Abstract—Distribution Static Compensator (D-STATCOM) is a custom power device which compensates reactive power and mitigates unbalances caused by various loads in distribution system when it is operated in current control mode. When D-STATCOM is used for load comprehensive compensation, the precision in detecting the compensation current required by the system is very important for compensation effects. There are many detection methods at present. This paper evaluates and analyses three different conventional and extensively used methods of determining the compensating current for a D-STATCOM under abnormal voltage conditions i.e. asymmetric and distorted source voltages and makes comparison of the performance of each one. The algorithms compared are instantaneous reactive power theory (IPRT), synchronous reference frame theory (SRF) and I-cosф algorithm. All three algorithms are simulated under MATLAB environment using Simulink. The theoretical analysis and simulated results illustrate the performance and correctness of these algorithms under asymmetric and distorted source voltages. Finally, the comparison of simulated results has been done to show the accuracy in detecting the harmonics and effectiveness of compensation under abnormal voltage conditions.

Index Terms—D-Statcom, harmonics, reactive current, instantaneous reactive power, detection method, synchronous reference frame, compensation current, matlab simulation.

Cite: Abhishek Kumar, Vinay Kumar Dwivedi, Santanu Maity, and Mohit Bajaj, "Performance Comparison of Control Algorithms for Load Compensation Using D-STATCOM under Abnormal Source Voltage," Jounal of Automation and Control Engineering, Vol. 2, No. 1, pp. 54-58, March, 2014. doi: 10.12720/joace.2.1.54-58