Power Grid Frequency Regulation Strategy for Photovoltaic Plant Based on Multi-Objective Harris Hawks Optimization

Long Wang,Xiang Li,Yingying Jiao,Xucheng Chang,Wenli Huang

doi:10.3389/fenrg.2021.806263

Abstract

To settle the issue of balance between two objectives, i.e., photovoltaic (PV) power station output power maximization and frequency regulation (FR) signals response, a novel PV reconfiguration strategy is proposed in this work, which maximizes the output power through PV reconfiguration, and meanwhile utilizes the energy storage system (ESS) to decrease the PV plant generated power’ deviation from FR signals. Above all, a model of PV-storage power station reconfiguration is designed to minimize the power bias of both rated power and FR signals. Then, the multi-objective Harris hawks optimization (MHHO) is used to obtain the Pareto front which can optimize the above two objectives due to its high optimization efficiency and speed. Subsequently, the optimal compromise solution is selected by the decision-making method of VIseKriterijumska Optimizacija I Kompromisno Resenje (VIKOR). Aiming to substantiate the efficacy of the proposed technique, the case studies are carried out under partial shading condition (PSC) with constant and time-varying FR signals. The simulation results show that, compared with the situation without optimization, the power deviations of the two objectives are reduced by 25.11 and 75.76% under constant FR signals and 23.27 and 55.81% under time-varying FR signals by proposed method, respectively.

Highlights

Nowadays, major countries in the world are committed to developing the application technology of renewable energy resources to tackle the incoming traditional energy crisis
multi-objective Harris hawks optimization (MHHO) algorithm introduces the parameter of E: the flock performs soft besiegement based on Eq 13, if |E| < 0.5, otherwise the hard encirclement would be executed based on Eq
Founded on PV array reconfiguration, a new technique of PV station participating grid frequency regulation (FR) is presented in this work

Summary

Introduction

Major countries in the world are committed to developing the application technology of renewable energy resources to tackle the incoming traditional energy crisis. Photovoltaic (PV) arrays operate at the maximum power point by maximum power point tracking (MPPT) (Salam et al, 2013; Yang et al, 2016) technique to maximize the outputs of PV station. In the field application of large-scale PV power generation system, the bypass diodes of PV panel will be activated under partial shading condition (PSC), resulting in inconformity of output characteristic between various PV array rows (Sai Krishna and Moger, 2019; Zhang et al, 2021a). Further consequence of multi-peak with power-voltage (P-V) curve is caused which can prominently decrease PV plant power generation and make it more difficult for MPPT.

Objectives

Methods

Findings

Conclusion