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Fuzzy-Enforced Complementarity Constraints in Nonlinear Interior Point Method-Based Optimization
송화창 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.
증배형 부하회복 모델을 포함하는 연속법 기반 준정적 해석
송화창(Hwachang Song),Venkatanamana Ajjarapu 제어로봇시스템학회 2008 제어·로봇·시스템학회 논문지 Vol.14 No.2
This paper presents a new continuation-based quasi-steady-state(CQSS) time-domain simulation algorithm incorporating a multiplicative aggregated load model for power systems. The authors" previous paper introduced a CQSS algorithm, which has the robust convergent characteristic near the singularity point due to the application of a continuation method. The previous CQSS algorithm implemented the load restoration in power systems using the exponent-based load recovery model that is derived from the additive dynamic load model. However, the reformulated exponent-based model causes the inappropriate variation of short-term load characteristics when switching actions occur, during time-domain simulation. This paper depicts how to incorporate a multiplicative load restoration model, which does not have the problem of deforming short-term load characteristics, into the time simulation algorithm, and shows an illustrative example with a 39-bus test system.
송화창(Hwachang Song),김영곤(Young-Gon Kim),이병준(Byongjun Lee) 대한전기학회 2008 대한전기학회 학술대회 논문집 Vol.2008 No.11
This paper present a practical method for long-term voltage stability simulation based on a governor-response power flow. Governor-response power flow (GPF) is to model the long-term system response in the interval from 3 to 30 seconds after disturbance. In this paper, it is assumed that the GPF model can capture the system state before load restoration starts in contingent conditions. This paper discusses the applicability of GPF to long-term simulation for voltage stability analysis and then explains the GPF formulation and the procedure of the proposed simulation. In addtion the paper includes the simulation results with the modified New England 39-bus system.