Title :
A dynamic voltage restorer with an improved PLL for voltage sensitive loads
Author :
Govindarajan, Ramesh K. ; Raghav, P. Pankaj ; Ilango, G. Saravana
Author_Institution :
Dept. of Electr. & Electron. Eng., Nat. Inst. of Technol., Tiruchirappalli, India
Abstract :
Dynamic Voltage Restorers (DVR) are commonly used in the distribution network to protect voltage sensitive loads from the effects of voltage sags, swells and imbalances. This paper presents the modelling and control principle of a battery based DVR. The energy storage element is used to absorb and inject active power during steady-state operation. Finite Impulse Response(FIR) filter based PLL is used for generating a reliable voltage reference. The control strategy uses an inner current control loop and an outer voltage control loop for generating the inverter switching pulses. The performance of the system is investigated by MATLAB simulations and is validated using experimental results obtained from a 230 V system equipped with a 60 V/60 V, 1 kVA injection transformer. The response of the DVR to various voltage disturbances are presented.
Keywords :
FIR filters; electric current control; filtering theory; load management; phase locked loops; power distribution control; power distribution protection; power supply quality; power transformers; voltage control; FIR; MATLAB simulations; active power absorption; active power injection; apparent power 1 kVA; battery based DVR; distribution network; dynamic voltage restorer; energy storage element; finite impulse response filter based PLL; injection transformer; inner current control loop; inverter switching pulse generation; outer voltage control loop; voltage 230 V; voltage 60 V; voltage disturbances; voltage imbalances; voltage reference generation; voltage sags; voltage sensitive load protection; voltage swells; Batteries; Inverters; Load modeling; Phase locked loops; Power quality; Voltage control; Voltage fluctuations;
Conference_Titel :
Power Signals Control and Computations (EPSCICON), 2014 International Conference on
Conference_Location :
Thrissur
Print_ISBN :
978-1-4799-3611-3
DOI :
10.1109/EPSCICON.2014.6887499
