Double-coil coupling inductance type impedance source inverter for inhibiting DC link voltage peak
阅读说明：本技术 抑制直流链电压尖峰的双线圈耦合电感型阻抗源逆变器 (Double-coil coupling inductance type impedance source inverter for inhibiting DC link voltage peak ) 是由 刘鸿鹏 张书鑫 张伟 于 2019-11-08 设计创作，主要内容包括：一种抑制直流链电压尖峰的双线圈耦合电感型阻抗源逆变器,属于电力电子技术领域。本发明针对现有双线圈耦合电感型阻抗源逆变器存在直流链电压尖峰过高易造成开关器件击穿的问题。它包括逆变桥电路,还包括电源电路以及钳位电路；所述电源电路包括直流电源V<Sub>in</Sub>、电感L<Sub>in</Sub>、二极管D<Sub>1</Sub>、双线圈耦合电感单元及电容C<Sub>1</Sub>；钳位电路包括电容C<Sub>2</Sub>、电容C<Sub>3</Sub>和二极管D<Sub>2</Sub>；逆变桥电路用于为电网或负载供电。本发明能够回收以电压尖峰形式消耗在开关管上的能量,进一步提高了逆变器的效率。(A double-coil coupling inductance type impedance source inverter for inhibiting a direct current link voltage peak belongs to the technical field of power electronics. The invention aims at the problem that the breakdown of a switching device is easily caused by overhigh DC link voltage spike in the conventional double-coil coupling inductance type impedance source inverter. The inverter comprises an inverter bridge circuit, a power supply circuit and a clamping circuit; the power circuit comprises a DC power supply V in Inductor L in Diode D 1 Double-coil coupling inductance unit and capacitor C 1 (ii) a The clamping circuit comprises a capacitor C 2 Capacitor C 3 And a diode D 2 (ii) a The inverter bridge circuit is used for supplying power to a power grid or a load. The invention can recover the energy consumed on the switching tube in the form of voltage spike, and further improves the efficiency of the inverter.)
1. A double-coil coupling inductance type impedance source inverter for inhibiting a direct current link voltage peak comprises an inverter bridge circuit, and is characterized by also comprising a power supply circuit and a clamping circuit;
the power circuit comprises a DC power supply VinInductor LinDiode D1Double-coil coupling inductance unit and capacitor C1；
The clamping circuit comprises a capacitor C2Capacitor C3And a diode D2；
DC power supply VinPositive electrode of (2) is connected with an inductor LinOne terminal of (1), inductance LinAnother end of the diode D2Anode of (2), diode D2Cathode connection ofContainer C3One terminal of (C), a capacitor3The other end of the DC power supply V is connected with a DC power supplyinThe negative electrode of (1);
the double-coil coupling inductance unit comprises two coupling inductances connected in series, and two ends and a middle leading-out end of the two coupling inductances are used as three connecting ends of the double-coil coupling inductance unit;
diode D1Anode of (2) connected to the diode D2Cathode of (2), diode D1The cathode of the double-coil coupling inductance unit is connected with the first connecting end of the double-coil coupling inductance unit, and the second connecting end of the double-coil coupling inductance unit is connected with the direct-current power supply VinBetween the negative poles of the capacitor C1Third connection terminal of double-coil coupling inductance unit and diode D2Between the anodes of which a capacitor C is connected2；
The third connecting end of the double-coil coupling inductance unit is connected with the positive input end of the inverter bridge circuit, and the negative input end of the inverter bridge circuit is connected with the direct-current power supply VinThe negative electrode of (1); the inverter bridge circuit is used for supplying power to a power grid or a load.
2. The DC-link voltage spike suppression dual coil coupled inductor-based impedance source inverter of claim 1, wherein the dual coil coupled inductor unit comprises a coupled inductor N1And a coupling inductor N2，
Coupling inductance N1The same name end of the coupling inductor N is used as the first connection end1The different name end of the inductor is connected with a coupling inductor N2End of same name, coupling inductance N2The end with different name as the third connecting end, coupling inductance N2As said second connection end.
3. The double-coil coupled-inductor impedance-source inverter for suppressing DC-link voltage spikes as set forth in claim 2,
the input voltage V of the inverter bridge circuitdcComprises the following steps:
wherein K is the coefficient of the coupling inductance,d is the through duty cycle;
order toThen the input voltage VdcComprises the following steps:
the output voltage v of the inverter bridge circuitoComprises the following steps:
vo＝BMVin，
wherein M is the modulation ratio.
4. The DC-link voltage spike suppression dual coil coupled inductor-based impedance source inverter of claim 1, wherein the dual coil coupled inductor unit comprises a coupled inductor N1And a coupling inductor N2，
Coupling inductance N1The same name end of the coupling inductor N is used as the first connection end1The different name end of the inductor is connected with a coupling inductor N2End of different name, coupling inductance N1The end with different name as the third connecting end, coupling inductance N2As said second connection end.
5. The DC-link voltage spike suppression dual coil coupled inductor-based impedance source inverter of claim 1, wherein the dual coil coupled inductor unit comprises a coupled inductor N1And a coupling inductor N2，
Coupling inductance N1The same name end of the coupling inductor N is used as the first connection end1Is connected with a coupling inductor N2End of same name, coupling inductance N2As the second connection terminal, a different name terminal ofFeeling N1The synonym end of (b) is used as the third connecting end.
Technical Field
The invention relates to a double-coil coupling inductance type impedance source inverter for inhibiting a voltage peak of a direct current link, and belongs to the technical field of power electronics.
Background
The double-coil coupling inductance type impedance source inverter, such as a T source inverter, an LCCT type Z source inverter, a gamma source inverter and the like, is an ideal high-boost-ratio impedance source inverter suitable for new energy sources such as photovoltaic power generation, wind power generation, biomass power generation and the like in the future. However, the current dual-coil coupled inductor-type impedance source inverter generally has the problem of over-high dc link voltage spike.
In the conventional design of the coupled inductor-type impedance source inverter, in order to deal with the problem that the breakdown of the switching tube is caused by the overhigh voltage spike of the direct current link, a switching device with higher voltage resistance is often adopted. However, the high-voltage-withstanding switching device has a lower doping degree and a weaker conductivity modulation effect, so that the on-resistance is higher. Such switching devices generate greater power losses when in operation. This not only reduces the efficiency of the power supply, but also increases the risk of failure of the switching device, and the volume of the corresponding heat sink also increases, so that the portability of the power supply is impaired.
Therefore, in view of the above disadvantages, it is desirable to provide a new dual-coil coupled inductor-type impedance source inverter capable of clamping the dc link voltage to improve the efficiency of the inverter.
Disclosure of Invention
The invention provides a double-coil coupling inductance type impedance source inverter for inhibiting a direct-current link voltage peak, aiming at the problem that the direct-current link voltage peak of the existing double-coil coupling inductance type impedance source inverter is too high to cause breakdown of a switching device.
The invention relates to a double-coil coupling inductance type impedance source inverter for inhibiting a direct current link voltage spike, which comprises an inverter bridge circuit, a power supply circuit and a clamping circuit, wherein the inverter bridge circuit is connected with the power supply circuit;
the power circuit comprises a DC power supply VinInductor LinDiode D1Double-coil coupling inductance unit and capacitor C1；
The clamping circuit comprises a capacitor C2Capacitor C3And a diode D2；
DC power supply VinPositive electrode of (2) is connected with an inductor LinOne terminal of (1), inductance LinAnother end of the diode D2Anode of (2), diode D2Cathode of (2) is connected with a capacitor C3One terminal of (C), a capacitor3Another end of (1) is connected withCurrent source VinThe negative electrode of (1);
the double-coil coupling inductance unit comprises two coupling inductances connected in series, and two ends and a middle leading-out end of the two coupling inductances are used as three connecting ends of the double-coil coupling inductance unit;
diode D1Anode of (2) connected to the diode D2Cathode of (2), diode D1The cathode of the double-coil coupling inductance unit is connected with the first connecting end of the double-coil coupling inductance unit, and the second connecting end of the double-coil coupling inductance unit is connected with the direct-current power supply VinBetween the negative poles of the capacitor C1Third connection terminal of double-coil coupling inductance unit and diode D2Between the anodes of which a capacitor C is connected2；
The third connecting end of the double-coil coupling inductance unit is connected with the positive input end of the inverter bridge circuit, and the negative input end of the inverter bridge circuit is connected with the direct-current power supply VinThe negative electrode of (1); the inverter bridge circuit is used for supplying power to a power grid or a load.
According to the double-coil coupling inductance type impedance source inverter for inhibiting the voltage spike of the direct current link, the first form of the double-coil coupling inductance unit comprises a coupling inductance N1And a coupling inductor N2，
Coupling inductance N1The same name end of the coupling inductor N is used as the first connection end1The different name end of the inductor is connected with a coupling inductor N2End of same name, coupling inductance N2The end with different name as the third connecting end, coupling inductance N2As said second connection end.
According to the double-coil coupling inductance type impedance source inverter for inhibiting the voltage spike of the direct current chain, the input voltage V of the inverter bridge circuitdcComprises the following steps:
wherein K is the coefficient of the coupling inductance,
order to
the output voltage v of the inverter bridge circuitoComprises the following steps:
vo＝BMVin，
wherein M is the modulation ratio.
According to the double-coil coupling inductance type impedance source inverter for inhibiting the voltage spike of the direct current link, the second form of the double-coil coupling inductance unit comprises a coupling inductance N1And a coupling inductor N2，
Coupling inductance N1The same name end of the coupling inductor N is used as the first connection end1The different name end of the inductor is connected with a coupling inductor N2End of different name, coupling inductance N1The end with different name as the third connecting end, coupling inductance N2As said second connection end.
According to the double-coil coupling inductance type impedance source inverter for inhibiting the voltage spike of the direct current link, the third form of the double-coil coupling inductance unit comprises a coupling inductance N1And a coupling inductor N2，
Coupling inductance N1The same name end of the coupling inductor N is used as the first connection end1Is connected with a coupling inductor N2End of same name, coupling inductance N2The different name end of the coupling inductor N is used as the second connecting end1The synonym end of (b) is used as the third connecting end.
The invention has the beneficial effects that: the invention provides an improved T-source inverter, an LCCT (lower control computer tomography) Z-source inverter and a gamma-source inverter, and the inverter with double-coil coupling inductance units in different connection forms is matched with a clamping circuit to realize the suppression of a voltage peak of a direct current chain, so that the hidden danger that a switching device is broken down is avoided, and the operation stability of the inverter is ensured; meanwhile, the invention can recover the energy consumed on the switching tube in the form of voltage spike, thereby further improving the efficiency of the inverter.
Drawings
Fig. 1 is a schematic structural diagram of a first embodiment of a dual-coil coupled-inductor impedance source inverter for suppressing dc link voltage spikes according to the present invention; the inverter bridge circuit comprises four switching tubes S1、S2、S3And S4(ii) a L in the figurefIs the output filter inductance, C, of the inverter bridge circuitfAn output filter capacitor of the inverter bridge circuit;
fig. 2 is a schematic structural diagram of a second embodiment of the dual-coil coupled-inductor impedance source inverter for suppressing dc link voltage spikes according to the present invention;
fig. 3 is a schematic structural diagram of a third embodiment of the dual-coil coupled-inductor impedance source inverter for suppressing dc link voltage spikes according to the present invention;
FIG. 4 is a waveform diagram illustrating the operation of the inverter according to the first embodiment; in the figure GSWFor switching tube drive signals, iC1Is flowed through a capacitor C1Current of (i)C2Is flowed through a capacitor C2Current of (i)C3Is flowed through a capacitor C3Current of (i)1Is flowed through N1Current of (i)2Is flowed through N2Current of (i)D2To flow through a diode D2Current of vD1Is a diode D1Voltage across, vD2Is a diode D2The voltage across;
FIG. 5 is [ t ] in FIG. 40,t1]Time period, through mode equivalent circuit diagram of the inverter; in the figure IinFor input of current, vLinIs an inductance LinVoltage across, VLKIs leakage inductance LKVoltage across, VC1Is the voltage across the capacitor C1, VC2Is the voltage across the capacitor C2, VC3Is the voltage across the capacitor C3, istIs the current flowing through the switch tube SW, vdcIs the voltage across the switch tube SW (DC bus voltage), Io is the load current，vLMIs an inductance LMThe voltage across (c).
FIG. 6 is [ t ] in FIG. 41,t2]Time period, through mode equivalent circuit diagram of the inverter;
FIG. 7 is [ t ] in FIG. 42,t3]Time period, non-through mode equivalent circuit diagram of the inverter;
FIG. 8 is [ t ] in FIG. 43,t0]Time period, non-through mode equivalent circuit diagram of the inverter;
FIG. 9 is a circuit diagram of a through mode equivalent operation of a prior art improved T-source inverter circuit;
FIG. 10 is a circuit diagram of the non-shoot-through mode equivalent operation of a prior art improved T-source inverter circuit;
FIG. 11 is a graph of experimental waveforms of input voltage current and output voltage current for an inverter embodying the first embodiment;
FIG. 12 is a graph of experimental waveforms of diode current voltage and DC link voltage in a circuit using an inverter as an example;
FIG. 13 is an experimental waveform diagram of diode current voltage and DC link voltage for a prior art improved T-source inverter circuit;
FIG. 14 is a graph comparing the efficiency of an inverter according to one embodiment with a prior art improved T-source inverter; the novel impedance
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The invention is further described with reference to the following drawings and specific examples, which are not intended to be limiting.
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