發(fā)布時間：2018-04-04 22:11

  本文選題：下垂控制　切入點：頻率修正模塊　出處：《西安理工大學》2017年碩士論文

【摘要】：微電網(wǎng)是一個微型發(fā)、配、用電系統(tǒng),由分布式電源、儲能系統(tǒng)、能量轉(zhuǎn)換裝置、負荷等組成。分布式電源具有分散性、不確定性、出力較小和靠近用電負荷等特點,使得微電網(wǎng)與傳統(tǒng)電網(wǎng)的系統(tǒng)結構差別較大,尤其在微電網(wǎng)處于孤島運行模式時表現(xiàn)更為明顯,此時傳統(tǒng)電網(wǎng)的潮流計算方法將不再適用于微電網(wǎng)。本文主要研究孤島微電網(wǎng)的穩(wěn)態(tài)模型和潮流計算方法,為孤島微電網(wǎng)的電壓和功率分布提供理論依據(jù)。首先將微電源從輸出功率的角度分為兩類:可控微電源和不可控微電源。對于可控微電源,如蓄電池、燃汽輪機等,將其看成松弛的PQ節(jié)點,采用下垂控制計及頻率的變化,根據(jù)每次迭代的電壓和頻率更新微電源的出力。對于不可控微電源,如風機、光伏等,在潮流計算中將其視為PQ節(jié)點,考慮到光強、風速等變化的隨機性,對其出力進行隨機模擬以得到它們的輸出功率。根據(jù)孤島微電網(wǎng)的實際情況,選用改進的牛拉法來進行潮流計算。此算法采用全節(jié)點的雅可比矩陣,不設置平衡節(jié)點,并通過在雅可比矩陣中引入有功和無功偏差對頻率偏差的偏導模塊來修正系統(tǒng)的頻率,再通過反復迭代求得系統(tǒng)的潮流解。針對三相系統(tǒng),本文采用序分量法進行三相潮流計算,其正序網(wǎng)絡采用改進的牛拉法進行潮流計算,負序和零序網(wǎng)絡均采用高斯法進行潮流計算。對于微電網(wǎng)的隨機性問題,本文在確定性潮流的基礎上引入隨機潮流,采用蒙特卡洛法對不可控微電源和隨機負荷的出力進行模擬,然后根據(jù)多次模擬的功率值分別進行多次潮流計算,最后通過對統(tǒng)計結果的分析,得到孤島微電網(wǎng)的電壓、頻率等參數(shù)的概率特征。采用MATLAB語言編寫了孤島微電網(wǎng)的三相隨機潮流計算程序,利用IEEE33節(jié)點算例驗證了基于下垂控制孤島微電網(wǎng)隨機潮流算法的正確性。
[Abstract]:Micro grid is a miniature, with power system, the distributed power, energy storage system, energy conversion device, load etc.. Distributed power is decentralized, uncertainty, and small output close to the power load characteristics, the difference between micro grid and traditional power grid system structure greatly, especially in the micro grid in island operation mode is more obvious, the trend of the traditional grid calculation method will no longer apply to micro grid. Calculation method of steady state model and the trend of this paper mainly studies the island micro grid, for voltage and power distribution and provide a theoretical basis for the island micro grid. The micro power output power from the point of view two: controllable micro power and controllable micro power. For the controllable micro power supply, such as batteries, gas turbine, as PQ node relaxation, the change of droop control and frequency meter, according to each iteration The output voltage and frequency of micro power generation update. The uncontrolled micro power supply, such as wind, photovoltaic, calculation, as the PQ node in the trend, considering the randomness of light intensity, wind speed changes, the output of random simulation to obtain their output power. According to the actual situation of the island micro grid selection, improved Niulafalai flow calculation. This algorithm uses the Jacobi matrix of all nodes, do not set the balance node, and by the Jacobi matrix is introduced in the active and reactive power deviation on the frequency deviation of the partial module to correct the frequency of the system, and then through the iterative algorithm to solve the system. For three-phase power flow solution system, this paper adopts sequence component method three phase power flow calculation, the positive sequence network using the improved Newton method for power flow calculation, negative and zero sequence network using Gauss method for power flow calculation. For the random micro grid The problem, based on the deterministic trend on the introduction of stochastic trend output by using Monte Carlo method of controllable micro power and random load is simulated, then according to the power of many simulation values were repeated power flow calculation, and finally through the statistical analysis of the results obtained, the voltage of isolated microgrid, the probability characteristic frequency parameters the use of MATLAB language. The island micro grid three-phase stochastic power flow calculation procedures, examples validate the droop control of isolated microgrid stochastic power flow algorithm based on IEEE33 using the node.

【學位授予單位】：西安理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TM744

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本文編號：1711910