From the principles of electrical engineering it is known that the 3-phase
quantities of the 3-phase AC machines can be summarized to complex
vectors. These vectors can be represented in Cartesian coordinate systems,
which are particularly chosen to suitable render the physical relations of
the machines. These are the field-orientated coordinate system for the 3-
phase AC drive technology or the grid voltage orientated coordinate
system for generator systems.
This book covers the recent development and progress of the wind energy conversion system. The chapters are contributed by prominent researchers in the field of wind energy and cover grid integration issues, modern control theories applied in wind energy conversion system, and dynamic and transient stability studies.
The term “ smart grid” defi nes a self - healing network equipped with dynamic optimization
techniques that use real - time measurements to minimize network losses, maintain
voltage levels, increase reliability, and improve asset management. The operational data
collected by the smart grid and its sub - systems will allow system operators to rapidly
identify the best strategy to secure against attacks, vulnerability, and so on, caused by
There is an upward trend that human activities involve more electric power nowadays
and for years to come. And we will soon be facing shortage of electricity supply if we
rely solely on non-renewable power generation from fossil fuels such as coals.
Renewable energy generation has proven effective in meeting the demand.
This thesis starts with a general introduction to power-line communication. Then an existing application, communicating on a low-voltage grid, is investigated in order to obtain some knowledge of how the power line acts as a communication channel. Mời các bạn cùng tìm hiểu để nắm bắt nội dung thông tin tài liệu.
In practice, consumption devices are not only resistive but also reactive and this reactance varies with time. Therefore, grid voltage is not stable and coefficients always change in spite of using Automatic Reactive Power Regulator. To regulate voltage and cosφ in an expected range, it is necessary to change the parameters of regulators as the loads change.
For most of the time, electric energy supply was based on large centralized power stations, the biggest of them located close to coal mines. Electricity distribution traditionally is done by means of high voltage power lines feeding the electricity distribution grid. With time, electric utilities became large enterprises integrating electricity generation, distribution, and customer relations. Electricity generation mainly is powered by heat engines, their efﬁciency being determined by the temperature difference of the work ﬂuid.