CN113452240B - Single-stage dual-mode three-port power electronic converter - Google Patents

Single-stage dual-mode three-port power electronic converter Download PDF

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CN113452240B
CN113452240B CN202110745214.1A CN202110745214A CN113452240B CN 113452240 B CN113452240 B CN 113452240B CN 202110745214 A CN202110745214 A CN 202110745214A CN 113452240 B CN113452240 B CN 113452240B
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converter
phase
bridge arm
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CN113452240A (en
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王涛
梁富宽
谷文龙
李山
杨磊
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Chongqing University of Technology
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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
    • H02M1/10—Arrangements incorporating converting means for enabling loads to be operated at will from different kinds of power supplies, e.g. from ac or dc
    • 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
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac 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
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac 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
    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators

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Abstract

The invention relates to a single-stage dual-mode three-port power electronic converter, and belongs to the field of electronic devices. The single-stage dual-mode three-port power electronic converter comprises a direct-current side filter capacitor, four switching devices, two alternating-current side filter inductors, two alternating-current side filter capacitors and three output ports; the single-stage dual-mode three-port power electronic converter with simple topology and low cost can simultaneously output one path of direct current and one path of alternating current of different voltage grades or simultaneously output three paths of direct current electric energy of different voltage grades under the condition of only using one basic topology, has a simple and easy modulation method, and solves the problems of complex topology, high cost and low power density of the conventional multi-port power electronic converter.

Description

Single-stage dual-mode three-port power electronic converter
Technical Field
The invention belongs to the field of electronic devices, and relates to a single-stage dual-mode three-port power electronic converter.
Background
With the access of electric energy such as renewable energy power generation devices and energy storage equipment and the diversification of the demand of electric equipment, the traditional electric energy conversion equipment cannot meet the requirement of the diversity of power supply forms, so that the multi-port power electronic converter is developed at the same time and can provide different voltage levels and different types of electric energy (direct current and alternating current) for loads. A multi-port power electronic converter refers to a power electronic transformer having multiple ports, and generally has at least ac and dc output ports. As a device capable of realizing multi-voltage level and connecting with an alternating current and direct current hybrid distributed energy source, research on the topology design and related control strategies of a multi-port power electronic transformer is still under development. The main ideas of the design of the multi-port power electronic converter at present are as follows: one or more basic power electronic topologies are connected in parallel or in cascade to obtain multiple paths of direct current and alternating current with different voltage levels, the schemes can output required electric energy and also can ensure the quality of the output electric energy, but because the combination of a multi-stage topology and multiple types of converter topologies is adopted, the size and the cost of the converter are increased, the power density is lower, and a more complex control strategy is required.
Disclosure of Invention
In view of the above, the present invention provides a single-stage dual-mode three-port power electronic converter. In order to achieve the purpose, the invention provides the following technical scheme:
the single-stage dual-mode three-port power electronic converter comprises a direct-current side filter capacitor, four switching devices, two alternating-current side filter inductors, two alternating-current side filter capacitors and three output ports;
the direct current power supply is connected in parallel with a topology formed by four switching devices after passing through a direct current side filter capacitor, and the connection mode of the four switching devices is as follows: the first switching device and the second switching device are connected in series to form an a-phase bridge arm, the third switching device and the fourth switching device are connected in series to form a b-phase bridge arm, and the midpoint of the a-phase bridge arm and the AC side filter inductor L1Connected in series to form a terminal 1; b-phase bridge arm midpoint and AC side filter inductor L2Connected in series to form a terminal 2; a terminal 3 is formed by the negative electrode of the filter capacitor at the direct current side; an AC side filter capacitor C is connected in parallel between the terminal 1 and the terminal 31An AC side filter capacitor C is connected in parallel between the terminal 2 and the terminal 32(ii) a The terminals 1 and 2 constitute output ports 12, the terminals 2 and 3 constitute output ports 23, and the terminals 1 and 3 constitute output ports 13.
Optionally, the switching state of the bridge arm is a binary function SiI ═ a, b, where Si1 denotes a switching tube T corresponding to the i-phase armi1Conduction, S i0 represents the switching tube T of the corresponding i-phase bridge armi2Conducting;
when the switch state of the i-phase bridge arm is 1, the bridge arm outputs voltage vi＝Vdc；
When the switch state of the i-phase bridge arm is 0, the bridge arm outputs voltage vi＝0。
Optionally, the V1Voltage, V, output for a-phase bridge arm2The output voltage V of the converter port 12 being the voltage output by the b-phase bridge arm12Equal to the subtraction of the voltages of the two-phase bridge arms; the output voltage of the converter is represented as:
V12＝V1-V2
the output conditions of the converter under all possible switching sequences are:
when the switch state is (11), the output voltages of the port 12, the port 13 and the port 23 of the converter are 0 and V respectivelydcAnd Vdc；
When the switch state is (00), the output voltages of the port 12, the port 13 and the port 23 of the converter are 0, 0 and 0 respectively;
when the switch state is (10), the output voltages of the port 12, the port 13 and the port 23 of the converter are respectively Vdc、VdcAnd 0;
when the switch state is (01), the output voltages of the port 12, the port 13 and the port 23 of the converter are respectively-V dc0 and Vdc。
Optionally, the output voltage V of the i-phase bridge armiThe expression of (a) is:
Figure BDA0003144150030000021
the output voltage expression of the converter port 12 is expressed as:
Figure BDA0003144150030000022
defining the time that the i-phase bridge arm is in the state 1 as the duty ratio Di，DiThe expression of (a) is as follows:
Figure BDA0003144150030000023
obtaining the relation among the direct current input voltage, the duty ratio and the alternating current side output:
Figure BDA0003144150030000024
if the converter is aimed at outputting a sinusoidal AC voltage, a reference signal V is setref＝Vmcos (θ); definition keyMaking an index m, representing the voltage V on the DC side of the converterdcThe amplitude of the normalized output voltage, and m ═ Vm/VdcThen order vmGiven mcos (θ), the equation becomes:
Figure BDA0003144150030000025
if the duty cycles of the two bridge arms satisfy the above relation, the output voltage of the converter port 12 is equal to the target voltage Vab，DaAnd DbViewed as modulation signals for the a-phase and b-phase legs, vmAn output voltage considered to be per unit; according to the principle, different a-phase modulation signals and b-phase modulation signals are defined, and different modes and different outputs are realized.
Optionally, the different modes include a mode one and a mode two:
the first mode is as follows: simultaneously outputting one path of direct current and one path of alternating current;
expressions defining the a-phase modulation signal and the b-phase modulation signal are as follows,
Da＝k+m·cos(θ)，0≤k≤1,0≤m≤min(k,1-k)
Db＝k
the alternating current with the amplitude of m is obtained at the port 12 after the output is filtered by the inductor and the capacitor, and the direct current with the amplitude of k is obtained at the port 23;
the second mode is as follows: simultaneously outputting three paths of direct current electric energy;
Da＝a
Db＝b，0≤b≤1，0≤a≤1
the output is filtered by inductance and capacitance to obtain (a-b) V at port 12dcGet bV at port 23dcAt port 13, aV is obtaineddcDirect current.
The invention has the beneficial effects that: the single-stage dual-mode three-port power electronic converter with simple topology and low cost can simultaneously output one path of direct current and one path of alternating current of different voltage grades or simultaneously output three paths of direct current electric energy of different voltage grades under the condition of only using one basic topology, has a simple and easy modulation method, and solves the problems of complex topology, high cost and low power density of the conventional multi-port power electronic converter.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a single stage dual mode three port converter topology;
FIG. 2 is an embodiment of the present invention;
FIG. 3 illustrates a mode-modulation scheme;
FIG. 4 illustrates a mode two modulation scheme;
FIG. 5 is a simulation result of mode one;
FIG. 6 shows the results of a model two simulation.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.
The basic structure of the invention is shown in fig. 1, and comprises a direct current side filter capacitor connected in parallel with a topology formed by four switching devices on the direct current side, wherein the four switching devices are connected in the following way: the first switching device and the second switching device are connected in series to form an a-phase bridge arm, the third switching device and the fourth switching device are connected in series to form a b-phase bridge arm, and the midpoint of the a-phase bridge arm and the AC side filter inductor L1Connected in series to form a terminal 1; b-phase bridge arm midpoint and AC side filter inductor L2Connected in series to form a terminal 2; the negative electrode of the dc-side filter capacitor constitutes terminal 3. An AC side filter capacitor C is connected in parallel between the terminal 1 and the terminal 31An AC side filter capacitor C is connected in parallel between the terminal 2 and the terminal 32. The terminals 1 and 2 constitute the output port 12, the terminals 2 and 3 constitute the output port 23, and the terminals 1 and 3 constitute the output port 13. According to the invention, through setting different modulation modes, the alternating current can be output from the port 12, and the direct current can be output from the port 23, or three paths of direct currents can be simultaneously output from the port 12, the port 23 and the port 13, so that different power utilization requirements can be met.
Defining the opening of each bridge armThe off state being a binary function Si(i ═ a, b) in which Si1 denotes a switching tube T corresponding to the i-phase armi1Conduction, S i0 denotes the switching tube T corresponding to the i-phase armi2And conducting. Analyzing the working process of the converter to know that when the switching state of the i-phase bridge arm is 1, the output voltage v of the bridge armi＝Vdc(ii) a When the switch state of the i-phase bridge arm is 0, the output voltage v of the bridge armi＝0。
Definition V1Voltage, V, output for a-phase bridge arm2The output voltage V of the converter is the voltage output by the b-phase bridge armabEqual to the subtraction of the voltages of the two phase legs. The output voltage of the converter port 12 can be expressed as:
V12＝V1-V2
from the above analysis, the output conditions of the converter port 12 under all possible switching sequences are summarized in table 1.
TABLE 1 output voltages corresponding to different switching sequences
(SaSb) (11) (00) (10) (01)
V1 Vdc 0 Vdc 0
V2 Vdc 0 0 Vdc
V12 0 0 Vdc -Vdc
The essence of PWM modulation is to make the average value of the output voltage in each switching period equal to the desired voltage value, i (i ═ a, b) phase bridge arm output voltage ViThe expression of (a) is as follows,
Figure BDA0003144150030000051
the output voltage expression of the converter port 12 can be expressed as:
Figure BDA0003144150030000052
defining the time that the i-phase bridge arm is in the state 1 as the duty ratio Di(i ═ a, b), and D can be obtained by the above analysisiThe expression of (a) is as follows:
Figure BDA0003144150030000053
in combination with the above definitions, the relationship between the dc input voltage, the duty cycle and the ac side output can be obtained:
Figure BDA0003144150030000054
if the converter is aimed at outputting a sinusoidal AC voltage, assume that the reference signal Vref＝Vmcos (. theta.). Defining a modulation index m representing the DC side voltage V of the converterdcThe amplitude of the normalized output voltage, and m ═ Vm/VdcThen order vmMcos (θ), when the equation becomes:
Figure BDA0003144150030000055
as long as the duty ratios of the two bridge arms satisfy the above relation, the output voltage of the converter is equal to the target voltage VabAt this time DaAnd DbCan be regarded as modulation signals of a-phase bridge arm and b-phase bridge arm, vmCan be considered a per-unit output voltage. According to the principle, different a-phase modulation signals and b-phase modulation signals are defined, so that different modes and different outputs can be realized.
The first mode is as follows: simultaneously output one path of direct current and one path of alternating current
Expressions defining the a-phase modulation signal and the b-phase modulation signal are as follows,
Da＝k+m·cos(θ)(0≤k≤1,0≤m≤min(k,1-k))
Db＝k(0≤k≤1)
at this time, the output is filtered by an inductor and a capacitor, and then alternating current with the amplitude of m can be obtained at the port 12, and direct current with the amplitude of k can be obtained at the port 23.
And a second mode: output three paths of direct current electric energy simultaneously
Da＝a(0≤a≤1)
Db＝b(0≤b≤1)
In this case, (a-b) V can be obtained at the port 12 after the output is filtered by inductance and capacitancedcGet bV at port 23dcTo obtain aV at port 13dcDirect current.
Referring to fig. 2, the invention can be used for a three-port converter of a microgrid, electric energy generated by distributed power supplies such as photovoltaic cells, fans and the like is direct current, and the invention can convert the direct current generated by the distributed power supplies into required electric energy. When the electric equipment of the user simultaneously comprises the direct current load or the alternating current load, the electric energy output device works in the first mode to simultaneously provide alternating current and direct current, and when the electric equipment of the user comprises three or less direct current loads with different power utilization grades, the electric energy output device works in the second mode to simultaneously output three paths of direct current electric energy.
FIG. 3 illustrates a mode-modulation scheme; FIG. 4 illustrates a mode two modulation scheme; FIG. 5 is a simulation result of mode one; FIG. 6 shows the results of a model two simulation.
The multi-port power electronic converter adopts basic topology parallel connection and cascade connection modes to simultaneously obtain different types of voltages with different voltage grades, and the modes usually have more devices, larger volume and higher cost.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will 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, and all of them should be covered by the claims of the present invention.

Claims (2)

1. Single-stage double-mode three-port power electronic converter is characterized in that: the three-phase AC power supply comprises a DC side filter capacitor, four switching devices, two AC side filter inductors, two AC side filter capacitors and three output ports;
the direct current power supply is connected in parallel with a topology formed by four switching devices after passing through a direct current side filter capacitor, and the connection mode of the four switching devices is as follows: the first switching device is connected with the second switching device in series to form aThe phase bridge arm, the switching device III and the switching device IV are connected in series to form a phase b bridge arm, and the midpoint of the phase a bridge arm and the filter inductor L on the alternating current side1Connected in series to form a terminal 1; b-phase bridge arm midpoint and AC side filter inductor L2Connected in series to form a terminal 2; a terminal 3 is formed by the negative electrode of the filter capacitor at the direct current side; an AC side filter capacitor C is connected in parallel between the terminal 1 and the terminal 31An AC side filter capacitor C is connected in parallel between the terminal 2 and the terminal 32(ii) a Terminal 1 and terminal 2 form output port 12, terminal 2 and terminal 3 form output port 23, and terminal 1 and terminal 3 form output port 13;
the switching state of the bridge arm is a binary function SiI ═ a, b, where Si1 represents a switching tube T corresponding to the i-phase armi1Conduction, Si0 denotes the switching tube T corresponding to the i-phase armi2Conducting;
when the switch state of the i-phase bridge arm is 1, the bridge arm outputs voltage vi＝Vdc；
When the switch state of the i-phase bridge arm is 0, the bridge arm outputs voltage vi＝0；
V1Voltage, V, output for a-phase bridge arm2The output voltage V of the converter port 12 being the voltage output by the b-phase bridge arm12Equal to the subtraction of the voltages of the two-phase bridge arms; the output voltage of the converter is represented as:
V12＝V1-V2
the output of the converter, for all possible switching sequences, is:
when the switch state is (11), the output voltages of the port 12, the port 13 and the port 23 of the converter are 0 and V respectivelydcAnd Vdc；
When the switch state is (00), the output voltages of the port 12, the port 13 and the port 23 of the converter are 0, 0 and 0 respectively;
when the switch state is (10), the output voltages of the port 12, the port 13 and the port 23 of the converter are respectively Vdc、VdcAnd 0;
when the switch state is (01), the output voltages of the port 12, the port 13 and the port 23 of the converter are respectively-Vdc0 and Vdc；
The output voltage V of the i-phase bridge armiThe expression of (a) is:
Figure FDA0003610282390000011
the output voltage expression of the converter port 12 is expressed as:
Figure FDA0003610282390000012
defining the time that the i-phase bridge arm is in the state 1 as the duty ratio Di，DiThe expression of (a) is as follows:
Figure FDA0003610282390000021
obtaining the relation among the direct current input voltage, the duty ratio and the alternating current side output:
Figure FDA0003610282390000022
the converter being aimed at outputting a sinusoidal AC voltage, with reference signal Vref＝Vmcos (θ); defining a modulation index m representing the voltage V on the DC side of the converterdcThe amplitude of the normalized output voltage, and m ═ Vm/VdcThen order vmGiven as mcos (θ), the equation becomes:
Figure FDA0003610282390000023
if the duty cycles of the two bridge arms satisfy the above relation, the output voltage of the converter port 12 is equal to the target voltage Vab，DaAnd DbViewed as a-phase and b-phase armsModulation signal, vmAn output voltage considered to be per unit; according to the principle, different a-phase modulation signals and b-phase modulation signals are defined, and different modes and different outputs are realized.
2. The single-stage, dual-mode, three-port power electronic converter of claim 1, wherein: the different modes include mode one and mode two:
the first mode is as follows: simultaneously outputting one path of direct current and one path of alternating current;
expressions defining a-phase modulation signal and b-phase modulation signal are as follows,
Da＝k+m·cos(θ)，0≤k≤1,0≤m≤min(|k|,1-k)
Db＝k
the alternating current with the amplitude of m is obtained at the port 12 after the output is filtered by the inductor and the capacitor, and the direct current with the amplitude of k is obtained at the port 23;
the second mode is as follows: simultaneously outputting three paths of direct current electric energy;
Da＝a
Db＝b，0≤b≤1，0≤a≤1
the output is filtered by inductance and capacitance to obtain (a-b) V at port 12dcGet bV at port 23dcTo obtain aV at port 13dcDirect current.
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