Abstract

This paper presents a case study of an isolated industrial power system for aluminum production. The novel concept is that the cost of aluminum electrolysis can be significantly reduced by innovative application of hybrid systems incorporating wind energy and low-grade coal. In addition, the low-grade coal, which sale is not profitable in the market, can be locally consumed by the isolated power system. The power system thus fully utilizes the local resources in an effective and economic manner. However, several technical and economic issues are still of concern because the industrial system is isolated from the state grid. This paper hence discusses these issues and demonstrates the feasibility of such a hybrid power system from the technical and economic perspectives.

Highlights

  • The ever-increasing demand for clean energy is stimulating the worldwide installation of wind generators to drive our future society

  • This paper presents an industry project of an isolated power system located in Inner Mongolian province financed by the China Power Investment Corporation, which is one of the five largest generation corporations of China [23]

  • The power system is located in Zhahazhuoer (ZHZE), Tongliao (TL) Region, Inner Mongolian (IMo) province, which is one of China’s largest energy producing provinces thanks to its substantial energy resources [26]

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Summary

Introduction

The ever-increasing demand for clean energy is stimulating the worldwide installation of wind generators to drive our future society. To overcome the above problems, one of the solutions is off-grid technology, which enables high penetration of wind power integrated into an isolated system. This paper presents an industry project of an isolated power system located in Inner Mongolian province financed by the China Power Investment Corporation, which is one of the five largest generation corporations of China [23]. The industry system was powered by coal-fired generators for the electrolysis of aluminum, which has been categorized into the high energy consumption sector of China [24]. The power balancing of this isolated system should be carefully investigated before the construction of such a system at this high wind penetration level The investment will result in higher and cleaner profits from aluminum production using the presented wind-coal technologies

Description of the Current Industry System
The Coal Resource
The Wind Resource
The Wind-Coal Hybrid Energy System
The Technical Demonstration on the Power Balancing of the Isolated System
Electrolytic Load
Wind Generator
Coal-Fired Generator
The Investigation on Power Balancing in Extreme Scenarios
Wind Power Profile
The Day with the Highest Average Output of Wind Power
The Day with the Lowest Average Output of Wind Power
The Day with the Highest Ramping Rate of Wind Power
The Economic Feasibility—An Analysis of the Investment Profitability
Internal Rate of Return
Parameters of the Financial Analysis of the Investment
The 1200 MW Thermal-Coal-Fired Power Plants
The Electrolysis Plant of 430 kTon Annual Production
The Electrolysis Plant of 350 kTon Annual Production
The Composite Isolated Power System
Findings
Conclusions
Full Text
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