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This paper proposes a novel control technique for the DSTATCOM. The DSTATCOM in this paper is connected to a distribution system with a DFIG based wind farm acting as a source. The DFIG here is considered to be operating in islanding mode. There are a large number of DSTATCOM controllers proposed. In this paper a novel optimised Icosf controller is proposed to reduce the THD level. The controller...
The impact of Dstatcom size and location on the voltage regulation of a distribution system is investigated in this research work. Possibility of coordination between Dstatcom units at different locations in the system is investigated. Dstatcom model available in Matlab Simulink is adopted for the study. The dynamic behavior of the Dstatcom due to switching on a large industrial load, line outage...
Custom power park is an industrial/commercial park that integrates state-of-the-art power quality devices. The power quality devices can be classified into two catalogues: voltage quality enhancement devices and current quality enhancement devices. In order to meet the requirement of large capacity, high reliability, high flexibility in both the voltage and current compensation, several operation...
A Distribution Static Synchronous Compensator (DSTATCOM) is introducing here to compensate the voltage sag problem by injecting proper reactive current at the point of common coupling. In this paper, the performances and effectiveness of DSTATCOM to nullify the voltage sag are analyzed and a control algorithm based on PI and Hysteresis PWM current controller is developed to verify the results. A 6...
Among the different disturbances affecting the power quality, the voltage sag are considered as a most important power quality problem faced by utilities, industrial consumer & equipment like PLC (Programmable Logic Controller), ASD (Adjustable Speed Drives) which need to be fully investigated. Custom power device are effective means for mitigating the voltage related issues prominently voltage...
The dc link voltage of the unified power quality conditioner (UPQC) is maintained at certain preset value during the steady state. However the dc link voltage can significantly deviate from its reference during a transient event, caused by load connection/disconnection or/and supply side voltage sag/swell. During such transients, due to significant deviation in the dc link voltage, the series injected...
DSTATCOM exhibits high speed control of reactive power to provide voltage stabilization, flicker suppression and other types of system control. In this paper, a DSTATCOM with T-connected transformer and star/delta connected transformer are used to improve the power quality in presence of linear unbalanced and nonlinear loads. Also, a fast acting DSTATCOM is used instead of conventional DSTATCOM, which...
Voltage source converter based DSTATCOM has been accepted as the most preferred solution for reactive power management in distribution power networks which plays a vital role in improving power quality, correcting power factor and maintaining constant distribution voltages. However, the quality of DSTATCOM output voltage and current itself, such as injected harmonics and Total Harmonic Distortion...
A control strategy using sliding mode variable structure control with an integral action is used for DSTATCOM. The steady-state error of compensation current control is effectively reduced, and the response speed is increased by the integral action. The control strategy has good robustness to parameter disturbance in both transient and steady states. The strategy uses sliding mode variable structure...
Voltage flicker, a phenomenon of annoying light intensity fluctuation, caused by rapid change in industrial and domestic load such as saw machine operating periodically has been a major concern for supply utilities and customers in the vicinity. The sawmill current is of quasi-periodic with a frequency of about 10 Hz causing perceptible flicker. The FACTS devices like SVC's, STATCOM and Custom Power...
This paper deals with the design, analysis and simulation of an online voltage envelope estimator and an online feed-forward neural network (FFNN) controller based distributed static compensator (DSTATCOM) controller. Existing controllers such as PI controller and offline neural network controller are fixed structures and provide satisfactory control only for certain problems for which they are designed...
Voltage sag(instantaneous voltage drop) of the grid system is the most frequent power quality problem. The impact of sag to the sensitive loads is severe. And load disruptions by sag bring about substantial economic losses up to millions of dollars. DVR is one of the CPD(custom power device) that can mitigate the voltage sag. It operates as a series connected compensator whose output voltage can control...
Voltage flicker, a phenomenon of annoying light intensity fluctuation is caused by electric arc furnace (EAF). Voltage flicker is a major power quality concern for both power companies and customers. This paper presents a model of EAF and control algorithms for distribution static synchronous compensator (DSTATCOM) for voltage flicker mitigation. The EAF was modeled as a current source controlled...
Industry customers of supply utility such as, electric arc furnaces and arc resistance welder and other such time varying loads which are cyclic in nature are the major flicker source to influence the grid power quality. Distribution STATic Synchronous COMpensator (DSTATCOM) with Battery Energy Storage System (BESS) is proposed as a viable and effective alternative for mitigation of flicker. This...
This paper presents simulation studies of an electric arc furnace (EAF) model in the MATLAB/SIMULINK environment. EAF was modeled as a current source controlled by a non-linear resistance. Voltage flicker, a phenomenon of annoying light intensity fluctuation, caused by EAF, has been a major power quality concern for both power companies and customers. A model was developed for the electric arc furnace...
The voltage flicker, a phenomenon of annoying light intensity fluctuation, caused by rapid change in industrial and domestic load such as electric arc furnaces (EAF), rolling mills, welding equipments and pumps operating periodically has been a major concern for supply utilities, electricity regulatory agencies and costumers. The FACTS devices like SVCpsilas, STATCOM and Custom Power devices like...
With the deregulation of the electric power energy market, providing quality power has become an important concern of both power suppliers and customers. Efforts have been made to improve the power quality using passive filters, active power filters, hybrid filters and the new concept of custom power. This paper presents a comprehensive review of compensating custom power devices mainly DSTATCOM (distribution...
DSTATCOM can compensate voltage sags by injecting the reactive power into the distribution system; however, the false compensation due to the interaction with system could occur. In this paper, the design considerations of DSTATCOM for voltage sag compensation have been studied. The voltage sag compensation performance with different current injection schemes is briefly explained and the interaction...
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