基于电压源输出的分布式发电系统中DFIG风电机组运行控制技术

发布时间：2018-02-23 13:37

  本文关键词： 分布式发电系统 双馈异步风力发电机 电压源 下垂 多模式运行　出处：《浙江大学》2014年硕士论文　论文类型：学位论文

【摘要】：随着新能源发电技术研究的广泛开展,基于电流源输出的双馈(DFIG)风电机组并网运行控制已得到深入的研究和应用。但在分布式发电技术逐渐兴起的局面下,需要依托较为稳定的公共电网存在的DFIG风电机组电流源控制技术将极大的限制其在分布式发电系统中配置。 为实现分布式发电系统中DFIG风电机组灵活有效的介入,首先,通过将间接定子磁链定向(ISFO)控制策略应用于DFIG机侧变流器,建立了其电压源输出特性,配合设计的风力机桨距角控制算法,满足了其孤岛单机运行需要。其次,考虑到分布式系统一般由多单元并联构成,引入下垂控制构建了DFIG与其他分布式发电单元协同时的功率分配机制,为其提供了参与分布式发电系统孤岛并联运行的渠道。同时,为检验ISFO与下垂控制算法的协调能力,建立了DFIG电气部分的小扰动数学模型,分析了关键控制参数对DFIG控制系统的影响,为风电机组运行的稳定性提供了必要的判据。再则,为满足分布式发电系统并网运行和工作模式无缝切换的需要,参照电力系统二次调节方式,分别基于公共节点电压频率、电压幅值反馈和发电单元输出功率反馈建立了分布式发电系统孤岛运行工作点和并网运行输出功率的调节机制,使得DFIG能在硬件拓扑结构和控制算法保持连贯的情况下参与分布式发电系统正常运行。以此为基础,提出了基于电压源控制的DFIG并网MPPT运行控制算法,以尽量提高系统风能利用效率。 为应对不平衡的运行条件,提出了改进的ISFO控制,以满足DFIG孤岛单机运行带不平衡本地负荷的需要。而针对含DFIG风电机组分布式发电系统多机孤岛并联运行的不平衡工况,以实现负序电流的合理分配和系统公共节点电压不平衡度的降低为目的,通过负序下垂引入虚拟电导,改善了系统负序回路阻抗特性,最终达成控制目标的实现。 针对分布式发电系统中DFIG风电机组运行控制技术的相关理论研究,基于MATLAB/Simulink仿真软件,搭建了DFIG由单机到系统的仿真模型,验明了所提系列控制算法在与之对应的运行工况或平衡、不平衡条件下的适应能力。最后通过建立DFIG风电机组硬件实验平台,协同中央控制器和储能硬件实验平台验证了部分工况下所提DFIG控制算法的实际可行性,为相关工作的继续开展奠定了较为良好的基础。
[Abstract]:With the development of new energy generation technology, the grid-connected operation control of DFIGG wind turbine based on current source output has been deeply studied and applied. The current source control technology of DFIG wind turbine which depends on the stable public power grid will greatly restrict its configuration in the distributed generation system. In order to realize the flexible and effective intervention of DFIG wind turbine in distributed generation system, the output characteristics of the voltage source are established by applying the indirect stator flux oriented DFIG control strategy to the DFIG converter. The distance angle control algorithm of wind turbine is designed to meet the need of isolated island single machine operation. Secondly, considering that the distributed system is generally composed of multi-unit parallel connection, The droop control is introduced to construct the power allocation mechanism of DFIG in collaboration with other distributed generation units, which provides a channel to participate in the parallel operation of isolated islands of distributed generation system. At the same time, the coordination ability of ISFO and droop control algorithm is tested. The small disturbance mathematical model of DFIG electrical part is established, and the influence of key control parameters on DFIG control system is analyzed, which provides the necessary criterion for the stability of wind turbine. In order to meet the needs of grid-connected operation and seamless switching of working mode in distributed generation system, the common node voltage frequency is based on the secondary regulation mode of power system, respectively. Voltage amplitude-feedback and output power feedback of generating unit establish the control mechanism of isolated operation point and grid-connected output power of distributed generation system. The DFIG can participate in the normal operation of the distributed generation system under the condition that the hardware topology and the control algorithm remain consistent. Based on this, a novel MPPT operation control algorithm based on voltage source control for DFIG connected to the grid is proposed. In order to improve the system wind energy efficiency. In order to deal with the unbalanced operation conditions, an improved ISFO control is proposed to meet the needs of DFIG isolated island single machine operation with unbalanced local load. In order to realize the reasonable distribution of negative sequence current and the reduction of voltage imbalance degree of common node, the virtual conductance is introduced into the negative sequence droop, which improves the impedance characteristic of the negative sequence loop of the system, and finally achieves the control goal. Aiming at the related theory research of DFIG wind turbine operation control technology in distributed generation system, the simulation model of DFIG from single machine to system is built based on MATLAB/Simulink simulation software. The adaptability of the proposed series of control algorithms under the corresponding operating conditions, balance and unbalance is verified. Finally, the hardware experimental platform of DFIG wind turbine is established. The practical feasibility of the proposed DFIG control algorithm is verified by cooperating with the central controller and the experimental platform of energy storage hardware, which lays a good foundation for the related work to continue.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM61

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