Improvement of transient stability in microgrids using RSFCL with series active power filter

Abstract

Now a day's non-conventional energy sources like PV power and Wind power sources are well developed because conventional energy sources are reduced day by day and at the same time the population has been increased. These drawbacks can be overcome by developing the microgrids. In current trends, microgrid protection is a very challenging task. Due to the interconnection of several distributed generators, fault currents are produced. Resistive type superconducting fault current limiter is used for the protection of microgrids because its operating time is very less, it stops the abnormal currents with in the first cycle and continuity of supply is possible. But R-SFCL had some disadvantages, it is not compensated for the reactive power. Then voltage levels are not compensated, for that reason series active power filters are used along with R-SFCL. Here series active power filters are compensating the voltage magnitudes and reduce the harmonics and then transient stability is improved in the microgrids. This work is done using MATLAB/Simulink.

Utilizing Parallel Superconducting Element as a Novel Approach of Flux-Coupled Type SFCL to Limit DC Current in the System

“…This is why several different SFCL concepts and schemes have been presented and technically proven over the course of the last few decades [11][12][13], typically for use in power transmission and distribution networks. There are numerous common varieties, such as the saturated core [14], transformer [15], reactor [16], flux lock [17], magnetic shield [18], resistive [19,20], and many more.…”

“…In China, demonstrations of high-voltage SFCL projects have been carried out on grids with voltages ranging from 220 to 500 kilovolts of alternating current (AC) [21], 500 to 160 kilovolts of direct current (DC) [22], and 160 kilovolts of AC [23]. Due to the technical requirements of external grids and the quenching safety concerns of the SFCL, the nominal lasting period for the fault current suppression is often restricted to a few seconds [11][12][13][14][15][16][17][18][19][20][21][22][23]. In light of this, it appears that SFCLs' primary function is to quickly and effectively alleviate the effects of transient fault current.…”

“…SFCL construction is underway in Europe [12] on transmission lines and in Japan [13] on distribution lines. SFCLs with 22.9 kV and 154 kV are now being built in South Korea [14].…”

A PSO-Based Approach for Optimal Allocation and Sizing of Resistive-Type SFCLs to Enhance the Transient Stability of Power Systems

“…Simulation results of this paper show that the combination of suitable RSFCL and ECS can improve the transient stability of power systems better than employing stand-alone ECS. Transient stability improvement in microgrids using RSFCL with a series active power filter has been studied in [17], concluding that RSFCL with seriesactive power filters compensates for the voltage magnitudes and reduces the harmonics and therefore, results in the improvement of the transient stability. In [18], employing a method based on the equal area criterion, selecting the location of RSFCL and inductivetype SFCL (ISFCL) was investigated, taking into account the transient stability issue, and it was concluded that RSFCL is a better choice than ISFCL for improving transient stability power systems.…”

Vector-Proportional-Integral Control of Inductor-Capacitor-Inductor Active Power Filter under the Alpha-Beta Stationary Coordinate System

“…The injected harmonics can be compensated for with active power filters (APFs) in a precise, rapid and stable manner [5,6]. As a result, these filters have been widely adopted in various industrial sites [7][8][9][10]. Before injecting the harmonic compensation current to the load side, the AFPs must be connected to the grid [11].…”