This paper proposes the application of a traditional dq controller to provide virtual inertia to the Solar PhotoVoltaic (SPV) based Distributed Generators (DGs) by adjusting its Phase Locked Loop (PLL) parameters. The relationship between the phase angle of inverter and power mismatch is derived in terms of the inertia constant. Based on this, an equivalent inertial constant expression is obtained. The proposed controller is tested for a SPV system connected to a grid represented by a Synchronous Generator (SG) which is double the rating of SPV system. Real Time Digital Simulator (RTDS) platform is used to investigate the effectiveness of the proposed scheme and its performance has been compared with a Virtual Synchronous Generator (VSG) scheme under load disturbances and bolted fault.
R. K. Panda, A. Mohapatra and S. C. Srivastava, "An Effective Inertia Control Scheme for Solar PV Systems with Conventional dq Controller," 2018 IEEE Power & Energy Society General Meeting (PESGM), Portland, OR, 2018, pp. 1-5.
KEYWORDS: Phase locked loops, Inverters, voltage control, frequency measurement, perturbation methods, solar pv, distributed generator, inertia constant, dq controller, virtual synchronous generator