Strong nonlinearity and high volatility are the main features of wind turbine systems. Under conditions random speed changes, how to quickly control output power within rated range is a major challenge for system control. This article proposed an iterative neuro-fuzzy Hammerstein model based predictive turbines. Initially, used characterize feature The nonlinear static component's aerodynamic property estimated using networks, linear dynamic component identified AutoRegressive with Exogenous...

High-performance aluminium matrix composite joints were fabricated using a new joining technology assisted by ultrasonic vibration. The performance of the was close to that parent materials. microstructure and mechanical found be systematically dependent on volume fraction distribution reinforcement particles in bond region. authors believe this study can generalised bonding other ceramic-reinforced metal composites.

The dissolution and precipitation behavior of a solid-Al/melted-Sn system was investigated. Total Al content in the Sn bump increased continuously with time reached 30 at%, far exceeding solubility limit (3.7 at%) molten Sn. reason for over-saturation analyzed discussed. A single-directional dynamic equilibrium process demonstrated that α-Al solid solution can precipitate from melted while substrate is dissolved by Ultrasonic action improve rate this effect. This work could facilitate...

VSC-HVDC is usually associated with the AC system, which will be inevitably affected by system.VSC-HVDC mostly operates in environment of strong current and high voltage, lead some parts internal device to interfered or damaged.This paper studies control technology system fault mode ensure that itself not only perfect but timely rescue when it necessary.

Owing to the scale of power distribution system’s continuously expanding, closing loop operation is usually needed meet demand for reliability supply. However, during course this operation, a larger AC surge current with 4~5 times normal value will be induced, and can cause equipped over-current protection take action incorrectly. In paper, hybrid type superconducting fault limiter (SFCL) suggested installing into system, which inhibit closing-loop transient by using current-limiting...

In order to solve the problem of high voltage system which caused by an excess reactive power during systems valleyload period,this paper described methods leading phase operation generator adjust reasonable range, is proved feasible and effective through field test.

In order to develop a high-strength aluminum alloy, alumina dispersion strengthened alloy was prepared by high energy ball milling on 2024 powder in ethanol. The microstructure, particle size and distribution of the Al2O3 particles were analyzed FE-SEM; mechanical properties investigated. Results showed that successfully milling, several tens nm diameter homogeneously distributed matrix grain spatial distance between about 50-100nm. yield strength elongation oxide 489MPa 7.9%.

When a single-phase high impedance grounding fault (HIGF) occurs in power grid with small resistance system (SRGS), the overcurrent protection does not work, which may expand range and evolve into more serious fault. In this paper, HIGF feeder selection method is proposed to solve problem. Firstly, zero-sequence equivalent model of SRGS established, features low that are compared. Then, characteristics zero sequence current (ZSC) analyzed, correlation between neutral (NRC) ZSC discussed....

Objective. To investigate the improvement of cognitive function and inflammatory response in perimenopausal patients with MCI by kidney-tonifying, blood-activating, mind-nourishing. Methods. 80 who met diagnostic criteria were divided into a therapy group (n = 40) control according to treatment method. The was given nimodipine (Bayer Pharmaceuticals) 30 mg, 3 times/day orally, while decoction self-prepared Ningshen prescription on top (glossy privet fruit, mulberry, aizoon stonecrop,...

The pitch adjustment is critical to maintain the stable operation of wind energy conversion system (WECS) under high speed, which can reduce mechanical load and provide safe reliable power input for grid. It makes design a controller arduous because WECS order with nonlinear, multi-variable, strong coupling. Based on this, novel presented by employing dynamic just-in-time learning (JITL) based model predictive control investigate turbine performance in speed operating region. This method...

To achieve further optimization of resource utilization, HVDC power transmission project in the proportion state grid is growing and range applications are more widely. Due to high cost converter stations, properly design DC MOA for system insulation coordination reducing crucial. Through research analysis large amounts data, test technologies in-depth expounded, It’s deepened staff’s understanding MOA, there also some guidance references repair maintenance MOA.

A control method is proposed to improve vehicle yaw stability by the integrated of moment control. The strategy using feedback compensator proposed, which produces direct and front steering angle rate, actively controlling angle, system makes performance actual model follow that an ideal model. experiment performed at different conditions, results showed presented can effectively same time lighten burden driver. Key words: EPS; Yaw rate feedback; Vehicle

DL compiler's primary function is to translate DNN programs written in high-level frameworks such as PyTorch and TensorFlow into portable executables. These executables can then be flexibly executed by the deployed host programs. However, existing compilers rely on a tracing mechanism, which involves feeding runtime input neural network program execution paths generate computational graph necessary for compilation. Unfortunately, this mechanism falls short when dealing with modern dynamic...

The power system is an important part of the energy internet, and its complexity has been a major challenge in modeling control. To address problem frequency stability for multi-area interconnected systems with unknown model, distributed load control (LFC) scheme based on adaptive data-driven algorithm proposed. Firstly, data model coupling information flow connection established by introducing dynamic linearization technology. Subsequently, controller gain developed directed graph, which...

Abstract Reactive power compensation is an important measure to improve the quality of distribution networks, especially with increasing connection transformers, heavy industrial electrical equipment, and asynchronous motors, which generate a large amount reactive demand. Traditional devices, such as fixed capacitors (FC) thyristor switched (TSC), have some drawbacks, low response speed, harmonic generation, switching shock. A static synchronous compensator (STATCOM) flexible AC transmission...

At present, seismic design method of buildings has made a great development. However, performance between infill walls and structural components was not much considered in China. By means many post-earthquake investigations, are easily widely damaged to different extent. In this paper, construction measures discussed collapse simulation infilled frame without is carried out by ANSYS/LS-DYNA software. The results show that it very important connect infills with setting steel tie bars. Then,...

The wind energy is characterized by randomness and volatility., which gives rise to certain power prediction (WPP) errors seriously endangers the security stability of system. Dynamic linear model based on storage system (ESS) compensating error for studied in this paper. Firstly, an outlier cleaning method change-point group quartile (CPGQ) algorithm proposed improve availability data, conducive follow-up information mining. Then, sake adapting complex mechanism strong nonlinearity...