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Large-scale wind power centralized integration is the major way of wind energy utilization in China. With the increasing scale of wind power integration, voltage security and active power loss of wind farms can't be ignored, thus it is essential to realize economical operation inside wind farms in security. Considering the typical radial feeder network inside wind farms, this paper introduce the DistFlow...
In this paper, a compact low-cost electronically beam-scanning smart antenna that covers the frequency band from 2.45 GHz to 2.55 GHz is proposed. The driven element is a directional antenna composed of three Inverted F-type Antenna (IFA) elements. In addition to the driven element, there are twelve IFA parasitic elements arranged around the driven element and loaded with varactors. By tuning the...
In this paper, a frequency agile small smart antenna composed of a compact Electronically Steerable Passive Array Radiator (ESPAR) antenna is presented. The frequency agile range from 2.3GHz to 2.6GHz is examined in terms of return loss, antenna gain and radiation pattern. Proposed frequency agile smart antenna is electrically small in size. Tightly coupled top-disk loaded monopole and folded monopoles...
A back-to-back PWM converter is used as the excitation power supply for the doubly-fed induction generator (DFIG) wind power generation of variable speed constant frequency (VSCF). The mathematical model and control strategy of converter which is connected between rotor and grid is analyzed. Grid-side converter adopts grid voltage oriented control scheme for achieving the stability of DC-link voltage,...
The purpose of this research is to optimize control and enhance performance for a variable speed constant frequency (VSCF) doubly-fed induction generator (DFIG) wind turbine generation system by using fuzzy logic controller. The control of the rotor-side converter is realized by stator flux oriented control and the fuzzy controller performs robust speed control. The control of the grid-side converter...
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