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The correct analysis of power system transient stability is of great significance to the safe and stable operation of power system and the construction of smart grid. Based on the basic theory of Extreme Learning Machine (ELM), this paper studies the transient stability of power system. Firstly, the simulation model is built to simulate power system for obtaining data sets. Then, the implementation...
In this paper, an economic power dispatch problem is considered for smart grids. Firstly, the power dispatch problem is described by a constrained optimization problem, which is solved by Lagrange multiplier and Karush-Kuhn-Tucker condition. The incremental costs of generators are shown to reach consensus when the optimization problem is solved. Secondly, a new dynamic dispatch strategy is proposed...
Integration of wind power generation is increasing rapidly worldwide, hence bringing more challenges to the safe operation of the power system. In this paper, the basic construction method of dynamic security region (DSR) boundary is introduced. A model is established based on DSR, whose object is the minimization of controlling cost in dispatching operations. The coordinated control strategy based...
With the economic growth and the renewable energy integration increase, the weakly damped low frequency oscillation has become a major threat to the system stability in China's interconnected power systems. In this paper, some practical work on the applications of synchro-phasor measurement techniques in the field of wide area damping control are presented. The design, implementation and commission...
The increasing penetration of distributed generation (DGs) in distribution network promotes the development of microgrid. As important DG unit in isolated medium-voltage (MV) microgrid, the operating characteristics of the double fed induction generator (DFIG) have a crucial effect on microgrid stability. This paper analyzes the operating characteristics of DFIG in microgrid. Considering the constraint...
This paper presents a current-mode neural/muscular stimulator with an exponentially decaying stimulation current. The use of exponentially decaying current makes the voltage on the stimulating electrode constant during the stimulation, which eliminates the headroom and increases the power efficiency. A simple exponentially decaying current generator is proposed based on Taylor series approximation...
This paper proposes a method for calculating and analyzing section thermal limits under the condition of the security “N-1” criterion and forms the security region in multi-dimensional space. By calculating each generator's power transfer distribution factor (PTDF) on section lines, using the DC load flow model, the sensitive generators to the section thermal limits can be identified. With sensitive...
This paper proposed a new approach combining priority list (PL) with binary particle swarm optimization (BPSO) to solve unit commitment (UC) problem. At first, PL method was used to determine the initial UC, and then the optimization window was determined according to the results, at last the BPSO method was adopted to solve the UC problem within the window. The window is to reduce the computing time...
In this paper, a new approach for unit maintenance scheduling was proposed based on the credibility theory. This approach accommodates two-fold uncertainty: randomness of generator's failure and fuzziness of hydro energy simultaneously. To solve the scheduling problem effectively, a Benders decomposition approach was employed to decompose the optimization model into maintenance master problem and...
This paper presents a conceptual architecture for Micro Grid. The approach utilizes the strategy of control and coordination from Role Autonomous Decentralized System (RoADS) for autonomous operation of a Micro Grid. This architecture aims to optimize the generation production of local distributed generators. Case studies have been performed on a typical low voltage feeder with several distributed...
This paper presents a discussion on architecture-oriented assurance technology in Micro grid. We analyzed the characteristic of Micro grid from evolutional view, and proposed the concept of architecture-oriented assurance technology in Micro grid from the technology evolution and policy evolution. Technology evolution contained Function Evolution, Role Changing Autonomy and Role Coordination. Policy...
Streaming is a highly effective paradigm for expressing parallelism in high-throughput applications. A streaming computation is a network of compute nodes connected by unidirectional FIFO channels. When these computations are mapped onto real parallel platforms, however, some computations, especially ones in which some nodes act as filters, can deadlock the system due to finite buffering on channels...
Appropriate modeling of dynamic loads is of primary importance in voltage stability studies, especially increasing use of induction machines in both consumption and generation. This paper is mainly related to short-term voltage instability depending on time domain simulation. The actuality of voltage instability research is summarized, and the mechanisms of short- term voltage stability are explained...
A classical wind energy conversion system is usually a passive generator. Its power does not depend on the grid requirement, but entirely on the fluctuant wind condition. In this paper a DC-coupled wind/hydrogen/super-capacitor hybrid power system is studied. The purpose of the control system is to coordinate these different sources, especially their power exchange, in order to make the generated...
Fuzzy PD controls strategy capturing maximum wind energy is presented according to the variable of wind. Fuzzy has been widely used because of its nonlinear and stability. However, when it comes to the stable region under capturing maximum wind energy, it becomes fluctuation and brings dangerous to grid. Improving stability and capturing maximum wind energy are the keys of research. Simulation results...
With increasingly proportion of distributed generation (DG) in the power system, traditional power system planning has new challenges and demands. The necessity for flexible electric system, changing regulatory, energy savings and environmental impact are providing impetus to the development of DG. Itpsilas critical that the power system impacts be assessed accurately so that DG can be applied in...
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