CN110086365B - Neutral point self-balancing three-level grid-connected converter topology - Google Patents

Neutral point self-balancing three-level grid-connected converter topology Download PDF

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CN110086365B
CN110086365B CN201910367974.6A CN201910367974A CN110086365B CN 110086365 B CN110086365 B CN 110086365B CN 201910367974 A CN201910367974 A CN 201910367974A CN 110086365 B CN110086365 B CN 110086365B
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switch tube
capacitor
inductor
diode
direct current
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CN110086365A (en
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唐芬
陈鹏飞
刘京斗
吴学智
王玮
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Beijing Jiaotong University
Electric Power Research Institute of State Grid Sichuan Electric Power Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/483—Converters with outputs that each can have more than two voltages levels
    • H02M7/487—Neutral point clamped inverters

Abstract

The invention belongs to the technical field of power electronics, and relates to a neutral point self-balancing topology for a three-level grid-connected converter, which is used for a distributed power generation system. The method comprises the following steps: three-level converter and inductorLa、Lb、Lc、Lga、Lgb、LgcCapacitor CaCapacitor CbCapacitor CcCapacitor CrAnd a capacitor C arranged on the DC side1And a capacitor C2. The topology provided by the invention can be used for arranging the capacitor C on the direct current side1、C2When the divided voltage is uneven, the voltage on the direct current side is quickly averaged, and the voltage is maintained to be averaged; on the premise of not increasing a switching device and a direct current side voltage sensor, the topology provided by the invention can realize self-balancing direct current side midpoint potential, avoid unequal voltage stress of the switching tube, improve grid-connected current quality and prolong the service life of the converter.

Description

Neutral point self-balancing three-level grid-connected converter topology
Technical Field
The invention belongs to the technical field of power electronics, and particularly relates to a midpoint self-balancing three-level grid-connected converter topology for a distributed power supply grid-connected system.
Background
With the rapid development of the distributed power supply, the grid-connected converter is used as an interactive interface between the distributed power supply and a power grid, and plays a role in playing a vital role. The three-level neutral point clamped NPC and T-NPC structure converters are widely applied to high-power-level systems due to low output harmonic content. Under the ideal condition, the direct current side of the three-level converter is formed by connecting two voltage-dividing capacitors with the same parameters in series, the voltage of the capacitors is half of the direct current bus voltage, but in an actual system, due to factors such as capacitance value deviation of the capacitors, even harmonic waves of modulated waves, unbalanced three-phase load operation and the like, the problem of midpoint potential drift exists. And the neutral point potential drift will deteriorate the quality of electric energy, so that the low harmonic content of the grid-connected current is increased.
The method mainly comprises two modes of improving a modulation strategy and adding a hardware circuit by using a control algorithm, when a circuit uses an SVPWM (space vector pulse width modulation) modulation mode, the midpoint potential is adjusted by measuring a capacitance potential difference value and changing the action time of a redundant vector, but the mode is at the cost of increasing harmonic distortion, using a complex control strategy and using more voltage sensors, calculating an injected neutral current value according to the midpoint voltage difference value by introducing a coefficient of the relation between the midpoint current and the capacitance midpoint potential, but the method does not consider the deviation of a direct current side capacitance value, when the capacitance of a direct current side is deviated, the algorithm cannot be well applied, and the self-balancing concept can naturally stabilize the neutral point at the direct current side midpoint.
Disclosure of Invention
Aiming at the technical problem, the invention provides a neutral point self-balancing three-level grid-connected converter topology which can construct a zero-sequence current path between a neutral point of a filter capacitor and a neutral point of a direct-current side capacitor, reduce the impedance value of the path through series resonance and realize circuit self-balancing.
The invention is realized by the following technical scheme:
a midpoint self-balancing three-level grid-connected converter topology, comprising: capacitor CaCapacitor CbCapacitor CcCapacitor CrAnd a capacitor C arranged on the DC side1And a capacitor C2Three level converter, inductor LaInductor LbInductor LcInductor LgaInductor LgbInductor Lgc6 inductors are arranged;
the capacitor C1Is connected with the positive pole of the direct current power supply, and the capacitor C2Is connected with the negative pole of the direct current power supply, and the capacitor C1And the other end of said capacitor C2The other ends of the two capacitors are connected to form a capacitor midpoint O point;
the positive pole of the direct current power supply, the negative pole of the direct current power supply and the point O of the middle point of the capacitor are all connected with one end of the three-level converter, and the other end of the three-level converter is respectively connected with the inductor LaThe inductor LbAnd the inductor LcIs connected with one end of the connecting rod;
the inductor LaAnd the other end of the capacitor CaAnd the inductor LgaIs connected to one end of the inductor LbAnd the other end of the capacitor CbAnd the inductor LgbIs connected to one end of the inductor LcAnd the other end of the capacitor CcAnd the inductor LgcOne end of the two ends are connected;
the capacitor CaThe capacitor CbAnd the capacitor CcThe other ends of the two capacitors are connected with each other to form a capacitance neutral point; the capacitor CrIs connected to the neutral point of the capacitor, the capacitor CrThe other end of the capacitor is connected with the point O of the middle point of the capacitor, the positive pole of the direct current power supply or the negative pole of the direct current power supply;
the inductor LgaThe inductor LgbAnd the inductor LgcThe other end of the three-phase transformer is respectively connected with a, b and c phases of the power grid.
Furthermore, when the three-level converter adopts an NPC structure, the three-level converter comprises a switching tube S1Switch tube S2Switch tube S3Switch tube S4Switch tube S5Switch tube S6Switch tube S7Switch tube S8Switch tube S9Switch tube S10Switch tube S11Switch tube S1212 switching tubes, and a diode D1Diode D2Diode D3Diode D4Diode D5Diode D66 diodes;
the switch tube S1The switch tube S5And the switch tube S9The D ends of the two-way switch are connected with the positive electrode of a direct current power supply;the switch tube S2The switch tube S6And the switch tube S10Respectively with the switching tube S1The switch tube S5And the switch tube S9Is connected to the S terminal, and the diode D1The diode D2The diode D3Respectively with said switching tube S1The switch tube S5And the switch tube S9The S end of the cable is connected; the diode D1The diode D2The diode D3The P poles of the capacitors are connected with the point O of the middle point of the capacitor;
the switch tube S4The switch tube S8And the switch tube S12The S ends are connected with the negative electrode of the direct current power supply; the switch tube S3The switch tube S7And the switch tube S11Respectively with the switching tube S4The switch tube S8And the switch tube S12And the diode D is connected4The diode D5And the diode D6Respectively with said switching tube S4The switch tube S8And the switch tube S12The D end of the N-terminal is connected; the diode D4The diode D5And the diode D6The N poles of the capacitors are connected with the point O of the middle point of the capacitor;
the switch tube S2And the switch tube S3D terminal of (a) and the inductor LaOne end of the two ends are connected; the switch tube S6And the switch tube S7D terminal of (a) and the inductor LbOne end of the two ends are connected; the switch tube S10And the switch tube S11D terminal of (a) and the inductor LcAre connected at one end.
Furthermore, when the three-level converter adopts a TNPC structure, the three-level converter comprises a switch tube S1Switch tube S2Switch tube S3Switch tube S4Switch tube S5Switch tube S6Switch tube S7Switch tube S8Switch tube S9Switch tube S10Switch tube S11Switch tube S1212 switching tubes;
the switch tube S1The switch tube S5And the switch tube S9The D ends of the two-way switch are connected with the positive electrode of a direct current power supply; the switch tube S4The switch tube S8And the switch tube S12The S ends are connected with the negative electrode of the direct current power supply; the switch tube S3The switch tube S7And the switch tube S11The S ends of the capacitors are connected with the point O of the middle point of the capacitor; the switch tube S2The switch tube S6And the switch tube S10Respectively with the switching tube S3The switch tube S7And the switch tube S11The D end of the N-terminal is connected;
the switch tube S1End S of the switch tube S2And the switch tube S4D terminal of (a) and the inductor LaOne end of the two ends are connected;
the switch tube S5End S of the switch tube S6And the switch tube S8D terminal of (a) and the inductor LbOne end of the two ends are connected;
the switch tube S9End S of the switch tube S10And the switch tube S12D terminal of (a) and the inductor LcAre connected at one end.
Further, the inductor LaThe inductor LbThe inductor LcThe inductor LgaThe inductor LgbThe inductor LgcAnd said capacitor CaThe capacitor CbThe capacitor CcConstituting an L C L filter.
Further, the capacitance CrThe parameter selection satisfies the following conditions:
Figure BDA0002048868470000051
x＝a,b,c
wherein, ω iscIs the carrier frequency.
Furthermore, when the adopted switch tube is an insulated gate bipolar transistor with an anti-parallel diode, the D end of the switch tube is a collector, the S end of the switch tube is an emitter, and the G end of the switch tube is a gate;
when the adopted switching tube is a metal oxide layer semiconductor field effect transistor, the D end of the switching tube is a drain electrode, the S end of the switching tube is a source electrode, and the G end of the switching tube is a grid electrode;
the invention has the beneficial effects that:
(1) the invention provides a neutral point self-balancing three-level grid-connected converter topology which comprises the following steps: when the voltage division of the direct current side capacitor is unbalanced, the capacitor C is usedrThe direct current side capacitor neutral point, the direct current power supply positive pole or the direct current power supply negative pole are connected, and a backflow passage is provided for zero sequence current; through a capacitor CrAnd the capacitance value is reasonably selected, and the zero-sequence path impedance is reduced by using series resonance, so that carrier frequency sub-current in the neutral current is increased, and further, the direct-current side voltage division balance is realized.
(2) The neutral point self-balancing three-level grid-connected converter topology provided by the invention can improve the voltage sharing time of the direct current side under the condition of not increasing a switching device and a direct current side voltage sensor, thereby avoiding unequal voltage stress of a switching tube, improving the grid-connected current quality and prolonging the service life of the converter.
Drawings
FIG. 1 is a topological structure diagram of a neutral-point self-balancing three-level grid-connected converter (capacitor C) according to an embodiment of the present inventionrThe other end of which is connected to the capacitor midpoint O).
FIG. 2 is a topological structure diagram of a neutral-point self-balancing three-level grid-connected converter (capacitor C) in the embodiment of the present inventionrThe other end of the first switch is connected with the positive pole of the direct current power supply).
FIG. 3 is a topological structure diagram of a neutral-point self-balancing three-level grid-connected converter (capacitor C) according to an embodiment of the present inventionrThe other end of the direct current power supply is connected with the negative electrode of the direct current power supply).
Fig. 4 is a topology structure diagram of a midpoint self-balancing three-level grid-connected converter in another embodiment of the present invention;
fig. 5 is a topology structure diagram of a midpoint self-balancing three-level grid-connected converter in another embodiment of the present invention;
fig. 6 shows a dc voltage midpoint balance time and an experimental waveform of a conventional three-level converter;
fig. 7 shows the dc voltage midpoint balance time and experimental waveforms of the topology of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
On the contrary, the invention is intended to cover alternatives, modifications, equivalents and alternatives which may be included within the spirit and scope of the invention as defined by the appended claims. Furthermore, in the following detailed description of the present invention, certain specific details are set forth in order to provide a better understanding of the present invention. It will be apparent to one skilled in the art that the present invention may be practiced without these specific details.
The neutral point potential drift control method aims at the technical problem that in the prior art, a three-level converter has neutral point potential drift, and the neutral point potential drift deteriorates the quality of electric energy, so that the low-order harmonic content of grid-connected current is increased.
The invention provides a topological embodiment of a neutral point self-balancing three-level grid-connected converter, which comprises the following components in parts by weight as shown in figures 1-3: capacitor CaCapacitor CbCapacitor CcCapacitor CrAnd a capacitor C arranged on the DC side1And a capacitor C2Three level converter, inductor LaInductor LbInductor LcInductor LgaInductor LgbInductor Lgc6 inductors are arranged;
the capacitor C1Is connected with the positive pole of the direct current power supply, and the capacitor C2Is connected with the negative pole of the direct current power supply, and the capacitor C1And the other end of said capacitor C2The other ends of the two capacitors are connected to form a capacitor midpoint O point;
the positive pole of the direct current power supply, the negative pole of the direct current power supply and the point O of the middle point of the capacitor are all connected with one end of the three-level converter, and the other end of the three-level converter is respectively connected with the inductor LaThe inductor LbAnd the inductor LcIs connected with one end of the connecting rod;
the inductor LaAnd the other end of the capacitor CaAnd the inductor LgaIs connected to one end of the inductor LbAnd the other end of the capacitor CbAnd the inductor LgbIs connected to one end of the inductor LcAnd the other end of the capacitor CcAnd the inductor LgcOne end of the two ends are connected;
the capacitor CaThe capacitor CbAnd the capacitor CcThe other ends of the two capacitors are connected with each other to form a capacitance neutral point; the capacitor CrIs connected to the neutral point of the capacitor, the capacitor CrThe other end of the capacitor is connected with the point O (figure 1) of the middle point of the capacitor, the positive pole (figure 2) of the direct current power supply or the negative pole (figure 3) of the direct current power supply;
the inductor LgaThe inductor LgbAnd the inductor LgcThe other end of the three-phase transformer is respectively connected with a, b and c phases of the power grid.
The invention also provides a topology embodiment of a midpoint self-balancing three-level grid-connected converter, as shown in fig. 4, including: switch tube S1Switch tube S2Switch tube S3Switch tube S4Switch tube S5Switch tube S6Switch tube S7Switch tube S8Switch tube S9Switch tube S10Switch tube S11Switch tube S1212 switching tubes, diode D1Diode D2Diode D3Diode D4Diode D5Diode D66 diodes, inductor LaInductor LbInductor LcInductor LgaInductor LgbInductor Lgc6 inductors and capacitors CaCapacitor CbCapacitor CcCapacitor C1Capacitor C2Capacitor Cr6 capacitors;
the capacitor C1Is connected with the positive pole of the direct current power supply, and the capacitor C2Is connected with the negative pole of the direct current power supply, and the capacitor C1And the other end of said capacitor C2The other ends of the two capacitors are connected to form a capacitor midpoint O point;
the switch tube S1The switch tube S5And the switch tube S9The D ends of the two-way switch are connected with the positive electrode of a direct current power supply; the switch tube S2The switch tube S6And the switch tube S10Respectively with the switching tube S1The switch tube S5And the switch tube S9Is connected to the S terminal, and the diode D1The diode D2The diode D3Respectively with said switching tube S1The switch tube S5And the switch tube S9The S end of the cable is connected; the diode D1The diode D2The diode D3The P poles of the capacitors are connected with the point O of the middle point of the capacitor;
the switch tube S4The switch tube S8And the switch tube S12The S ends are connected with the negative electrode of the direct current power supply; the switch tube S3The switch tube S7And the switch tube S11Respectively with the switching tube S4The switch tube S8And the switch tube S12And the diode D is connected4The diode D5And the diode D6Respectively with said switching tube S4The switch tube S8And the switch tube S12The D end of the N-terminal is connected; the diode D4The diode D5And the diode D6The N poles of the capacitors are connected with the point O of the middle point of the capacitor;
the switch tube S2And the switch tube S3D terminal of (a) and the inductor LaOne end of the two ends are connected; the switch tube S6And the switch tube S7D terminal of (a) and the inductor LbOne end of the two ends are connected; the switch tube S10And the switch tube S11D terminal of (a) and the inductor LcOne end of the two ends are connected;
the inductor LaAnd the other end of the capacitor CaAnd the inductor LgaIs connected to one end of the inductor LbAnd the other end of the capacitor CbAnd the inductor LgbIs connected to one end of the inductor LcAnd the other end of the capacitor CcAnd the inductor LgcOne end of the two ends are connected;
the capacitor CaThe capacitor CbAnd the capacitor CcAnd the other end of the capacitor C is connected with the capacitor CrIs connected to one end of the capacitor CrIs connected to the capacitor midpoint O (in other embodiments, the capacitor C is connected to the capacitor midpoint O)rThe other end of the first power supply can be connected with the positive electrode of the direct current power supply or the negative electrode of the direct current power supply);
the inductor LgaThe inductor LgbAnd the inductor LgcThe other end of the three-phase transformer is respectively connected with a, b and c phases of the power grid.
The invention also provides a topology embodiment of a midpoint self-balancing three-level grid-connected converter, as shown in fig. 5, including: capacitor CaCapacitor CbCapacitor CcCapacitor CrAnd a capacitor C arranged on the DC side1And a capacitor C2Three level converter, inductor LaInductor LbInductor LcInductor LgaInductor LgbInductor Lgc6 inductors are arranged; the three-level converter comprises a switch tube S1Switch tube S2Switch tube S3Switch tube S4Switch tube S5Switch tube S6Switch tube S7Switch tube S8Switch tube S9Switch tube S10Switch tube S11Switch tube S1212 switching tubes;
the capacitor C1Is connected with the positive pole of the direct current power supply, and the capacitor C2Is connected with the negative pole of the direct current power supply, and the capacitor C1And the other end of said capacitor C2The other ends of the two capacitors are connected to form a capacitor midpoint O point;
the switch tube S1The switch tube S5And the switch tube S9The D ends of the two-way switch are connected with the positive electrode of a direct current power supply; the switch tube S4The switch tube S8And the switch tube S12The S ends are connected with the negative electrode of the direct current power supply; the switch tube S3The switch tube S7And the switch tube S11The S ends of the capacitors are connected with the point O of the middle point of the capacitor; the switch tube S2The switch tube S6And the switch tube S10Respectively with the switching tube S3The switch tube S7And the switch tube S11The D end of the N-terminal is connected;
the switch tube S1End S of the switch tube S2And the switch tube S4D terminal of (a) and the inductor LaOne end of the two ends are connected;
the switch tube S5End S of the switch tube S6And the switch tube S8D terminal of (a) and the inductor LbOne end of the two ends are connected;
the switch tube S9End S of the switch tube S10And the switch tube S12D terminal of (a) and the inductor LcOne end of the two ends are connected;
the inductor LaAnd the other end of the capacitor CaAnd the inductor LgaIs connected to one end of the inductor LbAnd the other end of the capacitor CbAnd the inductor LgbIs connected to one end of the inductor LcAnd the other end of the capacitor CcAnd the inductor LgcOne end of the two ends are connected;
the capacitor CaThe capacitor CbAnd the capacitor CcAnd the other end of the capacitor C is connected with the capacitor CrIs connected to one end ofSaid capacitor CrIs connected to the capacitor midpoint O (in other embodiments, the capacitor C is connected to the capacitor midpoint O)rThe other end of the first power supply can be connected with the positive electrode of the direct current power supply or the negative electrode of the direct current power supply);
the inductor LgaThe inductor LgbAnd the inductor LgcThe other end of the three-phase transformer is respectively connected with a, b and c phases of the power grid.
In the above embodiment, the inductor LaThe inductor LbThe inductor LcThe inductor LgaThe inductor LgbThe inductor LgcAnd said capacitor CaThe capacitor CbThe capacitor CcAnd forming an L C L filter for filtering high-frequency harmonic current in the current.
In the above embodiment, the capacitor CrThe parameter selection satisfies the following conditions:
Figure BDA0002048868470000111
x＝a,b,c
wherein, ω iscIs the carrier angular frequency.
According to SPWM modulation of the three-level converter and double Fourier of a switching function, when the voltage on the direct current side has deviation, the output phase voltage is distorted, and the distorted harmonic content is mainly divided into even low-frequency harmonic, carrier frequency and sideband harmonic. The topology provided by the above embodiments of the present invention is implemented by a capacitor CrForming a new zero sequence path, wherein CrThe values are calculated according to the formula. The zero sequence path series resonance frequency is selected as carrier frequency, and because the series resonance impedance is low, carrier frequency zero sequence current caused by direct current side unbalance can be more led back to the direct current side capacitor midpoint, so that the direct current side capacitor voltage can be quickly equally divided.
Fig. 6 shows the midpoint potential balance time and the experimental waveform of the conventional three-level converter, and fig. 7 shows the midpoint potential balance time and the experimental waveform of the direct current side of the topological structure of the present invention.
In the above embodiment, when the adopted switching tube is an insulated gate bipolar transistor with an anti-parallel diode, the D end of the switching tube is a collector, the S end of the switching tube is an emitter, and the G end of the switching tube is a gate; when the adopted switching tube is a metal oxide layer semiconductor field effect transistor, the D end of the switching tube is a drain electrode, the S end of the switching tube is a source electrode, and the G end of the switching tube is a grid electrode.

Claims (4)

1. A neutral point self-balancing three-level grid-connected converter topology is characterized by comprising: capacitor CaCapacitor CbCapacitor CcCapacitor CrA capacitor C arranged at the DC side1And a capacitor C2Three-level converter, inductor LaInductor LbInductor LcInductor LgaInductor LgbInductor Lgc6 inductors are arranged;
the capacitor C1Is connected with the positive pole of the direct current power supply, and the capacitor C2Is connected with the negative pole of the direct current power supply, and the capacitor C1And the other end of said capacitor C2The other ends of the two capacitors are connected to form a capacitor midpoint O point;
the positive pole of the direct current power supply, the negative pole of the direct current power supply and the point O of the middle point of the capacitor are all connected with one end of the three-level converter, and the other end of the three-level converter is respectively connected with the inductor LaThe inductor LbAnd the inductor LcIs connected with one end of the connecting rod;
the inductor LaAnd the other end of the capacitor CaAnd the inductor LgaIs connected to one end of the inductor LbAnd the other end of the capacitor CbAnd the inductor LgbIs connected to one end of the inductor LcAnd the other end of the capacitor CcAnd the inductor LgcOne end of the two ends are connected;
the capacitor CaStation, stationThe capacitor CbAnd the capacitor CcThe other ends of the two capacitors are connected with each other to form a capacitance neutral point; the capacitor CrIs connected to the neutral point of the capacitor, the capacitor CrThe other end of the capacitor is connected with the point O of the middle point of the capacitor, the positive pole of the direct current power supply or the negative pole of the direct current power supply;
the inductor LgaIs connected with the a phase of the power grid, the inductance LgbIs connected with the b phase of the power grid, the inductor LgcThe other end of the second power supply is connected with the c phase of the power grid;
the capacitor CrThe parameter selection satisfies the following conditions:
Figure FDA0002515368260000021
x＝a,b,c
wherein, ω iscIs the carrier angular frequency.
2. The topology of claim 1, wherein the three-level converter adopts an NPC topology structure and comprises a switching tube S1Switch tube S2Switch tube S3Switch tube S4Switch tube S5Switch tube S6Switch tube S7Switch tube S8Switch tube S9Switch tube S10Switch tube S11Switch tube S1212 switching tubes, and a diode D1Diode D2Diode D3Diode D4Diode D5Diode D66 diodes;
the switch tube S1The switch tube S5And the switch tube S9The D ends of the two-way switch are connected with the positive electrode of a direct current power supply; the switch tube S2End D and the switch tube S1Is connected with the S end of the switch tube S6End D and the switch tube S5Is connected with the S end of the switch tube S10End D and the switch tube S9Is connected to the S terminal, and the diode D1N pole and the switching tube S1Is connected to the S terminal of the diode D2N pole and the switching tube S5Is connected to the S terminal of the diode D3N pole and the switching tube S9The S end of the cable is connected; the diode D1The diode D2The diode D3The P poles of the capacitors are connected with the point O of the middle point of the capacitor;
the switch tube S4The switch tube S8And the switch tube S12The S ends are connected with the negative electrode of the direct current power supply; the switch tube S3And the switch tube S4D end of the switch tube S is connected with the D end of the switch tube7And the switch tube S8D end of the switch tube S is connected with the D end of the switch tube11And the switch tube S12And the diode D is connected4P pole and the switch tube S4Is connected to the D terminal of the diode D5P pole and the switch tube S8Is connected to the D terminal of the diode D6P pole and the switch tube S12The D end of the N-terminal is connected; the diode D4The diode D5And the diode D6The N poles of the capacitors are connected with the point O of the middle point of the capacitor;
the switch tube S2And the switch tube S3D terminal of (a) and the inductor LaOne end of the two ends are connected; the switch tube S6And the switch tube S7D terminal of (a) and the inductor LbOne end of the two ends are connected; the switch tube S10And the switch tube S11D terminal of (a) and the inductor LcAre connected at one end.
3. The topology of claim 1, wherein the topology of the three-level converter adopts a TNPC topology and comprises a switch tube S1Switch tube S2Switch tube S3Switch tube S4Switch tube S5Switch tube S6Switch tube S7Switch tube S8Switch tube S9Switch tube S10Switch tube S11Switch tube S1212 switching tubes;
the switch tube S1The switch tube S5And the switch tube S9The D ends of the two-way switch are connected with the positive electrode of a direct current power supply; the switch tube S4The switch tube S8And the switch tube S12The S ends are connected with the negative electrode of the direct current power supply; the switch tube S3The switch tube S7And the switch tube S11The S ends of the capacitors are connected with the point O of the middle point of the capacitor; the switch tube S2End D and the switch tube S3D end of the switch tube S is connected with the D end of the switch tube6End D and the switch tube S7D end of the switch tube S is connected with the D end of the switch tube10End D and the switch tube S11The D end of the N-terminal is connected;
the switch tube S1End S of the switch tube S2And the switch tube S4D terminal of (a) and the inductor LaOne end of the two ends are connected;
the switch tube S5End S of the switch tube S6And the switch tube S8D terminal of (a) and the inductor LbOne end of the two ends are connected;
the switch tube S9End S of the switch tube S10And the switch tube S12D terminal of (a) and the inductor LcAre connected at one end.
4. The topology of any one of claims 1 to 3, wherein the inductor L is arranged in a manner of being neutral-point balanced and three-level grid-connected converteraThe inductor LbThe inductor LcThe inductor LgaThe inductor LgbThe inductor LgcAnd said capacitor CaThe capacitor CbThe capacitor CcConstituting an L C L filter.
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