With the increase of power generation from renewable energy sources and due to their intermittent nature, the power grid is facing the great challenge in maintaining the power network stability and reliability. To address the challenge, one of the options is to detach the power generation from consumption via energy storage. The intention of this paper is to give an overview of the current technology developments in compressed air energy storage (CAES) and the future direction of the technology development in this area. Compared with other energy storage technologies, CAES is proven to be a clean and sustainable type of energy storage with the unique features of high capacity and long-duration of the storage. Its scale and cost are similar to pumped hydroelectric storage (PHS), thus CAES has attracted much attention in recent years while further development for PHS is restricted by the availability of suitable geological locations. The paper presents the state-of-the-art of current CAES technology development, analyses the major technological barriers/weaknesses and proposes suggestions for future technology development. This paper should provide a useful reference for CAES technology research and development strategy.

Overview of Compressed Air Energy Storage and Technology Development

国際会議報告 IEEE-Power Engineering Society Winter Meeting

Optimal displacement of photovoltaic array’s rows using a novel shading model

For reliable operation of an islanded microgrid, at least one of its distributed resources should assume the responsibility of forming the off-grid power system. This responsibility is usually assumed by energy storage systems based on their capability of compensating the unbalance between generation and consumption. However, the storage units lose this capability when they reach the maximum and minimum limits of charge. Under these conditions, the regulation of the power grid may be assumed by another unit with enough capability or the power balance should be adjusted coordinately. This paper proposes a coordination architecture for islanded ac microgrids, which considers the appropriate charge profiles for battery-based energy storage systems. The architecture is based on distributed decision-making mechanisms, which use only local measurements for determining the operation mode of each unit independently. The coordination relies on a bus-signaling method, which enables the distributed units to have a global perception about the operation of the microgrid, without any communication infrastructure. The proposed architecture includes cooperative operation between distributed energy storage systems for achieving the equalization of the states of charge. Experimental results in a lab-scale microgrid with network configuration validate the proposed strategy under different operational conditions.

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A Communication-Less Distributed Control Architecture for Islanded Microgrids With Renewable Generation and Storage

Service restoration, system reconfiguration, and other related problems are formulated and solved by heuristic search, which is a search strategy (e.g. depth-first search) armed with practical rules (say, based on operator experience) to guide the search. The proposed framework allows designing algorithms to solve a wide range of distribution restoration problems. System operator procedures can be accommodated as part of the search process. Test results are presented. An illustrative example is given in the Appendix.

Heuristic Search Approach to Distribution System Restoration

In this paper the connotation and the different definition of micro-grid were expounded, the basic structure of micro-grid was described, and the key technologies of smart grid were expatiated on. Finally, the directions for future research in our country of micro-grid are elucidated.

Overview on Micro-Grid Technology

Traditional central power supply and distributed generation have the advantages and limitations themselves. Micro grid technology can integrate the advantages of distributed generation and that makes for large scale new energy and renewable energy power generation system connected to the grid. First, the micro grid research background and significance are introduced in detail, then the current research situations of micro-grid at home and abroad are represented, in the end, the key problems and development prospect of micro grid are discussed emphatically.

Overview on Micro-Grid Technology Research

Active power filter (APF) is an important device to compensate harmonic and reactive current in power system control method adopted has a great influence on its performance. The paper introduces several control methods used by APF, including the deadbeat control, single-cycle control, space vector control and so on. After comparing and analyzing their individual advantages and disadvantages, some improvements for APF performance are proposed.

Control Methods of Active Power Filter

The effect of load model on the analyses of load flow, transient stability, small disturbance stability and voltage stability is analyzed. The importance of the load modeling research is emphasized. The development of component-based method and measurement-based method is reviewed. The advances on the load model research including the select ion of load model structure, model parameters identification, load model with the voltage stability analysis and the sensitivity of load model to the transient stability is summarized.

Review of Electric Load Modeling Research

Smart Grid is very important as it will take us towards energy independence and environmentally sustainable economic growth. This paper briefly discusses evolution of Smart Grid development, including the difference from conventional energy system, the characteristics of Smart Grid, the present research status, and the key technologies and technologies of Smart Grid.

You Jie Ma

Papers

Overview on Micro-Grid Technology

Overview on Micro-Grid Technology Research

Control Methods of Active Power Filter

Review of Electric Load Modeling Research

An Overview of Smart Grid