Applied Mechanics and Materials Vols. 672-674

Abstract: Compartz curve model is used to define China's wind power industry according to the statistics of the decade's new wind power capacity worldwide and China’ new wind power capacity. Studies shown that China’ new wind power industry is in the growth stage of the industry life cycle. With the industry's characteristics of this phase, given the policies of soft environment improvement, leading enterprises development, market mechanisms introduction, technology innovation system building,industry service system improvement and intellectual property protection system establishment to our goverment.

Abstract: Due to the high J_C of the superconductor, the volume and the weight of the generator can be significantly reduced if the superconducting coils are used. This paper has designed a 40-pole racetrack excitation winding for the 12MW offshore wind turbines generator. The excitation winding are wound by Nb-Ti superconductor, running at the temperature of 4.2K. In order to ensure the stability and reliability of the magnetic field, some optimizers for the design of the excitation winding are adopted. As a result, the fundamental magnetic field at the air-gap center of the armature winding could reach 2.1T, thereby the 12MW power generation could be achieved.

Abstract: With the rapid development of wind power technology and industry, the structural loads become a limiting factor for safe wind turbine operation and wind turbine operation life. In this paper we present a design of dynamic torsional load control and the design are based on fuzzy control. Simulations are presented to demonstrate the efficiency of our design.

Abstract: With the fast development of the wind power, security constraints of power systems have become the bottleneck of the acceptable capacity for wind power. The underdamping oscillation modes of the inter-area is an important aspect of the constraints. In this paper, an equivalent model of a power system with wind plants has been established, and the impact of the integration of the large-scale wind power on the inter-area oscillation modes has been studied based on the frequency-domain and time-domain simulations. The results indicate that the damping of inter-area oscillation mode can be enhanced by the replacement of synchronous generators (SGs) with the wind generators. The enhancing degree is up to the participation value of the SGs replaced. The conclusion has been verified by the actual system example of Xinjiang-Northwest grid. It can provide a reference for system programming and operation.

Abstract: The combined operation of large-scale off-grid wind turbines and energy-intensive seawater desalination devices will be one of the directions of the cleaner freshwater producing technology in the future. This paper discussed the operation modes and control strategies of isolated micro-grid with wind power, energy storage and seawater desalination equipments based on load characteristics of seawater desalination devices and operating characteristics of wind power, put forward energy management and coordinated control strategies to enhance the economical efficiency and stability of the system. Finally, a digital-analog simulation platform was build based on PXI+cRIO. The real-time simulations for various operating modes of this isolated micro-grid system verified the feasibility of the proposed strategies.

Abstract: The construction of large capacity Kemskaya wind power plant (WPP) at the coast of the White Sea was considered to decrease the deficiency of energy in the region. The results of wind energy resources research of the region are presented. The results of calculation of Kemskaya wind power plant parameters including net electricity production, hours of plant’s installed capacity utilization, and capacity factor are given. Three variants of Kemskaya WPP construction are considered: with capacity 30, 180 and 1000 MW.

Abstract: Wind power planning towards large-scale accommodation of wind power while satisfying technical and economical constraints, it should consider power system adaptability and economy when giving full play to the wind benefits. This paper considers the relationship among wind power accommodation, construction of transmission lines and conventional unit operation costs and proposes an economic and reasonable wind power planning approach aiming at accommodating wind power efficiently and effectively. Combined the constrains of peak load regulation and network construction together, optimal wind power planning model is established, and based on the system operation simulation, a series of wind power planning evaluation index are obtained, which can estimate the wind power planning scheme from multiple angles. Finally, the feasibility and reasonability of the proposed planning approach has been verified by a numerical test system.

Abstract: By the disadvantage of the speed fluctuations to the gear noise and vibration spectrum in time domain, a new method to measuring the periodic signal was put forward in pulse time domain. The multi-channel simultaneous measurement model were brought out, aimed at analyzing the gear meshing state and its frequency characteristics. Then, the 14 DOF nonlinear vibration equations was derived from kinetic analysis on the planetary gear pair meshing model, which was solved and simulated in Matlab software, containing with transmission error, time-varying mesh stiffness, clearance and other factors. Finally, an integrated platform was constructed for measuring gear noise, vibration and transmission error to verify the effectiveness and feasibility of the analytical.

Abstract: As an increasing proportion of wind power in power grid, reactive power problem has become the most important problems in wind power integration. But as a result of wind power is a kind of intermittent energy sources, and put it into use in a large scale only just beginning. Many urgent problems which affect on system stability need to be resolved, such as voltage stability, reactive power compensation. This paper discussed the problems which around the reactive power compensation and angle stability issues while wind power integration. The reactive power compensation device named STATCOM instead of traditional capacitance. Establish the mathematical model of the Doubly-Fed Induction Generator (DFIG) and Static Synchronous Compensator (STATCOM) [3]. In order to meet the wind farm can transport reactive power quickly and continuously after fault. Establish the control strategy of DFIG combined with STATCOM [1]. Using the software MATLAB to simulate the wind power grid model and control system, verifies the rightness and effectiveness of model and STATCOM reactive power compensation effect for wind power integration.

Abstract: The necessity for grid codes of the dispersed wind power connected to power grid is described briefly and the definition of the dispersed wind power is discussed compared with the distributed wind power in China. Aimed at the dispersed wind power, the main technology indicators of wind power grid codes between Denmark (below 100kV), Germany (below 60kV) and China in aspects of access principle, connection mode, active power / frequency control, reactive power / voltage control, fault ride through and power quality are compared to provide reference for the modification and completion of the dispersed wind power grid code in China.