Guohong Wu

Mitigating fluctuation of wind turbine power generation system by introduction of electrical energy storage with combined use of EDLC and Lead Acid Storage Battery

In this paper, we have studied an approach to solution of these fluctuation problems caused by wind turbine generators in a distribution power system by way of combined use of two different types of energy storage system: one is EDLC (Eclectic Double Layer Capacitor) and the other is Lead Acid Storage Battery (a kind of Rechargeable Batteries). The EDLC has the property of extremely quick response and be used as a meaning to mitigate the sharp fluctuations, however it is costly. The battery is slow response and be introduced with large capacity on account of its low cost to absorb the slow variation. The mathematical model based on equivalent circuits for both of these energy storage devices are derived and completed in this work. Digital simulation with these proposed analytical models connecting to a typical wind power system model have been conducted, and the simulation results have illustrated the facts that the combination of properly controlled EDLC and lead acid storage battery can effectively suppress the power fluctuation and lessen the impact of wind turbine generation on distribution power system.

Construction and operational properties of offshore wind farm power generation system with self-commuted HVDC transmission

As one of the renewable and clean energy resources, wind power is attracting considerable attentions and becoming most developing renewable energy resources due to its large unit capacity, etc. This paper make an basic approach to the construction of offshore wind farm power generation system, which is considered to be a promising way to increase the practical utilization of wind power. In this paper, the concepts of prediction of offshore wind data from measured land wind data, the basic construction of wind farm, the design of wind power transmission circuit and the control of various power equipments for an offshore wind farm generation system, are dealt with and presented. With this proposed system, a self-commutated HVDC transmission system is adopted to transmit wind power from offshore to the power grid on land. As a result of simulation study with an one-machine infinite bus power system model on PSCAD/EMTDC platform, the electrical characteristics of the proposed offshore wind power generation system are illustrated and its operational properties are verified.

A study of micro hydraulic power generation system with DC voltage compensation by energy storage system

Along with the increasing common concerns on global warming and exhaustion of fossil fuels, renewable and environmental friendly energy sources are being considered to be viable for alternative energy. Among them, hydraulic power generation is high-energy density and hence even small-scale generating plants can provide considerable power and can operate with relatively stable condition compared with the solar and wind power generation. In this paper, a basic structure of micro hydraulic power generation system is proposed, and the cases that this kind of power generation system is supplying power to some local loads operating in isolated condition and power grid interconnected condition at remote area is studied by conducting digital simulations. By taking the variation of water flow from the small river and the change of load into consideration, the operational properties such as the water flow adjusting behavior of a regulating pondage and the voltage compensation effect by a battery system are examined and verified.

Technological assessment for developing new wind power generation systems

This paper describes the technological assessment employed in the development of new wind power generation systems, which facilitate stable, controllable energy supply systems in a diversified and competitive energy market. The concept of a new wind power generation system is presented and possible solutions to technical problems for the development of new wind power systems are discussed.

Concept and Requirements of Asset Management System fro Competitive Electric Utility Under Deregulation

This paper describes the concept, philosophy and methods required for improvement of asset management under conditions of competitive electric energy supply, and presents state-of-the-art of highly integrated planning, operations and management systems. This paper suggests a framework to clarify the interactions among various economic and engineering issues in terms of practical master database. Blackouts caused by human error require compensation. Employee education and training is important for enhancement of intelligent assets. Practical measures are also presented to deal with these issues.