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전력보상설비의 상호 협조제어에 따른 운영여유용량의 확보
이상덕(Sang-Deok Lee),백영식(Young-Sik Baek) 대한전기학회 2010 전기학회논문지 Vol.59 No.6
It is an important issue to electric power system operations that it can reliably supply large-capacity power to consumption area as due to increasing power demand growth. For this purpose, The FACTS equipment based on Power IT technology with the existing mechanical compensators has been applied to power system. Therefore we suggest on this paper that a plan for coordination control of multiple power compensation equipment in order to increase the utilization of each facility and secure operation margin capacity. As the result of simulation, it is possible to cope actively with a suddenly changed power system. This helps greatly for the voltage stability and supply reliability in a suddenly changed power system.
재귀최소자승법 기반 상태 및 외란 관측기 설계에 관한 실험 연구
이상덕(Sang-Deok Lee),정슬(Seul Jung) 제어로봇시스템학회 2018 제어·로봇·시스템학회 논문지 Vol.24 No.5
The performance of observers depends on the accuracy with which the system is modeled, and this eventually affects the control performance of dynamical systems. This paper presents an enhancement for observers by modeling the system more accurately with a recursive least squares (RLS) method in the second-order system for a control moment gyroscopic (CMG) actuator. The RLS-identified parameters can be used for both state and disturbance observers. First, an RLS method is reviewed to identify a second-order dynamical system as a proper rational transfer function. Second, a state observer (SOB) can be driven by transforming the rational transfer function into a state space representation. The observer gains consist of the model parameters. Third, an RLS-based disturbance observer (DOB) method is presented. Fourth, the two observers can be implemented and their performances can be verified through experiments.
이상덕(Lee Sang Duk) 계명대학교 사회과학연구소 2006 한국사회과학연구 Vol.25 No.1
Economic restructuring is an area where the collision protective labor law and new forms of work organization is especially severe. In the United States, many employers no longer value long employment commitment, but rather seek the ability to deploy labor flexibly and to outsource production. this is of course a response to the exposure of many industries to the heightened international competition flowing from financial and trade liberalization. It also reflects the renewed focus in many corporations on maximizing shareholder return, as opposed to the interests of other shareholder such as employees. In such an environment, restraints on termination and outsourcing are likely to be particularly unwelcome. However, how a national labor law system adapts to reduced employer commitment to workers partly depends on the system's underlying regulatory philosophy. The United States has historically had little in the way of restrictions on finn restructuring, outside the collectively organized sector of the economy, it is unsurprising that it has imposed few obstacles to firm reorganization. In other parts of the world, protective labor law has offered more robust resistance to employer"s desire to reduce obligations to their employees. Protection of job security and related entitlements are much more extensive. Western Europe is a prominent example. Again, this is consistent with longstanding underlying regulatory tendencies(in continental Europe at least) favoring collectivist arrangements and condiderable state regulation of the employment relationship. In the Asia-Pacific, there has been great regional diversity in approches to labor law. Many countries have experienced fundamental changes in regulatory institutions and norms in recent decades. No common approaches to restructuring should therefore be expected. If such economic restructuring is inevitable, is there any possible ways that could harmonized between free market principle and the protection of workers' right? Moreover more collisions are expected in the course of globalization of labor.