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Dynamic Voltage Restorer(DVR)is the primary means to solve dynamic voltage problem, has been gotten extensive attention by domestic and international power engineering researchers. In this paper the DVR main structure, working principle and applications are summarized and compared, then the principle and the advantages and disadvantages of a variety of commonly used detection methods are analyzed,...
Wind power is a special electric power, because of the volatility of the wind, making voltage stability becoming an important research problem which wind power system is facing with. Therefore, I analyzed the relevant current research and the main problems about wind power system domestic and foreign, expounding the difference of voltage stability between the conventional energy sources and the wind...
Completing the design for the model of photovoltaic array and achieving to track the array's maximum power point by the help of Incremental Conductance Method. This article firstly introduces a practical model of photovoltaic cells, by which the photovoltaic array`s model is obtained. To achieve the maximum power point tracking the Incremental Conductance method is used. Finally, with the help of...
A further research on Grid-connected photovoltaic system was made in this paper. The author made a design for the control of single-phase two-level photovoltaic power generation system based on Repetitive control. In order to achieve a precise control to the Grid-current, the maximum power point tracking and the Grid-connected Inverter`s control were realized respectively. Finally, the whole design...
Regarding different operating conditions under different wind speed in Variable-Speed Constant-Frequency Wind Energy Generation using Doubly-Fed Induction Generator, the ADRC methods as applied to Grid-Connected, Maximal Power Point Tracking and Constant Power Output are presented. Finally, ADRC was prospected in the Variable-Speed Constant-Frequency Wind Energy Generation with Doubly-Fed Induction...
This paper puts forward the background of the CRC arithmetic by which it means how important the arithmetic can be in the field of the communication, tells us the principles of CRC arithmetic, introduces a kind of common ways about how to make the code and how to decode of the CRC arithmetic, uses a lot of words to introduce how the CRC codes be made through one kind of the CRC arithmetic which is...
The stability of wind power systems is becoming a hot research with the expansion of the total installed capacity of wind power; wind speed model is of great significance in dynamic stability analysis of wind power systems. In this paper, taking into account the random and uncontrollable nature of wind speed variations, wind speed model research status at home and abroad is summarized from different...
Photovoltaic (PV) system is composed of several elements as solar array, boost converter, inverter and load. The solar array should be integrated with a dc-dc converter and a control algorithm to perform a search to track the maximum power continuously. We adopt perturbation and observation method to implement Maximum Power Point Tracking (MPPT) for solar cells. Owing to the existence of converters,...
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