逆變型DG和異步DG對(duì)配電網(wǎng)過(guò)流保護(hù)的影響及應(yīng)對(duì)策略
[Abstract]:With the rapid development of its unique economic and environmental benefits, distributed generation has brought great challenges to the operation of distribution network, in which the distribution network protection problem is especially serious. With the increase of the permeability of distributed generation in distribution network, in order to maintain the stability of power system, distributed generation is required to have low voltage traversing capability. The protection problem has become a difficult problem for the distribution network under the distributed generation access. At present, the distribution network is generally equipped with three-segment current protection, so it is of great significance to study the impact of distributed generation on the distribution network current protection and countermeasures. In this paper, the influence of distributed generation on distribution network protection mainly depends on its own capacity and the principle of the electrical interface connected to the distribution network. The distributed generation type is divided into inverter DG, asynchronous DG, synchronous DG, permanent magnet synchronous DG, and the characteristics of output current of inverter DG and asynchronous DG in low voltage traversing and their influence on distribution network current protection are studied. The fault current of DG is limited by adjusting itself to reduce or even avoid its adverse effect on distribution network protection. The output current of inverter DG is mainly related to its control strategy. Based on the research status of inverter model, a widely accepted modeling method is proposed in this paper. Starting from mathematical model, low voltage traversing strategy, current limiting protection control and so on, reasonable simulation model parameters are selected to build inverter DG model. Based on the observation of the variation of the output current during the fault of the power network, a strategy to dynamically adjust the reference current of the inverter current limiting protection based on the parallel dot voltage is put forward. The effectiveness of the proposed scheme is verified by theoretical calculation and simulation experiments. Asynchronous DG is divided into single feed asynchronous DG, doubly-fed asynchronous DG. Firstly, the variation of output current of single-fed asynchronous DG during power network fault is analyzed from two aspects of theoretical calculation and simulation results, based on the principle that rotor time constant is related to rotor external resistance. A strategy for modifying the external resistance of a single feed asynchronous DG rotor is proposed. Then, based on the single-fed asynchronous DG, the crowbar resistance and output current of doubly-fed asynchronous DG are analyzed theoretically. The theoretical calculation and simulation results show that the doubly-fed asynchronous DG has no effect on the current protection of distribution network. The proposed strategy is based on a clear theory and clear physical concept, which provides a feasible solution to the distribution network protection problem under distributed generation access.
【學(xué)位授予單位】:山東大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:TM61;TM773
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