KR20210051862A - Reactive Power Compensation type Ground Transformer - Google Patents

Reactive Power Compensation type Ground Transformer Download PDF

Info

Publication number
KR20210051862A
KR20210051862A KR1020190137676A KR20190137676A KR20210051862A KR 20210051862 A KR20210051862 A KR 20210051862A KR 1020190137676 A KR1020190137676 A KR 1020190137676A KR 20190137676 A KR20190137676 A KR 20190137676A KR 20210051862 A KR20210051862 A KR 20210051862A
Authority
KR
South Korea
Prior art keywords
transformer
reactor
series
filtering
power
Prior art date
Application number
KR1020190137676A
Other languages
Korean (ko)
Other versions
KR102340636B1 (en
Inventor
장세창
장동진
전일권
Original Assignee
주식회사 파워맥스
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 주식회사 파워맥스 filed Critical 주식회사 파워맥스
Priority to KR1020190137676A priority Critical patent/KR102340636B1/en
Publication of KR20210051862A publication Critical patent/KR20210051862A/en
Application granted granted Critical
Publication of KR102340636B1 publication Critical patent/KR102340636B1/en

Links

Images

Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M5/00Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/02Conversion 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
    • H02M5/04Conversion 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
    • H02M5/10Conversion 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 transformers
    • H02M5/12Conversion 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 transformers for conversion of voltage or current amplitude only
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/18Arrangements for adjusting, eliminating or compensating reactive power in networks
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M1/00Details of apparatus for conversion
    • H02M1/0064Magnetic structures combining different functions, e.g. storage, filtering or transformation
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30Reactive power compensation

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The present invention relates to a reactive power compensation type ground transformer which implements accident prevention through monitoring of a load state. The reactive power compensation ground transformer comprises a current transformer (11), a power transformer (12), a filtering reactor (13), a circuit breaker (15), a smoothing reactor (19), a voltage generator (30), a controller (20), an MOSFET (40), a contactor (16), a precharging resistor (17), and a filtering capacitor (18).

Description

무효전력 보상형 지상변압기{Reactive Power Compensation type Ground Transformer}Reactive Power Compensation type Ground Transformer}

본 발명은 무효전력 보상형 지상변압기에 관한 것으로서, 더 상세하게는 상불평형 및 저역률을 보상할 수 있고 변압기 2차측의 전력상태를 확인할 수 있는 시스템을 지상변압기 내부 혹은 외부 부착형으로 개발하여 불필요한 전력소모를 없애고, 부하상태의 감시를 통한 사고 방지를 구현하도록 한 무효전력 보상형 지상변압기에 관한 것이다.The present invention relates to a reactive power compensation type ground transformer, and more specifically, a system capable of compensating for phase imbalance and low power factor and checking the power state of the secondary side of the transformer is developed as an internal or external attachment type of the transformer. It relates to a reactive power compensation type ground transformer that eliminates power consumption and implements accident prevention through monitoring of load conditions.

도 1을 참조하여 대한민국의 전력송신에 대하여 살펴보면, 국내에서는 산업,가정에 전력을 공급하기 위해 발전소에서 전력을 생산하여 송전용 변전소를 통해 특고압 예컨대, 154kV, 345kV, 765kV로 변환하여 장거리 전력 전달과정을 거쳐서 전력을 송신하고 있다.Looking at the power transmission of Korea with reference to FIG. 1, in Korea, power is produced at a power plant to supply power to industries and homes, and converted into extra high voltage, such as 154kV, 345kV, 765kV, through a transmission substation, to deliver long-distance power. Power is being transmitted through the process.

이 특고압을 배전용 변전소를 통해 22.9kV로 변환하여 일부 대규모 산업체에 공급하고, 지상변압기 및 주상변압기를 통해 산업·가정에 220V로 변환하여 전력을 공급하고 있다.This extra-high voltage is converted into 22.9kV through distribution substations and supplied to some large-scale industries, and 220V is converted into industrial and household power through ground transformers and pole transformers.

일반적인 최종 소비자가 전력을 사용하기 위해서는 220V를 공급받아야 하며, 이 역할을 22.9kV/380V(선간전압 기준)로 전압을 변형시켜주는 지상변압기, 주상변압기가 수행하게 되는데, 선간전압 기준 380V를 각 상을 중성점과 연결하면 380V/1.714=220V로 변환된다.In order for the general end consumer to use power, 220V must be supplied, and this role is performed by ground transformers and pole transformers that transform the voltage into 22.9kV/380V (line-to-line voltage standard). When connected to the neutral point, it is converted to 380V/1.714=220V.

각 산업 및 가정에 전력을 공급하기 위해 옥내·옥외에 구성된 배전반에서 R상-N상, S상-N상, T상-N상으로 전력선을 연결하여 부하에 공급되지만, 기존 전력선 분배의 부적절함, 추가 부하의 한 상에 중점적인 연결, 무수히 많은 부하에 대한 측정의 어려움 등에 따라 상 별로 발생하는 전류의 불평형이 발생하고 있다.In order to supply power to each industry and home, power lines are connected to the load by connecting power lines in R-phase-N-phase, S-phase-N-phase, and T-phase-N-phase in a switchboard configured indoors and outdoors, but the distribution of existing power lines is inappropriate. However, due to the intensive connection of one phase of the additional load and the difficulty of measuring a myriad of loads, there is an unbalance of the current that occurs for each phase.

한편, 2010년06월25일자로 공고된 특허 등록번호 10-0966126호(배전반 디지탈콘트롤러)에 따르면, "배전반 고압반내 변압기에서 저압반으로 인입되는 각 상별 인입전류량을 측정하는 상별전력계측기 및 저압반에서 부하에 전원공급하는 각 상별 전류량을 측정하는 상별전력계측기에서 측정된 각 상별 전류량 정보데이터를 UTP(Unshielded Twisted Pair)케이블을 통하여 공급받아 저압반으로 인입되는 각 상별 불평형 및 저압반에서 부하에 전원공급하는 각 상별 불평형을 모니터에 디스플레이하며, 사용자입력장치에서 관리자가 입력한 상불평형률 기준값을 초과할 경우 상불평형 개선을 위해 무정전전원공급장치의 축전 전원의 공급 여부를 결정하며, 상불평형이 발생한 부하 중 상불평형을 보상하여야할 상별부하절체개폐기에 제어신호를 발생하여 배전반내 저압반에서 부하에 전원을 공급하는 상별 인입전원을 무정전전원공급장에 축전된 전원으로 상별부하절체개폐기를 통해 절체하며, 고압반내 변압기에서 저압반으로 인입되는 각 상별 인입전류량을 측정하는 상별전력계측기를 통해 상불평형률을 계산하여 상불평형률이 사용자입력장치를 통해 입력된 상불평형률 기준값의 초과 여부에 따라 무정전전원 공급장치 전원의 사용 여부 및 상별부하절체개폐기를 통해 무정전전원공급장치의 축전 전력의 추가 공급을 판단 및 제어하는 마이크로프로세서로 구성된 통합컨트롤러를 특징으로 하는 배전반 디지탈콘트롤러."라고 개시된 바가 있다.On the other hand, according to Patent Registration No. 10-0966126 (Switchboard Digital Controller) announced on June 25, 2010, "Phase-specific power meter and low-voltage panel that measure the amount of incoming current for each phase drawn from the transformer in the high-voltage panel to the low-voltage panel in the distribution panel. The current amount information data for each phase measured by a phase-specific power meter that measures the amount of current supplied to the load in each phase is supplied through a UTP (Unshielded Twisted Pair) cable, and the unbalance of each phase that is introduced into the low voltage panel and power from the low voltage panel is supplied to the load. The unbalance of each phase that is supplied is displayed on the monitor, and if it exceeds the reference value of the phase unbalance rate entered by the administrator in the user input device, it determines whether to supply the storage power of the uninterruptible power supply to improve the phase unbalance, and phase unbalance occurs. By generating a control signal to the phase-by-phase load transfer switch to compensate for the phase imbalance among the loads, the incoming power for each phase that supplies power to the load from the low-voltage panel in the switchboard is transferred to the power stored in the uninterruptible power supply station through the phase-by-phase load transfer switch. , Uninterruptible power supply according to whether the phase unbalance rate exceeds the reference value of the phase unbalance rate input through the user input device by calculating the phase unbalance rate through a phase-by-phase power meter that measures the amount of incoming current for each phase drawn from the transformer in the high-voltage panel to the low-voltage panel. A switchboard digital controller characterized by an integrated controller consisting of a microprocessor that determines and controls the additional supply of storage power to the uninterruptible power supply through the use of power supply and the phase-by-phase load transfer switch."

특허 등록번호 10-0966126호(배전반 디지탈콘트롤러)Patent registration number 10-0966126 (switchboard digital controller)

그러나, 도 2 및 도 4에 나타낸 바와 같이, 시공보수불량, 과부하, 기자재(의 제작불량, 자연열화, 부식), 자연현상 순으로 원인에 따른 정전발생이 일어났다.However, as shown in Figs. 2 and 4, a power failure occurred according to the cause in the order of poor construction and repair, overload, equipment (failure in manufacturing, natural deterioration, corrosion), and natural phenomena.

이러한 정전원인을 기술적으로 분석해보면, 상불평형에 따른 한 상에 대한 과부하로 인한 사고 야기, 변압기의 해당 상의 권선온도 상승에 따른 절연력 감쇄, 불필요한 변압기 동손 증가에 따른 손실 증대 등의 문제를 발생시키고 있고, 모터류 부하에 의한 리액턴스 증가로 발생하는 지상 무효전력에 의해 저역률이 발생하여 변압기 측면에서는 더 많은 전력량을 사용하고 있고 무효전력에 따른 전압강하, 부하율 증가 또한 발생하고 있다는 점을 확인할 수 있다.Technical analysis of this cause of power failure causes problems such as causing an accident due to an overload on a single phase due to phase imbalance, attenuation of insulation power due to an increase in the winding temperature of the corresponding phase of the transformer, and an increase in loss due to an increase in unnecessary transformer copper loss. In addition, it can be seen that a low power factor is generated by ground reactive power generated by an increase in reactance caused by the motor load, so that a larger amount of power is used from the side of the transformer, and voltage drop due to reactive power and an increase in the load factor are also occurring. .

하지만, 일반 산업 및 가정으로 전력을 공급하는 배전용 변압기 측에서는 이를 상시 감시할 수 없는 상황이 지속되고 있어 평상 시 사고를 방지하고 효율적인 부하관리가 불가능하며, 사고 발생 시 사고 원인을 찾기가 매우 어려운 문제점이 있다.However, the situation where it is not always possible to monitor the power distribution transformers supplying power to general industries and homes continues, so it is impossible to prevent accidents and efficiently manage loads, and it is very difficult to find the cause of the accident when an accident occurs There is this.

본원발명은 상술한 문제점들을 해소하기 위한 것으로, 도 3에 나타낸 바와 같이, 상불평형 및 저역률을 보상할 수 있고 변압기 2차측의 전력상태를 확인할 수 있는 시스템을 지상변압기 내부 혹은 외부 부착형으로 개발하여 불필요한 전력소모를 없애고, 부하상태의 감시를 통한 사고 방지를 구현하고자 한 무효전력보상형 지상변압기를 제공하는데 그 목적이 있다.The present invention is to solve the above-described problems, and as shown in FIG. 3, a system capable of compensating for phase unbalance and low power factor and to check the power state of the secondary side of the transformer is developed as an internal or external attachment type of a ground transformer. The purpose of this is to provide a reactive power compensation type ground transformer that eliminates unnecessary power consumption and implements accident prevention through monitoring of load conditions.

상기 목적을 달성하기 위한 본 발명은 전원측과 부하측 사이에 직렬로 연결된 변류기(11; Current Transformer); 상기 변류기와 부하측 사이에 병렬로 연결된 변압기(12; Power Transformer); 상기 변압기(12)와 부하측 사이에 병렬로 일단이 연결된 필터링 리액터(13; Filtering Reactor); 일단이 상기 필터링 리액터(13)의 타단에 직렬로 연결된 차단기(15); 일단이 상기 차단기(15)의 타단에 직렬로 연결된 스무딩(Smoothing)용 리액터(19; Reactor); 상기 스무딩(Smoothing)용 리액터(19; Reactor)의 타단에 직렬로 연결되고, 트랜지스터, 다이오드, 콘덴서로 이루어진 전압생성부(30); 상기 전압생성부(30)의 입력단에 연결되고, 전압/전류 센싱부(21), 메인제어부(22), 필터링 및 데이터 수신부(23)를 구비한 제어기(20); 상기 전압생성부(30)의 출력단에 연결되고, 복수개의 트랜지스터로 이루어진 MOSFET(40); 일단이 상기 필터링 리액터(13; Filtering Reactor)와 상기 차단기(15) 사이에 병렬로 연결된 접촉기(16); 일단이 차단기(15)와 스무딩(Smoothing)용 리액터(19; Reactor) 사이에 병렬로 연결된 돌입전류 억제저항(17; Precharging resistor); 상기 접촉기(16)의 일단에 직렬로 연결된 필터링 커패시터(14; Filtering Capacitor), 상기 돌입전류 억제저항(17; Precharging resistor)의 일단에 직렬로 연결된 필터링 커패시터(18; Filtering Capacitor)를 포함하고; 상기 접촉기(16)의 타단과 상기 돌입전류 억제저항(17)의 타단이 직렬로 연결된 것을 특징으로 한다.The present invention for achieving the above object is a current transformer (11; Current Transformer) connected in series between the power side and the load side; A transformer 12 connected in parallel between the current transformer and the load side; A filtering reactor 13 having one end connected in parallel between the transformer 12 and the load side; A circuit breaker 15 having one end connected in series to the other end of the filtering reactor 13; A reactor for smoothing (19; Reactor) having one end connected in series to the other end of the circuit breaker 15; A voltage generator 30 connected in series to the other end of the smoothing reactor 19 and comprising a transistor, a diode, and a capacitor; A controller 20 connected to the input terminal of the voltage generating unit 30 and having a voltage/current sensing unit 21, a main control unit 22, and a filtering and data receiving unit 23; A MOSFET 40 connected to the output terminal of the voltage generator 30 and comprising a plurality of transistors; A contactor (16) having one end connected in parallel between the filtering reactor (13) and the circuit breaker (15); An inrush current suppression resistor 17 connected in parallel between the circuit breaker 15 and the reactor 19 for smoothing; A filtering capacitor 14 connected in series to one end of the contactor 16, and a filtering capacitor 18 connected in series to one end of the inrush current suppressing resistor 17; The other end of the contactor 16 and the other end of the inrush current suppression resistor 17 are connected in series.

실시예에서, 상기 MOSFET(40) 대신에, IGBT(Insulated gate bipolar transistor)를 구비하는 것이다.In the embodiment, instead of the MOSFET 40, an insulated gate bipolar transistor (IGBT) is provided.

본 발명의 바람직한 효과에 따르면 다음과 같은 장점이 있다.According to a preferred effect of the present invention, there are advantages as follows.

1)기술적 측면1) Technical aspect

- 전압형 컨버터 방식의 시스템 사이즈 최소화 및 지상변압기 내·외부 적용을 위한 구조 설계가 핵심인 기술로, 주상변압기 및 신재생 에너지의 저압단 등 협소한 공간에 추가 적용할 수 있는 원천기술을 확보할 수 있는 장점이 있고, -With the core technology of minimizing the system size of the voltage converter method and structural design for internal and external application of ground transformers, it is possible to secure source technology that can be additionally applied in narrow spaces such as pole-phase transformers and low-voltage stages of renewable energy. Has the advantage of being able to

- 지상변압기에 적용 개발이 완료된 후 주상변압기의 동 전봇대에 거치형으로도 공급이 가능하여 기술확대 및 매출증대에 기여하는 장점이 있으며, -It has the advantage of contributing to technology expansion and sales increase as it can be supplied as a stationary type to the copper pole of a pole transformer after development is completed.

- 당 개발 시스템은 변압기 저압측의 전압값 & 전류값 센싱 및 분석, 메인 프로세서칩 내부의 프로그래밍, 기능 구현을 위한 제어 알고리즘, 전력전자 및 DC Capacitor의 사양설계 및 내부배치, 전력상태 감시를 위한 HMI 기술 등 여러 분야의 집합체로 개발하였으므로 FACTS(유연송전시스템) 분야에 활용이 가능한 장점이 있다.-This development system senses and analyzes voltage and current values on the low-voltage side of the transformer, programming inside the main processor chip, control algorithms for function implementation, specification design and internal arrangement of power electronics and DC capacitors, and HMI for power status monitoring. Since it was developed as an aggregate of various fields such as technology, it has the advantage of being able to be used in the field of FACTS (flexible transmission system).

2)경제 산업적 측면2) Economic and industrial aspects

- 지상변압기 내부 혹은 외부 부착형으로 결합형 지상변압기 및 상불평형 & 역률 보상 시스템 자체로 판매가 가능하며, 향후 공급확대 시 매출증대 및 배전계통의 전력품질 상태 감시에도 큰 활용을 도모할 수 있고, -It is possible to sell as a combined ground transformer as an internal or external attachment type of the ground transformer and the phase unbalance & power factor compensation system itself, and it can be used to increase sales and monitor the power quality status of the distribution system when supply is expanded in the future.

- 지상변압기의 상시 전력상태 감시를 통한 이상상태 파악 및 사고 발생 시의 신속한 원인 파악으로 변압기 고장 예방 및 정전시간 최소화할 수 있으며, -It is possible to prevent transformer failure and minimize power outage time by identifying abnormal conditions through constant power status monitoring of ground transformers and quickly identifying causes in the event of an accident.

- 상불평형 보상을 통한 변압기 고장 예방 및 수명 극대화를 기할 수 있으며, -It is possible to prevent transformer failure and maximize the lifespan through phase unbalance compensation.

- 상불평형 보상 및 역률 감소를 통한 변압기손실을 감소시키며, -Reduce transformer losses through phase unbalance compensation and power factor reduction,

- 지상변압기 고장 최소화로 정전으로 인한 피해금액 최소화 뿐만 아니라, 사회적 불편요소 해소, 안정적인 전기공급을 통한 한국전력의 고객 만족도 향상 또한 꾀할 수 있다.-By minimizing the breakdown of ground transformers, it not only minimizes the amount of damage caused by power outages, but also solves social inconveniences and improves customer satisfaction through stable electricity supply.

도 1은 대한민국의 전력송신현황을 나타낸 구성도.
도 2는 대한민국의 저압정전사례를 원인별 분석한 그래프.
도 3은 본 발명에 따른 무효전력 보상형 지상변압기의 기본적인 원리를 설명하기 위한 블록도.
도 4는 대한민국의 지상변압기의 열화 관련 뉴스를 나타낸 사진.
도 5는 본 발명에 따른 무효전력 보상형 지상변압기의 개발을 위한 함수 및 알고리즘을 나타낸 도면.
도 6은 본 발명에 따른 무효전력 보상형 지상변압기의 개발을 위한 함수 및 알고리즘을 나타낸 도면.
도 7은 본 발명에 따른 무효전력 보상형 지상변압기의 개발을 위한 VSC 방식의 PS-CAD 시뮬레이션 상 각 제어부 프로그래밍 구성을 나타낸 블록도.
도 8은 본 발명에 따른 무효전력 보상형 지상변압기의 주요 구성을 나타낸 블록도.
도 9는 본 발명에 따른 무효전력 보상형 지상변압기에서 메인제어부의 구성을 세부적으로 나타낸 블록도.
도 10은 본 발명에 따른 무효전력 보상형 지상변압기의 공장내 성능시험환경 구축을 예시한 블록도.
Figure 1 is a configuration diagram showing the power transmission status of the Republic of Korea.
Figure 2 is a graph analyzing the case of low-voltage blackout in Korea by cause.
3 is a block diagram for explaining the basic principle of the reactive power compensation type ground transformer according to the present invention.
Figure 4 is a photograph showing the news related to the deterioration of the ground transformer of the Republic of Korea.
5 is a diagram showing a function and an algorithm for the development of a reactive power compensation type ground transformer according to the present invention.
6 is a diagram showing a function and an algorithm for the development of a reactive power compensation type ground transformer according to the present invention.
7 is a block diagram showing the programming configuration of each control unit in the PS-CAD simulation of the VSC method for the development of the reactive power compensation type ground transformer according to the present invention.
Figure 8 is a block diagram showing the main configuration of the reactive power compensation type ground transformer according to the present invention.
9 is a block diagram showing in detail the configuration of the main control unit in the reactive power compensation type ground transformer according to the present invention.
10 is a block diagram illustrating the construction of a performance test environment in a factory of a reactive power compensation type ground transformer according to the present invention.

이하, 첨부된 도면을 참조하여 본 발명을 상세히 설명하도록 하고, 무효전력 보상형 지상변압기의 구성을 먼저 살펴보도록 한다.Hereinafter, the present invention will be described in detail with reference to the accompanying drawings, and a configuration of a reactive power compensation type ground transformer will be first described.

도 8은 본 발명에 따른 무효전력 보상형 지상변압기의 주요 구성을 나타낸 블록도이다.8 is a block diagram showing the main configuration of the reactive power compensation type ground transformer according to the present invention.

도 8을 참조하면, 전원측과 부하측 사이에 직렬로 연결된 변류기(11; Current Transformer)가 구비되고, 상기 변류기와 부하측 사이에 병렬로 연결된 변압기(12; Power Transformer)가 구비된다.Referring to FIG. 8, a current transformer 11 connected in series is provided between the power side and the load side, and a power transformer 12 connected in parallel between the current transformer and the load side is provided.

상기 변압기(12)와 부하측 사이에 병렬로 일단이 연결된 필터링 리액터(13; Filtering Reactor)와, 일단이 상기 필터링 리액터(13)의 타단에 직렬로 연결된 차단기(15)와, 일단이 상기 차단기(15)의 타단에 직렬로 연결된 스무딩(Smoothing)용 리액터(19; Reactor)가 구비된다.A filtering reactor 13 having one end connected in parallel between the transformer 12 and the load side; a circuit breaker 15 having one end connected in series to the other end of the filtering reactor 13; and a circuit breaker 15 having one end connected to the other end of the filtering reactor 13 in series. A reactor for smoothing (19; Reactor) connected in series to the other end of) is provided.

상기 스무딩(Smoothing)용 리액터(19; Reactor)의 타단에 직렬로 연결되고, 트랜지스터, 다이오드, 콘덴서로 이루어진 전압생성부(30)와, 상기 전압생성부(30)의 입력단에 연결되고, 전압/전류 센싱부(21), 메인제어부(22), 필터링 및 데이터 수신부(23)를 구비한 제어기(20)가 구비된다.The smoothing reactor 19 is connected in series to the other end of the reactor, a voltage generator 30 made of a transistor, a diode, and a capacitor, and connected to the input terminal of the voltage generator 30, and voltage/ A controller 20 having a current sensing unit 21, a main control unit 22, and a filtering and data receiving unit 23 is provided.

상기 전압생성부(30)의 출력단에 연결되고, 복수개의 트랜지스터로 이루어진 MOSFET(40)와, 일단이 상기 필터링 리액터(13; Filtering Reactor)와 상기 차단기(15) 사이에 병렬로 연결된 접촉기(16)가 구비된다.A contactor (16) connected to the output terminal of the voltage generator (30), a MOSFET (40) composed of a plurality of transistors, and one end connected in parallel between the filtering reactor (13) and the circuit breaker (15) Is equipped.

일단이 차단기(15)와 스무딩(Smoothing)용 리액터(19; Reactor) 사이에 병렬로 연결된 돌입전류 억제저항(17; Precharging resistor)와, 상기 접촉기(16)의 일단에 직렬로 연결된 필터링 커패시터(14; Filtering Capacitor), 상기 돌입전류 억제저항(17; Precharging resistor)의 일단에 직렬로 연결된 필터링 커패시터(18; Filtering Capacitor)를 포함하여 구성된다. 여기서, 상기 접촉기(16)의 타단과 상기 돌입전류 억제저항(17)의 타단이 직렬로 연결된다.An inrush current suppression resistor 17 connected in parallel between the circuit breaker 15 and the reactor 19 for smoothing, and a filtering capacitor 14 connected in series to one end of the contactor 16. ; Filtering Capacitor), and a filtering capacitor 18 connected in series to one end of the inrush current suppressing resistor 17 (precharging resistor). Here, the other end of the contactor 16 and the other end of the inrush current suppression resistor 17 are connected in series.

한편, 상기 MOSFET(40) 대신에, IGBT(Insulated gate bipolar transistor)를 구비할 수 있다.Meanwhile, instead of the MOSFET 40, an insulated gate bipolar transistor (IGBT) may be provided.

위와 같은 구성에서 메인제어부의 구성을 세부적으로 살펴본다.In the above configuration, look at the configuration of the main control unit in detail.

도 9는 본 발명에 따른 무효전력 보상형 지상변압기에서 메인제어부의 구성을 세부적으로 나타낸 블록도이다.9 is a block diagram showing in detail the configuration of a main control unit in the reactive power compensation type ground transformer according to the present invention.

도 9를 참조하면, 복수개의 연결포트, 외부 트리커 포트를 구비하고, FPGA(field programmable gate array), 상기 연결포트 별로 할당된 복수개의 신호조절기, 상기 신호조절기로 제어신호를 전달하는 두개의 AD컨버터(ADC), 모니터링신호출력을 위한 하나의 DA컨버터(DAC), 상기 FPGA로부터 수신된 신호처리를 위한 디지털신호처리기(DSP), 상기 FPGA에 연결된 두개의 메모리(RAM), 각 내부 구성요소로 전원을 공급하는 SMPS가 구비된다.Referring to FIG. 9, a field programmable gate array (FPGA), a plurality of signal controllers allocated for each connection port, and two ADs that transmit control signals to the signal controller, each having a plurality of connection ports and an external trigger port. Converter (ADC), one DA converter (DAC) for monitoring signal output, digital signal processor (DSP) for signal processing received from the FPGA, two memories (RAM) connected to the FPGA, each internal component SMPS to supply power is provided.

상기 FPGA는 릴레이출력신호(RELAY OUT), 제어신호를 출력하고, 상기 디지털신호처리기를 통해서 MOSFET신호, 시리얼신호(RS232/RS485)를 출력한다.The FPGA outputs a relay output signal (RELAY OUT) and a control signal, and outputs a MOSFET signal and a serial signal (RS232/RS485) through the digital signal processor.

상술한 바와 같은 무효전력 보상용 지상변압기를 시험하는 시스템구성은 도 10과 같이 예시할 수 있다.The system configuration for testing the ground transformer for reactive power compensation as described above can be illustrated as shown in FIG. 10.

도 10을 참조하면, 시험용 시스템은 시험용 변압기, 차단기, 다수의 접촉기, 무효전류 발생용 변압기로 이루어지고, 공장 내 시험환경을 구축(지상변압기, 다수의 개발 시스템 , R-L-C 부하 등으로 구성)함으로써, 다양한 상불평형 및 무효전력 발생 조건하에서의 상불평형 및 무효전력 보상 기능 검증을 위한 기능을 수행한다.Referring to FIG. 10, the test system is composed of a test transformer, a circuit breaker, a plurality of contactors, and a transformer for generating reactive current, and by establishing a test environment in the factory (consisting of a ground transformer, a plurality of development systems, RLC loads, etc.), It performs a function to verify the phase unbalance and reactive power compensation function under various phase unbalance and reactive power generation conditions.

한편, 전술한 바와 같은 본 발명에 따른 무효전력보상용 변압기를 개발하기 위한 기초설계 및 상불평형 및 무효전류 제어 솔루션 & 알고리즘을 살펴보면 다음과 같다.Meanwhile, a basic design and a phase unbalance and reactive current control solution & algorithm for developing a reactive power compensation transformer according to the present invention as described above are as follows.

도 5와 도 6에서 나타낸 바와 같이, 전압형 컨버터(Voltage Sourced Converter)방식을 시스템의 기본 기술로 사용하고, PS-CAD 시뮬레이션을 통해 개발 시스템의 제어기법을 GUI(Graphic User Interface; 수식을 그림으로 표현하는 방법) 환경으로 1차로 설계한다.As shown in Figs. 5 and 6, a voltage sourced converter method is used as the basic technology of the system, and the control method of the development system is used as a graphic user interface (GUI) through PS-CAD simulation. How to express) Design first with the environment.

여기서, VSC 방식의 PS-CAD 시뮬레이션 상 각 제어부 프로그래밍 구성은 도 7과 같이 예시할 수 있다.Here, the programming configuration of each control unit in the VSC type PS-CAD simulation can be illustrated as shown in FIG. 7.

11; 변류기, CT 12; 변압기, PT
13; 필터링 리액터 14, 18; 필터링커패시터
15; 차단기 16; 접촉기
17; 돌입전류억제저항 19; 스무딩용 리액터
20; 제어부 21; 전압/전류 센싱부
22; 메인제어부 23; 필터링및데이터수신부
30; 전압생성부 40; MOSFET or IGBT
11; Current transformer, CT 12; Transformer, PT
13; Filtering reactors 14, 18; Filtering capacitor
15; Breaker 16; Contactor
17; Inrush current suppression resistance 19; Reactor for smoothing
20; Control unit 21; Voltage/current sensing unit
22; Main control unit 23; Filtering and data receiving unit
30; Voltage generator 40; MOSFET or IGBT

Claims (2)

전원측과 부하측 사이에 직렬로 연결된 변류기(11; Current Transformer);
상기 변류기와 부하측 사이에 병렬로 연결된 변압기(12; Power Transformer);
상기 변압기(12)와 부하측 사이에 병렬로 일단이 연결된 필터링 리액터(13; Filtering Reactor);
일단이 상기 필터링 리액터(13)의 타단에 직렬로 연결된 차단기(15);
일단이 상기 차단기(15)의 타단에 직렬로 연결된 스무딩(Smoothing)용 리액터(19; Reactor);
상기 스무딩(Smoothing)용 리액터(19; Reactor)의 타단에 직렬로 연결되고, 트랜지스터, 다이오드, 콘덴서로 이루어진 전압생성부(30);
상기 전압생성부(30)의 입력단에 연결되고, 전압/전류 센싱부(21), 메인제어부(22), 필터링 및 데이터 수신부(23)를 구비한 제어기(20);
상기 전압생성부(30)의 출력단에 연결되고, 복수개의 트랜지스터로 이루어진 MOSFET(40);
일단이 상기 필터링 리액터(13; Filtering Reactor)와 상기 차단기(15) 사이에 병렬로 연결된 접촉기(16);
일단이 차단기(15)와 스무딩(Smoothing)용 리액터(19; Reactor) 사이에 병렬로 연결된 돌입전류 억제저항(17; Precharging resistor);
상기 접촉기(16)의 일단에 직렬로 연결된 필터링 커패시터(14; Filtering Capacitor), 상기 돌입전류 억제저항(17; Precharging resistor)의 일단에 직렬로 연결된 필터링 커패시터(18; Filtering Capacitor)를 포함하고,
상기 접촉기(16)의 타단과 상기 돌입전류 억제저항(17)의 타단이 직렬로 연결된 것을 특징으로 하는 무효전력 보상형 지상변압기.
A current transformer 11 connected in series between the power side and the load side;
A transformer 12 connected in parallel between the current transformer and the load side;
A filtering reactor 13 having one end connected in parallel between the transformer 12 and the load side;
A circuit breaker 15 having one end connected in series to the other end of the filtering reactor 13;
A reactor for smoothing (19; Reactor) having one end connected in series to the other end of the circuit breaker 15;
A voltage generator 30 connected in series to the other end of the smoothing reactor 19 and comprising a transistor, a diode, and a capacitor;
A controller 20 connected to the input terminal of the voltage generating unit 30 and having a voltage/current sensing unit 21, a main control unit 22, and a filtering and data receiving unit 23;
A MOSFET 40 connected to the output terminal of the voltage generator 30 and comprising a plurality of transistors;
A contactor (16) having one end connected in parallel between the filtering reactor (13) and the circuit breaker (15);
An inrush current suppression resistor 17 connected in parallel between the circuit breaker 15 and the reactor 19 for smoothing;
A filtering capacitor 14 connected in series to one end of the contactor 16, and a filtering capacitor 18 connected in series to one end of the inrush current suppressing resistor 17,
Reactive power compensation type ground transformer, characterized in that the other end of the contactor (16) and the other end of the inrush current suppression resistor (17) are connected in series.
청구항 1에 있어서,
상기 MOSFET(40) 대신에, IGBT(Insulated gate bipolar transistor)를 구비하는 것을 특징으로 하는 무효전력 보상형 지상변압기.



The method according to claim 1,
Instead of the MOSFET 40, a reactive power compensation type ground transformer comprising an IGBT (Insulated gate bipolar transistor).



KR1020190137676A 2019-10-31 2019-10-31 Reactive Power Compensation type Ground Transformer KR102340636B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020190137676A KR102340636B1 (en) 2019-10-31 2019-10-31 Reactive Power Compensation type Ground Transformer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020190137676A KR102340636B1 (en) 2019-10-31 2019-10-31 Reactive Power Compensation type Ground Transformer

Publications (2)

Publication Number Publication Date
KR20210051862A true KR20210051862A (en) 2021-05-10
KR102340636B1 KR102340636B1 (en) 2021-12-20

Family

ID=75917778

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020190137676A KR102340636B1 (en) 2019-10-31 2019-10-31 Reactive Power Compensation type Ground Transformer

Country Status (1)

Country Link
KR (1) KR102340636B1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102502428B1 (en) * 2022-04-14 2023-02-23 주식회사 태화 Earth leakage breaker in substation where transformer is installed

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102655598B1 (en) * 2022-01-11 2024-04-09 (주)파워닉스 Device providing lagging reactive power and method for controlling temperature correction thereof

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003264932A (en) * 2002-03-08 2003-09-19 Osaka Gas Co Ltd High-speed current limiting and interrupting device for electric power system interconnection
JP2009219260A (en) * 2008-03-11 2009-09-24 Tokyo Electric Power Co Inc:The Voltage regulator
KR100966126B1 (en) 2010-03-18 2010-06-25 심강문 The digital controller pannel
KR101529889B1 (en) * 2015-04-10 2015-06-18 한양전공주식회사 Switchgear capable of power factor correction
KR101670080B1 (en) * 2016-02-19 2016-10-27 (주)신명전력산업 Distribution board capable of power factor compensation

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003264932A (en) * 2002-03-08 2003-09-19 Osaka Gas Co Ltd High-speed current limiting and interrupting device for electric power system interconnection
JP2009219260A (en) * 2008-03-11 2009-09-24 Tokyo Electric Power Co Inc:The Voltage regulator
KR100966126B1 (en) 2010-03-18 2010-06-25 심강문 The digital controller pannel
KR101529889B1 (en) * 2015-04-10 2015-06-18 한양전공주식회사 Switchgear capable of power factor correction
KR101670080B1 (en) * 2016-02-19 2016-10-27 (주)신명전력산업 Distribution board capable of power factor compensation

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102502428B1 (en) * 2022-04-14 2023-02-23 주식회사 태화 Earth leakage breaker in substation where transformer is installed

Also Published As

Publication number Publication date
KR102340636B1 (en) 2021-12-20

Similar Documents

Publication Publication Date Title
CN107340455B (en) Single-phase broken line fault identification method and application of high-voltage circuit of power distribution network
AU2007324283C1 (en) Power supply monitoring system
EP2672603A1 (en) A device for connecting a single-phase device into a multiphase electric network
KR20210051862A (en) Reactive Power Compensation type Ground Transformer
Kakilli System analysis with the MVA Method for symmetrical three-phase faults
CN2938505Y (en) Intelligent reactive compensation distribution box
CN204992272U (en) Dual supply massive quantity power supply and high expanded pull -out type measuring equipment that does not repeat of low meter that supplies
Dhakulkar et al. Inspection of Voltage Sags and Voltage Swells Incident in Power Quality Problems—A Review
Elkholy et al. Identifying the Rating of the Unified Power Controller According to Unbalanced Distribution System Requirements
Liu et al. Probabilistic estimation of propagation of unbalance in distribution network with asymmetrical loads
Ramachandran et al. A review on basic concepts and important standards of power quality in power system
CN204992260U (en) Expanded not repeated fixed measuring equipment of single mains operated
Kamble et al. Classification of voltage sags in distribution systems due to short circuit faults
CN204992273U (en) Expanded pull -out type measuring equipment that does not repeat of dual power supply
KR100532925B1 (en) Detection techniques of line-to-earth fault section in ungrounded network base on distribution automation
JP2016063616A (en) Electric power system, small-output power generation unit, and power storage unit
CN111987790B (en) Get electric installation in looped netowrk cabinet
Ahmed et al. Design and Simulation of Improved On Load Tap Changer (OLTC) to Mitigate Voltage Sag/Swell
Khazaee et al. Harmonic Evaluation of Distribution Transformers Based on Real-Time Data of Smart Meters
US20230136795A1 (en) Network protector that detects an error condition
Prathibha et al. An overview of power quality issues in smart grid
CN205005006U (en) Single power massive quantity power supply and high expanded not repeated fixed measuring equipment of low meter that supplies
Gerkusov et al. Effect of Unbalanced Load on Electrical Energy Losses in Distribution Grids with a Voltage of 0.4-20 Kv
Zeggai et al. Power System Analysis of Seawater Desalination Plant in Algeria with Different Load Scenarios.
Bijwar et al. Voltage Protection and Harmonics Cancellation in Low Voltage Distribution Network

Legal Events

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