CN112865554A - Single-phase or three-phase alternating current power supply multiplexing type power electronic load device - Google Patents
Single-phase or three-phase alternating current power supply multiplexing type power electronic load device Download PDFInfo
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- CN112865554A CN112865554A CN202110069389.5A CN202110069389A CN112865554A CN 112865554 A CN112865554 A CN 112865554A CN 202110069389 A CN202110069389 A CN 202110069389A CN 112865554 A CN112865554 A CN 112865554A
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/40—Testing power supplies
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/40—Testing power supplies
- G01R31/42—AC power supplies
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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
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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
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
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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
- 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
- H02M7/53—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 using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
- H02M7/53871—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 using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
Abstract
The invention discloses a multiplexing power electronic load device of a single-phase or three-phase alternating current power supply, which comprises a power supply to be tested; the load converter is connected with the power supply to be tested; the direct current capacitor bank is connected with the other end of the load converter, and the midpoint of the direct current capacitor bank is connected with the power supply to be tested through a control switch; the energy feedback converter is connected with the other end of the direct current capacitor bank, and the other end of the energy feedback converter is connected with the side of the power grid; the invention constructs various types of load structures, combines the energy feedback type and single/three-phase alternating current power supply multiplexing type power electronic load technology, and realizes multi-class free switching. The technical problems that power electronic loads in the prior art are used for solving the technical problems of AC/DC rectification, relatively simple functions and the like of single-class alternating current are solved, and the utilization efficiency of equipment devices is improved.
Description
Technical Field
The invention relates to the technical field of application of power electronics in a power system, in particular to a single-phase or three-phase alternating-current power supply multiplexing type power electronic load device.
Background
With the continuous development of modern power electronic technology, various power supplies are popularized and widely used, but various fault problems are generated along with the development of the modern power electronic technology, once the fault problems occur, the fault problems can greatly influence the operation of the whole system, and in serious cases, the fault problems can bring extremely serious influence on industrial production and daily life. Therefore, the test of the power supply is still an indispensable link, the power supply needs to be tested for several hours after being manufactured so as to verify the output characteristic and other characteristics of the power supply, and the experimental result is obtained to check whether the technical index is qualified or not and whether the technical index meets the reliability standard or not, so that the reliable operation of the power supply is guaranteed. Although the power supply can be tested by using the traditional load testing method, the energy is consumed by the load, the energy loss is large, the insulation is damaged due to the rise of the load temperature during the heavy-current work, and the safety cannot be guaranteed. In view of these problems, it is desirable to find a power electronic load device for testing a power supply to replace a conventional resistor box, reduce energy consumption, and feed back the remaining energy to a power grid side through an inverter, so as to realize cyclic utilization of energy.
Most of the designed power electronic load structures are single at present, circuits with several functions cannot be integrated into a unified circuit, a single-phase alternating current power supply and a three-phase alternating current power supply are integrated into the same circuit, single-phase bridge rectification and single-phase half-bridge rectification are integrated into one circuit, single-phase feed energy and three-phase feed energy are integrated into one circuit, and the conduction and the turn-off of different switches are utilized to realize several different functions; and can provide electric energy compensation for the phase with higher load by dynamically analyzing the load distribution on the power grid side.
Disclosure of Invention
This section is for the purpose of summarizing some aspects of embodiments of the invention and to briefly introduce some preferred embodiments. In this section, as well as in the abstract and the title of the invention of this application, simplifications or omissions may be made to avoid obscuring the purpose of the section, the abstract and the title, and such simplifications or omissions are not intended to limit the scope of the invention.
The present invention has been made in view of the above-mentioned problems of the conventional power electronic load device of the single-phase or three-phase ac power multiplexing type.
Therefore, an object of the present invention is to provide a power electronic load device of a single-phase or three-phase ac power multiplexing type.
In order to solve the technical problems, the invention provides the following technical scheme: comprises a power supply to be tested; the load converter is connected with the power supply to be tested; the direct current capacitor bank is connected with the other end of the load converter, and the midpoint of the direct current capacitor bank is connected with the power supply to be tested through a control switch; and the energy feedback converter is connected with the other end of the direct current capacitor bank, and the other end of the energy feedback converter is connected with the power grid side.
As a preferable aspect of the power electronic load device of the single-phase or three-phase ac power supply multiplexing type of the present invention, wherein: the load converter is an AC/DC type three-phase converter and comprises a line inlet reactor group, a first bridge arm, a second bridge arm and a third bridge arm, wherein the first bridge arm, the second bridge arm and the third bridge arm are connected with the line inlet reactor group; the wire inlet reactor group comprises a first wire inlet reactor, a second wire inlet reactor and a third wire inlet reactor; one end of the first inlet wire reactor is connected with the power source to be tested, the other end of the first inlet wire reactor is connected with the midpoint of the first bridge arm through a first switch, one end of the second inlet wire reactor is connected with the power source to be tested, the other end of the second inlet wire reactor is connected with the midpoint of the second bridge arm through a second switch, the third inlet wire reactor is connected with one end of the third inlet wire reactor and the midpoint of the third bridge arm through a third switch.
As a preferable aspect of the power electronic load device of the single-phase or three-phase ac power supply multiplexing type of the present invention, wherein: the load transverter passes through third bridge arm both ends with direct current capacitor bank connects, direct current capacitor bank include first direct current capacitor and with the second condenser of first direct current capacitor series connection, direct current capacitor bank one side with the load transverter is connected, the other end with it connects to present can the transverter.
As a preferable aspect of the power electronic load device of the single-phase or three-phase ac power supply multiplexing type of the present invention, wherein: the energy-feedback converter comprises a fourth bridge arm connected with the direct-current capacitor bank, a fifth bridge arm connected with the fourth bridge arm in parallel, a sixth bridge arm connected with the fifth bridge arm in parallel and an outgoing line reactor bank, wherein the outgoing line reactor bank comprises a first outgoing line reactor, a second reactor and a third reactor, the first outgoing line reactor is connected with the fourth bridge arm through a fourth switch, the second outgoing line reactor is connected with the fifth bridge arm through a fifth switch, and the third outgoing line reactor is connected with the sixth bridge arm through a sixth switch; the outgoing reactor group is connected with the power grid side; the power grid side is provided with a seventh switch, an eighth switch and a ninth switch, one end of the seventh switch is connected with the power grid side, the other end of the seventh switch is connected to the fourth switch and the first wire outlet reactor, one end of the eighth switch is connected with the power grid side, the other end of the eighth switch is connected to the fifth switch and the second wire outlet reactor, one end of the ninth switch is connected with the power grid side, and the other end of the ninth switch is connected to the sixth switch and the second wire outlet reactor.
As a preferable aspect of the power electronic load device of the single-phase or three-phase ac power supply multiplexing type of the present invention, wherein: when the control switch, the first switch, the second switch, the third switch, the fourth switch, the fifth switch and the sixth switch are turned on, the seventh switch, the eighth switch and the ninth switch are turned off, and the power source to be tested is a three-phase alternating current power source; the load converter and the energy-fed converter are an AC/DC type three-phase load converter and a DC/AC type three-phase energy-fed converter.
As a preferable aspect of the power electronic load device of the single-phase or three-phase ac power supply multiplexing type of the present invention, wherein: when the control switch, the first switch, the fourth switch, the fifth switch and the sixth switch are closed and the other switches are disconnected, the power supply to be tested is a single-phase alternating-current power supply, and the power supply to be tested is connected with any one of the first incoming line reactor, the second incoming line reactor and the third incoming line reactor; the load converter and the energy-fed converter are AC/DC type single-phase half-bridge load converters and DC/AC type three-phase energy-fed converters.
As a preferable aspect of the power electronic load device of the single-phase or three-phase ac power supply multiplexing type of the present invention, wherein: when the first switch, the second switch, the fourth switch, the fifth switch and the sixth switch are turned off, the other switches are turned on, the power supply to be tested is a single-phase alternating-current power supply, and the power supply to be tested is connected with any two groups of reactors in the first incoming line reactor, the second incoming line reactor and the third incoming line reactor; the load converter and the energy-fed converter are AC/DC type single-phase full-bridge load converters and DC/AC type three-phase energy-fed converters.
As a preferable aspect of the power electronic load device of the single-phase or three-phase ac power supply multiplexing type of the present invention, wherein: when the control switch, the first switch, the second switch, the third switch, the fourth switch and the seventh switch are closed, and the other switches are opened; when the power source to be tested is a three-phase alternating current power source, the load converter and the energy feed converter are an AC/DC type three-phase load converter and a DC/AC type single-phase energy feed converter.
As a preferable aspect of the power electronic load device of the single-phase or three-phase ac power supply multiplexing type of the present invention, wherein: when the control switch, the first switch, the fourth switch and the seventh switch are switched on, the other switches are switched off; the power supply to be tested is a single-phase alternating current power supply and is connected to the left side of any incoming line reactor, and the load converter and the energy feed converter are an AC/DC type single-phase half-bridge load converter and a DC/AC type single-phase energy feed converter.
As a preferable aspect of the power electronic load device of the single-phase or three-phase ac power supply multiplexing type of the present invention, wherein: the first switch, the second switch, the fourth switch and the seventh switch are closed, the other switches are disconnected, the power source to be tested is a single-phase alternating-current power source, and the power source to be tested is connected with any two groups of reactors in the first incoming line reactor, the second incoming line reactor and the third incoming line reactor; the load converter and the energy-fed converter are an AC/DC type single-phase full-bridge load converter and a DC/AC type single-phase energy-fed converter.
The invention has the beneficial effects that: the invention constructs various load structures, combines the energy feedback type and single/three-phase alternating current power supply multiplexing type power electronic load technology, and cracks the novel load structure into circuit systems with different functions by controlling the on and off of a power switch device according to the requirements of different users, thereby realizing the free switching under the three-phase alternating current power supply test three-phase energy feedback, the three-phase alternating current power supply test single-phase energy feedback, the single-phase alternating current power supply test three-phase energy feedback and the single-phase alternating current power supply test single-phase energy feedback respectively. The technical problems that power electronic loads in the prior art are used for solving the technical problems of AC/DC rectification, relatively simple functions and the like of single-class alternating current are solved, and the utilization efficiency of equipment devices is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise. Wherein:
FIG. 1 is a schematic diagram of the main structure of the present invention;
fig. 2 is an AC/DC type three-phase load converter and a DC/AC type three-phase energy-fed converter of the present invention;
FIG. 3 is a schematic diagram of an AC/DC type single phase half bridge load converter and a DC/AC type three phase energy feed converter of the present invention;
FIG. 4 is an AC/DC type single phase full bridge load converter and a DC/AC type three phase energy feed converter of the present invention;
fig. 5 is an AC/DC type three-phase load converter and a DC/AC type single-phase energy-fed converter of the present invention;
FIG. 6 is an AC/DC type single phase half bridge load converter and a DC/AC type single phase energy feed converter of the present invention;
FIG. 7 is an AC/DC type single phase full bridge load converter and a DC/AC type single phase energy feed converter of the present invention;
FIG. 8 is a three-phase current waveform of the power supply side to be tested according to the present invention;
FIG. 9 is a three-phase voltage waveform of the power supply under test according to the present invention;
fig. 10 is a terminal voltage of two dc capacitors according to the present invention;
fig. 11 shows three-phase current and voltage at the energy feedback side (before voltage reduction) according to the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
Furthermore, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
Furthermore, the present invention is described in detail with reference to the drawings, and in the detailed description of the embodiments of the present invention, the cross-sectional view illustrating the structure of the device is not enlarged partially according to the general scale for convenience of illustration, and the drawings are only exemplary and should not be construed as limiting the scope of the present invention. In addition, the three-dimensional dimensions of length, width and depth should be included in the actual fabrication.
Example 1
Referring to fig. 1, there is provided an overall structural schematic diagram of a power electronic load device of a single-phase or three-phase alternating-current power supply multiplexing type, as shown in fig. 1, the power electronic load device of a single-phase or three-phase alternating-current power supply multiplexing type includes a power supply 100 to be tested, the power supply 100 to be tested is connected to a line feeding reactor set 201 on a load converter 200, and a dc capacitor set 300 connected to the load converter 200, a midpoint of the dc capacitor set 300 is connected to the power supply 100 to be tested through a control switch 301, the other side of the dc capacitor set 300 is connected to an energy feeding converter 400, and then the energy feeding converter 400 is connected to a grid side 500, where the grid side 500 is a three-phase end.
Specifically, the load converter 200 is an AC/DC type three-phase converter, and includes an incoming line reactor group 201, and a first bridge arm 202, a second bridge arm 203, and a third bridge arm 204 connected to the incoming line reactor group 201; the incoming line reactor group 201 comprises a first incoming line reactor 201a, a second incoming line reactor 201b and a third incoming line reactor 201 c; one end of a first incoming line reactor 201a is connected with a power supply 100 to be tested, the other end of the first incoming line reactor 201a is connected with the midpoint of a first bridge arm 202 through a first switch 202a, one end of a second incoming line reactor 201b is connected with the power supply 100 to be tested, the other end of the second incoming line reactor 201b is connected with the midpoint of a second bridge arm 203 through a second switch 203a, a third incoming line reactor 201c is connected with one end of the third incoming line reactor 100 to be tested, and the other end of the third incoming line reactor is connected with the midpoint of a.
Further, the load converter 200 is connected to the dc capacitor bank 300 through the third bridge arm 204, the dc capacitor bank 300 includes a first dc capacitor 302 and a second capacitor 303 connected in series with the first dc capacitor 302, one side of the dc capacitor bank 300 is connected to the load converter 200, and the other side is connected to the energy feedback converter 300.
Further, the energy feedback converter 400 includes a fourth leg 401 connected to the dc capacitor bank 300, a fifth leg 402 connected to the fourth leg 401 in parallel, a sixth leg 403 connected to the fifth leg 402 in parallel, and an outgoing line reactor group 404, where the outgoing line reactor group 404 includes a first outgoing line reactor 404a, a second reactor 404b, and a third reactor 404c, where the first outgoing line reactor 404a is connected to the fourth leg 401 through a fourth switch 401a, the second outgoing line reactor 404b is connected to the fifth leg 402 through a fifth switch 402a, and the third outgoing line reactor 404c is connected to the sixth leg 403a through a sixth switch 403 a; the outgoing reactor bank 404 is connected to the grid side 500; the grid side 500 is provided with a seventh switch 501, an eighth switch 502 and a ninth switch 503, one end of the seventh switch 501 is connected with the grid side 500, the other end of the seventh switch is connected with the fourth switch 401a and the first outgoing line reactor 404a, one end of the eighth switch 502 is connected with the grid side 500, the other end of the eighth switch is connected with the fifth switch 402a and the second outgoing line reactor 404b, one end of the ninth switch 503 is connected with the grid side 500, and the other end of the ninth switch 503 is connected with the sixth switch 403a and the second outgoing line reactor 404 c.
It should be noted that each bridge arm is composed of power switches of an upper anti-parallel diode and a lower anti-parallel diode which are connected in series, and the bridge arms are connected in parallel.
When the control switch 301, the first switch 202a, the second switch 203a, the third switch 204a, the fourth switch 401a, the fifth switch 402a and the sixth switch 403a are closed, the seventh switch 501, the eighth switch 502 and the ninth switch 503 are opened, and the power supply 100 to be tested is a three-phase alternating current power supply; the load converter 200 and the energy feeding converter 400 are an AC/DC type three-phase load converter and a DC/AC type three-phase energy feeding converter.
The specific main circuit diagram is shown in fig. 2, which is a schematic structural diagram of the AC/DC type three-phase load converter and the DC/AC type three-phase energy-fed converter of the present invention. Three phases of a three-phase alternating-current power supply to be detected respectively pass through the middle points of the incoming line reactors L1, L2 and L3 and power switching devices Q1 and Q4, the middle points of Q3 and Q6 and the middle points of Q5 and Q2, the power switching devices Q1, Q3 and Q5 are arranged on an upper bridge arm, and the power switching devices Q2, Q4 and Q6 are arranged on a lower bridge arm; the direct current capacitors C1 and C2 are connected in parallel at the direct current sides of the AC/DC type load converter and the DC/AC type energy feed converter, the middle points of C1 and C2 are connected with the neutral point of the tested three-phase alternating current power supply, and the energy feed converter is connected with the power grid side through outlet line reactors L4, L5 and L6; the power switches Q7, Q9 and Q11 are arranged on the upper bridge arm, and the power switches Q8, Q10 and Q12 are arranged on the lower bridge arm; the system can realize that the residual electric energy is returned to the power grid through the load converter and the energy feed converter.
Example 2
Referring to fig. 3, this embodiment is different from the first embodiment in that: when the control switch 301, the first switch 202a, the fourth switch 401a, the fifth switch 402a and the sixth switch 403a are closed, the rest switches are open, the power supply 100 to be tested is a single-phase alternating-current power supply, and the power supply 100 to be tested is connected with any one of the first incoming line reactor 201a, the second incoming line reactor 201b and the third incoming line reactor 201 c; the load converter 200 and the energy-fed converter 400 are an AC/DC type single-phase half-bridge load converter and a DC/AC type three-phase energy-fed converter.
The specific main circuit diagram is shown in fig. 3, which is a schematic structural diagram of an AC/DC single-phase half-bridge load converter and a DC/AC three-phase energy-fed converter according to the present invention. Two ends of a single-phase alternating current power supply to be measured are respectively connected to one end of an incoming line reactor L1 and the midpoint of capacitors C1 and C2, and the other end of L1 is connected with the midpoint of power switching devices Q1 and Q4. The power switch device Q1 is arranged on the upper bridge arm, and the power switch device Q4 is arranged on the lower bridge arm. The direct current capacitors C1 and C2 connected in series with each other are connected in parallel on the direct current side of the AC/DC type load converter and the DC/AC type energy feed converter. The energy-feeding-side converter is connected with the power grid side through outlet reactors L4, L5 and L6. The power switches Q7, Q9 and Q11 are in the upper arm, and the power switches Q8, Q10 and Q12 are in the lower arm. The system can realize that the residual electric energy is returned to the power grid through the load converter and the energy feed converter.
Example 3
Referring to fig. 4, this embodiment differs from the above embodiment in that: when the first switch 202a, the second switch 203a, the fourth switch 401a, the fifth switch 402a and the sixth switch 403a are opened, the other switches are closed, the power supply 100 to be tested is a single-phase alternating-current power supply, and the power supply 100 to be tested is connected with any two groups of reactors in the first incoming line reactor 201a, the second incoming line reactor 201b and the third incoming line reactor 201 c; the load converter 200 and the energy-fed converter 400 are an AC/DC type single-phase full-bridge load converter and a DC/AC type three-phase energy-fed converter.
The specific main circuit diagram is shown in fig. 4, which is a schematic structural diagram of the AC/DC single-phase full-bridge load converter and the DC/AC three-phase energy-fed converter according to the present invention. Two ends of a single-phase alternating current power supply to be measured are respectively connected to one ends of the incoming line reactors L1 and L2, and the other ends of L1 and L2 are connected with the middle points of the power switching devices Q1 and Q4 and the middle points of Q3 and Q6; the power switching devices Q1 and Q3 are arranged on the upper bridge arm, and the power switching devices Q4 and Q6 are arranged on the lower bridge arm; the direct current capacitors C1 and C2 are connected in parallel on the direct current side of the AC/DC type load converter and the DC/AC type energy feed converter; the energy-feed side converter is connected with the power grid side through outlet reactors L4, L5 and L6; the power switches Q7, Q9 and Q11 are arranged on the upper bridge arm, and the power switches Q8, Q10 and Q12 are arranged on the lower bridge arm; the system can realize that the residual electric energy is returned to the power grid through the load converter and the energy feed converter.
Example 4
Referring to fig. 5, this embodiment differs from the above embodiment in that: when the control switch 301, the first switch 202a, the second switch 203a, the third switch 204a, the fourth switch 401a, and the seventh switch 501 are closed, and the remaining switches are open; when the power source 100 to be tested is a three-phase AC power source, the load converter 200 and the energy-feeding converter 400 are AC/DC type three-phase load converters and DC/AC type single-phase energy-feeding converters.
The specific main circuit diagram is shown in fig. 5, which is a schematic structural diagram of an AC/DC type three-phase load converter and a DC/AC type single-phase energy-fed converter according to the present invention; three phases of a three-phase alternating current power supply to be detected respectively pass through the neutral points of the incoming line reactors L1, L2 and L3 and the power switching devices Q1 and Q4, the neutral points of Q3 and Q6 and the neutral points of Q5 and Q2; the power switches Q1, Q3 and Q5 are arranged on the upper bridge arm, and the power switches Q2, Q4 and Q6 are arranged on the lower bridge arm; the direct current capacitors C1 and C2 are connected in parallel on the direct current sides of the AC/DC type load converter and the DC/AC type energy feed converter, and the middle points of C1 and C2 are connected with the neutral point of the tested three-phase alternating current power supply; through the load balance adjustment of the power grid, the device can feed back any phase of the power grid side, and in the embodiment, the current converter of the adjusting energy feed side is connected with A of the power grid side through an outlet electric reactor L4; the power switching devices Q7 and Q9 are arranged on the upper bridge arm, and the power switching devices Q10 and Q12 are arranged on the lower bridge arm; the system can realize that the residual electric energy is returned to the power grid through the load converter and the energy feed converter.
Example 5
Referring to fig. 6, this embodiment differs from the above embodiment in that: when the control switch 301, the first switch 202a, the fourth switch 401a and the seventh switch 501 are closed, the other switches are opened; when the power supply 100 to be tested is a single-phase alternating current power supply and is connected to the left side of any incoming line reactor, the load converter 200 and the energy-fed converter 400 are an AC/DC type single-phase half-bridge load converter and a DC/AC type single-phase energy-fed converter.
The specific main circuit diagram is shown in fig. 6, which is a schematic structural diagram of the AC/DC type single-phase half-bridge load converter and the DC/AC type single-phase energy-fed converter according to the present invention. Two ends of a single-phase alternating current power supply to be measured are respectively connected to one end of an incoming line reactor L1 and the midpoint of capacitors C1 and C2, and the other end of L1 is connected with the midpoint of power switching devices Q1 and Q4. The power switch device Q1 is arranged on the upper bridge arm, and the power switch device Q4 is arranged on the lower bridge arm. The direct current capacitors C1 and C2 connected in series with each other are connected in parallel on the direct current side of the AC/DC type load converter and the DC/AC type energy feed converter. By means of the network load balancing regulation, the device can feed back any phase on the network side, in this case the regulating energy feed side converter is connected to a on the network side through an outgoing line reactor L4. The power switching devices Q7 and Q9 are arranged on the upper bridge arm, and the power switching devices Q10 and Q12 are arranged on the lower bridge arm; the system can realize that the residual electric energy is returned to the power grid through the load converter and the energy feed converter.
Example 6
Referring to fig. 7, this embodiment differs from the above embodiment in that: when the first switch 202a, the second switch 203a, the fourth switch 401a and the seventh switch 501 are closed, the rest switches are opened, the power supply 101 to be tested is a single-phase alternating-current power supply, and the power supply 100 to be tested is connected with any two groups of reactors in the first incoming line reactor 201a, the second incoming line reactor 201b and the third incoming line reactor 201 c; the load converter 200 and the energy-fed converter 400 are an AC/DC type single-phase full-bridge load converter and a DC/AC type single-phase energy-fed converter.
The specific main circuit diagram is shown in fig. 7, which is a schematic structural diagram of the AC/DC single-phase full-bridge load converter and the DC/AC single-phase energy-fed converter according to the present invention. Two ends of a single-phase alternating current power supply to be measured are respectively connected to one ends of the incoming line reactors L1 and L2, and the other ends of L1 and L2 are connected with the middle points of the power switches Q1 and Q4 and the middle points of Q3 and Q6. The power switching devices Q1 and Q3 are arranged on the upper bridge arm, and the power switching devices Q4 and Q6 are arranged on the lower bridge arm; the direct current capacitors C1 and C2 are connected in parallel on the direct current side of the AC/DC type load converter and the DC/AC type energy feed converter; through the load balance adjustment of the power grid, the device can feed back any phase of the power grid side, and in the embodiment, the current converter of the adjusting energy feed side is connected with A of the power grid side through an outlet electric reactor L4; the power switching devices Q7 and Q9 are arranged on the upper bridge arm, and the power switching devices Q10 and Q12 are arranged on the lower bridge arm; the system can realize that the residual electric energy is returned to the power grid through the load converter and the energy feed converter.
Example 7
Referring to fig. 8 to 11, the embodiment is a three-phase power supply test, i.e., a three-phase energy feedback simulation experiment, according to the invention; the simulation test shows that a three-phase power supply is fed back to a power grid end through an outgoing line reactor and an isolation transformer after being tested at a load simulation side, the tested three-phase power supply is a 220V three-phase power supply, the internal impedance is 0.1 omega, the reactance value of the incoming line reactor is 8mH, the reactance value of the outgoing line reactor is 1mH, the capacitance values of two direct current capacitors are 2000 muF, and the simulation time is 0.2 s.
In fig. 8, the abscissa is time t (unit: s), the ordinate is line current I (unit: a), and IA, IB, and IC correspond to three phases of three or two currents respectively; in FIG. 9, the abscissa is time t (unit: s), the ordinate is phase voltage U (unit: V), UA, UB, UC correspond to the three-phase voltage of the measured power supply respectively; in fig. 10, the abscissa is time t (unit: s) and the ordinate is voltage U (unit: V), where U1 and U2 correspond to the terminal voltages of the first dc capacitor 302 and the second dc capacitor 303, respectively; in fig. 11, the upper half is represented by three-phase current at the energy feedback side, the abscissa is time t (unit: s), and the ordinate is line current I (unit: a); the lower part of the table is three-phase voltage of an energy feedback side, the abscissa is time t (unit: s), and the ordinate is phase voltage U (unit: V).
As shown in experimental results, the invention has certain stability, can deal with most of the situations required by the power electronic load device, and has strong applicability.
It is important to note that the construction and arrangement of the present application as shown in the various exemplary embodiments is illustrative only. Although only a few embodiments have been described in detail in this disclosure, those skilled in the art who review this disclosure will readily appreciate that many modifications are possible (e.g., variations in sizes, dimensions, structures, shapes and proportions of the various elements, values of parameters (e.g., temperatures, pressures, etc.), mounting arrangements, use of materials, colors, orientations, etc.) without materially departing from the novel teachings and advantages of the subject matter recited in this application. For example, elements shown as integrally formed may be constructed of multiple parts or elements, the position of elements may be reversed or otherwise varied, and the nature or number of discrete elements or positions may be altered or varied. Accordingly, all such modifications are intended to be included within the scope of this invention. The order or sequence of any process or method steps may be varied or re-sequenced according to alternative embodiments. In the claims, any means-plus-function clause is intended to cover the structures described herein as performing the recited function and not only structural equivalents but also equivalent structures. Other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the exemplary embodiments without departing from the scope of the present inventions. Therefore, the present invention is not limited to a particular embodiment, but extends to various modifications that nevertheless fall within the scope of the appended claims.
Moreover, in an effort to provide a concise description of the exemplary embodiments, all features of an actual implementation may not be described (i.e., those unrelated to the presently contemplated best mode of carrying out the invention, or those unrelated to enabling the invention).
It should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort might be complex and time consuming, but would nevertheless be a routine undertaking of design, fabrication, and manufacture for those of ordinary skill having the benefit of this disclosure, without undue experimentation.
It should be noted that the above-mentioned embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (10)
1. A power electronic load device of a single-phase or three-phase alternating-current power supply multiplexing type is characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
a power supply (100) to be tested;
the load converter (200), one side of the load converter (200) is connected with the power supply (100) to be tested; and the number of the first and second groups,
the direct current capacitor bank (300), the direct current capacitor bank (300) is connected with the other end of the load converter (200), and the midpoint of the direct current capacitor bank (300) is connected with the power supply (100) to be tested through a control switch (301); and the number of the first and second groups,
the energy feedback converter (400), the energy feedback converter (400) is connected with the other end of the direct current capacitor bank (300), and the other end of the energy feedback converter (400) is connected with the power grid side (500).
2. A power electronic load device of the single-phase or three-phase alternating-current power multiplexing type as claimed in claim 1, wherein: the load converter (200) is an AC/DC type three-phase converter and comprises a line inlet reactor group (201), and a first bridge arm (202), a second bridge arm (203) and a third bridge arm (204) which are connected with the line inlet reactor group (201); the incoming line reactor group (201) comprises a first incoming line reactor (201a), a second incoming line reactor (201b) and a third incoming line reactor (201 c); one end of the first incoming line reactor (201a) is connected with the power supply (100) to be tested, the other end of the first incoming line reactor (201a) is connected with the midpoint of the first bridge arm (202) through a first switch (202a), one end of the second incoming line reactor (201b) is connected with the power supply (100) to be tested, the other end of the second incoming line reactor (201b) is connected with the midpoint of the second bridge arm (203) through a second switch (203a), one end of the third incoming line reactor (201c) is connected with the power supply (100) to be tested, and the other end of the third incoming line reactor (201c) is connected with the midpoint of the third bridge arm (204) through a third.
3. A power electronic load device of the single-phase or three-phase alternating-current power multiplexing type as claimed in claim 2, wherein: the load converter (200) is connected with the direct current capacitor bank (300) through the two ends of the third bridge arm (204), the direct current capacitor bank (300) comprises a first direct current capacitor (302) and a second capacitor (303) connected with the first direct current capacitor (302) in series, one side of the direct current capacitor bank (300) is connected with the load converter (200), and the other end of the direct current capacitor bank is connected with the energy feedback converter (300).
4. A power electronic load device of the single-phase or three-phase ac power multiplexing type as claimed in claim 3, wherein: the energy-regenerative converter (400) comprises a fourth bridge arm (401) connected with the direct-current capacitor bank (300), a fifth bridge arm (402) connected with the fourth bridge arm (401) in parallel, a sixth bridge arm (403) connected with the fifth bridge arm (402) in parallel and an outgoing line reactor bank (404), wherein the outgoing line reactor bank (404) comprises a first outgoing line reactor (404a), a second reactor (404b) and a third reactor (404c), the first outgoing line reactor (404a) is connected with the fourth bridge arm (401) through a fourth switch (401a), the second outgoing line reactor (404b) is connected with the fifth bridge arm (402) through a fifth switch (402a), and the third outgoing line reactor (404c) is connected with the sixth bridge arm (403) through a sixth switch (403 a); the outgoing reactor group (404) is connected to the grid side (500); the power grid side (500) is provided with a seventh switch (501), an eighth switch (502) and a ninth switch (503), one end of the seventh switch (501) is connected with the power grid side (500), the other end of the seventh switch (501) is connected to the fourth switch (401a) and the first wire outlet reactor (404a), one end of the eighth switch (502) is connected with the power grid side (500), the other end of the eighth switch is connected to the fifth switch (402a) and the second wire outlet reactor (404b), one end of the ninth switch (503) is connected with the power grid side (500), and the other end of the ninth switch is connected to the sixth switch (403a) and the second wire outlet reactor (404 c).
5. The power electronic load device of the single-phase or three-phase alternating-current power supply multiplexing type as claimed in any one of claims 1 to 4, wherein: when the control switch (301), the first switch (202a), the second switch (203a), the third switch (204a) and the fourth switch (401a), the fifth switch (402a) and the sixth switch (403a) are closed, the seventh switch (501), the eighth switch (502) and the ninth switch (503) are open, and the power supply under test (100) is a three-phase alternating current power supply; the load converter (200) and the energy-fed converter (400) are an AC/DC type three-phase load converter and a DC/AC type three-phase energy-fed converter.
6. A power electronic load device of the single-phase or three-phase AC power multiplexing type as claimed in claim 5, wherein: when the control switch (301), the first switch (202a), the fourth switch (401a), the fifth switch (402a) and the sixth switch (403a) are closed and the other switches are open, the power supply (100) to be tested is a single-phase alternating-current power supply, and the power supply (100) to be tested is connected with any one of the first incoming line reactor (201a), the second incoming line reactor (201b) and the third incoming line reactor (201 c); the load converter (200) and the energy-fed converter (400) are an AC/DC type single-phase half-bridge load converter and a DC/AC type three-phase energy-fed converter.
7. A power electronic load device of the single-phase or three-phase ac power multiplexing type as claimed in claim 6, wherein: when the first switch (202a), the second switch (203a), the fourth switch (401a), the fifth switch (402a) and the sixth switch (403a) are opened, the other switches are closed, the power supply (100) to be tested is a single-phase alternating-current power supply, and the power supply (100) to be tested is connected with any two groups of reactors of the first incoming line reactor (201a), the second incoming line reactor (201b) and the third incoming line reactor (201 c); the load converter (200) and the energy-fed converter (400) are an AC/DC type single-phase full-bridge load converter and a DC/AC type three-phase energy-fed converter.
8. A power electronic load device of the single-phase or three-phase ac power multiplexing type as claimed in claim 7, wherein: when the control switch (301), the first switch (202a), the second switch (203a), the third switch (204a), the fourth switch (401a) and the seventh switch (501) are closed, and the rest of the switches are open; when the power supply (100) to be tested is a three-phase alternating current power supply, the load converter (200) and the energy feed converter (400) are an AC/DC type three-phase load converter and a DC/AC type single-phase energy feed converter.
9. A power electronic load device of the single-phase or three-phase ac power multiplexing type as claimed in claim 8, wherein: when the control switch (301), the first switch (202a), the fourth switch (401a) and the seventh switch (501) are closed, the rest switches are opened; the power supply (100) to be tested is a single-phase alternating current power supply and is connected to the left side of any incoming line reactor, and the load converter (200) and the energy feed converter (400) are an AC/DC type single-phase half-bridge load converter and a DC/AC type single-phase energy feed converter.
10. A power electronic load device of the single-phase or three-phase alternating-current power multiplexing type as claimed in claim 9, wherein: the first switch (202a), the second switch (203a), the fourth switch (401a) and the seventh switch (501) are closed, the other switches are opened, the power supply (101) to be tested is a single-phase alternating-current power supply, and when the power supply (100) to be tested is connected with any two groups of reactors in the first incoming line reactor (201a), the second incoming line reactor (201b) and the third incoming line reactor (201 c); the load converter (200) and the energy-fed converter (400) are an AC/DC type single-phase full-bridge load converter and a DC/AC type single-phase energy-fed converter.
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| CN202110069389.5A CN112865554A (en) | 2021-01-19 | 2021-01-19 | Single-phase or three-phase alternating current power supply multiplexing type power electronic load device |
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| CN202110069389.5A CN112865554A (en) | 2021-01-19 | 2021-01-19 | Single-phase or three-phase alternating current power supply multiplexing type power electronic load device |
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