電網(wǎng)生存性評(píng)估及擾動(dòng)源定位方法研究
[Abstract]:As an important infrastructure to ensure modern social and economic development and security and stability, the security of power grid has been highly concerned. In recent years, blackouts have revealed the inherent security risks of power grid itself, extreme natural disasters have exposed the vulnerability of power grid in dealing with harsh external environment, and the power grid is deliberately. The survivability of power grid in the environment of "internal and external troubles" is worth pondering. Many achievements have been made in the existing theory of power grid survivability assessment or vulnerability assessment, but there are still some imperfections, such as simply considering the vulnerability of power grid from the perspective of grid structure and ignoring electricity. The influence of network operation modes lacks in-depth analysis and evaluation of the interconnection between the equilibrium and vulnerability of power grid structure, and seldom makes a comprehensive evaluation of the survivability of power grid under normal operation mode and disturbance state from the angle of combining internal and external factors. This paper studies the existing and potential survival problems of power grid under normal operation mode and disturbance state, establishes the evaluation index system of power grid survivability and the method of locating disturbance sources. The main achievements of the work are summarized as follows:
A power transmission path analysis method based on power flow tracing method is proposed, which can analyze the deep characteristics of power flow through the surface of power flow and get all the power transmission paths between the "generator-load" nodes in the whole network. The electric distance is defined based on the power transmission path analysis to overcome the dependence on the network node only. Defects of the method of defining electrical distance can reflect the characteristics of power transmission more comprehensively. On this basis, the index and method for evaluating the smoothness of power transmission efficiency are constructed, and the important components that play a pivotal role in power transmission are identified.
Considering the influence of the spatial distribution characteristics of the key nodes and branches on the vulnerability of the power grid, a vulnerability assessment index and method considering the multi-source disturbances and the balancing characteristics of the power grid structure are proposed. The structural equalization index defines the spatial distance between nodes and branches, and puts forward the spatial distribution equalization of key nodes and the spatial distribution equalization of key branches. The vulnerability of the power grid under 2 modes of random failure and intentional attack is analyzed.
The index system and evaluation method of power grid survivability evaluation considering the unblocked, balanced and vulnerable of power grid are established. A hierarchical optimization method of survivability index weight based on AHP and improved grey relational degree method is proposed to synthesize all the indexes of power grid survivability into an organic whole.
A method of power network planning scheme based on power grid survivability assessment is proposed. Four planning schemes are constructed based on a typical practical power grid example. The survivability indices of each planning scheme are calculated and the survivability level of each planning scheme is obtained. The contradiction proves that it is necessary to consider the unimpeded and vulnerable of the grid survivability system.
Aiming at the typical failure scenarios of two kinds of components threatening the viability of power grid, the corresponding accurate locating methods of disturbance sources are proposed respectively. Aiming at the problems of selectivity and insufficient speed of traditional generator overvoltage protection under the scenario of generator parallel operation, the identification strategy of overvoltage source under the scenario of generator parallel operation is proposed. The fault generator can be quickly removed when the excitation system of the generator fails, and the voltage regulation function of the generator AVR can be brought into full play under the external factors such as system load rejection to ensure the recovery of the system voltage level. Sample rate can significantly reduce the maximum fault location error and increase the probability of high-precision fault location results at high sampling rate. The proposed two disturbance source location methods can provide an important guarantee for the survivability of the grid in response to component failure scenarios.
【學(xué)位授予單位】:華中科技大學(xué)
【學(xué)位級(jí)別】:博士
【學(xué)位授予年份】:2014
【分類號(hào)】:TM732
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