Experimental study on system stability evaluation in parallel running of a superconducting generator and a SMES

Abstract

Parallel running operation of 100 kVA Superconducting Generator (SCG) with high response excitation and 0.4 MJ SMES (Superconducting Magnet Energy Storage) was carried out. The exciter capacity of the high response excitation is rather large compared with that of conventional generators. The exciter controller, that is, AVR (Automatic Voltage Regulator) and PSS (Power System Stabilizer) are designed taking the exciter power change at the excitation into account to improve the system stability. The SMES can also improve the power system stability. The SMES can give the small active power modulation of sinusoidal wave to the system. The system responses due to the SMES power modulation were observed and analyzed in order to evaluate the designed control functions of AVR, PSS and SMES. Frequency characteristics of the designed control functions were obtained from on-line data of the system. The system stability of parallel running of the SCG and the SMES was evaluated by use of SMES power control.

Superconducting Magnetic Energy Storage unit, an efficient energy technology for power systems

“…P sm and Q sm are respectively, the actual active and reactive powers inputted to the SMES unit. Knowing P sm , Q sm and the present value of the inductor current I sm , the firing angles of the converter stations can be calculated as given in (7) and (8).…”

“…Due to this characteristic, SMES applications in power systems have been given a great attention by electric utilities. These applications include load levelling, dynamic stability, transient stability, voltage regulation, and reactive power compensation, correction of power factor, elimination of current harmonics, frequency regulation, transmission line stabilizer, and power quality improvement [4][5][6][7]. This paper shows the different applications of SMES units to improve power system performance.…”