船舶并网逆变器控制策略的研究

发布时间：2018-05-14 05:29

本文选题：船舶电力系统 + 并网逆变器　；参考：《大连海事大学》2014年硕士论文

【摘要】：随着传统化石能源日渐枯竭、大气污染以及气候问题日益严重,开发利用可再生能源越来越受到重视。在此背景下,船舶应用可再生清洁能源、实现并网发电,将成为船舶发展的新方向。新能源的发电并网需要并网逆变器,可是目前并网逆变器在船舶上的应用还较少,因此研究船舶并网逆变器,尤其是对大型远洋船舶而言,具有重要意义。船舶电力系统内存在大量谐波,有限容量的船舶电网在负载冲击下电压及频率不稳定,为此,本文研究和设计了船舶并网逆变器控制策略。本文研究的主要内容如下：首先分析逆变器及滤波器不同拓扑结构的优缺点,根据船舶电力系统特点,确定逆变器及滤波器的拓扑结构,并构建了其在两相静止坐标系下的数学模型。而后,在电流控制方面,阐述了LCL滤波器的电流谐振问题,分析并比较了有源阻尼抑制谐振法和无源阻尼抑制谐振法,提出一种逆变器侧电感电压前馈的方案；针对电网电压频率不稳定、存在大量谐波的问题,提出采用电网电压前馈方法及比例多谐振控制器,增强了系统的抗扰性。再次,在并网控制方面,采用恒功率方法实现并网运行,降低船舶电网中的无功含量；考虑到船舶电网电压骤降的频繁发生致使逆变器过载的问题,提出根据船舶电网电压降落深度向电网注入无功功率的并网控制方法,实现逆变器稳定运行,并向电网电压提供了一定程度的支撑；采用基于二阶广义积分器的锁相环,并加入低通滤波器进行改进,实现在船舶电网不稳定、存在谐波及三相电压不平衡的情况下准确锁相。最后,根据上述所提的理论、方法,在Matlab/Simulink中搭建了船舶并网逆变器模型并进行仿真。仿真结果验证了所提方法的有效性,为船舶并网逆变器的设计及控制提供了参考。
[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.
【学位授予单位】：大连海事大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM464

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