一种用于双馈风力发电机的新型统一电能质量调节器研究
发布时间：2018-07-28 21:00
【摘要】：随着风电大规模发展,风电装机容量占比逐步提高,其中技术成熟、成本较低的双馈机型占有较大市场份额。电网电能质量问题,尤其是电压跌落,将对双馈机组的运行造成较大影响,甚至脱网。这将成为电力系统安全稳定运行的较大隐患。为减小电压谐波、电压跌落与骤升、电压不平衡等电能质量问题对双馈电机(DFIG)风电系统的影响,本文提出一种应用于双馈风电系统的九开关型统一电能质量调节器(UPQC)方案。九开关变换器是背靠背变换器的演化结构,通过开关管的共用关系将原来的十二个开关管减少为九个。一定程度上减小了驱动电路、保护电路的复杂程度,提高了变换器的功率密度。通过合理的驱动脉冲调制方法,可以实现两个输出端口的独立控制。UPQC方案以电压补偿的方式实现DFIG柔性故障穿越,暂态性能优良,同时可对谐波电压和谐波电流进行治理,功能全面,设备利用率高。本文研究了九开关变换器由于共用开关元件而造成的制约关系,在此基础上设计两通道可以独立控制的调制方法;以九开关变换器为换流电路,确定含有双馈机组的UPQC拓扑结构;在对设备电压、电流补偿单元运算电路建模的基础上,给出相应的控制策略;按照电网工况,设定谐波电流补偿、轻度电压补偿、重度电压补偿三种工作模式,优化UPQC的运行方案;最后,通过仿真和试验验证了所提方案的可行性。文中为解决九开关变换器直流侧电压偏高的问题,提出了优先保障重要功能的动态电压调制比分配方案。该方案依据电网电压工况,动态分配用于电压补偿侧和电流补偿侧的调制比限幅,整体提高了直流侧电压利用率,仿真分析证明了该方法的有效性。最后的试验环节,包含关于九开关变换器驱动脉冲产生、死区配置、九开关IGBT驱动的研究,探究了九开关变换器在工程中应用的方法。研究结果表明九开关型UPQC可以有效治理电压、电流谐波,消除电压偏差与相位跳变,显著提高了DFIG机端电能质量,使机组可在多种故障电压工况下实现柔性故障穿越。
[Abstract]:With the large-scale development of wind power, the proportion of wind power installed capacity gradually increases, among which the doubly-fed models with mature technology and low cost occupy a large market share. Power quality problems, especially voltage sag, will have a great impact on the operation of doubly-fed generating units, and even de-grid. This will become a large hidden danger of the safe and stable operation of power system. In order to reduce the influence of voltage harmonic, voltage drop and sudden rise, voltage imbalance and other power quality problems on (DFIG) wind power system of doubly-fed wind turbine, this paper presents a nine-switch unified power quality regulator (UPQC) scheme applied to doubly-fed wind power system. The nine-switch converter is an evolutionary structure of the back-to-back converter, which reduces the original twelve switches to nine by the common relationship of the switching tubes. To a certain extent, the complexity of the drive circuit and the protection circuit are reduced, and the power density of the converter is increased. Through the reasonable method of driving pulse modulation, the independent control of two output ports. UPQC can realize the flexible fault traversing of DFIG by the way of voltage compensation, and the transient performance is good. At the same time, the harmonic voltage and harmonic current can be treated. The function is comprehensive, the equipment utilization rate is high. In this paper, we study the constraint relation caused by the common switching elements of the nine-switch converter, and design a modulation method which can be independently controlled by two channels. The topology of UPQC with doubly-fed unit is determined. On the basis of modeling the calculation circuit of voltage and current compensation unit of equipment, the corresponding control strategy is given, and the harmonic current compensation and light voltage compensation are set according to the grid condition. The operation scheme of UPQC is optimized by three working modes of heavy voltage compensation. Finally, the feasibility of the proposed scheme is verified by simulation and experiment. In order to solve the problem of high DC side voltage in nine-switch converters, a dynamic voltage modulation ratio allocation scheme is proposed, which gives priority to important functions. According to the voltage condition of the power network, the scheme dynamically allocates the modulation ratio limiting amplitude of the voltage compensation side and the current compensation side, and improves the DC side voltage utilization rate. The simulation results show that the method is effective. In the last part of the experiment, the research on the pulse generation, dead-time configuration and nine-switch IGBT drive of the nine-switch converter is discussed, and the application method of the nine-switch converter in engineering is discussed. The results show that nine-switch UPQC can effectively control voltage and current harmonics, eliminate voltage deviation and phase jump, improve the power quality of DFIG machine, and enable the unit to realize flexible fault traversing under a variety of fault voltage conditions.
【学位授予单位】：内蒙古工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM315
本文编号：2151560
[Abstract]:With the large-scale development of wind power, the proportion of wind power installed capacity gradually increases, among which the doubly-fed models with mature technology and low cost occupy a large market share. Power quality problems, especially voltage sag, will have a great impact on the operation of doubly-fed generating units, and even de-grid. This will become a large hidden danger of the safe and stable operation of power system. In order to reduce the influence of voltage harmonic, voltage drop and sudden rise, voltage imbalance and other power quality problems on (DFIG) wind power system of doubly-fed wind turbine, this paper presents a nine-switch unified power quality regulator (UPQC) scheme applied to doubly-fed wind power system. The nine-switch converter is an evolutionary structure of the back-to-back converter, which reduces the original twelve switches to nine by the common relationship of the switching tubes. To a certain extent, the complexity of the drive circuit and the protection circuit are reduced, and the power density of the converter is increased. Through the reasonable method of driving pulse modulation, the independent control of two output ports. UPQC can realize the flexible fault traversing of DFIG by the way of voltage compensation, and the transient performance is good. At the same time, the harmonic voltage and harmonic current can be treated. The function is comprehensive, the equipment utilization rate is high. In this paper, we study the constraint relation caused by the common switching elements of the nine-switch converter, and design a modulation method which can be independently controlled by two channels. The topology of UPQC with doubly-fed unit is determined. On the basis of modeling the calculation circuit of voltage and current compensation unit of equipment, the corresponding control strategy is given, and the harmonic current compensation and light voltage compensation are set according to the grid condition. The operation scheme of UPQC is optimized by three working modes of heavy voltage compensation. Finally, the feasibility of the proposed scheme is verified by simulation and experiment. In order to solve the problem of high DC side voltage in nine-switch converters, a dynamic voltage modulation ratio allocation scheme is proposed, which gives priority to important functions. According to the voltage condition of the power network, the scheme dynamically allocates the modulation ratio limiting amplitude of the voltage compensation side and the current compensation side, and improves the DC side voltage utilization rate. The simulation results show that the method is effective. In the last part of the experiment, the research on the pulse generation, dead-time configuration and nine-switch IGBT drive of the nine-switch converter is discussed, and the application method of the nine-switch converter in engineering is discussed. The results show that nine-switch UPQC can effectively control voltage and current harmonics, eliminate voltage deviation and phase jump, improve the power quality of DFIG machine, and enable the unit to realize flexible fault traversing under a variety of fault voltage conditions.
【学位授予单位】：内蒙古工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM315
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