CN115498619A - Direct current micro-grid group flexible interconnection system based on differential current compensation - Google Patents
Direct current micro-grid group flexible interconnection system based on differential current compensation Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
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Abstract
Direct current microgrid crowd flexible interconnection system based on difference current compensation belongs to the power electronics field. From n (n)>1) A DC microgrid of 2n diodes D 11 ～D n1 、D 12 ～D n2 2n switching tubes S 11 ～S n1 、S 12 ～S n2 1 inductor L 1 And a differential current compensation three-port circuit. The interconnection system can process power exchange among different micro networks by only needing fewer elements, so that the system is low in cost and small in size. Diode D 11 ～D n1 、D 12 ～D n2 And a switching tube S 11 ～S n1 、S 12 ～S n2 The voltage stress of (2) is low; in addition, different differential current compensation three-port circuit implementation schemes are provided, and the method is suitable for different application scenarios.
Description
Technical Field
The invention belongs to the field of power electronics, and particularly relates to a direct-current micro-grid group flexible interconnection system based on differential current compensation.
Background
Under the background of a double-high system, the number of direct-current micro-grids formed by distributed new energy resources is increased more and more. The direct-current microgrid groups are connected together in a certain mode, so that energy mutual aid among microgrid systems is realized, and the stability of the microgrid systems is improved (Wangxanbao, wangwei, menina, and the like. The unified control strategy for the off-grid and on-grid operation of the direct-current microgrid [ J ]. Chinese Motor engineering report 2015, 35 (17): 4388-4396.). The direct-current microgrid is connected with a bidirectional DC/DC converter in parallel and then connected to a common direct-current bus, and the direct-current microgrid is the most intuitive interconnection scheme (Liuhaitao, bear, quyu, wuming, lipisti, sun Lijing, the cluster control research of a multi-microgrid system under direct-current power distribution [ J ]. The report of China Motor engineering, 2019,39 (24): 7159-7167.). However, in the interconnection mode, each bidirectional DC/DC converter is directly connected in parallel with the DC microgrid, and all power of the microgrid needs to be converted, which results in a large size and high cost of the converter. Based on the above, a student provides a serial direct current microgrid group flexible interconnection architecture (chenguipeng, a serial direct current microgrid group flexible interconnection architecture [ P ]. Fujian province: CN114744607A, 2022-07-12.), and each direct current microgrid is connected with a bidirectional DC/DC converter in series and then connected to a direct current bus, so that differential power processed by the bidirectional DC/DC converters is reduced, and the power density and the system cost of a direct current microgrid group flexible interconnection system are effectively improved. However, this approach still requires a large number of bidirectional DC/DC converters to handle the power transfer between the micro grids, and the system is still large and costly. Therefore, new and improved technical solutions are urgently sought.
Disclosure of Invention
The invention aims to provide a direct-current micro-grid group flexible interconnection system based on differential current compensation, which can realize free power exchange of a direct-current micro-grid group by using fewer elements and aims to overcome the defects of large quantity of bidirectional DC/DC converters, large volume, high cost and the like of the conventional direct-current micro-grid group flexible interconnection system.
A direct current micro-grid group flexible interconnection system based on differential current compensation comprises n direct current micro-grids (n)>1) 2n diodes D 11 ～D n1 、D 12 ～D n2 2n switching tubes S 11 ～S n1 、S 12 ～S n2 1 inductor L 1 And a differential current compensation three-port circuit; the negative ends of the n direct current micro-grids are connected to a node GND together, and the positive ends of the n direct current micro-grids are respectively connected with a diode D 11 ～D n1 Anode and switching tube S 12 ～S n2 One end of the two is connected; diode D 11 ～D n1 Respectively with a switching tube S 11 ～S n1 Is connected with one end of a switch tube S 11 ～S n1 Another end of (1) and an inductor L 1 Is connected to node a, inductor L 1 Another terminal of (D) and diode D 12 ～D n2 Is connected to the node b, and a diode D 12 ～D n2 Respectively with a switching tube S 12 ～S n2 The other ends of the two are connected; differential current compensation three-port circuit is by electric capacity C h 、C l Switching tube S h 、S l Diode D h 、D l And a bidirectional DC converter; capacitor C h Respectively pass through a switch tube S h And a diode D h A capacitor C connected to the node a and the node b l Respectively pass through diode D l And a switching tube S l Connected to the node a and the node b, a capacitor C h And a capacitor C l Are all connected to the node GND.
Capacitor C h Capacitor C l Can be connected by different types of bidirectional direct current converters, and the different types of bidirectional direct current converters can adopt a structure containing an inductor L 2 And a switch tube S 1 And a switching tube S 2 The bidirectional buck/boost converter of (1), wherein the inductor L 2 One terminal of and a capacitor C l Is connected with the positive pole of the inductor L 2 The other end of the switch tube S 1 、S 2 Is connected to switch tube S 1 Is connected to the capacitor C at the other end h Positive electrode of (2), switching tube S 2 And the other end thereof is connected to the node GND.
The capacitor C in the differential current compensation three-port circuit l Can be deleted, and can utilize conducting wire to replace switch tube S l Delete diode D l Or using wires instead of diodes D l The switch tube S is deleted l 。
The capacitor C in the differential current compensation three-port circuit h Can be deleted, and at the same time, the conducting wire can be used to replace the switch tube S h Delete diode D h Or using wires instead of diodes D h The switch tube S is deleted h 。
Capacitor C in the differential current compensation three-port circuit l Can be eliminated and the diode D can be used a Switch tube S a Instead of diode D l By means of a diode D b Switch tube S b Replacing the switch tube S l (ii) a Wherein, the diode D a Cathode and switching tube S b One end of which is connected to the original capacitor C l At the anode position of diode D a Anode and switch tube S a Is connected to switch tube S a Is connected to the node a, a switching tube S b Another terminal of (1) and a diode D b Is connected to the anode of a diode D b Is connected to node b.
The capacitor C in the differential current compensation three-port circuit h Can be deleted and simultaneously the diode D can be utilized a And a switch tube S a Replacing the switch tube S h By means of a diode D b And a switch tube S b Instead of diode D h (ii) a Diode D a Cathode and switching tube S b One end of which is connected to the original capacitor C h In the positive position of diode D a Anode and switch tube S a Is connected with one end of a switch tube S a Is connected to the node a and the switching tube S b Another terminal of (1) and a diode D b Is connected to the anode of a diode D b Is connected to node b.
Further, if the voltage of the ith (i =1,2, \8230;, n) dc microgrid is greater than that of the other dc microgrid and the capacitor C l 、C h Voltage of (2), then the diode D can be deleted i1 And a switching tube S i2 (ii) a If the voltage of the j (j =1,2, \8230;, n) th direct current microgrid is lower than that of other direct current microgrids and the capacitor C l 、C h The voltage of (2) can be removed i1 And a diode D i2 (ii) a If the capacitance C l The voltage of the grid is larger than a certain direct current micro-grid or capacitor C h Voltage of (2), diode D l An additional switch tube and a switch tube S are required to be connected in series l An additional diode is required to be connected in series; if the capacitance C h Is less than a certain direct current micro-grid or capacitor C l Voltage of (2), diode D h An additional switch tube and a switch tube S are connected in series h An additional diode is connected in series.
Further, a capacitor C h 、C l May be replaced by a different form of source, load or stored energy.
Further, the direct current micro grids 1 to n can be replaced by different types of sources, loads or energy storage.
Further, if the kth (k =1,2, \8230;, n) dc microgrid outputs only energy or absorbs only energy, the diode D may be correspondingly deleted k2 Switch tube S k2 Or diode D k1 And a switch tube S k1 。
Compared with the prior art, the invention has the advantages that:
(1) The free power exchange of the direct-current microgrid group can be realized by using fewer elements;
(2) Diode D 11 ～D n1 、D 12 ～D n2 And a switching tube S 11 ～S n1 、S 12 ～S n2 The voltage stress of (2) is low;
(3) The proposed implementation scheme of the three-port circuit with different differential current compensation has advantages in the aspects of element number, current stress and the like, and is suitable for different application scenes.
Drawings
Fig. 1 is an example of a dc microgrid group flexible interconnection system based on differential current compensation according to the present invention;
FIG. 2 is a schematic diagram of FIG. 1 with capacitor C removed l And a conducting wire is used to replace the switch tube S l Delete diode D l Examples of (a);
FIG. 3 is the capacitor C of FIG. 1 removed l And using a wire instead of the diode D l The switch tube S is deleted l Examples of (c);
FIG. 4 shows the capacitor C of FIG. 1 removed h And a conducting wire is used to replace the switch tube S h The diode D is deleted h Examples of (a);
FIG. 5 shows the capacitor C of FIG. 1 removed h And using a wire instead of the diode D h The switch tube S is deleted h Examples of (c);
FIG. 6 shows the capacitor C of FIG. 1 removed l And by means of a diode D a And a switch tube S a Instead of diode D l By means of a diode D b And a switch tube S b Replacing the switch tube S l Examples of (a);
FIG. 7 shows the capacitor C of FIG. 1 removed h And using a diode D a Switch tube S a Replacing the switch tube S h By means of a diode D b Switch tube S b Instead of diode D h Examples of (2).
Detailed Description
In order to more clearly explain the differential current compensation-based direct-current microgrid group flexible interconnection system and the characteristics thereof, the contents of the invention are described in detail below with reference to the accompanying drawings and specific embodiments; it should be noted that the exemplary bidirectional buck/boost converters are used in the bidirectional DC/DC converter of the differential current compensation three-port circuit in the embodiment described herein, which are only used for explaining the present invention and are not meant to limit the present invention.
Example 1
As shown in fig. 1, an embodiment of a dc microgrid group flexible interconnection system based on differential current compensation includes n (n)>1) A DC microgrid of 2n diodes D 11 ～D n1 、D 12 ～D n2 2n switching tubes S 11 ～S n1 、S 12 ～S n2 1 inductor L 1 And a differential current compensation three-port circuit. The negative ends of the n direct current micro-grids are connected to a node GND together, and the positive ends of the n direct current micro-grids are connected with a diode D respectively 11 ～D n1 Anode and switching tube S 12 ～S n2 One end of the two is connected; diode D 11 ～D n1 Respectively with a switching tube S 11 ～S n1 Is connected to switch tube S 11 ～S n1 Another end of (1) and an inductor L 1 Is connected to node a, inductor L 1 Another terminal of (D) and diode D 12 ～D n2 Is connected to the node b, and a diode D 12 ～D n2 Respectively with a switching tube S 12 ～S n2 And the other end of the two are connected. Differential current compensation three-port circuit is by electric capacity C h 、C l Switching tube S h 、S l Diode D h 、D l And an inductance L 2 Switch tube S 1 、S 2 And (4) forming. Capacitor C h Respectively pass throughClosing pipe S h And a diode D h A capacitor C connected to the node a and the node b l Respectively pass through diode D l And a switching tube S l Connected to the node a and the node b, and a capacitor C h And a capacitor C l The cathodes of the two are connected to a node GND; capacitor C l The positive electrode of the inductor also has an inductance L 2 Is connected to one end of an inductor L 2 The other end of the switch tube S 1 、S 2 Is connected to switch tube S 1 Is connected to the capacitor C at the other end h Positive electrode of (2), switching tube S 2 And the other end thereof is connected to the node GND.
Example 2
Similar to example 1, except that the differential current compensates the capacitance C in the three-port circuit l Deleting and replacing the switch tube S with a lead l The diode D is deleted l . As shown in fig. 2, the dc microgrid group flexible interconnection system based on differential current compensation according to this embodiment includes n (n)>1) A DC microgrid of 2n diodes D 11 ～D n1 、D 12 ～D n2 2n switching tubes S 11 ～S n1 、S 12 ～S n2 1 inductor L 1 And a differential current compensation three-port circuit. The negative ends of the n direct current micro-grids are connected to a node GND together, and the positive ends of the n direct current micro-grids are connected with a diode D respectively 11 ～D n1 Anode and switching tube S 12 ～S n2 One end of the two ends are connected; diode D 11 ～D n1 Respectively with a switching tube S 11 ～S n1 Is connected with one end of a switch tube S 11 ～S n1 Another end of (1) and an inductor L 1 Is connected to node a, inductor L 1 Another terminal of (1) and a diode D 12 ～D n2 Is connected to the node b, and a diode D 12 ～D n2 Respectively with a switching tube S 12 ～S n2 And the other end of the two are connected. Differential current compensation three-port circuit routing capacitor C h And a switch tube S h Diode D h And an inductance L 2 And a switch tube S 1 、S 2 And (4) forming. Capacitor C h Respectively pass through a switch tube S h And twoPolar tube D h A capacitor C connected to the node a and the node b h The negative electrode of the first switch is connected to a node GND; inductor L 2 Is connected to node b, inductor L 2 The other end of the switch tube S 1 、S 2 Is connected with one end of a switch tube S 1 Is connected to the capacitor C at the other end h Positive electrode of (2), switching tube S 2 And the other end thereof is connected to the node GND.
Example 3
Similar to example 1, except that the differential current compensates the capacitance C in the three-port circuit l Deleted, using a wire instead of diode D l The switch tube S is deleted l . As shown in fig. 3, the dc microgrid group flexible interconnection system based on differential current compensation according to this embodiment includes n (n)>1) A DC microgrid of 2n diodes D 11 ～D n1 、D 12 ～D n2 2n switching tubes S 11 ～S n1 、S 12 ～S n2 1 inductor L 1 And a differential current compensation three-port circuit. The negative ends of the n direct current micro-grids are connected to a node GND together, and the positive ends of the n direct current micro-grids are connected with a diode D respectively 11 ～D n1 Anode of (2), switching tube S 12 ～S n2 One end of the two ends are connected; diode D 11 ～D n1 Respectively with a switching tube S 11 ～S n1 Is connected with one end of a switch tube S 11 ～S n1 Another end of (1) and an inductor L 1 Is connected to node a, inductor L 1 Another terminal of (1) and a diode D 12 ～D n2 Is connected to node b, diode D 12 ～D n2 Respectively with a switching tube S 12 ～S n2 And the other end of the two are connected. Differential current compensation three-port circuit is by electric capacity C h And a switch tube S h Diode D h And an inductance L 2 Switch tube S 1 、S 2 And (4) forming. Capacitor C h Respectively pass through a switch tube S h And a diode D h A capacitor C connected to the node a and the node b h The negative electrode of the first switch is connected to a node GND; inductor L 2 Is connected to node a, inductor L 2 The other end of the switch tube S 1 、S 2 Is connected with one end of a switch tube S 1 Is connected to the capacitor C at the other end h Positive electrode of (2), switching tube S 2 And the other end thereof is connected to the node GND.
Example 4
Similar to example 1, except that the differential current compensates the capacitance C in the three-port circuit h Deleting, and replacing switch tube S with wire h The diode D is deleted h . As shown in fig. 4, the dc microgrid group flexible interconnection system based on differential current compensation according to this embodiment includes n (n)>1) A DC microgrid of 2n diodes D 11 ～D n1 、D 12 ～D n2 2n switching tubes S 11 ～S n1 、S 12 ～S n2 1 inductance L 1 And a differential current compensation three-port circuit. The negative ends of the n direct-current micro-grids are connected to a node GND together, and the positive ends of the n direct-current micro-grids are connected with a diode D respectively 11 ～D n1 Anode of (2), switching tube S 12 ～S n2 One end of the two ends are connected; diode D 11 ～D n1 Respectively with a switching tube S 11 ～S n1 Is connected with one end of a switch tube S 11 ～S n1 Another end of (1) and an inductor L 1 Is connected to node a, inductor L 1 Another terminal of (D) and diode D 12 ～D n2 Is connected to node b, diode D 12 ～D n2 Respectively with a switching tube S 12 ～S n2 And the other end of the two are connected. Differential current compensation three-port circuit is by electric capacity C l Switch tube S l Diode D l And an inductance L 2 Switch tube S 1 、S 2 And (4) forming. Capacitor C l Respectively pass through diode D l And a switching tube S l Connected to the node a and the node b, a capacitor C l The negative electrode of the first switch is connected to a node GND; capacitor C l The positive electrode of the inductor also has an inductance L 2 Is connected to one end of an inductor L 2 The other end of the switch tube S 1 、S 2 Is connected with one end of a switch tube S 1 Is connected to the node a and the switching tube S 2 And the other end thereof is connected to the node GND.
Example 5
Similar to example 1, except that the differential current compensates the capacitance C in the three-port circuit h Deleted, using a wire instead of diode D h The switch tube S is deleted h . As shown in fig. 5, the dc microgrid group flexible interconnection system based on differential current compensation according to this embodiment includes n (n)>1) A DC microgrid of 2n diodes D 11 ～D n1 、D 12 ～D n2 2n switching tubes S 11 ～S n1 、S 12 ～S n2 1 inductor L 1 And a differential current compensation three-port circuit. The negative ends of the n direct-current micro-grids are connected to a node GND together, and the positive ends of the n direct-current micro-grids are connected with a diode D respectively 11 ～D n1 Anode of (2), switching tube S 12 ～S n2 One end of the two ends are connected; diode D 11 ～D n1 Respectively with a switching tube S 11 ～S n1 Is connected to switch tube S 11 ～S n1 Another end of (1) and an inductor L 1 Is connected to node a, inductor L 1 Another terminal of (1) and a diode D 12 ～D n2 Is connected to node b, diode D 12 ～D n2 Respectively with a switching tube S 12 ～S n2 And the other end of the two are connected. Differential current compensation three-port circuit is by electric capacity C l Switch tube S l Diode D l And an inductance L 2 Switch tube S 1 、S 2 And (4) forming. Capacitor C l Respectively pass through diode D l And a switching tube S l Connected to the node a and the node b, and a capacitor C l The negative electrode of the first switch is connected to a node GND; capacitor C l The positive electrode of the inductor also has an inductance L 2 Is connected to one end of an inductor L 2 The other end of the switch tube S 1 、S 2 Is connected with one end of a switch tube S 1 Is connected to node b, a switching tube S 2 And the other end thereof is connected to the node GND.
Example 6
Similar to example 1, except that the differential current compensates the capacitance C in the three-port circuit l Can be deleted and deleted at the same timeCan utilize a diode D a Switch tube S a Instead of diode D l By means of a diode D b Switch tube S b Replacing the switch tube S l . As shown in fig. 6, the dc microgrid group flexible interconnection system based on differential current compensation according to this embodiment includes n (n)>1) A DC microgrid of 2n diodes D 11 ～D n1 、D 12 ～D n2 2n switching tubes S 11 ～S n1 、S 12 ～S n2 1 inductor L 1 And a differential current compensation three-port circuit. The negative ends of the n direct current micro-grids are connected to a node GND together, and the positive ends of the n direct current micro-grids are connected with a diode D respectively 11 ～D n1 Anode and switching tube S 12 ～S n2 One end of the two ends are connected; diode D 11 ～D n1 Respectively with a switching tube S 11 ～S n1 Is connected with one end of a switch tube S 11 ～S n1 Another end of (1) and an inductor L 1 Is connected to node a, inductor L 1 Another terminal of (D) and diode D 12 ～D n2 Is connected to node b, diode D 12 ～D n2 Respectively with a switching tube S 12 ～S n2 And the other end of the two are connected. Differential current compensation three-port circuit is by electric capacity C h Switch tube S h Diode D h Diode D a Switch tube S a Diode D b Switch tube S b And an inductance L 2 Switch tube S 1 、S 2 And (4) forming. Capacitor C h Respectively pass through a switch tube S h And a diode D h A capacitor C connected to the node a and the node b h The negative electrode of the first switch is connected to a node GND; inductor L 2 One end of and a diode D a Cathode and switching tube S b Connected to a diode D a Anode and switch tube S a Is connected with one end of a switch tube S a Is connected to the node a, a switching tube S b Another terminal of (D) and diode D b Is connected to the anode of a diode D b Is connected to node b; inductor L 2 The other end of the switch tube S 1 、S 2 Is connected to switch tube S 1 Is connected to the capacitor C at the other end h Positive electrode of (2), switching tube S 2 And the other end thereof is connected to the node GND.
Example 7
Similar to example 1, except that the differential current compensates the capacitance C in the three-port circuit h Can be deleted and simultaneously the diode D can be utilized a Switch tube S a Replacing the switch tube S h By means of a diode D b Switch tube S b Instead of diode D h . As shown in fig. 7, the dc microgrid group flexible interconnection system based on differential current compensation according to this embodiment includes n (n)>1) A DC microgrid of 2n diodes D 11 ～D n1 、D 12 ～D n2 2n switching tubes S 11 ～S n1 、S 12 ～S n2 1 inductor L 1 And a differential current compensation three-port circuit. The negative ends of the n direct current micro-grids are connected to a node GND together, and the positive ends of the n direct current micro-grids are connected with a diode D respectively 11 ～D n1 Anode of (2), switching tube S 12 ～S n2 One end of the two is connected; diode D 11 ～D n1 Respectively with a switching tube S 11 ～S n1 Is connected to switch tube S 11 ～S n1 Another end of (1) and an inductor L 1 Is connected to node a, inductor L 1 Another terminal of (1) and a diode D 12 ～D n2 Is connected to node b, diode D 12 ～D n2 Respectively with a switching tube S 12 ～S n2 And the other end of the two are connected. Differential current compensation three-port circuit routing capacitor C l And a switch tube S l Diode D l Diode D a And a switch tube S a Diode D b Switch tube S b And an inductance L 2 Switch tube S 1 、S 2 And (4) forming. Capacitor C l Respectively pass through diode D l And a switching tube S l A capacitor C connected to the node a and the node b l Is connected to the node GND; capacitor C l The positive electrode of the inductor also has an inductance L 2 Is connected to one end of an inductor L 2 The other end of the switch tube S 1 、S 2 Is connected to switch tube S 2 Is connected to a node GND, a switching tube S 1 Another terminal of (D) and diode D a Cathode and switching tube S b Connected to a diode D a And a switch tube S a Is connected with one end of a switch tube S a Is connected to the node a and the switching tube S b Another terminal of (1) and a diode D b Is connected to the anode of a diode D b Is connected to node b.
Furthermore, if the voltage of the ith (i =1,2, \8230;, n) direct-current microgrid is greater than that of other direct-current microgrids and the capacitor C, the direct-current microgrid group flexible interconnection system based on differential current compensation of the invention l 、C h Voltage of (D), the diode D can be deleted i1 And a switching tube S i2 (ii) a If the voltage of the j (j =1,2, \8230;, n) th DC microgrid is smaller than that of other DC microgrids and the capacitor C l 、C h The voltage of (2) can be removed by removing the switch tube S i1 And a diode D i2 (ii) a If the capacitance C l The voltage of the grid is larger than a certain direct current micro-grid or capacitor C h Voltage of (2), diode D l An additional switch tube and a switch tube S are required to be connected in series l An additional diode needs to be connected in series; if the capacitance C h Is less than a certain direct current micro-grid or capacitor C l Voltage of (2), diode D h An additional switch tube and a switch tube S are connected in series h An additional diode is connected in series. If the kth (k =1,2, \8230;, n) dc microgrid outputs only energy or absorbs only energy, the diode D may be correspondingly deleted k2 Switch tube S k2 Or diode D k1 Switch tube S k1 。
Further, the direct-current microgrid group flexible interconnection system based on differential current compensation and the capacitor C h 、C l The direct current microgrid 1-n can be replaced by sources, loads or energy storage in different forms.
Claims (10)
1. The direct-current microgrid group flexible interconnection system based on differential current compensation is characterized by comprising n direct-current microgrids and 2n diodes D 11 ～D n1 、D 12 ～D n2 2n switching tubes S 11 ～S n1 、S 12 ～S n2 1 inductance L 1 And a differential current compensating three-port circuit, n>1; the negative ends of the n direct current micro-grids are connected to a node GND together, and the positive ends of the n direct current micro-grids are respectively connected with a diode D 11 ～D n1 Anode of (2), switching tube S 12 ～S n2 One end of the two ends are connected; diode D 11 ～D n1 Respectively with a switching tube S 11 ～S n1 Is connected to switch tube S 11 ～S n1 Another end of (1) and an inductor L 1 Is connected to node a, inductor L 1 Another terminal of (1) and a diode D 12 ～D n2 Is connected to the node b, and a diode D 12 ～D n2 Respectively with a switching tube S 12 ～S n2 The other ends of the two are connected; differential current compensation three-port circuit is by electric capacity C h 、C l Switching tube S h 、S l Diode D h 、D l And a bidirectional DC converter; capacitor C h Respectively pass through a switch tube S h And a diode D h A capacitor C connected to the node a and the node b l Respectively pass through diode D l And a switching tube S l Connected to the node a and the node b, and a capacitor C h And a capacitor C l The cathodes of the two are connected to a node GND; capacitor C h Capacitor C l Connected by different types of bidirectional DC converters.
2. The differential current compensation based flexible interconnection system for DC micro-grid groups according to claim 1, wherein the different types of bidirectional DC converters comprise a transformer consisting of an inductor L 2 And a switch tube S 1 And a switching tube S 2 Formed bidirectional buck/boost converter, in which the inductor L 2 One terminal of and a capacitor C l Is connected with the positive pole of the inductor L 2 The other end of the switch tube S 1 、S 2 Is connected to switch tube S 1 Is connected to the capacitor C at the other end h Anode of (2), switching tubeS 2 And the other end thereof is connected to the node GND.
3. The differential current compensation-based direct current microgrid cluster flexible interconnection system of claim 1, wherein if a capacitor C in a differential current compensation three-port circuit is deleted l Then use the conducting wire to replace the switch tube S l The diode D is deleted l Or using wires instead of diodes D l The switch tube S is deleted l 。
4. The differential current compensation-based direct current microgrid cluster flexible interconnection system of claim 1, wherein if a capacitor C in a differential current compensation three-port circuit is deleted h Then, a conducting wire is used to replace the switch tube S h The diode D is deleted h Or using a wire instead of diode D h The switch tube S is deleted h 。
5. The differential current compensation-based direct current microgrid cluster flexible interconnection system of claim 1, wherein if a capacitor C in a differential current compensation three-port circuit is deleted l Then use the diode D a And a switch tube S a Instead of diode D l By means of a diode D b And a switch tube S b Replacing the switch tube S l (ii) a Wherein, the diode D a Cathode and switching tube S b One end of which is connected to the original capacitor C l At the anode position of diode D a Anode and switch tube S a Is connected to switch tube S a Is connected to the node a and the switching tube S b Another terminal of (D) and diode D b Is connected to the anode of a diode D b Is connected to node b.
6. The differential current compensation based flexible interconnection system for DC micro-grid groups according to claim 1, wherein the capacitor C in the three-port circuit of the differential current compensation is deleted h Then use the diode D a Switch tube S a Replacing the switch tube S h By means of a diode D b And openerClosing pipe S b Instead of diode D h (ii) a Diode D a Cathode and switching tube S b One end of which is connected to the original capacitor C h In the positive position of diode D a And a switch tube S a Is connected with one end of a switch tube S a Is connected to the node a and the switching tube S b Another terminal of (D) and diode D b Is connected to the anode of a diode D b Is connected to node b.
7. The differential current compensation-based flexible interconnection system for DC microgrid groups of claim 1, wherein if the voltage of the ith DC microgrid is greater than that of the other DC microgrids and the capacitor C l 、C h I =1,2, \8230, n, the diode D is deleted i1 And a switching tube S i2 (ii) a If the voltage of the jth direct-current microgrid is less than that of other direct-current microgrids and the capacitor C l 、C h J =1,2, \8230, n, the switch tube S is deleted i1 And a diode D i2 If the capacitance C is l The voltage of the grid is larger than a certain direct current micro-grid or capacitor C h Voltage of (2), diode D l An additional switch tube and a switch tube S are connected in series l An additional diode needs to be connected in series; if the capacitance C h Is less than a certain DC micro-grid or capacitor C l Voltage of (2), diode D h An additional switch tube and a switch tube S are connected in series h An additional diode is connected in series.
8. The differential current compensation-based direct current microgrid group flexible interconnection system of claim 1, wherein a capacitor C h 、C l May be replaced by a different form of source, load or stored energy.
9. The differential current compensation-based flexible interconnection system for the DC microgrid cluster as recited in claim 1, wherein the DC microgrids 1-n can be replaced by different types of sources, loads or energy storage.
10. Differential current based compensation as claimed in claim 1The compensated direct current microgrid group flexible interconnection system is characterized in that if the kth direct current microgrid only outputs energy or only absorbs energy, the diode D is deleted k2 Switch tube S k2 Or diode D k1 Switch tube S k1 ，k＝1,2,…,n。
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102007035418A1 (en) * | 2007-07-28 | 2009-01-29 | Vastview Technology Inc. | Direct current converter for electronic device, has circuit with current source, and producing compensation voltage, which is superimposed to regulate voltage level of output direct current voltage |
| CN106602851A (en) * | 2017-01-11 | 2017-04-26 | 哈尔滨工业大学深圳研究生院 | Low frequency pulse current ripple inhibition circuit suitable for pulse load |
| CN108574411A (en) * | 2018-05-22 | 2018-09-25 | 安徽工业大学 | Two-way DC/DC power inverters dual-port stable control method and its control circuit |
| CN108631326A (en) * | 2018-04-26 | 2018-10-09 | 南京理工大学 | Idle and harmonic compensation device based on Buck type three-level AC AC-AC converters |
| WO2019024417A1 (en) * | 2017-08-02 | 2019-02-07 | 深圳市暗能量电源有限公司 | Led illumination driving circuit of multi-stage current outputs |
| JP2020201754A (en) * | 2019-06-11 | 2020-12-17 | エイブリック株式会社 | Reference voltage generation circuit |
| CN113203887A (en) * | 2021-04-19 | 2021-08-03 | 中国电力科学研究院有限公司武汉分院 | Device and method suitable for measuring direct-current voltage of direct-current power distribution network |
| CN216490231U (en) * | 2021-07-30 | 2022-05-10 | 福州大学 | Novel power adapter |
| CN114744607A (en) * | 2022-04-27 | 2022-07-12 | 厦门大学 | Flexible interconnection framework of serial-type direct current microgrid group |
-
2022
- 2022-09-29 CN CN202211198362.7A patent/CN115498619B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102007035418A1 (en) * | 2007-07-28 | 2009-01-29 | Vastview Technology Inc. | Direct current converter for electronic device, has circuit with current source, and producing compensation voltage, which is superimposed to regulate voltage level of output direct current voltage |
| CN106602851A (en) * | 2017-01-11 | 2017-04-26 | 哈尔滨工业大学深圳研究生院 | Low frequency pulse current ripple inhibition circuit suitable for pulse load |
| WO2019024417A1 (en) * | 2017-08-02 | 2019-02-07 | 深圳市暗能量电源有限公司 | Led illumination driving circuit of multi-stage current outputs |
| CN108631326A (en) * | 2018-04-26 | 2018-10-09 | 南京理工大学 | Idle and harmonic compensation device based on Buck type three-level AC AC-AC converters |
| CN108574411A (en) * | 2018-05-22 | 2018-09-25 | 安徽工业大学 | Two-way DC/DC power inverters dual-port stable control method and its control circuit |
| JP2020201754A (en) * | 2019-06-11 | 2020-12-17 | エイブリック株式会社 | Reference voltage generation circuit |
| CN113203887A (en) * | 2021-04-19 | 2021-08-03 | 中国电力科学研究院有限公司武汉分院 | Device and method suitable for measuring direct-current voltage of direct-current power distribution network |
| CN216490231U (en) * | 2021-07-30 | 2022-05-10 | 福州大学 | Novel power adapter |
| CN114744607A (en) * | 2022-04-27 | 2022-07-12 | 厦门大学 | Flexible interconnection framework of serial-type direct current microgrid group |
Non-Patent Citations (3)
| Title |
|---|
| 贾燕冰;田晋杰;任春光;王金浩;李玉博;: "基于变换器级联的直流微电网混合储能系统及控制", 太阳能学报, no. 05, 28 May 2020 (2020-05-28) * |
| 陈桂鹏;邓焰;董洁;崔文峰;何湘宁;: "基于移相全桥的串联升压式部分功率DC-DC变换器", 电工技术学报, no. 19, 5 October 2015 (2015-10-05) * |
| 陶勇;邓焰;陈桂鹏;何湘宁;: "下垂控制逆变器中并网功率控制策略", 电工技术学报, no. 22, 25 November 2016 (2016-11-25) * |
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