CN110838791A - Two-switch three-port direct current converter and control method and circuit thereof - Google Patents

Two-switch three-port direct current converter and control method and circuit thereof Download PDF

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CN110838791A
CN110838791A CN201911130380.XA CN201911130380A CN110838791A CN 110838791 A CN110838791 A CN 110838791A CN 201911130380 A CN201911130380 A CN 201911130380A CN 110838791 A CN110838791 A CN 110838791A
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energy storage
switch
converter
electrode
input
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CN110838791B (en
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田庆新
周国华
毕强
张小兵
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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
    • H02M3/02—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
    • 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
    • H02M1/0083—Converters characterised by their input or output configuration

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  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention discloses six two-switch three-port direct-current converters and a control method and a circuit thereof. One of them, switch tube S1Is connected to the switching tube S2Of the drain electrode, S2Is connected to a diode D2And one end of the energy storage inductor L, D2Is connected to the diode D1The cathode of (1). The control method comprises that the sampling value and the reference value of the input voltage of the DC converter are compared with the sawtooth wave after error amplification to generate a driving signal to control S1(ii) a Meanwhile, the sampling value and the reference value of the load voltage of the DC converter are compared with the sawtooth wave after error amplification to generate a driving signal to control S2. The control circuit comprises two error amplifiers, two comparators and a sawtooth wave input circuit, wherein the output ends of the two error amplifiers are respectively connected to the input ends of the two comparators, and the output ends of the two comparators are respectively connected with the S1And S2A gate electrode of (1). The invention has the advantages that the input source, the energy storage equipment and the load can be realized by adopting a single converterInter-power management and control.

Description

Two-switch three-port direct current converter and control method and circuit thereof
Technical Field
The invention belongs to the technical field of power electronics, and particularly relates to a two-switch three-port direct-current converter, and a control method and a control circuit thereof.
Background
In recent years, with the increasing environmental pollution and energy crisis problems, it has become a hot point of research to generate electricity by using new energy such as solar energy, hydrogen energy, wind energy, and the like. The new energy power generation system is divided into two operation modes of grid-connected operation and independent operation according to whether the new energy power generation system is connected with a power grid or not, and the independently operated new energy power generation system is widely applied to power supply in non-power grid areas such as remote mountainous areas, islands, industrial parks and the like due to the advantages of simple structure, high power supply quality and the like. In addition, the independently operated new energy power generation system is also widely applied to power supply of new energy automobiles and independent LED lighting systems. However, since the output characteristics of the new energy power generation system are often closely related to environmental factors, the output characteristics of the new energy power generation system under different environmental conditions have randomness and volatility. Therefore, an energy storage unit must be equipped in the independently operated new energy power generation system to store and regulate the electric energy so as to meet the requirements of the electric load on the continuity and stability of the power supply.
In a traditional new energy power generation system, because an input source, energy storage equipment and a load need to be managed simultaneously, a plurality of independent converters are often needed for electric energy conversion and energy management, the system is complex in structure, low in efficiency and high in cost, and centralized control cannot be achieved. In order to further improve the efficiency of the system and reduce the cost of the system, in order to solve the problems of the system, researchers have proposed to apply a three-port converter to a new energy power generation system, so as to improve the efficiency of the system, reduce the cost, improve the power density, and realize centralized control. Many documents already provide various topologies of three-port converters, which can be divided into an isolated type and a non-isolated type, wherein the input end and the load end of the isolated type three-port converter are electrically isolated and are usually used in high-power and high-voltage occasions, but the system has a large volume and a large number of devices; the non-isolated three-port converter has fewer devices and higher integration level, and is suitable for occasions with medium and small power. However, the existing non-isolated three-port converter often includes three or more switching tubes, which results in higher cost and more complex control of the system.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides six types of two-switch three-port direct current converters capable of realizing power flow management among an input power source, an energy storage device and a load, and a control method and a control circuit thereof.
The first two-switch three-port DC converter includes a first switch tube S1A second switch tube S2A first diode D1A second diode D2And an energy storage inductor L; s1Is connected to S2Of the drain electrode, S2Is connected to D2And one end of L, D2Is connected to D1A cathode of (a); s1Drain electrode of (1) and (D)1The anodes of (1) are respectively the positive and negative poles of the input terminal, S1Source electrode and D1The cathodes of the two electrodes are respectively a positive electrode and a negative electrode of the energy storage end, the other end of the L and the D1The anode of (a) is the positive electrode and the negative electrode of the load end respectively.
The second two-switch three-port DC converter comprises a first switch tube S1A second switch tube S2A first diode D1A second diode D2And an energy storage inductor L; one end of L is connected to S2Drain electrode of (1) and (D)2Of the anode, S2Is connected to S1Drain electrode of, D2Is connected to D1The anode of (1); the other end of L and S1The source electrodes of (1) are respectively the positive electrode and the negative electrode of the input end, D2And S1The drain electrodes of (A) are respectively the anode and the cathode of the energy storage end, D1And S1The source electrodes of (1) are respectively the anode and the cathode of the load end.
The third two-switch three-port DC converter includes a first switch tube S1A second switch tube S2A first diode D1A second diode D2And an energy storage inductor L; s1Is connected to S2Of the drain electrode, S2Is connected to D1And one end of L, D1Is connected to D2A cathode of (a); s1And the other end of L is the positive and negative poles of the input end, S1Source electrode and D1The anodes of (A) are respectively the positive electrode and the negative electrode of the energy storage end, D2And the other end of the L is a positive electrode and a negative electrode of the load end respectively.
A fourth two-switch three-port DC converter including a first switch tube S1A second switch tube S2A first diode D1A second diode D2A first energy storage inductor L1A second energy storage inductor L2And an energy storage capacitor C1；L1Is connected at one end to S2Drain electrode of (1) and C1One end of (A), C1Is connected at the other end to D2And L2One end of (A), S2Is connected to S1Drain electrode of, D2Is connected to D1Anode of (D)1Is connected to S1A source electrode of (a); l is1And the other end of (1) and S1The source electrodes of (1) are respectively the positive electrode and the negative electrode of the input end, S2Source electrode and D2The cathodes of (A) are respectively the positive electrode and the negative electrode of the energy storage end, L2And another end of D1The cathodes of (a) are respectively the positive electrode and the negative electrode of the load end.
The fifth two-switch three-port DC converter comprises a first switch tube S1A second switch tube S2A first diode D1A second diode D2A first energy storage inductor L1A second energy storage inductor L2And an energy storage capacitor C1；L1Is connected at one end to S2Drain electrode of (1) and C1One end of (A), C1Is connected at the other end to D2And L2One end of (A), S2Is connected to S1Drain electrode of, D2Is connected to D1Anode of (2), L2Is connected at the other end to S1A source electrode of (a); l is1And the other end of (1) and S1The source electrodes of (1) are respectively the positive electrode and the negative electrode of the input end, D2And S2The source electrodes of (A) are respectively the anode and the cathode of the energy storage end, D1And L2The other ends of the two ends are respectively a positive electrode and a negative electrode of the load end.
The sixth two-switch three-port DC converter comprises a first switch tube S1A second switch tube S2A first diode D1A second diode D2A first energy storage inductor L1A second energy storage inductor L2And an energy storage capacitor C1；S1Is connected to S2Of the drain electrode, S2Is connected to L1And C and1one end of (A), C1Is connected at the other end to D2And L2One end of (A), D2Is connected to D1A cathode of (D)1Is connected to L1The other end of (a); s1And L is1The other ends of the two are respectively the positive pole and the negative pole of the input end, S1Source electrode and D2The anodes of (A) are respectively the anode and the cathode of the energy storage end, L2And another end of D1The anode of (a) is the positive electrode and the negative electrode of the load end respectively.
Control method of two-switch three-port direct current converter, and sampling value v of input voltage of direct current converter1And a reference value V1_refAfter error amplification, the signal is mixed with sawtooth wave vtComparing to generate a drive signal Vgs1Controlling a first switching tube of the direct current converter; at the same time, the sampled value v of the load voltage of the DC converteroAnd a reference value Vo_refAfter error amplification, the signal is mixed with sawtooth wave vtComparing to generate a drive signal Vgs2And controlling a second switching tube of the direct current converter.
Further, a reference value V of the input voltage1_refFrom sampled values v of the input voltage of the DC converter1And the input current sample value i1Obtained by MPPT algorithm.
A control circuit of a two-switch three-port direct current converter comprises a first error amplifier EA1, a second error amplifier EA2, a first comparator CMP1 and a second comparator CMP 2; the input end of the EA1 is used for inputting a sampled value v of the input voltage of the direct current converter1And a reference value V1_refThe output terminal is connected to the positive input terminal of the CMP 1; with input terminals of EA2 for input of DC-converter load voltageSampling value voAnd a reference value Vo_refThe output terminal is connected to the positive input terminal of the CMP 2; the negative inputs of CMP1 and CMP2 are for inputting sawtooth wave vt(ii) a The output end of the CMP1 is used for connecting the grid electrode of the first switch tube of the direct current converter, and the output end of the CMP2 is used for connecting the grid electrode of the second switch tube of the direct current converter.
Further, the MPPT controller is also included; the input end of the MPPT controller is used for inputting a sampling value v of the input voltage of the direct current converter1And the input current sample value i1And the output is connected to an input of EA 1.
Compared with the prior art, the invention has the beneficial effects that:
(1) power management and control among the input source, the energy storage device and the load can be achieved by adopting a single converter.
(2) The converter only comprises two switching tubes, so that the cost is low and the control is simple.
(3) Single-stage power conversion is carried out between any two ports, and centralized control can be realized.
Drawings
Fig. 1 is a schematic diagram of a first two-switch three-port dc converter.
Fig. 2 is a schematic diagram of a second two-switch three-port dc converter.
Fig. 3 is a schematic diagram of a third two-switch three-port dc converter.
Fig. 4 is a schematic diagram of a fourth three-port dc converter.
Fig. 5 is a schematic diagram of a fifth two-switch three-port dc converter.
Fig. 6 is a schematic diagram of a sixth two-switch three-port dc converter.
Fig. 7 is a schematic diagram of a control circuit of a two-switch three-port dc converter.
Fig. 8 shows two driving signals of a two-switch three-port dc converter.
Fig. 9 is an equivalent circuit of the second two-switch three-port dc converter in four switching states. Wherein FIG. 9(a) is the firstSwitch tube S1And a second switching tube S2Equivalent circuit when conducting simultaneously, FIG. 9(b) is the first switch tube S1Conducting the second switch tube S2An equivalent circuit at the time of turn-off, and FIG. 9(c) shows the first switching tube S1Off, the second switching tube S2An equivalent circuit when conducting, and FIG. 9(d) shows the first switch tube S1And a second switching tube S2And an equivalent circuit when the circuit is turned off.
Fig. 10 shows simulation results of the second two-switch three-port dc converter during load jump.
Fig. 11 shows simulation results of the second two-switch three-port dc converter at input transition.
Symbolic illustration in fig. 10 and 11: v. of1Is the voltage across the input source, i1Is the current of the input source, voIs the voltage across the load, ioFor the current flowing through the load, i2Is the discharge current of the energy storage device.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
As shown in fig. 1, a first two-switch three-port dc converter includes: input source V1Energy storage device V2A first switch tube S1A second switch tube S2A first diode D1A second diode D2Energy storage inductance L, filter capacitor C and load R, wherein: first switch tube S1Drain and input source V of1Is connected with the positive pole of the first switch tube S1Respectively with the second switch tube S2And energy storage device V2Is connected with the positive pole of the second switch tube S2Respectively with a second diode D2Is connected with one end of an energy storage inductor L, and a second diode D2Are respectively connected to the energy storage devices V2Negative electrode of (2) and first diode D1The other end of the energy storage inductor L is respectively connected with one end of a filter capacitor C and one end of a load R, and an input source V1Are respectively connected to the first diode D1The anode of (C), the other of the filter capacitor CTerminal and the other terminal of load R.
As shown in fig. 2, a second two-switch three-port dc converter includes: input source V1Energy storage device V2A first switch tube S1A second switch tube S2A first diode D1A second diode D2Energy storage inductance L, filter capacitor C and load R, wherein: one end of the energy storage inductor L and the input source V1The other end of the energy storage inductor L is respectively connected to the second switch tube S2And a second diode D2Anode of (2), second switching tube S2Respectively with the energy storage device V2Negative pole of (2) and first switch tube S1Is connected to the drain of a second diode D2Respectively with the energy storage device V2And a first diode D1Is connected to the anode of a first diode D1Is connected to one end of a filter capacitor C and one end of a load R, the other end of the load R is connected with an input source V respectively1Negative electrode of (1), first switching tube S1Is connected to the other end of the filter capacitor C.
As shown in fig. 3, a third two-switch three-port dc converter includes: input source V1Energy storage device V2A first switch tube S1A second switch tube S2A first diode D1A second diode D2Energy storage inductance L, filter capacitor C and load R, wherein: first switch tube S1Drain and input source V of1Is connected with the positive pole of the first switch tube S1Respectively with the energy storage device V2Positive pole and second switch tube S2Is connected with the drain electrode of the second switching tube S2With the source of the energy storage inductor L and the first diode D, respectively1Is connected to the cathode of a first diode D1Respectively with an energy storage device V2And a second diode D2Is connected to the cathode of a second diode D2Is connected to one end of a filter capacitor C and one end of a load R, the other end of the load R is connected to an input source V1The other end of the energy storage inductor L and the other end of the filter capacitor C.
As shown in fig. 4, a fourth two-switch three-port dc converter includes: input source V1Energy storage device V2A first switch tube S1A second switch tube S2A first diode D1A second diode D2A first energy storage inductor L1A second energy storage inductor L2And an energy storage capacitor C1Filter capacitor C2And a load R, wherein: first energy storage inductor L1One end of (1) and an input source V1Is connected with the positive pole of the first energy storage inductor L1The other end of the capacitor is respectively connected with an energy storage capacitor C1And a second switching tube S2Is connected with the drain electrode of the second switching tube S2Respectively with the energy storage device V2Positive pole and first switch tube S1Is connected with the drain electrode of the energy storage capacitor C1The other end of the first energy storage inductor is respectively connected with a second energy storage inductor L2And a second diode D2Is connected to the anode of a second diode D2Respectively with the energy storage device V2Negative electrode of (2) and first diode D1Is connected with the anode of the second energy storage inductor L2The other end of the filter is respectively connected with a filter capacitor C2Is connected to one end of a load R, the other end of the load R being connected to an input source V, respectively1Negative electrode of (1), first switching tube S1Source electrode of, the first diode D1Cathode and filter capacitor C2And the other end of the same.
As shown in fig. 5, a fifth two-switch three-port dc converter includes: input source V1Energy storage device V2A first switch tube S1A second switch tube S2A first diode D1A second diode D2A first energy storage inductor L1A second energy storage inductor L2And an energy storage capacitor C1Filter capacitor C2And a load R, wherein: first energy storage inductor L1One end of (1) and an input source V1Is connected with the positive pole of the first energy storage inductor L2The other end of the capacitor is respectively connected with an energy storage capacitor C1And a second switching tube S2Is connected with the drain electrode of the second switching tube S2Respectively with the energy storage device V2Negative pole of (2) and first switch tube S1Is connected with the drain electrode of the energy storage capacitor C1The other end of the first energy storage inductor is respectively connected with a second energy storage inductor L2And a second diode D2Is connected to the anode of a second diode D2Respectively with the energy storage device V2And a first diode D1Is connected to the anode of a first diode D1Are respectively connected to the filter capacitors C2And one end of a load R, the other end of the load R being connected to an input source V, respectively1Negative electrode of (1), first switching tube S1Source electrode of, second energy storage inductor L2Another terminal of (1) and a filter capacitor C2And the other end of the same.
As shown in fig. 6, a sixth two-switch three-port dc converter includes: input source V1Energy storage device V2A first switch tube S1A second switch tube S2A first diode D1A second diode D2A first energy storage inductor L1A second energy storage inductor L2And an energy storage capacitor C1Filter capacitor C2And a load R, wherein: first switch tube S1Drain and input source V of1Is connected to the positive pole of the first switching tube S1And the source and the second switch tube S2And energy storage device V2Is connected to the positive pole of the second switching tube S2Respectively with the first energy storage inductor L1One terminal of and an energy storage capacitor C1Is connected to an energy storage capacitor C1Are respectively connected to a second diode D2And the second energy storage inductor L2One terminal of (D), a second diode D2Respectively with an energy storage device V2Negative electrode of (2) and first diode D1Is connected to the cathode of a second energy-storing inductor L2The other end of the filter is respectively connected with a filter capacitor C2Is connected with one end of a load R, and the other end of the load R is respectively connected with an input source V1Negative pole, first energy storage inductance L1Another terminal of (1), a first diode D1Anode and filter capacitor C2And the other end of the same.
Wherein the last three converters add storageEnergy capacitor C1And a second energy storage inductor L2Compared with the first three converters, the three-phase inverter has the technical effects of smaller voltage constraint between ports, wider application range and continuous input/output current.
The control method of the two-switch three-port direct current converter comprises the following steps: input source V1Voltage sampled value v1And a reference value V1_refAfter error amplification, the signal is mixed with sawtooth wave vtComparing to generate a drive signal Vgs1Controlling a first switching tube S1(ii) a At the same time, the voltage sampling value v of the load RoAnd a reference value Vo_refAfter error amplification, the signal is mixed with sawtooth wave vtComparing to generate a drive signal Vgs2Controlling the second switch tube S2. The control method can be applied to the six two-switch three-port direct-current converters. In particular, as input source V1For new energy, the reference value V of the input voltage1_refFrom an input source V1Voltage sampled value v1And the input current sample value i1Obtained by MPPT (maximum power point tracking) algorithm.
The control method may adopt a control circuit as shown in fig. 7, including: an MPPT controller, a first error amplifier EA1, a second error amplifier EA2, a first comparator CMP1, and a second comparator CMP 2. The input end of the MPPT controller is connected with an input source V1Is sampled by a voltage v1And a sampling current i1An output terminal connected to one input terminal of a first error amplifier EA1, and the other input terminal of the first error amplifier EA1 connected to an input source V1Is sampled by a voltage v1An output terminal of the first error amplifier EA1 is connected to an input terminal of a first comparator CMP1, and another input terminal of the first comparator CMP1 is connected to the sawtooth wave vt. The input of the second error amplifier EA2 is connected to the sampled value v of the load voltageoAnd a reference value Vo_refAn output terminal of the second comparator CMP2 is connected to an input terminal of the second comparator CMP2, and another input terminal of the second comparator CMP2 is connected to the sawtooth wave vt. The output of the first comparator CMP1 is used as the driving signal V of the first switch tubegs1The output of the second comparator CMP2 is used as the secondDrive signal V of switch tubegs2By adjusting the first switching tube S1The duty ratio of the second switching tube S is adjusted to adjust the power of the input source2The duty cycle of (a) regulates the load voltage. Wherein the MPPT controller is used to obtain the input voltage reference value V1_refNormally for the input source V1Is the case of new energy.
Fig. 8 shows the generation of two possible switch drive signals after the use of the control circuit. Under the first switch driving signal, the first switch tube S1Is larger than the second switch tube S2On duty cycle of (d); under the second switch driving signal, the first switch tube S1Is smaller than the second switch tube S2On duty cycle of (d).
The first two-switch three-port DC converter requires an input source voltage v1Load voltage voAnd the voltage v of the energy storage device2Satisfies the relation vo<v1And v is2<v1. The second two-switch three-port DC converter requires an input source voltage v1Load voltage voAnd the voltage v of the energy storage device2Satisfies the relation vo>v1And v iso>v2. The third type of two-switch three-port DC converter requires an input source voltage v1Load voltage voAnd the voltage v of the energy storage device2Satisfies the relation v2<v1. Fourth two-switch three-port DC converter pair input source voltage v1Load voltage voAnd the voltage v of the energy storage device2There is no requirement. The fifth two-switch three-port DC converter requires an input source voltage v1Load voltage voAnd the voltage v of the energy storage device2Satisfies the relation v2<vo. The sixth two-switch three-port DC converter requires an input source voltage v1Load voltage voAnd the voltage v of the energy storage device2Satisfies the relation v2<v1。
The operation principle of the present invention will be described below by taking the two-switch three-port dc converter shown in fig. 2 as an example, and the operation principle of the other five two-switch three-port dc converters is similar to the above.
In the two-switch three-port DC converter shown in FIG. 2, the input source V1As the main power source of the system to provide energy for the load, a general photovoltaic cell, a fuel cell, etc. can be used as the input source V1When the maximum power that the input source can provide is greater than the power that the load needs, the energy storage device presents a charging state, and when the maximum power that the input source can provide is less than the power that the load needs, the energy storage device presents a discharging state. With the control circuit shown in fig. 7, the system is able to perform power flow control and management through the power relationship of the input source and the load.
Fig. 9 shows equivalent circuits corresponding to four possible switch states of the second two-switch three-port dc converter. Wherein, FIG. 9(a) shows the first switch tube S1And a second switching tube S2Equivalent circuit (state 1) when conducting at the same time, the energy storage inductance L passes through the input source V in the switch state1Charging; FIG. 9(b) shows the first switch tube S1Conducting the second switch tube S2Equivalent circuit when switched off (state 2), in which the energy storage inductance L is directed to the energy storage device V2Discharging; FIG. 9(c) shows the first switch tube S1Off, the second switching tube S2An equivalent circuit when switched on (state 3), in which the energy storage inductance L passes through the energy storage device V2Charging; FIG. 9(d) shows the first switch tube S1And a second switching tube S2While in the off state the equivalent circuit (state 4) is switched off, in which the inductor L discharges to the load R.
When the first switch tube S1Is larger than the second switch tube S2When the duty ratio is on (corresponding to the first switch driving signal shown in fig. 8), state 1, state 2, and state 4 occur in sequence in one switching period, and the energy storage device is in a charging state; when the first switch tube S1Is smaller than the second switch tube S2At the on duty cycle (corresponding to the second switch driving signal shown in fig. 8), state 1, state 3, and state 4 occur in sequence in one switching period, and the energy storage device is in a discharging state.
Performing time domain simulation analysis on the second two-switch three-port direct current converter by using PSIM simulation software, wherein an input source V1Adopting a photovoltaic cell model, wherein the maximum power point voltage of the photovoltaic cell is 25V, the maximum power point current is 2A-8A, and other system parameters are set as follows: the load power range is 50W-150W, and the voltage v of the energy storage equipment136V, load voltage Vo48V, filter capacitor C1000 muF, energy storage inductor L300 muH, and switching frequency FsThe system simulation results are as follows, 100 kHz.
Fig. 10 shows simulation results of a second two-switch three-port dc converter when the load jumps between 50W and 150W, where the maximum power point current of the photovoltaic cell is 5A, and it can be seen from the simulation results that when the load jumps, the photovoltaic cell always operates at its maximum power point, the load voltage is kept constant, when the load power is 50W, the energy storage device is in a charging state, and when the load power is 150W, the energy storage device is in a discharging state.
Fig. 11 shows a simulation result of the second two-switch three-port dc converter when the maximum power point current of the photovoltaic jumps between 2.5A and 6A, where the load is kept constant at 100W, and it can be seen from the simulation result that when the input jumps, the photovoltaic cell always operates at its maximum power point, the load voltage is kept constant, when the maximum power point current of the photovoltaic cell is 2.5A, the energy storage device is in a discharge state, and when the maximum power point current of the photovoltaic cell is 6A, the energy storage device is in a charge state.

Claims (10)

1. A two-switch three-port DC converter is characterized by comprising a first switch tube S1A second switch tube S2A first diode D1A second diode D2And an energy storage inductor L; s1Is connected to S2Of the drain electrode, S2Is connected to D2And one end of L, D2Is connected to D1A cathode of (a); s1Drain electrode of (1) and (D)1The anodes of (1) are respectively the positive and negative poles of the input terminal, S1Source electrode and D1Of a cathodeRespectively as positive and negative electrodes of energy storage terminal, another end of L and D1The anode of (a) is the positive electrode and the negative electrode of the load end respectively.
2. A two-switch three-port DC converter is characterized by comprising a first switch tube S1A second switch tube S2A first diode D1A second diode D2And an energy storage inductor L; one end of L is connected to S2Drain electrode of (1) and (D)2Of the anode, S2Is connected to S1Drain electrode of, D2Is connected to D1The anode of (1); the other end of L and S1The source electrodes of (1) are respectively the positive electrode and the negative electrode of the input end, D2And S1The drain electrodes of (A) are respectively the anode and the cathode of the energy storage end, D1And S1The source electrodes of (1) are respectively the anode and the cathode of the load end.
3. A two-switch three-port DC converter is characterized by comprising a first switch tube S1A second switch tube S2A first diode D1A second diode D2And an energy storage inductor L; s1Is connected to S2Of the drain electrode, S2Is connected to D1And one end of L, D1Is connected to D2A cathode of (a); s1And the other end of L is the positive and negative poles of the input end, S1Source electrode and D1The anodes of (A) are respectively the positive electrode and the negative electrode of the energy storage end, D2And the other end of the L is a positive electrode and a negative electrode of the load end respectively.
4. A two-switch three-port DC converter is characterized by comprising a first switch tube S1A second switch tube S2A first diode D1A second diode D2A first energy storage inductor L1A second energy storage inductor L2And an energy storage capacitor C1；L1Is connected at one end to S2Drain electrode of (1) and C1One end of (A), C1Is connected at the other end to D2And L2One end of (A), S2Is connected to S1Drain electrode of, D2Is connected to D1Anode of (D)1Is connected to S1A source electrode of (a); l is1And the other end of (1) and S1The source electrodes of (1) are respectively the positive electrode and the negative electrode of the input end, S2Source electrode and D2The cathodes of (A) are respectively the positive electrode and the negative electrode of the energy storage end, L2And another end of D1The cathodes of (a) are respectively the positive electrode and the negative electrode of the load end.
5. A two-switch three-port DC converter is characterized by comprising a first switch tube S1A second switch tube S2A first diode D1A second diode D2A first energy storage inductor L1A second energy storage inductor L2And an energy storage capacitor C1；L1Is connected at one end to S2Drain electrode of (1) and C1One end of (A), C1Is connected at the other end to D2And L2One end of (A), S2Is connected to S1Drain electrode of, D2Is connected to D1Anode of (2), L2Is connected at the other end to S1A source electrode of (a); l is1And the other end of (1) and S1The source electrodes of (1) are respectively the positive electrode and the negative electrode of the input end, D2And S2The source electrodes of (A) are respectively the anode and the cathode of the energy storage end, D1And L2The other ends of the two ends are respectively a positive electrode and a negative electrode of the load end.
6. A two-switch three-port DC converter is characterized by comprising a first switch tube S1A second switch tube S2A first diode D1A second diode D2A first energy storage inductor L1A second energy storage inductor L2And an energy storage capacitor C1；S1Is connected to S2Of the drain electrode, S2Is connected to L1And C and1one end of (A), C1Is connected at the other end to D2And L2At one end of the first and second arms,D2is connected to D1A cathode of (D)1Is connected to L1The other end of (a); s1And L is1The other ends of the two are respectively the positive pole and the negative pole of the input end, S1Source electrode and D2The anodes of (A) are respectively the anode and the cathode of the energy storage end, L2And another end of D1The anode of (a) is the positive electrode and the negative electrode of the load end respectively.
7. A control method for a two-switch three-port DC converter is characterized in that a sampling value v of an input voltage of the DC converter1And a reference value V1_refAfter error amplification, the signal is mixed with sawtooth wave vtComparing to generate a drive signal Vgs1Controlling a first switching tube of the direct current converter; at the same time, the sampled value v of the load voltage of the DC converteroAnd a reference value Vo_refAfter error amplification, the signal is mixed with sawtooth wave vtComparing to generate a drive signal Vgs2And controlling a second switching tube of the direct current converter.
8. The control method of claim 7, wherein the reference value V of the input voltage1_refFrom sampled values v of the input voltage of the DC converter1And the input current sample value i1Obtained by MPPT algorithm.
9. A control circuit of a two-switch three-port direct current converter is characterized by comprising a first error amplifier EA1, a second error amplifier EA2, a first comparator CMP1 and a second comparator CMP 2; the input end of the EA1 is used for inputting a sampled value v of the input voltage of the direct current converter1And a reference value V1_refThe output terminal is connected to the positive input terminal of the CMP 1; input end of EA2 is used for inputting sampled value v of load voltage of direct current converteroAnd a reference value Vo_refThe output terminal is connected to the positive input terminal of the CMP 2; the negative inputs of CMP1 and CMP2 are for inputting sawtooth wave vt(ii) a The output end of the CMP1 is used for connecting the grid electrode of a first switching tube of the DC converter, and the output end of the CMP2 is used for connecting a second switching tube of the DC converterAnd a grid electrode of the switching tube.
10. The control circuit of claim 9, further comprising an MPPT controller; the input end of the MPPT controller is used for inputting a sampling value v of the input voltage of the direct current converter1And the input current sample value i1And the output is connected to an input of EA 1.
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