CN102347612A - Commercial power parallel type power converting circuit and power converting method thereof - Google Patents
Commercial power parallel type power converting circuit and power converting method thereof Download PDFInfo
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- CN102347612A CN102347612A CN2010102423892A CN201010242389A CN102347612A CN 102347612 A CN102347612 A CN 102347612A CN 2010102423892 A CN2010102423892 A CN 2010102423892A CN 201010242389 A CN201010242389 A CN 201010242389A CN 102347612 A CN102347612 A CN 102347612A
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Abstract
The invention relates to a commercial power parallel type power converting circuit and a power converting method thereof. According to the commercial power parallel type power converting method, renewable energy is boosted to stable and fixed direct current power by utilizing a direct current/direct current converter, the direct current power is converted into alternating current by utilizing a direct current/alternating current converter, according to a corresponding feedback signal of direct current, a responsibility period of the direct current/direct current converter is regulated and controlled in order to stabilize output of the direct current/direct current converter. In addition, according to a corresponding feedback signal of alternating current and by utilizing a wave angular position processor, an angular position of commercial power is detected to regulate and control a responsibility period of the direct current/alternating current converter, thus the direct current/alternating current converter outputs alternating power of a synchronous frequency with the commercial power. When renewable energy power is insufficient, the commercial power is utilized to supply part power, and frequency of the alternating power is synchronous with commercial power frequency. Simultaneously, the invention also provides the commercial power parallel type power converting circuit.
Description
Technical field
The present invention relates to a kind of civil power parallel technology, particularly relate to a kind of civil power parallel connection type power conversion circuit and power transferring method thereof.
Background technology
" renewable energy resources " (Renewable energy) is meant in theory can inexhaustible natural resources; Can not produce pollutant in the use; For example solar energy, wind energy, geothermal energy, hydraulic energy, tidal energy, living mass-energy etc. all are to transform natural energy to become the energy.With the general people's livelihood power supply of converting into of renewable energy resources efficient and cost-effective, become the important industry development policies that sophisticated technologies country takes into account generating and environmental protection.
In the green regenerating energy resource system, the civil power parallel technology has been played the part of important role.By the civil power parallel technology, can be so that the power shortage that is produced when renewable energy resources electric supply installation when breaking down to supply with load or renewable energy resources electric supply installation, can come supply capability to give load by civil power.Wherein, in the time need coming the electric power of undersupply by civil power, this moment, the renewable energy resources then must be consistent with the phase place and the frequency of civil power output voltage.In addition, after electric power that renewable energy resources electric supply installation sends is being supplied to load still too much the time, but then feedback gives Utilities Electric Co..
Fig. 1 is the summary structural representation that has the known parallel regeneration energy resource system of civil power now.
See also shown in Figure 1ly, the existing known parallel regeneration energy resource system 10 of civil power comprises renewable energy resources electric supply installation 110, DC-DC converter 120, AC/DC converter 130, relay 140, controller 150, commercial power supply end 160 and load 170.
The renewable energy resources that DC-DC converter 120 reception renewable energy resources electric supply installations 110 are produced also convert thereof into stable and fixing direct current power.130 direct current powers with DC-DC converter 120 outputs of AC/DC converter convert alternating electromotive force into, and controller 150 is the runnings in order to control renewable energy resources electric supply installation 110, DC-DC converter 120, AC/DC converter 130 and relay 140.Relay 140 can switch AC/DC converter 130 and commercial power supply end 160 according to the running of controller 150, so that alternating electromotive force and/or civil power are offered load 170.
In the civil power parallel technology, the detecting of the position, angle of converter and the position, angle of civil power is the key index of its efficient.Existing known angle position detecting technology can be divided into zero point detection circuit and digital phase locked loop.Yet the cost of zero point detection circuit is higher and disturbed easily and cause the erroneous judgement of position, angle.In addition, though the response speed of digital phase locked loop is fast and precision is good, the design of its controller relatively is not easy also.
This shows that parallel regeneration energy resource system of above-mentioned existing civil power and power transferring method thereof obviously still have inconvenience and defective, and demand urgently further improving in product structure, method and use.In order to solve the problem of above-mentioned existence; Relevant manufacturer there's no one who doesn't or isn't seeks solution painstakingly; But do not see always that for a long time suitable design is developed completion; And common product and method do not have appropriate structure and method to address the above problem, and this obviously is the problem that the anxious desire of relevant dealer solves.Therefore how to found a kind of new civil power parallel connection type power conversion circuit and power transferring method thereof, real one of the current important research and development problem that belongs to, also becoming the current industry utmost point needs improved target.
Summary of the invention
The objective of the invention is to; Overcome the defective that parallel regeneration energy resource system of existing civil power and power transferring method thereof exist; And a kind of new civil power parallel connection type power conversion circuit and power transferring method thereof are provided; Technical problem to be solved is to make it adopt voltage loop circuit control rule to carry out the running control of DC-DC converter and AC/DC converter; So as to significantly being reduced in volume on the hardware circuit, on safeguarding, having better reliability degree; And the position, angle that can detect and calculate civil power more accurately, be very suitable for practicality.
The object of the invention and solve its technical problem and adopt following technical scheme to realize.According to a kind of civil power parallel connection type power conversion circuit that the present invention proposes, it comprises: one first receiving terminal, in order to receive a regeneration energy; One second receiving terminal is in order to receive a civil power; One load end is in order to electrically connect a load; One DC-DC converter, the input of this DC-DC converter are electrically connected to this first receiving terminal, these renewable energy resources are boosted to a stable and fixing direct current electric power; One direct current/alternating-current converter, the input of this AC/DC converter is electrically connected to the output of this DC-DC converter, to receive this direct current power and to convert this direct current power to an alternating electromotive force; One switching unit is electrically connected to output, this second receiving terminal and this load end of this AC/DC converter; One feedback circuit electrically connects this output of this DC-DC converter, this output and this second receiving terminal of this AC/DC converter, with a plurality of feedback signals of feedbacking respectively corresponding to this direct current power, this alternating electromotive force and this civil power; One wave angle location processor is electrically connected to this feedback circuit, to obtain one jiao of position of this civil power by this feedback signal corresponding to this civil power; One pulse wave regulating circuit is electrically connected to the control end of this DC-DC converter and the control end of this AC/DC converter; An and control module; Be electrically connected to this switch unit, this feedback circuit, this wave angle location processor and this pulse wave regulating circuit; Controlling this pulse wave regulating circuit with basis corresponding to this feedback signal of this direct current power makes this stable and fixing direct current power of this DC-DC converter output, basis make this AC/DC converter output frequency and this synchronous alternating electromotive force of this civil power corresponding to this feedback signal and this pulse wave regulating circuit of this angle Position Control of this alternating electromotive force, and control the change action of this switch unit according to the electricity needs of this load; Wherein, when this alternating electromotive force was enough to be supplied to this load, this switch unit broke off the electrically connect between this second receiving terminal and this load end; And when this alternating electromotive force is not enough to be supplied to this load, the electrically connect between this second receiving terminal of this switch unit conducting and this load end.
The object of the invention and solve its technical problem and also can adopt following technical measures further to realize.
Aforesaid civil power parallel connection type power conversion circuit; Wherein said wave angle location processor comprises: a quadrature converter; Be electrically connected to this feedback circuit, involve and this civil power phasic difference 90 string ripple of spending mutually to receive corresponding to this feedback signal of this civil power and to produce according to this with the synchronous string of this civil power; And an arctangent computation unit, be electrically connected between this quadrature converter and this control module, with by with this synchronous string of this civil power involve with this civil power mutually this string ripple of phasic difference 90 degree calculate this position, angle of this civil power.
Aforesaid civil power parallel connection type power conversion circuit; Wherein said control module comprises: one first controller; The input of this first controller is electrically connected to this feedback circuit; And the output of this first controller is electrically connected to this pulse wave regulating circuit, and this first controller is in order to make this stable and fixing direct current power of this DC-DC converter output according to this this pulse wave regulating circuit of feedback signal control corresponding to this direct current power; One second controller; The input of this second controller is electrically connected to this feedback circuit and this wave angle location processor; And the output of this second controller is electrically connected to this pulse wave regulating circuit, and this second controller is in order to make this AC/DC converter output frequency and this synchronous alternating electromotive force of this civil power according to this feedback signal and this pulse wave regulating circuit of this angle Position Control corresponding to this alternating electromotive force; And one the 3rd controller; The input of the 3rd controller is electrically connected to this feedback circuit; And the output of the 3rd controller is electrically connected to this switch unit, and the 3rd controller is in order to control the change action of this switch unit according to the electricity needs of this load.
Aforesaid civil power parallel connection type power conversion circuit, wherein said switch unit is a relay.
The object of the invention and solve its technical problem and also adopt following technical scheme to realize.According to a kind of civil power parallel connection type power transferring method that the present invention proposes, it comprises: receive a regeneration energy; Utilize a DC-DC converter that these renewable energy resources are boosted into a fixing direct current electric power; According to the responsibility cycle of regulating and control this DC-DC converter corresponding to a feedback signal of this direct current power, to cause this stable and fixing direct current power of this DC-DC converter output; Utilize one direct current/alternating-current converter to convert this direct current power to an alternating electromotive force; Utilize one jiao of position of this civil power of wave angle location processor detecting; According to corresponding to this feedback signal of this alternating electromotive force and the responsibility cycle of this this AC/DC converter of angle situation monitoring, to cause this synchronous alternating electromotive force of this AC/DC converter output frequency and this civil power; And export this alternating electromotive force and give a load.
The object of the invention and solve its technical problem and also can adopt following technical measures further to realize.
Aforesaid civil power parallel connection type power transferring method more comprises: the electricity needs selectivity according to this load provides this civil power to this load.
Aforesaid civil power parallel connection type power transferring method, wherein said electricity needs selectivity according to this load provides this civil power to comprise to the step of this load: this electricity needs of this alternating electromotive force and this load relatively; And when this alternating electromotive force does not satisfy this electricity needs of this load, provide this civil power to this load.
Aforesaid civil power parallel connection type power transferring method, the wherein said step of one jiao of position of this civil power of wave angle location processor detecting of utilizing comprises: produce with the synchronous string of this civil power according to the feedback signal corresponding to this civil power and involve and this civil power phasic difference 90 string ripple of spending mutually; And by with this synchronous string of this civil power involve with this civil power mutually this string ripple of phasic difference 90 degree calculate this position, angle of this civil power.
The present invention compared with prior art has tangible advantage and beneficial effect.By technique scheme, civil power parallel connection type power conversion circuit of the present invention and power transferring method thereof have advantage and beneficial effect at least:
One, the present invention can significantly be reduced in the volume on the hardware circuit.
Two, the present invention has better reliability degree on safeguarding.
Three, the present invention can detect and calculate the position, angle of civil power more accurately.
In sum, the invention relates to a kind of civil power parallel connection type power conversion circuit and power transferring method thereof.This civil power parallel connection type power transferring method; Utilize DC-DC converter that the renewable energy resources are boosted to stable and fixing direct current power; Relend by the AC/DC converter and convert direct current power to alternating electromotive force; And according to the responsibility cycle of regulating and control DC-DC converter corresponding to the feedback signal of direct current power, with the output of stable DC/direct current transducer.In addition; Again according to corresponding to the feedback signal of alternating electromotive force and utilize the wave angle location processor to record the responsibility cycle of the position, angle of civil power, and then make the AC/DC converter be able to output frequency and the synchronous alternating electromotive force of civil power with regulation and control AC/DC converter.Whereby, when renewable energy resources power shortage, can utilize civil power to supply with part electric power, and the frequency of alternating electromotive force can be synchronous with mains frequency.The present invention simultaneously also provides a kind of civil power parallel connection type power conversion circuit.The present invention has obvious improvement technically, and has tangible good effect, really is the new design of a novelty, progress, practicality.
Above-mentioned explanation only is the general introduction of technical scheme of the present invention; Understand technological means of the present invention in order can more to know; And can implement according to the content of specification; And for allow above-mentioned and other purposes of the present invention, feature and advantage can be more obviously understandable; The following special preferred embodiment of lifting; And conjunction with figs., describe in detail as follows.
Description of drawings
Fig. 1 is the summary structural representation that has the known parallel regeneration energy resource system of civil power now.
Fig. 2 is the summary structural representation of the civil power parallel connection type power conversion circuit of first embodiment of the invention.
Fig. 3 is the summary structural representation of the wave angle location processor of one embodiment of the invention.
Fig. 4 is the summary structural representation of the civil power parallel connection type power conversion circuit of second embodiment of the invention.
Fig. 5 is the flow chart of the civil power parallel connection type power transferring method of first embodiment of the invention.
Fig. 6 is the flow chart of the civil power parallel connection type power transferring method of second embodiment of the invention.
Fig. 7 is the flow chart of the detecting step of one embodiment of the invention.
10: the parallel regeneration energy resource system 110 of civil power: renewable energy resources electric supply installation
120: DC-DC converter 130: the AC/DC converter
140: relay 150: controller
160: commercial power supply end 170: load
20: civil power parallel connection type power conversion circuit 210: DC-DC converter
220: AC/DC converter 230: switch unit
240: feedback circuit 250: the wave angle location processor
252: quadrature converter 254: the arctangent computation unit
260: pulse wave regulating circuit 270: control module
274: the second controllers of 272: the first controllers
276: the three controller IN_1: first receiving terminal
IN_2: the second receiving terminal OUT: load end
e
ψ: feedback signal e
α: the string ripple synchronous with civil power
e
β: with the civil power string ripple θ of phasic difference 90 degree mutually
e: the position, angle
SV
Dc: feedback signal V
Dc: direct current power
Sv
Ac: feedback signal V
Ac: alternating electromotive force
Pr: electricity needs
Embodiment
Reach technological means and the effect that predetermined goal of the invention is taked for further setting forth the present invention; Below in conjunction with accompanying drawing and preferred embodiment; To civil power parallel connection type power conversion circuit and its embodiment of power transferring method, structure, method, step, characteristic and the effect thereof that proposes according to the present invention, describe in detail as after.
Relevant aforementioned and other technology contents, characteristics and effect of the present invention can be known to appear in the following detailed description that cooperates with reference to graphic preferred embodiment.Through the explanation of embodiment, when can being to reach technological means that predetermined purpose takes and effect to obtain one more deeply and concrete understanding to the present invention, yet the appended graphic usefulness that only provides reference and explanation be not to be used for the present invention is limited.
Civil power parallel connection type power conversion circuit of the present invention and power transferring method thereof are to adopt voltage loop circuit control rule to carry out the running control of DC-DC converter and AC/DC converter.According to civil power parallel connection type power conversion circuit of the present invention and power transferring method thereof; It is after the DC-DC converter back coupling is adjusted to stable output; Just start the AC/DC converter; And civil power parallel connection type power conversion circuit of the present invention and power transferring method thereof are to regulate under the responsibility cycle of AC/DC converter in back coupling; Detect the electric voltage frequency of civil power simultaneously, so that the output voltage frequency of AC/DC converter and civil power are synchronous.
Fig. 2 is the summary structural representation of the civil power parallel connection type power conversion circuit of first embodiment of the invention.
See also shown in Figure 2ly, the civil power parallel connection type power conversion circuit 20 of first embodiment of the invention comprises one first receiving terminal IN_1, one second receiving terminal IN-_2, a load end OUT, a DC-DC converter 210, one direct current/alternating-current converter 220, a switching unit 230, a feedback circuit 240, a wave angle location processor 250, a pulse wave regulating circuit 260 and a control module 270.
The first receiving terminal IN_1 can be electrically connected to renewable energy resources electric supply installation 110, to receive the renewable energy resources that renewable energy resources electric supply installation 110 is produced.This renewable energy resources electric supply installation 110 can be fuel cell system, yet this is not in order to restriction the present invention.
The second receiving terminal IN_2 can be electrically connected to commercial power supply end 160, to receive the civil power that commercial power supply end 160 is provided.
Load end OUT can be electrically connected to a load 170, uses to load 170 so that electric power to be provided.
The input of DC-DC converter 210 is electrically connected to the first receiving terminal IN_1; And the output of DC-DC converter 210 is electrically connected to the input of AC/DC converter 220 again, and the output of AC/DC converter 220 then is electrically connected to switch unit 230.In addition, switch unit 230 also is electrically connected to the second receiving terminal IN_2 and load end OUT, to electrically connect with commercial power supply end 160 and load 170 respectively.Wherein, switch unit 230 can be a relay.
DC-DC converter 210 is that the received renewable energy resources of the first receiving terminal IN_1 are boosted to stable and fixing direct current power, and exports to AC/DC converter 220.AC/DC converter 220 converts the direct current power that receives to alternating electromotive force again.
In this; The input of the output of feedback circuit 240 fechtable DC-DC converters 210, the output of AC/DC converter 220 and the second receiving terminal IN_2; Give control module 270 to feedback corresponding to the feedback signal of direct current power with corresponding to the feedback signal of alternating electromotive force, and feedback signal corresponding to civil power capable of feedback is given wave angle location processor 250.Wherein, The output voltage of feedback circuit 240 fechtable DC-DC converters 210, the output voltage of AC/DC converter 220 and the voltage waveform of civil power; And the output voltage of DC-DC converter 210 and the output voltage of AC/DC converter 220 feedback to control module 270, and the voltage waveform of civil power is feedback to wave angle location processor 250.
Wherein, control module 270 can be controlled the adjusting that pulse wave regulating circuit 260 carry out the responsibility cycle of DC-DC converter 210 according to the output voltage of DC-DC converter 210.In this; Control module 270 can be compared the output voltage of DC-DC converter 210 with the first preset voltage command value, and then according to difference control pulse wave regulating circuit 260 generations first adjusting command between the output voltage of DC-DC converter 210 and preset first voltage command value.
After DC-DC converter 210 was adjusted to the stable and fixing voltage (that is, direct current power) of output, control module 270 just caused pulse wave regulating circuit 260 to start AC/DC converter 220.Simultaneously, wave angle location processor 250 obtains the position, angle of line voltage by the feedback signal corresponding to civil power, and exports to control module 270.Control module 270 again according to the position, angle that obtains line voltage corresponding to the feedback signal of alternating electromotive force and 250 detectings of wave angle location processor with control pulse wave regulating circuit 260.Pulse wave regulating circuit 260 can be given AC/DC converter 220 through producing second adjusting command, to regulate the responsibility cycle of AC/DC converter 220, so that AC/DC converter 220 output frequencies and the synchronous alternating electromotive force of civil power.
In other words; Control module 270 can be according to producing control signal to pulse wave regulating circuit 260 corresponding to the feedback signal of alternating electromotive force and the position, angle of line voltage; Cause pulse wave regulating circuit 260 responsive control signals and produce second adjusting command, to regulate the responsibility cycle of AC/DC converter 220 to AC/DC converter 220.Wherein, control module 270 adjusting that can carry out the responsibility cycle of AC/DC converter 220 according to the angle Position Control pulse wave regulating circuit 260 of the output voltage of AC/DC converter 220 and line voltage.
In this; Control module 270 can be compared the output voltage of AC/DC converter 220 with the second preset voltage command value, and then according to the difference between the output voltage of AC/DC converter 220 and preset second voltage command value and angle Position Control pulse wave regulating circuit 260 generations second adjusting command of line voltage.In addition, wave angle location processor 250 can obtain the position, angle of line voltage according to the feedback signal corresponding to civil power.Particularly, wave angle location processor 250 can calculate the position, angle of line voltage according to the voltage waveform of civil power.
Moreover control module 270 also can be controlled the change action of switch unit 230 according to the electricity needs of load 170.Under normal condition, switch unit 230 can electrically conduct the output and the load end OUT of AC/DC converter 220, so that the alternating electromotive force that AC/DC converter 220 is exported is supplied to load 170 via load end OUT.In other words, when the alternating electromotive force of being exported when AC/DC converter 220 was enough to be supplied to load 170, switch unit 230 can break off the electrically connect between the second receiving terminal IN_2 and the load end OUT.
And the alternating electromotive force of being exported when AC/DC converter 220 is when being not enough to be supplied to load 170, and the electrically connect between 230 conductings of switch unit, second receiving terminal IN_2 and the load end OUT is to offer civil power load 170.Wherein, civil power can be supplied the portion of energy that alternating electromotive force that AC/DC converter 220 exported does not satisfy the electricity needs of load 170.In other words, when the alternating electromotive force of being exported when AC/DC converter 220 is not enough to be supplied to load 170, the alternating electromotive force that can be exported by AC/DC converter 220 and the power demand of the common share load 170 of civil power.
Thus,, can significantly be reduced in the volume on the hardware circuit, and on safeguarding, can have better reliability degree by the enforcement of present embodiment, and the position, angle that can detect and calculate civil power more accurately.
Fig. 3 is the summary structural representation of the wave angle location processor of one embodiment of the invention.See also shown in Figure 3ly, wave angle location processor 250 can comprise: quadrature converter 252 and arctangent computation unit 254.
Quadrature converter 252 is to be electrically connected between feedback circuit 240 and the arctangent computation unit 254, and 254 of arctangent computation unit are electrically connected between quadrature converter 252 and the control module 270.
In this, quadrature converter 252 receives the feedback signal e corresponding to civil power that feedback circuit 240 is feedback
ψ, and according to feedback signal e
ψProduce and the synchronous string ripple e of civil power
αAnd with the civil power string ripple e that spends of phasic difference 90 mutually
βThen, arctangent computation unit 254 relends by the string ripple e synchronous with civil power
αAnd with the civil power string ripple e that spends of phasic difference 90 mutually
βCalculate position, the angle θ of civil power
e, and export to control module 270.In this, arctangent computation unit 254 can be through obtaining the string ripple e synchronous with civil power
αAnd with the civil power string ripple e that spends of phasic difference 90 mutually
βPositive traditional method of indicating the pronunciation of a Chinese character function to calculate position, the angle θ of civil power
eWherein, string ripple e
α, e
βBoth are quadrature, i.e. phase phasic difference 90 degree.
Fig. 4 is the summary structural representation of the civil power parallel connection type power conversion circuit of second embodiment of the invention.
See also shown in Figure 4ly, control module 270 can comprise three controllers, describes for ease, below is referred to as first controller 272, second controller 274 and the 3rd controller 276 respectively.
The input of first controller 272 is electrically connected to feedback circuit 240, and the output of first controller 272 is electrically connected to pulse wave regulating circuit 260.In other words, first controller 272 is to be electrically connected between feedback circuit 240 and the pulse wave regulating circuit 260.First controller 272 is according to the feedback signal SV corresponding to direct current power
DcControl pulse wave regulating circuit 260 is so that the stable and fixing direct current power V of DC-DC converter 210 outputs
DcWherein, corresponding to the feedback signal SV of direct current power
DcCan be the output voltage of DC-DC converter 210, i.e. the direct current power V that exported of DC-DC converter 210
Dc
The input of second controller 274 is electrically connected to feedback circuit 240 and wave angle location processor 250, and the output of second controller 274 is electrically connected to pulse wave regulating circuit 260.In other words, second controller 274 is to be electrically connected between feedback circuit 240 and the pulse wave regulating circuit 260 and between wave angle location processor 250 and the pulse wave regulating circuit 260.
The input of the 3rd controller 276 is electrically connected to feedback circuit 240, and the output of the 3rd controller 276 is electrically connected to switch unit 230.In other words, the 3rd controller 276 is to be electrically connected between feedback circuit 240 and the switch unit 230.The 3rd controller 276 can be controlled the change action of switch unit 230 according to the electricity needs Pr of load 170.Wherein, the 3rd controller 276 can compare the alternating electromotive force V that AC/DC converter 220 is exported
AcElectricity needs Pr with load 170.And, as alternating electromotive force V
AcWhen not satisfying the electricity needs Pr of load 170; The 3rd controller 276 control switch units 230; With with the electrically connect conducting between the second receiving terminal IN_2 and the load end OUT, so as to the received civil power of the second receiving terminal IN_2 being offered load 170 through load end OUT.
In addition, according to the foregoing circuit framework, the present invention can provide a kind of civil power parallel connection type power transferring method again.
Fig. 5 is the flow chart of the civil power parallel connection type power transferring method of first embodiment of the invention.See also shown in Figure 5ly, this civil power parallel connection type power transferring method comprises: receive a regeneration energy (S310); Utilize DC-DC converter that the renewable energy resources are boosted into fixing direct current power (S320); According to the responsibility cycle of regulating and control DC-DC converter corresponding to the feedback signal of direct current power, to cause the stable and fixing direct current power (S330) of DC-DC converter output; Utilize the AC/DC converter to convert direct current power to alternating electromotive force (S340); Utilize the position, angle (S350) of wave angle location processor detecting civil power; According to corresponding to the feedback signal of alternating electromotive force and the responsibility cycle of angle situation monitoring AC/DC converter, to cause the synchronous alternating electromotive force of AC/DC converter output frequency and civil power (S360); And output AC electric power is given load (S370).
Wherein, can be the output voltage of DC-DC converter, i.e. the direct current power exported of DC-DC converter corresponding to the feedback signal of direct current power.And can be the output voltage of AC/DC converter corresponding to the feedback signal of alternating electromotive force, i.e. the alternating electromotive force exported of AC/DC converter.And; Be in this civil power parallel connection type power transferring method after direct current power reaches the state of stablizing and fixing; Just cause the AC/DC converter to stablize and fixing direct current power converts alternating electromotive force to; And when the output frequency of alternating electromotive force and civil power synchronously after, just alternating electromotive force is exported to load and is used.
In addition, see also shown in Figure 6ly, Fig. 6 is the flow chart of the civil power parallel connection type power transferring method of second embodiment of the invention, also can provide civil power to load according to the electricity needs selectivity of load.
Wherein, can utilize a controller (being the 3rd above-mentioned controller) the relatively alternating electromotive force exported of AC/DC converter and the electricity needs (S382) of load.And when the alternating electromotive force of being exported when the AC/DC converter was enough to be supplied to load, switch unit can break off electrically connect between civil power and the load, with the required electric power of being exported by the AC/DC converter of the independent offered load of alternating electromotive force (S370).And the alternating electromotive force of being exported when the AC/DC converter is when being not enough to be supplied to load, and switch unit is electrically connect between conducting civil power and the load then, civil power is offered load (S384).
Wherein, civil power can only be supplied the portion of energy that the AC/DC alternating electromotive force that converter is exported does not satisfy the electricity needs of load.In other words; When the alternating electromotive force of being exported when the AC/DC converter is not enough to be supplied to load; Alternating electromotive force and the civil power that the AC/DC converter can be exported offer load simultaneously; Just make the AC/DC converter still output AC electric power give load; But not enough part then offers load (S384) by civil power; And then allow the civil power power demand of share load jointly, and provide civil power to load according to the electricity needs selectivity of load.
In addition, the position, angle of line voltage can detecting obtains through the voltage waveform of acquisition civil power.See also shown in Figure 7; Detecting step (S350) can comprise: involve and the civil power string ripple (S352) of phasic difference 90 degree mutually according to producing corresponding to the feedback signal of civil power with the synchronous string of civil power, and by with the synchronous string of civil power involve with civil power mutually the phasic difference 90 string ripple of spending calculate the position, angle (S354) of civil power.
Wherein, can be the voltage waveform of civil power corresponding to the feedback signal of civil power.In this, the step (S352) that produces the string ripple can be utilized quadrature converter to be received from feedback circuit to feedback the voltage waveform of the civil power that produces, and produces and the synchronous mutually orthogonal string ripple of civil power according to the voltage waveform of civil power.In calculating position, angle step (S354), then can utilize the arctangent computation unit through obtaining the positive traditional method of indicating the pronunciation of a Chinese character function with the synchronous string ripple of civil power, to calculate the position, angle of civil power.
In sum, can reduce the volume on the civil power parallel connection type power conversion circuit hardware circuit, also can have better reliability degree by the enforcement of present embodiment.In addition, by acquisition and the synchronous string ripple of civil power exactly, detecting and to calculate the position, angle of civil power accurately, and then reach and make the renewable energy resources and the synchronous effect of mains frequency.
The above; It only is preferred embodiment of the present invention; Be not that the present invention is done any pro forma restriction; Though the present invention discloses as above with preferred embodiment; Yet be not in order to limit the present invention; Anyly be familiar with the professional and technical personnel; In not breaking away from technical scheme scope of the present invention; When the method that can utilize above-mentioned announcement and technology contents are made a little change or be modified to the equivalent embodiment of equivalent variations; In every case be the content that does not break away from technical scheme of the present invention;, all still belong in the scope of technical scheme of the present invention any simple modification, equivalent variations and modification that above embodiment did according to technical spirit of the present invention.
Claims (8)
1. civil power parallel connection type power conversion circuit is characterized in that it comprises:
One first receiving terminal is in order to receive a regeneration energy;
One second receiving terminal is in order to receive a civil power;
One load end is in order to electrically connect a load;
One DC-DC converter, the input of this DC-DC converter are electrically connected to this first receiving terminal, these renewable energy resources are boosted to a stable and fixing direct current electric power;
One direct current/alternating-current converter, the input of this AC/DC converter is electrically connected to the output of this DC-DC converter, to receive this direct current power and to convert this direct current power to an alternating electromotive force;
One switching unit is electrically connected to output, this second receiving terminal and this load end of this AC/DC converter;
One feedback circuit electrically connects this output of this DC-DC converter, this output and this second receiving terminal of this AC/DC converter, with a plurality of feedback signals of feedbacking respectively corresponding to this direct current power, this alternating electromotive force and this civil power;
One wave angle location processor is electrically connected to this feedback circuit, to obtain one jiao of position of this civil power by this feedback signal corresponding to this civil power;
One pulse wave regulating circuit is electrically connected to the control end of this DC-DC converter and the control end of this AC/DC converter; And
One control module; Be electrically connected to this switch unit, this feedback circuit, this wave angle location processor and this pulse wave regulating circuit; Controlling this pulse wave regulating circuit with basis corresponding to this feedback signal of this direct current power makes this stable and fixing direct current power of this DC-DC converter output, basis make this AC/DC converter output frequency and this synchronous alternating electromotive force of this civil power corresponding to this feedback signal and this pulse wave regulating circuit of this angle Position Control of this alternating electromotive force, and control the change action of this switch unit according to the electricity needs of this load;
Wherein, when this alternating electromotive force was enough to be supplied to this load, this switch unit broke off the electrically connect between this second receiving terminal and this load end; And when this alternating electromotive force is not enough to be supplied to this load, the electrically connect between this second receiving terminal of this switch unit conducting and this load end.
2. civil power parallel connection type power conversion circuit according to claim 1 is characterized in that wherein said wave angle location processor comprises:
One quadrature converter is electrically connected to this feedback circuit, involves and this civil power phasic difference 90 string ripple of spending mutually to receive corresponding to this feedback signal of this civil power and to produce according to this with the synchronous string of this civil power; And
One arctangent computation unit is electrically connected between this quadrature converter and this control module, with by with this synchronous string of this civil power involve with this civil power mutually this string ripple of phasic difference 90 degree calculate this position, angle of this civil power.
3. civil power parallel connection type power conversion circuit according to claim 1 is characterized in that wherein said control module comprises:
One first controller; The input of this first controller is electrically connected to this feedback circuit; And the output of this first controller is electrically connected to this pulse wave regulating circuit, and this first controller is in order to make this stable and fixing direct current power of this DC-DC converter output according to this this pulse wave regulating circuit of feedback signal control corresponding to this direct current power;
One second controller; The input of this second controller is electrically connected to this feedback circuit and this wave angle location processor; And the output of this second controller is electrically connected to this pulse wave regulating circuit, and this second controller is in order to make this AC/DC converter output frequency and this synchronous alternating electromotive force of this civil power according to this feedback signal and this pulse wave regulating circuit of this angle Position Control corresponding to this alternating electromotive force; And
One the 3rd controller, the input of the 3rd controller is electrically connected to this feedback circuit, and the output of the 3rd controller is electrically connected to this switch unit, and the 3rd controller is in order to the change action according to this switch unit of electricity needs control of this load.
4. civil power parallel connection type power conversion circuit according to claim 1 is characterized in that wherein said switch unit is a relay.
5. civil power parallel connection type power transferring method is characterized in that it may further comprise the steps:
Receive a regeneration energy;
Utilize a DC-DC converter that these renewable energy resources are boosted into a fixing direct current electric power;
According to the responsibility cycle of regulating and control this DC-DC converter corresponding to a feedback signal of this direct current power, to cause this stable and fixing direct current power of this DC-DC converter output;
Utilize one direct current/alternating-current converter to convert this direct current power to an alternating electromotive force;
Utilize one jiao of position of this civil power of wave angle location processor detecting;
According to corresponding to this feedback signal of this alternating electromotive force and the responsibility cycle of this this AC/DC converter of angle situation monitoring, to cause this synchronous alternating electromotive force of this AC/DC converter output frequency and this civil power; And
Export this alternating electromotive force and give a load.
6. civil power parallel connection type power transferring method according to claim 5 is characterized in that more comprising: the electricity needs selectivity according to this load provides this civil power to this load.
7. civil power parallel connection type power transferring method according to claim 6 is characterized in that wherein said electricity needs selectivity according to this load provides this civil power to comprise to the step of this load:
This electricity needs of this alternating electromotive force and this load relatively; And
When this alternating electromotive force does not satisfy this electricity needs of this load, provide this civil power to this load.
8. civil power parallel connection type power transferring method according to claim 5 is characterized in that the wherein said step of one jiao of position of this civil power of wave angle location processor detecting of utilizing comprises:
Involve and this civil power phasic difference 90 string ripple of spending mutually according to producing corresponding to a feedback signal of this civil power with the synchronous string of this civil power; And
By with this synchronous string of this civil power involve with this civil power mutually this string ripple of phasic difference 90 degree calculate this position, angle of this civil power.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2010102423892A CN102347612A (en) | 2010-07-29 | 2010-07-29 | Commercial power parallel type power converting circuit and power converting method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010102423892A CN102347612A (en) | 2010-07-29 | 2010-07-29 | Commercial power parallel type power converting circuit and power converting method thereof |
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| CN102347612A true CN102347612A (en) | 2012-02-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010102423892A Pending CN102347612A (en) | 2010-07-29 | 2010-07-29 | Commercial power parallel type power converting circuit and power converting method thereof |
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Application publication date: 20120208 |