A compact control algorithm for reactive power compensation and load balancing with static Var compensator

• Published in: Electric power systems research 2001-06, Vol.58 (2), p.63-70
• Main Authors: Lee, San-Yi, Wu, Chi-Jui, Chang, Wei-Nan
• Format: Article
• Language: English
• Subjects: Electric power quality; Reactive power; Static Var compensator; Unbalanced power system
• ISSN: 0378-7796; 1873-2046
• DOI: 10.1016/S0378-7796(01)00127-4

A compact control algorithm for reactive power compensation and load balancing with the static Var compensator (SVC) in three-phase three-wire systems is developed in this paper. The required compensation susceptance of each SVC phase can be obtained from a very simple function of voltage and power signals which are measured by a three-phase voltage transducer and two single-phase active and reactive power (P–Q) transducers at the load bus. The calculation of compensation susceptances is based on the criterion of a unity power factor and zero negative-sequence currents after compensation. A simulation is made, as the first stage, to show the validity of the proposed compensation algorithm. Then, a laboratory size microcomputer-based SVC, which consists of thyristor-controlled reactors (TCRs) and fixed capacitors (FCs), is designed and implemented. Simulation and experiment results show that the algorithm is very suitable for on-line control of the SVC which is designed for phase balancing and power factor correction.