【摘要】：隨著能源問題日益突出,發(fā)展新能源分布式發(fā)電成為解決人類可持續(xù)發(fā)展的必由之路,并網(wǎng)逆變器作為新能源實現(xiàn)并網(wǎng)發(fā)電的關(guān)鍵設(shè)備也越來越受到人們的重視。小容量的電力系統(tǒng)經(jīng)過高壓輸配電網(wǎng)絡(luò)幾級變壓和長距離輸電寄生了大量電網(wǎng)阻抗使之呈現(xiàn)弱電網(wǎng)特性。受弱電網(wǎng)變化電網(wǎng)阻抗的影響,逆變器存在穩(wěn)定性下降甚至失去穩(wěn)定的風(fēng)險。本文首先從頻域角度分析了弱電網(wǎng)下電網(wǎng)阻抗和并網(wǎng)點本地負載對并網(wǎng)逆變器的交互影響,得出了電網(wǎng)寄生電感是導(dǎo)致系統(tǒng)穩(wěn)定性下降的主要原因。在此基礎(chǔ)上明確了基于電網(wǎng)阻抗在線測量自適應(yīng)控制的基本思路,詳細分析了現(xiàn)有基于傳統(tǒng)傅里葉變換電網(wǎng)阻抗測量算法存在的問題,并對此提出了基于加窗傅里葉變換阻抗測量的新算法。其次分析了弱電網(wǎng)條件下電網(wǎng)阻抗的補償策略及其對系統(tǒng)被控對象頻率特性的影響,基于此提出系統(tǒng)PI和PR電流控制器參數(shù)整定方法及步驟。對比分析了PI與PR控制器在弱電網(wǎng)性能的優(yōu)劣,提出了基于PR控制器的自適應(yīng)控制策略。對自適應(yīng)控制算法進行了簡化并推導(dǎo)了控制器差分方程以便于數(shù)字控制器運行。再次詳細介紹了基于TMS320F28335單相光伏并網(wǎng)實驗平臺的結(jié)構(gòu)組成及軟硬件設(shè)計與實現(xiàn)。最后通過Matlab/Simulink軟件仿真和實驗驗證了本文主要的理論分析的正確性和所提算法的有效性。
[Abstract]:With the increasingly prominent energy problem, the development of new energy distributed generation has become the only way to solve the sustainable development of human beings. Grid-connected inverter, as the key equipment to realize grid-connected power generation, has been paid more and more attention. Small capacity power systems exhibit weak network characteristics through several stages of high voltage transmission and distribution networks and long distance transmission parasitic on a large number of network impedance. Under the influence of the grid impedance of the weak grid, the inverter has the risk of stability decline or even loss of stability. In this paper, the interaction of impedance and local load on grid-connected inverter is analyzed in frequency domain, and the parasitic inductance of power grid is the main reason that leads to the decline of system stability. On this basis, the basic idea of adaptive control based on on-line measurement of power network impedance is clarified, and the problems existing in the existing impedance measurement algorithms based on traditional Fourier transform are analyzed in detail. A new algorithm for impedance measurement based on windowed Fourier transform is proposed. Secondly, the compensation strategy of power network impedance and its influence on the frequency characteristics of the controlled system are analyzed. Based on this, a parameter tuning method and steps for Pi and PR current controllers are proposed. The performance of Pi and PR controllers in weak network is compared and analyzed, and an adaptive control strategy based on PR controller is proposed. The adaptive control algorithm is simplified and the differential equation of the controller is derived to facilitate the operation of the digital controller. The structure, hardware and software design and implementation of single phase photovoltaic grid-connected experimental platform based on TMS320F28335 are introduced in detail. Finally, the correctness of the main theoretical analysis and the validity of the proposed algorithm are verified by the simulation and experiment of Matlab/Simulink software.
【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM464;TM615

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相關(guān)期刊論文 前10條

1 付勛波;段江曼;趙棟利;許洪華;;逆變器并聯(lián)諧振及多重抑制方法研究[J];可再生能源;2017年01期

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本文編號：2161705