Sample Entropy Based Net Load Tracing Dispatch of New Energy Power System

Shubo Hu,Wei Zhou,Zhengnan Gao,Feixiang Peng,Hui Sun,Changqiang Ding

doi:10.3390/en12010193

Abstract

The high-proportion of renewable energies is gradually becoming one of the main power supply sources and bringing strong uncertainties to the power grid. In this paper, a sample entropy (SampEn) based net load tracing dispatch strategy with a specific thermal generating mode is proposed. In this strategy, renewable energies are fully and preferentially consumed by electric loads, turned to net loads, to maximize the utilization of renewable energies. SampEn theory is utilized to evaluate the complexity of net load time series, based on which, the traditional power generators trace the complexity of the net load flexibly. According to the SampEn, a specific generating model of thermal generators is determined and the cooperation between thermal generators and pumped storage is realized, aiming at reducing the ramp power of thermal generators and increasing the throughput of pumped storage. The experiment simulation is developed on the 10-unit test system. Results show that the ramping power of the thermal generators are reduced 43% and 13% in the two cases together with the throughput of pumped storage is increased 44% and 27% on the premise that the economy of the system is maintained and renewable energies are fully consumed. Therefore, the efficiency and reasonability of the proposed dispatch strategy are confirmed.

Highlights

The modern power system is transforming to the third-generation power system, or called new energy power system, which mainly depends on those clean and renewable non-fossil energies [1], such as wind power [2], solar energy [3], and so forth
Flow chart chart of of power power system system net net load load tracing tracing dispatch based on sample entropy
This paper has presented a net load tracing dispatch strategy based on sample entropy (SampEn) focusing on the high-percentage renewable energy connected to the power grid

Summary

Introduction

The modern power system is transforming to the third-generation power system, or called new energy power system, which mainly depends on those clean and renewable non-fossil energies [1], such as wind power [2], solar energy [3], and so forth. In the new energy power system, the intermittent energies such as wind power and photovoltaic share the responsibility of power load demand together with the traditional power sources. The thermal power output in the traditional day-ahead power dispatch with high uncertainties will ramp up and down frequently. The reasonable determination of unit generating mode, which can respond to these strong uncertainties, but reduce the power output fluctuation and increase the utilization efficiency of non-fossil energies as well, plays an important role in the new power system dispatch

Results

Discussion

Conclusion