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❑ Context: DC railway vehicles are subjected to surge transients specific to the traction system environment. ❑ Transient Event Specifications: • Standards. • Transit authorities may specify their own requirements. • Each project requires custom design. ❑ Vehicle Manufacturers Main Task: • Demonstrate during the qualification testing phase the performance of both the equipment and the overall system...
In this paper, the analysis and simulation of a single-core asymmetrical phase shifting transformer (PST) is presented. PSTs are usually used for varying the voltage phase angle between the two systems, which provides controlling active power flow through transmission (tie) line. The essential part of this work was related to developing an appropriate simulation model of the single-core phase shifting...
The development of the single-core symmetrical phase shifting transformer (PST) model and testing results of its selected differential protection is described in this paper. Generally, a PST is used for controlling the active power between the two systems being connected with one or more parallel transmission lines (paths). Most types of PSTs allow for changing of phase shift in a certain pre-defined...
Aiming at the problem of control inflexible and the control algorithm cannot take into account the quick adjustment and accurate control of hardware closed-loop feedback, PID or fuzzy control algorithm in battery testing system, we put forward fuzzy self-tuning PID control algorithm to control charging voltage of lithium ion battery, solving the problem of nonlinear time-varying charging system semaphore...
Single Current Regulator (SCR) is proven able to achieve deep flux-weakening operation of Permanent Magnet Synchronous Machines (PMSMs). A novel method is proposed to assure the smooth transition between Maximum Torque per Ampere (MTPA) and SCR control. This paper focuses on the development of a Hardware-in-the-Loop (HIL) Permanent Magnet Synchronous Machine drive testing system, and through this...
This paper presents an application of single-phase ac-ac converter with ac output current controls according to requirements of circuit-breaker (CB) testing standard (IEC 60898). Traditionally, the current sources for CB tests are simply designed to use the motor driven tap changing of auto-transformer for ac output current regulation. However, this kind of current source cannot provide the step change...
This paper presents a loopback methodology for static linearity testing of an ADC/DAC pair; the key idea is to raise the effective ADC and DAC resolution by scaling the DAC output. First, during ADC testing, we scale down the DAC output to achieve the needed test stimulus resolution and adjust the DAC output offset to cover the ADC full-scale range. Then, for DAC testing, we raise the effective ADC...
The implementation of complex functionality in low-power nano-CMOS technologies leads to enhance susceptibility to parametric disturbances (environmental, and operation-dependent). The purpose of this paper is to present recent improvements on a methodology to exploit power-supply voltage and temperature variations in order to produce fault-tolerant structural solutions. First, the proposed methodology...
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