Fig. 5 shows the basic simulation model of the DSTATCOM system. The considered load is a combination of resistance and inductance connected in series for each phase. The load is star connected 32kVA at 0.8pf The DSTATCOM model is simulated with above described p-q theory, SRF theory and Adaline based theory. Figs. 6(a)-(c) show the simulation models for these theories. The model assembled using mathematical blocks of SIMULINK block-set. The simulation is carried out in continuous mode at maximum step size of 1*10-6 with odel5s (stiff/NDF) solver

Fig5Performance Analysis

Fig. 5 : MATLAB based model of DSTATCOM System
Fig6Performance Analysis
Fig. 6(b)MATLAB Model of IRP theory
Fig6Performance Analysis
Fig. 6(b) : MATLAB Model of SRF theory

Fig6Performance Analysis
Fig. 6 (c) : MATLAB Model of ADALINE theory


The performance of DSTATCOM is studied for all three methods of control techniques. The following observations are made based on these results.

A. Control of DSTATCOM by p-q Theory

Fig. 7 shows the dynamic performance of DSTATCOM using the p-q theory based current extractor. The considered load is reactive at 0.8 lagging power factor. The iref is the real part of the load current. The load has been increased from 16kVA to 32kVA at 0.12sec and unbalanced is introduced at 0.18 sec. After 0.24 sec the dynamics are shown in reverse sequence. The operation of DSTATCOM controlled by the p-q theory is shown in Fig. 8. The dynamics and unbalance conditions are simulated as per the previous case. The delay in compensation can be seen from source current waveforms. This delay is due to the low pass filter (LPF) used for filtering power signals. Moreover, p-q theory uses voltage signals to compute instantaneous active and reactive powers, any distortion and unbalance in voltage will lead to inaccurate calculation of reference source currents which should contain only real fundamental frequency component of load current.

Representative APR 391%

Let's say you want to borrow $100 for two week. Lender can charge you $15 for borrowing $100 for two weeks. You will need to return $115 to the lender at the end of 2 weeks. The cost of the $100 loan is a $15 finance charge and an annual percentage rate of 391 percent. If you decide to roll over the loan for another two weeks, lender can charge you another $15. If you roll-over the loan three times, the finance charge would climb to $60 to borrow the $100.

Implications of Non-payment: Some lenders in our network may automatically roll over your existing loan for another two weeks if you don't pay back the loan on time. Fees for renewing the loan range from lender to lender. Most of the time these fees equal the fees you paid to get the initial payday loan. We ask lenders in our network to follow legal and ethical collection practices set by industry associations and government agencies. Non-payment of a payday loan might negatively effect your credit history.

Calculate APR