The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Under a short-circuit fault in low-voltage dc microgrid, solid-state circuit breaker (SSCB) assumes the responsibility of the quick and effective isolation of the faulted area, while its own safety and reliability depends on the overvoltage suppression ability of its snubber. For SSCB snubber design, however, traditional method suited for converter switch snubber cannot be directly applied, because...
When a bus fault occurs in a low-voltage DC microgrid, solid-state circuit breakers (SSCB) on either end of the DC bus assume the responsibility of the isolation of the faulted section, while the freewheeling path attached between SSCB and the bus takes on the task of fault energy absorption and fault current damping. However, during fault interruption, the snubber attached in parallel with SSCB for...
Aiming at solving the problem of induction motor restart, which is affected by residual voltage when the power of the motor is interrupted and reapplied, a "flexible voltage" scheme have been proposed using a dynamic voltage restorer (DVR). When "flexible voltage" is applied to restart the induction motors, the motor can be quickly restarted with greatly reduced current surges...
Voltage-controlled terahertz phase modulation using vanadium dioxide reconfigurable meta-surfaces is presented and a proof-of-concept phase modulator operating at sub-THz frequencies is fabricated. We demonstrate the highest reported phase modulation of 60º at 85 GHz through a fully-integrated device platform.
The fundamental building block of cascaded static synchronous compensator used in distribution grid is H-bridge based converter module. In this paper a type of "plug and play" module was introduced to improve the device compensation performance and reliability. The module based on IGBT parallel connection was discussed about the design of electrical parameters and physical structure. In...
It is hard to determine critical point of voltage stability exactly for some online voltage stability algorithm and its decision-making time is required to be very small, which hinders its practical application on power system. A novel control strategy of voltage stability based on generator dynamic reactive power releasing is presented to deal with the problem. When voltage collapse happens, stator...
This paper applies the solar photovoltaic power generation to supply the power to the insulator power line detection system. The paper control the charging and discharging of the battery through the DC / DC, voltage and current regulation feedback circuit. This system has finished the anti-lightning of protection of the battery, overcharge protection, charge overcharge protection and anti-reverse...
In accordance with the advantage of conventional hysteretic current control method, this paper advances a novel control method for active power filter (APF). In conventional hysteretic current control, the hysteretic band (HB) is fixed and actual compensating current is limited in a fixed hysteretic band. When the voltage source inverter (VSI) works in high-frequency state, as the switching frequency...
MC (matrix converter) as a novel power converter with many virtues such as sinusoidal control input current and output voltage waveforms, bi-direction power flowing ability, as well as good characteristic of low-frequency performance, it has become a ideal power converter to excitate brushless doubly-fed wind generator. The frequency and amplitude of the output voltage and the grid-connected power...
In the control of high power induction machine drives, the effect of dead time should not be neglected in the low-speed range, especially in the condition of low loads because it can seriously distort stator current waveform and generate torque ripple. This paper presents some theoretical analysis for the dead time effect in open-loop control and current closed-loop control, and analyzes the mechanism...
This paper introduces a design of high voltage pulse power supply that uses storage battery as prime power resource. This high voltage pulse power supply system can work without alternating current power supply and can be controlled by the remote control centre. Besides, some important information can be gained and displayed on the computer, such as the position, status, measured feedback of output...
Based on the switching function algorithm of the traditional matrix converter, that of matrix rectifier (MR) is derived in positive and negative phase sequence with four-quadrant capability. Afterward that of MR under unbalanced input voltage conditions is also derived by detecting and using instantaneous values of input voltages. But the gained algorithm in the case is not fully suitable for the...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.