CN102568799B - 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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- CN102568799B CN102568799B CN201110457739.1A CN201110457739A CN102568799B CN 102568799 B CN102568799 B CN 102568799B CN 201110457739 A CN201110457739 A CN 201110457739A CN 102568799 B CN102568799 B CN 102568799B
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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 present invention relates to electric and electronic technical field, in particular to a kind of phase shifting transformer and the power transfer with this phase shifting transformer.
Background technology
The gas-to electricity of the regenerative resource such as wind power generation, solar power generation, tidal power generation more and more receives the concern of people.The popular feature of these grid-connected power generation system is generating equipment dispersions, single-machine capacity is little, distribution area is wide, output voltage electric current unstable, how the electric energy that these renewable energy power generation equipment produces efficiently, reliably, is at low cost fed back to electrical network, the converting electric energy that generating equipment is produced is for industry, civilian direct three-phase electricity, to be urgent problem in current China and world wide.
A kind of wind power generation electric energy feedback equipment of prior art adopts AC excitation phase-wound rotor double feedback electric engine variable-speed constant-frequency wind power generation system, adopt in this system and be positioned at rotor-side power converter, regulate the AC excitation electric current of double feedback electric engine, make generator unit stator winding send electric energy, and directly feedback enter electrical network.Due to the feature of dual-feeding motor system, generally need low pressure and can the power converter of four quadrant running, as can AC-DC-AC two level converter of four quadrant running, Fig. 1 is that prior art can the schematic diagram of AC-DC-AC two level converter of four quadrant running, as shown in Figure 1, program frequency converter only processes slip power, general rated power is about 1/3rd of generator capacity, and also belong to low volage current transformer, therefore the cost of current transformer, volume reduces greatly, but the problem existing for the program is, because generator adopts phase-wound rotor, and by slip ring AC excitation, generator volume and cost are increased, due to the use of slip ring, cause generator failure rate high, maintenance cost is high.
The another kind of wind power generation electric energy feedback equipment of prior art adopts permanent magnet generator variable-speed constant-frequency wind power generation system.In the program, draught fan impeller drives permanent magnet generator to rotate, the electric energy sent is after the Frequency-variable Modulation of power converter, become the three-phase alternating current mated with electrical network, and feedback enters electrical network, realize variable speed constant frequency generator, Fig. 2 is the schematic diagram of a kind of permanent magnet generator variable-speed constant-frequency wind power generation system of prior art, Fig. 3 is the schematic diagram of the another kind of permanent magnet generator variable-speed constant-frequency wind power generation system of prior art, as Fig. 2, shown in Fig. 3, the program solves the problem of generator reliability in such scheme, whole system operation troubles rate is low, but because in the program, current transformer power is identical with generator power, and need to use a large amount of electrolytic capacitors, therefore current transformer cost is very high, convertor equipment volume is large.Fig. 4 is the schematic diagram that prior art adopts the variable-speed constant-frequency wind power generation system of current source converter, as shown in Figure 4, the system uses half controllable power semiconductor device thyristor, although which cost is lower, but side harmonics is seriously polluted, power factor is low, and also needing additionally increases harmonic decrease devices, and total cost is improved.
As shown in Figure 5, Fig. 5 is the schematic diagram of a kind of inverter circuit of the prior art to common inverter circuit.It is open-minded that inverter circuit is applied to by control switch device in circuit usually, turns off, and makes energy in circuit can two-way flow, realizes current on line side sineization, can be applied to multiple circuit.Phase shifting transformer is applied in high-power current converting device, and secondary can adopt and organize winding more, reduces the voltage of power device; Multiplex design reduces grid side current harmonics, improves the power factor of input side, few to electric network pollution.
In prior art, if many group inverter circuits work simultaneously, under powerful condition, using phase shifting transformer to reduce current on line side harmonic wave, is conventional method.Fig. 6 is the schematic diagram of a kind of phase shifting transformer of the prior art.Phase shifting transformer secondary in Fig. 6 is delta connection, and former limit is star-connection, and secondary adopts the mode of connection of extend-triangle, connects three groups of convertor circuits, and former limit gets access to grid side.Fig. 7 is a kind of winding diagram of phase shifting transformer and convertor circuit in prior art.
Existing phase shifting transformer connection circuit, mostly is the expansion of Fig. 7, namely organizes convertor circuit more, increase the winding of the secondary of phase shifting transformer, but the voltage of each winding of secondary is all identical.If require that vice-side winding is operated in different rated voltages, so existing transformer, then need to increase the quantity of transformer, transformer cost increases, and floor space increases, and wiring on former limit is also complicated.
In relevant technical scheme, harmonic pollution is serious, power factor is low to existing during electrical network feedback electric energy for generating equipment, and when needing the vice-side winding of phase shifting transformer to be operated in different rated voltage, required phase shifting transformer cost is higher, floor space is larger.For these problems, at present effective solution is not yet proposed.
Summary of the invention
Generating equipment is seriously polluted to electrical network feedback electric energy time-harmonic wave, power factor is low to solve in prior art to the object of the present invention is to provide electric energy feedback apparatus, and the problem that the cost of phase shifting transformer is higher, floor space is larger.
To achieve these goals, according to an aspect of the present invention, a kind of phase shifting transformer is provided.
Phase shifting transformer of the present invention comprises former limit winding and multichannel vice-side winding, and every road winding wherein has the output of two or more no-load voltage ratio.
Further, each output in the vice-side winding of every road is corresponding identical with the no-load voltage ratio of each output in other road vice-side winding.
Further, the former limit of described phase shifting transformer is division winding.
Further, the secondary of described phase shifting transformer is extend-triangle connection type.
To achieve these goals, according to an aspect of the present invention, a kind of power transfer is provided.
This power transfer of the present invention comprises rectifier circuit, inverter circuit and phase shifting transformer, wherein, described rectifier circuit, inverter circuit and phase shifting transformer are connected, described rectifier circuit has the port for being connected with the three-phase output end of three phase mains, the phase shifting transformer of described phase shifting transformer according to any one of Claims 1-4.
To achieve these goals, according to an aspect of the present invention, another power transfer is provided.
This power transfer of the present invention comprises dual pulse width modulation three-phase inversion bridge circuit and phase shifting transformer back-to-back, one end of the described three-phase inversion of dual pulse width modulation back-to-back bridge circuit is for connecting power supply or load, the other end is connected with described phase shifting transformer, the phase shifting transformer of described phase shifting transformer according to any one of Claims 1-4.
To achieve these goals, according to an aspect of the present invention, another power transfer is provided.
This power transfer of the present invention comprises multiple single-phase rectifier bridge circuit and multiple three-phase thyristor bridge circuit, and the phase shifting transformer in the present invention, wherein the first input end of multiple single-phase rectifier bridge circuit is used for being connected one to one with each phase output terminal of AC power, and the second input links together; Two inputs of each described three-phase thyristor bridge circuit are connected with two outputs of each described rectifier circuit respectively, or two inputs of each described three-phase thyristor bridge circuit are connected with two outputs of each described rectifier circuit respectively by inductance; The input of described three-phase thyristor bridge circuit is connected with the multichannel vice-side winding of described phase shifting transformer respectively.
Further, this power transfer of the present invention also comprises at least one pulse-width modulation three-phase inversion bridge circuit, its three outputs are respectively via tandem electric inductance or respectively via tandem electric inductance and electric capacity, be connected with three outputs of described three-phase thyristor bridge circuit, or be connected with the multichannel vice-side winding of described phase shifting transformer separately.
According to technical scheme of the present invention, every road winding of the vice-side winding of phase shifting transformer has the output of two or more no-load voltage ratio, thus makes phase shifting transformer secondary have multiple rated voltage.Adopt technical scheme of the present invention, under convertor circuit can be made to be operated in multiple voltage, and save phase shifting transformer floor space and cost.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, and form a application's part, schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is that prior art can the schematic diagram of AC-DC-AC two level converter of four quadrant running;
Fig. 2 is the schematic diagram of a kind of permanent magnet generator variable-speed constant-frequency wind power generation system of prior art;
Fig. 3 is the schematic diagram of the another kind of permanent magnet generator variable-speed constant-frequency wind power generation system of prior art;
Fig. 4 is the schematic diagram that prior art adopts the variable-speed constant-frequency wind power generation system of current source converter;
Fig. 5 is the schematic diagram of a kind of inverter circuit of the prior art;
Fig. 6 is the schematic diagram of a kind of phase shifting transformer of the prior art;
Fig. 7 is a kind of winding diagram of phase shifting transformer and convertor circuit in prior art;
Fig. 8 is the schematic diagram according to the phase shifting transformer structure in the present embodiment;
Fig. 9 is a kind of schematic diagram being applicable to the convertor circuit structure of phase shifting transformer in the present embodiment;
Figure 10 is the schematic diagram that another kind is applicable to the convertor circuit structure of phase shifting transformer in the present embodiment;
Figure 11 is a kind of schematic diagram being applicable to the electric energy feedback circuit structure of phase shifting transformer in the present embodiment.
Embodiment
It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.
Fig. 8 is the schematic diagram according to the phase shifting transformer structure in the present embodiment.
As shown in Figure 8, the phase shifting transformer in the present embodiment comprises former limit winding 81 and vice-side winding 82.There is shown the situation that secondary has three road windings.With existing phase shifting transformer unlike, every road winding of the vice-side winding of the phase shifting transformer in the present embodiment has the output of two or more no-load voltage ratio.Clear for illustrating, only illustrate in figure that vice-side winding has the situation of two groups of outputs, such as, for a road winding 811, its two groups of outputs are respectively output 1 and output 2.Such vice-side winding is just provided with more than one rated voltage, and does not increase number transformer, and compared with use multiple stage phase shifting transformer, the mode floor space in the present embodiment is less, saves transformer cost simultaneously.
The output of the phase shifting transformer in the present embodiment can be draw centre tap from extend-triangle winding, and the rated voltage of the load that extraction location will connect according to output or power supply is determined.Need for output the situation connecting multiphase load or power supply, each output no-load voltage ratio in every road vice-side winding of the vice-side winding 82 in Fig. 8 can be corresponding identical with each output no-load voltage ratio of other road vice-side winding.Such as, in Fig. 8, the no-load voltage ratio of output 1,3,5 is identical, and the no-load voltage ratio of output 2,4,6 is identical, and like this, when original edge voltage is given, vice-side winding has two kinds of rated voltages and is applicable to multiphase load or power supply.
The former limit of phase shifting transformer in the present embodiment can adopt division winding, and Fig. 8 shows trisected form.Adopt division winding can increase the short-circuit impedance of transformer, thus reduce short circuit current.
Below the structure of the power transfer in the present embodiment is made an explanation.The phase shifting transformer in the present embodiment is included in power transfer in the present embodiment.
Fig. 9 is a kind of schematic diagram being applicable to the convertor circuit structure of phase shifting transformer in the present embodiment.
As shown in Figure 9, three-phase electricity source 91 can connect three phase mains such as threephase alternator, and AC three-phase side 92 is connected with the output of the phase shifting transformer in the present embodiment.Can find out, the phase shifting transformer in application the present embodiment, three-phase electricity source 91 can connect the power supply of multiple rated voltage.
Figure 10 is the schematic diagram that another kind is applicable to the convertor circuit structure of phase shifting transformer in the present embodiment.
As shown in Figure 10, the circuit load of dual pulse width modulation PWM inverter bridge or mains side 101 can connect three phase mains or threephase load back-to-back, and AC three-phase side 102 is connected with the output of the phase shifting transformer in the present embodiment.If a few road back-to-back two PWM inverter bridge circuit works simultaneously, also can use the phase shifting transformer in the present embodiment, reach the effect of filtering harmonic wave and reduction volume of transformer.
Figure 11 is a kind of schematic diagram being applicable to the electric energy feedback circuit structure of phase shifting transformer in the present embodiment.
The three-phase thyristor bridge circuit that electric energy feedback circuit in Figure 11 comprises three rectifier circuits and is connected with each rectifier circuit, each rectifier circuit comprises first input end and the second input, in such as, rectifier circuit in dotted line frame 111, first input end and the second input are respectively A point and B point.In this electric energy feedback apparatus shown in Figure 11, the second input of three rectifier circuits links together, and tie point is O point as illustrated in the drawing.Three first input ends of three rectifier circuits in Figure 11 are used for being connected one to one with AC power three-phase output end, and AC power 112 has been shown in Figure 11.This AC power can be the generator of renewable energy system, can be three-phase alternating-current supply, also can be multi-phase AC power.
Rectifier cell in rectifier circuit in Figure 11 can adopt thyristor, also can adopt diode.The situation adopting thyristor has been shown in Figure 11.Adopt the electric energy feedback apparatus shown in Figure 11, can process respectively each output mutually of AC power, therefore by processed each export mutually carry out inversion process after be fed back to electrical network time, contribute to reducing this AC power and produce harmonic pollution to during electrical network feedback electric energy, and contribute to improving the power factor that this AC power is fed back to the electric energy of electrical network.
In fig. 11, the output of each rectifier circuit connects three-phase thyristor bridge circuit, and this three-phase thyristor bridge circuit can be Thyristor Three-phase full-controlled bridge circuit.After connection three-phase thyristor bridge circuit, the electric energy feedback apparatus in Figure 11 can utilize three-phase thyristor bridge circuit to be wherein for further processing to the electric energy that AC power 112 is fed back to electrical network, contributes to improving the quality of power supply.
The input of the three-phase thyristor bridge circuit in Figure 11 is connected with the multichannel vice-side winding of phase shifting transformer respectively, can be specifically be connected to the winding output with identical no-load voltage ratio, thus the quality of power supply being sent to electrical network is improved, and current waveform harmonic wave reduces.
Utilize the electric energy feedback circuit in Figure 11 in conjunction with the phase shifting transformer in the present embodiment by electric energy feedback to electrical network time, can also PWM three-phase inversion bridge circuit be used further to improve the quality of power supply.Three outputs of PWM three-phase inversion bridge circuit respectively via tandem electric inductance or respectively via tandem electric inductance and electric capacity, can be connected with three outputs of the three-phase thyristor bridge circuit in Figure 11, or are connected with the multichannel vice-side winding of phase shifting transformer separately.
As can be seen from the above description, in the present embodiment, every road winding of phase shifting transformer vice-side winding has the output of two or more no-load voltage ratio, thus makes phase shifting transformer secondary have multiple rated voltage.Explain for extend-triangle in the present embodiment, the winding in addition in the present embodiment also can adopt other connected modes.Adopt the technical scheme of the present embodiment, under convertor circuit can be made to be operated in multiple voltage, and save transformer floor space and cost.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. a phase shifting transformer, comprises former limit winding and multichannel vice-side winding, it is characterized in that,
For the multichannel vice-side winding of described phase shifting transformer, every road winding wherein has the output of two or more no-load voltage ratio, wherein, each output in the vice-side winding of every road is corresponding identical with the no-load voltage ratio of each output in other road vice-side winding, the secondary of described phase shifting transformer is extend-triangle connection type, from extend-triangle winding, draw the output of centre tap as the secondary of described phase shifting transformer, the rated voltage of the load that extraction location will connect according to the output of the secondary of described phase shifting transformer or power supply is determined.
2. phase shifting transformer according to claim 1, is characterized in that, the former limit of described phase shifting transformer is division winding.
3. a power transfer, comprises rectifier circuit, inverter circuit and phase shifting transformer, wherein, described rectifier circuit, inverter circuit and phase shifting transformer are connected, described rectifier circuit has the port for being connected with the three-phase output end of three phase mains, it is characterized in that
Described phase shifting transformer is the phase shifting transformer described in claim 1 or 2.
4. a power transfer, comprise dual pulse width modulation three-phase inversion bridge circuit and phase shifting transformer back-to-back, one end of the described three-phase inversion of dual pulse width modulation back-to-back bridge circuit is for connecting power supply or load, and the other end is connected with described phase shifting transformer, it is characterized in that
Described phase shifting transformer is the phase shifting transformer described in claim 1 or 2.
5. a power transfer, is characterized in that, comprising:
Multiple single-phase rectifier bridge circuit;
Multiple three-phase thyristor bridge circuit;
Phase shifting transformer described in claim 1 or 2; Wherein,
The first input end of described multiple single-phase rectifier bridge circuit is used for being connected one to one with each phase output terminal of AC power, and the second input links together;
Two inputs of each described three-phase thyristor bridge circuit are connected with two outputs of each described rectifier circuit respectively, or two inputs of each described three-phase thyristor bridge circuit are connected with two outputs of each described rectifier circuit respectively by inductance;
The input of described three-phase thyristor bridge circuit is connected with the multichannel vice-side winding of described phase shifting transformer respectively.
6. power transfer according to claim 5, it is characterized in that, also comprise at least one pulse-width modulation three-phase inversion bridge circuit, its three outputs are respectively via tandem electric inductance or respectively via tandem electric inductance and electric capacity, be connected with three outputs of described three-phase thyristor bridge circuit, or be connected with the multichannel vice-side winding of described phase shifting transformer separately.
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| CN104052305B (en) * | 2013-03-14 | 2019-01-25 | 通用电气公司 | Power conversion system |
| 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 |
| KR101860725B1 (en) | 2014-02-03 | 2018-07-02 | 존슨 컨트롤스 테크놀러지 컴퍼니 | Multi-pulse constant voltage transformer for a 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 |
| CN115173426B (en) * | 2022-09-08 | 2022-11-18 | 国网智能电网研究院有限公司 | Voltage amplitude phase adjusting device and adjusting method |
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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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