A Coordinated Dispatching Model Considering Generation and Operation Reserve in Wind Power-Photovoltaic-Pumped Storage System

Dai Cui,Fei Xu,Pengxiang Huang,Yunhai Zhou,Weichun Ge

doi:10.3390/en13184834

Abstract

Large-scale grid integration of renewable energy increases the uncertainty and volatility of power systems, which brings difficulties to output planning and reserve decision-making of power system units. In this paper, we innovatively combined the non-parametric kernel density estimation method and scenario method to describe the uncertainty of renewable energy outputs, and obtained a representative set of renewable energy output scenarios. In addition, we proposed a new method to determine the reserve capacity demand. Further, we derived the quantitative relationship between the reserve demand and the power system reliability index, which was used as the constraint condition of a day-ahead power generation dispatch. Finally, a coordinated dispatching model of power generation and reserve was established, which had the lowest penalty for curtailment of wind power and photovoltaic, as well as the lowest total operating cost for thermal power units, gas power units, and pumped storage power station. By simulating three different working conditions, the proposed model was compared with the traditional deterministic model. Results showed that our proposed method significantly improved system efficiency while maintaining system reliability.

Highlights

In recent years, wind power (WP) and photovoltaic (PV) have achieved sustained and rapid development
The results showed that the hybrid power generation system had good frequency regulation ability, stabilized the frequency of the system in a very short time, and improved the reliability of the power system
In order to verify the validity of the model in this paper, two different alternative decision making schemes were selected for comparative analysis under the same calculation example and parameters

Summary

Introduction

Wind power (WP) and photovoltaic (PV) have achieved sustained and rapid development. Large-scale WP and PV are connected to the grid and the generation side uncertainty of the power system is aggravated [1,2,3]. In Europe, balancing the power grid is mainly realized by using gas-based power generation units and pumped storage power station (PSPS), but natural gas is imported, and the geographical location of pump storage units is greatly restricted, which brings great difficulties to power grid balancing [4]. The increasing share of intermittent renewable energy generation and changing patterns of electricity demand pose challenges to the balance of the grid and to the security of the supply. In China, there are many studies on renewable energy and energy storage complementary power generation technologies, but chemical energy storage systems, such as batteries, are generally preferred

Methods

Results

Conclusion