KR101843234B1 - Shut down apparatus and method of electrical power converter - Google Patents

Shut down apparatus and method of electrical power converter Download PDF

Info

Publication number
KR101843234B1
KR101843234B1 KR1020150180062A KR20150180062A KR101843234B1 KR 101843234 B1 KR101843234 B1 KR 101843234B1 KR 1020150180062 A KR1020150180062 A KR 1020150180062A KR 20150180062 A KR20150180062 A KR 20150180062A KR 101843234 B1 KR101843234 B1 KR 101843234B1
Authority
KR
South Korea
Prior art keywords
power converter
inductor
switching unit
state
energy
Prior art date
Application number
KR1020150180062A
Other languages
Korean (ko)
Other versions
KR20170071884A (en
Inventor
박태식
문채주
Original Assignee
목포대학교산학협력단
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 목포대학교산학협력단 filed Critical 목포대학교산학협력단
Priority to KR1020150180062A priority Critical patent/KR101843234B1/en
Publication of KR20170071884A publication Critical patent/KR20170071884A/en
Application granted granted Critical
Publication of KR101843234B1 publication Critical patent/KR101843234B1/en

Links

Images

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
    • H02H3/087—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current for dc applications
    • H02M2001/322—
    • 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
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]

Abstract

A combined inductor and an inductor coupled to receive the energy stored in the passive element on the power converter side through the secondary coil on the power converter side according to the On or Off state of the first switching unit and the first switching unit, And an energy consuming unit for consuming energy transferred from the secondary side coil of the inductor. The shutdown apparatus of the power converter according to an embodiment of the present invention is disclosed.

Figure R1020150180062

Description

[0001] SHUT DOWN APPARATUS AND METHOD OF ELECTRICAL POWER CONVERTER [0002]

The present invention relates to the field of direct current systems. More specifically, the present invention relates to a method for quickly shutting down a DC converter power converter.

With the rapid development of IT technology, digital buildings and digital buildings such as IDC (Internet Data Center) are becoming common, and accordingly demand of DC power source is increasing. Also, the government's policy to expand renewable energy is increasing the power of distributed power such as solar power. Under such overall circumstances, the need for development of DC power technology is required.

At present, electric grid is the main axis of AC and DC network is used in some parts. It is predicted that the next generation power grid will develop into a hybrid type of mixed AC and DC. The superimposed DC grid connects the country and the continent, adjusts the power load balance, and reinforces the existing AC grid. DC grid also improves grid reliability and capacity of existing AC networks.

In particular, High Voltage Direct Current (HVDC) is a technology for transferring energy using a high-voltage direct current, not a current AC. In the case of DC, power control is possible different from AC, and loss is small in case of long-distance transmission. In addition, it is attracting attention as a next-generation power transmission concept that can connect different power networks and can be used for inter-country grid connection, or to prevent the breakdown of power grid by dividing power grid. In recent years, besides the function of replacing and complementing the existing AC transmission network, there have been more and more projects using HVDC technology in connection with the establishment of a large-scale renewable power generation complex.

However, the system reliability and stability enhancement technology for DC power supply technology is still insufficient. In particular, when a fault occurs in a DC system, the DC system must be shut off promptly, but there is a difficulty in blocking the DC system as compared with the AC system.

According to the waveforms of the alternating current and the waveform of the direct current shown in Figs. 1 (a) and 1 (b), in the case of the alternating current, since the zero crossing is performed every about 8.3 ms, However, in the case of the direct current, a high transient voltage due to blocking may occur, and damage to the contact may occur, which makes it difficult to block the voltage. Therefore, there is a need for a method for stably interrupting the DC system.

A shutdown device and shutdown method of a power converter according to an embodiment of the present invention aims at quickly shutting down a power converter.

Also, a shutdown apparatus and shutdown method of a power converter according to an embodiment of the present invention aims at safely shutting down a DC system through a quick shutdown of a power converter.

In addition, the shutdown device and the shutdown method of the power converter according to an embodiment of the present invention are intended to prevent a fault current from flowing to the load.

As one embodiment of the present invention, the first switching unit; The energy stored in the passive element including the inductor on the power converter side acts as the inductor of the power converter when the first switching unit is in the off state and the energy stored in the passive element including the power converter side is inactivated when the first switching unit is in the on state, And the first switching unit, and the energy consuming unit consumes the transmitted energy. The shutdown device of the power converter may be provided.

The power converter is connected to a DC circuit breaker. When the DC circuit breaker is turned off, the power conversion operation of the power converter is interrupted, and the first switching unit can be switched from the off state to the on state.

When the DC blocking circuit blocks the system, the second switching unit on the power converter side may be switched from the on state to the off state to stop the power conversion operation.

The coupled inductor may operate as an inductor of the power converter in a normal operation state and may transfer the energy stored in the coupled inductor core to the secondary coil of the coupled inductor through electromagnetic induction.

The power converter may include a transformer, and the secondary side of the transformer includes an auxiliary coil together with the secondary coil. When the first switching unit is in the on state, the energy stored in the transformer core is transmitted to the energy consuming unit via the auxiliary coil. .

The energy dissipation unit may include at least one of a capacitor and a resistor.

The power converter may include a buck converter or an isolated converter.

Wherein the combined inductor is located at a rear end of a capacitor on the power converter side and the power converter further includes another inductor located at a front end of the capacitor, the combined inductor being connected to the capacitor, The energy stored in the core of the coupled inductor located at the rear end of the capacitor is transmitted to the energy consuming unit through the secondary coil of the coupled inductor, and the energy consuming unit consumes the energy.

As another embodiment of the present invention, there is provided a method of shutting down a power converter by a shutdown apparatus, comprising: converting a first switching unit from an off state to an on state in accordance with a system shutdown operation of a DC breaker; Receiving energy stored in a passive element including an inductor on a power converter side from a primary coil of a coupled inductor connected in series with the first switching unit to a secondary coil; And a step of consuming energy transferred from the secondary coil of the coupled inductor. When the first switching unit is in an off state, the inductor of the power converter operates as an inductor, and the first switching unit is in an On state And a coupling type inductor that receives energy stored in the passive element on the power converter side from the primary coil on the power converter side to the secondary coil when the power converter is on the power converter side. .

The shutdown device and shutdown method of the power converter according to an embodiment of the present invention can quickly shut down the power converter.

In addition, the shutdown device and the shutdown method of the power converter according to the embodiment of the present invention can safely shut off the DC system through the rapid shutdown of the power converter.

In addition, the shutdown device and the shutdown method of the power converter according to the embodiment of the present invention can prevent the failure current from flowing to the load.

Fig. 1 (a) and Fig. 1 (b) are views showing the waveforms of the alternating current and the waveforms of the direct current.
FIG. 2 is a diagram for explaining a general method of blocking a DC system.
3 is a diagram illustrating a DC system to which a shutdown apparatus according to an embodiment of the present invention is applied.
4 is another diagram showing a DC system to which a shutdown apparatus according to an embodiment of the present invention is applied.
FIG. 5 is a view illustrating a coupled inductor according to an embodiment of the present invention shown in FIGS. 3 and 4. FIG.
6 is a diagram illustrating a DC system to which a shutdown apparatus according to another embodiment of the present invention is applied.
7 is a flowchart illustrating a method of shutting down a power converter according to another embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

The terms used in this specification will be briefly described, and the present invention will be described in detail.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments. Also, in certain cases, there may be a term selected arbitrarily by the applicant, in which case the meaning thereof will be described in detail in the description of the corresponding invention. Therefore, the term used in the present invention should be defined based on the meaning of the term, not on the name of a simple term, but on the entire contents of the present invention.

When an element is referred to as "including" an element throughout the specification, it is to be understood that the element may include other elements as well, without departing from the spirit or scope of the present invention. Also, the terms "part," " module, "and the like described in the specification mean units for processing at least one function or operation, which may be implemented in hardware or software or a combination of hardware and software . In addition, when a part is referred to as being "connected" to another part throughout the specification, it includes not only "directly connected" but also "connected with other part in between".

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a diagram for explaining a general method of blocking a DC system.

In the DC system, the power applied from the outside is converted by the power converter 10 and supplied to the load 20. If a system fault such as a short circuit occurs on the side of the load 20 while power is being supplied to the load 20, the DC circuit breaker 30 cuts off the system so that the adverse effect due to the failure does not reach the load 20 or the like. Here, the DC circuit breaker 30 may include, but is not limited to, a mechanical circuit breaker, a solid-state circuit breaker, or a hybrid circuit breaker.

When the DC breaker 30 blocks the system, the power converter 10 also stops operation to prevent the power from being continuously supplied to the load 20 side. However, since the power converter 10 generally includes passive elements such as inductors and capacitors, even if the operation of the power converter 10 is interrupted, the energy stored in the passive elements (hereinafter referred to as residual energy) A phenomenon that a supply is performed for a predetermined period of time occurs. When the residual energy is supplied to the load 20 side, the response of the DC breaker 30 is lowered, so that the interruption of the DC system can be delayed. That is, it is important to quickly consume the residual energy stored in the power converter 10 to ensure the reliability of the DC system.

3 is a diagram illustrating a DC system to which a shutdown apparatus 300 according to an embodiment of the present invention is applied.

3, a shutdown apparatus 300 according to an embodiment of the present invention includes a first switching unit 310, a coupled inductor 400, and an energy dissipation unit 330 of the shutdown apparatus 300 The first switching unit 310 and the energy consuming unit 330 are connected to the power converter 10 through the secondary coil 320 of the coupled inductor 400. [

3 also shows a buck converter as a power converter 10 that may include a combined inductor 400, a capacitor 12 and a second switching unit 13, but is not limited thereto And other elements may be further included in the power converter 10. The power conversion operation of the buck converter is obvious to those skilled in the art, and detailed operation of the buck converter is not described in detail.

As described above, when the DC interrupter 30 interrupts the system, the second switching unit 13 of the power converter 10 converts the state from the ON state to the OFF state, and stops the power conversion operation. In the conventional DC system, the residual energy stored in the passive elements such as the inductor of the power converter 10 and the passive elements such as the capacitor 12 is supplied to the load 20. In the shutdown apparatus 300 according to the embodiment of the present invention, Is forced to consume residual energy.

The first switching unit 310 of the shutdown apparatus 300 maintains the OFF state in a state where the DC blocking unit 30 does not block the system, The side coil 11 operates as an inductor of the power converter 10 and the first switching unit 310 is turned on when the DC breaker 30 blocks the system. The first switching unit 310 of the shutdown apparatus 300 may include, but is not limited to, a diode switch, a MOSFET switch, a JFET switch, a BJT switch, and the like.

The combined inductor 400 on the power converter 10 side has a primary coil 11 and a secondary coil 320 in one core 500 and a secondary coil 320 are opened so that the coupled inductor 400 functions as a general inductor. When the first switching unit 310 of the shutdown apparatus 300 is turned on, the residual energy stored in the passive elements such as the coupling inductor 400 and the capacitor 12 is transmitted to the secondary coil of the coupled inductor 400 320 to the energy-consuming unit 330. The energy consuming unit 330 connected to the coupled inductor 400 consumes the energy received from the secondary coil 320 of the coupled inductor 400 to quickly shut down the power converter 10. The energy dissipation unit 330 may include at least one of a resistor and a capacitor.

According to the shutdown apparatus 300 according to the embodiment of the present invention, when the DC blocker 30 cuts off the system, the power converter 10 receives the residual energy from the power converter 10 and consumes the energy to shut down the power converter 10 quickly , The adverse effect on the side of the DC breaker 30 and the load 20 due to the residual energy can be reduced.

4 is another diagram showing a DC system to which the shutdown apparatus 300 according to an embodiment of the present invention is applied.

The shutdown apparatus 300 shown in FIG. 4 may be coupled to a power converter 10 of a double inductor configuration, as shown in FIG. 4, wherein the power converter 10 includes two inductors, The coupled inductor 400 is connected to the rear end of the capacitor 12. Through such a structure, the shutdown device 300 can simultaneously remove energy stored in the inductor 19 connected to the front end of the capacitor 12, energy stored in the capacitor 12, and energy stored in the coupled inductor 400 have. The coupled inductor 400 connected to the rear end of the capacitor 12 transfers the residual energy to the energy consuming unit 330 through the secondary coil 320 in the event of a failure.

6 is a diagram illustrating a DC system to which a shutdown apparatus 600 according to another embodiment of the present invention is applied.

Referring to FIG. 6, an isolated converter, for example, a flyback converter, is shown as a power converter 10. The power converter 10 includes a transformer including a primary winding 14 and a secondary winding 15, a capacitor 17, and a first switching unit 13 of the power converter 10. [ The power conversion operation of the insulation converter is obvious to those skilled in the art, and detailed operation of the isolation converter is not described in detail.

6, the shutdown apparatus 600 includes a first switching unit 310, an auxiliary winding 620 and an energy dissipation unit 330, of which the auxiliary winding 620 is connected to the secondary side of the transformer .

When the DC interrupter 30 interrupts the system, the first switching unit 13 of the power converter 10 converts the state from the on state to the off state, and stops the power conversion operation. In the conventional DC system, the residual energy stored in the transformer core of the power converter 10 is supplied to the load 20. The shutdown apparatus 600 according to an embodiment of the present invention receives residual energy, .

When the power converter 10 is normally operating in the normal state of the DC breaker 30, the first switching unit 310 of the shutdown apparatus 600 maintains the off state, and when the DC breaker 30 blocks the system The first switching unit 310 of the shutdown apparatus 600 is turned on. The switching unit 310 of the shutdown apparatus 600 may include, but is not limited to, a diode switch, a MOSFET switch, a JFET switch, a BJT switch, and the like.

When the first switching unit 310 of the shutdown apparatus 600 is in the ON state, the residual energy stored in the core of the transformer is transmitted to the energy consuming unit 330 through the auxiliary winding 620 on the secondary side of the transformer, The residual energy is consumed by the energy consuming part 330. The energy dissipation unit 330 may include at least one of a resistor and a capacitor.

7 is a flowchart illustrating a method of shutting down the power converter 10 according to another embodiment of the present invention.

Referring to FIG. 7, a method of shutting down the power converter 10 according to another embodiment of the present invention is comprised of steps that are processed in a time-series manner in the shutdown apparatus 300 shown in FIG. 3 and FIG. Therefore, it is understood that the contents described above with respect to the shutdown apparatus 300 shown in FIGS. 3 and 4 also apply to the shutdown method of FIG. 7, even if omitted from the following description.

In step S710, the shutdown apparatus 300 converts the first switching unit 310 of the shutdown apparatus 300 from the off state to the on state in accordance with the system shutdown operation of the DC breaker 30. The DC circuit breaker 30 can shut off the system when an accident such as disconnection occurs in the system. When the DC breaker 30 blocks the system, the DC converter power converter 10 also stops its operation.

The shutdown apparatus 300 receives the residual energy from the core of the coupled inductor on the power converter 10 side through the secondary coil 320 of the coupled inductor 400 in step S720. The residual energy is energy stored in a passive element such as an inductor, a capacitor, etc. of the power converter 10.

In step S730, the shutdown apparatus 300 consumes the residual energy transmitted from the secondary coil 320 of the coupled inductor through the energy consuming unit 330, thereby quickly shutting down the power converter 10. [

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

300, 600: Shutdown device
310: first switching unit
400: Coupled inductor
11: Primary coil of coupled inductor
320: secondary coil of coupled inductor
13:
14: Primary winding of transformer
15: Transformer secondary winding
620: Transformer secondary winding
330: Energy consumption unit

Claims (9)

A first switching unit;
And operates as an inductor of the power converter when the first switching unit is in an off state,
A coupling type inductor that receives energy stored in a passive element on the power converter side from the primary coil on the power converter side to the secondary coil when the first switching unit is on; And
And an energy dissipation unit for consuming energy transferred from the secondary coil of the coupled inductor.
The method according to claim 1,
The DC converter is connected to the power converter,
Wherein the power conversion operation of the power converter is interrupted when the DC circuit breaker is turned off, and the first switching unit is switched from the off state to the on state.
3. The method of claim 2,
And the second switching unit on the power converter side switches from the on state to the off state to interrupt the power conversion operation when the DC blocking unit interrupts the system.
The method according to claim 1,
The energy stored in the passive element on the power converter side,
And is transmitted to the secondary coil of the coupled-type inductor through an electromagnetic induction phenomenon.
The method according to claim 1,
The energy-
A capacitor, and a resistor. ≪ Desc / Clms Page number 20 >
The method according to claim 1,
The power converter includes:
A buck converter or an isolated converter. ≪ Desc / Clms Page number 14 >
The method according to claim 1,
Wherein the primary side coil of the coupled inductor comprises:
A capacitor disposed on the power converter side,
The power converter further includes another inductor located at a previous stage of the capacitor,
The coupled inductor includes a capacitor, an inductor located at a front end of the capacitor, and an inductor coupled to the inductor,
Wherein the energy consuming unit consumes energy transferred from the secondary coil of the coupled inductor.
A first switching unit;
The first switching unit maintains an off state in a normal state of the power converter,
An auxiliary winding which receives the energy stored in the passive element of the power converter side from the primary coil of the transformer of the power converter when the DC blocking circuit blocks the system, And
And an energy consuming unit for consuming energy transferred from the auxiliary winding.
CLAIMS 1. A method for shutting down a power converter by a shutdown device,
Converting the first switching unit from the off state to the on state in accordance with the system interrupting operation of the DC breaker;
Receiving energy stored in a passive element on a power converter side from a coupled inductor on the power converter side to a secondary side coil of the coupled inductor connected in series with the first switching unit; And
Consuming energy transferred from the secondary side coil of the coupled inductor,
And operates as an inductor of the power converter when the first switching unit is off,
And a combinational inductor that receives energy stored in a passive element on the power converter side from a primary coil on the power converter side to a secondary coil when the first switching unit is in an On state, Shutdown method used.

KR1020150180062A 2015-12-16 2015-12-16 Shut down apparatus and method of electrical power converter KR101843234B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020150180062A KR101843234B1 (en) 2015-12-16 2015-12-16 Shut down apparatus and method of electrical power converter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020150180062A KR101843234B1 (en) 2015-12-16 2015-12-16 Shut down apparatus and method of electrical power converter

Publications (2)

Publication Number Publication Date
KR20170071884A KR20170071884A (en) 2017-06-26
KR101843234B1 true KR101843234B1 (en) 2018-03-28

Family

ID=59282374

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020150180062A KR101843234B1 (en) 2015-12-16 2015-12-16 Shut down apparatus and method of electrical power converter

Country Status (1)

Country Link
KR (1) KR101843234B1 (en)

Also Published As

Publication number Publication date
KR20170071884A (en) 2017-06-26

Similar Documents

Publication Publication Date Title
EP3490091A1 (en) Novel combined dc circuit breaker and application method therefor
CN103633623B (en) High voltage DC transformers and control method thereof
Döring et al. System integration aspects of DC circuit breakers
RU2592640C2 (en) Linear dc voltage protective automatic device
EP3252940B1 (en) Modular multilevel converter and power electronic transformer
JP2017526331A (en) DC-DC converter having a transformer
EP4033629A1 (en) Power supply apparatus, power supply system and data center
CN103891082A (en) Interface arrangement between ac and dc systems for reliable opening of the circuit breaker in time
US20160156175A1 (en) Current-limiting reactor apparatus
KR101873113B1 (en) Startup method of semiconductor transformer using subsidiary power and dc/dc converter
CN105391289A (en) Systems and methods for enhanced operation and protection of power converters
CN105308703A (en) Switching device for an on-load tap changer
Harrye et al. DC fault isolation study of bidirectional dual active bridge DC/DC converter for DC transmission grid application
CN103746553B (en) High pressure DC-DC converter and control method
Zhang et al. HV isolated power supply system for complex multiple electrical potential equipment in 500 kV hybrid DC breaker
Oishi et al. A hybrid DC circuit breaker combining a multilevel converter and mechanical contactors: verification of the principles of operation by experiment and simulation
Siu et al. Design and analysis of a bidirectional hybrid DC circuit breaker using AC relays with long life time
Tan et al. Experimental discussions on operating frequencies of a bidirectional isolated DC-DC converter for a battery energy storage system
US9667162B2 (en) Transformer connection apparatus
CN107846211B (en) Hybrid switch with main path connected in series with solid-state switch
Peng et al. Fast protection strategy for monopole grounding fault of low-voltage DC microgrid
WO2023185382A1 (en) Solid-state transformer and power supply device
KR101843234B1 (en) Shut down apparatus and method of electrical power converter
CN102570587A (en) Method for high-power distributed power supply
CN111049410B (en) Control method of electric energy conversion device and electric energy conversion system

Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal
E701 Decision to grant or registration of patent right
GRNT Written decision to grant