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This paper proposes an analysis method of power grids vulnerability based on complex networks. The method effectively combines the degree and betweenness of nodes or lines into a new index. Through combination of the two indexes, the new index can help to analyze the vulnerability of power grids. Attacking the line of the new index can obtain a smaller size of the largest cluster and global efficiency...
Computer game, a new field of artificial intelligence, as the name suggests, is to make the computer learn to think and play chess games like human beings. As one of the important research field of the artificial intelligence, computer game, which is considered as the touchstone of the artificial intelligence, has brought many important methods and theories to the field. Connect6, is a newly introduced...
A hybrid isolated microgrid is proposed, including PV power, diesel generator system, load and other subsystems.. Based the equivalent circuit and output characteristics of photovoltaic cells, PV model has been established and maximum power point tracking(MPPT) has been implemented to make full use of solar energy. Diesel model has been established, base on it PID load frequency compensation control...
In this paper, a novel improved multiobjective particle swarm optimization (IMOPSO) is proposed for solving the optimal reactive power dispatch (ORPD) problem with multiple and competing objectives. In order to improve the global search capability and the nondominated solutions diversity, time variant parameters, mutation operator, and dynamic crowding distance are incorporated into the MOPSO algorithm...
Island operation of a fraction of power distribution network with distributed generators (DGs) is considered an efficient operational paradigm to enhance the security of power supply. This paper attempts to address the issue of island partitioning in distribution network with the penetration of small-scale DGs and present a two-stage algorithmic solution. In the suggested solution, the CSP-based method...
The safe and stable operation of the large capacity thermal power unit must be seriously affected by the rapidly changed load when the unit participates in peak regulation. This paper takes a domestic 600MW steam turbine unit as an example, sets up a mass-spring model with lumped parameter method and calculates the torsional vibration responses of the shafts with the method combined Riccati transfer...
In this paper, a micro grid price mechanism is discussed and optimised. Operators can increase the consumers's profile under step-price environment. With a novel low-carbon strategy designed in this paper, consumers make ones own decision whether to buy or sell energy with what price. By using this strategy, energy distribution can be optimised and the utilization of clean power will increase. A simulation...
The direct-drive wind turbine has become a focus recently for wind power generation because it has many advantages, such as simple construction, high reliability and so on. In this paper, a permanent magnet wind power generation system based on coordination control of double PWM is presented. And one dynamic model of permanent magnet synchronous generator (PMSG) is established on the basis of taking...
The main contribution of this paper is the development of hybrid model predictive control and fault detection strategy for wind energy conversion system (WECS) based on mixed logic dynamic (MLD) model framework. The MLD model for WECS including multiple work regions is established. Also the hybrid model predictive control method based on the MLD model of WECS is adopted to implement the variable speed...
The PV power plant at home and abroad are basically the unity power factor operation and maximum output of active power. It ignores the reactive power output capability, not for active and reactive power in a separate regulation. Based on the study of the reactive power control strategy for single-phase gird-connected inverter, a single phase voltage type gird-connected inverter mathematical model...
Cogeneration system isnonlinear, wide range of operating regime, and multivariate. The generating efficiency and thermoelectric conversion coefficient of turbine generator are affected by many factors such as load variation, extracted steam change, and unstable supplied power etc. In this paper, a statistical model identification algorithm has been proposed to build the model of generating efficiency...
It is worse that steam generator is controlled by PID which is non-minimum system with oscillation. ADRC achieves excellent control performance using nonlinear control law, but it isn't necessarily optimal when adopting standard ADRC structure and NLSEF. In this paper, we optimize the standard ADRC, the simplified ADRC without TD, the improved ADRC with NLSEF using mtfal and zzxfal based on GA. The...
This paper mainly studies one dimensional mean-field backward stochastic differential equations (MFBSDEs) when their coefficient g is uniformly continuous in (y′, y, z), independent of z′ and non-decreasing in y′. The existence of the solution of this kind MFBSDEs has been well studied. The uniqueness of the solution of MFBSDE is proved when g is also independent of y. Moreover, MFBSDE with coefficient...
Simulation model of micro-grid including a direct-drive wind power generation, two sets of power-controlled distributed generations (DGs) and a three-phase fault module was investigated in Matlab/simulink. Based on the constructed model, the operating process switched from island mode to grid-connected mode was simulated and the voltage variance signal was detected with Daubechies(Db) wavelet. The...
Distributed energy resources and energy-storage units are parallel connected through converters in a DC bus microgrid. Current sharing is a basic requirement for microgrid and many current sharing methods are proposed. Distinct from those methods like the average current method, centralized method and master-slave method, the droop control method does not need any interconnections between the converters...
This paper introduces the present development and situation of computer games, especially in connect6. Through the regulations of computer games in connect6, it is described that main technologies and principles are existing in the connnect6 game. According to the algorithm and application of other mature computer games, the five steps of connect6 method and skill is improved to be advanced and modified...
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