In this paper, we review some of the main methods to characterize on-state and off-state losses in wide-band-gap devices under switching conditions. In the off-state, we will discuss about losses related to charging and discharging the output capacitance in wide-band-gap devices, both in hard- and soft-switching. In the on-state, we will present an accurate …
In order to enhance the dynamic reactive power support capacity of new energy grids and the ability of new energy to connect to the grid, increase the stability level of the transient voltage of the grid and reduce the risk of DC commutation failure. Therefore, a certain number of dynamic reactive power compensation devices are deployed in key stations …
The permanent magnet synchronous motor (PMSM) has become one of the most popular choices in industry applications due to its superiority in efficiency, noise, and vibration [1,2,3,4,5,6,7] gure 1 shows a typical PMSM drive system based on power metal-oxide-semiconductor field-effect transistor (MOSFET), in which S A H, S A L, S B …
The health management of railway signal equipment in the high-speed railway is a key link between intelligent operation and maintenance. Accurately predicting the health state of compensation capacitors is of great significance to ensure the reliable work of track circuits. ...
Optimization of the Relay Coil Compensation Capacitor for ...
2017 International Conference on System Science and Engineering (ICSSE) Design of Dynamic -Static Var Compensation based on Microcontroller for Improving Power Factor Dang Van Huyen*, Phan Thanh ...
Introduction This paper uses a dynamic voltage restorer (DVR) to improve the voltage quality from voltage sags. It is difficult to satisfy various of compensation quality and time of the voltage sag by using single compensation method. Furthermore, high-power consumption of the phase jump compensation increases the size and cost of a …
1. Voltage Rating In picking capacitors for a compensation controller, voltage rating is key. It must surpass the maximum system voltage, including transients, to avert dielectric breakdown. For instance, in a 400V system, a capacitor with a minimum rating of 450V ...
The giant magnetostrictive rotary ultrasonic processing system (GMUPS) with a loosely-coupled contactless power transfer (LCCPT) has emerged as a high-performance technique for the processing of hard and brittle materials, owing to its high power density. A capacitive compensation is required to achieve the highest energy …
The compensation cost can be reduced by introducing static compensation with dynamic compensation on compromising with voltage response within permissible range. Hence, optimization technique is introduced in this chapter that provides economic solution of reactive power compensation for an isolated hybrid electric system.
Dynamic capacitor (D-CAP) is able to provide dynamic reactive power and harmonic compensation for industrial plants. Previous papers have introduced the principles and control strategies of D-CAP. However, there is no paper to focus on resonance conditions of D-CAP. In this paper, based on three-phase Buck-type D-CAP, basic structure and …
Power system operation involves many switching functions that may inject currents with different harmonic resonance frequencies. Mitigation of such harmonic sources is vital. There is no safe rule to avoid such resonant currents, but resonances above 1000 Hz will probably not cause problems except interference with telephone circuits.. This means the …
Dynamic Capacitor (D-CAP) is equivalent to continuously adjustable capacitor when duty ratio ranges from 0 to 1. Applying theory analysis about delta-connected capacitor bank …
KS-T series of intelligent thyristor switch is the electric power compensation capacitor fast switching power devices, that is TSC dynamic switching switch, it''s kingser''s self-developed product to overcome the problems existing in similar products like harmonic ...
A dynamic reactive power compensation device with continuously adjustable capacity is designed for low voltage power grid. According to the time …
Abstract: A dynamic voltage restorer (DVR) is developed to stabilize the three-phase load voltage under the sudden grid voltage distortion conditions, including the voltage sag, swell and unbalance. The DVR is composed of a DC $backslash $ AC inverter and a DC-link capacitor regarded as the energy storage element. ...
Due to relatively low cost and flexible performance, Dynamic Capacitor (D-CAP) is often designed to implement dynamic reactive power compensation, whose output current might distort under the effects of background harmonic voltage from the grid or non-ideal PWM mode caused by non-linear switch characteristics. This paper presents a reactive power …
This letter proposes a new method for tuning compensation capacitances of wireless power transfer (WPT) systems using an artificial neural network (ANN). A field solver is used to analyze the compensation capacitances that maximize the output power at a set resonant frequency in a WPT system with ferrite shields. The compensation …
As discussed above, we aim to optimize the current utilization of the structure to improve the system''s current efficiency while maintaining loop stability. The proposed ASSF is based on Fig. 2 (c) and depicted in Fig. 3 (a), can seamlessly change its topology between SF and folded FVF with diode-connected PMOS according to the load …
Thyristor-controlled series capacitors (TCSCs) introduces a number of important benefits in the application of series compensation such as, elimination of sub …
An intelligent power capacitor with synchronous switching is designed, which can quickly switch on and off the reactive compensation capacitor. By accurately ca
Several shunts compensating devices are present to improve power quality and maintain voltage stability in the power system. But, each has one or other drawbacks like voltage support, dynamic ...
To study the influence of output capacitance parameters (capacitance, ESR) on loop compensation, a reasonable compensation network was designed to improve the stability and dynamic response performance of DC-DC converters. A small signal model of Buck converter controlled by peak current mode (PCM) and continuous conduction mode …
In this work, reactive power compensation for a 100 KW rated grid-connected system was investigated utilizing the most recent innovative technology STATCOMs and comparing it with the traditional fixed capacitors. Load dynamics for both scenarios have been
Dynamic capacitor (D-CAP) could be designed to compensate reactive power and suppress harmonic currents simultaneously by means of regulating DC and …
Abstract— A new technology, advanced dynamic capacitance compensation (A-DCC), for improved dynamic performance of LCD monitors, is presented. Conventional LCD monitors suffer from certain specific artifacts, such as wire-frame flicker and line dimming ...
2. Dynamic Voltage Restorer Sensitive loads are increasing day by day in the distribution system, so it is a dire need to enhance the power quality. These sensitive loads can be protected against voltage disturbances with DVR. DVR is …
One of an effective technique to enhance the electric power network is reactive power compensation which can be done either with synchronous condensers, series compensator, capacitor bank, shunt ...
A output capacitor-free low-dropout regulator (LDO) with fast transient response and ultra-small compensation capacitor is proposed. The slew-rate enhancement (SRE) circuit …
Dynamic Voltage Restorer as a Solution to ...
Due to relatively low cost and flexible performance, Dynamic Capacitor (D-CAP) is often designed to implement dynamic reactive power compensation, whose output current …
Compared with traditional static reactive power compensation devices, such as switched capacitor banks or reactor banks, dynamic reactive power …