Analysis and Simulation of a D-STATCOM for Voltage Quality Improvement

Analysis and Simulation of a D-STATCOM for Voltage Quality Improvement

ABSTRACT:

Voltage flicker is a major power quality concern for both power companies and customers. This paper discusses the dynamic performance of a (D-STATCOM) with ESS for mitigation of voltage flicker. The (D-STATCOM) is intended to replace the widely used static var compensator (SVC). A Distribution Static Synchronous Compensator (D-STATCOM) is used to regulate voltage on a 25-kV distribution network. The (D-STATCOM) protects the utility transmission or distribution system from voltage sag and /or flicker caused by rapidly varying reactive current demand. The (D-STATCOM) regulates bus voltage by absorbing or generating reactive power. This voltage is provided by a voltage sourced PWM inverter. The simulation is carried out using MATLAB/SIMULINK and the simulation results illustrate the performance of (D-STATCOM) in mitigation of voltage flicker.

KEYWORDS 

1.      Power Quality

2.       Energy Storage System (ESS)

3.       D-STATCOM

4.       Voltage Flicker

5.      Synchronous Reference Frame (SRF)

 SOFTWARE: MATLAB/SIMULINK

BLOCK DIAGRAM:

Fig. 1: D-STATCOM controller with d-q theory.

Fig. 2: Detailed Versus Average Model of D-STATCOM.

EXPECTED SIMULATION RESULTS:

Fig. 3: Output voltage of D-STATCOM.

Fig. 4: Output voltage of voltage source inverter.

Fig. 5: Output P & Q of D-STATCOM.

Fig. 6: Output current of D-STATCOM.

Fig. 7: I_q and I_qref of D-STATCOM.

Fig. 8: P and Q of terminal B₃.

Fig. 9: Terminal voltages B₁ and B₃.

Fig. 10: Changes of DC voltage.

CONCLUSION:

In this paper, D-STATCOM controller is derived by using synchronous reference theory. The model is simulated in MATLAB/SIMULINK platform and D-STATCOM controller’s performance is evaluated using dq theory for voltage flicker mitigation. The controller is proven to be effective for flicker mitigation with improved dynamic response of the system and compensating reactive currents will help the mitigation of voltage flicker.

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