CN202121514U - Single-phase inverter capable of eliminating direct current input terminal ripple and solar photovoltaic power generation system - Google Patents
Single-phase inverter capable of eliminating direct current input terminal ripple and solar photovoltaic power generation system Download PDFInfo
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Abstract
The utility model provides a single-phase inverter capable of eliminating the direct current input terminal ripple. The single-phase inverter is connected between a direct current input and an alternating current output. The single-phase inverter includes a direct current detecting circuit, an alternating current detecting circuit, a direct current-direct current converting circuit, a direct current-alternating current converting circuit, an electrical power conversion control circuit, and a ripple eliminating unit. The ripple eliminating unit eliminates the ripple on a direct current input terminal based on an input direct current electrical signal and an output alternating current electrical signal. The ripple eliminating unit includes a ripple control device which controls the working mode of the ripple eliminating unit based on the input direct current electrical signal and the output alternating current electrical signal, an energy storage unit which stores or releases the energy of the direct current input terminal, and an energy storage controller which controls the on/off states of the energy storage unit. A solar photovoltaic power generation system is also provided. The single-phase inverter uses the ripple elimination unit to detect the ripple power and to control the working mode of the converting circuit. The voltage of a capacitor changes along with the change of an energy ripple form, the energy of the capacitor can be controlled to be equal to the ripple power, so the charging and discharging are realized, and consequently the ripple of the direct current input terminal is eliminated.
Description
Technical field
The utility model relates to the power conversions technical field, and specifically, the utility model relates to a kind of single-phase inverter and solar photovoltaic generation system of eliminating the direct-flow input end ripple.
Background technology
A lot of regenerative resources produce direct current, for example photovoltaic and chemical cell.Direct current converts the sinusoidal ac of fixed frequency into through inverter, is transferred to electrical network or uses from net.
The inverter of solar photovoltaic generation system trends towards adopting distributed miniature inverter (little inverter) recently.Miniature inverter provides the maximum power point control to each direct current photovoltaic module, thereby makes each direct current photovoltaic module produce maximum energy, improves the performance of whole solar photovoltaic generation system.In addition, miniature inverter can also produce AC low-tension output, rather than the output of the High Level DC Voltage of center type inverter system, has improved the fail safe and the operating efficiency of system.
Fig. 1 is the structural representation of a single-phase inverter of the prior art.As shown in the figure; This single-phase inverter 100 is connected between solar panels 101 and the electrical network 102, and it can comprise dc detection circuit 103, DC-to-dc change-over circuit 104, dc-ac conversion circuit 105, AC detection circuit 106 and power conversions control circuit 107.Wherein, dc detection circuit 103 is connected with solar panels 101, is used to detect the dc signal (comprising input voltage and electric current at least) of input; AC detection circuit 106 is connected with electrical network 102, is used to detect the ac signal (comprising output voltage and electric current at least) of output; DC-to-dc change-over circuit 104 is connected with dc detection circuit 103, is used for dc signal is boosted and voltage stabilizing; Dc-ac conversion circuit 105 is connected with AC detection circuit 106 with DC-to-dc change-over circuit 104 respectively, is used for converting direct current to alternating current; And power conversions control circuit 107 is connected with dc detection circuit 103, AC detection circuit 106, DC-to-dc change-over circuit 104 and dc-ac conversion circuit 105 respectively; Through reference current control switch (not shown), make inverter 100 produce the synchronous output AC of alternating voltage with electrical network 102 according to input voltage and electric current and output voltage and electric current.
A fundamental characteristics of single-phase inverter is: the power transfer between power supply and load comprises the ripple of average energy and double frequency.Inverter hopes to obtain the direct current that does not have ripple from DC power supply, then average energy and ripple energy is passed to output loading, and will ask like this has energy storage units to handle ripple energy in the inverter.In the structural representation of the single-phase inverter of prior art as shown in Figure 1, inverter 100 produces the power output with AC network 102 energy homophases, shakes between the zero-sum maximum output so export energy.When the power output of inverter 100 was zero, the electric current of photovoltaic module did not flow through inverter 100, so give storage capacitance (not shown) charging; When the power output of inverter 100 was peak value, the storage capacitance discharge replenished the power of photovoltaic module, makes peak value reach the twice of mean value.So the discharging and recharging of storage capacitance formed additional alternating component on the direct current that photovoltaic module provides, and is called ripple power.
Be the ripple power of management double frequency, energy demand is by frequency storage and release in twice.For avoiding energy exchange to cause big voltage ripple, need to use big capacitor C.Fig. 2 is the simple circuit structure sketch map of a single-phase back exciting converter of the prior art.As shown in the figure, the direct-flow input end of this single-phase back exciting converter 200 is provided with big capacitor C, reduces the energy storage and discharges the ripple voltage that produces.It is example that the single-phase back exciting converter 200 here instead swashs with single channel, but two-way or multichannel ground interleaving inverse excitation also are similar situation.
The big capacity electrochemical capacitor that common inverter is employed in the direct current main line is as passive filter, but electrochemical capacitor has multiple failure mode, particularly ripple current to cause the inner self-heating of electric capacity, reduces the life-span.Initiatively filter circuit is substituted passive method by broad research, through the energy conversion circuit that separates another ripple is provided, and this ripple balances out bifrequency ripple power, but this method needs complicated circuitry and control method.
So needs can be eliminated the ripple power of DC side input in the single-phase inverter simply.
Summary of the invention
The utility model technical problem to be solved provides a kind of single-phase inverter and solar photovoltaic generation system of eliminating the direct-flow input end ripple, can eliminate the ripple power of single-phase inverter DC side input simply.
For solving the problems of the technologies described above, the utility model provides a kind of single-phase inverter of eliminating the direct-flow input end ripple, is connected between direct current input and the interchange output, comprising:
Dc detection circuit is connected with said direct current input, is used to detect the dc signal of input;
AC detection circuit, with said exchange output be connected, be used to detect the ac signal of output;
The DC-to-dc change-over circuit is connected with said dc detection circuit, is used for said dc signal is boosted;
Dc-ac conversion circuit is connected with AC detection circuit with the DC-to-dc change-over circuit respectively, is used for converting said direct current to said alternating current;
The power conversions control circuit; Be connected with said dc-ac conversion circuit with said dc detection circuit, said AC detection circuit, said DC-to-dc change-over circuit respectively; Be used for passing through the reference current control switch, said single-phase inverter is produced and the synchronous output AC of said alternating voltage according to the direct voltage of input and the alternating voltage and the electric current of electric current and output; And
Ripple is eliminated the unit; Be connected with said dc detection circuit, said AC detection circuit and said dc-ac conversion circuit respectively, be used for eliminating the ripple of said single-phase inverter direct-flow input end according to the ac signal of dc signal of importing and output;
Wherein, said ripple is eliminated the unit and is comprised:
The ripple control device is connected with said AC detection circuit with said dc detection circuit respectively, is used for controlling the mode of operation that said ripple is eliminated the unit according to the dc signal of input and the ac signal of output;
Energy storage unit is connected with said DC-to-dc change-over circuit, is used to store or discharge the energy of said direct-flow input end; And
The energy storage controller is connected with said energy storage unit with said ripple control device respectively, is used for the instruction according to said ripple control device, controls the switch of said energy storage unit, carries out the storage and the release of said energy.
Alternatively, said energy storage unit is for boosting-the reducing two-way transducer.
Alternatively, said energy storage unit comprises secondary coil, inductance, electric capacity, first switching tube, second switch pipe, first diode and second diode of said transducer, wherein:
The main sideline circle of said secondary coil and said transducer is coupled;
First end of said inductance is connected with first end of said secondary coil, and second end of said inductance is connected to first end of said electric capacity through said second switch pipe;
Second end of said electric capacity is connected to second end of said secondary coil;
Said first switching tube is connected across between second end of second end and said secondary coil of said inductance;
Said first switching tube and said second switch pipe through said its switch of energy storage controller control, are carried out the storage and the release of said energy respectively;
Said first diode and said second diode are connected in parallel on said first switching tube and said second switch pipe two ends respectively; The positive pole of said first diode is connected to second end of said secondary coil; The negative pole of said first diode is connected to second end of said inductance; The positive pole of said second diode is connected to second end of said inductance, and the negative pole of said second diode is connected to first end of said electric capacity.
Alternatively, the said ripple mode of operation of eliminating the unit comprises: charge mode and discharge mode.
Alternatively, said ripple control device, said energy storage controller and said power conversions controller are integrated in the same circuit.
Alternatively,, said ripple control device, said energy storage controller and said power conversions controller are realized with FPGA, CPU, MCU, DSP or ASIC.
Correspondingly, the utility model also provides a kind of solar photovoltaic generation system, comprises one or more single-phase inverter, and said single-phase inverter is connected between solar panels and the electrical network, and said single-phase inverter comprises:
Dc detection circuit is connected with said solar panels, is used to detect the dc signal of input;
AC detection circuit is connected with said electrical network, is used to detect the ac signal of output;
The DC-to-dc change-over circuit is connected with said dc detection circuit, is used for said dc signal is boosted;
Dc-ac conversion circuit is connected with AC detection circuit with the DC-to-dc change-over circuit respectively, is used for converting said direct current to said alternating current;
The power conversions control circuit; Be connected with said dc-ac conversion circuit with said dc detection circuit, said AC detection circuit, said DC-to-dc change-over circuit respectively; Be used for passing through the reference current control switch, said single-phase inverter is produced and the synchronous output AC of said alternating voltage according to the direct voltage of input and the alternating voltage and the electric current of electric current and output; And
Ripple is eliminated the unit; Be connected with said dc detection circuit, said AC detection circuit and said dc-ac conversion circuit respectively, be used for eliminating the ripple of said single-phase inverter direct-flow input end according to the ac signal of dc signal of importing and output;
Wherein, said ripple is eliminated the unit and is comprised:
The ripple control device is connected with said AC detection circuit with said dc detection circuit respectively, is used for controlling the mode of operation that said ripple is eliminated the unit according to the dc signal of input and the ac signal of output;
Energy storage unit is connected with said DC-to-dc change-over circuit, is used to store or discharge the energy of said direct-flow input end; And
The energy storage controller is connected with said energy storage unit with said ripple control device respectively, is used for the instruction according to said ripple control device, controls the switch of said energy storage unit, carries out the storage and the release of said energy.
Alternatively, said energy storage unit is for boosting-the reducing two-way transducer.
Alternatively, said energy storage unit comprises secondary coil, inductance, electric capacity, first switching tube, second switch pipe, first diode and second diode of said transducer, wherein:
The main sideline circle of said secondary coil and said transducer is coupled;
First end of said inductance is connected with first end of said secondary coil, and second end of said inductance is connected to first end of said electric capacity through said second switch pipe;
Second end of said electric capacity is connected to second end of said secondary coil;
Said first switching tube is connected across between second end of second end and said secondary coil of said inductance;
Said first switching tube and said second switch pipe through said its switch of energy storage controller control, are carried out the storage and the release of said energy respectively;
Said first diode and said second diode are connected in parallel on said first switching tube and said second switch pipe two ends respectively; The positive pole of said first diode is connected to second end of said secondary coil; The negative pole of said first diode is connected to second end of said inductance; The positive pole of said second diode is connected to second end of said inductance, and the negative pole of said second diode is connected to first end of said electric capacity.
Alternatively, the said ripple mode of operation of eliminating the unit comprises: charge mode and discharge mode.
Alternatively, said ripple control device, said energy storage controller and said power conversions controller are integrated in the same circuit.
Alternatively, said ripple control device, said energy storage controller and said power conversions controller are realized with FPGA, CPU, MCU, DSP or ASIC.
Compared with prior art, the utlity model has following advantage:
The single-phase inverter of the utility model has increased ripple and has eliminated the unit, through detecting ripple power, the mode of operation of change-over circuit in the control energy storage element.When the input direct current power is higher than power output, be charge mode, the energy storage unit storage power.When the input direct current power is lower than power output, be discharge mode, energy storage unit releases energy and replenishes to output.Eliminate the switch of unit internal conversion circuit through the control ripple; Voltage on the electric capacity changes with energy waveform; Voltage on it and energy stored decision capacitance; The energy of electric capacity can be controlled as and be equal to double frequency ripple power, realizes discharging and recharging, thus the double frequency ripple of elimination single-phase inverter DC side input.
Description of drawings
The utility model above-mentioned and other characteristic, character and advantage will become more obvious through the description below in conjunction with accompanying drawing and embodiment, wherein:
Fig. 1 is the structural representation of a single-phase inverter of the prior art;
Fig. 2 is the simple circuit structure sketch map of a single-phase back exciting converter of the prior art;
Fig. 3 is the modular structure sketch map of single-phase inverter of the elimination direct-flow input end ripple of an embodiment of the utility model;
Fig. 4 is the simple circuit structure sketch map of single-phase back exciting converter of the elimination direct-flow input end ripple of an embodiment of the utility model;
Fig. 5 is that the ripple in the single-phase back exciting converter of elimination direct-flow input end ripple of an embodiment of the utility model is eliminated the simple circuit structure sketch map of cell operation when charge mode;
Fig. 6 is that the ripple in the single-phase back exciting converter of elimination direct-flow input end ripple of an embodiment of the utility model is eliminated the simple circuit structure sketch map of cell operation when discharge mode;
Fig. 7 is the rough schematic of a series of activities waveform of single-phase inverter of the elimination direct-flow input end ripple of an embodiment of the utility model.
Embodiment
Below in conjunction with specific embodiment and accompanying drawing the utility model is described further; Set forth more details in the following description so that make much of the utility model; But the utility model obviously can be implemented with multiple this description ground alternate manner that is different from; Therefore those skilled in the art can do similar popularization, deduction according to practical situations under the situation of the utility model intension, should be with the protection range of content constraints the utility model of this specific embodiment.
Eliminate an embodiment of the single-phase inverter of direct-flow input end ripple
Fig. 3 is the modular structure sketch map of single-phase inverter of the elimination direct-flow input end ripple of an embodiment of the utility model.As shown in the figure, this single-phase inverter 300 is connected in as the solar panels 301 of direct current input with as between the electrical network 302 that exchanges output.Wherein, single-phase inverter 300 can include but not limited to: dc detection circuit 303, AC detection circuit 306, DC-to-dc change-over circuit 304, dc-ac conversion circuit 305, power conversions control circuit 307 and ripple are eliminated unit 310.Ripple is eliminated unit 310 and is coupled with DC-to-dc change-over circuit 304.
In the present embodiment, dc detection circuit 303 can be connected with solar panels 301, is used to detect the dc signal of input; AC detection circuit 306 can be connected with AC network 302, is used to detect the ac signal of output; DC-to-dc change-over circuit 304 can be connected with dc detection circuit 303, is used for dc signal is boosted; Dc-ac conversion circuit 305 can be connected with AC detection circuit 306 with DC-to-dc change-over circuit 304 respectively, is used for converting direct current to alternating current; Power conversions control circuit 307 can be connected with dc detection circuit 303, AC detection circuit 306, DC-to-dc change-over circuit 304 and dc-ac conversion circuit 305 respectively; Be used for passing through reference current control switch (not shown), single-phase inverter 300 is produced and the synchronous output ACs of alternating voltage according to the direct voltage of input and the alternating voltage and the electric current of electric current and output; And ripple eliminates unit 310 and can be connected with dc detection circuit 303, AC detection circuit 306 and dc-ac conversion circuit 305 respectively, is used for the ripple according to ac signal elimination single-phase inverter 300 direct-flow input ends of the dc signal of input and output.
Wherein, the elimination of the ripple in present embodiment unit 310 can further be decomposed into and comprise ripple control device 311, energy storage unit 313 and energy storage controller 312.Wherein ripple control device 311 can be connected with AC detection circuit 306 with dc detection circuit 303 respectively, is used for controlling the mode of operation that ripple is eliminated unit 310 according to the dc signal of input and the ac signal of output: charge mode and discharge mode; Energy storage unit 313 can be connected with DC-to-dc change-over circuit 304, is used to store or discharge the energy of direct-flow input end; And energy storage controller 312 can be connected with energy storage unit 313 with ripple control device 311 respectively, is used for the instruction according to ripple control device 311, and the switch of control energy storage element 313 is carried out the storage and the release of energy.
Fig. 4 is the simple circuit structure sketch map of single-phase back exciting converter of the elimination direct-flow input end ripple of an embodiment of the utility model.As shown in the figure; In this single-phase back exciting converter 400; Energy storage unit 413 is for boosting-the reducing two-way transducer, and it can comprise secondary coil Tr, inductance L r, storage capacitor Cr, a MOS switching tube Qr1, the 2nd MOS switching tube Qr2, the first diode Dr1 (body diode that the first diode Dr1 also can a MOS switching tube Qr1) and the second diode Dr2 (the second diode Dr2 also can be exactly the body diode of the 2nd MOS switching tube Qr2) of transducer.
In the present embodiment, secondary coil Tr can be coupled with the main sideline circle of transducer; First end of inductance L r can be connected with first end of secondary coil Tr, and second end of inductance L r can be connected to first end of capacitor C r through the 2nd MOS switching tube Qr2; Second end of capacitor C r can be connected to second end of secondary coil Tr; The one MOS switching tube Qr1 is connected across between second end of second end and secondary coil Tr of inductance L r; The one MOS switching tube Qr1 and the 2nd MOS switching tube Qr2 through energy storage controller 412 its switches of control, carry out the storage and the release of energy respectively; The first diode Dr1 and the second diode Dr2 are connected in parallel on a MOS switching tube Qr1 and the 2nd MOS switching tube Qr2 two ends respectively; The positive pole of the first diode Dr1 is connected to second end of secondary coil Tr; The negative pole of the first diode Dr1 is connected to second end of inductance L r; The positive pole of the second diode Dr2 is connected to second end of inductance L r, and the negative pole of the second diode Dr2 is connected to first end of capacitor C r.
In single-phase back exciting converter 400 shown in Figure 4, when the 2nd MOS switching tube Qr2 keeps shut, this transducer is by the stepup transformer of transformer Tr to capacitor C r; When a MOS switching tube Qr1 keeps shut, this transducer is by the reducing transformer of capacitor C r to transformer Tr.
The storage capacitor Cr in the ripple elimination unit and the input of inverter 400 are isolated, and can reach higher voltage, thereby can use littler electric capacity for identical energy.
Do to introduce in detail further in the face of the operation principle of the single-phase inverter of the elimination direct-flow input end ripple of an embodiment of the utility model down.
For average output power Po and a-c cycle f, if ignore transition loss, input power is made up of the ripple of direct current component Pdc and double mains frequency.DC power supply only provides direct current component Po, so energy storage unit need provide double frequency part Po cos (2wt).Suppose that power output is p
o(t), work as p
o(t)＞during Po, energy storage unit releases energy to output; Work as p
o(t)＜during Po, energy storage unit stores the unnecessary energy of DC power supply.
Ripple is eliminated the charge mode of unit: p
o(t)＜and Po, energy storage unit stores the unnecessary energy Po-p of DC power supply
o(t).Fig. 5 is that the ripple in the single-phase back exciting converter of elimination direct-flow input end ripple of an embodiment of the utility model is eliminated the simple circuit structure sketch map of cell operation when charge mode.As shown in Figure 5, when the 2nd MOS switching tube Qr2 closes, energy storage unit be one by the coil of transformer Tr booster circuit to capacitor C r.When main switch Q conducting and a MOS switching tube Qr1 closed, the energy storage of DC power supply DC was to the former limit of main transformer, and the electric energy in the inductance L r is transferred to capacitor C r through the second diode Dr2 simultaneously.When main switch Q closes and during a MOS switching tube Qr1 conducting, the electric energy in the main transformer is transferred to simultaneously and exchanges output and the interior inductance L r of energy storage unit.The drive signal of a main switch Q and a MOS switching tube Qr1 is complementary, all is to be operated in high frequency, such as 100kHz～1MHz.Through booster circuit, the voltage on the capacitor C r is higher than the output of transformer Tr, and the ratio of boosting can recently be controlled through the duty of a MOS switching tube Qr1 switch.
Ripple is eliminated the discharge mode of unit: p
o(t)＞and Po, the electric energy of energy storage unit release stored replenishes and gives output p
o(t)-Po.Fig. 6 is that the ripple in the single-phase back exciting converter of elimination direct-flow input end ripple of an embodiment of the utility model is eliminated the simple circuit structure sketch map of cell operation when discharge mode.As shown in Figure 6, when a MOS switching tube Qr1 closes, energy storage unit is the reduction voltage circuit of capacitor C r to transformer Tr.When main switch Q closes and during the 2nd MOS switching tube Qr2 conducting, the energy Pr in the capacitor C r is transferred to inductance L r, the power transfer in the transformer is given output simultaneously.When main switch Q conducting and the 2nd MOS switching tube Qr2 closed, the energy Pr among the inductance L r was transferred to transformer Tr through the first diode Dr1.The drive signal of a main switch Q and a MOS switching tube Qr1 is complementary, all is to be operated in high frequency, such as 100kHz～1MHz.Through reduction voltage circuit, the voltage on the capacitor C r is higher than the output of transformer Tr, and the ratio of step-down can recently be controlled through the duty of the 2nd MOS switching tube Qr2 switch.
Fig. 7 is the rough schematic of a series of activities waveform of single-phase inverter of the elimination direct-flow input end ripple of an embodiment of the utility model.As shown in the figure, be followed successively by from top to bottom: the drive signal of the drive signal of the output voltage of single-phase inverter and current waveform, power waveform, the first switching tube Qr1, second switch pipe Qr2 and the drive signal of main switch Q.Wherein the control of the switch of main switch Q, the first switching tube Qr1 and second switch pipe Qr2 is as above described.
In the present embodiment, the mode of the mode of operation of control energy storage element has following three kinds at least:
A kind of is more instant power output p
o(t) with average output power Po.AC detection circuit detects output voltage and electric current, calculates instant power output p
o(t) and average output power Po.Compare power output p
o(t) and average output power Po come the Control work pattern.Work as p
o(t)＞during Po, be discharge mode; Work as p
o(t)＜during Po, be charge mode.
A kind of is more instant input power p
In(t) with Mean Input Power Pdc.Dc detection circuit detects input voltage and electric current, calculates instant input power p
In(t) and Mean Input Power Pdc.Compare input power p
In(t) and Mean Input Power Pdc come the Control work pattern.Work as P
In(t)＞during Pdc, be discharge mode.Work as P
In(t)＜during Pdc, be charge mode.
Another kind of for using the alternating current zero crossing point control.AC detection circuit detects voltage over zero, is made as 0 phase place, then+and π/4 phase points are the transition point that ripple is eliminated pattern.If by just bearing, ripple control is transformed to discharge mode by charge mode at zero crossing voltage.If at zero crossing voltage by just to negative, ripple control is transformed to charge mode by discharge mode.
An embodiment with solar photovoltaic generation system of the single-phase inverter of eliminating the direct-flow input end ripple
In the solar photovoltaic generation system of an embodiment of the utility model, comprise one or more single-phase inverter, this single-phase inverter is connected between solar panels and the electrical network.Still by the solar energy photovoltaic system of Fig. 3 to Fig. 7 to the utility model, single-phase inverter is especially wherein described in detail below.
Fig. 3 is the modular structure sketch map of single-phase inverter of the elimination direct-flow input end ripple of an embodiment of the utility model.As shown in the figure, this single-phase inverter 300 is connected between solar panels 301 and the electrical network 302.Wherein, single-phase inverter 300 can include but not limited to: dc detection circuit 303, AC detection circuit 306, DC-to-dc change-over circuit 304, dc-ac conversion circuit 305, power conversions control circuit 307 and ripple are eliminated unit 310.Ripple is eliminated unit 310 and is coupled with DC-to-dc change-over circuit 304.
In the present embodiment, dc detection circuit 303 can be connected with solar panels 301, is used to detect the dc signal of input; AC detection circuit 306 can be connected with AC network 302, is used to detect the ac signal of output; DC-to-dc change-over circuit 304 can be connected with dc detection circuit 303, is used for dc signal is boosted; Dc-ac conversion circuit 305 can be connected with AC detection circuit 306 with DC-to-dc change-over circuit 304 respectively, is used for converting direct current to alternating current; Power conversions control circuit 307 can be connected with dc detection circuit 303, AC detection circuit 306, DC-to-dc change-over circuit 304 and dc-ac conversion circuit 305 respectively; Be used for passing through reference current control switch (not shown), single-phase inverter 300 is produced and the synchronous output ACs of alternating voltage according to the direct voltage of input and the alternating voltage and the electric current of electric current and output; And ripple eliminates unit 310 and can be connected with dc detection circuit 303, AC detection circuit 306 and dc-ac conversion circuit 305 respectively, is used for the ripple according to ac signal elimination single-phase inverter 300 direct-flow input ends of the dc signal of input and output.
Wherein, the elimination of the ripple in present embodiment unit 310 can further be decomposed into and comprise ripple control device 311, energy storage unit 313 and energy storage controller 312.Wherein ripple control device 311 can be connected with AC detection circuit 306 with dc detection circuit 303 respectively, is used for controlling the mode of operation that ripple is eliminated unit 310 according to the dc signal of input and the ac signal of output: charge mode and discharge mode; Energy storage unit 313 can be connected with DC-to-dc change-over circuit 304, is used to store or discharge the energy of direct-flow input end; And energy storage controller 312 can be connected with energy storage unit 313 with ripple control device 311 respectively, is used for the instruction according to ripple control device 311, and the switch of control energy storage element 313 is carried out the storage and the release of energy.
Fig. 4 is the simple circuit structure sketch map of single-phase back exciting converter of the elimination direct-flow input end ripple of an embodiment of the utility model.As shown in the figure; In this single-phase back exciting converter 400; Energy storage unit 413 is for boosting-the reducing two-way transducer, and it can comprise secondary coil Tr, inductance L r, storage capacitor Cr, a MOS switching tube Qr1, the 2nd MOS switching tube Qr2, the first diode Dr1 (body diode that the first diode Dr1 also can a MOS switching tube Qr1) and the second diode Dr2 (the second diode Dr2 also can be exactly the body diode of the 2nd MOS switching tube Qr2) of transducer.
In the present embodiment, secondary coil Tr can be coupled with the main sideline circle of transducer; First end of inductance L r can be connected with first end of secondary coil Tr, and second end of inductance L r can be connected to first end of capacitor C r through the 2nd MOS switching tube Qr2; Second end of capacitor C r can be connected to second end of secondary coil Tr; The one MOS switching tube Qr1 is connected across between second end of second end and secondary coil Tr of inductance L r; The one MOS switching tube Qr1 and the 2nd MOS switching tube Qr2 through energy storage controller 412 its switches of control, carry out the storage and the release of energy respectively; The first diode Dr1 and the second diode Dr2 are connected in parallel on a MOS switching tube Qr1 and the 2nd MOS switching tube Qr2 two ends respectively; The positive pole of the first diode Dr1 is connected to second end of secondary coil Tr; The negative pole of the first diode Dr1 is connected to second end of inductance L r; The positive pole of the second diode Dr2 is connected to second end of inductance L r, and the negative pole of the second diode Dr2 is connected to first end of capacitor C r.
In single-phase back exciting converter 400 shown in Figure 4, when the 2nd MOS switching tube Qr2 keeps shut, this transducer is by the stepup transformer of transformer Tr to capacitor C r; When a MOS switching tube Qr1 keeps shut, this transducer is by the reducing transformer of capacitor C r to transformer Tr.
The storage capacitor Cr in the ripple elimination unit and the input of inverter 400 are isolated, and can reach higher voltage, thereby can use littler electric capacity for identical energy.
Do to introduce in detail further in the face of the operation principle of the single-phase inverter of the elimination direct-flow input end ripple of an embodiment of the utility model down.
For average output power Po and a-c cycle f, if ignore transition loss, input power is made up of the ripple of direct current component Pdc and double mains frequency.DC power supply only provides direct current component Po, so energy storage unit need provide double frequency part Po cos (2wt).Suppose that power output is p
o(t), work as p
o(t)＞during Po, energy storage unit releases energy to output; Work as p
o(t)＜during Po, energy storage unit stores the unnecessary energy of DC power supply.
Ripple is eliminated the charge mode of unit: p
o(t)＜and Po, energy storage unit stores the unnecessary energy Po-p of DC power supply
o(t).Fig. 5 is that the ripple in the single-phase back exciting converter of elimination direct-flow input end ripple of an embodiment of the utility model is eliminated the simple circuit structure sketch map of cell operation when charge mode.As shown in Figure 5, when the 2nd MOS switching tube Qr2 closes, energy storage unit be one by the coil of transformer Tr booster circuit to capacitor C r.When main switch Q conducting and a MOS switching tube Qr1 closed, the energy storage of DC power supply DC was to the former limit of main transformer, and the electric energy in the inductance L r is transferred to capacitor C r through the second diode Dr2 simultaneously.When main switch Q closes and during a MOS switching tube Qr1 conducting, the electric energy in the main transformer is transferred to simultaneously and exchanges output and the interior inductance L r of energy storage unit.The drive signal of a main switch Q and a MOS switching tube Qr1 is complementary, all is to be operated in high frequency, such as 100kHz～1MHz.Through booster circuit, the voltage on the capacitor C r is higher than the output of transformer Tr, and the ratio of boosting can recently be controlled through the duty of a MOS switching tube Qr1 switch.
Ripple is eliminated the discharge mode of unit: p
o(t)＞and Po, the electric energy of energy storage unit release stored replenishes and gives output p
o(t)-Po.Fig. 6 is that the ripple in the single-phase back exciting converter of elimination direct-flow input end ripple of an embodiment of the utility model is eliminated the simple circuit structure sketch map of cell operation when discharge mode.As shown in Figure 6, when a MOS switching tube Qr1 closes, energy storage unit is the reduction voltage circuit of capacitor C r to transformer Tr.When main switch Q closes and during the 2nd MOS switching tube Qr2 conducting, the energy Pr in the capacitor C r is transferred to inductance L r, the power transfer in the transformer is given output simultaneously.When main switch Q conducting and the 2nd MOS switching tube Qr2 closed, the energy Pr among the inductance L r was transferred to transformer Tr through the first diode Dr1.The drive signal of a main switch Q and a MOS switching tube Qr1 is complementary, all is to be operated in high frequency, such as 100kHz～1MHz.Through reduction voltage circuit, the voltage on the capacitor C r is higher than the output of transformer Tr, and the ratio of step-down can recently be controlled through the duty of the 2nd MOS switching tube Qr2 switch.
Fig. 7 is the rough schematic of a series of activities waveform of single-phase inverter of the elimination direct-flow input end ripple of an embodiment of the utility model.As shown in the figure, be followed successively by from top to bottom: the drive signal of the drive signal of the output voltage of single-phase inverter and current waveform, power waveform, the first switching tube Qr1, second switch pipe Qr2 and the drive signal of main switch Q.Wherein the control of the switch of main switch Q, the first switching tube Qr1 and second switch pipe Qr2 is as above described.
In the present embodiment, the mode of the mode of operation of control energy storage element has following three kinds at least:
A kind of is more instant power output p
o(t) with average output power Po.AC detection circuit detects output voltage and electric current, calculates instant power output p
o(t) and average output power Po.Compare power output p
o(t) and average output power Po come the Control work pattern.Work as p
o(t)＞during Po, be discharge mode; Work as p
o(t)＜during Po, be charge mode.
A kind of is more instant input power p
In(t) with Mean Input Power Pdc.Dc detection circuit detects input voltage and electric current, calculates instant input power p
In(t) and Mean Input Power Pdc.Compare input power p
In(t) and Mean Input Power Pdc come the Control work pattern.Work as P
In(t)＞during Pdc, be discharge mode.Work as P
In(t)＜during Pdc, be charge mode.
Another kind of for using the alternating current zero crossing point control.AC detection circuit detects voltage over zero, is made as 0 phase place, then+and π/4 phase points are the transition point that ripple is eliminated pattern.If by just bearing, ripple control is transformed to discharge mode by charge mode at zero crossing voltage.If at zero crossing voltage by just to negative, ripple control is transformed to charge mode by discharge mode.
The single-phase inverter of the utility model has increased ripple and has eliminated the unit, through detecting ripple power, the mode of operation of change-over circuit in the control energy storage element.When the input direct current power is higher than power output, be charge mode, the energy storage unit storage power.When the input direct current power is lower than power output, be discharge mode, energy storage unit releases energy and replenishes to output.Eliminate the switch of unit internal conversion circuit through the control ripple; Voltage on the electric capacity changes with energy waveform; Voltage on it and energy stored decision capacitance; The energy of electric capacity can be controlled as and be equal to double frequency ripple power, realizes discharging and recharging, thus the double frequency ripple of elimination single-phase inverter DC side input.
Though the utility model with preferred embodiment openly as above, it is not to be used for limiting the utility model, and any those skilled in the art can make possible change and modification in spirit that does not break away from the utility model and scope.Therefore, every content that does not break away from the utility model technical scheme, all falls within the protection range that the utility model claim defined any modification, equivalent variations and modification that above embodiment did according to the technical spirit of the utility model.
Claims (12)
1. a single-phase inverter of eliminating the direct-flow input end ripple is connected between direct current input and the interchange output, it is characterized in that, comprising:
Dc detection circuit is connected with said direct current input, detects the dc signal of input;
AC detection circuit exchanges output and is connected with said, detects the ac signal of output;
The DC-to-dc change-over circuit is connected with said dc detection circuit, and said dc signal is boosted;
Dc-ac conversion circuit is connected with AC detection circuit with the DC-to-dc change-over circuit respectively, converts said direct current to said alternating current;
The power conversions control circuit; Be connected with said dc-ac conversion circuit with said dc detection circuit, said AC detection circuit, said DC-to-dc change-over circuit respectively; Pass through the reference current control switch according to the direct voltage of input and the alternating voltage and the electric current of electric current and output, said single-phase inverter is produced and the synchronous output AC of said alternating voltage; And
Ripple is eliminated the unit, is connected with said dc detection circuit, said AC detection circuit and said dc-ac conversion circuit respectively, eliminates the ripple of said single-phase inverter direct-flow input end according to the ac signal of dc signal of importing and output;
Wherein, said ripple is eliminated the unit and is comprised:
The ripple control device is connected with said AC detection circuit with said dc detection circuit respectively, controls the mode of operation that said ripple is eliminated the unit according to the dc signal of input and the ac signal of output;
Energy storage unit is connected with said DC-to-dc change-over circuit, stores or discharge the energy of said direct-flow input end; And
The energy storage controller is connected with said energy storage unit with said ripple control device respectively, according to the instruction of said ripple control device, controls the switch of said energy storage unit, carries out the storage and the release of said energy.
2. single-phase inverter according to claim 1 is characterized in that, said energy storage unit is for boosting-the reducing two-way transducer.
3. single-phase inverter according to claim 2 is characterized in that, said energy storage unit comprises secondary coil, inductance, electric capacity, first switching tube, second switch pipe, first diode and second diode of said transducer, wherein:
The main sideline circle of said secondary coil and said transducer is coupled;
First end of said inductance is connected with first end of said secondary coil, and second end of said inductance is connected to first end of said electric capacity through said second switch pipe;
Second end of said electric capacity is connected to second end of said secondary coil;
Said first switching tube is connected across between second end of second end and said secondary coil of said inductance;
Said first switching tube and said second switch pipe through said its switch of energy storage controller control, are carried out the storage and the release of said energy respectively;
Said first diode and said second diode are connected in parallel on said first switching tube and said second switch pipe two ends respectively; The positive pole of said first diode is connected to second end of said secondary coil; The negative pole of said first diode is connected to second end of said inductance; The positive pole of said second diode is connected to second end of said inductance, and the negative pole of said second diode is connected to first end of said electric capacity.
4. according to each described single-phase inverter in the claim 1 to 3, it is characterized in that the mode of operation that said ripple is eliminated the unit comprises: charge mode and discharge mode.
5. according to each described single-phase inverter in the claim 1 to 3, it is characterized in that said ripple control device, said energy storage controller and said power conversions controller are integrated in the same circuit.
6. single-phase inverter according to claim 5 is characterized in that, said ripple control device, said energy storage controller and said power conversions controller are realized with FPGA, CPU, MCU, DSP or ASIC.
7. a solar photovoltaic generation system comprises one or more single-phase inverter, and said single-phase inverter is connected between solar panels and the electrical network, it is characterized in that, said single-phase inverter comprises:
Dc detection circuit is connected with said solar panels, detects the dc signal of input;
AC detection circuit is connected with said electrical network, detects the ac signal of output;
The DC-to-dc change-over circuit is connected with said dc detection circuit, and said dc signal is boosted;
Dc-ac conversion circuit is connected with AC detection circuit with the DC-to-dc change-over circuit respectively, converts said direct current to said alternating current;
The power conversions control circuit; Be connected with said dc-ac conversion circuit with said dc detection circuit, said AC detection circuit, said DC-to-dc change-over circuit respectively; Pass through the reference current control switch according to the direct voltage of input and the alternating voltage and the electric current of electric current and output, said single-phase inverter is produced and the synchronous output AC of said alternating voltage; And
Ripple is eliminated the unit, is connected with said dc detection circuit, said AC detection circuit and said dc-ac conversion circuit respectively, eliminates the ripple of said single-phase inverter direct-flow input end according to the ac signal of dc signal of importing and output;
Wherein, said ripple is eliminated the unit and is comprised:
The ripple control device is connected with said AC detection circuit with said dc detection circuit respectively, controls the mode of operation that said ripple is eliminated the unit according to the dc signal of input and the ac signal of output;
Energy storage unit is connected with said DC-to-dc change-over circuit, stores or discharge the energy of said direct-flow input end; And
The energy storage controller is connected with said energy storage unit with said ripple control device respectively, according to the instruction of said ripple control device, controls the switch of said energy storage unit, carries out the storage and the release of said energy.
8. solar photovoltaic generation system according to claim 7 is characterized in that, said energy storage unit is for boosting-the reducing two-way transducer.
9. solar photovoltaic generation system according to claim 8 is characterized in that, said energy storage unit comprises secondary coil, inductance, electric capacity, first switching tube, second switch pipe, first diode and second diode of said transducer, wherein:
The main sideline circle of said secondary coil and said transducer is coupled;
First end of said inductance is connected with first end of said secondary coil, and second end of said inductance is connected to first end of said electric capacity through said second switch pipe;
Second end of said electric capacity is connected to second end of said secondary coil;
Said first switching tube is connected across between second end of second end and said secondary coil of said inductance;
Said first switching tube and said second switch pipe through said its switch of energy storage controller control, are carried out the storage and the release of said energy respectively;
Said first diode and said second diode are connected in parallel on said first switching tube and said second switch pipe two ends respectively; The positive pole of said first diode is connected to second end of said secondary coil; The negative pole of said first diode is connected to second end of said inductance; The positive pole of said second diode is connected to second end of said inductance, and the negative pole of said second diode is connected to first end of said electric capacity.
10. according to each described solar photovoltaic generation system in the claim 7 to 9, it is characterized in that the mode of operation that said ripple is eliminated the unit comprises: charge mode and discharge mode.
11., it is characterized in that said ripple control device, said energy storage controller and said power conversions controller are integrated in the same circuit according to each described solar photovoltaic generation system in the claim 7 to 9.
12. solar photovoltaic generation system according to claim 11 is characterized in that, said ripple control device, said energy storage controller and said power conversions controller are realized with FPGA, CPU, MCU, DSP or ASIC.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120234883 CN202121514U (en) | 2011-07-05 | 2011-07-05 | Single-phase inverter capable of eliminating direct current input terminal ripple and solar photovoltaic power generation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120234883 CN202121514U (en) | 2011-07-05 | 2011-07-05 | Single-phase inverter capable of eliminating direct current input terminal ripple and solar photovoltaic power generation system |
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| Publication Number | Publication Date |
|---|---|
| CN202121514U true CN202121514U (en) | 2012-01-18 |
Family
ID=45462550
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201120234883 Withdrawn - After Issue CN202121514U (en) | 2011-07-05 | 2011-07-05 | Single-phase inverter capable of eliminating direct current input terminal ripple and solar photovoltaic power generation system |
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| CN (1) | CN202121514U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102255482A (en) * | 2011-07-05 | 2011-11-23 | 浙江昱能光伏科技集成有限公司 | Single-phase inverter for eliminating ripples wave at direct current input end and solar photovoltaic generating system |
| CN104242701A (en) * | 2013-06-13 | 2014-12-24 | 台达电子工业股份有限公司 | Converter for converting direct currents into alternating currents, micro-inverter and solar system of micro-inverter |
| WO2017107401A1 (en) * | 2015-12-23 | 2017-06-29 | 厦门科华恒盛股份有限公司 | Direct-current bus voltage ripple compensation method and photovoltaic inverter |
| TWI664800B (en) * | 2018-03-07 | 2019-07-01 | 國立成功大學 | Boost-type dc power converter and method for voltage ripple inhibition of pv module |
-
2011
- 2011-07-05 CN CN 201120234883 patent/CN202121514U/en not_active Withdrawn - After Issue
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102255482A (en) * | 2011-07-05 | 2011-11-23 | 浙江昱能光伏科技集成有限公司 | Single-phase inverter for eliminating ripples wave at direct current input end and solar photovoltaic generating system |
| CN102255482B (en) * | 2011-07-05 | 2013-06-19 | 浙江昱能光伏科技集成有限公司 | Single-phase inverter for eliminating ripples wave at direct current input end and solar photovoltaic generating system |
| CN104242701A (en) * | 2013-06-13 | 2014-12-24 | 台达电子工业股份有限公司 | Converter for converting direct currents into alternating currents, micro-inverter and solar system of micro-inverter |
| CN104242701B (en) * | 2013-06-13 | 2017-06-16 | 台达电子工业股份有限公司 | Switcher for changing DC into AC, micro- inverter and its solar energy system |
| WO2017107401A1 (en) * | 2015-12-23 | 2017-06-29 | 厦门科华恒盛股份有限公司 | Direct-current bus voltage ripple compensation method and photovoltaic inverter |
| TWI664800B (en) * | 2018-03-07 | 2019-07-01 | 國立成功大學 | Boost-type dc power converter and method for voltage ripple inhibition of pv module |
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| AV01 | Patent right actively abandoned |
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