A Novel Frequency Regulation Strategy for a PV System Based on the Curtailment Power-Current Curve Tracking Algorithm

Cheng Zhong,Gangui Yan,Yang Zhou

doi:10.1109/access.2020.2989785

Abstract

The challenges of modern power systems with a high level of renewable generation penetration will impose increased ancillary service on Photovoltaic (PV) systems, including frequency regulation. In this paper, a frequency regulation strategy for PV systems without energy storage is proposed. The proposed strategy is divided into two layers: the frequency regulation layer and the power reserve control layer. In the power reserve control layer, a novel power reserve control is proposed as the core element and novel feature. The existing power reserve control for PV systems must estimate the maximum available power, which is difficult because of the variation in environmental conditions and complex modeling of PV systems. Instead, a power tracking control method based on a curtailment power-current curve is proposed. It can automatically track a given reserve ratio under any environmental condition without an irradiance sensor. In the frequency regulation layer, the combination of droop control and virtual inertia control is used to adjust the given power reserve ratio. Simulation results show that the proposed strategy offers good accuracy and tracking speed and can significantly improve the frequency response of the power system.

Highlights

System frequency indicates the balance between power generation and consumption in an electric power grid
The other set is used to evaluate the performance of the proposed frequency regulation strategy for the PV systems (PVs) system
The power reserve control (PRC) is implemented in the DSP control board, and the remaining physical components of the PV system are simulated in the RT-LAB platform

Summary

INTRODUCTION

System frequency indicates the balance between power generation and consumption in an electric power grid. The online maximum power and current data can be utilized to obtain km by simple curve fitting calculations, which is a great advantage for industrial applications. VOLTAGE TRACKING CONTROL ALGORITHM It is interesting to note that the operating point located on the right side of the P-I characteristic curve will fall at the left side of the P-V characteristic curve, and vice versa

PV FREQUENCY CONTROL STRATEGY

SIMULATION RESULTS

CONCLUSION