本文選題：波浪能發(fā)電　切入點：直通物理分離型Z源逆變器　出處：《哈爾濱工業(yè)大學》2014年碩士論文

【摘要】：由于化石能源的過度使用，人類正面臨著化石能源危機和環(huán)境惡化的雙重壓力，迫切需要開發(fā)可再生清潔能源，海洋波浪能因清潔可再生、對環(huán)境影響小等優(yōu)點而倍受關注，波浪能發(fā)電成為研究熱點。本文以海洋波浪能發(fā)電控制系統(tǒng)為研究對象，重點研究擺式波浪發(fā)電智能并網(wǎng)逆變器。 首先，對6kW擺式波浪發(fā)電系統(tǒng)的組成裝置及運行特點進行分析，基于共振原理及能量轉(zhuǎn)換原理建立了擺式波浪發(fā)電機組的數(shù)學模型，主要包括波浪機模塊、永磁發(fā)電機模塊、傳動系統(tǒng)及控制系統(tǒng)等幾部分，并提出了變水室長度的控制策略，使系統(tǒng)實現(xiàn)了最大功率追蹤控制。 其次，針對傳統(tǒng)Z源逆變器存在的不足，提出一種新型Z源拓撲結構——直通物理分離型Z源逆變器（IST-ZSI），介紹了IST-ZSI的工作原理及相關參數(shù)設計，并對系統(tǒng)進行仿真研究，仿真結果表明IST-ZSI不僅能有效降低啟動沖擊電流和電容電壓應力，還將直通占空比的控制從物理結構上分離出來，實現(xiàn)升壓因子和調(diào)制因子的解耦控制，獲得較高的電壓傳輸比和良好的動態(tài)性能。 最后，，對擺式波浪發(fā)電系統(tǒng)進行并網(wǎng)研究，提出兩種并網(wǎng)方案：即IST-ZSI特有的雙閉環(huán)PI控制方案和直接電流下的單周控制并網(wǎng)方案。其中，雙閉環(huán)PI并網(wǎng)方案解決了傳統(tǒng)Z源逆變器只能通過間接測量阻抗網(wǎng)絡電容電壓的問題；單周控制的并網(wǎng)方案并網(wǎng)電流的諧波畸變率小，并網(wǎng)電流品質(zhì)高。兩種方案均表明直通物理分離型Z源并網(wǎng)逆變器啟動沖擊電流小、并網(wǎng)功率因數(shù)高、魯棒性強、動態(tài)性能穩(wěn)定，證明了兩種控制方案的可行性和有效性。
[Abstract]:Wave energy generation has become a research hotspot.In this paper, the marine wave power generation control system is studied, focusing on the pendulum wave generation intelligent grid-connected inverter.First of all, the composition and operation characteristics of 6kW tilting wave generation system are analyzed. Based on the principle of resonance and energy conversion, the mathematical model of tilting wave generator set is established, which mainly includes wave generator module and permanent magnet generator module.Some parts such as transmission system and control system are put forward, and the control strategy of the length of the variable water chamber is put forward, which makes the system realize the maximum power tracking control.Secondly, aiming at the shortcomings of the traditional Z-source inverter, a new Z-source topology structure, the direct-through physical separation Z-source inverter, is proposed. The working principle of IST-ZSI and the design of related parameters are introduced, and the simulation of the system is carried out.The simulation results show that IST-ZSI can not only effectively reduce the starting impulse current and capacitor voltage stress, but also separate the direct duty cycle from the physical structure, and realize the decoupling control of the boost factor and the modulation factor.High voltage transfer ratio and good dynamic performance are obtained.Finally, two grid-connected schemes are put forward, that is, the dual closed loop Pi control scheme of IST-ZSI and the one-cycle control scheme under direct current.Among them, the double closed loop Pi grid-connected scheme solves the problem that the traditional Z-source inverter can only indirectly measure the capacitance voltage of the impedance network, and the single-cycle control scheme has low harmonic distortion rate and high quality of grid-connected current.Both schemes show that the direct physical separation Z-source grid-connected inverter has low starting impulse current, high grid-connected power factor, strong robustness and stable dynamic performance, which proves the feasibility and effectiveness of the two control schemes.
【學位授予單位】：哈爾濱工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM612;P743.2

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