微网中永磁直驱风力发电机组并网逆变器控制系统的研究
发布时间：2019-03-31 19:05
【摘要】：随着化石能源的日益减少与环境的污染问题日趋严重,可再生能源发电技术发展迅速。分布式发电技术凭借其清洁、能耗低、灵活控制等优点受到国际社会的广泛关注,但是分布式电源因为具有间歇性和不确定性,直接并网发电会对配电网的调控及整个电力系统的安全可靠运行产生重大的影响。微电网的提出能够整合集成多个分布式发电装置(Distributed Generation,DG),并根据电力系统的运行条件在孤岛模式下自愈运行,实践证明DG采用微电网形式并网运行或孤岛运行可以减轻高峰负载对电网的压力,并且提高了电能质量和可靠性。本文的研究对象为含有直驱式风力发电系统的微电网,对并网变流器的控制策略以及微电网并网运行和孤岛运行模式之间平滑切换的控制策略进行研究。首先建立了直驱式永磁同步风力发电系统的数学模型,包括风机、永磁同步发电机、机侧变流器、网侧变流器及其直流环节的模型,并且研究了风力机的桨距角控制、永磁同步发电机的控制、变流器的控制策略。其次,研究了永磁风力发电系统在并网和孤岛两种模式下平滑切换的下垂控制策略。为了能实现稳定的切换以并网逆变器为研究对象,分别提出了风电微网并网运行时基于下垂法的有功功率和无功功率解耦控制和孤岛运行模式下对线路压降进行补偿的改进下垂控制策略。该策略实现了系统在孤岛模式下随机切入负荷的均匀分配和稳定运行,以及并网模式下直流母线电压的稳定和风力发电机组最大功率的输出。同时设计了并网预同步控制器,以确保并网运行时不能对电网产生巨大的冲击电流。最后,采用Matlab/Simulink仿真平台搭建了包含直驱式风力发电系统的微网仿真模型,实现了应用改进的下垂控制策略的微网在孤岛模式与并网模式之间互相切换的仿真实验。结果表明改进的下垂控制能使微网在孤岛和并网两种模式下平滑的切换,系统运行稳定,证明了所提方法的正确性。
[Abstract]:With the decreasing of fossil energy and the serious pollution of environment, renewable energy generation technology is developing rapidly. Distributed power generation technology has been widely concerned by the international community for its advantages of cleanliness, low energy consumption and flexible control, but distributed power supply is intermittent and uncertain. Direct grid-connected generation will have a significant impact on the regulation of distribution network and the safe and reliable operation of the whole power system. The proposed microgrid can integrate and integrate multiple distributed generation units (Distributed Generation,DG) and operate in island mode according to the operating conditions of the power system. It has been proved that DG can reduce the pressure of peak load and improve the power quality and reliability by using microgrid operation or island operation. The research object of this paper is micro-grid with direct drive wind power generation system. The control strategy of grid-connected converter and smooth switching between grid-connected operation and island operation mode of micro-grid are studied in this paper. Firstly, the mathematical model of direct drive permanent magnet synchronous wind power generation system is established, including fan, permanent magnet synchronous generator, machine side converter, grid side converter and its DC link model, and the pitch angle control of wind turbine is studied. Permanent magnet synchronous generator control, converter control strategy. Secondly, the sag control strategy of permanent magnet wind power generation system under grid-connected mode and island-connected mode is studied. In order to achieve stable switching, grid-connected inverters are studied. An improved droop control strategy is proposed to compensate the line voltage drop when wind power micro-grid is connected to the grid based on the decoupling control of the active power and reactive power based on the droop method and the isolated island operation mode. The strategy realizes the uniform distribution and stable operation of the random cut-in load in island mode, the stability of DC bus voltage in grid-connected mode and the maximum power output of wind turbine. At the same time, the grid-connected pre-synchronous controller is designed to ensure that the grid-connected operation can not produce a huge impact current. Finally, the micro-grid simulation model including direct-drive wind power generation system is built by using Matlab/Simulink simulation platform, and the simulation experiment of switching between island mode and grid-connected mode is realized by using the improved droop control strategy. The results show that the improved droop control can make the micro-grid switch smoothly in the two modes of island and grid-connected mode, and the system is stable, which proves the correctness of the proposed method.
【学位授予单位】：东北农业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM464;TM315
本文编号：2451192
[Abstract]:With the decreasing of fossil energy and the serious pollution of environment, renewable energy generation technology is developing rapidly. Distributed power generation technology has been widely concerned by the international community for its advantages of cleanliness, low energy consumption and flexible control, but distributed power supply is intermittent and uncertain. Direct grid-connected generation will have a significant impact on the regulation of distribution network and the safe and reliable operation of the whole power system. The proposed microgrid can integrate and integrate multiple distributed generation units (Distributed Generation,DG) and operate in island mode according to the operating conditions of the power system. It has been proved that DG can reduce the pressure of peak load and improve the power quality and reliability by using microgrid operation or island operation. The research object of this paper is micro-grid with direct drive wind power generation system. The control strategy of grid-connected converter and smooth switching between grid-connected operation and island operation mode of micro-grid are studied in this paper. Firstly, the mathematical model of direct drive permanent magnet synchronous wind power generation system is established, including fan, permanent magnet synchronous generator, machine side converter, grid side converter and its DC link model, and the pitch angle control of wind turbine is studied. Permanent magnet synchronous generator control, converter control strategy. Secondly, the sag control strategy of permanent magnet wind power generation system under grid-connected mode and island-connected mode is studied. In order to achieve stable switching, grid-connected inverters are studied. An improved droop control strategy is proposed to compensate the line voltage drop when wind power micro-grid is connected to the grid based on the decoupling control of the active power and reactive power based on the droop method and the isolated island operation mode. The strategy realizes the uniform distribution and stable operation of the random cut-in load in island mode, the stability of DC bus voltage in grid-connected mode and the maximum power output of wind turbine. At the same time, the grid-connected pre-synchronous controller is designed to ensure that the grid-connected operation can not produce a huge impact current. Finally, the micro-grid simulation model including direct-drive wind power generation system is built by using Matlab/Simulink simulation platform, and the simulation experiment of switching between island mode and grid-connected mode is realized by using the improved droop control strategy. The results show that the improved droop control can make the micro-grid switch smoothly in the two modes of island and grid-connected mode, and the system is stable, which proves the correctness of the proposed method.
【学位授予单位】：东北农业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM464;TM315
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