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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...
Accelerated degradation testing (ADT) Bayesian optimization design can determine prior distribution of model parameters by prior information, which avoiding the uncertainty to the result of design brought by assuming parameter selection arbitrarily. However, different people may have different tendencies when choosing prior distributions through the same prior information. It may result in different...
Atmospheric icing is one of the main threats to overhead transmission lines in cold regions. The ice related loads may cause mechanical incidents, such as wire breakage, cable rupture, clamp slipping, cross-arm deformation and even tower collapse. Ice shedding may lead to dramatic vibration of lines and cause flashover or short circuit among ground wires, conductors and the earth. Therefore, to obtain...
Due to the execution paradigm may be different at different invocation time, users obtain different QoS when interacting with the same Data Supply Chain (DSC). However, existing QoS prediction methods seldom took this observation into consideration, which shall decrease the prediction accuracy. In this paper, we propose a context-based QoS prediction method for data supply chain. First, a QoS mathematical...
Flux observer is a common and practical way to estimate the rotor position and speed for sensorless control of the permanent magnet (PM) AC motors. Currents in the damper cage influent the accuracy of the observed rotor position and speed severely. However, it is really difficult to measure the currents in the damper cage. According to the generation principle of the currents in the damper cage, the...
Channel mismatch has become a serious limit to further improve the anti-jamming performance on satellite navigation antenna arrays receivers. Consistency degree of each channel could directly determine the anti-jamming performance. In order to analyze and confirm the channel consistency indexes, this paper analyzes the impact of channel mismatch on interference cancellation ratio (ICR), firstly. According...
In order to meet the demand of fast electromagnetic transient simulation for large-scale interconnected power systems, a new method of GPU based parallel matrix exponential algorithm for power system electromagnetic transient simulation is presented in this paper. Firstly, the hardware structure and programming model of GPU are introduced. Then the high data parallelism based on matrix exponential...
Opportunistic Network has become an international hotspot in according with the popularity of various mobile intelligent terminals. But the nodes with limited communication capabilities cannot satisfy the growing of large content data transmission. Aim to these issues, we propose a novel communication capacity calculation model of Opportunistic Network based on the classical Random Direction mobile...
Although in recent years, the electromagnetic repulsion mechanism based on the eddy current repulsive force quickly become a hotspot, the mechanism can't apply to circuit breaker of long clearance between open contacts and high voltage. So it's vital to find a new one used for circuit breaker of long clearance between open contacts. In this dissertation, a new fast repulsion mechanism of double-coil-structure...
This paper presents a hybrid CMOS/magnetic nonvolatile flip-flop (NVFF) for standby-power-critical and quick-startup applications. Different from conventional magnetic NVFFs, which are based on the two-terminal magnetic tunnel junction (MTJ), the proposed NVFF employs the complementary-polarizer magnetic tunnel junction (CPMTJ) to introduce the non-volatility. The writing and sensing circuits of CPMTJ...
Hybrid AC/DC microgrid can make full use of different kinds of renewable energy to meet the needs of various types of loads. The bidirectional converters become the link between dc and ac region. In this paper, H8 robust control method is proposed to stabilize the both-side voltages of the bidirectional converters where it is transformed to a mix sensitivity problem. When there are perturbations on...
The explosion in the number of connected cellular devices and ever-increasing data bandwidth requirements have recently fueled the demand for RF Power Amplifiers (PAs) which needs PAs to cover more bands than ever before. A potential solution to this problem is by the use of Tunable Matching Networks (TMN). In this paper, we present a TMN fabricated under 0.18-μm SOI CMOS technology, focusing mainly...
In an autonomous microgrid without connection to the interconnected grid to support the frequency and voltage, it is more complex to control and manage. Thus in order to investigate the dynamic stability of the medium-voltage (MV) microgrid in Dongao Island, a detailed small-signal state-space model of the autonomous MV mixed-source microgrid containing diesel generator set (DGS), grid-supporting...
In this paper, we propose a novel feature descriptor for person re-identification without personal information. It is called Water-Drop Render Box (WDRB). The WDRB method is calculated by three steps with target color and its histogram: registration of target color, transformation of distance map, and enhancement of color using target histogram. In order to calculate WDRB, person's top-view images...
In this paper, we address the positioning problem of remote centre of motion (RCM) mechanisms with uncalibrated image feedback from a monocular camera. Nowadays, RCM mechanisms are widely used in minimally invasive robotic surgery due to their ability to distally rotate a tool around a fixed entry port; note that in most surgical applications, the tools are typically controlled by manual/teleoperated...
Large-scale wind farm integration poses challenges to the modeling and simulation of power system electromagnetic transients. In this paper, state space modeling of typical induction generator wind farms is demonstrated using a subsystem assembly process, and a novel matrix exponential based simulation algorithm is applied, which is efficient, stable, and especially suitable for high dimensional nonlinear...
Guaranteed-Service Approach (GSA) was used to set safety stocks for multi-echelon inventory systems. This approach assumes that each stock can use operating flexibility measures such as expediting and overtime to fulfill excessive customer demand superior to a bound as a supplement to its safety stock. In this paper, we consider a two-level distribution inventory system with Poisson final demand and...
The ever-increasing scale of system interconnection and diverse dynamic time constants of power equipment pose challenges to power system transient simulation algorithms. In this paper, an adaptive numerical integration method for DAE systems based on matrix exponential operator is presented. Krylov subspace technique is utilized to effectively reduce the problem dimension. A novel step adaption scheme...
The dynamic characteristics of active distribution networks (ADNs) need to be concerned if a large number of distributed generators are connected. A highly efficient and reliable simulation algorithm with good numerical stability is therefore essential for the stability analysis of ADNs. This paper proposes a novel dynamic simulation algorithm of ADNs based on the implicit projective method, which...
Application of energy storage system (ESS) has been a chance and challenge to distribution system operation and integration of renewable energy sources (RESs). A conic programming (CP) based method is proposed for the optimization of distribution system with ESS in this paper. Firstly, the operation optimization model considering the state of charge (SOC) of ESS is built to minimize the active power...
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