the loss of the power grid, realize unbalanced load adjustment, stabilize output voltage and frequency, realize high-power-quality power supply, achieve the effect of purifying the power supply, have redundancy and enhance the reliability of the system.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It will be apparent to those skilled in the art from this disclosure that the drawings described below are merely exemplary and that other embodiments may be derived from the drawings provided without undue effort.
The structures, proportions, sizes, etc. shown in the present specification are shown only for the purposes of illustration and description, and are not intended to limit the scope of the utility model, which is defined by the claims, so that any structural modifications, changes in proportions, or adjustments of sizes, which do not affect the efficacy or the achievement of the present utility model, should fall within the scope of the utility model.
Fig. 1 is a schematic diagram of a purifying power supply device based on a cascaded H-bridge topology according to an embodiment of the present utility model;
fig. 2 is a schematic diagram of a phase unit structure in a purifying power supply device based on a cascaded H-bridge topology according to an embodiment of the present utility model;
fig. 3 is a schematic diagram of a power module structure in a purifying power supply device based on a cascaded H-bridge topology according to an embodiment of the present utility model.
Detailed Description
In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model. The present utility model may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the utility model, whereby the utility model is not limited to the specific embodiments disclosed below.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model.
The related art discloses a novel electrified railway purifying power supply device, which comprises an isolation transformer, a phase-shifting transformer and a power unit serial cascading multi-level converter; the isolation transformer is a Scott transformer for converting two-phase electricity into three-phase electricity, the input end of the isolation transformer is connected with the traction power supply system, and the output of the isolation transformer is connected with the phase-shifting transformer; the phase-shifting transformer is a multi-tap phase-shifting transformer, the input end of the phase-shifting transformer is connected with the Scott transformer, and the tap output end of the phase-shifting transformer is connected with the power unit serial cascade multi-level converter; the power unit serial cascade multilevel converter is a three-phase cascade multilevel converter, the rectifying part of the power unit serial cascade multilevel converter is connected with the multi-tap phase-shifting transformer, and the output of the power unit serial cascade multilevel converter outputs stable voltage through the filter circuit. The technology converts railway single-phase power supply into three-phase power through a series inverter, and directly connects the three-phase power grid, so that power supply and isolation protection between the three-phase power grid and a three-phase load cannot be realized.
The related art discloses a railway purifying power supply device based on a high-frequency transformer, which consists of three groups of power circuits with the same structure and passive filtering branches; the power circuit is formed by cascading one or more power units on the input side and the output side respectively, wherein the power units consist of an input rectifying stage, an isolation stage based on a high-frequency transformer and an output inversion stage; the input sides of the three groups of power circuits are cascaded to form single-phase input, and the output sides of the three groups of power circuits form three-phase power supply output through passive filtering branches in a star connection mode. The technology is based on a cascading type purifying power supply of a high-frequency transformer, and is suitable for railway application. The cascade module adopts an H-bridge inversion module and an H-bridge rectification module to combine cascade, and is respectively connected with a three-phase power grid and a railway single-phase power grid to change railway single-phase power into a three-phase power supply, so that power supply and isolation between the three-phase power grid and a three-phase load cannot be realized.
In view of this, referring to fig. 1, 2 and 3, the present embodiment provides a purifying power supply device based on a cascaded H-bridge topology, which includes a phase unit A1, a phase unit A2 and a phase unit A3;
the phase A of the three-phase power grid is connected with the voltage end U of the phase unit A1, the phase B of the three-phase power grid is connected with the voltage end U of the phase unit A2, and the phase C of the three-phase power grid is connected with the voltage end U of the phase unit A3;
the grounding end N of the phase unit A1, the grounding end N of the phase unit A2 and the grounding end N of the phase unit A3 are connected in parallel;
the voltage end u of the phase unit A1 is output to the phase a of the low-voltage power distribution network, the voltage end u of the phase unit A2 is output to the phase b of the low-voltage power distribution network, and the voltage end u of the phase unit A3 is output to the phase c of the low-voltage power distribution network;
the end n of the phase unit A1, the end n of the phase unit A2 and the end n of the phase unit A3 are connected in parallel and then led out as a neutral point of the low-voltage distribution network.
In this embodiment, the circuit structures of the phase unit A1, the phase unit A2, and the phase unit A3 are the same; the circuit configuration of the phase cell, which aids in fig. 2, includes: 9 power modules M1-M9, a phase reactor L, a phase resistor R and an access contactor KM; after being led out of the phase reactor L as U and connected with a starting loop, the voltage end U1 of the power module M1 is connected with an external power grid, the voltage end V1 of the power module M1 is connected with the voltage end U1 of the power module M2, the voltage end V1 of the power module M2 is connected with the voltage end U1 of the power module M3 until the voltage end U1 of the power module M9 is led out, and the voltage end V2 of the power module M9 is equivalent to N.
The power modules M1-M9 are used for energy conversion; the phase reactor L is used for connecting the power modules M1-M9 in cascade and then directly hanging into a power grid system; the phase resistor R is used for suppressing inrush current at the moment of starting the equipment, and the access contactor KM is used for completing bypass phase resistor after the power supply purifying device is started.
FIG. 3 is assisted, in this embodiment, the power module includes a first H-bridge module formed by diode module T1, diode module T2, diode module T3 and diode module T4; diode module T1 and diode module T2 form a first leg, and diode module T3 and diode module T4 form a second leg; the diode module T1 and the diode module T3 are connected in parallel, and the upper ends of the diode module T1 and the diode module T3 are connected into U+; the diode module T2 and the diode module T4 are connected in parallel, and the lower ends of the diode module T2 and the diode module T4 are connected into U-; a voltage end U1 is connected between the diode module T1 and the diode module T2, and a voltage end V1 is connected between the diode module T3 and the diode module T4. A direct current support capacitor C is connected between the voltage end U1 and the voltage end V1; diode module T1 connects in parallel has IGBT trigger pin g1, diode module T2 connects in parallel has IGBT trigger pin g2, diode module T3 connects in parallel has IGBT trigger pin g3, diode module T4 connects in parallel has IGBT trigger pin g4.
Wherein g1, g2, g3 and g4 are trigger signal pins of the IGBTs in the anti-parallel diode modules T1, T2, T3 and T4 respectively, and are used for controlling the on and off of the IGBTs by the controller. The direct current support capacitor C between the U+ and the U-is used for direct current voltage stabilization, and provides a channel for reactive power of the system to stabilize input and output voltages. Wherein the rated voltage range of the direct current side is 900V-1000V, the overvoltage alarm is performed at 1200V-1300V, and the overvoltage tripping protection is performed at 1500V-1600V. The low voltage alarm is 800V-850V, and the low voltage is switched to 450V-500V.
Auxiliary fig. 3, in this embodiment, the power module further includes a second H-bridge module formed by a diode module T5, a diode module T6, a diode module T7, and a diode module T8; the diode module T5 and the diode module T6 form a third bridge arm, and the diode module T7 and the diode module T8 form a fourth bridge arm; the diode module T5 and the diode module T7 are connected in parallel, and the upper ends of the diode module T5 and the diode module T7 are connected into U+; the diode module T6 and the diode module T8 are connected in parallel, and the lower ends of the diode module T6 and the diode module T8 are connected into U-; a voltage end U3 is connected between the diode module T5 and the diode module T6, and a voltage end V3 is connected between the diode module T7 and the diode module T8. The diode module T5 is connected with the IGBT trigger pin g5 in parallel, the diode module T6 is connected with the IGBT trigger pin g6 in parallel, the diode module T7 is connected with the IGBT trigger pin g7 in parallel, and the diode module T8 is connected with the IGBT trigger pin g8 in parallel.
And g5, g6, g7 and g8 are trigger signal pins of the IGBTs in the anti-parallel diode module T5, the diode module T6, the diode module T7 and the diode module T8 respectively and are used for controlling the on and off of the IGBTs by the module trigger controller. The module trigger controller is used for taking electricity from the U+ and U-of the direct-current support capacitor C, monitoring direct-current side voltage and receiving an optical fiber control instruction of the upper-level power supply controller, and sending a trigger command.
In this embodiment, the transformer T is further included, and a primary side of the transformer T is connected to the voltage terminal U3 and the voltage terminal V3; the secondary side output of the transformer T is a voltage end U2 and a voltage end V2. The transformer T is single-phase, the primary side is connected into the voltage end U3 and the voltage end V3, the secondary side output is the voltage end U2 and the voltage end V2, the transformer T is used for power isolation, filtering and waveform arrangement, and the transformer T and an H bridge formed by the diode module T5, the diode module T6, the diode module T7 and the diode module T8 are used for realizing waveform control of an output power supply, wherein the transformer transformation ratio is 200V to 400V.
According to the technical scheme, 9 power modules are connected in series to a 10V network for obtaining electric energy in the primary three-phase, the output of the secondary side is connected in parallel to a 380V power distribution network for supplying power to equipment, the manufacturing difficulty of the power modules is reduced in the primary side through the power modules connected in series, harmonic-free and high-power factor input with a power grid is achieved through phase modulation control, and loss of the power grid is reduced. The output side adopts a plurality of modules of the power module to be connected in parallel, so that the redundancy is realized, and the reliability of the system is enhanced. Under a normal working mode, a purifying power supply device is started, the 10kV power grid side of the purifying power supply device follows power grid fluctuation, and the power factor of the power grid side access is improved; meanwhile, according to the load, unbalanced output and voltage and frequency output of the 400V load side of the purifying power supply device are adjusted, so that the power quality requirement of power supply equipment is met. When the 10kV network side power module fails, the output can be adjusted, the 400V bus is followed to serve as a bypass of a load power supply line, and the original transformer of the power distribution network is adopted to supply power, so that the reliability is further provided. The utility model has bidirectional power flow, can realize real-time adjustment of the power of the primary side and the secondary side, automatic three-phase unbalanced load adjustment, stable output voltage and frequency, realize high-power-quality power supply and achieve the effect of purifying the power supply.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.
Claims (7)
1. The purifying power supply device based on the cascade H bridge topology is characterized by comprising a phase unit A1, a phase unit A2 and a phase unit A3;
the phase A of the three-phase power grid is connected with the voltage end U of the phase unit A1, the phase B of the three-phase power grid is connected with the voltage end U of the phase unit A2, and the phase C of the three-phase power grid is connected with the voltage end U of the phase unit A3;
the grounding end N of the phase unit A1, the grounding end N of the phase unit A2 and the grounding end N of the phase unit A3 are connected in parallel;
the voltage end u of the phase unit A1 is output to the phase a of the low-voltage power distribution network, the voltage end u of the phase unit A2 is output to the phase b of the low-voltage power distribution network, and the voltage end u of the phase unit A3 is output to the phase c of the low-voltage power distribution network;
the end n of the phase unit A1, the end n of the phase unit A2 and the end n of the phase unit A3 are connected in parallel and then led out as a neutral point of the low-voltage distribution network.
2. The purifying power supply device based on the cascade H-bridge topology according to claim 1, wherein the circuit structures of the phase unit A1, the phase unit A2, and the phase unit A3 are identical;
the circuit structure comprises: the phase reactor comprises a plurality of power modules M, a phase reactor L, a phase resistor R and an access contactor KM;
the voltage ends U1 and V1 of the power modules M are sequentially connected;
the phase resistor R and the access contactor KM are connected in parallel, and the phase resistor R and the access contactor KM after being connected in parallel are connected with the phase reactor L in series.
3. The purifying power supply device based on the cascade H-bridge topology according to claim 2, wherein the power module M comprises a first H-bridge module formed by a diode module T1, a diode module T2, a diode module T3 and a diode module T4;
diode module T1 and diode module T2 form a first leg, and diode module T3 and diode module T4 form a second leg;
the diode module T1 and the diode module T3 are connected in parallel, and the upper ends of the diode module T1 and the diode module T3 are connected into U+;
the diode module T2 and the diode module T4 are connected in parallel, and the lower ends of the diode module T2 and the diode module T4 are connected into U-;
a voltage end U1 is connected between the diode module T1 and the diode module T2, and a voltage end V1 is connected between the diode module T3 and the diode module T4.
4. The purifying power supply device based on the cascade H-bridge topology according to claim 3, wherein a direct current support capacitor C is connected between the voltage terminal U1 and the voltage terminal V1;
diode module T1 connects in parallel has IGBT trigger pin g1, diode module T2 connects in parallel has IGBT trigger pin g2, diode module T3 connects in parallel has IGBT trigger pin g3, diode module T4 connects in parallel has IGBT trigger pin g4.
5. The purifying power supply device based on the cascade H-bridge topology according to claim 4, wherein the power module M further comprises a second H-bridge module formed by a diode module T5, a diode module T6, a diode module T7 and a diode module T8;
the diode module T5 and the diode module T6 form a third bridge arm, and the diode module T7 and the diode module T8 form a fourth bridge arm;
the diode module T5 and the diode module T7 are connected in parallel, and the upper ends of the diode module T5 and the diode module T7 are connected into U+;
the diode module T6 and the diode module T8 are connected in parallel, and the lower ends of the diode module T6 and the diode module T8 are connected into U-;
a voltage end U3 is connected between the diode module T5 and the diode module T6, and a voltage end V3 is connected between the diode module T7 and the diode module T8.
6. The purifying power supply device based on the cascade H-bridge topology according to claim 5, wherein the diode module T5 is connected in parallel with the IGBT trigger pin g5, the diode module T6 is connected in parallel with the IGBT trigger pin g6, the diode module T7 is connected in parallel with the IGBT trigger pin g7, and the diode module T8 is connected in parallel with the IGBT trigger pin g8.
7. The purifying power supply device based on the cascade H-bridge topology according to claim 6, further comprising a transformer T, a primary side of the transformer T being connected to the voltage terminal U3 and the voltage terminal V3; the secondary side output of the transformer T is a voltage end U2 and a voltage end V2.
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