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This paper presents the performance analysis of a single phase UPQC (unified power quality conditioner) device with a left shunt APF (active power filter) configuration, termed as left shunt UPQC. This device is applied for a special load configuration. One set of load is voltage sensitive with considerable reactive power demand. The other set consist of load which is quite unaffected by voltage disturbances...
This paper presents a new PAC-SRF based approach for UPQC to be used in single phase distribution systems. A necessary phase angle shift of load voltage is introduced with respect to the source voltage using the power angle control concept in order to integrate a reactive power sharing feature for series inverter part of UPQC. Synchronous reference frame (SRF) based controller is adapted for both...
Distributed static compensator (DSTATCOM) is an important power device for mitigation of harmonics, power factor correction and voltage regulation in a distributed network. This paper describes the conception and simulation of a three-phase VSC based DSTATCOM for a three phase ac mains feeding to linear and nonlinear loads. The operation of DSTATCOM is governed by a novel control technique known as...
This paper introduces a single-stage active power factor correction (PFC) AC-DC converter which provides almost unity power factor and minimizes the THD to 7.4 %. For a constant DC output voltage a single phase diode bridge rectifier with a large output capacitor is considered in this paper. This standard topology has a shortcoming of introducing lower order harmonics and become cause of poor power...
In this paper, a novel hybrid control approach has been considered which includes an artificial neural network (ANN), a zig-zag transformer and hysteresis current controllers (HCC) for a distributed static compensator (DSTATCOM). The hybrid controller is used for reduction of line current harmonics and for improvement of power factor in the system. The proposed controller pushes the source current...
This paper exhibits a relative investigation of different governing methods on a shunt active power filter for harmonics and VAR compensation for a balanced three phase system connected to a composite load. Three techniques, namely, instantaneous active and reactive power method, instantaneous active and reactive current control method and unit vector template method are used for the source current...
Shunt active power filter (APF) has been proven as an effective method to overcome various power quality issues such as reactive power unbalance, unbalanced source currents and large harmonic and neutral currents resulted due to the proliferation of nonlinear loads. Optimizing the performance of APF using conventional mathematical modeling based linearized approaches is quite difficult because of...
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