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Hybrid Control System for Managing Voltage and Reactive Power in the JEJU Power System
Sangsoo Seo,Yun-Hyuk Choi,Sang-Gyun Kang,Byongjun Lee,Jeong-Hoon Shin,Tae-Kyun Kim 대한전기학회 2009 Journal of Electrical Engineering & Technology Vol.4 No.4
This paper proposes a hybrid voltage controller based on a hierarchical control structure for implementation in the Jeju power system. The hybrid voltage controller utilizes the coordination of various reactive power devices such as generators, switched shunt devices and LTC to regulate the pilot voltage of an area or zone. The reactive power source can be classified into two groups based on action characteristics, namely continuous and discrete. The controller, which regulates the pilot bus voltage, reflects these characteristics in the coordination of the two types of reactive power source. However, the continuous type source like generators is a more important source than the discrete type for an emergency state such as a voltage collapse, thereby requiring a more reactive power reserve of the continuous type to be utilized in the coordination in order to regulate the pilot bus voltage. Results show that the hybrid controller, when compared to conventional methods, has a considerable improvement in performance when adopted to control the pilot bus voltage of the Jeju island system.
Seo Sangsoo,Lee Byongjun,Kim Tae-Kyun,Song Hwachang The Korean Institute of Electrical Engineers 2005 KIEE International Transactions on Power Engineeri Vol.a5 No.4
The most widely used index for the vulnerable area investigation has been the reactive power margin or sensitivity analysis. But we can only obtain the results of these analyses if the results of load flow are convergent in severe contingencies. Otherwise these methods are not adoptable. This paper presents a good index for overcoming severe contingencies, though the power flow equation is unsolvable using the branch parameter continuation power flow. In simulation, the Korea Electric Power Corporation (KEPCO) Systems are applied.
Sangsoo Seo,Sang-Gyun Kang,Byongjun Lee,Tae-Kyun Kim,Hwachang Song 대한전기학회 2011 Journal of Electrical Engineering & Technology Vol.6 No.2
This paper proposes a methodology using a tool based on the branch-parameter continuation power flow (BCPF) in order to restore the power flow solvability in unsolvable contingencies. A specified contingency from a set of transmission line contingencies is modeled, considering the transient analysis and practice in the Korean power system. This tool traces a solution path that satisfies the power flow equations with respect to the variation of the branch parameter. At a critical point, in which the branch parameter can move on to a maximum value, a sensitivity analysis with a normal vector is performed to identify the most effective compensation. With the sensitivity information, the location of the reactive power compensation is determined and the effectiveness of the sensitivity information is verified to restore the solvability. In the simulation, the proposed framework is then applied to the Korean power system.
서상수(Sangsoo Seo),송성환(Sung-Hwan Song),문영환(Young-Hwan Moon) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.11
전세계적을 풍력발전은 많은 신재생 에너지원 중에서 가장 각광받고 있는 발전 방식이다. 현재 많은 나라에서 풍력발전 설비가 설치 운전되고 있다. 나아가 각 국에서는 지구 온난화 문제 해결을 위해 화석에너지 사용을 줄이려는 노력의 일안으로 풍력발전 분야에 많은 투자를 계획 중에 있다. 이러한 풍력발전은 기존의 발전 방식과 그 특성이 매우 상이하다. 그리고 그 상이한 특성은 풍력발전 단지의 용량이 커짐에 따라 계통에 미치는 영향은 더 확대되게 된다. 따라서 대규모 풍력단지가 주는 영향을 파악하기 위한 많은 계통 해석이 요구된다. 계통해석을 위해서는 정확한 풍력 모델이 필요하며, 지금까지 다양한 노력이 이루어져 왔다. 이에 본 논문은 현재 많이 사용되고 있는 풍력 모델의 특성을 검토해 보고자 한다.
발전기차단 지수를 이용한 지능형 고장파급방지 장치 알고리즘 개발
서상수(Sangsoo Seo),김동준(Dong-Joon Kim),김석주(Seog-Joo Kim),문영환(Young-Hwan Moon) 대한전기학회 2011 대한전기학회 학술대회 논문집 Vol.2011 No.10
This paper presents a algorithm for intelligent generator SPS(Special Protection System) using a index for tripping generator. The proposed index is calculated by PMU(Phasor Measurement Unit) data. It can reflect a state in the power system. In order to use the tripping generator index, a patching matrix is created by off-line study. The patching matrix shows the number of tripping generator with regard to the tripping generator index. The algorithm can set up the tripping generators for the SPS using the matrix. This method is demonstrated by the Korean Power System in 2010.
과도안정도 제약을 고려한 발전기 단자전압 최적 제어 방안에 대한 연구
서상수(Sangsoo Seo) 대한전기학회 2021 전기학회논문지 Vol.70 No.12
In this paper, we propose a method to solve the system overvoltage problem without causing the transient stability problem under light load of the power system. The optimal voltage can be found by applying the operating voltage constraints and transient stability constraints to the existing optimization function which the minimizing losses is the objective function. The method of applying the transient stability constraint is divided into two steps. The first is to find the voltage range of the power plant that satisfies the transient stability. Next, the optimal operating voltage is calculated by considering the derived voltage range as the voltage range constraint of the generator of the optimization function. The calculated the optimal reference voltage of generators can solve the system overvoltage problem without impairing the transient stability in case of a power system light load situation. The effect of the proposed scheme was verified using a light load Korean power system.
서상수(Sangsoo Seo),김대정(Daejeong Kim),최윤혁(Yoon-Hyuk Choi),이병준(Byongjun Lee) 대한전기학회 2011 전기학회논문지 Vol.60 No.4
This paper defines a generator reactive reserve considering power system network. Conventional generator reserve is calculated by the difference between the maximum reactive power output of generator and the current reactive power of generator. However, all generators could not affect on the whole power system. Thus, the effective generators should be selected by sensitivity analysis. The sensitivity depends on network configuration is the relation between generator reactive power outputs and reactive power loads. Using the sensitivity, the effective generator reactive reserve can be calculated.