Minimizing the Impact of Intermittent Wind Power on Multiperiod Power System Operation with Pumped Hydro Generation

Aliyu Hassan,Yskandar Hamam,Josiah L Munda

doi:10.3390/en12183583

Abstract

In power system operations, unforeseen energy imbalances commonly occur, resulting in unexpected constraints on the system. This leads to a disturbance in normal operation. In systems with integration of large intermittent wind power resources, additional complications are imposed on the system, especially under heavy winds that require immediate measures to minimize possible impact of abrupt wind power fallout. Effective power system fortifications have to be put in place to address the challenges. Wind varies more on the sub-hourly time scales; therefore, sub-hourly dispatch is bound to address more of these issues than commonly used hourly methods. Hybrid power system operation with wind necessitates the use of fast start-up generation and storage to improve quality of power. In this work, the impact of intermittent wind power curtailment on power system operation is addressed to prevent system instability. A modified wind turbine power curve is used to restrict the onset of the normal cut-off point, thereby allowing sufficient time for effective power switchover with pumped hydro generation. This improves the voltage stability of the power system during curtailment. Singular value decomposition matrix of the power system network is employed to evaluate the performance of the proposed method.

Highlights

In conventional power system operation, power dispatch is implemented using the hour-ahead methods to take advanced decisions on available resources
This paper proposes a model to address wind power intermittence using the extended wind turbine curve to switchover between wind generation and Pumped Hydro Generation (PHG) on a power system operation incorporating sub-hourly dispatch
The results obtained in Cases I, II, III, and IV show improvements in the voltage stability of the power system when PHG is used to support withdrawal of the wind generation during high wind speeds that necessitate curtailment

Summary

Introduction

In conventional power system operation, power dispatch is implemented using the hour-ahead methods to take advanced decisions on available resources. A power operation taking into consideration sub-hourly variations in renewable power resources may perform better, in terms of reducing stress on the system, early problem detection, and maximizing power security. It is, necessary to use short-term power dispatch with lead time in minutes incorporated into the normal hourly methods to effectively manage intermittence from wind resources during hybrid power system operation. It is necessary to develop more effective power dispatch methods based on the sub-hourly framework. Techniques employed based only on the single hourly methods may not perform effectively as those incorporating the sub-hourly [2].

Methods

Results

Discussion

Conclusion