Transient Stability Enhancement of a Grid-Connected Large-Scale PV System Using Fuzzy Logic Controller

Md Rifat Hazari,Narottam Das,Mohammad Abdul Mannan,Effat Jahan

doi:10.3390/electronics10192437

Abstract

This paper presents a new intelligent control strategy to augment the low-voltage ride-through (LVRT) potential of photovoltaic (PV) plants, and the transient stability of a complete grid system. Modern grid codes demand that a PV plant should be connected to the main power system during network disturbance, providing voltage support. Therefore, in this paper, a novel fuzzy logic controller (FLC) using the controlled cascaded strategy is proposed for the grid side converter (GSC) of a PV plant to guarantee voltage recovery. The proposed FLC offers variable gains based upon the system requirements, which can inject a useful amount of reactive power after a severe network disturbance. Therefore, the terminal voltage dip will be low, restoring its pre-fault value and resuming its operation quickly. To make it realistic, the PV system is linked to the well-known IEEE nine bus system. Comparative analysis is shown—using power system computer-aided design/electromagnetic transients including DC (PSCAD/EMTDC) software—between the conventional proportional–integral (PI) controller-based cascaded strategy and the proposed control strategy to authenticate the usefulness of the proposed strategy. The comparative simulation results indicate that the transient stability and the LVRT capability of a grid-tied PV system can be augmented against severe fault using the proposed FLC-based cascaded GSC controller.

Highlights

Due to the global warming issues of fossil fuel-based power stations and the increasing cost of energy generation, the presence of large-scale renewable energy sources (RESs) in current power systems has been increasing over the last decade
In light of the above discussion, this study introduces a new control approach based on fuzzy logic controller (FLC) to enhance the low-voltage ridethrough (LVRT) competency of a grid-tied PV station/plant
The automatic generation control (AGC) technique was adopted in SG1 and SG3; was SG2 directed as the governor free control (GF)

Summary

Introduction

Due to the global warming issues of fossil fuel-based power stations and the increasing cost of energy generation, the presence of large-scale renewable energy sources (RESs) in current power systems has been increasing over the last decade. [5,6], the global capacity of installed PV systems was 512 GW in. 2018 [5], and it will reach about 1.1 TW in 2022. A recent report showed that China, India, the USA, Japan, and Australia are in the top positions, having installed 44.3 GW, 10.8 GW, 10.7 GW, 6.7 GW, and 3.8 GW, respectively, in 2018 [5]. China’s total installed capacity reached 175.4 GW, retaining the country’s market leadership position [5]. In the USA, solar energy holds the most significant percentage of RESs [7]

Methods

Results

Conclusion