分布式發(fā)電并網(wǎng)孤島檢測(cè)技術(shù)研究
[Abstract]:As the cost of non-renewable energy continues to rise, society is aware of the importance of protecting the environment. Many countries have also begun to develop and promote the development and application of this technology on a large scale, replacing fossil fuels with renewable resources. Relatively speaking, the small-scale distributed power supply, as an effective supplement to the main power supply system, has played a lot of roles. Including promoting the role of society to environmental protection, economy, energy conservation, green direction development. Many researchers are keen on distributed power generation and grid-connected technologies. In many aspects, distributed power generation technology can realize the efficient utilization of resources and greatly reduce the investment of funds and the power consumption of the power grid. However, even if the main grid is powered off, the local load can also obtain electricity from the distributed power supply, which greatly increases the reliability and the corresponding security required for the operation of the power grid. However, there are advantages and disadvantages in everything. On the one hand, distributed power generation technology brings us rich returns, and there are many problems to be solved. First of all, the most important problem is how to change the distributed power supply from grid-connected state to island state. Therefore, for distributed generation grid-connected system, the exploration and research of island detection technology is of great significance. In this paper, we first introduce the concept and theory of island effect, then analyze its occurrence principle, analysis, discuss and study the condition of island occurrence, harm and the necessity of island detection. The index standard of islanding detection and the anti-islanding test circuit used in the experiment verification are listed in this paper. Based on the analysis, the principle of a variety of island detection methods is studied, and the blind areas of various detection methods are compared at the same time. The shortcomings and shortcomings of the current general island detection methods are compared and evaluated. There is usually one kind of active detection and one passive detection at home and abroad. The combination of the two methods is helpful to supplement their own shortcomings and shortcomings. In this paper, an improved sliding mode frequency offset method is proposed. A comparison process is added to the algorithm and a small disturbance is added to the algorithm. So that the phase of the load and the phase of the power network do not produce the opposite direction of the same size, and at the same time, the frequency change is further limited on the basis of the predecessors, so as to achieve the desired result. The simulation results of Matlab/Simulink show that this method is feasible and effective.
【學(xué)位授予單位】:沈陽工程學(xué)院
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2016
【分類號(hào)】:TM61
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