CN102568799A - Phase-shift transformer and electric energy transmission device with same - Google Patents
Phase-shift transformer and electric energy transmission device with same Download PDFInfo
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- CN102568799A CN102568799A CN2011104577391A CN201110457739A CN102568799A CN 102568799 A CN102568799 A CN 102568799A CN 2011104577391 A CN2011104577391 A CN 2011104577391A CN 201110457739 A CN201110457739 A CN 201110457739A CN 102568799 A CN102568799 A CN 102568799A
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Abstract
The invention discloses a phase-shift transformer and an electric energy transmission device with the same, aiming to reduce the floor area of the phase-shift transformer and reduce the cost of the phase-shift transformer. The phase-shift transformer disclosed by the invention comprises a primary winding and multipath secondary windings, wherein each path of winding is provided an output end with more than two kinds of transformation ratios. By the adoption of the technical scheme disclosed by the invention, the secondary sides of the phase-shift transformer can be connected with circuits with multiple voltage classes, and the number of the phase-shift transformer does not need to be increased, so that the floor area and the cost of the phase-shift transformer are reduced.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a phase-shifting transformer and an electric energy transmission device with the same.
Background
The power generation and utilization of renewable energy sources such as wind power generation, solar power generation, tidal power generation and the like are receiving more and more attention. The new energy power generation systems are generally characterized in that power generation equipment is dispersed, the single machine capacity is small, the distribution area is wide, the output voltage and current are unstable, and how to feed back the electric energy generated by the renewable energy power generation equipment to a power grid efficiently, reliably and at low cost to convert the electric energy generated by the power generation equipment into three-phase power which can be directly used for industry and civilian use is a problem which needs to be solved urgently in China and the world at present.
A wind power generation electric energy feedback device in the prior art adopts an alternating current excitation wire-wound rotor double-fed motor variable-speed constant-frequency wind power generation system, and a power converter positioned at a rotor side is adopted in the system to adjust alternating current excitation current of a double-fed motor, so that a stator winding of a generator generates electric energy and the electric energy is directly fed back to a power grid. Due to the characteristics of a doubly-fed generator system, a power converter which is generally required to be low-voltage and capable of operating in four quadrants, such as an ac-dc-ac two-level frequency converter capable of operating in four quadrants, is generally needed, fig. 1 is a schematic diagram of an ac-dc-ac two-level frequency converter capable of operating in four quadrants in the prior art, as shown in fig. 1, the frequency converter only processes slip power, generally has rated power about one third of the capacity of a generator, and also belongs to a low-voltage converter, so that the cost and the volume of the converter are greatly reduced.
Another wind power generation electric energy feedback device in the prior art adopts a permanent magnet generator variable speed constant frequency wind power generation system. In the scheme, a fan impeller drives a permanent magnet generator to rotate, generated electric energy is subjected to frequency conversion modulation of a power converter and then is converted into three-phase alternating current matched with a power grid and fed back into the power grid to realize variable-speed constant-frequency power generation, fig. 2 is a schematic diagram of a variable-speed constant-frequency wind power generation system of the permanent magnet generator in the prior art, and fig. 3 is a schematic diagram of another variable-speed constant-frequency wind power generation system of the permanent magnet generator in the prior art, as shown in fig. 2 and 3, the scheme solves the problem of reliability of the generator in the scheme, the operation failure rate of the whole system is low, but because the power of a converter is the same as the power of the generator in the scheme and a large number of electrolytic capacitors are needed, the cost of. Fig. 4 is a schematic diagram of a variable-speed constant-frequency wind power generation system using a current-mode converter in the prior art, and as shown in fig. 4, the system uses a thyristor which is a semi-controllable power semiconductor device, although the system is low in cost, the harmonic pollution on the network side is serious, the power factor is low, and an additional harmonic treatment device is required to increase the total manufacturing cost.
Fig. 5 shows a conventional inverter circuit, and fig. 5 is a schematic diagram of an inverter circuit in the prior art. The inverter circuit is generally applied to a circuit, and energy in the circuit can flow in two directions by controlling the on and off of a switch device, so that the sine of network side current is realized, and the inverter circuit can be applied to various circuits. The phase-shifting transformer is applied to a high-power converter, and the secondary side can adopt a plurality of groups of windings to reduce the voltage of a power device; the multiple design reduces the current harmonic wave of the power grid side, improves the power factor of the input side and has little pollution to the power grid.
In the prior art, if a plurality of groups of inverter circuits work simultaneously, under the condition of high power, a phase-shifting transformer is used for reducing current harmonics on a network side, which is a common method. Fig. 6 is a schematic diagram of a phase-shifting transformer in the prior art. In fig. 6, the secondary side of the phase-shifting transformer is a triangular connection, the primary side is a star connection, the secondary side adopts an extended triangular connection mode, and is connected with three groups of converter circuits, and the primary side is connected with a power grid side. FIG. 7 is a wiring diagram of a prior art phase shifting transformer and inverter circuit.
The existing phase-shifting transformer wiring circuit is mostly the extension of fig. 7, that is, a plurality of groups of current transformation circuits are added with windings on the secondary side of the phase-shifting transformer, but the voltages of the windings on the secondary side are the same. If the secondary winding is required to work at different rated voltages, the number of transformers is increased, the cost of the transformers is increased, the occupied area is increased, and the wiring on the primary side is complicated in the conventional transformer.
In the related technical scheme, the power generation equipment has serious harmonic pollution and low power factor when feeding back electric energy to a power grid, and when the secondary winding of the phase-shifting transformer needs to work at different rated voltages, the required phase-shifting transformer has higher cost and larger occupied area. No effective solution to these problems has been proposed so far.
Disclosure of Invention
The invention aims to provide an electric energy feedback device to solve the problems that in the prior art, harmonic pollution is serious, power factor is low, cost of a phase-shifting transformer is high, and occupied area is large when power generation equipment feeds electric energy back to a power grid.
To achieve the above object, according to an aspect of the present invention, there is provided a phase shifting transformer.
The phase-shifting transformer comprises a primary winding and a plurality of paths of secondary windings, wherein each path of winding has output ends with more than two transformation ratios.
Further, the transformation ratio of each output end in each secondary winding is the same with that of each output end in other secondary windings.
Further, the primary side of the phase-shifting transformer is a split winding.
Furthermore, the secondary side of the phase-shifting transformer is in a form of extended triangular wiring.
In order to achieve the above object, according to an aspect of the present invention, there is provided an electric power transmission device.
The electric energy transmission device of the invention comprises a rectifier bridge circuit, an inverter circuit and a phase-shifting transformer, wherein the rectifier bridge circuit, the inverter circuit and the phase-shifting transformer are connected in series, the rectifier bridge circuit is provided with a port for connecting with a three-phase output end of a three-phase power supply, and the phase-shifting transformer is the phase-shifting transformer in any one of claims 1 to 4.
To achieve the above object, according to an aspect of the present invention, there is provided still another power transmission device.
The electric energy transmission device comprises a back-to-back double-pulse-width-modulation three-phase inverter bridge circuit and a phase-shifting transformer, wherein one end of the back-to-back double-pulse-width-modulation three-phase inverter bridge circuit is used for being connected with a power supply or a load, the other end of the back-to-back double-pulse-width-modulation three-phase inverter bridge circuit is connected with the phase-shifting transformer, and the phase-shifting transformer is the phase-shifting transformer in any one.
To achieve the above object, according to an aspect of the present invention, there is provided still another power transmission device.
The electric energy transmission device comprises a plurality of single-phase rectifier bridge circuits, a plurality of three-phase fully-controlled bridge circuits and a phase-shifting transformer, wherein the first input ends of the single-phase rectifier bridge circuits are used for being in one-to-one connection with the output ends of the phases of an alternating current power supply, and the second input ends of the single-phase rectifier bridge circuits are connected together; two input ends of each three-phase fully-controlled bridge circuit are respectively connected with two output ends of each rectifier bridge circuit, or two input ends of each three-phase fully-controlled bridge circuit are respectively connected with two output ends of each rectifier bridge circuit through an inductor; and the input end of the three-phase full-control bridge circuit is respectively connected with the multi-path secondary winding of the phase-shifting transformer.
Furthermore, the electric energy transmission device also comprises at least one pulse width modulation three-phase inverter bridge circuit, and three output ends of the pulse width modulation three-phase inverter bridge circuit are respectively connected with three output ends of the three-phase fully-controlled bridge circuit through a series inductor or a series inductor and a capacitor, or are independently connected with multiple secondary windings of the phase-shifting transformer.
According to the technical scheme of the invention, each path of winding of the secondary winding of the phase-shifting transformer is provided with more than two transformation ratios of output ends, so that the secondary side of the phase-shifting transformer has a plurality of rated voltages. By adopting the technical scheme of the invention, the converter circuit can work under various voltages, and the occupied area and the cost of the phase-shifting transformer are saved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a schematic diagram of a prior art AC-DC-AC two-level frequency converter capable of four-quadrant operation;
FIG. 2 is a schematic diagram of a variable speed constant frequency wind power generation system of a permanent magnet generator according to the prior art;
FIG. 3 is a schematic diagram of another prior art variable speed constant frequency wind power generation system of a permanent magnet generator;
FIG. 4 is a schematic diagram of a prior art variable speed constant frequency wind power generation system employing a current mode converter;
FIG. 5 is a schematic diagram of an inverter circuit according to the prior art;
FIG. 6 is a schematic diagram of a phase shifting transformer of the prior art;
FIG. 7 is a wiring diagram of a prior art phase shifting transformer and inverter circuit;
FIG. 8 is a schematic diagram of a phase-shifting transformer structure according to the present embodiment;
FIG. 9 is a schematic diagram of a structure of a converter circuit applicable to the phase-shifting transformer in the present embodiment;
FIG. 10 is a schematic diagram of another inverter circuit structure suitable for use in the phase-shifting transformer of the present embodiment;
fig. 11 is a schematic diagram of an electric energy feedback circuit structure suitable for the phase-shifting transformer in this embodiment.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Fig. 8 is a schematic diagram of a phase-shifting transformer structure according to the present embodiment.
As shown in fig. 8, the phase-shift transformer in this embodiment includes a primary winding 81 and a secondary winding 82. The figure shows a situation where the secondary side has a three-way winding. Different from the existing phase-shifting transformer, each winding of the secondary winding of the phase-shifting transformer in the embodiment has more than two transformation ratio output ends. For clarity, only the secondary winding has two sets of outputs, for example, for one winding 811, output 1 and output 2 are shown. Therefore, the secondary winding has more than one rated voltage, the number of the transformers is not increased, compared with the mode using a plurality of phase-shifting transformers, the mode in the embodiment has the advantages that the occupied area is small, and meanwhile, the cost of the transformers is saved.
The output end of the phase-shifting transformer in this embodiment may be a center tap led out from the edge-extended triangular winding, and the led-out position is determined according to the rated voltage of the load or power supply to which the output end is to be connected. For the case where the output terminal needs to be connected with a multi-phase load or power supply, the output terminal transformation ratio of each secondary winding of the secondary windings 82 in fig. 8 may be the same as the output terminal transformation ratios of the other secondary windings. For example, in fig. 8, the transformation ratios of the output terminals 1, 3 and 5 are the same, and the transformation ratios of the output terminals 2, 4 and 6 are the same, so that the secondary winding has two voltage ratings and is suitable for a multi-phase load or power supply under the condition of a given primary voltage.
The primary side of the phase-shifting transformer in this embodiment may be a split winding, and fig. 8 shows a form of three-split. The use of split windings increases the short circuit impedance of the transformer and thus reduces the short circuit current.
The following explains the structure of the electric power transmission device in the present embodiment. The electric energy transmission device in this embodiment includes the phase-shifting transformer in this embodiment.
Fig. 9 is a schematic diagram of a structure of a converter circuit applicable to the phase-shifting transformer in the present embodiment.
As shown in fig. 9, a three-phase power source side 91 may be connected to a three-phase power source such as a three-phase ac generator, and an ac three-phase side 92 is connected to an output terminal of the phase-shifting transformer in the present embodiment. It can be seen that, with the phase-shifting transformer in this embodiment, the three-phase power supply side 91 can be connected to power supplies of various rated voltages.
Fig. 10 is a schematic diagram of another inverter circuit structure suitable for use in the phase-shifting transformer of the present embodiment.
As shown in fig. 10, the load or power source side 101 of the back-to-back dual PWM inverter bridge circuit can be connected to a three-phase power source or a three-phase load, and the ac three-phase side 102 is connected to the output terminal of the phase-shifting transformer in this embodiment. If several back-to-back double PWM inverter bridge circuits work simultaneously, the phase-shifting transformer in the embodiment can also be used, so that the effects of filtering harmonic waves and reducing the size of the transformer are achieved.
Fig. 11 is a schematic diagram of an electric energy feedback circuit structure suitable for the phase-shifting transformer in this embodiment.
The electric energy feedback circuit in fig. 11 includes three rectifier bridge circuits and a three-phase fully-controlled bridge circuit connected to each rectifier bridge circuit, where each rectifier bridge circuit includes a first input terminal and a second input terminal, for example, in the rectifier bridge circuit in the dashed box 111, the first input terminal and the second input terminal are point a and point B, respectively. In the electric energy feedback device shown in fig. 11, the second input terminals of the three rectifier bridge circuits are connected together, and the connection point is shown as point O in the figure. The three first input terminals of the three rectifier bridge circuits in fig. 11 are used for one-to-one connection with the three-phase output terminals of the ac power supply, and the ac power supply 112 is shown in fig. 11. The alternating current power supply can be a generator of a renewable energy power generation system, a three-phase alternating current power supply or a multi-phase alternating current power supply.
The rectifier elements in the rectifier bridge circuit in fig. 11 may be thyristors or diodes. The case of using thyristors is shown in fig. 11. With the electric energy feedback device shown in fig. 11, each phase output of the ac power supply can be processed separately, so that when each processed phase output is fed back to the power grid after being inverted, it is helpful to reduce harmonic pollution generated when the ac power supply feeds back electric energy to the power grid, and to improve the power factor of the electric energy fed back to the power grid by the ac power supply.
In fig. 11, the output terminal of each rectifier bridge circuit is connected to a three-phase fully-controlled bridge circuit, which may be a thyristor three-phase fully-controlled bridge circuit. After the three-phase fully-controlled bridge circuit is connected, the electric energy feedback device in fig. 11 can further process the electric energy fed back to the power grid by the ac power supply 112 by using the three-phase fully-controlled bridge circuit, which is helpful to improve the quality of the electric energy.
The input terminals of the three-phase fully-controlled bridge circuit in fig. 11 are respectively connected with multiple secondary windings of the phase-shifting transformer, and specifically, the input terminals of the three-phase fully-controlled bridge circuit can be connected to the winding output terminals with the same transformation ratio, so that the quality of electric energy transmitted to a power grid is improved, and current waveform harmonics are reduced.
When the electric energy feedback circuit in fig. 11 is used in combination with the phase-shifting transformer in this embodiment to feed the electric energy back to the power grid, a PWM three-phase inverter bridge circuit may be further used to improve the electric energy quality. The three output ends of the PWM three-phase inverter bridge circuit may be connected to the three output ends of the three-phase fully-controlled bridge circuit in fig. 11 via series inductors or via series inductors and capacitors, respectively, or may be connected to the multi-secondary windings of the phase-shifting transformer separately.
As can be seen from the above description, in the present embodiment, each winding of the secondary winding of the phase-shifting transformer has output terminals with more than two transformation ratios, so that the secondary winding of the phase-shifting transformer has multiple voltage ratings. In this embodiment, an extended triangle is taken as an example for explanation, and in addition, the windings in this embodiment may also adopt other connection modes. By adopting the technical scheme of the embodiment, the converter circuit can work under various voltages, and the occupied area and the cost of the transformer are saved.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A phase-shifting transformer comprises a primary winding and a plurality of secondary windings, and is characterized in that,
and for the multi-path secondary winding of the phase-shifting transformer, each path of winding has more than two transformation ratio output ends.
2. The phase shifting transformer of claim 1, wherein the respective output terminals of each secondary winding are of the same transformation ratio as the respective output terminals of the other secondary windings.
3. The phase shifting transformer of claim 1, wherein the primary side of the phase shifting transformer is a split winding.
4. The phase shifting transformer according to claim 1, wherein the secondary side of the phase shifting transformer is in the form of an extended delta connection.
5. An electric energy transmission device comprises a rectifier bridge circuit, an inverter circuit and a phase-shifting transformer, wherein the rectifier bridge circuit, the inverter circuit and the phase-shifting transformer are connected in series, the rectifier bridge circuit is provided with a port for connecting with a three-phase output end of a three-phase power supply,
the phase-shifting transformer is the phase-shifting transformer of any one of claims 1 to 4.
6. An electric energy transmission device comprises a back-to-back double-pulse width modulation three-phase inverter bridge circuit and a phase-shifting transformer, wherein one end of the back-to-back double-pulse width modulation three-phase inverter bridge circuit is used for connecting a power supply or a load, and the other end is connected with the phase-shifting transformer,
the phase-shifting transformer is the phase-shifting transformer of any one of claims 1 to 4.
7. An electrical energy transfer device, comprising:
a plurality of single-phase rectifier bridge circuits;
a plurality of three-phase fully-controlled bridge circuits;
the phase shifting transformer of any one of claims 1 to 4; wherein,
the first input ends of the single-phase rectifier bridge circuits are used for being in one-to-one connection with the output ends of the phases of the alternating current power supply, and the second input ends of the single-phase rectifier bridge circuits are connected together;
two input ends of each three-phase fully-controlled bridge circuit are respectively connected with two output ends of each rectifier bridge circuit, or two input ends of each three-phase fully-controlled bridge circuit are respectively connected with two output ends of each rectifier bridge circuit through an inductor;
and the input end of the three-phase full-control bridge circuit is respectively connected with the multi-path secondary winding of the phase-shifting transformer.
8. The power transmission device of claim 7, further comprising at least one pulse width modulated three-phase inverter bridge circuit, wherein three output terminals of the inverter bridge circuit are connected to three output terminals of the three-phase fully-controlled bridge circuit via a series inductor or a series inductor and a capacitor, respectively, or are individually connected to multiple secondary windings of the phase-shifting transformer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110457739.1A CN102568799B (en) | 2011-12-30 | 2011-12-30 | Phase-shift transformer and electric energy transmission device with same |
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| CN201110457739.1A CN102568799B (en) | 2011-12-30 | 2011-12-30 | Phase-shift transformer and electric energy transmission device with same |
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| CN103326365A (en) * | 2013-06-26 | 2013-09-25 | 国家电网公司 | Wind power plant harmonic suppression method, wind power generator sets and wind power station |
| CN104052305A (en) * | 2013-03-14 | 2014-09-17 | 通用电气公司 | Power conversion system |
| CN106104996A (en) * | 2014-02-03 | 2016-11-09 | 约翰逊控制技术公司 | Multiple-pulse constant-voltage transformer for the variable speed drive in chiller applications |
| CN114123217A (en) * | 2020-09-01 | 2022-03-01 | 新疆金风科技股份有限公司 | Semi-direct-drive direct-current wind generating set and wind power plant |
| CN114157168A (en) * | 2021-11-15 | 2022-03-08 | 中国科学院电工研究所 | Ultra-high-speed electromagnetic drive power supply system based on power supply current converter and control method |
| WO2024051838A1 (en) * | 2022-09-08 | 2024-03-14 | 国网智能电网研究院有限公司 | Voltage amplitude and phase adjustment apparatus and method, and computer device and storage medium |
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| CN114157168A (en) * | 2021-11-15 | 2022-03-08 | 中国科学院电工研究所 | Ultra-high-speed electromagnetic drive power supply system based on power supply current converter and control method |
| WO2024051838A1 (en) * | 2022-09-08 | 2024-03-14 | 国网智能电网研究院有限公司 | Voltage amplitude and phase adjustment apparatus and method, and computer device and storage medium |
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| CN102568799B (en) | 2015-05-06 |
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Denomination of invention: Phase-shift transformer and electric energy transmission device with same Effective date of registration: 20161017 Granted publication date: 20150506 Pledgee: Beijing ustron Tongsheng financing Company limited by guarantee Pledgor: Xinneng Power (Beijing) Electrical Technology Co., Ltd. Registration number: 2016990000870 |
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