Power quality Problems and mitigation techniques (EX-802 (A)) - Important Questions

Define power quality and explain the reasons for increased concern about power quality.

What are the solutions for power quality problems? How can you check good quality of electrical power?

What is voltage fluctuation and why do lights dim when large appliances switch on?

Explain the causes and effects of power quality disturbances on sensitive loads and power system operation.

Write short notes on classification and working of passive series compensation.

Explain the operation of DSTATCOM with a neat sketch.

Compare SVC vs STATCOM and differentiate between an active power filter and a STATCOM.

Explain the classification, principle and control of active shunt compensator.

Explain the principle, working and operation of UPQC.

How are UPQCs classified? Explain briefly with their applications.

Discuss about the sources of sags and interruption and describe the mitigation of voltage sag.

Explain how the voltage sag performance is estimated?

Explain what power surges / spikes and impulse voltages are, why they occur, and methods to protect high-voltage and electrical equipment including surge protectors and safe working practices.

What commonly causes transient voltages? Explain the factors affecting transient recovery voltage.

Why is the zero-voltage crossing optimal for harmful transient mitigation, e.g., overvoltage when switching capacitor banks at a substation?

What is the best method to eliminate harmonics in a power system? How can filters reduce harmonics?