State Space Model of Distributed PV System for Network Voltage Management

摘要

The increasing penetration of rooftop photovoltaics (PVs) into the low voltage (LV) network in recent years, poses new challenges for maintaining grid stability and voltage regulation. Recent network codes require PVs to participate in grid support services, especially voltage support. To study the dynamic interactions between PV systems and the LV distribution network within a reasonable simulation time, this paper derives a linear state-space model of a two -stage PV system operating at maximum power point (MPP) with reactive power support capability. The linear state-space model is verified against a detailed component-level PV system in MATLAB/ Simscape Power Systems™. It accurately captures all system dynamics for the small deviations expected in grid support service (GSS) operation and allows large dynamic simulations to be computed 2200 times faster than the full switching model.