CN202435291U - PFC Boost Circuit with Adjustable Carrier Amplitude - Google Patents
PFC Boost Circuit with Adjustable Carrier Amplitude Download PDFInfo
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- CN202435291U CN202435291U CN2011205617565U CN201120561756U CN202435291U CN 202435291 U CN202435291 U CN 202435291U CN 2011205617565 U CN2011205617565 U CN 2011205617565U CN 201120561756 U CN201120561756 U CN 201120561756U CN 202435291 U CN202435291 U CN 202435291U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
本实用新型公开一种载波幅值可调的PFC升压电路，包括风电机组、变压器、单位功率因数电路，风电机组的输出端与变压器的三个交流输入端相连。变压器为SCOTT变压器，变压器的四个交流输出端与单位功率因数电路的四个交流输入端对应相连；单位功率因数电路包括两个PFC功率电路和一个PFC控制电路，两个PFC功率电路的输出端并联或串联，输出直流电压；采用载波幅值可调的控制电路，产生的PWM脉冲驱动两个功率开关。本实用新型输出稳定的直流电压，同时在机侧产生单位输入功率因数，实现灵活的调压能力，克服风速较低时风电机组待机的不足，另外直流侧两个PFC功率电路输出并联，提高功率等级，通用性强，结构简单。
The utility model discloses a PFC step-up circuit with adjustable carrier wave amplitude, which comprises a wind turbine, a transformer and a unit power factor circuit. The output terminal of the wind turbine is connected with three AC input terminals of the transformer. The transformer is a SCOTT transformer, and the four AC output terminals of the transformer are correspondingly connected with the four AC input terminals of the unit power factor circuit; the unit power factor circuit includes two PFC power circuits and a PFC control circuit, and the output terminals of the two PFC power circuits Connect in parallel or in series, output DC voltage; use a control circuit with adjustable carrier amplitude, and generate PWM pulses to drive two power switches. The utility model outputs a stable DC voltage, and at the same time generates a unit input power factor on the machine side, realizes flexible voltage regulation capability, and overcomes the shortage of wind turbine standby when the wind speed is low. In addition, the output of two PFC power circuits on the DC side is connected in parallel to increase power. Level, strong versatility, simple structure.
Description
Technical field
The utility model relates to a kind of AC/DC converter of wind power generation electric and electronic technical field, specifically is the adjustable PFC booster circuit of carrier amplitude.
Background technology
Along with the development of China's intelligent grid, solar power generation, wind power generation and the small power station's ratio of distributed electricity generation system in whole energy resource structure progressively rise.The permanent magnet synchronous wind generator group is as a kind of important wind power generation form, and the structure of rectification and boost chopper is not controlled in the many employings of its pusher side.Because diode is not controlled the nonlinear characteristic of rectifier bridge, will make the pusher side electric current that serious distortion takes place, produce torque pulsation, increase power loss, reduce unit durability, reduce system effectiveness.In addition, when wind speed was generally low, direct drive permanent magnetic synchronous generator rotating speed was also lower, and it is not high to send voltage, will make the wind-powered electricity generation unit be in holding state, reduces system effectiveness.And the adjustable pfc circuit of carrier amplitude can make dc voltage raise in the wind power generation, improved efficiency, because its circuit is simple, control is easy, and effect is remarkable, has a good application prospect.
In sum, traditional wind turbine generator efficient is low, and complex structure, pusher side adopt diode not control rectifier bridge, and harmonic wave is bigger, and loss is many, and wind speed can cause the unit standby when low, can't satisfy the efficient requirement of wind power generation.Along with the expansion of practical application, the wind turbine generator that designs a kind of simple in structure, complete function, high input power factor has become this area researcher's the task of top priority.
The utility model content
The utility model provides a kind of carrier amplitude adjustable PFC booster circuit to the above-mentioned deficiency of prior art, makes it reach the unit input power factor, reduces current harmonics, improves output voltage, has simple in structurely, and control is easy to advantage.
The utility model is realized through following technical scheme; The utility model comprises: wind-powered electricity generation unit, transformer, unity power factor circuit; The output of wind-powered electricity generation unit links to each other with the input of transformer, and the output of transformer links to each other with the input of unity power factor circuit.
Described wind-powered electricity generation unit is the permanent magnet synchronous wind generator group.
The permanent magnet synchronous wind generator group of described magneto alternator group for directly driving, output links to each other with the input of transformer.
Described transformer is the SCOTT transformer, and four ac output end of SCOTT transformer link to each other respectively at four AC input terminals of unity power factor circuit.
Described unity power factor circuit comprises two PFC power circuits and PFC control circuit.
Described PFC power circuit is the pfc circuit of BOOST boost chopper, output parallel connection or series connection, output high voltage direct current.
Described PFC control circuit is the circuit of power factor correction that carrier amplitude changes; The actual value of output dc voltage reference value and two pfc circuits is subtracted each other through subtracter, and after amplifying through error-filter, outer voltage produces controlled quentity controlled variable; Again through multiplier and standard sawtooth carrier multiplication; Obtain the sawtooth carrier wave of Variable Amplitude, compare with each inductive current that detects and then and produce original set pulse, send into two rest-set flip-flops (bistable trigger) respectively; The reset terminal of rest-set flip-flop receives with accurate sawtooth and carries synchronous reset signal simultaneously, finally obtains the two-way driving pulse.
In the utility model, the parallel connection of the output of two PFC power circuits, the power output grade of raising PFC power circuit.The output series connection of two PFC power circuits, the output voltage values of raising PFC power circuit.The dc bus current of PFC control circuit sampling and outputting voltage, a PFC power circuit and the 2nd PFC power circuit; Output pwm pulse under the control of the PFC of adjustable amplitude value control circuit; Be input to the driver of two PFC power circuits respectively; Two drivers drive two power devices respectively, make two all to work under the unity power factor state mutually, thereby the generating pusher side also work in the unity power factor state.After voltage process SCOTT transformer and BOOST boost chopper boosted, voltage was higher, the combining inverter operate as normal of level after making, thus form the PFC rectification circuit in the permanent magnet synchronous wind generator group.
The utility model can be transformed to the principle that the alternating voltage, PFC boost chopper of two phase quadratures can the unit's of acquisition input power factor with three-phase alternating voltage according to the SCOTT transformer; Formulate the PFC rectification circuit in the permanent magnet synchronous wind generator group, can realize the output of low-voltage alternating-current input-HVDC, and obtained unity power factor; It is lower to overcome direct drive permanent magnetic synchronous generator voltage; The shortcoming that can not under low wind speed, move is fit to the permanent magnet synchronous direct-drive wind power generator group, and it is simple to have circuit design; Advantages such as control is convenient have important use to be worth.The booster circuit of Single-phase PFC output-parallel has characteristics such as project organization novelty in the utility model wind power generation, has grade simple in structure simultaneously a bit.
Description of drawings
Fig. 1 is the circuit theory diagrams of the utility model embodiment 1;
Fig. 2 is the circuit theory diagrams of the utility model embodiment 2.
Embodiment
Embodiment in the face of the utility model elaborates down; Present embodiment is being to implement under the prerequisite with the utility model technical scheme; Provided detailed execution mode and concrete operating process, but the protection range of the utility model is not limited to following embodiment.
As shown in Figure 1; Present embodiment provides the booster circuit of Single-phase PFC output-parallel in a kind of wind power generation; Comprise wind-powered electricity generation unit 1, transformer 2, unity power factor circuit; The output of wind-powered electricity generation unit links to each other with three ac input ends of SCOTT transformer, and four ac output ends of SCOTT transformer link to each other with four ac input ends of unity power factor circuit, and the output of unity power factor circuit is a high voltage direct current.
Described wind-powered electricity generation unit comprises parts such as the wind energy conversion system Tu1 that forms the permanent magnet synchronous wind generator group, mechanical axis, permanent magnet synchronous wind generator MG1, and the output of permanent magnet synchronous wind generator links to each other with three ac input ends of SCOTT transformer.
Described wind energy conversion system Tu1 is the variable pitch wind energy conversion system.
Described permanent magnet synchronous wind generator is permagnetic synchronous motor commonly used.
Described transformer 2 is the SCOTT transformer.
Described unity power factor circuit comprises two PFC power circuits 3,4 and PFC control circuit 5.
Described PFC power circuit 3 comprises that filter capacitor C1, diode do not control rectifier bridge B1, boost inductance L1, power device S1, diode D1, driver Dr1, electrochemical capacitor E1, steady resistance R1, flow measurement resistance R 3.
Described PFC power circuit 4 comprises that filter capacitor C2, diode do not control rectifier bridge B2, boost inductance L2, power device S2, diode D2, driver Dr2, electrochemical capacitor E2, steady resistance R2, flow measurement resistance R 4.
The output parallel connection of described PFC power circuit 3 and PFC power circuit 4, output dc voltage.
Described PFC control circuit is the circuit of power factor correction that carrier amplitude changes.The actual value of output dc voltage reference value and two PFC power circuits is subtracted each other through subtracter, and after amplifying through error-filter, outer voltage produces controlled quentity controlled variable; Again through multiplier and standard sawtooth carrier multiplication; Obtain the sawtooth carrier wave of Variable Amplitude, compare with each inductive current that detects and then and produce original set pulse, send into two bistable triggers respectively; The reset terminal of trigger receives with accurate sawtooth and carries synchronous reset signal simultaneously, finally obtains the two-way driving pulse.
Described capacitor C 1, C2 are ac capacitor, low-pressure type, 2.0 μ F/1200V.
Describedly do not control rectifier bridge B1, B2 is that diode is not controlled rectifier bridge.
Described boost inductance L1, L2 are amorphous material, adopt planar structure, and the sense value is 750 μ H.
Described power device S1, S2 are IGBT 1200V/75A/100 ℃, and switching frequency is 10kHz.
Described diode D1, D2 are reverse fast recovery type diode.
Described driver Dr1, Dr2 are the IGBT integrated drive.
Described electrochemical capacitor E1, E2 are alminium electrolytic condenser, two and two go here and there single parameter 2200 μ F/450V separately.
Described steady resistance R1, R2 are plug-in unit resistance, and resistance is 120k Ω/5W.
Described flow measurement resistance R 3, R4 are cement resistor, and resistance is 0.015 Ω.
In the present embodiment, the input wind speed is 2～20m/s, and the wind machine oar leaf radius is 15m, and output dc voltage is 690V, and peak power output is 20kW.All components and parts all adopt high accuracy.
Present embodiment carries out work in the following manner: wind-force unit 1 becomes mechanical energy to pass through arbor driving magneto alternator wind energy transformation; Generator converts mechanical energy to electric energy; Output three-phase alternating current sinusoidal voltage; Three-phase symmetrical alternating current sinusoidal voltage is input to three three-phase alternating current input terminals of SCOTT transformer 2; By the ac sinusoidal voltage of two mutually orthogonals of four two cross streams lead-out terminal output, this two phase voltage outputs to the input of two identical PFC power circuits 3,4 respectively.In first PFC power circuit 3; First phase voltage through the first filter capacitor filtering after; Output to two AC input terminals of the uncontrollable rectifier bridge of first diode; Two dc terminal output dc voltages obtain higher direct voltage behind the BOOST boost chopper of this voltage through first boost inductance, first power device, first diode and first electric capacity of voltage regulation formation.In second PFC power circuit 4; Second phase voltage through the second filter capacitor filtering after; Output to two AC input terminals of the uncontrollable rectifier bridge of second diode; Two sub-output dc voltages of dc output end obtain higher direct voltage behind the BOOST boost chopper of this voltage through second boost inductance, second power device, second diode and second electric capacity of voltage regulation formation.The dc bus current of PFC control circuit 5 sampling and outputting voltages, a PFC power circuit 3 and the 2nd PFC power circuit 4; Output pwm pulse under the control of the PFC of adjustable amplitude value control circuit 5; Be input to the driver of two PFC power circuits 3,4 respectively; Two drivers drive two power devices respectively, make two all to work under the unity power factor state mutually, thereby the generating pusher side also work in the unity power factor state.After voltage process SCOTT transformer and BOOST boost chopper boosted, voltage was higher, the combining inverter operate as normal of level after making, thus form the PFC rectification circuit in the permanent magnet synchronous wind generator group.
As shown in Figure 2; Present embodiment provides the booster circuit of Single-phase PFC output series connection in a kind of wind power generation; Comprise wind-powered electricity generation unit 1, transformer 2, unity power factor circuit; The output of wind-powered electricity generation unit links to each other with three ac input ends of SCOTT transformer, and four ac output ends of SCOTT transformer link to each other with four ac input ends of unity power factor circuit, and the output of unity power factor circuit is a high voltage direct current.
Different with embodiment 1 is:
(1) in the present embodiment, the series connection of the output of PFC power circuit, output dc voltage is adapted at generator operation under the lower wind speed at double;
(2) the PFC power circuit is revised, and has comprised an equalizing lattice network, be provided with before this equalizing lattice network two voltage ratios, the error filter amplifier, can so that the output of PFC power circuit all press.
In the present embodiment, the input wind speed is 2～20m/s, and the wind machine oar leaf radius is 15m, and output dc voltage is 690V, and peak power output is 20kW.All components and parts all adopt high accuracy.Other do not have the content of explanation all can adopt embodiment 1 said mode.
The three-phase symmetric voltage that the utility model adopts the SCOTT transformer that wind turbine generator is sent is transformed to two phase quadrature voltages, realizes 3/2 conversion of voltage, adopt again two independently this biphase current of PFC control respectively with two phase voltage same-phases; Has unity power factor simultaneously; According to the characteristic of SCOTT transformer, can obtain three symmetrical and the synchronous electric currents of three-phase voltage at pusher side, the entire circuit structure is very simple simultaneously; It is few to detect electric weight and controlled electric weight; Control circuit uses the adjustable method of carrier amplitude, and is simple in structure, obtained simulation analysis and experiment preliminary identification.Voltage obtains high voltage through SCOTT transformer and PFC boost chopper; The SCOTT transformer also can be designed to step-up transformer; The wind-powered electricity generation unit also can be worked under low wind speed, and direct voltage parallel connection or series connection after the two phase voltage rectifications can improve power output grade or magnitude of voltage.And the deficiency of existing scheme is: (1) pusher side adopts diode not control rectifier bridge, and current harmonics is big, can not realize the unity power factor of pusher side, causes the generator torque pulsation.Generator for electricity generation voltage was lower when (2) wind speed was low, only adopted the one-level DC voltage booster circuit not address this problem fully.Can not adapt to the requirement of intelligent grid.
Although the content of the utility model has been done detailed introduction through above-mentioned preferred embodiment, will be appreciated that above-mentioned description should not be considered to the restriction to the utility model.After those skilled in the art have read foregoing, for the multiple modification of the utility model with to substitute all will be conspicuous.Therefore, the protection range of the utility model should be limited appended claim.
Claims (6)
1. PFC booster circuit that carrier amplitude is adjustable; Comprise: wind-powered electricity generation unit, transformer, unity power factor circuit; The output of wind-powered electricity generation unit links to each other with the input of transformer; The output of transformer links to each other with the input of unity power factor circuit, it is characterized in that: described wind-powered electricity generation unit is the permanent magnet synchronous wind generator group; Described unity power factor circuit is two PFC power circuits and a PFC control circuit, and the input of two PFC power circuits connects the transformer output, the output parallel connection or the series connection of two PFC power circuits, output dc voltage; Described PFC control circuit is the circuit of power factor correction that carrier amplitude changes.
2. the PFC booster circuit that carrier amplitude according to claim 1 is adjustable is characterized in that, the permanent magnet synchronous wind generator group of described magneto alternator group for directly driving, and output links to each other with the input of transformer.
3. the PFC booster circuit that carrier amplitude according to claim 1 is adjustable is characterized in that, described transformer is the SCOTT transformer, and four ac output end of SCOTT transformer link to each other respectively at four AC input terminals of unity power factor circuit.
4. the PFC booster circuit that carrier amplitude according to claim 1 is adjustable is characterized in that, described PFC power circuit is the pfc circuit of BOOST boost chopper.
5. the PFC booster circuit adjustable according to each described carrier amplitude of claim 1-4 is characterized in that, described PFC control circuit; The actual value of output dc voltage reference value and two PFC power circuits is subtracted each other through subtracter, and after amplifying through error-filter, outer voltage produces controlled quentity controlled variable; Again through multiplier and standard sawtooth carrier multiplication; Obtain the sawtooth carrier wave of Variable Amplitude, compare with each inductive current that detects and then and produce original set pulse, send into two rest-set flip-flops respectively; The reset terminal of rest-set flip-flop receives with accurate sawtooth and carries synchronous reset signal simultaneously, finally obtains the two-way driving pulse.
6. the PFC booster circuit adjustable according to each described carrier amplitude of claim 1-4; It is characterized in that; When the output of two PFC power circuits is connected; Said PFC control circuit further comprises an equalizing lattice network, be provided with before this equalizing lattice network two voltage ratios, the error filter amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205617565U CN202435291U (en) | 2011-12-28 | 2011-12-28 | PFC Boost Circuit with Adjustable Carrier Amplitude |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205617565U CN202435291U (en) | 2011-12-28 | 2011-12-28 | PFC Boost Circuit with Adjustable Carrier Amplitude |
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| CN202435291U true CN202435291U (en) | 2012-09-12 |
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| CN2011205617565U Expired - Fee Related CN202435291U (en) | 2011-12-28 | 2011-12-28 | PFC Boost Circuit with Adjustable Carrier Amplitude |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104218857A (en) * | 2014-08-19 | 2014-12-17 | 广东威灵电机制造有限公司 | Air conditioner and method and system for controlling starting of outdoor fans of air conditioner |
| CN105939121A (en) * | 2015-11-23 | 2016-09-14 | 中国矿业大学 | Wind generator current-adjustment and phase-modulation control-based parallel DCM Boost PFC converter |
| CN108233410A (en) * | 2018-01-08 | 2018-06-29 | 湖南工业大学 | Source of resistance high-speed engine grid-connected system and its control method based on distributed PFC rectifications |
| CN108735463A (en) * | 2017-04-13 | 2018-11-02 | 株洲中车时代电气股份有限公司 | A kind of Scott Connection Traction Transformers |
| CN114499216A (en) * | 2022-04-13 | 2022-05-13 | 国网智能电网研究院有限公司 | A voltage regulated power supply |
-
2011
- 2011-12-28 CN CN2011205617565U patent/CN202435291U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104218857A (en) * | 2014-08-19 | 2014-12-17 | 广东威灵电机制造有限公司 | Air conditioner and method and system for controlling starting of outdoor fans of air conditioner |
| CN104218857B (en) * | 2014-08-19 | 2017-10-31 | 广东威灵电机制造有限公司 | A kind of air conditioner and its outdoor fan method for starting-controlling and system |
| CN105939121A (en) * | 2015-11-23 | 2016-09-14 | 中国矿业大学 | Wind generator current-adjustment and phase-modulation control-based parallel DCM Boost PFC converter |
| CN108735463A (en) * | 2017-04-13 | 2018-11-02 | 株洲中车时代电气股份有限公司 | A kind of Scott Connection Traction Transformers |
| CN108233410A (en) * | 2018-01-08 | 2018-06-29 | 湖南工业大学 | Source of resistance high-speed engine grid-connected system and its control method based on distributed PFC rectifications |
| CN114499216A (en) * | 2022-04-13 | 2022-05-13 | 国网智能电网研究院有限公司 | A voltage regulated power supply |
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Granted publication date: 20120912 Termination date: 20121228 |