전압강하에 대한 전기기기의 운전한계 특성 및 정량화 기법

다국어 초록 (Multilingual Abstract)

The electric power has the characteristics as follows; the demands of customers fluctuate hourly, the production and the demands are occurring at the same time. So the interests about power quality had been increased domestically and internationally.
Because the sensitive nonlinear loads to power quality disturbances of voltage sags and harmonics etc. are prevailing in industry process along with fast development of application technology that use the thyristor and the semiconductor, the economical damage to deterioration of power quality is increasing gradually.
So far, the concerns about power quality had been realized as only power provider's matter. But according as disturbances may occur by either power system or customers that owned electrical power equipment, the power quality is no longer the problem of power providers and was considered as a matter of concern between power providers and customers.
According to these trends, it is required that theorize interaction about the impact of power quality on electric power equipment. And the study that verifies this by a testing is very important.
This paper concentrates on voltage sag that is most frequently occurring among power quality disturbances. This work studies the impact of voltage sag on the operating limits of electric power equipment through a simulation and a testing. Finally, the operating limits curves and the equations of a power acceptability curves for voltage is drawn by a simulation and a testing for selected loads.
Also, for the case study about the impact of voltage sag on the load tripping, surveyed the static and dynamic characteristics of power quality and studied the quantification methods of voltage quality about the operating limits of electric power equipment.
The impact of voltage sag is analyzed by testing electric equipment such as induction motor, contactor and high pressure discharge lamp, etc. which is used mainly in industry. Also the characteristics of operating limits for selected loads under the impact of voltage sag were analyzed by a testing for power quality. The results made the operating limits curves for voltage and formula.
When voltage sag was occurred, the power quality cost index for customers and the estimation index by voltage quality disturbance were developed. Through various cases, it proved that proposed index can have application to real system.
This paper can decide demand levels for power quality that is supplied to customers who have various loads by testing of the electric power equipment. Also the quantification method about equipment investment can be used in technology furtherance through mutual agreement of customers and power providers about power quality demands. And it can be used for the design of electric power equipment, the validity estimation about power quality and the quantification of power quality cost about the disturbances. The compensation equipment of power quality will have spread in industry wide and will be used in the design of the compensation equipment of optimum level. Also, it can activate development industry of power quality.

목차 (Table of Contents)

• 제 1 장 서 론 1
• 1.1 연구의 필요성 1
• 1.2 연구의 동향 3
• 1.3 연구 내용 9
• 제 2 장 전압 품질 지표와 특성 11
• 2.1 전력 품질 외란 11
• 2.2 전압 품질 관련 평가 지표 18
• 제 3 장 전압강하에 대한 전기기기 시뮬레이션 35
• 3.1 유도전동기 (Induction Motor) 35
• 3.2 전자접촉기 (Contactor) 52
• 3.3 고압 방전등 (High Pressure Discharge Lamp) 67
• 제 4 장 전압강하에 대한 전기기기의 평가실험 77
• 4.1 운전한계 특성 실험 시스템 77
• 4.2 Voltage sag 특성 시험 결과 83
• 4.3 CBEMA 전압 특성식 109
• 4.4 시뮬레이션 및 실험 결과 116
• 제 5 장 전압 품질 영향의 정량화 기법 118
• 5.1 기기의 정지 횟수 예측 118
• 5.2 전력품질을 고려한 수용가 모선 가격 계산 127
• 5.3 Voltage Sensitivity Index 135
• 제 6 장 결 론 150
• 6.1 연구결과 150
• 6.2 논문의 기대효과 153
• 참고문헌 154
• 요 지 162