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PV 시스템의 최적 배치 문제를 위한 이산 PSO에서의 규칙 기반 하이브리드 이산화
송화창(Hwachang Song),고재환(Jae-Hwan Ko),최병욱(Byoung-Wook Choi) 한국지능시스템학회 2011 한국지능시스템학회논문지 Vol.21 No.6
본 논문은 배전망에서의 PV (photovoltaic) 발전 시스템의 최적 배치 문제를 이산 입자 군집 최적화 (DPSㅇ,discrete particle swarm optimization)를 이용하여 해를 구할 때 DPSO에 포함되어야 하는 이산화 단계를 위한 하이브리드 이산화 기법의 적용에 대하여 논한다. 이를 위해 PSO 반복단계에서 목적 함수 값과 최적화 속도를 입력 파라미터로 하는 규칙 기반 전문가 시스템을 제안하고 이산 변수를 포함하여 표현되는 PV 시스템 배치 문제의 최적해를 구하는 데 적용하였다. 다수준 이산화를 위하여 간단한 라운딩과 sigmoid 함수를 이용한 3단계 및 5단계 이산화 기법을 하이브리드 형태로 적용하였다. 규칙 기반 전문가 시스템을 적용하여 각 PSO 과정에서 적절한 이산화 기법을 선택함으로써 기존의 DPSO보다 좋은 성능의 최적화가 가능하도록 하였다. This paper discusses the application of a hybrid discretiziation method for the discretization procedure that needs to be included in discrete particle swarm optimization (DPSO) for the problem of allocating PV (photovoltaic) systems onto distribution power systems. For this purpose, this paper proposes a rule-based expert system considering the objective function value and its optimizing speed as the input parameters and applied it to the PV allocation problem including discrete decision variables. For multi-level discretization, this paper adopts a hybrid method combined with a simple rounding and sigmoid funtion based 3-step and 5-step quantization methods, and the application of the rule based expert system proposing the adequate discretization method at each PSO iteration so that the DPSO with the hybrid discretization can provide better performance than the previous DPSO.
송화창(Hwachang Song),조성구(Sung-Koo Cho) 대한전기학회 2010 전기학회논문지 Vol.59 No.5
This paper presents a method of finding the optimal operating point minimizing a given objective function with 3 phase power flow equations and operational constraints, called 3 phase optimal power flow (3POPF). 3 phase optimal power flow can provide operation and control strategies for the distribution systems with distributed generation assets, which might be frequently in unbalanced conditions assuming that high penetration rate of renewable energy sources in the systems. As the solution technique for 3POPF, this paper adopts a simulation-based method of particle swarm optimization (PSO). In the PSO based 3POPF, a utility function needs to be defined for evaluation of the degree in operational improvement of each particle's current position. To evaluate the utility function, in this paper, NR-based 3 phase power flow algorithm was developed which can deal with looped distributed generation systems. In this paper, illustrative examples with a 5-bus and a modified IEEE 37-bus test systems are given.
부산항의 선박으로부터 배출되는 질소산화물의 배출량 산정에 관한 연구
송화창(H.C.Song),이진욱(J.U.Lee),최재성(J.S.Choi) 한국마린엔지니어링학회 2003 한국마린엔지니어링학회 학술대회 논문집 Vol.2003 No.-
Recently controlling of air pollutants emission from onboard ship as well as on land has become more important issue. In order to prevent the port city from air pollution, we have to know how many tons of NOx emit from ships in all port city and we should make our own implementation schedule depending on our country's status.<br/> For this study, the estimation was tried about the discharge amounts of nitrogen oxides(NOx) from all ships in the port. But it is difficult to survey for the discharge amounts of NOx from all ships in a porty city due to time and cost. So this report proposed the method of calculation without onboard survey. W jth the comparison and analysis of other countries emission calculation method, author proposed basic data of total discharge NOx emission from ships in the port and simple calculation method. Especially, this report focused on port of Busan, because marine traffic of Busan is very intensified.<br/>
Power System Equilibrium Optimization (EOPT) with a Nonlinear Interior Point Method
송화창(Hwachang Song),호세로델도사노(Jose Rodel Dosano) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
This paper presents a new methodology to calculate an optimal solution of equilibrium to power system differential algebraic equations. It employs a nonlinear interior point method for solving the optimization formulation, which includes dynamic equations representing two-axis synchronous generator models with AVR and speed governing control, algebraic equations, and steady-state nonlinear loads. Equilibrium optimization (EOPT) is useful for diverse purposes in power system analysis and control with consideration of the system frequency constraint.
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.