CN112531666A - Direct current limiter topological structure and direct current limiter thereof - Google Patents
Direct current limiter topological structure and direct current limiter thereof Download PDFInfo
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- CN112531666A CN112531666A CN202011346344.XA CN202011346344A CN112531666A CN 112531666 A CN112531666 A CN 112531666A CN 202011346344 A CN202011346344 A CN 202011346344A CN 112531666 A CN112531666 A CN 112531666A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
- H02H9/025—Current limitation using field effect transistors
Abstract
The invention provides a direct current limiter topological structure and a direct current limiter thereof, relates to the technical field of power electronic conversion of direct current distribution, and solves the problem that peak voltage is caused by sudden change of inductive current when the existing direct current limiter is applied.
Description
Technical Field
The invention relates to the technical field of power electronic transformation of direct current distribution, in particular to a direct current limiter topological structure and a direct current limiter thereof.
Background
In recent years, with the change of structures of power supplies and loads, the requirements of users on the quality of electric energy are higher and higher, great challenges are brought to alternating current power distribution systems which occupy the mainstream of the power distribution systems all the time, and with the continuous development of smart power grids and the increasing maturity of power electronic technologies, people begin to research a direct current power distribution mode, wherein the direct current power distribution has a series of advantages of large power supply capacity, small line loss, good quality of electric energy, benefit for the access of distributed power supplies and the like.
The fault research of the direct current distribution system is the basis of the development of the direct current distribution technology, however, the current fault current limiter mainly aims at the alternating current distribution system or is limited by the hysteresis of direct current voltage detection, and is not suitable for the direct current distribution system needing quick response. When the direct current distribution system breaks down, the output current of the direct current power supply is too large, the current amplitude rises too fast, the fault current cannot be controlled, and unpredictable loss is brought to the direct current distribution system. Chinese patent No. 30/3/2018, publication No. CN104184135A, discloses a topology structure of a dc current limiter for HVDC, which can limit the rising speed and amplitude of dc current during a fault, quickly respond to the needs of a dc power distribution system, and reduce power loss, but the problem of voltage spike of an IGBT due to sudden change of inductive current is not considered in the technical scheme of the present patent.
Disclosure of Invention
The invention provides a direct current limiter topological structure and a direct current limiter thereof, aiming at solving the problem of peak voltage caused by sudden change of inductive current when the existing direct current limiter is applied, so that the voltage peak is avoided while the rising speed of the short-circuit current amplitude of a direct current distribution system is limited, and the uninterrupted and reliable power supply of the direct current distribution system to a load is ensured.
In order to achieve the technical effects, the technical scheme of the invention is as follows:
a DC current limiter topology comprising a first IGBT string, a second IGBT string connected in parallel with the first IGBT string, an RC series branch and an inductive branch, the first IGBT string comprising: the first IGBT structure and with first IGBT structure link to the second IGBT structure of first connecting point a, the second IGBT cluster includes: the third IGBT structure and the fourth IGBT structure are connected with the third IGBT structure at a second connection point b, the RC series branch is connected with the inductance branch in parallel, one end of the RC series branch and one end of the inductance branch are connected with the first connection point a, and the other end of the RC series branch and the other end of the inductance branch are connected with the second connection point b to form a bridge structure.
Preferably, the dc current limiter topology further includes a first lightning protection branch, and the first lightning protection branch is connected in parallel with the bridge structure, so as to ensure the safety of the application of the dc current limiter topology.
Preferably, the dc current limiter topology further includes a first grounding branch, an outlet inductor, a second lightning protection branch, a third grounding branch and a fourth grounding branch, one end of the first IGBT structure and one end of the third IGBT structure are connected to a third connection point f, one end of the second IGBT structure and one end of the fourth IGBT structure are connected to a fourth connection point d, one end of the first grounding branch is connected to the third connection point f, the other end of the first grounding branch is connected to ground, one end of the outlet inductor is connected to the fourth connection point d, the other ends are respectively connected to one end of the second lightning protection branch, one end of the third grounding branch and one end of the fourth grounding branch, the other end of the second lightning protection branch, the other end of the third grounding branch and the other end of the fourth grounding branch are all grounded, and the above all play an auxiliary protection role.
Preferably, when the direct current power distribution system normally operates, the first IGBT structure, the second IGBT structure, the third IGBT structure, and the fourth IGBT structure are all turned on, and at this time, the direct current limiter topology does not work.
Preferably, the trigger pulses of the first IGBT structure, the second IGBT structure, the third IGBT structure, and the fourth IGBT structure are controlled to turn on the first IGBT structure and the fourth IGBT structure, turn off the second IGBT structure and the third IGBT structure, and the current passes through the first IGBT structure, simultaneously passes through the RC series branch and the inductance branch, and then passes through the fourth IGBT structure to circulate, thereby forming a first current circulation path.
Preferably, when the direct current power distribution system has a fault, the trigger pulses of the first IGBT structure, the second IGBT structure, the third IGBT structure and the fourth IGBT structure are controlled to turn on the second IGBT structure and the third IGBT structure, the first IGBT structure and the fourth IGBT structure are turned off, and after passing through the second IGBT structure, the current passes through the RC series branch and the inductance branch respectively and simultaneously, and then flows through the third IGBT structure to form a second current circulation path.
Preferably, the first IGBT structure and the third IGBT structure are triggered alternately and are set to be a negative dead zone, so that the situation of no follow current or voltage spike is avoided.
Preferably, the first current circulation path and the second current circulation path through which the current flows are alternately switched, and when the fault of the direct current power distribution system is ended, the alternate switching is ended, so that uninterrupted and reliable power supply to the load is ensured.
The invention also provides a direct current limiter, which comprises the direct current limiter topology structure.
Preferably, the dc current limiter is installed at a dc outlet of a transformer in the dc distribution network or at a dc outlet of all devices in the dc distribution network, and the dc outlets of the devices except the transformer ensure that the dc current limiter can be shielded when the dc distribution network is in normal operation and put into operation when a fault occurs.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that:
the invention provides a direct current limiter topological structure and a direct current limiter thereof, wherein the direct current limiter topological structure comprises a first IGBT string and a second IGBT string which are connected in parallel, the first IGBT string and the second IGBT string respectively comprise two connected IGBT structures, and an RC series branch is connected between connecting nodes of any two connected IGBT structures except for an inductance branch.
Drawings
Fig. 1 is a schematic structural diagram of a dc current limiter topology proposed in an embodiment of the present invention;
fig. 2 is a schematic diagram illustrating a current flow path of a dc current limiter topology according to an embodiment of the present invention when a dc power distribution system is in normal operation;
fig. 3 shows a pulse control diagram of the topology of the dc current limiter proposed in the embodiment of the present invention when the dc power distribution system fails;
fig. 4 is a schematic diagram illustrating a current flow path of the dc current limiter topology according to the embodiment of the present invention when the dc power distribution system fails;
fig. 5 is a schematic diagram illustrating another current flow path of the topology of the dc current limiter proposed in the embodiment of the present invention when the dc power distribution system fails;
fig. 6 is a waveform diagram of an output current when a dc power distribution system fails according to an embodiment of the present invention.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the patent;
for better illustration of the present embodiment, certain parts of the drawings may be omitted, enlarged or reduced, and do not represent actual dimensions;
it will be understood by those skilled in the art that certain well-known descriptions of the figures may be omitted.
The technical solution of the present invention is further described below with reference to the accompanying drawings and examples.
Example 1
The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent;
the schematic structure of the dc current limiter topology shown in fig. 1 includes: first IGBT cluster 1, with the parallelly connected second IGBT cluster 2 of first IGBT cluster 1, RC series branch 3 and inductance branch 4, first IGBT cluster 1 includes: first IGBT structure 11 and second IGBT structure 12 connected to first IGBT structure 11 at first connection point a, second IGBT string 2 includes: the third IGBT structure 21 and the fourth IGBT structure 22 connected to the third IGBT structure 21 at the second connection point b, the RC series branch 3 is connected in parallel to the inductance branch 4, one end of the RC series branch 3 and one end of the inductance branch 4 are connected to the first connection point a, and the other end of the RC series branch 3 and the other end of the inductance branch 4 are connected to the second connection point b, thereby forming a bridge structure.
In this embodiment, referring to fig. 1, the dc current limiter topology further includes a first lightning protection branch 5, where the first lightning protection branch 5 is connected in parallel with the bridge structure, so as to ensure the safety of the application of the dc current limiter topology; the direct current limiter topological structure further comprises a first grounding branch 6, an outlet inductor 7, a second lightning protection branch 8, a third grounding branch 9 and a fourth grounding branch 10, wherein the first grounding branch 6 is formed by serially connecting a resistor and a controlled source, the third grounding branch 9 is formed by serially connecting a switch tube and a resistor, the fourth grounding branch 10 only comprises a switch tube, the third grounding branch 9 and the fourth grounding branch can be used for manufacturing short-circuit faults of different types, one end of the first IGBT structure 11 and one end of the third IGBT structure 21 are connected to a third connection point f, one end of the second IGBT structure 12 and one end of the fourth IGBT structure 22 are connected to a fourth connection point d, one end of the first grounding branch 6 is connected to the third connection point f, and the other end of the first grounding branch 6 is connected to the ground; one end of the outlet inductor 7 is connected to the fourth connection point d, the other end of the outlet inductor is connected to one end of the second lightning protection branch 8, one end of the third grounding branch 9 and one end of the fourth grounding branch 10, and the other end of the second lightning protection branch 8, the other end of the third grounding branch 9 and the other end of the fourth grounding branch 10 are all grounded.
In this embodiment, when the dc power distribution system normally operates, the first IGBT structure 11, the second IGBT structure 12, the third IGBT structure 21, and the fourth IGBT structure 22 are all turned on, and at this time, the dc current limiter topology does not work, a specific current flowing schematic diagram is shown in fig. 2, an arrow in fig. 2 indicates a current flowing direction, and I indicates a current.
When a direct current distribution system fails, trigger pulses of the first IGBT structure 11, the second IGBT structure 12, the third IGBT structure 21, and the fourth IGBT structure 22 are controlled to turn on the first IGBT structure 11 and the fourth IGBT structure 22, and turn off the second IGBT structure and the third IGBT structure, fig. 3 shows a pulse control diagram of a direct current limiter topology structure proposed in the embodiment of the present invention when the direct current distribution system fails, in this embodiment, in combination with fig. 1, starting pulses of the first IGBT structure 11 and the fourth IGBT structure 22 which are turned on are identical and are g1, starting pulses of the second IGBT structure 12 and the third IGBT structure 21 which are identical and are g2, referring to the pulse control diagram of fig. 3, an abscissa is time, an ordinate is a pulse control amplitude, a dotted line shows a direct current distribution system fault detection time M, after a current passes through the first IGBT structure 11, the current passes through the RC series branch 3 and the inductance branch 4 simultaneously, then, the current flows through the fourth IGBT structure 22, and a first current flow path is formed as shown in fig. 4, where an arrow indicates a flow direction of the current I.
In addition, when the dc distribution system fails, the trigger pulses of the first IGBT structure 11, the second IGBT structure 12, the third IGBT structure 21, and the fourth IGBT structure 22 are controlled to turn on the second IGBT structure 12 and the third IGBT structure 21, turn off the first IGBT structure 11 and the fourth IGBT structure 22, and then the current passes through the second IGBT structure 12, simultaneously passes through the RC series branch 3 and the inductance branch 4, and then passes through the third IGBT structure 21, so that a second current flow path is formed as shown in fig. 5, where an arrow indicates the flow direction of the current I.
In the present embodiment, referring to fig. 3, the first IGBT structure 11 and the third IGBT structure 21 are triggered alternately, and should be set as a negative dead zone, so as to avoid the situation of no follow current or voltage spike; the first current circulation path and the second current circulation path through which the current flows are alternately switched, and when the fault of the direct current distribution system is ended, the alternate switching is ended, so that the uninterrupted reliable power supply of the direct current distribution system to the load is ensured.
The invention also provides a direct current limiter, which comprises the direct current limiter topology, the direct current limiter is arranged at a direct current outlet of a transformer in the direct current distribution network or in all devices of the direct current distribution network, the direct current outlets of the devices except the transformer ensure that the direct current limiter can be shielded when the direct current distribution network works normally, and is put into operation in case of fault, fig. 6 shows the waveform diagram of the output current using the dc current limiter in case of fault of the dc power distribution system proposed in the embodiment of the present invention, in fig. 6, the abscissa represents time, the ordinate represents current amplitude, normally 9.37A, and, in the event of a fault in the dc system, the current amplitude is 297.03A, the current variation section is curve segment A in FIG. 6, therefore, the direct current limiter provided by the invention can effectively realize the amplitude limiting of the output current of the direct current power supply and the uninterrupted power supply of the load during the direct current short circuit.
The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent;
it should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A direct current limiter topology structure is characterized by comprising a first IGBT string, a second IGBT string connected with the first IGBT string in parallel, an RC series branch and an inductance branch, wherein the first IGBT string comprises: the first IGBT structure and with first IGBT structure link to the second IGBT structure of first connecting point a, the second IGBT cluster includes: the third IGBT structure and the fourth IGBT structure are connected with the third IGBT structure at a second connection point b, the RC series branch is connected with the inductance branch in parallel, one end of the RC series branch and one end of the inductance branch are connected with the first connection point a, and the other end of the RC series branch and the other end of the inductance branch are connected with the second connection point b to form a bridge structure.
2. A dc current limiter topology according to claim 1, further comprising a first lightning leg connected in parallel with the bridge structure.
3. The direct current limiter topology structure of claim 2, further comprising a first grounding branch, an outlet inductor, a second lightning protection branch, a third grounding branch and a fourth grounding branch, wherein one end of the first IGBT structure is connected to one end of the third IGBT structure at a third connection point f, one end of the second IGBT structure is connected to one end of the fourth IGBT structure at a fourth connection point d, one end of the first grounding branch is connected to the third connection point f, the other end of the first grounding branch is connected to ground, one end of the outlet inductor is connected to the fourth connection point d, the other ends of the outlet inductor are respectively connected to one end of the second lightning protection branch, one end of the third grounding branch and one end of the fourth grounding branch, and the other ends of the second lightning protection branch, the third grounding branch and the fourth grounding branch are all grounded.
4. The dc current limiter topology of claim 3, wherein the first IGBT structure, the second IGBT structure, the third IGBT structure, and the fourth IGBT structure are all turned on when the dc power distribution system is operating normally.
5. The direct current limiter topology according to claim 3, wherein when the direct current distribution system fails, the trigger pulses of the first IGBT structure, the second IGBT structure, the third IGBT structure and the fourth IGBT structure are controlled to turn on the first IGBT structure and the fourth IGBT structure, the second IGBT structure and the third IGBT structure are turned off, and after passing through the first IGBT structure, the current passes through the RC series branch and the inductor branch respectively and simultaneously, and then passes through the fourth IGBT structure to form a first current circulation path.
6. The direct current limiter topology according to claim 5, wherein when the direct current distribution system fails, the trigger pulses of the first IGBT structure, the second IGBT structure, the third IGBT structure and the fourth IGBT structure are controlled to turn on the second IGBT structure and the third IGBT structure, the first IGBT structure and the fourth IGBT structure are turned off, and after passing through the second IGBT structure, the current passes through the RC series branch and the inductor branch, respectively, and then passes through the third IGBT structure to form a second current circulation path.
7. A DC current limiter topology according to claim 6, characterized in that the first IGBT structure and the third IGBT structure are alternately triggered and set as negative dead zone.
8. The dc current limiter topology of claim 7, wherein the first and second current flow paths through which current flows are alternately switched, and wherein the alternate switching is terminated when the dc power distribution system fault is terminated.
9. A dc current limiter comprising a dc current limiter topology according to any of claims 1 to 8.
10. The dc current limiter according to claim 9, wherein the dc current limiter is installed at a dc outlet of a transformer in a dc distribution network or at a dc outlet of all devices of the dc distribution network except the transformer.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102255298A (en) * | 2011-07-01 | 2011-11-23 | 中国科学院电工研究所 | Power electronic failure current limiter |
| CN104184135A (en) * | 2014-08-29 | 2014-12-03 | 华北电力大学 | HVDC DC limiter topology |
| CN106026012A (en) * | 2016-06-29 | 2016-10-12 | 中国西电电气股份有限公司 | Hybrid active high-voltage direct-current circuit breaker |
| CN107528459A (en) * | 2017-09-05 | 2017-12-29 | 南方电网科学研究院有限责任公司 | Direct current limiter topology and its driving method, direct current limiter |
| CN108649527A (en) * | 2018-04-24 | 2018-10-12 | 哈尔滨工程大学 | A kind of hybrid solid-state direct current current-limiting formula breaker |
-
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- 2020-11-26 CN CN202011346344.XA patent/CN112531666A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102255298A (en) * | 2011-07-01 | 2011-11-23 | 中国科学院电工研究所 | Power electronic failure current limiter |
| CN104184135A (en) * | 2014-08-29 | 2014-12-03 | 华北电力大学 | HVDC DC limiter topology |
| CN106026012A (en) * | 2016-06-29 | 2016-10-12 | 中国西电电气股份有限公司 | Hybrid active high-voltage direct-current circuit breaker |
| CN107528459A (en) * | 2017-09-05 | 2017-12-29 | 南方电网科学研究院有限责任公司 | Direct current limiter topology and its driving method, direct current limiter |
| CN108649527A (en) * | 2018-04-24 | 2018-10-12 | 哈尔滨工程大学 | A kind of hybrid solid-state direct current current-limiting formula breaker |
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