Analysis of sliding mode controller based DSTATCOM for power quality improvement in distribution power system

Abstract

In this paper, Sliding Mode Controller-based Distribution Static Compensator (DSTATCOM) is proposed for enhancement of power quality in the distribution network. The DSTATCOM plays a vital role to enhance the quality of power in the distribution network with linear and nonlinear loads under non-stiff sources. During the load disturbance in the systems, there is a sudden variation of voltage in DC link capacitor voltage connected with compensating device. The performance of DSTATCOM purely depends on the capacitor voltage level during load variation. It should be maintained within the prescribed limits. In general, the conventional controller is used in the converter to control dc-link capacitor voltage. Through, the conventional controller like PI transient response is still slow. Due to this reason, the harmonic elimination, load balancing, and reactive power compensation process are not satisfactory during different load variations in the distribution systems. To overcome these problems sliding mode controller is proposed in the control circuit for the proper operation of the compensator. The sliding mode controller regulates the DC link capacitor voltage to generate required reference currents. The reference currents play a vital role for switching pulse generation and control of DSTATCOM during various load disturbances. Sliding mode controller is designed to limit variation of DC-link voltage within limits. The proposed technique is modelled and its performance is simulated in MATLAB/SIMULINK platform and results are shown to validate the design and control of DSTATCOM under various load disturbance.