CN108390572B - Input current waveform optimization topological structure of active third harmonic injection matrix converter - Google Patents
Input current waveform optimization topological structure of active third harmonic injection matrix converter Download PDFInfo
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- 238000002347 injection Methods 0.000 title claims abstract description 43
- 239000007924 injection Substances 0.000 title claims abstract description 43
- 239000011159 matrix material Substances 0.000 title claims abstract description 29
- 238000005457 optimization Methods 0.000 title claims abstract description 7
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 18
- 238000013016 damping Methods 0.000 claims description 21
- 239000003990 capacitor Substances 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 2
- 230000001939 inductive effect Effects 0.000 abstract description 5
- 238000001914 filtration Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 238000004088 simulation Methods 0.000 description 4
- 238000011217 control strategy Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 230000035772 mutation Effects 0.000 description 2
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- 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
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M5/4585—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only having a rectifier with controlled elements
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- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
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- Engineering & Computer Science (AREA)
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- Supply And Distribution Of Alternating Current (AREA)
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Abstract
The invention discloses an input current waveform optimization topological structure of an active third harmonic injection matrix converter, which comprises a three-phase alternating current power supply, an input filter, a voltage selector IVS, a bus filter, a third harmonic injection circuit, a current mode inverter CSI, a three-phase alternating current load and an output filter inductor; the voltage selector comprises a rectification stage and three bidirectional switches, the rectification stage comprises three bridge arms consisting of full-control devices, the third harmonic injection circuit comprises a y bridge arm consisting of the full-control devices and a harmonic injection current filter inductor Ly, and the bus filter is arranged on the bus of the topological structure. The topological structure can effectively inhibit the sector switching distortion of the input current caused by the switching of high-frequency bus current and low-frequency harmonic injection inductive current of the active third harmonic injection matrix converter, and improve the waveform of the input current.
Description
Technical Field
The invention relates to an electric energy conversion device, in particular to a topological structure capable of improving input current waveforms of an active third harmonic injection matrix converter.
Background
The Matrix Converter (MC) is an AC-AC power converter without a large-capacity energy storage element, has the advantages of small size, light weight, high reliability, bidirectional energy flow, sinusoidal input and output, and the like, and is widely researched in the world. The two-stage matrix converter is a sub-class of the matrix converter, has the advantages of simple clamping circuit, easy realization of a current conversion control strategy and the like, but has the limitations of small input power factor angle control range and weak reactive power control capability. In this context, a new matrix converter active third harmonic injection matrix converter (H3IMC) based on active third harmonic injection technology is proposed by researchers, as shown in fig. 1. The active third harmonic injection matrix converter does not need a large-capacity energy storage element, so that most of the advantages of the two-stage matrix converter are inherited, but a harmonic injection circuit contained in the H3IMC can inject expected reactive power into an input power supply, so that the limitation of weak reactive power control capability of the traditional MC is broken through theoretically.
However, the topology shown in fig. 1 has distortion of the input current at the sector switching, and the simulated waveform is shown in fig. 4. This is because at the sector switching, two phases of commutation occur, one phase being bus current and chopped by the inverter, the other phase being harmonic injection circuit filter inductor current, which is mainly low frequency current through inductive filtering. When the bus chopper current and the low-frequency inductor current are switched, because the instantaneous value of the bus chopper current at a converter point is uncertain, current mutation can be generated when the bus chopper current is switched with the low-frequency inductor current, so that an input filter is vibrated, and the input current is distorted.
Disclosure of Invention
The invention aims to provide a topological structure capable of improving the input current waveform of an active third harmonic injection matrix converter, which can effectively inhibit the sector switching distortion of the input current caused by the switching of high-frequency bus current and low-frequency harmonic injection inductive current of the active third harmonic injection matrix converter and improve the input current waveform.
In order to achieve the above purpose, the solution of the invention is:
in order to realize the functions, the invention provides an improved topological structure of an active third harmonic injection matrix converter, which comprises a three-phase alternating current power supply, an input filter, a voltage selector IVS, a bus filter, a third harmonic injection circuit, a current mode inverter CSI, a three-phase alternating current load and an output filter inductor;
the voltage selector comprises a rectification stage and three bidirectional switches, the rectification stage comprises three bridge arms consisting of full-control devices, the third harmonic injection circuit comprises a y bridge arm consisting of full-control devices and a harmonic injection current filter inductor Ly；
The three-phase alternating current power supply is connected to the three-phase input end of the voltage selector through the input filter, the x end and the z end of the voltage selector IVS are connected to the direct current ends p and n of the current mode inverter CSI through the bus filter, the y end of the voltage selector IVS is connected to the bidirectional switch through the third harmonic injection circuit, and the three-phase alternating current load is connected to the three-phase alternating current output end of the current mode inverter CSI through the output filter inductor.
The bus filter comprises two filter inductors Lx、LzTwo damping resistors Rx、RzAnd a filter capacitor Cpn. Filter inductance Lx、LzConnected to the x and z ends of the voltage selector IVS output, respectively connected to the p and n ends of the current-mode inverter CSI DC side, and damping resistor Rx、RzIs connected in parallel with the filter inductor Lx、LzTwo terminals, filter capacitor CpnAnd the direct current is directly bridged across the two ends of the direct current sides p and n of the current-mode inverter CSI.
The input filter includes only three input filter inductors, not an input filter capacitor and a damping resistor.
The voltage selector IVS comprises a rectification stage and three bidirectional switches, wherein the rectification stage comprises three bridge arms formed by fully-controlled devices, each bidirectional switch is formed by two fully-controlled device common-emitter stages, and each fully-controlled device is connected with a body diode in an anti-parallel mode.
The third harmonic injection circuit comprises a y bridge arm consisting of fully-controlled devices and a harmonic injection current filter inductor LyThe y bridge arm is bridged at the two ends of the direct current sides p and n of the current type inverter CSI, and harmonic waves are injected into the current filter inductor LyAnd connecting the y bridge arm and the bidirectional switch.
Has the advantages that:
(1) according to the active third harmonic injection matrix converter topological structure, high-frequency components of bus current are filtered, the problem that an input filter vibrates due to current mutation when the bus high-frequency current and the low-frequency inductive current are switched is solved, and distortion at the switching position of an input current sector is effectively restrained.
(2) According to the active third harmonic injection matrix converter topological structure, due to the fact that filtering is directly carried out on the bus, current ripples are obviously reduced when input current is equal to bus current.
(3) According to the active third harmonic injection matrix converter topological structure, two filter inductors and one filter capacitor on the bus are added, three filter capacitors on the input side are reduced, and the added devices are small in size and weight, so that the size and weight of the system are reduced on the whole.
(4) The active third harmonic injection matrix converter improves the topological structure, and when the damping resistance is increased, the system response is faster without overshoot; when the damping resistor is not added, the damping resistor is still an over-damping system and has stronger stability.
(5) The active third harmonic injection matrix converter improves the topological structure, only needs to modify the positions and the sizes of the inductor and the capacitor, does not need to modify the control strategy of the original topology, and is very simple and effective.
Drawings
FIG. 1 is a prior art active third harmonic injection matrix converter topology;
FIG. 2 is a topological structure (no damping resistor) for improving the input current waveform of the active third harmonic injection matrix converter provided by the present invention;
FIG. 3 is a topological structure (including damping resistors) for improving the input current waveform of an active third harmonic injection matrix converter provided by the present invention;
FIG. 4 is a block diagram of a bi-directional switch used in the present invention;
FIG. 5 is a comparison graph of the input current simulation results of the topology (no damping resistance) provided by the present invention and the original topology;
FIG. 6 is a comparison graph of the dynamic characteristic simulation results of the topological structure provided by the invention when the topological structure has no damping resistance and damping resistance.
Detailed Description
The technical solution and the advantages of the present invention will be described in detail with reference to the accompanying drawings.
The improved topological structure of the active third harmonic injection matrix converter is shown in the attached figures 2 and 3. The three-phase alternating current power supply is connected to the three-phase input end of the voltage selector through the input filter, the x end and the z end of the voltage selector IVS are connected to the direct current ends p and n of the current mode inverter CSI through the bus filter, the y end of the voltage selector IVS is connected to the bidirectional switch through the third harmonic injection circuit, and the three-phase alternating current load is connected to the three-phase alternating current output end of the current mode inverter CSI through the output filter inductor.
The bus filter of fig. 2 comprises two filter inductors Lx、LzAnd a filter capacitor Cpn. Filter inductance Lx、LzRespectively connected to the x and z ends of the voltage selector IVS output, respectively connected to the p and n ends of the DC side of the current-mode inverter CSI, and a filter capacitor CpnAnd the voltage is bridged across the two ends of the direct current sides p and n of the current source inverter CSI. The bus filter designed in this way can directly filter the bus, if L isiI ═ x, z, and CpnSatisfies the following formula:
wherein ω isnFor the bus current harmonic angular frequency (for active third harmonic injection matrix converters, the bus current harmonics are distributed around the inverter switching frequency and multiples thereof), LiI ═ x, z, and CpnThe bus filter inductor and the filter capacitor are respectively arranged, so that the impedance of the bus filter inductor to bus current harmonic waves is far larger than that of the bus filter capacitor, most of high-frequency components of bus current flow to the bus filter capacitor, and few high-frequency components of current flowing to two ends x and z of the voltage selector IVS output. Therefore, the currents of the three terminals x, y and z of the voltage selector IVS are filtered, so that the inversion between two phases at the input side does not cause sudden change of the input current during sector switching, and the sector switching distortion of the input current is fundamentally inhibited. In addition, because the bus is directly filtered, the filtering effect is better than that of filtering the three-phase input current. Fig. 5 is a comparison of the simulation results of the topologies shown in fig. 1 and fig. 2, wherein the input current THD is reduced from 3.37% to 1.34%.
Compared with the topology shown in the attached drawing 1, the topology shown in the attached drawing 2 has the advantages that two inductors and one capacitor on the bus are added, three capacitors on the input side are reduced, the number of devices is not reduced, the added capacitors only play a role in filtering, and the effect of bypassing the bus high-frequency current can be achieved by taking a small capacitor, so that the system size and the weight are reduced.
When no damping resistor exists, the damping coefficient of the system is smaller, and the stability is poorer, so a common passive damping mode of filter design is adopted, and damping resistors are connected in parallel at two ends of a bus filter inductor to enhance the stability of the system. As shown in fig. 3, damping resistor Rx、RzIs connected in parallel with the filter inductor Lx、LzTwo ends. The purpose of enhancing the stability of the system can be achieved by connecting large damping resistors in parallel at two ends of the bus filter inductor, the power consumed by the resistors is small, the passing high-frequency current is little, and the influence on the waveform quality of the input current is very limited. Fig. 6 is a comparison of the results of dynamic property simulations of the topologies shown in fig. 2 and 3.
In the topology shown in fig. 2, the three bidirectional switches are four-quadrant switches, which can pass bidirectional current and block bidirectional voltage. The structure of the bidirectional switch adopted by the invention is shown in figure 4, and each bidirectional switch is formed by connecting two all-controlled devices (including body diodes) in series in a cascode mode. The selection of the bidirectional switch can reduce the number of isolated driving power supplies, simplify the design of a driving circuit and reduce stray inductance of a circuit.
The topology structure shown in fig. 2 only needs to make some modifications to the size and position of the capacitance and inductance, and does not need to modify the control strategy of the original topology. The x, y and z ends of the voltage selector IVS respectively select the maximum term, the intermediate phase and the minimum phase of the input voltage, the harmonic injection circuit achieves the purpose of input current sine and PFC by injecting harmonic into the closed-loop control of the inductive current, and the current type inverter adopts a carrier modulation strategy.
It should be understood that equivalents and modifications of the technical solution and inventive concept thereof may occur to those skilled in the art, and all such modifications and alterations should fall within the scope of the appended claims.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (4)
1. The active third harmonic injection matrix converter input current waveform optimization topological structure comprises a three-phase alternating current power supply, an input filter, a voltage selector (IVS), a bus filter, a third harmonic injection circuit, a current mode inverter (CSI), a three-phase alternating current load and an output filter inductor; the voltage selector comprises a rectification stage and three bidirectional switches, the rectification stage comprises three bridge arms consisting of full-control devices, the third harmonic injection circuit comprises a y bridge arm consisting of full-control devices and a harmonic injection current filter inductor (a)L y) The method is characterized in that: the bus filter is arranged on the bus of the topological structure, and the input filter comprises three input filter inductors;
the bus filter comprises two bus filter inductors (L x、L z) And a filter capacitor (C pn）；
The two bus filter inductors (L x、L z) One end of the two bus filter inductors is respectively connected with the x and z ends of the output of the voltage selector (IVS), and the two bus filter inductors (are)L x、L z) The other end of the filter capacitor is respectively connected with the two ends of the direct current side p and the n of the current-mode inverter (CSI) and the filter capacitor (c)C pn) Across the dc side p, n of the Current Source Inverter (CSI).
2. The active third harmonic injection matrix converter input current waveform optimization topology of claim 1, wherein: the three-phase alternating current power supply is connected to a three-phase input end of the voltage selector through an input filter, and the three-phase input end is respectively connected to one end of each of the three bidirectional switches; the two ends x and z of the voltage selector (IVS) are connected to the direct current ends p and n of the current-mode inverter (CSI) through the bus filter, and the middle point of the y bridge arm is injected with a current filter inductor through harmonic waves (L y) To the three pairsTowards the other end of the switch, a three-phase ac load is connected to a three-phase ac output of a Current Source Inverter (CSI) through an output filter inductor.
3. The active third harmonic injection matrix converter input current waveform optimization topology of claim 2, wherein: the bus filter also comprises two damping resistors (R x、R z) The two damping resistors: (R x、R z) Are respectively connected in parallel with filter inductors (L x、L z) Two ends, namely two ends of each filter inductor are connected with a damping resistor in parallel.
4. The active third harmonic injection matrix converter input current waveform optimization topology of claim 1, wherein:
the voltage selector (IVS) comprises a rectification stage and three bidirectional switches, wherein the rectification stage comprises three bridge arms formed by fully-controlled devices, each bidirectional switch is formed by two fully-controlled device common-emitter stages, and each fully-controlled device is connected with a body diode in an anti-parallel mode.
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| CN112186771B (en) * | 2020-10-09 | 2022-11-25 | 北京航空航天大学 | Electric energy router based on matrix converter and electric energy routing method |
| CN113381621B (en) * | 2021-07-28 | 2022-02-18 | 南京航空航天大学 | Injection current control device of hybrid active third harmonic injection matrix converter |
| CN114865983B (en) * | 2022-06-02 | 2023-04-18 | 南京航空航天大学 | Three-phase alternating current speed regulation system for multiplexing excitation winding |
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