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With the great development of renewable energy, the integration of large-scale wind power has been the focus of many recent studies. As the randomness and uncertainty, it is of great challenge to make suitable power generation plans to ensure the safety and stability of current grid. The objective of the presented paper is to propose a new approach to smooth the output of wind power. We flat the fluctuation...
This paper proposes an approximate inference and parameter estimation in factorial hidden Markov models (FHMMs), a generalization of hidden Markov models (HMMs) in which the state is factored into multiple Markov chains. Earlier research has proved exact inference and parameter estimation can be computationally intractable. The proposed method in this paper considers FHMMs to be an alternative generalization...
The two dimensional (2D) electric field mathematical model of arc-quenching chamber employing shunted capacitors in a 550kV dual-break extra high voltage SF6 circuit breakers (EHV SF6 CB) has been established and the influences of shunted capacitors are discussed based on finite element method (FEM). A novel structure of capacitor banks has been suggested to improve the electrical field distribution...
In this paper, the simulation and optimization electric field distribution in 550kV disconnectors of Gas Insulated Switchgear (GIS) are investigated employing the Finite Element Method (FEM) and Response Surface Method (RSM). The simulation results reveal that a uniform electric field distribution is achieved in 550kV disconnectors of GIS. This optimal prototype of disconnectors has been undertaken...
A novel topology analysis method is presented to analyze the testability of grounding grids, and creditability is firstly proposed as an important index to evaluate the results. In this method, inaccessible nodes are eliminated by wye-delta transformation, followed by the calculation of testability and creditability index in the reverse direction. Simulation results are provided to prove this method.
The method of corrosion diagnosis for substation grounding grids based on large change sensitivity is proposed. By analyzing the node voltages, the large change sensitivity of the port voltages in response to the branch resistances is given and the nonlinear optimal model of corrosion diagnosis is established. The diagnosis equations based on the differential sensitivity were set up in traditional...
A fuzzy adaptive particle swarm optimization (FAPSO) for optimal operation of cascaded hydropower station is presented to solve the shortcoming premature and easily local optimum of the standard particle swarm optimization (PSO). The fuzzy adaptive criterion is applied for inertia weight based on the evolution speed factor and square deviation of fitness for the swarm, in each iteration process, the...
A hybrid genetic algorithm (HGA) is presented to solve the thermal unit commitment (UC). It effectively uses the binary-coded genetic algorithm incorporating a priority list ordering scheme to solve the unit commitment up/down problem and the lambda-iteration method to solve the power economic dispatch problem, This modification helps to explore the search space very effectively, It generates better...
This paper presents an iterative congestion management method considering voltage stability under multi-contingency for day-ahead electricity markets. Load margins constraints under multi-contingency as well as normal conditions are incorporated into VSC-OPF (voltage stability constrained OPF). Based on sensitivity of the loading margin with respect to active power of generators and loads, an allocation...
For some operating conditions, secure operation of power systems is ensured by preventive controls. But for some other operating conditions, secure operation of power systems is ensured by corrective controls. Preventive and corrective controls have totally different technologic and economic implications. The N-1 contingency and N-2 contingency scenario should be dealt with different controls measures...
In this paper, a modified fast multipole integral (FMI) method is proposed for the calculation of the frequency dependent inductance of on-chip interconnects. The method is based on the discretization of the integral formulations and the fast multipole method by which the magnetic vector potentials induced by the currents through the conductors were calculated at the cost of O (N), where N is the...
Based on exact penalty function, a new neural network for solving the L1-norm optimization problem is proposed. In comparison with Kennedy and Chua’s network(1988), it has better properties.Based on Bandler’s fault location method(1982), a new nonlinearly constrained L1-norm problem is developed. It can be solved with less computing time through only one optimization processing. The proposed neural...
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