本文選題：船舶電力系統(tǒng) + 并網(wǎng)逆變器��； 參考：《大連海事大學》2014年碩士論文

【摘要】：隨著傳統(tǒng)化石能源日漸枯竭、大氣污染以及氣候問題日益嚴重,開發(fā)利用可再生能源越來越受到重視。在此背景下,船舶應(yīng)用可再生清潔能源、實現(xiàn)并網(wǎng)發(fā)電,將成為船舶發(fā)展的新方向。新能源的發(fā)電并網(wǎng)需要并網(wǎng)逆變器,可是目前并網(wǎng)逆變器在船舶上的應(yīng)用還較少,因此研究船舶并網(wǎng)逆變器,尤其是對大型遠洋船舶而言,具有重要意義。船舶電力系統(tǒng)內(nèi)存在大量諧波,有限容量的船舶電網(wǎng)在負載沖擊下電壓及頻率不穩(wěn)定,為此,本文研究和設(shè)計了船舶并網(wǎng)逆變器控制策略。本文研究的主要內(nèi)容如下： 首先分析逆變器及濾波器不同拓撲結(jié)構(gòu)的優(yōu)缺點,根據(jù)船舶電力系統(tǒng)特點,確定逆變器及濾波器的拓撲結(jié)構(gòu),并構(gòu)建了其在兩相靜止坐標系下的數(shù)學模型。而后,在電流控制方面,闡述了LCL濾波器的電流諧振問題,分析并比較了有源阻尼抑制諧振法和無源阻尼抑制諧振法,提出一種逆變器側(cè)電感電壓前饋的方案；針對電網(wǎng)電壓頻率不穩(wěn)定、存在大量諧波的問題,提出采用電網(wǎng)電壓前饋方法及比例多諧振控制器,增強了系統(tǒng)的抗擾性。再次,在并網(wǎng)控制方面,采用恒功率方法實現(xiàn)并網(wǎng)運行,降低船舶電網(wǎng)中的無功含量；考慮到船舶電網(wǎng)電壓驟降的頻繁發(fā)生致使逆變器過載的問題,提出根據(jù)船舶電網(wǎng)電壓降落深度向電網(wǎng)注入無功功率的并網(wǎng)控制方法,實現(xiàn)逆變器穩(wěn)定運行,并向電網(wǎng)電壓提供了一定程度的支撐；采用基于二階廣義積分器的鎖相環(huán),并加入低通濾波器進行改進,實現(xiàn)在船舶電網(wǎng)不穩(wěn)定、存在諧波及三相電壓不平衡的情況下準確鎖相。 最后,根據(jù)上述所提的理論、方法,在Matlab/Simulink中搭建了船舶并網(wǎng)逆變器模型并進行仿真。仿真結(jié)果驗證了所提方法的有效性,為船舶并網(wǎng)逆變器的設(shè)計及控制提供了參考。
[Abstract]:With the depletion of traditional fossil energy, air pollution and climate problems, more and more attention has been paid to the development and utilization of renewable energy. In this context, the application of renewable clean energy and grid-connected power generation will become a new direction of ship development. Grid-connected inverters are needed for new energy generation, but the application of grid-connected inverters in ships is still few, so the study of grid-connected inverters, especially for large ocean-going vessels, is of great significance. There are a lot of harmonics in the ship power system, and the voltage and frequency of the ship power network with limited capacity are unstable under the load shock. Therefore, the control strategy of the ship grid-connected inverter is studied and designed in this paper. The main contents of this paper are as follows: Firstly, the advantages and disadvantages of different topologies of inverter and filter are analyzed. According to the characteristics of marine power system, the topology of inverter and filter is determined, and its mathematical model in two-phase stationary coordinate system is constructed. Then, in the aspect of current control, the current resonance problem of LCL filter is expounded, the active damping suppression resonance method and the passive damping suppression resonance method are analyzed and compared, and a scheme of inverter side inductance voltage feedforward is proposed. In order to solve the problem of unstable voltage frequency and a large number of harmonics, a voltage feedforward method and a proportional multi-resonance controller are proposed to enhance the immunity of the system. Thirdly, in the aspect of grid-connected control, the method of constant power is adopted to realize grid-connected operation to reduce the reactive power content in ship power grid. A grid-connected control method of injecting reactive power into the power grid according to the voltage drop depth of ship power grid is proposed to realize the stable operation of the inverter and to provide a certain degree of support to the grid voltage, and the phase-locked loop based on the second-order generalized integrator is adopted. The low pass filter is added to improve the phase locking in the case of ship power network instability, harmonic and three-phase voltage imbalance. Finally, according to the above theory and method, the ship grid-connected inverter model in Matlab/Simulink is built and simulated. The simulation results verify the effectiveness of the proposed method and provide a reference for the design and control of ship grid-connected inverter.
【學位授予單位】：大連海事大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM464

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