CN210780532U - Topological structure of power electronic transformer - Google Patents
Topological structure of power electronic transformer Download PDFInfo
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- CN210780532U CN210780532U CN201921453903.XU CN201921453903U CN210780532U CN 210780532 U CN210780532 U CN 210780532U CN 201921453903 U CN201921453903 U CN 201921453903U CN 210780532 U CN210780532 U CN 210780532U
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Abstract
The utility model provides a topological structure of power electronic transformer, power electronic transformer's topological structure comprises N level two-way DC converter topological structure, and every level two-way DC converter topological structure comprises the series connection side switch circuit, DC converter and the parallelly connected side switch circuit that connect gradually. The utility model provides a topological structure of power electronic transformer can realize the steady excision of trouble module when the trouble, and what do not shut down overhauls and changes trouble module, to the voltage impact of all the other normal modules when reducing trouble module excision, guarantees the stability of system.
Description
Technical Field
The utility model relates to a power electronics field, concretely relates to topological structure of power electronic transformer.
Background
The power electronic transformer can realize the functions of isolation, transformation, power transmission and the like. Power electronic transformers can be classified into two main categories, one is AC/AC conversion and the other is AC/DC/AC conversion, according to the presence or absence of intermediate high frequency isolation DC/DC. The AC/DC/AC conversion has more intermediate isolation links than the AC/AC conversion, and has more devices, but the power electronic transformer of the AC/DC/AC conversion has better control performance, can realize that low-voltage direct current and low-voltage alternating current are output in a certain variable range through proper control strategy and modulation algorithm, and ensures the power quality, so the power electronic transformer of the AC/DC/AC conversion becomes the mainstream of the current power electronic transformer.
In order to adapt to high-voltage direct-current power transmission, an intermediate isolation link needs multi-module series switching circuit input and multi-module parallel switching circuit output, and once a module fails or the module is periodically overhauled, stable work of the system can be influenced. The main mode adopted for redundancy switching at present is to shut down firstly and then bypass switching; the mode has long switching time, and causes large voltage impact on other modules which can normally work, thereby influencing the stability of output voltage.
SUMMERY OF THE UTILITY MODEL
The utility model provides a topological structure of power electronic transformer, its purpose is to the steady excision of trouble module when realizing the trouble, and what do not shut down overhauls and changes the trouble module, to the voltage impact of all the other normal modules when reducing the trouble module excision, guarantees the stability of system.
The utility model aims at adopting the following technical scheme to realize:
the topological structure of a kind of power electronic transformer, its improvement lies in, the topological structure of the said power electronic transformer is made up of topological structure of two-way DC/DC converter of N grades, each grade of two-way DC/DC converter topological structure is made up of switching circuit of series side, DC/DC converter and parallel side switching circuit connected sequentially;
a first connecting end in a series side switching circuit of a1 st-level bidirectional DC/DC converter topological structure is connected to a common connection point A, a second connecting end in a series side switching circuit of an Nth-level bidirectional DC/DC converter topological structure is connected to a common connection point B, and second connecting ends in series side switching circuits of 1 st-N-1 th-level bidirectional DC/DC converter topological structures are respectively connected with a first connecting end in a series side switching circuit of a next-level bidirectional DC/DC converter topological structure;
a third connecting end in the series side switching circuit of each stage of bidirectional DC/DC converter topological structure is connected to an input positive end of the DC/DC converter of each stage of bidirectional DC/DC converter topological structure, and a fourth connecting end in the series side switching circuit of each stage of bidirectional DC/DC converter topological structure is connected to an input negative end of the DC/DC converter of each stage of bidirectional DC/DC converter topological structure;
a first connecting end in a parallel side switching circuit of each level of bidirectional DC/DC converter topological structure is connected to an output positive end of a DC/DC converter of each level of bidirectional DC/DC converter topological structure, a second connecting end in a parallel side switching circuit of each level of bidirectional DC/DC converter topological structure is connected to an output negative end of a DC/DC converter of each level of bidirectional DC/DC converter topological structure, a third connecting end in a parallel side switching circuit of each level of bidirectional DC/DC converter topological structure is connected to a common connection point C, and a fourth connecting end in a parallel side switching circuit of each level of bidirectional DC/DC converter topological structure is connected to a common connection point D;
wherein N is a positive integer.
Preferably, the series-side switching circuit includes:
the first connection end of the series side switching circuit, the second connection end of the series side switching circuit, the third connection end of the series side switching circuit, the fourth connection end of the series side switching circuit, a switch K1, a switch K2, a switch K3, a switch K4, a switch K5, a buffer resistor R1, a buffer resistor R2, a piezoresistor R3, a capacitor C1 and a capacitor C2;
the first connecting end, the buffer resistor R1, the buffer resistor R2, the switch K4 and the third connecting end of the series side switching circuit are connected in sequence;
the second connecting end of the series side switching circuit, the switch K5 and the fourth connecting end of the series side switching circuit are connected in sequence;
the buffer resistor R1 is connected with the switch K1 in parallel, and the buffer resistor R2 is connected with the switch K2 in parallel;
the switch K3 is connected between a connection point between the buffer resistor R1 and the buffer resistor R2 and a connection point between the second connection end of the series-side switching circuit and the switch K5;
the piezoresistor R3 is connected between a connection point between the buffer resistor R2 and the switch K4 and a connection point between a second connection end of the series-side switching circuit and the switch K5;
the capacitor C1 is connected between a connection point between the buffer resistor R2 and the switch K4 and a connection point between a second connection end of the series-side switching circuit and the switch K5;
the capacitor C2 is connected between a connection point between the switch K4 and the third connection terminal of the series-side switching circuit and a connection point between the switch K5 and the fourth connection terminal of the series-side switching circuit.
Preferably, the parallel side switching circuit includes:
the first connection end of the parallel side switching circuit, the second connection end of the parallel side switching circuit, the third connection end of the parallel side switching circuit, the fourth connection end of the parallel side switching circuit, a switch K6, a switch K7, a switch K8, a buffer resistor R4, a capacitor C3 and a capacitor C4;
the first connection end of the parallel side switching circuit, the switch K6, the buffer resistor R4 and the third connection end of the parallel side switching circuit are connected in sequence;
the second connection end of the parallel side switching circuit, the switch K8 and the fourth connection end of the parallel side switching circuit are connected in sequence;
the buffer resistor R4 is connected with the switch K7 in parallel;
a connection point between the first connection end of the parallel side switching circuit and the switch K6 is connected with the positive stage of the capacitor C3, and a connection point between the second connection end of the parallel side switching circuit and the switch K8 is connected with the negative electrode of the capacitor C3;
a connection point between the switch K6 and the snubber resistor R4 is connected to the positive electrode of the capacitor C4, and a connection point between the switch K8 and the fourth connection end of the parallel side switching circuit is connected to the negative electrode of the capacitor C4.
Preferably, a power supply is connected between the common connection point A and the common connection point B, and a load is connected between the common connection point C and the common connection point D;
or a power supply is connected between the common connection point C and the common connection point D, and a load is connected between the common connection point A and the common connection point B.
The utility model has the advantages that:
the utility model provides a topological structure of power electronic transformer, power electronic transformer's topological structure comprises N level two-way DC converter topological structure, and every level two-way DC converter topological structure comprises the series connection side switch circuit, DC converter and the parallelly connected side switch circuit that connect gradually. The utility model provides a topological structure of power electronic transformer, to the quick steady excision of trouble module when can realizing the trouble, what do not shut down overhauls and changes the trouble module, and to the voltage impact of all the other normal modules when reducing the trouble module excision, it is enough to accomplish the trouble excision, through voltage-sharing control to surplus module redistribution voltage, assurance system's stability.
Drawings
Fig. 1 is a schematic view of a topology structure of a power electronic transformer provided by the present invention;
fig. 2 is a schematic structural diagram of a power supply connected between a common point a and a common point B in a topology structure of a power electronic transformer provided by an embodiment of the present invention.
Detailed Description
The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings.
The utility model provides a topological structure of power electronic transformer, as shown in figure 1, the topological structure of power electronic transformer comprises two-way DC/DC converter topological structure of N level, and two-way DC/DC converter topological structure of each level comprises the switching circuit of series side, DC/DC converter and the switching circuit of parallel side that connect gradually;
a first connecting end in a series side switching circuit of a1 st-level bidirectional DC/DC converter topological structure is connected to a common connection point A, a second connecting end in a series side switching circuit of an Nth-level bidirectional DC/DC converter topological structure is connected to a common connection point B, and second connecting ends in series side switching circuits of 1 st-N-1 th-level bidirectional DC/DC converter topological structures are respectively connected with a first connecting end in a series side switching circuit of a next-level bidirectional DC/DC converter topological structure;
a third connecting end in the series side switching circuit of each stage of bidirectional DC/DC converter topological structure is connected to an input positive end of the DC/DC converter of each stage of bidirectional DC/DC converter topological structure, and a fourth connecting end in the series side switching circuit of each stage of bidirectional DC/DC converter topological structure is connected to an input negative end of the DC/DC converter of each stage of bidirectional DC/DC converter topological structure;
a first connecting end in a parallel side switching circuit of each level of bidirectional DC/DC converter topological structure is connected to an output positive end of a DC/DC converter of each level of bidirectional DC/DC converter topological structure, a second connecting end in a parallel side switching circuit of each level of bidirectional DC/DC converter topological structure is connected to an output negative end of a DC/DC converter of each level of bidirectional DC/DC converter topological structure, a third connecting end in a parallel side switching circuit of each level of bidirectional DC/DC converter topological structure is connected to a common connection point C, and a fourth connecting end in a parallel side switching circuit of each level of bidirectional DC/DC converter topological structure is connected to a common connection point D;
wherein N is a positive integer.
The series side switching circuit includes:
the first connection end of the series side switching circuit, the second connection end of the series side switching circuit, the third connection end of the series side switching circuit, the fourth connection end of the series side switching circuit, a switch K1, a switch K2, a switch K3, a switch K4, a switch K5, a buffer resistor R1, a buffer resistor R2, a piezoresistor R3, a capacitor C1 and a capacitor C2;
the first connecting end, the buffer resistor R1, the buffer resistor R2, the switch K4 and the third connecting end of the series side switching circuit are connected in sequence;
the second connecting end of the series side switching circuit, the switch K5 and the fourth connecting end of the series side switching circuit are connected in sequence;
the buffer resistor R1 is connected with the switch K1 in parallel, and the buffer resistor R2 is connected with the switch K2 in parallel;
the switch K3 is connected between a connection point between the buffer resistor R1 and the buffer resistor R2 and a connection point between the second connection end of the series-side switching circuit and the switch K5;
the piezoresistor R3 is connected between a connection point between the buffer resistor R2 and the switch K4 and a connection point between a second connection end of the series-side switching circuit and the switch K5;
the capacitor C1 is connected between a connection point between the buffer resistor R2 and the switch K4 and a connection point between a second connection end of the series-side switching circuit and the switch K5;
the capacitor C2 is connected between a connection point between the switch K4 and the third connection terminal of the series-side switching circuit and a connection point between the switch K5 and the fourth connection terminal of the series-side switching circuit.
The parallel side switching circuit includes:
the first connection end of the parallel side switching circuit, the second connection end of the parallel side switching circuit, the third connection end of the parallel side switching circuit, the fourth connection end of the parallel side switching circuit, a switch K6, a switch K7, a switch K8, a buffer resistor R4, a capacitor C3 and a capacitor C4;
the first connection end of the parallel side switching circuit, the switch K6, the buffer resistor R4 and the third connection end of the parallel side switching circuit are connected in sequence;
the second connection end of the parallel side switching circuit, the switch K8 and the fourth connection end of the parallel side switching circuit are connected in sequence;
the buffer resistor R4 is connected with the switch K7 in parallel;
a connection point between the first connection end of the parallel side switching circuit and the switch K6 is connected with the positive stage of the capacitor C3, and a connection point between the second connection end of the parallel side switching circuit and the switch K8 is connected with the negative electrode of the capacitor C3;
a connection point between the switch K6 and the snubber resistor R4 is connected to the positive electrode of the capacitor C4, and a connection point between the switch K8 and the fourth connection end of the parallel side switching circuit is connected to the negative electrode of the capacitor C4.
In the topological structure of the power electronic transformer, as shown in fig. 2, a power supply is connected between a common connection point a and a common connection point B, and a load is connected between a common connection point C and a common connection point D;
or a power supply is connected between the common connection point C and the common connection point D, and a load is connected between the common connection point A and the common connection point B.
When a power supply is connected between the common connection point A and the common connection point B, and a load is connected between the common connection point C and the common connection point D, the control method comprises the following steps:
step A1: disconnecting a switch K1, a switch K2 and a switch K3 in each stage of bidirectional DC/DC converter topological structure, closing a switch K4, a switch K5, a switch K6, a switch K7 and a switch K8 in each stage of bidirectional DC/DC converter topological structure, and executing a step A2 when a preset voltage value is output between a public connection point A and a public connection point B;
step A2: and closing the switch K1 and the switch K2 in each stage of the bidirectional DC/DC converter topology.
After the step a2, if the topology of the i-th stage bidirectional DC/DC converter fails or needs to be repaired, the following steps are performed:
step a 1: disconnecting the switch K1 and the switch K2 in the ith-stage bidirectional DC/DC converter topology;
step a 2: closing a switch K3 in the topological structure of the ith-stage bidirectional DC/DC converter;
step a 3: disconnecting the switch K4, the switch K5, the switch K6 and the switch K8 in the i-th-stage bidirectional DC/DC converter topological structure, and executing the step a4 when voltage spikes generated by the switch K4, the switch K5, the switch K6 and the switch K8 are stabilized to a preset voltage value;
step a 4: closing a switch K1 in the topological structure of the ith-level bidirectional DC/DC converter, and opening a switch K7 in the topological structure of the ith-level bidirectional DC/DC converter;
step a 5: voltage-sharing control is carried out on the power input sides of the bidirectional DC/DC converter topological structures of other levels except the ith bidirectional DC/DC converter topological structure;
wherein i belongs to [1, N ], and N is the series of the topological structure of the bidirectional DC/DC converter in the topological structure of the power electronic transformer.
In the voltage-sharing control process, the voltage instruction value
Comprises the following steps:
wherein, VdcAnd the number of the topological structures of the bidirectional DC/DC converter in the topological structure of the power electronic transformer is N, and the number of the topological structures of the bidirectional DC/DC converter which has faults or needs to be overhauled is k.
When a power supply is connected between the common connection point C and the common connection point D, and a load is connected between the common connection point A and the common connection point B, the control method comprises the following steps:
step S1: closing a switch K1, a switch K2, a switch K4, a switch K5, a switch K6 and a switch K8 in the topological structure of the bidirectional DC/DC converter at each stage, opening a switch K3 and a switch K7, and executing a step S2 when a preset voltage value is output between a common connection point C and a common connection point D;
step S2: and closing the switch K7 in each stage of the bidirectional DC/DC converter topology.
After the step S2, if the topology of the i-th stage bidirectional DC/DC converter fails or needs to be repaired, the following steps are performed:
step s 1: switch K1 and switch K2 are open;
step s 2: closing switch K3;
step s 3: opening the switch K4, the switch K5, the switch K6 and the switch K8, and executing a step s4 when voltage spikes generated by the switch K4, the switch K5, the switch K6 and the switch K8 are stabilized to a preset voltage value;
step s 4: closing switch K1;
step s 5: voltage-sharing control is carried out on the power input sides of the bidirectional DC/DC converter topological structures of other levels except the ith bidirectional DC/DC converter topological structure;
wherein i belongs to [1, N ], and N is the series of the topological structure of the bidirectional DC/DC converter in the topological structure of the power electronic transformer.
In the voltage-sharing control process, the voltage instruction value
Comprises the following steps:
wherein, VdcAnd the number of the topological structures of the bidirectional DC/DC converter in the topological structure of the power electronic transformer is N, and the number of the topological structures of the bidirectional DC/DC converter which has faults or needs to be overhauled is k.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents of the embodiments of the invention may be made without departing from the spirit and scope of the invention, which should be construed as falling within the scope of the claims of the invention.
Claims (4)
1. A topological structure of a power electronic transformer is characterized in that the topological structure of the power electronic transformer consists of N-stage bidirectional DC/DC converter topological structures, and each stage of bidirectional DC/DC converter topological structure consists of a series side switching circuit, a DC/DC converter and a parallel side switching circuit which are connected in sequence;
a first connecting end in a series side switching circuit of a1 st-level bidirectional DC/DC converter topological structure is connected to a common connection point A, a second connecting end in a series side switching circuit of an Nth-level bidirectional DC/DC converter topological structure is connected to a common connection point B, and second connecting ends in series side switching circuits of 1 st-N-1 th-level bidirectional DC/DC converter topological structures are respectively connected with a first connecting end in a series side switching circuit of a next-level bidirectional DC/DC converter topological structure;
a third connecting end in the series side switching circuit of each stage of bidirectional DC/DC converter topological structure is connected to an input positive end of the DC/DC converter of each stage of bidirectional DC/DC converter topological structure, and a fourth connecting end in the series side switching circuit of each stage of bidirectional DC/DC converter topological structure is connected to an input negative end of the DC/DC converter of each stage of bidirectional DC/DC converter topological structure;
a first connecting end in a parallel side switching circuit of each level of bidirectional DC/DC converter topological structure is connected to an output positive end of a DC/DC converter of each level of bidirectional DC/DC converter topological structure, a second connecting end in a parallel side switching circuit of each level of bidirectional DC/DC converter topological structure is connected to an output negative end of a DC/DC converter of each level of bidirectional DC/DC converter topological structure, a third connecting end in a parallel side switching circuit of each level of bidirectional DC/DC converter topological structure is connected to a common connection point C, and a fourth connecting end in a parallel side switching circuit of each level of bidirectional DC/DC converter topological structure is connected to a common connection point D;
wherein N is a positive integer.
2. The topology of claim 1, wherein the series-side switching circuit comprises:
the first connection end of the series side switching circuit, the second connection end of the series side switching circuit, the third connection end of the series side switching circuit, the fourth connection end of the series side switching circuit, a switch K1, a switch K2, a switch K3, a switch K4, a switch K5, a buffer resistor R1, a buffer resistor R2, a piezoresistor R3, a capacitor C1 and a capacitor C2;
the first connecting end, the buffer resistor R1, the buffer resistor R2, the switch K4 and the third connecting end of the series side switching circuit are connected in sequence;
the second connecting end of the series side switching circuit, the switch K5 and the fourth connecting end of the series side switching circuit are connected in sequence;
the buffer resistor R1 is connected with the switch K1 in parallel, and the buffer resistor R2 is connected with the switch K2 in parallel;
the switch K3 is connected between a connection point between the buffer resistor R1 and the buffer resistor R2 and a connection point between the second connection end of the series-side switching circuit and the switch K5;
the piezoresistor R3 is connected between a connection point between the buffer resistor R2 and the switch K4 and a connection point between a second connection end of the series-side switching circuit and the switch K5;
the capacitor C1 is connected between a connection point between the buffer resistor R2 and the switch K4 and a connection point between a second connection end of the series-side switching circuit and the switch K5;
the capacitor C2 is connected between a connection point between the switch K4 and the third connection terminal of the series-side switching circuit and a connection point between the switch K5 and the fourth connection terminal of the series-side switching circuit.
3. The topology of claim 1, wherein the parallel-side switching circuit comprises:
the first connection end of the parallel side switching circuit, the second connection end of the parallel side switching circuit, the third connection end of the parallel side switching circuit, the fourth connection end of the parallel side switching circuit, a switch K6, a switch K7, a switch K8, a buffer resistor R4, a capacitor C3 and a capacitor C4;
the first connection end of the parallel side switching circuit, the switch K6, the buffer resistor R4 and the third connection end of the parallel side switching circuit are connected in sequence;
the second connection end of the parallel side switching circuit, the switch K8 and the fourth connection end of the parallel side switching circuit are connected in sequence;
the buffer resistor R4 is connected with the switch K7 in parallel;
a connection point between the first connection end of the parallel side switching circuit and the switch K6 is connected with the positive stage of the capacitor C3, and a connection point between the second connection end of the parallel side switching circuit and the switch K8 is connected with the negative electrode of the capacitor C3;
a connection point between the switch K6 and the snubber resistor R4 is connected to the positive electrode of the capacitor C4, and a connection point between the switch K8 and the fourth connection end of the parallel side switching circuit is connected to the negative electrode of the capacitor C4.
4. The topology of claim 1, wherein a power source is connected between point a and point B, and a load is connected between point C and point D;
or a power supply is connected between the common connection point C and the common connection point D, and a load is connected between the common connection point A and the common connection point B.
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| CN201921453903.XU CN210780532U (en) | 2019-09-03 | 2019-09-03 | Topological structure of power electronic transformer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110601521A (en) * | 2019-09-03 | 2019-12-20 | 中电普瑞科技有限公司 | Topological structure of power electronic transformer and control method thereof |
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2019
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110601521A (en) * | 2019-09-03 | 2019-12-20 | 中电普瑞科技有限公司 | Topological structure of power electronic transformer and control method thereof |
| CN110601521B (en) * | 2019-09-03 | 2024-07-19 | 中电普瑞科技有限公司 | Topological structure of power electronic transformer and control method thereof |
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