CN211908679U - T-shaped nested neutral point clamped hybrid multilevel converter and power generation system - Google Patents
T-shaped nested neutral point clamped hybrid multilevel converter and power generation system Download PDFInfo
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- CN211908679U CN211908679U CN202020302387.7U CN202020302387U CN211908679U CN 211908679 U CN211908679 U CN 211908679U CN 202020302387 U CN202020302387 U CN 202020302387U CN 211908679 U CN211908679 U CN 211908679U
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Abstract
The utility model relates to a nested neutral point of T type clamper mixes multilevel converter and power generation system. The converter comprises a first/second/third/fourth/fifth/sixth high-frequency power electronic switching tube, a first/second low-frequency power electronic switching tube and a first/second clamping capacitor; the first/second/fifth/sixth high-frequency power electronic switch tube is connected between the positive pole P point and the negative pole N point of the power generation device in series through a node P1, a node A and a node N1, the fourth/third high-frequency power electronic switch tube is connected with the node A in series, the first/second clamping capacitor is connected with the two ends of the second/fifth high-frequency power electronic switch tube in parallel after being connected with the first/second clamping capacitor in series, the middle point of the first/second clamping capacitor is connected with the third high-frequency power electronic switch tube, and the first/second low-frequency power electronic switch tube is connected between the positive pole P point and the negative pole N point of the power generation device in series. The utility model discloses can improve output waveform quality, reduce filter inductance, improve transform efficiency, reduce power electronic switch device quantity.
Description
Technical Field
The utility model belongs to the technical field of the electric energy conversion, by it relate to a nested neutral point of T type clamps mixes multilevel converter and uses its power generation system.
Background
Compared with a two-level converter, the multilevel converter has the advantages of small output voltage and current harmonic, small voltage change rate, high efficiency and the like, and is widely researched and applied to a renewable energy power generation system in recent years.
The traditional multilevel converter has diode clamping type, flying capacitor type, cascade H bridge and other topological structures. However, as the number of converter output levels increases, the number of devices required for diode-clamped multilevel converters and flying capacitor multilevel converters increases exponentially. And the cascaded H-bridge multilevel converter requires an isolated dc power supply. In order to overcome the disadvantages of conventional multilevel converters, a variety of new multilevel converter structures have been proposed in recent years. For example, in an invention patent entitled "a method for controlling a flying capacitor type five-level inverter" and patent No. ZL201410125395.8, a flying capacitor type five-level single-phase inverter is disclosed, in which the number of output levels of the inverter is 5, thereby improving the performance and efficiency of the inverter. For another example, in a utility model patent entitled "flying capacitor type five-level photovoltaic inverter" and having a patent number zl201120262122.x, a flying capacitor type five-level photovoltaic inverter is disclosed, each phase of which is composed of 8 power electronic switching tubes and 5 clamp capacitors, and each phase of the inverter outputs five levels, so that the performance and efficiency of the whole photovoltaic power generation system are improved, and the output current waveform quality of the inverter is improved.
For a single-phase converter of a distributed power generation system, the output of the single-phase converter mainly has two levels, three levels, five levels and the like. There is still room for improvement in output waveform quality, filter inductance, conversion efficiency, device count, etc. for these existing multilevel converters.
Disclosure of Invention
The utility model aims at providing a can further improve output waveform quality, reduce the filter inductance, improve conversion efficiency, reduce the nested neutral point of T type of power electronic switch device quantity and clamp mixed multilevel converter.
In order to achieve the above purpose, the utility model adopts the technical scheme that:
a T-shaped nested neutral point clamping hybrid multi-level converter is connected between a power generation device and a power grid, and comprises a first high-frequency power electronic switch tube, a second high-frequency power electronic switch tube, a third high-frequency power electronic switch tube, a fourth high-frequency power electronic switch tube, a fifth high-frequency power electronic switch tube, a sixth high-frequency power electronic switch tube, a first low-frequency power electronic switch tube, a second low-frequency power electronic switch tube, a first clamping capacitor and a second clamping capacitor;
the drain electrode of the first high-frequency power electronic switch tube is connected with the positive electrode P point of the power generation device, the source electrode of the first high-frequency power electronic switch tube is connected with the drain electrode of the second high-frequency power electronic switch tube through a node P1, the source electrode of the second high-frequency power electronic switch tube is connected with the drain electrode of the fifth high-frequency power electronic switch tube through a node A, the source electrode of the fifth high-frequency power electronic switch tube is connected with the drain electrode of the sixth high-frequency power electronic switch tube through a node N1, the source electrode of the sixth high-frequency power electronic switch tube is connected with the negative electrode N point of the power generation device, the node A is connected with the drain electrode of the fourth high-frequency power electronic switch tube, the source electrode of the fourth high-frequency power electronic switch tube is connected with the source electrode of the third high-frequency power electronic switch tube, and the first end of the first clamping capacitor is connected with the node P1, the second end of the first clamping capacitor is connected with the drain of the third high-frequency power electronic switch tube, the first end of the second clamping capacitor is connected with the node N1, and the second end of the second clamping capacitor is connected with the drain of the third high-frequency power electronic switch tube; the drain electrode of the first low-frequency power electronic switching tube is connected with the positive electrode P point of the power generation device, the source electrode of the first low-frequency power electronic switching tube is connected with the drain electrode of the second low-frequency power electronic switching tube through a node N, and the source electrode of the second low-frequency power electronic switching tube is connected with the negative electrode N point of the power generation device; the node A and the node n form an output end of the T-shaped nested neutral point clamped hybrid multilevel converter.
Preferably, the first high-frequency power electronic switch tube, the second high-frequency power electronic switch tube, the third high-frequency power electronic switch tube, the fourth high-frequency power electronic switch tube, the fifth high-frequency power electronic switch tube, and the sixth high-frequency power electronic switch tube are all MOSFET tubes, and the first low-frequency power electronic switch tube and the second low-frequency power electronic switch tube are all IGBT tubes.
Preferably, the voltage controlled by the first clamping capacitor and the voltage controlled by the second clamping capacitor are both Vdc/3 wherein VdcAnd the direct current bus voltage is output by the power generation device.
The T-shaped nested neutral point clamped hybrid multilevel converter has twelve working states;
in a first operating state, the first high-frequency power electronic switch tube, the second high-frequency power electronic switch tube, the third high-frequency power electronic switch tube and the second low-frequency power electronic switch tube are turned on, the fourth high-frequency power electronic switch tube, the fifth high-frequency power electronic switch tube, the sixth high-frequency power electronic switch tube and the first low-frequency power electronic switch tube are turned off, and an output voltage of the T-shaped nested neutral point clamped hybrid multilevel converter is Vdc；
In a second working state, the first high-frequency power electronic switch tube, the third high-frequency power electronic switch tube, the fourth high-frequency power electronic switch tube and the second low-frequency power electronic switch tube are turned on, the second high-frequency power electronic switch tube, the fifth high-frequency power electronic switch tube, the sixth high-frequency power electronic switch tube and the first low-frequency power electronic switch tube are turned off, and the T-shaped switch is turned onOutput voltage of nested neutral point clamped hybrid multilevel converter is 2Vdc/3；
In a third operating state, the second high-frequency power electronic switch tube, the third high-frequency power electronic switch tube, the sixth high-frequency power electronic switch tube and the second low-frequency power electronic switch tube are turned on, the first high-frequency power electronic switch tube, the fourth high-frequency power electronic switch tube, the fifth high-frequency power electronic switch tube and the first low-frequency power electronic switch tube are turned off, and the output voltage of the T-shaped nested neutral point clamped hybrid multilevel converter is 2Vdc/3；
In a fourth operating state, the first high-frequency power electronic switch tube, the fourth high-frequency power electronic switch tube, the fifth high-frequency power electronic switch tube, and the second low-frequency power electronic switch tube are turned on, the second high-frequency power electronic switch tube, the third high-frequency power electronic switch tube, the sixth high-frequency power electronic switch tube, and the first low-frequency power electronic switch tube are turned off, and an output voltage of the T-shaped nested neutral point clamped hybrid multilevel converter is Vdc/3；
In a fifth operating state, the third high-frequency power electronic switch tube, the fourth high-frequency power electronic switch tube, the sixth high-frequency power electronic switch tube and the second low-frequency power electronic switch tube are turned on, the first high-frequency power electronic switch tube, the second high-frequency power electronic switch tube, the fifth high-frequency power electronic switch tube and the first low-frequency power electronic switch tube are turned off, and an output voltage of the T-shaped nested neutral point clamped hybrid multilevel converter is Vdc/3；
In a sixth operating state, the fourth high-frequency power electronic switch tube, the fifth high-frequency power electronic switch tube, the sixth high-frequency power electronic switch tube, and the second low-frequency power electronic switch tube are turned on, the first high-frequency power electronic switch tube, the second high-frequency power electronic switch tube, the third high-frequency power electronic switch tube, and the first low-frequency power electronic switch tube are turned off, and an output voltage of the T-shaped nested neutral point clamped hybrid multilevel converter is 0;
in a seventh operating state, the first high-frequency power electronic switch tube, the second high-frequency power electronic switch tube, the third high-frequency power electronic switch tube and the first low-frequency power electronic switch tube are turned on, the fourth high-frequency power electronic switch tube, the fifth high-frequency power electronic switch tube, the sixth high-frequency power electronic switch tube and the second low-frequency power electronic switch tube are turned off, and the output voltage of the T-shaped nested neutral point clamped hybrid multilevel converter is 0;
in an eighth operating state, the first high-frequency power electronic switch tube, the third high-frequency power electronic switch tube, the fourth high-frequency power electronic switch tube and the first low-frequency power electronic switch tube are turned on, the second high-frequency power electronic switch tube, the fifth high-frequency power electronic switch tube, the sixth high-frequency power electronic switch tube and the second low-frequency power electronic switch tube are turned off, and an output voltage of the T-shaped nested neutral point clamped hybrid multilevel converter is-Vdc/3；
In a ninth operating state, the second high-frequency power electronic switch tube, the third high-frequency power electronic switch tube, the sixth high-frequency power electronic switch tube and the first low-frequency power electronic switch tube are turned on, the first high-frequency power electronic switch tube, the fourth high-frequency power electronic switch tube, the fifth high-frequency power electronic switch tube and the second low-frequency power electronic switch tube are turned off, and the output voltage of the T-shaped nested neutral point clamped hybrid multilevel converter is-Vdc/3；
In a tenth operating state, the first high-frequency power electronic switch tube, the fourth high-frequency power electronic switch tube, the fifth high-frequency power electronic switch tube and the first low-frequency power electronic switch tube are turned on, the second high-frequency power electronic switch tube, the third high-frequency power electronic switch tube, the sixth high-frequency power electronic switch tube and the second low-frequency power electronic switch tube are turned off, and the output voltage of the T-shaped nested neutral point clamped hybrid multilevel converter is-2Vdc/3；
In an eleventh operating state, the third high-frequency power electronic switch tube, the fourth high-frequency power electronic switch tube, the sixth high-frequency power electronic switch tube and the first low-frequency power electronic switch tube are turned on, the first high-frequency power electronic switch tube, the second high-frequency power electronic switch tube, the fifth high-frequency power electronic switch tube and the second low-frequency power electronic switch tube are turned off, and the output voltage of the T-shaped nested neutral point clamped hybrid multilevel converter is-2Vdc/3；
In a twelfth operating state, the fourth high-frequency power electronic switch tube, the fifth high-frequency power electronic switch tube, the sixth high-frequency power electronic switch tube and the first low-frequency power electronic switch tube are turned on, the first high-frequency power electronic switch tube, the second high-frequency power electronic switch tube, the third high-frequency power electronic switch tube and the second low-frequency power electronic switch tube are turned off, and the output voltage of the T-shaped nested neutral point clamped hybrid multilevel converter is-Vdc。
The utility model also provides a power generation system, its power generation facility, level converter, wave filter, electric wire netting including setting gradually, level converter adopts aforementioned nested neutral point of T type to clamp and mixes many level converter.
Preferably, the power generation device is a renewable energy power generation device.
Preferably, the power generation device is a photovoltaic power generation device.
Preferably, the filter includes a first filter inductor, a second filter inductor, and a filter capacitor, a first end of the first filter inductor is connected to the node a, a second end of the first filter inductor is connected to the node B, a first end of the second filter inductor is connected to the node n, a second end of the second filter inductor is connected to the node C, two ends of the filter capacitor are respectively connected to the node B and the node C, and the power grid is respectively connected to the node B and the node C.
Because of the application of the technical scheme, compared with the prior art, the utility model has the following advantages: the utility model discloses can further improve output waveform quality, reduce filter inductance, improve conversion efficiency, reduce power electronic switch device quantity, have fine application prospect.
Drawings
Fig. 1 is a schematic diagram of a power generation system including a T-type nested neutral point clamped hybrid multilevel converter according to the present invention.
Fig. 2 is a schematic diagram of an output state of a power generation system including a T-type nested neutral point clamped hybrid multilevel converter according to the present invention in a first operating state.
Fig. 3 is a schematic diagram of the output state of the power generation system including the T-type nested neutral point clamped hybrid multilevel converter according to the present invention in the second operating state.
Fig. 4 is a schematic diagram of an output state of the power generation system including the T-type nested neutral point clamped hybrid multilevel converter according to the present invention in a third operating state.
Fig. 5 is a schematic diagram of an output state of the power generation system including the T-type nested neutral point clamped hybrid multilevel converter according to the present invention in a fourth operating state.
Fig. 6 is a schematic diagram of an output state of the power generation system including the T-type nested neutral point clamped hybrid multilevel converter according to the present invention in a fifth operating state.
Fig. 7 is a schematic diagram of an output state of the power generation system including the T-type nested neutral point clamped hybrid multilevel converter according to the present invention in a sixth operating state.
Fig. 8 is a schematic diagram of an output state of the power generation system including the T-type nested neutral point clamped hybrid multilevel converter according to the present invention in a seventh operating state.
Fig. 9 is a schematic diagram of an output state of the power generation system including the T-type nested neutral point clamped hybrid multilevel converter according to the present invention under the eighth operating state.
Fig. 10 is a schematic diagram of an output state of a power generation system including a T-type nested neutral point clamped hybrid multilevel converter according to the present invention in a ninth operating state.
Fig. 11 is a schematic diagram of an output state of a power generation system including a T-type nested neutral point clamped hybrid multilevel converter according to the present invention in a tenth operating state.
Fig. 12 is a schematic diagram of an output state of a power generation system including a T-type nested neutral point clamped hybrid multilevel converter according to the present invention in an eleventh operating state.
Fig. 13 is a schematic diagram of an output state of a power generation system including a T-type nested neutral point clamped hybrid multilevel converter according to the present invention in a twelfth operating state.
Detailed Description
The invention will be further described with reference to examples of embodiments shown in the drawings.
The first embodiment is as follows: as shown in the attached figure 1, the power generation system comprises a power generation device, a level converter, a filter and a power grid e which are arranged in sequenceg. Wherein the power generation device is a renewable energy power generation device, such as a photovoltaic power generation device, and a power supply E is shown in figure 1dcAnd a resistance RdcAnd (4) equivalence.
Connected between the power plant and the grid egThe level converter adopts a T-shaped nested neutral point clamping hybrid multi-level converter which comprises a first high-frequency power electronic switch tube S1, a second high-frequency power electronic switch tube S2, a third high-frequency power electronic switch tube S3, a fourth high-frequency power electronic switch tube S4, a fifth high-frequency power electronic switch tube S5, a sixth high-frequency power electronic switch tube S6, a first low-frequency power electronic switch tube S7, a second low-frequency power electronic switch tube S8, a first clamping capacitor C1 and a second clamping capacitor C2.
The drain of the first high-frequency power electronic switch tube S1 is connected with the positive pole P point of the power generation device, the source of the first high-frequency power electronic switch tube S1 is connected with the drain of the second high-frequency power electronic switch tube S2 through a node P1, the source of the second high-frequency power electronic switch tube S2 is connected with the drain of the fifth high-frequency power electronic switch tube S5 through a node A, the source of the fifth high-frequency power electronic switch tube S5 is connected with the drain of the sixth high-frequency power electronic switch tube S6 through a node N1, the source of the sixth high-frequency power electronic switch tube S6 is connected with the negative pole N point of the power generation device, the node A is connected with the drain of the fourth high-frequency power electronic switch tube S4, the source of the fourth high-frequency power electronic switch tube S4 is connected with the source of the third high-frequency power electronic switch tube S3, the first end of the first clamping capacitor C1 is connected with the node P1, the second end of the first clamping capacitor C1 is connected with the drain of the third high-frequency power electronic, a first end of the second clamping capacitor C2 is connected with the node N1, and a second end of the second clamping capacitor C2 is connected with the drain of the third high-frequency power electronic switch tube S3; the drain electrode of the first low-frequency power electronic switch tube S7 is connected with the positive electrode P point of the power generation device, the source electrode of the first low-frequency power electronic switch tube S7 is connected with the drain electrode of the second low-frequency power electronic switch tube S8 through a node N, and the source electrode of the second low-frequency power electronic switch tube S8 is connected with the negative electrode N point of the power generation device; node a and node n form the output of the T-type nested neutral point clamped hybrid multilevel converter.
In the above scheme, the first high-frequency power electronic switch tube S1, the second high-frequency power electronic switch tube S2, the third high-frequency power electronic switch tube S3, the fourth high-frequency power electronic switch tube S4, the fifth high-frequency power electronic switch tube S5 and the sixth high-frequency power electronic switch tube S6 are all MOSFET tubes, and the first low-frequency power electronic switch tube S7 and the second low-frequency power electronic switch tube S8 are all IGBT tubes.
The filter comprises a first filter inductor L1, a second filter inductor L2 and a filter capacitor C3, wherein the first end of the first filter inductor L1 is connected with a node A, the second end of the first filter inductor L1 is connected with a node B, the first end of the second filter inductor L2 is connected with a node n, the second end of the second filter inductor L2 is connected with a node C, two ends of the filter capacitor C3 are respectively connected with the node B and the node C, and a power grid egRespectively connected to node B and node C.
The T-shaped nested neutral point clamped hybrid multilevel converter can be based on a power grid egThe LC filter can filter out higher harmonics in the converter, and meet the requirements ofAnd grid-connected inverters are connected to the grid to meet the requirements of each harmonic.
In the T-shaped nested neutral point clamped hybrid multilevel converter, the voltages controlled by the first clamping capacitor C1 and the second clamping capacitor C2 are both Vdc/3 wherein VdcThe direct current bus voltage is output by the power generation device.
The T-type nested neutral point clamped hybrid multilevel converter has twelve operating states, and the corresponding switch states and input voltages of the T-type nested neutral point clamped hybrid multilevel converter in each state are shown in table 1.
TABLE 1 relationship between output voltage and converter switching state of T-type nested neutral point clamped hybrid multilevel converter
As shown in fig. 2, in the first operating state, the first high-frequency power electronic switch tube S1, the second high-frequency power electronic switch tube S2, the third high-frequency power electronic switch tube S3 and the second low-frequency power electronic switch tube S8 are turned on, the fourth high-frequency power electronic switch tube S4, the fifth high-frequency power electronic switch tube S5, the sixth high-frequency power electronic switch tube S6 and the first low-frequency power electronic switch tube S7 are turned off, and the output voltage of the T-shaped nested neutral point clamped hybrid multilevel converter is Vdc。
As shown in fig. 3, in the second operating state, the first high-frequency power electronic switch tube S1, the third high-frequency power electronic switch tube S3, the fourth high-frequency power electronic switch tube S4 and the second low-frequency power electronic switch tube S8 are turned on, the second high-frequency power electronic switch tube S2, the fifth high-frequency power electronic switch tube S5, the sixth high-frequency power electronic switch tube S6 and the first low-frequency power electronic switch tube S7 are turned off, and the output voltage of the T-shaped nested neutral point clamped hybrid multilevel converter is 2Vdc/3。
As shown in fig. 4, in the third operating state, the second high-frequency power electronic switch tube S2, the third high-frequency power electronic switch tube S3, the sixth high-frequency power electronic switch tube S6, and the second low-frequency power electronic switch tubeS8 is conducted, the first high-frequency power electronic switch tube S1, the fourth high-frequency power electronic switch tube S4, the fifth high-frequency power electronic switch tube S5 and the first low-frequency power electronic switch tube S7 are turned off, and the output voltage of the T-shaped nested neutral point clamped hybrid multilevel converter is 2Vdc/3。
As shown in fig. 5, in the fourth operating state, the first high-frequency power electronic switch tube S1, the fourth high-frequency power electronic switch tube S4, the fifth high-frequency power electronic switch tube S5, and the second low-frequency power electronic switch tube S8 are turned on, the second high-frequency power electronic switch tube S2, the third high-frequency power electronic switch tube S3, the sixth high-frequency power electronic switch tube S6, and the first low-frequency power electronic switch tube S7 are turned off, and the output voltage of the T-shaped nested neutral point hybrid-clamped multilevel converter is Vdc/3。
As shown in fig. 6, in the fifth operating state, the third high-frequency power electronic switch tube S3, the fourth high-frequency power electronic switch tube S4, the sixth high-frequency power electronic switch tube S6 and the second low-frequency power electronic switch tube S8 are turned on, the first high-frequency power electronic switch tube S1, the second high-frequency power electronic switch tube S2, the fifth high-frequency power electronic switch tube S5 and the first low-frequency power electronic switch tube S7 are turned off, and the output voltage of the T-shaped nested neutral point clamped hybrid multilevel converter is Vdc/3。
As shown in fig. 7, in the sixth operating state, the fourth high-frequency power electronic switch tube S4, the fifth high-frequency power electronic switch tube S5, the sixth high-frequency power electronic switch tube S6, and the second low-frequency power electronic switch tube S8 are turned on, the first high-frequency power electronic switch tube S1, the second high-frequency power electronic switch tube S2, the third high-frequency power electronic switch tube S3, and the first low-frequency power electronic switch tube S7 are turned off, and the output voltage of the T-shaped nested neutral point clamped hybrid multilevel converter is 0.
As shown in fig. 8, in the seventh operating state, the first high-frequency power electronic switch tube S1, the second high-frequency power electronic switch tube S2, the third high-frequency power electronic switch tube S3, and the first low-frequency power electronic switch tube S7 are turned on, the fourth high-frequency power electronic switch tube S4, the fifth high-frequency power electronic switch tube S5, the sixth high-frequency power electronic switch tube S6, and the second low-frequency power electronic switch tube S8 are turned off, and the output voltage of the T-shaped nested neutral point clamped hybrid multilevel converter is 0.
As shown in fig. 9, in the eighth operating state, the first high-frequency power electronic switch tube S1, the third high-frequency power electronic switch tube S3, the fourth high-frequency power electronic switch tube S4 and the first low-frequency power electronic switch tube S7 are turned on, the second high-frequency power electronic switch tube S2, the fifth high-frequency power electronic switch tube S5, the sixth high-frequency power electronic switch tube S6 and the second low-frequency power electronic switch tube S8 are turned off, and the output voltage of the T-shaped nested neutral point clamped hybrid multilevel converter is-Vdc/3。
As shown in fig. 10, in the ninth operating state, the second high-frequency power electronic switch tube S2, the third high-frequency power electronic switch tube S3, the sixth high-frequency power electronic switch tube S6 and the first low-frequency power electronic switch tube S7 are turned on, the first high-frequency power electronic switch tube S1, the fourth high-frequency power electronic switch tube S4, the fifth high-frequency power electronic switch tube S5 and the second low-frequency power electronic switch tube S8 are turned off, and the output voltage of the T-shaped nested neutral point clamped hybrid multilevel converter is-Vdc/3。
As shown in fig. 11, in the tenth operating state, the first high-frequency power electronic switch tube S1, the fourth high-frequency power electronic switch tube S4, the fifth high-frequency power electronic switch tube S5 and the first low-frequency power electronic switch tube S7 are turned on, the second high-frequency power electronic switch tube S2, the third high-frequency power electronic switch tube S3, the sixth high-frequency power electronic switch tube S6 and the second low-frequency power electronic switch tube S8 are turned off, and the output voltage of the T-shaped nested neutral point clamped hybrid multilevel converter is-2Vdc/3。
As shown in fig. 12, in the eleventh operation state, the third high-frequency power electronic switch tube S3, the fourth high-frequency power electronic switch tube S4, the sixth high-frequency power electronic switch tube S6 and the first low-frequency power electronic switch tube S7 are turned on, the first high-frequency power electronic switch tube S1, the second high-frequency power electronic switch tube S2, the fifth high-frequency power electronic switch tube S5 and the second low-frequency power electronic switch tube S8 are turned off, and the T-shaped nested neutral point clamped hybrid multilevel converterThe output voltage is-2Vdc/3。
As shown in fig. 13, in the twelfth operating state, the fourth high-frequency power electronic switch tube S4, the fifth high-frequency power electronic switch tube S5, the sixth high-frequency power electronic switch tube S6 and the first low-frequency power electronic switch tube S7 are turned on, the first high-frequency power electronic switch tube S1, the second high-frequency power electronic switch tube S2, the third high-frequency power electronic switch tube S3 and the second low-frequency power electronic switch tube S8 are turned off, and the output voltage of the T-shaped nested neutral point clamped hybrid multilevel converter is-Vdc。
The T-shaped nested neutral point clamping hybrid multilevel converter device can output seven levels, the number of the required power electronic switching devices is 8 (6 high-frequency power electronic switching devices and 2 low-frequency power electronic switching devices), the output waveform quality of a single-phase inverter of a distributed power generation system can be further improved, the filter inductance is reduced, the efficiency is improved, the number of the power electronic switching devices is reduced, and the like. Compared with a two-level converter, the filter inductor of the converter can be greatly reduced.
To sum up, the beneficial effect of this scheme lies in: the topological structure fully utilizes the characteristics of low-voltage MOSFET (metal oxide semiconductor field effect transistor) of the power electronic switch device, such as small conduction and turn-off loss and the like, and only needs 6 high-frequency power electronic switches and 2 low-frequency power electronic switch devices. Compared with the traditional five-level converter, 2 more low-frequency power electronic switches and 2 less high-frequency power electronic switches are added. However, the number of output levels of the converter is increased from 5 to 7, so that the performance of the single-phase photovoltaic converter is greatly improved, and the filter inductance value of the inverter is greatly reduced. Therefore, the photovoltaic power generation system with the topological structure has a good application prospect.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable people skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.
Claims (7)
1. A T-shaped nested neutral point clamped hybrid multilevel converter is connected between a power generation device and a power grid, and is characterized in that: the T-shaped nested neutral point clamping hybrid multilevel converter comprises a first high-frequency power electronic switching tube, a second high-frequency power electronic switching tube, a third high-frequency power electronic switching tube, a fourth high-frequency power electronic switching tube, a fifth high-frequency power electronic switching tube, a sixth high-frequency power electronic switching tube, a first low-frequency power electronic switching tube, a second low-frequency power electronic switching tube, a first clamping capacitor and a second clamping capacitor;
the drain electrode of the first high-frequency power electronic switch tube is connected with the positive electrode P point of the power generation device, the source electrode of the first high-frequency power electronic switch tube is connected with the drain electrode of the second high-frequency power electronic switch tube through a node P1, the source electrode of the second high-frequency power electronic switch tube is connected with the drain electrode of the fifth high-frequency power electronic switch tube through a node A, the source electrode of the fifth high-frequency power electronic switch tube is connected with the drain electrode of the sixth high-frequency power electronic switch tube through a node N1, the source electrode of the sixth high-frequency power electronic switch tube is connected with the negative electrode N point of the power generation device, the node A is connected with the drain electrode of the fourth high-frequency power electronic switch tube, the source electrode of the fourth high-frequency power electronic switch tube is connected with the source electrode of the third high-frequency power electronic switch tube, and the first end of the first clamping capacitor is connected with the node P1, the second end of the first clamping capacitor is connected with the drain of the third high-frequency power electronic switch tube, the first end of the second clamping capacitor is connected with the node N1, and the second end of the second clamping capacitor is connected with the drain of the third high-frequency power electronic switch tube; the drain electrode of the first low-frequency power electronic switching tube is connected with the positive electrode P point of the power generation device, the source electrode of the first low-frequency power electronic switching tube is connected with the drain electrode of the second low-frequency power electronic switching tube through a node N, and the source electrode of the second low-frequency power electronic switching tube is connected with the negative electrode N point of the power generation device; the node A and the node n form an output end of the T-shaped nested neutral point clamped hybrid multilevel converter.
2. The T-type nested neutral point clamped hybrid multilevel converter of claim 1, wherein: the first high-frequency power electronic switch tube, the second high-frequency power electronic switch tube, the third high-frequency power electronic switch tube, the fourth high-frequency power electronic switch tube, the fifth high-frequency power electronic switch tube and the sixth high-frequency power electronic switch tube are MOSFET tubes, and the first low-frequency power electronic switch tube and the second low-frequency power electronic switch tube are IGBT tubes.
3. The T-type nested neutral point clamped hybrid multilevel converter of claim 1, wherein: the voltages controlled by the first clamping capacitor and the second clamping capacitor are allV dc /3 whereinV dc And the direct current bus voltage is output by the power generation device.
4. The utility model provides a power generation system, includes power generation facility, level converter, wave filter, the electric wire netting that sets gradually, its characterized in that: the level converter adopts a T-shaped nested neutral point clamped hybrid multi-level converter according to any one of claims 1 to 3.
5. The power generation system of claim 4, wherein: the power generation device is a renewable energy power generation device.
6. The power generation system of claim 5, wherein: the power generation device is a photovoltaic power generation device.
7. The power generation system of claim 4, wherein: the filter comprises a first filter inductor, a second filter inductor and a filter capacitor, wherein a first end of the first filter inductor is connected with the node A, a second end of the first filter inductor is connected with the node B, a first end of the second filter inductor is connected with the node n, a second end of the second filter inductor is connected with the node C, two ends of the filter capacitor are respectively connected with the node B and the node C, and the power grid is respectively connected with the node B and the node C.
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