Modified parallel-structured signal decomposition algorithm for enhanced power quality and demand side response in standalone distributed generation
Abstract
This paper presents the comprehensive solution of demand side response and enhanced power quality in a standalone distributed generation system using modified parallel structured signal decomposition control algorithm (MPSSD). It is observed that in most of the conventional frequency locked loop (FLL) based algorithm dual-reduced order generalized integrator-frequency locked loop (DROGI FLL), The estimation of fundamental frequency positive and negative sequence components of load current in the alphabeta frame is primarily required to generate the source reference current for solving the power quality and demand response issues. However, modified parallel structured signal decomposition control algorithm (MPSSD) estimates the said both components directly without involvement of alphabeta frame transformation. Therefore, computational burden and estimation time requirement is reduced. As a result, the faster and high accurate dynamic response of proposed MPSSD control algorithm is achieved under transient behavior of distributed generation system. The main objectives in this paper is to provide harmonics free source current, load balancing under different demand side response conditions and reactive power control in solar-wind based distributed power generation system. This task is achieved by operating the voltage source converter through the switching patterns generated by MPSSD control algorithm. The entire system is built in MATLAB Simulink and results of various operating conditions are observed and found satisfactory.
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