CN102739094B - A kind of parasitic inverse method and device - Google Patents
A kind of parasitic inverse method and device Download PDFInfo
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- CN102739094B CN102739094B CN201110083188.7A CN201110083188A CN102739094B CN 102739094 B CN102739094 B CN 102739094B CN 201110083188 A CN201110083188 A CN 201110083188A CN 102739094 B CN102739094 B CN 102739094B
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Abstract
The present invention discloses a kind of parasitic inverse method and device thereof, carries out signal of telecommunication sampling by zero passage change of current assembly from public electric wire net; When the electric signal waveform commutation of sampling, generate electric current commutation signal by described zero passage change of current assembly; By described zero passage change of current assembly, described electric current commutation signal is sent to the relative constant flow regulation circuit of DC/DC; According to electric current commutation signal, by the relative constant flow regulation circuit of described DC/DC, the sense of current commutation that direct current is inputted; The direct current of described commutation is input in public electric wire net and parasitizes on power frequency envelope.The electrical network sine of the electric energy energy Initial adaption distortion that this parasitic dc exports involves multiple different frequency and irregular waveform, the voltage of electric energy in electrical network and frequency are not limited, the grid-connected of the different electrical network in each department can be adapted to, there is utilization rate of electrical simultaneously high, the advantage of the excellent performance of electromagnetism interference.
Description
Technical field
The present invention relates to the technical field of parasitic inversion, particularly relate to and be a kind ofly applied to parasitic inverse method in grid-connected system and device thereof.
Background technology
As everyone knows, existing inverter is a kind of electronic installation direct current (DC) being converted to alternating current (AC), has been widely used in the life of people.Existing inverter has a variety of, according to the difference of energy source, is divided into coal electricity inverter, solar inverter, wind energy inverter, nuclear energy inverter etc.; Different according to purposes, be divided into independent control inverter, parasitic inverter.And applying more and more widely along with the solar energy as regenerative resource, as in photovoltaic parallel in system, the parasitic inverter of photovoltaic is that the direct current exported by solar panel converts to and meets the alternating current and requisite equipment that public electric wire net requires.
Be illustrated in figure 1 the parasitic inverter of one of prior art, first the voltage that solar panel array 101 exports become the direct voltage of 400V ~ 600V through BOOST booster circuit 102 liters, power points tracking adjusting device 103 traces into the maximum power point of solar panel array output by voltage sample and current sample, simultaneously, by a single-chip microcomputer 104 to the frequency of the civil power collected, phase place and voltage are input in the lump in H-bridge inverter circuit 105 after revising and convert alternating current to, industrial-frequency alternating current is leached again through low pass filter 106, be connected to the grid after being processed by isolating transformer 107.Fig. 3 a is sinusoidal wave schematic diagram after the grid-connected parasitism of electric energy.
But there is following defect in existing parasitic inverter:
1) alternating current that existing parasitic inverter exports can only be the alternating current of fixing frequency and voltage, and that is, this inverter requires that ac frequency, phase place and the voltage exported in the alternating current in electrical network and inverter aligns.And the mains frequency of countries in the world and voltage are not quite similar, therefore the scope of application of this inverter is subject to certain restrictions, and then needs to be equipped with different standard inverters for different electrical networks.
2) power consumption is comparatively large, and utilization rate of electrical reduces.The voltage that solar panel array exports will consume the electric energy of 1.5 ~ 3% through BOOST boosting, and H-bridge inverter circuit will consume the electric energy of 2 ~ 3%, and isolating transformer will consume the electric energy of 1 ~ 1.5%, and these 3 wastage in bulk or weights are exactly 4.5%.
3) electric energy is after input and output repeatedly, and the electromagnetic interference be subject to is larger.
Summary of the invention
Invention provides a kind of method and the device thereof that direct current can be colonized in the parasitic inversion on public electric wire net, excessive for solving current parasitic inversion power consumption, can only be the problem of fixed frequency, fixed voltage alternating current parasitism.
The present invention discloses a kind of parasitic inverse method, wherein, comprises the steps:
From public electric wire net, signal of telecommunication sampling is carried out by zero passage change of current assembly;
When the electric signal waveform commutation of sampling, generate electric current commutation signal by described zero passage change of current assembly;
By described zero passage change of current assembly, described electric current commutation signal is sent to the relative constant flow regulation circuit of DC/DC,
According to electric current commutation signal, by the relative constant flow regulation circuit of described DC/DC, the sense of current commutation that direct current is inputted;
The direct current of described commutation is input in public electric wire net, to parasitize on alternating current envelope.
Above-mentioned parasitic inverse method, wherein, the step that zero passage change of current assembly carries out signal of telecommunication sampling from public electric wire net comprises: from public electric wire net, carry out current sample and voltage sample.
Above-mentioned parasitic inverse method, wherein, when the electric signal waveform commutation of sampling, the step that zero passage change of current assembly generates electric current commutation signal comprises the steps:
Judge the sense of current, if the sense of current is just, then the first switch conduction in zero passage change of current assembly; If the sense of current is negative, then the second switch conducting in zero passage change of current assembly;
When described first switch and described second switch switched conductive, generate electric current commutation signal by zero passage change of current assembly.
Above-mentioned parasitic inverse method, wherein, in the step of the sense of current commutation that direct current inputs according to electric current commutation signal by the relative constant flow regulation circuit of described DC/DC, comprises the steps:
The direct current that continuous reception transmits from direct current energy input;
Judge currently whether receive described electric current commutation signal, if receive electric current commutation signal, then direct current is commutated; If do not receive electric current commutation signal, then do not deal with.
Above-mentioned parasitic inverse method, wherein, is input to the direct current of described commutation in the step in public electric wire net, comprises the steps:
The direct current of commutation is sent to primary;
At the secondary generation electric current of transformer, described electric current to colonize in public electric wire net on original electric current.
According to another aspect of the present invention, a kind of parasitic inverter is also disclosed, wherein, comprise the relative constant flow regulation circuit of DC/DC, the direct current energy input of the relative constant flow regulation circuit of described DC/DC connects solar panel array, its direct current energy output connects public electric wire net, also comprise zero passage change of current assembly, described zero passage change of current component inputs connects described public electric wire net, its output connects the input of the zero passage change of current signal of the relative constant flow regulation circuit of described DC/DC, described zero passage change of current assembly is sampled from the signal of telecommunication described public electric wire net, when electric signal waveform in public electric wire net commutates, described zero passage change of current assembly sends the direct current commutation that change of current signal makes the relative constant flow regulation circuit of described DC/DC export.
Above-mentioned parasitic inverter, wherein, described zero passage change of current assembly comprises the first photoelectrical coupler, first resistance, second photoelectrical coupler and the second resistance, described first photoelectrical coupler is encapsulated by the first light-emitting diode and the first photoconductive tube and forms, described second photoelectrical coupler is encapsulated by the second light-emitting diode and the second photoconductive tube and forms, described first resistance one end connects the live wire of described public electric wire net, the other end connects the negative electrode of described first light-emitting diode and the anode of described second light-emitting diode, described second resistance one end connects the zero line of described public electric wire net, the other end connects the anode of described first light-emitting diode and the negative electrode of described second light-emitting diode, described first photoconductive tube and described second photoconductive tube are as two signal output parts of described zero passage change of current assembly, connect the input of the zero passage change of current signal of the relative constant flow regulation circuit of described DC/DC respectively.
Above-mentioned parasitic inverter, wherein, the relative constant flow regulation circuit of described DC/DC is managed by an IGBT, 2nd IGBT pipe, 3rd IGBT pipe, 4th IGBT pipe, 3rd resistance and the 4th resistance composition, a described IGBT pipe and the collector electrode of the 3rd IGBT pipe are connected to the direct current energy input anode of the relative constant flow regulation circuit of described DC/DC jointly, described 2nd IGBT pipe and the emitter of described 4th IGBT pipe are connected to the direct current energy input negative terminal of the relative constant flow regulation circuit of described DC/DC jointly, emitter and the collector electrode of described 2nd IGBT pipe of a described IGBT pipe are connected the direct current energy output of the relative constant flow regulation circuit of described DC/DC jointly, emitter and the collector electrode of described 4th IGBT pipe of described 3rd IGBT pipe are connected the direct current energy output of the relative constant flow regulation circuit of described DC/DC jointly, a described IGBT pipe is connected the first photoconductive tube in described first photoelectrical coupler jointly with the grid of the 4th IGBT pipe, also connect one end of described 4th resistance, the other end of described 4th resistance connects the direct current energy input anode of the relative constant flow regulation circuit of described DC/DC, described 2nd IGBT pipe is connected the second photoconductive tube in described second photoelectrical coupler jointly with the grid of described 3rd IGBT pipe, also connect one end of described 3rd resistance, the other end of described 3rd resistance connects the direct current energy input anode of the relative constant flow regulation circuit of described DC/DC.
Above-mentioned parasitic inverter, wherein, described IGBT pipe can replace with metal-oxide-semiconductor.
Above-mentioned parasitic inverter, wherein, the relative constant flow regulation circuit of described DC/DC is by the first operational amplifier, second operational amplifier, 5th resistance, 6th resistance, 7th resistance and the 8th resistance composition, the input in the same way of described first operational amplifier is connected the first photoconductive tube in described first photoelectrical coupler jointly with the reverse input end of described second operation method device, also connect one end of described 6th resistance, the other end of described 6th resistance connects the direct current energy input anode of the relative constant flow regulation circuit of described DC/DC, the input in the same way of described second operational amplifier is connected the second photoconductive tube in described second photoelectrical coupler jointly with the reverse input end of described first operation method device, also connect one end of described 5th resistance, the other end of described 5th resistance connects the direct current energy input anode of the relative constant flow regulation circuit of described DC/DC, the output of described first operational amplifier connects one end of the 7th resistance, the other end of described 7th resistance connects the direct current energy output of the relative constant flow regulation circuit of described DC/DC, the output of described second operational amplifier connects one end of the 8th resistance, the other end of described 8th resistance connects the direct current energy output of the relative constant flow regulation circuit of described DC/DC, described first operational amplifier is connected the direct current energy input anode of the relative constant flow regulation circuit of described DC/DC with the voltage input anode of the second operational amplifier, the voltage input negativing ending grounding of described first operational amplifier and the second operational amplifier.
Above-mentioned parasitic inverter, wherein, also comprise power points tracking adjusting device, the input of described power points tracking adjusting device connects described solar panel array, for carrying out voltage sample and current sample to solar panel, the output of described power points tracking adjusting device connects the direct current energy input of the relative constant flow regulation circuit of described DC/DC.
Above-mentioned parasitic inverter, wherein, also comprises isolating transformer, and described isolating transformer input connects the output of the relative constant flow regulation circuit of described DC/DC, and the output of described isolating transformer connects the input of public electric wire net.
Above-mentioned parasitic inverter, wherein, also comprises low pass filter, and described low pass filter input connects the output of the relative constant flow regulation circuit of described DC/DC, and the output of described low pass filter connects the input of public electric wire net.
By above-mentioned technological means, on the electric current that parasitic inverse method of the present invention and device thereof can make direct current colonize in the public electric wire net of random waveform, drastically increase the applicability of parasitic inversion.
Accompanying drawing explanation
By reading the detailed description done non-limiting example with reference to following accompanying drawing, other features, objects and advantages of the present invention will become more obvious:
Fig. 1 illustrates according to prior art, a kind of application principle block diagram of parasitic inverter;
Fig. 2 illustrates according to of the present invention, a kind of application principle schematic diagram of parasitic inverter;
Fig. 3 a to Fig. 3 d illustrates according to of the present invention, the grid-connected rear waveform schematic diagram formed different wave parasitism of the electric energy that a kind of parasitic inverter exports;
Fig. 4 illustrates according to a first embodiment of the present invention, a kind of high-power parasitic inversion isoboles of parasitic inverter;
Fig. 5 illustrates according to a second embodiment of the present invention, a kind of parasitic inversion isoboles of high-power non-isolated of parasitic inverter; And
Fig. 6 illustrates according to a third embodiment of the present invention, a kind of parasitic inversion isoboles of small-power of parasitic inverter.
Embodiment
Below in conjunction with the drawings and the specific embodiments, the present invention is further elaborated.Embodiment described herein only for explaining the present invention, the protection range be not intended to limit the present invention.
Further, composition graphs 2 to Fig. 4, the convenient method understanding parasitic inversion of the present invention.Wherein, Fig. 2 illustrates according to of the present invention, a kind of application principle schematic diagram of parasitic inverter.
First, from public electric wire net, signal of telecommunication sampling is carried out by zero passage change of current assembly 202; Because direct current is accessed industrial frequency AC electrical network by the present invention, so the signal of telecommunication in electrical network will commutate by separated in time, when the electric signal waveform commutation of sampling, generate electric current commutation signal by described zero passage change of current assembly 202; By described zero passage change of current assembly, described electric current commutation signal is sent to the relative constant flow regulation circuit 201 of DC/DC again; According to electric current commutation signal, by the relative constant flow regulation circuit of described DC/DC, the sense of current commutation that direct current is inputted; The direct current of described commutation is input in public electric wire net and carries out, so just parasitize on alternating current envelope.
Wherein, carry out signal of telecommunication sampling comprise carry out current sample and voltage sample from public electric wire net by zero passage change of current assembly 202 from public electric wire net, make direct current can according to the voltage of different public electric wire nets, frequency carries out electric energy parasitism.
With reference to figure 4, the method that zero passage change of current assembly 202 generates electric current commutation signal is: judge the sense of current, if the sense of current is just, then and the first switch conduction in zero passage change of current assembly; If the sense of current is negative, then the second switch conducting in zero passage change of current assembly; Wherein, described first switch and second switch can be the photoelectrical couplers of two shown in Fig. 4,
When described first switch and described second switch switched conductive, electric current commutation signal is generated by zero passage change of current assembly, this step, after have employed photoelectrical coupler conducting, photo resistance RL1 as shown in Figure 4 and RL2 conducting, the energising of R4 and R3 difference ground connection is realized, completes the process of production commutation signal.
Meanwhile, direct current continues in the process exported.In the process, DC/DC is relative, and constant flow regulation circuit often receives primary current commutation signal, just direct current is commutated.Namely judge currently whether receive described electric current commutation signal, if receive electric current commutation signal, then direct current is commutated; If do not receive electric current commutation signal, then do not deal with.The aforementioned circuit realiration production commutation signal (with reference to figure 4) logical by two-wheeled conductance, in this step, the circuit that can connect described two-wheeled conductance respectively logical by two switch elements has judged whether to receive electric current commutation signal.
Finally, the direct current of commutation is sent to primary; Because now direct current commutating frequency is identical with the alternating current commutating frequency in public electric wire net, just identical with the ac frequency in public electric wire net in the frequency of the secondary generation electric current of transformer, described electric current to colonize in public electric wire net on original electric current.
Solar panel array 101, power points tracking adjusting device 103 and isolating transformer 107 except having indicated in Fig. 1 in Fig. 2, also comprise the relative constant flow regulation circuit 201 of DC/DC and zero passage change of current assembly 202.Further, the direct current energy input of the relative constant flow regulation circuit 201 of DC/DC connects solar panel array 101, its direct current energy output connects public electric wire net, in one embodiment, with reference to figure 2, it is elementary that DC/DC connects an isolating transformer 107 relative to the direct current energy output of constant flow regulation circuit 201, isolating transformer 107 levels connect public electric wire net, the input of zero passage change of current assembly 202 connects described public electric wire net, and its output connects the input of the zero passage change of current signal of the relative constant flow regulation circuit 201 of DC/DC.
Described zero passage change of current assembly carries out voltage and current sample from described public electric wire net, when waveform in public electric wire net is in positive half cycle and negative half period conversion, through zero-bit, described zero passage change of current assembly sends change of current signal and makes electric current commutation in the relative constant flow regulation circuit of described DC/DC, and the direct current commutating frequency that described DC/DC is exported relative to constant flow regulation circuit is consistent with the frequency of the alternating current in described public electric wire net.
In the present embodiment, parasitic inverter is a relative constant flow regulation circuit 201 of DC/DC being subject to zero passage change of current signal controlling, for the direct current energy that solar panel array 101 exports, the direct current energy after (MPPT) is regulated through power points tracking adjusting device 103 MPPT maximum power point tracking, input in the relative constant flow regulation circuit 201 of DC/DC of parasitic inverter of the present invention, simultaneously, zero passage change of current assembly 202 is by voltage acquisition and current acquisition, when waveform in public electric wire net is in positive half cycle and negative half period conversion, through zero-bit, zero passage change of current assembly 202 detects the zero passage change of current signal in line voltage, described zero passage change of current assembly sends change of current signal and makes to carry out PWM adjustment process in the relative constant flow regulation circuit of described DC/DC, control electric current commutation in the relative constant flow regulation circuit of described DC/DC, the direct current commutating frequency that DC/DC is exported relative to constant flow regulation circuit 201 is consistent with the frequency of the alternating current in described public electric wire net, DC/DC realizes inversion actions relative to constant flow regulation circuit 201 and carries out the output of parasitic electric energy under the control of described electrical network zero passage change of current signal, that is, the electric energy that the relative constant flow regulation circuit of DC/DC exports was still direct current energy before being connected to the grid.DC/DC manages (or metal-oxide-semiconductor etc. can other pipes of real constant current output) relative to constant flow regulation circuit by IGBT, switch transformer, photoelectrical coupler, operational amplifier, single-chip microcomputer, the compositions such as resistance, electric capacity, inductance, in the application scenario of different capacity, then specifically have different forms, below then with high-power parasitic inverter, the execution mode of the parasitic inverter of high-power non-isolated and the parasitic inverter of small-power is described.
Fig. 3 a to Fig. 3 d illustrates according to of the present invention, the grid-connected rear waveform schematic diagram formed different wave parasitism of the electric energy that a kind of parasitic inverter exports.Wherein, as shown in the figure, waveform shown in Fig. 3 a is sinusoidal wave, and waveform shown in Fig. 3 b is triangular wave, and waveform shown in Fig. 3 c is discontinuous wave, waveform shown in Fig. 3 d is square wave, particularly, waveform 301 part in Fig. 3 a is original current waveform in electrical network, and waveform 302 part is parasitic waveform, similarly, Fig. 3 b, Fig. 3 c and Fig. 3 d do not repeat them here.
Following Fig. 4 to Fig. 6 is the concrete device realizing the inventive method, and the electric elements adopted in these 3 embodiments are mainly switch element, and described switch element judges electric current commutation signal for performing.
Figure 4 shows that the first embodiment of the parasitic inverter of the present invention, described parasitic inverter is a high-power parasitic inverter, described using IGBT pipe as embodiment below, those skilled in the art understand, described IGBT pipe can replace with metal-oxide-semiconductor, described change does not affect the enforcement of the present embodiment, does not repeat them here.Wherein, the relative constant flow regulation circuit 201 of DC/DC is made up of an IGBT pipe M1, the 2nd IGBT pipe M2, the 3rd IGBT pipe M3, the 4th IGBT pipe M4, the 3rd resistance R3 and the 4th R4, and zero passage change of current assembly 202 is made up of the first photoelectrical coupler OP1, the second photoelectrical coupler OP2, the first resistance R1 and the second resistance R2.
Further, first photoelectrical coupler OP1 is encapsulated by the first LED 1 and the first photoconductive tube RL1 and forms, second photoelectrical coupler OP2 is encapsulated by the second LED 2 and the second photoconductive tube PL2 and forms, first resistance R1 one end connects the live wire of described public electric wire net, the other end connects the negative electrode of the first LED 1 and the anode of the second LED 2, second resistance R2 one end connects the zero line of described public electric wire net, the other end connects the anode of the first LED 1 and the negative electrode of the second LED 2, first photoconductive tube RL1 and the second photoconductive tube RL2 is as the signal output part of zero passage change of current assembly 202, connect the input of the zero passage change of current signal of the relative constant flow regulation circuit 201 of DC/DC respectively.
Closer, one IGBT pipe M1 and the collector electrode of the 3rd IGBT pipe M3 are connected to the direct current energy input anode of the relative constant flow regulation circuit 201 of DC/DC jointly, connect the 400V direct current that solar panel array exports, 2nd IGBT pipe M2 and the emitter of the 4th IGBT pipe M4 are connected to the direct current energy input negative terminal COM of the relative constant flow regulation circuit 201 of DC/DC jointly, emitter and the collector electrode of the 2nd IGBT pipe of the one IGBT pipe are connected the direct current energy output of the relative constant flow regulation circuit 201 of DC/DC jointly, emitter and the collector electrode of the 4th IGBT pipe M4 of the 3rd IGBT pipe M3 are connected the direct current energy output of the relative constant flow regulation circuit 201 of DC/DC jointly, a described IGBT pipe is connected the first photoconductive tube RL1 in the first photoelectrical coupler OP1 jointly with the grid of the 4th IGBT pipe, also connect one end of the 4th resistance R4, the other end of the 4th resistance R4 connects the direct current energy input anode of the relative constant flow regulation circuit 201 of DC/DC, 2nd IGBT pipe M2 is connected the second photoconductive tube RL2 in the second photoelectrical coupler OP2 jointly with the grid of the 3rd IGBT pipe M3, also connect one end of the 3rd resistance R3, the other end of the 3rd resistance R3 connects the direct current energy input anode of the relative constant flow regulation circuit 201 of DC/DC.
As shown in Figure 4, DC/DC 1,2 ends elementary with isolating transformer 107 respectively relative to constant flow regulation circuit 201 two outputs connect, 3, the 4 termination public electric wire nets that isolating transformer is secondary.
Take public electric wire net as the alternating current of 220V, 3 ends connecing isolating transformer 107 when public electric wire net are just, 4 ends are for time negative, second photoelectrical coupler OP2 conducting, one IGBT pipe M1 goes out high level, and the 4th IGBT pipe M4 goes out low level, makes 1 terminal voltage of isolating transformer higher than 2 ends; Be negative when public electric wire net becomes 3 ends connecing isolating transformer 107,4 ends are timing, the first photoelectrical coupler OP1 conducting, and the 2nd IGBT pipe M2 goes out low level, and the 3rd IGBT pipe M3 goes out high level, and cause 1 end of isolating transformer to be electronegative potential, 2 ends are high potential.Like this, electric energy is adhered to and electrical network by the direct current energy of isolating transformer 107, the output of inversion electric energy is carried out according to the waveform of electrical network and frequency, and being consistent of the waveform of electric energy exported and frequency and electrical network, namely form parasitism between described output electric energy and electrical network electric energy, the frequency as power frequency is 50Hz i.e. parasitic one-tenth 50Hz, and the frequency of power frequency is that 60Hz i.e. parasitism becomes 60Hz, power frequency is 1Hz and parasitic 1Hz, and power frequency is 0Hz and spurious dc electricity.But parasitic and low frequency or direct current just can not adopt power frequency isolation transformer, because direct current or approximate DC electricity are not by transformer coupled transmission.
Fig. 5 is the second embodiment of the parasitic inverter of the present invention, described inverter is the parasitic inverter of a high-power non-isolated, with the first embodiment difference be, the electric energy that inverter exports is connected to the grid after low pass filter F1 process, and two outputs of the relative constant flow regulation circuit 201 of 1 of low pass filter, 2 termination DC/DC, 3,4 termination public electric wire nets.
In like manner, take public electric wire net as the alternating current of 220V, 3 ends connecing low pass filter when public electric wire net are just, when 4 ends are for bearing, the second photoelectrical coupler OP2 conducting, an IGBT pipe M1 goes out high level, 4th IGBT pipe M4 goes out low level, causes 1 terminal potential of low pass filter F1 higher than 2 terminal potentials; Be negative when public electric wire net becomes 3 ends connecing low pass filter, 4 ends are timing, the first photoelectrical coupler OP1 conducting, and the 2nd IGBT pipe 2 goes out low Dan Ping, and the 3rd IGBT pipe 3 goes out high level, cause 1 terminal potential of low pass filter lower than 2 terminal potentials.Like this, electric energy, by the attachment of the direct current energy of low pass filter and electrical network, carries out the output of inversion electric energy according to the waveform of electrical network and frequency, and being consistent of the waveform of the electric energy exported and frequency and electrical network.
Fig. 6 is the 3rd embodiment of the parasitic inverter of the present invention, described inverter is the parasitic inverter of a small-power, the relative constant flow regulation circuit 201 of DC/DC of described inverter is made up of the first operational amplifier IC1A, the second operational amplifier IC1B, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7 and the 8th resistance R8, owing to being be applicable to low power occasion, therefore adopt operational amplifier.Electric energy after inversion exports 1,2 ends of isolating transformer to, 3,4 termination public electric wire nets of isolating transformer.
In the present embodiment, for the alternating current of 12V for public electric wire net, when public electric wire net 3 end is just, 4 ends are for time negative, second photoelectrical coupler OP2 conducting, the first operational amplifier IC1A goes out high level, and the second operational amplifier IC1B goes out low level, make isolating transformer 1 end be high potential, 2 ends are electronegative potential; When 3 ends of public electric wire net are negative, 4 ends are timing, first photoelectrical coupler OP1 conducting, first operational amplifier IC1A goes out electronegative potential, second operational amplifier IC1B goes out high level, and cause 1 end of isolating transformer to be electronegative potential, 2 ends are high potential, such electric energy is adhered to and electrical network by the direct current energy of isolating transformer, and the waveform of electrical network and frequency no requirement (NR).
In an application circumstances, when the output of parasitic inverter of the present invention does not get access to grid, inverter cannot realize reversals, and therefore, inverter in this case only plays DC constant flowing power.
In conjunction with the schematic diagram of the of the present invention parasitic inverter shown in above-mentioned Fig. 2 to Fig. 6, the present invention also provides a kind of parasitic inverse method, first performs step 1). from public electric wire net, carry out signal of telecommunication sampling; Perform step 2 again). according to the sampled result in step 1), when the electric signal waveform in public electric wire net commutates, zero change of current assembly generates electric current commutation signal; Finally performing step 3). described electric current commutation signal is sent to the relative constant flow regulation circuit of DC/DC by zero change of current assembly.Those skilled in the art understand, the direct current controlled through the zero passage change of current is injected electrical network, and produce the inversion electric energy the same with the use result of conventional inverter, be namely host with electrical network, the direct current power of one constant current is injected electrical network, waveform is lifted by electrical network sine and is formed, and namely forms parasitism.With reference to figure 3a to Fig. 3 d, the fluctuations of the alternating current of the grid-connected middle different wave of cooperation initiatively of the direct current after grid-connected, and almost need adjustment without any power factor (PF).
The electrical network sine of the electric energy energy Initial adaption distortion that this parasitic dc exports involves multiple different frequency and irregular waveform, the voltage of electric energy in electrical network and frequency are not limited, the grid-connected of the different electrical network in each department can be adapted to, there is utilization rate of electrical simultaneously high, the advantage of the excellent performance of electromagnetism interference.
Technology contents of the present invention and technical characteristic have disclosed as above; but those of ordinary skill in the art still may do all replacement and the modification that do not deviate from spirit of the present invention based on teaching of the present invention and announcement; therefore; scope should be not limited to the content that embodiment discloses; and various do not deviate from replacement of the present invention and modification should be comprised, and contained by present patent application claim.
Claims (10)
1. a parasitic inverse method, is characterized in that, comprises the steps:
Directly from public electric wire net, signal of telecommunication sampling is carried out by zero passage change of current assembly;
When the electric signal waveform commutation of sampling, generate electric current commutation signal by described zero passage change of current assembly;
By described zero passage change of current assembly, described electric current commutation signal is sent to the relative constant flow regulation circuit of DC/DC;
According to electric current commutation signal, by the relative constant flow regulation circuit of described DC/DC, the sense of current commutation that direct current is inputted;
The direct current of described commutation is input in public electric wire net, to parasitize on alternating current envelope.
2. parasitic inverse method according to claim 1, is characterized in that, the step that zero passage change of current assembly carries out signal of telecommunication sampling from public electric wire net comprises: from public electric wire net, carry out current sample and voltage sample.
3. parasitic inverse method according to claim 2, is characterized in that, when the electric signal waveform commutation of sampling, the step that zero passage change of current assembly generates electric current commutation signal comprises the steps:
Judge the sense of current, if the sense of current is just, then the first switch conduction in zero passage change of current assembly; If the sense of current is negative, then the second switch conducting in zero passage change of current assembly;
When described first switch and described second switch switched conductive, generate electric current commutation signal by zero passage change of current assembly.
4. parasitic inverse method according to claim 2, is characterized in that, in the step of the sense of current commutation that direct current inputs according to electric current commutation signal by the relative constant flow regulation circuit of described DC/DC, comprises the steps:
The direct current that continuous reception transmits from direct current energy input;
Judge currently whether receive described electric current commutation signal, if receive electric current commutation signal, then direct current is commutated; If do not receive electric current commutation signal, then do not deal with.
5. parasitic inverse method according to claim 2, is characterized in that, is input to by the direct current of described commutation in the step in public electric wire net, comprises the steps:
The direct current of commutation is sent to primary;
At the secondary generation electric current of transformer, the electric current of the secondary generation of described transformer to colonize in public electric wire net on original electric current.
6. a parasitic inverter, it is characterized in that, comprise the relative constant flow regulation circuit of DC/DC, the direct current energy input of the relative constant flow regulation circuit of described DC/DC connects solar panel array, its direct current energy output directly connects public electric wire net, also comprise zero passage change of current assembly, described zero passage change of current component inputs connects described public electric wire net, its output connects the input of the zero passage change of current signal of the relative constant flow regulation circuit of described DC/DC, described zero passage change of current assembly is sampled from the signal of telecommunication described public electric wire net, when electric signal waveform in public electric wire net commutates, described zero passage change of current assembly sends the direct current commutation that change of current signal makes the relative constant flow regulation circuit of described DC/DC export.
7. parasitic inverter according to claim 6, it is characterized in that, described zero passage change of current assembly comprises the first photoelectrical coupler, first resistance, second photoelectrical coupler and the second resistance, described first photoelectrical coupler is encapsulated by the first light-emitting diode and the first photoconductive tube and forms, described second photoelectrical coupler is encapsulated by the second light-emitting diode and the second photoconductive tube and forms, described first resistance one end connects the live wire of described public electric wire net, the other end connects the negative electrode of described first light-emitting diode and the anode of described second light-emitting diode, described second resistance one end connects the zero line of described public electric wire net, the other end connects the anode of described first light-emitting diode and the negative electrode of described second light-emitting diode, described first photoconductive tube and described second photoconductive tube are as two signal output parts of described zero passage change of current assembly, connect the input of the zero passage change of current signal of the relative constant flow regulation circuit of described DC/DC respectively.
8. parasitic inverter according to claim 7, it is characterized in that, the relative constant flow regulation circuit of described DC/DC is managed by an IGBT, 2nd IGBT pipe, 3rd IGBT pipe, 4th IGBT pipe, 3rd resistance and the 4th resistance composition, a described IGBT pipe and the collector electrode of the 3rd IGBT pipe are connected to the direct current energy input anode of the relative constant flow regulation circuit of described DC/DC jointly, described 2nd IGBT pipe and the emitter of described 4th IGBT pipe are connected to the direct current energy input negative terminal of the relative constant flow regulation circuit of described DC/DC jointly, emitter and the collector electrode of described 2nd IGBT pipe of a described IGBT pipe are connected the direct current energy output of the relative constant flow regulation circuit of described DC/DC jointly, emitter and the collector electrode of described 4th IGBT pipe of described 3rd IGBT pipe are connected the direct current energy output of the relative constant flow regulation circuit of described DC/DC jointly, a described IGBT pipe is connected the first photoconductive tube in described first photoelectrical coupler jointly with the grid of the 4th IGBT pipe, also connect one end of described 4th resistance, the other end of described 4th resistance connects the direct current energy input anode of the relative constant flow regulation circuit of described DC/DC, described 2nd IGBT pipe is connected the second photoconductive tube in described second photoelectrical coupler jointly with the grid of described 3rd IGBT pipe, also connect one end of described 3rd resistance, the other end of described 3rd resistance connects the direct current energy input anode of the relative constant flow regulation circuit of described DC/DC.
9. parasitic inverter according to claim 8, is characterized in that, described IGBT pipe can replace with metal-oxide-semiconductor.
10. parasitic inverter according to claim 7, it is characterized in that, the relative constant flow regulation circuit of described DC/DC is by the first operational amplifier, second operational amplifier, 5th resistance, 6th resistance, 7th resistance and the 8th resistance composition, the input in the same way of described first operational amplifier is connected the first photoconductive tube in described first photoelectrical coupler jointly with the reverse input end of described second operation method device, also connect one end of described 6th resistance, the other end of described 6th resistance connects the direct current energy input anode of the relative constant flow regulation circuit of described DC/DC, the input in the same way of described second operational amplifier is connected the second photoconductive tube in described second photoelectrical coupler jointly with the reverse input end of described first operation method device, also connect one end of described 5th resistance, the other end of described 5th resistance connects the direct current energy input anode of the relative constant flow regulation circuit of described DC/DC, the output of described first operational amplifier connects one end of the 7th resistance, the other end of described 7th resistance connects the direct current energy output of the relative constant flow regulation circuit of described DC/DC, the output of described second operational amplifier connects one end of the 8th resistance, the other end of described 8th resistance connects the direct current energy output of the relative constant flow regulation circuit of described DC/DC, described first operational amplifier is connected the direct current energy input anode of the relative constant flow regulation circuit of described DC/DC with the voltage input anode of the second operational amplifier, the voltage input negativing ending grounding of described first operational amplifier and the second operational amplifier.
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| CN201110083188.7A CN102739094B (en) | 2011-04-02 | 2011-04-02 | A kind of parasitic inverse method and device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1554913A (en) * | 2003-12-29 | 2004-12-15 | 上海诚意电器有限公司 | Solar photovoltaic integrally incoporating controller and method |
| CN1988310A (en) * | 2006-11-09 | 2007-06-27 | 上海大学 | Current source type photovoltiac parallel-in system and its control device and method |
| CN201966825U (en) * | 2010-12-13 | 2011-09-07 | 苏州汉风电气设备有限公司 | Parasitic dc-to-ac converter is incorporated into the power networks |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1554913A (en) * | 2003-12-29 | 2004-12-15 | 上海诚意电器有限公司 | Solar photovoltaic integrally incoporating controller and method |
| CN1988310A (en) * | 2006-11-09 | 2007-06-27 | 上海大学 | Current source type photovoltiac parallel-in system and its control device and method |
| CN201966825U (en) * | 2010-12-13 | 2011-09-07 | 苏州汉风电气设备有限公司 | Parasitic dc-to-ac converter is incorporated into the power networks |
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