电网故障条件下电压跌落评估及其应用
发布时间：2019-05-27 01:50
【摘要】：进行全面、准确和详细的电力系统电压跌落评估是分析系统电压跌落发生情况,制定相应的改善与治理方案的前提和依据,也是进一步分析电压跌落对电网供电可靠性影响的重要基础。本文以具有任意复杂拓扑结构的电网中各种类型的短路和接地故障导致的电压跌落问题为主要研究对象,从所关注节点故障电压的计算、系统中线路保护及重合闸装置动作特性对电压跌落持续时间的影响、以降低网络电压跌落频次为目标的分布式电源优化接入方案选择以及考虑电压跌落的电网供电可靠性等效分析等方面进行了深入研究。 针对传统电压跌落评估算法中通常仅关注电压跌落幅度和电压跌落发生的频次,而忽略电压跌落另一个重要参量——电压跌落持续时间的问题,提出了一种考虑线路保护和重合闸动作特性的计及持续时间的电网节点电压跌落评估算法。在具有任意复杂拓扑结构的电网中,当线路上发生短路或接地故障时,可给出网络中任意所关注节点的故障电压表达式。通过计算故障点与其他节点的互阻抗和故障点的白阻抗可以扩展原有节点阻抗矩阵且计及故障电阻,以此为基础可以将任意节点的故障电压写成与故障点位置和故障电阻有关的函数。结合电网中各条线路保护(过流保护、距离保护和差动保护等)的保护范围和动作时限,进行保护动作线路单端跳闸时的故障电压计算,结合系统中各种故障发生的频率和线路上故障概率的分布情况,进行各个节点的带电压跌落持续时间的电压跌落评估。提出的带持续时间的评估算法充分考虑了电压跌落幅值和持续时间两个主要参量,评估结果更为准确、全面,实用性更高。在IEEE-57节点标准测试系统中的仿真验证了该方法的正确性和有效性。 当目标电网有分布式电源接入需求时,提出了一种基于遗传算法的分布式电源优化接入配置算法。以减少电压跌落频次为目标,基于遗传算法优化配置分布式电源的接入位置,使得电网中所有节点电压跌落的总频次或者某些特定敏感负荷连接点的电压跌落总频次数量降低。该算法根据所需接入分布式电源数量、参数和原有系统情况,确定合理的接入向量编码方式,由优化目标和约束条件建立相应的目标函数和惩罚函数,利用遗传算法的全局寻优特性求取针对电压跌落问题的分布式电源最优接入方案。仿真结果表明分布式电源的接入能够在各种故障条件下使各节点的电压跌落频次一定程度上降低,进而使得系统总电压跌落频次降低。但从优化后的节点接入虽不能保证每个节点的电压跌落频次降低均达到最低,能实现系统总电压跌落频次降低幅度最大。仿真结果验证了该优化接入算法的有效性。 传统电网可靠性评估主要反映供电部门为电力客户提供持续不间断电力供应的能力,而对持续时间仅几个周波或几秒钟的电压跌落造成的供电电压波动对用户的影响未加考虑。本文提出了一种电压跌落情况下判断负荷停运和基于电压跌落经济损失等效停电时长的电网供电可靠性等效分析方法。将电压跌落对用户的影响纳入到系统供电可靠性等效分析评估的体系中。首先利用所提出的带持续时间的电压跌落评估算法对目标系统进行分析,给出各节点电压跌落的幅度、持续时间和频次等关键参量。对用户负荷设备进行分类,确定每种负荷设备的容量及数量,根据负荷设备的电压敏感性程度确定用户负荷的加权因子、容量系数、数量系数和重要程度系数,结合原始设备电压敏感曲线合成用户和节点的电压综合敏感曲线,进而建立用户和节点的负荷停运判别概率函数。利用电压跌落评估结果,判断负荷停运情况。最后根据负荷停运经济损失和用户单位停电时间内的经济损失计算出等效停电时长,得出考虑电压跌落影响的电网供电可靠性等效分析指标。基于电压跌落经济损失等效停电时长的供电可靠性评估是对现有供电可靠性等效分析体系的重要补充,为电压敏感用户提供高品质供电服务打下基础。在IEEE-14节点系统中的仿真结果表明了该方法的可行性。
[Abstract]:The comprehensive, accurate and detailed voltage drop evaluation of the power system is the premise and basis for analyzing the voltage drop of the system, and also the important foundation for further analyzing the influence of the voltage drop on the power supply reliability of the power grid. In this paper, the voltage drop problem caused by various types of short-circuit and ground faults in a power grid with any complex topological structure is the main research object, and the influence of the operation characteristics of the line protection and the reclosing device on the voltage drop duration is obtained from the calculation of the fault voltage of the node concerned. In order to reduce the network voltage drop frequency, the selection of the distributed power supply optimized access scheme and the equivalent analysis of the power supply reliability of the power grid considering the voltage drop are deeply studied. In the traditional voltage drop evaluation algorithm, only the voltage drop amplitude and the frequency of the voltage drop occur, and the other important parameter _ voltage drop duration of the voltage drop is ignored In this paper, a power grid node voltage drop evaluation method considering the time duration of line protection and reclosure action is proposed. method. In a power grid with any complex topological structure, when a short circuit or a ground fault occurs on the line, the fault voltage expression of any node of interest in the network can be given by calculating the mutual impedance of the fault point and other nodes and the white impedance of the fault point, the original node impedance matrix can be extended and the fault resistance can be taken into account, the fault voltage of any node can be written into a function related to the fault point position and the fault resistance based on the fault voltage, The number. In combination with the protection range and operation time limit of each line protection (overcurrent protection, distance protection and differential protection, etc.) in the power grid, the fault voltage calculation in the single-end tripping of the protective action line shall be carried out, and the frequency of various faults in the system and the distribution of the fault probability on the line shall be combined. The voltage drop evaluation of the voltage drop duration for each node is performed. It is estimated that the evaluation algorithm with time duration takes fully into account the two main parameters of voltage drop amplitude and duration, and the evaluation result is more accurate, comprehensive and practical. High. The simulation in the IEEE-57 node standard test system verifies the correctness and effectiveness of the method This paper presents a genetic algorithm-based distributed power optimization access distribution when the target power grid has a distributed power access requirement. The method is to reduce the voltage drop frequency as the target, and the access position of the distributed power source is optimized based on the genetic algorithm, so that the total frequency of all node voltage drops in the power grid or the total frequency of the voltage drop of some specific sensitive load connection points the method determines a reasonable access vector coding mode according to the quantity, the parameter and the original system condition of the required access distributed power supply, establishes a corresponding target function and a constraint condition by the optimization target and the constraint condition, A penalty function is used to obtain the optimal connection of distributed power supply for voltage drop problem by using the global optimization of genetic algorithm The simulation results show that the access of the distributed power source can lower the voltage drop frequency of each node under various fault conditions, so that the total voltage drop frequency of the system can be reduced. the reduction of the voltage drop frequency of each node can not be ensured from the optimized node access, so that the total voltage drop frequency of the system can be reduced, And the simulation result verifies the optimized access algorithm. Effectiveness. The traditional power grid reliability evaluation mainly reflects the ability of the power supply department to provide continuous uninterrupted power supply for the power customers, and the power supply voltage fluctuation caused by the voltage drop of only a few cycles or a few seconds for the duration of the duration is the shadow of the user In this paper, a voltage drop condition is presented to judge the load outage and the power supply reliability of the power grid based on the equivalent power failure duration of the voltage drop loss. Effect analysis method. The effect of voltage drop on the user is included in the equivalent analysis and evaluation of system power supply reliability In the system of estimation, the target system is analyzed by using the proposed voltage drop evaluation method with time duration, and the amplitude, duration and frequency of voltage drop of each node are given. the user load equipment is classified, the capacity and the quantity of each load device are determined, a weighting factor, a capacity coefficient, a quantity coefficient and a weight of the user load are determined according to the voltage sensitivity degree of the load equipment, to the degree coefficient, the voltage comprehensive sensitivity curve of the user and the node is synthesized in combination with the voltage sensitive curve of the original equipment, so that the load stop judgment of the user and the node is established Don't be a probability function. Use the voltage drop assessment to determine the negative In the end, according to the economic loss of the load and the economic loss in the power cut time of the user, the equivalent power failure duration is calculated, and the power supply reliability of the power grid considering the influence of the voltage drop is obtained. The power supply reliability evaluation based on the equivalent power failure duration of the voltage drop economic loss is an important supplement to the existing power supply reliability equivalent analysis system, and provides high-quality power supply for the voltage-sensitive users. The results of the IEEE-14 node system show that the party
【学位授予单位】：武汉大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TM714.2
本文编号：2485809
[Abstract]:The comprehensive, accurate and detailed voltage drop evaluation of the power system is the premise and basis for analyzing the voltage drop of the system, and also the important foundation for further analyzing the influence of the voltage drop on the power supply reliability of the power grid. In this paper, the voltage drop problem caused by various types of short-circuit and ground faults in a power grid with any complex topological structure is the main research object, and the influence of the operation characteristics of the line protection and the reclosing device on the voltage drop duration is obtained from the calculation of the fault voltage of the node concerned. In order to reduce the network voltage drop frequency, the selection of the distributed power supply optimized access scheme and the equivalent analysis of the power supply reliability of the power grid considering the voltage drop are deeply studied. In the traditional voltage drop evaluation algorithm, only the voltage drop amplitude and the frequency of the voltage drop occur, and the other important parameter _ voltage drop duration of the voltage drop is ignored In this paper, a power grid node voltage drop evaluation method considering the time duration of line protection and reclosure action is proposed. method. In a power grid with any complex topological structure, when a short circuit or a ground fault occurs on the line, the fault voltage expression of any node of interest in the network can be given by calculating the mutual impedance of the fault point and other nodes and the white impedance of the fault point, the original node impedance matrix can be extended and the fault resistance can be taken into account, the fault voltage of any node can be written into a function related to the fault point position and the fault resistance based on the fault voltage, The number. In combination with the protection range and operation time limit of each line protection (overcurrent protection, distance protection and differential protection, etc.) in the power grid, the fault voltage calculation in the single-end tripping of the protective action line shall be carried out, and the frequency of various faults in the system and the distribution of the fault probability on the line shall be combined. The voltage drop evaluation of the voltage drop duration for each node is performed. It is estimated that the evaluation algorithm with time duration takes fully into account the two main parameters of voltage drop amplitude and duration, and the evaluation result is more accurate, comprehensive and practical. High. The simulation in the IEEE-57 node standard test system verifies the correctness and effectiveness of the method This paper presents a genetic algorithm-based distributed power optimization access distribution when the target power grid has a distributed power access requirement. The method is to reduce the voltage drop frequency as the target, and the access position of the distributed power source is optimized based on the genetic algorithm, so that the total frequency of all node voltage drops in the power grid or the total frequency of the voltage drop of some specific sensitive load connection points the method determines a reasonable access vector coding mode according to the quantity, the parameter and the original system condition of the required access distributed power supply, establishes a corresponding target function and a constraint condition by the optimization target and the constraint condition, A penalty function is used to obtain the optimal connection of distributed power supply for voltage drop problem by using the global optimization of genetic algorithm The simulation results show that the access of the distributed power source can lower the voltage drop frequency of each node under various fault conditions, so that the total voltage drop frequency of the system can be reduced. the reduction of the voltage drop frequency of each node can not be ensured from the optimized node access, so that the total voltage drop frequency of the system can be reduced, And the simulation result verifies the optimized access algorithm. Effectiveness. The traditional power grid reliability evaluation mainly reflects the ability of the power supply department to provide continuous uninterrupted power supply for the power customers, and the power supply voltage fluctuation caused by the voltage drop of only a few cycles or a few seconds for the duration of the duration is the shadow of the user In this paper, a voltage drop condition is presented to judge the load outage and the power supply reliability of the power grid based on the equivalent power failure duration of the voltage drop loss. Effect analysis method. The effect of voltage drop on the user is included in the equivalent analysis and evaluation of system power supply reliability In the system of estimation, the target system is analyzed by using the proposed voltage drop evaluation method with time duration, and the amplitude, duration and frequency of voltage drop of each node are given. the user load equipment is classified, the capacity and the quantity of each load device are determined, a weighting factor, a capacity coefficient, a quantity coefficient and a weight of the user load are determined according to the voltage sensitivity degree of the load equipment, to the degree coefficient, the voltage comprehensive sensitivity curve of the user and the node is synthesized in combination with the voltage sensitive curve of the original equipment, so that the load stop judgment of the user and the node is established Don't be a probability function. Use the voltage drop assessment to determine the negative In the end, according to the economic loss of the load and the economic loss in the power cut time of the user, the equivalent power failure duration is calculated, and the power supply reliability of the power grid considering the influence of the voltage drop is obtained. The power supply reliability evaluation based on the equivalent power failure duration of the voltage drop economic loss is an important supplement to the existing power supply reliability equivalent analysis system, and provides high-quality power supply for the voltage-sensitive users. The results of the IEEE-14 node system show that the party
【学位授予单位】：武汉大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：TM714.2
【参考文献】
中国期刊全文数据库 前10条
1 韩英铎,严干贵,姜齐荣,黄民聪;信息电力与FACTS及DFACTS技术[J];电力系统自动化;2000年19期
2 张鹏,郭永基;电压骤降的可靠性评估新方法[J];电力系统自动化;2002年08期
3 丁明,王敏;分布式发电技术[J];电力自动化设备;2004年07期
4 雷宪章,D.Retzmann,M.Weinhold;利用电能质量调节器改善配电网络的电能质量[J];电网技术;2000年08期
5 李妍,余欣梅,熊信艮,段献忠;电力系统电压暂降分析计算方法综述[J];电网技术;2004年14期
6 肖先勇;王希宝;薛丽丽;刘波;杨洪耕;;敏感负荷电压凹陷敏感度的随机估计方法[J];电网技术;2007年22期
7 肖湘宁,徐永海,刘连光;考虑相位跳变的电压凹陷动态补偿控制器研究[J];中国电机工程学报;2002年01期
8 王克星,宋政湘,陈德桂,王建华,耿英三;基于小波变换的配电网电压暂降的干扰源辨识[J];中国电机工程学报;2003年06期
9 王宾,潘贞存,徐文远;配电系统电压跌落幅值估算分析[J];中国电机工程学报;2005年13期
10 陶顺,肖湘宁,刘晓娟;电压暂降对配电系统可靠性影响及其评估指标的研究[J];中国电机工程学报;2005年21期
中国硕士学位论文全文数据库 前4条
1 倪伟;计及电压骤降的配网可靠性评估[D];华北电力大学（北京）;2003年
2 陶顺;电压暂降对配电系统可靠性影响及其评估指标的研究[D];华北电力大学（北京）;2005年
3 尹元;计及电压暂降的配电网可靠性的模拟算法及实现[D];华北电力大学（北京）;2005年
4 肖玉龙;电压暂降检测及其补偿方法的研究[D];天津大学;2006年
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