• 한국수자원학회:학술대회논문집
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• 한국수자원학회 1997년도 학술발표회 논문집
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• pp.519-524
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• 1997

• 터널과지하공간
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• 제17권2호
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• pp.90-101
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• 2007

최근 지하공간개발의 증가와 한께 상부저수지에 저장된 물을 하부저수지고 낙하시켜 발전하는 지하양수 발전소의 건설도 지속적으로 이루어지고 있다. 이거한 지하양수발전소를 건설할 때, 구조물의 효율적이고 안전한 설계 시공 및 유지를 위해서 설계단계에서 암석과 암반의 공학적 특성 및 대상지역의 지압상태 등을 명확히 파악하는 것은 매우 중요하다. 본 논문에서 소개하는 양수발전소는 심포 $320{\sim}375m$에서 건설되고 있으며, 구조물의 안정성 검토를 위하여 굴착예정지 암반에 대해 오버코어링법을 이용한 초기응력측정, 공내재하시험 및 암석의 물성시험을 실시하여 설계에 필요한 기초자료를 획득하였다. 이를 바탕으로 수치해석을 실시하여 기존 지보재 설계의 적정성을 판단하였고, 불안정성으로 판정된 부분에 대해서는 추가로 보강설계를 하였다. 추가 보강설계 결과, 공동 전체에서 안정성을 확보하였고 현재 순조롭게 굴착이 이루어지고 있는 상태이다.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2003년도 춘계전력전자학술대회 논문집(1)
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• pp.467-471
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• 2003

The large synchronous motor for the pumped-storage plant(or SFC : Static Frequency Converter) has to be brought up to 100$\%$ rated speed and synchronized with the AC power network. Starting the motor from rest is achieved by switching current into the stator winding so that interaction between this stator current and the rotor flux will cause the correct direction of torque to be developed so that the motor turns in the required direction. Starting ranges of the synchronous motor are divided into three regions. The first region Is at standstill, the second that is called by the forced commutation is from standstill to 5-8$\%$ of rated speed, and the third, which is called by the natural commutation, is from 5-8$\%$ of rated speed to 100$\%$ rated speed. So this paper describes three regions of the control techniques of the pumped-storage synchronous motor drive.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1999년도 하계학술대회 논문집 E
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• pp.2089-2092
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• 1999

Partial discharge(PD) tests were performed both when the pumped storage generator(rated 13.8kV and 220MVA) was on-line and off-line. This generator has been equipped with 12 bus coupler sensors in directional mode. PD tests were conducted using partial discharge analyzer(PDA), partial discharge meter(PDM) and digital partial discharge detector. PDA showed that the patterns of the normalized quantity number(NQN) and the partial discharge magnitude are in accord with on-line and off-line. The insulation condition was estimated by diagnostic tests(off-line) such as PD magnitude and dissipation factor.

• 대한기계학회논문집A
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• 제41권3호
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• pp.225-232
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• 2017

런너, 흡출관 등 양수발전소 수차 부속기기들에 캐비테이션 침식과 피로 균열 등의 손상 발생과 관련하여 많은 정비 사례들이 보고되고 있다. 양수발전소는 급전, 전력계통 안정 등과 같은 부수적 서비스를 제공한다. 이러한 부수적 서비스는 가이드 베인을 작게 열고 운전하는 저개도율 운전을 반복적으로 자주 수행하게 한다. 이러한 저개도율 운전은 수차 부속기기의 손상을 가속시키는 것으로 경험적으로 알려져 있다. 본 연구에서는 양수발전소의 가이드 베인 저개도율 운전이 수차의 캐비테이션과 피로를 가속시키는 효과를 유한요소 유동/응력 해석 및 피로 해석을 통해 정량적으로 평가한다. 평가 결과, 가이드 베인 개도율이 작을수록 캐비테이션 발생 가능성과 수차 효율 저하 가능성이 증가하며, 런너 블레이드 루트부에 최대 응력값을 증가시킴에도 불구하고 저개도율 운전이 피로수명에 미치는 영향은 미미함을 확인하였다.

• Smart Structures and Systems
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• 제29권3호
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• pp.457-473
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• 2022

A high-frequency vibration control method is proposed in this paper for Pumped Storage Power Plants (PSPPs) using Eddy Current Tuned Mass Damper (EC-TMD), based on which a new type of EC-TMD device is designed. The eddy current damper parameters are optimized by numerical simulation. On this basis, physical simulation model tests are conducted to compare and study the effect of structural performance with and without damping, different control strategies, and different arrangement positions of TMD. The test results show that EC-TMD can effectively reduce the control effect under high-frequency vibration of the plant structure, and after the additional damping device forms EC-TMD, the energy dissipation is further realized due to the intervention of eddy current damping, and the control effect is subsequently improved. The Multi-Tuned Mass Damper (MTMD) control strategy broadens the tuning band to improve the robustness of the system, and the vibration advantage is more obvious. Also, some suggestions are made for the placement of the dampers to promote their application.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1991년도 하계학술대회 논문집
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• pp.411-416
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• 1991

Operation simulation is a key factor to evaluate investment and operation in a power utility. Probabilistic production simulation is of major concern. With pumped-storage plant, production simulation is not an easy task, because its economy should fully be exploited. In addition, usual operation interval is a week rather than a day. Most existing models are based on approximate production simulation such as adopting simple priority orders of generations. This study is based on the more elaborate model developed by authors. Further, a policy of weekly coordination is established based on the Maximum Principle. Chronological load curve instead of usual load duration curve is used and the accuracy in simulation is enhahced. Resulting economics are compared. Deviation between these two toad curve is shown.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 제36회 하계학술대회 논문집 A
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• pp.149-151
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• 2005

A new approach considering CO2 air pollution constraints in the long-term generation mix is proposed under uncertain circumstances. A characteristic feature of the presented approach in this paper is what effects give the air pollution constraints in long term best generation mix. Best generation mix problem is formulated by linear programming with fuel and construction cost minimization with load growth, reliability (reserve margin rate) and air pollutionconstraints. The proposed method accommodates the operation of pumped-storage generator. It was assumed in this study that the construction planning of the hydro power plants is given separately from the other generation plans. The effectiveness of the proposed approach is demonstrated by applying to the best generation mix problem of KEPCO-system, which contains nuclear, coal, LNG, oil and pumped-storage hydro plant multi-years.

• 대한전기학회논문지
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• 제34권8호
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• pp.308-316
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• 1985

This paper proposes an analytic tool for long-term generation expansion planning based on the maximum principle. Many research works have been performed in the field of generation expansion planning. But few works can be found with the maxinmum principle. A recently published one worked by professor Young Moon Park et al. shows remarkable improvements in modeling and computation. But this modeling allows only thermal units. This paper has extended Professor Park's model so that the optimal pumped-storage operation is taken into account. So the ability for practical application is enhanced. In addition, the analytic supply-shortage cost function is included. The maximum principle is solved by gradient search due to its simplicity. Every iteration is treated as if mathematical programming such that all controls from the initial to the terminal time are manipulated within the same plane. Proposed methodology is tested in a real scale power system and the simulation results are compared with other available package. Capability of proposed method is fully demonstrated. It is expected that the proposed method can be served as a powerful analytic tool for long-term generation expansion planning.

• 전기학회논문지
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• 제56권8호
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• pp.1343-1350
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• 2007

This paper describes the tests on the reactive power output limit and the Over-Excitation Limiter (OEL) dynamics of a generation unit. The suggested test methods on reactive limit can identify the allowable maximum/minimum reactive power at 100% rated MW in the steady-state unit operation condition. The on-line OEL test method can identify the time characteristics of OEL with the generation output at 50% of the rated MW. These methods are validated by applying to four Yang-Yang pumped storage units with 282 rated MVA each.