Assoc. Prof. Dr. Md. Akhtaruzzaman
The National University of Malaysia
Research area: New cell structure, Intelligent materials, Solar cells, Photovoltaic device
Title: The Advancement of Inorganic Hole Transport Materials Towards Emerging ThirdGeneration Thin Flim Solar cells
Abstarct: Organic-inorganic hybrid solar cells (OIHSCs) such as perovskite solar cells (PSCs), dye-sensitized solar cells (DSCs) and bulk heterojunction solar cells (BHJSCs) have a growing interest in thin-film photovoltaic technology due to their lightweight, flexible and low-cost manufacturing processes [1,2]. However, there are a number of issues that currently restrict the commercialization of OIHSCs due to their efficiency, stability and reproducibility and fabrication in a large area. Numerous hole transport materials (HTMs) such as spiro-OMeTAD, poly(triarylamine), PEDOT: PSS, which are mostly organic derivatives, have already been established and incorporated into OIHSCs. Organic HTMs are unstable in water, heat and light, which ultimately reduces the stability of OIHSC. The synthesis and complex purification costs of organic hole transport materials are also another drawbacks in exiting OIHSCs. As a result, various inorganic metal oxides such as CuO, MoO3, WO3, NiOx, Cr2O3, etc. as HTMs have promising outcomes such as improving the carrier transporting properties within solar cell devices with higher life-time and stability. Among them, NiOx has recently gained significant attention due to its excellent optical, and electrical properties, along with its good chemical stability and easy fabrication of optically transparent dense films by several techniques. To further enhance the operational stability of OIHS, simultaneous system engineering such as interface modification of HTL / absorber layer, tuning of the crystallinity, morphology, and defect engineering should be considered to realize their full potential. Various experimental techniques would be investigated to find both the stability and performance of organic-inorganic hybrid solar cells towards the flexible solar energy revolution.
Prof. Michael Negnevitsky
University of Tasmania，Australia
Research area: smart grids, power system security
Title: High Renewable Energy Penetration and Power System Security: New Challenges and Opportunities
Abstarct:The word “security” in the context of a power system implies its security against a complete collapse, or a blackout. Secure operation involves practices aimed to keep the system operating normally when contingencies occur. An increasing penetration of intermittent renewable energy generation introduces additional uncertainties in power systems. However, the impact of variable generation on the system security is often exaggerated. On average, no significant mitigation measures are required until the wind and solar penetration reaches 20 per cent. The main challenge facing a power system with high penetration of renewables is the displacement of conventional synchronous generation by non-synchronous generation. Kinetic energy stored in the rotating masses of synchronous generators provides the system rotational inertia. Wind power generators are mostly doubly-fed induction or full-converter machines. Because these machines are either partially or completely decoupled from the grid by electronic converters, they do not provide inertia to the system. This reduces the total system inertia, and as a result, the system becomes more vulnerable to contingencies. Traditionally security assessment is performed based on deterministic criteria. The N-1 security criterion requires a power system to withstand an outage of any single system component without violating any system operating limits. This is based on the worst-case scenario criterion and provides a simple rule in the system design and operation. It has satisfied the needs of the power industry for decades. However, the deterministic approach to security is not adequate in modern power systems with market driven dispatch and high penetration of renewable energy and distributed generation. In this paper, security is defined as the risk in the system’s ability to withstand random contingencies without interruption to customer service. The higher the risk the lower the security, and vice-versa. System operational risk is defined as the sum of products of the probabilities of random contingencies that may occur in a particular system state and the expected cost of load interruptions caused by these contingencies. In calculating the operational risk, we consider not just the likelihood of contingencies, but also uncertainties in load variability and renewable energy generation. In risk-based security assessment, we generate contingencies at random, based on their probabilities. Then, we assess the consequences of these contingencies to determine whether loads are disconnected following voltage violations, overloads and significant imbalance between load and generation.
Prof. Jinghong Zhou
Changchun Institute of Technology, China
Research area: Electric Power Planning, Electricity Market
Title: Research progress and development trend of liquefied air energy storage technology
Abstarct: Introduce the basic principles, main advantages and disadvantages of liquefied air energy storage technology, research progress of liquefied air energy storage technology, main applications of liquefied air energy storage technology, development trend of liquefied air energy storage technology, etc.