A practical control scheme for a series controller to enhance the quality of power supplied to a mobilephone telecom station

The customer awareness of power quality problems in power distribution systems has increased these years. In practice, lots of power quality problems were fond in a mobilephone telecom station supplied by a rural utility end, which caused severe damages to the major equipment inside the mobilephone station building, including the off-the-line switching mode power supply for the telecom equipment and the air conditioner. As a solution, a Series Power Quality Controller (SPQC) was developed by the authors and installed to condition the power supplied to the mobilephone station. For practical purpose, a new control scheme was proposed to substitute the regular control scheme and hereby introduced in this paper, in which two complicated feedback control loops are substituted by two coefficients and this scheme is quite easy to realize with advanced Digital Signal Processor(DSP). The proposed control scheme is very simple, but quite effective and highly reliable. Plenty of laboratory experiments and field tests in the mobilephone station were conducted and verified the validity of the developed SPQC and the proposed control scheme. The SPQC with the proposed control scheme has already been put into practical operation successfully.