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With the rapid development and application of distributed generation, more and more attention has been paid to the operation and control technology of the wind storage isolated network system. As a kind of new energy application, the operation of wind storage isolated network system has a great technical advantage in the process of operation. Aiming at the problem of self starting and stable operation...
The large-scale intermittent wind has been incorporated into current grid. in order to achieve transient angle stability quantitative analysis and evaluation, this paper proposes a fast assessment method of wind power generators and coal-fire power generators in transient angle stability control. Using the EEAC (extended equal area criterion) angle stability quantification theory, the defense vectors...
In the calculation of AC / DC power flow, how to consider the control mode of HVDC transmission system effectively is a problem that must be considered in power system planning and operation. In this paper, based on the principle of equivalent power and AC / DC system alternating decoupling solving, a power flow calculation program is presented. The main control modes of HVDC transmission system and...
In this paper, we present a new method to sketch the common among several images. Our method captures rotation invariance by extending the local self descriptor to rotation invariance and proposes a easy method to detect a roughly similar region across the images. Our method is composed of three stages: (i) Detecting a similar region which the proportion of the common is as large as possible across...
This paper investigates the performance of Baah et al.'s causal regression model for fault localization when an important precondition for causal inference, called positivity, is violated. Two kinds of positivity violations are considered: structural and random ones. We prove that random, but not structural nonpositivity may harm the performance of Baah et al.'s causal estimator. To address the problem...
In this paper, a novel micromachined vibratory gyroscope is proposed, where a two degree-of-freedom (2-DOF) architecture with two masses and three springs is utilized in both drive-mode and sense-mode. The 2-DOF dynamic structure provides the inherently robustness of both modes against structural and environmental variations. The proposed gyroscope demonstrates drive-mode 3-dB bandwidth of 190 Hz...
The relative position between magnetic target and the device installed on underwater vehicle, is determined by measuring magnetic field magnitude and gradients of target on condition that geomagnetic field anomaly can be viewed as a magnetic dipole target. The relationship between the errors of magnetic field magnitude, gradients and the variation of platform attitude and its effect on localization...
In the paper, the principle of speed governor of synchronous machine is discussed firstly. Based on this, mathematical models of the speed governors of BPA and PSS/E are compared to find the corresponding relationship of the speed governor models between BPA and PSS/E. The corresponding models have been validated by simulation of a single machine infinite bus system and the quantitative analysis of...
Zero Velocity Update (ZUPT) utilizes the zero velocity condition for stationary Strapdown Inertial Navigation System (SINS), executes navigation errors estimation and emendation to control SINS position growth. The improved filter estimation ZUPT is proposed in this paper. Two technologies, separate-bias Kalman filter and yaw error rapid estimation, are applied in the proposed method. Separate-bias...
A initial alignment algorithm in the inertial frame based on the alignment application of Kalman filter was presented. State and observation equations of strapdown inertial navigation system (SINS) are established using Kalman filter by the gravity vector projected in the inertial frame, and the initial alignment of the SINS based on the inertial frame on stationary base was compared with the alignment...
This paper proposes the fusion of GPS measurements and inertial sensor data from gyroscopes and accelerometers in tightly-coupled GPS/INS navigation systems. Usually, an extended Kalman filter (EKF) is applied for this task. However, as system dynamic model as well as the pseudorange and pseudorange rate measurement models are nonlinear, the EKF is sub-optimal choice from theoretical point of view,...
Taking FOG SINS (fiber-optic gyroscope strapdown inertial system) as an object, a new fault diagnostic scheme based on BP (back-propagation) neural network is proposed. Being capable of training and simulating data off-line, neural networks provide a solution to overcome some drawbacks of the quantitative fault diagnosis. The fault tree of FOG SINS is analyzed, which is the basis of the study of neural...
This paper presents a velocity matching scheme for rapid transfer alignment of INS. Velocity matching algorithm is known as one of the best matching algorithm of SINS in-motion alignment since it can achieve high alignment accuracy without lengthy time requirement. We try to find a more excellent filter than the traditional kalman filter in this paper. Firstly the mathematical model of velocity matching...
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