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Circuit breaker (CB) installed for capacitor bank is the CB which commonly experiences the switching process due to the capacitor bank function as a voltage regulator. In closing switching process, CB encounter transient condition due to inrush current. In this paper, the simulation for studying the inrush current characteristic of capacitor bank switching in Indonesia has been performed. Simulation...
This paper deals with the interruption scheme designed using Vacuum Circuit Breaker (VCB) based on zero crossing characteristics, implemented electromechanically for High Voltage Direct Current (HVDC) system. The operation is carried out using Mechanical scheme as it has minimum energy loss in comparison to Solid-State and Hybrid schemes. The Mechanical scheme consists of series connection of multiple...
This paper presents dV/dt control technology that enables lower switching loss and surge, especially higher speed switching of silicon carbide (SiC) devices. This technology is a surge reduction method using a high-speed passive gate driver that independently controls turn-on and turn-off events. Experimental results for a prototype gate driver confirmed that switching loss can be reduced by half.
Capacitive DC links provide the only low-impedance current path connected with an input source during the start-up of many voltage source converters. A soft-start circuit is usually implemented to limit the inrush current. A two-terminal active capacitor is recently proposed which can directly replace conventional passive capacitors in DC links, with reduced cost or size for a given application. The...
Nowadays the phase controlled switching is a preferred method for capacitive switching. Thus the distribution of prestrike gaps is an important issue for the control strategy. The objective of this paper is to understand the distribution of prestrike gaps for the contact materials manufactured by arc-melted and infiltration preparing technology in the capacitive service condition of 40.5kV vacuum...
Vacuum circuit breaker (VCB) is a mature technology which is commonly used in medium voltage power systems worldwide. However, it is still facing challenges to switch capacitive current, especially for back-to-back capacitor bank switching. The main reason is that the inrush current can cause serious damages to the contact surfaces and further deteriorate the high voltage withstand ability of the...
In Indonesia, there are many capacitor bank installed to regulate the nominal voltage. Currently, the Recovery Voltage (RV) data related to the capacitor bank switching is unavailable, whereas this data is very important to analyze Circuit Breaker (CB) performance to understand whether it will success to interrupt the current or not. In addition, if the CB cannot retain the RV, it will degrade the...
The benefits offered by the DC energy distribution in different applications raised the interests towards new power architectures and apparatus. The availability of the related LV and MV apparatus and protection schemes is in fact crucial to fully exploit the opportunities opened in the energy management for the smart grid. Experimental results of testing DC circuit breakers based upon current injection...
This paper presents mainly on the basis of open loop L-Z source inverter. By using the power electronics converter the distributed generating system is connected to the grid. In that by adding inductance and diode to the input side of power electronic converter the input voltage to be boosted and eliminates the ripples in the input current and reduce the inrush current. In the distributed generating...
This paper proposes an inrush current suppressor for a squirrel-cage induction machine (SCIM) with phase-leading capacitors using a matrix converter (MC) in a large-capacity wind power generation system (WPGS). The reference output voltage of the MC is determined by multiplying the SCIM current with the variable control gain. Thus, the MC performs as resistors for the inrush current of an SCIM with...
Capacitor switching is one of the most important sources of generating transient overvoltage and inrush current of electrical power system. Energizing transient may reduce the life span of capacitor banks, damage of power system equipment and insulation failure. This paper, presents three technologies used to mitigate transients caused by capacitor switching. ATP program is used to simulate capacitor...
Switched-capacitor based regulator has its unique usage in various power management applications where both small foot print and flexible current capability is required since the switched-capacitor power stage is scalable with current rating and thus opens possibility of fully on-chip implementation whereas inductor based regulator is very limited by inductor size due to the only availability of off-chip...
We propose a low surge voltage and fast speed gate driver with switched capacitor circuit for Silicon-Carbide (SiC) MOSFET. Because of the high switching frequency of SiC MOSFET, the surge voltage becomes a serious problem which cause a high switching loss and may break the SiC MOSFET. There is a trade-off between surge voltage and switching speed. It is hard to fulfill both of them at the same time...
This paper proposes on-chip soft-start method with minimum extra components and turbulence free start up of dc-dc converter. During the soft start, the output voltage is slowly increased to the steady state value so that the inrush current and overshoots are prevented. The proposed topology is implemented in buck converter designed to give 3.3V output for wide supply range of 4.5V to 18V and load...
Back-to-back capacitive bank switching is the most severe duty among capacitive current switching duties because the amplitude of the inrush current with high frequency is very large. In this paper, 36kV back-to-back capacitive current switching tests of test duty 2(BC2) were carried out with vacuum circuit breaker. And the tests were performed with a series of separate making tests of 120 operations...
Restrike caused by interrupting capacitor banks with vacuum circuit breakers will lead to severe switching overvoltage, which may cause great damage to power system. Reducing the probability of restrike during capacitive current breaking is the ultimate solution to limit overvoltage. In this paper, a new design of vacuum circuit breaker with a very low probability of restrike is proposed based on...
Shunt capacitor bank switching was a frequent and challenging operation duty for vacuum circuit breakers (VCBs). The designing and selection of contacts should be taken into as it is a core component which can directly impact arcing behavior in vacuum interrupters (VIs). The objective of this paper is to investigate the capacitive current switching performance of three different contacts, including...
Controlled switching is a solution for the reduction and elimination of high frequency transient currents and voltages that occur during the switching of reactive plant (shunt capacitor banks and reactors). This type plant may be frequently switched by system operators in order to maintain acceptable voltage limits and therefore if switching is uncontrolled, this may present significant power quality...
This paper proposes analysis of boost converter with super-twisting algorithm under sliding mode operation in continuous conduction mode. The super-twisting algorithm reduces the chattering effect which is inherent in conventional sliding mode control. This control minimizes the initial current peak and provides output voltage regulation irrespective of input voltage perturbation and load changes...
Shunt capacitors provide a cost-effective solution to alleviate voltage constraints in HV/EHV power systems and are widely used for voltage and reactive support. However, during planning and design phase, engineers are often faced with a challenge to choose appropriate transient mitigation/control arrangements ranging from pre-insertion resistors/inductors and current limiting reactors (CLRs) to synchronous...
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