新型电能质量调节与故障限流复合系统控制策略及风场应用
发布时间：2018-11-14 17:09
【摘要】：随着电力负荷增长,电网短路水平不断提高,短路故障将对系统和负载的正常运行带来严重影响,如何快速限制短路电流的问题亟待解决。此外,短路故障造成邻近线路电能质量问题也日渐凸显,这将严重影响计算机等敏感负荷的正常工作,给国民经济带来不可估量的损失。常规故障限流装置使用频率低,采取措施提高限流装置利用率同时改善系统电能质量,已成为国内外的研究热点之一。因此本文提出一种新型电能质量调节与故障限流复合系统(hybrid-controller for power quality and fault current,HPQFC),在分析其工作原理基础上,提出系统控制策略,并将系统应用于笼型异步机(squirrel-cage induction generators,SCIG)风电场短路故障穿越。本文比较了各类固态限流器的特点,提出了HPQFC拓扑结构和工作机理,阐述了PWM稳压模块、串联变流器、滤波器和固态限流器单元,分析了系统电能质量治理和短路限流工作原理。本文还对HPQFC故障检测方法进行了研究,通过比较常规基于dq变换的单相故障电压检测算法,提出了基于dq变换求导的故障电压检测算法,描述了线路电流瞬时值和电流变化率与积分的短路电流故障检测方法。针对10k V电网小电流接地系统,分析了不同接地方式下不同短路类型故障特征,研究了电能质量调节控制策略。不接地系统中提出了电网电压前馈以及负载电压外环和电容电流内环双闭环复合控制策略;中性点经消弧线圈接地系统由于消弧线圈作用,考虑耦合变压器饱和影响和直流电容电压波动等因素,提出了改进的双闭环复合控制策略。小电流接地系统中短路故障暂态特征类似,提出了相同的故障限流控制策略。最后,本文分析了SCIG风电场短路故障暂态过程,对比传统故障穿越方法,建立了接入HPQFC的SCIG风电场模型。分析了短路故障过程中和故障消除后HPQFC的工作模式和控制策略,并通过仿真验证了HPQFC故障穿越方法的有效性和优越性。
[Abstract]:With the increase of power load, the level of short circuit in power network is increasing, and the short circuit fault will seriously affect the normal operation of the system and load. The problem of how to limit the short circuit current quickly is urgently needed to be solved. In addition, the problem of power quality of adjacent lines caused by short-circuit fault is becoming increasingly prominent, which will seriously affect the normal operation of sensitive loads such as computers and bring incalculable losses to the national economy. The frequency of conventional fault current limiter is low, and it has become one of the research hotspots at home and abroad to take measures to improve the utilization ratio of current limiter and improve the power quality of the system. In this paper, a new type of power quality regulation and fault current limiting system (hybrid-controller for power quality and fault current,HPQFC) is proposed. Based on the analysis of its working principle, the control strategy of the system is put forward. The system is applied to the short circuit fault traversing of cage asynchronous machine (squirrel-cage induction generators,SCIG) wind farm. In this paper, the characteristics of various solid-state current limiter are compared, and the topology and working mechanism of HPQFC are presented. The PWM voltage stabilizing module, series converter, filter and solid-state current limiter unit are described. The power quality control and short circuit current limiting principle of the system are analyzed. The HPQFC fault detection method is also studied in this paper. By comparing the conventional single-phase fault voltage detection algorithm based on dq transform, a fault voltage detection algorithm based on dq transform is proposed. The fault detection method of short circuit current based on instantaneous value of line current, rate of change of current and integral is described. According to the low current grounding system of 10kV power network, the fault characteristics of different short-circuit types under different grounding modes are analyzed, and the control strategy of power quality regulation is studied. In the ungrounded system, the compound control strategy of voltage feedforward, load voltage outer loop and capacitive current inner loop is proposed. Due to the effect of arc-suppression coil, considering the influence of coupling transformer saturation and DC capacitor voltage fluctuation, an improved double-closed loop compound control strategy is proposed for the neutral point grounding system through arc-suppression coil. The transient characteristics of short circuit faults in small current grounding systems are similar, and the same fault current limiting control strategy is proposed. Finally, the transient process of short circuit fault in SCIG wind farm is analyzed. Compared with the traditional fault traversing method, the SCIG wind farm model connected to HPQFC is established. The operation mode and control strategy of HPQFC in short circuit fault process and after fault elimination are analyzed, and the effectiveness and superiority of HPQFC fault crossing method are verified by simulation.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM614;TM732
本文编号：2331784
[Abstract]:With the increase of power load, the level of short circuit in power network is increasing, and the short circuit fault will seriously affect the normal operation of the system and load. The problem of how to limit the short circuit current quickly is urgently needed to be solved. In addition, the problem of power quality of adjacent lines caused by short-circuit fault is becoming increasingly prominent, which will seriously affect the normal operation of sensitive loads such as computers and bring incalculable losses to the national economy. The frequency of conventional fault current limiter is low, and it has become one of the research hotspots at home and abroad to take measures to improve the utilization ratio of current limiter and improve the power quality of the system. In this paper, a new type of power quality regulation and fault current limiting system (hybrid-controller for power quality and fault current,HPQFC) is proposed. Based on the analysis of its working principle, the control strategy of the system is put forward. The system is applied to the short circuit fault traversing of cage asynchronous machine (squirrel-cage induction generators,SCIG) wind farm. In this paper, the characteristics of various solid-state current limiter are compared, and the topology and working mechanism of HPQFC are presented. The PWM voltage stabilizing module, series converter, filter and solid-state current limiter unit are described. The power quality control and short circuit current limiting principle of the system are analyzed. The HPQFC fault detection method is also studied in this paper. By comparing the conventional single-phase fault voltage detection algorithm based on dq transform, a fault voltage detection algorithm based on dq transform is proposed. The fault detection method of short circuit current based on instantaneous value of line current, rate of change of current and integral is described. According to the low current grounding system of 10kV power network, the fault characteristics of different short-circuit types under different grounding modes are analyzed, and the control strategy of power quality regulation is studied. In the ungrounded system, the compound control strategy of voltage feedforward, load voltage outer loop and capacitive current inner loop is proposed. Due to the effect of arc-suppression coil, considering the influence of coupling transformer saturation and DC capacitor voltage fluctuation, an improved double-closed loop compound control strategy is proposed for the neutral point grounding system through arc-suppression coil. The transient characteristics of short circuit faults in small current grounding systems are similar, and the same fault current limiting control strategy is proposed. Finally, the transient process of short circuit fault in SCIG wind farm is analyzed. Compared with the traditional fault traversing method, the SCIG wind farm model connected to HPQFC is established. The operation mode and control strategy of HPQFC in short circuit fault process and after fault elimination are analyzed, and the effectiveness and superiority of HPQFC fault crossing method are verified by simulation.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM614;TM732
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