KR20180052026A - Bidirectional Solid State Transformer for Smart Grid - Google Patents
Bidirectional Solid State Transformer for Smart Grid Download PDFInfo
- Publication number
- KR20180052026A KR20180052026A KR1020160149066A KR20160149066A KR20180052026A KR 20180052026 A KR20180052026 A KR 20180052026A KR 1020160149066 A KR1020160149066 A KR 1020160149066A KR 20160149066 A KR20160149066 A KR 20160149066A KR 20180052026 A KR20180052026 A KR 20180052026A
- Authority
- KR
- South Korea
- Prior art keywords
- converter
- bidirectional
- smart grid
- ess
- semiconductor transformer
- Prior art date
Links
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
- H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
- H02M5/22—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M5/25—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means
- H02M5/257—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
Description
본 발명은 스마트 그리드용 양방향 반도체 변압기에 QZS Converter를 적용한다.The present invention applies a QZS converter to a bidirectional semiconductor transformer for a smart grid.
제안한 양방향 반도체 변압기는 배전계통의 변압기로써 동작함과 동시에 ESS와 DVR 기능을 수행할 수 있다. ESS(Energy Storage System)는 신재생 에너지와 심야전기 등을 일정시간 또는 공간에 보관하였다가 수요자의 사용 패턴에 따라 공급해 주기 위하여 생산된 에너지가 머무를 수 있는 저장장치 시스템이다. 그리고 DVR은 순시 전압 보상기로 전력품질을 저하시키는 여러 문제들 중에서 가장 빈도가 높으며, 민감한 부하를 가지고 있는 수용가에 많은 영향을 주고 있는 순간적인 전압상승(Voltage Swell)과 전압 강하(Voltage Sag)를 보상하여 전력의 품질을 개선시키는 장치이다.The proposed bidirectional semiconductor transformer can operate as a transformer of the distribution system and perform ESS and DVR functions. ESS (Energy Storage System) is a storage system in which energy produced to store renewable energy and late night electricity in a certain time or space and supply it according to the usage pattern of the consumer. DVR is an instantaneous voltage compensator which compensates for the instantaneous voltage swell and voltage sag which are the most frequent among many problems that degrade power quality and affect the customers with sensitive loads. Thereby improving the quality of electric power.
ESS는 에너지 저장장치에 에너지를 저장하기 위한 전력변환장치가 필요하며 DVR역시 보상전압을 만들기 위한 전력 변환 장치가 필요하다. 이와 같이 반도체 변압기와 ESS, DVR에 필요한 전력을 변환해주는 장치로 QZS Converter를 적용하여 통합적으로 운용이 가능하도록 시스템을 구현하는데 목적이 있다.The ESS requires a power conversion device to store energy in the energy storage device, and a DVR also needs a power conversion device to generate the compensation voltage. In this way, it is aimed to implement a system that can operate integrated by applying QZS Converter as a device to convert the power required for semiconductor transformer, ESS, DVR.
코일과 철심으로 구성된 변압기를 전력전자 제어에 의한 양방향 반도체 변압기로 대체 Transformer consisting of coil and iron core is replaced with bidirectional semiconductor transformer by power electronic control
일반적인 인버터 구조의 반도체 변압기가 아닌 QZS AC-AC Converter를 배전선로에 직렬로 연결 시켜 반도체 변압기로 사용하며, 간단한 제어방법을 이용하여 종래의 인버터 구조의 반도체 변압기와 동등한 성능을 구현할 수 있다. 아울러 배전계통에 직렬로 연결된 QZS AC-AC Converter를 통하여 DVR, ESS, UPS에 직접적인 전력변환도 가능하다. The QZS AC-AC converter, which is not a semiconductor inverter with a general inverter structure, is connected to the distribution line in series to be used as a semiconductor transformer. By using a simple control method, performance equivalent to that of a semiconductor inverter of a conventional inverter structure can be realized. Direct power conversion is also possible to DVR, ESS and UPS through QZS AC-AC Converter connected in series to distribution system.
종전의 코일과 철심으로 구성된 변압기의 물리적인 크기와 무게를 감소시키며, 설치가 용이하고 유지보수비용을 절감시킬 수 있다. 특히 절연유에 의한 환경 문제를 해결할 수 있다. 그리고 DVR, ESS, UPS 뿐만 아니라 스마트 그리드의 DC배전 분야 적용이 가능하리라 사료된다.It is possible to reduce the physical size and weight of a conventional transformer composed of a coil and an iron core, to facilitate installation and to reduce maintenance costs. In particular, environmental problems caused by insulating oil can be solved. In addition to DVR, ESS and UPS, it can be applied to DC distribution of smart grid.
[제1도] 1개의 고압 릴레이와 Quasi Z-소스 AC-AC 컨버터 1대를 배전선로에 직렬 연결하여 양방향 반도체 변압기 구성을 하며, Quasi Z-소스 AC-AC 컨버터의 정류단을 인버터로 구성을 한다.
또한 Quasi Z-소스 AC-AC 컨버터의 정류단에 양방향 Buck-Boost 컨버터를 제어하는 MCU로 구성이 되어 있다.[1] A bidirectional semiconductor transformer is constructed by connecting one high-voltage relay and one Quasi Z-source AC-AC converter to the distribution line in series, and the rectifier of the Quasi Z-source AC- do.
It also consists of an MCU that controls a bidirectional Buck-Boost converter at the rectifier end of the Quasi Z-source AC-to-AC converter.
본 발명의 스마트 그리드용 양방향 반도체 변압기(SST)는 [제2도], [제4도], [제6도]와 같은 회로동작을 한다.The bidirectional semiconductor transformer (SST) for a Smart Grid of the present invention performs circuit operations as shown in [Figure 2], [Figure 4], and [Figure 6].
[제2도][제3도] 양방향 반도체 변압기 컨버터 모드와 ESS Battery 충전모드이다. 22.9kv의 배전선로에 Quasi Z-소스 AC-AC컨버터를 직렬로 연결하여 일반수요자에게 반도체 변압기를 통하여 220vac의 전기를 공급한다. 이와 동시에 Quasi Z-소스 AC-AC컨버터의 정류단에 연결된 양방향 Buck-Boost Converter를 통하여 ESS Battery 충전 모드도 동작을 한다. Quasi Z-소스 AC-AC컨버터는 동상의 Buck 모드로 동작을 하고, 양방향 Buck-Boost는 48Vdc의 Battery를 충전하기 위하여 PI제어 통한 Buck 모드로 동작을 한다.[FIG. 2] [FIG. 3] is a bidirectional semiconductor transformer converter mode and an ESS battery charging mode. A Quasi Z-source AC-to-AC converter is connected in series to a 22.9 kV distribution line to provide 220 VAC of electricity to the general consumer through a semiconductor transformer. At the same time, the bidirectional Buck-Boost Converter connected to the rectifier of the Quasi Z-source AC-AC converter also operates the ESS battery charging mode. The Quasi Z-source AC-AC converter operates in the in-phase Buck mode, and the bidirectional Buck-Boost operates in the Buck mode through the PI control to charge the 48Vdc battery.
[제4도][제5도] 양방향 반도체 변압기의 DVR (Dynamic Voltage Restorer) 동작모드를 나타낸다. 피크치 검출법에 의해 실시간으로 읽어 들인 배전선로의 전압변동 및 순간 전압 Sag/Swell 상황을 슈미트 트리거에 의해 발생시킨 기준 전압과 비교하며 항상 감지하고 있다. 만약 전압변동 및 순간 전압 Sag/Swell 발생하면 양방향 반도체 변압기는 DVR로 동작을 하며, 양방향 Buck-Boost Converter의 스위치는 OFF가 되어 ESS는 동작을 하지 않는다.[Fourth Diagram] FIG. 5 shows a dynamic voltage restorer (DVR) operation mode of a bidirectional semiconductor transformer. The voltage fluctuation and the instantaneous voltage sag / swell condition on the distribution line read in real time by the peak value detection method are compared with the reference voltage generated by the Schmitt trigger and are always detected. If voltage fluctuation and instantaneous voltage sag / swell occurs, the bidirectional semiconductor transformer operates as a DVR, and the switch of bidirectional Buck-Boost Converter is turned off and the ESS does not operate.
[제6도][제7도] 양방향 반도체 변압기의 인버터 모드와 ESS Battery 방전모드를 나타낸다. 전기요금이 비싼 전기 Peak 시간대나 일시적으로 전기가 끊겼을 때 ESS 시스템에 충전되어 있는 전기를 이용하여 일반 수요자에게 값싸고 안정적인 전기를 공급한다. 22.9kv의 배전선로는 고압 릴레이에 의해 차단이 되고 ESS 시스템의 양방향 Buck-Boost Cnverter는 Boost 모드로 작동한다. 그리고 Quasi Z-소스 AC-AC 컨버터는 양방향 Buck-Boost Converter 의 승압된 출력전압을 이용하여 인버터 모드로 동작을 한다.[FIG. 6] FIG. 7 shows an inverter mode and an ESS Battery discharge mode of a bidirectional semiconductor transformer. It supplies cheap and stable electricity to the general consumer by using the electric peak electricity time which is expensive and the electricity charged in the ESS system when the electricity is temporarily cut off. The 22.9 kV distribution line is disconnected by the high voltage relay and the bi-directional Buck-Boost converter of the ESS system operates in Boost mode. And the Quasi Z-source AC-AC converter operates in inverter mode using the boosted output voltage of the bidirectional Buck-Boost Converter.
Claims (1)
단상 Quasi Z-Source AC-AC 컨버터의 구현 기술;
배전 선로의 양방향 반도체 변압기 설계 기술;
스마트 그리드용 양방향 반도체 변압기 설계 기술;
ESS에 적용된 양방향 반도체 변압기 설계 기술.In bidirectional semiconductor transformers for smart grids,
Implementation technology of single phase Quasi Z-Source AC-AC converter;
Bi - directional semiconductor transformer design technology for distribution lines;
Bidirectional semiconductor transformer design technology for smart grid;
Two - way semiconductor transformer design technology applied to ESS.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020160149066A KR20180052026A (en) | 2016-11-09 | 2016-11-09 | Bidirectional Solid State Transformer for Smart Grid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020160149066A KR20180052026A (en) | 2016-11-09 | 2016-11-09 | Bidirectional Solid State Transformer for Smart Grid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| KR20180052026A true KR20180052026A (en) | 2018-05-17 |
Family
ID=62486146
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1020160149066A KR20180052026A (en) | 2016-11-09 | 2016-11-09 | Bidirectional Solid State Transformer for Smart Grid |
Country Status (1)
| Country | Link |
|---|---|
| KR (1) | KR20180052026A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20220126897A (en) * | 2021-03-10 | 2022-09-19 | 목포대학교산학협력단 | Dvr phase angle control and bess charge/discharge control system in connection with photo voltaics |
| KR20230090833A (en) | 2021-12-15 | 2023-06-22 | 서울시립대학교 산학협력단 | Semiconductor transformer for wireless power transmission |
| KR20230154517A (en) | 2022-05-02 | 2023-11-09 | 서울시립대학교 산학협력단 | Multilevel wireless power transmission system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20120034011A (en) * | 2010-09-30 | 2012-04-09 | 인터실 아메리카스 엘엘씨 | System and method for converting an ac input voltage to a regulated dc output voltage using a z-type converter with rectified switches |
| KR101395556B1 (en) * | 2012-11-20 | 2014-05-16 | 전자부품연구원 | 3-phase z-source inverter |
| KR101463388B1 (en) * | 2013-10-28 | 2014-11-20 | 한국전기연구원 | Bidirectional semiconductor transformer using voltage doubler circuit structure |
-
2016
- 2016-11-09 KR KR1020160149066A patent/KR20180052026A/en not_active Application Discontinuation
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20120034011A (en) * | 2010-09-30 | 2012-04-09 | 인터실 아메리카스 엘엘씨 | System and method for converting an ac input voltage to a regulated dc output voltage using a z-type converter with rectified switches |
| KR101395556B1 (en) * | 2012-11-20 | 2014-05-16 | 전자부품연구원 | 3-phase z-source inverter |
| KR101463388B1 (en) * | 2013-10-28 | 2014-11-20 | 한국전기연구원 | Bidirectional semiconductor transformer using voltage doubler circuit structure |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20220126897A (en) * | 2021-03-10 | 2022-09-19 | 목포대학교산학협력단 | Dvr phase angle control and bess charge/discharge control system in connection with photo voltaics |
| KR20230090833A (en) | 2021-12-15 | 2023-06-22 | 서울시립대학교 산학협력단 | Semiconductor transformer for wireless power transmission |
| KR20230154517A (en) | 2022-05-02 | 2023-11-09 | 서울시립대학교 산학협력단 | Multilevel wireless power transmission system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Elsayed et al. | DC microgrids and distribution systems: An overview | |
| CN102355042A (en) | Super-capacitor-based direct current power device of power station and power supply method thereof | |
| KR20180052026A (en) | Bidirectional Solid State Transformer for Smart Grid | |
| CN103227515A (en) | Non-contact self-powered power supply for overhead high voltage line | |
| CN103219792B (en) | A kind of double supply automatic switch-over circuit device | |
| Rathod | Solid state transformer (SST) review of recent developments | |
| TW201338348A (en) | Uninterruptible power supply system | |
| CN203660492U (en) | Microcomputer comprehensive protection device having active/passive automatic switching function | |
| AU2015202261B2 (en) | Voltage adjusting apparatus | |
| KR20180094277A (en) | Dynamic Voltage Restorer for high voltage distribution line | |
| CN211183508U (en) | Power supply control device | |
| CN210490481U (en) | Dynamic voltage restorer based on short-time high-frequency secondary flywheel energy storage system | |
| TW201328118A (en) | Uninterruptible power supply system | |
| CN105811788A (en) | High potential energy supply system used for high voltage power electronic device | |
| CN110224432A (en) | A kind of box-type substation and its microgrid system control method | |
| CN202696482U (en) | Power supply circuit for leakage circuit breaker | |
| CN203205973U (en) | Double-power automatic switching circuit | |
| CN207766148U (en) | A kind of electric power management circuit of passive microcomputer protective relay device | |
| CN206850512U (en) | A kind of dual input auxiliary power supply of photovoltaic inverter electric power system | |
| CN201699422U (en) | Output circuit for three-phase power voltage stabilizer | |
| CN104953653A (en) | Portable self-powered direct-current power source output device for transformer substation | |
| KR20200113870A (en) | DC/DC Converter For LVDC Low Voltage DC GRID SYSTEM | |
| CN204442224U (en) | Transformer noload losses phase compensation device | |
| Srivastava et al. | Harmonic compensation of HVDC rectifier using shunt active filter | |
| CN203218956U (en) | Common bus storage battery charging/discharging system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A201 | Request for examination | ||
| E902 | Notification of reason for refusal | ||
| E601 | Decision to refuse application |