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Based on a linear mono centric city, with the explicit consideration of user heterogeneity, i.e., each commuter has a different value of time (VOT), this paper investigates the optimal Park and Ride (P&R) location along the subway in a mode choice equilibrium model. On the basis of the model, we further examine the impact of the Tradable Credit Scheme (TCS) on the mode choice equilibrium. Numerical...
Power quality disturbances carry a large amount of information reflecting the operating conditions of the system and equipment, providing a data source for load modeling. Avoiding high complexity of computation in sampling side and waste of hardware, the compressed sensing (CS) theory is applied to processing the power quality monitoring signal. On the basis of the disturbance data processed by compressed...
This paper presents a new definition of vulnerability area of voltage sags concentric relaxation vulnerability area (CRVA) that is the area of voltage sags caused by fault with the fault point as the center. Analyzing CRVA could greatly reduce the workload involved in traditional voltage sag vulnerability areas and provided us a judgment reference of the attribution of liabilities between power supply...
This paper presents a definition of "total harmonic contributions". In order to calculate the harmonic voltage instantaneous value at the point of common coupling (PCC) produced by harmonic source's harmonic current, a time domain equivalent model of distribution network is established. What's more, a computational method about total harmonic contributions determination is deduced in this...
This paper presents an approach applying Hybrid Particle Swarm Optimization algorithm to voltage sag frequency state estimation, based on the monitoring system determined by optimum allocation method of voltage sag monitoring nodes. Voltage sag frequency state estimation is interpreted as the estimation of the number of voltage sags occurring at non-monitored buses from the recorded voltage sags occurrence...
This paper presents a new problem formulation for allocation of superconducting fault current limiter (SFCL) for reducing fault current and mitigation of voltage sag. The analytic expressions for calculation of voltage sag with SFCL are derived. A new optimal model is established for allocating the installation location, impedance values and critical quench current of SFCL. The optimal objective function...
Ferroresonance due to transient impact is a common phenomenon in ungrounded distribution system. It is a great threat to the security of power system. Highly nonlinear magnetizing inductance of the potential transformer and zero sequence capacitance of the system may cause low, high or fundamental frequency resonance. On the basis of analyzing the mechanism of ferroresonance, an equivalent model of...
Critical start-time and end-time are important indices for power quality disturbances. But the sampling signals often have noisy component, the locations of start-time and end-time are hard to get. Wavelet is an effective tool for those non-stationary signal processing and has been used in this field. Local feature in the signal can be enlarged after the transformation using the scalar wavelet. But...
Pattern recognition and time location of power quality disturbances using TT-transform is proposed in this thesis. TT-transform is performed to the original signal and the result is a complex matrix. The absolute value of the complex matrix called modulus matrix. Unit cylinder is got by every row vector of modulus matrix as the mother curve and the cylinders are superposed. A 3D figure is got and...
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