CN112803777A - Four-port converter with symmetrical bipolar output and control method - Google Patents

Four-port converter with symmetrical bipolar output and control method Download PDF

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Publication number
CN112803777A
CN112803777A CN202110109547.5A CN202110109547A CN112803777A CN 112803777 A CN112803777 A CN 112803777A CN 202110109547 A CN202110109547 A CN 202110109547A CN 112803777 A CN112803777 A CN 112803777A
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input source
switching tube
source
secondary winding
load
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周国华
徐能谋
田庆新
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Southwest Jiaotong University
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Southwest Jiaotong University
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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
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
    • H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
    • H02M3/33592—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer having a synchronous rectifier circuit or a synchronous freewheeling circuit at the secondary side of an isolation transformer
    • 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
    • H02M3/158—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 including plural semiconductor devices as final control devices for a single load
    • H02M3/1582—Buck-boost converters

Abstract

The invention discloses a four-port converter with symmetrical bipolar output and a control method. When the power of the first input source is larger than that of the load, the converter works in a single-input three-output mode, namely the first input source simultaneously charges the second input source and supplies power to the load; when the first input source power is less than the load power, the first input source and the second input source simultaneously supply power to the load. The converter can simultaneously output symmetrical and common-ground bipolar voltages, can realize that two power sources and a plurality of loads are simultaneously connected into a system by adopting one converter, and can realize energy management between the sources and the loads through corresponding control.

Description

Four-port converter with symmetrical bipolar output and control method
Technical Field
The invention relates to the technical field of power electronics, in particular to a four-port converter with symmetrical bipolar output and a control method.
Background
The current society develops rapidly, and demand for energy increases day by day, and fossil energy is gradually facing exhaustion as non-renewable energy, and in the process of releasing energy, the fossil energy can generate a large amount of gases such as carbon dioxide, sulfur dioxide and the like, thus aggravating global warming effect and environmental pollution. In order to achieve sustainable development of human society, countries in the world have developed renewable energy sources and have reached a consensus to gradually replace fossil energy sources with limited resources and environmental pollution. Compared with conventional energy sources such as coal, oil, natural gas and the like, the output electric energy of the new energy power generation equipment has the characteristics of intermittency and instability, but the electric equipment generally needs stable and continuous electric energy. In order to solve the problem of unmatched real-time power between input and output, a new energy power supply system needs to be provided with energy storage links such as a storage battery or a super capacitor.
The new energy power supply system at least needs to be connected with a single-phase input port taking new energy as a main power supply, a bidirectional port of the energy storage link and a unidirectional output port of a load. The traditional connection scheme usually couples a plurality of single unidirectional and bidirectional converters through a direct current bus, so that a large number of power devices are needed, multi-stage energy conversion among different ports exists, and the defects of low energy density, low system efficiency, complex energy management strategy design and the like are caused. The multi-port converter can be connected with ports with different voltage values and meet the requirement of power flow direction by integrating a plurality of independent single/bidirectional converters. Compared with the traditional connection scheme that the unidirectional converter and the bidirectional converter are connected with the input source, the energy storage end and the load, the multi-port converter has the advantages of simple structure, high efficiency, unified energy management and the like. However, the conventional multi-port converter usually has only one load end, can only provide a direct current bus of one voltage class, cannot meet the requirement that loads of different voltage classes are simultaneously connected into a system, and also has the problems of no isolation between an input port and an output port, limited voltage gain, low reliability and the like.
Disclosure of Invention
The invention provides a four-port converter with symmetrical bipolar output aiming at the defects. The converter can simultaneously output symmetrical and common-ground bipolar voltages, can realize that two power sources and a plurality of loads are simultaneously connected into a system by adopting one converter, and can realize energy management between the sources and the loads through corresponding control. When the power of the first input source is larger than that of the load, the converter works in a single-input three-output mode, namely the first input source simultaneously charges the second input source and supplies power to the load; when the first input source power is less than the load power, the first input source and the second input source simultaneously supply power to the load.
The first technical scheme for realizing the aim of the invention is as follows: four-port converter with symmetrical bipolar output, comprising a first input source Vin1And a second input source V having a charging/discharging functionin2(ii) a First input source Vin1And a second input source Vin2Supplying power to the primary winding of a transformer, or first input source Vin1To a second input source Vin2The primary winding supplies power; the dotted terminal of the secondary winding of the transformer is connected to a diode D1And diode D2The non-homonymous end of the secondary winding is connected to the switching tube S5Source electrode of (1) and switching tube S6A drain electrode of (1); d1And S5Is connected to the capacitor Co1One end of (A), D2And S6Is connected to a capacitor Co2One end of (A), Co1And the other end of (C)o2Is connected to the inductance L at the other endbOne end of, LbThe other end of the secondary winding is connected to the non-homonymous end of the secondary winding; co1For connecting a first load, Co2For connection to a second load.
The second technical scheme is as follows: four-port converter with symmetrical bipolar output, comprising a first input source Vin1And a second input source V having a charging/discharging functionin2(ii) a First input source Vin1And a second input source Vin2Supplying power to the primary winding of a transformer, or first input source Vin1To a second input source Vin2The primary winding supplies power; the dotted terminal of the secondary winding of the transformer is connected to the switching tube S5Source electrode of (1) and switching tube S6The non-homonymous terminal of the secondary winding is connected to a diode D1And diode D2A cathode of (a); d1And S5Is connected to the capacitor Co1One end of (A), D2And S6Is connected to a capacitor Co2One end of (A), Co1And the other end of (C)o2Is connected to the inductance L at the other endbOne end of, LbThe other end of the secondary winding is connected to the homonymous end of the secondary winding; co1For connecting a first load, Co2For connection to a second load.
The third technical scheme is as follows: four-port converter with symmetrical bipolar output, comprising a first input source Vin1And a second input source V having a charging/discharging functionin2(ii) a First input source Vin1And a second input source Vin2Supplying power to the primary winding of a transformer, or first input source Vin1To a second input source Vin2The primary winding supplies power; the dotted terminal of the secondary winding of the transformer is connected to the switching tube S5Source electrode of (1) and switching tube S6The non-homonymous terminal of the secondary winding is connected to the switching tube S7Source electrode of (1) and switching tube S8A drain electrode of (1); s5And S7Is connected to the capacitor Co1One end of (A), S6Source and S of8Is connected to a capacitor Co2One end of (A), Co1And the other end of (C)o2Is connected to the inductance L at the other endbOne end of, LbThe other end of the secondary winding is connected to the non-homonymous end of the secondary winding; co1For connecting a first load, Co2For connection to a second load.
The fourth technical scheme is as follows: four-port converter with symmetrical bipolar output, comprising a first input source Vin1And a second input source V having a charging/discharging functionin2(ii) a First input source Vin1And a second input source Vin2Supplying power to the primary winding of a transformer, or first input source Vin1To a second input source Vin2The primary winding supplies power; the dotted terminal of the secondary winding of the transformer is connected to the switching tube S5Source electrode of (1) and switching tube S6The non-homonymous terminal of the secondary winding is connected to the switching tube S7Source electrode of (1) and switching tube S8A drain electrode of (1); s5And S7Is connected to the capacitor Co1One end of (A), S6Source and S of8Is connected to a capacitor Co2One end of (A), Co1And the other end of (C)o2Is connected to the inductance L at the other endbOne end of, LbThe other end of the secondary winding is connected to the homonymous end of the secondary winding; co1For connecting a first load, Co2For connection to a second load.
In the above four technical solutions, the first input source V is implementedin1And a second input source Vin2For supplying power to the primary winding, or first input source Vin1To a second input source Vin2And a primary side circuit for supplying power to the primary side winding, which can be: first input source Vin1Is connected to the inductor L1One terminal of (1) and an inductance L2One end of, L1Is connected to the switching tube S at the other end1Source electrode and switch tube S2And the dotted terminal, L, of the primary winding of the transformer2Is connected to the switching tube S at the other end3Source electrode and switch tube S4The drain of (3) and the non-dotted terminal of the primary winding; a second input source Vin2Is connected to S1And S3A drain electrode of (1); first input source Vin1And a second input source Vin2Are all connected to S2Source and S of4A source electrode of (a); first input source Vin1And is also connected in parallel with a capacitor Cin1Second input source Vin1And is also connected in parallel with a capacitor Cin2。
The four-port converter with the symmetrical bipolar output of the primary side circuit is adopted, and the control method comprises the following steps: switch tube S1And a second switch tube S2Conducting complementarily; switch tube S3And a switching tube S4Conducting complementarily; switch tube S5And a switching tube S6Complementary conduction is carried out, and the conduction duty ratio is 0.5; switch tube S1And a switching tube S3The conduction duty ratio is equal, and the switch tube S2And a switching tube S4The conduction duty ratios are equal in size; switch tube S3Is switched on at a time later than the switching tube S1The conduction time of (2) is 180 degrees of lag angle; switch tube S6Is switched on at a time later than the switching tube S1At a conduction time of lagging angle of
Figure BDA0002915549810000021
The output power of the first load and the second load is controlled by a phase shift angle
Figure BDA0002915549810000022
Regulating, first input source Vin1The output power of the switch tube S1Duty cycle adjustment of (2).
Compared with the prior art, the invention has the beneficial effects that:
1. the converter autonomously switches a single-input three-output working mode and a double-input double-output working mode according to input and output power without an additional controller.
2. The invention can realize power conversion and energy management and control among renewable energy sources, an energy storage system and bipolar output at the same time through one converter.
3. The voltage relation between the input port and the output port of the converter is flexible, and the converter can boost and reduce voltage; the converter can output symmetrical and common-ground bipolar voltage, and has wide application range and high reliability.
4. The method combining pulse width modulation and phase shift modulation is adopted, and the maximum power point tracking control of renewable energy sources and the constant voltage control of bipolar loads can be realized at the same time.
Drawings
Fig. 1 is a schematic diagram of a first four-port converter with symmetrical bipolar output.
Fig. 2 is a schematic diagram of a second four-port converter with symmetrical bipolar output.
Fig. 3 is a schematic diagram of a third four-port converter with symmetrical bipolar output.
Fig. 4 is a schematic diagram of a fourth four-port converter with symmetrical bipolar output.
Fig. 5 is a schematic diagram of another four-port converter with symmetrical bipolar output for a primary circuit.
Fig. 6 is a schematic diagram of the control circuit of the first four-port converters with symmetrical bipolar output.
FIG. 7 is a first four-port converter S1～S6The driving signal and the theoretical waveform of (c).
Fig. 8 is a steady state waveform for the first four port converter.
Fig. 9 is a transient response waveform of the first four-port converter.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
Four-port converter with symmetrical bipolar output, capable of being simultaneously connected to a first power source Vin1A second power source Vin2And the load can output symmetrical and common-ground bipolar voltage, and has the advantages of few circuit devices, high power density, wide application range and simple power management and control.
Referring to FIG. 1, a first four-port converter with symmetrical bipolar output comprises a first power source Vin1A second power source Vin2Positive polarity output port Vo1Negative polarity output port Vo2First input filter capacitor Cin1Second input filter capacitor Cin2First output filter capacitor Co1Second output filter capacitor Co2First inductance L1Second inductance L2Third inductance LbA first switch tube S1A second switch tube S2A third switching tube S3Fourth switch tube S4Fifth switching tube S5The sixth switching tube S6First diode D1A second diode D2First load R1Second load R2And an isolation transformer.
First input source Vin1The positive pole is connected with a first inductor L1A second inductor L2And a first capacitor Cin1One end of (1), a first inductance L1Are respectively connected with the first switch tube S1And a second switching tube S2The serial common terminal of the transformer and the primary winding homonymous terminal of the transformer; second inductance L2Are respectively connected with the third switching tube S3And a fourth switching tube S4And a transformerThe primary winding of the transformer is a non-homonymous terminal; first input source Vin1Negative pole of (1), second input source Vin2Negative electrode of (1), first capacitor Cin1And the other terminal of the first capacitor Cin2Is connected in parallel and is connected to the second switch tube S in sequence2Source electrode and fourth switching tube S4A source electrode of (a); a second input source Vin2Positive pole and second capacitor Cin2Is connected to the first switch tube S in turn1Drain electrode of (1) and third switching tube S3Of the substrate. The same name end of the secondary winding of the transformer is connected with the first diode D1And a second diode D2The non-homonymous ends of the secondary windings are respectively connected with the fifth switch tube S5And a sixth switching tube S6And a third inductance LbOne end of (a); the third inductor LbIs connected to the first output filter capacitor C in turno1And a second output filter capacitor Co2And a first load R, and1and a second load R2A series common terminal of; first diode D1Is connected to the fifth switching tube S5Drain electrode, first output capacitor Co1And a first load R1The other end of (a); second diode D2Is connected to a sixth switching tube S in turn6Source electrode, second output capacitor Co2And a second load R2And the other end of the same.
Referring to FIG. 2, a second four-port converter with symmetrical bipolar output has a schematic circuit diagram including a first power source Vin1A second power source Vin2Positive polarity output port Vo1Negative polarity output port Vo2First input filter capacitor Cin1Second input filter capacitor Cin2First output filter capacitor Co1Second output filter capacitor Co2First inductance L1Second inductance L2Third inductance LbA first switch tube S1A second switch tube S2A third switching tube S3Fourth switch tube S4Fifth switching tube S5The sixth switching tube S6Of 1 atA diode D1A second diode D2First load R1Second load R2And an isolation transformer.
First input source Vin1The positive pole is connected with a first inductor L1A second inductor L2And a first capacitor Cin1One end of (1), a first inductance L1Are respectively connected with the first switch tube S1And a second switching tube S2The serial common terminal of the transformer and the primary winding homonymous terminal of the transformer; second inductance L2Are respectively connected with the third switching tube S3And a fourth switching tube S4And a non-homonymous terminal of a primary winding of the transformer; first input source Vin1Negative pole of (1), second input source Vin2Negative electrode of (1), first capacitor Cin1And the other terminal of the first capacitor Cin2Is connected in parallel and is connected to the second switch tube S in sequence2Source electrode and fourth switching tube S4A source electrode of (a); a second input source Vin2Positive pole and second capacitor Cin2Is connected to the first switch tube S in turn1Drain electrode of (1) and third switching tube S3Of the substrate. The dotted ends of the secondary winding of the transformer are respectively connected with the fifth switching tube S5And a sixth switching tube S6And a third inductance LbOne end of (a); the third inductor LbIs connected to the first output filter capacitor C in turno1And a second output filter capacitor Co2And a first load R, and1and a second load R2A series common terminal of; the non-homonymous end of the secondary winding is connected with the first diode D1And a second diode D2A series common terminal of; fifth switch tube S5The drain electrode is connected to the first diode D1Cathode and first output capacitor Co1And a first load R1The other end of (a); sixth switching tube S6The source is connected to a second diode D2Anode of, a second output capacitor Co2And a second load R2And the other end of the same.
A third type with symmetrical bipolar output, as shown in FIG. 3A circuit schematic for a four-port converter comprising a first power source Vin1A second power source Vin2Positive polarity output port Vo1Negative polarity output port Vo2First input filter capacitor Cin1Second input filter capacitor Cin2First output filter capacitor Co1Second output filter capacitor Co2First inductance L1Second inductance L2Third inductance LbA first switch tube S1A second switch tube S2A third switching tube S3Fourth switch tube S4Fifth switching tube S5The sixth switching tube S6Seventh switching tube S7The eighth switching tube S8First load R1Second load R2And an isolation transformer.
First input source Vin1The positive pole is connected with a first inductor L1A second inductor L2And a first capacitor Cin1One end of (1), a first inductance L1Are respectively connected with the first switch tube S1And a second switching tube S2The serial common terminal of the transformer and the primary winding homonymous terminal of the transformer; second inductance L2Are respectively connected with the third switching tube S3And a fourth switching tube S4And a non-homonymous terminal of a primary winding of the transformer; first input source Vin1Negative pole of (1), second input source Vin2Negative electrode of (1), first capacitor Cin1And the other terminal of the first capacitor Cin2Is connected in parallel and is connected to the second switch tube S in sequence2Source electrode and fourth switching tube S4A source electrode of (a); a second input source Vin2Positive pole and second capacitor Cin2Is connected to the first switch tube S in turn1Drain electrode of (1) and third switching tube S3Of the substrate. The dotted end of the secondary winding of the transformer is connected with a fifth switching tube S5And a sixth switching tube S6The non-homonymous ends of the secondary windings are respectively connected with a seventh switch tube S7And an eighth switching tube S8And a third inductance LbOne end of (a); the third inductor LbIs connected to the first output filter capacitor C in turno1And a second output filter capacitor Co2And a first load R, and1and a second load R2A series common terminal of; fifth switch tube S5Is connected to the seventh switch tube S7Drain electrode, first output capacitor Co1And a first load R1The other end of (a); sixth switching tube S6Is connected to the eighth switching tube S in turn8Source electrode, second output capacitor Co2And a second load R2And the other end of the same.
A fourth four-port converter with symmetrical bipolar output, as shown in fig. 4, is a circuit schematic.
The four converters adopt different secondary side circuits, and the primary side circuits are the same. In fact, the primary circuit only needs to realize the first input source Vin1And a second input source Vin2Supplying power to the primary winding of a centre-tapped transformer, or a first input source Vin1To a second input source Vin2And the primary winding, other configurations may be used, as shown in fig. 5. In the figure, the secondary side circuit is only an example of the fourth converter configuration, and secondary side circuits of the other three converters may be used.
As shown in fig. 6, the schematic diagram of the control circuit of the first four-port converters with symmetrical bipolar output includes: the power supply comprises a first power source controller, a second power source controller, an output voltage controller, a phase-shifting controller and a pulse modulation circuit. In this example, the first input source is a photovoltaic array and the second input source is a battery. The first Power source controller realizes Maximum Power Point Tracking (MPPT) control by collecting photovoltaic voltage Vin1And current Iin1MPPT operation is carried out to obtain a control signal ve1Realizing the maximum power output of photovoltaic; the second power source controller controls the voltage and current of the storage battery by sampling the voltage V at two ends of the storage batteryin2And charging and discharging current Iin2To obtain a control signal ve2Thereby realizing overcharge protection and overdischarge protection of the storage battery; a first power sourceThe output of the controller and the second power source controller takes the minimum value and is connected with the pulse modulation circuit to generate a switching tube S1～S4The on signal of (c). The output voltage controller samples two paths of output voltage Vo1And Vo2Then calculate Vox＝0.5*Vo1-0.5*Vo2And will VoxAnd a reference voltage Vo_refComparing, and outputting a phase shift angle; the phase shift angle of the carrier is adjusted by a phase shift controller, and a switching tube S with the duty ratio of 0.5 is generated by a pulse modulation circuit5And S6The on signal of (c). The phase shifting angle can control the output voltage, and the buck-boost function is realized.
The four-port converter with symmetrical bipolar output has six working states in half of the switching period, and the working state in the other half of the switching period is symmetrical to the first half of the switching period.
As shown in FIG. 7, taking the first four-port converter with symmetrical bipolar output as an example, the control circuit is used to generate the switch driving signal and theoretical waveform, where iL1And iL2The current of the first inductor and the current of the second inductor; v. ofabFor the voltage, v, from the dotted terminal to the non-dotted terminal of the primary side of the transformercdThe voltage from the homonymous end to the non-homonymous end of the secondary side of the transformer is obtained; i.e. ipIs the current flowing into the same-name end of the primary side of the transformer. First switch tube S1And a second switch tube S2Conducting complementarily; third switch tube S3And a fourth switching tube S4Conducting complementarily; fifth switch tube S5And a sixth switching tube S6Complementary conduction is carried out, and the conduction duty ratio is fixed to be 0.5; first switch tube S1And a third switching tube S3The conduction duty ratio is equal, and the second switch tube S2And a fourth switching tube S4The conduction duty ratios are equal in size; third switch tube S3Is switched on at a time later than the first switch tube S1The conduction time of (2) is 180 degrees of lag angle; sixth switching tube S6Is switched on at a time later than the first switch tube S1At a conduction time of lagging angle of
Figure BDA0002915549810000061
Power output phase shift angle of bipolar output port
Figure BDA0002915549810000062
Regulating, inputting source Vin1Is powered by a first switching tube S1Duty cycle adjustment of (2).
Working mode 1[ t ]0～t1]：S1、S4And S5Conduction, S2、S3And S6Turning off; inductor L1Current i ofL1Reduced linearity, inductance L2Current i ofL2Linearly increasing, primary winding current i of transformerpA linear increase; the homonymous terminal of the secondary winding passes through D2Supplying power to the negative port, and passing the non-homonymous end of the secondary winding through S5Power is supplied to the positive polarity port.
Working mode 2[ t ]1～t2]：S1、S4And S5Conduction, S2、S3And S6Turning off; inductor L1Current i ofL1Reduced linearity, inductance L2Current i ofL2Linearly increasing, primary winding current i of transformerpLinearly increasing, secondary winding through D1And S5And then follow current.
Working mode 3[ t ]2～t3]：S1、S4And S6Conduction, S2、S3And S5Turning off; inductor L1Current i ofL1Linear reduction to minimum value, inductance L2Current i ofL2Linearly increasing, primary winding current i of transformerpLinearly increasing to a maximum; the homonymous terminal of the secondary winding passes through D1Supplying power to the positive port, and passing the non-homonymous terminal of the secondary winding through S6Power is supplied to the negative polarity port.
Working mode 4[ t ]3～t4]：S4And S6Conduction, S1、S2、S3And S5Turning off; inductor L1Current i ofL1Linear increase, inductance L2Current i ofL2Linearly increasing, primary winding current i of transformerpA linear decrease; the homonymous terminal of the secondary winding passes through D1Supplying power to the positive port, and passing the non-homonymous terminal of the secondary winding through S6Power is supplied to the negative polarity port.
Working mode 5[ t ]4～t5]：S2、S4And S6Conduction, S1、S3And S5Turning off; inductor L1Current i ofL1Linear increase, inductance L2Current i ofL2Linearly increasing to a maximum value, the primary winding current i of the transformerpA linear decrease; the homonymous terminal of the secondary winding passes through D1Supplying power to the positive port, and passing the non-homonymous terminal of the secondary winding through S6Power is supplied to the negative polarity port.
Working mode 6[ t ]5～t6]：S2And S6Conduction, S1、S3、S4And S5Turning off; inductor L1Current i ofL1Linear increase, inductance L2Current i ofL2Linearly decreasing, primary winding current i of the transformerpA linear decrease; the homonymous terminal of the secondary winding passes through D1Supplying power to the positive port, and passing the non-homonymous terminal of the secondary winding through S6Power is supplied to the negative polarity port.
Performing time domain simulation analysis on the first four-port converter by using PSIM simulation software, wherein the first input source Vin1By adopting a photovoltaic cell model, the maximum power point voltage of the photovoltaic cell is 40V, the maximum power point current is 8A, and other system parameters are set as follows: cin1＝Cin2＝100μF，Co1＝Co2＝470μF，L1＝L2＝100μH，Lb500 muH, storage cell voltage Vin2120V, the positive output port voltage is Vo150V, the negative output port voltage is Vo2-50V, switching frequency fsThe simulation results are shown in fig. 6 and 7 at 100 kHz.
Fig. 8 is a steady state waveform of a first four port converter with symmetrical bipolar output, from which it can be seen that the simulation results are consistent with theoretical analysis.
Fig. 9 is a transient response waveform of a first four-port converter with symmetrical bipolar output load jump, when the maximum output power of the photovoltaic module is 320W, the photovoltaic module always outputs at the maximum power through MPPT. At the initial moment, the power consumed by the load is 250W, and the power consumed by the energy storage unit is 70W; the load power is increased from 250W to 450W at 0.1s, and the power provided by the energy storage unit is 130W; at 0.15s, the load power is reduced from 450W to 250W, and the system operation condition is consistent with the initial state. As can be seen from the figure, when the load changes, both the positive polarity output terminal voltage and the negative polarity output terminal voltage are kept constant.
According to the theoretical analysis and simulation, the four-port converter with the symmetrical bipolar output has the advantages of simple structure, capability of outputting symmetrical and common-ground bipolar voltage, wide application range, high reliability, few switching devices and capability of realizing centralized control; and the converter can automatically switch between a single-input three-output mode and a double-input double-output mode according to the input power and the output power, the power control is simple, and the charge-discharge power of the second input source can be automatically adjusted. The converter proposed by the invention therefore has significant advantages over the prior art.

Claims (6)

1. Four-port converter with symmetrical bipolar output, characterized in that it comprises a first input source Vin1And a second input source V having a charging/discharging functionin2(ii) a First input source Vin1And a second input source Vin2Supplying power to the primary winding of a transformer, or first input source Vin1To a second input source Vin2The primary winding supplies power;
the dotted terminal of the secondary winding of the transformer is connected to a diode D1And diode D2The non-homonymous end of the secondary winding is connected to the switching tube S5Source electrode of (1) and switching tube S6A drain electrode of (1); d1And S5Is connected to the capacitor Co1One end of (A), D2And S6Is connected to a capacitor Co2One end of (A), Co1And the other end of (C)o2Is connected to the inductance L at the other endbOne end of, LbThe other end of the secondary winding is connected to the non-homonymous end of the secondary winding; co1For connecting a first load, Co2For connection to a second load.
2. Four-port converter with symmetrical bipolar output, characterized in that it comprises a first input source Vin1And a second input source V having a charging/discharging functionin2(ii) a First input source Vin1And a second input source Vin2Supplying power to the primary winding of a transformer, or first input source Vin1To a second input source Vin2The primary winding supplies power;
the dotted terminal of the secondary winding of the transformer is connected to the switching tube S5Source electrode of (1) and switching tube S6The non-homonymous terminal of the secondary winding is connected to a diode D1And diode D2A cathode of (a); d1And S5Is connected to the capacitor Co1One end of (A), D2And S6Is connected to a capacitor Co2One end of (A), Co1And the other end of (C)o2Is connected to the inductance L at the other endbOne end of, LbThe other end of the secondary winding is connected to the homonymous end of the secondary winding; co1For connecting a first load, Co2For connection to a second load.
3. Four-port converter with symmetrical bipolar output, characterized in that it comprises a first input source Vin1And a second input source V having a charging/discharging functionin2(ii) a First input source Vin1And a second input source Vin2Supplying power to the primary winding of a transformer, or first input source Vin1To a second input source Vin2The primary winding supplies power;
the dotted terminal of the secondary winding of the transformer is connected to the switching tube S5Source electrode of (1) and switching tube S6The non-homonymous terminal of the secondary winding is connected to the onClosing pipe S7Source electrode of (1) and switching tube S8A drain electrode of (1); s5And S7Is connected to the capacitor Co1One end of (A), S6Source and S of8Is connected to a capacitor Co2One end of (A), Co1And the other end of (C)o2Is connected to the inductance L at the other endbOne end of, LbThe other end of the secondary winding is connected to the non-homonymous end of the secondary winding; co1For connecting a first load, Co2For connection to a second load.
4. Four-port converter with symmetrical bipolar output, characterized in that it comprises a first input source Vin1And a second input source V having a charging/discharging functionin2(ii) a First input source Vin1And a second input source Vin2Supplying power to the primary winding of a transformer, or first input source Vin1To a second input source Vin2The primary winding supplies power;
the dotted terminal of the secondary winding of the transformer is connected to the switching tube S5Source electrode of (1) and switching tube S6The non-homonymous terminal of the secondary winding is connected to the switching tube S7Source electrode of (1) and switching tube S8A drain electrode of (1); s5And S7Is connected to the capacitor Co1One end of (A), S6Source and S of8Is connected to a capacitor Co2One end of (A), Co1And the other end of (C)o2Is connected to the inductance L at the other endbOne end of, LbThe other end of the secondary winding is connected to the homonymous end of the secondary winding; co1For connecting a first load, Co2For connection to a second load.
5. Four-port converter with symmetrical bipolar output according to any of claims 1 to 4, characterized in that the first input source Vin1Is connected to the inductor L1One terminal of (1) and an inductance L2One end of, L1Is connected to the switching tube S at the other end1Source electrode and switch tube S2Of the drain electrode and the transformerDotted terminal of primary winding, L2Is connected to the switching tube S at the other end3Source electrode and switch tube S4The drain of (3) and the non-dotted terminal of the primary winding; a second input source Vin2Is connected to S1And S3A drain electrode of (1); first input source Vin1And a second input source Vin2Are all connected to S2Source and S of4A source electrode of (a); first input source Vin1And is also connected in parallel with a capacitor Cin1Second input source Vin1And is also connected in parallel with a capacitor Cin2。
6. The method of claim 5 wherein the switching transistor S is a switch transistor1And a second switch tube S2Conducting complementarily; switch tube S3And a switching tube S4Conducting complementarily; switch tube S5And a switching tube S6Complementary conduction is carried out, and the conduction duty ratio is 0.5; switch tube S1And a switching tube S3The conduction duty ratio is equal, and the switch tube S2And a switching tube S4The conduction duty ratios are equal in size; switch tube S3Is switched on at a time later than the switching tube S1The conduction time of (2) is 180 degrees of lag angle; switch tube S6Is switched on at a time later than the switching tube S1At a conduction time of lagging angle of
Figure FDA0002915549800000021
The output power of the first load and the second load is controlled by a phase shift angle
Figure FDA0002915549800000022
Regulating, first input source Vin1The output power of the switch tube S1Duty cycle adjustment of (2).
CN202110109547.5A 2021-01-25 2021-01-25 Four-port converter with symmetrical bipolar output and control method Pending CN112803777A (en)

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CN110752752A (en) * 2019-10-25 2020-02-04 中国科学院电工研究所 High-transformation-ratio DC-DC converter and method suitable for photovoltaic direct-current boosting system
CN111262443A (en) * 2020-01-23 2020-06-09 哈尔滨工业大学 Direct-current solid-state transformer with bipolar output voltage self-balancing capability
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CN103151932A (en) * 2013-02-05 2013-06-12 南京航空航天大学 Buck / Boost integration type three-port direct current converter and control method thereof
CN103944396A (en) * 2014-04-11 2014-07-23 燕山大学 LLC resonance type three-port DC-DC converter and control method thereof
CN105515417A (en) * 2016-01-26 2016-04-20 南京航空航天大学 Double-output single-phase PFC convertor and combined type power conversion system and control method thereof
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