New Method for Stabilization of Wind Power Generation Using Energy Storage Technology
Department of Electrical Drives and Power Electronics,
Tallinn University of Technology, Ehitajate tee 5, EE19086 Tallinn, Estonia;
e-mail: firstname.lastname@example.org; email@example.com; firstname.lastname@example.org; email@example.com
Wind power appears to be one of the most perspective and widespread renewable energy sources in Estonia. However, wind is difficult to forecast. This complicates production planning and parallel operation with compensating power plants, allowing periods of excess energy and lack of energy to occur. This paper proposes a new energy storage technology to compensate unstable operation of windmills. This is based on a hydrogen buffer, which accumulates excess energy from windmills and transfers it to the DC-link of windmills converter. As all components of the hydrogen buffer are electrically connected to the DC-link, there are three main stages. The first stage is hydrogen production, which is realized with the help of water electrolysis in periods of excess energy. Interfacing is carried out with electrical components, such as DC/DC converter with a step-down isolation transformer. The second stage is hydrogen storage and delivery. The produced hydrogen is accumulated in a tank locally or in industrial gas storage. Hydrogen may be mixed with natural gas and distributed to natural gas pipelines. The third stage is electricity production. The stored energy is used to produce electrical energy during the absence of wind or in conditions of a weak wind. Hydrogen is converted into electricity by a fuel cell. Interfacing is carried out using electrical components with the help of DC/DC converter with a step-up isolation transformer. The paper represents the structure of the proposed hydrogen-based energy buffer and reviews its main elements.