【摘要】：針對分布式新能源接入電力配電網(wǎng)帶來的配電網(wǎng)保護(hù)及饋線自動化問題，分析逆變型分布式電源的并網(wǎng)特性以及當(dāng)配網(wǎng)故障時逆變器的輸出特性，，提出一種適用于含分布式電源配網(wǎng)故障分析的等效模型。以一種已被廣泛使用的逆變器為例，根據(jù)其已知參數(shù)，通過計算，得出逆變器的等效輸出阻抗，再結(jié)合故障后逆變器內(nèi)部保護(hù)的定值以及動作時限，最終將這些參數(shù)計入到已建立的模型中。 分析了含分布式電源配電網(wǎng)的短路故障特征量，總結(jié)出分布式電源接入不同的位置對保護(hù)造成影響的差異。并在此基礎(chǔ)上提出了考慮配電網(wǎng)保護(hù)的分布式電源選址與定容，即在考慮保護(hù)動作以及配電網(wǎng)有功網(wǎng)損的情況下，利用改進(jìn)的粒子群算法，對含分布式電源配電網(wǎng)進(jìn)行規(guī)劃，確定分布式電源的接入位置和容量。 在已有研究成果的基礎(chǔ)上，進(jìn)行含分布式電源配電網(wǎng)故障計算。根據(jù)本文提出的算法，對分布式電源進(jìn)行選址定容，繼而得到用于故障計算的含分布式電源的配電網(wǎng)。將逆變器的等效阻抗以及控制策略作為建立分布式電源等效模型的重要條件，在故障計算過程中，逆變器的控制策略以及故障輸出特性將成為主要的約束條件。通過編程計算，得出不同故障下含分布式電源配電網(wǎng)各節(jié)點(diǎn)、支路的電氣量。 本文在盡量不大幅度改變原有的繼電保護(hù)及自動重合閘配置的前提下，通過定值及動作時限的調(diào)整來實(shí)現(xiàn)繼電保護(hù)裝置在分布式電源接入配電網(wǎng)后仍然能夠可靠靈敏的動作。分析含分布式電源配電網(wǎng)故障計算的結(jié)果，與未接入DG配電網(wǎng)的故障計算結(jié)果作對比，總結(jié)出含逆變型DG配電網(wǎng)的保護(hù)配置方案。最后，歸納提出了逆變型DG“T”接于10kV配網(wǎng)時，配電網(wǎng)保護(hù)配置的研究方法及步驟。
[Abstract]:Aiming at the problems of distribution network protection and feeder automation caused by distributed new energy access to power distribution network, this paper analyzes the grid-connected characteristics of inverter distributed generation and the output characteristics of inverter in the event of distribution network failure. An equivalent model for fault analysis of distribution networks with distributed power supply is proposed. Taking a widely used inverter as an example, according to its known parameters, the equivalent output impedance of the inverter is obtained by calculation, and combined with the fixed value of the internal protection of the inverter after the fault and the operating time limit. Finally, these parameters are counted into the established model. In this paper, the characteristics of short-circuit fault in distribution network with distributed power are analyzed, and the difference of influence on protection caused by different location of distributed power supply is summarized. On the basis of this, the location and capacity of distributed power supply considering the protection of distribution network is put forward, that is, under the condition of considering the protection action and the active power network loss of distribution network, the improved particle swarm optimization algorithm is used to plan the distribution network with distributed generation. Determine the access position and capacity of the distributed power source. Based on the existing research results, the fault calculation of distribution network with distributed generation is carried out. According to the algorithm proposed in this paper, the location of distributed power supply is fixed, and then the distribution network with distributed generation for fault calculation is obtained. The equivalent impedance and control strategy of the inverter are taken as the important conditions for establishing the equivalent model of distributed power supply. In the process of fault calculation, the control strategy and the fault output characteristics of the inverter will be the main constraints. Through programming calculation, the electrical quantities of each node and branch of distribution network with distributed power supply under different faults are obtained. On the premise that the original relay protection and automatic reclosing configuration are not changed as much as possible, the relay protection device can still operate reliably and sensitively after the distributed power supply is connected to the distribution network by adjusting the fixed value and the action time limit. The fault calculation results of distribution network with distributed generation are analyzed and compared with those of distribution network not connected to DG. The protection configuration scheme of distribution network with inverter type DG is summarized. Finally, the research methods and steps of distribution network protection configuration when inverter DG "T" is connected to 10kV distribution network are summarized.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM77

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