光伏发电并网系统在船舶电力系统中的应用研究

发布时间：2018-02-28 00:24

本文关键词： 光伏电池 MPPT QPR控制 LCL滤波器有源阻尼控制　出处：《大连海事大学》2016年硕士论文　论文类型：学位论文

【摘要】：由船舶运输而造成的环境污染越来越严重,在船舶电力系统中引入新能源是最有效地解决船舶污染的方法之一,所以本文对光伏发电并网系统在船舶电力系统中的应用做了探索性的研究。重点研究了如何提高光伏并网逆变器的抗干扰能力,在船舶电网电压幅值与频率突变时仍能够稳定并网。为了能够更准确地模拟光伏发电并网系统在船舶电力系统中的运行工况,首先建立了一个参数可调的光伏电池模型,并使用MPPT(Maximum Power Point Tracking)技术完成对光伏电池最大功率点的跟踪。设计了一个功率为2kW的单相光伏并网系统,利用电压前馈补偿的方法来抵消电网电压对系统的扰动,使用QPR(Quasi Proportional Resonant)控制策略代替传统的PI控制方法,解决了PI控制无法精确地跟踪正弦信号的缺点。为了扩大光伏并网系统在船舶电力系统中的应用范围,设计了一个12kW的三相光伏并网系统,利用QPR控制策略直接控制正弦电流信号,解决了传统PI控制需要经行dq坐标变换和解耦才能无误差地控制并网电流的缺点。使用LCL滤波器代替单电感滤波器,解决了单L滤波器只能通过增加电感值来减小电流谐波的缺点。研究了LCL滤波器的参数设计并利用有源阻尼的方法解决了LCL滤波器的谐振问题。利用坐标变换对光伏系统有用功率与无功功率进行解耦,实现对光伏并网系统有功功率和无功功率的独立控制。在Matlab仿真环境下搭建了一个基于本文研究策略的船舶光伏发电并网系统的完整仿真模型,并进行了仿真实验。仿真结果证明了本文控制策略的有效性。
[Abstract]:The environmental pollution caused by ship transportation is becoming more and more serious. It is one of the most effective methods to solve the pollution of ships by introducing new energy into the ship power system. So this paper makes an exploratory research on the application of photovoltaic grid-connected system in marine power system, and focuses on how to improve the anti-interference ability of photovoltaic grid-connected inverter. In order to more accurately simulate the operation conditions of photovoltaic grid-connected system in ship power system, a photovoltaic cell model with adjustable parameters is established. A single-phase photovoltaic grid-connected system with a power of 2kW is designed, and the voltage feedforward compensation method is used to counteract the disturbance caused by the grid voltage, and the maximum power point of the photovoltaic cell is tracked by MPPT(Maximum Power Point tracking technology, and a single-phase photovoltaic grid-connected system with 2kW power is designed. The traditional Pi control method is replaced by QPR(Quasi Proportional Resonant control strategy, which solves the shortcoming that Pi control can not track sinusoidal signal accurately. In order to expand the application range of photovoltaic grid-connected system in ship power system, A 12 kW three-phase photovoltaic grid-connected system is designed. The sinusoidal current signal is directly controlled by QPR control strategy. The shortcoming of traditional Pi control is solved, which requires the transformation and decoupling of DQ coordinates in order to control the grid-connected current without error. The single inductor filter is replaced by LCL filter. The drawback that single L filter can only reduce current harmonic by increasing inductance is solved. The parameter design of LCL filter is studied and the resonance problem of LCL filter is solved by the method of active damping. The coordinate transform pair is used to solve the resonance problem of LCL filter. The useful power and reactive power of photovoltaic system are decoupled. To realize the independent control of active power and reactive power of photovoltaic grid-connected system, a complete simulation model of ship photovoltaic grid-connected system based on the strategy of this paper is built in Matlab simulation environment. The simulation results show the effectiveness of the proposed control strategy.
【学位授予单位】：大连海事大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U665.1;TM615

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