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Song, Hwachang,Lee, Byongjun,Kwon, Sae-Hyuk,Ajjarapu, V. IEEE 2003 IEEE transactions on power systems Vol.18 No.4
This paper presents a new concept of reactive reserve-based contingency constrained optimal power flow (RCCOPF) for voltage stability enhancement. This concept is based on the fact that increase in reactive reserves is effective for enhancement of voltage stability margins of post-contingent states. In this paper, the proposed algorithm is applied to voltage stability margin of interface flow. Interface flow limit, in the open access environment, can be a main drawback. RCCOPF for enhancement of interface flow margin is composed of two modules, modified continuation power flow (MCPF) and optimal power flow (OPF). These modules are recursively performed until satisfying the required margin of interface flow in the given voltage stability criteria.
Security Constrained Economic Dispatch (SCED) Considering Load Level Uncertainty
Hwachang Song,BenJeMar-Hope Flores 한국지능시스템학회 2022 INTERNATIONAL JOURNAL of FUZZY LOGIC and INTELLIGE Vol.22 No.2
In power system operation, security constrained economic dispatch (SCED) is used to providea reference point for the next time period for each dispatchable generator, and load forecastingneeds to be involved in the SCED procedure. In real-time operation, forecasting errors and thenonlinearity of the load change might cause undesirable dispatch patterns in terms of systemsecurity. This study presents an SCED that considers the uncertainty of the system load level. For this purpose, a fuzzy model was employed to express the uncertainty in the load levelchange, and a practical two-stage SCED solution method was adopted. In addition, to resolvethe difficulty in determining the reference generation pattern from solutions using this model,a procedure is required to determine the secure upper and lower limits for the dispatchablegenerators as the final SCED outcome. The numerical results were obtained using a 43-bustest system to test the feasibility of the proposed method.
Fuzzy-Enforced Complementarity Constraints in Nonlinear Interior Point Method-Based Optimization
Hwachang Song 한국지능시스템학회 2013 INTERNATIONAL JOURNAL of FUZZY LOGIC and INTELLIGE Vol.13 No.3
This paper presents a fuzzy set method to enforce complementarity constraints (CCs) in a nonlinear interior point method (NIPM)-based optimization. NIPM is a Newton-type approach to nonlinear programming problems, but it adopts log-barrier functions to deal with the obstacle of managing inequality constraints. The fuzzy-enforcement method has been implemented for CCs, which can be incorporated in optimization problems for real-world applications. In this paper, numerical simulations that apply this method to power system optimal power flow problems are included.
Hwachang Song,Rodel D. Dosano,Byongjun Lee 한국지능시스템학회 2009 INTERNATIONAL JOURNAL of FUZZY LOGIC and INTELLIGE Vol.9 No.3
This paper presents a methodology for the classification of power system voltage stability, the trajectory of which to instability is monotonic, using an interior point method based support vector machine (IPMSVM). The SVM based voltage stability classifier can provide real-time stability identification only using the local measurement data, without the topological information conventionally used.
Optimal Parameter Determination for BTB Converters to Enhance Interface Flow Margins
Hwachang Song(송화창),Sungmin Ohn(온성민),Byonghoon Jang(장병훈) 한국지능시스템학회 2011 한국지능시스템학회 학술발표 논문집 Vol.21 No.1
This paper presents a method to determine parameters of BtB converters in terms of the enhancement of interface flow margins. Interface flow margin is by definition a measure of how much active power can be transferred from the external areas to the study area with the fixed load demand, and it is mainly constrained by system voltage stability. BtB (back-to-back) converters are controllable equipments with the active power flow through it, and its DC link in fact can divide the AC systems at the location and hence can reduce the fault current level. This paper first obtains margin sensitivities at the nose point of F-V curves and formulates an optimization problem to update the BtB parameters to improve the margins. This procedure is repeated performed until the required margin enhancement is achieved.
Fuzzy-Enforced Complementarity Constraints in Nonlinear Interior Point Method-Based Optimization
Song, Hwachang Korean Institute of Intelligent Systems 2013 INTERNATIONAL JOURNAL of FUZZY LOGIC and INTELLIGE Vol.13 No.3
This paper presents a fuzzy set method to enforce complementarity constraints (CCs) in a nonlinear interior point method (NIPM)-based optimization. NIPM is a Newton-type approach to nonlinear programming problems, but it adopts log-barrier functions to deal with the obstacle of managing inequality constraints. The fuzzy-enforcement method has been implemented for CCs, which can be incorporated in optimization problems for real-world applications. In this paper, numerical simulations that apply this method to power system optimal power flow problems are included.
Song, Hwachang,Vovos, Panagis N.,Cho, Kang-Wook,Kim, Tae-Sun The Korean Institute of Electrical Engineers 2016 Journal of Electrical Engineering & Technology Vol.11 No.1
This paper presents a method of decision on where bus splitting is needed to reduce fault current level of power systems and to satisfy the fault current constraints. The method employs a modified fault current constrained optimal power flow (FCC-OPF) with X variables for the candidate locations of splitting and for decision making on whether to split or not, it adopts soft-discretization by augmenting inversed U-shaped penalty terms. Also, this paper discusses the procedure on the adequate selection of bus splitting locations based on the results of the modified FCC-OPF, to reduce the total number of the actions taken.
Hwachang Song,Panagis N. Vovos,Kang-Wook Cho,Tae-Sun Kim 대한전기학회 2016 Journal of Electrical Engineering & Technology Vol.11 No.1
This paper presents a method of decision on where bus splitting is needed to reduce fault current level of power systems and to satisfy the fault current constraints. The method employs a modified fault current constrained optimal power flow (FCC-OPF) with X variables for the candidate locations of splitting and for decision making on whether to split or not, it adopts soft-discretization by augmenting inversed U-shaped penalty terms. Also, this paper discusses the procedure on the adequate selection of bus splitting locations based on the results of the modified FCC-OPF, to reduce the total number of the actions taken.