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SHUNT ACTIVE FILTER
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Active filters are being increasingly considered as a viable alternative to passive filters for meeting harmonic distortion limits. The three phase configuration based on a voltage source configuration is the most widely proposed topology. However its application is restricted to balanced systems, hence it may not be suitable for industrial and commercial applications, in which power is distributed through a four wire system. One alternative is the use of half-bridge converters.
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THREE-PHASE ACTIVE POWER FILTER CONTROL USING SYNC
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In this paper are presented the results of Matlab/Simulink simulation for a 3-wire electrical system supplied from grid to which in CCP (common coupling point) is connected a parallel active power filter (APF). For a full analysis, the APF is controlled by three different methods (synchronous reference frame, indirect and maximum). The analysis will aim three quality indicators: THDI (TDD) (total harmonic distortion factor of current), PF (power factor) and Iunb (unbalance of current).
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THREE-PHASE ACTIVE POWER FILTER CONTROL
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In this paper are presented the results of Matlab/Simulink simulation for a 3-wire electrical system supplied from grid to which in CCP (common coupling point) is connected a parallel active power filter (APF). For a full analysis, the APF is controlled by three different methods (synchronous reference frame, indirect and maximum). The analysis will aim three quality indicators: THDI (TDD) (total harmonic distortion factor of current), PF (power factor) and Iunb (unbalance of current).
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Instantaneous active and reactive current control
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In this paper, the synthesis and performance of a shunt active power filter (SAPF) based on instantaneous active, and reactive current components (idiq) technique is presented. The proposed active filter acts as a current source, which is connected in parallel with a nonlinear load and controlled to generate the required compensation currents. The proposed control technique for SAPF aims to compensate the harmonic current contents of nonlinear loads by connection of distributed generation (DG) resources based on renewable energy sources to distribution network. This modeling is derived from the 123(abc) to ab and ab to dq transformation of the ac system variables. The injected currents by the SAPF to polluted grid are controlled in synchronous orthogonal dq reference frame by using of decoupled current control technique. By use of phase locked loop (PLL) in control circuit of proposed technique, the angle of positive sequence has been detec
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A 100-Mvar STATCOM regulates voltage on a three-bu
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A 100-Mvar STATCOM regulates voltage on a three-bus 500-kV system. The 48-pulse STATCOM uses a Voltage-Sourced Converter (VSC) built of four 12-pulse three-level GTO inverters. Look inside the STATCOM block to see how the VSC inverter is built. The four sets of three-phase voltages obtained at the output of the four three-level inverters are applied to the secondary windings of four phase-shifting transformers (-15 deg., -7.5 deg., 7.5 deg., +7.5 deg. phase shifts). The fundamental components of voltages obtained on the 500 kV side of the transformers are added in phase by the serial connection of primary windings. Please refer to the "power_48pulsegtoconverter" example to get details on the operation of the VSC. During steady-state operation the STATCOM control system keeps the fundamental component of the VSC voltage in phase with the system voltage. If the voltage generated by the VSC is higher (or lower) than the system voltage, the STATCOM generates (or absorb
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