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Electrified railway system is a huge single phase load which imposes some serious power quality problems such as negative sequence current (NSC), harmonics, low power factor, pantographs arcs, resonance, electromagnetic interference, etc. to power grid. Several compensation strategies and configurations such as RPC, APQC, HBRPC, and etc. have been introduced up to now. The main problem corresponding...
The extension of electrical railway systems causes critical power quality problems in the power grid. This paper presents a kind of Half-Bridge Railway static Power Quality Conditioner (HBRPQC) based on a half-bridge converter which can compensate Negative Sequence Currents (NSC), harmonics and reactive power simultaneously. In this paper, a new multifunctional control strategy based on modified instantaneous...
This paper presents a new control approach for voltage source inverters ended with LCL filters for microgrid applications. The control approach consists of voltage and current inner control loops in order to fix the filter capacitor voltage and a virtual impedance loop. The virtual impedance is added in order to mitigate the voltage distortion after the output inductor and improve the load sharing...
In this paper, a hierarchical control scheme is proposed for enhancement of Sensitive Load Bus (SLB) voltage quality in microgrids. The control structure consists of primary and secondary levels. The primary control level comprises Distributed Generators (DGs) local controllers. Each of these controllers includes a selective virtual impedance loop which is considered to improve sharing of fundamental...
In this paper, a control approach is proposed for selective compensation of main voltage and current harmonics in grid-connected microgrids. Two modes of compensation are considered, i.e. voltage and current compensation modes. In the case that sensitive loads are connected to the point of common coupling (PCC), voltage compensation mode is activated in order to provide a high voltage quality at PCC...
This paper discusses a controller based on a proportional-repetitive control for a dynamic voltage restorer (DVR). Repetitive control can achieve zero steady-state error of tracking sinusoidal signal, but it doesn't make a quick response to the disturbance and needs at least one fundamental cycle to function properly. The control system based on proportional-repetitive controller, in stationary frame...
In this paper, a hierarchical control scheme is proposed for enhancement of sensitive load bus (SLB) voltage quality in microgrids. The control structure consists of primary and secondary levels. The primary control level comprises distributed generators (DGs) local controllers. Each of these controllers includes a selective virtual impedance loop which is considered to improve sharing of fundamental...
In this paper, a microgrid hierarchical control scheme is proposed which includes primary and secondary control levels. The primary level comprises distributed generators (DGs) local controllers. The local controller mainly consists of active and reactive power controllers, voltage and current controllers, and virtual impedance loop. A novel virtual impedance structure is proposed to achieve proper...
In this paper, a method for voltage harmonic compensation in a microgrid operating in islanded and grid-connected modes is presented. Harmonic compensation is done through proper control of distributed generators (DGs) interface converters. In order to achieve proper sharing of the compensation effort among the DGs, a power named “Harmonic Distortion Power (HDP)” is defined. In the proposed method,...
This paper deals with design and implementation issues of a DSP-based single-phase shunt active power filter under distorted voltage source. Some details about the digital controller using a DSP, based on a direct current method, including the hardware synchronous, software design and soft-startup are presented. The designed shunt active filter with its current controller has been tested under a highly...
This paper deals with design and implementation issues of a DSP-based single-phase shunt active power filter(SPSAPF) under distorted voltage source. A modified control strategy based on instantaneous reactive power theory (p-q theory) is proposed in this paper. Theoretical formulations for both original and modified p-q theories are presented. Simulations of the system in MATLAB\Simulink environment...
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