本文選題：節(jié)點電壓法　切入點：不動點非膨脹算法　出處：《廣西大學》2017年碩士論文　論文類型：學位論文

【摘要】：隨著現(xiàn)代電網(wǎng)的不斷發(fā)展,特別是智能電網(wǎng)的提出,使得配電網(wǎng)的重要性越來越突出。對于發(fā)電和輸電而言,配電網(wǎng)絡(luò)是保障供電可靠性、安全性的最主要環(huán)節(jié),也是落實智能電網(wǎng)的核心環(huán)節(jié)。由于電力電子元件在配網(wǎng)中的應用、元件參數(shù)的不對稱、用電負荷的多樣性所造成的三相負荷不對稱、分布式電源的接入及系統(tǒng)運行條件改變所引起的不對稱等,以上這些因素使得配電網(wǎng)的不平衡問題越來越突出。與三相對稱系統(tǒng)相比較,三相不對稱配電網(wǎng)絡(luò)分析須進一步解決的核心問題是,三相負荷不對稱、三相線路參數(shù)不對稱問題和配電網(wǎng)絡(luò)PQ負荷的潮流迭代算法問題。為解決線路參數(shù)不對稱問題,本文將三相互感耦合及參數(shù)不對稱的線路進行去互感處理,將線路等值為三相網(wǎng)形電路,使三相不對稱網(wǎng)絡(luò)分析計算可延續(xù)較成熟的對稱電路分析的節(jié)點電壓法。相分量模型能夠反映系統(tǒng)實際運行的物理特性,能夠簡明、直觀、準確地描述配電網(wǎng)的運行狀況,對配電網(wǎng)進行計算與分析不需要像對稱分量法那樣嚴格的條件限制。其次,針對配電網(wǎng)絡(luò)中重PQ負荷點、缺少PV節(jié)點的電壓支撐的具體特點,提出了一種不動點非膨脹迭代算法,該算法采用節(jié)點負荷等值導納逐次逼近的方式可較好解決PQ負荷點多的輻射梳狀配電網(wǎng)高精度潮流的快速迭代問題,并從求解非線性方程組數(shù)學角度對本文算法的非膨脹特性進行數(shù)學論證,最后采用IEEE33節(jié)點、IEEE IEEE123節(jié)點配電系統(tǒng)進行仿真,其仿真結(jié)果也驗證了算法的超線性收斂、非膨脹特性理論分析的正確性及算法在配電網(wǎng)潮流計算中的可行性。隨著能源危機和環(huán)境問題的加劇,新能源越來越受到重視,與之相對應的分布式發(fā)電技術(shù)成為未來配電網(wǎng)的發(fā)展趨勢。隨著社會經(jīng)濟的發(fā)展,傳統(tǒng)的集中式供電模式的缺陷越來越突出,已無法滿足當前電力供應的需求。分布式電源的接入給傳統(tǒng)配電網(wǎng)注入活力,但同時也對配電網(wǎng)提出了新的挑戰(zhàn)。分布式電源的接入改變了配電網(wǎng)原有的結(jié)構(gòu)和運行方式。傳統(tǒng)的配電網(wǎng)潮流計算方法已經(jīng)無法滿足含分布式電源的配電網(wǎng)潮流計算。本文對接入配電網(wǎng)的分布式電源模型進行研究,將提出的不動點非膨脹潮流算法推廣到含分布式電源的配電網(wǎng)潮流計算。對IEEE33節(jié)點的弱環(huán)配電網(wǎng)絡(luò)網(wǎng)絡(luò)及輻射狀網(wǎng)絡(luò)進行仿真,其仿真結(jié)果驗證本文算法在含分布式電源配電網(wǎng)絡(luò)潮流計算中的適用性
[Abstract]:With the continuous development of modern power grid, especially the proposal of smart grid, the importance of distribution network is more and more prominent. For power generation and transmission, distribution network is the most important link to ensure the reliability and security of power supply. Because of the application of power electronic components in distribution network, the asymmetry of component parameters and the diversity of power load, the three-phase load is asymmetric. The imbalance problem of distribution network becomes more and more serious because of the asymmetry caused by the access of distributed generation and the change of system operating conditions, which is compared with the three-phase symmetric system. The key problems to be solved in the analysis of three-phase asymmetrical distribution network are three-phase load asymmetry, three-phase line parameter asymmetry and power flow iterative algorithm for distribution network PQ load. In this paper, the circuit with three-phase mutual inductance coupling and parameter asymmetry is treated with de-inductance, and the circuit is equivalent to three-phase network circuit. The phase component model can reflect the physical characteristics of the actual operation of the system, and it can describe the distribution network operation state succinctly, intuitively and accurately. The calculation and analysis of distribution network need not be as strict as the symmetrical component method. Secondly, considering the specific characteristics of heavy PQ load point in distribution network, the voltage support of PV node is lacking. In this paper, a fixed point nonexpansive iterative algorithm is proposed. The fast iterative problem of high precision power flow in the radiation comb distribution network with multiple PQ load points can be solved by the successive approximation of nodal load equivalent admittance. The non-expansion characteristic of the algorithm is proved from the point of view of solving the nonlinear equations. Finally, the IEEE33 node / IEEEIEEE-based distribution system is simulated. The simulation results also verify the superlinear convergence of the algorithm. The correctness of the theoretical analysis of non-expansion characteristics and the feasibility of the algorithm in power flow calculation of distribution network. With the intensification of energy crisis and environmental problems, more and more attention has been paid to new energy. With the development of society and economy, the defects of traditional centralized power supply mode become more and more serious. Can no longer meet the current demand for power supply. Access to distributed power supply reinvigorates the traditional distribution network. But it also poses a new challenge to the distribution network. The access of distributed generation has changed the original structure and operation mode of the distribution network. The traditional power flow calculation method of distribution network can no longer meet the tide of distribution network with distributed generation. In this paper, the distributed power generation model connected to the distribution network is studied. The proposed fixed point non-expansion power flow algorithm is extended to the power flow calculation of distribution network with distributed power supply. The weak loop distribution network and radiation network of IEEE33 node are simulated. The simulation results verify the applicability of the proposed algorithm in the power flow calculation of distribution networks with distributed power sources.
【學位授予單位】：廣西大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TM744

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