CN103414364A - Single-phase grid-connection inverter - Google Patents
Single-phase grid-connection inverter Download PDFInfo
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- CN103414364A CN103414364A CN2013103937223A CN201310393722A CN103414364A CN 103414364 A CN103414364 A CN 103414364A CN 2013103937223 A CN2013103937223 A CN 2013103937223A CN 201310393722 A CN201310393722 A CN 201310393722A CN 103414364 A CN103414364 A CN 103414364A
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Abstract
The invention discloses a single-phase grid-connection inverter. The single-phase grid-connection inverter comprises an input voltage-dividing capacitance module, a leak current suppression circuit, a single-phase five-level main topologic module with a power-frequency bridge arm and an output filtering module, wherein the input voltage-dividing capacitance module is connected with an input direct-current source; the single-phase five-level main topologic module with the power-frequency bridge arm is respectively connected with the input voltage-dividing capacitance module, the input direct-current source, the leak current suppression circuit and the output filtering module; the leak current suppression circuit is respectively connected with the input direct-current source, the single-phase five-level main topologic module with the power-frequency bridge arm and the output filtering module. According to the single-phase grid-connection inverter disclosed by the invention, the voltage of a PV battery panel ground parasitic capacitance at an input side of the single-phase grid-connection inverter can be in constant slope transition between zero volt and the whole busbar voltage, thus the approximate constant slope slow change of the voltage on the PV battery panel ground parasitic capacitance is ensured, the current flowing through the PV battery panel ground parasitic capacitance can be reduced, and the purpose of suppressing leak current can be realized.
Description
Technical field
The present invention relates to the inverter technology field, more particularly, relate to a kind of single-phase grid-connected inverter.
Background technology
At present, between the photovoltaic generation industry is due to PV cell panel and the earth, there is larger parasitic capacitance, cause traditional some topologys such as unipolarity modulation H4 to have leakage problem, although can solve leakage problem with the isolated form topology of transformer, brought the loss of efficiency.Efficient for pursuing, solve simultaneously leakage problem, the topology of the non-isolation such as H5, H6, HERIC occurs, but be mostly tri-level circuit, efficiency is not still very high.For further raising the efficiency and reducing costs, people start to pay close attention to five level topologys, a kind of single-phase five-electrical level inverter with the power frequency brachium pontis that CN102843054A proposes, simple in structure, efficiency is high, still, its power frequency switching moment, the PV cell panel is voltage instantaneous abrupt change between zero volt and whole busbar voltage of parasitic capacitance over the ground, flow through very large peak current, cause inverter leakage current excessive, limited its application at photovoltaic industry.
Summary of the invention
In view of this, the invention provides a kind of single-phase grid-connected inverter, can solve the leakage problem of inverter when power frequency is switched.
For solving the problems of the technologies described above, the technical solution used in the present invention is:
A kind of single-phase grid-connected inverter comprises: input dividing potential drop capacitance module, drain current suppressing circuit, with single-phase five level master topography modules and the output filtering module of power frequency brachium pontis; Wherein:
Described input dividing potential drop capacitance module is connected with the input direct-current source;
Described single-phase five level master topography modules with the power frequency brachium pontis are connected with described input dividing potential drop capacitance module, described input direct-current source, described drain current suppressing circuit and described output filtering module respectively;
Described drain current suppressing circuit is connected with described output filtering module with described input direct-current source, described single-phase five level master topography modules with the power frequency brachium pontis respectively.
Preferably, described input dividing potential drop capacitance module comprises: the first dividing potential drop electric capacity and the second dividing potential drop electric capacity; Wherein:
Described the first dividing potential drop electric capacity is connected with described the second dividing potential drop electric capacity with described input direct-current source respectively;
Described the second dividing potential drop electric capacity is connected with described input direct-current source;
Described the first dividing potential drop electric capacity is connected with described single-phase five level master topography modules with the power frequency brachium pontis with the series connection mid point of described the second dividing potential drop electric capacity.
Preferably, described single-phase five level master topography modules with the power frequency brachium pontis comprise: the first power switch pipe, the second power switch pipe, the 3rd power switch pipe, the 4th power switch pipe, the 5th power switch pipe, the 6th power switch pipe, the 7th power switch pipe, the 8th power switch pipe, the first power diode and the second power diode; Wherein:
Described the first power switch pipe one end is connected with the series connection mid point of the second dividing potential drop electric capacity with described the first dividing potential drop electric capacity, and the other end is connected with the series connection mid point of the 4th power switch pipe with described the 3rd power switch pipe;
Described the second power switch pipe one end is connected with the series connection mid point of the second dividing potential drop electric capacity with described the first dividing potential drop electric capacity, and the other end is connected with the series connection mid point of described the 6th power switch pipe with described the 5th power switch pipe;
One end of described the 3rd power switch pipe is connected with described input direct-current source, and the other end is connected with described the 4th power switch pipe with described the first power switch pipe;
One end of described the 4th power switch pipe is connected with described the 3rd power switch pipe with described the first power switch pipe respectively, and the other end is connected with described output filtering module;
One end of described the 6th power switch pipe is connected with described input direct-current source, and the other end is connected with described the 5th power switch pipe with described the second power switch pipe;
One end of described the 5th power switch pipe is connected with described the 6th power switch pipe with described the second power switch pipe, and the other end is connected with described output filtering module;
One end of described the first power diode is connected with described the 5th power switch pipe, and the other end is connected with described input direct-current source;
One end of described the second power diode is connected with described input direct-current source, and the other end is connected with described the 4th power switch pipe;
One end of described the 7th power switch pipe is connected with described input direct-current source, and the other end is connected with an end of described the 8th power switch pipe;
The other end of described the 8th power switch pipe is connected with described input direct-current source;
The series connection mid point of described the 7th power switch pipe and described the 8th power switch pipe is connected with described output filtering module.
Preferably, described single-phase five level master topography modules with the power frequency brachium pontis comprise: the first power diode, the second power diode, the 3rd power diode, the 4th power diode, the 3rd power switch pipe, the 4th power switch pipe, the 5th power switch pipe, the 6th power switch pipe, the 7th power switch pipe and the 8th power switch pipe; Wherein:
Described the 3rd power diode one end is connected with the series connection mid point of the second dividing potential drop electric capacity with described the first dividing potential drop electric capacity, and the other end is connected with the series connection mid point of the 4th power switch pipe with described the 3rd power switch pipe;
Described the 4th power diode one end is connected with the series connection mid point of the second dividing potential drop electric capacity with described the first dividing potential drop electric capacity, and the other end is connected with the series connection mid point of described the 6th power switch pipe with described the 5th power switch pipe;
One end of described the 3rd power switch pipe is connected with described input direct-current source, and the other end is connected with described the 4th power switch pipe with described the 3rd power diode respectively;
One end of described the 4th power switch pipe is connected with described the 3rd power switch pipe with described the 3rd power diode respectively, and the other end is connected with described output filtering module;
One end of described the 6th power switch pipe is connected with described input direct-current source, and the other end is connected with described the 5th power switch pipe with described the 4th power diode;
One end of described the 5th power switch pipe is connected with described the 6th power switch pipe with described the 4th power diode, and the other end is connected with described output filtering module;
One end of described the first power diode is connected with described the 5th power switch pipe, and the other end is connected with described input direct-current source;
One end of described the second power diode is connected with described input direct-current source, and the other end is connected with described the 4th power switch pipe;
One end of described the 7th power switch pipe is connected with described input direct-current source, and the other end is connected with an end of described the 8th power switch pipe;
The other end of described the 8th power switch pipe is connected with described input direct-current source;
The series connection mid point of described the 7th power switch pipe and described the 8th power switch pipe is connected with described output filtering module.
Preferably, described drain current suppressing circuit comprises: the 9th power switch pipe, the tenth power switch pipe, the first buffer resistance, the second buffer resistance, the first filter capacitor, the second filter capacitor and the first filter inductance; Wherein:
One end of described the 9th power switch pipe is connected with described input direct-current source, and the other end is connected with described the tenth power switch pipe;
Described the tenth power switch pipe one end is connected with described the 9th power switch pipe, and the other end is connected with described input direct-current source;
One end of described the first buffer resistance is connected with described input direct-current source, and the other end is connected with described the first filter capacitor;
Described the first filter capacitor one end is connected with described the first buffer resistance, and the other end is connected with described the second buffer resistance;
Described the second buffer resistance one end is connected with described the first filter capacitor, and the other end is connected with described the second filter capacitor;
Described the second filter capacitor one end is connected with described the second buffer resistance, and the other end is connected with described input direct-current source;
One end of described the first filter inductance is connected with the series connection mid point of described the tenth power switch pipe with described the 9th power switch pipe, and the other end is connected with described output filtering module with the series connection mid point of described the 8th power switch pipe with the series connection mid point of the second buffer resistance, described the 7th power switch pipe with described the first filter capacitor respectively.
Preferably, described output filtering module comprises: the second filter inductance, the 3rd filter inductance and the 3rd filter capacitor; Wherein:
One end of described the second filter inductance is connected with described the 4th power switch pipe with described the second power diode, and the other end is connected with an end of described the 3rd filter capacitor;
One end of described the 3rd filter inductance is connected with described the 5th power switch pipe with described the first power diode, and the other end is connected with an end of described the 3rd filter capacitor;
The other end of described the 3rd filter capacitor is connected with the series connection mid point of the tenth power switch pipe with described the 9th power switch pipe.
Preferably, described output filtering module comprises: the second filter inductance, the 3rd filter inductance, the 4th filter inductance and the 3rd filter capacitor; Wherein:
One end of described the second filter inductance is connected with described the 4th power switch pipe with described the second power diode, and the other end is connected with an end of described the 4th filter inductance;
One end of described the 3rd filter inductance is connected with described the 5th power switch pipe with described the first power diode, and the other end is connected with an end of described the 4th filter inductance;
The other end of described the 4th filter inductance is connected with an end of described the 3rd filter capacitor;
The other end of described the 3rd filter capacitor is connected with the series connection mid point of the tenth power switch pipe with described the 9th power switch pipe.
Preferably, described single-phase grid-connected inverter comprises 12 operation modes, is respectively:
The first operation mode, described the 3rd power switch pipe, the 4th power switch pipe and the 7th power switch pipe conducting, all the other power switch pipes, the first power diode and the second power diode all end;
The second operation mode, described the first power switch pipe, the 4th power switch pipe and the 7th power switch pipe conducting, all the other power switch pipes, the first power diode and the second power diode all end;
The 3rd operation mode, described the 7th power switch pipe and the second power diode conducting, all the other power switch pipes and the first power diode all end;
The 4th operation mode, described the 8th power switch pipe and the first power diode conducting, all the other power switch pipes and the second power diode all end;
The 5th operation mode, described the 8th power switch pipe, the 5th power switch pipe and the second power switch pipe conducting, all the other power switch pipes, the first power diode and the second power diode all end;
The 6th operation mode, described the 8th power switch pipe, the 5th power switch pipe and the 6th power switch pipe conducting, all the other power switch pipes, the first power diode and the second power diode all end;
The 7th operation mode, described the 3rd power switch pipe, the first power diode, the 4th power switch pipe and the tenth power switch pipe conducting, all the other power switch pipes and the second power diode all end;
The 8th operation mode, described the 3rd power switch pipe, the first power diode, the 4th power switch pipe and the 9th power switch pipe conducting, all the other power switch pipes and the second power diode all end;
The 9th operation mode, described the first power switch pipe, the second power switch pipe, the 4th power switch pipe, the 5th power switch pipe and the 9th power switch pipe conducting, all the other power switch pipes, the first power diode and the second power diode all end;
The tenth operation mode, described the first power switch pipe, the second power switch pipe, the 4th power switch pipe, the 5th power switch pipe and the tenth power switch pipe conducting, all the other power switch pipes, the first power diode and the second power diode all end;
The 11 operation mode, described the 5th power switch pipe, the second power diode, the 6th power switch pipe and the tenth power switch pipe conducting, all the other power switch pipes and the first power diode all end;
The 12 operation mode, described the 5th power switch pipe, the second power diode, the 6th power switch pipe, the 9th power switch pipe conducting, all the other power switch pipes and the first power diode all end.
From above-mentioned technical scheme, can find out, a kind of single-phase grid-connected inverter disclosed by the invention, by drain current suppressing circuit is combined with the single-phase five level master topography modules with the power frequency brachium pontis, can by the PV cell panel of inverter input side over the ground the voltage of parasitic capacitance between zero volt and whole busbar voltage, carry out permanent slope transition, thereby can guarantee the PV cell panel over the ground the approximate permanent slope of the voltage on parasitic capacitance slowly change, reduce to flow through the PV cell panel electric current of parasitic capacitance over the ground, realized suppressing the purpose of leakage current.
The accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, below will the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the structural representation of a kind of single-phase grid-connected inverter disclosed by the invention;
Fig. 2 is the circuit diagram of a kind of single-phase grid-connected inverter disclosed by the invention;
Fig. 3 is the modulating wave schematic diagram of main circuit topology disclosed by the invention;
Fig. 4 is single-phase grid-connected inverter disclosed by the invention corresponding circuit diagram while being in the first operation mode;
Fig. 5 is single-phase grid-connected inverter disclosed by the invention corresponding circuit diagram while being in the second operation mode;
Fig. 6 is single-phase grid-connected inverter disclosed by the invention corresponding circuit diagram while being in the 3rd operation mode;
Fig. 7 is single-phase grid-connected inverter disclosed by the invention corresponding circuit diagram while being in the 4th operation mode;
Fig. 8 is single-phase grid-connected inverter disclosed by the invention corresponding circuit diagram while being in the 5th operation mode;
Fig. 9 is single-phase grid-connected inverter disclosed by the invention corresponding circuit diagram while being in the 6th operation mode;
Figure 10 is single-phase grid-connected inverter disclosed by the invention corresponding circuit diagram while being in the 7th operation mode;
Figure 11 is single-phase grid-connected inverter disclosed by the invention corresponding circuit diagram while being in the 8th operation mode;
Figure 12 is single-phase grid-connected inverter disclosed by the invention corresponding circuit diagram while being in the 9th operation mode;
Figure 13 is single-phase grid-connected inverter disclosed by the invention corresponding circuit diagram while being in the tenth operation mode;
Figure 14 is single-phase grid-connected inverter disclosed by the invention corresponding circuit diagram while being in 11 operation mode;
Figure 15 is single-phase grid-connected inverter disclosed by the invention corresponding circuit diagram while being in 12 operation mode;
Figure 16 is the circuit diagram of another kind of single-phase grid-connected inverter disclosed by the invention;
Figure 17 is the circuit diagram of another kind of single-phase grid-connected inverter disclosed by the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only a part of embodiment of the present invention, rather than whole embodiment.Based on the embodiment in the present invention, those of ordinary skills, not making under the creative work prerequisite the every other embodiment obtained, belong to the scope of protection of the invention.
The embodiment of the invention discloses a kind of single-phase grid-connected inverter, can solve the leakage problem of inverter when power frequency is switched.
As shown in Figure 1, be a kind of single-phase grid-connected inverter disclosed by the invention, comprise: input dividing potential drop capacitance module 11, drain current suppressing circuit 12, with single-phase five level master topography module 13 and the output filtering modules 14 of power frequency brachium pontis; Wherein:
Input dividing potential drop capacitance module 11 is connected with input direct-current source 15;
Single-phase five level master topography modules 13 with the power frequency brachium pontis are connected with output filtering module 14 with input dividing potential drop capacitance module 11, input direct-current source 15, drain current suppressing circuit 12 respectively;
Drain current suppressing circuit 12 is respectively with input direct-current source 15, be connected with output filtering module 14 with the single-phase five level master topography modules 13 of power frequency brachium pontis.
In the above-described embodiments, by drain current suppressing circuit 12 is combined with the single-phase five level master topography modules 13 with the power frequency brachium pontis, can by the PV cell panel of inverter input side over the ground the voltage of parasitic capacitance between zero volt and whole busbar voltage, carry out permanent slope transition, thereby can guarantee the PV cell panel over the ground the approximate permanent slope of the voltage on parasitic capacitance slowly change, reduce to flow through the PV cell panel electric current of parasitic capacitance over the ground, realized suppressing the purpose of leakage current.
As shown in Figure 2, be the circuit diagram of a kind of single-phase grid-connected inverter disclosed by the invention, wherein: the first dividing potential drop capacitor C 1 and the second dividing potential drop capacitor C 2 form the dividing potential drop capacitance module; The first power switch pipe Q1, the second power switch pipe Q2, the 3rd power switch pipe QH1, the 4th power switch pipe QH2, the 5th power switch pipe QH3, the 6th power switch pipe QH4, the 7th power switch pipe QL1, the 8th power switch pipe QL2, the first power diode D3 and the second power diode D4 form the single-phase five level master topography modules with the power frequency brachium pontis; The 9th power switch pipe QS1, the tenth power switch pipe QS2, the first buffer resistance RS1, the second buffer resistance RS2, the first filter capacitor CS1, the second filter capacitor CS2 and the first filter inductance LS form drain current suppressing circuit; The second filter inductance L1, the 3rd filter inductance L2 and the 3rd filter capacitor C0 form filtration module; Wherein:
One end of the first dividing potential drop capacitor C 1 is connected with input direct-current source DC, and the other end is connected with the second dividing potential drop capacitor C 2; One end of the second dividing potential drop capacitor C 2 is connected with input direct-current source DC, the other end and the first dividing potential drop capacitor C 1 electric capacity;
The first power switch pipe Q1 mono-end is connected with the series connection mid point of the second dividing potential drop capacitor C 2 with the first dividing potential drop capacitor C 1, and the other end is connected with the 4th power switch pipe QH2 with the 3rd power switch pipe QH1;
The second power switch pipe Q2 mono-end is connected with the series connection mid point of the second dividing potential drop capacitor C 2 with the first dividing potential drop capacitor C 1, and the other end is connected with the 6th power switch pipe QH4 with the 5th power switch pipe QH3;
The end of the 3rd power switch pipe QH1 is connected with input direct-current source DC, and the other end is connected with the 4th power switch pipe QH2 with the first power switch pipe Q1;
The end of the 6th power switch pipe QH4 is connected with input direct-current source DC, and the other end is connected with the 5th power switch pipe QH3 with the second power switch pipe Q2;
The anode of the first power diode D3 is connected with the 5th power switch pipe QH3, and negative electrode is connected with input direct-current source DC;
The anode of the second power diode D4 is connected with input direct-current source DC, and negative electrode is connected with the 4th power switch pipe QH2;
The end of the 9th power switch pipe QS1 is connected with input direct-current source DC, and the other end is connected with the tenth power switch pipe QS2;
The end of the tenth power switch pipe QS2 is connected with input direct-current source DC, and the other end is connected with the 9th power switch pipe QS1;
The end of the first buffer resistance RS1 is connected with input direct-current source DC, and the other end is connected with the first filter capacitor CS1;
The end of the first filter capacitor CS1 is connected with the first buffer resistance RS1, and the other end is connected with the second buffer resistance RS2;
The end of the second buffer resistance RS2 is connected with the first filter capacitor CS1, and the other end is connected with the second filter capacitor CS2;
The end second buffer resistance RS2 of the second filter capacitor CS2 connects, and the other end is connected with input direct-current source DC;
The end of the first filter inductance LS is connected with the series connection mid point of the tenth power switch pipe QS2 with the 9th power switch pipe QS1, and the other end is connected with the series connection mid point of the 8th power switch pipe QL2 with the 7th power switch pipe QL1 with the series connection mid point of the second buffer resistance RS2 with the first filter capacitor CS1;
The end of the 8th power switch pipe QL2 is connected with input direct-current source DC, and the other end is connected with the end of the 7th power switch pipe QL1;
The end of the 7th power switch pipe QL1 is connected with the 8th power switch pipe QL2, and the other end is connected with input direct-current source DC;
The end of the second filter inductance L1 is connected with the 4th power switch pipe QH2 with the negative electrode of the second power diode D4, and the other end is connected with the end of the 3rd filter capacitor C0;
The end of the 3rd filter inductance L2 is connected with the 5th power switch pipe QH3 with the anode of the first power diode D3, the other end with the end of the 3rd filter capacitor C0 be connected;
The other end of the 3rd filter capacitor C0 is connected with the series connection mid point of the tenth power switch pipe QL2 with the 9th power switch pipe QL1.
As shown in Figure 3, be the modulating wave schematic diagram of main circuit topology of the present invention.In a power frequency period, the 9th power switch pipe QS1 of drain current suppressing circuit and the modulating wave of the tenth power switch pipe QS2 are in figure shown in curve a, only at time t0-t1, t2-t4, t5-t6 worked in these three periods, be equivalent to the buck circuit, duty ratio constant speed between 0 and 1 changes, by the PV cell panel over the ground the voltage of parasitic capacitance between zero volt and whole busbar voltage, carry out permanent slope transition.The 3rd power switch pipe QH1, the 4th power switch pipe QH2, the 5th power switch pipe QH3, and the modulating wave of the 6th power switch pipe QH4 is sectional curve: at time t1-t2 and time t4-t5 two ends in the time, the inversion modulating wave is by the curve b generation that takes absolute value; At time t0-t1, t2-t4, t5-t6 are in this three periods, and inversion modulating wave curve c is synthetic by the instantaneous value addition of curve a and curve b., positive-negative half-cycle is respectively exported 0,1,2 three level for this modulating wave and two groups of carrier wave ratios.The 7th power switch pipe QL1 and the 8th power switch pipe QL2 only work in two periods at time t1-t2 and time t4-t5, and in the t1-t2 time, the 7th power switch pipe QL1 opens, and the 8th power switch pipe QL2 closes; In the t4-t5 time, the 7th power switch pipe QL1 closes, and the 8th power switch pipe QL2 opens.
Drain current suppressing circuit is carried out permanent slope transition by the voltage between B point and O point between zero volt and whole busbar voltage, and the voltage between B point and O point is exactly the PV voltage of parasitic capacitance over the ground, thereby guarantee PV over the ground the approximate permanent slope of voltage on parasitic capacitance slowly change, reduce to flow through the electric current of this PV parasitic capacitance, reach the purpose that suppresses leakage current (the PV electric current on parasitic capacitance over the ground is the chief component of leakage current).
Time t0-t1, t2-t4, t5-t6 is defined as the transitional period in these three periods, drain current suppressing circuit is only worked within the transitional period, the transitional period need to comprise the zero crossing of curve b, and the transitional period duration is variable, according to leakage current, regulate, leakage current is larger, and the transitional period duration is longer.
Above-mentioned inverter has 12 kinds of operation modes:
As shown in Figure 4, corresponding circuit diagram when in Fig. 2, single-phase grid-connected inverter is in the first operation mode.The 3rd power switch pipe QH1, the 4th power switch pipe QH2 and the 7th power switch pipe QL1 conducting, the 3rd power switch pipe QH1, the 4th power switch pipe QH2, the second filter inductance L1, the 3rd filter capacitor C0 and the 7th power switch pipe QL1 form circuit loop; Due to the 3rd power switch pipe QL1 conducting, now the current potential of inlet highway negative pole equates with the electrical network zero line, and the PV cell panel voltage at parasitic capacitance two ends over the ground is zero.
As shown in Figure 5, corresponding circuit diagram when in Fig. 2, single-phase grid-connected inverter is in the second operation mode.The first power switch pipe Q1, the 4th power switch pipe QH2 and the 7th power switch pipe QL1 conducting, the second dividing potential drop capacitor C 2, the first power switch pipe Q1, the 4th power switch pipe QH2, the second filter inductance L1, the 3rd filter capacitor C0 and the 7th power switch pipe QL1 form circuit loop; Now, the 3rd still conducting of power switch pipe QL1, so the current potential of bus negative pole equates with the electrical network zero line.
Corresponding circuit diagram while as shown in Figure 6, being in the 3rd operation mode for single-phase grid-connected inverter in Fig. 2.The 7th power switch pipe QL1 conducting, the second power diode D4, the second filter inductance L1, the 3rd filter capacitor C0 and the 7th power switch pipe QL1 form circuit loop; Now, the current potential of bus negative pole still equates with the electrical network zero line.
Corresponding circuit diagram while as shown in Figure 7, being in the 4th operation mode for single-phase grid-connected inverter in Fig. 2.The 8th power switch pipe conducting QL2, the first power diode D3, the 8th power switch pipe QL2, the 3rd filter inductance L2 and the 3rd filter capacitor C0 form circuit loop; Now, the current potential of bus positive pole still equates with the electrical network zero line, and the PV cell panel voltage at parasitic capacitance two ends over the ground equals busbar voltage.
Corresponding circuit diagram while as shown in Figure 8, being in the 5th operation mode for single-phase grid-connected inverter in Fig. 2.The 8th power switch pipe QL2, the 5th power switch pipe QH3 and the second power switch pipe Q2 conducting, the first dividing potential drop capacitor C 1, the 8th power switch pipe QL2, the 3rd filter capacitor C0, the 3rd filter inductance L2, the 5th power switch pipe QH3 and Q2 the second power switch pipe form circuit loop; Now, the current potential of bus positive pole still equates with the electrical network zero line.
Corresponding circuit diagram while as shown in Figure 9, being in the 6th operation mode for single-phase grid-connected inverter in Fig. 2.The 8th power switch pipe QL2, the 5th power switch pipe QH3 and the 6th power switch pipe QH4 conducting, the first dividing potential drop capacitor C 1, the 8th power switch pipe QL2, the 3rd filter capacitor C0, the 3rd filter inductance L2, the 5th power switch pipe QH3, the 6th power switch pipe QH4 and the second dividing potential drop capacitor C 2 form circuit loop.
Corresponding circuit diagram while as shown in figure 10, being in the 7th operation mode for single-phase grid-connected inverter in Fig. 2.The 3rd power switch pipe QH1, the 4th power switch pipe QH2 and the tenth power switch pipe QS2 conducting, when electric current is timing, the first dividing potential drop capacitor C 1, the 3rd power switch pipe QH1, the 4th power switch pipe QH2, the second filter inductance L1, the 3rd filter capacitor C0, the first filter inductance LS, the tenth power switch pipe QS2 and the second dividing potential drop capacitor C 2 form circuit loop; When negative, the first dividing potential drop capacitor C 1, the first power diode D3, the 3rd filter inductance L2, the 3rd filter capacitor C0, the first filter inductance LS, the tenth power switch pipe QS2 and the second dividing potential drop capacitor C 2 form circuit loops when electric current.
Corresponding circuit diagram while as shown in figure 11, being in the 8th operation mode for single-phase grid-connected inverter in Fig. 2.The 3rd power switch pipe QH1, the 4th power switch pipe QH2 and the conducting of the 9th power switch QS1 pipe, when electric current is timing, the 3rd power switch pipe QH1, the 9th power switch pipe QS1, the first filter inductance LS, the 3rd filter capacitor CO, the second filter inductance L1 and the 4th power switch pipe QH2 form circuit loop; When negative, the first power diode D3, the 9th power switch pipe QS1, the first filter inductance LS, the 3rd filter capacitor C0 and the 3rd filter inductance L2 form circuit loop when electric current.
Corresponding circuit diagram while as shown in figure 12, being in the 9th operation mode for single-phase grid-connected inverter in Fig. 2.The first power switch pipe Q1, the second power switch pipe Q2, the 4th power switch pipe QH2, the 5th power switch pipe QH3 and the 9th power switch pipe QS1 conducting, when electric current is timing, the first dividing potential drop capacitor C 1, the 9th power switch pipe QS1, the first filter inductance LS, the 3rd filter capacitor C0, the second filter inductance L1, the 4th power switch pipe QH2 and the first power switch pipe Q1 form circuit loop; When negative, the first dividing potential drop capacitor C 1, the 9th power switch pipe QS1, the first filter inductance LS, the 3rd filter capacitor CO, the 3rd filter inductance L2, the 5th power switch pipe QH3 and the second power switch pipe Q2 form circuit loop when electric current.
Corresponding circuit diagram while as shown in figure 13, being in the tenth operation mode for single-phase grid-connected inverter in Fig. 2.The first power switch pipe Q1, the second power switch pipe Q2, the 4th power switch pipe QH2, the 5th power switch pipe QH3 and the tenth power switch pipe QS2 conducting, when electric current is timing, the second dividing potential drop capacitor C 2, the first power switch pipe Q1, the 4th power switch pipe QH2, the second filter inductance L1, the 3rd filter capacitor C0, the first filter inductance LS and the tenth power switch pipe QS2 form circuit loop, when electric current when negative, the second dividing potential drop capacitor C 2, the second power switch pipe Q2, the 5th power switch pipe QH3, the 3rd filter inductance L2, C0 the 3rd filter capacitor, the first filter inductance LS and the tenth power switch pipe QS2 form circuit loop.
As shown in figure 14, corresponding circuit diagram when in Fig. 2, single-phase grid-connected inverter is in 11 operation mode.The 5th power switch pipe QH3, the 6th power switch pipe QH4 and the tenth power switch pipe QS2 conducting, when electric current is timing, the tenth power switch pipe QS2, the first filter inductance LS, C0 the 3rd filter capacitor, the second filter inductance L1 and the second power diode D4 form circuit loop; When negative, the tenth power switch pipe QS2, the first filter inductance LS, the 3rd filter capacitor C0, the 3rd filter inductance L2, the 5th power switch pipe QH3 and the 6th power switch pipe QH4 form circuit loop when electric current.
As shown in figure 15, corresponding circuit diagram when in Fig. 2, single-phase grid-connected inverter is in 12 operation mode.The 5th power switch pipe QH3, the 6th power switch pipe QH4, the 9th power switch pipe conducting QS1, when electric current is timing, the first dividing potential drop capacitor C 1, the second dividing potential drop capacitor C 2, the second power diode D4, the second filter inductance L1, C0 the 3rd filter capacitor, the first filter inductance LS and the 9th power switch pipe QS1 form circuit loop; When negative, the first dividing potential drop capacitor C 1, the second dividing potential drop capacitor C 2, the 6th power switch pipe QH4, the 5th power switch pipe QH3, the 3rd filter inductance L2, the 3rd filter capacitor C0, the first filter inductance LS and the 9th power switch pipe QS1 form circuit loop when electric current.
In transitional period, drain current suppressing circuit work, the 9th power switch pipe QS1, the tenth power switch pipe QS2 high frequency action, the control PV cell panel voltage of parasitic capacitance over the ground carries out permanent slope transition between zero volt and whole busbar voltage, thereby allow the PV cell panel over the ground the voltage of parasitic capacitance between zero volt and busbar voltage crosswise rate slowly switch, suppress leakage current.Transitional period has comprised voltage and current zero crossing front and back a period of time, so under transitional each mode, when existing electric current is forward, when also having electric current to be negative sense.
The first above-mentioned operation mode, the second operation mode and the 3rd operation mode are the operation mode of the positive half cycle of line voltage, the 4th operation mode, the 5th operation mode and the 6th operation mode are the operation mode of line voltage negative half period, and the 7th operation mode, the 8th operation mode, the 9th operation mode, the tenth operation mode, the 11 operation mode and the 12 operation mode are the operation mode in the transitional period.
Power switch pipe in foregoing circuit can be metal-oxide-semiconductor or IGBT, and diode can be silicon carbide diode or fast recovery diode.
Another embodiment of the present invention also discloses a kind of single-phase grid-connected inverter, as shown in figure 16, in the disclosed single-phase grid-connected inverter of the present embodiment, by the first power switch pipe Q1 and the second power switch pipe Q2 in the embodiment of the 3rd power diode D1 and the 4th power diode D2 replacement corresponding diagram 2, concrete: the anode of the 3rd power diode D1 is connected with the series connection mid point of the second dividing potential drop capacitor C 2 with the first dividing potential drop capacitor C 1, and negative electrode is connected with the series connection mid point of the 4th power switch pipe QH2 with the 3rd power switch pipe QH1.The negative electrode of the 4th power diode D2 is connected with the series connection mid point of the second dividing potential drop capacitor C 2 with the first dividing potential drop capacitor C 1, and anode is connected with the series connection mid point of the 6th power switch pipe QH4 with the 5th power switch pipe QH3.
The content of other of the single-phase grid-connected inverter in the present embodiment is identical with the content of the embodiment of corresponding diagram 2, refers to the embodiment content of corresponding diagram 2, repeats no more herein.
And, in the present embodiment, the first power switch pipe Q1 and the second power switch pipe Q2 are replaced with the 3rd power diode D1 and the 4th power diode D2 respectively, not needing additionally increases the two-way drive circuit, provides cost savings.
Another embodiment of the present invention also discloses a kind of single-phase grid-connected inverter, as shown in figure 17, in the disclosed single-phase grid-connected inverter of the present embodiment, the second filter inductance L1 in Fig. 2 and the 3rd filter inductance L2 are changed to two small inductors the second filter inductance L1, the 3rd filter inductance L2 and large inductance the 4th a filter inductance L3, concrete: the second filter inductance L1 mono-end in two small inductors is connected with the 4th power switch pipe QH2, and the other end is connected with the end of the 4th filter inductance L3; The 3rd filter inductance L2 mono-end in two small inductors is connected with the 5th power switch pipe QH3, and the other end is connected with the end of the 4th filter inductance L3; The other end of the 4th filter inductance is connected with the 3rd filter capacitor C0.In the present embodiment, the second filter inductance L1 in Fig. 2 and the 3rd filter inductance L2 are changed to the cost that two small inductors the second filter inductance L1, the 3rd filter inductance L2 and large inductance the 4th filter inductance L3 have saved inductance.
In this specification, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is and the difference of other embodiment that between each embodiment, identical similar part is mutually referring to getting final product.
To the above-mentioned explanation of the disclosed embodiments, make professional and technical personnel in the field can realize or use the present invention.Multiple modification to these embodiment will be apparent for those skilled in the art, and General Principle as defined herein can be in the situation that do not break away from the spirit or scope of the present invention, realization in other embodiments.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (8)
1. a single-phase grid-connected inverter, is characterized in that, comprising: input dividing potential drop capacitance module, drain current suppressing circuit, with single-phase five level master topography modules and the output filtering module of power frequency brachium pontis; Wherein:
Described input dividing potential drop capacitance module is connected with the input direct-current source;
Described single-phase five level master topography modules with the power frequency brachium pontis are connected with described input dividing potential drop capacitance module, described input direct-current source, described drain current suppressing circuit and described output filtering module respectively;
Described drain current suppressing circuit is connected with described output filtering module with described input direct-current source, described single-phase five level master topography modules with the power frequency brachium pontis respectively.
2. single-phase grid-connected inverter according to claim 1, is characterized in that, described input dividing potential drop capacitance module comprises: the first dividing potential drop electric capacity and the second dividing potential drop electric capacity; Wherein:
Described the first dividing potential drop electric capacity is connected with described the second dividing potential drop electric capacity with described input direct-current source respectively;
Described the second dividing potential drop electric capacity is connected with described input direct-current source;
Described the first dividing potential drop electric capacity is connected with described single-phase five level master topography modules with the power frequency brachium pontis with the series connection mid point of described the second dividing potential drop electric capacity.
3. single-phase grid-connected inverter according to claim 2, it is characterized in that, described single-phase five level master topography modules with the power frequency brachium pontis comprise: the first power switch pipe, the second power switch pipe, the 3rd power switch pipe, the 4th power switch pipe, the 5th power switch pipe, the 6th power switch pipe, the 7th power switch pipe, the 8th power switch pipe, the first power diode and the second power diode; Wherein:
Described the first power switch pipe one end is connected with the series connection mid point of the second dividing potential drop electric capacity with described the first dividing potential drop electric capacity, and the other end is connected with the series connection mid point of the 4th power switch pipe with described the 3rd power switch pipe;
Described the second power switch pipe one end is connected with the series connection mid point of the second dividing potential drop electric capacity with described the first dividing potential drop electric capacity, and the other end is connected with the series connection mid point of described the 6th power switch pipe with described the 5th power switch pipe;
One end of described the 3rd power switch pipe is connected with described input direct-current source, and the other end is connected with described the 4th power switch pipe with described the first power switch pipe;
One end of described the 4th power switch pipe is connected with described the 3rd power switch pipe with described the first power switch pipe respectively, and the other end is connected with described output filtering module;
One end of described the 6th power switch pipe is connected with described input direct-current source, and the other end is connected with described the 5th power switch pipe with described the second power switch pipe;
One end of described the 5th power switch pipe is connected with described the 6th power switch pipe with described the second power switch pipe, and the other end is connected with described output filtering module;
One end of described the first power diode is connected with described the 5th power switch pipe, and the other end is connected with described input direct-current source;
One end of described the second power diode is connected with described input direct-current source, and the other end is connected with described the 4th power switch pipe;
One end of described the 7th power switch pipe is connected with described input direct-current source, and the other end is connected with an end of described the 8th power switch pipe;
The other end of described the 8th power switch pipe is connected with described input direct-current source;
The series connection mid point of described the 7th power switch pipe and described the 8th power switch pipe is connected with described output filtering module.
4. single-phase grid-connected inverter according to claim 2, it is characterized in that, described single-phase five level master topography modules with the power frequency brachium pontis comprise: the first power diode, the second power diode, the 3rd power diode, the 4th power diode, the 3rd power switch pipe, the 4th power switch pipe, the 5th power switch pipe, the 6th power switch pipe, the 7th power switch pipe and the 8th power switch pipe; Wherein:
Described the 3rd power diode one end is connected with the series connection mid point of the second dividing potential drop electric capacity with described the first dividing potential drop electric capacity, and the other end is connected with the series connection mid point of the 4th power switch pipe with described the 3rd power switch pipe;
Described the 4th power diode one end is connected with the series connection mid point of the second dividing potential drop electric capacity with described the first dividing potential drop electric capacity, and the other end is connected with the series connection mid point of described the 6th power switch pipe with described the 5th power switch pipe;
One end of described the 3rd power switch pipe is connected with described input direct-current source, and the other end is connected with described the 4th power switch pipe with described the 3rd power diode respectively;
One end of described the 4th power switch pipe is connected with described the 3rd power switch pipe with described the 3rd power diode respectively, and the other end is connected with described output filtering module;
One end of described the 6th power switch pipe is connected with described input direct-current source, and the other end is connected with described the 5th power switch pipe with described the 4th power diode;
One end of described the 5th power switch pipe is connected with described the 6th power switch pipe with described the 4th power diode, and the other end is connected with described output filtering module;
One end of described the first power diode is connected with described the 5th power switch pipe, and the other end is connected with described input direct-current source;
One end of described the second power diode is connected with described input direct-current source, and the other end is connected with described the 4th power switch pipe;
One end of described the 7th power switch pipe is connected with described input direct-current source, and the other end is connected with an end of described the 8th power switch pipe;
The other end of described the 8th power switch pipe is connected with described input direct-current source;
The series connection mid point of described the 7th power switch pipe and described the 8th power switch pipe is connected with described output filtering module.
5. according to the described single-phase grid-connected inverter of claim 3 or 4, it is characterized in that, described drain current suppressing circuit comprises: the 9th power switch pipe, the tenth power switch pipe, the first buffer resistance, the second buffer resistance, the first filter capacitor, the second filter capacitor and the first filter inductance; Wherein:
One end of described the 9th power switch pipe is connected with described input direct-current source, and the other end is connected with described the tenth power switch pipe;
Described the tenth power switch pipe one end is connected with described the 9th power switch pipe, and the other end is connected with described input direct-current source;
One end of described the first buffer resistance is connected with described input direct-current source, and the other end is connected with described the first filter capacitor;
Described the first filter capacitor one end is connected with described the first buffer resistance, and the other end is connected with described the second buffer resistance;
Described the second buffer resistance one end is connected with described the first filter capacitor, and the other end is connected with described the second filter capacitor;
Described the second filter capacitor one end is connected with described the second buffer resistance, and the other end is connected with described input direct-current source;
One end of described the first filter inductance is connected with the series connection mid point of described the tenth power switch pipe with described the 9th power switch pipe, and the other end is connected with described output filtering module with the series connection mid point of described the 8th power switch pipe with the series connection mid point of the second buffer resistance, described the 7th power switch pipe with described the first filter capacitor respectively.
6. single-phase grid-connected inverter according to claim 5, is characterized in that, described output filtering module comprises: the second filter inductance, the 3rd filter inductance and the 3rd filter capacitor; Wherein:
One end of described the second filter inductance is connected with described the 4th power switch pipe with described the second power diode, and the other end is connected with an end of described the 3rd filter capacitor;
One end of described the 3rd filter inductance is connected with described the 5th power switch pipe with described the first power diode, and the other end is connected with an end of described the 3rd filter capacitor;
The other end of described the 3rd filter capacitor is connected with the series connection mid point of the tenth power switch pipe with described the 9th power switch pipe.
7. single-phase grid-connected inverter according to claim 5, is characterized in that, described output filtering module comprises: the second filter inductance, the 3rd filter inductance, the 4th filter inductance and the 3rd filter capacitor; Wherein:
One end of described the second filter inductance is connected with described the 4th power switch pipe with described the second power diode, and the other end is connected with an end of described the 4th filter inductance;
One end of described the 3rd filter inductance is connected with described the 5th power switch pipe with described the first power diode, and the other end is connected with an end of described the 4th filter inductance;
The other end of described the 4th filter inductance is connected with an end of described the 3rd filter capacitor;
The other end of described the 3rd filter capacitor is connected with the series connection mid point of the tenth power switch pipe with described the 9th power switch pipe.
8. according to the described single-phase grid-connected inverter of claim 6 or 7, it is characterized in that, described single-phase grid-connected inverter comprises 12 operation modes, is respectively:
The first operation mode, described the 3rd power switch pipe, the 4th power switch pipe and the 7th power switch pipe conducting, all the other power switch pipes, the first power diode and the second power diode all end;
The second operation mode, described the first power switch pipe, the 4th power switch pipe and the 7th power switch pipe conducting, all the other power switch pipes, the first power diode and the second power diode all end;
The 3rd operation mode, described the 7th power switch pipe and the second power diode conducting, all the other power switch pipes and the first power diode all end;
The 4th operation mode, described the 8th power switch pipe and the first power diode conducting, all the other power switch pipes and the second power diode all end;
The 5th operation mode, described the 8th power switch pipe, the 5th power switch pipe and the second power switch pipe conducting, all the other power switch pipes, the first power diode and the second power diode all end;
The 6th operation mode, described the 8th power switch pipe, the 5th power switch pipe and the 6th power switch pipe conducting, all the other power switch pipes, the first power diode and the second power diode all end;
The 7th operation mode, described the 3rd power switch pipe, the first power diode, the 4th power switch pipe and the tenth power switch pipe conducting, all the other power switch pipes and the second power diode all end;
The 8th operation mode, described the 3rd power switch pipe, the first power diode, the 4th power switch pipe and the 9th power switch pipe conducting, all the other power switch pipes and the second power diode all end;
The 9th operation mode, described the first power switch pipe, the second power switch pipe, the 4th power switch pipe, the 5th power switch pipe and the 9th power switch pipe conducting, all the other power switch pipes, the first power diode and the second power diode all end;
The tenth operation mode, described the first power switch pipe, the second power switch pipe, the 4th power switch pipe, the 5th power switch pipe and the tenth power switch pipe conducting, all the other power switch pipes, the first power diode and the second power diode all end;
The 11 operation mode, described the 5th power switch pipe, the second power diode, the 6th power switch pipe and the tenth power switch pipe conducting, all the other power switch pipes and the first power diode all end;
The 12 operation mode, described the 5th power switch pipe, the second power diode, the 6th power switch pipe, the 9th power switch pipe conducting, all the other power switch pipes and the first power diode all end.
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| WO2017076366A1 (en) * | 2015-11-06 | 2017-05-11 | 汪洪亮 | Five-voltage level inverter topology circuit, and three-phase and five-voltage level inverter topology circuit |
| CN112152260A (en) * | 2020-09-17 | 2020-12-29 | 科华恒盛股份有限公司 | Photovoltaic power generation system PID effect repairing and inhibiting device |
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| CN102843054A (en) * | 2012-09-06 | 2012-12-26 | 阳光电源股份有限公司 | Single-phase five-level inverter |
| CN103178735A (en) * | 2013-03-13 | 2013-06-26 | 阳光电源股份有限公司 | Five-level inverter and method for controlling leakage current thereof |
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| EP2259420A1 (en) * | 2009-06-02 | 2010-12-08 | ABB Research Ltd. | Single phase inverter |
| CN102843054A (en) * | 2012-09-06 | 2012-12-26 | 阳光电源股份有限公司 | Single-phase five-level inverter |
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