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The existing power system fault analysis method is based on the information of power system relay protection and sensor device to determine the location and type of fault. With the continuous expansion of the power system and the increasing complexity of the structure, excessive alarm information makes it difficult to diagnose the power system faults timely and effectively. A fault diagnosis method...
The traditional analytical method has low precision and narrow application range. The calculation process of the finite element method is complex. And the deflection calculation methods, which are widely used in current, do not take the vertical offset produced by the boom gap into account. This paper puts forward a calculation method of crane deflection considering boom gap. Firstly, the decomposition...
Aiming at the constant change of the crane actual load and the crane rating load, this paper proposes a method of load optimization for the cooperative lifting of double cranes considering the minimal lifting consumption. Firstly, the actual load distribution of each crane under typical lifting movements is calculated. Secondly, we build the relation model of the crane rating load and crane range,...
As the core control unit of ABS system, ECU plays an important role in evaluating the safety standards of the ABS system, it can be used to control the executive unit according to the state parameters of vehicle. Aimed at the high-cost, complex and long in the road test, an improved ABS ECU test system for the pneumatic ABS is proposed in this paper. Composed of finished ECU, data acquisition card,...
Load modeling has a significant impact on power systems dynamic simulation and control. In this paper, an alternating least squares approach is proposed to decompose the nonlinear optimization problem of dynamic load parameter identification to two linear least squares problems, which can be solved in an alternating manner. A DFT-based numerical derivative technique is also proposed to attenuate the...
This paper presents an application of a two-dimensional continuous/discrete model based repetitive control method in voltage control of DC/AC inverters. The control objective is to suppress harmonic distortion, ensure high quality sinusoidal voltage output. Total harmonic distortion(THD) is one of the main criteria to evaluate power quality, it should be kept as small as possible. Modeling of the...
This paper presents an unknown exotic disturbance rejection method and its application on speed control of a conveyor belt system. First, the general concept of the Equivalent-Input-Disturbance(EID) is introduced, Next, based on the description of the model of a practical mechanical device, the configuration of the servo system based on EID is given, Then the designing procedure is presented and simulation...
Grid impedance estimation is important in monitoring and protection of wide-area power systems. In this paper, a recursive least squares estimation algorithm with a forgetting factor is proposed to identify impedance matrix of electrical power grids. This new approach is based on synchronized phasor measurements and makes it possible to track changing parameters due to grid reconfiguration and load...
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