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The performance of the DSTATCOM depends on the control algorithm i.e. the extraction of the current components. So, for this, there are various control algorithms for the control of DSTATCOM block depending on various theories and strategies like phase shift control, instantaneous PQ theory, synchronous frame theory, Adaline based theory. Each of the algorithms specified have their own merits and...
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...
This paper deals with different control strategies for DSTATCOM (distribution static compensator) for power quality improvement for a three-phase, three-wire distribution system. A three-leg voltage source inverter (VSI) configuration with a dc bus capacitor is employed as DSTATCOM. The hysteresis as well as PWM current controllers are designed, analyzed and compared for PI controller and sliding...
The paper discusses a DSTATCOM topology for compensating ac loads in the three-phase, four-wire systems as well as supplying dc loads from its dc link. Its state space modeling is presented. The transient response of the compensator is very important while compensating dynamically varying loads. Any change in the load affects the dc link voltage directly. Generally, a closed loop proportional integral...
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