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Cross-regional interconnection of power systems, large-scale integration of renewable energy and interaction between demand side and power systems are raising new challenges to the operation of a large scale power system, such as complexity, uncertainty. A risk quantitative assessment method of emergency control measures is proposed to improve power grid transmission capacity based on the study of...
A 10/30 MHz voltage-mode controlled buck converter with a wide duty-cycle range is presented. A high-accuracy delay-compensated ramp generator using only low-speed comparators but can work up to 70 MHz is proposed. By using a differential difference amplifier (DDA), a new Type-III compensator is proposed to reduce the chip area of the compensator by 60%. Moreover, based on the unique structure of...
This paper proposes to evaluate reliability performances at operating stage for power systems with variable wind generation. This is a first step towards recognizing the stronger coupling of power system decision making across different time-scales. In the day-ahead energy-reserve co-optimization unit commitment model, the validity of using operating reserve as an approximation of long-term reliability...
Power system low frequency oscillations are detrimental to the stability and security of interconnected power networks. The recent advance in the wide area measurement system (WAMS) is driving power community to accept the notion of wide area monitoring and control. This paper proposes the placement of wide area PSSs and the selection of stabilizing signals based on improved residue matrices. Modal...
This paper presents a new approach via multi-particle swarm optimization (MPSO) to solve the unit commitment (UC) problem. A new strategy which can generate feasible particles and make the search space narrow within the feasible solutions is presented. Some particle swarms are generated by the new strategy, and location optimum solutions are searched in each particle swarm, then a new particle swarm...
Static Var Compensator (SVC) is a kind of FACTS device which is used in power system primarily for the purpose of voltage and reactive power control. Based on wide area signals, this paper presents a systematic approach for designing SVC supplementary controller, which is used to improve the damping of power system oscillation. The principle for damping oscillation by SVC is first analyzed and the...
A load parameter identification method based on wide area information of power system is presented. Load parameters are identified by fitting the wide area dynamic characters, such as generator angle in this paper. Load parameters of wide area identification can not only simulate the local load dynamic characters but also reflect the wide area system dynamic characters, especially the character of...
This paper proposes a new method of controller design for damping inter-area oscillations in power system. The concepts of the mode controllability index and mode observability index are introduced into the modal analysis at the operating point in damping controller design. The controller is located according to mode controllability index, and the input signals of controller are selected according...
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