CN107070273B - Multiport converter based on five-terminal impedance network and new energy system - Google Patents

Multiport converter based on five-terminal impedance network and new energy system Download PDF

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Publication number
CN107070273B
CN107070273B CN201710463958.8A CN201710463958A CN107070273B CN 107070273 B CN107070273 B CN 107070273B CN 201710463958 A CN201710463958 A CN 201710463958A CN 107070273 B CN107070273 B CN 107070273B
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switch tube
capacitor
storage device
inductor
energy storage
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CN107070273A (en
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张桂东
王志洋
陈思哲
李惜玉
章云
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Guangdong University of Technology
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Guangdong 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
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/28—Arrangements for balancing of the load in a network by storage of energy
    • H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E70/00—Other energy conversion or management systems reducing GHG emissions
    • Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention discloses a multiport converter based on a five-terminal impedance network and a new energy system, which comprise a diode, a first switch tube, a second switch tube, a first inductor and a second inductor, the diode is connected with the power module, the diode is further connected with a first end of the first inductor and the first capacitor respectively, a second end of the first inductor is connected with a first end of the second capacitor and a first end of the first switch tube respectively, a second end of the first switch tube is connected with a first end of a load or a power grid and a first end of the second switch tube respectively, a second end of the second switch tube is connected with the third capacitor, a first end of the second inductor and an anode of the energy storage device respectively, a second end of the second inductor is connected with a cathode of the energy storage device, a second end of the second capacitor and a cathode of the power module respectively, and the third capacitor is further connected with a second end of the load or the power grid and the first capacitor respectively. The invention has simple structure, easy control, high working efficiency and low cost.

Description

Multiport converter based on five-terminal impedance network and new energy system
Technical Field
The invention relates to the technical field of power electronics, in particular to a multi-port converter based on a five-terminal impedance network and a new energy system.
Background
With the gradual maturity of new energy technologies, a large number of new energy systems are put into power application, and users have higher and higher requirements on the performance of power electronic circuits in the new energy systems, such as efficiency, safety and the like.
In practical application, the new energy system has the problems of low output voltage and intermittent output of voltage. As shown in fig. 1 and fig. 2, fig. 1 is a schematic structural diagram of a new energy system provided in the prior art, and fig. 2 is a schematic structural diagram of another new energy system provided in the prior art.
In order to solve the problem of low output voltage of the new energy system, in the prior art, a DC/DC converter 2 and a DC/AC converter 3 are additionally added between a power module 1 and a load 4 or between the power module 1 and a power grid 4 of the new energy system, so as to boost the output voltage of the power module 1 to a voltage required by the load or a voltage of the power grid 4.
In order to solve the problem of intermittent output of the new energy system voltage, in the prior art, by adding the energy storage device 5, the new energy system can smoothly and stably output the voltage to the load 4 or the power grid 4 through the energy storage device 5 under the condition that the output voltage is insufficient. In addition, in order to realize the bidirectional energy flow between the energy storage device 5 and the new energy system, a bidirectional DC/DC converter 6 or a bidirectional DC/AC converter 7 needs to be added between the energy storage device 5 and an external device (for example, the power module 1 and the load 4 or between the power module 1 and the grid 4), when the output voltage of the new energy system is sufficient, the energy storage device 5 is charged through the bidirectional DC/DC converter 6 or the bidirectional DC/AC converter 7, and when the output voltage of the new energy system is insufficient, the energy storage device 5 outputs the voltage to the grid 4 or the load 4 through the bidirectional DC/DC converter 6 or the bidirectional DC/AC converter 7.
Therefore, in the prior art, the problems of low output voltage and intermittent output of the voltage of the new energy system are solved by adopting three converters, so that the whole new energy system has the problems of increased circuit levels, high cost, complex circuit structure, difficulty in control and low efficiency.
Therefore, how to provide a solution to the above technical problem is a problem that needs to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide a multi-port converter based on a five-terminal impedance network, which not only realizes the energy bidirectional flow of an energy storage device and a new energy system, but also can increase the output voltage of the new energy system to the voltage required by a load or the voltage of a power grid by controlling the duty ratio of two switching tubes.
In order to solve the above technical problem, the present invention provides a multiport converter based on a five-terminal impedance network, which is applied to a new energy system, and includes a diode, a first switch tube, a second switch tube, a first inductor, a second inductor, a first capacitor, a second capacitor, and a third capacitor, wherein:
the anode of the diode is connected with the anode of the power module, the cathode of the diode is respectively connected with the first end of the first inductor and the anode of the first capacitor, the second end of the first inductor is respectively connected with the positive electrode end of the second capacitor and the first end of the first switch tube, the second end of the first switch tube is respectively connected with the first end of a load or a power grid and the first end of the second switch tube, the second end of the second switch tube is respectively connected with the negative electrode end of the third capacitor, the first end of the second inductor and the anode of the energy storage device, the second end of the second inductor is respectively connected with the negative electrode of the energy storage device, the negative electrode end of the second capacitor and the negative electrode of the power module, the positive end of the third capacitor is respectively connected with the second end of the load or the power grid and the negative end of the first capacitor;
the first end and the second end of the first switch tube are both non-control ends, and the first end and the second end of the second switch tube are both non-control ends.
Preferably, the capacitance value of the second capacitor is equal to the capacitance value of the first capacitor connected in series with the third capacitor.
Preferably, an inductance value of the first inductor is equal to an inductance value of the second inductor.
Preferably, when the duty ratio D of the first switch tube is1Not less than 0.5, the duty ratio D of the second switch tube2At 0.5, the voltage at the first end of the load or the network is
Figure GDA0002282813260000021
The voltage at the second end of the load or the grid is
Figure GDA0002282813260000022
The voltage of the positive pole of the energy storage device is
Figure GDA0002282813260000031
The voltage of the negative electrode of the energy storage device is
Figure GDA0002282813260000032
Wherein, VdIs the output voltage of the power supply module.
Preferably, the first switch tube and the second switch tube are both NMOS, wherein the first end of the first switch tube and the first end of the second switch tube are both drain electrodes of the NMOS, and the second end of the first switch tube and the second end of the second switch tube are both source electrodes of the NMOS.
Preferably, the first switch tube and the second switch tube are both IGBTs, wherein the first end of the first switch tube and the first end of the second switch tube are both collectors of the IGBTs, and the second end of the first switch tube and the second end of the second switch tube are both emitters of the IGBTs.
In order to solve the technical problem, the invention further provides a new energy system, which comprises a power module, an energy storage device, a load or a power grid, and the multi-port converter based on the five-terminal impedance network.
Preferably, the power module is a solar panel.
Preferably, the energy storage device is a super capacitor or a battery energy storage device.
The invention provides a multiport converter based on a five-terminal impedance network, which is applied to a new energy system and comprises a diode, a first switch tube, a second switch tube, a first inductor, a second inductor, a first capacitor, a second capacitor and a third capacitor, wherein:
the anode of the diode is connected with the anode of the power module, the cathode of the diode is respectively connected with the first end of the first inductor and the anode of the first capacitor, the second end of the first inductor is respectively connected with the anode of the second capacitor and the first end of the first switch tube, the second end of the first switch tube is respectively connected with the first end of the load or the power grid and the first end of the second switch tube, the second end of the second switch tube is respectively connected with the cathode of the third capacitor, the first end of the second inductor and the anode of the energy storage device, the second end of the second inductor is respectively connected with the cathode of the energy storage device, the cathode of the second capacitor and the cathode of the power module, and the anode of the third capacitor is respectively connected with the second end of the load or the power grid and the cathode of the first capacitor.
It can be seen that the impedance network is formed by the first inductor, the second inductor, the first capacitor, the second capacitor and the third capacitor in the multiport converter based on the five-terminal impedance network, which is provided by the invention, and the duty ratio of the two switching tubes is controlled, so that the energy bidirectional flow of the energy storage device and the new energy system is realized, and the output voltage of the new energy system can be increased to the voltage required by the load or the voltage of a power grid, compared with the prior art that three converters are adopted to solve the problems of lower output voltage and intermittent output of voltage of the new energy system, the impedance network of the multiport converter based on the five-terminal impedance network and the half-bridge converter share one capacitor bridge arm, the circuit structure is greatly simplified, the circuit level is reduced, the problems can be solved only by controlling the duty ratios of the two switching tubes, and the control mode is simple, the circuit work efficiency of the new energy system is improved, and the cost is reduced.
The invention also provides a new energy system which has the beneficial effects of the multi-port converter based on the five-terminal impedance network.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed in the prior art and the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a new energy system provided in the prior art;
fig. 2 is a schematic structural diagram of another new energy system provided by the prior art;
fig. 3 is a schematic structural diagram of a multiport converter based on a five-terminal impedance network according to the present invention;
FIG. 4 is a waveform diagram illustrating operation of one embodiment of a five-terminal impedance network-based multi-port converter in a first operation mode;
fig. 5 is a schematic diagram of an operation process of an embodiment of the multi-port converter based on a five-terminal impedance network according to the present invention in a first operation mode when a first switch tube is turned on and a second switch tube is turned off;
fig. 6 is a schematic diagram of an operation process of an embodiment of the multi-port converter based on a five-terminal impedance network according to the present invention in a first operation mode when both the first switch transistor and the second switch transistor are turned on;
fig. 7 is a schematic diagram of an operation process of an embodiment of the multi-port converter based on a five-terminal impedance network in a first operation mode when a first switch tube is turned off and a second switch tube is turned on;
fig. 8 is a schematic diagram of a working process of the multi-port converter based on the five-terminal impedance network in a second working mode when the first switch tube is turned on and the second switch tube is turned off;
fig. 9 is a schematic diagram of a working process of the multi-port converter based on the five-terminal impedance network in the second working mode when both the first switch tube and the second switch tube are turned on;
fig. 10 is a schematic diagram of a working process of the multi-port converter based on the five-terminal impedance network according to the present invention when the first switch tube is turned off and the second switch tube is turned on in the second working mode;
fig. 11 is a schematic diagram of a working process of the multi-port converter based on the five-terminal impedance network according to the present invention in a third working mode, where the first switching tube is turned on and the second switching tube is turned off;
fig. 12 is a schematic diagram of a working process of the multi-port converter based on the five-terminal impedance network according to the present invention when the first switch tube is turned off and the second switch tube is turned on in a third working mode;
fig. 13 is a schematic diagram of an operation process of another embodiment of the multiport converter based on the five-terminal impedance network according to the present invention in the first operation mode when both the first switch transistor and the second switch transistor are turned on;
fig. 14 is a schematic diagram of an operation process of another embodiment of the multiport converter based on the five-terminal impedance network according to the present invention in the first operation mode when the first switch tube is turned on and the second switch tube is turned off;
fig. 15 is a schematic diagram of an operation process of another embodiment of the multiport converter based on the five-terminal impedance network according to the present invention in the first operation mode when the first switch is turned off and the second switch is turned on;
fig. 16 is a waveform diagram illustrating the operation of another embodiment of the multiport converter based on the five-terminal impedance network according to the present invention in the first operation mode.
Detailed Description
The core of the invention is to provide a multi-port converter based on a five-terminal impedance network, which not only realizes the energy bidirectional flow of an energy storage device and a new energy system, but also can increase the output voltage of the new energy system to the voltage required by a load or the voltage of a power grid by controlling the duty ratio of two switching tubes, and the impedance network formed by a first inductor, a second inductor, a first capacitor, a second capacitor and a third capacitor shares a capacitor bridge arm with a half-bridge converter.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 3, fig. 3 is a schematic structural diagram of a multiport converter based on a five-terminal impedance network, which is applied to a new energy system and includes a diode D and a first switching tube S1A second switch tube S2A first inductor L1A second inductor L2A first capacitor C1A second capacitor C2And a third capacitor C3Wherein:
the anode of the diode D is connected with the anode of the power module, and the cathode of the diode D is respectively connected with the first inductor L1First terminal and first capacitor C1Is connected to a first terminal of a first inductor L1Respectively with a second capacitor C2First end and first switch tube S1Is connected with a first end of a first switch tube S1With the first end of the load or the grid and the second switching tube S, respectively2Is connected with the first end of the second switch tube S2Respectively with a third capacitor C3First terminal, second inductance L2The first end of the first inductor L is connected with the anode of the energy storage device, and the second inductor L2The second end of the capacitor is respectively connected with the negative electrode of the energy storage device and the second capacitor C2The second end of the third capacitor C is connected with the negative electrode of the power supply module3With the second end of the load or grid and the first capacitor C, respectively1Is connected to the second end of the first housing.
In particular, the first inductance L1A second inductor L2A first capacitor C1A second capacitor C2And a third capacitor C3Forming an impedance network, a first capacitor C1A third capacitor C3A first switch tube S1And a second switch tube S2Forming a half-bridge converter, the impedance network and the half-bridge converter sharing a first capacitor C1And a third capacitance C3The formed capacitor bridge arm simplifies the circuit structure.
In the application, the energy of the energy storage device and the new energy system can flow in two directions by controlling the duty ratio of the two switching tubes, and the output voltage of the new energy system is increased to the voltage required by a load or the voltage of a power grid.
In addition, the diode D has one-way conductivity, can prevent the current in the impedance network from flowing back to the power module, and plays a role in protecting the circuit.
The impedance network of the multiport converter based on the five-terminal impedance network and the half-bridge converter share one capacitor bridge arm, so that the circuit structure is greatly simplified, the circuit level is reduced, the problems can be solved by only controlling the duty ratios of the two switching tubes, the control mode is simple, the circuit working efficiency of the new energy system is improved, and the cost is reduced.
As a preferred embodiment, the second capacitor C2Is equal to the first capacitance C1And a third capacitor C3Capacitance value of the series.
As a preferred embodiment, the first inductance L1Is equal to the second inductance L2The inductance value of (c).
In practical applications, in order to reduce the harmonic content in the output waveform of the half-bridge inverter, the second capacitor C may be used2Is equal to the first capacitance C1And a third capacitor C3Capacitance of series (series only in the form of a connection), i.e. C2＝C1//C3First inductance L1Is equal to the second inductance L2The inductance value of, i.e. L1＝L2In this condition, the impedance network is a symmetric network.
As a preferred embodiment, when the first switch tube S1Duty ratio D of1Not less than 0.5, the second switch tube S2Duty ratio D of2At 0.5, the voltage at the first end of the load or grid is
Figure GDA0002282813260000071
The voltage at the second end of the load or grid is
Figure GDA0002282813260000072
The voltage of the positive pole of the energy storage device isThe voltage of the negative electrode of the energy storage device is
Figure GDA0002282813260000074
Wherein, VdIs the output voltage of the power supply module.
Specifically, taking a power module as an example of a solar panel, a multi-port converter based on a five-terminal impedance network has three working modes, which are respectively:
a first operating mode: when the illumination is sufficient, the solar panel provides electric energy for the energy storage device and the load or the energy storage device and the power grid;
a second working mode: when the illumination is insufficient, the solar cell panel provides electric energy for the load or the power grid, and the energy storage device also provides electric energy for the load or the power grid;
the third working mode is as follows: when no light is emitted, the solar panel does not provide electric energy to the outside, and the energy storage device provides electric energy for the load or the power grid.
Taking the multi-port converter based on the five-terminal impedance network as an example to work in the first working mode, the working process of the multi-port converter based on the five-terminal impedance network is described as follows:
specifically, a first switch tube S is set1And a second switching tube S2With a switching period of T, a first switching tube S1Duty ratio of D1A second switch tube S2Duty ratio of D2The voltage of the power supply module is VdFirst inductance L1A second inductor L2A first capacitor C1A second capacitor C2And a third capacitor C3Respectively at a voltage of VL1、VL2、VC1、VC2And VC3First inductance L1And a second inductance L2Average of (2)Current is IL。
In a first mode of operation, one of the embodiments, setting D1≥0.5，D2＝0.5。
When the circuit works in a steady state, the multi-port converter based on the five-terminal impedance network mainly has 3 working modes in one switching period, and the first switching tube S1On time of D1T, a second switch tube S2On time of D2T, the conducting state of the switching tube is as shown in fig. 4, and fig. 4 is a waveform diagram of the operation of the multi-port converter based on the five-terminal impedance network in the first operation mode. The working process of the multi-port converter based on the five-terminal impedance network in the first working mode is as follows:
working mode 1: t is t0～t1
As shown in fig. 5, fig. 5 shows that the multi-port converter based on the five-terminal impedance network provided by the present invention operates in the first operating mode at the first switch tube S1Second switch tube S2The working process schematic diagram when the converter is switched off (the solid line represents a part through which current flows in the converter, the dotted line represents a part through which no current flows in the converter, and the same principle is shown in the figures 6-15); first switch tube S1On, the second switch tube S2Off, the working mode 1 duration is (1-D)2) And T. First inductance L1Through Vd-D-L1-C2Loop discharge, first inductance L1Current i ofL1The linearity decreases. Second inductance L2Through Vd-D-C1-C3-L2Loop discharge, second inductance L2Current i ofL2The linearity decreases. For node 5 column KCL equation in fig. 5: i.e. iC3＝IL-iR2-，R2Represents an energy storage device, iR2-Representing the current flowing through the energy storage device, for node 3 columns of KCL equations: i.e. iC1＝iC3-iZ1+＝(IL-iR2-)-iZ1+＝IL-iR2--iZ1+，Z1Representing the load or the grid, iZ1+Representing the current through the load or grid, as can be seen from the analysis of fig. 5, when firstInductor L1Voltage V ofL1＝Vd-VC2A second inductor L2Voltage V ofL2＝Vd-(VC1+VC3) And due to C2＝C1//C3，L1＝L2The novel impedance network is a symmetrical network and comprises: vL1＝VL2，VC2＝VC1+VC3. Second capacitance C2 is through C2-Z1-C3-L2The loop transfers the electric energy to the load or the power grid, at which time the voltage V of the load or the power gridO1+＝VC2-(Vd-VC1). Power supply module passing Vd-R2The loop transfers the electric energy to the energy storage device, and the voltage V of the energy storage device is obtained at the momentO2-＝Vd-(VC1+VC3)。
And (3) working mode 2: t is t1～t2
As shown in fig. 6, fig. 6 shows that the multi-port converter based on the five-terminal impedance network provided by the present invention operates in the first operating mode at the first switch tube S1And a second switch tube S2Schematic diagram of working process when all are on; first switch tube S1And a second switch tube S2All are switched on to form a through mode, and the working mode 2 has the duration of (D)1+D2-1) T. A first capacitor C1And a third capacitance C3Through a first switch tube S1And a second switching tube S2Formed straight-through bridge arm and first inductor L1Form a loop to the first inductor L1Charging, first inductance L1Current iL1And (4) linear growth. Second capacitor C2Through a direct bridge arm and a second inductor L2Form a loop and feed the second inductor L2Charging, second inductance L2Current iL2And (4) linear growth. A first capacitor C1Current i ofC1＝-ILFor node 3 of FIG. 6, column KCL equation: i.e. iC3＝iC1-iZ1-＝-(IL+iZ1-) As can be seen from the analysis of fig. 6, the first inductor L is now located at the first position1Voltage V ofL1And a first capacitor C1And a third capacitance C3Voltage V after series connectionC1+VC3Equal, second inductance L2Voltage VL2And a second capacitor C2Voltage VC2Are equal. And due to C2＝C1//C3，L1＝L2The novel impedance network is a symmetrical network and comprises: vL1＝VL2，VC1+VC3＝VC2Therefore, the following are: vL1＝VL2＝VC1+VC3＝VC2. Third capacitor C3Through C3-Z1The loop transfers the electric energy to the load or the power grid, at which time the voltage V of the load or the power gridO1-＝-VC3. Second capacitor C2Through C2-R2The loop transfers the electric energy to the energy storage device, and the voltage V of the energy storage device is obtained at the momentO2+＝VC2。
Working mode 3: t is t2～t3
As shown in fig. 7, fig. 7 shows that the multi-port converter based on the five-terminal impedance network provided by the present invention operates in the first operating mode at the first switch tube S1A second switch tube S2Schematic diagram of working process at startup; first switch tube S1A second switch tube S2Opening, the working mode 3 duration is (1-D)1) And T. First inductance L1Through Vd-D-L1-C2Loop discharge, first inductance L1Current iL1The linearity decreases. Second inductance L2Through Vd-D-C1-C3-L2Loop discharge, second inductance L2Current iL2The linearity decreases. For node 5 column KCL equation in fig. 7: i.e. iC3＝IL-iZ1--iR2-For node 3 column KCL equation in fig. 7: i.e. iC1＝iC3+iZ1-＝IL-iR2-As can be seen from the analysis of fig. 7, the first inductor L is now located at the first position1Voltage VL1＝Vd-VC2A second inductor L2Voltage VL2＝Vd-(VC1+VC3) And due to C2＝C1//C3，L1＝L2The novel impedance network is a symmetrical network and comprises: vL1＝VL2，VC1+VC3＝VC2. At this time, the voltage V of the load or the power gridO1-＝-VC3. Power supply module passing Vd-R2-L2The loop transfers the electric energy to the energy storage device, and the voltage V of the energy storage device is obtained at the momentO2-＝Vd-(VC1+VC3)。
According to the above analysis, the time period for which the voltage of the load or grid is positive is t0～t1Duration t1+Is (1-D)2) T, the time period when the voltage of the load or the power grid is negative is T1～t3Duration t1-Is (D)1+D2-1)T+(1-D1)T＝D2And T. Due to the operation in the first mode, D is set2When t is 0.5, t1+＝t1-Therefore, the voltage of the load or the grid is an alternating voltage with alternating positive and negative voltages and equal duration, which can be used as grid-connected output or provide a required voltage for the load, and besides the above-mentioned manner, the voltage grid-connected output can be realized, and the voltage grid-connected output can also be realized by a control manner of SPWM (Sinusoidal Pulse Width Modulation) or SVPWM (Space Vector Pulse Width Modulation), which is not limited here.
The time period t during which the voltage of the energy storage device is positive1～t2Duration t2+Is (D)1+D2-1) T, the period of time T during which the energy storage device voltage is negative0～t1Duration t2-Is (1-D)2)T+(1-D1)T＝(1-D1-D2) And T. Due to the operation in the first mode, D is set2When t is 0.5, t2+≠t2-Therefore, the voltage of the energy storage device is the voltage with the alternating positive voltage and negative voltage and unequal duration, and the energy storage device can be charged.
According to the volt-second balance principle of the inductor, a volt-second balance equation is written for the first inductor L1 column:
Figure GDA0002282813260000101
(Vd-VC2)×(1-D2)T+(VC1+VC3)×(D1+D2-1)T+(Vd-VC2)×(1-D1)T＝0 (2)
obtaining by solution:
Figure GDA0002282813260000102
Figure GDA0002282813260000103
according to the ampere-second balance (charge balance) principle of the capacitor, an ampere-second balance equation is written for the first capacitor C1 column:
Figure GDA0002282813260000104
Figure GDA0002282813260000105
the method is simplified to obtain:
Figure GDA0002282813260000106
according to ampere-second balance (charge balance) principle of capacitor, for third capacitor C3Column write ampere-second equilibrium equation:
Figure GDA0002282813260000107
Figure GDA0002282813260000108
the method is simplified to obtain:
Figure GDA0002282813260000109
combining formula (6) and formula (9) to obtain:
Figure GDA00022828132600001010
namely:
D2VO1+＝-(1-D2)VO1-(11)
namely:
D2(VC2-(Vd-VC1))＝(1-D2)VC3(12)
will VC1+VC3＝VC2Formula (12) is substituted to solve for the voltage of the load or the grid:
Figure GDA0002282813260000111
Figure GDA0002282813260000112
for the voltage of the energy storage device, through the above analysis, there are:
Figure GDA0002282813260000113
Figure GDA0002282813260000114
according to D set in the first working mode1、D2Value of (1) or less D1+D2< 1.5, the peak value of the voltage of the load or grid can be greater than V, which is obtainable according to equations (13) and (14)dAnd may be smaller than VdThe voltage rising and the voltage falling of the multi-port converter based on the five-terminal impedance network can be realized. In this mode, D20.5, so there is VO1+＝VO1-According to equations (15) and (16), the peak value of the voltage of the energy storage device may be larger than VdAnd may be smaller than VdThe multi-port converter based on the five-terminal impedance network can be boosted,And (5) reducing the pressure. With D1＝0.75，D2For example, 0.5, the waveform shown in fig. 4 is obtained.
The working flow diagrams of the multi-port converter based on the five-terminal impedance network working in the second working mode are shown in fig. 8, 9 and 10, and fig. 8 is a first switch tube S of the multi-port converter based on the five-terminal impedance network provided by the invention1Second switch tube S2Fig. 9 is a schematic diagram of the working process of the multi-port converter based on the five-terminal impedance network according to the present invention at the first switch tube S1And a second switch tube S2Fig. 10 is a schematic diagram of the working process of the multi-port converter based on the five-terminal impedance network according to the present invention at the first switch tube S1A second switch tube S2Schematic diagram of the operation process of the switch-on.
Fig. 11 and 12 show the working flow chart of the multi-port converter based on the five-terminal impedance network operating in the third working mode, where fig. 11 is the first switch tube S of the multi-port converter based on the five-terminal impedance network provided by the present invention1Second switch tube S2Fig. 12 is a schematic diagram of a switching-off operation process of the multi-port converter based on the five-terminal impedance network according to the present invention, and is shown in the first switch tube S1A second switch tube S2Schematic diagram of the operation process of the switch-on.
The working process of the multi-port converter based on the five-terminal impedance network in the second working mode and the third working mode is substantially the same as the working process of the multi-port converter based on the five-terminal impedance network in the first working mode, and the description thereof is omitted.
Below with D1＝0.5，D2The working process of the multi-port converter based on the five-terminal impedance network in the first working mode of another embodiment is described as the example that the multi-port converter is greater than or equal to 0.5:
as shown in fig. 13, 14 and 15, fig. 13 is a first switch tube S of the multi-port converter based on the five-terminal impedance network provided by the invention1And a second switch tube S2Schematic diagram of working process when all are on, FIG. 14 is a schematic diagram of the present inventionMulti-port converter based on five-terminal impedance network and provided with a first switch tube S1Second switch tube S2Fig. 15 is a schematic diagram of the operation process of the multi-port converter based on the five-terminal impedance network according to the present invention at the first switch tube S1A second switch tube S2Schematic diagram of working process at startup; when the circuit works in a steady state, the multi-port converter based on the five-terminal impedance network mainly has 3 working modes in one switching period, and the first switching tube S1On time of D1T, a second switch tube S2On time of D2And T, the voltage of the load or the power grid in the working mode is asymmetric voltage, namely the duration of the positive voltage and the negative voltage is unequal. The working process of the working mode and the multi-port converter based on the five-terminal impedance network work in the first working mode setting D1≥0.5，D2In one embodiment of 0.5, the voltages of the load or the power grid are positive and negative voltages alternately, and the same ac voltages with the same duration are obtained, but the sequence is different, and the expressions of formula (17), formula (18), formula (19), and formula (20) can be obtained as well, and are not described again here.
Figure GDA0002282813260000121
Figure GDA0002282813260000122
Figure GDA0002282813260000123
Figure GDA0002282813260000124
Taking D1 being 0.5 and D2 being 0.75 as an example, a waveform diagram as shown in fig. 16 is obtained, and fig. 16 is an operation waveform diagram of another embodiment of the five-terminal impedance network-based multi-port converter provided by the present invention in the first operation mode.
As a preferred embodiment, the firstSwitch tube S1And a second switch tube S2Are all NMOS, wherein, the first switch tube S1First end of and a second switch tube S2The first end of the first switch tube S is the drain electrode of the NMOS1Second terminal and second switch tube S2And the second ends of the first and second transistors are both sources of the NMOS.
As a preferred embodiment, the first switch tube S1And a second switch tube S2Are all IGBT, wherein, the first switch tube S1First end of and a second switch tube S2The first ends of the first and second switching tubes S and S are all IGBT collectors1Second terminal and second switch tube S2And the second ends of the first and second terminals are emitters of the IGBT.
Specifically, the NMOS has the advantages of high switching speed and low switching loss, and the IGBT has the advantage of high withstand voltage rating. Besides the two kinds of switching tubes, the switching tubes may also be other switching tubes such as PMOS and the like which can achieve the purpose of the present invention, and are not limited herein.
The invention provides a multiport converter based on a five-terminal impedance network, which is applied to a new energy system and comprises a diode, a first switch tube, a second switch tube, a first inductor, a second inductor, a first capacitor, a second capacitor and a third capacitor, wherein the anode of the diode is connected with the anode of a power module, the cathode of the diode is respectively connected with the first end of the first inductor and the anode of the first capacitor, the second end of the first inductor is respectively connected with the anode of the second capacitor and the first end of the first switch tube, the second end of the first switch tube is respectively connected with the first end of a load or a power grid and the first end of the second switch tube, the second end of the second switch tube is respectively connected with the cathode of the third capacitor, the first end of the second inductor and the anode of an energy storage device, the second end of the second inductor is respectively connected with the cathode of the energy storage device, the cathode of the second capacitor and the cathode of the power module, and the positive end of the third capacitor is respectively connected with the second end of the load or the power grid and the negative end of the first capacitor.
It can be seen that the impedance network is formed by the first inductor, the second inductor, the first capacitor, the second capacitor and the third capacitor in the multiport converter based on the five-terminal impedance network, which is provided by the invention, and the duty ratio of the two switching tubes is controlled, so that the energy bidirectional flow of the energy storage device and the new energy system is realized, and the output voltage of the new energy system can be increased to the voltage required by the load or the voltage of a power grid, compared with the prior art that three converters are adopted to solve the problems of lower output voltage and intermittent output of voltage of the new energy system, the impedance network of the multiport converter based on the five-terminal impedance network and the half-bridge converter share one capacitor bridge arm, the circuit structure is greatly simplified, the circuit level is reduced, the problems can be solved only by controlling the duty ratios of the two switching tubes, and the control mode is simple, the circuit work efficiency of the new energy system is improved, and the cost is reduced.
The invention also provides a new energy system, which comprises a power supply module, an energy storage device, a load or a power grid, and the multi-port converter based on the five-terminal impedance network.
As a preferred embodiment, the power module is a solar panel.
Specifically, solar cell panel has and turns into the electric energy with light energy, the characteristics of pollution abatement, and power module can be except that solar cell panel, can also be other devices that can provide the electric energy for the system such as generator.
As a preferred embodiment, the energy storage device is a super capacitor or a battery energy storage device.
Specifically, the super capacitor has the advantages of long service life, safety, environmental protection.
For the introduction of the new energy system provided by the present invention, please refer to the above embodiments, which are not repeated herein.
It is further noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (9)

1. The utility model provides a multiport converter based on five terminal impedance networks, is applied to new energy system, its characterized in that includes diode, first switch tube, second switch tube, first inductance, second inductance, first electric capacity, second electric capacity and third electric capacity, wherein:
the anode of the diode is connected with the anode of the power module, the cathode of the diode is respectively connected with the first end of the first inductor and the anode of the first capacitor, the second end of the first inductor is respectively connected with the positive electrode end of the second capacitor and the first end of the first switch tube, the second end of the first switch tube is respectively connected with the first end of a load or a power grid and the first end of the second switch tube, the second end of the second switch tube is respectively connected with the negative electrode end of the third capacitor, the first end of the second inductor and the anode of the energy storage device, the second end of the second inductor is respectively connected with the negative electrode of the energy storage device, the negative electrode end of the second capacitor and the negative electrode of the power module, the positive end of the third capacitor is respectively connected with the second end of the load or the power grid and the negative end of the first capacitor;
the first end and the second end of the first switch tube are both non-control ends, and the first end and the second end of the second switch tube are both non-control ends.
2. The multi-port converter according to claim 1, wherein the capacitance of the second capacitor is equal to the capacitance of the first capacitor in series with the third capacitor.
3. The multi-port converter according to claim 2, wherein an inductance value of the first inductor is equal to an inductance value of the second inductor.
4. The multiport converter according to claim 3, wherein the power supply module is a solar panel, the solar panel being in a first operating mode, wherein the solar panel provides power to the energy storage device and the load, or to the energy storage device and the grid, when solar energy is sufficient in the first operating mode;
when the duty ratio D of the first switch tube1Not less than 0.5, the duty ratio D of the second switch tube2At 0.5, the voltage at the first end of the load or the network is
Figure FDA0002282813250000011
The voltage at the second end of the load or the grid is
Figure FDA0002282813250000012
The voltage of the positive pole of the energy storage device is
Figure FDA0002282813250000013
The voltage of the negative electrode of the energy storage device is
Figure FDA0002282813250000014
Wherein,Vdis the output voltage of the power supply module.
5. The multiport converter according to any of claims 1-4, wherein the first switch tube and the second switch tube are both NMOS, and wherein the first end of the first switch tube and the first end of the second switch tube are both drain electrodes of NMOS, and the second end of the first switch tube and the second end of the second switch tube are both source electrodes of NMOS.
6. The multi-port converter according to claim 1, wherein the first switch tube and the second switch tube are both IGBTs, wherein the first end of the first switch tube and the first end of the second switch tube are both collectors of the IGBTs, and the second end of the first switch tube and the second end of the second switch tube are both emitters of the IGBTs.
7. A new energy system comprising a power supply module and an energy storage device, and further comprising a load or a power grid, characterized by further comprising a five-terminal impedance network based multiport converter according to any of claims 1-6.
8. The new energy system according to claim 7, wherein the power module is a solar panel.
9. The new energy system as claimed in claim 8, wherein the energy storage device is a super capacitor or a battery energy storage device.
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CN206211839U (en) * 2016-08-26 2017-05-31 广东工业大学 A kind of symmetric form dual output Z source converters
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